阅读说明：本技术 一种组合镗床及镗孔加工方法 (Combined boring machine and boring processing method ) 是由 林智敏 洪培英 丁革新 吴宝霖 于 2020-07-16 设计创作，主要内容包括：本发明公开一种组合镗床及镗孔加工方法,包括底座、至少两个刀杆和夹紧定位装置,至少两个所述刀杆平行间隔设置并可自转和同时沿着刀杆轴向运动；所述底座上设置有用于安装固定待加工基座的夹紧定位装置；每一所述刀杆上可拆卸固定安装有第一镗刀和第二镗刀；所述待加工基座的第一导向段外侧设有用于安装第一镗刀的第一安装空间,所述待加工基座的第二导向段外侧设有用于安装第二镗刀的第二安装空间。与现有技术相比,本发明通过设置第一镗刀和第二镗刀分别从导向孔两端对第一导向段和第二导向段进行镗孔加工,无需转动待加工基座,保证了导向孔之间的平行度和同一导向孔内的第一导向段和第二导向段的同轴度。(The invention discloses a combined boring machine and a boring processing method, which comprise a base, at least two cutter bars and a clamping and positioning device, wherein the at least two cutter bars are arranged in parallel at intervals and can rotate and move axially along the cutter bars simultaneously; the base is provided with a clamping and positioning device for installing and fixing a base to be processed; each cutter bar is detachably and fixedly provided with a first boring cutter and a second boring cutter; and a first mounting space for mounting a first boring cutter is arranged on the outer side of the first guide section of the base to be processed, and a second mounting space for mounting a second boring cutter is arranged on the outer side of the second guide section of the base to be processed. Compared with the prior art, the first guide section and the second guide section are respectively bored from two ends of the guide hole by arranging the first boring cutter and the second boring cutter, a base to be machined does not need to be rotated, and the parallelism between the guide holes and the coaxiality of the first guide section and the second guide section in the same guide hole are ensured.)

1. The combined boring machine is characterized by comprising a base, at least two cutter bars and a clamping and positioning device, wherein the at least two cutter bars are arranged in parallel at intervals and can rotate and move along the axial direction of the cutter bars simultaneously; the base is provided with a clamping and positioning device for installing and fixing a base to be processed; each cutter bar is detachably and fixedly provided with a first boring cutter and a second boring cutter; and a first mounting space for mounting a first boring cutter is arranged on the outer side of the first guide section of the base to be processed, and a second mounting space for mounting a second boring cutter is arranged on the outer side of the second guide section of the base to be processed.

2. The combined boring machine as claimed in claim 1, wherein the base is fixedly provided with a first guide frame and a second guide frame respectively arranged at two ends of the guide hole, and the clamping and positioning device is arranged on the base between the first guide frame and the second guide frame; the first guide frame is provided with first support holes corresponding to the cutter bars one by one, and the second guide frame is provided with second support holes corresponding to the cutter bars one by one; each cutter bar can rotate and slide in the first support hole and the second support hole along the axial direction; the first installation space is arranged between the first guide frame and the base to be processed, and the second installation space is arranged between the second guide frame and the base to be processed.

3. The boring machine as claimed in claim 2, wherein a lubricating bushing is provided in each of said first and second support holes.

4. The combined boring machine as claimed in claim 1 or 2, wherein the number of said cutter bars is four.

5. The combined boring machine as claimed in claim 1, wherein the base is provided with a headstock for mounting the tool bar, the headstock being capable of rotating and moving the tool bar axially along the tool bar.

6. The gang boring machine of claim 5, wherein the tool bar is rotatably coupled to the headstock; the spindle box is arranged on the base in a sliding mode along the axis direction of the cutter bar.

7. The combined boring machine as claimed in claim 6, wherein the headstock is provided with first drive assemblies in one-to-one correspondence with the cutter bars, the first drive assemblies including first drive motors and reducers, the first drive motors being connected to input ends of the reducers, output ends of the reducers being connected to the cutter bars.

8. The combined boring machine as claimed in claim 6, wherein a slide carriage is mounted to the bottom of the headstock, a slide rail is provided on the base, the headstock is slidably connected to the slide rail by the slide carriage, and a second driving assembly for driving the headstock to move along the slide rail is provided between the headstock and the base.

9. The modular boring machine of claim 8 wherein the second drive assembly includes a lead screw rotatably coupled to the base and a traveling nut fixedly disposed on the headstock and coupled to the lead screw.

10. The combined boring machine as claimed in claim 1, wherein each of said cutter bars is provided with a first mounting hole for mounting a first boring cutter and a second mounting hole for mounting a second boring cutter.

Technical Field

The invention relates to the field of boring machines, in particular to a combined boring machine and a boring processing method.

Background

The stone processing equipment usually comprises a base for installing guide posts, wherein four guide holes 200 with parallel axes are arranged on the base, and each guide hole 200 comprises a first guide section 210, a second guide section 220 and a non-guide section 230 which is positioned between the first guide section 210 and the second guide section 220 and is not in contact with the guide posts. Since a plurality of guide posts are to slide in the guide holes 200 at the same time, the parallelism between the guide holes 200 and the coaxiality of the first guide section 210 and the second guide section 220 are required to be high.

The conventional processing technology is that a boring machine processes one guide hole 200 at a time, and after the first guide hole 200 is processed by the boring machine, the base 100 to be processed needs to be turned 180 degrees to process the second guide section 220. It is difficult to ensure the coaxiality of the first guide section 210 and the second guide section 220 and the parallelism between the guide holes 200.

In view of the above, the applicant has made an intensive study on the above-mentioned defects in the prior art, and has made this invention.

Disclosure of Invention

The invention mainly aims to provide a combined boring machine and a boring method, which have the characteristic of improving the precision of boring on a base.

In order to achieve the above purpose, the solution of the invention is:

a combined boring machine comprises a base, at least two cutter bars and a clamping and positioning device, wherein the at least two cutter bars are arranged in parallel at intervals and can rotate and move axially along the cutter bars simultaneously; the base is provided with a clamping and positioning device for installing and fixing a base to be processed; each cutter bar is detachably and fixedly provided with a first boring cutter and a second boring cutter; and a first mounting space for mounting a first boring cutter is arranged on the outer side of the first guide section of the base to be processed, and a second mounting space for mounting a second boring cutter is arranged on the outer side of the second guide section of the base to be processed.

Furthermore, a first guide frame and a second guide frame which are respectively arranged at two ends of the guide hole are fixedly arranged on the base, and the clamping and positioning device is arranged on the base between the first guide frame and the second guide frame; the first guide frame is provided with first support holes corresponding to the cutter bars one by one, and the second guide frame is provided with second support holes corresponding to the cutter bars one by one; each cutter bar can rotate and slide in the first support hole and the second support hole along the axial direction; the first installation space is arranged between the first guide frame and the base to be processed, and the second installation space is arranged between the second guide frame and the base to be processed.

Furthermore, each first supporting hole and each second supporting hole are internally provided with a lubricating shaft sleeve.

Further, the number of the cutter bars is four.

Furthermore, a spindle box used for installing the cutter bar is arranged on the base, and the spindle box can drive the cutter bar to rotate and move axially along the cutter bar.

Further, the cutter bar is rotationally connected to the spindle box; the spindle box is arranged on the base in a sliding mode along the axis direction of the cutter bar.

Further, be provided with on the headstock with the first drive assembly of cutter arbor one-to-one, first drive assembly includes first driving motor and speed reducer, first driving motor with the input of speed reducer is connected, the output of speed reducer with the cutter arbor is connected.

Further, a sliding seat is installed at the bottom of the spindle box, a sliding rail is arranged on the base, the spindle box is connected to the sliding rail in a sliding mode through the sliding seat, and a second driving assembly for driving the spindle box to move along the sliding rail is arranged between the spindle box and the base.

Furthermore, the second driving assembly comprises a screw rod which is rotatably connected to the base and a movable nut which is fixedly arranged on the spindle box and connected with the screw rod.

Furthermore, each cutter bar is provided with a first mounting hole for mounting a first boring cutter and a second mounting hole for mounting a second boring cutter.

Further, the clamping and positioning device comprises a reference seat and a clamping mechanism; the base is fixedly arranged on the base, and the clamping mechanism is connected to the base; the base to be machined is placed on the upper surface of the reference seat, and the clamping mechanism is clamped on the base to be machined from top to bottom.

Further, the clamping mechanism comprises a fixed supporting seat, a pressing plate, a pressing bolt and an adjusting nut, the fixed supporting seat is connected to the reference seat, and two ends of the pressing plate are respectively arranged on the fixed supporting seat and the base to be processed; and a pressing bolt penetrates through the middle part of the pressing plate, the lower end of the pressing bolt is connected with the reference seat, and the adjusting nut is in threaded connection with the pressing bolt and abuts against the upper surface of the pressing plate.

Furthermore, the clamping and positioning device also comprises a first adjusting and abutting mechanism and a second adjusting and abutting mechanism;

the first adjusting abutting mechanism comprises a first abutting seat and a first abutting mechanism; the first abutting base is arranged on the reference base; the first abutting mechanism and the first abutting base respectively abut against two side end faces of the base to be processed in the axial direction of the guide hole;

the second adjusting abutting mechanism comprises a second abutting seat and a second abutting mechanism which are arranged on the reference seat; the second abutting mechanism and the second abutting base respectively abut against two side end faces of the base to be processed, wherein the side end faces are perpendicular to the axial direction of the guide hole.

Further, the second abutting seat is provided with an abutting rod, and the abutting head of the abutting rod and the base to be processed is in a spherical crown shape.

Further, the first abutting mechanism and the second abutting mechanism respectively comprise a fixed mounting seat, an adjusting screw rod, an abutting head and an adjusting hand wheel; the adjusting screw is in threaded connection with the fixed mounting seat, the head of the adjusting screw is provided with a ball head, and the abutting head is provided with a ball socket connected with the ball head; an adjusting hand wheel is arranged at the tail part of the adjusting screw rod; the axes of the adjusting screws of the first abutting mechanism and the second abutting mechanism are horizontally arranged and are vertical to each other.

Further, the reference base comprises a first base and a second base which are arranged on the base along the axial direction of the guide hole of the base to be processed, and the upper surface of the first base is lower than the upper surface of the second base; the second abutting seat and the second abutting mechanism are installed on the upper surface of the first base.

Further, the fixed mounting seat of the first abutting mechanism is fixedly arranged on the second guide frame.

A boring processing method comprises the following steps:

firstly, clamping and positioning a base to be machined, and simultaneously penetrating at least two cutter bars arranged in parallel through corresponding guide holes of the base to be machined;

secondly, a first boring cutter is arranged on the cutter bar close to the first guide section, and the cutter bar rotates to bore the first guide section of the guide hole; after the machining is finished, the cutter bar is withdrawn in the opposite direction, and the first boring cutter is detached;

mounting a second boring cutter on the cutter bar close to the second guide section, and boring the second guide section of the guide hole by rotating the cutter bar; after the machining is finished, the cutter bar is withdrawn in the opposite direction, and the second boring cutter is detached;

and fourthly, taking down the base to be processed from the guide hole of the base to be processed by the cutter bar.

Further, a first guide frame and a second guide frame are arranged at two ends of a guide hole of the base to be processed; the first guide frame is provided with first support holes corresponding to the cutter bars one by one, and the second guide frame is provided with second support holes corresponding to the cutter bars one by one; each cutter bar can rotate and slide in the first support hole and the second support hole along the axial direction; before the first guide section is machined, the first boring cutter is installed on the cutter bar in a first installation space, and the first boring cutter is taken down in the first installation space after boring machining; before the second guide section is machined and the second guide section is machined, the second boring cutter is installed on the cutter bar in the second installation space, and the second boring cutter is taken down in the second installation space after boring machining.

After adopting the structure, the combined boring machine and the boring processing method have the following beneficial effects that:

the method comprises the following steps that firstly, a base to be machined is fixed on a base through a clamping and positioning device, a first boring cutter is installed on a cutter bar, and the cutter bar rotates to bore a hole to machine a first guide hole; and after the first guide hole is machined, the cutter bar drives the first boring cutter to withdraw, and the first boring cutter is detached. When a second guide hole is machined, a second boring cutter is arranged on the cutter bar on the outer side of the second guide hole, and the cutter bar rotates to bore a hole to machine the second guide hole; after the second guide hole is machined, the cutter bar drives the second boring cutter to withdraw, and the second boring cutter is detached;

because at least two cutter bars are arranged in parallel at intervals and synchronously move along the direction of the cutter bars, the parallelism between the processed guide holes is ensured; the first guide section and the second guide section in the same guide hole are formed by processing the same cutter bar, and the base to be processed does not need to be rotated, so that the coaxiality of the first guide section and the second guide section is ensured.

Two, through setting up first leading truck and second leading truck, each the cutter arbor rotates simultaneously and sliding connection is in when the bore hole is processed in first supporting hole and the second supporting hole, has reduced the deformation that the cutter arbor bore hole was processed man-hour, is favorable to improving the precision of processing.

Compared with the prior art, the first guide section and the second guide section are respectively bored from two ends of the guide hole by arranging the first boring cutter and the second boring cutter, a base to be machined does not need to be rotated, and the parallelism between the guide holes and the coaxiality of the first guide section and the second guide section in the same guide hole are ensured.

Drawings

Fig. 1 is a schematic cross-sectional view of a pilot hole of a base to be processed.

Fig. 2 is a schematic front view of the present invention.

Fig. 3 is a schematic perspective view of the present invention.

Fig. 4 is a schematic perspective view of another embodiment of the present invention.

Fig. 5 and 6 are schematic perspective views of the headstock and the tool bar.

Fig. 7 is an enlarged schematic view of a portion a in fig. 6.

Fig. 8 and 9 are schematic perspective views of the base mounted on the base.

Fig. 10 is an enlarged schematic view of the structure at B in fig. 9.

Fig. 11 is a schematic cross-sectional view of the tightening mechanism.

Fig. 12 is an enlarged schematic view of the structure at C in fig. 11.

In the figure:

a base 100 to be processed; a guide hole 200; a first guide section 210; a second guide section 220; a non-guiding section 230;

a base 1; a slide rail 11; a cutter bar 2; a first mounting hole 21; a second mounting hole 22; a clamping and positioning device 3; a reference base 31; a first base 311; a second base 312; a clamping mechanism 32; a fixed support seat 321; a pressure plate 322; a hold-down bolt 323; an adjusting nut 324; a first abutting base 33; a second abutting base 34; the abutting rod 341; a fixed mount 351; an adjusting screw 352; abutting against the head 353; an adjusting handwheel 354;

a first guide frame 41; the first support hole 411; a second guide frame 42; the second support hole 421; a lubricating bushing 412; a filler port 413; the first installation space 43; the second installation space 44;

a main spindle box 5; a first drive assembly 51; a first drive motor 511; a speed reducer 512; a transmission belt 513; a second drive assembly 52; a screw rod 521; the traveling nut 522; a slide 53.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

As shown in fig. 1 to 5, the combined boring machine according to the present invention comprises a base 1, at least two cutter bars 2 and a clamping and positioning device 3, wherein the at least two cutter bars 2 are arranged in parallel at intervals and can rotate and move axially along the cutter bars 2; the base 1 is provided with a clamping and positioning device 3 for installing and fixing a base 100 to be processed; a first boring cutter (not shown in the figure) and a second boring cutter (not shown in the figure) are detachably and fixedly arranged on each cutter bar 2; a first installation space 43 for installing a first boring cutter is arranged outside the first guide section 210 of the base 100 to be processed, and a second installation space 44 for installing a second boring cutter is arranged outside the second guide section 220 of the base 100 to be processed.

Thus, the invention relates to a combined boring machine and a boring method, a base 100 to be processed is fixed on a base 1 through a clamping and positioning device 3, a first boring cutter is arranged on a cutter bar 2, and the cutter bar 2 rotates to bore to process a first guide hole 200; after the first guide hole 200 is machined, the cutter bar 2 drives the first boring cutter to withdraw, and the first boring cutter is detached. When the second guide hole 200 is machined, a second boring cutter is arranged on the cutter bar 2 outside the second guide hole 200, and the cutter bar 2 rotates to bore to machine the second guide hole 200; after the second guide hole 200 is machined, the cutter bar 2 drives the second boring cutter to withdraw, and the second boring cutter is detached.

Because at least two cutter bars 2 are arranged in parallel at intervals and synchronously move along the direction of the cutter bars 2, the parallelism between the processed guide holes 200 is ensured; the first guide section 210 and the second guide section 220 in the same guide hole 200 are processed by the same tool bar 2, and the base 100 to be processed does not need to be rotated, so that the coaxiality of the first guide section 210 and the second guide section 220 is ensured.

Preferably, a first guide frame 41 and a second guide frame 42 respectively arranged at two ends of the guide hole 200 are fixedly arranged on the base 1, and the clamping and positioning device 3 is arranged on the base 1 between the first guide frame 41 and the second guide frame 42; the first guide frame 41 is provided with first support holes 411 corresponding to the cutter bars 2 one to one, and the second guide frame 42 is provided with second support holes 421 corresponding to the cutter bars 2 one to one; each of the tool bars 2 can rotate and slide in the axial direction in the first and second supporting holes 411 and 421; the first installation space 43 is provided between the first guide frame 41 and the base to be processed 100, and the second installation space 44 is provided between the second guide frame 42 and the base to be processed 100. Through setting up first leading truck 41 and second leading truck 42, each cutter arbor 2 rotates simultaneously and sliding connection when boring processing in first support hole 411 and second support hole 421, has reduced the deformation that cutter arbor 2 bored processing was processed, is favorable to improving the precision of processing.

Preferably, a lubricating bushing 412 is disposed in each of the first supporting hole 411 and the second supporting hole 421. The wear of the tool shank 2 in rotation and sliding is reduced by the provision of the lubricating bushing 412. Furthermore, the first guide frame 41 and the second guide frame 42 are provided with a filling port 413 for adding lubricating oil.

Preferably, the number of said knife bars 2 is four. The number of the guide holes 200 on the base 100 to be processed is four, which are arranged at four corners of the base 100 to be processed. The cutter bars 2 are correspondingly arranged in parallel and correspond to the guide holes 200 on the base 100 to be processed in one-to-one correspondence.

Preferably, a spindle box 5 for installing the cutter bar 2 is arranged on the base 1, and the spindle box 5 can drive the cutter bar 2 to rotate and move axially along the cutter bar 2. The spindle box 5 is used for installing the cutter bar 2 and can drive the cutter bar 2 to rotate.

Preferably, the cutter bar 2 is rotatably connected to the main spindle box 5; the spindle box 5 is slidably disposed on the base 1 along the axial direction of the tool bar 2. Thus, the tool bar 2 moves in the longitudinal direction as the headstock 5 moves.

Preferably, the spindle box 5 is provided with first driving assemblies 51 corresponding to the cutter bars 2 one to one, each first driving assembly 51 includes a first driving motor 511 and a speed reducer 512, the first driving motor 511 is connected with an input end of the speed reducer 512, and an output end of the speed reducer 512 is connected with the cutter bars 2. The power of the first driving motor 511 is transmitted to the cutter bar 2 through the speed reducer 512, thereby driving the cutter bar 2 to rotate. Each of the knife bars 2 is provided with a group of first driving assemblies 51. Furthermore, the output end of the speed reducer 513 is connected with the cutter bar 2 through a transmission belt 513.

Preferably, a sliding seat 53 is installed at the bottom of the spindle box 5, a sliding rail 11 is arranged on the base 1, the spindle box 5 is slidably connected to the sliding rail 11 through the sliding seat 53, and a second driving assembly 52 for driving the spindle box 5 to move along the sliding rail 11 is arranged between the spindle box 5 and the base 1. Preferably, the second driving assembly 52 comprises a screw 521 rotatably connected to the base 1 and a moving nut 522 fixedly disposed on the spindle box 5 and connected to the screw 521. Along with the rotation of the screw 521, the moving nut 522 drives the main spindle box 5 to move along the slide rail 11.

Preferably, each of the tool bars 2 is provided with a first mounting hole 21 for mounting a first boring tool and a second mounting hole 22 for mounting a second boring tool. The first boring tool and the second boring tool are mounted to the tool holder 2 through the first mounting hole 21 and the second mounting hole 22, but the boring tools may be mounted in other mounting manners.

Preferably, the clamping and positioning device 3 comprises a reference seat 31 and a clamping mechanism 32; the reference seat 31 is fixedly arranged on the base 1, and the clamping mechanism 32 is connected to the reference seat 31; the base 100 to be processed is placed on the upper surface of the reference seat 31, and the clamping mechanism 32 is clamped on the base 100 to be processed from top to bottom. The datum seat 31 is used for realizing positioning in the height direction, and the clamping mechanism 32 is used for clamping and fixing the base 100 to be processed.

Preferably, the clamping mechanism 32 includes a fixed support base 321, a pressure plate 322, a pressing bolt 323 and an adjusting nut 324, the fixed support base 321 is connected to the reference base 31, and two ends of the pressure plate 322 are respectively disposed on the fixed support base 321 and the base 100 to be processed; a pressing bolt 323 penetrates through the middle of the pressing plate 322, the lower end of the pressing bolt 323 is connected with the reference base 31, and the adjusting nut 324 is in threaded connection with the pressing bolt 323 and abuts against the upper surface of the pressing plate 322. Thus, with the locking of the adjusting nut 324, since one end of the pressing plate 322 abuts against the fixed support seat 321, the other end of the pressing plate 322 can press the base 100 to be processed.

Preferably, the clamping and positioning device 3 further comprises a first adjusting and abutting mechanism and a second adjusting and abutting mechanism; the first adjusting abutting mechanism and the second adjusting abutting mechanism are used for positioning and fixing the base 100 to be processed in the horizontal direction.

The first adjusting abutting mechanism comprises a first abutting seat 33 and a first abutting mechanism; the first abutting base 33 is arranged on the reference base 31; the first abutting mechanism and the first abutting base 33 abut against two side end faces of the base 100 to be processed in the axial direction of the guide hole 200 respectively;

the second adjusting abutting mechanism comprises a second abutting seat 34 and a second abutting mechanism which are arranged on the reference seat 31; the second abutting mechanism and the second abutting base 34 abut against two side end faces of the base 100 to be processed, which are perpendicular to the axial direction of the guide hole 200, respectively.

Preferably, the second abutting base 34 is provided with an abutting rod 341, and the head of the abutting rod 341 abutting against the base 100 to be processed is a spherical crown shape. The first abutting base 33 has an abutting surface abutting against the base 100 to be processed, and the second abutting base 34 abuts against the base 100 to be processed through the spherical crown-shaped head, so that the position of the base 100 to be processed in the horizontal direction can be better determined.

Preferably, the first abutting mechanism and the second abutting mechanism both comprise a fixed mounting seat 351, an adjusting screw 352, an abutting head 353 and an adjusting hand wheel 354; the adjusting screw 352 is in threaded connection with the fixed mounting seat 351, a ball head is arranged at the head of the adjusting screw 352, and a ball socket connected with the ball head is arranged on the abutting head 353; an adjusting handwheel 354 is arranged at the tail part of the adjusting screw 352; the axes of the adjusting screws 352 of the first and second tightening mechanisms are horizontally arranged and perpendicular to each other. The adjusting hand wheel 354 is rotated to drive the screw to rotate, so that the abutting head 353 abuts against the base 100 to be processed, and the abutting head 353 and the head of the screw can be adjusted through a ball head and a ball socket, so that the abutting head 353 can adapt to the surface of the base 100 to be processed to abut against and be fixed. Further, the fixed mounting seat 351 of the first abutting mechanism is fixedly arranged on the second guide frame 42.

Preferably, the reference seat 31 includes a first seat 311 and a second seat 312 which are arranged on the base 1 along the axial direction of the guide hole 200 of the base 100 to be processed, and the upper surface of the first seat 311 is lower than the upper surface of the second seat 312; the second abutting base 34 and the second abutting mechanism are mounted on the upper surface of the first base 311. The first abutting base 33 is disposed on an upper surface of the first base 311. The second abutting base 34 and the second abutting mechanism are also disposed on the upper surface of the first base 311.

The invention also provides a boring processing method, which comprises the following steps:

firstly, clamping and positioning a base 100 to be processed, and simultaneously enabling at least two cutter bars 2 arranged in parallel to penetrate through corresponding guide holes 200 of the base 100 to be processed;

secondly, a first boring cutter is arranged on the cutter bar 2 close to the first guide section 210, and the cutter bar 2 rotates to bore the first guide section 210 of the guide hole 200; after the machining is finished, the cutter bar 2 is withdrawn in the opposite direction, and the first boring cutter is detached;

thirdly, a second boring cutter is arranged on the cutter bar 2 close to the second guide section 220, and the cutter bar 2 rotates to bore the second guide section 220 of the guide hole 200; after the machining is finished, the cutter bar 2 is withdrawn in the opposite direction, and the second boring cutter is detached;

and fourthly, the cutter bar 2 takes down the base 100 to be processed from the guide hole 200 of the base 100 to be processed.

The first guide section 210 and the second guide section 220 are respectively bored by the first boring cutter and the second boring cutter detachably fixed on the cutter bar 2, the base 100 to be machined does not need to be moved, and the parallelism between the guide holes 200 and the coaxiality of the first guide section 210 and the second guide section 220 in the same guide hole 200 are ensured.

Preferably, the first guide frame 41 and the second guide frame 42 are arranged at two ends of the guide hole 200 of the base 100 to be processed; the first guide frame 41 is provided with first support holes 411 corresponding to the cutter bars 2 one to one, and the second guide frame 42 is provided with second support holes 421 corresponding to the cutter bars 2 one to one; each of the tool bars 2 can rotate and slide in the axial direction in the first and second supporting holes 411 and 421; before the first guide section 210 is machined, the first boring tool is mounted on the tool bar 2 in the first mounting space 43, and the first boring tool is removed from the first mounting space 43 after boring; before the second guide section 220 is machined and before the second guide section 220 is machined, the second boring tool is mounted on the tool holder 2 in the second mounting space 44, and the second boring tool is removed from the second mounting space 44 after the boring process. The first supporting hole 411 and the second supporting hole 421 reduce deformation of the boring tool bar 2 during machining, and are favorable for improving machining precision.

Compared with the prior art, the first guide section 210 and the second guide section 220 are bored from the two ends of the guide hole 200 by arranging the first boring cutter and the second boring cutter respectively, the base 100 to be machined does not need to be rotated, and the parallelism between the guide holes 200 and the coaxiality of the first guide section 210 and the second guide section 220 in the same guide hole 200 are ensured.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.