Metal plate stamping mechanism

Abstract

The invention relates to the technical field of stamping mechanisms, in particular to a sheet metal stamping mechanism which comprises an upper die, a lower die, a hydraulic machine and a base, the hydraulic machine is fixedly connected to the base, the upper die is fixedly connected to the hydraulic machine, the lower die is fixedly connected to the base, and a rectangular rod is fixedly connected between the upper die and the hydraulic machine. A mounting seat is arranged around the rectangular rod, an adjusting assembly with an adjusting rod is arranged in the mounting seat, the adjusting assembly adjusts the deviation of the rectangular rod by controlling the adjusting rod to slide on the mounting seat, a limiting assembly with a limiting rod is further arranged in the mounting seat, one end of the limiting rod is attached to the rectangular rod, and the other end of the limiting rod is attached to the limiting rod. When the rectangular rod moves back and forth in the vertical direction, the limiting rod is kept to be attached to the rectangular rod through the limiting assembly, and therefore it is guaranteed that the upper die and the lower die are kept aligned in the stamping process through the design, and meanwhile deviation caused by abrasion of the guiding device is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of stamping mechanisms, in particular to a metal plate stamping mechanism. Background Art

[0002] A sheet metal stamping mechanism is a device used to form metal sheets through mechanical impact. A sheet metal stamping mechanism is usually used in the manufacturing industry to produce various metal parts and components. A sheet metal stamping mechanism includes a stamping machine, a die and a pressing plate. The working principle of the sheet metal stamping mechanism is to place the metal sheet in the die of the stamping machine and then apply pressure with the punch of the stamping machine to achieve the forming of the metal sheet.

[0003] The centering of the die in the sheet metal stamping mechanism is very important. The centering of the die refers to ensuring the precise alignment of the upper die and the lower die when installing the die. The precise alignment of the upper die and the lower die is crucial to ensuring the dimensional accuracy and production consistency of the stamped parts. If the upper die and the lower die are not aligned, it may cause quality problems of the stamped parts, such as dimensional deviation or die damage. In order to ensure the centering of the die during the operation of the sheet metal stamping mechanism, guide devices are usually set on the moving parts, such as guide columns and guide rails. However, these guide devices will wear out due to long-term use, thereby affecting the alignment and processing quality of the upper and lower dies.

[0004] In response to the above problems, the prior art provides some solutions. For example, patent application number: CN202311165848.5 provides a guided truck tailgate trim stamping die, including a top plate and a base, a hydraulic cylinder is symmetrically installed on the lower surface of the top plate, the piston rods of the two hydraulic cylinders are jointly fixed with an upper die, a die head is provided on the upper die, a lower die is fixed on the upper surface of the base, a die base is provided on the lower die, the die head and the die base cooperate with each other to stamp out the sheet blank; guide holes are provided at the corners of the lower die, guide rods corresponding to the guide holes are fixed on the lower surface of the upper die, and multiple groups of lubrication mechanisms are provided on the guide rods. This solution is to reduce the wear between components by adding lubricating oil, thereby ensuring the accuracy of stamping, but lubricating oil can only reduce wear, and the wear between components will still affect the accuracy of stamping. Summary of the invention

[0005] The object of the present invention is to provide a metal sheet stamping mechanism to solve the problem that during the operation of the metal sheet stamping mechanism, guide devices, such as guide pillars, guide rails, etc., are set on the moving parts, but these guide devices will wear out due to long-term use, thereby affecting the alignment and processing quality of the upper mold and the lower mold.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A metal sheet stamping mechanism comprises an upper die, a lower die, a hydraulic press and a base, wherein the hydraulic press is fixedly connected to the base, the upper die is fixedly connected to the hydraulic press, the lower die is fixedly connected to the base, a rectangular rod is fixedly connected between the upper die and the hydraulic press, mounting seats are arranged around the rectangular rod, the number of the mounting seats is 4, and the four mounting seats are all fixedly connected to the base, an adjustment component with an adjustment rod is arranged inside the mounting seat, the adjustment rod is slidably connected to the mounting seat, the adjustment component adjusts the offset of the rectangular rod by controlling the sliding of the adjustment rod on the mounting seat, a limiting component with a limiting rod is also arranged inside the mounting seat, the limiting rod is hinged to the mounting seat, one end of the limiting rod is in contact with the rectangular rod, and when the rectangular rod moves back and forth in the vertical direction, the limiting rod is kept in contact with the rectangular rod through the limiting component.

[0008] It is easy to understand that during the use of the metal sheet stamping mechanism, the upper mold will be offset during the stamping process due to factors such as aging and wear, making it impossible for the upper mold and the lower mold to be aligned, and ultimately resulting in dimensional deviations in the finished product after stamping, and may even cause damage to the mold. The design installs a mounting seat around the rectangular rod, and sets an adjustment component and a limit component in the mounting seat. The adjustment component can control the sliding of the adjustment rod to contact the rectangular rod and apply pressure to the rectangular rod when the rectangular rod moves to the uppermost end, so that the offset rectangular rod is straightened, and the adjustment component can keep the limit rod and the rectangular rod in contact by rotating the limit rod after the adjustment component completes the adjustment of the rectangular rod, so that the upper mold and the lower mold remain aligned during the downward movement of the rectangular rod, and not only the gap caused by the offset of the rectangular rod but also the gap caused by the wear of the limit rod can be kept in contact with the rectangular rod through the limit assembly. Therefore, the design not only ensures that the upper mold and the lower mold remain aligned during the stamping process, but also avoids the deviation caused by the wear of the guide device.

[0009] Preferably, the limit assembly includes a one-way bearing, the limit rod is hinged to the mounting seat, the one-way bearing is fixedly installed between the limit rod and the mounting seat, a friction plane is provided on one end of the limit rod, the angle between the limit rod and the rectangular rod is A, and the 0°≤A≤90° is provided on the mounting seat, and one end of the limit rod having the friction plane extends toward the outside of the mounting seat through the rectangular opening, and the friction plane is fitted with a plane on one side of the rectangular rod, and the one-way bearing is used to limit the limit rod from rotating in a direction away from the rectangular rod.

[0010] It is easy to understand that the rectangular rod is performing uninterrupted up and down reciprocating motion when working. When the rectangular rod moves upward, the friction plane contacts the rectangular rod, and the one-way bearing does not limit the limit rod from rotating upward. Therefore, the limit rod will be driven and rotated upward by the friction between the friction plane and the rectangular rod. The gap between the friction plane and the rectangular rod caused by the wear of the limit rod itself or the wear of the rectangular rod will be compensated by the upward rotation of the limit rod. When the rectangular rod moves downward, the limit rod cannot swing due to the restriction of the one-way bearing. At this time, the limit rod will limit the downward movement of the rectangular rod to ensure that the upper mold and the lower mold remain aligned. This design limits the swing of the limit rod by designing a one-way bearing, so that the limit rod can continuously compensate for the gap caused by wear, thereby avoiding the wear on the limit rod or the rectangular rod affecting the alignment of the upper mold and the lower mold, and reducing maintenance costs.

[0011] Preferably, the limiting rod is fixedly connected with gear 1, the mounting seat is slidably connected with rack 1, the gear 1 and rack 1 are meshed with each other, the mounting seat is also rotatably connected with gear 2, the gear 2 and rack 1 are meshed with each other, the mounting seat is provided with a support rod, the support rod is located directly below the limiting rod and is slidably connected with the mounting seat, the support rod is fixedly connected with rack 2, the rack 2 and gear 2 are meshed with each other, and the support rod is in contact with the limiting rod.

[0012] It is easy to understand that the rectangular rod is limited in displacement by the limit rod during its downward movement, and the rotation of the limit rod is limited by the one-way bearing. Therefore, the one-way bearing will be subjected to greater pressure, which can easily cause damage to the one-way bearing. This design designs a support rod directly below the limit rod, so that when the limit rod is subjected to pressure from the rectangular rod, the support rod can support the limit rod, thereby sharing the pressure on the one-way bearing and improving the reliability of the metal sheet stamping mechanism. This design also uses a rack and pinion transmission method, so that when the limit rod rotates upward, the rack and pinion will drive the support rod to move toward the outside of the mounting seat, ensuring that the support rod can always be in contact with the limit rod, further improving the reliability of the metal sheet stamping mechanism.

[0013] Preferably, the adjustment assembly includes a slider 1, which is fixedly connected to the adjustment rod, a flat plate is slidably connected to the rectangular rod, a connecting rod is slidably connected to the mounting seat, one end of the connecting rod extends outward and is fixedly connected to the flat plate, a lifting block is provided on the rectangular rod, a slider 2 is fixedly connected to the connecting rod, a slope 1 is provided on the slider 1, a slope 2 is provided on the slider 2, the slope 1 is in contact with the slope 2, and a spring 1 is provided between the slider 1 and the mounting seat.

[0014] It is easy to understand that when the rectangular rod moves to the uppermost end, the lifting block will lift the flat plate, and the flat plate will drive slider 2 to move. During the movement of slider 2, inclined surface 2 on slider 2 will exert pressure on inclined surface 1 on slider 1 to cause slider 1 to displace, thereby causing slider 1 to push the adjusting rod to the outside of the mounting seat to adjust the rectangular rod. This design can not only utilize the movement of the rectangular rod during operation to drive the adjusting rod to adjust the rectangular rod, but also has a simple and compact structure, avoiding the need for too many parts and power components inside the mounting seat, facilitating maintenance while reducing maintenance costs.

[0015] Preferably, two telescopic rods 1 are symmetrically provided on the slider 2, and the two telescopic rods 1 are slidably connected to the telescopic rod 2, a spring 2 is provided between the telescopic rod 1 and the telescopic rod 2, a long rod is fixedly connected between the two telescopic rods 2, the long rod is in contact with the limiting rod, the limiting rod is provided with an arc groove, the long rod is provided with a chamfer that cooperates with the arc groove, and the long rod is in contact with the inner wall of the arc groove.

[0016] It is easy to understand that when the rectangular rod moves to the uppermost end, the lifting block will lift the flat plate to lift up the slider two and follow the movement of the baffle plate. The telescopic rod one and telescopic rod two at the bottom of the slider two will move together with the slider. At this time, the long rod on the telescopic rod two will squeeze the limit rod to make the limit rod rotate. The rotation of the limit rod will make up for the gap between the limit rod and the rectangular rod due to wear. The design links the adjustment component with the limit rod, so that when the limit rod moves to the top, the adjustment component will adjust the position of the rectangular rod. After the adjustment component completes the adjustment of the position of the rectangular rod, a gap will be generated between the limit rod and the rectangular rod. At this time, the long rod will squeeze the limit rod to make the limit rod rotate, thereby making up for the gap between the limit rod and the rectangular rod. When the rectangular rod moves downward, the rectangular rod not only completes the position adjustment, but also the limit rod can limit the rectangular rod from deflecting during the downward pressing process. Therefore, the design further improves the reliability of the metal sheet stamping mechanism.

[0017] Preferably, a support plate is provided on one end of the support rod, the support plate is hinged on the support rod, the support plate is in contact with the limiting rod, and the mounting seat is provided with a boss, which is in contact with the support rod.

[0018] It is easy to understand that when the rectangular rod is offset, the limit rod will be subjected to pressure from the rectangular rod, and the support rod can support the limit rod while also bearing pressure from the limit rod. Since the limit rod will rotate to maintain fit with the rectangular rod, the angle between the limit rod and the support rod will continue to change, which makes the contact between the support rod and the limit rod always a line contact, and the small contact area can easily cause damage to the support rod and the limit rod. This design hinges the support plate on the support rod, and the support plate can flexibly adapt to the angle change of the limit rod, so that the contact area between the support rod and the support plate is always maintained at a fixed value. Therefore, this design reduces the damage between the support rod and the limit rod, and further reduces the maintenance cost.

[0019] Preferably, a shielding plate is provided on the rectangular opening, the shielding plate is slidably connected to the mounting seat, and one end of the shielding plate is in contact with the limiting rod.

[0020] It is easy to understand that when the metal sheet stamping mechanism is working, flying iron chips and various impurities will be generated. If these iron chips and impurities enter the interior of the mounting base through the rectangular opening, it is easy to cause the gears to get stuck, thereby affecting the normal operation of the internal components of the mounting base. This design sets a baffle plate on the rectangular opening. The baffle plate can effectively block the flying iron chips and impurities, and the baffle plate is set at the rectangular opening by a sliding connection, which enables the baffle plate to move with the rotation of the limit rod. Therefore, this design can effectively prevent iron chips and impurities from affecting the normal operation of the internal components of the mounting base.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention arranges an adjustment component and a limit component inside the mounting seat. The adjustment component can control the adjustment rod to slide and contact the rectangular rod and apply pressure to the rectangular rod when the rectangular rod moves to the uppermost end, so as to straighten the offset rectangular rod. The adjustment component can keep the limit rod in contact with the rectangular rod by rotating the limit rod after the adjustment component completes the adjustment of the rectangular rod, so that the upper mold and the lower mold are kept aligned during the downward movement of the rectangular rod. Therefore, this design not only ensures that the upper mold and the lower mold are kept aligned during the stamping process, but also avoids the deviation caused by the wear of the guide device.

[0023] 2. The present invention arranges a support rod inside the mounting seat so that when the limit rod is subjected to pressure from the rectangular rod, the support rod can support the limit rod, thereby sharing the pressure on the one-way bearing and improving the reliability of the metal sheet stamping mechanism. In addition, the design also uses a rack and pinion transmission so that when the limit rod rotates upward, the rack and pinion will drive the support rod to move toward the outside of the mounting seat, thereby ensuring that the support rod can always be in contact with the limit rod, thereby improving the reliability of the metal sheet stamping mechanism.

[0024] 3. The present invention arranges a baffle plate on the mounting base. The baffle plate is arranged on the rectangular opening. The baffle plate can effectively block flying iron filings and impurities, and the baffle plate is arranged at the rectangular opening by a sliding connection, so that the baffle plate can move with the rotation of the limit rod. Therefore, the design can effectively prevent iron filings and impurities from affecting the normal operation of the internal components of the mounting base. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the metal sheet stamping mechanism of the present invention;

[0026] Figure 2 for Figure 1 Axonometric drawing from above;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 It is a structural schematic diagram of the mounting seat of the present invention;

[0029] Figure 5 for Figure 4 Sectional view at the middle BB;

[0030] Figure 6 for Figure 5 Axonometric drawing;

[0031] Figure 7 for Figure 1 A partial cross-sectional view of the middle mounting seat;

[0032] Figure 8 for Figure 7 Enlarged view of center C.

[0033] In the figure: 1. base; 2. mounting seat; 211. one-way bearing; 212. friction plane; 213. rectangular opening; 214. limit rod; 221. slider 1; 222. flat plate; 223. connecting rod; 224. lifting block; 225. slider 2; 226. inclined plane 1; 227. inclined plane 2; 228. spring 1; 229. adjusting rod; 231. gear 1; 232. rack 1; 233. gear 2; 234. support rod; 235. rack 2; 241. telescopic rod 1; 242. telescopic rod 2; 243. spring 2; 244. long rod; 251. support plate; 252. boss; 261. shielding plate; 271. arc groove; 3. hydraulic press; 31. rectangular rod; 4. upper mold; 5. lower mold. DETAILED DESCRIPTION

[0034] The present invention provides a metal sheet stamping mechanism, and the technical solution is as follows:

[0035] See also Figure 1 , Figure 4 and Figure 5 A metal sheet stamping mechanism comprises an upper die 4, a lower die 5, a hydraulic press 3 and a base 1, the hydraulic press 3 is fixedly connected to the base 1, the upper die 4 is fixedly connected to the hydraulic press 3, the lower die 5 is fixedly connected to the base 1, a rectangular rod 31 is fixedly connected between the upper die 4 and the hydraulic press 3, mounting seats 2 are arranged around the rectangular rod 31, the number of mounting seats 2 is 4, and the four mounting seats 2 are fixedly connected to the base 1, an adjusting component with an adjusting rod 229 is arranged inside the mounting seat 2, the adjusting rod 229 is slidably connected to the mounting seat 2, the adjusting component adjusts the offset of the rectangular rod 31 by controlling the sliding of the adjusting rod 229 on the mounting seat 2, and a limiting component with a limiting rod 214 is also arranged inside the mounting seat 2, the limiting rod 214 is hinged to the mounting seat 2, one end of the limiting rod 214 is in contact with the rectangular rod 31, and when the rectangular rod 31 moves back and forth in the vertical direction, the limiting rod 214 is kept in contact with the rectangular rod 31 through the limiting component.

[0036] For further information, see Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The limiting assembly includes a one-way bearing 211, a limiting rod 214 is hinged to the mounting seat 2, and the one-way bearing 211 is fixedly installed between the limiting rod 214 and the mounting seat 2. A friction plane 212 is provided on one end of the limiting rod 214. The angle between the limiting rod 214 and the rectangular rod 31 is A, 0°≤A≤90°. A rectangular opening 213 is provided on the mounting seat 2. One end of the limiting rod 214 having the friction plane 212 extends toward the outside of the mounting seat 2 through the rectangular opening 213, and the friction plane 212 is fitted with a plane on one side of the rectangular rod 31. The one-way bearing 211 is used to limit the limiting rod 214 from rotating in a direction away from the rectangular rod 31. A shielding plate 261 is provided on the rectangular opening 213. The shielding plate 261 is slidably connected to the mounting seat 2, and one end of the shielding plate 261 contacts the limiting rod 214.

[0037] See also Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8A gear 231 is fixedly connected to the limit rod 214, and a rack 232 is slidably connected inside the mounting seat 2. The gear 231 and the rack 232 are meshed with each other. A gear 233 is also rotatably connected inside the mounting seat 2. The gear 233 and the rack 232 are meshed with each other. The mounting seat 2 is provided with a support rod 234, and the support rod 234 is located directly below the limit rod 214 and is slidably connected to the mounting seat 2. A rack 235 is fixedly connected to the support rod 234, and the rack 235 and the gear 233 are meshed with each other. The support rod 234 contacts the limit rod 214, and a support plate 251 is provided at one end of the support rod 234. The support plate 251 is hinged on the support rod 234, and the support plate 251 is in contact with the limit rod 214, and a boss 252 is provided on the mounting seat 2, and the boss 252 contacts the support rod 234.

[0038] See also Figures 1 to 8 The adjusting assembly includes a slider 221, which is fixedly connected to the adjusting rod 229, a flat plate 222 is slidably connected to the rectangular rod 31, a connecting rod 223 is slidably connected to the mounting seat 2, one end of the connecting rod 223 extends outward and is fixedly connected to the flat plate 222, a lifting block 224 is provided on the rectangular rod 31, a slider 225 is fixedly connected to the connecting rod 223, a slope 1 226 is provided on the slider 1 221, and a slope 227 is provided on the slider 225, and the slope 1 226 fits with the slope 227, and the slider 1 221 is connected to the mounting seat 2. A spring 1 228 is provided between the mounting seats 2, and two telescopic rods 1 241 are symmetrically provided on the slider 225. The two telescopic rods 1 241 are slidably connected with telescopic rods 242. A spring 243 is provided between the telescopic rod 1 241 and the telescopic rod 242. A long rod 244 is fixedly connected between the two telescopic rods 242. The long rod 244 contacts the limiting rod 214. The limiting rod 214 is provided with an arc groove 271. The long rod 244 is provided with a chamfer that cooperates with the arc groove 271, and the long rod 244 contacts the inner wall of the arc groove 271.

[0039] See also Figures 1 to 8When the hydraulic press 3 drives the rectangular rod 31 to move upward, the upper mold 4 at one end of the rectangular rod 31 moves with the rectangular rod 31 and moves away from the lower mold 5 on the base 1. During the movement of the rectangular rod 31, the surface of the rectangular rod 31 contacts the friction plane 212 on the limit rod 214. Since the one-way bearing 211 does not limit the upward rotation of the limit rod 214, the friction force causes the limit rod 214 to rotate upward, and the friction plane 212 remains in contact with the surface of the rectangular rod 31. When the limit rod 214 rotates due to the friction force, the limit rod 214 will push the baffle plate 261 slidably connected to the mounting seat 2, and the gear 1 231 fixedly connected to the limit rod 214 rotates with the limit rod 214, and the rack 1 meshing with the gear 1 231 232 moves due to the rotation of gear 1 231, thereby causing gear 233 meshing with rack 1 232 to rotate, and gear 233 drives rack 235 meshing with gear 233 to move. At this time, the support rod 234 fixedly connected to rack 235 moves along with rack 235, and the support plate 251 at one end of the support rod 234 is pushed by the support rod 234 and fits with the limiting rod 214. After the support plate 251 contacts the limiting rod 214, the support plate 251 rotates around the support rod 234 due to the pressure, so that the plane on the support plate 251 can fit with the bottom surface of the limiting rod 214. When the rectangular rod 31 moves upward to the maximum distance, the lifting block 224 on the rectangular rod 31 will push the flat plate 222 up At this time, the connecting rod 223 fixedly connected to the flat plate 222 and the second slider 225 will move, and the second inclined surface 227 on the second slider 225 will squeeze the inclined surface 1 226 on the first slider 221 to make the first slider 221 slide. At this time, the first slider 221 will squeeze the spring 1 228 and push the adjusting rod 229 to the outside of the mounting seat 2. At this time, the adjusting rod 229 applies pressure to the rectangular rod 31 to align the rectangular rod 31. During the movement of the second slider 225, the telescopic rod 1 241 at the bottom of the second slider 225 will pull the telescopic rod 242 through the spring 243, and the long rod 244 on the telescopic rod 1 241 will move with the telescopic rod 242 and contact the inner wall of the arc groove 271. At this time, the long rod 244 will apply pressure to the inner wall of the arc groove 271 to drive The limiting rod 214 rotates, and the limiting rod 214 rotates so that the friction plane 212 at the front end of the limiting rod 214 fits with the rectangular rod 31. When the limiting rod 214 rotates due to the pressure of the long rod 244, the limiting rod 214 will push the shielding plate 261 slidably connected to the mounting seat 2, and the gear 1 231 fixedly connected to the limiting rod 214 rotates along with the limiting rod 214. The rack 1 232 meshing with the gear 1 231 moves due to the rotation of the gear 1 231, thereby causing the gear 2 233 meshing with the rack 1 232 to rotate, and the gear 2 233 drives the rack 2 235 meshing with the gear 2 233 to move. At this time, the support rod 234 fixedly connected to the rack 235 moves along with the rack 235.The support plate 251 at one end of the support rod 234 is pushed by the support rod 234 and fits with the limiting rod 214. After the support plate 251 contacts the limiting rod 214, the support plate 251 rotates around the support rod 234 due to the pressure, so that the plane on the support plate 251 can fit with the bottom surface of the limiting rod 214.

[0040] See also Figures 1 to 8 When the hydraulic press 3 drives the rectangular rod 31 to move downward, the lifting block 224 on the rectangular rod 31 is away from the flat plate 222, and the flat plate 222 loses the support of the lifting block 224 and falls down. The connecting rod 223 and the second slider 225 move together with the flat plate 222. The telescopic rod 1 241 and the second telescopic rod 242 under the second slider 225 also move together with the second slider 225. The long rod 244 on the second telescopic rod 242 is away from the arc groove 271. When the second slider 225 moves downward, the inclined surface 227 on the second slider 225 no longer squeezes the first slider 2 The inclined surface 226 on the slider 21, the slider 1 221 loses the pressure of the slider 225 and is pushed by the spring 1 228. At this time, the adjusting rod 229 moves with the slider 1 221 and moves away from the rectangular rod 31. If the rectangular rod 31 deviates during the downward movement of the rectangular rod 31, the rectangular rod 31 squeezes the limiting rod 214 located in the deviating direction. The limiting rod 214 applies pressure to the rectangular rod 31 to prevent the rectangular rod 31 from deviating. When the upper mold 4 on the rectangular rod 31 completely squeezes the lower mold 5 on the base 1, the rectangular rod 31 completes the entire downward movement process.

[0041] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A metal sheet stamping mechanism, comprising an upper die (4), a lower die (5), a hydraulic press (3) and a base (1), wherein the hydraulic press (3) is fixedly connected to the base (1), the upper die (4) is fixedly connected to the hydraulic press (3), and the lower die (5) is fixedly connected to the base (1), characterized in that: A rectangular rod (31) is fixedly connected between the upper mold (4) and the hydraulic press (3). Mounting seats (2) are arranged around the rectangular rod (31). The number of the mounting seats (2) is 4, and the four mounting seats (2) are fixedly connected to the base (1). An adjustment component having an adjustment rod (229) is arranged inside the mounting seat (2). The adjustment rod (229) is slidably connected to the mounting seat (2). The adjustment component adjusts the offset of the rectangular rod (31) by controlling the sliding of the adjustment rod (229) on the mounting seat (2). A limiting component having a limiting rod (214) is also arranged inside the mounting seat (2). The limiting rod (214) is hinged to the mounting seat (2), and one end of the limiting rod (214) is in contact with the rectangular rod (31). When the rectangular rod (31) moves back and forth in the vertical direction, the limiting rod (214) is kept in contact with the rectangular rod (31) through the limiting component.

2. A metal sheet stamping mechanism according to claim 1, characterized in that: The limiting assembly comprises a one-way bearing (211), the limiting rod (214) is hinged to the mounting seat (2), the one-way bearing (211) is fixedly mounted between the limiting rod (214) and the mounting seat (2), a friction plane (212) is provided on one end of the limiting rod (214), an angle A is formed between the limiting rod (214) and the rectangular rod (31), and 0°≤A≤90° is provided on the mounting seat (2), an end of the limiting rod (214) having the friction plane (212) extends toward the outside of the mounting seat (2) through the rectangular opening (213), and the friction plane (212) is fitted with a plane on one side of the rectangular rod (31), and the one-way bearing (211) is used to limit the limiting rod (214) from rotating in a direction away from the rectangular rod (31).

3. A metal sheet stamping mechanism according to claim 2, characterized in that: The limiting rod (214) is fixedly connected with a gear 1 (231), the mounting seat (2) is slidably connected with a rack 1 (232), the gear 1 (231) and the rack 1 (232) are meshed with each other, the mounting seat (2) is also rotatably connected with a gear 2 (233), the gear 2 (233) and the rack 1 (232) are meshed with each other, the mounting seat (2) is provided with a support rod (234), the support rod (234) is located directly below the limiting rod (214) and is slidably connected with the mounting seat (2), the support rod (234) is fixedly connected with a rack 2 (235), the rack 2 (235) and the gear 2 (233) are meshed with each other, and the support rod (234) is in contact with the limiting rod (214).

4. A metal sheet stamping mechanism according to claim 3, characterized in that: The adjustment assembly comprises a slider (221), wherein the slider (221) is fixedly connected to an adjustment rod (229), a flat plate (222) is slidably connected to the rectangular rod (31), a connecting rod (223) is slidably connected to the mounting seat (2), one end of the connecting rod (223) extends outward and is fixedly connected to the flat plate (222), a lifting block (224) is provided on the rectangular rod (31), a slider (225) is fixedly connected to the connecting rod (223), a slope (226) is provided on the slider (221), a slope (227) is provided on the slider (225), the slope (226) is in contact with the slope (227), and a spring (228) is provided between the slider (221) and the mounting seat (2).

5. A metal sheet stamping mechanism according to claim 4, characterized in that: Two telescopic rods (241) are symmetrically arranged on the second slide block (225), and the two telescopic rods (241) are both slidably connected to the second telescopic rod (242). A spring (243) is arranged between the first telescopic rod (241) and the second telescopic rod (242), and a long rod (244) is fixedly connected between the two second telescopic rods (242), and the long rod (244) is in contact with the limiting rod (214).

6. A metal sheet stamping mechanism according to claim 3, characterized in that: A support plate (251) is provided on one end of the support rod (234), the support plate (251) is hinged on the support rod (234), the support plate (251) is in contact with the limiting rod (214), and a boss (252) is provided on the mounting seat (2), the boss (252) is in contact with the support rod (234).

7. The metal sheet stamping mechanism according to claim 1, characterized in that: A shielding plate (261) is provided on the rectangular opening (213), the shielding plate (261) is slidably connected to the mounting seat (2), and one end of the shielding plate (261) is in contact with the limiting rod (214).

8. The metal sheet stamping mechanism according to claim 3, characterized in that: The limiting rod (214) is provided with an arc groove (271), the long rod (244) is provided with a chamfer that matches the arc groove (271), and the long rod (244) is in contact with the inner wall of the arc groove (271).

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