Feeding device and punching machine
By designing an automated feeding device and using elastic parts and guide surfaces to optimize the sliding action, the problem of traditional riveting feeding relying on manual operation is solved, efficient and precise riveting automation is achieved, and production efficiency and product quality are improved.
Patent Information
- Application Number
- CN202422230662.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-09-10
AI Technical Summary
The feeding process in the traditional riveting process relies on manual operation, which limits production efficiency and the degree of automation, and affects product quality stability and precise matching.
A feeding device was designed, including a movable die set and a fixed die set. The elastic parts and guide surfaces cooperated to realize the automatic transmission and riveting of riveted sheets. The 45° angle guide surface was used to optimize the sliding action, and the spring energy storage and release were combined to achieve efficient automatic feeding.
It improves the automation level of the riveting process, improves production efficiency and product quality, reduces labor intensity and error rate, and ensures the high precision and stability of riveted parts.
Smart Images
Figure CN223312888U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of riveting, in particular to a feeding device and a punching machine. Background Art
[0002] Riveted parts are assemblies made by joining two or more parts together through a riveting process. They are widely used in the fields of machinery, electronics, automotive, aviation, and other fields. Riveting is an important metal joining technology that creates protrusions or depressions in the material to achieve a secure connection between parts. In traditional riveting processes, the feeding process is often performed manually or in a step-by-step automated manner, which limits the continuity and automation of the entire production process. Utility Model Content
[0003] The main purpose of the utility model is to provide a feeding device and a punching machine, aiming to improve the problem of low efficiency of manual riveting.
[0004] To achieve the above-mentioned object, the feeding device proposed in the present invention is used to convey a riveted sheet, wherein the riveted sheet is provided with a plurality of riveted holes spaced apart and arranged side by side, and the feeding device comprises: a movable die group, wherein the movable die group comprises a movable die, a first pressure rod, and a second pressure rod, wherein the first pressure rod and the second pressure rod are arranged on the movable die; the first pressure rod is provided with a first guide surface; a fixed die group, wherein the fixed die group comprises a fixed die, a slide, a pusher, and a first elastic member; the movable die can move toward or away from the fixed die, and a feeding channel for the riveted sheet to pass through is formed between the fixed die and the movable die;
[0005] The slide is slidably provided on the fixed mold and is capable of moving relative to the fixed mold along a first linear direction; the slide is provided with a second guide surface corresponding to the first guide surface and having a shape adapted to the first guide surface;
[0006] The ejector is elastically connected to the slide seat and is correspondingly arranged with the second pressure rod; the ejector can extend into any of the riveting holes of the riveting sheet in the feeding channel;
[0007] The first elastic member is provided on the fixed mold member and is connected to the slide seat; the first elastic member is used to apply a force along the first linear direction to the slide seat.
[0008] In one embodiment, the included angle between the first guide surface and the horizontal plane is defined as α, where α=45°.
[0009] In one embodiment, the pushing member includes a second elastic member and a push rod, the push rod is arranged close to the movable mold assembly, and the push rod can extend into any of the rivet holes of the rivet plate in the feeding channel, and the second elastic member is used to apply a force to the push rod along a direction perpendicular to the first linear direction.
[0010] In one embodiment, both the first elastic member and the second elastic member are springs.
[0011] In one embodiment, the feeding device also includes a fixed block, the pushing member also includes a fixed block, the pushing rod, the fixed block and the second elastic member are connected in sequence, and when the movable die group moves toward the fixed die group, the second pressure rod presses down the fixed block, and the downward pressure of the fixed block drives the second elastic member to store elastic potential energy.
[0012] The present utility model also proposes a punching machine, which includes the feeding device mentioned above and a riveting device. The riveting device includes a first block and a second block. The first block is arranged on the movable mold part, and the second block is arranged on the fixed mold part. When the riveting device closes the mold, the first block abuts against the second block.
[0013] In one embodiment, the first block has a first groove, and when the riveting device is in a closed mold, the first groove can accommodate the riveted piece.
[0014] In one embodiment, the first block has a first limiting portion, and the second block has a second limiting portion, and the first limiting portion can be plugged into the second block.
[0015] In one embodiment, the punching machine further includes a spring box connected to the fixed die member, and the first elastic member is partially disposed in the spring box.
[0016] In the technical solution of the present utility model, the riveted part has several holes at uniform distances. The movable mold moves toward the fixed mold, driving the first and second pressure rods to act on the slide and the ejector, respectively. At this time, the first and second elastic members store elastic potential energy, and the ejector moves out of the hole in the riveted part. The slide drives the ejector to another hole in the riveted part that is closer to the first elastic member. The movable mold moves away from the fixed mold. At this time, the first and second elastic members are released, and the ejector is drilled out of the other riveted hole in the riveted part. The slide drives the ejector away from the first elastic member, and the ejector drives the riveted part in a direction away from the first elastic member. At this point, the automatic feeding of the riveted part is completed. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0018] Figure 1 A schematic structural diagram of the feeding device and riveting device provided by the utility model;
[0019] Figure 2 for Figure 1 A partial enlarged view of the feeding device and riveting device when the mold is opened;
[0020] Figure 3 for Figure 1 A partial enlarged view of the feeding device and riveting device when the mold is closed;
[0021] Figure 4 A top view of the first and second pieces of the riveting device provided by the present invention;
[0022] Figure 5 This is an AA cross-sectional view of the first block and the second block in the riveting device provided by the utility model.
[0023] Description of Figure Numbers:
[0024] 100. Stamping machine; 1. Feeding device; 11. Moving die assembly; 111. First pressure rod; 1111. First guide surface; 112. Second pressure rod; 113. Moving die; 12. Fixed die assembly; 121. Fixed die; 122. Moving member; 1221. Push rod; 1222. Fixed block; 1223. Second elastic member; 123. Sliding seat; 1231. Second guide surface; 124. First elastic member; 13. Spring box; 2. Riveting device; 21. First block; 211. First groove; 212. First limiting portion; 22. Second block; 221. Second limiting portion.
[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0029] Riveting technology, as a metal connection process, plays an important role in multiple industrial fields. However, the feeding process in the traditional riveting process often relies on manual operation, which not only limits production efficiency, but also affects the stability of product quality. The lack of automation leads to a lack of continuity in the production process, increases labor intensity and error rate. In addition, manual feeding makes it difficult to ensure the consistency of each operation, which in turn affects the precise matching of riveted parts. Therefore, there is an urgent need for an improved feeding device to realize the automation of the feeding and riveting processes, improve production efficiency and product quality, and reduce costs and safety risks. The technical solution of this application is precisely aimed at these needs. Through automated design, the riveting process is optimized in order to achieve high-efficiency, high-precision and high-stability riveting operations.
[0030] The utility model provides a feeding device.
[0031] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present invention, the feeding device 1 is used to convey a riveted sheet, wherein the riveted sheet is provided with a plurality of riveted holes spaced apart and arranged side by side. The feeding device 1 comprises:
[0032] The movable mold assembly 11 includes a movable mold 113, a first pressure rod 111 and a second pressure rod 112. The first pressure rod 111 and the second pressure rod 112 are arranged on the movable mold 113; the first pressure rod 111 is provided with a first guide surface 1111.
[0033] The fixed mold assembly 12 includes a fixed mold member 121, a slide 123, a push member 122 and a first elastic member 124;
[0034] The movable mold 113 can move closer to or away from the fixed mold 121, and a feeding channel for the riveting sheet to pass through is formed between the fixed mold 121 and the movable mold 113;
[0035] The slide 123 is slidably disposed on the fixed mold 121 and is capable of moving relative to the fixed mold 121 along a first linear direction; the slide 123 is provided with a second guide surface 1231 corresponding to the first guide surface 1111 and having a shape adapted to the first guide surface 1111;
[0036] The ejector 122 is elastically connected to the slide 123 and is correspondingly arranged with the second pressing rod 112; the ejector 122 can extend into any riveting hole of the riveting sheet in the feeding channel;
[0037] The first elastic member 124 is disposed on the fixed mold 121 and connected to the slide 123 . The first elastic member 124 is used to apply a force along a first linear direction to the slide 123 .
[0038] The movable mold 113 and the fixed mold 121 The movable mold 113 is one of the installation bases of the feeding device 1; the fixed mold 121 is the other installation base.
[0039] The first pressing rod 111 and the second pressing rod 112 are staggered in both the x-axis and y-axis directions, and the first pressing rod 111 and the riveting plate are also staggered in the y-axis direction; the first guiding surface 1111 provided on the first pressing rod 111 is an inclined surface for guiding the movement of the slide 123.
[0040] The slide 123 has a groove, and the opening of the groove is arranged toward the moving module, and the first linear direction thereof is the x-axis direction.
[0041] The ejector 122 is disposed in the groove and connected to the groove. An embodiment of the ejector 122 is a ejector rod 1221 and a spring, and both ends of the spring are connected to the ejector rod 1221 and the groove respectively.
[0042] The first elastic member 124 is made of rubber in one embodiment. The first elastic member 124 is connected to the fixed mold 121 and can apply a force in a first linear direction to the slide 123 .
[0043] In this embodiment, in the initial state, the ejector pin 1221 is inserted into the riveting hole, and the movable die 113 can move toward or away from the fixed die assembly 12 , and the movable die 113 provides power for riveting and feeding.
[0044] When the movable mold 113 starts to move toward the fixed mold assembly 12, the movable mold 113 drives the first pressure rod 111 and the second pressure rod 112 to move downward; first, the second pressure rod 112 abuts against the second elastic member 1223, and the second elastic member 1223 drives the ejector rod 1221 to move downward, and the ejector rod 1221 moves toward the negative half-axis direction of the z-axis to below the rivet hole; then, the first pressure rod 111 abuts against the slide 123, that is, the first guide surface 1111 abuts against the second guide surface 1231. Since both guide surfaces are inclined surfaces, the first pressure rod 111 can push the slide 123 toward the first elastic member 124. During this process, the push member 122 slides with the slide 123 to the bottom of another rivet hole; during the sliding process of the slide 123, the second elastic member 1223 is always in a compressed state, and the push rod 1221 is located below the rivet plate; and the other rivet hole is closer to the first elastic member 124 relative to the previous rivet hole; the first elastic member 124 and the second elastic member 1223 store elastic potential energy.
[0045] When the movable mold 113 moves away from the fixed mold assembly 12, the movable mold 113 drives the first pressure rod 111 and the second pressure rod 112 away from the fixed mold assembly 12; at this time, the first elastic member 124 and the second elastic member 1223 convert elastic potential energy into kinetic energy. First, the second elastic member 1223 resets, and its reset drives the ejector pin 1221 to move toward the positive half-axis direction of the z-axis to a rivet hole; then the first elastic member 124 resets, and its reset drives the slide 123 to slide. At this time, the ejector pin 1221 provided in the slide 123 drives the rivet block to slide.
[0046] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present invention, the angle between the first guide surface 1111 and the horizontal plane is defined as α, where α=45°.
[0047] In this embodiment, the first guide surface 1111 and the second guide surface 1231 are shaped to match each other, allowing for smooth and consistent sliding motion. When a force acts on an inclined surface, it can be decomposed into two components: a horizontal component parallel to the inclined surface, and a vertical component perpendicular to the inclined surface. The magnitude of these two components depends on the angle of the force. When the angle of the inclined surface is 45°, the horizontal and vertical components of the force are equal. This means that most of the energy of the force is used to push the object along the inclined surface, rather than overcoming the resistance created by the vertical component. Similarly, the 45° angle minimizes the vertical component, which reduces pressure on the inclined surface and thus friction. The magnitude of friction is proportional to the vertical component; therefore, a smaller vertical component means less friction. Since the 45° angle makes the horizontal and vertical components of the force equal, this helps maximize force transmission efficiency. During the riveting process, this means that the force can be more efficiently converted into energy to move the riveted part, while reducing energy loss.
[0048] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present utility model, the ejector member 122 includes a second elastic member 1223 and a ejector rod 1221. The second elastic member 1223 is connected to the sliding member, and the ejector rod 1221 is connected to the second elastic member 1223. The ejector rod 1221 is arranged close to the movable mold assembly 11. The ejector rod 1221 can extend into any rivet hole of the rivet sheet in the feeding channel. The second elastic member 1223 is used to apply a force to the ejector rod 1221 along a direction perpendicular to the first linear direction.
[0049] The second elastic member 1223 can be rubber or a spring.
[0050] In this embodiment, the movable mold 113 drives the second pressing rod 112 downward, causing the second pressing rod 112 to contact the second elastic member 1223, thereby converting the kinetic energy of the second elastic member 1223 into elastic potential energy. During this process, the ejector pin 1221 moves out of the rivet hole, now moving in the negative z-axis direction.
[0051] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present invention, the second elastic member 1223 and the first elastic member 124 are both springs.
[0052] In this embodiment, the spring is used as a mechanical elastic element with high-efficiency energy storage and release capabilities. During the riveting process, the spring can quickly compress and store energy, and quickly release it when needed, providing stable and controllable power for the riveting action. The reason for choosing a spring instead of other types of elastic elements, such as polyurethane or pneumatic elements, is that: for example, although polyurethane can provide a certain elasticity, compared with springs, polyurethane may experience fatigue fracture under long-term cyclic loading, and its elastic modulus varies greatly with temperature and time. For example, pneumatic elements rely on a compressed air supply. At the same time, the maintenance and complexity of the pneumatic system are higher than those of the mechanical spring system, and the cost is higher. Taking all the above into consideration, the use of springs is the optimal solution.
[0053] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present invention, the ejector 122 further includes a fixed block 1222, the ejector rod 1221, the fixed block 1222 and the second elastic member 1223 are connected in sequence. When the movable die assembly 11 moves toward the fixed die assembly 12, the second pressure rod 112 presses down the fixed block 1222, and the fixed block 1222 presses down to drive the second elastic member 1223 to store elastic potential energy.
[0054] In this embodiment, fixed block 1222 serves as an intermediary element connecting ejector pin 1221 and second elastic member 1223, transmitting the force applied by second compression rod 112 to second elastic member 1223. Fixed block 1222 also has a large contact area, which increases contact stability with second compression rod 112 and ejector member 122, helping to more evenly distribute force, reduce local stress concentration, and reduce the pressure exerted by second compression rod 112 on ejector member 122, thereby reducing wear on second compression rod 112 and ejector member 122. Fixed block 1222 also helps ensure the correct positioning and alignment of ejector pin 1221 and second elastic member 1223.
[0055] During the riveting process, as the movable mold 113 moves toward and approaches the fixed mold 121, the second pressure rod 112 presses down on the fixed block 1222. This downward pressure causes the fixed block 1222 to move along the negative half-axis direction of the z-axis. As the fixed block 1222 is pressed down, it pushes the second elastic member 1223 to compress, thereby storing elastic potential energy. In the subsequent stage of the riveting process, that is, when the movable mold assembly 11 and the fixed mold assembly 12 separate, the stored elastic potential energy will be released. At this time, the pressure on the fixed block 1222 is released, and the second elastic member 1223 releases the stored elastic potential energy, pushing the fixed block 1222 and the ejector pin 1221 to reset.
[0056] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present invention, the diameter of the cross section of the push rod 1221 is smaller than the diameter of the riveting hole.
[0057] In this embodiment, the diameter of ejector pin 1221 is designed to be smaller than the hole diameter of the rivet, ensuring that ejector pin 1221 can smoothly pass through the rivet hole, achieving positioning within the rivet and movement along the z-axis. The smaller diameter reduces or even eliminates friction when ejector pin 1221 passes through the hole, helping to improve the smoothness and efficiency of the feeding action.
[0058] The present invention also provides a punching machine 100, which includes a feeding device 1 and a riveting device 2 in any of the aforementioned specific embodiments. The specific structure of the feeding device 1 refers to the above embodiments. Since the present subject 2 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. Among them, the riveting device 2 includes a first block 21 and a second block 22. The first block 21 is provided on the movable mold 113, and the second block 22 is provided on the fixed mold 121. When the riveting device 2 is closed, the first block 21 and the second block 22 abut against each other.
[0059] The contact surfaces of the first block 21 and the second block 22 are adapted to each other, the riveting device 2 and the feeding device 1 are on the same x-axis, and from the negative half axis to the positive half axis of the x-axis, the riveting device 2 and the feeding device 1 in the punching machine 100 are arranged in sequence.
[0060] When the riveting device 2 performs the mold closing action, the movable mold part 113 moves downward, so that the first block 21 abuts against the second block 22, ensuring the correct positioning and fixation of the riveted parts.
[0061] In this embodiment, initially, the movable mold 113 is at its top dead center position, the first block 21 is positioned on the movable mold 113, and the second block 22 is fixed to the fixed mold 121. The main workpiece is placed in the rivet hole of the rivet plate located on the second block 22. The movable mold 113 begins to move downward, and the riveting device 2 is activated. The movable mold 113 drives the first block 21 downward toward the second block 22. As the movable mold 113 moves downward, the first block 21 first contacts the upper surface of the main workpiece, beginning to apply pressure to the main workpiece. The movable mold 113 continues to move downward until the first block 21 abuts the second block 22. At this point, the riveting device 2 completes the mold closing action, and the riveting is complete.
[0062] See also Figure 1 and Figure 4 and Figure 5 In one embodiment of the present invention, the first block 21 has a first groove 211. When the riveting device 2 is closed, the first groove 211 can accommodate the riveted piece.
[0063] In this embodiment, when the movable mold 113 moves downward to the closed mold position, the first block 21 and the second block 22 come into contact, clamping the main workpiece and the riveted component therebetween. When the movable mold assembly 11 reaches its bottom dead center, the first groove 211 of the first block 21 encases the convex bump formed by the main workpiece and the riveted component. The first and second blocks 21, 22 jointly compress the material, causing it to overflow and wrap around the rivet. At this point, the riveted component is partially or fully contained within the first groove 211 of the first block 21, helping to stabilize its position. Furthermore, the inner wall of the first groove 211 exerts a suitable restraining force on the riveted component, preventing the convex bump from snapping back.
[0064] See also Figure 1 and Figure 4 and Figure 5 In one embodiment of the present invention, the first block 21 has a first limiting portion 212 , and the second block 22 has a second limiting portion 221 . The first limiting portion 212 can be plugged into the second block 22 .
[0065] The first limiting portion 212 and the second limiting portion 221 may be protrusions or grooves. For example, if the first limiting portion 212 is a protrusion, the second limiting portion 221 is a groove.
[0066] In this embodiment, the first stopper 212 and the second stopper 221 interact with each other. When the feeding device 1 is closed, the first stopper 212 of the first block 21 and the second stopper 221 of the second block 22 engage with each other, forming a mechanical fit that ensures the relative position and alignment between the first block 21 and the second block 22. This interaction of the stoppers secures the rivet in place, further reducing the possibility of the bulge flipping back under the riveting force.
[0067] See also Figure 1 and Figure 2 and Figure 3 In one embodiment of the present invention, the punching machine 100 further includes a spring box 13 , which is connected to the fixed die 121 , and the first elastic member 124 is partially disposed in the spring box 13 .
[0068] The spring box 13 is connected to the fixed mold 121 through mechanical parts such as bolts, pins or other fasteners to ensure the synchronous movement of the first elastic member 124 during the riveting process and provide a mounting base for the first elastic member 124.
[0069] In this embodiment, the spring box 13 plays a crucial role in the punching machine 100 of this embodiment. It is specifically designed to securely hold the first elastic member 124, or spring, ensuring its precise and stable position during operation. The design of the spring box 13 isolates the first elastic member 124 from the other components of the punching machine 100, protecting the spring from mechanical impact or damage and extending its service life. Furthermore, during the riveting process, the first elastic member 124 within the spring box 13 absorbs excess impact force, reducing vibration and damage to the riveting machine structure and improving the stability and durability of the entire machine.
[0070] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.
Claims
1. A feeding device for conveying a riveted sheet, wherein the riveted sheet is provided with a plurality of riveted holes spaced apart and arranged side by side, characterized in that: The feeding device comprises: The movable mold group includes a movable mold part, a first pressure rod and a second pressure rod, wherein the first pressure rod and the second pressure rod are arranged on the movable mold part; the first pressure rod is provided with a first guide surface, A fixed die assembly, comprising a fixed die member, a slide seat, a push member and a first elastic member; The movable mold part can move closer to or away from the fixed mold part, and a feeding channel for the riveting sheet to pass through is formed between the fixed mold part and the movable mold part; The slide is slidably provided on the fixed mold and is capable of moving relative to the fixed mold along a first linear direction; the slide is provided with a second guide surface corresponding to the first guide surface and having a shape adapted to the first guide surface; The ejector is elastically connected to the slide seat and is correspondingly arranged with the second pressure rod; the ejector can extend into any of the riveting holes of the riveting sheet in the feeding channel; The first elastic member is provided on the fixed mold member and is connected to the slide seat; the first elastic member is used to apply a force along the first linear direction to the slide seat.
2. The feeding device according to claim 1, characterized in that The included angle between the first guide surface and the horizontal plane is defined as α, where α=45°.
3. The feeding device according to claim 2, characterized in that The ejector member includes a second elastic member and a ejector rod, the ejector rod is connected to the second elastic member, the ejector rod is arranged close to the movable die assembly, the ejector rod can extend into any of the rivet holes of the rivet sheet in the feeding channel, and the second elastic member is used to apply a force to the ejector rod along a direction perpendicular to the first linear direction.
4. The feeding device according to claim 3, characterized in that The first elastic member and the second elastic member are both springs.
5. The feeding device according to claim 3, characterized in that: The ejector member also includes a fixed block, and the ejector rod, the fixed block and the second elastic member are connected in sequence. When the movable die group moves toward the fixed die group, the second pressure rod presses down the fixed block, and the downward pressure of the fixed block drives the second elastic member to store elastic potential energy.
6. The feeding device according to claim 3, characterized in that: The diameter of the cross section of the push rod is smaller than the diameter of the riveting hole.
7. A punching machine, characterized in that: It includes the feeding device and riveting device according to any one of claims 1 to 6, the riveting device includes a first block and a second block, the first block is provided on the movable mold, and the second block is provided on the fixed mold, when the riveting device is closed, the first block abuts against the second block.
8. The punching machine according to claim 7, wherein: The first block has a first groove, and when the riveting device is closed, the first groove can accommodate the riveting piece.
9. The punching machine according to claim 8, wherein The first block has a first limiting portion, and the second block has a second limiting portion. The first limiting portion can be plugged into the second block.
10. The punching machine according to claim 7, wherein The punching machine further comprises a spring box connected to the fixed die member, and the first elastic member is partially arranged in the spring box.