Stamping process for complex profile of metal sheet

Abstract

The present invention relates to the field of stamping forming technology, and discloses a metal sheet complex surface stamping forming process, including a die structure, a convex die structure and an exhaust structure, wherein the lower part of the die structure is fixed to the ground by a table leg, the upper end of the table leg is fixedly connected to a lower table, the upper end of the lower table is fixedly connected to a support table, a die is arranged at the upper end of the support table, a lower vent is arranged inside the die, and lower air holes are arranged above the lower vent, the lower air holes are connected to the lower vent and are evenly distributed inside the die. The present invention can clean the die by providing an air pump, an exhaust pump and a pipeline, and can also adsorb and fix the metal sheet placed on the die to prevent the metal sheet from changing position during the stamping process and affecting the accuracy, and can adsorb the metal sheet after stamping by the convex die to prevent the metal sheet from being unable to be separated from the die due to the soft material.

Description

Technical Field

[0001] The invention relates to the technical field of stamping and forming, in particular to a complex-profile stamping process for metal plates. Background Art

[0002] Stamping is a process that uses a press and a die to apply external force to plates, strips, tubes and profiles to cause plastic deformation or separation, thereby obtaining a workpiece (stamping part) of the desired shape and size. This technology mainly relies on the plastic deformation ability of the material. Under the action of the die, the material is deformed into a preset shape.

[0003] However, during the stamping process today, metal sheets may crack in the middle of the bulge due to the thin wall thickness when the metal material is pushed downward during stamping, resulting in stamping failure and cost loss. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a complex surface stamping process for metal plates, which has the advantages of preventing metal plates from cracking during stamping, facilitating mold cleaning and being simple to operate, thereby solving the problems in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of preventing metal plates from cracking during stamping and facilitating mold cleaning and simple operation, the present invention provides the following technical solution: a complex surface stamping process for metal plates, including a die structure, a punch structure and an exhaust structure.

[0008] Preferably, table legs are provided below the die structure, and the die structure is fixed to the ground by the table legs, the upper ends of the table legs are fixedly connected to a lower table top, the upper end of the lower table top is fixedly connected to a support platform, a die is provided on the upper end of the support platform, a lower vent is provided inside the die, lower air holes are provided above the lower vent, the lower air holes are communicated with the lower vent, and are evenly distributed inside the die.

[0009] Preferably, the male mold structure is fixed to the lower table surface through a supporting column, the supporting column is fixedly provided with an upper platform, a fixed platform is fixedly provided below the upper platform, the middle of the fixed platform is hollow, and a card strip is movably connected inside the hollow, a first limiting card block is provided at the top of the card strip, and a second limiting card block is provided below the hollow middle of the fixed table, which can limit the movement of the card strip to prevent it from slipping, and ensure that the card strip can move up and down on the bottom of the fixed platform without being dislocated, and the card strip is meshed with the gear.

[0010] Preferably, a vertical rod is provided below the fixed platform, and the rotating shafts at both ends of the small gear are fixedly connected to the lower end of the fixed platform through the vertical rod, the outer wall of the small gear is meshed with a large gear, the motor is fixedly connected to the bottom of the fixed platform, the large gear is fixedly connected to the output shaft of the motor, a punch is fixedly connected to the lower end of the clamping strip, an upper vent is provided inside the punch, upper air holes are provided below the upper vent, the upper air holes are communicated with the upper vent, the upper air holes are evenly distributed inside the punch, and a gas rod is fixedly connected above the punch, the number of the gas rods is four, and the top ends of the four gas rods are fixedly connected to connecting pipes, the connecting pipes are arranged inside the fixed platform, and the connecting pipes are annularly connected, and the four gas rods are interconnected through the connecting pipes.

[0011] Preferably, the air extraction structure includes a hose, a first pipe, a second pipe, a third pipe, a first solenoid valve, a second solenoid valve, an air pump and an air extraction pump, one end of the hose is connected to the upper vent, the first pipe is fixedly connected to the other end of the hose, the end of the first pipe is connected to the lower vent, the second pipe is fixedly connected to the middle end of the first pipe, the second solenoid valve is arranged on the first pipe at the junction of the first pipe and the support platform, the air extraction pump and the air extraction pump are respectively connected to the ends of the second pipe through a tee, the third pipe is connected to the upper end of the first pipe and communicates with the first pipe, and the other end of the third pipe is communicated with the connecting pipe.

[0012] Preferably, the first solenoid valve is arranged on the third pipeline, the hose can change length with the position of the punch, the first solenoid valve and the second solenoid valve are in an open state, the gas in the first pipeline, the second pipeline and the third pipeline is connected, and the upper air hole and the upper vent are connected to the gas in the first pipeline, the lower air hole and the lower vent are connected to the gas in the first pipeline, and the gas rod and the connecting pipe are connected to the gas in the third pipeline.

[0013] Preferably, the diameter of a single air hole in the lower air hole in the concave die structure and the upper air hole in the punch structure can be set to 0.2 mm to 0.4 mm, which can prevent the air holes from affecting the stamping accuracy of the metal plate and ensure air circulation.

[0014] Preferably, the stamping process comprises the following specific steps:

[0015] Step 1: Use an air pump to clean the mold.

[0016] Step 2: Punch out a volume of material slightly larger than the required volume from the metal sheet.

[0017] Step 3: The punch is used for stamping, and the stamping is gradually formed through multi-step expansion.

[0018] Step 4: Separate the punch and die, and remove the stamped parts after stamping is completed.

[0019] Preferably, the step 2 further includes the following:

[0020] Turn on the air pump and close the air pump, open the first solenoid valve and close the second solenoid valve, so that the air rod is inflated, the air rod gradually extends, turn on the motor to make the pinion start to rotate clockwise, drive the card strip to move downward, and at the same time the punch moves downward until the metal sheet placed on the die is punched out of more than the required volume of material, the air pump stops working, and the motor is turned off and the pinion stops rotating.

[0021] After more material than required is flushed out, turn off the air pump and turn on the vacuum pump. The first solenoid valve is opened and the second solenoid valve is closed, so that the air rod is in the vacuum state. The air rod will gradually shorten. When the pinion rotates counterclockwise, it will drive the card strip to move upward, and the punch will also move up until the punch is reset, the motor pinion stops rotating, and the air pump stops working.

[0022] Preferably, the step three also includes the following:

[0023] The vacuum pump starts to work and opens the second solenoid valve and closes the first solenoid valve. Because the metal plate is placed above the die, the lower air hole is not connected to the atmosphere, and the air pressure in the pipeline is negative. The pressure in the pipeline is 1×10 -2 Pa~5×10 -2 Pa, so that the metal plate is adsorbed, at this time, the second solenoid valve and the vacuum pump are closed, the lower vent and the connected pipeline are still in a negative pressure state, the metal plate is always adsorbed, to prevent the metal plate from moving during the stamping process, affecting the stamping accuracy of the metal plate;

[0024] At this time, turn on the air pump, turn on the first solenoid valve, put the air rod in an inflated state, and gradually extend the air rod. Turn on the motor pinion and start to rotate clockwise, driving the card strip to move downward, driving the punch to move downward, until the punch contacts the metal plate, close the first solenoid valve, turn off the motor pinion and stop rotating. According to the required stamping depth h of the metal sheet, the punch is divided into multiple steps to descend, such as: first descend the punch by h / 2, initially forming, and then descend the punch by h / 4, and then descend the punch by h / 8, h / 16, until it is completely formed. In this process, open the first solenoid valve and turn on the motor to make the pinion rotate. The punch is moved to the required height, and then the first solenoid valve is closed, and the motor is turned off to stop the rotation of the pinion. This process is repeated for multiple steps to gradually push the material at the chamfer of the inner hole upward, so as to avoid the situation in which the wall thickness is too small to cause cracking in the middle of the convex hull during the unidirectional downward movement of the outer surface material in each step. The excess material on the outside of the convex hull is squeezed until the workpiece with no dimensional accuracy requirement is located on the upper surface of the outside of the convex hull. The existence of the pinion can well control the height of the card strip descent, and complete the gradual stamping of the metal plate. At the same time, the air discharged from the upper air hole during the stamping process can reduce the temperature of the metal plate caused by stamping.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention provides a complex surface stamping process for metal sheets, which has the following beneficial effects:

[0027] 1. The metal sheet complex surface stamping process can be divided into multiple steps by setting the motor, gear and gas rod to prevent the cracking of the middle part of the bulge caused by the wall thickness being too small during the stamping process. The height of the punch can be controlled to achieve the required stamping effect and reduce cost losses.

[0028] 2. The metal plate complex surface stamping process, through the provision of vacuum pump and inflation pump, can make the metal plate adsorbed with the mold during stamping to prevent displacement causing stamping precision errors. At the same time, it can be well separated from the mold after stamping is completed to prevent the metal plate from being difficult to separate from the mold due to its soft material, reduce manual intervention in the stamping process, and quickly cool down the annealed metal plate to prevent it from rebounding and affecting the stamping precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the punch of the present invention;

[0031] Figure 3 It is an enlarged view of the male mold structure A of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the concave mold of the present invention;

[0033] Figure 5 This is a schematic diagram of the air extraction structure of the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the male mold structure of the present invention;

[0035] Figure 7 It is a schematic diagram of the concave mold in the concave mold structure of the present invention;

[0036] Figure 8 It is the work flow chart of the present invention.

[0037] In the figure:

[0038] 1. Concave mold structure; 101. Table legs; 102. Lower table top; 103. Support table; 104. Concave mold; 105. Lower vent; 106. Lower air hole;

[0039] 2. Punch structure; 201. Upper platform; 202. Support column; 203. Fixed platform; 204. First limit block; 205. Card strip; 206. Small gear; 207. Punch; 208. Upper vent; 209. Upper air hole; 210. Gas rod; 211. Connecting pipe; 212. Motor; 213. Large gear; 214. Second limit block;

[0040] 3. Air extraction structure; 301. Hose; 302. First pipeline; 303. Second pipeline; 304. Third pipeline; 305. First solenoid valve; 306. Second solenoid valve; 307. Air pump; 308. Air extraction pump. DETAILED DESCRIPTION

[0041] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0042] Example 1

[0043] The preferred embodiment of the metal plate complex surface stamping process provided by the present invention is as follows: Figures 1 to 7 As shown: a complex-profile stamping device for metal sheets, comprising a die structure 1, a punch structure 2 and an exhaust structure 3.

[0044] In this embodiment, a table leg 101 is arranged below the die structure 1, and the die structure 1 is fixed to the ground by the table leg 101. The upper end of the table leg 101 is fixedly connected to a lower table top 102, and the upper end of the lower table top 102 is fixedly connected to a support platform 103. A die 104 is arranged on the upper end of the support platform 103. A lower vent 105 is arranged inside the die 104. Lower air holes 106 are arranged above the lower vent 105. The lower air holes 106 are communicated with the lower vent 105 and are evenly distributed inside the die 104.

[0045] Furthermore, the male mold structure 2 is fixed to the lower table 102 by a support column 202, and the support column 202 is fixedly provided with an upper platform 201, and a fixed platform 203 is fixedly provided below the upper platform 201. The middle of the fixed platform 203 is hollow, and a clip 205 is movably connected inside the hollow, and a first limit block 204 is provided at the top of the clip 205, and a second limit block 214 is provided below the hollow inside the middle of the fixed platform 203, which can limit the movement of the clip 205 to prevent it from slipping, and ensure that the clip 205 can move up and down at the bottom of the fixed platform 203 without being dislocated, and the clip 205 is meshed with the gear 206, and a vertical rod is provided below the fixed platform 203, and the rotating shafts at both ends of the pinion 206 are fixedly connected to the lower end of the fixed platform 203 through the vertical rod. A large gear 213 is meshed with the outer wall of 206, and the motor 212 is fixedly connected to the bottom of the fixed platform 203. The large gear 213 is fixedly connected to the output shaft of the motor 212. The lower end of the clamping strip 205 is fixedly connected to the punch 207, and an upper vent 208 is arranged inside the punch 207. An upper air hole 209 is arranged below the upper vent 208. The upper air hole 209 is communicated with the upper vent 208, and the upper air holes 209 are evenly distributed inside the punch 207. A gas rod 210 is fixedly connected above the punch 207. There are four gas rods 210, and the tops of the four gas rods 210 are fixedly connected to connecting pipes 211. The connecting pipes 211 are arranged inside the fixed platform 203, and the connecting pipes 211 are arranged in a ring-shaped interconnected manner, and the four gas rods 210 are interconnected through the connecting pipes 211.

[0046] The diameter of each of the lower air hole 106 in the die structure 1 and the upper air hole 209 in the punch structure 2 can be set to 0.2mm~0.4mm, so that the metal plate will not be stamped in the air hole, which can prevent the air hole from affecting the stamping accuracy of the metal plate and ensure air circulation.

[0047] When the motor 212 is turned on to drive the large gear 213 to rotate, and the large gear 213 drives the small gear 206 to rotate clockwise, it will drive the clamping strip 205 to move downward. When the small gear 206 rotates counterclockwise, it will drive the clamping strip 205 to move upward. The up and down movement of the clamping strip 205 can be controlled by controlling the motor 212 to drive the large gear to rotate in different directions and the small gear 206 to rotate in different directions, thereby changing the up and down movement of the punch 207. At the same time, the height of the punch 207 rising or falling can be controlled by controlling the working power of the motor 212 to control the number of circles of the small gear 206.

[0048] The air extraction structure 23 includes a hose 301, a first pipe 302, a second pipe 303, a third pipe 304, a first solenoid valve 305, a second solenoid valve 306, an air pump 307 and an air extraction pump 308. One end of the hose 301 is connected to the upper vent 208, the first pipe 302 is fixedly connected to the other end of the hose 301, the end of the first pipe 302 is connected to the lower vent 105, the second pipe 303 is fixedly connected to the middle end of the first pipe 302, the second solenoid valve 306 is arranged on the first pipe 302 at the junction of the first pipe 302 and the support platform 103, the air extraction pump 308 and the air extraction pump 307 are respectively connected to the end of the second pipe 303 through a tee, and the third pipe 304 is connected to the upper end of the first pipeline 302 and communicates with the first pipeline 302, the other end of the third pipeline 304 is communicated with the connecting pipe 211, the first solenoid valve 305 is set on the third pipeline 304, the hose 301 can change the length with the position of the punch 207, the first solenoid valve 305 and the second solenoid valve 306 are in an open state, the gas in the first pipeline 302, the second pipeline 303 and the third pipeline 304 are communicated, and the upper air hole 209 and the upper vent 208 are communicated with the gas in the first pipeline 302, the lower air hole 106 and the lower vent 105 are communicated with the gas in the first pipeline 302, and the gas rod 210 and the connecting pipe 211 are communicated with the gas in the third pipeline 304.

[0049] The air pump 307 is turned on and the air pump 308 is turned off. The first solenoid valve 305 is turned on and the second solenoid valve 306 is turned off, so that the gas rod 210 is in an inflated state, and the gas rod 210 gradually extends. At the same time, when the motor 212 is turned on to rotate the pinion 206 clockwise, the card strip 205 is driven to move downward, and the punch 207 also moves downward. When the motor 212 is turned off to stop the pinion 206 from rotating, the air pump 307 stops working; the air pump 307 is turned off and the air pump 308 is turned on. The first solenoid valve 305 is turned on and the second solenoid valve 306 is turned off, so that the gas rod 210 is in an inflated state, and the gas rod 210 will gradually shorten. At the same time, the motor 212 is turned on to stop the pinion 206 from rotating. When 206 rotates counterclockwise, it will drive the clamping strip 205 to move upward, and the punch 207 will also move upward. When the motor 212 is turned off and the pinion 206 stops rotating, the air pump 307 stops working. The working state of the motor 212 can be controlled to make the pinion 206 rotate in different directions to control the up and down movement of the clamping strip 205. At the same time, the state of the gas rod 210 can be controlled to change the up and down movement of the punch 207. The gas rod 210 can prevent the punch 207 from shaking when it moves up and down, and also prevent the punch 207 from suddenly slipping. At the same time, the working power of the motor 212 can be controlled to control the number of circles of the pinion 206 to control the rising or falling height of the punch 207.

[0050] Example 2

[0051] On the basis of Example 1, a preferred embodiment of the metal plate complex surface stamping process provided by the present invention is as follows: Figures 1 to 8 As shown: The stamping process has the following specific steps:

[0052] Step 1: Use the air pump 307 to clean the mold.

[0053] Specifically, before starting stamping, turn on the inflation pump 307 and turn off the exhaust pump 308, open the first solenoid valve 305 and the second solenoid valve 306, so that the gas rod 210 is inflated, and the gas rod 210 gradually extends. Turn on the motor 212 to make the pinion 206 start to rotate clockwise, driving the card bar 205 to move downward, and at the same time the punch 207 moves downward until the punch 207 descends and is relatively close to the die 104. Because the upper air hole 209 and the lower air hole 106 are connected to the atmosphere, air rushes out from the upper air hole 209 and the lower air hole 106, which can blow away the floating dust on the surface of the die 104, clean the dust on the die 104, and prevent dust from clogging the lower air hole 106, thereby preventing dust from affecting the accuracy of stamping.

[0054] Step 2: Punch out a volume of material slightly larger than the required volume from the metal sheet.

[0055] Specifically, the air pump 307 is turned on and the air pump 308 is turned off, the first solenoid valve 305 is opened and the second solenoid valve 306 is closed, so that the gas rod 210 is inflated, the gas rod 210 gradually extends, and the motor 212 is turned on to make the pinion 206 start to rotate clockwise, driving the card strip 205 to move downward, and the punch 207 moves downward at the same time until the metal sheet placed on the die 104 is punched out with more material than the required volume, the air pump 307 stops working, and the motor 212 is turned off and the pinion 206 stops rotating.

[0056] After more material than required is flushed out, the air pump 307 is turned off and the air extraction pump 308 is turned on. The first solenoid valve 305 is turned on and the second solenoid valve 306 is closed, so that the gas rod 210 is in a vacuum state. The gas rod 210 will gradually shorten. When the pinion 206 rotates counterclockwise, it will drive the card strip 205 to move upward, and the punch 207 will also move up until the punch 207 is reset, the motor 212 is turned off, the pinion 206 stops rotating, and the air pump 307 stops working.

[0057] Step 3: The punch 207 is punched and gradually formed by multi-step expansion.

[0058] Specifically, the vacuum pump 308 starts working and opens the second solenoid valve 306 and closes the first solenoid valve 305. Because the metal plate is placed above the die 104, the lower air hole 106 is not connected to the atmosphere, and the air pressure in the pipeline is negative. The pressure in the pipeline is 1×10 -2 Pa~5×10 -2Pa, so that the metal plate is adsorbed, at this time, the second solenoid valve 306 and the air pump 308 are closed, the lower vent 105 and the connected pipeline are still in a negative pressure state, the metal plate is always adsorbed, and the metal plate is prevented from moving during the stamping process, which affects the stamping accuracy of the metal plate;

[0059] At this time, the air pump 307 is turned on, and the first solenoid valve 305 is turned on to put the gas rod 210 in an inflated state. The gas rod 210 gradually extends, and the motor 212 is turned on and the pinion 206 starts to rotate clockwise, driving the card strip 205 to move downward, driving the punch 207 to move downward, until the punch 207 contacts the metal plate, and the first solenoid valve 305 is closed, and the motor 212 pinion 206 stops rotating. According to the required stamping depth h of the metal plate, the punch 207 is divided into multiple steps to be lowered, such as: firstly lowering the punch 207 by h / 2 to form a preliminary shape, and then lowering the punch 207 by h / 4, and then lowering the punch 207 by h / 8, h / 16, until it is completely formed. In this process, the first solenoid valve 305 is opened at the same time. 05 and turn on the motor 212 to rotate the pinion 206, so that the punch 207 drops to the required height, then close the first solenoid valve 305, and turn off the motor 212 to stop the pinion 206 from rotating, and repeat this process for multiple steps to gradually push the material at the chamfer of the inner hole upward, so as to avoid the situation in which the wall thickness is too small to cause cracking in the middle of the convex hull during the unidirectional downward movement of the outer surface material in each step, and the excess material on the outside of the convex hull is squeezed to the workpiece without dimensional accuracy requirements located on the upper surface of the outside of the convex hull. The existence of the pinion 206 can well control the height of the descent of the card strip 205 to complete the gradual stamping of the metal plate. At the same time, the air discharged from the upper air hole 209 during the stamping process can reduce the temperature of the punched metal plate caused by stamping.

[0060] Step 4: The punch 207 is separated from the die 104, and the stamped part is removed after the stamping is completed.

[0061] Specifically, after the metal plate is stamped and formed, the second solenoid valve 306 is opened first to balance the air pressure in the first pipeline 302 and keep it in the atmospheric pressure state. The metal plate is no longer adsorbed by the die 104. The vacuum pump 308 is opened, the first solenoid valve 305 is opened, and the second solenoid valve 306 is closed to keep the gas rod 210 in the vacuum state. The gas rod 210 will gradually shorten. When the motor 212 is turned on and the pinion 206 rotates counterclockwise, the card strip 205 will be driven to move upward, and the punch 207 will also move upward. At the same time, in the initial state, the metal plate is in contact with the punch 207, and the upper air hole 209 is not connected to the atmosphere. The air pressure in the pipeline is negative pressure. At this time, the air pressure in the pipeline is 1×10 -3 Pa~5×10 -3Pa, so that the metal plate is adsorbed by the punch 207, and rises together with the punch 207, so that the metal plate after stamping is separated from the die 104. When the vacuum pump 308 and the first solenoid valve 305 are closed, the inflation pump 207 is opened to restore the air pressure in the pipeline to the atmospheric pressure state, the metal plate can be separated from the punch 207 and taken away, which can prevent the metal plate to be formed from being difficult to separate from the die 104 due to the soft material of the metal plate.

[0062] In summary, the die 104 can be cleaned by the set air pump 307, the vacuum pump 308 and the pipeline, and the metal sheet placed on the die 104 can be adsorbed and fixed in position to prevent the metal sheet from changing position and affecting the accuracy during the stamping process, and the metal sheet after stamping can be adsorbed by the punch 207 to prevent the metal sheet from being unable to be separated from the die 107 due to its soft material; the gas rod 210, the pinion 206 and the clamping strip 205 can be used to control the descending height of the punch 207 to complete the multi-step stamping of the metal sheet, which can prevent the metal sheet from cracking in the middle of the bulge due to the wall thickness being too small during the stamping process.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal plate complex surface stamping device, comprising a die structure (1), a punch structure (2) and an exhaust structure (3), characterized in that: The bottom of the concave mold structure (1) is provided with table legs (101); the bottom of the concave mold structure (1) is fixed to the ground by the table legs (101); the upper ends of the table legs (101) are fixedly connected to a lower table top (102); the upper end of the lower table top (102) is fixedly connected to a support platform (103); the upper end of the support platform (103) is provided with a concave mold (104); a lower vent (105) is provided inside the concave mold (104); lower air holes (106) are provided above the lower vent (105); the lower air holes (106) are communicated with the lower vent (105) and are evenly distributed inside the concave mold (104); The male mold structure (2) is fixed to the lower table surface (102) via a support column (202); the support column (202) is fixedly provided with an upper platform (201); a fixed platform (203) is fixedly provided below the upper platform (201); the fixed platform (203) is hollow in the middle, and a clamping strip (205) is movably connected inside the hollow; a first limiting clamping block (204) is provided at the top of the clamping strip (205); a second limiting clamping block (214) is provided below the hollow in the middle of the fixed platform (203), which can limit the movement of the clamping strip (205) to prevent it from slipping, thereby ensuring that the clamping strip (205) can move up and down at the bottom of the fixed platform (203) without being dislocated; a small gear (206) is meshed on one side of the clamping strip (205); A vertical rod is provided below the fixed platform (203); the rotating shafts at both ends of the pinion gear (206) are fixedly connected to the lower end of the fixed platform (203) via the vertical rod; a large gear (213) is meshed with the outer wall of the pinion gear (206); a motor (212) is provided below the fixed platform (203); the large gear (213) is fixedly connected to the output shaft of the motor (212); a convex mold (207) is fixedly connected to the lower end of the clamping strip (205); an upper vent (208) is provided inside the convex mold (207); and a Upper air holes (209), the upper air holes (209) being in communication with the upper ventilation openings (208), the upper air holes (209) being evenly distributed inside the male mold (207), the upper part of the male mold (207) being fixedly connected with an air rod (210), the number of the air rods (210) being four, the top ends of the four air rods (210) being fixedly connected with a connecting pipe (211), the connecting pipe (211) being arranged inside the fixed platform (203), the connecting pipe (211) being arranged in an annular interconnection, and the four air rods (210) being interconnected through the connecting pipe (211); The air extraction structure (3) comprises a hose (301), a first pipe (302), a second pipe (303), a third pipe (304), a first solenoid valve (305), a second solenoid valve (306), an air pump (307) and an air extraction pump (308); one end of the hose (301) is connected to the upper vent (208); the first pipe (302) is fixedly connected to the other end of the hose (301); the end of the first pipe (302) is connected to the lower vent (105); the second pipe (306) is connected to the lower vent (105); and the third pipe (304) is connected to the lower vent (105). 03) is fixedly connected to the middle end of the first pipeline (302), the second solenoid valve (306) is arranged on the first pipeline (302) at the junction of the first pipeline (302) and the support platform (103), the vacuum pump (308) and the inflation pump (307) are respectively connected to the ends of the second pipeline (303) through three-way connections, the third pipeline (304) is connected to the upper end of the first pipeline (302) and communicates with the first pipeline (302), and the other end of the third pipeline (304) is communicated with the connecting pipe (211).

2. The complex-profile stamping device for metal sheets according to claim 1, characterized in that: The first solenoid valve (305) is arranged on the third pipeline (304), the hose (301) can change its length according to the position of the punch (207), the first solenoid valve (305) and the second solenoid valve (306) are in an open state, the gas in the first pipeline (302), the second pipeline (303) and the third pipeline (304) are in communication, the upper air hole (209) and the upper ventilation port (208) are in communication with the gas in the first pipeline (302), the lower air hole (106) and the lower ventilation port (105) are in communication with the gas in the first pipeline (302), and the connecting pipe (211) in communication with the third pipeline (304) is also provided with a gas rod (210).

3. The complex-profile stamping device for metal sheets according to claim 1, characterized in that: The diameter of a single air hole in the lower air hole (106) in the concave die structure (1) and the upper air hole (209) in the convex die structure (2) can be set to 0.2 mm to 0.4 mm, which can prevent the air hole from affecting the stamping accuracy of the metal plate and ensure air circulation.

4. A metal sheet complex surface stamping process, applicable to a metal sheet complex surface stamping device as claimed in claim 1, characterized in that: The stamping process has the following specific steps: Step 1: Clean the mold using an air pump (307); Step 2: Punch out a volume of material slightly larger than the required volume from the metal sheet; Step 3: The punch (207) is punched and gradually formed by multi-step expansion; Step 4: Separate the punch (207) from the die (104) and remove the stamped part after stamping is completed. ； The step 2 also includes the following contents: The air pump (307) is turned on and the air pump (308) is turned off. The first solenoid valve (305) is turned on and the second solenoid valve (306) is turned off, so that the gas rod (210) is in an inflated state. The gas rod (210) is gradually extended. The motor (212) is turned on to make the pinion (206) start to rotate clockwise, driving the clamping strip (205) to move downward. At the same time, the punch (207) moves downward until the metal sheet placed on the die (104) is punched out with a material of a volume greater than the required volume. The air pump (307) stops working, and the motor (212) is turned off to make the pinion (206) stop rotating. After more material than required is flushed out, the air pump (307) is turned off and the air extraction pump (308) is turned on. The first solenoid valve (305) is turned on and the second solenoid valve (306) is turned off, so that the gas rod (210) is in a state of exhausting air. The gas rod (210) is gradually shortened. When the pinion (206) rotates counterclockwise, the card strip (205) is driven to move upward, and the punch (207) is also moved upward until the punch (207) is reset, the motor (212) is turned off, the pinion (206) stops rotating, and the air pump (307) stops working. ； The step three also includes the following contents: The vacuum pump (308) starts to work and opens the second solenoid valve (306) and closes the first solenoid valve (305). Because the metal plate is placed above the die (104), the lower air hole (106) is not connected to the atmosphere, and the air pressure in the pipeline is negative. The pressure in the pipeline is 1×10 -2 Pa~5×10 -2 Pa, so that the metal plate is adsorbed, at this time the second solenoid valve (306) and the vacuum pump (308) are closed, the lower vent (105) and the connected pipeline are still in a negative pressure state, the metal plate is always adsorbed, and the metal plate is prevented from moving during the stamping process, which affects the stamping accuracy of the metal plate; At this time, the air pump (307) is turned on, and the first solenoid valve (305) is turned on to put the air rod (210) in an inflated state. The air rod (210) gradually extends, and the motor (212) is turned on and the pinion (206) begins to rotate clockwise, driving the card strip (205) to move downward, driving the punch (207) to move downward, until the punch (207) contacts the metal plate, and the first solenoid valve (305) is closed, and the motor (212) pinion (206) stops rotating. According to the required stamping depth h of the metal plate, the punch (207) is divided into multiple steps to be lowered, such as: firstly lowering the punch (207) by h / 2 to form a preliminary shape, and then lowering the punch (207) by h / 4, and then lowering the punch (207) by h / 8, h / 16, until it is completely formed. In this process, the punch (207) is turned on at the same time. The first solenoid valve (305) is opened and the motor (212) is turned on to rotate the pinion (206), so that the punch (207) is lowered to the required height, and then the first solenoid valve (305) is closed, and the motor (212) is turned off to stop the pinion (206) from rotating. This process is repeated for multiple steps to gradually push the material at the chamfer of the inner hole upward, thereby avoiding the situation in which the wall thickness is too small to cause cracking in the middle of the convex hull during the unidirectional downward movement of the outer surface material in each step. The excess material on the outer side of the convex hull is squeezed until the workpiece with no sample size accuracy requirement is located on the upper surface of the outer side of the convex hull. The existence of the pinion (206) can well control the height of the descent of the clamping strip (205), and complete the gradual stamping of the metal plate. At the same time, the air discharged from the upper air hole (209) during the stamping process can reduce the temperature of the stamped metal plate caused by stamping.

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