Vertical tooling and method for diesel crosshead pin boring

Abstract

A vertical tooling and method for diesel engine crosshead pin boring machine processing, the vertical tooling includes a base plate, a workpiece clamping mechanism, a positioning assembly, an adjustable support and a clamp locking mechanism; wherein the base plate is fixed on the machine tool workbench, the workpiece clamping mechanism is arranged on the base plate, used for clamping and positioning the crosshead pin workpiece, including quick-change base, four zero quick-change unit modules, pull pin conversion block and pull pin, the positioning assembly is arranged between the base plate and the workpiece clamping mechanism, used for positioning the workpiece clamping mechanism, including base positioning pin and base positioning sleeve, the adjustable support is connected to the base plate, the position of the workpiece clamping mechanism is adjusted by rotating, the clamp locking mechanism is arranged on the base plate, including four locking assemblies, the workpiece clamping mechanism is clamped and locked from four directions. The invention adopts zero quick-change unit module, realizes the rapid clamping and positioning of the workpiece, saves the auxiliary time, improves the processing efficiency, eliminates the quality hidden danger, and guarantees the personal safety.

Description

Technical Field

[0001] This invention relates to the machining process of diesel engines, and more particularly to a vertical tooling and method for machining crosshead pins of diesel engines on a boring machine, belonging to the field of diesel engine manufacturing technology. Background Technology

[0002] The crosshead pin is an important precision component of marine low-speed diesel engines. It is mainly used to connect the connecting rod and the piston rod, and has sliders installed at both ends. Guided by the frame guide plate, it moves up and down reciprocally by the piston rod, which drives the connecting rod and the crankshaft to rotate, thereby propelling the ship forward and backward. Therefore, the crosshead pin is a key moving connection component of the diesel engine.

[0003] like Figure 1 As shown, the crosshead pin of a marine low-speed diesel engine is a large cylindrical component with a maximum diameter of 1000mm, a length of 1500mm, and a maximum weight exceeding 6 tons. Its outer diameter contacts the bearing shell and is a crucial friction pair in the diesel engine. The roughness of the large outer diameter 1 must meet mirror-like requirements with a surface finish of Ra 0.05 or less. The cylindricity and runout of the outer diameter must be less than 0.02mm, and the parallelism between the piston rod mounting surface 2 and the center of the large outer diameter 1 must be within 0.02mm. The crosshead pin is a high-precision component of a marine low-speed diesel engine. The circumference of the large outer diameter 1 of the crosshead pin is provided with the piston rod mounting surface 2, a positioning groove for slider positioning, and oil holes for lubrication of the crosshead pin's rotation, etc. (See...) Figure 1 The machining of these parts usually involves placing the crosshead pin with one end face 3 facing down on a boring machine.

[0004] Traditional clamping arrangements, such as Figure 2 and Figure 3 As shown. Place the leveling block 5 on the machine tool worktable 4, and then place the crosshead pin vertically on the leveling block 5. First, use the pressure plate 6, bolt 7 and pressure plate support 8 to slightly press the workpiece. Straighten the workpiece according to the upper and lower outer diameters of the crosshead pin by inserting copper foil between the crosshead pin and the leveling block 5. Then tighten the pressure plate 6 by tightening the bolt 7, and start machining the piston rod mounting surface 2 on the front and the holes, grooves and other parts on it. After that, loosen the pressure plate 6, hoist the workpiece to the back facing the machine tool, and re-correct, tighten and set the program zero position. Then machine the parts that need to be machined on the back and sides. When machining the grooves and holes on the side, the tool may interfere with the pressure plate support 8 and bolt 7. During this process, it is necessary to remove part of the pressure plate 6 before machining.

[0005] The existing clamping and machining methods for the aforementioned crosshead pins mainly rely on the traditional method of clamping with pressure plates. Due to the workpiece's height, the workload for operators in preparing tooling and clamping is substantial, and clamping and aligning the workpiece is extremely inconvenient, involving multiple clamping operations. This results in extremely high labor intensity for the operator. Furthermore, because the operator must stand on the workbench throughout the process, and the workbench area is limited and the surface is often greasy, there is a risk of accidental falls and other personal safety hazards. Additionally, after the workpiece changes position, the zero position needs to be reset due to the change in location, and multiple zero-position settings may cause product quality issues. Moreover, the existing traditional pressure plate clamping method interferes with the machining operations on the outer diameter of the crosshead pin, requiring the pressure plate to be disassembled and reassembled during machining, thus increasing the operator's workload and affecting machining efficiency. In short, the existing clamping and machining methods have the drawbacks of high labor intensity, low work efficiency, numerous safety hazards, and unreliable quality. Summary of the Invention

[0006] The purpose of this invention is to solve the drawbacks of traditional clamping methods that use pressure plates and bolts and require multiple assembly steps. It provides a vertical fixture and method for machining crosshead pins on a boring machine, enabling rapid clamping of the crosshead pin workpiece. Simultaneously, it ensures that the workpiece zero position remains unchanged after changing workstations, reducing auxiliary work time such as repeated assembly and multiple workpiece zero position settings. This reduces labor intensity, eliminates safety hazards, ensures product quality, and improves the overall machining efficiency of crosshead pins on the boring machine.

[0007] The technical solution of this invention is:

[0008] A vertical fixture for machining crosshead pins in diesel engines, mounted on the machine tool table of the boring machine, is characterized in that: the vertical fixture comprises:

[0009] A base plate is fixed to the machine tool worktable, and the base plate is provided with four base plate guide grooves arranged in a cross shape;

[0010] A workpiece clamping mechanism for clamping and positioning the crosshead pin includes a quick-change base, four zero-point quick-change unit modules, four pull pin conversion blocks, and four pull pins. The quick-change base is concentrically arranged above the base plate. The four zero-point quick-change unit modules are symmetrically fixed on the quick-change base. The module opening air inlet and module pressurization air inlet, which are provided on the peripheral wall of the quick-change base, are connected to an external compressed air source. The pull pin conversion blocks are threaded to the end face of the crosshead pin. The pull pins are threaded to the pull pin conversion blocks and are detachably embedded in the zero-point quick-change unit modules to achieve positioning and clamping of the crosshead pin.

[0011] A positioning component for positioning the workpiece clamping mechanism includes a base positioning pin and a base positioning sleeve. The base positioning pin is fixed to the base plate, and the base positioning sleeve is fixed to the lower side of the quick-change base and fitted into the base positioning pin for positioning the quick-change base.

[0012] An adjustable support is provided between the quick-change base and the base plate. The adjustable support is threaded to the base plate and the position of the quick-change base can be adjusted by rotation.

[0013] The clamping locking mechanism is disposed on the base plate and includes four locking components, which are respectively disposed in the base plate guide groove and can move therein. The four locking components clamp and lock the quick-change base from four directions.

[0014] Furthermore, the locking assembly includes a base inclined support, a handle, a front positioning block, a rear positioning block, a lead screw nut, a lead screw, and a base pressure plate;

[0015] The base inclined support is located at the inner end of the base plate guide groove and below the quick-change base, and is used to support the quick-change base. The handle is connected to the outer end of the base inclined support and is used to pull the base inclined support to slide in the base plate guide groove. The front positioning block is fixed in the base plate guide groove on the outside of the base inclined support. The rear positioning block is fixed at the outermost end of the base plate guide groove. The lead screw is rotatably mounted on the rear positioning block and the front positioning block. The lead screw nut is threadedly connected to the lead screw and is located in the base plate guide groove between the front positioning block and the rear positioning block. The base pressure plate is fixed on the lead screw nut and can slide in the base plate guide groove.

[0016] The rotation of the lead screw drives the base pressure plate to move inward along the guide groove of the base plate through the lead screw nut, thereby clamping and locking the quick-change base between the base pressure plate and the base inclined support.

[0017] Furthermore, the upper side of the base inclined support is an inclined surface that gradually rises from the inside to the outside, and the lower side of the front part of the base pressure plate is an inclined surface that gradually decreases from the front to the back.

[0018] Furthermore, the embedded zero-point quick-change unit module is arranged at a 90° right angle on the quick-change base.

[0019] Furthermore, the adjustable support has small holes on its circumference for rotating the adjustable support.

[0020] Furthermore, the quick-change base is provided with air holes inside, which are respectively connected to the module's open air inlet and the module's pressurized air inlet, as well as the embedded zero-point quick-change unit module.

[0021] Furthermore, the zero-point quick-change unit module is normally in a clamping state. When compressed air is introduced through the air inlet of the module, the zero-point quick-change unit module switches to a released state. When the compressed air is disconnected, it returns to the clamping state. When compressed air is introduced through the pressurized air inlet of the module, the zero-point quick-change unit module increases the clamping force.

[0022] Another technical solution of the present invention is:

[0023] A method for machining a crosshead pin for a diesel engine on a boring machine using the above-mentioned vertical fixture includes the following steps:

[0024] 1) Fixture installation - Fix the assembled vertical fixture onto the machine tool worktable of the boring machine. Connect the module's open air inlet and module pressurized air inlet to an external compressed air source. Rotate the screws of each locking component to make the base pressure plate retract to the loosened state. Use the handle to pull the bottom inclined support backward to make the quick-change base fall down and rest on the adjustable support.

[0025] 2) Workpiece clamping – First, screw the rivet conversion block and the rivet onto the bottom end face of the crosshead pin, and hoist the whole assembly above the vertical fixture. Then, open the air inlet through the module to connect compressed air, so that the zero-point quick-change unit module is in the loose state. Next, place the crosshead pin on the quick-change base, and embed the rivet conversion block and the rivet into the zero-point quick-change unit module. Then, disconnect the compressed air to lock the rivet in the zero-point quick-change unit module, thus completing the workpiece clamping.

[0026] 3) Workpiece adjustment - Adjust the generatrix of the crosshead pin by machine tool calibration, measure the upper and lower taper of the outer circle of the crosshead pin, and then rotate the adjustable support to adjust the height of the four corners of the quick-change base to correct the center line of the crosshead pin to be perpendicular to the table surface of the machine tool.

[0027] 4) Clamping – Manually push the base inclined support under the quick-change base with the handle until appropriate force is applied, then rotate the screw to move the base pressure plate forward until the four sides of the quick-change base are locked between the base pressure plate and the base inclined support, thus completing the final clamping of the vertical fixture and the crosshead pin.

[0028] 5) Machining the machined part on the front of the crosshead pin, and after completion, opening the air inlet through the module to connect compressed air, and loosening the zero-point quick-change unit module;

[0029] 6) Lift the crosshead pin, rotate it 180° and then place it back onto the quick-change base. The pull pin conversion block and the pull pin are embedded in the zero-point quick-change unit module. Then disconnect the compressed air to lock the pull pin in the zero-point quick-change unit module, and clamp the workpiece again. Then process the machining part on the back of the crosshead pin.

[0030] 7) After all processing is completed, open the air inlet through the module to connect compressed air, loosen the zero-point quick-change unit module, lift off the crosshead pin and remove the pull stud and pull stud conversion block on the bottom end face, and then proceed to the next processing step.

[0031] Furthermore, in steps 2) and 6), if the crosshead pin is heavy, has a high center of gravity, or has a high processing force point, compressed air is introduced into the module's pressurization inlet to increase the clamping force.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1) The vertical fixture is easy to operate. The workpiece is automatically locked by pneumatics, eliminating the need for a pressure plate to clamp it forcefully. This saves the workload of preparing pressure plates, pads, bolts, and other fixtures in the traditional method, reducing the workload of the operator and lowering the labor intensity.

[0034] 2) This invention introduces the zero-point quick-change unit module into the processing field of large parts such as low-speed diesel engines, realizing the rapid clamping and positioning of large parts. The coordinate positions of the four clamping points of the vertical tooling are fixed and arranged in a right-angle system, which can realize zero-point positioning. After changing the work position by 90° or 180°, there is no need to reset the zero position. While reducing the workload, it also reduces the quality risk caused by setting the zero position multiple times.

[0035] 3) The vertical fixture clamps the workpiece by relying on the bottom end face, and there is no machining interference problem in all directions. It completely avoids the problem of having to disassemble and reassemble the pressure plate and reset the workpiece zero position again when machining the outer circle part in the traditional way. It ensures that the zero position of all parts in the same batch is consistent, saves the auxiliary time of resetting the zero position after each clamping, and greatly improves the work efficiency. This invention is especially suitable for similar workpieces that need to be machined on the outside.

[0036] 4) The vertical fixture avoids the work of repeatedly disassembling and assembling the pressure plate, and personnel do not need to climb onto the machine tool table to work, so the safety factor is high and personal safety hazards are reduced.

[0037] In summary, this invention enables rapid clamping and positioning of workpieces, saves auxiliary time, improves processing efficiency, eliminates potential product quality risks, and ensures the personal safety of operators, achieving convenient, efficient, high-quality, and safe results. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the crosshead pin.

[0039] Figure 2 This is a diagram showing the traditional crosshead pin clamping configuration.

[0040] Figure 3 yes Figure 2 Top view.

[0041] Figure 4 This is a structural diagram of a vertical tooling fixture.

[0042] Figure 5 This is an assembly drawing of a vertical tooling.

[0043] Figure 6 This is a structural sectional view of the vertical tooling.

[0044] Figure 7 This is a schematic diagram of the piping system for connecting crosshead pins.

[0045] Figure 8 This is a diagram showing the overall clamping state of the crosshead pin.

[0046] In the diagram, 1—large outer circle, 2—piston rod mounting surface, 3—end face, 4—machine tool worktable, 5—leveling pad, 6—pressure plate, 7—bolt, 8—pressure plate support, 9—base plate, 10—adjustable support, 11—base positioning pin, 12—base positioning sleeve, 13—quick-change base, 14—base inclined support, 15—base plate guide groove, 16—handle, 17—front positioning block, 18—lead screw nut, 19—base pressure plate, 20—lead screw, 21—rear positioning block, 22—zero-point quick-change unit module, 23—module open air inlet, 24—module pressurized air inlet, 25—pull pin conversion block, 26—pull pin. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this should not be construed as limiting the scope of protection of the present invention.

[0048] This invention is used for machining crosshead pins of diesel engines on a boring machine. It mainly includes a set of vertical fixtures installed on the boring machine for quickly clamping the crosshead pins and quickly adjusting the workpiece. After overall clamping, the workpiece is machined. After changing the machining position, it can also achieve quick clamping, and the zero position of the workpiece remains unchanged.

[0049] Example

[0050] The vertical fixture is mounted on the machine tool worktable 4 of the boring machine. Please refer to the relevant documentation. Figure 4 , Figure 5 and Figure 6The main components include: base plate 9, adjustable support 10, base positioning pin 11, base positioning sleeve 12, quick-change base 13, base inclined support 14, base plate guide groove 15, handle 16, front positioning block 17, lead screw nut 18, base pressure plate 19, lead screw 20, rear positioning block 21, and zero-point quick-change unit module 22.

[0051] The composition of the connection between the crosshead pin and the vertical tooling is described in [the following text is missing]. Figure 7 It mainly includes: tack converter block 25 and tack 26.

[0052] The assembly relationship of the vertical tooling (e.g.) Figure 4 , Figure 5 and Figure 6 As shown): First, the base plate 9 is installed on the machine tool worktable 4. Then, the adjustable support 10 is installed on the base plate 9 via a threaded connection. By rotating the small hole on the circumference of the adjustable support 10, the height position of the adjustable support 10 can be adjusted using the thread, thereby enabling the workpiece to be adjusted at the four corners of the quick-change base 13. The base positioning pin 11 is installed on the base plate 9, and the base positioning sleeve 12 passes through the base positioning pin 11 and is fixed on the base plate 9 for positioning the quick-change base 13. The quick-change base 13 is positioned on the adjustable support 10 by the base positioning sleeve 12.

[0053] The base inclined support 14 is pushed into the lower part of the quick-change base 13 through the base plate guide groove 15 to support the quick-change base 13. The handle 16 is installed on the end face of the base inclined support 14 for adjusting its front and rear position. The front positioning block 17 is installed in the base plate guide groove 15, and the lead screw nut 18 is installed below the base pressure plate 19 and is placed into the base plate guide groove 15 together with the base pressure plate 19. Behind the front positioning block 17, the lead screw 20 passes through the lead screw nut 18 and is positioned by the front positioning block 17. The rear positioning block 21 is installed in the base plate guide groove 15, behind the base pressure plate 19, for fixing the lead screw 20.

[0054] The zero-point quick-change unit module 22 is installed on the quick-change base 13. Under normal conditions, the zero-point quick-change unit module 22 is in a clamped state. When the air inlet 23 of the module is opened to connect to the factory compressed air source, the zero-point quick-change unit module 22 is released. When the air source is connected through the pressurized air inlet 24 of the module, the clamping force of the zero-point quick-change unit module 22 is increased, and the pressurized air inlet 24 of the module is connected to the zero-point quick-change unit module 22 through the air hole inside the quick-change base 13.

[0055] The assembly relationship between the crosshead pin and the vertical tooling, such as... Figure 7As shown: Install the rivet conversion block 25 onto the end face 3 at the bottom of the crosshead pin via a threaded connection, ensuring a tight fit without gaps. Then, screw the rivet 26 into the rivet conversion block 25 via a thread. Finally, hoist the crosshead pin to the top of the vertical fixture, open the air inlet 23 of the module to introduce compressed air, and open the zero-point quick-change unit module 22. Align the rivet 26 at the bottom of the crosshead pin with the center of the zero-point quick-change unit module 22, lower it, and then disconnect the air supply from the open air inlet 23 of the module. This completes the installation of the crosshead pin.

[0056] The working principle of the vertical fixture: The use of this vertical fixture mainly involves three steps: workpiece clamping, workpiece adjustment, and fixture clamping. Please refer to the relevant documentation. Figure 4 , Figure 5 and Figure 6 The detailed operating steps and working principle are as follows:

[0057] Workpiece clamping: Before the crosshead pin falls onto the vertical fixture, rotate the lead screws 20 in all directions to loosen the base pressure plate 19. Then, use the handle 16 to pull the bottom inclined support 14 backward, allowing the quick-change base 13 to fall onto the adjustable support 10. Next, hoist the crosshead pin (with pull studs 26 at the bottom) onto the vertical fixture. Connect compressed air through the module's air inlet 23, open the zero-point quick-change unit module 22, and then place the crosshead pin onto the quick-change base 13. The pull stud conversion block 25 and pull studs 26 will then embed into the zero-point quick-change unit module 22. Disconnect the compressed air, thus locking the pull studs 26 into the zero-point quick-change unit module 22, thereby clamping the workpiece. If the workpiece is heavy, has a high center of gravity, or the processing force point is high, compressed air can be introduced into the module's pressurized air inlet 24 to increase the clamping force.

[0058] Workpiece adjustment: The crosshead pin generatrix is ​​adjusted by machine tool and the upper and lower taper of the outer circle is measured. The adjustable support 10 is used to correct the workpiece so that the center line of the crosshead pin is perpendicular to the table surface.

[0059] Clamping: Manually push the base inclined support 14 under the quick-change base 13 until appropriate force is applied, then rotate the screw 20 again to move the base pressure plate 19 forward, so that the four sides of the quick-change base 13 are pressed between the base inclined support 14 and the base pressure plate 19, thus achieving final clamping of the clamp.

[0060] First, process the workpiece on the front side (piston rod mounting surface) of the crosshead pin. After completion, open the air inlet 23 through the module to connect compressed air, open the zero-point quick-change unit module 22, and the workpiece can be lifted, rotated 180°, lowered again, and clamped. Then, process the workpiece on the back side of the crosshead pin. After all is completed, release the zero-point quick-change unit module 22, lift the workpiece, and remove the pull stud 26 and pull stud conversion block 25 at the bottom of the crosshead pin. The workpiece can then proceed to the next processing step.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection claimed by the present invention should also include obvious variations and alternatives to the present invention.

Claims

1. A vertical fixture for machining crosshead pins in diesel engines, mounted on the machine tool table of the boring machine, characterized in that: The vertical fixture includes: A base plate is fixed to the machine tool worktable, and the base plate is provided with four base plate guide grooves arranged in a cross shape; A workpiece clamping mechanism for clamping and positioning the crosshead pin includes a quick-change base, four zero-point quick-change unit modules, four pull pin conversion blocks, and four pull pins. The quick-change base is concentrically arranged above the base plate. The four zero-point quick-change unit modules are symmetrically fixed on the quick-change base. The module opening air inlet and module pressurization air inlet, which are provided on the peripheral wall of the quick-change base, are connected to an external compressed air source. The pull pin conversion blocks are threaded to the end face of the crosshead pin. The pull pins are threaded to the pull pin conversion blocks and are detachably embedded in the zero-point quick-change unit modules to achieve positioning and clamping of the crosshead pin. A positioning component for positioning the workpiece clamping mechanism includes a base positioning pin and a base positioning sleeve. The base positioning pin is fixed to the base plate, and the base positioning sleeve is fixed to the lower side of the quick-change base and fitted into the base positioning pin for positioning the quick-change base. An adjustable support is provided between the quick-change base and the base plate. The adjustable support is threaded to the base plate and the position of the quick-change base can be adjusted by rotation. The clamping locking mechanism is disposed on the base plate and includes four locking components, which are respectively disposed in the base plate guide groove and can move therein. The four locking components clamp and lock the quick-change base from four directions. The locking assembly includes a base inclined support, a handle, a front positioning block, a rear positioning block, a lead screw nut, a lead screw, and a base pressure plate; The base inclined support is located at the inner end of the base plate guide groove and below the quick-change base, and is used to support the quick-change base. The handle is connected to the outer end of the base inclined support and is used to pull the base inclined support to slide in the base plate guide groove. The front positioning block is fixed in the base plate guide groove on the outside of the base inclined support. The rear positioning block is fixed at the outermost end of the base plate guide groove. The lead screw is rotatably mounted on the rear positioning block and the front positioning block. The lead screw nut is threadedly connected to the lead screw and is located in the base plate guide groove between the front positioning block and the rear positioning block. The base pressure plate is fixed on the lead screw nut and can slide in the base plate guide groove. The rotation of the lead screw drives the base pressure plate to move inward along the guide groove of the base plate through the lead screw nut, thereby clamping and locking the quick-change base between the base pressure plate and the base inclined support; The upper side of the base inclined support is an inclined surface that gradually rises from the inside to the outside, and the lower side of the front part of the base pressure plate is an inclined surface that gradually decreases from the front to the back.

2. The vertical fixture for machining crosshead pins in diesel engines according to claim 1, characterized in that: The four zero-point quick-change unit modules are arranged at a 90° right angle on the quick-change base.

3. The vertical fixture for machining crosshead pins in diesel engines according to claim 1, characterized in that: The adjustable support has small holes on its circumference for rotating it.

4. The vertical fixture for machining crosshead pins in diesel engines according to claim 1, characterized in that: The quick-change base has internal air holes that connect the zero-point quick-change unit module to the module's open air inlet and pressurized air inlet.

5. The vertical fixture for machining crosshead pins in diesel engines according to claim 1, characterized in that: The zero-point quick-change unit module is normally in a clamping state. When compressed air is introduced through the air inlet of the module, the zero-point quick-change unit module switches to a released state. When the compressed air is disconnected, it returns to the clamping state. When compressed air is introduced through the pressurized air inlet of the module, the zero-point quick-change unit module increases the clamping force.

6. A method for machining a diesel engine crosshead pin on a boring machine using the vertical tooling described in any one of claims 1-5, characterized in that: The processing method includes the following steps: 1) Fixture installation: Fix the assembled vertical fixture onto the machine tool worktable of the boring machine. Connect the module's open air inlet and module pressurized air inlet to an external compressed air source. Rotate the screws of each locking component to make the base pressure plate retract to the loosened state. Use the handle to pull the base inclined support backward to make the quick-change base fall down and rest on the adjustable support. 2) Workpiece clamping: First, screw the rivet conversion block and the rivet onto the bottom end face of the crosshead pin, and hoist the whole assembly above the vertical fixture. Then, open the air inlet through the module to connect compressed air, so that the zero-point quick-change unit module is in the loose state. Next, place the crosshead pin on the quick-change base, and embed the rivet conversion block and the rivet into the zero-point quick-change unit module. Then, disconnect the compressed air to lock the rivet in the zero-point quick-change unit module, thus completing the workpiece clamping. 3) Workpiece adjustment: Adjust the generatrix of the crosshead pin by machine tool calibration, measure the upper and lower taper of the outer circle of the crosshead pin, and then rotate the adjustable support to adjust the height of the four corners of the quick-change base to correct the center line of the crosshead pin to be perpendicular to the table surface of the machine tool. 4) Clamping: Push the base inclined support under the quick-change base by manually pulling the handle until appropriate force is applied, then rotate the screw to move the base pressure plate forward until the four sides of the quick-change base are locked between the base pressure plate and the base inclined support, thus completing the final clamping of the vertical fixture and the crosshead pin. 5) Machining the machined part on the front of the crosshead pin, and after completion, opening the air inlet through the module to connect compressed air, and loosening the zero-point quick-change unit module; 6) Lift the crosshead pin, rotate it 180° and then place it back onto the quick-change base. The pull pin conversion block and the pull pin are embedded in the zero-point quick-change unit module. Then disconnect the compressed air to lock the pull pin in the zero-point quick-change unit module, and clamp the workpiece again. Then process the machining part on the back of the crosshead pin. 7) After all processing is completed, open the air inlet through the module to connect compressed air, loosen the zero-point quick-change unit module, lift off the crosshead pin and remove the pull stud and pull stud conversion block on the bottom end face, and then proceed to the next processing step.

7. The method for machining a crosshead pin for a diesel engine on a boring machine according to claim 6, characterized in that: In steps 2) and 6), if the crosshead pin is too heavy, or its center of gravity is too high, or the processing force point is too high, compressed air is introduced into the pressurized air inlet of the module to increase the clamping force.

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