Lathe fixture and machining method of eccentric pin seat

Abstract

The invention relates to the technical field of machining, in particular to a lathe fixture and an eccentric pin boss machining method.The lathe fixture comprises a fixture body, the fixture body is of a cylinder structure, a stepped hole extending in the axial direction of the fixture body is formed in the center of the fixture body, the fixture body is further provided with an eccentric hole adjacent to the stepped hole, and the eccentric hole is used for containing an eccentric shaft; the stepped hole is used for being arranged corresponding to a to-be-machined hole. One end of the clamp body is covered with the cover body, so that a containing space for containing the eccentric pin boss blank is formed, and an avoiding hole is formed in the center of the cover body; the pressing block is used for pressing the bottom surface of the mounting hole, and a first through hole is formed in the center of the pressing block; the pressing ring is arranged between the cover body and the mounting hole and arranged on the peripheral side of the pressing block in a sleeving manner; and the fastening assembly comprises a taper pin and a nut, and the taper pin sequentially penetrates through the stepped hole, the to-be-machined hole and the first through hole and is connected with the nut. The outer circle and the inner hole of the eccentric pin boss can be clamped and machined at a time, and the machining precision and the machining efficiency of the eccentric pin boss are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining, in particular to a lathe fixture and a machining method of an eccentric pin seat. BACKGROUND

[0002] The eccentric pin seat is often used in the variable pitch mechanism of the propeller, which is used to drive the propeller blade to rotate to realize the variable pitch of the propeller blade. Figure 1 As shown in the figure, the eccentric pin seat 200 is a boss structure, which is welded at the root of the propeller blade. One end of the eccentric pin seat 200 has a welded stop 203, and the welded stop 203 is matched with the inner hole of the propeller root with a gap of 0.02mm. In order to ensure that the distance between the eccentric pin 202 and the axis of the propeller blade after welding of the eccentric pin seat 200 meets the design requirements, the welded stop 203 needs to be processed by using the to-be-processed hole 204 at the center of the eccentric pin seat 200, and the threads on the to-be-processed hole 204 are turned at the same time. The related technology generally uses a three-jaw fixture to clamp the outer periphery of the base plate 201 of the eccentric pin seat 200. After the to-be-processed hole 204 is aligned, the welded stop 203 is turned, and the threads of the to-be-processed hole 204 are processed. The alignment needs to be performed every time the clamping is performed. Due to the clamping force, the eccentric pin seat 200 is easily deformed, and the matching accuracy of the final propeller assembly cannot be guaranteed. SUMMARY

[0003] The present application provides a lathe fixture and a machining method of an eccentric pin seat, which can process the welded stop and the threaded hole of the eccentric pin seat by one-time clamping, and can eliminate the radial internal stress generated by clamping the eccentric pin seat, thereby improving the machining accuracy and efficiency of the eccentric pin seat.

[0004] In one aspect, the present application provides a lathe fixture for machining an eccentric pin seat blank, the eccentric pin seat blank comprising a base plate and an eccentric shaft arranged at one end of the base plate, the other end of the base plate being provided with a mounting hole recessed inwardly, and the center of the base plate being further provided with a to-be-processed hole. The lathe fixture comprises: a fixture body arranged in a cylindrical structure, the center of the fixture body being provided with a stepped hole extending along the axial direction of the fixture body, and the fixture body being further provided with an eccentric hole adjacent to the stepped hole, the eccentric hole being used to accommodate the eccentric shaft, and the stepped hole being used to correspond to the to-be-processed hole; a cover body detachably connected to one end of the fixture body to form a containing space for placing the eccentric pin seat blank, the center of the cover body being provided with a relief hole; a pressing block used to press the bottom surface of the mounting hole, the center of the pressing block being provided with a first through hole; a pressing ring arranged between the cover body and the mounting hole and sleeved on the outer periphery of the pressing block, the axial height of the pressing ring being greater than the depth of the mounting hole; and a fastening assembly comprising a taper pin and a nut, the taper pin sequentially penetrating the stepped hole, the to-be-processed hole and the first through hole, and being connected with the nut.

[0005] In a possible implementation, the taper pin comprises a pin shaft and a mounting block, an outer periphery of the pin shaft is provided with external threads, a first end of the pin shaft is integrally connected with the mounting block, a second end of the pin shaft is connected with a nut, and the mounting block is matched with the stepped hole.

[0006] In a possible implementation, the mounting block is arranged in an axially diverging manner away from the mounting block along the pin shaft, the stepped hole comprises a first hole and a second hole arranged in sequence along the axial direction of the clamp body, the first hole is used for being connected with the first end of the pin shaft, and the second hole is used for accommodating the mounting block.

[0007] In a possible implementation, the second end of the taper pin is provided with at least one inwardly recessed flat surface.

[0008] In a possible implementation, the pressing block has opposite first and second end faces in the axial direction of the pressing block, the first end face is abutted to the bottom surface of the mounting hole, and the second end face is provided with a gripping handle extending outward in the axial direction.

[0009] In a possible implementation, the outer peripheral surface of one end of the clamp body is threadedly connected with the cover body.

[0010] In a possible implementation, the outer peripheral side of the cover body is further provided with a plurality of positioning holes at intervals.

[0011] In a possible implementation, the clamp body is further provided with a weight-reducing hole, a center line of the weight-reducing hole, a center line of the eccentric hole and a center line of the stepped hole are in the same plane.

[0012] In a possible implementation, the center of the pressing ring is provided with a second through hole, an inner diameter of the second through hole is greater than an outer diameter of the pressing block, and an end of the pressing ring towards the mounting hole is provided with a chamfer.

[0013] In another aspect, the application further provides a machining method of the eccentric pin seat, which is machined by using the lathe clamp of the application, and the machining method comprises the following steps: providing a clamp body, a cover body, a pressing block and a fastening assembly of the lathe clamp, and providing an eccentric pin seat blank, the eccentric pin seat blank comprises a base plate and an eccentric shaft arranged at one end of the base plate, the other end of the base plate is provided with an inwardly recessed mounting hole, and the center of the base plate is further provided with a to-be-machined hole; clamping the outer peripheral side of the clamp body by using a three-jaw chuck and fixing the clamp body to a lathe; passing the eccentric shaft through the eccentric hole of the clamp body, and correspondingly arranging the stepped hole of the clamp body and the to-be-machined hole; pressing the pressing block against the bottom surface of the mounting hole; sequentially passing the taper pin of the fastening assembly through the stepped hole, the to-be-machined hole and the first through hole of the pressing block, and connecting the taper pin with the nut of the fastening assembly; turning the outer peripheral surface of the base plate close to the mounting hole by using a tool to form a welding stop; pressing the pressing ring against the bottom surface of the mounting hole, connecting the cover body with the outer peripheral surface of the clamp body, and removing the fastening assembly and the pressing block; and passing the tool through the avoiding hole of the cover body to turn the to-be-machined hole into a threaded hole.

[0014] According to the lathe fixture and the machining method of the eccentric pin seat provided in the application, the lathe fixture comprises a clamping body, a cover body, a pressing block and a fastening assembly, the cover body is covered on one end of the clamping body to form a containing space for placing the eccentric pin seat blank, the eccentric hole of the clamping body is used for accommodating the eccentric shaft of the eccentric pin seat blank, the stepped hole of the clamping body is used for being correspondingly arranged with the hole to be machined of the eccentric pin seat blank, then the clamping body is clamped by a three-jaw fixture and fixed to the lathe, the center of the eccentric pin seat is aligned through the eccentric hole and the stepped hole of the clamping body, so that the welding stop and the threaded hole of the eccentric pin seat can be machined through one-time clamping, and the radial internal stress generated by clamping can be eliminated, and the machining precision and the machining efficiency of the eccentric pin seat are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 The structure schematic diagram of the eccentric pin seat provided in the embodiments of the application is shown in the figure.

[0017] Figure 2 The overall structure schematic diagram of the lathe fixture provided in the embodiments of the application is shown in the figure.

[0018] Figure 3 The exploded structure schematic diagram of the lathe fixture shown in the figure is shown in the figure. Figure 2 The cross-sectional structure schematic diagram of the lathe fixture shown in the figure is shown in the figure.

[0019] Figure 4 The cross-sectional structure schematic diagram of the lathe fixture shown in the figure is shown in the figure. Figure 2 The structure schematic diagram of the lathe fixture shown in the figure is shown in the figure.

[0020] Figure 5 The structure schematic diagram of the lathe fixture shown in the figure is shown in the figure. Figure 4 The structure schematic diagram of the lathe fixture shown in the figure is shown in the figure.

[0021] Figure 6 The cross-sectional structure schematic diagram of the lathe fixture shown in the figure is shown in the figure. Figure 5 The cross-sectional structure schematic diagram of the lathe fixture shown in the figure is shown in the figure.

[0022] Figure 7 The structure schematic diagram of the lathe fixture shown in the figure is shown in the figure. Figure 6 The structure schematic diagram of the lathe fixture shown in the figure is shown in the figure.

[0023] Figure 8 The cross-sectional structure schematic diagram of the lathe fixture shown in the figure is shown in the figure. Figure 7 The cross-sectional structure schematic diagram of the lathe fixture shown in the figure is shown in the figure.

[0024] Figure 9A flowchart illustrating the processing method of the eccentric pin seat provided in the embodiments of this application.

[0025] The attached figures are labeled as follows:

[0026] 100. Lathe fixture; 200. Eccentric pin blank; 201. Base plate; 202. Eccentric shaft; 203. Weld stop; 204. Hole to be machined; 205. Mounting hole; 300. Three-jaw chuck;

[0027] 1. Fixture body; 11. Stepped hole; 111. First hole; 112. Second hole; 12. Eccentric hole; 13. Weight reduction hole;

[0028] 2. Cover body; 21. Clearance hole; 22. Positioning hole;

[0029] 3. Pressure block; 30. First through hole; 31. First end face; 32. Second end face; 33. Grip handle; 34. Chamfer;

[0030] 4. Fastening assembly; 41. Tapered pin; 411. Pin; a. First end; b. Second end; c. Flat surface; 412. Mounting block; 42. Nut;

[0031] 5. Pressure ring; 51. Second through hole; 52. Chamfer. Detailed Implementation

[0032] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] like Figures 1 to 8 As shown, this application embodiment provides a lathe fixture 100 for machining an eccentric pin seat blank 200. The eccentric pin seat blank 200 includes a base plate 201 and an eccentric shaft 202 disposed at one end of the base plate 201. The other end of the base plate 201 is provided with an inwardly recessed mounting hole 205, and the center of the base plate 201 is also provided with a hole 204 to be machined.

[0034] In related technologies, a three-jaw chuck is generally used to clamp the outer peripheral surface of the substrate 201 of the eccentric pin seat 200. After aligning the hole 204 to be machined, the weld stop 203 is machined, and then the thread of the hole 204 is machined. Alignment is required each time the chuck is clamped. Because the clamping force applied to the outer peripheral surface can easily cause the eccentric pin seat 200 to deform, the final fitting accuracy of the blade assembly cannot be guaranteed.

[0035] To this end, the lathe fixture 100 provided by the embodiment of the present application can process the welding collar and the threaded hole of the eccentric pin seat through one-time clamping, can eliminate the radial internal stress generated by clamping the eccentric pin seat, and improves the machining precision of the eccentric pin seat.

[0036] Specifically, the lathe fixture 100 comprises a clamping body 1, a cover 2, a pressing block 3, a pressing ring 5, and a fastening assembly 4.

[0037] The clamping body 1 is in a cylindrical structure, the center of the clamping body 1 is provided with a stepped hole 11 extending along the axial direction of the clamping body 1, and the clamping body 1 is further provided with an eccentric hole 12 adjacent to the stepped hole 11, the eccentric hole 12 is used for accommodating an eccentric shaft 202, and the stepped hole 11 is used for being correspondingly arranged with a to-be-machined hole 204.

[0038] The cover 2 is detachably connected with one end of the clamping body 1 to form a containing space for placing an eccentric pin seat blank 200, and the center of the cover 2 is provided with a relief hole 21.

[0039] The pressing block 3 is used for pressing the bottom surface of the mounting hole 205, and the center of the pressing block 3 is provided with a first through hole 30.

[0040] The pressing ring 5 is arranged between the cover 2 and the mounting hole 205, and is sleeved on the outer circumferential side of the pressing block 3, and the axial height of the pressing ring 5 is greater than the depth of the mounting hole 205.

[0041] The fastening assembly 4 comprises a taper pin 41 and a nut 42, the taper pin 41 penetrates the stepped hole 11, the to-be-machined hole 204, and the first through hole 30 in sequence, and is connected with the nut 42.

[0042] In the embodiment, the lathe fixture 100 adopts different parts when turning the welding collar 203 of the outer circumferential surface of the base plate 201 of the eccentric pin seat blank 200 and when turning the to-be-machined hole 204 of the eccentric pin seat blank 200, but only needs to be once centered with the center of the eccentric pin seat blank 200, reduces the number of centering, and improves the machining precision and machining efficiency.

[0043] Specifically, as Figure 5 and Figure 6As shown in the figure, when turning the welding collar 203 of the base plate 201 of the eccentric pin seat blank 200, the outer periphery of the clamping fixture 1 is clamped by the three-jaw fixture 300 and fixed to the lathe, then the eccentric shaft 202 of the eccentric pin seat blank 200 is inserted into the eccentric hole 12 of the clamping fixture 1, the stepped hole 11 of the clamping fixture 1 is arranged in correspondence with the to-be-processed hole 204 of the eccentric pin seat blank 200, the pressure block 3 is used to press the bottom surface of the mounting hole 205, the taper pin 41 of the fastening assembly 4 is sequentially inserted through the stepped hole 11, the to-be-processed hole 204 and the first through hole 30 arranged at the center of the pressure block 3, and connected with the nut 42. In this way, after the eccentric pin seat blank 200 is assembled with the lathe fixture 100, the outer peripheral surface of the base plate 201 close to the mounting hole 205 can be directly turned by a tool, and the machining of the welding collar 203 is completed.

[0044] As shown in the figure, when turning the welding collar 203 of the base plate 201 of the eccentric pin seat blank 200, the outer periphery of the clamping fixture 1 is clamped by the three-jaw fixture 300 and fixed to the lathe, then the eccentric shaft 202 of the eccentric pin seat blank 200 is inserted into the eccentric hole 12 of the clamping fixture 1, the stepped hole 11 of the clamping fixture 1 is arranged in correspondence with the to-be-processed hole 204 of the eccentric pin seat blank 200, the pressure block 3 is used to press the bottom surface of the mounting hole 205, the taper pin 41 of the fastening assembly 4 is sequentially inserted through the stepped hole 11, the to-be-processed hole 204 and the first through hole 30 arranged at the center of the pressure block 3, and connected with the nut 42. In this way, after the eccentric pin seat blank 200 is assembled with the lathe fixture 100, the outer peripheral surface of the base plate 201 close to the mounting hole 205 can be directly turned by a tool, and the machining of the welding collar 203 is completed. Figure 7 Figure 8 As shown in the figure, when turning the welding collar 203 of the base plate 201 of the eccentric pin seat blank 200, the outer periphery of the clamping fixture 1 is clamped by the three-jaw fixture 300 and fixed to the lathe, then the eccentric shaft 202 of the eccentric pin seat blank 200 is inserted into the eccentric hole 12 of the clamping fixture 1, the stepped hole 11 of the clamping fixture 1 is arranged in correspondence with the to-be-processed hole 204 of the eccentric pin seat blank 200, the pressure block 3 is used to press the bottom surface of the mounting hole 205, the taper pin 41 of the fastening assembly 4 is sequentially inserted through the stepped hole 11, the to-be-processed hole 204 and the first through hole 30 arranged at the center of the pressure block 3, and connected with the nut 42. In this way, after the eccentric pin seat blank 200 is assembled with the lathe fixture 100, the outer peripheral surface of the base plate 201 close to the mounting hole 205 can be directly turned by a tool, and the machining of the welding collar 203 is completed.

[0045] As shown in the figure, when turning the welding collar 203 of the base plate 201 of the eccentric pin seat blank 200, the outer periphery of the clamping fixture 1 is clamped by the three-jaw fixture 300 and fixed to the lathe, then the eccentric shaft 202 of the eccentric pin seat blank 200 is inserted into the eccentric hole 12 of the clamping fixture 1, the stepped hole 11 of the clamping fixture 1 is arranged in correspondence with the to-be-processed hole 204 of the eccentric pin seat blank 200, the pressure block 3 is used to press the bottom surface of the mounting hole 205, the taper pin 41 of the fastening assembly 4 is sequentially inserted through the stepped hole 11, the to-be-processed hole 204 and the first through hole 30 arranged at the center of the pressure block 3, and connected with the nut 42. In this way, after the eccentric pin seat blank 200 is assembled with the lathe fixture 100, the outer peripheral surface of the base plate 201 close to the mounting hole 205 can be directly turned by a tool, and the machining of the welding collar 203 is completed. ​

[0046] It can be understood that the compression ring 5 in the embodiment of the application can also be integrally formed with the cover 2, as long as the compression ring 5 is sleeved on the outer circumferential side of the compression block 3 and the axial height of the compression ring 5 is greater than the depth of the mounting hole 205, and details are not repeated.

[0047] According to the lathe clamp 100 provided by the application, the clamp body 1, the cover 2, the compression block 3 and the fastening assembly 4 are provided, the cover 2 is covered on one end of the clamp body 1 to form a containing space for placing the eccentric pin seat blank 200, the eccentric hole 12 of the clamp body 1 is used for accommodating the eccentric shaft 202 of the eccentric pin seat blank 200, the stepped hole 11 of the clamp body 1 is used for being correspondingly arranged with the to-be-processed hole 204 of the eccentric pin seat blank 200, then the clamp body 1 is clamped by a three-jaw clamp, the center of the eccentric pin seat blank 200 is aligned through the eccentric hole 12 and the stepped hole 11 of the clamp body 1, so that the welding stop 203 and the threaded hole of the eccentric pin seat blank 200 can be processed through one-time clamping, and the radial internal stress generated by clamping can be eliminated, and the machining precision and machining efficiency of the eccentric pin seat blank 200 are improved.

[0048] In some embodiments, the taper pin 41 comprises a pin shaft 411 and a mounting block 412, the outer periphery of the pin shaft 411 is provided with external threads, the first end a of the pin shaft 411 is integrally connected with the mounting block 412, the second end b of the pin shaft 411 is connected with the nut 42, and the mounting block 412 is matched with the stepped hole 11.

[0049] As shown in Figure 3 and Figure 4 , the pin shaft 411 of the taper pin 41 is a double-headed bolt, the first end a of the pin shaft 411 is integrally formed with the mounting block 412, the second end b of the pin shaft 411 is connected with the nut 42, and the mounting block 412 is matched with the stepped hole 11, so that the clamp body 1, the eccentric pin seat blank 200 and the compression block 3 can be fastened and connected as a whole, and it is ensured that the center of the eccentric pin seat blank 200 can be aligned through the eccentric hole 12 and the stepped hole 11 of the clamp body 1, and the machining precision of the eccentric pin seat blank 200 is improved.

[0050] In some embodiments, the mounting block 412 is gradually expanded along the axial direction of the pin shaft 411 away from the mounting block 412, and the stepped hole 11 comprises a first hole 111 and a second hole 112 arranged in sequence along the axial direction of the clamp body 1, the first hole 111 is used for connecting with the first end a of the pin shaft 411, and the second hole 112 is used for accommodating the mounting block 412.

[0051] As shown in Figure 4As shown, the mounting block 412 is a tapered body that gradually expands axially away from the pin 411. The first hole 111 of the stepped hole 11 can be threadedly connected to the first end a of the pin 411, facilitating assembly and disassembly. The second hole 112 of the stepped hole 11 is a tapered hole, which further improves the fitting accuracy between the mounting block 412 and the stepped hole 11, preventing the eccentric pin blank 200 from radially shifting during the turning of the outer peripheral surface of the substrate 201.

[0052] In some embodiments, the second end b of the tapered pin 41 is provided with at least one inwardly recessed plane c.

[0053] like Figure 3 As shown, the second end b of the tapered pin 41 is provided with two inwardly recessed planes c, which makes it easy for the operator to use a tool to clamp the planes c and rotate the tapered pin 41 to remove the fastening assembly 4 from the lathe fixture 100, thereby improving the disassembly and assembly efficiency.

[0054] In some embodiments, the pressure block 3 has a first end face 31 and a second end face 32 along its own axial direction. The first end face 31 abuts against the bottom surface of the mounting hole 205, and the second end face 32 is provided with a grip handle 33 extending outward along the axial direction.

[0055] like Figures 2 to 5 As shown, the pressure block 3 has a disc-shaped structure, and its outer diameter is smaller than the inner diameter of the mounting hole 205 of the eccentric pin seat blank 200, which facilitates the removal of the pressure block 3 from the mounting hole 205. The second end face 32 of the pressure block 3 is provided with a gripping handle 33 extending outward along the axial direction, which makes it easy for the operator to hold the gripping handle 33 to remove the pressure block 3 from the lathe fixture 100, thereby improving the efficiency of disassembly and assembly.

[0056] In some embodiments, the outer peripheral surface of one end of the clamp body 1 is threadedly connected to the cover body 2.

[0057] As mentioned earlier, when machining the hole 204 in the eccentric pin blank 200, it is necessary to connect the cover 2 to one end of the fixture body 1 to form an accommodating space for placing the eccentric pin blank 200. The outer circumferential surface of one end of the fixture body 1 is provided with an external thread, and the cover 2 is correspondingly provided with an internal thread. The cover 2 is threadedly connected to one end of the fixture body 1, realizing a detachable connection between the cover 2 and the fixture body 1, thereby improving the efficiency of disassembly and assembly.

[0058] In some embodiments, a plurality of positioning holes 22 are also provided at intervals on the outer periphery of the cover 2.

[0059] like Figure 3 As shown, when the clamp body 1 and the cover body 2 are threaded together, the tool can be inserted through the positioning hole 22 to assist the threaded connection between the clamp body 1 and the cover body 2, ensuring that there is no axial displacement between the clamp body 1 and the cover body 2, and improving the tightening efficiency.

[0060] In some embodiments, the clamp body 1 is further provided with a weight reduction hole 13, the center line of the weight reduction hole 13, the center line of the eccentric hole 12 and the center line of the stepped hole 11 are in the same plane.

[0061] like Figure 3 As shown, the center lines of the weight reduction hole 13, the eccentric hole 12, and the stepped hole 11 of the fixture body 1 are in the same plane. The weight reduction hole 13 and the eccentric hole 12 are arranged opposite to each other to ensure that the fixture body 1 remains balanced during the turning process and to prevent centrifugal force from affecting the machining accuracy of the eccentric pin seat blank 200.

[0062] In some embodiments, the center of the pressure ring 5 is provided with a second through hole 51, the inner diameter of the second through hole 51 is larger than the outer diameter of the pressure block 3, and the end of the pressure ring 5 facing the mounting hole 205 is provided with a chamfer 52.

[0063] like Figure 7 and Figure 8 As shown, the end of the pressure ring 5 facing the welding stop is provided with a chamfer 52, which can avoid machining errors such as debris or protrusions at the edge of the mounting hole 205, and further improve the clamping force between the pressure ring 5 and the eccentric pin seat blank 200.

[0064] In addition, the inner diameter of the second through hole 51 at the center of the pressure ring 5 is larger than the outer diameter of the pressure block 3. For example, the difference between the inner diameter of the second through hole 51 and the outer diameter of the pressure block 3 is greater than 1mm. This makes it convenient to assemble the pressure ring 5 on the outer periphery of the pressure block 3 without removing the eccentric pin blank 200 from the fixture body 1 when machining the hole 204 to be machined. At the same time, it is convenient to remove the pressure block 3 from the pressure ring 5, saving the number of times to install and align, and improving the efficiency of disassembly and assembly.

[0065] Figure 9 A flowchart illustrating the processing method of the eccentric pin seat provided in the embodiments of this application.

[0066] like Figure 9 As shown, this application provides a machining method for an eccentric pin seat, which is machined using a lathe fixture 100 according to this application. The machining method includes the following steps S1 to S6.

[0067] Step S1: Provide an eccentric pin blank 200 and a clamping body 1, a cover 2, a pressure block 3 and a fastening assembly 4 for a lathe fixture 100. The eccentric pin blank 200 includes a base plate 201 and an eccentric shaft 202 disposed at one end of the base plate 201. The other end of the base plate 201 is provided with an inwardly recessed mounting hole 205. The center of the base plate 201 is also provided with a hole 204 to be processed.

[0068] Step S2: clamp the outer circumferential side of the clamping body 1 with the three-jaw clamp 300 and fix it to the lathe; step S3: pass the eccentric shaft 202 of the eccentric pin seat blank 200 through the eccentric hole 12 of the clamping body 1, and correspondingly arrange the stepped hole 11 of the clamping body 1 with the to-be-processed hole 204, press the bottom surface of the mounting hole 205 with the pressing block 3, pass the taper pin 41 of the fastening assembly 4 through the stepped hole 11, the to-be-processed hole 204 and the first through hole 30 of the pressing block 3 in sequence, and connect it with the nut 42 of the fastening assembly 4;

[0069] Step S4: use a tool to turn the outer circumferential circle of the base plate 201 close to the mounting hole 205 to form the welding stop 203;

[0070] Step S5: press the bottom surface of the mounting hole 205 with the pressing ring 5, connect the cover body 2 with the outer circumferential surface of the clamping body 1, and remove the fastening assembly 4 and the pressing block 3;

[0071] Step S6: use a tool to pass through the avoiding hole 21 of the cover body 2 to turn the to-be-processed hole 204 into a threaded hole.

[0072] According to the machining method of the eccentric pin seat provided in the application, the lathe clamp 100 of the embodiment of the application is used for machining, the lathe clamp 100 includes the clamping body 1, the cover body 2, the pressing block 3 and the fastening assembly 4, the cover body 2 is covered on one end of the clamping body 1 to form a containing space for placing the eccentric pin seat blank 200, the eccentric hole 12 of the clamping body 1 is used for accommodating the eccentric shaft 202 of the eccentric pin seat blank 200, the stepped hole 11 of the clamping body 1 is used for correspondingly arranging the to-be-processed hole 204 of the eccentric pin seat blank 200, then the clamping body 1 is clamped with the three-jaw clamp 300 and fixed to the lathe, the center of the eccentric pin seat blank 200 is aligned through the eccentric hole 12 and the stepped hole 11 of the clamping body 1, so that the welding stop 203 and the threaded hole of the eccentric pin seat blank 200 can be machined by one-time clamping, and the radial internal stress generated by clamping can be eliminated, and the machining precision and machining efficiency of the eccentric pin seat blank 200 are improved.

[0073] It should be noted that the "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like mentioned in the specification represent that the described embodiment can include a particular feature, structure or characteristic, but not necessarily every embodiment. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure or characteristic in connection with other embodiments whether explicitly described or not.

[0074] It should be readily understood that "on," "over," and "above" in the present disclosure are to be interpreted in the broadest context, such that "on" means not only "directly on" but also includes the meaning of "on" with intermediate features or layers therebetween, and "over" or "above" includes not only the meaning of "over" or "above" but also the meaning of "over" or "above" with no intermediate features or layers therebetween (i.e., directly on).

[0075] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0076] It should be noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0077] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, but not limiting, the technical solutions of the present application; even though the present application has been described in detail with reference to the above-described embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above-described embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lathe fixture for machining an eccentric pin boss blank, the eccentric pin boss blank comprising a base plate and an eccentric shaft arranged at one end of the base plate, an inwardly recessed mounting hole being arranged at the other end of the base plate, and a hole to be machined being arranged at the center of the base plate, characterized in that, The lathe fixture comprises: a clamping body provided in a cylindrical structure, a stepped hole extending along an axial direction of the clamping body is arranged at a center of the clamping body, and an eccentric hole adjacent to the stepped hole is arranged on the clamping body, the eccentric hole is used for accommodating the eccentric shaft, and the stepped hole is used for corresponding arrangement with the hole to be machined; a cover body detachably connected to one end of the clamping body to form a containing space for placing the eccentric pin seat blank, and an avoiding hole is arranged at a center of the cover body; a pressing block used for pressing a bottom surface of the mounting hole, a first through hole is arranged at a center of the pressing block; a pressing ring arranged between the cover body and the mounting hole and sleeved on an outer circumferential side of the pressing block, an axial height of the pressing ring is greater than a depth of the mounting hole, and a fastening assembly comprising a taper pin and a nut, the taper pin penetrates the stepped hole, the hole to be machined and the first through hole in sequence and is connected with the nut.

2. The lathe chuck of claim 1, wherein, The taper pin comprises a pin shaft and a mounting block, an outer circumferential surface of the pin shaft is provided with an external thread, a first end of the pin shaft is integrally connected with the mounting block, a second end of the pin shaft is connected with the nut, and the mounting block is matched with the stepped hole.

3. The lathe chuck of claim 2, wherein, The mounting block is arranged in a gradually expanding manner along an axial direction of the pin shaft away from the mounting block, the stepped hole comprises a first hole and a second hole arranged in sequence along an axial direction of the clamping body, the first hole is used for connecting with the first end of the pin shaft, and the second hole is used for accommodating the mounting block.

4. The lathe chuck of claim 2, wherein, The second end of the pin shaft is provided with at least one inwardly recessed flat surface.

5. The lathe chuck of claim 1, wherein, The pressing block has opposite first and second end surfaces along an axial direction thereof, the first end surface abuts to a bottom surface of the mounting hole, and the second end surface is provided with a gripping handle extending outwardly along the axial direction.

6. The lathe chuck of claim 1, wherein, An outer circumferential surface of one end of the clamping body is threadedly connected with the cover body.

7. The lathe chuck of claim 1, wherein, A plurality of positioning holes are further arranged at intervals on an outer circumferential side of the cover body.

8. A lathe chuck as claimed in any one of claims 1 to 7, characterised in that, The clamping body is further provided with a weight-reducing hole, a center line of the weight-reducing hole, a center line of the eccentric hole and a center line of the stepped hole are in the same plane.

9. A lathe chuck as claimed in any one of claims 1 to 7, characterised in that, A second through hole is arranged at a center of the pressing ring, an inner diameter of the second through hole is greater than an outer diameter of the pressing block, and a chamfer is arranged at one end of the pressing ring facing the mounting hole.

10. A method of machining an eccentric pin boss using the lathe fixture according to any one of claims 1 to 9, characterized in that, The machining method comprises: providing an eccentric pin seat blank and a clamping body, a cover body, a pressing block and a fastening assembly of the lathe fixture, the eccentric pin seat blank comprises a base plate and an eccentric shaft arranged at one end of the base plate, a mounting hole recessed inwardly is arranged at the other end of the base plate, and a hole to be machined is further arranged at a center of the base plate; clamping an outer circumferential side of the clamping body by a three-jaw chuck and fixing the clamping body to a lathe; penetrating the eccentric shaft through the eccentric hole of the clamping body, corresponding arrangement of the stepped hole of the clamping body with the hole to be machined, pressing the bottom surface of the mounting hole by the pressing block, and penetrating the taper pin of the fastening assembly through the stepped hole, the hole to be machined and the first through hole of the pressing block in sequence and connecting the taper pin with the nut of the fastening assembly; turning an outer circumferential surface of the base plate close to the mounting hole by a tool to form a welding stopper; The pressing ring is pressed against the bottom surface of the mounting hole, the cover is connected with the outer peripheral surface of the clamp body, and the fastening assembly and the pressing block are removed; A tool is passed through the avoiding hole of the cover to turn the hole to be processed into a threaded hole.

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