Stamping die forming structure with springback prevention function

Abstract

The invention discloses a stamping die forming structure with an anti-springback function, which is applied to the technical field of stamping forming dies and is provided with a multi-stage elastic release structure, the multi-stage elastic release structure can release stress in order step by step according to the change condition of residual stress after a workpiece is stamped, and the stamping quality of the workpiece is improved. According to the structure, through the synergistic effect of the first-stage releasing assembly and the second-stage releasing assembly, buffering and stress releasing effects of different degrees can be provided, stress changes under different working conditions can be adapted, the size precision and the shape precision of a stamping part are guaranteed, and the stamping quality is improved. And by arranging the edge pressing assembly, stable and appropriate pressure can be applied to the workpiece in the stamping process, and the stability of the workpiece in the stamping process is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of stamping molds, and particularly relates to a stamping mold forming structure with an anti-springback function. Background Art

[0002] In modern industrial production, stamping molds, as an important forming tool, are widely used in many fields such as automobile manufacturing, electronic equipment, and household appliances. By applying pressure to metal or other materials, stamping molds cause plastic deformation to obtain workpieces with the required shapes and sizes.

[0003] Currently, after the workpiece is stamped by a traditional stamping mold, large residual stresses will be generated inside the workpiece. When the mold is unloaded, these residual stresses will cause the workpiece to spring back, resulting in deviations between the actual size and shape of the workpiece and the design requirements. This springback phenomenon not only affects the accuracy and quality of the workpiece but may also cause subsequent processing operations to be unable to proceed smoothly, increasing the scrap rate and production costs.

[0004] Combined with the above problem entry points, it can be found that the prior art mainly adopts some conventional methods to reduce stress concentration during the stamping process of the workpiece by optimizing the structural design of the mold, thereby reducing springback. However, this method has limited effects on stamping complex-shaped workpieces or high-strength materials and requires multiple tests and adjustments of the mold, resulting in high costs. Some other technologies improve the forming quality of the workpiece by controlling stamping process parameters such as stamping speed and pressure. However, this method has high technical requirements for operators and is difficult to accurately control in actual production. It is easily affected by equipment performance and material characteristics and cannot achieve the desired effect. Therefore, a stamping mold forming structure with an anti-springback function is proposed, which can gradually and orderly release the residual stress of the workpiece during use, effectively avoiding the instantaneous unloading of stress, thereby significantly reducing the springback phenomenon of the workpiece. Summary of the Invention

[0005] The object of the present invention is to provide a stamping die forming structure with an anti-rebound function. The advantage is that by setting a multi-stage elastic release structure, the multi-stage elastic release structure can release stress step by step and orderly according to the change of the residual stress of the workpiece after stamping, effectively avoiding the instantaneous unloading of stress, fundamentally reducing the rebound phenomenon of the workpiece. Through the synergistic effect of the primary release component and the secondary release component, this structure can provide buffering and stress release effects of different degrees, adapt to the stress changes under different working conditions, ensure the dimensional accuracy and shape accuracy of the stamping parts, improve the product quality, and by setting a blank holding component, it can apply a stable and appropriate pressure to the workpiece during stamping, ensure the stability of the workpiece during stamping, and cooperate with the upper die base, making the stamping process more accurate, reducing the displacement and deformation of the workpiece during stamping, and providing a good foundation for the subsequent work of the multi-stage elastic release structure.

[0006] The above technical object of the present invention is achieved by the following technical solution: A stamping die forming structure with an anti-rebound function, including a fixed seat and a movable seat. On the opposite sides of the fixed seat and the movable seat, a lower die base and an upper die base are respectively bolted. A stripping push plate is slidably arranged inside the lower die base, and a multi-stage elastic release structure is bolted to the bottom of the stripping push plate. The bottom of the multi-stage elastic release structure is bolted to the fixed seat. Guide rods are bolted at the four corners of the top of the fixed seat, and the tops of the guide rods extend to the top of the movable seat. A blank holding component is bolted to the bottom of the movable seat, and the blank holding component is used in cooperation with the upper die base;

[0007] The multi-stage elastic release structure includes a support plate bolted to the bottom of the stripping push plate. Connecting plates are bolted to the front side and the rear side of the support plate. Guide columns penetrate through both sides inside the connecting plates. The bottoms of the guide columns are bolted to the fixed seat. A pushing ring, a primary release component and a secondary release component are sequentially sleeved on the surface of the guide column from top to bottom. A first return spring is sleeved on the top surface of the guide column, and the top and bottom of the first return spring are respectively connected to the pushing ring and the connecting plate.

[0008] Adopting the above technical solution, by setting a multi-stage elastic release structure, during stamping, the upper die base applies pressure to the workpiece and makes the stripping push plate enter the inside of the lower die base, while compressing the first return spring, the primary release component and the secondary release component step by step. When stamping is completed, the first return spring has the fastest recovery speed, and the recovery speeds of the primary release component and the secondary release component decrease step by step. Therefore, after stamping, the workpiece can release stress step by step and orderly, effectively avoiding the instantaneous unloading of stress, and fundamentally reducing the rebound phenomenon of the workpiece.

[0009] The present invention is further configured that: the primary release assembly includes an upper connection ring and a lower connection ring. Both the upper connection ring and the lower connection ring are slidably sleeved on the surface of the guide post. On the opposite sides of the upper connection ring and the lower connection ring, two rubber tubes are provided. Inside the guide post, a fixed shell is provided, and a fixed column is bolted inside the fixed shell. A pressing plate is slidably sleeved on the surface of the fixed column. At the bottom of the surface of the fixed column, an adjusting member is sleeved, and the bottom of the fixed column extends to the bottom of the fixed shell. The surface of the fixed column is communicated with a flexible telescopic tube, and the flexible telescopic tube is communicated with the lower connection ring on the side close to it. A second return spring is sleeved on the surface of the fixed column, and the two sides of the second return spring close to the pressing plate and the inner wall of the fixed shell are connected to the two respectively.

[0010] With the above technical solution, by setting the primary release assembly, when stamping, when the first return spring is compressed to the limit, it will push the upper connection ring to move through the pushing ring, and compress the rubber tubes, so that the gas in the two rubber tubes enters the inside of the fixed shell through the lower connection ring and pushes the pressing plate to move up along the fixed column. At the same time, the second return spring contracts. When the primary release assembly returns, due to the increase in the volume between the two rubber tubes, the second return spring will overcome the pressure of the gas, and the pressing plate can squeeze the gas in the fixed shell back to between the rubber tubes. During this process, by controlling the gas flow rate through the adjusting member, the effect of adjusting the recovery speed of the primary release assembly can be achieved. Therefore, the further release of the stress of the workpiece is realized.

[0011] The present invention is further configured that: there is a cavity between the opposite sides of the two rubber tubes, and the cavity is filled with gas. The inside of the lower connection ring is hollow, and a hole communicating with the cavity is opened at the top of the lower connection ring. The two rubber tubes are integrally arranged in a wavy shape.

[0012] With the above technical solution, through the cavity between the opposite sides of the two rubber tubes and the gas filled inside, as well as the wavy setting, the elasticity and deformation ability of the rubber tubes are enhanced, and they can better absorb pressure and release stress. The hollow setting of the lower connection ring and the holes communicating with the cavity ensure the gas circulation and pressure balance, and improve the stability and reliability of the primary release assembly.

[0013] The present invention is further configured that: the adjusting member includes a sleeve shell. The sleeve shell is sleeved on the bottom of the surface of the fixed column, and the bottom of the sleeve shell is connected to the inner wall of the fixed shell. An adjusting ring is rotatably connected inside the sleeve shell. Circulation holes are annularly opened on the inner parts of the adjusting ring and the sleeve shell and on the surface of the fixed column, and adjacent two circulation holes are communicated. On the front side and the rear side of the bottom of the adjusting ring, support blocks are bolted, and the support blocks are in rotational contact with the inner wall of the sleeve shell.

[0014] With the above technical solution, by setting the adjusting member, the adjusting ring can be rotated inside the sleeve housing, changing the communication situation of the flow holes between the adjusting ring and the inside of the sleeve housing, and accordingly changing the gas flow rate and pressure. When a faster recovery speed is required, more gas can be made to flow through, increasing the reset speed of the rubber tube; conversely, the gas flow is reduced, lowering the reset speed of the rubber tube. Thus, stress can be released orderly according to the change of the residual stress of the workpiece after stamping, effectively avoiding the instantaneous unloading of stress.

[0015] The present invention is further configured as: a driving gear is rotatably connected to the rear side of the top inside the sleeve housing, and a toothed ring is bolted to the top of the adjusting ring, and the toothed ring meshes with the driving gear.

[0016] With the above technical solution, by setting the driving gear and the toothed ring, the effect of driving the adjusting ring to rotate inside the sleeve housing can be achieved.

[0017] The present invention is further configured as: the secondary release assembly includes a movable plate and a fixed plate. Both the movable plate and the fixed plate are sleeved on the surface of the guide post, and the top of the movable plate contacts the lower connecting ring. A fixed cylinder is bolted annularly to the top of the fixed plate, and an inner cylinder is bolted inside the fixed cylinder. A moving member is slidably arranged inside the inner cylinder, and a moving rod is bolted to the top of the moving member, and the top of the moving rod is bolted to the movable plate. A third reset spring is arranged between the moving member and the inner wall of the fixed cylinder.

[0018] With the above technical solution, by setting the secondary release assembly, when the primary release assembly is compressed, it will push the movable plate downward, and the moving rod will push the moving member to move inside the inner cylinder, and the third reset spring will contract, squeezing the oil in the inner cylinder to enter the upper part of the inner cylinder from between the inner cylinder and the fixed cylinder. When the moving member needs to be reset, since the oil in the upper part of the inner cylinder will form a damping effect, it can effectively slow down the movement speed of the moving member and the moving rod, making the stress release more stable. Therefore, the stress of the workpiece after stamping can be released to the greatest extent, reducing its springback degree.

[0019] The present invention is further configured as: a flow cavity is formed between the surface of the inner cylinder and the inner wall of the fixed cylinder. A one-way valve and a notch are annularly arranged at the top and bottom inside the inner cylinder respectively, and both the one-way valve and the notch communicate with the flow cavity. The bottom inside the inner cylinder is filled with oil.

[0020] With the above technical solution, through the flow cavity between the surface of the inner cylinder and the inner wall of the fixed cylinder and the setting of the oil, a damping structure is formed, which can effectively slow down the movement speed of the moving member, making the stress release more stable. The setting of the one-way valve and the notch ensures the one-way flow of the oil, improving the stability and reliability of the damping structure.

[0021] The present invention is further configured such that: the moving member includes a moving piston, the moving piston is slidably disposed inside the inner cylinder, a sealing ring is sleeved on the surface of the moving piston, and the surface of the sealing ring is in sliding contact with the inner wall of the inner cylinder. An annular liquid passing hole is formed inside the moving piston. A support ring is disposed at the bottom inside the liquid passing hole, a fourth return spring is disposed on the top of the support ring, a plug block is connected to the top of the fourth return spring, a guiding cylinder is in close contact with the surface of the plug block, and the surface of the guiding cylinder is connected to the inner wall of the liquid passing hole.

[0022] By adopting the above technical solution, by providing the moving member, the moving rod can move inside the inner cylinder through the moving piston, and the sealing ring can seal between the moving piston and the inner cylinder. When the moving piston moves upward, since the volume above the inner cylinder decreases, the pressure of the hydraulic oil will increase, overcoming the elasticity of the fourth return spring, causing the plug block to separate from the guiding cylinder. Therefore, the hydraulic oil can enter the lower part of the inner cylinder through the liquid passing hole. During this process, the change of the hydraulic oil will reduce the return rate of the moving rod, so that the stamping energy of the workpiece is gradually released and more smoothly.

[0023] The present invention is further configured such that: the blank holder assembly includes a blank holder seat, positioning rods are bolted to the four corners of the top of the blank holder seat, the top of the positioning rods extends to the top of the movable seat and is slidably connected thereto. A pressing spring is sleeved on the surface of the positioning rods, and the bottom and top of the pressing spring are respectively connected to the blank holder seat and the movable seat. A stamping hole position for cooperating with the upper die holder is formed inside the blank holder seat.

[0024] By adopting the above technical solution, by providing the blank holder assembly, during stamping, the movable seat drives the blank holder seat to move downward and first contacts the workpiece. As the movable seat continues to move, the upper die holder will squeeze the pressing spring and compress it, increasing the pressure exerted by the blank holder seat on the workpiece. The positioning rods can ensure the movement accuracy of the blank holder seat and prevent it from shifting. After stamping, the pressing spring returns to its original state and drives the blank holder seat to move upward, releasing the pressing on the workpiece. Therefore, a stable and appropriate pressure can be applied to the workpiece during stamping, ensuring the stability of the workpiece during stamping. The cooperation with the upper die holder makes the stamping process more precise, reducing the displacement and deformation of the workpiece during stamping, providing a good foundation for the subsequent multi-stage elastic release structure to work.

[0025] The present invention is further configured such that: the first return spring, the pushing ring, the primary release assembly and the secondary release assembly are integrally arranged in series on the surface of the guide post.

[0026] By adopting the above technical solution, the orderly operation of the multi-stage elastic release structure is ensured by the series arrangement of the first return spring, the push ring, the first-stage release assembly and the second-stage release assembly on the guide column. This series arrangement enables the stress to be released step by step, avoids instantaneous unloading of stress, and effectively reduces the rebound phenomenon of the workpiece.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. By setting a multi-level elastic release structure, the multi-level elastic release structure can release stress step by step and in order according to the change of residual stress of the workpiece after stamping, effectively avoiding the instantaneous unloading of stress and fundamentally reducing the rebound phenomenon of the workpiece. The structure can provide different degrees of buffering and stress release effects through the synergistic effect of the first-level release component and the second-level release component, adapt to the stress changes under different working conditions, ensure the dimensional accuracy and shape accuracy of the stamping parts, and improve product quality;

[0029] 2. By setting up the edge holding assembly, a stable and appropriate pressure can be applied to the workpiece during the stamping process to ensure the stability of the workpiece during the stamping process. When used in conjunction with the upper die seat, the stamping process is more precise, reducing the displacement and deformation of the workpiece during the stamping process, providing a good foundation for the subsequent multi-stage elastic release structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the connection between the edge pressing assembly and the movable seat of the present invention;

[0032] Figure 3 It is a schematic diagram of the connection between the multi-stage elastic release structure and the lower die base of the present invention;

[0033] Figure 4 It is a schematic diagram of the connection between the unloading push plate and the multi-stage elastic release structure of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the primary release assembly of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the regulating member of the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the secondary release assembly of the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of the moving part of the present invention.

[0038] Reference numerals: 1, fixed seat; 2, movable seat; 3, lower die holder; 4, upper die holder; 5, stripping push plate; 6, multi-stage elastic release structure; 61, support plate; 62, connecting plate; 63, guide pillar; 64, pushing ring; 65, first-stage release component; 651, upper connecting ring; 652, lower connecting ring; 653, rubber tube; 654, fixed shell; 655, fixed column; 656, pressing plate; 657, flexible telescopic tube; 658, second return spring; 659, adjusting member; 659a, sleeve; 659b, adjusting ring; 659c, flow-through hole; 659d, support block; 66, second-stage release component; 661, movable plate; 662, fixed plate; 663, fixed cylinder; 664, inner cylinder; 665, moving member; 665a, moving piston; 665b, sealing ring; 665c, liquid passing hole; 665d, support ring; 665e, fourth return spring; 665f, blocking block; 665g, diversion cylinder; 666, moving rod; 667, third return spring; 67, first return spring; 7, guide rod; 8, blank holding component; 81, blank holding seat; 82, positioning rod; 83, pressing spring; 9, driving gear; 10, gear ring. Detailed implementation manners

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Refer to Figure 1-8 , a stamping die forming structure with an anti-rebound function, including a fixed seat 1 and a movable seat 2. The opposite sides of the fixed seat 1 and the movable seat 2 are respectively bolted with a lower die holder 3 and an upper die holder 4. A stripping push plate 5 is slidably arranged inside the lower die holder 3, and a multi-stage elastic release structure 6 is bolted to the bottom of the stripping push plate 5. The bottom of the multi-stage elastic release structure 6 is bolted to the fixed seat 1. Guide rods 7 are bolted at the four corners of the top of the fixed seat 1, and the tops of the guide rods 7 extend to the top of the movable seat 2. A blank holding component 8 is bolted to the bottom of the movable seat 2, and the blank holding component 8 is used in cooperation with the upper die holder 4;

[0041] The multi-stage elastic release structure 6 includes a support plate 61. The support plate 61 is bolted to the bottom of the unloading push plate 5, and connecting plates 62 are bolted to the front and rear sides of the support plate 61. Guide posts 63 penetrate through both sides inside the connecting plates 62. The bottom of the guide posts 63 is bolted to the fixed seat 1. A pushing ring 64, a first-stage release assembly 65, and a second-stage release assembly 66 are sequentially sleeved on the surface of the guide posts 63 from top to bottom. A first return spring 67 is sleeved on the top of the surface of the guide posts 63, and the top and bottom of the first return spring 67 are respectively connected to the pushing ring 64 and the connecting plate 62. By setting the multi-stage elastic release structure 6, during stamping, the upper die holder 4 applies pressure to the workpiece and makes the unloading push plate 5 enter the inside of the lower die holder 3. At the same time, the first return spring 67, the first-stage release assembly 65, and the second-stage release assembly 66 are gradually compressed. When stamping is completed, the first return spring 67 has the fastest recovery speed, while the recovery speeds of the first-stage release assembly 65 and the second-stage release assembly 66 gradually decrease. Therefore, after stamping, the workpiece can release stress step by step and orderly, effectively avoiding the instantaneous unloading of stress and fundamentally reducing the springback phenomenon of the workpiece.

[0042] As Figure 5 shown, the first-stage release assembly 65 includes an upper connecting ring 651 and a lower connecting ring 652. Both the upper connecting ring 651 and the lower connecting ring 652 are slidably sleeved on the surface of the guide post 63. Two rubber tubes 653 are arranged on the opposite sides of the upper connecting ring 651 and the lower connecting ring 652. A fixed shell 654 is arranged inside the guide post 63, and a fixed column 655 is bolted inside the fixed shell 654. A pressing plate 656 is slidably sleeved on the surface of the fixed column 655. An adjusting part 659 is sleeved on the bottom of the surface of the fixed column 655, and the bottom of the fixed column 655 extends to the bottom of the fixed shell 654. A flexible telescopic tube 657 is communicated with the surface of the fixed column 655, and the side of the flexible telescopic tube 657 close to the lower connecting ring 652 is communicated with it. A second return spring 658 is sleeved on the surface of the fixed column 655, and the sides of the second return spring 658 close to the pressing plate 656 and the inner wall of the fixed shell 654 are respectively connected to the two. By setting the first-stage release assembly 65, during stamping, when the first return spring 67 is compressed to the limit, it will push the upper connecting ring 651 to move through the pushing ring 64 and compress the rubber tubes 653, so that the gas in the two rubber tubes 653 enters the inside of the fixed shell 654 through the lower connecting ring 652 and pushes the pressing plate 656 to move upward along the fixed column 655. At the same time, the second return spring 658 contracts. When the first-stage release assembly 65 recovers, due to the increase in the volume between the two rubber tubes 653, the second return spring 658 can overcome the pressure of the gas and can make the pressing plate 656 squeeze the gas in the fixed shell 654 back to the space between the rubber tubes 653. By controlling the gas flow rate through the adjusting part 659 during this process, the effect of adjusting the recovery speed of the first-stage release assembly 65 can be achieved. Therefore, the further release of the stress of the workpiece is realized.

[0043] As Figure 5 shown, a cavity is provided between the opposite sides of the two rubber tubes 653, and the cavity is filled with gas. The interior of the lower connecting ring 652 is hollow, and a hole communicating with the cavity is provided at the top of the lower connecting ring 652. The two rubber tubes 653 are integrally arranged in a wavy shape. Through the cavity between the opposite sides of the two rubber tubes 653, the gas filled inside, and the wavy arrangement, the elasticity and deformation ability of the rubber tube 653 are enhanced, and it can better absorb pressure and release stress. The hollow setting of the lower connecting ring 652 and the hole communicating with the cavity ensure the circulation of gas and the balance of pressure, improving the stability and reliability of the primary release assembly 65.

[0044] As Figure 6 shown, the adjusting member 659 includes a housing 659a. The housing 659a is sleeved on the bottom surface of the fixed column 655, and the bottom of the housing 659a is connected to the inner wall of the fixed housing 654. An adjusting ring 659b is rotatably connected inside the housing 659a. Circulation holes 659c are annularly formed on the surfaces of the adjusting ring 659b and the inner part of the housing 659a and the surface of the fixed column 655, and adjacent two circulation holes 659c are communicated with each other. Blocks 659d are bolted to the front side and the rear side of the bottom of the adjusting ring 659b, and the blocks 659d are in rotational contact with the inner wall of the housing 659a. By providing the adjusting member 659, by rotating the adjusting ring 659b inside the housing 659a, the communication situation of the circulation holes 659c between the adjusting ring 659b and the inside of the housing 659a changes, and the gas flow rate and pressure also change accordingly. When a faster recovery speed is required, more gas can be made to flow through to increase the reset speed of the rubber tube 653; conversely, the gas flow is reduced to lower the reset speed of the rubber tube 653, so that the stress can be released orderly according to the change of the residual stress of the workpiece after stamping, effectively avoiding the instantaneous unloading of stress.

[0045] As Figure 6 shown, a driving gear 9 is rotatably connected to the rear side of the top inside the housing 659a, and a toothed ring 10 is bolted to the top of the adjusting ring 659b. The toothed ring 10 meshes with the driving gear 9. By providing the driving gear 9 and the toothed ring 10, the effect of driving the adjusting ring 659b to rotate inside the housing 659a can be achieved.

[0046] As Figure 7As shown, the secondary release component 66 includes a movable plate 661 and a fixed plate 662. Both the movable plate 661 and the fixed plate 662 are sleeved on the surface of the guide post 63. The top of the movable plate 661 contacts the lower connecting ring 652. The top of the fixed plate 662 is annularly bolted with a fixed cylinder 663, and an inner cylinder 664 is bolted inside the fixed cylinder 663. A moving member 665 is slidably arranged inside the inner cylinder 664, and a moving rod 666 is bolted to the top of the moving member 665. The top of the moving rod 666 is bolted to the movable plate 661. A third return spring 667 is arranged between the moving member 665 and the inner wall of the fixed cylinder 663. By setting the secondary release component 66, when the primary release component 65 is compressed, it will push the movable plate 661 downward, and the moving rod 666 will push the moving member 665 to move inside the inner cylinder 664, and the third return spring 667 will contract, squeezing the oil in the inner cylinder 664 to enter the upper part of the inner cylinder 664 from between the inner cylinder 664 and the fixed cylinder 663. When the moving member 665 needs to be reset, since the oil above the inner cylinder 664 forms a damping effect, it can effectively slow down the movement speed of the moving member 665 and the moving rod 666, making the stress release more stable. Therefore, the stress of the workpiece after stamping can be released to the greatest extent, reducing its springback degree.

[0047] As Figure 7 shown, a flow chamber is formed between the surface of the inner cylinder 664 and the inner wall of the fixed cylinder 663. A one-way valve and a notch are annularly arranged at the top and bottom inside the inner cylinder 664 respectively, and both the one-way valve and the notch communicate with the flow chamber. The bottom inside the inner cylinder 664 is filled with oil. Through the flow chamber between the surface of the inner cylinder 664 and the inner wall of the fixed cylinder 663 and the setting of the oil, a damping structure is formed, which can effectively slow down the movement speed of the moving member 665, making the stress release more stable. The setting of the one-way valve and the notch ensures the one-way flow of the oil, improving the stability and reliability of the damping structure.

[0048] As Figure 8As shown, the moving member 665 includes a moving piston 665a which is slidably arranged inside the inner cylinder 664. A sealing ring 665b is sleeved on the surface of the moving piston 665a, and the surface of the sealing ring 665b is in sliding contact with the inner wall of the inner cylinder 664. A liquid passing hole 665c is annularly formed inside the moving piston 665a. A support ring 665d is arranged at the bottom inside the liquid passing hole 665c, and a fourth return spring 665e is arranged on the top of the support ring 665d. The top of the fourth return spring 665e is connected with a plug 665f. A diversion cylinder 665g is in close contact with the surface of the plug 665f, and the surface of the diversion cylinder 665g is connected with the inner wall of the liquid passing hole 665c. By arranging the moving member 665, the moving rod 666 can move inside the inner cylinder 664 through the moving piston 665a, and the sealing ring 665b can seal between the moving piston 665a and the inner cylinder 664. When the moving piston 665a moves upward, since the volume above the inner cylinder 664 decreases, the pressure of the oil will increase, so that the oil pressure will overcome the elasticity of the fourth return spring 665e, and the plug 665f will be separated from the diversion cylinder 665g. Therefore, the oil can enter the lower part of the inner cylinder 664 through the liquid passing hole 665c. During this process, the change of the oil will reduce the return rate of the moving rod 666, so that the stamping energy of the workpiece is gradually released and more smoothly.

[0049] As Figure 2 shown, the blank holder assembly 8 includes a blank holder seat 81. Positioning rods 82 are bolted at the four corners of the top of the blank holder seat 81. The tops of the positioning rods 82 extend to the top of the movable seat 2 and are slidably connected thereto. A pressing spring 83 is sleeved on the surface of the positioning rod 82, and the bottom and the top of the pressing spring 83 are respectively connected with the blank holder seat 81 and the movable seat 2. A stamping hole position for cooperating with the upper die holder 4 is formed inside the blank holder seat 81. By arranging the blank holder assembly 8, during stamping, the movable seat 2 drives the blank holder seat 81 to move downward and first contacts the workpiece. As the movable seat 2 continues to move, the upper die holder 4 will squeeze the pressing spring 83 and compress it, which can increase the pressure exerted by the blank holder seat 81 on the workpiece. The positioning rods 82 can ensure the movement accuracy of the blank holder seat 81 and prevent it from shifting. After stamping, the pressing spring 83 returns to its original state and drives the blank holder seat 81 to move upward to release the blank holding of the workpiece. Therefore, a stable and appropriate pressure can be exerted on the workpiece during stamping to ensure the stability of the workpiece during stamping. The cooperation with the upper die holder 4 makes the stamping process more accurate, reduces the displacement and deformation of the workpiece during stamping, and provides a good foundation for the subsequent multi-stage elastic release structure 6 to work.

[0050] As Figure 3 and Figure 4As shown, the first return spring 67, the push ring 64, the primary release assembly 65 and the secondary release assembly 66 are integrally arranged in series on the surface of the guide post 63. By arranging the first return spring 67, the push ring 64, the primary release assembly 65 and the secondary release assembly 66 in series on the guide post 63, the orderly operation of the multi-stage elastic release structure 6 is ensured. This series arrangement enables the stress to be released step by step, avoids the instantaneous unloading of the stress, and effectively reduces the springback phenomenon of the workpiece.

[0051] Brief description of the usage process: Place the workpiece to be stamped on the lower die base 3, adjust the position to ensure that the workpiece is in the appropriate stamping area, and then drive the movable seat 2 and the blank holder 81 to move downward through external equipment such as a press. The blank holder 81 first contacts the workpiece. As the movable seat 2 continues to move, the upper die base 4 squeezes and compresses the pressure-resistant spring 83, which can increase the pressure exerted by the blank holder 81 on the workpiece. Subsequently, the upper die base 4 pushes the stamping position of the workpiece towards the position of the unloading push plate 5, and the unloading push plate 5 enters the interior of the lower die base 3. At the same time, the multi-stage elastic release structure 6 starts to work. The first return spring 67 is first compressed. As the unloading push plate 5 moves downward, the push ring 64 moves downward, driving the first-stage release assembly 65 and the second-stage release assembly 66 to be compressed step by step. For the first-stage release assembly 65, when the first return spring 67 is compressed to the limit, the push ring 64 pushes the upper connecting ring 651 to move downward along the guide post 63, causing the two rubber tubes 653 to be compressed. The gas in the rubber tubes 653 enters the interior of the fixed shell 654 through the holes in the lower connecting ring 652, pushing the pressing plate 656 to move upward along the fixed post 655 and simultaneously compressing the second return spring 658. For the second-stage release assembly 66, while the first-stage release assembly 65 is being compressed, the movable plate 661 is pushed downward by the lower connecting ring 652. The moving rod 666 drives the moving part 665 to move downward inside the inner cylinder 664, compressing the third return spring 667. The downward movement of the moving piston 665a squeezes the hydraulic fluid in the inner cylinder 664. The hydraulic fluid enters the flow chamber between the inner cylinder 664 and the fixed cylinder 663 through the notch at the bottom of the inner cylinder 664, and then enters the upper part of the inner cylinder 664 through the one-way valve at the top of the inner cylinder 664. After stamping is completed, the movable seat 2 drives the upper die base 4 and the blank holding assembly 8 to move upward. The pressure-resistant spring 83 returns to its original state, driving the blank holder 81 to move upward and releasing the blank holding of the workpiece. The multi-stage elastic release structure 6 starts to release stress. The first return spring 67 has the fastest recovery speed. It first starts to return to its original state, pushing the connecting plate 62 and the unloading push plate 5 upward. Then the first-stage release assembly 65 starts to recover. Since the volume of the two rubber tubes 653 decreases during compression and now increases, the internal gas pressure decreases. The second return spring 658 overcomes the gas pressure and pushes the pressing plate 656 to squeeze the gas in the fixed shell 654 back to between the rubber tubes 653. During this process, by adjusting the control member 659 to control the gas flow rate, the recovery speed of the first-stage release assembly 65 can be adjusted. When a faster recovery speed is required, rotate the adjusting ring 659b to connect the flow hole 659c between the adjusting ring 659b and the inner part of the sleeve 659a more, allowing more gas to flow through and increasing the reset speed of the rubber tubes 653; conversely, reduce the gas flow to lower the reset speed of the rubber tubes 653;When the secondary release component 66 is restored, due to the damping effect formed by the oil above the inner cylinder 664, the movement speeds of the moving part 665 and the moving rod 666 are effectively slowed down, making the stress release smoother. When the moving piston 665a moves upward, the volume above the inner cylinder 664 decreases, the oil pressure increases, overcoming the elasticity of the fourth return spring 665e, separating the plug 665f from the diversion cylinder 665g, and the oil enters the lower part of the inner cylinder 664 through the liquid passing hole 665c, further reducing the return rate of the moving rod 666, so that the stamping energy of the workpiece is gradually released. Finally, with the gradual restoration of the multi-stage elastic release structure 6, the unloading push plate 5 moves upward under the action of the multi-stage elastic release structure 6, pushing the stamped workpiece out of the lower die base 3 to complete the unloading operation. During the whole process, the series arrangement of the multi-stage elastic release structure 6 enables the stress to be released step by step and orderly, effectively avoiding the instantaneous unloading of the stress and fundamentally reducing the springback phenomenon of the workpiece.

[0052] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications without creative contributions to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A stamping die forming structure with an anti-rebound function, comprising a fixed seat (1) and a movable seat (2), characterized in that: On the opposite sides of the fixed seat (1) and the movable seat (2), a lower die seat (3) and an upper die seat (4) are respectively bolted. A stripping push plate (5) is slidably arranged inside the lower die seat (3), and a multi-stage elastic release structure (6) is bolted to the bottom of the stripping push plate (5). The bottom of the multi-stage elastic release structure (6) is bolted to the fixed seat (1). Guide rods (7) are bolted at the four corners of the top of the fixed seat (1), and the tops of the guide rods (7) extend to the top of the movable seat (2). A blank-holder assembly (8) is bolted to the bottom of the movable seat (2), and the blank-holder assembly (8) is used in cooperation with the upper die seat (4). The multi-stage elastic release structure (6) includes a support plate (61). The support plate (61) is bolted to the bottom of the stripping push plate (5), and connecting plates (62) are bolted to the front side and the rear side of the support plate (61). Guide columns (63) penetrate through both sides inside the connecting plates (62). The bottoms of the guide columns (63) are bolted to the fixed seat (1). A pushing ring (64), a first-stage release assembly (65), and a second-stage release assembly (66) are sequentially sleeved on the surface of the guide column (63) from top to bottom. A first return spring (67) is sleeved on the top surface of the guide column (63), and the top and the bottom of the first return spring (67) are respectively connected to the pushing ring (64) and the connecting plate (62).

2. The forming structure of a stamping die with an anti-rebound function according to claim 1, characterized in that: The first-stage release assembly (65) includes an upper connecting ring (651) and a lower connecting ring (652). Both the upper connecting ring (651) and the lower connecting ring (652) are slidably sleeved on the surface of the guide column (63). Two rubber tubes (653) are arranged on the opposite sides of the upper connecting ring (651) and the lower connecting ring (652). A fixed shell (654) is arranged inside the guide column (63), and a fixed column (655) is bolted inside the fixed shell (654). A pressing plate (656) is slidably sleeved on the surface of the fixed column (655). An adjusting part (659) is sleeved on the bottom surface of the fixed column (655), and the bottom of the fixed column (655) extends to the bottom of the fixed shell (654). A flexible telescopic tube (657) is communicated with the surface of the fixed column (655), and the flexible telescopic tube (657) is communicated with the lower connecting ring (652) on the side close to it. A second return spring (658) is sleeved on the surface of the fixed column (655), and the sides of the second return spring (658) close to the pressing plate (656) and the inner wall of the fixed shell (654) are respectively connected to the two.

3. The forming structure of a stamping die with an anti-rebound function according to claim 2, characterized in that: A cavity is arranged between the opposite sides of the two rubber tubes (653), and the cavity is filled with gas. The inside of the lower connecting ring (652) is hollow, and a hole communicating with the cavity is opened at the top of the lower connecting ring (652). The two rubber tubes (653) are integrally arranged in a wavy shape.

4. A stamping die forming structure with an anti-rebound function according to claim 2, characterized in that: The adjusting member (659) includes a housing (659a) sleeved on the bottom surface of the fixed column (655), and the bottom of the housing (659a) is connected to the inner wall of the fixed housing (654). An adjusting ring (659b) is rotatably connected inside the housing (659a). The inner part of the adjusting ring (659b) and the housing (659a) and the surface of the fixed column (655) are both provided with flow holes (659c) in a circular shape, and adjacent two flow holes (659c) are communicated. On the front side and the rear side of the bottom of the adjusting ring (659b), support blocks (659d) are bolted, and the support blocks (659d) are in rotational contact with the inner wall of the housing (659a).

5. The forming structure of a stamping die with an anti-rebound function according to claim 4, characterized in that: On the rear side of the inner top of the housing (659a), a driving gear (9) is rotatably connected, and a toothed ring (10) is bolted on the top of the adjusting ring (659b). The toothed ring (10) is meshed with the driving gear (9).

6. The forming structure of a stamping die with an anti-rebound function according to claim 2, characterized in that: The secondary release assembly (66) includes a movable plate (661) and a fixed plate (662). Both the movable plate (661) and the fixed plate (662) are sleeved on the surface of the guide post (63), and the top of the movable plate (661) contacts the lower connecting ring (652). On the top of the fixed plate (662), fixed cylinders (663) are bolted in a circular shape, and an inner cylinder (664) is bolted inside the fixed cylinder (663). A moving member (665) is slidably arranged inside the inner cylinder (664), and a moving rod (666) is bolted on the top of the moving member (665). The top of the moving rod (666) is bolted to the movable plate (661). A third return spring (667) is arranged between the moving member (665) and the inner wall of the fixed cylinder (663).

7. The forming structure of a stamping die with an anti-rebound function according to claim 6, characterized in that: A flow cavity is formed between the surface of the inner cylinder (664) and the inner wall of the fixed cylinder (663). At the top and the bottom of the inside of the inner cylinder (664), a one-way valve and a notch are respectively arranged in a circular shape, and both the one-way valve and the notch are communicated with the flow cavity. The bottom of the inside of the inner cylinder (664) is filled with oil.

8. A stamping die forming structure with an anti-rebound function according to claim 6, characterized in that: The moving member (665) includes a moving piston (665a) slidably arranged inside the inner cylinder (664). A sealing ring (665b) is sleeved on the surface of the moving piston (665a), and the surface of the sealing ring (665b) is in sliding contact with the inner wall of the inner cylinder (664). A liquid passing hole (665c) is formed in a circular shape inside the moving piston (665a). At the bottom of the inside of the liquid passing hole (665c), a support ring (665d) is arranged, and a fourth return spring (665e) is arranged on the top of the support ring (665d). The top of the fourth return spring (665e) is connected with a blocking block (665f). The surface of the blocking block (665f) is in close contact with a guide cylinder (665g), and the surface of the guide cylinder (665g) is connected with the inner wall of the liquid passing hole (665c).

9. A stamping die forming structure with an anti-rebound function according to claim 1, characterized in that: The blank-holder assembly (8) includes a blank-holder base (81). Positioning rods (82) are bolted to the four corners of the top of the blank-holder base (81). The top of the positioning rod (82) extends to the top of the movable seat (2) and is slidably connected thereto. A pressing spring (83) is sleeved on the surface of the positioning rod (82), and the bottom and top of the pressing spring (83) are respectively connected to the blank-holder base (81) and the movable seat (2). A stamping hole position for cooperating with the upper die base (4) is formed inside the blank-holder base (81).

10. A stamping die forming structure with an anti-rebound function according to claim 1, characterized in that: The first return spring (67), the pushing ring (64), the primary release assembly (65) and the secondary release assembly (66) are integrally arranged in series on the surface of the guide post (63).

Images