Broken-filament-free die cutting production process of hard PC material small-size product and die cutting knife die of hard PC material small-size product

Abstract

The invention relates to a broken filament-free die cutting production process of a hard PC material small-size product. The broken filament-free die cutting production process comprises the following steps: step a, firstly, compounding a silica gel protective film with the specification of 300-500G on the smooth surface of a PC raw material; b, a hardened high-speed steel waste suction cutting die is adopted for punching, one face of a cutting edge of the hardened high-speed steel waste suction cutting die is a straight face, the other face of the cutting edge of the hardened high-speed steel waste suction cutting die is an inclined face, the straight face makes contact with a PC product, the inclined face makes contact with PC waste, the included angle between the straight face and the longitudinal base face is 0-5 degrees, and the included angle between the inclined face and the longitudinal base face is 40-50 degrees; and after punching, removing PC waste outside the frame to obtain a broken filament-free PC product. According to the technology and the specially-designed die cutting die, the original working procedure needing two sets of die dies and two times of punching is replaced by one set of die dies for one time of die cutting, the product precision is improved, the parameters such as the blade angle and the hardness of the die dies are improved, uniform pressure between the manufactured product and outer frame waste is made as much as possible, stable die cutting is achieved, and the production efficiency is improved. And the phenomenon of broken filaments or sawtooth edges of the PC product is avoided.

Description

Technical Field

[0001] This invention relates to the field of precision die-cutting component manufacturing technology, specifically to a burr-free die-cutting process for small-sized products made of rigid PC material and its die-cutting die. Background Technology

[0002] Precision electronic products such as mobile phones, tablets, and headphones sometimes require small-sized rigid PC (plastic) components with dimensions less than 10 mm in length and width and a thickness less than 1 mm. For die-cutting these products using traditional metal die-cutting molds, a two-stage die-cutting process is typically required. Based on the layout of the PC product on the raw material, the first die-cut removes most of the PC waste around the perimeter of the larger piece, retaining only a slightly larger area of ​​semi-finished PC. The second die-cut then cuts the finished PC product from this semi-finished area. For some rigid PC products, this process can reduce defects such as burrs and serrations to some extent. However, due to the potential for dimensional errors caused by the two-stage die-cutting alignment, the overall product yield remains low. Furthermore, some customers specify PC materials with high hardness and toughness, making them prone to chipping when die-cut using ordinary metal tools. This still easily leads to burrs and serrations on the product edges, requiring further improvement. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a burr-free die-cutting production process for small-sized products made of rigid PC material and its die-cutting die.

[0004] The technical solution adopted in this invention is: a lint-free die-cutting production process for small-sized products made of rigid PC material, which includes the following steps: Step a: First, laminate a silicone protective film with a specification of 300-500G onto the smooth surface of the PC raw material; Step b involves punching with a hardened high-speed steel waste-absorbing die. The die has a straight blade on one side and an inclined blade on the other. The straight blade contacts the PC product, while the inclined blade contacts the PC waste. The angle between the straight blade and the longitudinal base plane is 0°-5°, and the angle between the inclined blade and the longitudinal base plane is 40°-50°. After punching, the PC waste outside the frame is removed to obtain a lint-free PC product.

[0005] The die-cutting template of the hardened high-speed steel waste-absorbing die is located on the lower die assembly, with the blade facing upwards. The silicone protective film faces upwards and the PC raw material faces downwards for punching. The blade's entry depth is just enough to cut through the PC raw material without cutting through the silicone protective film. An inner cavity is formed within the blade frame of the die-cutting template for the PC products to stack and pass through. After die-cutting is completed, the PC products in the frame are pushed off by the ejection mechanism in the upper die assembly, separated from the silicone protective film, and fall into the inner cavity for collection.

[0006] The hardened high-speed steel waste suction die has a cutting edge hardness of HRC 65 or higher.

[0007] This production process is suitable for die-cutting PC products with length and width dimensions less than 10 mm and thickness greater than 0.5 mm.

[0008] This invention also provides a burr-free die-cutting die for small-sized products made of rigid PC material, including a die body. The die body is a hardened high-speed steel waste-absorbing die with an array of closed blades. The inner blade surface of the closed blade is a straight surface, and the outer blade surface is an inclined surface. The straight surface contacts the PC product, and the inclined surface contacts the PC waste. The angle between the inner blade surface and the longitudinal base plane is 0°-5°, and the angle between the inclined surface and the longitudinal base plane is 40°-50°. An inner cavity is formed inside the inner blade surface for the PC products to be stacked and passed through. An ejection mechanism corresponding to the position of the closed blades is provided on the die opposite to the die.

[0009] The closed cutting edge is divided into two groups of three, which are staggered to facilitate the processing of the die and the waste removal operation.

[0010] This invention, through the above-mentioned process and a specially designed die-cutting die, replaces the original process requiring two sets of dies and two punching operations with a single die for one die-cutting operation. This reduces process tolerances caused by misalignment, improving product precision. Furthermore, it further improves parameters such as blade angle and die hardness, maximizing the pressure between the product and the outer frame waste to achieve stable die-cutting and avoid burrs or serrated edges on PC products. It is especially suitable for die-cutting rigid, thick, small-sized PC products. Attached Figure Description

[0011] Figure 1 , Figure 2 This is a schematic diagram of the die-cutting die and the die-cutting effect in the process of this invention; Figure 3 , Figure 4 These are a plan view and a cross-sectional view of a die-cutting die according to an embodiment of the present invention; Detailed Implementation

[0012] like Figures 1-4 As shown, the present invention describes a lint-free die-cutting process for small-sized rigid PC material products. This die-cutting process includes the following steps: Step a, first laminate a silicone protective film 2 with a specification of 300-500G onto the smooth surface of PC raw material 1; Step b involves punching with a hardened high-speed steel waste-absorbing die. The die has a straight surface 301 on one side and an inclined surface 302 on the other. The straight surface 301 contacts the PC product, while the inclined surface 302 contacts the PC waste. The angle between the straight surface 301 and the longitudinal base plane is 0°-5°, and the angle between the inclined surface 302 and the longitudinal base plane is 40°-50°. After punching, the PC waste outside the frame is removed to obtain a lint-free PC product.

[0013] By using a die made of hardened high-speed steel, a large angle of inclination, and a waste removal process during die cutting, we strive to create maximum pressure between the PC product and the outer frame waste. This ensures that the vertical shearing force per unit area along the entire cutting contour is infinitely consistent, achieving stable die cutting, avoiding fuzzy or jagged edges on the PC product, and improving the product qualification rate.

[0014] The die-cutting template of the hardened high-speed steel waste-absorbing die is located on the lower die assembly, with the blade facing upwards. The silicone protective film faces upwards and the PC raw material faces downwards for punching (i.e., the blade is below and the material is above). The blade's entry depth is just enough to cut through the PC raw material without cutting through the silicone protective film. An inner cavity is formed within the blade frame of the die-cutting template for the PC products to stack and pass through. After die-cutting is completed, the PC products in the frame are pushed off by the ejection mechanism in the upper die assembly (such as using a spring, polyurethane (PU) glue rod, or pneumatic ejector pin) and separated from the silicone protective film, falling into the inner cavity and being collected. The hardened high-speed steel waste suction die has a cutting edge hardness of HRC 65 or higher.

[0015] This production process is suitable for die-cutting PC products with length and width dimensions less than 10 mm and thickness greater than 0.5 mm.

[0016] This invention also provides a burr-free die-cutting die for small-sized products made of rigid PC material, including a die body 4. The die body 4 is a hardened high-speed steel waste-absorbing die, which has an array of closed blades 41. The inner blade surface of the closed blade 41 is a straight surface, and the outer blade surface is an inclined surface. The straight surface contacts the PC product, and the inclined surface contacts the PC waste. The angle between the inner blade surface and the longitudinal base plane is 0°-5°, and the angle between the inclined surface and the longitudinal base plane is 40°-50°. An inner cavity 42 is formed inside the inner blade surface for the PC products to be stacked and passed through. The die opposite to the die is provided with an ejection mechanism (not shown in the figure) corresponding to the position of the closed blades 41.

[0017] The closed cutting edge 41 is divided into two groups of three, which are staggered to facilitate the processing of the die and the waste removal operation.

[0018] This invention, through the above-mentioned process and a specially designed die-cutting die, replaces the original process requiring two sets of dies and two punching operations with a single die for one die-cutting operation. This reduces process tolerances caused by misalignment, improving product precision. Furthermore, it further improves parameters such as blade angle and die hardness, maximizing the pressure between the product and the outer frame waste to achieve stable die-cutting and avoid burrs or serrated edges on PC products. It is especially suitable for die-cutting rigid, thick, small-sized PC products.

[0019] The above embodiments are merely exemplary implementations used to illustrate the principles of the present invention; however, the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A lint-free die-cutting process for small-sized rigid PC material products, characterized in that: The die-cutting production process includes the following steps: Step a: First, laminate a silicone protective film with a specification of 300-500G onto the smooth surface of the PC raw material; Step b involves punching with a hardened high-speed steel waste-absorbing die. The die has a straight blade on one side and an inclined blade on the other. The straight blade contacts the PC product, while the inclined blade contacts the PC waste. The angle between the straight blade and the longitudinal base plane is 0°-5°, and the angle between the inclined blade and the longitudinal base plane is 40°-50°. After punching, the PC waste outside the frame is removed to obtain a lint-free PC product.

2. The burr-free die-cutting production process for small-sized rigid PC material products according to claim 1, characterized in that: The die-cutting template of the hardened high-speed steel waste-absorbing die is located on the lower die assembly, with the blade facing upwards. The silicone protective film faces upwards and the PC raw material faces downwards for punching. The blade's entry depth is just enough to cut through the PC raw material without cutting through the silicone protective film. An inner cavity is formed within the blade frame of the die-cutting template for the PC products to stack and pass through. After die-cutting is completed, the PC products in the frame are pushed off by the ejection mechanism in the upper die assembly, separated from the silicone protective film, and fall into the inner cavity for collection.

3. The burr-free die-cutting production process for small-sized rigid PC material products according to claim 1, characterized in that: The hardened high-speed steel waste suction die has a cutting edge hardness of HRC 65 or higher.

4. The lint-free die-cutting production process for small-sized rigid PC material products according to claim 1, characterized in that: This production process is suitable for die-cutting PC products with length and width dimensions less than 10 mm and thickness greater than 0.5 mm.

5. A burr-free die-cutting die for small-sized products made of rigid PC material, comprising a die body, characterized in that: The main body of the die-cutting mold is a hardened high-speed steel waste-absorbing die-cutting mold. The die-cutting mold has an array of closed cutting edges. The inner cutting edge of the closed cutting edge is a straight surface, and the outer cutting edge is an inclined surface. The straight surface contacts the PC product, and the inclined surface contacts the PC waste. The angle between the inner cutting edge and the longitudinal base plane is 0°-5°, and the angle between the inclined surface and the longitudinal base plane is 40°-50°. The inner cutting edge forms an inner cavity for the PC products to be stacked and passed through. The die-pressing mold opposite to the die-cutting mold is equipped with an ejection mechanism corresponding to the position of the closed cutting edge.

6. The burr-free die-cutting mold for small-sized products made of rigid PC material according to claim 5, characterized in that: The closed blades are divided into two groups of three, with adjacent closed blades arranged in a staggered manner.

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