A press for metal sheet processing

Abstract

The present invention discloses a press for processing metal sheets, which relates to the technical field of stamping dies and includes: a machine body, two first connecting plates are fixedly connected to the top of the machine body, and a first die, a second die, and a third die are fixedly connected in sequence from bottom to top between the two first connecting plates. A first stamping groove is formed inside the first die, and a second stamping groove is formed inside the second die. By providing a stamping mechanism and an opening mechanism, the stamping head moves downward. After the metal sheet is stamped once, it stays for a period of time and then undergoes the next stamping. In this way, the stress inside the metal sheet has time to redistribute, thereby reducing stress concentration. At the same time, during staged stamping, since the deformation amount in each stage is relatively small and there is a pause time, the metal sheet can gradually adapt to the deformation in each stage, thereby reducing the springback amount of the metal sheet.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping dies, and specifically to a press for processing metal sheets. Background Art

[0002] Metal sheets are flat products mainly made of metal materials. In production and life, they need to be processed into various shapes to meet the functional requirements, structural requirements, assembly characteristics, and design goals of different fields. By shape design (such as bending, ribbing, bossing), the strength, stiffness, and anti-deformation ability of parts are enhanced, and specific shapes (such as holes, lugs, card slots) are processed to achieve precise assembly with other parts. Therefore, special stamping equipment is required to stamp them.

[0003] When the existing press for processing metal sheets stamps metal sheets, generally, the workpiece is placed at the stamping position, and then the press is started to drive the stamping head to stamp the workpiece. When the pressure exceeds the yield strength of the workpiece but is lower than the tensile strength, the sheet metal undergoes plastic deformation and forms along the shape of the mold cavity. However, during this process, since the internal stress of the workpiece material itself undergoes plastic deformation after exceeding the yield strength, but there is still elastic deformation that has not been completely transformed at this time. After the pressure is unloaded, the elastic deformation part will immediately recover, resulting in the shape of the workpiece deviating from the designed size of the mold and forming springback. For this reason, we have designed a press for processing metal sheets to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a press for processing metal sheets to solve the problem that after the workpiece undergoes plastic deformation, there is still elastic deformation that has not been completely transformed, and after the pressure is unloaded, the elastic deformation part will immediately recover, forming springback of the workpiece.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A press for processing metal sheets, comprising: a machine body, two first connecting plates are fixedly connected to the top of the machine body, a first mold, a second mold, and a third mold are fixedly connected between the two first connecting plates in sequence from bottom to top. A first stamping groove is opened inside the first mold, a second stamping groove is opened inside the second mold, and a third stamping groove is opened inside the third mold. And the inclination angles of the inner inclined surfaces of the first stamping groove, the second stamping groove, and the third stamping groove decrease in sequence. A stamping mechanism, an opening mechanism, a supporting mechanism, and a blowing mechanism are respectively arranged at the top of the first mold.

[0006] As a further solution of the present invention: The stamping mechanism includes a first fixed seat fixedly connected to the bottom of the machine body. A hydraulic cylinder is installed on the top of the first fixed seat. The hydraulic cylinder penetrates to the bottom of the first fixed seat and is fixedly connected to a connecting rod. The bottom of the connecting rod is fixedly connected to a stamping head.

[0007] As a further solution of the present invention: The opening mechanism includes two groups of second fixed seats fixedly connected to the inner side of the machine body. Each group of the second fixed seats has two. One group of fixing plates is fixedly connected to both sides of the second mold and the third mold. Each group of the fixing plates has two. A limiting rod is fixedly connected between the second fixed seat and the fixing plate. A sliding block is slidably connected to the outer wall of the limiting rod. A sliding plate is fixedly connected to the bottom of the sliding block.

[0008] As a further solution of the present invention: The opening mechanism further includes a driving motor installed inside the second fixed seat. The driving motor penetrates to one side of the second fixed seat and is fixedly connected with a unidirectional threaded screw rod. And the unidirectional threaded screw rod is rotatably connected to the inside of the fixing plate. The sliding block is threadedly connected to the outer wall of the unidirectional threaded screw rod.

[0009] As a further solution of the present invention: The supporting mechanism includes an installation groove opened inside the sliding plate. Two first connecting seats are fixedly connected to the inside of the installation groove. A rotating rod is rotatably connected to the inside of each of the two first connecting seats. And the rotating rod penetrates to one side of the first connecting seat and is fixedly connected with a second connecting seat. A torsion spring is installed between the first connecting seat and the second connecting seat. A supporting plate is fixedly connected to the bottom of the rotating rod.

[0010] As a further solution of the present invention: The air blowing mechanism includes a ventilation round groove opened inside the sliding plate. A first air blowing pump is installed at the air inlet of the ventilation round groove. A first connecting pipe is installed at the input end of the first air blowing pump. A first connecting groove is opened inside the supporting plate. A hose is installed at the air outlet of the ventilation round groove. And the bottom of the hose is fixedly connected to the air inlet of the first connecting groove. A plurality of first ventilation holes are opened on one side of the supporting plate. And the first ventilation holes communicate with the first connecting groove. A switching air blowing assembly is arranged at the bottom of the sliding plate.

[0011] As a further solution of the present invention: The switching air blowing assembly includes a plurality of third ventilation holes opened at the bottom of the supporting plate. And the third ventilation holes communicate with the first connecting groove. A switching plate is slidably connected to the inside of the first connecting groove. And the switching plate fits inside the first connecting groove. The switching plate is provided with a plurality of second ventilation holes with diameters matching those of the first ventilation holes.

[0012] As a further solution of the present invention: the blowing assembly also includes a first connecting strip fixedly connected to the top of the switching plate, and the first connecting strip passes through the top of the support plate and is fixedly connected to a second connecting strip, the top of the second connecting strip is fixedly connected to a third connecting strip, the inner side of the third connecting strip is rotatably connected to a rotating wheel, one side of the first connecting seat is fixedly connected to a driving block, one side of the driving block is provided with a slope, and the rotating wheel is attached to the slope, and a reset spring is installed between the second connecting strip and the support plate.

[0013] As a further solution of the present invention: the blowing mechanism also includes two second connecting plates fixedly connected to one side of the first connecting plate, each of the second connecting plates is provided with an air permeable groove on the inner side, the inner side of the air permeable groove is provided with a plurality of fourth air permeable holes that penetrate to the outside of the second connecting plate, the inner side of the second connecting plate is provided with a second connecting groove, and the second connecting groove is communicated with the air permeable groove, a second blowing pump is installed at the air inlet of the second connecting groove, and a second connecting pipe is installed at the input end of the second blowing pump.

[0014] The present invention also discloses a metal sheet processing press machine, which uses the metal sheet processing press machine, and comprises the following steps:

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting a stamping mechanism and an opening mechanism, the stamping head moves downward, and after a period of stamping on the metal sheet, it stays for a period of time before the next stamping is performed, so that the stress inside the metal sheet has time to be redistributed, thereby reducing stress concentration. At the same time, when stamping in stages, since the deformation amount in each stage is relatively small and there is a pause time, the metal sheet can gradually adapt to the deformation in each stage, thereby reducing the rebound amount of the metal sheet, so that the workpiece will not rebound too much after stamping, thereby improving the accuracy of the workpiece after stamping, and then improving the overall practicality of the device;

[0017] 2. By setting a support mechanism, the support plate is pushed to rotate, so that the support plate rotates to a horizontal position, so that the end of the sliding plate is retracted to the inner side of the cavity between the second mold and the third mold (or the first mold and the second mold), so as not to affect the next stamping, thereby realizing a closed-loop function of stable support during stamping and automatic giving way after stamping, thereby ensuring the accuracy of mold structure adjustment during multi-stage stamping, thereby improving the overall practicality of the device;

[0018] 3. By setting up a blowing mechanism, hot air is discharged to the inside of the second stamping groove or the first stamping groove for preheating, so that when the metal sheet contacts the preheated die, the local temperature rises, resulting in a decrease in the yield strength of the material and an increase in ductility, reducing the work hardening phenomenon during cold stamping. At the same time, since the elastic modulus of the material decreases with the increase in temperature, the springback amount of the metal sheet is reduced, thereby improving the stamping accuracy of the metal sheet and enhancing the overall practicality of the device.

[0019] 4. By setting up parts such as a switching plate, the rotating wheel is pushed to move towards the support plate, so that the switching plate moves towards the third vent hole, causing the first vent hole and the second vent hole to be misaligned. And when the sliding plate moves to the end of the third vent hole and just retracts into the cavity between the second die and the third die, at this time, since the first vent hole is closed, the gas can only be ejected from the third vent hole, so that the bent part of the metal sheet can be heated, reducing the material strength and hardness at the bent part of the metal sheet, improving its plasticity and toughness. At the same time, by heating, the decrease in the elastic modulus of the material is reduced, further reducing the springback of the metal sheet, thereby improving the overall practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a cross-sectional view of the present invention;

[0022] Figure 3 is a schematic structural diagram of the opening mechanism of the present invention;

[0023] Figure 4 is a cross-sectional view of the opening mechanism of the present invention;

[0024] Figure 5 is an exploded view of parts such as the first die, the second die, and the third die of the present invention;

[0025] Figure 6 is a schematic structural diagram of the sliding plate of the present invention;

[0026] Figure 7 is a schematic structural diagram of the support mechanism of the present invention;

[0027] Figure 8 is a schematic structural diagram of the support plate of the present invention;

[0028] Figure 9 of the present invention Figure 8 is an enlarged view of part A;

[0029] Figure 10 is an exploded view of the support plate and the switching plate of the present invention;

[0030] Figure 11 This is a schematic diagram of the second connecting plate structure of the present invention.

[0031] In the figure: 1, the body; 2, the first fixing seat; 3, the hydraulic cylinder; 4, the connecting rod; 5, the stamping head; 6, the first connecting plate; 7, the first mold; 8, the second mold; 9, the third mold; 10, the second fixing seat; 11, the fixing plate; 12, the limiting rod; 13, the sliding block; 14, the sliding plate; 15, the driving motor; 16, the single-threaded screw rod; 17, the metal sheet; 18, the ventilation round groove; 19, the first air blowing pump; 20, the first connecting pipe; 21, the hose; 22, the support plate; 23, the first connecting groove; 24, the switching plate; 25, the first connecting seat; 26, the rotating rod; 27, the second connecting seat; 28, the torsion spring; 29, the first ventilation hole; 30, the second ventilation hole; 31, the first connecting strip; 32, the second connecting strip; 33, the third connecting strip; 34, the rotating wheel; 35, the driving block; 36, the slope; 37, the return spring; 38, the first stamping groove; 39, the second stamping groove; 40, the third stamping groove; 41, the installation groove; 42, the third ventilation hole; 43, the ventilation groove; 44, the second connecting groove; 45, the second connecting plate; 46, the fourth ventilation hole; 47, the second air blowing pump; 48, the second connecting pipe. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The embodiments of the present invention will be described below according to its overall structure.

[0034] Please refer to Figures 1 to 11 , this embodiment provides a press for processing metal sheets; including: a machine body 1, two first connecting plates 6 are fixedly connected to the top of the machine body 1, and a first mold 7, a second mold 8, and a third mold 9 are fixedly connected in sequence from bottom to top between the two first connecting plates 6. A first punching groove 38 is opened inside the first mold 7, a second punching groove 39 is opened inside the second mold 8, and a third punching groove 40 is opened inside the third mold 9. The inclination angles of the inner inclined surfaces of the first punching groove 38, the second punching groove 39, and the third punching groove 40 decrease in sequence. A punching mechanism, an opening mechanism, a supporting mechanism, and a blowing mechanism are respectively arranged at the top of the first mold 7; the punching mechanism includes a first fixed seat 2 fixedly connected to the bottom of the machine body 1, a hydraulic cylinder 3 is installed on the top of the first fixed seat 2, the hydraulic cylinder 3 penetrates to the bottom of the first fixed seat 2 and is fixedly connected with a connecting rod 4, and a punching head 5 is fixedly connected to the bottom of the connecting rod 4; the opening mechanism includes two groups of second fixed seats 10 fixedly connected to the inside of the machine body 1, each group of second fixed seats 10 has two, a group of fixing plates 11 are respectively fixedly connected to both sides of the second mold 8 and the third mold 9, each group of fixing plates 11 has two, a limiting rod 12 is fixedly connected between the second fixed seat 10 and the fixing plate 11, a sliding block 13 is slidably connected to the outer wall of the limiting rod 12, and a sliding plate 14 is fixedly connected to the bottom of the sliding block 13; the opening mechanism further includes a driving motor 15 installed inside the second fixed seat 10, the driving motor 15 penetrates to one side of the second fixed seat 10 and is fixedly connected with a one-way threaded lead screw 16, and the one-way threaded lead screw 16 is rotatably connected to the inside of the fixing plate 11, and the sliding block 13 is threadedly connected to the outer wall of the one-way threaded lead screw 16;

[0035] The hydraulic cylinder 3 is controlled by a PLC controller, which can control the intermittent start of the hydraulic cylinder 3. The hydraulic cylinder 3 is provided with three strokes, which can drive the stamping head 5 to move to the top of the first sliding plate 14, the top of the second sliding plate 14, and the bottom of the first stamping groove 38 respectively, so as to stamp the workpiece in three stages.

[0036] The driving motor 15 is controlled by a PLC controller, which can control the intermittent start of the driving motor 15. First, when the staff places the metal sheet at the detection position, the PLC controller controls the start of the hydraulic cylinder 3 at this time. The output end of the hydraulic cylinder 3 drives the connecting rod 4 to move downward, thereby driving the stamping head 5 to move downward. When the bottom of the stamping head 5 contacts the metal sheet 17, the metal sheet 17 is stamped in the first stage under the action of the stamping head 5 until the stamping head 5 moves to the top of the first sliding plate 14. At this time, the first stage is completed, the hydraulic cylinder 3 is closed, and the stamping head 5 stops moving. At this time, the PLC controller controls the start of the first group of driving motors 15, thereby driving the two sliding plates 14 of the first group to move to both sides of the third mold 9 respectively. When the two sliding plates 14 move to the end of the third ventilation hole 42 and just retract to the inner cavity between the second mold 8 and the third mold 9, after a period of time (this time can be 2 - 5 minutes), the PLC controller controls the start of the hydraulic cylinder 3, thereby driving the stamping head 5 to move downward, so as to stamp the metal sheet 17 in the second stage until the stamping head 5 moves to the top of the second sliding plate 14. At this time, the hydraulic cylinder 3 is closed, and the stamping head 5 stops moving. At this time, the PLC controller controls the start of the second group of driving motors 15, thereby driving the two sliding plates 14 of the second group to move to both sides of the third mold 9. When the two sliding plates 14 of the second group move to the end of the third ventilation hole 42 and just retract to the inner cavity between the first mold 7 and the second mold 8, after a period of time (this time is the same as the above time), the PLC controller controls the start of the hydraulic cylinder 3. The output end of the hydraulic cylinder 3 drives the connecting rod 4 to move downward, thereby driving the stamping head 5 to move downward. At this time, the metal sheet 17 is stamped in the third stage under the action of the stamping head 5 until the stamping head 5 moves to the bottom of the first stamping groove 38. At this time, the third stage is completed, so as to perform discontinuous stamping on the metal sheet 17 in three stages, so that there will be a short pause after each stage of stamping is completed. This allows the stress inside the metal sheet to have time to redistribute, thereby reducing stress concentration. At the same time, when stamping in stages, since the deformation amount in each stage is relatively small and there is a pause time, the metal sheet 17 can gradually adapt to the deformation in each stage, thereby reducing the springback amount of the metal sheet 17, and thus improving the overall practicality of the device.

[0037] Please refer to Figures 5 to 11, this embodiment provides a press for metal sheet processing; the support mechanism includes an installation groove 41 opened inside the sliding plate 14, two first connection seats 25 are fixedly connected to the inside of the installation groove 41, a rotating rod 26 is rotatably connected to the inside of each of the two first connection seats 25, and the rotating rod 26 penetrates to one side of the first connection seat 25 and is fixedly connected to a second connection seat 27. A torsion spring 28 is installed between the first connection seat 25 and the second connection seat 27. A support plate 22 is fixedly connected to the bottom of the rotating rod 26; the air blowing mechanism includes a breathable circular groove 18 opened inside the sliding plate 14, a first air blowing pump 19 is installed at the air inlet of the breathable circular groove 18, a first connection pipe 20 is installed at the input end of the first air blowing pump 19, a first connection groove 23 is opened inside the support plate 22, a hose 21 is installed at the air outlet of the breathable circular groove 18, and the bottom of the hose 21 is fixedly connected to the air inlet of the first connection groove 23. A plurality of first breathable holes 29 are opened on one side of the support plate 22, and the first breathable holes 29 communicate with the first connection groove 23. A switching air blowing assembly is arranged at the bottom of the sliding plate 14; the switching air blowing assembly includes a plurality of third breathable holes 42 opened at the bottom of the support plate 22, and the third breathable holes 42 communicate with the first connection groove 23. A switching plate 24 is slidably connected to the inside of the first connection groove 23, and the switching plate 24 fits inside the first connection groove 23. The switching plate 24 is provided with a plurality of second breathable holes 30 with diameters matching those of the first breathable holes 29; the air blowing assembly further includes a first connection strip 31 fixedly connected to the top of the switching plate 24, and the first connection strip 31 penetrates to the top of the support plate 22 and is fixedly connected to a second connection strip 32. A third connection strip 33 is fixedly connected to the top of the second connection strip 32. A rotating wheel 34 is rotatably connected to the inside of the third connection strip 33. A driving block 35 is fixedly connected to one side of the first connection seat 25. A slope 36 is opened on one side of the driving block 35, and the rotating wheel 34 fits on the slope 36. A return spring 37 is installed between the second connection strip 32 and the support plate 22; the air blowing mechanism further includes two second connection plates 45 fixedly connected to one side of the first connection plate 6. A breathable groove 43 is opened inside each of the two second connection plates 45. A plurality of fourth breathable holes 46 penetrating to the outside of the second connection plate 45 are opened inside the breathable groove 43. A second connection groove 44 is opened inside the second connection plate 45, and the second connection groove 44 communicates with the breathable groove 43. A second air blowing pump 47 is installed at the air inlet of the second connection groove 44, and a second connection pipe 48 is installed at the input end of the second air blowing pump 47;

[0038] When the stamping head 5 performs the first stage (or the second stage of stamping) on the sliding plate 14, at this time, under the action of the support plate 22, the sliding plate 14 is supported to prevent the sliding plate 14 from bending, tilting or displacing under the stamping load, thereby improving the stability of the device. At the same time, when the stamping is completed and when the sliding plate 14 moves towards the side of the third mold 9, at this time, under the action of the conical surface inside the second stamping groove 39 (or the inner end surface of the first stamping groove 38), the support plate 22 is pushed to rotate, so that the support plate 22 rotates to the horizontal position, thereby retracting the end of the sliding plate 14 into the cavity between the second mold 8 and the third mold 9 (or the first mold 7 and the second mold 8), so as not to affect the next stamping, thus realizing the closed-loop function of stable support during stamping and automatic yielding after stamping, thereby ensuring the accuracy of the die structure adjustment during the multi-stage stamping process, and thus improving the overall practicality of the device;

[0039] The first connecting pipe 20 is connected to the external heat supply pipe, which can provide hot air inside the first connecting pipe 20. The first air blowing pump 19 is controlled by the PLC controller, and the first air blowing pump 19 can be controlled to start intermittently. When the stamping head 5 performs the first stage or the second stage of stamping on the sliding plate 14, at this time, the PLC controller controls the first air blowing pump 19 to start, so as to supply air to the inside of the first connecting groove 23 through the second connecting groove 44, and then discharge the hot air to the inside of the second stamping groove 39 or the first stamping groove 38 through the first ventilation holes 29 for preheating, so that when the metal sheet 17 contacts the preheated die, the local temperature rises, resulting in a decrease in the yield strength of the material and an increase in ductility, reducing the work hardening phenomenon during cold stamping. At the same time, since the elastic modulus of the material decreases with the increase of temperature, the springback amount of the metal sheet 17 is reduced, thereby improving the stamping accuracy of the metal sheet 17, and thus improving the overall practicality of the device;

[0040] At this time, under the action of the conical surface inside the second stamping groove 39 (or the end face inside the first stamping groove 38), when the support plate 22 is pushed to rotate, the first connecting bar 31 is driven to rotate, thereby driving the rotating wheel 34 to rotate. Thus, under the action of the slope 36, the rotating wheel 34 is pushed to move towards the support plate 22, so that the switching plate 24 moves towards the third ventilation hole 42, causing the first ventilation hole 29 and the second ventilation hole 30 to be misaligned. And when the sliding plate 14 moves to the end of the third ventilation hole 42 and just retracts into the cavity between the second mold 8 and the third mold 9, at this time, since the first ventilation hole 29 is closed, the gas can only be ejected from the third ventilation hole 42, thereby heating the bent part of the metal sheet 17, reducing the material strength and hardness of the bent part of the metal sheet 17, improving its plasticity and toughness. At the same time, heating reduces the decrease in the elastic modulus of the material, further reducing the springback of the metal sheet 17, thus improving the overall practicality of the device;

[0041] The second connecting pipe 48 is connected to an external heat supply pipe, which can provide hot air inside the second connecting pipe 48. The second air blowing pump 47 is controlled by a PCL controller, which can control the second air blowing pump 47 to start intermittently. When the gas is ejected from the third ventilation hole 42 to heat the bent part of the metal sheet 17, at this time, the PCL controller controls the second air blowing pump 47 to start, and hot air is injected into the inside of the ventilation groove 43 through the second connecting groove 44, and then ejected from the side of the fourth ventilation hole 46, thereby spraying hot air on the bent parts of the other two sides of the metal sheet 17, further improving the heating effect on the metal sheet 17, thus improving the suppression effect on the springback of the metal sheet 17, and improving the overall practicality of the device.

[0042] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A press for processing metal sheets, characterized in that, Including: A machine body (1), two first connecting plates (6) are fixedly connected to the top of the machine body (1). A first mold (7), a second mold (8), and a third mold (9) are fixedly connected in sequence from bottom to top between the two first connecting plates (6). A first stamping groove (38) is formed inside the first mold (7), a second stamping groove (39) is formed inside the second mold (8), and a third stamping groove (40) is formed inside the third mold (9). And the inclination angles of the inner inclined surfaces of the first stamping groove (38), the second stamping groove (39), and the third stamping groove (40) decrease in sequence. A stamping mechanism, an opening mechanism, a supporting mechanism, and a blowing mechanism are respectively arranged at the top of the first mold (7); The stamping mechanism includes a first fixed seat (2) fixedly connected to the bottom of the machine body (1). A hydraulic cylinder (3) is installed on the top of the first fixed seat (2). The hydraulic cylinder (3) penetrates to the bottom of the first fixed seat (2) and is fixedly connected with a connecting rod (4). A stamping head (5) is fixedly connected to the bottom of the connecting rod (4); The opening mechanism includes two groups of second fixed seats (10) fixedly connected to the inside of the machine body (1). Each group of the second fixed seats (10) has two. A group of fixing plates (11) are respectively fixedly connected to both sides of the second mold (8) and the third mold (9). Each group of the fixing plates (11) has two. A limiting rod (12) is fixedly connected between the second fixed seat (10) and the fixing plate (11). A sliding block (13) is slidably connected to the outer wall of the limiting rod (12). A sliding plate (14) is fixedly connected to the bottom of the sliding block (13); The opening mechanism further includes a driving motor (15) installed inside the second fixed seat (10). The driving motor (15) penetrates to one side of the second fixed seat (10) and is fixedly connected with a one-way threaded lead screw (16). And the one-way threaded lead screw (16) is rotatably connected to the inside of the fixing plate (11). The sliding block (13) is threadedly connected to the outer wall of the one-way threaded lead screw (16); The supporting mechanism includes an installation groove (41) formed inside the sliding plate (14). Two first connection seats (25) are fixedly connected to the inside of the installation groove (41). A rotating rod (26) is rotatably connected to the inside of each of the two first connection seats (25). And the rotating rod (26) penetrates to one side of the first connection seat (25) and is fixedly connected with a second connection seat (27). A torsion spring (28) is installed between the first connection seat (25) and the second connection seat (27). A support plate (22) is fixedly connected to the bottom of the rotating rod (26); The air blowing mechanism includes a breathable circular groove (18) opened inside the sliding plate (14). At the air inlet of the breathable circular groove (18), a first air blowing pump (19) is installed. At the input end of the first air blowing pump (19), a first connecting pipe (20) is installed. A first connecting groove (23) is opened inside the support plate (22). At the air outlet of the breathable circular groove (18), a hose (21) is installed, and the bottom of the hose (21) is fixedly connected to the air inlet of the first connecting groove (23). A plurality of first breathable holes (29) are opened on one side of the support plate (22), and the first breathable holes (29) communicate with the first connecting groove (23). A switching air blowing assembly is arranged at the bottom of the sliding plate (14).

2. The press for processing metal sheets according to claim 1, characterized in that, The switching air blowing assembly includes a plurality of third breathable holes (42) opened at the bottom of the support plate (22), and the third breathable holes (42) communicate with the first connecting groove (23). A switching plate (24) is slidably connected inside the first connecting groove (23), and the switching plate (24) fits inside the first connecting groove (23). The switching plate (24) is provided with a plurality of second breathable holes (30) whose diameters match those of the first breathable holes (29).

3. The press for processing metal sheets according to claim 2, characterized in that, The air blowing assembly further includes a first connecting strip (31) fixedly connected to the top of the switching plate (24), and the first connecting strip (31) penetrates through the top of the support plate (22) and is fixedly connected to a second connecting strip (32). A third connecting strip (33) is fixedly connected to the top of the second connecting strip (32). A rotating wheel (34) is rotatably connected inside the third connecting strip (33). A driving block (35) is fixedly connected to one side of the first connecting seat (25). A slope (36) is opened on one side of the driving block (35), and the rotating wheel (34) fits on the slope (36). A return spring (37) is installed between the second connecting strip (32) and the support plate (22).

4. A press for processing metal sheets according to claim 3, characterized in that, The air blowing mechanism further includes two second connecting plates (45) fixedly connected to one side of the first connecting plate (6). A breathable groove (43) is opened inside each of the second connecting plates (45). A plurality of fourth breathable holes (46) penetrating through the outside of the second connecting plate (45) are opened inside the breathable groove (43). A second connecting groove (44) is opened inside the second connecting plate (45), and the second connecting groove (44) communicates with the breathable groove (43). A second air blowing pump (47) is installed at the air inlet of the second connecting groove (44). At the input end of the second air blowing pump (47), a second connecting pipe (48) is installed.

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