A piercing punch for a riveting machine

Abstract

The utility model provides a punch of riveting machine relates to punch puncher technical field, including punch main part, the bottom of punch main body is fixed with connecting piece, the bottom of connecting piece is clamped and is connected with support block, the bottom of support block is fixed with two upper punches, the bottom of upper punch is fixed with lower punch, the junction of upper punch and lower punch is equipped with arc chamfer. Through the setting of upper punch and lower punch, and upper punch is wider, lower punch is narrower, and the diameter of narrower lower punch is slightly smaller than target aperture, is responsible for the preliminary " puncture " work piece, reduces the cutting area of single impact, reduces the blade mouth local stress, and the diameter of wider upper punch is consistent with target aperture, is responsible for " second finishing " to the hole wall after the preliminary punching, avoids the blade mouth local excessive wear, and through the setting of arc chamfer, replaces the traditional right angle transition, disperses the stress concentration when impact, avoids the blade mouth to break, and the practicality is stronger.

Description

Technical Field

[0001] This utility model relates to the field of punching punch technology, and in particular to a punching punch for a riveting machine. Background Technology

[0002] In the field of modern industrial manufacturing, riveting is a highly efficient and reliable connection method that is widely used in many industries such as automotive parts, electronic equipment, home appliances, and hardware components. As a key component for riveting machines to complete the core punching process, the design and application of punches have always revolved around the industrial production demand for efficient and precise processing.

[0003] In a current riveting machine, the punching part at the lower end of the punch is prone to localized cracking or rapid wear due to stress concentration and excessive friction when repeatedly impacting the workpiece. This leads to a decrease in punching accuracy and requires frequent punch replacement, resulting in poor practicality. In addition, the punching part of the existing riveting machine is installed and removed using screws, which is time-consuming, labor-intensive, and has significant limitations. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that in the prior art, the lower end of the punching part of the punch is prone to local cracking or rapid wear due to stress concentration and friction overheating when repeatedly impacting the workpiece, resulting in a decrease in punching accuracy. This leads to the need for frequent punch replacement, and the replacement is done by screws, which is time-consuming and labor-intensive. Therefore, a punching punch for a riveting machine is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a punch for a riveting machine, comprising a punch body, a connector fixed to the bottom end of the punch body, a support block snapped into the bottom end of the connector, two upper punches fixed to the bottom end of the support block, a lower punch fixed to the bottom end of the upper punches, a rounded chamfer at the connection between the upper and lower punches, an installation / removal structure for quickly installing and removing the support block within the connector, and a punch rod above the punch body.

[0006] Preferably, the mounting and dismounting structure includes a motor located on one side of the connector, the output end of the motor passing through one side of the connector and fixed with a screw, a movable plate being threadedly connected to the outer wall of the screw, a first limiting post being slidably connected to the end of the movable plate away from the screw, a connecting block being fixed to the bottom end of the movable plate, and a locking block being fixed to the bottom end of the connecting block passing through the inner top wall of the connector, the locking block being engaged in the support block.

[0007] Preferably, an internal spline is fixed to the top of the punch body, an external spline is provided on the outside of the internal spline, a first rubber pad is fixed to the bottom of the external spline, the bottom of the first rubber pad is fixed to the top of the punch body, a second rubber pad is fixed to the top of the internal spline, and the top of the second rubber pad abuts against the inner top wall of the external spline.

[0008] Preferably, a mounting plate is fixed to the bottom end of the punch rod, and the mounting plate is fixed to the top end of the external spline by bolts.

[0009] Preferably, both ends of the outer wall of the external spline are fixed with limit plates, and each of the two limit plates is slidably connected with a second limit post.

[0010] Preferably, one end of the connector has an opening, and a fixing frame is fixed on the inner wall of the opening, with the motor mounted on one end of the fixing frame.

[0011] Preferably, the end of the screw away from the motor is rotatably connected to the connector, and both ends of the first limiting post are fixed to the connector.

[0012] Preferably, the bottom end of the connector is provided with a slot that matches the support block, and both ends of the support block are fixed with handles.

[0013] Preferably, the inner top wall of the connector is provided with a moving groove that matches the connecting block, and the top of the support block is provided with a slot that matches the locking block.

[0014] Preferably, the bottom end of the second limiting post is fixed to the punch body, and the top end of the second limiting post is fixed with a stop block.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows: In this invention, an upper punch and a lower punch are used, with the upper punch being wider and the lower punch narrower. The narrower lower punch has a diameter slightly smaller than the target hole diameter and is responsible for initially "piercing" the workpiece, reducing the cutting area of ​​a single impact and lowering the local stress on the cutting edge. The wider upper punch has a diameter consistent with the target hole diameter and is responsible for "secondary finishing" of the hole wall after the initial punching, preventing excessive wear on the cutting edge. Furthermore, the use of rounded chamfers replaces the traditional right-angle transition, dispersing stress concentration during impact and preventing the cutting edge from cracking, thus enhancing practicality. The device uses a motor to drive a screw to rotate, causing the moving plate to move under the limit of the first limiting post. This allows the locking block connected to the connecting block to move. When the support block is inserted into the slot at the bottom of the connector, the movement of the locking block allows it to engage with the support block, achieving the effect of installing the support block. When the locking block moves and no longer engages the support block, the user can quickly pull out and disassemble the entire support block, further enhancing its practicality. Attached Figure Description

[0016] Figure 1 A perspective view of a punch for a riveting machine is provided for this utility model; Figure 2 A cross-sectional view of a punch for a riveting machine is provided for this utility model. Figure 3 This utility model provides a schematic diagram of the installation and removal structure of the punching head of a riveting machine; Figure 4 This utility model provides a schematic diagram of the internal structure of the external spline of the punching head of a riveting machine.

[0017] Legend: 1. Punch body; 2. Connector; 3. Locking block; 4. Upper punch; 5. Lower punch; 6. Rounded chamfer; 7. Installation and disassembly structure; 701. Motor; 702. Screw; 703. Moving plate; 704. First limiting post; 705. Connecting block; 706. Locking block; 8. Moving groove; 9. Slot; 10. Fixing bracket; 11. Slot; 12. Handle; 13. Internal spline; 14. External spline; 15. First rubber pad; 16. Second rubber pad; 17. Mounting plate; 18. Bolt; 19. Punch rod; 20. Limiting plate; 21. Second limiting post; 22. Stop; 23. Opening. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example 1, as Figure 1-4 As shown, this utility model provides a punch for a riveting machine, including a punch body 1, a connector 2 fixed to the bottom end of the punch body 1, a support block 3 snapped into the bottom end of the connector 2, two upper punches 4 fixed to the bottom end of the support block 3, a lower punch 5 fixed to the bottom end of the upper punches 4, a rounded chamfer 6 provided at the connection between the upper punches 4 and the lower punch 5, an installation and removal structure 7 for quick installation and removal of the support block 3 provided in the connector 2, and a punch rod 19 provided above the punch body 1.

[0021] The overall effect of embodiment 1 is that, through the operation of the installation and disassembly structure 7, the support block 3 can be quickly installed and disassembled, thereby enabling the rapid replacement of the upper punch 4 and lower punch 5 connected to the bottom of the support block 3. The upper punch 4 is wider and the lower punch 5 is narrower. The diameter of the narrower lower punch 5 is slightly smaller than the target hole diameter, which is responsible for the initial "piercing" of the workpiece, reducing the cutting area of ​​a single impact and reducing the local stress on the cutting edge. The wider upper punch 4 has the same diameter as the target hole diameter, which is responsible for the "secondary finishing" of the hole wall after the initial punching, avoiding excessive wear of the cutting edge. Furthermore, the use of a rounded chamfer 6 replaces the traditional right-angle transition, dispersing the stress concentration during impact and preventing the cutting edge from cracking, thus enhancing its practicality.

[0022] Example 2, as Figure 1-4 As shown, the mounting and disassembly structure 7 includes a motor 701 located on one side of the connector 2. The output end of the motor 701 passes through one side of the connector 2 and is fixed with a screw 702. A movable plate 703 is threaded onto the outer wall of the screw 702. A first limiting post 704 is slidably connected to the end of the movable plate 703 away from the screw 702. A connecting block 705 is fixed to the bottom end of the movable plate 703. The bottom end of the connecting block 705 passes through the inner top wall of the connector 2 and is fixed with a locking block 706. The locking block 706 is engaged in the support block 3. An inner spline 13 is fixed to the top of the punch body 1. An outer spline 14 is provided on the outer side of the inner spline 13. A first rubber pad 15 is fixed to the bottom end of the outer spline 14. The bottom end of the first rubber pad 15 is fixed to the top end of the punch body 1. A second rubber pad 16 is fixed to the top end of the inner spline 13. The top end of the second rubber pad 16 abuts against the inner top wall of the outer spline 14. An installation rod 19 is fixed to the bottom end of the punch rod 19. Plate 17 is fixed to the top of the outer spline 14 by bolts 18. Limiting plates 20 are fixed to both ends of the outer wall of the outer spline 14. Second limiting posts 21 are slidably connected inside the two limiting plates 20. One end of the connector 2 has an opening 23. A fixing frame 10 is fixed on the inner wall of the opening 23. The motor 701 is installed at one end of the fixing frame 10. The end of the screw 702 away from the motor 701 is rotatably connected to the connector 2. Both ends of the first limiting post 704 are fixed to the connector 2. The bottom end of the connector 2 has a slot 9 that matches the support block 3. Both ends of the support block 3 have handles 12. The inner top wall of the connector 2 has a moving groove 8 that matches the connector 705. The top of the support block 3 has a slot 11 that matches the locking block 706. The bottom end of the second limiting post 21 is fixed to the punch body 1. The top end of the second limiting post 21 is fixed with a stop block 22.

[0023] The effect achieved by the entire embodiment 2 is that the operation of the motor 701 drives the screw 702 to rotate, causing the moving plate 703 to move under the limit of the first limiting post 704, thereby driving the locking block 706 connected to the connecting block 705 to move. When the support block 3 is inserted into the slot 9 opened at the bottom of the connector 2, the movement of the locking block 706 allows it to engage the support block 3, achieving the effect of installing the support block 3. When the locking block 706 moves and no longer engages the support block 3, the user can quickly pull out and disassemble the support block 3 as a whole, making it more practical. Through the setting of the first rubber pad 15 and the second rubber pad 16, during punching, the reaction force of the punch body 1 is transmitted through the first rubber pad 15 and the second rubber pad 16. 6. By absorbing vibration energy through its own compression and rebound, the impact of the impact force on the punch rod 19 is reduced. The connection between the inner spline 13 and the outer spline 14 ensures the coaxiality of the punch body 1 and the punch rod 19, avoiding eccentric impact caused by vibration. The small gap between the teeth of the inner spline 13 and the outer spline 14 can also compensate for the small displacement of the first rubber pad 15 and the second rubber pad 16 after compression, without affecting the punching stroke, thus improving practicality. The punch body 1 located below the punch rod 19 can be replaced as a whole by setting the mounting plate 17 and the bolts 18. The distance of movement of the outer spline 14 can be limited by setting the limiting plate 20, the second limiting post 21 and the stop block 22, thus preventing the outer spline 14 from moving upward and separating from the inner spline 13, thus improving stability.

[0024] Working principle: When in use, the external punch rod 19 moves, causing the punch body 1 to descend, which in turn causes the upper punch 4 and lower punch 5 to descend and perform punching. The upper punch 4 is wider and the lower punch 5 is narrower, with the diameter of the narrower lower punch 5 being slightly smaller than the target hole diameter, which is responsible for the initial "piercing". The workpiece is designed to reduce the cutting area of ​​a single impact, thereby reducing local stress on the cutting edge. The wider upper punch 4, with a diameter matching the target hole diameter, is responsible for "secondary finishing" of the hole wall after initial punching, preventing excessive wear on the cutting edge. Furthermore, the use of a rounded chamfer 6 replaces the traditional right-angle transition, dispersing stress concentration during impact and preventing cutting edge breakage, thus enhancing practicality. The device, driven by a motor 701, rotates the screw 702, causing the moving plate 703 to move under the limit of the first limiting post 704. This, in turn, moves the locking block 706 connected to the connecting block 705. When the support block 3 is inserted into the slot 9 at the bottom of the connecting piece 2, the movement of the locking block 706 engages the support block 3, achieving the effect of installing the support block 3. As the locking block 706 moves... When the support block 3 is no longer engaged, the user can quickly pull out and disassemble the support block 3 as a whole, making it more practical. With the setting of the first rubber pad 15 and the second rubber pad 16, the reaction force of the punch body 1 is transmitted through the first rubber pad 15 and the second rubber pad 16 during punching. The first rubber pad 15 and the second rubber pad 16 absorb vibration energy through their own compression and rebound, reducing the impact of the impact force on the punch rod 19. With the setting of the inner spline 13 and the outer spline 14, the connection of the inner spline 13 and the outer spline 14 not only ensures the coaxiality of the punch body 1 and the punch rod 19, avoiding eccentric impact caused by vibration, but also compensates for the small displacement of the first rubber pad 15 and the second rubber pad 16 after compression through the small gap of the tooth surface of the inner spline 13 and the outer spline 14, without affecting the punching stroke, making it more practical.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A punch for a riveting machine, comprising a punch body (1), characterized in that: The bottom end of the punch body (1) is fixed with a connector (2), the bottom end of the connector (2) is snapped with a support block (3), the bottom end of the support block (3) is fixed with two upper punches (4), the bottom end of the upper punches (4) is fixed with a lower punch (5), the connection between the upper punches (4) and the lower punches (5) is provided with an arc chamfer (6), the connector (2) is provided with a disassembly and assembly structure (7) for quick disassembly and assembly of the support block (3), and a punch rod (19) is provided above the punch body (1); the disassembly and assembly structure (7) includes a component located on the connector (2) The motor (701) on the side has its output end passing through one side of the connector (2) and fixed with a screw (702). A movable plate (703) is threadedly connected to the outer wall of the screw (702). A first limiting post (704) is slidably connected to one end of the movable plate (703) away from the screw (702). A connecting block (705) is fixed to the bottom end of the movable plate (703). The bottom end of the connecting block (705) passes through the inner top wall of the connector (2) and is fixed with a locking block (706). The locking block (706) is locked in the support block (3).

2. The punching head of a riveting machine according to claim 1, characterized in that: The top of the punch body (1) is fixed with an internal spline (13), and an external spline (14) is provided on the outside of the internal spline (13). A first rubber pad (15) is fixed at the bottom of the external spline (14). The bottom of the first rubber pad (15) is fixed to the top of the punch body (1). A second rubber pad (16) is fixed at the top of the internal spline (13). The top of the second rubber pad (16) abuts against the inner top wall of the external spline (14).

3. The punching head of a riveting machine according to claim 1, characterized in that: The bottom end of the punch (19) is fixed with a mounting plate (17), which is fixed to the top end of the external spline (14) by bolts (18).

4. The punching head of a riveting machine according to claim 2, characterized in that: Both ends of the outer wall of the external spline (14) are fixed with limit plates (20), and each of the two limit plates (20) is slidably connected with a second limit post (21).

5. The punching head of a riveting machine according to claim 1, characterized in that: One end of the connector (2) has an opening (23), and a fixing frame (10) is fixed on the inner wall of the opening (23). The motor (701) is installed at one end of the fixing frame (10).

6. The punching head of a riveting machine according to claim 1, characterized in that: The end of the screw (702) away from the motor (701) is rotatably connected to the connector (2), and both ends of the first limiting post (704) are fixed to the connector (2).

7. The punching head of a riveting machine according to claim 1, characterized in that: The bottom end of the connector (2) is provided with a slot (9) that matches the support block (3), and both ends of the support block (3) are fixed with handles (12).

8. The punching head of a riveting machine according to claim 1, characterized in that: The inner top wall of the connector (2) is provided with a moving groove (8) that matches the connecting block (705), and the top of the support block (3) is provided with a slot (11) that matches the locking block (706).

9. The punching head of a riveting machine according to claim 4, characterized in that: The bottom end of the second limiting post (21) is fixed to the punch body (1), and the top end of the second limiting post (21) is fixed with a stop block (22).

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