A small hole waste ejector pin type straight discharge structure of a die cutting machine

Abstract

The application provides a die cutting machine small hole waste ejector pin type straight discharge structure, which can prevent die from breaking when small holes are cut and ensure efficient and complete small hole waste discharge. The structure comprises a die, a bottom plate and a small hole punching position and a small hole waste discharge position are arranged on the die, the small hole punching position is arranged with a profiled closed blade corresponding to the designed small hole position, the small hole waste discharge position is arranged with a lower convex ejector pin with a retracted edge corresponding to the position of the small hole; and the bottom plate is located directly below the die, the length of the bottom plate is not less than the length area covered by the small hole punching position and the small hole waste discharge position of the die, no waste discharge hole is arranged on the bottom plate corresponding to the position directly below the small hole punching position, the bottom plate is arranged with a material falling area corresponding to the small hole waste discharge position, the material falling area comprises a material falling hole arranged corresponding to each lower convex ejector pin, the material falling hole is a funnel-shaped structure with a small upper part and a large lower part, and the inlet of each material falling hole is profiled to the shape of the corresponding hole waste.

Description

Technical Field

[0001] This invention relates to the technical field of die-cutting processing, specifically to a die-cutting machine small hole waste ejector pin type straight discharge structure. Background Technology

[0002] In die-cutting, a large number of die-cut parts for electronic products such as mobile phones, tablets, and smart wearables (e.g., protective films, double-sided tape, foam, dustproof mesh, etc.) need to be punched with round or irregularly shaped small holes for clearance or positioning of components such as cameras, speakers, and sensors. These small holes typically have a diameter between 1 and 5 mm and are considered micro-hole waste. During die-cutting, the blade cuts through the material, creating this micro-hole waste. After this micro-hole waste separates from the product body, it faces the following problems: (1) Scrap material stuck in the die. After the small-hole waste is cut off, it often gets stuck in the annular space formed by the die blades. Because the cutting line is a closed ring, the waste cannot fall off by itself and needs to be manually removed one by one with ejector pins or tweezers, which is extremely inefficient.

[0003] (2) Waste accumulation leads to blade breakage When waste is not removed in time, it will be trapped between the blade and the material during the next punching cut. Small-hole waste may be small in size but have high hardness (such as PET, PC, etc.). The accumulated waste forms local hard spots during punching, which directly impact the cutting edge, resulting in: chipping and nicking of the cutting edge, scrapping of the die, indentation and damage to the product, and a decrease in yield.

[0004] (3) Existing ejector pin waste disposal The die is equipped with ejector pins to push out the waste material during punching. However, in the existing technology, the ejector pins are flat or round, and the contact surface is too flat or too smooth. Especially for hard materials, the ejector pin will slip and deviate when pressed, and the waste material may be pushed off course and get stuck in the blanking hole. In addition, the blanking hole of the base plate is also straight without any angle, so the waste material will still get stuck inside the hole. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a die-cutting machine waste ejector pin-type straight discharge structure, which prevents the die from chipping during die-cutting of small holes while ensuring efficient and thorough waste discharge from the small holes.

[0006] A die-cutting machine small hole waste ejector pin type straight discharge structure, characterized in that it comprises: The die-cutting mold has a small hole punching position and a small hole waste removal position. The small hole punching position is equipped with a closed cutting edge that conforms to the designed small hole position. The small hole waste removal position is equipped with a downwardly protruding ejector pin with an inwardly tapered edge corresponding to the position of the small hole. And the base plate; The base plate is located directly below the die, and the length of the base plate is not less than the length area covered by the small hole punching position and the small hole waste discharge position of the die. The base plate does not have a waste discharge hole directly below the small hole punching position, and the base plate has a blanking area corresponding to the small hole waste discharge position. The blanking area includes a blanking hole corresponding to each lower convex ejector pin. The blanking hole has a funnel-shaped structure that is smaller at the top and larger at the bottom, and the inlet of each blanking hole is shaped to resemble the shape of the corresponding hole waste.

[0007] Its further features are: Each lower convex ejector pin on the waste discharge position of the die-cutting mold is the central lower convex ejector pin corresponding to each waste hole; Preferably, the bottom of the lower convex ejector pin is plum blossom shaped, and the bottom of the lower convex ejector pin has 3 to 6 protruding petals, so that the contact area between the lower convex ejector pin and the waste hole is small and the pressure is concentrated. Moreover, due to the scattered protruding petals, the waste discharge does not slip or deviate. The material feeding area is divided into an upper material feeding hole area and a lower buffer cavity. The upper material feeding hole area consists of individual material feeding holes, and the lower buffer cavity is an integral cavity, with the surface area of ​​the lower buffer cavity covering all material feeding holes. The equivalent diameter of the lower convex ejector pin is 0.1~0.2mm smaller than the equivalent diameter of the waste hole, ensuring that the lower convex ejector pin can be inserted into the small hole without scratching the hole wall. The lower convex ejector pin must ensure that the waste hole is completely ejected and passes through the corresponding discharge hole. The surface of the lower convex ejector pin is coated with an anti-adhesion layer to ensure that the lower convex ejector pin will not stick to the hole waste. The concentricity of each of the lower convex ejector pins with the corresponding material drop hole below is ≤0.1mm, ensuring that the lower convex ejector pins are accurately inserted into the material drop hole; The die-cutting mold has corresponding guide pins on both sides in the width direction, and the base plate has guide holes on both sides in the width direction corresponding to the positions of the guide pins, to ensure that the die-cutting mold can reliably perform waste removal operations on the base plate. The height of the lower convex ejector pin is 0.1mm to 2mm greater than the height of the corresponding discharge hole, which ensures that the waste from the hole is fed into the lower buffer cavity. The lower buffer cavity means that the height of the lower convex ejector pin does not need to be higher than the height of the entire base plate, thus saving material costs. Preferably, the lower buffer cavity is connected to the waste discharge channel, and timely cleaning of the waste discharge channel ensures that waste does not accumulate in the lower buffer cavity.

[0008] The operation of this invention is as follows: 1. Punching stage: The material first enters the small hole punching position of the die. The closed blade of the small hole punching position punches out of the small hole. After the scrap is cut by the blade, it temporarily stays in the small hole on the material (the scrap and the material have been separated, but have not fallen off). 2. Material transfer: The material continues to move forward, transferring the small hole containing waste material to the waste discharge position of the small hole; 3. Pre-ejection stage: When the small hole reaches directly below the lower ejector pin, the upper mold moves downward, and the ejector pin in the figure below inserts into the small hole from above, pushing the hole waste downward; 4. Straight discharge stage: After the waste material is pushed out by the lower convex ejector pin, it falls directly into the discharge hole on the base plate; 5. Collection stage: After the waste material passes through the discharge hole, it enters the collection box through the collection channel; It prevents the die from chipping when cutting small holes, while ensuring efficient and thorough waste removal from the small holes. Attached Figure Description

[0009] Figure 1 This is a plan view of the die-cutting mold of the present invention; Figure 2 This is a top view of the base plate of the present invention; Figure 3 for Figure 2 A sectional view; Figure 4 This is a schematic diagram of the bottom shape of the convex ejector pin of the present invention; The names corresponding to the serial numbers in the diagram are as follows: Die 10, guide pin 11, small hole punching position 20, small hole waste discharge position 30, closed blade 21, lower convex ejector pin 31, convex petal 311, base plate 40, blanking hole 41, lower buffer cavity 42, guide hole 43. Detailed Implementation

[0010] A die-cutting machine small hole waste ejector pin type straight discharge structure, see Figures 1-4 It includes a die-cutting mold 10 and a base plate 40; The die 10 has small hole punching positions 20 and small hole waste removal positions 30 arranged sequentially along the length direction. The small hole punching positions 20 are equipped with contoured closed blades 21 corresponding to the designed small hole positions. The small hole waste removal positions 30 are equipped with inwardly recessed lower convex ejector pins 31 corresponding to the small hole positions. The base plate 40 is located directly below the die 10. The length of the base plate 40 is not less than the length of the area covered by the small hole punching position 20 and the small hole waste discharge position 30 of the die 10. No waste discharge hole is provided directly below the small hole punching position 20 on the base plate 40. A material discharge area is provided on the base plate 40 corresponding to the small hole waste discharge position 30. The material discharge area includes a material discharge hole 41 provided for each lower convex ejector pin 31. The material discharge hole 41 is a funnel-shaped structure with a smaller top and a larger bottom. The inlet of each material discharge hole 41 is set to mimic the shape of the corresponding hole waste.

[0011] In specific implementation, each convex ejector pin 31 on the small hole waste discharge position 30 of the die 10 is a convex ejector pin set at the center position of each hole waste; The bottom of the lower convex ejector pin 31 is plum blossom shaped, and the bottom of the lower convex ejector pin has 3 to 6 protruding petals 311, which makes the contact area between the lower convex ejector pin 31 and the waste hole small and the pressure concentrated. Furthermore, due to the scattered protruding petals 311, the waste discharge does not slip or deviate.

[0012] In a specific embodiment, the material dropping area is divided into an upper material dropping hole area and a lower buffer cavity 42. The upper material dropping hole area consists of individual material dropping holes 41, and the lower buffer cavity 42 is an integral cavity, and the surface area of ​​the lower buffer cavity 42 covers the material dropping openings of all material dropping holes 41. The equivalent diameter of the lower convex ejector pin 31 is 0.1~0.2mm smaller than the equivalent diameter of the waste hole, ensuring that the lower convex ejector pin 31 can be inserted into the small hole without scratching the hole wall. The lower convex ejector pin 31 must ensure that the waste hole is completely ejected and passes through the corresponding discharge hole. The surface of the lower convex ejector pin 31 is coated with an anti-adhesion layer to ensure that the lower convex ejector pin will not stick to the hole waste; The concentricity of each lower convex ejector pin 31 with the corresponding lower discharge hole 41 is ≤0.1mm, ensuring that the lower convex ejector pin 31 is accurately inserted into the discharge hole 41; The die 10 has corresponding guide pins 11 on both sides of its width direction, and the base plate 40 has guide holes 43 on both sides of its width direction corresponding to the positions of the guide pins 11, to ensure that the die 10 can reliably perform waste removal operation on the base plate 40. The height of the lower convex ejector pin 31 is 0.1mm to 2mm greater than the height of the corresponding discharge hole 41, which ensures that the waste from the hole is fed into the lower buffer cavity 42. The setting of the lower buffer cavity 42 means that the height of the lower convex ejector pin 31 does not need to be higher than the height of the entire base plate 10, thus saving material costs.

[0013] In practice, the lower buffer cavity 42 is connected to the waste discharge channel, and the waste discharge channel is cleaned in a timely manner to ensure that the waste in the lower buffer cavity 42 does not accumulate.

[0014] The operation of this invention is as follows: 1. Punching stage: The material first enters the small hole punching position of the die. The closed blade of the small hole punching position punches out of the small hole. After the scrap is cut by the blade, it temporarily stays in the small hole on the material (the scrap and the material have been separated, but have not fallen off). 2. Material transfer: The material continues to move forward, transferring the small hole containing waste material to the waste discharge position of the small hole; 3. Pre-ejection stage: When the small hole reaches directly below the lower ejector pin, the upper mold moves downward, and the ejector pin in the figure below inserts into the small hole from above, pushing the hole waste downward; 4. Straight discharge stage: After the waste material is pushed out by the lower convex ejector pin, it falls directly into the discharge hole on the base plate; 5. Collection stage: After the waste material passes through the discharge hole, it enters the collection box through the collection channel; The process of punching first and then ejecting is coordinated. The die-cutting edge only punches holes and does not remove waste, while the lower ejector pin only removes waste and does not punch holes. The two processes are separated in space and coordinated sequentially in time without interfering with each other. Furthermore, the concentric fit between the ejector pin and the blanking hole ensures that the coaxiality between the center of the ejector pin and the center of the blanking hole is ≤0.1mm, which ensures that the ejector pin accurately pushes the waste into the blanking hole. In addition, the bottom of the lower ejector pin is a plum blossom-shaped ejector pin instead of a flat or conical ejector pin, which ensures that the waste in the hole will not slip out, and the funnel-shaped blanking hole ensures that the waste in the hole will not get stuck in it.

[0015] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0016] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A die-cutting machine small hole waste ejector pin type straight discharge structure, characterized in that, It includes: The die-cutting mold has a small hole punching position and a small hole waste removal position. The small hole punching position is equipped with a closed cutting edge that conforms to the designed small hole position. The small hole waste removal position is equipped with a downwardly protruding ejector pin with an inwardly tapered edge corresponding to the position of the small hole. And the base plate; The base plate is located directly below the die, and the length of the base plate is not less than the length area covered by the small hole punching position and the small hole waste discharge position of the die. The base plate does not have a waste discharge hole directly below the small hole punching position, and the base plate has a blanking area corresponding to the small hole waste discharge position. The blanking area includes a blanking hole corresponding to each lower convex ejector pin. The blanking hole has a funnel-shaped structure that is smaller at the top and larger at the bottom, and the inlet of each blanking hole is shaped to resemble the shape of the corresponding hole waste.

2. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: Each convex ejector pin on the waste removal position of the die-cutting mold is the central convex ejector pin corresponding to each waste hole.

3. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 2, characterized in that: The bottom of the convex pin is plum blossom shaped, and the bottom of the convex pin has 3 to 6 protruding petals.

4. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: The material discharge area is divided into an upper material discharge hole area and a lower buffer cavity. The upper material discharge hole area consists of individual material discharge holes, and the lower buffer cavity is an integral cavity, with the surface area of ​​the lower buffer cavity covering all material discharge holes.

5. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: The equivalent diameter of the lower convex ejector pin is 0.1~0.2mm smaller than the equivalent diameter of the hole waste, ensuring that the lower convex ejector pin can be inserted into the small hole without scratching the hole wall.

6. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: The surface of the lower convex pin is coated with an anti-adhesion layer.

7. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: The concentricity of each of the lower convex ejector pins and the corresponding material drop hole below them is ≤0.1mm.

8. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: The die-cutting mold has corresponding guide pins on both sides in the width direction, and the base plate has guide holes on both sides in the width direction corresponding to the positions of the guide pins.

9. The die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 1, characterized in that: The height of the lower convex ejector pin is 0.1mm to 2mm greater than the height of the corresponding material drop hole.

10. A die-cutting machine small hole waste ejector pin type straight discharge structure according to claim 4, characterized in that: The lower-level buffer cavity is connected to the waste discharge channel.

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