Progressive die for high-speed stamping production of chain plate

Abstract

A progressive die for high-speed stamping production of chain plates relates to the fields of progressive die and chain plate manufacturing technology, and comprises an upper die and a lower die, a material strip running channel is formed between the upper die and the lower die, and a guide punching station, a fine punching station, a half-cutting station, a blanking station, a second elastic component unloading station and a cutting station are sequentially arranged on the running channel. The progressive die for high-speed stamping production of chain plates can realize reverse half-cutting pre-deformation, blanking punch and elastic unloading and taking, significantly improve punching verticality and part flatness, reduce blanking force, prolong die life and realize non-destructive taking.

Description

Technical Field

[0001] This invention relates to the field of progressive die and chain plate manufacturing technology, specifically to a progressive die for high-speed stamping production of chain plates. Background Technology

[0002] The outer chain plate is a core component of the chain drive system, and its punching perpendicularity, cross-sectional quality, flatness, and positional accuracy are subject to extremely high requirements. Traditional high-speed progressive dies typically employ a single forward punching (the punch completes punching or blanking from top to bottom), which has the following problems: poor punching perpendicularity, low proportion of bright band on the cross-section, easy for parts to be bumped and deformed when falling freely after blanking, and large peak punching force leading to easy chipping of the punch.

[0003] During the blanking process, if the die guiding accuracy is insufficient or the clearance design is improper, the strip material will experience severe stress concentration at the cutting edge during a single forward blanking operation. The punch will bear lateral force, causing the hole wall to tilt. Simultaneously, the proportion of tear strips will be high, resulting in poor cross-sectional quality. After blanking, the parts may fall freely or be simply unloaded by blowing air, easily causing impacts and deformation, affecting flatness. Some existing technologies use reverse blanking (punch below, die above), but this only changes the cutting direction and does not address the fundamental problem from the perspective of stress release mechanism. If the above defects are not effectively controlled, it will lead to increased chain drive resistance and accelerated wear after chain plate assembly, and may even affect the overall reliability of the machine.

[0004] Currently, there is a lack of dedicated process solutions that balance quality and efficiency in high-precision chain plate punching. Traditional methods mainly rely on two approaches: one is to use conventional forward punching, which is efficient but fails to meet the standards for perpendicularity and cross-sectional quality; the other is to use reverse punching or multiple trimming, which partially improves perpendicularity but does not solve the problems of blanking damage and peak punching force, and also limits the lifespan of the die.

[0005] As the requirements for the precision of components in chain drive systems continue to increase, there is an urgent need for a chain plate punching die and part removal method that is technologically reasonable, structurally reliable, and can simultaneously improve the perpendicularity of punching, cross-sectional quality and flatness, while reducing the peak value of punching force, so as to solve the technical problem that it is difficult to achieve both processing accuracy and die life in the existing technology. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention discloses a progressive die for high-speed stamping production of chain plates. Through the synergistic effect of reverse half-shear pre-deformation, blanking punch and elastic unloading, it significantly improves the perpendicularity of punching and the flatness of parts, reduces the punching force, extends the die life, and achieves non-destructive part removal.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A progressive die for high-speed stamping production of chain plates includes an upper die and a lower die, forming a strip travel channel between the upper die and the lower die. The travel channel is sequentially provided with a guide punch station; a fine punch station; a half shear station; a blanking station; a second elastic component unloading station; and a cutting station. The aforementioned punching station is used to punch guide holes at both edges of the strip; the fine punching station is used to punch holes on the chain plate in the forward direction; the semi-shearing station uses the ejector of the lower die to push the strip from bottom to top, the horizontal projection contour of the working surface of the ejector top matches the finished shape of the chain plate, the working surface of the ejector is a plane, and the strip is partially lifted by the working surface of the ejector to form a pre-deformation mark with a height of 5% to 20% of the strip thickness; the blanking station uses the blanking punch of the upper die to punch the pre-deformation mark area from top to bottom, cutting the outline of the chain plate out of the strip; the pre-deformation releases stress concentration, making the blanking process smooth and the blanking punch has no lateral sway; the unloading second elastic component station uses the elastic force of the second elastic component to remove the chain plate that has been cut out, realizing the final separation of the chain plate from the strip; the cutting station is used to completely cut the strip and separate the strip waste.

[0008] Preferably, the progressive die has a one-out-of-four structure. The upper die, from top to bottom, includes an upper die base, an upper pad, an upper fixing plate, a guide plate pad, and a guide plate connected in sequence. The lower die, from top to bottom, includes a concave die plate, a lower fixing plate, a lower pad, and a lower die base connected in sequence. The upper and lower dies are connected by an inner guide post assembly and an outer guide post assembly. The upper die is equipped with guide pins, a misfeed sensor, and a misfeed detection device that cooperate with the guide holes. The lower die is equipped with a floating pin assembly and a precision positioning block.

[0009] Preferably, the ejector includes an ejector body, the bottom end of which is connected to a first elastic component. The first elastic component is fixedly connected to a preset mounting hole in the lower mold base. The lower end of the ejector body passes through the concave template, the lower fixing plate, and the lower pad in sequence and is connected to the top end of the first elastic component. In the initial state, the upper end of the ejector body protrudes from the concave template. The bottom end of the guide plate is provided with a cavity opposite to the ejector.

[0010] Preferably, the semi-shearing station and the blanking station are adjacent to each other vertically, and the blanking punch and the ejector are coaxial and opposite each other vertically. The blanking punch includes a punch body, and the punch body has a guide rod that mates with the hole of the chain plate along the vertical direction. The lower end of the guide rod has a hemispherical, conical, or cylindrical chamfered edge. The lower end of the punch body is also fixedly connected to a horizontal plate. The lower end of the guide rod passes through the horizontal plate, and the upper end of the guide rod is connected to the top of the punch body through an elastic element. The horizontal plate is used in conjunction with the top working surface of the ejector. The punch body and the die hole on the die plate are fitted with a clearance of 0.01mm. The cavity and the downward channel of the punch body are integrally formed.

[0011] Preferably, the unloading second elastic component station includes a second elastic component, which is installed on the upper fixed plate. The bottom end of the second elastic component passes through the guide plate pad and the guide plate in sequence. In the initial state, the bottom end of the second elastic component protrudes from the guide plate. The bottom edge of the second elastic component is rounded to facilitate the bottom end of the second elastic component to retract to the surface of the material belt when the material belt is moving. Alternatively, the second elastic component can be installed in the concave template of the lower mold. Its working principle is the same as before, and it is used to push the chain plate upward after the material is unloaded.

[0012] Preferably, the first elastic component and the second elastic component are made of springs or polyurethane elastomers.

[0013] The beneficial effects of the progressive die for high-speed stamping production of chain plates according to the present invention are as follows: This invention utilizes the synergistic effect of reverse semi-shear pre-deformation and a rounded corner punch. At the semi-shear station, the lower die plane ejector pushes out pre-deformation marks, releasing stress concentration. At the blanking station, the rounded corner punch gradually cuts in, minimizing lateral force on the punch and controlling the punching perpendicularity to within 0.05°. This increases the proportion of bright bands on the cross-section to over 90%, avoiding hole wall tilting and tearing defects caused by stress concentration in traditional single-stage punching. Simultaneously, the unloading spring controls the controlled removal of the chain plate, preventing impacts and deformation caused by free fall, ensuring part flatness ≤0.05mm and achieving non-destructive part removal. Through multi-level positioning coordination using guide plates, guide pins, inner and outer guide pillars, precision positioning, and a misfeed detection system, the step distance error is reduced to zero, improving the overall stamping accuracy of the chain plate. Furthermore, the peak punching force is reduced, the die impact load is decreased, and the punch life is extended, ensuring stability in high-speed production while reducing die maintenance costs. Attached Figure Description

[0014] Figure 1 This is a front view of a progressive die used in high-speed stamping production of chain plates; Figure 2 Left view of a progressive die used in high-speed stamping production of chain plates; Figure 3It is a progressive die chain plate blanking layout diagram used in high-speed stamping production of chain plates; Figure 4 This is a schematic diagram of a progressive die blanking process used in high-speed stamping production of chain plates. Figure 5 This is a schematic diagram of an ejector for a progressive die used in high-speed stamping production of chain plates ((a) top view of the ejector working surface; (b) top view of the chain plate mating with the ejector working surface).

[0015] In the diagram, 1. Upper mold base; 2. Upper backing plate; 3. Upper fixing plate; 4. Guide plate backing plate; 5. Guide plate; 6. Concave mold plate; 7. Lower fixing plate; 8. Lower backing plate; 9. Lower mold base; 10. First elastic component; 11. Outer guide post assembly; 12. Inner guide post assembly; 13. Guide pin; 14. Misfeed sensor; 15. Fixing bolt; 16. Pin; 17. Misfeed detection device; 18. Floating pin assembly; 19. 20. Precision positioning block; 21. Guide punch station; 22. Precision punch station; 23. Half shear station; 24. Blanking station; 25. Unloading second elastic component station; 26. Cutting station; 27. Chain plate; 28. Ejector; 29. ​​Material belt; 20. Blanking punch; 291. Punch body; 292. Guide rod; 293. Horizontal plate; 30. Second elastic component; 31. Material belt waste; 32. Hole formed on the material belt after blanking. Detailed Implementation

[0016] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0017] Example 1: A progressive die for high-speed stamping production of chain plates, such as Figure 1-5 As shown, it includes an upper die and a lower die, and a material strip travel channel is formed between the upper die and the lower die. The travel channel is provided with a guide punch station 20; a fine punch station 21; a half shear station 22; a blanking station 23; a second elastic component unloading station 24; and a cutting station 25 in sequence. The guide punching station 20 is used to punch guide holes at both edges of the strip; the fine punching station 21 is used to punch holes on the chain plate in the forward direction; the semi-shearing station 22 is where the ejector 27 of the lower die pushes the strip from bottom to top, the horizontal projection contour of the top working surface of the ejector 27 matches the finished shape of the chain plate 26, the working surface of the ejector 27 is a plane, and the strip 28 is partially lifted by the working surface of the ejector, forming a pre-deformation mark with a height of 5% to 20% of the thickness of the strip 28, without penetrating the strip; The blanking station 23 uses the blanking punch 29 of the upper die to punch the pre-deformation mark area from top to bottom, cutting out the outline of the chain plate 26 from the material strip; the pre-deformation releases stress concentration, making the blanking process smooth and the punch does not wobble laterally; the unloading second elastic component station 24 uses the elastic force of the second elastic component 30 to remove the chain plate 26 that has been cut out, realizing the final separation of the chain plate 26 from the material strip 28; the cutting station 25 is used to completely cut the material strip 28 and separate the material strip waste.

[0018] Example 2: like Figure 1 , 2 As shown, the progressive die has a one-out-four structure. The upper die, from top to bottom, includes an upper die base 1, an upper pad 2, an upper fixing plate 3, a guide plate pad 4, and a guide plate 5 connected in sequence. The lower die, from top to bottom, includes a concave die plate 6, a lower fixing plate 7, a lower pad 8, and a lower die base 9 connected in sequence. The upper and lower dies are connected by an inner guide post assembly 12 and an outer guide post assembly 11. The upper die is equipped with a guide pin 13 that works with the guide hole, a misfeed sensor 14, and a misfeed detection device 17. The lower die is equipped with a floating pin assembly 18 and a precision positioning block 19.

[0019] In this embodiment, the inner guide post assembly 12, outer guide post assembly 11, guide pin 13, misfeed sensor 14, misfeed detection device 17, floating pin assembly 18, and precision positioning block 19 are all existing technologies, and their specific structures and installation methods adopt existing solutions. Contents not described in this invention are solved using existing solutions. The material strip 28 travels between the guide plate and the concave template. When the upper die presses down, the guide plate contacts the material strip before the blanking punch, and the guide pin 13 is inserted into the guide hole to forcibly correct the step distance error. The inner guide post assembly 12 and the outer guide post assembly 11 ensure the alignment accuracy of the upper and lower dies. The misfeed detection device 14 and the misfeed sensor 17 work together to immediately stop the machine and alarm when the feeding step distance deviates, so as to avoid damage to the die.

[0020] Example 3: like Figure 1 , 4As shown in Figure 5, the ejector 27 includes an ejector body. The bottom end of the ejector body is connected to a first elastic component 10. The first elastic component 10 is fixedly connected to a preset mounting hole in the lower mold base. The lower end of the ejector body passes through the concave template 6, the lower fixing plate 7, and the lower pad 8 in sequence and is connected to the top end of the first elastic component 10. In the initial state, the upper end of the ejector body protrudes from the concave template 6. The bottom end of the guide plate 5 is provided with a cavity opposite to the ejector 27.

[0021] As described above, the top working surface of the ejector 27 is flat and its outline is the same as that of the chain plate 26. Under the action of the first elastic component 10, the ejector body is raised 0.15mm above the concave template in a free state. The guide plate 5 is provided with a cavity with a depth of 0.2mm at the corresponding position to allow the ejector 27 to push the material strip in.

[0022] Example 4: As a preferred option, such as Figure 1-5 As shown, the semi-shearing station 22 and the blanking station 23 are adjacent to each other vertically, and the blanking punch 29 and the ejector 27 are coaxial and opposite each other vertically. The blanking punch 29 includes a punch body 291. Inside the punch body 291, there is a guide rod 292 that mates with the hole of the chain plate 26 along the vertical direction. The lower end of the guide rod 292 has a hemispherical, conical, or cylindrical chamfered edge. The lower end of the punch body 291 is also fixedly connected to a horizontal plate 293. The lower end of the guide rod 292 passes through the horizontal plate 293. The upper end of the guide rod 292 is connected to the top of the punch body 291 through an elastic element (not shown in the figure). The horizontal plate 293 is used in conjunction with the top working surface of the ejector 27. The punch body 291 is fitted with a pre-set die hole on the die plate 6 with a clearance of 0.01mm. The cavity is integrally formed with the downward channel of the punch body 291.

[0023] During operation, the upper die descends, and the pressure plate 5 first clamps the strip 28. Then, under the action of the ejector 27, the strip pre-deforms and enters the clearance cavity. Afterward, the blanking punch 29 descends and engages with the die hole to cut out the outer shape of the chain plate 26. During this process, the guide rod first enters the hole in the chain plate 26 to achieve pre-positioning. Then, the lower edge of the punch body cuts into the strip. When the outer chain plate is completely cut off, the horizontal plate and the top working surface of the ejector cooperate to level the chain plate 26. Because the pre-deformation has released stress concentration, the blanking process is smooth, and the punch does not laterally wobble.

[0024] Example 5: like Figure 4As shown, the unloading second elastic component station 24 includes a second elastic component 30, which is installed on the upper fixed plate 3. The bottom end of the second elastic component passes through the guide plate pad 4 and the guide plate 5 in sequence. In the initial state, the bottom end of the second elastic component 30 protrudes from the guide plate 5. The bottom edge of the second elastic component is rounded (not shown in the figure) to facilitate the bottom end of the second elastic component 30 to retract to the surface of the material belt when the material belt is moving.

[0025] When the chain plate workpiece with its edges already cut reaches the unloading second elastic component station 24, it is pushed out of the chain plate by the second elastic component 30. As the chain plate falls along the preset channel of the lower die, it is blown into the collection box by the air blowing device. This process of the chain plate falling and being discharged and sent into the collection box by the air blowing device is existing technology and will not be described in detail here.

[0026] In another implementation, the second elastic component 30 is installed inside the concave template of the lower die. Its working principle is the same as before, used to push the unloaded chain plate upward. The initial pre-pressure of the unloading second elastic component 30 is greater than the friction between the chain plate 26 and the concave die wall. Before being pushed out, the chain plate workpiece is still relatively fixed to the material belt by friction. Through elastic pushing out, it can be ensured that the chain plate smoothly leaves the die surface and enters the preset channel, where it is sent into the collection box by the air blowing device.

[0027] Example 6: like Figure 5 As shown, the first elastic component 10 and the second elastic component 30 are made of springs or polyurethane elastomers. In this embodiment, a polyurethane column with a compression ratio of 25% is used below the ejector 27 of the half-shear station 22 to provide a stable and linear ejection force; the unloading second elastic component 30 station also uses a polyurethane elastomer to reduce operating noise.

[0028] The working process of the high-speed progressive die of the chain plate of the present invention is as follows: The press slide drives the upper die downwards. The guide plate 5 first contacts the strip 26, and the guide pin 13 inserts into the guide hole to force correction of the step distance. The slide continues to move downwards, sequentially completing the guide punch (punching the guide hole) and the fine punch (punching the chain plate hole). At the semi-shearing station 22, the lower die ejector 27 pushes out the pre-deformation mark upwards. At the blanking station 23, the blanking punch 29 completes the contour blanking downwards. The second elastic component 30 pushes out the separated chain plate 26, which is collected by air blowing. Finally, the cutting station 25 cuts off the remaining part of the strip 28. According to actual measurements, the speed of the entire stamping process can reach 200 times / minute.

[0029] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A progressive die for high-speed stamping production of chain plates, characterized in that, The device includes an upper die and a lower die, with a material strip travel channel formed between the upper die and the lower die. The travel channel is provided with the following stations in sequence: a guide punch station; a fine punch station; a half shear station; a blanking station; a second elastic component unloading station; and a cutting station. The aforementioned punching station is used to punch guide holes at both edges of the strip; the fine punching station is used to punch holes on the chain plate in the forward direction; the semi-shearing station uses the ejector of the lower die to push the strip from bottom to top, the horizontal projection contour of the working surface of the ejector top matches the finished shape of the chain plate, the working surface of the ejector is a plane, and the strip is partially lifted by the working surface of the ejector to form a pre-deformation mark with a height of 5% to 20% of the strip thickness; the blanking station uses the blanking punch of the upper die to punch the pre-deformation mark area from top to bottom, cutting the outline of the chain plate out of the strip; the pre-deformation releases stress concentration, making the blanking process smooth and the blanking punch has no lateral sway; the unloading second elastic component station uses the elastic force of the second elastic component to remove the chain plate that has been cut out, realizing the final separation of the chain plate from the strip; the cutting station is used to completely cut the strip and separate the strip waste.

2. The progressive die for high-speed stamping production of chain plates as described in claim 1, characterized in that, The progressive die has a one-out-of-four structure. The upper die, from top to bottom, includes an upper die base, an upper pad, an upper fixing plate, a guide plate pad, and a guide plate connected in sequence. The lower die, from top to bottom, includes a concave die plate, a lower fixing plate, a lower pad, and a lower die base connected in sequence. The upper and lower dies are connected by an inner guide post assembly and an outer guide post assembly. The upper die is equipped with guide pins, a misfeed sensor, and a misfeed detection device that cooperate with the guide holes. The lower die is equipped with a floating pin assembly and a precision positioning block.

3. A progressive die for high-speed stamping production of chain plates as described in claim 2, characterized in that, The ejector includes an ejector body. The bottom end of the ejector body is connected to a first elastic component. The first elastic component is fixedly connected to a preset mounting hole in the lower mold base. The lower end of the ejector body passes through the concave template, the lower fixing plate, and the lower pad in sequence and is connected to the top end of the first elastic component. In the initial state, the upper end of the ejector body protrudes from the concave template. The bottom end of the guide plate is provided with a cavity opposite to the ejector.

4. A progressive die for high-speed stamping production of chain plates as described in claim 3, characterized in that, The semi-shearing station and the blanking station are adjacent to each other vertically, and the blanking punch and the ejector are coaxial and opposite each other vertically. The blanking punch includes a punch body, and the inside of the punch body is provided with a guide rod that mates with the hole of the chain plate along the vertical direction. The lower end of the guide rod is hemispherical, conical or cylindrical with a chamfered edge. The lower end of the punch body is also fixedly connected to a horizontal plate. The lower end of the guide rod passes through the horizontal plate, and the upper end of the guide rod is connected to the top of the punch body through an elastic element. The horizontal plate is used in conjunction with the top working surface of the ejector. The punch body and the die hole on the die plate are fitted with a clearance of 0.01mm. The cavity and the downward channel of the punch body are integrally formed.

5. A progressive die for high-speed stamping production of chain plates as described in claim 4, characterized in that, The unloading second elastic component station includes a second elastic component, which is installed on the upper fixed plate. The bottom end of the second elastic component passes through the guide plate pad and the guide plate in sequence. In the initial state, the bottom end of the second elastic component protrudes from the guide plate. The bottom edge of the second elastic component is rounded to facilitate the bottom end of the second elastic component to retract to the surface of the material belt when the material belt is moving. Alternatively, the second elastic component can be installed in the concave template of the lower mold. Its working principle is the same as before, and it is used to push the chain plate upward after the material is unloaded.

6. A progressive die for high-speed stamping production of chain plates as described in claim 5, characterized in that, The first and second elastic components are made of springs or polyurethane elastomers.

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