A punch forming device for a piston pin

Abstract

The application discloses a punch forming device for a piston pin, which comprises a punch die composed of a movable die set and a fixed die set, the punch die is respectively provided with a cutting mechanism and a stripping mechanism at the front and back ends along a conveying direction, a plurality of punch mechanisms are arranged between the cutting mechanism and the stripping mechanism, and a mechanical clamp is arranged between the movable die set and the fixed die set in the punch mechanism; the cutting mechanism comprises a material lifting part on the movable die set and a discharging barrel on the fixed die set, and a cutting part is arranged between the material lifting part and the discharging barrel; the cutting part comprises a clamping block, a cutter is detachably connected to the middle part of the clamping block, one end of the cutter extends to the outside of the clamping block and forms a clamping groove, spring sheets that are detachably connected to the clamping block are arranged on the outside of the clamping groove, one end of the spring sheet is provided with a clamping part matched with the clamping groove, and the other end of the spring sheet is detachably connected to the clamping block; and a jacking rod is slidably connected to the clamping block. The punch forming device has the characteristics of high processing efficiency and good stamping stability.

Description

Technical Field

[0001] This invention relates to a piston pin stamping die, and more particularly to a piston pin stamping forming apparatus. Background Technology

[0002] Currently, the main processing method for cylindrical piston pins is direct stamping using a stamping die, similar to that in patent 202210998428.4. This die includes a sequentially arranged cutting mechanism, a multi-stage stamping mechanism, and a stripping mechanism, enabling the piston pin to be formed in a single stamping operation. During the stamping process, the piston pin is clamped and conveyed in a step-by-step manner by mechanical clamps, allowing the piston pins at each station to sequentially enter the next station after each process. However, this stamping die has several drawbacks in practical use:

[0003] Firstly, in the cutting process of piston pin blanks, a positioning mechanism is needed to push and limit the end of the round bar to facilitate control of the cutting length. This positioning mechanism mainly consists of a fixed frame and a positioning shaft. The positioning shaft is slidably connected to the fixed frame in the horizontal direction and is axially limited by a set screw, allowing the extension position of the positioning shaft to be adjusted and fixed according to the blank size. However, this structure has two drawbacks. On the one hand, the extension position of the positioning shaft needs to be accurately controlled during installation. However, existing positioning shafts rely on manual extension and retraction for positioning, making it difficult to finely adjust the axial position of the positioning shaft, thus increasing the positioning difficulty for installers. On the other hand, to ensure the stability of the blank during the cutting process, the positioning shaft also needs to fully compress the round bar and apply a certain amount of compressive force during cutting. However, since the fixed frame and positioning shaft are limited only by the set screw, the positioning shaft is prone to axial movement after being subjected to the compressive force from the round bar for a long time, which reduces the fixing effect of the positioning shaft after long-term use.

[0004] Secondly, the current method of cutting round bars involves applying shearing force to the protruding end of the bar after the cutter moves laterally. This method causes the cutter to interfere with the clamping position of the mechanical clamp during the lateral movement. In other words, the protruding end of the round bar cannot be cut while it is being held by the mechanical clamp. Instead, a special transfer tool is needed to transfer the blank to the mechanical clamp after cutting, which increases the complexity of the equipment and reduces its processing efficiency.

[0005] Thirdly, the current method for unloading piston pins in the unloading mechanism involves first moving the piston pin to the unloading position using mechanical clamps, and then having the piston pin directly pushed off the mechanical clamps by a discharge rod on one side, allowing it to fall freely downwards. However, this method of directly pushing out the piston pin causes it to fall naturally downwards after detaching from the clamps, with some axial movement during the fall due to the pushing action. Furthermore, during the unloading process, one end of the piston pin detaches from the mechanical clamps first and falls, while the other end detaches later and flips over, making it difficult for the piston pin to remain horizontal during the fall, resulting in arbitrary flipping. Due to these limitations, manufacturers find it difficult to control the falling position and the shape of the piston pins after they fall, making continuous online conveying impossible. Instead, the piston pins must be dropped into a transfer box after stamping, and then manually placed onto the post-processing device by operators, reducing processing efficiency and increasing labor costs.

[0006] Fourthly, the existing stamping die punch structure has a discharge port on its side wall to discharge accumulated material. This discharge port is connected to the inner hole of the punch, allowing the accumulated material to be discharged from the discharge port under the pushing force of subsequent accumulated material, thus realizing the discharge of waste material. However, the drawback of this punch is that, due to the influence of the stamping die and the size of the accumulated material, the wall thickness of the punch is relatively thin. This results in a significant reduction in the punch's strength and resistance to deformation after the discharge port on one side of the punch is connected to the inner hole. Consequently, when the punch is pushed against the workpiece, it is easy for the punch to bend and deform at the discharge port, reducing the working stability and service life of the punch. On the other hand, to ensure stable discharge of accumulated material, the width of the discharge port must be consistent with the diameter of the inner hole of the punch. This requires that half of the side wall at the discharge port be completely cut off when the discharge port is opened, further aggravating the damage to the structural strength of the punch, making the punch prone to deformation problems in later use.

[0007] Therefore, existing stamping dies for piston pins suffer from low processing efficiency and poor stamping stability. Summary of the Invention

[0008] The purpose of this invention is to provide a stamping forming apparatus for piston pins. It features high processing efficiency and good stamping stability.

[0009] The technical solution of the present invention: A stamping forming device for piston pins, comprising a stamping die composed of a moving die group and a fixed die group, wherein a cutting mechanism and a stripping mechanism are respectively provided at the front and rear ends of the stamping die along the conveying direction, and a plurality of stamping mechanisms are provided between the cutting mechanism and the stripping mechanism, wherein a mechanical clamp is provided in the stamping mechanism between the moving die group and the fixed die group; the cutting mechanism includes a top part located on the moving die group and a discharge cylinder located on the fixed die group, and a cutting part is provided between the top part and the discharge cylinder, the cutting part including a clamping block, a cutter detachably connected to the middle of the clamping block, one end of the cutter extending to the outside of the clamping block and forming a clamping groove, a spring plate detachably connected to the clamping block is provided on the outside of the clamping groove, one end of the spring plate is provided with a locking part that matches the clamping groove, and the other end of the spring plate is detachably connected to the clamping block; a top rod is slidably connected to the clamping block.

[0010] In the aforementioned piston pin stamping forming device, the cutter on one side of the clamping groove is provided with a long groove, and the clamping block is provided with an opening for the mating groove on one side.

[0011] In the aforementioned piston pin stamping forming device, the clamping block is provided with a snap-fit ​​groove, and the spring sheet is snapped into the snap-fit ​​groove at the end away from the snap-fit ​​part. A first set screw is connected to the clamping block on one side of the spring sheet, and the end of the first set screw extends into the snap-fit ​​groove and fits against the spring sheet.

[0012] In the aforementioned piston pin stamping forming device, the ejector part includes a fixed frame located on the moving module. The fixed frame is provided with a through positioning hole. A positioning shaft is slidably connected to the positioning hole. One end of the positioning shaft extends to the outside of the fixed frame and is connected to a stop pin. The end of the stop pin extends to the outside of the positioning shaft and forms a limiting surface. The fixed frame inside the positioning hole is provided with a threaded groove. An extrusion cylinder is threadedly connected to the threaded groove. One end of the extrusion cylinder is in contact with the positioning shaft.

[0013] In the aforementioned piston pin stamping forming device, one end of the positioning shaft is provided with a stepped portion extending into the threaded groove, and a gap is left between the outer wall of the stepped portion and the inner wall of the threaded groove.

[0014] In the aforementioned piston pin stamping forming device, a second set screw is threadedly connected to one side of the fixing frame. One end of the second set screw is in contact with the positioning shaft, and a clamping groove that cooperates with the second set screw is provided on one side of the positioning shaft.

[0015] In the aforementioned piston pin stamping forming device, the extrusion cylinder is provided with a polygonal cross-section operating groove in the middle.

[0016] In the aforementioned piston pin stamping forming device, the end of the positioning shaft is fastened to a stop pin, and a third set screw that engages with the stop pin is provided on one side of the positioning shaft.

[0017] In the aforementioned piston pin stamping forming device, the stripping mechanism includes an interceptor located on the side of the mechanical clamp away from the fixed mold group. The interceptor forms a downward through-hole on the side near the clamping groove. A sliding hole is provided on the inner side of the through-hole. A vertical intercepting surface is formed between the sliding hole and the through-hole. A guide shaft is slidably connected in the sliding hole. The end of the guide shaft passes through the sliding hole and the through-hole in sequence and extends into the clamping groove.

[0018] In the aforementioned piston pin stamping forming device, the mechanical clamp has a discharge rod that is slidably connected to the fixed die on the side away from the interceptor.

[0019] In the aforementioned piston pin stamping forming device, one end of the interceptor is bolted to a mounting plate, and the mounting plate is provided with an elongated hole for the bolt to pass through.

[0020] In the aforementioned piston pin stamping forming device, an inclined guide plate is provided below the blanking port, and a discharge hole with the same cross-sectional shape as the piston pin is provided at the lower end of the guide plate.

[0021] In the aforementioned piston pin stamping forming device, the stamping mechanism includes a mounting sleeve located on the moving die. A front punch is detachably connected to the end of the mounting sleeve. The front punch and the mounting sleeve are nested inside and out and interlocked with each other. A through feed hole is provided on the inner side of the front punch. A first slide rail connecting the front punch is provided on the inner side of the mounting sleeve. A discharge port is provided on the mounting sleeve inside the first slide rail. The inner end of the discharge port is connected to the first slide rail, and the outer end of the discharge port is connected to the outside.

[0022] In the aforementioned piston pin stamping forming device, one end of the mounting sleeve is provided with a clamping sleeve, the middle of the clamping sleeve is provided with a through-hole, one end of the clamping hole passes through the clamping sleeve and extends to the middle of the mounting sleeve, and the clamping sleeves on both sides of the clamping hole are respectively provided with through holes and threaded holes, and the through holes and threaded holes are connected to each other by fixing screws.

[0023] In the aforementioned piston pin stamping forming device, the clamping sleeve is cubic in shape, the mounting sleeve and the clamping sleeve are integrally formed, one end of the discharge port is set on the mounting sleeve, and the other end of the discharge port extends to the clamping sleeve.

[0024] In the aforementioned piston pin stamping forming device, the inner side of the mounting sleeve is provided with a second slide that connects to the first slide. The discharge port is located on one side of the second slide. A push rod is slidably connected inside the second slide. One end of the front punch extends through the first slide into the second slide. One end of the push rod is in contact with the front punch. A strip-shaped discharge groove that matches the discharge port is provided on one side of the push rod. The width of the strip-shaped discharge groove is the same as that of the discharge port.

[0025] In the aforementioned piston pin stamping forming device, a fourth set screw that matches the front punch is connected to one side of the mounting sleeve.

[0026] Compared with the prior art, the present invention has the following characteristics:

[0027] (1) The present invention achieves accurate adjustment of the axial position of the positioning shaft by means of the structural cooperation between the positioning shaft and the extrusion cylinder. The positioning shaft can be fixed after positioning by means of the cooperation between the positioning shaft and the second set screw, so as to prevent the positioning shaft from moving outward. Under the above cooperation, the extrusion cylinder can bear the extrusion force on the stop pin and prevent the stop pin from moving axially after being subjected to force, thereby improving the fixing effect of the present invention.

[0028] (2) By matching the structure of the positioning shaft and the stop pin, the lateral movement range of the limiting surface can be effectively increased; that is, when the axial position of the limiting surface needs to be adjusted slightly, the axial position of the positioning shaft can be adjusted by the extrusion cylinder. When the axial position of the limiting surface changes significantly, it can be adjusted by replacing the stop pin with a different length specification, thereby effectively expanding the scope of application of the present invention and reducing the adjustment cost of the limiting surface.

[0029] (3) Through the structural cooperation of the clamping block, the cutter and the spring plate, after the cutter cuts the round bar, the cutter and the spring plate can clamp it and the clamping block can transport it to the next station, thereby realizing the functions of clamping, cutting and feeding of the round bar, effectively improving the processing efficiency of the piston pin; through the structural cooperation of the spring plate and the push rod, the spring plate can also be pushed outward during clamping, thereby realizing the clamping function of the round bar without changing the height of the clamping block; through the cooperation of the groove and the opening on the clamping block, the lateral movement position of the clamping block can also be limited, thereby ensuring that the clamping block is transported to the correct position after lateral movement;

[0030] (4) Through the cooperation of mechanical clamps, interceptors and guide shafts, the piston pin on the mechanical clamps can move axially along the guide shaft into the discharge port after being pushed. Then the guide shaft is retracted so that the piston pin falls down along the discharge port after losing support. This allows the piston pin to be in a designated position when it falls and prevents the piston pin from changing from horizontal to vertical during the falling process, effectively improving the stability of the piston pin when discharging.

[0031] (5) By setting the guide plate, the piston pin can be guided after it falls, so that the piston pin can fall into the conveying device below in a horizontal state and fixed direction, further improving the stability of the piston pin when it is discharged, and enabling continuous conveying of the piston pin.

[0032] (6) Through the structural cooperation of the mounting sleeve and the front punch, the discharge port can be transferred from the front punch to the mounting sleeve. Only the feed hole for the accumulated material to pass through needs to be set at the front punch, thereby greatly improving the stress strength and deformation resistance of the front punch. At the same time, since the mounting sleeve has a relatively higher hardness and will not be subjected to the squeezing force from the push rod during use, the structural stability of the mounting sleeve during use can be guaranteed. On this basis, by limiting the structure of the clamping block, it is also possible to squeeze and limit the front punch after it is inserted, thereby ensuring the installation stability and discharge effect of the front punch.

[0033] (7) By limiting the shape and connection structure of the push rod, the push rod can also limit the extension position of the front punch after installation, thereby ensuring the stability of the front punch during the stamping process; on the other hand, after the material is discharged from the front punch, it can also enter the discharge port through the strip discharge groove, thereby improving the discharge stability of the material and avoiding the material from getting stuck in the second slide.

[0034] Therefore, the present invention has the characteristics of high processing efficiency and good stamping stability. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the cutting mechanism;

[0037] Figure 3 This is a front view of the cutting section in the clamping state;

[0038] Figure 4 This is a front view of the cutting section with the spring plates open.

[0039] Figure 5 yes Figure 3 It is a rear view;

[0040] Figure 6 This is a schematic diagram of the unloading mechanism;

[0041] Figure 7 This is a diagram showing the connection structure between the interceptor and the guide plate;

[0042] Figure 8 This is a diagram of the connection structure of the forward punch;

[0043] Figure 9 yes Figure 8 Sectional view along direction A.

[0044] The labels in the attached diagram are as follows: 1-moving module, 2-fixed module, 3-cutting mechanism, 4-unloading mechanism, 5-stamping mechanism, 6-mechanical clamp, 7-discharge cylinder, 8-clamping block, 9-cutting blade, 10-clamping groove, 11-spring plate, 12-push rod, 13-groove, 14-opening, 15-fastening groove, 16-first set screw, 17-fixed bracket, 18-positioning hole, 19-positioning shaft, 20-stop pin, 21-extrusion cylinder, 22-interceptor, 23-discharge port, 24-sliding hole, 25-guide shaft, 26-discharge rod, 27-guide plate, 28-mounting sleeve, 29-front punch, 30-feed hole, 31-first slide rail, 32-discharge port, 33-clamping sleeve, 34-pressing port, 35-second slide rail, 36-push rod, 37-strip discharge groove. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0046] Example. A piston pin stamping forming apparatus, configured as follows: Figure 1 As shown, a stamping die includes a moving die group 1 and a fixed die group 2. The stamping die has a cutting mechanism 3 and a stripping mechanism 4 at its front and rear ends along the conveying direction, respectively. Several stamping mechanisms 5 are located between the cutting mechanism 3 and the stripping mechanism 4. Each stamping mechanism 5 contains a mechanical clamp 6 located between the moving die group 1 and the fixed die group 2. This mechanical clamp 6 is a conventional mechanical clamp 6 with clamping and translational conveying functions. The cutting mechanism 3 includes a top-loading part located on the moving die group 1 and a discharge cylinder 7 located on the fixed die group 2. A [missing information - likely a design feature] is provided between the top-loading part and the discharge cylinder 7. The device includes a cutting section comprising a clamping block 8, a transverse movement mechanism connected to the outside of the clamping block 8, a cutter 9 screwed to the middle of the clamping block 8, one end of the cutter 9 extending to the outside of the clamping block 8 and forming a clamping groove 10, a spring plate 11 detachably connected to the clamping block 8 provided on the outside of the clamping groove 10, one end of the spring plate 11 having a locking part that engages with the clamping groove 10, and the other end of the spring plate 11 being detachably connected to the clamping block 8; a push rod 12 is slidably connected to the clamping block 8, one end of the push rod 12 extending to the outside of the clamping block 8 and used to push the spring plate 11 outward.

[0047] The cutter 9 on one side of the clamping groove 10 is provided with a long groove 13, and the clamping block 8 is provided with an opening 14 that matches the groove 13 on one side.

[0048] The engaging part is L-shaped, and a clamping cavity is formed between the engaging part and the clamping groove 10 for clamping the protruding end of the round bar.

[0049] The clamping block 8 is provided with a long strip-shaped fastening groove 15 that extends through one end. The spring sheet 11 forms a U-shaped structure at the end away from the locking part and is fastened and connected in the fastening groove 15. A first set screw 16 is connected to the clamping block 8 on one side of the spring sheet 11. The end of the first set screw 16 extends into the fastening groove 15 and fits against the spring sheet 11.

[0050] The top material part includes a fixed frame 17 located on the moving module 1. The fixed frame 17 is provided with a through positioning hole 18. A positioning shaft 19 is slidably connected to the positioning hole 18. One end of the positioning shaft 19 extends to the outside of the fixed frame 17 and is detachably connected to a stop pin 20. The end of the stop pin 20 extends to the outside of the positioning shaft 19 and forms a limiting surface. The fixed frame 17 inside the positioning hole 18 is provided with a threaded groove. The inner diameter of the threaded groove is larger than that of the positioning hole 18. An extrusion cylinder 21 is threadedly connected inside the threaded groove. One end of the extrusion cylinder 21 is in contact with the positioning shaft 19.

[0051] One end of the positioning shaft 19 is provided with a stepped portion extending into the threaded groove, and a gap is left between the outer wall of the stepped portion and the inner wall of the threaded groove.

[0052] One side of the fixing bracket 17 is threadedly connected to a second set screw. One end of the second set screw is in contact with the positioning shaft 19. One side of the positioning shaft 19 is provided with a clamping groove that cooperates with the second set screw.

[0053] The extrusion cylinder 21 has a polygonal cross-section operating groove in the middle. When operating, the operator can insert the tool into the operating groove and drive the extrusion cylinder 21 to rotate.

[0054] The end of the positioning shaft 19 is fastened to the stop pin 20. After insertion, the stop pin 20 fits against the inner end face of the positioning shaft 19. A third set screw that engages with the stop pin 20 is provided on one side of the positioning shaft 19.

[0055] The unloading mechanism 4 includes an interceptor 22 located on the side of the mechanical clamp 6 away from the fixed module 2. The interceptor 22 forms a downward through-hole 23 on the side near the clamping groove 10. The width of the through-hole 23 is not less than the outer diameter of the piston pin. A sliding hole 24 is provided on the inner side of the through-hole 23. A vertical intercepting surface is formed between the sliding hole 24 and the through-hole 23. A guide shaft 25 is slidably connected in the sliding hole 24. The end of the guide shaft 25 extends into the clamping groove 10 by passing through the sliding hole 24 and the through-hole 23 in sequence.

[0056] The mechanical clamp 6 has a discharge rod 26 that is slidably connected to the fixed module 2 on the side away from the interceptor 22.

[0057] One end of the interceptor 22 is bolted to a mounting plate, which has an elongated hole for the bolt to pass through. The elongated hole allows the interceptor 22 to be adjusted in lateral position as needed during installation.

[0058] Below the discharge port 23, there is an inclined guide plate 27. The lower end of the guide plate 27 is provided with a discharge hole that is consistent with the cross-sectional shape of the piston pin. A bent part is provided on one side of the discharge hole at the end of the guide plate 27. A conveyor belt for subsequent processing devices can be installed below the discharge hole.

[0059] The stamping mechanism 5 includes a mounting sleeve 28 located on the moving module 1. A front punch 29 is detachably connected to the end of the mounting sleeve 28. The front punch 29 and the mounting sleeve 28 are nested inside and out and interlocked with each other. The inner side of the front punch 29 is provided with a through feed hole 30. The inner side of the mounting sleeve 28 is provided with a first slide rail 31 connecting the front punch 29. The mounting sleeve 28 inside the first slide rail 31 is provided with a discharge port 32. The inner end of the discharge port 32 is connected to the first slide rail 31, and the outer end of the discharge port 32 is connected to the outside.

[0060] One end of the mounting sleeve 28 is provided with a clamping sleeve 33, and the middle of the clamping sleeve 33 is provided with a through-hole clamping port 34. One end of the clamping port 34 passes through the clamping sleeve 33 and extends to the middle of the mounting sleeve 28. The clamping sleeves 33 on both sides of the clamping port 34 are respectively provided with through holes and threaded holes, and the through holes and threaded holes are connected to each other by fixing screws.

[0061] The clamping sleeve 33 is cubic in shape. The mounting sleeve 28 and the clamping sleeve 33 are integrally formed. One end of the discharge port 32 is set on the mounting sleeve 28, and the other end of the discharge port 32 extends to the clamping sleeve 33.

[0062] The inner side of the mounting sleeve 28 is provided with a second slide 35 that connects to the first slide 31. The diameter of the second slide 35 is larger than that of the first slide 31 and forms a stepped surface with the first slide 31. The discharge port 32 is located on one side of the second slide 35, and the end of the discharge port 32 is flush with the first slide 31. A push rod 36 is slidably connected inside the second slide 35. One end of the front punch 29 passes through the first slide 31 and extends into the second slide 35. One end of the push rod 36 is in contact with the front punch 29, and the other end of the push rod 36 extends to the outside of the mounting sleeve 28 and is connected to the drive component. A strip-shaped discharge groove 37 that matches the discharge port 32 is provided on one side of the push rod 36. The width of the strip-shaped discharge groove 37 is the same as that of the discharge port 32.

[0063] The fourth set screw that mates with the front punch 29 is connected to one side of the mounting sleeve 28.

[0064] The working principle of this invention is as follows: When installing the top part, the stop pin 20 is first fully inserted into the positioning shaft 19 and then fixed with the third set screw. Next, the positioning shaft 19 is inserted into the positioning hole 18 and then screwed into the extrusion cylinder 21. This allows the extrusion cylinder 21 to push against the positioning shaft 19 after being screwed in, thereby achieving the positioning of the limiting surface by adjusting the screw-in position of the extrusion cylinder 21. After the positioning shaft 19 is positioned, the second set screw is screwed in to fix it. This ensures that the stop pin 20 maintains its pushing position under the cooperation of the positioning shaft 19, the extrusion cylinder 21, and the fixing frame 17, improving the positioning effect of this invention on round bar billets.

[0065] During stamping, the discharge cylinder 7 first ejects the round bar, causing its end to align with the limiting surface of the stop pin 20. Then, the push rod 12 pushes the spring plate 11 outward, causing the engaging part to rotate above the round bar, thus preventing the engaging part from colliding with the round bar during lateral movement. After the engaging part rotates into position, the clamping block 8 and the push rod 12 move laterally together until they engage with the side wall of the round bar in the clamping groove 10, with the engaging part located on the other side of the round bar. Then, the push rod 12 retracts, causing the engaging part to spring back and press against the round bar, thereby clamping the round bar in conjunction with the clamping groove 10 on the other side. After the round bar is clamped, the clamping block 8 drives the cutter 9 to move laterally to the next station, so that the cutter 9 applies shearing force to the protruding end of the round bar during the movement, thereby cutting off the protruding end of the round bar and forming a blank. After cutting, the blank remains clamped by the engaging part and the clamping groove 10 and moves to the next station with the clamping block 8.

[0066] During the movement of clamping block 8, stop pin 20 enters groove 13. When stop pin 20 is in contact with the inner wall of opening 14, the blank is in the next station of stamping mechanism 5, and is pushed into fixed mold group 2 for subsequent processing by stamping mechanism 5. At the same time, clamping block 8 moves laterally to reset. When stamping mechanism 5 cuts off the excess material in the inner hole of piston pin blank, push rod 36 pushes front punch 29 to squeeze the outer end of piston pin blank, so that fixed punch on the other side cuts the accumulated material and sends it into feed hole 30. After entering feed hole 30, the accumulated material can move inward under the push of subsequent accumulated material and enter strip discharge groove 37, and then fall directly out from discharge port 32 directly below, realizing the discharge of accumulated material.

[0067] After the piston pin is stamped, a mechanical clamp moves it to the unloading position. Then, a guide shaft 25 moves it axially to the inner hole of the piston pin, creating a nested arrangement. The discharge rod 26 on the other side then pushes the piston pin out of the mechanical clamp and into the unloading port 23 on one side along the guide shaft 25. When the piston pin is in contact with the intercepting surface, the guide shaft 25 retracts and disengages from the piston pin. Then, the discharge rod 26 retracts, causing the piston pin to slide downwards along the unloading port 23 after losing its compression limit, thus completing the unloading process. After falling, the piston pin slides downwards along the guide plate 27. When it reaches the discharge port, the piston pin, under inertia, contacts the bending part for angle correction and then falls along the discharge port onto the conveyor belt below, achieving continuous conveying of the piston pin.

Claims

1. A stamping forming device for piston pins, characterized in that: The stamping die includes a moving die (1) and a fixed die (2). A cutting mechanism (3) and a stripping mechanism (4) are respectively provided at the front and rear ends of the stamping die along the conveying direction. Several stamping mechanisms (5) are provided between the cutting mechanism (3) and the stripping mechanism (4). Each stamping mechanism (5) contains a mechanical clamp (6) located between the moving die (1) and the fixed die (2). The cutting mechanism (3) includes a top-loading part on the moving die (1) and a discharge cylinder (7) on the fixed die (2). A cutting section is provided between the cylinders (7). The cutting section includes a clamping block (8). A cutter (9) is detachably connected to the middle of the clamping block (8). One end of the cutter (9) extends to the outside of the clamping block (8) and forms a clamping groove (10). A spring plate (11) is detachably connected to the clamping block (8) on the outside of the clamping groove (10). One end of the spring plate (11) is provided with a locking part that matches the clamping groove (10). The other end of the spring plate (11) is detachably connected to the clamping block (8). A push rod (12) is slidably connected to the clamping block (8). The cutter (9) on one side of the clamping groove (10) is provided with a long groove (13), and the clamping block (8) is provided with an opening (14) that matches the groove (13) on one side. The clamping block (8) is provided with a fastening groove (15). The spring sheet (11) is fastened and connected in the fastening groove (15) at the end away from the locking part. A first set screw (16) is connected on the clamping block (8) on one side of the spring sheet (11). The end of the first set screw (16) extends into the fastening groove (15) and fits against the spring sheet (11).

2. The stamping forming device for piston pins according to claim 1, characterized in that: The top material part includes a fixed frame (17) located on the moving module (1). The fixed frame (17) is provided with a through positioning hole (18). A positioning shaft (19) is slidably connected to the positioning hole (18). One end of the positioning shaft (19) extends to the outside of the fixed frame (17) and is connected to a stop pin (20). The end of the stop pin (20) extends to the outside of the positioning shaft (19) and forms a limiting surface. The fixed frame (17) inside the positioning hole (18) is provided with a threaded groove. An extrusion cylinder (21) is threadedly connected to the threaded groove. One end of the extrusion cylinder (21) is in contact with the positioning shaft (19).

3. The stamping forming apparatus for piston pins according to claim 2, characterized in that: The end of the positioning shaft (19) is fastened to the stop pin (20), and a third set screw that matches the stop pin (20) is provided on one side of the positioning shaft (19).

4. The stamping forming apparatus for piston pins according to claim 1, characterized in that: The unloading mechanism (4) includes an interceptor (22) located on the side of the mechanical clamp (6) away from the fixed module (2). The interceptor (22) forms a downward through-hole (23) on the side near the clamping groove (10). A sliding hole (24) is provided on the inner side of the through-hole (23). A vertical intercepting surface is formed between the sliding hole (24) and the through-hole (23). A guide shaft (25) is slidably connected in the sliding hole (24). The end of the guide shaft (25) passes through the sliding hole (24) and the through-hole (23) and extends into the clamping groove (10).

5. The stamping forming apparatus for piston pins according to claim 4, characterized in that: The mechanical clamp (6) has a discharge rod (26) that is slidably connected to the fixed module (2) on the side away from the interceptor (22).

6. The stamping forming apparatus for piston pins according to claim 1, characterized in that: The stamping mechanism (5) includes a mounting sleeve (28) located on the moving module (1). The end of the mounting sleeve (28) is detachably connected to a front punch (29). The front punch (29) and the mounting sleeve (28) are nested inside and out and interlocked with each other. The inner side of the front punch (29) is provided with a through feed hole (30). The inner side of the mounting sleeve (28) is provided with a first slide rail (31) connecting the front punch (29). The mounting sleeve (28) inside the first slide rail (31) is provided with a discharge port (32). The inner end of the discharge port (32) and the first slide rail (31) are interconnected. The outer end of the discharge port (32) is interconnected with the outside.

7. The stamping forming apparatus for piston pins according to claim 6, characterized in that: One end of the mounting sleeve (28) is provided with a clamping sleeve (33), and the middle of the clamping sleeve (33) is provided with a through-hole (34). One end of the clamping hole (34) passes through the clamping sleeve (33) and extends to the middle of the mounting sleeve (28). The clamping sleeve (33) on both sides of the clamping hole (34) is provided with a through hole and a threaded hole respectively. The through hole and the threaded hole are connected to each other by a fixing screw.

8. A stamping forming apparatus for piston pins according to claim 6, characterized in that: The inner side of the mounting sleeve (28) is provided with a second slide (35) that connects to the first slide (31). The discharge port (32) is located on one side of the second slide (35). A push rod (36) is slidably connected in the second slide (35). One end of the front punch (29) passes through the first slide (31) and extends into the second slide (35). One end of the push rod (36) is in contact with the front punch (29). A strip-shaped discharge groove (37) that matches the discharge port (32) is provided on one side of the push rod (36).

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