A bright punching device for toothed chain plates with a thickness greater than 2 mm

Abstract

A device for bright blanking of toothed chain plates with a thickness greater than 2 mm belongs to the technical field of bright blanking of toothed chain plates with large thickness. The device comprises, from top to bottom, an upper die seat, an upper clamping plate back plate, an upper clamping plate, a stripper plate back plate, a stripper plate clamping plate, a concave mold plate, a concave mold pad, a lower die seat and a lower pad. The upper clamping plate back plate, the upper clamping plate, the stripper plate back plate and the stripper plate clamping plate are fixedly connected to the lower end face of the upper die seat, the concave mold plate and the concave mold pad are fixedly connected to the upper end face of the lower die seat, the lower die seat and the lower pad are fixedly connected by bolts, a rough punching die, a fine punching die and a plurality of blanking dies are provided in the concave mold plate, and a plurality of groups of rough punching pins and fine punching pins used in conjunction with the same are also provided. During the punching process, the present invention can ensure the chain plate and aperture shape of the toothed chain of the thickness, improve the bright band around the chain plate and the aperture, and cause little damage to the mold, which is beneficial to ensuring the service life of the mold. It can realize fast and efficient mass punching of large-thickness toothed chain plates, especially those with a thickness greater than 2.0 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of bright punching of toothed chain plates with large thickness, and in particular relates to a bright punching device for toothed chain plates with a thickness greater than 2 mm. Background Art

[0002] The toothed chain transmits power by meshing the end faces of the chain plate teeth with the end faces of the sprocket teeth. The larger the contact area of ​​the tooth surface and the brighter the tooth surface, the greater the effective load that can be transmitted and the higher the transmission efficiency. Therefore, in the process of punching the toothed chain plate, bright punching technology is required to ensure the bright band at the meshing part of the chain plate teeth, while also ensuring the flatness of the teeth, ensuring the smoothness of the meshing, and reducing the impact noise.

[0003] During the rotation of the toothed chain, the hinge pair and the inner hole of the chain plate will rub against each other. In order to ensure the service life of the toothed chain, it is necessary to ensure the verticality of the chain plate hole and use bright punching technology for the inner hole.

[0004] Existing progressive die punching technology for toothed chains is mostly suitable for thinner chain plates with smaller holes. If traditional punching technology is used for punching chain plates with a thickness of ≥2.0mm, it will cause serious deformation of the chain plates and holes, and the surrounding and hole bright bands cannot be guaranteed; and if a single composite die is used to punch thick chain plates, the punch and rivet are easily damaged, and the punching efficiency is extremely low. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention discloses a bright punching device for toothed chain plates with a thickness greater than 2 mm, which can ensure the shape of the chain plates and the apertures, as well as the bright bands around the chain plates and the apertures, and can protect the mold and can be used for mass production.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A bright blanking device for a toothed chain plate with a thickness greater than 2mm, which comprises, from top to bottom, an upper die seat, an upper clamping plate back plate, an upper clamping plate, a stripping plate back plate, a stripping plate clamping plate, a concave mold plate, a concave mold pad, a lower die seat, and a lower pad. The upper clamping plate back plate, the upper clamping plate, the stripping plate back plate, the stripping plate clamping plate and the lower end face of the upper die seat are bolted in sequence, the concave mold plate and the concave mold pad are fixedly connected to the upper end face of the lower die seat, and the lower die seat and the lower pad are fixed by bolts. Connection, the upper splint back plate is elastically connected to the upper splint through a spring, and a rough punching die, a fine punching die and a plurality of blanking dies are provided in the concave mold plate; the rough punching die and the fine punching die are also provided with a plurality of groups of rough punching pins and fine punching pins used therewith, the upper ends of the rough punching pins and the fine punching pins are fixedly connected to the lower end surface of the upper splint back plate, and the lower ends of the rough punching pins and the fine punching pins correspond to the die holes of the rough punching die and the fine punching die respectively.

[0008] Preferably, the blanking die is arranged in a die frame that penetrates the die template and extends into the die pad, and is fixedly connected to the die frame by bolts. A connecting rod in the vertical direction is also fixedly connected to the outer surface of the bottom end of the blanking die. The connecting rod passes through the bottom end of the die frame. An elastic device is also provided below the connecting rod. The elastic device includes an upper spring fixing plate, a lower spring fixing plate, and a top spring arranged between the upper spring fixing plate and the lower spring fixing plate. The lower end of the connecting rod is fixedly connected to the upper end surface of the upper spring fixing plate. The elastic device is arranged in the lower die seat, and the lower end of the lower spring fixing plate is fixedly connected to the lower pad.

[0009] Preferably, a die core is provided in the blanking die, and a blanking positioning component is also provided above the die core. The blanking positioning component includes a chain plate positioning pin, a blanking punch sleeved on the outer periphery of the chain plate positioning pin, and a punch guide insert slidably connected to the blanking punch. The punch guide insert is provided with a through hole penetrating the upper and lower end surfaces, and the blanking punch is slidably connected to the punch guide insert through the through hole, and the punch guide insert is fixedly connected to the stripping plate clamp. The chain plate positioning pin is arranged in the blanking punch along the vertical direction and is gap-matched with the blanking punch. The top end of the blanking punch is fixedly connected to the lower end surface of the upper clamping plate back plate. The bottom ends of the punch guide insert and the chain plate positioning pin are lower than the bottom end of the blanking punch. The blanking punch and the die core are used in conjunction with each other, and the blanking punch and the die core are gap-matched. A discharge hole is provided at the bottom of the blanking die.

[0010] Preferably, the gap between the chain plate positioning pin and the blanking punch is in the range of 0.01-0.012 mm, the gap between the blanking punch and the blanking die and the die core is in the range of 0.025-0.035 mm, and the diameter of the chain plate positioning pin is 0.01 mm smaller than the diameter of the die hole of the fine punching groove.

[0011] Preferably, blanking holes are provided at the lower ends of the die holes of the rough punching die and the fine punching die, and the blanking holes extend along the die plate and the die pad to the lower die base, and a blanking opening is formed on the side wall of the lower die base, and the hole wall of the blanking hole is inclined obliquely downward away from the axis of the die hole, and the inclination angle is 3°-4°, the end of the rough punching pin is clearance-matched with the die hole of the rough punching die, and the clearance range is 0.005-0.01mm, the fine punching pin is clearance-matched with the die hole of the fine punching die, and the clearance range is 0.005-0.01mm, the bottom end of the fine punching pin is chamfered by 0.1~0.15mm, and the diameter of the die hole of the rough punching die is 0.5~0.6mm smaller than the diameter of the die hole of the fine punching die.

[0012] Preferably, a positioning ring is provided at the bottom end of the punch guide insert, the longitudinal section of the positioning ring is a triangle, and the plane where the base of the triangle is located is fixedly connected to the bottom end of the punch guide insert, the shape enclosed by the positioning ring is the same as the shape of the mold core, and the vertical distance in the horizontal direction between the inner edge of the bottom surface of the positioning ring and the outer edge of the mold core at the corresponding positions is 1.5-2.0mm.

[0013] Preferably, the stripper plate back plate and the stripper plate clamping plate are divided into two groups on the left and right, and a punching channel is provided on the concave template directly below the two groups of stripper plate clamping plates on the left and right. The die cores in the blanking die on the punching channel are divided into four groups along the width direction of the punching channel. The two groups of die cores located on the outside and the two groups of die cores located on the inside are arranged opposite to each other, and after punching, the two groups of chain plates located on the outside and the two groups of chain plates located on the inside are meshed with each other.

[0014] Preferably, a misdelivery detection probe is provided on the right side of the rough punching pin or the fine punching pin, the upper end of the misdelivery detection probe is fixedly connected to the stripping plate clamp, and the lower end is opposite to the normal working position of the chain plate punching.

[0015] Preferably, the rough punching pins, fine punching pins, blanking punches, rough punching dies, fine punching dies, and blanking dies are made of tungsten steel, the surfaces of the rough punching pins, fine punching pins, and blanking punches are all titanium-plated, and the surface of the mold core is mirror-polished.

[0016] The beneficial effects of the bright punching device for a toothed chain plate with a thickness greater than 2 mm of the present invention are as follows: during the punching process, the present invention can ensure the chain plate and aperture shape of the toothed chain of this thickness, improve the bright band around the chain plate and the aperture, and cause little damage to the mold, which is beneficial to ensuring the service life of the mold, and can realize fast and efficient mass punching of large-thickness toothed chain plates, especially those with a thickness greater than 2.0 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : A schematic diagram of the front structure of the present invention;

[0018] Figure 2 : Schematic diagram of the chain plate blanking layout of the present invention;

[0019] Figure 3 : Schematic diagram of the blanking punch and the die core of the present invention and the enlarged diagram of point A;

[0020] Figure 4 : Bottom view and side sectional view of the punch guide insert of the present invention;

[0021] Figure 5 : Schematic diagram of the cooperation between the blanking punch and the chain plate positioning pin of the present invention;

[0022] Figure 6 : An enlarged view of the side structure of part 1 of the present invention;

[0023] 1: upper die seat, 2: upper clamping plate backing plate; 3: upper clamping plate, 4: stripper plate backing plate, 5: stripper plate clamping plate, 6: concave die plate, 7: concave die pad, 8: lower die seat, 9: lower pad, 10: chain plate positioning pin, 11: blanking punch, 12: punch guide insert, 13: die frame, 14: blanking die, 15: connecting rod, 16: spring upper fixing plate, 17: ejector spring, 18: spring lower fixing plate, 19: rough punching pin, 20: fine punching pin, 21: rough punching die, 22: fine punching die, 23: blanking channel, 24: positioning ring, 25: rough punching die hole, 26: fine punching die hole, 27: die core station, 28: meshing form, 29: strip steel, 30: through hole, 31: die core. DETAILED DESCRIPTION

[0024] The following description is only 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 in the scope of protection of the present invention.

[0025] like Figure 1As shown, a bright blanking device for a toothed chain plate with a thickness greater than 2 mm comprises, from top to bottom, an upper die base 1, an upper clamping plate back plate 2, an upper clamping plate 3, a stripper plate back plate 4, a stripper plate clamping plate 5, a concave mold plate 6, a concave mold pad 7, a lower die base 8, and a lower pad 9. The upper clamping plate back plate 2, the upper clamping plate 3, the stripper plate back plate 4, the stripper plate clamping plate 5 are bolted to the lower end surface of the upper die base 1 in sequence, the concave mold plate 6 and the concave mold pad 7 are fixedly connected to the upper end surface of the lower die base 8, and the lower die base 8 is fixedly connected to the lower pad 9 by bolts. The upper clamping plate back plate is elastically connected to the upper clamping plate through a spring, and a rough punching die 21, a fine punching die 22 and a plurality of blanking dies 14 are provided in the concave mold plate 6; the rough punching die 21 and the fine punching die 22 are also provided with a plurality of groups of rough punching pins 19 and fine punching pins 20 used in conjunction therewith, and the upper ends of the rough punching pins 19 and the fine punching pins 20 are fixedly connected to the lower end surface of the upper clamping plate back plate 2, and the lower ends of the rough punching pins 19 and the fine punching pins 20 correspond to the concave die holes of the rough punching die 21 and the fine punching die 22 respectively;

[0026] like Figure 1 As shown, the blanking die 14 is arranged in a die frame 13 that penetrates the die plate 6 and extends into the die pad 7, and is fixedly connected to the die frame 13 by bolts. A connecting rod 15 in a vertical direction is also fixedly connected to the outer surface of the bottom end of the blanking die 14. The connecting rod 15 passes through the bottom end of the die frame. An elastic device is also provided below the connecting rod 15. The elastic device includes an upper spring fixing plate 16, a lower spring fixing plate 18, and a top spring 17 arranged between the upper spring fixing plate 16 and the lower spring fixing plate 18. The lower end of the connecting rod 15 is fixedly connected to the upper end surface of the upper spring fixing plate 16. The elastic device is arranged in the lower die seat 8, and the lower end of the lower spring fixing plate 18 is fixedly connected to the lower pad 9.

[0027] like Figure 1As shown, the blanking die 14 is provided with a die core 31, and a blanking positioning component is also provided above the die core 31. The blanking positioning component includes a chain plate positioning pin 10, a blanking punch 11 sleeved on the outer periphery of the chain plate positioning pin 10, and a punch guide insert 12 slidably connected to the blanking punch 11. The punch guide insert 12 is provided with a through hole 30 penetrating the upper and lower end surfaces. The blanking punch 11 is slidably connected to the punch guide insert 12 through the through hole 30. The punch guide insert 12 is connected to the The stripper plate clamping plate 5 is fixedly connected, the chain plate positioning pin 10 is arranged in the blanking punch 11 along the vertical direction, and has a clearance fit with the blanking punch 11, the top of the blanking punch 11 is fixedly connected to the lower end surface of the upper clamping plate back plate 2, the height of the punch guide insert 12 and the bottom end of the chain plate positioning pin 10 is lower than the height of the bottom end of the blanking punch 11, the blanking punch 11 and the die core are used in conjunction with each other, and the blanking punch 11 and the die core have a clearance fit, and the bottom of the blanking die 14 is provided with a discharge hole;

[0028] The clearance between the chain plate positioning pin 10 and the blanking punch 11 is in the range of 0.01-0.012 mm, the clearance between the blanking punch 11 and the blanking die 14 and the die core is in the range of 0.025-0.035 mm, and the diameter of the chain plate positioning pin 10 is 0.01 mm smaller than the diameter of the die hole of the fine blanking groove 22;

[0029] like Figure 1 As shown, the lower ends of the die holes of the rough punching die 21 and the fine punching die 22 are provided with blanking holes, the blanking holes extend along the die plate and the die pad to the lower die seat, and a blanking port is formed on the side wall of the lower die seat, the hole wall of the blanking hole is inclined obliquely downward away from the die hole axis, and the inclination angle is 3°-4°, the end of the rough punching pin 19 is gap-matched with the die hole of the rough punching die 20, and the gap range is 0.005-0.01mm, the fine punching pin 20 is gap-matched with the die hole of the fine punching die 20, and the gap range is 0.005-0.01mm, the bottom end of the fine punching pin 20 is chamfered by 0.1~0.15mm, and the diameter of the die hole of the rough punching die 21 is 0.5~0.6mm smaller than the diameter of the die hole of the fine punching die 22;

[0030] like Figure 1 , Figure 4 As shown, a positioning ring 24 is provided at the bottom end of the punch guide insert 12, the longitudinal section of the positioning ring 24 is a triangle, and the plane where the bottom side of the triangle is located is fixedly connected to the bottom end of the punch guide insert 12, the shape enclosed by the positioning ring is the same as the shape of the mold core, and the vertical distance in the horizontal direction between the inner edge of the bottom surface of the positioning ring and the outer edge of the mold core at the corresponding position is 1.5-2.0mm;

[0031] like Figure 2As shown, the stripper plate back plate 4 and the stripper plate clamping plate 5 are divided into two groups, a blanking channel 23 is provided on the concave mold plate directly below the two groups of stripper plate clamping plates 5, and the die cores in the blanking die on the blanking channel are divided into four groups along the width direction of the blanking channel 23, and the two groups of die cores located on the outside and the two groups of die cores located on the inside are arranged oppositely, and after blanking, the two groups of chain plates located on the outside and the two groups of chain plates located on the inside are meshed with each other;

[0032] A mis-delivery detection probe is provided on the right side of the rough punching pin or the fine punching pin, the upper end of the mis-delivery detection probe is fixedly connected to the stripper plate clamping plate, and the lower end is opposite to the normal station of the chain plate punching;

[0033] The rough punching pins, fine punching pins, blanking punches, rough punching dies, fine punching dies, and blanking dies are made of tungsten steel, the surfaces of the rough punching pins, fine punching pins, and blanking punches are all titanium-plated, and the surface of the mold core is mirror-polished.

[0034] like Figure 1 As shown, in order to solve the problem that the holes of the toothed chain plates with a thickness greater than 2mm are easily deformed during punching, the present invention adopts a process of rough punching and then fine punching in the process of punching holes in the toothed chain plates. First, a small hole 0.5-0.6mm smaller than the target hole diameter is rough punched. When the target hole is finely punched later, the inside of the rough punched hole can leave deformation space for the thin-walled iron filings under fine punching, which can reduce the punching resistance, thereby reducing the deformation tendency of the hole and improving the service life of the mold; in order to solve the brightness problem in the process of punching holes in the toothed chain plates, the fine punching rivet 20 of the present invention is matched with the clearance of the die hole of the fine punching die 20, and the clearance range is 0.005-0.01mm, and the bottom end of the fine punching rivet 20 is chamfered by 0.1~0.15mm. Since the chamfer improves the plastic flow direction of the steel plate material when punching the steel plate, it can significantly promote the improvement of the punching bright band.

[0035] like Figure 1 As shown, in order to solve the problem of chain plate deformation during blanking of toothed chain plates with a thickness greater than 2 mm, the present invention provides a punch guide insert 12 and a chain plate positioning pin 10 to strongly position the chain plate. Specifically, when the mold is closed, the chain plate positioning pin 10 first extends into the finely punched hole to strongly position the hole, and then the punch guide insert 12 is pressed down to strongly position the strip steel material. The blanking punch 11 squeezes the strip steel into the die core of the blanking die 14, and the strip steel is blanked into a steel sheet in the shape of the die core, as shown in FIG. Figure 4As shown, since the positioning ring of the punch guide insert 12 will press the strip steel in when it contacts the strip steel, the strip steel around the blanking die core will not be shifted, and the chain plate positioning pins penetrate into the chain plate holes. Since the chain plate positioning pins are only about 0.01mm smaller than the hole diameter, the hole deformation margin is extremely small, which ensures that the deformation of the chain plate hole and the hole wall is extremely small, thereby ensuring the shape of the chain plate.

[0036] Further, such as Figure 5 As shown, the gap between the chain plate positioning pin 10 and the blanking punch 11 is in the range of 0.01-0.012 mm. This design can ensure the precise positioning of the chain plate hole during blanking, and is conducive to the repair of the mold, which can extend the service life of the mold;

[0037] Further, such as Figure 3 As shown, the gap between the blanking punch and the blanking die 14 and the die core is in the range of 0.025-0.035 mm, which can ensure that the entire periphery of the chain plate is blanked and bright.

[0038] Further, such as Figure 1 , Figure 2 As shown in the figure, the chain plates are meshed with each other during blanking, which reduces the displacement tendency of the strip during the blanking process.

[0039] Further, such as Figure 1 , Figure 2 As shown, the punched chain plates are delivered in a meshing form, thus avoiding displacement during the conveying process.

[0040] Furthermore, a mis-delivery detection probe is provided on the right side of the rough punching pin 19 or the fine punching pin 20. When the punching is out of the normal workstation, the mis-delivery detection probe detects the position abnormality and sends a stop signal to the stamping equipment, thereby protecting the mold.

[0041] Based on the above description, if Figure 1 , Figure 2 As shown, when the present invention is used, the strip steel enters from the left side along the punching channel on the upper surface of the concave plate 6, the mold is closed, the stripping plate 5 is close to the concave plate 6, the rough punching pin 19 first performs rough punching and punching on the strip steel, and the fine punching pin 20 punches the punching hole position for the second time, and the strip steel continues to move forward. When it reaches the blanking die 14, the chain plate positioning pin 10 first extends into the finely punched hole to strongly position the hole, and then the punch guide insert 12 contacts the strip steel to strongly position the strip steel material. At this time, the spring between the upper clamp and the upper clamp back plate is compressed, and the blanking punch 11 continues to press down and squeeze the strip steel into the die core of the die 14, and the strip steel is punched into a steel sheet in the shape of the die core of the die. Multiple groups of punched chain plates are output through the punching channel in a mutually meshing manner.

Claims

1. A bright blanking device for a toothed chain plate with a thickness greater than 2 mm, which comprises, from top to bottom, an upper die seat, an upper clamping plate back plate, an upper clamping plate, a stripper plate back plate, a stripper plate clamping plate, a concave mold plate, a concave mold pad, a lower die seat, and a lower pad, wherein the upper clamping plate back plate, the upper clamping plate, the stripper plate back plate, the stripper plate clamping plate and the lower end surface of the upper die seat are bolted in sequence, the concave mold plate and the concave mold pad are fixedly connected to the upper end surface of the lower die seat, the lower die seat is fixedly connected to the lower pad by bolts, and the upper clamping plate back plate is elastically connected to the upper clamping plate by a spring, and is characterized by: The described concave template is provided with a rough punching die, a fine punching die and a plurality of blanking dies; the described rough punching die and the fine punching die are also provided with a plurality of groups of rough punching pins and fine punching pins used therewith, the upper ends of the described rough punching pins and the fine punching pins are fixedly connected to the lower end surface of the upper splint back plate, and the lower ends of the described rough punching pins and the fine punching pins correspond to the die holes of the rough punching die and the fine punching die respectively; the described blanking die is provided with a die core, and a blanking positioning component is also provided above the described die core, and the described blanking positioning component includes a chain plate positioning A positioning nail, a blanking punch sleeved on the outer periphery of the chain plate positioning nail, and a punch guide insert slidably connected to the blanking punch, the punch guide insert is provided with a through hole penetrating the upper and lower end surfaces, the blanking punch is slidably connected to the punch guide insert through the through hole, the punch guide insert is fixedly connected to the stripping plate clamp, the chain plate positioning nail is arranged in the blanking punch along the vertical direction and cooperates with the blanking punch gap, the top end of the blanking punch is fixedly connected to the lower end surface of the upper clamp back plate, the punch guide insert and the chain plate positioning nail The height of the bottom end of the positioning pin is lower than the height of the bottom end of the blanking punch. The blanking punch and the die core are used in conjunction with each other, and the blanking punch and the die core are clearance-matched. A discharge hole is provided at the bottom of the blanking die. A positioning ring is provided at the bottom end of the punch guide insert. The longitudinal section of the positioning ring is a triangle, and the plane where the bottom side of the triangle is located is fixedly connected to the bottom end of the punch guide insert. The shape enclosed by the positioning ring is the same as the shape of the die core, and the corresponding position between the inner edge of the bottom surface of the positioning ring and the outer edge of the die core is The vertical distance in the horizontal direction is 1.5-2.0mm; the stripper plate back plate and the stripper plate clamping plate are divided into two groups, a blanking channel is provided on the concave template directly below the two groups of stripper plate clamping plates, and the mold cores in the blanking die on the blanking channel are divided into four groups along the width direction of the blanking channel, the two groups of mold cores located on the outside and the two groups of mold cores located on the inside are arranged opposite to each other, and after blanking, the two groups of chain plates located on the outside and the two groups of chain plates located on the inside are meshed with each other, and the surface of the mold core is mirror polished.

2. A bright blanking device for toothed chain plates with a thickness greater than 2 mm as claimed in claim 1, characterized in that: The blanking die is arranged in a die frame that penetrates the die template and extends into the die pad, and is fixedly connected to the die frame by bolts. A connecting rod in a vertical direction is also fixedly connected to the outer surface of the bottom end of the blanking die. The connecting rod passes through the bottom end of the die frame. An elastic device is also provided below the connecting rod. The elastic device includes an upper spring fixing plate, a lower spring fixing plate, and a top spring arranged between the upper spring fixing plate and the lower spring fixing plate. The lower end of the connecting rod is fixedly connected to the upper end surface of the upper spring fixing plate. The elastic device is arranged in the lower die seat, and the lower end of the lower spring fixing plate is fixedly connected to the lower pad.

3. A bright punching device for toothed chain plates with a thickness greater than 2 mm as claimed in claim 2, characterized in that: The clearance between the chain plate positioning pin and the blanking punch is in the range of 0.01-0.012 mm, and the diameter of the chain plate positioning pin is 0.01 mm smaller than the diameter of the die hole of the fine blanking die.

4. A bright punching device for toothed chain plates with a thickness greater than 2 mm as claimed in claim 3, characterized in that: A blanking hole is provided at the lower end of the die hole of the rough punching die and the fine punching die, and the blanking hole extends along the die plate and the die pad to the lower die base, and forms a blanking opening on the side wall of the lower die base. The hole wall of the blanking hole is inclined obliquely downward away from the axis of the die hole, and the inclination angle is 3°-4°. The end of the rough punching pin is clearance-matched with the die hole of the rough punching die, and the clearance range is 0.005-0.01mm. The fine punching pin is clearance-matched with the die hole of the fine punching die, and the clearance range is 0.005-0.01mm. The bottom end chamfer of the fine punching pin is 0.1~0.15mm, and the diameter of the die hole of the rough punching die is 0.5~0.6mm smaller than the diameter of the die hole of the fine punching die.

5. A bright punching device for toothed chain plates with a thickness greater than 2 mm as claimed in claim 4, characterized in that: A misdelivery detection probe is provided on the right side of the rough punching pin or the fine punching pin, the upper end of the misdelivery detection probe is fixedly connected to the stripping plate clamping plate, and the lower end is opposite to the normal working position of the chain plate punching.

6. A bright punching device for toothed chain plates with a thickness greater than 2 mm as claimed in claim 5, characterized in that: The rough punching pins, fine punching pins, blanking punches, rough punching dies, fine punching dies, and blanking dies are made of tungsten steel, and the surfaces of the rough punching pins, fine punching pins, and blanking punches are all titanium-plated.

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