阅读说明：本技术 改善大型柴油机连杆深孔粗糙度的磨削加工方法及工装 (Grinding method and tool for improving roughness of deep hole of connecting rod of large diesel engine ) 是由 金朝兵 范红健 沈治东 张伟 郭祺 于 2021-06-16 设计创作，主要内容包括：一种改善大型柴油机连杆深孔粗糙度的磨削加工方法及工装,包括支撑导向部件、磨具、钻杆、接柄和两个V型铁；其中两个V型铁置放在龙门铣床上,连杆安置在该两个V型铁上,支撑导向部件连接于连杆上,用于支撑和定位钻杆,钻杆的一端通过接柄与龙门铣床的主轴连接,另一端与磨具连接,磨具和钻杆的一端穿过支撑导向部件,伸入至深孔内,并且导套、磨具、钻杆及接柄与深孔的轴心线和龙门铣床的X轴同轴；龙门铣床X轴的旋转和进给运动带动磨具,磨削加工深孔的孔壁,使加工后该深孔的粗糙度达到技术要求。本发明解决了连杆深孔粗糙度无法满足技术要求的问题。降低了劳动强度,提高了生产效率,改善了加工质量,能适用多种型号的大型柴油机连杆深孔的磨削加工。(A grinding method and a tool for improving the roughness of a deep hole of a connecting rod of a large diesel engine comprise a supporting guide part, a grinding tool, a drill rod, a connecting handle and two V-shaped irons; the two V-shaped irons are placed on the planer type milling machine, the connecting rod is arranged on the two V-shaped irons, the supporting and guiding component is connected to the connecting rod and used for supporting and positioning the drill rod, one end of the drill rod is connected with a main shaft of the planer type milling machine through the connecting handle, the other end of the drill rod is connected with the grinding tool, the grinding tool and one end of the drill rod penetrate through the supporting and guiding component and extend into the deep hole, and the guide sleeve, the grinding tool, the drill rod and the connecting handle are coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine; the rotation and feed motion of the X axis of the planer type milling machine drives the grinding tool to grind and process the hole wall of the deep hole, so that the roughness of the processed deep hole reaches the technical requirement. The invention solves the problem that the roughness of the deep hole of the connecting rod can not meet the technical requirement. The grinding machine has the advantages of reducing labor intensity, improving production efficiency, improving processing quality and being suitable for grinding deep holes of connecting rods of large diesel engines of various models.)

1. The utility model provides an improve grinding frock of large-scale diesel engine connecting rod deep hole roughness, installs on the planer-type milling machine, the axial lead of deep hole with the coincidence of the central line of connecting rod is equipped with the connection location screw on the terminal surface of this connecting rod thick end, its characterized in that: the grinding tool comprises a supporting guide component, a grinding tool, a drill rod, a connecting handle and two V-shaped irons;

the two V-shaped irons are placed on a lathe bed of the planer type milling machine, the connecting rod is fixedly arranged on the two V-shaped irons, and the axial lead of the deep hole is coaxial with the X axis of the planer type milling machine;

the supporting and guiding component is connected to the connecting rod and used for supporting and positioning the drill rod, the supporting and guiding component comprises a supporting rod, a positioning bolt and a guide sleeve, the guide sleeve is installed in a positioning center hole of the supporting rod, the supporting rod is installed on the end face of the thick end of the connecting rod through the positioning bolt, and the guide sleeve is coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine;

one end of the drill rod is connected with a main shaft of the planer type milling machine through the connecting handle, the other end of the drill rod is connected with the grinding tool through threads, and a central through hole through which cooling liquid passes is formed in the drill rod;

one end of the grinding tool and one end of the drill rod penetrate through the guide sleeve of the supporting and guiding component and extend into the deep hole, and the guide sleeve, the grinding tool, the drill rod and the connecting handle of the supporting and guiding component are coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine;

and driving the grinding tool through the rotation and feed motion of the X axis of the planer type milling machine to grind and process the hole wall of the deep hole, so that the roughness of the processed deep hole meets the technical requirement.

2. The grinding tool for improving the roughness of the deep hole of the connecting rod of the large diesel engine according to claim 1, wherein the grinding tool comprises: the grinding tool comprises a long shaft, a square joint, a pin, a short shaft, a carborundum shaft sleeve, a guide nut and a fastening nut;

the long shaft comprises a shaft part and a groove part which are connected with each other, a transverse open slot is formed in the groove part, the periphery of the shaft part is an external conical surface, the front end of the external conical surface is a small end and is provided with a right-handed external thread, and the rear end of the external conical surface is a large end and is provided with a left-handed external thread;

the short shaft comprises a threaded part and a groove part which are connected with each other, a transverse open groove is formed in the groove part, and the threaded part is provided with a rectangular external thread connected with the drill rod;

the square joint is a hexahedral cube and is connected between the groove part of the long shaft and the groove part of the short shaft through a pin to form a connecting structure of the universal cross joint;

the emery shaft sleeve is a cylindrical component, the inner hole is an inner conical hole, the taper of the inner conical hole is the same as the outer conical surface of the periphery of the long shaft part, the outer cylindrical surface of the emery shaft sleeve is sprayed with emery, a straight groove from head to tail is formed in the thickness direction, and the section is in a C shape;

the carborundum shaft sleeve is sleeved on the periphery of the shaft part of the long shaft, an inner conical hole of the carborundum shaft sleeve is tightly attached to an outer conical surface of the long shaft, the fastening nut is screwed on the rear end of the shaft part of the long shaft, and the guide nut is screwed on the front end of the shaft part of the long shaft, so that the carborundum shaft sleeve is clamped between the fastening nut and the guide nut; and the carborundum shaft sleeve moves left and right on the long shaft by rotating the fastening nut and the guide nut so as to adjust the excircle diameter of the carborundum shaft sleeve to a required size.

3. The grinding tool for improving the roughness of the deep hole of the connecting rod of the large diesel engine according to claim 2, characterized in that: the inner part of the long shaft is provided with a central through hole, the outer conical surface is provided with a plurality of long waist-shaped grooves, a plurality of small holes communicated with the central through hole are arranged in the grooves, the inner part of the short shaft is provided with a central through hole communicated with the central through hole in the drill rod, the center of the square joint is provided with a through hole communicated with the front surface and the rear surface, the through hole is communicated with the central through hole of the long shaft and the central through hole of the short shaft, the outer surface of the carborundum shaft sleeve is provided with a plurality of spiral grooves, and the grooves are internally provided with a plurality of small holes communicated with the inner holes of the carborundum shaft sleeve;

the central through hole of the drill rod, the central through hole of the short shaft, the through hole of the square joint, the central through hole of the long shaft, the long waist-shaped groove of the long shaft and the small hole of the long waist-shaped groove form a cooling liquid channel together with the inner hole of the carborundum shaft sleeve, the spiral groove and the small hole of the spiral groove.

4. The grinding tool for improving the roughness of the deep hole of the connecting rod of the large diesel engine according to claim 2, characterized in that: the conicity of the outer conical surface of the long shaft and the conicity of the inner conical hole of the carborundum shaft sleeve are both 50: 1.

5. The grinding tool for improving the roughness of the deep hole of the connecting rod of the large diesel engine according to claim 2, characterized in that: the inner hole of the guide nut is provided with a right-handed internal thread connected with the right-handed external thread at the front end of the long shaft, and the inner hole of the fastening nut is provided with a left-handed internal thread connected with the left-handed external thread at the rear end of the long shaft.

6. The grinding tool for improving the roughness of the deep hole of the connecting rod of the large diesel engine according to claim 2, characterized in that: and pin holes for connection are arranged on the open slot of the long shaft, the open slot of the short shaft and the peripheral surface of the square joint.

7. A grinding processing method for improving the roughness of the deep hole of the connecting rod of the large diesel engine by adopting the grinding tool of claim 1 is characterized in that: the grinding processing method comprises the following steps: the V-shaped iron and the supporting and guiding component are adjusted to enable the axial leads of the grinding tool, the drill rod, the connecting handle and the deep hole to be coaxial with the X axis of the planer type milling machine, the grinding tool is driven by the rotation and feed motion of the X axis of the planer type milling machine to grind and process the deep hole of the large diesel engine connecting rod, the rigidity of the drill rod is improved through the supporting and positioning of the supporting and guiding component in the process, the generated vibration and deflection are eliminated, the vibration generated by grinding is reduced to the minimum through the universal cross joint structure of the grinding tool, and stable grinding is achieved, so that the roughness of the processed deep hole meets the technical requirements.

8. The grinding processing method for improving the roughness of the deep hole of the connecting rod of the large diesel engine according to claim 7, characterized in that: the grinding method comprises the following specific steps:

1) fixing two V-shaped irons on a machine body of the planer type milling machine, placing a connecting rod on the two V-shaped irons, and calibrating and adjusting the V-shaped irons and the connecting rod to enable the axial lead of a deep hole of the connecting rod to be coaxial with the X axis of the planer type milling machine;

2) installing the supporting and guiding component on the end face of the thick end of the connecting rod, adjusting the diameter of the excircle of the carborundum shaft sleeve to a required size by rotating the guiding nut and the fastening nut, sequentially connecting the grinding tool, the drill rod and the connecting handle and connecting the grinding tool, the drill rod and the connecting handle with a main shaft of the planer type milling machine, penetrating the grinding tool and the drill rod through the guide sleeve of the supporting and guiding component and extending into the deep hole, and adjusting the position of the supporting and guiding component to ensure that the guide sleeve, the grinding tool, the drill rod and the connecting handle of the supporting and guiding component are coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine;

3) and driving the grinding tool by the rotation and feed motion of the X-axis of the planer type milling machine, entering from an orifice at one end of the deep hole, exiting from an orifice at the other end of the deep hole, grinding and processing the hole wall of the deep hole, finishing the grinding and processing of the deep hole of the connecting rod of the large diesel engine, and enabling the roughness of the processed deep hole to meet the technical requirements.

Technical Field

The invention relates to machining of diesel engine parts, in particular to a grinding method and a grinding tool for improving the roughness of a deep hole of a connecting rod of a large diesel engine, and belongs to the technical field of machining.

Background

A connecting rod of a dual-fuel series low-speed large diesel engine is a main part for transmitting power of the engine, and the processing of a deep hole of the connecting rod is a difficult problem in the field of mechanical processing. Because the diameter of the deep hole is only 22 mm, and the length-diameter ratio of the hole is more than 100, the processing quality of the deep hole can not meet the technical requirements all the time, but the processing quality of the deep hole of the connecting rod directly influences the quality and the overall performance of the engine. In the process of machining the deep hole, the roughness of the hole can not be ensured all the time because chip removal and heat dissipation are difficult, and the drill rod is slender, poor in rigidity and easy to vibrate.

At present, the connecting rod deep hole is processed by a single-tube drill (BTA) on a special deep hole drilling machine, but the roughness of the deep hole can not meet the technical requirement all the time, and no mature processing method can be used for reference. An operator can only manually polish the deep hole by using the small grinding head, so that the machining precision is poor, the machining operation is long, the labor intensity is high, the operation difficulty is high, and the production efficiency is low.

Disclosure of Invention

The invention mainly aims to: the defects of the prior art are overcome, the grinding method and the grinding tool for improving the roughness of the deep hole of the connecting rod of the large diesel engine are simple to operate and convenient to use, after the deep hole of the connecting rod is machined by a single-tube drill (BTA) on a special deep hole drilling machine, the deep hole of the connecting rod is ground and machined on a planer type milling machine by adopting a special grinding tool and the tool, and the vibration generated in the grinding process of the drill rod and the grinding tool is reduced to the minimum by enhancing the rigidity of the drill rod, so that the roughness of the deep hole is improved, and the technical problem of poor roughness is solved.

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

the utility model provides an improve grinding frock of large-scale diesel engine connecting rod deep hole roughness, installs on the planer-type milling machine, the axial lead of deep hole with the coincidence of the central line of connecting rod is equipped with the connection location screw on the terminal surface of this connecting rod thick end, its characterized in that: the grinding tool comprises a supporting guide component, a grinding tool, a drill rod, a connecting handle and two V-shaped irons;

the two V-shaped irons are placed on a lathe bed of the planer type milling machine, the connecting rod is fixedly arranged on the two V-shaped irons, and the axial lead of the deep hole is coaxial with the X axis of the planer type milling machine;

the supporting and guiding component is connected to the connecting rod and used for supporting and positioning the drill rod, the supporting and guiding component comprises a supporting rod, a positioning bolt and a guide sleeve, the guide sleeve is installed in a positioning center hole of the supporting rod, the supporting rod is installed on the end face of the thick end of the connecting rod through the positioning bolt, and the guide sleeve is coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine;

one end of the drill rod is connected with a main shaft of the planer type milling machine through the connecting handle, the other end of the drill rod is connected with the grinding tool through threads, and a central through hole through which cooling liquid passes is formed in the drill rod;

one end of the grinding tool and one end of the drill rod penetrate through the guide sleeve of the supporting and guiding component and extend into the deep hole, and the guide sleeve, the grinding tool, the drill rod and the connecting handle of the supporting and guiding component are coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine;

and driving the grinding tool through the rotation and feed motion of the X axis of the planer type milling machine to grind and process the hole wall of the deep hole, so that the roughness of the processed deep hole meets the technical requirement.

Furthermore, the grinding tool comprises a long shaft, a square joint, a pin, a short shaft, a carborundum shaft sleeve, a guide nut and a fastening nut;

the long shaft comprises a shaft part and a groove part which are connected with each other, a transverse open slot is formed in the groove part, the periphery of the shaft part is an external conical surface, the front end of the external conical surface is a small end and is provided with a right-handed external thread, and the rear end of the external conical surface is a large end and is provided with a left-handed external thread;

the short shaft comprises a threaded part and a groove part which are connected with each other, a transverse open groove is formed in the groove part, and the threaded part is provided with a rectangular external thread connected with the drill rod;

the square joint is a hexahedral cube and is connected between the groove part of the long shaft and the groove part of the short shaft through a pin to form a connecting structure of the universal cross joint;

the emery shaft sleeve is a cylindrical component, the inner hole is an inner conical hole, the taper of the inner conical hole is the same as the outer conical surface of the periphery of the long shaft part, the outer cylindrical surface of the emery shaft sleeve is sprayed with emery, a straight groove from head to tail is formed in the thickness direction, and the section is in a C shape;

the carborundum shaft sleeve is sleeved on the periphery of the shaft part of the long shaft, an inner conical hole of the carborundum shaft sleeve is tightly attached to an outer conical surface of the long shaft, the fastening nut is screwed on the rear end of the shaft part of the long shaft, and the guide nut is screwed on the front end of the shaft part of the long shaft, so that the carborundum shaft sleeve is clamped between the fastening nut and the guide nut; and the carborundum shaft sleeve moves left and right on the long shaft by rotating the fastening nut and the guide nut so as to adjust the excircle diameter of the carborundum shaft sleeve to a required size.

Furthermore, a central through hole is formed in the long shaft, a plurality of long waist-shaped grooves are formed in the outer conical surface, a plurality of small holes communicated with the central through hole are formed in the grooves, a central through hole is formed in the short shaft and communicated with the central through hole in the drill rod, a through hole penetrating through the front surface and the rear surface is formed in the center of the square joint and communicated with the central through hole of the long shaft and the central through hole of the short shaft, a plurality of spiral grooves are formed in the outer cylindrical surface of the carborundum shaft sleeve, and a plurality of small holes communicated with the inner hole of the carborundum shaft sleeve are formed in the grooves;

the central through hole of the drill rod, the central through hole of the short shaft, the through hole of the square joint, the central through hole of the long shaft, the long waist-shaped groove of the long shaft and the small hole of the long waist-shaped groove form a cooling liquid channel together with the inner hole of the carborundum shaft sleeve, the spiral groove and the small hole of the spiral groove.

Further, the taper of the outer conical surface of the long shaft and the taper of the inner conical hole of the carborundum shaft sleeve are both 50: 1.

Furthermore, the inner hole of the guide nut is provided with a right-handed internal thread connected with the right-handed external thread at the front end of the long shaft, and the inner hole of the fastening nut is provided with a left-handed internal thread connected with the left-handed external thread at the rear end of the long shaft.

Furthermore, pin holes for connection are arranged on the open slot of the long shaft, the open slot of the short shaft and the peripheral surface of the square joint.

The other technical scheme of the invention is as follows:

a grinding processing method for improving the roughness of the deep hole of the connecting rod of the large diesel engine by adopting the grinding tool comprises the following steps: the V-shaped iron and the supporting and guiding component are adjusted to enable the axial leads of the grinding tool, the drill rod, the connecting handle and the deep hole to be coaxial with the X axis of the planer type milling machine, the grinding tool is driven by the rotation and feed motion of the X axis of the planer type milling machine to grind and process the deep hole of the large diesel engine connecting rod, the rigidity of the drill rod is improved through the supporting and positioning of the supporting and guiding component in the process, the generated vibration and deflection are eliminated, the vibration generated by grinding is reduced to the minimum through the universal cross joint structure of the grinding tool, and stable grinding is achieved, so that the roughness of the processed deep hole meets the technical requirements.

Further, the grinding method comprises the following specific steps:

1) fixing two V-shaped irons on a machine body of the planer type milling machine, placing a connecting rod on the two V-shaped irons, and calibrating and adjusting the V-shaped irons and the connecting rod to enable the axial lead of a deep hole of the connecting rod to be coaxial with the X axis of the planer type milling machine;

2) installing the supporting and guiding component on the end face of the thick end of the connecting rod, adjusting the diameter of the excircle of the carborundum shaft sleeve to a required size by rotating the guiding nut and the fastening nut, sequentially connecting the grinding tool, the drill rod and the connecting handle and connecting the grinding tool, the drill rod and the connecting handle with a main shaft of the planer type milling machine, penetrating the grinding tool and the drill rod through the guide sleeve of the supporting and guiding component and extending into the deep hole, and adjusting the position of the supporting and guiding component to ensure that the guide sleeve, the grinding tool, the drill rod and the connecting handle of the supporting and guiding component are coaxial with the axial lead of the deep hole and the X axis of the planer type milling machine;

3) and driving the grinding tool by the rotation and feed motion of the X-axis of the planer type milling machine, entering from an orifice at one end of the deep hole, exiting from an orifice at the other end of the deep hole, grinding and processing the hole wall of the deep hole, finishing the grinding and processing of the deep hole of the connecting rod of the large diesel engine, and enabling the roughness of the processed deep hole to meet the technical requirements.

Compared with the prior art, the invention achieves the following effects:

1) the supporting and guiding component plays a role in supporting and positioning the drill rod, the rigidity of the drill rod is improved, the guide sleeve is wear-resistant and shockproof, certain friction damping is achieved, and the vibration and deflection generated by the drill rod are eliminated.

2) The grinding tool adopts a connection structure of a universal cross joint, so that the grinding tool and the deep hole are completely coaxial, the roughness of the deep hole is improved, the vibration generated by a drill rod and the grinding tool in the grinding process is minimized, and the stable grinding processing is realized.

3) The V-shaped iron enables the connecting rod to be quickly adjusted and positioned.

4) The carborundum axle sleeve of the grinding tool is matched with the long shaft by adopting a conical surface, so that the diameter of the excircle of the carborundum axle sleeve can be conveniently adjusted, and the universality of the grinding tool is improved.

5) The grinding tool is simple in structure, convenient to operate, assemble and disassemble, safe, reliable and beneficial to maintenance.

6) The grinding tool is internally provided with a perfect cooling liquid channel, so that the grinding tool and the wall of the deep hole can be sufficiently lubricated and cooled, and the grinding quality of the deep hole is ensured.

The grinding tool provided by the invention is ingenious and concise in structure, simple in grinding method, convenient to operate, safe and reliable, and can be suitable for grinding deep holes of connecting rods of large diesel engines of various models.

Drawings

Fig. 1 is an exploded view of the inventive tool.

FIG. 2 is a schematic view showing the connection of the support and guide member, the grinder, the drill rod and the coupling according to the present invention.

Fig. 3 is a schematic diagram of the construction of the abrasive article of the present invention.

Fig. 4 is an exploded view of the abrasive article of the present invention.

Fig. 5 is a schematic view showing the installation of the V-iron and the support guide member of the present invention.

Fig. 6 is a schematic view of the working state of the present invention.

In the figure:

a-connecting rod, B-V-shaped iron, C-support guide component, D-grinding tool, E-drill rod, F-connecting handle, A1-deep hole, A2-connecting positioning screw hole, C1-support rod, C2-positioning bolt, C3-positioning central hole, C4-guide sleeve, D1-long shaft, D2-square joint, D3-pin, D4-short shaft, D5-guide nut, D6-carborundum shaft sleeve, D7-fastening nut, UW-axial lead and GH-central axis.

Detailed Description

The invention is further illustrated in the following detailed description with reference to the figures and specific examples, which should not be taken to limit the scope of the invention.

The invention is used for grinding the deep hole of the connecting rod of the large diesel engine to improve the roughness of the deep hole after being processed, please refer to fig. 5 and fig. 6 in combination, the deep hole A1 runs through the center of the connecting rod A, the axial lead UW thereof coincides with the central line of the connecting rod A, and the two side end faces of the thick end of the connecting rod A are provided with 4 connecting and positioning screw holes A2 which are symmetrically arranged.

Referring to fig. 1, a grinding tool for improving the roughness of a deep hole of a connecting rod of a large diesel engine comprises 2V-shaped irons B, 1 supporting and guiding component C, 1 grinding tool D, 1 drill rod E and 1 connecting handle F.

The two V-shaped irons B are placed on a lathe bed of the planomiller, the connecting rod A is hung on the 2V-shaped irons B, and the deep hole A1 is located at the center of the rod body of the connecting rod A, so that the V-shaped iron B and the rod body of the connecting rod A are adjusted, and the axial lead UW of the deep hole A1 is coaxial with the axial lead of the X shaft of the planomiller.

Referring to fig. 2, the supporting and guiding member C is connected to the connecting rod a and is used for supporting and positioning the drill rod E to eliminate vibration and deflection generated during grinding and to improve rigidity of the drill rod E, and includes a supporting rod C1, a positioning bolt C2 and a guide sleeve C4.

The supporting rod C1 is made of bakelite, the center of the supporting rod is provided with a positioning center hole C3 which plays a role in positioning and supporting, and two ends of the supporting rod are respectively provided with a positioning hole matched with a connecting positioning screw hole A2 on the thick end of the connecting rod A; the guide sleeve C4 is made of bakelite and is installed in the positioning center hole C3 of the support rod C1 and is coaxial with the positioning center hole C3. Referring to fig. 1, the two positioning bolts C2 are screwed into the connecting and positioning screw holes a2 of the connecting rod a through the positioning holes, respectively, so as to mount the support rod C1 on the end surface of the thick end of the connecting rod; and simultaneously, a positioning center hole C3 and a guide sleeve C4 of the support rod C1 are coaxial with the axial lead UW of the deep hole A1 and the axial lead of the X-axis of the planer type milling machine.

Referring to fig. 1 and 2, the drill rod E is inserted into the deep hole a1 of the connecting rod a through the guide sleeve C4 of the support guide component C; the drill rod E can rotate and axially move in the guide sleeve C4, certain friction damping is provided, and the guide sleeve C4 can eliminate vibration and deflection during machining of the drill rod E. One end of the drill rod E is connected with the connecting handle F, and the connecting handle F is a No. 50 connecting handle and is connected with a main shaft of the planer type milling machine; the other end of the drill rod E inserted into the deep hole A1 is fixedly connected with the grinding tool D through a rectangular thread. The center of the drill rod E is a through hole, and high-pressure cooling liquid of a machine tool can be sprayed into the whole deep hole A1 through the central through hole and the hole in the grinding tool D so as to cool and lubricate the hole walls of the grinding tool D and the deep hole A1.

Referring to fig. 2 and 6, the grinding tool D is connected to one end of the drill rod E through a screw thread and is disposed in the deep hole a1, and the grinding tool D performs grinding on the hole wall of the deep hole a1 through a feed motion of a machine tool spindle along an X axis.

Referring to fig. 3 and 4, the grinding tool D includes a long shaft D1, a square joint D2, a pin D3, a short shaft D4, a corundum shaft sleeve D6, a guide nut D5, and a fastening nut D7.

Referring to fig. 4, the long shaft D1 includes a shaft portion and a groove portion connected to each other, and a central through hole is formed to penetrate through the long shaft D1 along the central axis GH. The groove part is provided with a transverse open groove used for connecting the square connector D2, and the groove walls on two sides of the open groove are provided with coaxial pin holes. The periphery of the shaft part is an external conical surface with the taper of 50:1, four long waist-shaped grooves are formed in the external conical surface, and a plurality of small holes communicated with a central through hole of the long shaft D1 are formed in the grooves to form a cooling liquid channel; the front end of the outer conical surface is a small end, and is provided with a section of right-handed external thread with the thread pitch of 1 mm so as to be connected with the guide nut D5; the rear end of the outer conical surface is a large end and is provided with a left-handed external thread with a thread pitch of 1 mm so as to be connected with the fastening nut D7.

The stub shaft D4 includes a screw portion and a groove portion connected to each other, and a central through hole is provided so as to penetrate therethrough. The groove part is provided with a transverse open groove used for connecting the square connector D2, and the groove walls on two sides of the open groove are provided with coaxial pin holes. The thread part is provided with four-head rectangular external threads and is connected with the drill rod E.

The square joint D2 is a hexahedral cube, the center of the square joint is provided with a through hole penetrating through the front and rear faces, four faces of the periphery are provided with pin holes penetrating through opposite faces, two opposite faces are connected with the long shaft D1 through a pin D3, the other two opposite faces are connected with the short shaft D4 through a pin D3, and the square joint D2 is connected between a groove part of the long shaft D1 and a groove part of the short shaft D4. The short shaft D4 is connected with the long shaft D1 through the square joint D2 to form a universal cross joint connecting structure, not only can the rotary feed motion be transmitted, but also certain axial deviation between the long shaft D1 and the short shaft D4 is allowed in the motion, the grinding tool D and the deep hole A1 are completely coaxial, namely the central axis GH of the long shaft D1 completely coincides with the axial line UW of the deep hole A1, and the grinding quality of the deep hole A1 is ensured; meanwhile, the connection structure of the universal cross joint enables vibration generated by the drill rod E and the grinding tool D in the grinding process to be minimized, and the grinding process is more stable and smooth.

The emery shaft sleeve D6 is a cylindrical component, the inner hole is an inner conical hole with the conicity of 50:1, the surface of the excircle is provided with a plurality of uniformly distributed spiral grooves, and a plurality of small holes communicated with the inner hole of the emery shaft sleeve D6 are arranged in the grooves; the carborundum shaft sleeve D6 is split by a straight groove with the width of 2 mm from head to tail along the thickness direction, so that the section of the carborundum shaft sleeve D6 is in a C shape, and a layer of carborundum with the thickness of about 2 mm is sprayed on the surface of the excircle of the carborundum shaft sleeve D6; the spiral groove and the small hole inside the spiral groove form a cooling liquid channel, so that the cooling liquid can fully cool and lubricate the carborundum and the hole wall on the carborundum shaft sleeve D6, and the grinded scrap iron is washed away. To ensure good grinding conditions.

The emery shaft sleeve D6 is sleeved on the periphery of the shaft part of the long shaft D1, and the inner conical hole of the emery shaft sleeve D6 is tightly attached to the outer conical surface of the long shaft D1; fastening nut D7's hole is equipped with the levogyration internal thread, connect in soon on the levogyration external thread of major axis D1's axial region rear end, leading nut D5's front end is the toper, can play the guide effect when installation and abrasive machining, and this leading nut D5's hole is equipped with the dextrorotation internal thread, connect in soon on the dextrorotation external thread of major axis D1's axial region front end, thereby emery shaft sleeve D6 presss from both sides and arranges in between fastening nut D7 and the leading nut D5. The emery shaft sleeve D6 can move left and right on the long shaft D1 by rotating the fastening nut D7 and the guide nut D5, and the excircle diameter of the emery shaft sleeve D6 can be adjusted to a required size due to the relative sliding effect of the 50:1 inner conical hole of the emery shaft sleeve D6 and the 50:1 outer conical surface of the long shaft D1; because the thread pitch of the right-handed internal thread of the guide nut D5 is 1 mm, and the taper of the external conical surface of the shaft part of the long shaft D1 is 50:1, the carborundum shaft sleeve D6 can be pushed to move and the diameter of the external circle can be adjusted to be increased by 0.02 mm when the guide nut D5 is turned one circle at the right.

And the cooling liquid in the central through hole of the long shaft D1 can flow to the surface of the carborundum shaft sleeve D6 through a small hole in the long waist-shaped groove and a small hole in the carborundum shaft sleeve D6 spiral groove, and plays a role in cooling and lubricating grinding.

Referring to fig. 6, the method for grinding the deep hole of the large diesel engine connecting rod by using the grinding tool includes:

the V-shaped iron B and the supporting and guiding component C are adjusted to enable the shaft axis UW of the grinding tool D, the drill rod E, the connecting handle F and the deep hole A1 to be coaxial with the shaft axis of the planer type milling machine X shaft, the grinding tool D is driven by the rotation and feed motion of the planer type milling machine X shaft to grind and process the large diesel engine connecting rod deep hole A1, the supporting and guiding component C supports and positions the drill rod E in the process, the rigidity of the drill rod E is improved, the vibration and deflection generated by the drill rod E are eliminated, the vibration generated by grinding is reduced to the minimum by the universal cross joint structure of the grinding tool D, the grinding process is more stable, and therefore the roughness of the processed deep hole A1 meets the technical requirements.

The grinding method comprises the following specific steps:

1) placing two V-shaped irons B on a bed body of a planomiller, hoisting and placing a connecting rod A on the two V-shaped irons B, calibrating and adjusting the V-shaped irons B and retesting a rod body of the connecting rod A, enabling a shaft axis UW of a deep hole A1 of the connecting rod A to be coaxial with a shaft axis of an X shaft of the planomiller, and locking and fixing the two V-shaped irons B.

2) The supporting and guiding component C is arranged on the end face of the thick end of the connecting rod A, the diameter of the outer circle of the carborundum shaft sleeve D6 is adjusted to a required size by rotating the guiding nut D5 and the fastening nut D7, the grinding tool D, the drill rod E and the connecting handle F are sequentially connected and connected with the main shaft of the planomiller through the connecting handle F, the grinding tool D and the drill rod E penetrate through the guide sleeve C4 of the supporting and guiding component C and extend into the deep hole A1, and the position of the supporting and guiding component C is adjusted to enable the guide sleeve C4, the grinding tool D, the drill rod E and the connecting handle F of the supporting and guiding component C to be coaxial with the axial lead UW of the deep hole A1 and the axial lead of the X shaft of the planomiller.

3) And driving the grinding tool D through the rotation and feed motion of the X-axis of the planer type milling machine, entering from an orifice at one end of the deep hole A1, exiting from an orifice at the other end of the deep hole A1, and grinding and machining the hole wall of the deep hole A1 to finish the grinding and machining of the deep hole A1 of the connecting rod of the large diesel engine, so that the roughness of the machined deep hole A1 meets the technical requirements.

After the grinding tool and the grinding method are adopted, on one hand, the labor intensity of an operator is obviously reduced, on the other hand, the production efficiency is improved, the operation is simpler, more convenient and safer, and the problem that the roughness of the deep hole of the connecting rod cannot meet the technical requirement is solved.

The scope of the invention is not limited to the above embodiments, but also includes other obvious variations and alternatives, and all equivalent variations and modifications made according to the content of the invention are within the scope of the invention.