Punch forming die

Abstract

The invention relates to the technical field of plate stamping, in particular to a stamping forming die which comprises a platen, a plurality of square columns are fixedly mounted on the platen, a top plate is jointly and fixedly mounted on the upper sides of the square columns, a press is fixedly mounted on the upper portion of the top plate, and a movable die is arranged on the lower portion of the top plate in an up-down sliding mode and connected with the press. A square column is fixedly mounted on the upper portion of a platen, a fixed die is fixedly mounted on the upper portion of the platen, the square column is arranged in a rectangular shape, an anti-bending mechanism for preventing a plate from being bent is arranged on the platen, and a back pressing mechanism for flattening a stamped workpiece is jointly arranged on the square column and the platen. By moving the [-shaped plate back and forth, the abutting roller pushes the plate to move back and forth, so that the plate is prevented from being adhered to the movable die, the plate is prevented from being pulled up, the problem that the plate is bent is avoided, and the product quality after the plate is stamped is further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal stamping, and specifically to a stamping die. Background Art

[0002] Multi-stage stamping of metal sheets is a metal processing technology carried out with the aid of a stamping die. It is a process of gradually forming a sheet into a desired shape through multiple consecutive stamping operations. Each stamping operation is called a "stage", and the combination of these stages can complete the processing of complex shapes.

[0003] The existing multi-stage stamping die for sheets mainly consists of a press, an operating table, a die and a feeding mechanism. The fixed die in the die is fixedly installed on the operating table, the moving die in the die is fixedly installed on the press, and the feeding mechanism continuously feeds the metal sheet to the upper side of the fixed die. Subsequently, the press drives the moving die and the fixed die to close the die, so that the sheet is gradually stamped into the shape of the die.

[0004] However, when the existing multi-stage stamping die for sheets stamps the sheet, if the force exerted by the moving die on the sheet is large, the sheet will adhere to the moving die to a certain extent, causing the moving die to pull up the sheet from the fixed die when the moving die rises. Subsequently, the moving die pushes the sheet to separate from the moving die through the ejector pins on it. However, due to the limitation of the feeding mechanism on the feeding side of the sheet, the pulled-up sheet is bent, which affects the stamping effect. In addition, during continuous stamping, the side of the sheet facing the moving die is continuously stressed, causing the sheet to bend and warp, thus affecting the quality of the final product. Summary of the Invention

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a stamping die, including a table board, on which several square columns are fixedly installed. The upper sides of the square columns are jointly fixedly installed with a top board. A press is fixedly installed on the upper part of the top board. A moving die is slidably arranged up and down below the top board. The moving die is connected to the press. A fixed die is fixedly installed on the upper part of the table board. The square columns are arranged in a rectangle. An anti-bending mechanism for preventing the sheet from being bent is arranged on the table board. An anti-pressure mechanism for flattening the stamped workpiece is jointly arranged on the square columns and the table board.

[0006] The anti-bending mechanism includes a U-shaped plate slidably arranged back and forth on the table board. Two clamping plates arranged up and down are slidably arranged inside the longitudinal section of the U-shaped plate. Two abutting rollers are connected to the longitudinal section of the U-shaped plate through an adjusting component. Through slots penetrating up and down are opened on both the left and right sides of the table board. A supporting plate is slidably arranged back and forth inside the through slot on the left side of the table board. The supporting plate is fixedly connected to the lower part of the longitudinal section of the U-shaped plate. A feeding component is jointly arranged on the supporting plate and the table board.

[0007] The backpressure mechanism includes an upper cross plate slidably arranged up and down between two square columns on the right side. A first mold is fixedly installed at the lower part of the upper cross plate. A lower cross plate is slidably arranged up and down between two square columns on the right side. A second mold is fixedly installed at the upper part of the lower cross plate. The first mold has the same shape as the rightmost first stage of the moving mold, and the second mold has the same shape as the rightmost first stage of the fixed mold. The backpressure mechanism further includes a power assembly for driving the upper cross plate and the lower cross plate.

[0008] Preferably, the adjusting assembly includes two groups of ear plates symmetrically arranged in the front and back direction. Each group of ear plates consists of two ear plates symmetrically arranged up and down. The ear plates are slidably connected to the longitudinal section of the C-shaped plate in the front and back direction. The ear plates within the same group are jointly rotatably connected to the abutting roller. A bidirectional screw is rotatably arranged on the upper side of the longitudinal section of the C-shaped plate, and the bidirectional screw is threadedly connected to the two upper ear plates.

[0009] Preferably, a position block is slidably arranged up and down on the left side of the front part of the C-shaped plate. The position block is locked in position with the C-shaped plate by a fastening screw. Two connecting plates arranged up and down are slidably arranged up and down on the left part of the front side of the C-shaped plate. A follower rod inserted into the front side of the C-shaped plate is fixedly installed on the front side of the clamping plate. The left side of the connecting plate is fixedly connected to the corresponding follower rod. Electric push rods are fixedly installed on both the upper and lower sides of the position block, and the telescopic sections of the electric push rods are fixedly connected to the connecting plates at the corresponding positions.

[0010] Preferably, a fixed support plate is fixedly installed on the upper part of the front side of the platen. A first hydraulic rod is fixedly installed on the rear side of the fixed support plate, and the telescopic section of the first hydraulic rod is fixedly connected to the front side of the C-shaped plate.

[0011] Preferably, the feeding assembly includes two rectangular frames arranged left and right on the upper part of the supporting plate. The left rectangular frame is fixedly connected to the supporting plate, and the right rectangular frame is slidably connected to the supporting plate in the left and right direction. Two groups of sliding blocks are symmetrically arranged up and down inside the rectangular frame. Each group of sliding blocks consists of two sliding blocks symmetrically arranged in the front and back direction. The sliding blocks are slidably connected to the rectangular frame in the up and down direction. A pressure roller is rotatably arranged between the two sliding blocks in the same group.

[0012] Preferably, a unidirectional threaded rod is rotatably arranged on the side where the two sliding blocks on the front side of the right rectangular frame are away from each other. The unidirectional threaded rod is threadedly connected to the right rectangular frame. A linkage plate is fixedly installed on the side of the sliding block on the right rectangular frame away from the middle of the right rectangular frame. The linkage plate is slidably connected to the sliding block on the left rectangular frame in the left and right direction.

[0013] Preferably, a ratchet is fixedly sleeved on the outer side of the front part of the pressure roller on the right rectangular frame. Pawls are hinged at equal intervals in the circumferential direction of the corresponding pressure roller inside the sliding block on the front side of the right rectangular frame. A torsion spring is arranged between the pawl and the sliding block.

[0014] Preferably, a moving plate is fixedly installed on the left side of the lower part of the supporting plate. The moving plate is slidably connected to the left side of the table plate in the front-back direction. A second hydraulic rod is fixedly installed on the moving plate. A pushing support plate inserted into the lower part of the supporting plate is fixedly installed on the lower part of the right rectangular frame. The telescopic section of the second hydraulic rod is fixedly connected to the pushing support plate.

[0015] Preferably, the power assembly includes an upper fixing plate fixedly installed between the two right square columns. The upper fixing plate is located above the upper cross plate. A third hydraulic rod is fixedly installed on the upper fixing plate. The telescopic section of the third hydraulic rod is fixedly connected to the upper cross plate. A lower fixing plate is fixedly installed between the two right square columns. The lower fixing plate is located below the lower cross plate. A fourth hydraulic rod is fixedly installed on the lower fixing plate. The telescopic section of the fourth hydraulic rod is fixedly connected to the lower cross plate.

[0016] Preferably, a blocking plate is slidably arranged on the right front square column in the up-down direction. The rear side of the blocking plate is located below the upper cross plate. An adjusting screw rod is rotatably arranged inside the right front square column. The adjusting screw rod is threadedly connected to the blocking plate.

[0017] The beneficial effects of the present invention are as follows:

[0018] First, the feeding assembly adopted by the present invention can roll the plate while feeding the plate, so that the plate can move smoothly between the moving die and the fixed die, thus avoiding the influence of the uneven plate on the stamping process and ensuring the product quality of the plate after stamping.

[0019] Second, the C-shaped plate adopted by the present invention drives the two abutting rollers to abut and limit the front and rear sides of the plate. When the moving die starts to move upward, by moving the C-shaped plate back and forth, the abutting rollers push the plate back and forth, thereby preventing the plate from adhering to the moving die, further preventing the plate from being pulled up, and avoiding the problem of plate bending, and further ensuring the product quality of the plate after stamping.

[0020] Third, when the abutting rollers push the plate back and forth, the clamping plates can also clamp the upper and lower sides of the plate, thereby limiting the up and down position of the plate and preventing the abutting rollers from pushing the plate to bend, and further ensuring the flatness of the plate before stamping.

[0021] Fourth, the power assembly adopted by the present invention can drive the second die to stamp the plate on the first die from bottom to top, so that the plate is subjected to a reverse punching force at the end of stamping, thereby avoiding the phenomenon of bending and warping of the plate after multiple stampings and ensuring the stamping product quality of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a partial structural schematic diagram of the platen and the anti-bending mechanism of the present invention.

[0025] Figure 3 This is a partial cross-sectional view of the platen, the supporting plate and the feeding assembly of the present invention.

[0026] Figure 4 This is a cross-sectional view of the sliding block, the pressure roller, the ratchet and the pawl of the present invention.

[0027] Figure 5 This is a structural schematic diagram of the C-shaped plate and the supporting plate of the present invention.

[0028] Figure 6 This is a structural schematic diagram of the platen, the C-shaped plate, the fixed support plate and the first hydraulic rod of the present invention.

[0029] Figure 7 This is a right cross-sectional view of the square column and the anti-pressure mechanism of the present invention.

[0030] In the figure: 1, platen; 2, square column; 3, top plate; 4, press; 5, moving die; 6, fixed die; 7, anti-bending mechanism; 8, anti-pressure mechanism; 71, C-shaped plate; 72, clamping plate; 73, adjustment assembly; 74, abutting roller; 75, supporting plate; 76, feeding assembly; 81, upper cross plate; 82, first mold; 83, lower cross plate; 84, second mold; 85, power assembly; 711, fixed support plate; 712, first hydraulic rod; 721, position block; 722, connecting plate; 723, follower rod; 724, electric push rod; 731, ear plate; 732, bidirectional screw rod; 761, rectangular frame; 762, sliding block; 763, pressure roller; 764, unidirectional threaded rod; 765, linkage plate; 766, ratchet; 767, pawl; 768, moving plate; 769, second hydraulic rod; 851, upper fixing plate; 852, third hydraulic rod; 853, lower fixing plate; 854, fourth hydraulic rod; 855, blocking plate; 856, adjustment screw. Detailed Description of the Invention

[0031] The embodiments of the present invention will be described in detail below. The described embodiments are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention. For those not specified in the embodiments, the techniques or conditions described in the literature in the relevant field or according to the product instructions are followed.

[0032] Refer to Figure 1, A stamping die, comprising a platen 1, on which a number of square columns 2 are fixedly installed. Above the square columns 2, a top plate 3 is fixedly installed. Above the top plate 3, a press 4 is fixedly installed. Below the top plate 3, a moving die 5 is slidably arranged up and down. The moving die 5 is connected to the press 4. On the upper part of the platen 1, a fixed die 6 is fixedly installed. The square columns 2 are arranged in a rectangle. On the platen 1, an anti-bending mechanism 7 for preventing the sheet from bending is provided. On the square columns 2 and the platen 1, an anti-pressure mechanism 8 for flattening the workpiece after stamping is provided.

[0033] When it is necessary to stamp a metal sheet, the operator pulls the metal sheet into the interior of the anti-bending mechanism 7, so that the metal sheet moves through the anti-bending mechanism 7 to between the moving die 5 and the fixed die 6. Subsequently, the press 4 is started to drive the moving die 5 to continuously move up and down repeatedly, so that the moving die 5 continuously closes with the fixed die 6. And each time the moving die 5 moves upward, the anti-bending mechanism 7 can drive the sheet to move back and forth, prevent the sheet from being pulled up by the moving die 5, and at the same time drive the sheet to move to the right for feeding, so that the sheet is gradually stamped into shape.

[0034] When the sheet moves to the position of the anti-pressure mechanism 8, the anti-pressure mechanism 8 automatically stamps the sheet from bottom to top, and then performs a stamping with downward force on the sheet stamping that is continuously stressed on the upper side, so as to prevent the final stamping product from bending.

[0035] Refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 5 , The anti-bending mechanism 7 includes a C-shaped plate 71 slidably arranged back and forth on the platen 1. Inside the longitudinal section of the C-shaped plate 71, two clamping plates 72 arranged up and down are slidably arranged. On the longitudinal section of the C-shaped plate 71, two abutting rollers 74 are connected through an adjusting assembly 73. On both the left and right sides of the platen 1, through slots penetrating up and down are provided. Inside the slot on the left side of the platen 1, a supporting plate 75 is slidably arranged back and forth. The supporting plate 75 is fixedly connected to the lower part of the longitudinal section of the C-shaped plate 71.

[0036] Refer to Figure 1 and Figure 2 , The adjusting assembly 73 includes two groups of ear plates 731 symmetrically arranged back and forth. Each group of ear plates 731 consists of two ear plates 731 symmetrically arranged up and down. The ear plates 731 are slidably connected to the longitudinal section of the C-shaped plate 71 in the front-back direction. The ear plates 731 within the same group are jointly rotatably connected to the abutting roller 74. On the upper side of the longitudinal section of the C-shaped plate 71, a bidirectional screw 732 is rotatably arranged. The bidirectional screw 732 is threadedly connected to the two upper ear plates 731.

[0037] When it is necessary to stamp the sheet metal, the operator pulls the sheet metal between the two clamping plates 72. Subsequently, the operator manually rotates the bidirectional screw rod 732, causing the bidirectional screw rod 732 to drive the ear plates 731 connected thereto to move closer to each other synchronously, so that the ear plates 731 drive the abutting rollers 74 to move synchronously, thereby making the abutting rollers 74 abut against the front and rear sides of the sheet metal. Subsequently, the abutting rollers 74 limit the sheet metal at the middle position of the C-shaped plate 71.

[0038] Continue to refer to Figure 1 and Figure 2 As shown in, a position block 721 is slidably arranged up and down on the upper and lower sides of the left front part of the C-shaped plate 71. The position block 721 is locked in position with the C-shaped plate 71 by fastening screws. Two connecting plates 722 arranged up and down are slidably arranged on the left front part of the front side of the C-shaped plate 71. A follower rod 723 inserted into the front side of the C-shaped plate 71 is fixedly installed on the front side of the clamping plate 72. The left side of the connecting plate 722 is fixedly connected to the follower rod 723 at the corresponding position. Electric push rods 724 are fixedly installed on both the upper and lower sides of the position block 721. The telescopic sections of the electric push rods 724 are fixedly connected to the connecting plates 722 at the corresponding positions.

[0039] When the two abutting rollers 74 are respectively abutted against the front and rear sides of the sheet metal, the telescopic sections of the two electric push rods 724 are synchronously contracted, so that the electric push rods 724 drive the follower rods 723 to move closer to each other through the connecting plates 722. The follower rods 723 drive the two clamping plates 72 to move closer to each other synchronously, so that the clamping plates 72 respectively clamp the upper and lower sides of the sheet metal. At the same time, the sheet metal drives the position block 721 to move up and down to the position directly in front of the corresponding sheet metal through the reaction force on the clamping plates 72. Then, the operator fixes the position block 721 to the C-shaped plate 71 by rotating the fastening screws.

[0040] Through the reaction force of the sheet metal, the position block 721 can be quickly adjusted to the position directly in front of the sheet metal. When stamping sheets of different thicknesses, the position block 721 can also be quickly corresponded to the position directly in front of the sheet metal, so that the upper and lower clamping plates 72 can clamp the upper and lower sides of the sheets of different thicknesses synchronously and with the same force, thereby preventing the clamping plates 72 from pushing the sheet metal to change its position and avoiding the sheet metal from being bent.

[0041] Refer to Figure 1 、 Figure 2 and Figure 3, the anti-bending mechanism 7 further includes a feeding component 76 jointly arranged on the supporting plate 75 and the table plate 1. The feeding component 76 includes two rectangular frames 761 arranged left and right on the upper part of the supporting plate 75. The left rectangular frame 761 is fixedly connected to the supporting plate 75, and the right rectangular frame 761 is slidably connected to the supporting plate 75 in the left-right direction. Two groups of sliding blocks 762 are symmetrically arranged up and down inside the rectangular frame 761. Each group of sliding blocks 762 consists of two symmetrically arranged front and rear sliding blocks 762. The sliding blocks 762 are slidably connected to the rectangular frame 761 in the up-down direction. A pressure roller 763 is rotatably arranged between the two sliding blocks 762 in the same group.

[0042] Refer to Figure 2 and Figure 3 , a one-way threaded rod 764 is rotatably arranged on the mutually separated sides of the two sliding blocks 762 on the front side of the right rectangular frame 761. The one-way threaded rod 764 is threadedly connected to the right rectangular frame 761. A linkage plate 765 is fixedly installed on the side of the sliding block 762 on the right rectangular frame 761 away from the middle of the right rectangular frame 761. The linkage plate 765 is slidably connected left and right with the sliding block 762 on the left rectangular frame 761.

[0043] When the operator pulls the plate to between the two clamping plates 72, the plate moves through between the upper and lower pressure rollers 763 of the two rectangular frames 761 on both sides. Then the operator manually rotates the lower one-way threaded rod 764, so that the lower one-way threaded rod 764 drives the sliding block 762 at the lower front part of the right rectangular frame 761 to move upward. At the same time, the sliding block 762 at the lower front part of the right rectangular frame 761 drives the sliding block 762 at the lower front part of the left rectangular frame 761 to move upward synchronously through the linkage plate 765 at the lower front part. The sliding block 762 also drives the lower pressure roller 763 to move upward until it abuts against the lower side of the plate.

[0044] Similarly, the operator manually rotates the upper one-way threaded rod 764, so that the upper pressure roller 763 moves downward until it abuts against the upper side of the plate, thereby enabling the two pressure rollers 763 inside the same rectangular frame 761 to clamp the plate.

[0045] Refer to Figure 1 , Figure 3 , Figure 4 and Figure 6 , a fixed support plate 711 is fixedly installed on the upper front side of the table plate 1. A first hydraulic rod 712 is fixedly installed on the rear side of the fixed support plate 711. The telescopic section of the first hydraulic rod 712 is fixedly connected to the front side of the U-shaped plate 71. A ratchet 766 is fixedly sleeved on the outer side of the front part of the pressure roller 763 on the right rectangular frame 761. Pawls 767 are equally spaced and hinged along the circumferential direction of the corresponding pressure roller 763 inside the sliding block 762 on the front side of the right rectangular frame 761. A torsion spring is arranged between the pawl 767 and the sliding block 762.

[0046] Refer to Figure 2 、 Figure 3 and Figure 5 , a moving plate 768 is fixedly installed on the lower left side of the supporting plate 75. The moving plate 768 is slidably connected to the left side of the table plate 1 in the front-rear direction. A second hydraulic rod 769 is fixedly installed on the moving plate 768. A pushing support plate that penetrates to the lower part of the supporting plate 75 is fixedly installed on the lower part of the right rectangular frame 761. The telescopic section of the second hydraulic rod 769 is fixedly connected to the pushing support plate.

[0047] When the moving mold 5 and the fixed mold 6 are closed to stamp the plate, the telescopic section of the second hydraulic rod 769 is in the extended state. Then, the telescopic section of the second hydraulic rod 769 is contracted, so that the second hydraulic rod 769 drives the right rectangular frame 761 to move leftward through the pushing support plate. The two pressure rollers 763 on the right rectangular frame 761 are driven to move leftward synchronously. Since the plate is squeezed and limited by the moving mold 5 and the fixed mold 6, the position of the plate remains unchanged. Thus, the two pressure rollers 763 on the right rectangular frame 761 roll and flatten the plate while moving.

[0048] Subsequently, the press 4 drives the moving mold 5 to move upward. Then, the telescopic section of the first hydraulic rod 712 is extended, so that the telescopic section of the first hydraulic rod 712 pushes the C-shaped plate 71 to move backward. The C-shaped plate 71 drives the plate to move backward synchronously through the abutting roller 74, so that the plate and the moving mold 5 have relative front-back displacement, thereby preventing the moving mold 5 from adhering to the plate and pulling up the plate. At the same time, the clamping plates 72 are clamped on the upper and lower sides of the plate, so that the clamping plates 72 support the plate and prevent the abutting roller 74 from deforming the plate.

[0049] After the C-shaped plate 71 moves backward, the telescopic section of the first hydraulic rod 712 is contracted to drive the plate to move forward to the initial position through the C-shaped plate 71. Then, the telescopic sections of the two electric push rods 724 are extended simultaneously, so that the clamping plates 72 move away from each other, thus avoiding the clamping plates 72 from obstructing the feeding of the plate.

[0050] When the two clamping plates 72 do not clamp the plate, the telescopic section of the second hydraulic rod 769 is extended, so that the second hydraulic rod 769 drives the right rectangular frame 761 to move to the right. The right rectangular frame 761 drives the plate to move to the right through the two abutting rollers 74 on it, thereby realizing the automatic feeding of the plate.

[0051] It should be noted that when the right rectangular frame 761 drives the abutting roller 74 thereon to move leftward, the abutting roller 74 rotates due to the frictional force with the plate, and the abutting roller 74 synchronously drives the ratchet wheel 766 thereon to rotate. At this time, the rotating ratchet wheel 766 intermittently pushes the pawl 767, so that the pawl 767 cannot hinder the rotation of the ratchet wheel 766. When the right rectangular frame 761 drives the abutting roller 74 thereon to move rightward, the pawl 767 is snapped into the tooth groove of the ratchet wheel 766 under the action of the elastic force of the torsion spring, so that the ratchet wheel 766 cannot rotate, thereby making the abutting roller 74 unable to rotate, and further enabling the abutting roller 74 to drive the plate to move rightward synchronously through the frictional force with the plate.

[0052] Refer to Figure 1 and Figure 7 , the counterpressure mechanism 8 includes an upper cross plate 81 slidably arranged up and down between the two right square columns 2. A first mold 82 is fixedly installed at the lower part of the upper cross plate 81. A lower cross plate 83 is slidably arranged up and down between the two right square columns 2. A second mold 84 is fixedly installed at the upper part of the lower cross plate 83. The first mold 82 has the same shape as the rightmost stage of the moving mold 5, and the second mold 84 has the same shape as the rightmost stage of the fixed mold 6. The counterpressure mechanism 8 further includes a power assembly 85 for driving the upper cross plate 81 and the lower cross plate 83.

[0053] Refer to Figure 7 , the power assembly 85 includes an upper fixed plate 851 fixedly installed together between the two right square columns 2. The upper fixed plate 851 is located above the upper cross plate 81. A third hydraulic rod 852 is fixedly installed on the upper fixed plate 851. The telescopic section of the third hydraulic rod 852 is fixedly connected to the upper cross plate 81. A lower fixed plate 853 is fixedly installed together between the two right square columns 2. The lower fixed plate 853 is located below the lower cross plate 83. A fourth hydraulic rod 854 is fixedly installed on the lower fixed plate 853. The telescopic section of the fourth hydraulic rod 854 is fixedly connected to the lower cross plate 83.

[0054] Refer to Figure 1 and Figure 7 , a blocking plate 855 is slidably arranged up and down on the right front square column 2. The rear side of the blocking plate 855 is located below the upper cross plate 81. An adjusting screw 856 is rotatably arranged inside the right front square column 2. The adjusting screw 856 is threadedly connected to the blocking plate 855.

[0055] The operator rotates the adjusting screw rod 856 in advance according to the thickness of the sheet, so that the adjusting screw rod 856 drives the baffle plate 855 to move up and down. When the sheet moves between the first mold 82 and the second mold 84, while the moving mold 5 moves downward, the telescopic section of the third hydraulic rod 852 is extended, so that the third hydraulic rod 852 drives the upper cross plate 81 to move downward until it abuts against the upper side surface of the baffle plate 855, so that the upper cross plate 81 drives the first mold 82 to move downward and abut against the upper side surface of the sheet, but the first mold 82 does not apply pressure to the sheet.

[0056] When the moving mold 5 applies pressure to the sheet, the telescopic section of the fourth hydraulic rod 854 is synchronously extended, so that the fourth hydraulic rod 854 drives the second mold 84 to squeeze against the lower side surface of the sheet through the lower cross plate 83, so that the second mold 84 squeezes the sheet from bottom to top, and further enables the sheet to receive a reverse squeezing force to prevent the sheet stamping from bending.

[0057] Refer to Figures 1 - 7 , when the present invention punches the sheet, the following steps are further included: First step, the operator pulls the sheet to move through the upper and lower pressure rollers 763 of the rectangular frames 761 on both sides, so that the sheet moves between the two clamping plates 72, and then the operator manually rotates the bidirectional screw rod 732 to drive the abutting roller 74 to push and limit the sheet at the middle position of the C-shaped plate 71.

[0058] Second step, the telescopic sections of the two electric push rods 724 are synchronously contracted to drive the clamping plates 72 to clamp on the upper and lower side surfaces of the sheet respectively. At the same time, the sheet drives the position blocks 721 to move up and down to the front position corresponding to the sheet through the reaction force on the clamping plates 72, and then the operator fixes the position blocks 721 to the C-shaped plate 71 by rotating the fastening screws.

[0059] Third step, the operator manually rotates the one-way threaded rods 764 on the upper and lower sides, so that the pressure rollers 763 inside the two rectangular frames 761 all abut against the upper and lower side surfaces of the sheet.

[0060] Fourth step, the moving mold 5 and the fixed mold 6 are closed to punch the sheet, and then the telescopic section of the second hydraulic rod 769 is contracted, so that the right rectangular frame 761 moves to the left, and further enables the two pressure rollers 763 on the right rectangular frame 761 to roll and flatten the sheet while moving.

[0061] Fifth step, the press 4 drives the moving mold 5 to move upward, and the telescopic section of the first hydraulic rod 712 is extended to push the sheet to move backward synchronously through the abutting roller 74, so that the sheet and the moving mold 5 have relative front and back displacements, and further prevents the moving mold 5 from adhering to the sheet and pulling up the sheet. At the same time, the clamping plates 72 are clamped on the upper and lower sides of the sheet, so that the clamping plates 72 support the sheet to prevent the abutting roller 74 from deforming the sheet.

[0062] In the sixth step, the telescopic section of the first hydraulic rod 712 contracts to drive the plate forward to the initial position through the C-shaped plate 71. Subsequently, the telescopic sections of the two electric push rods 724 are simultaneously extended, causing the clamping plates 72 to move away from each other. The telescopic section of the second hydraulic rod 769 is extended to drive the plate to move to the right, thereby realizing automatic feeding of the plate.

[0063] In the seventh step, while the moving die 5 moves downward, the telescopic section of the third hydraulic rod 852 is extended, causing the third hydraulic rod 852 to drive the upper cross plate 81 to abut against the upper side of the plate. When the moving die 5 applies pressure to the plate, the telescopic section of the fourth hydraulic rod 854 is synchronously extended, causing the fourth hydraulic rod 854 to drive the second die 84 to press against the lower side of the plate through the lower cross plate 83. Thus, the second die 84 presses the plate from bottom to top, and further causes the plate to receive a reverse extrusion force to prevent the bending of the plate stamping.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and still be covered by the protection scope of the present invention.

Claims

1. A stamping die, comprising a table, a plurality of square columns are fixedly mounted on the table, a top plate is fixedly mounted on the upper side of the square columns, a press is fixedly mounted on the upper part of the top plate, a movable die is slidably mounted on the lower part of the top plate, the movable die is connected to the press, and a fixed die is fixedly mounted on the upper part of the table, characterized in that: The square columns are arranged in a rectangle. An anti-bending mechanism for preventing the sheet from bending is provided on the platen. An anti-pressure mechanism for flattening the workpiece after stamping is jointly provided on the square columns and the platen. The anti-bending mechanism includes a U-shaped plate slidably arranged on the platen in the front-back direction. Two clamping plates arranged up and down are slidably arranged inside the longitudinal section of the U-shaped plate. Two abutting rollers are connected to the longitudinal section of the U-shaped plate through an adjusting component. Through slots penetrating up and down are formed on both the left and right sides of the platen. A supporting plate is slidably arranged in the front-back direction inside the through slot on the left side of the platen. The supporting plate is fixedly connected to the lower part of the longitudinal section of the U-shaped plate. A feeding component is jointly provided on the supporting plate and the platen. The anti-pressure mechanism includes an upper cross plate slidably arranged between the two square columns on the right side. A first mold is fixedly installed at the lower part of the upper cross plate. A lower cross plate is slidably arranged between the two square columns on the right side in the up-down direction. A second mold is fixedly installed at the upper part of the lower cross plate. The first mold has the same shape as the rightmost first stage of the moving mold. The second mold has the same shape as the rightmost first stage of the fixed mold. The anti-pressure mechanism further includes a power component for driving the upper cross plate and the lower cross plate.

2. A stamping die according to claim 1, characterized in that: The adjusting component includes two groups of ear plates symmetrically arranged in the front-back direction. Each group of ear plates consists of two ear plates symmetrically arranged up and down. The ear plates are slidably connected to the longitudinal section of the U-shaped plate in the front-back direction. The ear plates in the same group are jointly rotatably connected to the abutting roller. A bidirectional screw rod is rotatably arranged on the upper side of the longitudinal section of the U-shaped plate. The bidirectional screw rod is threadedly connected to the two upper ear plates.

3. A stamping die according to claim 1, characterized in that: A position block is slidably arranged up and down at the left front part of the U-shaped plate. The position block is locked in position with the U-shaped plate through a fastening screw. Two connecting plates arranged up and down are slidably arranged at the left front part of the front side of the U-shaped plate. A follower rod inserted into the front side of the U-shaped plate is fixedly installed at the front side of the clamping plate. The left side of the connecting plate is fixedly connected to the corresponding follower rod. Electric push rods are fixedly installed on both the upper and lower sides of the position block. The telescopic section of the electric push rod is fixedly connected to the connecting plate at the corresponding position.

4. A stamping die according to claim 1, characterized in that: A fixed support plate is fixedly installed at the upper front part of the platen. A first hydraulic rod is fixedly installed at the rear side of the fixed support plate. The telescopic section of the first hydraulic rod is fixedly connected to the front side of the U-shaped plate.

5. A stamping die according to claim 1, characterized in that: The feeding component includes two rectangular frames arranged left and right on the upper part of the supporting plate. The left rectangular frame is fixedly connected to the supporting plate. The right rectangular frame is slidably connected to the supporting plate in the left-right direction. Two groups of sliding blocks are symmetrically arranged up and down inside the rectangular frame. Each group of sliding blocks consists of two sliding blocks symmetrically arranged in the front-back direction. The sliding blocks are slidably connected to the rectangular frame in the up-down direction. A pressing roller is jointly rotatably arranged between the two sliding blocks in the same group.

6. A stamping die according to claim 5, characterized in that: A unidirectional threaded rod is rotatably arranged on the side where the two sliding blocks on the front side of the right rectangular frame are away from each other. The unidirectional threaded rod is threadedly connected to the right rectangular frame. A linkage plate is fixedly installed on the side where the sliding block on the right rectangular frame is away from the middle of the right rectangular frame. The linkage plate is slidably connected to the sliding block on the left rectangular frame in the left-right direction.

7. A stamping die according to claim 5, characterized in that: A ratchet is fixedly sleeved on the outer side of the front part of the pressing roller on the right rectangular frame. Pawls are hinged at equal intervals along the circumference of the corresponding pressing roller inside the sliding block on the front side of the right rectangular frame. A torsion spring is arranged between the pawl and the sliding block.

8. A stamping die according to claim 5, characterized in that: A movable plate is fixedly installed on the left side of the lower part of the supporting plate, and the movable plate is slidably connected to the left side of the table plate along the front-rear direction. A No. 2 hydraulic rod is fixedly installed on the movable plate, and a pushing support plate inserted into the lower part of the supporting plate is fixedly installed on the lower part of the rectangular frame on the right side, and the telescopic section of the No. 2 hydraulic rod is fixedly connected to the pushing support plate.

9. A stamping die according to claim 1, characterized in that: The power assembly includes an upper fixed plate fixedly installed between the two square columns on the right side, the upper fixed plate is located on the upper side of the upper horizontal plate, a No. 3 hydraulic rod is fixedly installed on the upper fixed plate, and the telescopic section of the No. 3 hydraulic rod is fixedly connected to the upper horizontal plate; a lower fixed plate is fixedly installed between the two square columns on the right side, the lower fixed plate is located on the lower side of the lower horizontal plate, a No. 4 hydraulic rod is fixedly installed on the lower fixed plate, and the telescopic section of the No. 4 hydraulic rod is fixedly connected to the lower horizontal plate.

10. A stamping die according to claim 1, characterized in that: A blocking plate is slidably arranged on the square column on the front side of the right part in the up and down directions, and the rear side of the blocking plate is located at the lower side of the upper horizontal plate. An adjusting screw is rotatably arranged inside the square column on the front side of the right part, and the adjusting screw is threadedly connected with the blocking plate.

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