A die-cutting tool for preventing deformation of foam products

Abstract

The present invention relates to a punching tool for preventing the deformation of foam products, which comprises a tool body and a groove-shaped cutting edge arranged at the bottom of the tool body. The side wall of the groove-shaped cutting edge is an arc-shaped side wall that bends inward. During the punching process, the raw material is uniformly squeezed inward by the arc-shaped side wall. After leaving the punching tool, a foam product with regular shape is obtained through the rebound effect of the foam material. Compared with the prior art, the structure of the present invention is simple, the improvement degree of the device is small, the effect is remarkable, and it is applicable to the punching work of foam materials with different shapes and specifications, having a relatively wide scope of application.

Description

Technical Field

[0001] The present invention belongs to the technical field of die cutting, and relates to a punching tool for avoiding deformation of foam products. Background Art

[0002] The foam film is made of EVA or PE foam as the base material, with a solvent-based (or hot-melt) pressure-sensitive adhesive coated on one or both sides and then laminated with release paper. It has the functions of sealing and shock absorption, and has excellent sealing performance, compression set resistance, flame retardancy, wettability, etc. The products are widely used in electronic and electrical products, mechanical parts, various small household appliances, mobile phone accessories, industrial instruments, computers and peripheral equipment, automotive accessories, audio and video equipment, toys, cosmetics, etc. Due to the soft and easily deformable characteristics of the foam, in the current die-cutting devices on the market, when die-cutting the foam, it is easy for the foam to be deformed under pressure, resulting in irregular deformation around the foam products after punching, thus affecting the product quality. Summary of the Invention

[0003] The purpose of the present invention is to provide a punching tool for avoiding deformation of foam products, which is used to solve the problem of edge deformation of foam products after punching.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A punching tool for avoiding deformation of foam products, comprising a tool body and a groove-shaped cutting edge provided at the bottom of the tool body, wherein the side wall of the groove-shaped cutting edge is an arc-shaped side wall that bends inward;

[0006] Due to the arc-shaped side wall, the raw material is uniformly squeezed inward during the punching process. After leaving the punching tool, through the elastic recovery of the foam material, a foam product with regular shape can be obtained.

[0007] Further, the edge of the longitudinal section of the arc-shaped side wall is a smooth arc.

[0008] Further, the two opposite arc-shaped side walls are symmetrically arranged.

[0009] Further, the vertex of the edge of the longitudinal section of the arc-shaped side wall is located at the center of the edge.

[0010] Further, the vertices of the edges of the longitudinal sections of multiple arc-shaped side walls are located in the same horizontal plane.

[0011] Further, the ratio of the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall to the depth of the groove-shaped cutting edge is (5 - 8):10, preferably (6 - 7):10, and more preferably 6.4:10.

[0012] Further, the depth of the groove-shaped cutting edge is 8 - 12 mm, preferably 10 mm.

[0013] Compared with the prior art, the present invention has the following characteristics:

[0014] 1) Usually, the side wall of the cutting edge in a punching tool is a straight side wall. During punching, there is an extrusion effect between the side wall and the foam material. Due to the differences in shape and structure and the uneven density of the foam everywhere, the extrusion forces, extrusion directions, and extrusion deformations received by different parts of the side wall of the foam product are different. As a result, after the punching tool is separated, the rebound effects of different parts of the side wall of the foam product are inconsistent, and overall, irregular deformations occur, affecting the product quality. However, through the setting of the arc-shaped side wall in this punching tool, during the punching process, an inward extrusion effect is uniformly applied to the periphery of the foam, forcing the same extrusion deformation to occur around the product. As a result, the rebound effect of the final foam product tends to be consistent, ensuring the regularity of the product shape;

[0015] 2) The structure of the present invention is simple, with a small degree of improvement to the device, and remarkable effects. It can be applied to the punching work of foam materials with different shapes and specifications, and has a relatively broad scope of application. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a punching tool with a straight side wall;

[0017] Figure 2 It is a schematic structural diagram of a foam product punched by a punching tool with a straight side wall;

[0018] Figure 3 It is a schematic structural diagram of a punching tool with an arc-shaped side wall in Embodiment 1;

[0019] Figure 4 It is a schematic structural diagram of a foam product punched by a punching tool with an arc-shaped side wall;

[0020] Explanation of the marks in the figure:

[0021] 1 - Tool body, 2 - Grooved cutting edge, 3 - Arc-shaped side wall. Detailed Embodiment

[0022] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation methods and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0023] Embodiment 1:

[0024] As Figure 3A die-cutting tool for preventing deformation of a foam product, as shown, includes a tool body 1 and a groove-shaped cutting edge 2 provided at the bottom of the tool body 1. The depth, width and length of the end of the groove-shaped cutting edge 2 are all 10 mm, and the four side walls are all arc-shaped side walls 3 that are bent inward; the edge of the longitudinal section of the arc-shaped side wall 3 is a smooth arc with a radius of curvature of 6.4 mm, and its vertex is located at the center of the edge. Moreover, the vertices of the edges of the longitudinal sections of the four arc-shaped side walls 3 are located in the same horizontal plane, and the two opposite arc-shaped side walls 3 are symmetrically arranged with each other.

[0025] Working principle: Usually, the side walls of the cutting edge in a die-cutting tool are straight side walls (as shown in Figure 1 ), and during die-cutting, an extrusion effect is generated between the side walls and the foam material. Due to differences in shape structure and uneven density of the foam everywhere, the extrusion forces, extrusion directions and extrusion deformations received by each part of the side wall of the foam product are different. Furthermore, after the die-cutting tool is separated, the rebound effects generated by each part of the side wall of the foam product are inconsistent, and overall, irregular deformation occurs, affecting the product quality (as shown in Figure 2 ). However, in this die-cutting tool, through the setting of the arc-shaped side walls, an inward extrusion effect is uniformly applied to the periphery of the foam during the die-cutting process, forcing the same extrusion deformation to occur around the product. Furthermore, finally, the rebound effects of the foam product tend to be consistent, ensuring the regularity of the product shape (as shown in Figure 4 ).

[0026] Example 2:

[0027] In this example, the depth of the groove-shaped cutting edge 2 is 8 mm, and the ratio of the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall 3 to the depth of the groove-shaped cutting edge 2 is 5:10. The rest is the same as in Example 1.

[0028] Example 3:

[0029] In this example, the depth of the groove-shaped cutting edge 2 is 12 mm, and the ratio of the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall 3 to the depth of the groove-shaped cutting edge 2 is 8:10. The rest is the same as in Example 1.

[0030] Example 4:

[0031] In this example, the depth of the groove-shaped cutting edge 2 is 10 mm, and the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall 3 is 6 mm. The rest is the same as in Example 1.

[0032] Example 5:

[0033] In this example, the depth of the groove-shaped cutting edge 2 is 10 mm, and the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall 3 is 7 mm. The rest is the same as in Example 1.

[0034] The above description of the embodiments is provided to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention as disclosed should be within the protection scope of the present invention.

Claims

1. A die-cutting tool for preventing deformation of a foam product, the die-cutting tool comprising a tool body (1) and a groove-shaped cutting edge (2) provided at the bottom of the tool body (1), characterized in that, The side wall of the groove-shaped cutting edge (2) is an arc-shaped side wall (3) that bends inward; Through the arc-shaped side wall (3), the raw material is uniformly squeezed inward during the punching process. After leaving the punching tool, through the elastic return of the foam material, a foam product with regular shape is obtained; The edge of the longitudinal section of the arc-shaped side wall (3) is a smooth arc; Two opposite arc-shaped side walls (3) are symmetrically arranged; The vertex of the edge of the longitudinal section of the arc-shaped side wall (3) is located at the center of the edge of the longitudinal section; 2. The die-cutting tool for preventing deformation of the foam product according to claim 1, wherein, The vertices of the edges of the longitudinal sections of the two arc-shaped side walls (3) are located in the same horizontal plane; 3. The die-cutting tool for preventing deformation of the foam product according to claim 1, wherein The ratio of the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall (3) to the depth of the groove-shaped cutting edge (2) is (5-8):10; 4. The die-cutting tool for preventing deformation of the foam product according to claim 3, characterized in that The ratio of the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall (3) to the depth of the groove-shaped cutting edge (2) is (6-7):10; 5. The die-cutting tool for preventing deformation of the foam product according to claim 4, characterized in that, The ratio of the radius of curvature of the edge of the longitudinal section of the arc-shaped side wall (3) to the depth of the groove-shaped cutting edge (2) is 6.4:10; 6. The die-cutting tool for preventing deformation of the foam product according to claim 1, characterized in that, The depth of the groove-shaped cutting edge (2) is 8-12 mm; 7. The die-cutting tool for preventing deformation of the foam product according to claim 6, characterized in that, The depth of the groove-shaped cutting edge (2) is 10 mm.

Images