阅读说明：本技术 深孔扩镗加工装置及其加工方法 (Deep hole expanding and boring machining device and machining method thereof ) 是由 李增勋 王明月 田树珍 云雯 李婷 王艳超 杨凯林 张贺清 刘庆君 付志琦 张立 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种深孔扩镗加工装置,包括：粗镗刀具、精镗刀具,粗镗刀具包括：粗镗本体、导向体,多个导向体活动连接在粗镗本体的外壁上；精镗刀具包括：刀体和刀具,刀体包括：精镗本体、橡皮键、键固定螺钉。本发明还公开了一种深孔扩镗加工方法,包括：将粗镗刀具安装在镗刀杆上,利用粗镗刀具对零件内孔进行镗削加工；将精镗刀具与镗刀杆连接,利用精镗刀体配合浮动镗削刀片对内孔进行推镗、拉镗加工,完成内孔精加工。本发明通过粗镗刀具、精镗刀具组合使用,通过支撑部件支撑、导向作用,减弱刀体振动,能够高效、稳定、高精度进行深孔镗削,并提高镗削刀具的使用寿命。(The invention discloses a deep hole boring device, which comprises: the heavy boring cutter, the fine boring cutter, the heavy boring cutter includes: the heavy boring machine comprises a heavy boring body and a plurality of guide bodies, wherein the plurality of guide bodies are movably connected to the outer wall of the heavy boring body; the finish boring cutter includes: cutter body and cutter, the cutter body includes: fine boring body, rubber key, key fixing screw. The invention also discloses a deep hole expanding and boring processing method, which comprises the following steps: mounting a rough boring cutter on a boring cutter rod, and boring an inner hole of the part by using the rough boring cutter; and connecting the fine boring cutter with the boring cutter bar, and performing push boring and pull boring on the inner hole by using the fine boring cutter body and the floating boring blade to finish the fine machining of the inner hole. The invention weakens the vibration of the cutter body by using the combination of the rough boring cutter and the fine boring cutter and supporting and guiding functions of the supporting part, can carry out deep hole boring with high efficiency, stability and high precision, and prolongs the service life of the boring cutter.)

1. Deep hole bores processingequipment, its characterized in that includes: the heavy boring cutter, the fine boring cutter, the heavy boring cutter includes: the heavy boring machine comprises a heavy boring body and a plurality of guide bodies, wherein the plurality of guide bodies are movably connected to the outer wall of the heavy boring body; the front end of the rough boring body is provided with a boring cutter fixing end and an aligning end, and the aligning end is positioned on the outer side of the boring cutter fixing end; the rear end of the rough boring body is provided with a connecting end, and the outer wall of the connecting end is provided with connecting threads; a boring cutter fixing through hole is longitudinally formed in the boring cutter fixing end, a boring cutter head is clamped in the boring cutter fixing through hole, a cutter head fixing threaded hole is formed in the outer wall of the boring cutter fixing through hole, a cutter head fixing bolt is mounted in the cutter head fixing threaded hole, and the boring cutter head is fixed in the boring cutter fixing through hole through the cutter head fixing bolt; the rough boring body is provided with an oil way, one opening of the oil way is positioned at the center of the end part of the connecting end, and the other opening is positioned at the front end part of the rough boring body; the finish boring cutter includes: cutter body and cutter, the cutter body includes: the fine boring machine comprises a fine boring body, a rubber key and a key fixing screw, wherein a cutter body connecting end is arranged at the front end of the fine boring body, a cutter rod connecting end is arranged at the rear end of the fine boring body, a cutter rod connecting thread is arranged on the outer wall of the cutter rod connecting end, and the fixed rubber key is connected to the outer wall of the fine boring body; the cutter body connecting end is longitudinally provided with a cutter fixing through hole, the end part of the cutter body connecting end is provided with a cutter fixing threaded hole communicated with the cutter fixing through hole, a cutter fixing screw is arranged on the cutter fixing threaded hole, and a cutter is clamped in the cutter fixing through hole and fixed by the cutter fixing screw; the fine boring body is provided with a cooling channel, one opening of the cooling channel is positioned on the front end face of the fine boring body, and the other opening of the cooling channel is positioned on the end face of the cutter bar connecting end.

2. The deep hole boring machining device of claim 1, characterized in that a plurality of guide grooves are arranged on the outer wall of the heavy boring body, and a guide body threaded counter bore is arranged in each guide groove; the guide body is provided with a guide body through hole, a guide body fixing screw penetrates through the guide body through hole to be connected in the guide body thread counter bore, the guide body is fixed in the guide groove, and the guide body fixing screw for fixing the guide body is sleeved with the elastic pad.

3. The deep hole boring device according to claim 1, wherein the boring cutter fixing end is longitudinally provided with two boring cutter fixing through holes which are a rough boring square hole and a fine boring square hole respectively, and the rough boring square hole is positioned outside the fine boring square hole; the boring cutter head includes: the boring tool comprises a rough boring tool bit and a fine boring tool bit, wherein the rough boring square hole is clamped with the rough boring tool bit, and the fine boring square hole is clamped with the fine boring tool bit.

4. The deep hole boring machining device according to claim 1, characterized in that key mounting planes are symmetrically arranged on the outer wall of the fine boring body up and down, and key fixing threaded holes are formed in the key mounting planes; the outer wall of the rubber key is an arc-shaped surface, a fixing through hole is longitudinally formed in the outer wall of the rubber key, a key connecting sheet is arranged at the lower part of the rubber key, the key connecting sheet is U-shaped, two end parts of the key connecting sheet are upwards connected into the rubber key, the key connecting sheet is provided with a key fixing through hole and a rubber key connecting through hole, the key fixing through hole is positioned at the lower part of the fixing through hole, and the rubber key connecting through hole is embedded into the rubber key; the key fixing screw penetrates through the fixing through hole to be connected to the key fixing threaded hole, and the rubber key is connected to the key mounting plane.

5. The deep hole boring machining device according to claim 1, wherein an alignment counter bore is provided to an outer end surface of the plus end, the cutter body attachment end is provided with an alignment hole and a cutter fixing threaded hole, the alignment hole and the cutter fixing threaded hole are concentrically provided, the alignment hole is located on an outer side, and the cutter fixing threaded hole is located on an inner side.

6. The deep hole boring machining device according to claim 1, wherein the cutter comprises: the fine boring cutter comprises a fine boring cutter body, a floating boring blade, a blade connecting screw and a blade positioning screw; the fine boring cutter body is longitudinally provided with a blade mounting groove in the middle, a blade connecting through hole is arranged on the front wall surface, the blade connecting through hole is a step-shaped long through hole, and the upper part of the fine boring cutter body is provided with a blade positioning opening; the side wall of the floating boring blade is provided with a blade connecting threaded hole, the top of the floating boring blade is provided with an adjusting block, and the adjusting block is longitudinally provided with a blade positioning threaded hole; the floating boring blade is arranged in the blade mounting groove, the adjusting block is arranged in the blade positioning opening, the blade connecting screw penetrates through the blade connecting through hole to be connected to the blade connecting threaded hole, and the blade positioning screw is arranged in the blade positioning threaded hole.

7. The deep hole boring machining device according to claim 1, wherein the end of the cooling passage is provided with two cooling passage branches, and the openings of the two cooling passage branches are located on both sides of the opening of the tool holding through hole, respectively.

8. The deep hole expanding and boring machining method comprises the following steps:

mounting a rough boring cutter on a boring cutter rod, and boring an inner hole of the part by using the rough boring cutter;

and connecting the fine boring cutter with the boring cutter bar, and performing push boring and pull boring on the inner hole by using the fine boring cutter body and the floating boring blade to finish the fine machining of the inner hole.

9. The deep hole boring method of claim 8, wherein the step of boring the inner hole of the part by using the rough boring tool comprises:

preliminarily mounting a rough boring cutter head in a rough boring square hole, mounting a fine boring cutter head in a fine boring square hole, preliminarily fixing the rough boring cutter head and the fine boring cutter head by utilizing a cutter head fixing bolt, and connecting a connecting end with a boring cutter rod by utilizing threads;

positioning and connecting the tool setting device and the aligning counter bore of the outer end face of the aligning end, determining rough machining cutting machining amount, adjusting the extending amount of a rough boring tool bit and a fine boring tool bit by using a digital dial indicator on the tool setting device, and locking by using a tool bit fixing bolt after adjustment is finished;

the part is clamped on a machine tool, the rough boring cutter enters an inner hole of the part along with the boring cutter rod, the cooling medium enters the connecting end and the oil path from the boring cutter rod, when the rough boring cutter head starts cutting, the cooling medium is sprayed to the tool nose of the rough boring cutter head and the fine boring cutter head from the opening of the oil path, and the inner hole is bored by the rough boring cutter head and the fine boring cutter head under the guiding and supporting action of the guide body.

10. The deep hole boring machining method of claim 8, wherein the push boring and pull boring machining process comprises:

installing a floating boring pushing blade on the side part of a fine boring cutter body, and primarily fixing the floating boring pushing blade by using a blade connecting screw and a blade positioning screw; after the finish machining cutting machining amount is determined, a fine boring cutter body and a floating push boring blade are locked by a blade connecting screw and a blade positioning screw;

connecting a cutter bar connecting end with a boring cutter bar, positioning and connecting a tool setting device with a aligning hole, adjusting the radial lengths of a fine boring cutter body and a floating boring pushing blade by using a digital dial indicator on the tool setting device, determining the radial lengths according to boring machining amount, and locking the floating boring pushing blade by using a blade connecting screw and a blade positioning screw;

the floating push boring blade and the boring cutter bar are sent into an inner hole for push boring processing, and after the push boring processing is finished, the floating push boring blade and the boring cutter bar are withdrawn from the inner hole;

replacing the floating boring cutter blade, installing the floating boring cutter blade on the side part of the fine boring cutter body, and primarily fixing the floating boring cutter blade by using a cutter blade connecting screw and a cutter blade positioning screw; after the finish machining cutting machining amount is determined, a fine boring cutter body and a floating boring blade are locked by a blade connecting screw and a blade positioning screw;

and feeding the floating boring blade and the boring cutter bar into the inner hole for boring, wherein the inner hole of the part is bored by using the fine boring cutter body and the floating boring blade in the retreating process of the boring cutter bar.

Technical Field

The invention belongs to a deep hole boring processing technology, and particularly relates to a deep hole expanding and boring processing device and a processing method thereof.

Background

In the deep hole machining process, an operator cannot directly observe the cutting process, and meanwhile, the machining accuracy is required to be high, so that the machining difficulty is very high. Because the processing quality of the deep hole of the part is closely related to the design precision, the service life and the like of the product, the requirements on the aspects of dimensional tolerance, bending degree, roughness and the like of the deep hole of the processed part are extremely high.

However, in the deep hole boring process, the distribution of cutting force is not uniform, which easily causes deviation of the tool machining track, and the tool is easily vibrated, which causes severe abrasion when the boring tool is machined, and the boring efficiency is low and the machining precision is not easy to be guaranteed.

Disclosure of Invention

The invention aims to provide a deep hole expanding and boring processing device and a processing method thereof.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

deep hole bores processingequipment, includes: the heavy boring cutter, the fine boring cutter, the heavy boring cutter includes: the heavy boring machine comprises a heavy boring body and a plurality of guide bodies, wherein the plurality of guide bodies are movably connected to the outer wall of the heavy boring body; the front end of the rough boring body is provided with a boring cutter fixing end and an aligning end, and the aligning end is positioned on the outer side of the boring cutter fixing end; the rear end of the rough boring body is provided with a connecting end, and the outer wall of the connecting end is provided with connecting threads; a boring cutter fixing through hole is longitudinally formed in the boring cutter fixing end, a boring cutter head is clamped in the boring cutter fixing through hole, a cutter head fixing threaded hole is formed in the outer wall of the boring cutter fixing through hole, a cutter head fixing bolt is mounted in the cutter head fixing threaded hole, and the boring cutter head is fixed in the boring cutter fixing through hole through the cutter head fixing bolt; the rough boring body is provided with an oil way, one opening of the oil way is positioned at the center of the end part of the connecting end, and the other opening is positioned at the front end part of the rough boring body; the finish boring cutter includes: cutter body and cutter, the cutter body includes: the fine boring machine comprises a fine boring body, a rubber key and a key fixing screw, wherein a cutter body connecting end is arranged at the front end of the fine boring body, a cutter rod connecting end is arranged at the rear end of the fine boring body, a cutter rod connecting thread is arranged on the outer wall of the cutter rod connecting end, and the fixed rubber key is connected to the outer wall of the fine boring body; the cutter body connecting end is longitudinally provided with a cutter fixing through hole, the end part of the cutter body connecting end is provided with a cutter fixing threaded hole communicated with the cutter fixing through hole, a cutter fixing screw is arranged on the cutter fixing threaded hole, and a cutter is clamped in the cutter fixing through hole and fixed by the cutter fixing screw; the fine boring body is provided with a cooling channel, one opening of the cooling channel is positioned on the front end face of the fine boring body, and the other opening of the cooling channel is positioned on the end face of the cutter bar connecting end.

Further, a plurality of guide grooves are formed in the outer wall of the rough boring body, and guide body threaded counter bores are formed in the guide grooves; the guide body is provided with a guide body through hole, a guide body fixing screw penetrates through the guide body through hole to be connected in the guide body thread counter bore, the guide body is fixed in the guide groove, and the guide body fixing screw for fixing the guide body is sleeved with the elastic pad.

Further, two boring cutter fixing through holes are longitudinally formed in the boring cutter fixing end and respectively comprise a rough boring square hole and a fine boring square hole, and the rough boring square hole is positioned on the outer side of the fine boring square hole; the boring cutter head includes: the boring tool comprises a rough boring tool bit and a fine boring tool bit, wherein the rough boring square hole is clamped with the rough boring tool bit, and the fine boring square hole is clamped with the fine boring tool bit.

Further, key mounting planes are symmetrically arranged on the upper and lower sides of the outer wall of the fine boring body, and key fixing threaded holes are formed in the key mounting planes; the outer wall of the rubber key is an arc-shaped surface, a fixing through hole is longitudinally formed in the outer wall of the rubber key, a key connecting sheet is arranged at the lower part of the rubber key, the key connecting sheet is U-shaped, two end parts of the key connecting sheet are upwards connected into the rubber key, the key connecting sheet is provided with a key fixing through hole and a rubber key connecting through hole, the key fixing through hole is positioned at the lower part of the fixing through hole, and the rubber key connecting through hole is embedded into the rubber key; the key fixing screw penetrates through the fixing through hole to be connected to the key fixing threaded hole, and the rubber key is connected to the key mounting plane.

Furthermore, an alignment counter bore is formed in the outer end face of the alignment end, an alignment hole and a cutter fixing threaded hole are formed in the cutter body connecting end, the alignment hole and the cutter fixing threaded hole are concentrically arranged, the alignment hole is located on the outer side, and the cutter fixing threaded hole is located on the inner side.

Further, the cutter comprises: the fine boring cutter comprises a fine boring cutter body, a floating boring blade, a blade connecting screw and a blade positioning screw; the fine boring cutter body is longitudinally provided with a blade mounting groove in the middle, a blade connecting through hole is arranged on the front wall surface, the blade connecting through hole is a step-shaped long through hole, and the upper part of the fine boring cutter body is provided with a blade positioning opening; the side wall of the floating boring blade is provided with a blade connecting threaded hole, the top of the floating boring blade is provided with an adjusting block, and the adjusting block is longitudinally provided with a blade positioning threaded hole; the floating boring blade is arranged in the blade mounting groove, the adjusting block is arranged in the blade positioning opening, the blade connecting screw penetrates through the blade connecting through hole to be connected to the blade connecting threaded hole, and the blade positioning screw is arranged in the blade positioning threaded hole.

Furthermore, the tail end of the cooling channel is provided with two cooling channel branches, and the openings of the two cooling channel branches are respectively positioned on two sides of the opening of the cutter fixing through hole.

The deep hole expanding and boring machining method comprises the following steps:

mounting a rough boring cutter on a boring cutter rod, and boring an inner hole of the part by using the rough boring cutter;

and connecting the fine boring cutter with the boring cutter bar, and performing push boring and pull boring on the inner hole by using the fine boring cutter body and the floating boring blade to finish the fine machining of the inner hole.

Preferably, the step of boring the inner hole of the part by using the rough boring cutter comprises:

preliminarily mounting a rough boring cutter head in a rough boring square hole, mounting a fine boring cutter head in a fine boring square hole, preliminarily fixing the rough boring cutter head and the fine boring cutter head by utilizing a cutter head fixing bolt, and connecting a connecting end with a boring cutter rod by utilizing threads;

positioning and connecting the tool setting device and the aligning counter bore of the outer end face of the aligning end, determining rough machining cutting machining amount, adjusting the extending amount of a rough boring tool bit and a fine boring tool bit by using a digital dial indicator on the tool setting device, and locking by using a tool bit fixing bolt after adjustment is finished;

the part is clamped on a machine tool, the rough boring cutter enters an inner hole of the part along with the boring cutter rod, the cooling medium enters the connecting end and the oil path from the boring cutter rod, when the rough boring cutter head starts cutting, the cooling medium is sprayed to the tool nose of the rough boring cutter head and the fine boring cutter head from the opening of the oil path, and the inner hole is bored by the rough boring cutter head and the fine boring cutter head under the guiding and supporting action of the guide body.

Preferably, the push boring and pull boring process comprises the following steps:

installing a floating boring pushing blade on the side part of a fine boring cutter body, and primarily fixing the floating boring pushing blade by using a blade connecting screw and a blade positioning screw; after the finish machining cutting machining amount is determined, a fine boring cutter body and a floating push boring blade are locked by a blade connecting screw and a blade positioning screw;

connecting a cutter bar connecting end with a boring cutter bar, positioning and connecting a tool setting device with a aligning hole, adjusting the radial lengths of a fine boring cutter body and a floating boring pushing blade by using a digital dial indicator on the tool setting device, determining the radial lengths according to boring machining amount, and locking the floating boring pushing blade by using a blade connecting screw and a blade positioning screw;

the floating push boring blade and the boring cutter bar are sent into an inner hole for push boring processing, and after the push boring processing is finished, the floating push boring blade and the boring cutter bar are withdrawn from the inner hole;

replacing the floating boring cutter blade, installing the floating boring cutter blade on the side part of the fine boring cutter body, and primarily fixing the floating boring cutter blade by using a cutter blade connecting screw and a cutter blade positioning screw; after the finish machining cutting machining amount is determined, a fine boring cutter body and a floating boring blade are locked by a blade connecting screw and a blade positioning screw;

and feeding the floating boring blade and the boring cutter bar into the inner hole for boring, wherein the inner hole of the part is bored by using the fine boring cutter body and the floating boring blade in the retreating process of the boring cutter bar.

The invention has the technical effects that:

(1) the deep hole expanding and boring processing device and the processing method thereof are suitable for large-diameter deep hole boring processing, are suitable for deep hole processing of ultrahigh-strength ductile steel with high material hardness, poor cooling and lubricating conditions, large cutting force and large vibration, greatly improve the vibration damping performance, greatly improve the processing conditions of deep holes, and improve the processing precision and surface quality. The deep hole boring can be efficiently, stably and accurately carried out.

(2) The rough boring cutter and the fine boring cutter are combined to bore for machining, and rough boring and fine boring can be completed at one time, so that the deep hole boring machining efficiency and the machining precision are improved.

The rough boring cutter can be provided with a rough boring cutter head and a fine boring cutter head, and can finish rough boring and semi-fine boring processing at one time, so that the processing efficiency is improved.

The fine boring cutter completes the deep hole expanding boring processing together, and has the characteristics of stable boring, high processing precision and wide range.

(3) The angle and the specification of the cooling hole are improved, so that the cooling medium can be directly sprayed to the tool tip position of the tool, the tool is rapidly cooled, and the service life of the tool is prolonged.

The rough boring cutter and the fine boring cutter are both provided with cooling channels, and cooling media are directly sprayed to the blades through the inner holes (cooling channels) of the cutter body, so that a good lubricating effect is achieved, and the service life of the cutter is obviously prolonged.

(4) The supporting and guiding effects are achieved through the supporting and guiding component, the vibration of the cutter body is weakened, the deep hole machining precision is improved, and the service life of the cutter is prolonged.

The rough boring cutter adopts a plurality of guide bodies, and during cutting, the guide bodies can play a role in supporting and vibration prevention, play a role in supporting and guiding and weaken the vibration of the cutter body.

The fine boring cutter adopts a guide body structure (rubber keys) to play a role in supporting and guiding, and reduces the vibration of the cutter, so that a product can obtain higher dimensional precision, and the surface quality of an inner hole of the product is improved.

(5) The extension of the upper blade of the cutter can be freely adjusted, and the boring machining precision and the cutting amount are controlled.

(6) Will produce remarkable economic benefits, mainly expressed in the following aspects: firstly, can improve steel pipe production quality, improve the product percent of pass, reduce the waste product and reprocess the loss, reduce the loss of quality. And secondly, the deep hole machining efficiency of the steel pipe is improved, the equipment utilization rate is improved, and the production cost is reduced. And thirdly, the machining precision of the deep hole of the steel pipe is improved, the machining allowance of the body pipe blank is further reduced, the structure of the steel pipe blank is optimized, and the material consumption and the energy consumption of the blank are reduced.

Drawings

FIG. 1 is a schematic front view of the heavy boring tool of the present invention;

FIG. 2 is a top view of the heavy boring tool of the present invention;

FIG. 3 is a left side view of the rough boring tool of the present invention;

FIG. 4 is a cross-sectional view of the heavy bore body of the present invention.

FIG. 5 is a schematic structural view of a first guide body according to the present invention;

FIG. 6 is a top view of a first guide body of the present invention;

FIG. 7 is a schematic structural view of a fine boring tool according to the present invention;

FIG. 8 is a perspective view of a blade according to the present invention;

FIG. 9 is a front view of the cutter body of the present invention;

FIG. 10 is a longitudinal sectional view of a cutter body according to the present invention;

FIG. 11 is a front view of the fine bored body of the present invention;

FIG. 12 is a top view of the fine bored body of the present invention;

FIG. 13 is a left side view of the fine bored body of the present invention;

FIG. 14 is a longitudinal sectional view of a rubber key in the present invention;

FIG. 15 is a top view of the rubber key of the present invention;

FIG. 16 is a side view of the rubber key of the present invention;

FIG. 17 is a schematic view of the construction of the cutter according to the present invention;

FIG. 18 is a sectional view taken along line A-A of the cutter of the present invention;

FIG. 19 is a sectional view taken along line B-B of the cutter of the present invention;

FIG. 20 is a schematic structural view of a floating push-boring blade according to the present invention;

FIG. 21 is a cross-sectional view taken along line C-C of the floating push-boring blade of the present invention;

FIG. 22 is a top view of FIG. 20;

FIG. 23 is a schematic structural view of a floating boring blade according to the present invention;

FIG. 24 is a cross-sectional view taken along line D-D of the floating boring blade of the present invention;

FIG. 25 is a top view of FIG. 23 of the present invention.

Detailed Description

The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.

Deep hole bores processingequipment, its structure includes: the method comprises the following steps of firstly, boring an inner hole of a part by using the rough boring cutter, and after finishing rough boring, carrying out push boring and pull boring by using the fine boring cutter and a floating boring blade.

FIG. 1 is a schematic front view of the heavy boring tool of the present invention; FIG. 2 is a top view of the heavy boring tool of the present invention; fig. 3 is a left side view of the rough boring tool of the present invention.

A rough boring tool, comprising: the heavy boring machine comprises a heavy boring body 11 and a plurality of guide bodies 12, wherein the guide bodies 12 are movably connected to the outer wall of the heavy boring body 11.

The rough boring body 11 is made of 50Mn steel, a boring cutter fixing end 1101 and an alignment end 1102 are arranged at the front end, the alignment end 1102 is located on the outer side of the boring cutter fixing end 1101, and a connecting end 1103 is arranged at the rear end of the rough boring body 11.

A boring cutter fixing through hole is longitudinally formed in the boring cutter fixing end 1101 (the boring cutter fixing through hole is used for clamping the rough boring cutter head 13 or the fine boring cutter head 14 and comprises a rough boring square hole 1105 and a fine boring square hole 1104, the rough boring square hole 1105 is positioned on the outer side of the fine boring square hole 1104, the position of the rough boring square hole 1105 can be adjusted according to the actual use condition, the rough boring square hole 1105 is used for clamping the rough boring cutter head 13, and the fine boring square hole 1104 is used for clamping the fine boring cutter head 14); the outer walls of the rough-bored square hole 1105 and the fine-bored square hole 1104 are provided with a cutter head fixing threaded hole 1106, and a cutter head fixing bolt 1107 is installed in the cutter head fixing threaded hole 1106.

An alignment counterbore 1108 is provided to the outer end face of the positive terminal 1102.

The outer wall of the connecting end 1103 is provided with a connecting thread, the connecting thread adopts a three-head right-handed square thread, and the connecting end 1103 is used for connecting a boring cutter rod.

As shown in fig. 4, a sectional view of the rough boring body 11 in the present invention.

The rough boring body 11 is provided with an oil path 1109, one opening of the oil path 1109 is positioned at the end center position of the connecting end 1103, and the other opening is positioned at the front end part of the rough boring body 11 and is close to the positions of the fine boring cutter head 14 and the rough boring cutter head 13. The oil path 1109 is used for transmitting cooling media, so that the vulcanized oil is ensured to enter the oil path 1109 through the inner cavity of the boring cutter rod and then is sprayed to the fine boring cutter head 14 and the rough boring cutter head 13 through the oil path 1109, and the purpose of cooling the cutters is achieved.

The outer wall of the rough boring body 11 is provided with a plurality of guide grooves for mounting the guide body 12. A guide body threaded counter bore 1110 is arranged in the guide groove; the guide body 12 is provided with a guide body through hole 121, and a guide body fixing screw 122 passes through the guide body through hole 121 and is connected in the guide body threaded counter bore 1110 to fix the guide body 12 in the guide groove.

In the preferred embodiment, the plurality (three pairs) of guide grooves include: first guide way, second guide way, third guide way, a plurality of guide body 12 include: a first guide body 123, a second guide body 124, and a third guide body 125. A first guide body 123 is installed in the first guide groove, a second guide body 124 is installed in the second guide groove, and a third guide body 125 is installed in the third guide groove.

The first guide grooves are located at the front and bottom of the rough boring body 11, the third guide grooves are located at the top and rear of the rough boring body 11, and the second guide grooves are located at both sides of the third guide grooves at the top of the rough boring body 11.

The end surfaces of the first guide body 123, the second guide body 124 and the third guide body 125 are provided with reverse taper cambered surfaces, so that the inner wall of the hole can be prevented from being scratched when the cutter is withdrawn. The guide body fixing screw 122 for fixing the first guide body 123 is sleeved with the elastic pad 126, so that the height of the first guide body 123 can be automatically adjusted along with the boring hole diameter, the first guide body 123 can be more suitable for the inner wall of the boring hole, and the supporting and guiding effects can be better achieved.

Fig. 5 is a schematic structural view of the first guide body 123 according to the present invention; as shown in fig. 6, a plan view of the first guide body 123 according to the present invention is shown.

The first guide body 123 is provided with three guide body through holes 121 and a plurality of alloy supports 127 on the top surface to increase the wear resistance of the first guide body 123.

When in use, the rough boring cutter head 13 is preliminarily mounted in the rough boring square hole 1105 and the fine boring cutter head 14 is preliminarily mounted in the fine boring square hole 1104 by utilizing the cutter head fixing bolt 1107; connecting the connecting end 1103 with a boring bar by using threads; after the rough boring cutter and the boring cutter bar are installed, the tool setting device is connected with the aligning counter bore 1108 of the outer end face of the aligning end 1102 in a positioning mode, the digital dial indicators on the tool setting device are used for adjusting the extending amount of the rough boring cutter head 13 and the fine boring cutter head 14, the rough machining is enabled to finish 80% of the cutting machining amount, the fine machining is enabled to finish 20% of the cutting machining amount, and the cutter head fixing bolts 1107 are used for locking after the adjustment is finished.

The rough boring cutter enters the inner hole of the part to be machined along with the boring cutter rod, when the rough boring cutter head 13 starts to cut, the cooling medium vulcanized oil enters the connecting end 1103 and the oil way 1109 from the boring cutter rod, and then is sprayed to the tool nose of the rough boring cutter head 13 and the fine boring cutter head 14 through the opening of the oil way 1109 on the front end part of the rough boring body 11, so that the cooling purpose is achieved, an oil film is formed on the inner wall of the hole of the part along with the boring, the guiding effect of the guide body 12 is enhanced, and the requirement on the straightness of the inner hole of the part is met.

Fig. 7 is a schematic structural diagram of the fine boring tool of the invention.

The structure of the fine boring cutter comprises: cutter body 21 and cutter 22, cutter 22 swing joint is on cutter body 21.

Fig. 8 is a schematic perspective view of the cutter body 21 according to the present invention; as shown in fig. 9, is a front view of the cutter body 21 of the present invention; as shown in fig. 10, a cutter body 21 according to the present invention is a longitudinal sectional view.

The cutter body 21 includes: a fine boring body 211, a rubber key 212 and a key fixing screw 213.

The front end of the fine boring body 211 is provided with a cutter body connecting end 2111, the rear end is provided with a cutter bar connecting end 2112, and the fine boring body 211 is provided with a cooling channel 2113; the cutter body connecting end 2111 is longitudinally provided with a cutter fixing through hole 2114, the end part is provided with a cutter fixing threaded hole 2115 communicated with the cutter fixing through hole 2114, a cutter fixing screw is installed on the cutter fixing threaded hole 2115, and a cutter 22 is clamped in the cutter fixing through hole 2114 and fixed through the cutter fixing screw.

The outer wall of the cutter bar connecting end 2112 is provided with cutter bar connecting threads, the cutter bar connecting threads adopt three-head right-handed square-tooth threads, and the cutter bar connecting end 2112 is connected with a boring cutter bar through the cutter bar connecting threads. One opening of the cooling passage 2113 is located at the front end face of the fine boring body 211, and the other opening is located at the end face of the shank attachment end 2112.

As shown in fig. 11, is a front view of the fine boring body 211 in the present invention; as shown in fig. 12, is a top view of the fine boring body 211 in the present invention; as shown in fig. 13, is a left side view of the fine boring body 211 in the present invention.

The outer wall of the fine boring body 211 is provided with key mounting planes 2116 in an up-down symmetrical manner, the key mounting planes 2116 are provided with key fixing threaded holes, and the key fixing screws 213 are mounted on the key fixing threaded holes. In the preferred embodiment, each key mounting plane is provided with four key fixing threaded holes for mounting two rubber keys 212. The key set screw 213 is a hexagonal female screw.

In the preferred embodiment, the end of the cooling channel 2113 is provided with two cooling channel branches 2117, the openings of the two cooling channel branches 2117 being located on either side of the opening of the tool retention through hole 2114. To cool both ends of the tool 22.

In the preferred embodiment, the alignment hole 2118 and the tool fixing threaded hole 2115 are concentrically arranged, the alignment hole 2118 is located on the outer side, and the tool fixing threaded hole 2115 is located on the inner side, while alignment during installation and clamping of the tool 22 are considered.

In the present preferred embodiment, in order to effectively fix the rubber key 212, stoppers 2119 are provided at both ends of the key installation plane 2116. The baffle 2119 is the portion of the outer wall of the body 11 that remains when the key is mounted to the flat 116.

FIG. 14 is a longitudinal sectional view of the rubber key 212 of the present invention; FIG. 15 is a top view of the rubber key 212 of the present invention; as shown in fig. 16, a side view of the rubber key 212 of the present invention is shown.

The rubber key 212 is made of rubber, the outer wall of the rubber key is an arc-shaped surface, and a fixing through hole 2121 is longitudinally formed; the rubber key 212 is provided at a lower portion thereof with a key connecting piece 2122, the key connecting piece 2122 has a U-shaped configuration, both ends of which are upwardly connected to the inside of the rubber key 212, the key connecting piece 2122 is provided with a key fixing through hole 2123 and a rubber key connecting through hole 2124, the key fixing through hole 2123 is located at a lower portion of the fixing through hole 2121, and the rubber key connecting through hole 2124 is embedded in the rubber key 212. The key fixing screw 213 is coupled to the key fixing screw hole through the fixing through hole 2121 to couple the rubber key 212 to the key mounting plane 2116.

FIG. 17 is a schematic view of the structure of the cutter 22 according to the present invention; FIG. 18 is a sectional view taken along line A-A of a cutter 22 according to the present invention; FIG. 19 is a sectional view of the cutter 22 of the present invention taken along the line B-B.

The cutter 22 includes: the fine boring cutter body 221, the floating boring cutter blades (floating push boring blades and floating pull boring blades 222), the blade connecting screws 223 and the blade positioning screws 224 are combined and connected together by the fine boring cutter body 221 and the floating boring cutter blades through the blade connecting screws 223 and the blade positioning screws 224, and the positions of the cutter heads of the fine boring cutter body 221 and the floating boring cutter blades are opposite.

As shown in fig. 20, is a schematic structural view of the fine boring cutter body 221 of the present invention; as shown in fig. 21, a C-C sectional view of the fine boring tool body 221 of the present invention; fig. 22 is a plan view of fig. 20.

The fine boring cutter body 221 is longitudinally provided with a blade mounting groove 2211 in the middle, the front wall surface is provided with (three) blade connecting through holes 2212, the blade connecting through holes 2212 are step-shaped long through holes, so that the relative distance between the floating boring blade and the tool tip of the fine boring cutter body 221 can be conveniently adjusted, the radial length of the cutter 22 can be adjusted, and meanwhile, the screw head of the blade connecting screw 223 can be embedded in the blade connecting through hole 2212, and the clamping of the cutter 22 is facilitated.

The fine boring cutter body 221 is made of 50 materials, and a first alloy material 2213 (Kenna KU25 material hard alloy) is welded at the position of a lower cutter head to finish deep hole boring machining.

The fine boring cutter body 221 is provided with an insert positioning opening 2214 at the upper portion, and the insert positioning opening 2214 is used for being matched with installation of the floating boring insert.

The floating push boring blade and the floating pull boring blade 222 are similar in structure, the floating push boring blade is used for push boring machining of deep holes, and the floating pull boring blade 222 is used for pull boring machining of the deep holes; the pull boring process determines that the installation directions of the floating push boring blade and the floating pull boring blade 222 on the fine boring cutter body 221 are opposite. In the present invention, the floating boring blade 222 is taken as an example to further illustrate the structure and assembly of the tool 22.

FIG. 23 is a schematic view of the floating boring blade 222 according to the present invention; FIG. 24 is a cross-sectional view of the floating boring blade 222 of the present invention taken along line D-D; FIG. 25 is a top view of FIG. 23 of the present invention.

The floating boring blade 222 is provided with (three) blade connecting threaded holes 2221 on the side wall, an adjusting block 2222 on the top, a (two) blade positioning threaded hole 2223 longitudinally provided on the adjusting block 2222, a second alloy material 2224 on the top, and the second alloy material 2224 at the front end of the adjusting block 2222.

When the tool is assembled, the floating boring blade 222 is arranged on the side part of the fine boring tool body 221, the adjusting block 2222 is arranged in the blade positioning opening 2214, and the blade connecting screw 223 penetrates through the blade connecting through hole 2212 and is connected to the blade connecting threaded hole 2221; the insert positioning screw 224 is installed in the insert positioning threaded hole 2223, the relative distance between the tips of the fine boring cutter body 221 and the floating boring cutter piece 222 can be adjusted by adjusting the screwing-out length of the insert positioning screw 224, and the fine boring cutter body 221 and the floating boring cutter piece 222 can be combined into the cutter 22 by screwing the insert connecting screw 223 after the relative position is adjusted.

When in use, the rubber key 212 is arranged on the key installation plane 2116 of the body 211, the key fixing screw 213 passes through the fixing through hole 2121 and the key fixing through hole 2123 and is connected to the key fixing threaded hole of the key installation plane 2116, and the rubber key 212 is fixed by screwing the key fixing screw 213;

then assembling the cutter 22, adjusting the relative positions of the fine boring cutter body 221 and the floating boring blade 222 to enable the radial length of the cutter 22 to meet the requirement, installing the cutter 22 in a cutter fixing through hole 2114 of the fine boring body 211, installing a cutter fixing screw on a cutter fixing threaded hole 2115, screwing the cutter fixing screw, and preliminarily fixing the position of the cutter 22;

connecting the cutter bar connecting end 2112 with a boring cutter bar, positioning and connecting the cutter device with the aligning hole 118, adjusting the radial length of the cutter 22 by using a digital dial gauge on the cutter device, determining the radial length of the cutter 22 and further determining the boring processing amount;

the combined deep hole fine boring device enters an inner hole of a machined part along with a boring cutter rod, and the inner hole of the machined part is drawn and bored by using a fine boring cutter body 221 and a floating drawing and boring blade 222 in the retreating process. And the floating push boring blade, the floating pull boring blade 222 are replaced or the radial length of the cutter 22 is adjusted according to the process.

The deep hole expanding and boring machining method specifically comprises the following steps:

step 1: mounting a rough boring cutter on a boring cutter rod, and boring an inner hole of the part by using the rough boring cutter;

step 11: preliminarily mounting the rough boring cutter head 13 in the rough boring square hole 1105, preliminarily mounting the fine boring cutter head 14 in the fine boring square hole 1104, preliminarily fixing the rough boring cutter head 13 and the fine boring cutter head 14 by using a cutter head fixing bolt 1107, and connecting the connecting end 1103 with the boring cutter bar by using threads;

step 12: positioning and connecting the tool setting device and an alignment counter bore 1108 on the outer end face of the alignment end 1102, determining rough machining cutting machining amount, adjusting the extending amount of a rough boring tool bit 13 and a fine boring tool bit 14 by using a digital dial indicator on the tool setting device, and locking by using a tool bit fixing bolt 1107 after adjustment is finished;

step 13: the part is clamped on a machine tool, the rough boring cutter enters an inner hole of the part along with the boring cutter rod, the cooling medium enters the connecting end 1103 and the oil path 1109 from the boring cutter rod, when the rough boring cutter head 13 starts cutting, the cooling medium is sprayed to the tool tips of the rough boring cutter head 13 and the fine boring cutter head 14 from the opening of the oil path 1109, and the inner hole is bored by the rough boring cutter head 13 and the fine boring cutter head 14 under the guiding and supporting action of the guide body 12.

In the machining process, the guide body 12 can be outwards propped out and tightly propped against the inner wall of the inner hole, so that the supporting and guiding effects are achieved. Two heavy boring cutter heads 13 can also be used for boring the inner hole.

Step 2: and connecting the fine boring cutter with the boring cutter bar, and performing push boring and pull boring on the inner hole by using the fine boring cutter body and the floating boring blade to finish the fine machining of the inner hole.

In the part fine boring process, the floating boring blade is matched with the fine boring cutter body 221 to perform fine machining on an inner hole of the part, a machining method combining push boring and pull boring is adopted, the floating boring blade is mounted on the fine boring cutter body 221 to perform push boring machining, after the push boring is completed, the floating boring blade is taken down and replaced by the floating boring cutter 222 to perform pull boring machining, and in the inner hole fine machining process, the rubber key 212 in the middle of the fine boring cutter body 221 can also play a supporting role. The method has the advantages of stable cutting process, cutter abrasion reduction, high straightness accuracy of the inner hole of the machined part, large boring machining range and wide applicability.

Step 21: mounting the floating boring pushing blade on the side part of the fine boring cutter body 221, and primarily fixing the floating boring pushing blade by using a blade connecting screw 223 and a blade positioning screw 224; after the finish machining cutting machining amount is determined, a fine boring cutter body 221 and a floating push boring blade are locked by a blade connecting screw 223 and a blade positioning screw 224;

step 22: connecting a cutter bar connecting end 2112 with a boring cutter bar, positioning and connecting the cutter setting device with the aligning hole 118, adjusting the radial lengths of the fine boring cutter body 221 and the floating boring pushing blade by using a digital dial indicator on the cutter setting device, determining the radial length according to the boring machining amount, and locking the floating boring pushing blade by using a blade connecting screw 223 and a blade positioning screw 224;

step 23: the floating push boring blade and the boring cutter bar are sent into an inner hole for push boring processing, and after the push boring processing is finished, the floating push boring blade and the boring cutter bar are withdrawn from the inner hole;

step 24: replacing the floating boring cutter blade 222, installing the floating boring cutter blade 222 on the side part of the fine boring cutter body 221, and primarily fixing the floating boring cutter blade by using a cutter blade connecting screw 223 and a cutter blade positioning screw 224; after the finish machining cutting machining amount is determined, a fine boring cutter body 221 and a floating boring cutter blade 222 are locked by a cutter blade connecting screw 223 and a cutter blade positioning screw 224;

step 25: and (3) feeding the floating boring blade 222 and the boring cutter rod into the inner hole for boring, and boring the inner hole of the part by using the fine boring cutter body 221 and the floating boring blade 222 in the retreating process.

The invention processes the deep hole of the high-strength and high-toughness steel by the procedures of rough boring, semi-fine boring, fine boring and the like, improves the structure of the cutter body 21 and the cutter 22, the material of the cutter and the process procedures, realizes the boring processing of the high-strength and high-toughness steel, has the advantages of stable boring, high processing precision and wide range, and has good lubricating effect of the vulcanized oil, and the product can obtain higher dimensional precision. After the machining is finished, the machining precision of the inner hole reaches IT7 level, the full-length wall thickness difference is less than 1mm, the roundness is less than 0.05mm, the surface roughness reaches Ra1.6, the straightness is less than 0.1mm/m, and the service life of a rough boring cutter and a fine boring cutter and the surface quality of the inner hole can be obviously improved.

The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.