A punch die male cutter edge and a punch die

Abstract

The present application relates to the technical field of mould, especially to a punch cutting mould male cutter and a punch cutting mould. The male cutter comprises an outer wall and a cutter edge, the outer wall end and the cutter edge intersect at a first boundary line, a plurality of arc-shaped grooves are arranged along the first boundary line at intervals, each arc-shaped groove is located on the cutter edge surface, and the groove edge and the first boundary line have a common section. Compared with the prior art, the present application has the advantages of greatly shortening the punch cutting time, improving the production rhythm, reducing the production cost, effectively prolonging the service life of the cutter, etc.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a punching die cutting edge and a punching die. Background Technology

[0002] Fabric-based automotive interior parts are widely used due to their environmental friendliness, sound insulation, and low cost. The manufacturing processes for these parts include three types: First, molding with a molding die + foaming with a foaming die + punching with a punching die to cut edges and corners; second, molding with a molding die + punching with a punching die to cut edges and corners; and third, molding with a molding die and punching die, combining both processes. All three processes rely heavily on punching dies. In a highly competitive market, cost determines market share for OEMs and their suppliers, assuming equal quality. Transparent raw material prices force cost control to become a top priority for OEMs and their suppliers. Productivity equates to low cost, and the production cycle speed of mass-produced parts directly depends on the quality and lifespan of the dies.

[0003] Traditional punching dies typically feature self-shaped cutting edges. These include female (concave) and male (convex) self-shaped cutting edges. Figure 1 The diagram shows a front view of the conformal cutting edge structure and the pinching line state of the male and female cutting edges in the conformal design. It can be seen that the cutting edge of the conformal male cutting edge is flat. The working principle of the male and female cutting edges is that the male convex cutting edge is inserted into the female concave cutting edge to a certain depth under the action of the press, completing the punching of the part. However, the conformal cutting edge reduces the cutting edge pressure and increases the punching resistance, i.e., it reduces the destructive force on the object being cut and increases the tearing of the material during the punching process, making the cutting edge prone to chipping, with a short lifespan, long punching time, and poor punching edge quality. Therefore, the disadvantages of this type of cutting edge are easy chipping, high maintenance frequency, resulting in low production efficiency, and generally poor appearance quality of the punched product. Therefore, how to improve the production efficiency of automotive interior parts while ensuring the appearance quality of the punched product has become a problem that needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, such as long punching time, low production efficiency, and general appearance quality of punched products, and to provide a punching die cutting edge and a punching die.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] According to a first aspect of the present invention, a male cutting edge of a punching die is provided, the male cutting edge comprising an outer wall and a cutting edge, the end of the outer wall intersecting the cutting edge at a first boundary line, a plurality of arc-shaped grooves being spaced apart along the first boundary line, each of the arc-shaped grooves being located on the cutting edge surface of the cutting edge, and the groove edge having a common section with the first boundary line.

[0007] As a preferred technical solution, each of the arc-shaped grooves includes a first concave surface and a second concave surface. The first concave surface intersects the blade edge at a second boundary line, and the second concave surface intersects the first concave surface at a third boundary line and the blade edge at a fourth boundary line. The third boundary line is located in the area enclosed by the second boundary line and the fourth boundary line. The endpoints of the second boundary line, the endpoints of the third boundary line, and the fourth boundary line are all located on the common section.

[0008] As a preferred technical solution, the common section includes a first part and a second part, wherein the first part is the section where the second boundary line overlaps with the first boundary line, and the second part is the section where the fourth boundary line overlaps with the first boundary line, and the steepness of the first part is less than that of the second part.

[0009] As a preferred technical solution, the vertical distance from the highest intersection point of each arc-shaped groove and the first boundary line to the horizontal plane where the lowest point of the corresponding arc-shaped groove is located is a minimum of 1mm and a maximum of 3mm.

[0010] As a preferred technical solution, multiple arc-shaped grooves are equally spaced.

[0011] As a preferred technical solution, the outer wall is conformal.

[0012] As a preferred technical solution, the working depth of the male cutting edge is 2.5 to 5 mm.

[0013] As a preferred technical solution, the male cutting edge includes a first arc-shaped groove, a second arc-shaped groove, a third arc-shaped groove, and a fourth arc-shaped groove, wherein the first arc-shaped groove and the second arc-shaped groove are symmetrically arranged, and the third arc-shaped groove and the fourth arc-shaped groove are symmetrically arranged.

[0014] According to a second aspect of the present invention, a punching die is provided, comprising an upper die and a lower die, the upper die comprising the aforementioned male cutting edge, the lower die comprising a conformal female cutting edge, wherein the position of the male cutting edge in the upper die corresponds one-to-one with the position of the conformal female cutting edge in the lower die, and the male cutting edge and the conformal female cutting edge are in clearance fit.

[0015] As a preferred technical solution, the punching die includes a blanking groove, and the conformal female cutting edge is connected to the blanking groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention provides a novel male cutting edge for a punching die. Multiple arc-shaped grooves are spaced apart on the cutting edge surface along the boundary line between the outer wall end of the cutting edge and the cutting edge. Part of the groove edge coincides with the boundary line. The overall structure of the male cutting edge is similar to a tooth. When the male cutting edge is viewed from a direction perpendicular to the opening direction of the cutting edge, the edge of the male cutting edge is undulating, which can also be called a wave-shaped male cutting edge. This increases the biting and shearing ability of the die cutting edge, enabling the tool to form point contact with the material being cut, thereby increasing the cutting edge pressure, reducing punching resistance, greatly shortening the punching time, increasing the production cycle, effectively extending the service life of the cutting edge, improving the production efficiency of automotive interior parts, and helping to reduce production costs.

[0018] 2. The wave-shaped male cutting edge used in this invention forms a protrusion while opening the groove. The cutting edge between adjacent arc-shaped grooves is the protrusion. This protrusion can ensure point contact, effectively improve the destructive force of the cutting tool on the material being cut, reduce the tearing of the material during the punching process, help improve the punching edge quality of the material, and obtain a product with better appearance quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the traditional male and female blade structure and a kneading diagram;

[0020] Figure 2 This is a schematic diagram of the wavy male blade in Embodiment 1 of the present invention;

[0021] Figure 3 This is a top view of the wavy male blade in Embodiment 1 of the present invention;

[0022] Figure 4 This is a front view of the wavy male blade in Embodiment 1 of the present invention;

[0023] Figure 5 This is a cross-sectional view of the punching die in Embodiment 2 of the present invention;

[0024] Figure 6 This is a bottom view of the punching die in Embodiment 2 of the present invention;

[0025] Figure 7 This is a schematic diagram of the matching structure of the wavy male blade and the conformal female blade in Embodiment 2 of the present invention;

[0026] Among them: 1. Conformal outer wall; 2. Blade; 31. First boundary line; 32. Second boundary line; 33. Third boundary line; 34. Fourth boundary line; 41. First concave surface; 42. Second concave surface; 5. Upper mold; 6. Lower mold; 7. Wavy male blade edge; 8. Conformal female blade edge; 9. Scrap material drop groove. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0028] Example 1

[0029] like Figure 2 As shown, this embodiment provides a male cutting edge for a punching die. The male cutting edge includes a conformal outer wall 1 and a cutting edge 2. The end of the conformal outer wall 1 intersects with the cutting edge 2 at a first boundary line 31. Multiple arc-shaped grooves are spaced apart along the first boundary line 31. Each arc-shaped groove is located on the cutting surface of the cutting edge 2, and the groove edge has a common section with the first boundary line 31.

[0030] Figure 3 This is a top view of the male cutting edge. The first boundary 31 of the male cutting edge is a closed curve. In the top view, the first boundary 31 can be divided into an upper half, a lower half, a left half, and a right half. Along the first boundary 31, four first arc-shaped grooves, four second arc-shaped grooves, one third arc-shaped groove, and one fourth arc-shaped groove are formed on the cutting surface. The first and second arc-shaped grooves are symmetrically arranged, as are the third and fourth arc-shaped grooves. Specifically, the four first arc-shaped grooves are formed sequentially from left to right in the upper half of the first boundary 31, and correspondingly, the four second arc-shaped grooves are formed sequentially from left to right in the lower half of the first boundary 31; the third arc-shaped groove is formed in the left half of the first boundary 31, and correspondingly, the fourth arc-shaped groove is formed in the right half of the first boundary 31. In other embodiments, the number of arc-shaped grooves in each part can be greater, as long as it is suitable for the size specifications of the corresponding punching die.

[0031] For one of the arc-shaped grooves, the arc-shaped groove includes a first concave surface 41 and a second concave surface 42. The first concave surface 41 intersects the cutting edge at a second boundary line 32 (ACDB). The second concave surface 42 intersects the first concave surface 41 at a third boundary line 33 (AOB) and intersects the cutting edge at a fourth boundary line 34 (AB). The third boundary line 33 is located in the area enclosed by the second boundary line 32 and the fourth boundary line 34. The endpoints of the second boundary line 32, the third boundary line 33, and the fourth boundary line 34 are all located on a common section. The two endpoints of the second boundary line 32, the two endpoints of the third boundary line 33, and the two endpoints of the fourth boundary line 34 intersect at points A and B, respectively. The common section between the groove edge and the first boundary line 31 is an irregular line segment CABD. The irregular line segment CABD includes a first part and a second part. The first part is the overlapping section of the second boundary line 32 and the first boundary line 31, namely line segments AC and BD; the second part is the overlapping section of the fourth boundary line 34 and the first boundary line 31, namely line segment AB. (Combined...) Figure 2 and Figure 3It can be seen that the steepness of the first part is less than that of the second part; that is, the steepness of line segments AC and BD is less than that of line segment AB. In practical applications, the steepness of both parts is adjustable to better match the shape of the workpiece to be processed, thereby further improving processing efficiency and product quality. Furthermore, the first concave surface 41 and the first boundary line 31 have four intersection points and two overlapping sections. The highest intersection point between the first concave surface 41 and the first boundary line 31 is point C. The vertical distance from point C to the horizontal plane containing the lowest point of the arc-shaped groove is a minimum of 1 mm and a maximum of 3 mm. Figure 4 The cutting edge structure is shown as viewed from a direction perpendicular to the direction of the cutting edge opening. From this angle, the edge of the male cutting edge is undulating, so the male cutting edge structure provided in this embodiment can also be called a wave-shaped male cutting edge. Therefore, the amplitude w of the wave crest and trough can be considered to be between 1 mm and 3 mm.

[0032] In some other embodiments, the working depth d of the male cutting edge is between 2.5 mm and 5 mm.

[0033] In some other embodiments, multiple arc-shaped grooves are equally spaced along the first boundary 31.

[0034] Example 2

[0035] like Figure 5 As shown, this embodiment provides a punching die, including an upper die 5 and a lower die 6. Figure 6 This is a bottom view of the punching die, viewed from the side where the lower die 6 is located. Figure 5 The following is along Figure 6 The cross-sectional view of the mold taken from the plane containing PP, therefore Figure 5 The upper mold 5 is at the bottom, and the lower mold 6 is at the top.

[0036] from Figure 6 As can be seen, the upper mold 5 includes multiple wavy male cutting edges, and the lower mold 6 includes a corresponding number of conformal female cutting edges. The positions of the wavy male cutting edges in the upper mold 5 correspond one-to-one with the positions of the conformal female cutting edges in the lower mold 6, and each pair of wavy male and conformal female cutting edges are fitted with a clearance. Therefore, the top view of the corresponding wavy male cutting edge can be seen through the opening area of ​​each conformal female cutting edge. Combined with... Figure 5 and Figure 6 It can be seen that all male cutting edges in the lower mold 6 that may come into contact with the machined part can be set as wavy male cutting edge structures. Figure 6 The image shows a magnified view of a pair of male and female knives after they have been joined together.

[0037] Taking one pair of wavy male blade 7 and conformal female blade 8 as an example, such as Figure 7As shown. The wavy male cutting edge 7 is a convex cutting edge, and the conformal female cutting edge 8 is a concave cutting edge. The lower mold 6 also includes a scrap material discharge groove 9, and the conformal female cutting edge 8 is connected to the scrap material discharge groove 9.

[0038] The working principle of the aforementioned punching die is as follows: the wave-shaped male cutting edge is inserted into the conformal female cutting edge to a certain depth under the action of the press, thus completing the punching of the part.

[0039] The wavy male cutting edge, with its protruding structure resembling teeth, increases the biting and shearing capacity of the die. The principle is that the wavy male cutting edge increases the pressure during the punching process, which is the destructive force on the material, i.e., shearing force efficiency. Under the same press pressure, it can quickly pierce the felt blank material of the fabric to complete the punching, achieving a faster piercing speed and shorter piercing time compared to a conformal male cutting edge. The difference between wavy and conformal male cutting edges during the punching process lies in:

[0040] (1) The wave-shaped male blade makes point contact with the material being cut, which increases the blade pressure and can increase the destructive force on the object being cut. The conformal male blade makes line contact with the material simultaneously, which reduces the blade pressure and thus reduces the destructive force on the object being cut.

[0041] (2) The wave-shaped male cutting edge reduces the punching resistance and the tearing of the material during the punching process, resulting in a longer cutting edge life and a shorter punching time. This can effectively improve production efficiency and the quality of the punched edge, making the product appearance quality better. On the other hand, the conformal male cutting edge increases the punching resistance and the tearing of the material during the punching process, making the cutting edge prone to breakage, with a short life and a long punching time, resulting in low production efficiency and poor punched edge quality, which means the appearance quality is average.

[0042] Therefore, under the same press pressure, a corrugated male cutting edge has an advantage over a conformal male cutting edge. Furthermore, a corrugated male cutting edge requires less press force than a conformal male cutting edge.

[0043] The wave-shaped male cutting edge provided in this embodiment can be applied to edge punching dies for fabric parts such as automobiles, motorcycles, electric two-wheelers, electric tricycles, and airplanes, and has good market prospects. Putting punching dies with wave-shaped male cutting edges into production applications can fully meet the high-speed production pace, effectively improve production efficiency, and control production time and costs.

[0044] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A punching die with a male cutting edge, characterized in that, The male blade includes an outer wall and a blade edge. The end of the outer wall intersects the blade edge at a first boundary line. Multiple arc-shaped grooves are spaced apart along the first boundary line. Each arc-shaped groove is located on the blade edge surface, and the groove edge has a common section with the first boundary line. Each of the arc-shaped grooves includes a first concave surface and a second concave surface. The first concave surface intersects the blade edge at a second boundary line. The second concave surface intersects the first concave surface at a third boundary line and the blade edge at a fourth boundary line. The third boundary line is located in the area enclosed by the second boundary line and the fourth boundary line. The endpoints of the second boundary line, the third boundary line, and the fourth boundary line are all located on the common section. The common section includes a first part and a second part. The first part is the section where the second boundary line overlaps with the first boundary line, and the second part is the section where the fourth boundary line overlaps with the first boundary line. The steepness of the first part is less than that of the second part.

2. The male cutting edge of the punching die according to claim 1, characterized in that, The vertical distance from the highest intersection point of each of the arc-shaped grooves and the first boundary line to the horizontal plane where the lowest point of the corresponding arc-shaped groove is located is a minimum of 1 mm and a maximum of 3 mm.

3. The male cutting edge of the punching die according to claim 1, characterized in that, Multiple arc-shaped grooves are equally spaced apart.

4. The male cutting edge of the punching die according to claim 1, characterized in that, The outer wall is irregular in shape.

5. The male cutting edge of the punching die according to claim 1, characterized in that, The working depth of the male blade is 2.5~5mm.

6. The male cutting edge of the punching die according to claim 1, characterized in that, The male cutting edge includes a first arc-shaped groove, a second arc-shaped groove, a third arc-shaped groove, and a fourth arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are symmetrically arranged, and the third arc-shaped groove and the fourth arc-shaped groove are symmetrically arranged.

7. A punching die, comprising an upper die and a lower die, characterized in that, The upper mold includes a male cutting edge as described in any one of claims 1-6, and the lower mold includes a conformal female cutting edge. The position of the male cutting edge in the upper mold corresponds one-to-one with the position of the conformal female cutting edge in the lower mold, and the male cutting edge and the conformal female cutting edge are fitted with a clearance.

8. The punching die according to claim 7, characterized in that, The punching die includes a blanking groove, and the conformal female cutting edge is connected to the blanking groove.

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