Stamping equipment and method for solving stamping dezincification of galvanized sheet

Abstract

The invention relates to the technical field of stamping equipment, in particular to stamping equipment and method for solving stamping dezincification of a galvanized sheet, the stamping equipment comprises the stamping equipment fixed on a machine table, and the stamping equipment comprises a guide column, a stamping oil cylinder, a buffer assembly, a stamping forming assembly and an auxiliary demolding assembly; a piston rod of the punching oil cylinder is downwards fixed with a mounting plate which is in sliding fit with the guide columns; the punch forming assembly comprises an upper die base and a lower die base, the upper die base is connected with the mounting plate through buffer columns, an upper die is fixed to the bottom face of the upper die base, and a die cavity of the lower die base is internally provided with a demolding hole; the buffer assembly comprises a buffer plate in sliding fit with the guide columns, and the buffer plate is located between the mounting plate and the lower die base. The auxiliary demolding assembly comprises a push-out rod which moves synchronously with the buffer plate, and the top end of the push-out rod corresponds to the demolding hole. When the stamping equipment stamps a galvanized sheet, a zinc layer is uniformly stressed, so that the dezincification phenomenon is reduced, the surface integrity and corrosion resistance of a workpiece are improved, and meanwhile, the service life of a die is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping equipment, and in particular to a stamping equipment and method for solving the problem of dezincification of galvanized sheet during stamping. Background Art

[0002] Galvanized sheets are widely used in home appliances, automobiles, building materials and other fields due to their excellent corrosion resistance. Stamping refers to a processing method that uses presses and dies to apply external force to sheets, strips, pipes and profiles to cause plastic deformation or separation, thereby obtaining workpieces of the desired shape and size. The purpose of stamping is to obtain better quality parts, prevent steel sheets from rusting, and increase service life. However, during the stamping process, galvanized sheets are prone to dezincification. Specifically, the pressure rises suddenly when the punch contacts the workpiece, and the zinc layer breaks and delaminates due to its high brittleness and cannot withstand the impact. In addition, after stamping, the workpiece easily adheres to the die, making demolding inconvenient. Hard pulling may cause the zinc layer to separate from the substrate along with the die, causing the zinc layer to scratch, fall off or partially peel off from the surface of the substrate. Additional re-plating is required, increasing production costs. Summary of the Invention

[0003] In order to overcome the problems existing in the prior art, the purpose of the present invention is to provide a stamping device and method for solving the problem of dezincification of galvanized sheet by stamping, which adopts the synergistic effect of a buffer component and a progressive stamping mechanism, thereby significantly reducing the risk of impact damage to the zinc layer.

[0004] The object of the present invention is achieved through the following technical solutions: A stamping device for solving the problem of dezincification of galvanized sheet metal during stamping, including a stamping device fixed on a machine platform, the stamping device including a guide column, a stamping cylinder, a buffer assembly, a stamping forming assembly, and an auxiliary demolding assembly; the piston rod of the stamping cylinder is fixed downward with a mounting plate that slides with the guide column; the stamping forming assembly includes an upper die base and a lower die base, the upper die base is connected to the mounting plate through a buffer column, an upper die is fixed to the bottom surface of the upper die base, and a demolding hole is provided in the die cavity of the lower die base; the buffer assembly includes a buffer plate that slides with the guide column and is located between the mounting plate and the lower die base, the buffer plate is connected with an elastic reset assembly and has an opening in the middle for the upper die to pass through; the auxiliary demolding assembly includes an ejection rod that moves synchronously with the buffer plate and has a top end corresponding to the demolding hole.

[0005] Preferably, a mezzanine is provided inside the buffer plate, a shield is horizontally slidably connected to the mezzanine, the shield initially closes the upper opening of the buffer plate, and the shield is synchronously opened by a transmission mechanism during the descent of the buffer plate.

[0006] Preferably, the transmission mechanism includes a rotating shaft rotatably arranged on one side of the buffer plate, a cylindrical gear and a second bevel gear are fixed on the rotating shaft, the cylindrical gear is engaged with a rack fixed on the machine table, the second bevel gear is engaged with the first bevel gear, the first bevel gear is fixed to one end of the threaded screw, a threaded block is threadedly connected to the threaded screw, and the threaded block is fixed to one side of the shield plate.

[0007] Preferably, the auxiliary demolding assembly also includes a connecting plate and a telescopic rod, and the connecting plate, telescopic rod and ejection rod are all located inside the machine; the telescopic rod is symmetrically and vertically arranged on the connecting plate, and one end passes through the table top of the machine and is fixedly connected to the bottom surface of the buffer plate; the ejection rod is upright in the middle of the connecting plate, and the top block on the top of the ejection rod passes through the table top of the machine and extends into the demolding hole.

[0008] Preferably, the elastic reset component is a second spring sleeved on the telescopic rod, the top end of the second spring abuts against the bottom surface of the buffer plate, and the bottom end of the second spring abuts against the machine table.

[0009] Preferably, a first spring is provided between the upper die seat and the buffer column, the first spring is sleeved on the outside of the buffer column, and the buffer column is slidably connected to a through hole preset in the mounting plate.

[0010] Preferably, an oil mist lubrication assembly is further included, wherein the oil mist lubrication assembly includes an oil mist device fixed on the stamping equipment, and the oil mist nozzles of the oil mist device are fixed on both sides of the buffer plate and face the stamping forming area.

[0011] Preferably, the top block is connected to the ejection rod body through a connecting rod, and a sleeve and a tension spring are provided at the connection, and the two ends of the tension spring are respectively fixed to the bottom end of the connecting rod and the inner bottom surface of the sleeve.

[0012] Preferably, a universal wheel with a foot cup is provided at the bottom of the machine.

[0013] A stamping method for solving the problem of dezincification of galvanized sheet by stamping, using the above-mentioned stamping equipment, includes the following steps: S1. Place the galvanized sheet on the upper surface of the buffer plate, start the oil mist lubrication component to spray oil mist toward the stamping area, and then start the stamping cylinder to drive the mounting plate downward; S2, the buffer plate contacts the lower die base first, and the elastic reset component provides buffer pressure to pre-press the galvanized sheet, while the transmission mechanism drives the shutter to open synchronously; S3, the mounting plate continues to move downward, and the upper die contacts the galvanized sheet with progressive pressure through the buffering effect of the buffer column and the first spring to complete the stamping process; S4. After stamping is completed, the stamping cylinder returns, and the buffer plate is reset under the action of the elastic reset component. At the same time, the ejection rod of the auxiliary demoulding component pushes the formed workpiece out of the lower die seat.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The synergistic effect of the buffer assembly and the progressive stamping mechanism significantly reduces the risk of impact damage to the zinc layer. The buffer plate contacts the lower die base at the initial stage of stamping, and the elastic reset assembly provides pre-compression force to stabilize the galvanized sheet. Subsequently, the upper die contacts the workpiece with progressive pressure via the buffer column and spring structure, avoiding the brittle fracture of the zinc layer caused by the instantaneous high pressure in traditional stamping. This design disperses the peak punching force, ensuring uniform stress on the zinc layer, thereby reducing dezincification, improving the surface integrity and corrosion resistance of the workpiece, and extending the life of the die. 2. With the help of auxiliary demoulding mechanism and lubrication protection, the zinc layer peeling caused by demoulding adhesion is effectively prevented. The ejection rod and buffer plate of the auxiliary demoulding component move synchronously, automatically ejecting the workpiece from the lower die seat after stamping is completed, avoiding the hard pulling damage caused by manual demoulding; combined with the oil mist lubrication component, a protective film is sprayed onto the forming area before stamping, reducing the friction coefficient between the workpiece and the die, doubly ensuring the integrity of the zinc layer during the demoulding process. This integrated design not only simplifies the operation process, but also reduces the subsequent re-plating cost and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the stamping equipment of the present invention; Figure 3 This is a schematic diagram of the structure of the buffer plate of the present invention; Figure 4 for Figure 1 A magnified view of the local structure at center A; Figure 5 for Figure 2 A magnified view of the local structure at point B in the middle; Figure 6 for Figure 3 A magnified view of the local structure at point C in the middle; Figure 7 1 is a side view and a cross-sectional schematic diagram of the buffer plate of the present invention; Figure 8 It is a schematic diagram of the ejection rod structure of the present invention.

[0016] The reference numerals in the drawings of the specification include: 1-stamping equipment, 11-stamping cylinder, 12-guide column, 13-support column, 14-mounting plate, 15-buffer plate, 151-shield, 152-thread block, 153-threaded screw, 154-first bevel gear, 155-optical axis, 156-connecting hole, 16-upper die seat, 161-upper die, 162-buffer column, 163-first spring, 164-column, 17-lower die seat, 171-demolition Mold hole, 2-transmission mechanism, 21-protective cover, 22-rotating shaft, 221-cylindrical gear, 222-second bevel gear, 23-rack, 3-auxiliary demoulding mechanism, 31-ejection rod, 311-top block, 312-connecting rod, 313-sleeve, 314-tension spring, 32-connecting plate, 33-telescopic rod, 331-second spring, 4-oil mist device, 41-oil mist nozzle, 5-machine table, 51-universal wheel. DETAILED DESCRIPTION

[0017] To help those skilled in the art better understand the present invention, the technical solutions of the present invention are clearly and completely described below with reference to the following embodiments. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0018] The present invention will be further explained below with reference to specific embodiments: See Figure 1-8 , a stamping equipment for solving the problem of dezincification of galvanized sheet metal stamping in this embodiment includes a stamping equipment 1 fixed on a machine table 5, the stamping equipment 1 includes a guide column 12, a stamping cylinder 11, a buffer assembly, a stamping forming assembly, and an auxiliary demoulding assembly; the piston rod of the stamping cylinder 11 is fixed downward with a mounting plate 14 that slides with the guide column 12; the stamping forming assembly includes an upper die base 16 and a lower die base 17, the upper die base 16 is connected to the mounting plate 14 through a buffer column 162, an upper die 161 is fixed to the bottom surface of the upper die base 16, and a demoulding hole 171 is provided in the die cavity of the lower die base 17; the buffer assembly includes a buffer plate 15 that slides with the guide column 12, which is located between the mounting plate 14 and the lower die base 17, the buffer plate 15 is connected to an elastic reset assembly and has an opening in the middle for the upper die 161 to pass through; the auxiliary demoulding assembly includes a push rod 31 that moves synchronously with the buffer plate 15 and the top end corresponds to the demoulding hole 171.

[0019] For details, see Figure 1The core equipment of this embodiment is a stamping device 1 fixed on a machine 5, wherein universal wheels 51 with foot cups are fixed to the four corners of the bottom of the machine 5 by bolts. The foot cups can be adjusted in height through threads to fix the machine 5, and the universal wheels 51 facilitate the overall movement of the equipment; the main body of the machine 5 is a hollow steel cabinet structure, the interior of which is used to set the control device and wiring. The control device includes a PLC controller, which can control the start of the hydraulic cylinder 11 and the opening of the oil mist lubrication component. The table top of the machine 5 is a steel plate with a boss fixed in the middle of the steel plate, which also serves as the bottom plate of the stamping device 1. The machine 5 is used to carry the stamping device 1. The frame of the stamping device 1 also includes two side panels and a horizontal plate on the top. The horizontal plate is mounted on the two side panels and is further fixed by four support columns 13. The support columns 13 are erected on the table top of the machine 5.

[0020] Among them, see Figure 2 There are 4 guide columns 12 in total, which are fixed to the top horizontal plate of the stamping equipment 1 and the table 5 of the machine by bolts at the upper and lower ends, and are vertically symmetrically distributed. The outer surface of the guide column 12 is plated with hard chrome to ensure the accuracy of sliding fit. The stamping cylinder 11 is a standard part, which is fixed to the center position of the top horizontal plate of the stamping equipment 1 by flange bolts. Its piston rod is set downward, and the end of the piston rod is fixed to the center of the upper surface of the mounting plate 14 by a bushing. The mounting plate 14 is a rectangular plate with sliding holes adapted to the guide columns 12 at the four corners. Copper sleeves are embedded in the sliding holes to achieve sliding fit with the guide columns 12. The mounting plate 14 can reciprocate up and down along the guide columns 12, and its movement stroke is controlled by the extension and contraction of the piston rod of the stamping cylinder 11.

[0021] Among them, see Figure 2 The stamping forming assembly includes an upper die base 16, a lower die base 17, an upper die 161, a buffer column 162 and a first spring 163. The lower die base 17 is fixed at the center of the table top of the machine 5. A rectangular die cavity is provided on its top (its specific size is customized according to the workpiece to be stamped). A demolding hole 171 is provided at the center of the bottom of the die cavity. The demolding hole 171 passes through the lower die base 17 and is connected to the through hole of the table top of the machine 5. The material of the upper die base 16 is the same as that of the lower die base 17. It has a rectangular structure. The upper die 161 is fixed on the lower surface (the shape of the upper die 161 is adapted to the die cavity of the lower die base 17). Buffer columns 162 are fixed at the four corners of the upper surface of the upper die base 16. A through hole is provided on the mounting plate 14 at the position corresponding to the buffer column 162. The top end of the buffer column 162 passes through the through hole, and a protrusion is provided at the top end of the buffer column 162 (away from the end of the mounting plate 14) to prevent the buffer column 162 from falling out of the through hole on the mounting plate 14. A first spring 163 is sleeved on the outside of the buffer column 162 . The top end of the first spring 163 abuts against the lower surface of the mounting plate 14 , and the bottom end abuts against the upper surface of the upper mold base 16 . The first spring 163 can achieve elastic buffering as the buffer column 162 expands and contracts.

[0022] Among them, see Figure 2-3 The buffer assembly includes a buffer plate 15, a shield plate 151, and an optical axis 155. The buffer plate 15 is located between the mounting plate 14 and the lower die base 17. Connecting holes 156 that adapt to the guide column 12 are provided at the four corners. Bushings are provided in the connecting holes 156, which enable sliding engagement with the guide column 12. A rectangular opening (larger than the outer dimensions of the lower die base 17) is provided in the middle of the buffer plate 15, through which the upper die 161 passes. A rectangular interlayer is provided inside the buffer plate 15 along its length. One side of the interlayer has an opening that connects to the outside, and the shield plate 151 is connected to the interlayer for horizontal sliding movement.

[0023] For details, see Figure 7 The shield 151 is located in the interlayer of the buffer plate 15. A threaded block 152 and a slider are fixed to the two opposite side surfaces of the shield 151. An optical axis 155 and a threaded screw 153 are horizontally arranged on the two opposite inner sides of the interlayer of the buffer plate 15. The threaded screw 153 is rotatably arranged in the interlayer through a bearing (not shown). The slider is sleeved on the optical axis 155, and the threaded block 152 is threadedly connected to the threaded screw 153. In the initial state, the shield 151 closes the rectangular opening in the middle of the buffer plate 15. After the stamping is completed, if zinc adheres to the upper die 161, the zinc may fall into the lower die base 17 during the upward movement of the upper die 161. By providing the shield 151, the contamination of the lower die base 17 when dezincification occurs during the stamping process can be minimized.

[0024] For further information, see Figure 3 and Figure 6 This embodiment also includes a transmission mechanism 2, which is used to drive the shutter 151 to open. The transmission mechanism 2 includes a rotating shaft 22, a cylindrical gear 221, a second bevel gear 222, a first bevel gear 154, a screw rod 153, a screw block 152, and a rack 23. The rotating shaft 22 is rotatably mounted on one side of the buffer plate 15 via two bearing seats. The cylindrical gear 221 and the second bevel gear 222 are both fixed to the rotating shaft 22 via a key connection. A rack 23 is vertically mounted on the front side of the machine table 5. The rack 23 meshes with the cylindrical gear 221. When the buffer plate 15 moves up and down, the cylindrical gear 221 can roll along the rack 23 and drive the rotating shaft 22 to rotate. The first bevel gear 154 is fixed to one end of the screw rod 153 and meshes with the second bevel gear 222. When the second bevel gear 222 rotates, it can drive the first bevel gear 154 and the screw rod 153 to rotate synchronously. When the screw rod 153 rotates, the screw block 152 can drive the shield 151 to slide horizontally along the optical axis 155, and the shield 151 can slide out from the side opening of the interlayer (see Figure 7 The rack 23 and the rotating shaft 22 of the transmission mechanism 2 are both arranged in the protective cover 21. The protective cover 21 is a U-shaped plate structure and is fixed to the side of the buffer plate 15 by bolts.

[0025] Among them, see Figure 3 The auxiliary demoulding assembly includes a push rod 31, a connecting plate 32, a telescopic rod 33, a second spring 331, a top block 311, a connecting rod 312, a sleeve 313, and a tension spring 314. The connecting plate 32 is a rectangular strip structure and is located in the internal cavity of the machine 5. There are two telescopic rods 33, which are symmetrically and vertically welded on both sides of the upper surface of the connecting plate 32. The top of the telescopic rod 33 passes through the preset through hole on the table of the machine 5 and is fixed to the lower surface of the buffer plate 15. When the buffer plate 15 moves up and down, it can drive the telescopic rod 33 to extend and retract along the through hole. The second spring 331 is sleeved on the outside of the telescopic rod 33. The top of the second spring 331 abuts the lower surface of the buffer plate 15, and the bottom end abuts the table of the machine 5, forming an elastic reset component of the buffer plate 15. When the buffer plate 15 descends, the second spring 331 is compressed. When returning, the elastic force of the second spring 331 drives the buffer plate 15 to reset. The ejection rod 31 is vertically welded to the center position of the upper surface of the connecting plate 32, and the top extends to the through hole of the table 5. The top block 311 is frustum-shaped and is connected to the main body of the ejection rod 31 through the connecting rod 312. The bottom end of the connecting rod 312 extends into the sleeve 313 at the bottom end of the ejection rod 31. The sleeve 313 is welded to the bottom end of the main body of the ejection rod 31 and is provided with a tension spring 314 inside. The top end of the tension spring 314 is fixed to the bottom end of the connecting rod 312, and the bottom end of the tension spring 314 is fixed to the inner bottom surface of the sleeve 313. The top end of the top block 311 passes through the through hole of the table 5 and extends to the demolding hole 171 of the lower mold base 17. When the connecting plate 32 moves up and down, it can drive the ejection rod 31 and the top block 311 to move synchronously to realize the demolding of the workpiece. The dimensions of the top block 311 match those of the demolding hole 171. Initially, the top block 311 is slightly higher than the demolding hole 171. As the connecting plate 32 pulls downward, the top surface of the top block 311 becomes flush with the bottom surface of the mold cavity of the lower mold base 17. Furthermore, as the connecting plate 32 is pulled downward, once the top block 311 is flush with the bottom surface of the mold cavity of the lower mold base 17, the tension spring 314 allows the connecting plate 32 to continue moving downward.

[0026] For further information, see Figure 4 , also includes an oil mist lubrication assembly, which includes an oil mist device 4 and oil mist nozzles 41. The oil mist device 4 is bolted to the inside of the two side panels of the stamping equipment 1. The oil inlet of the oil mist device 4 is connected to the lubricating oil tank, and the air outlet is connected to a plurality of oil mist nozzles 41 via a PU tube (not shown). The oil mist nozzles 41 are arranged at equal intervals and fixed to the side surfaces of the buffer plate 15 via fixing blocks, with the nozzles facing the stamping area (i.e., the shield 151). The oil mist device 4 can atomize the lubricating oil and spray it onto the surface of the galvanized sheet and the contact surface of the mold through the oil mist nozzles 41, reducing friction and protecting the zinc layer. The stamping cylinder 11 is not allowed to descend until the oil mist device 4 is activated and a single spray is completed by the PLC controller to prevent dezincification caused by lack of lubrication.

[0027] Furthermore, the galvanized sheet is stamped using the stamping equipment in the above embodiment, and the specific steps are as follows: S1, place the galvanized sheet to be stamped on the upper surface of the buffer plate 15, ensuring that the galvanized sheet covers the opening in the middle of the buffer plate 15; start the oil mist generator 4, and the oil mist generated by the oil mist generator 4 is sprayed toward the stamping area through the oil mist nozzle 41 to form an oil film on the surface of the galvanized sheet; then start the stamping cylinder 11, and the piston rod of the stamping cylinder 11 extends to drive the mounting plate 14 to move downward along the guide column 12.

[0028] S2, during the downward movement of the mounting plate 14, it will first contact and drive the buffer plate 15 to move downward along the guide column 12 (the buffer plate 15 is subjected to the downward pressure of the mounting plate 14); during the process, the second spring 331 is compressed to generate an elastic reaction force, and at the same time, the buffer plate 15 applies a pre-tightening force to the galvanized sheet to achieve stable positioning of the galvanized sheet; at the same time, during the downward movement of the buffer plate 15, the cylindrical gear 221 on its side rolls along the rack 23, driving the rotating shaft 22 and the second bevel gear 222 to rotate, and the second bevel gear 2 22 drives the meshed first bevel gear 154 and the threaded screw 153 to rotate, and the threaded block 152 moves horizontally along the threaded screw 153, driving the shield 151 to slide along the optical axis 155. When the buffer plate 15 contacts the lower die base 17, the shield 151 completely opens the opening in the middle of the buffer plate 15 to make way for the upper die 161. At the same time, the lower die base 17 passes through the middle opening of the buffer plate 15, and the upper surface of the buffer plate 15 is pressed to be flush with the upper surface of the lower die base 17, and is no longer affected by the downward pressure of the mounting plate 14.

[0029] S3, the mounting plate 14 continues to move downward under the drive of the stamping cylinder 11. At this time, the buffer column 162 slides downward along the through hole of the mounting plate 14, and the first spring 163 is compressed and generates a buffer force; the upper die 161 moves downward synchronously with the upper die base 16, passes through the opening in the middle of the buffer plate 15 and contacts the galvanized sheet. Under the buffering action of the first spring 163, the upper die 161 acts on the galvanized sheet with progressive pressure, so that the galvanized sheet enters the mold cavity of the lower die base 17 under pressure, completes plastic deformation, and forms a workpiece of the desired shape; in this process, the progressive pressure can prevent the zinc layer from rupturing due to instantaneous impact, and the oil film further reduces the friction damage between the mold and the zinc layer.

[0030] S4, after the stamping is completed, the piston rod of the stamping cylinder 11 is controlled to retract, driving the mounting plate 14 to return upward along the guide column 12; after the mounting plate 14 returns, the buffer plate 15 moves upward along the guide column 12 under the elastic reset force of the second spring 331, synchronously driving the telescopic rod 33 to move upward, and the connecting plate 32 moves up with the telescopic rod 33, thereby driving the ejection rod 31 and the ejector block 311 to move upward; the ejector block 311 pushes the formed workpiece upward in the demolding hole 171, ejecting the workpiece from the mold cavity of the lower mold base 17 to achieve demolding; at the same time, during the upward movement of the buffer plate 15, the cylindrical gear 221 rolls in the opposite direction along the rack 23, driving the baffle 151 to reset through the transmission mechanism 2, closing the opening in the middle of the buffer plate 15, and waiting for the next stamping cycle.

[0031] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A stamping device for solving the problem of dezincification of galvanized sheet metal during stamping, comprising a stamping device (1) fixed on a machine table (5), characterized in that: The stamping equipment (1) comprises a guide column (12), a stamping cylinder (11), a buffer component, a stamping forming component, and an auxiliary demoulding component; The piston rod of the punching oil cylinder (11) is fixed downward with a mounting plate (14) that is in sliding engagement with the guide column (12); The stamping forming assembly comprises an upper die base (16) and a lower die base (17); the upper die base (16) is connected to the mounting plate (14) via a buffer column (162); an upper die (161) is fixed to the bottom surface of the upper die base (16); and a demoulding hole (171) is provided in the die cavity of the lower die base (17); The buffer assembly includes a buffer plate (15) that is slidably engaged with the guide column (12), and is located between the mounting plate (14) and the lower die seat (17). The buffer plate (15) is connected to an elastic reset assembly and has an opening in the middle for the upper die (161) to pass through. The auxiliary demoulding component comprises a push rod (31) that moves synchronously with the buffer plate (15) and whose top end corresponds to the demoulding hole (171).

2. The stamping equipment for solving the problem of dezincification of galvanized sheet metal according to claim 1, characterized in that: The buffer plate (15) has an interlayer formed therein, and a shielding plate (151) is horizontally slidably connected to the interlayer. The shielding plate (151) initially closes the upper opening of the buffer plate (15). During the descent of the buffer plate (15), the shielding plate (151) is synchronously opened via the transmission mechanism (2).

3. The stamping equipment for solving the problem of dezincification of galvanized sheet metal according to claim 2, characterized in that: The transmission mechanism (2) includes a rotating shaft (22) rotatably arranged on one side of the buffer plate (15), a cylindrical gear (221) and a second bevel gear (222) being fixed on the rotating shaft (22), the cylindrical gear (221) being meshed with a rack fixed on the machine platform (5), the second bevel gear (222) being meshed with a first bevel gear (154), the first bevel gear (154) being fixed to one end of a threaded screw (153), a threaded block (152) being threadedly connected to the threaded screw (153), and the threaded block (152) being fixed to one side of the shielding plate (151).

4. The stamping equipment for solving the problem of dezincification of galvanized sheet metal according to claim 1, characterized in that: The auxiliary demoulding assembly further comprises a connecting plate (32) and a telescopic rod (33), wherein the connecting plate (32), the telescopic rod (33) and the ejection rod (31) are all located inside the machine (5); the telescopic rod (33) is symmetrically and vertically arranged on the connecting plate (32), and one end thereof passes through the table top of the machine (5) and is fixedly connected to the bottom surface of the buffer plate (15); the ejection rod (31) is vertically arranged in the middle of the connecting plate (32), and the top block (311) on the top of the ejection rod (31) passes through the table top of the machine (5) and extends into the demoulding hole (171).

5. The stamping equipment for solving the problem of dezincification of galvanized sheet according to claim 4, characterized in that: The elastic reset component is a second spring (331) sleeved on the telescopic rod (33), the top end of the second spring (331) abuts against the bottom surface of the buffer plate (15), and the bottom end of the second spring (331) abuts against the table surface of the machine (5).

6. The stamping equipment for solving the problem of dezincification of galvanized sheet metal according to claim 1, characterized in that: A first spring (163) is provided between the upper die seat (16) and the buffer column (162), wherein the first spring (163) is sleeved on the outside of the buffer column (162), and the buffer column (162) is slidably connected to a through hole preset in the mounting plate (14).

7. The stamping equipment for solving the problem of dezincification of galvanized sheet according to claim 1, characterized in that: It also includes an oil mist lubrication assembly, which includes an oil mist device (4) fixed on the stamping equipment (1), and the oil mist nozzles (41) of the oil mist device (4) are fixed on both sides of the buffer plate (15) and face the stamping area.

8. The stamping equipment for solving the problem of dezincification of galvanized sheet metal according to claim 4, characterized in that: The top block (311) is connected to the main body of the ejection rod (31) via a connecting rod (312), and a sleeve (313) and a tension spring (314) are provided at the connection. The two ends of the tension spring (314) are respectively fixed to the bottom end of the connecting rod (312) and the inner bottom surface of the sleeve (313).

9. The stamping equipment for solving the problem of dezincification of galvanized sheet according to claim 1, characterized in that: A universal wheel (51) with a foot cup is provided at the bottom of the machine (5).

10. A stamping method for solving the problem of dezincification of galvanized sheet metal, using the stamping equipment for solving the problem of dezincification of galvanized sheet metal according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1. Place the galvanized sheet on the upper surface of the buffer plate (15), first start the oil mist lubrication component to spray oil mist toward the stamping area, and then start the stamping cylinder (11) to drive the mounting plate (14) downward; S2, the buffer plate (15) first contacts the lower die base (17), and the elastic reset component provides buffer pressure to pre-press the galvanized sheet, while the transmission mechanism (2) drives the shutter (151) to open synchronously; S3, the mounting plate (14) continues to move downward, and the upper die (161) contacts the galvanized sheet with progressive pressure through the buffering effect of the buffer column (162) to complete the stamping process; S4. After the stamping is completed, the stamping cylinder (11) returns, and the buffer plate (15) is reset under the action of the elastic reset component. At the same time, the ejection rod (31) of the auxiliary demoulding component ejects the formed workpiece out of the lower die base (17).

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