A device and method for the assembly of a piston rod and a latch shaft

Abstract

This invention provides a machining apparatus and method for fitting piston rods and pin shafts. The machining apparatus includes a clamping body, a drill template support, a fork-shaped drill template, a right support, a semi-circular seat, and a pressure plate. The clamping body has a process hole, and the drill template support and the right support are mounted on the clamping body. One end of the fork-shaped drill template is hinged to the drill template support along the Y-axis, and the other end has a sixth hole. The hinged fork-shaped drill template rotates to form a first position and a second position. In the first position, the sixth hole forms a horizontal distance L1 with the inner surface of the right support. In the second position, the fork-shaped drill template is positioned away from the right support. The inner surface of the right support has a third mounting surface, and the clamping body has a positioning mechanism for fixing the piston rod. This invention integrates the guidance of initial hole machining and subsequent finishing machining. After the initial hole machining, the tool is reliably guided by the initial hole and guide sleeve to achieve high-precision fitting machining of reaming and boring.

Description

Technical Field

[0001] This invention relates to the field of aircraft nose landing gear machining technology, and in particular to a piston rod and pin shaft fitting machining device and method. Background Technology

[0002] Landing gear assembly is the most critical stage in the entire landing gear manufacturing process, encompassing assembly, adjustment, inspection, and testing. The assembled aircraft landing gear must meet specified assembly precision. Assembly precision is a crucial factor in landing gear quality indicators and a necessary condition for ensuring normal operating performance. All components of the landing gear have inherent machining tolerances, and the accumulation of these tolerances during assembly affects overall assembly precision.

[0003] To control this cumulative error to not exceed the allowable range specified for assembly accuracy, we cannot rely solely on improving the machining accuracy of each part. For special parts, it is most economical to perform machining during assembly, and machining can also improve the quality of assembly accuracy and achieve a high degree of interchangeability of assembled parts.

[0004] Therefore, it is particularly important to design a high-precision machining device for the piston rod and the pin shaft. Summary of the Invention

[0005] The purpose of this invention is to provide a piston rod and pin assembly machining device and method that can improve the assembly quality of landing gear.

[0006] The technical solution of the present invention is: a piston rod and pin shaft matching processing device, including a clamping body, a drill template support, a fork-shaped drill template, a right support, a semi-circular seat and a pressure plate. The clamping body is provided with a process hole, and the drill template support is installed at a distance L in the Y direction from the process hole. The clamping body is provided with a right support, and the right support is located on the side of the drill template support in the X direction. One end of the fork-shaped drill template is hinged to the drill template support along the Y-axis, and the other end of the fork-shaped drill template is provided with a sixth hole. The hinged fork-shaped drill template rotates to form a first position and a second position. In the first position, the sixth hole forms a horizontal distance L1 with the inner surface of the right support. In the second position, the fork-shaped drill template is placed on the side of the drill template support away from the right support. The inner surface of the right support is provided with a third mounting surface for positioning the pin shaft, and the clamp body is provided with a positioning mechanism for fixing the piston rod. The central axis of the positioning mechanism forms an inclination angle α with the horizontal axis of the process hole.

[0007] Preferably, the fork-shaped drill template is provided with a positioning hole extending in the X direction, and in the first position, the positioning hole forms a vertical distance H with the process hole.

[0008] Preferably, the fork-shaped drill template includes a first arm and a second arm. The lower end of the first arm is connected to the drill template support, and the upper end of the first arm is vertically connected to the second arm. The second arm is provided with a second mounting cavity for placing a positioning pin shaft. The positioning hole is provided on the first arm and communicates with the second mounting cavity. The sixth hole is provided on the side wall forming the second mounting cavity.

[0009] Preferably, a support column is provided between the right support and the drill template support, and the top of the support column is provided with a second mounting surface for positioning the pin shaft.

[0010] Preferably, the right support is provided with a rotating support, and the rotating support is provided with a pressing mechanism, which can output a relative downward force to the third mounting surface.

[0011] Preferably, the pressing mechanism is a clamping screw that is threadedly connected to the rotating support.

[0012] Preferably, the rotating support includes a fifth base plate extending in the Y direction, a vertical plate extending in the Z direction, and a horizontal plate extending in the X direction. The fifth base plate, the vertical plate, and the horizontal plate are connected in sequence. The fifth base plate is hinged to the right support so that the rotating support can rotate to form a third position and a fourth position. A clamping screw is threaded onto the horizontal plate. In the third position, the clamping screw is positioned above the third mounting surface. In the fourth position, the clamping screw is located on the side of the right support away from the third mounting surface.

[0013] Preferably, the piston rod and pin shaft fitting processing device further includes a positioning pin, which, in the first position, is simultaneously inserted into the fork-shaped drill template and the drill template support.

[0014] The present invention also provides a method for machining a piston rod and a pin shaft, which is performed using the above-mentioned piston rod and pin shaft machining device and includes the following steps: Step 1: Fix the fixture onto the machine tool worktable; Step 2: Place the fork-shaped drill template in the second position, fix the piston rod at an angle using the positioning mechanism, and extend the lug of the piston rod into the side of the fork-shaped drill template in the X direction; Step 3: Insert the pin into the lug and place the pin on the third mounting surface; then rotate the fork-shaped drill template to the first position and fix it. Step 4: Apply axial thrust to one end of the fork-shaped drill template to abut against the pin shaft, so that the other end of the pin shaft abuts against the inner surface of the right support. Step 5: Apply downward pressure above the pin shaft, which, together with the third mounting surface, presses the pin shaft tightly; at this time, the ninth hole on the lug, the tenth hole and the sixth hole on the pin shaft are aligned; Step 6: First, install the initial hole drill bushing in the sixth hole to machine the initial hole; then remove the initial hole drill bushing and install the reaming bushing to machine until the sixth hole is machined to the required dimensions. Step 7: Complete the machining process, place the fork-shaped drill template in the second position, and disassemble the piston rod and the pin shaft.

[0015] Preferably, after completing step six, the enlarged sleeve is removed, and the pre-installation guide sleeve is precision machined.

[0016] Compared with related technologies, the beneficial effects of the present invention are as follows: I. This invention designs a fork-shaped drill template, which integrates the guidance for machining the initial hole and the subsequent finishing. After the initial hole is machined, the tool is reliably guided by the initial hole and the guide sleeve to achieve high-precision reaming and boring. Second, this invention reduces the difficulty of device manufacturing by grinding the bushing hole of the drill bushing to make the axis of the drill bushing and guide bushing meet the specified requirements; Third, the invention features a rotatable rotating support, which achieves the purpose of spatially pressing the pin shaft and enables reliable pressing through high-precision machining. Fourth, this invention can reduce the chain links and cumulative errors that affect the assembly accuracy of landing gear, achieve high assembly accuracy, lay a good foundation for subsequent landing gear work, and ensure high-quality and timely delivery of landing gear. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of the piston rod and pin shaft matching processing device provided by the present invention; Figure 2 A front view schematic diagram of the piston rod and pin shaft matching processing device provided by the present invention; Figure 3 A side view of the piston rod and pin shaft fitting processing device provided by the present invention; Figure 4 For along Figure 2 AA section view diagram; Figure 5 For along Figure 2 BB cross-sectional diagram in the middle; Figure 6 For along Figure 3 CC section view diagram; Figure 7 for Figure 1 A schematic diagram of the structure of the fork-shaped drill template; Figure 8 for Figure 1 A schematic diagram of the structure of the drill template support; Figure 9 for Figure 1 A schematic diagram of the structure of the pillars in the diagram; Figure 10 for Figure 1 A schematic diagram of the right support in the middle; Figure 11 for Figure 1 A schematic diagram of the rotating support in the diagram; Figure 12 for Figure 1 A schematic diagram of the semi-cylinder structure in the diagram; Figure 13 for Figure 1 A schematic diagram of the clamping device in the diagram. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0019] like Figure 1 , Figure 2 , Figure 3 As shown, the piston rod and pin shaft fitting processing device provided in this embodiment includes a clamping body 1, a drill template support 2, a hinge pin 3, a first bushing 4, a second bushing 5, a positioning pin 6, a fork-shaped drill template 7, a clamping screw 8, a first pressure block 9, a locking nut 10, a pin 11, a hinge bolt 12, a pressure plate 13, a shoulder nut 14, a third bushing 15, a rotating support 16, a second pressure block 17, a drill bushing 18, a primary hole drill bushing 19, a reaming bushing 20, a front guide sleeve 21, a rear guide sleeve 22, a right support 23, a bolt 24, a support column 26, a lifting eye screw 27, and a semi-circular seat 28.

[0020] like Figure 3 , Figure 13 As shown, the clamping body 1 includes a first base plate 101, a first support 102, a first mounting surface 103, and a process hole 104. The first base plate 101 has a process hole 104 extending in the X direction. One end of the process hole 104 at a distance L in the Y direction is used to mount the drill template support 2. The other end of the first base plate 101 is disposed on the first support 102 extending in the Z direction. The upper end of the first support 102 has an inclined first mounting surface 103. The process hole 104 is a reference hole, facilitating the measurement of the drill sleeve height position, the pin shaft axis position, and the angle of the piston rod after installation. like Figure 1 , Figure 8As shown, the drill template support 2 includes a second base plate 201 and a second support 202 connected to the second base plate 201. The second base plate 201 is mounted on the first base plate 101 by bolts 24. The second support 202 is provided with a first mounting cavity 203, making the second support 202 U-shaped. A first hole 204 and a second hole 205 located below the first hole 204 are provided on the side wall of the U-shape.

[0021] like Figure 7 As shown, the fork-shaped drill template 7 includes a first arm 71 and a second arm 72. The first arm 71 has a third hole 74 and a fourth hole 75 from top to bottom. The upper end of the first arm 71 is vertically connected to the second arm 72, and the second arm 72 has a second mounting cavity 73 for placing a positioning pin shaft. The second mounting cavity 73 makes the second arm 72 form a U-shape. One of the two side walls of the U-shape has a drill sleeve hole 761 in the sixth hole 76, and the other side wall has a rear guide sleeve hole 762 in the sixth hole 76.

[0022] like Figure 6 , Figure 7 As shown, a drill bushing 18 is installed inside the drill bushing hole 761. The outer diameter of the drill bushing 18 is press-fitted with the drill bushing hole 761 of the fork-shaped drill template 7 at H7 / r6. The inner hole of the drill bushing 18 is in a small clearance fit with the initial hole drill bushing 19, the reaming sleeve 20, and the front guide sleeve 21 at F7 / k6. The outer diameter of the rear guide sleeve 22 is press-fitted with the rear guide sleeve hole 762 of the fork-shaped drill template 7 at H7 / r6. The tolerance of the inner hole of the rear guide sleeve 22 is H7. The drill bushing 18 and the rear guide sleeve 22 are guiding elements. Their function is to directly or indirectly guide the tool to perform machining while ensuring their respective positional accuracy, and to maintain a definite position between the workpiece and the tool during machining.

[0023] The first arm 71 is provided with a positioning hole 77 extending in the X direction, which communicates with the second mounting cavity 73. The positioning hole 77 is a threaded hole for connection with the clamping screw 8.

[0024] The fork-shaped structure of the fork-shaped drill template 7 allows the piston rod 29 to be placed in the second mounting cavity 73. The fork-shaped drill template 7 spans the double lugs 291 at the head of the piston rod 29. The fork-shaped drill template 7 integrates the initial hole drilling and tool guidance. After the initial hole is machined, the drill template is installed in place, and after the initial hole is machined, the drill bushing, reaming bushing, front guide bushing, and other guiding tools can be replaced as needed to achieve the finishing of the reaming and boring.

[0025] like Figure 1 , Figure 2As shown, the first arm 71 is placed in the first mounting cavity 203, and the second hole 205 is aligned with the fourth hole 75 and hinged by the hinge pin 3, allowing the fork-shaped drill template 7 to rotate to form a first position and a second position. Figure 4 As shown, a first bushing 4 is provided between the first arm 71 and the hinge pin 3. A second bushing 5 is provided between the second support 202 and the hinge pin 3. The second bushing 5 is a shouldered positioning bushing, fitted with a gap of 0.005~0.02mm, which restricts the displacement freedom of the fork-shaped drill template 7 along the axis of the hinge pin 3, ensuring reliable radial rotation of the fork-shaped drill template 7.

[0026] The outer diameter of the first bushing 4 is in a press fit with the fork-shaped drill template 7 at H7 / r6, and the inner hole of the first bushing 4 is in a clearance fit with the hinge pin 3 and the locating pin 6 at F7 / f6. The function of the first bushing 4 is to improve the service life of the device and facilitate maintenance.

[0027] In the first position, the sixth hole 76 and the inner surface of the right support 23 form a horizontal distance L1, and the positioning hole 77 and the process hole 104 form a vertical distance H, and the positioning hole 77 and the process hole 104 form a horizontal distance L (e.g. Figure 3 (As shown). In the second position, the fork-shaped drill template 7 is placed on the side of the drill template support 2 away from the right support 23.

[0028] In the first position, the first hole 204 is aligned with the third hole 74 and secured by the locating pin 6 (e.g., Figure 4 (As shown).

[0029] like Figure 1 As shown, a support column 26 and a right support 23 are sequentially mounted in the X direction on the first substrate 101, with the support column 26 positioned close to the drill template support 2. Figure 9 As shown, the support column 26 includes a centering step 261, a third base plate 262, and a column 263 arranged sequentially from bottom to top. The centering step 261 is inserted into a hole at a corresponding position on the first base plate 101, and the third base plate 262 is vertically attached to the first base plate 101. The top of the column 263 is provided with a second mounting surface 264. The second mounting surface 264 is a downwardly recessed arc-shaped surface.

[0030] like Figure 1 , Figure 10As shown, the right support 23 includes a fourth base plate 231 and a fourth support 232 disposed on the fourth base plate 231. The fourth base plate 231 is mounted on the corresponding position of the first base plate 101 by bolts 24 and pins 11. One side of the fourth support 232 is a positioning surface 235, which is the inner side near the support column 26. A protrusion is connected to the positioning surface 235, and the upper surface of the protrusion is provided with a third mounting surface 236. The third mounting surface 236 is a downwardly recessed arc-shaped surface. The upper end of the fourth support 232 is provided with a fifth hole 233 and a sixth hole 234.

[0031] like Figure 1 , Figure 11 As shown, the rotating support 16 includes a fifth base plate 161 extending in the Y direction, a vertical plate 162 extending in the Z direction, and a horizontal plate 163 extending in the X direction. The fifth base plate 161, the vertical plate 162, and the horizontal plate 163 are connected in sequence. An eleventh hole 166 is provided at the end of the fifth base plate 161, and a seventh hole 164 is also provided on the rotating support 16, passing through the horizontal plate 163 and the vertical plate 162. The fifth base plate 161 is placed on the fourth support 232 of the right support 23, and the eleventh hole 166 is aligned with the fifth hole 233 and hinged by the hinge shaft 3 (e.g., Figure 5 (As shown). The fifth base plate 161 is hinged to the right support 23, allowing the rotating support 16 to rotate to form a third position and a fourth position. The horizontal plate 163 has two eighth holes 165 that can be threadedly connected to the clamping screws 8. In the third position, the two clamping screws 8 are respectively positioned above the third mounting surface 236 and the second mounting surface 264, and the sixth hole 234 is aligned with the seventh hole 164, and is fixed by the insertion of the locating pin 6 (e.g.). Figure 5 (As shown). In the fourth position, the locating pin 6 is pulled out, and the clamping screw 8 is located on the side of the right support 23 away from the third mounting surface 236.

[0032] like Figure 1 As shown, a clamping screw 8 is threaded into the positioning hole 77, and a first pressure block 9 is provided at the end of the clamping screw 8. The end of the first pressure block 9 is flat and is used to abut against the end face of the pin shaft 30. A second pressure block 17 is provided at the end of the clamping screw 8 threaded into the eighth hole 165. The end of the second pressure block 17 is an upwardly concave arc surface so as to abut against the shaft surface of the pin shaft 30. Locking nuts 10 are threaded onto all three clamping screws 8 to lock the shaft extension length of the clamping screw 8 to provide a suitable clamping force.

[0033] like Figure 12As shown, the semicircular base 28 includes a sixth base plate 281 and a fifth support 282 disposed on the sixth base plate 281. One end of the fifth support 282 has a hinge hole 283. One end of the pressure plate 13 is hinged to the hinge hole 283 via a hinge pin 3. The sixth base plate 181 is fixedly mounted on the corresponding position of the first base plate 101 by bolts 24 and pins 11. The lower surface of the pressure plate 13 has an arc shape adapted to the piston rod 29, and the upper surface of the fifth support 282 has an arc shape adapted to the piston rod 29. The third bushing 15 consists of two semicircles, one of which is mounted on the arc surface of the fifth support 282 by a screw, and the other is mounted on the arc surface of the pressure plate 13 by a screw. The pressure plate 13 is rotatable along the hinge pin 3 to achieve locking or unlocking. The live bolt 12 is hinged to the fifth support 282 via a pin 11. When locking is required, after the pressure plate 13 and the fifth support 282 interlock, the hinge bolt 12 is rotated to the position where it contacts the pressure plate 13, and then the shoulder nut 14 is tightened to achieve locking. After locking, the third bushing 15 clamps the outer wall of the piston rod 29. Loosening the shoulder nut 14 and the hinge bolt 12 allows the pressure plate 13 to be unscrewed to release the piston rod 29.

[0034] Figure 2 The dimension L1 shown is the center distance from the positioning surface 235 to the sixth hole 761. Figure 3 Dimension H is the center height of the drill bushing. L is the dimension from the process hole 104 to the axis of the pin shaft 30. α = 40° is the angle between the center of the piston rod 29 and the horizontal axis of the process hole 104. With these dimensions determined, high-precision machining of the piston rod 29 and the pin shaft 30 can be achieved.

[0035] like Figure 1 As shown, the first base plate 101 of the clamping body 1 is provided with lifting eye screws 27 for hoisting the entire processing device.

[0036] After the fork-shaped drill template 7, rotating support 16, column 26, and right support 23 of the present invention ensure the position of the pin shaft 30, the position value of the piston rod 29 in the device is determined accordingly, which is conducive to the realization of machining.

[0037] The present invention also provides a method for machining a piston rod and a pin shaft, which is performed using the above-mentioned machining device for piston rod and pin shaft, and includes the following steps: Step S1: Fix the fixture 1 onto the machine tool worktable. The oblong holes at both ends of the first base plate 101 in the Y direction are used for fixing to the machine tool worktable.

[0038] Step S2: Remove the locating pins 6 from both positions. Rotate the fork-shaped drill template 7 to the second position, place the rotating support in the fourth position, and place the pressure plate 13 in the open state. Place the piston rod 29 on the fifth support 282. At this time, the axis of the piston rod 29 forms an angle α with the horizontal axis of the process hole 104, where α = 40°.

[0039] Step S3: Insert the pin 30 into the lug 291, and place the outer diameters of both ends of the pin 30 on the second mounting surface 264 and the third mounting surface 236 respectively. Then, place the right end face of the pin 30 (e.g., Figure 2 The right side shown abuts against the positioning surface 235.

[0040] Step S4: Rotate the fork-shaped drill template 7 to the first position and fix it. Insert the positioning pin 6 into the aligned third hole 74 and first hole 204. The fork-shaped drill template 7 is then installed in place.

[0041] Step S5: Rotate the rotating support 16 to the third position and insert the positioning pin 6 into the aligned fifth hole 233 and seventh hole 164.

[0042] Step S6: Tighten the clamping screw 8 in the positioning hole 77 to push the first pressure block 9 against the left end face of the insertion pin 30 (e.g., Figure 2 (As shown on the left). Then, tighten the two clamping screws 8 on the horizontal plate 163 so that they extend downwards, causing the second clamping block 17 to contact the upper surface of the pin shaft 30. At the same time, the second clamping block 17, the second mounting surface 264, and the third mounting surface 236 simultaneously apply clamping force to the pin shaft 30 to lock the pin shaft 30. At this time, the pin shaft 30 is fully positioned and clamped in the processing device.

[0043] In step S7, the pressure plate 13 is screwed to the locked position, and the hinge bolt 12 and the shoulder nut 14 are tightened respectively to fully position and clamp the piston rod 29 in the processing device. At this time, the ninth hole 292 on the lug 291, the tenth hole 301 and the sixth hole 76 on the pin shaft 30 are aligned.

[0044] In step S8, a primary hole drill bushing 19 is installed in the inner hole of the drill bushing 18 in the drill bushing hole 761 to form the primary holes 292 and 301. Then the primary hole drill bushing 19 is removed, and the reaming sleeve 20 is installed in the inner hole of the drill bushing 18. The ninth hole 292 and the tenth hole 301 are then machined until the required dimensions are achieved.

[0045] Step S9: Replace the tool with a guide tool. The guide tool needs to be installed in the inner hole of the rear guide sleeve 22. Remove the reaming sleeve 20 from the drill bushing 18, and install the front guide sleeve 21. At this time, finish machine the ninth hole 292 and the tenth hole 301 until they meet the landing gear installation dimensions. Figure 6The ear piece 291 has two ninth holes 292 formed on it, and the pin shaft 30 has a radially penetrating tenth hole 301 formed on it.

[0046] Step S11: Complete the fitting process, place the fork-shaped drill template 7 in the second position, the rotating support 16 in the fourth position, the pressure plate 13 in the open position, and disassemble the piston rod 29 and the pin shaft 30.

[0047] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A processing device for assembling a piston rod and a pin shaft, characterized in that, The fixture includes a clamping body (1), a drill template support (2), a fork-shaped drill template (7), a right support (23), a semi-circular seat (28), and a pressure plate (13). The clamping body (1) is provided with a process hole (104). The drill template support (2) is installed at a distance L in the Y direction from the process hole (104). The clamping body (1) is provided with a right support (23), which is located on the side of the drill template support (2) in the X direction. One end of the fork-shaped drill template (7) is hinged to the drill template support (2) along the Y-axis. The other end of the fork-shaped drill template (7) is provided with a sixth hole (76). The hinged fork-shaped drill template (7) rotates to form a first position and a second position. In the first position, the sixth hole (76) forms a horizontal distance L1 with the inner surface of the right support (23). In the second position, the fork-shaped drill template (7) is placed on the side of the drill template support (2) away from the right support (23). The inner surface of the right support (23) is provided with a third mounting surface (236) for positioning the pin shaft. The clamping body (1) is provided with a positioning mechanism for fixing the piston rod. The central axis of the positioning mechanism forms an inclined angle α with the horizontal axis of the process hole (104). The fork-shaped drill template (7) is provided with a positioning hole (77) extending in the X direction. In the first position, the positioning hole (77) forms a vertical distance H with the process hole (104). The fork-shaped drill template (7) includes a first arm (71) and a second arm (72). The lower end of the first arm (71) The first arm (71) is connected to the drill template support (2), and the upper end of the first arm (71) is vertically connected to the second arm (72). The second arm (72) is provided with a second mounting cavity (73) for placing the positioning pin shaft. The positioning hole (77) is provided on the first arm (71) and communicates with the second mounting cavity (73). The sixth hole (76) is provided on the side wall forming the second mounting cavity (73). A support column (26) is provided between the right support (23) and the drill template support (2). The top of the support column (26) is provided with a second mounting surface (264) for positioning the pin shaft.

2. The piston rod and pin shaft mating processing device according to claim 1, characterized in that, The right support (23) is provided with a rotating support (16), and the rotating support (16) is provided with a pressing mechanism, which can output a relative downward force to the third mounting surface (236).

3. The piston rod and pin fitting processing device according to claim 2, characterized in that, The pressing mechanism is a clamping screw (8) that is threadedly connected to the rotating support (16).

4. The piston rod and pin fitting processing device according to claim 3, characterized in that, The rotating support (16) includes a fifth base plate (161) extending in the Y direction, a vertical plate (162) extending in the Z direction, and a horizontal plate (163) extending in the X direction. The fifth base plate (161), the vertical plate (162), and the horizontal plate (163) are connected in sequence. The fifth base plate (161) is hinged to the right support (23) so that the rotating support (16) can rotate to form a third position and a fourth position. A clamping screw (8) is threaded on the horizontal plate (163). In the third position, the clamping screw (8) is placed above the third mounting surface (236). In the fourth position, the clamping screw (8) is located on the side of the right support (23) away from the third mounting surface (236).

5. The piston rod and pin shaft mating processing device according to claim 1, characterized in that, It also includes a positioning pin (6), which, in the first position, is simultaneously inserted into the fork-shaped drill template (7) and the drill template support (2).

6. A method for machining a piston rod and a pin shaft, comprising using the machining apparatus for machining a piston rod and a pin shaft as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Fix the fixture (1) onto the machine tool worktable; Step 2: Place the fork-shaped drill template (7) in the second position, fix the piston rod (29) at an angle using the positioning mechanism, and make the lug (291) of the piston rod (29) extend into the side of the fork-shaped drill template (7) in the X direction; Step 3: Insert the pin shaft (30) into the ear piece (291) and place the pin shaft (30) on the third mounting surface (236); then rotate the fork-shaped drill template (7) to the first position and fix it. Step 4: Apply an axial thrust to one end of the fork-shaped drill template (7) to abut against the pin shaft (30), so that the other end of the pin shaft (30) abuts against the inner surface of the right support (23); Step 5: Apply downward pressure above the pin shaft (30), which, together with the third mounting surface (236), presses the pin shaft (30) together; at this time, the ninth hole (292) on the lug (291), the tenth hole (301) and the sixth hole (76) on the pin shaft (30) are aligned; Step 6: First, install the initial hole drill sleeve (19) in the sixth hole (76) to process the initial hole; then remove the initial hole drill sleeve (19), install the reaming sleeve (20) to process, until the sixth hole (76) is processed to the required dimensions. Step 7: Complete the machining process, place the fork-shaped drill template (7) in the second position, and disassemble the piston rod and the pin shaft.

7. The method for machining the piston rod and the pin shaft according to claim 6, characterized in that, After completing step six, remove the enlarged sleeve (20) and install the front guide sleeve (21) for finishing.

Images