A punch structure

Abstract

The present invention discloses a punch structure, including a punch body. A groove group is arranged on the outer peripheral surface of the punch body, and the groove group intersects with the working end surface of the punch body to form a cutting edge, which can reduce the punching force during the punching process, thereby reducing the damage to the punch and making it easier to cut the material. The existence of the groove group can collect fine iron filings in the punching process and inorganic salts falling off the surface of silicon steel in the groove group, thereby reducing friction and reducing dust at the same time, solving the problems of excessive burrs and excessive collapse angles of the product.

Description

Technical Field

[0001] The invention relates to the field of stamping, and in particular to a punch structure. Background Art

[0002] During the metal punching process, the punch's cutting edge is subjected to high-frequency impacts, and there is great friction between the side of the punch that is in direct contact with the metal blank fracture. After a certain number of punchings, the following phenomena will occur: 1. The product burrs are too large and the collapse angle is too large; 2. The punch collapses; 3. Iron filings and other waste slag are generated during the punching process. Especially in some iron cores made of electrical steel, the collapse angle and burrs are too large, which will directly reduce the lamination factor of silicon steel and increase the iron loss of silicon steel sheets, directly leading to an increase in the excitation current of silicon steel, which reduces the magnetic conductivity efficiency of silicon steel and causes temperature rise.

[0003] In summary, there is an urgent need for a punch structure to solve the problem in the prior art that the punch is easy to break and the punched product quality is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a punch structure to solve the problem of easy collapse of the punch and poor quality of punched products in the prior art. The specific technical solution is as follows:

[0005] A punch structure comprises a punch body; a groove group is arranged on the outer peripheral surface of the punch body, and the groove group intersects with the working end surface of the punch body to form a cutting edge.

[0006] Preferably, the groove group comprises a plurality of first grooves; the tangent line of the first groove is L1, the axis line of the punch body is L2; ​​and the angle between L1 and L2 is θ1.

[0007] The above technical solution is preferably that θ1≠0°, θ1≠180° and θ1≠90°, and a plurality of groups of first grooves intersect with the working end face of the punch body to form a plurality of first cutting edges.

[0008] Preferably, the groove group further comprises a plurality of second grooves; the angle between the tangent of the second groove and L2 is θ2, θ1 and θ2 are complementary; the first groove and the second groove intersect with the working end face of the punch body to form a plurality of second cutting edges.

[0009] Preferably, in the above technical solution, the first cutting edge and the second cutting edge are staggered along the circumference of the punch body.

[0010] The above technical solution is preferably that θ1=90°, a group of first grooves intersect with the working end face of the punch body to form an annular third cutting edge, or that θ1=0° or θ1=180°, the first grooves intersect with the working end face of the punch body to form a plurality of fourth cutting edges.

[0011] Preferably, in the above technical solution, the width of the first groove at the opening position is P1, P1 is 0.1-0.15 mm; the depth of the first groove is H1, H1 is 0.1-0.2 mm.

[0012] In the above technical solution, preferably, P1 is 0.15 mm; H1 is 0.15 mm.

[0013] In the above technical solution, preferably, the angle θ1 is 45° or 135°.

[0014] Preferably, the above technical solution is provided with a lubricating medium in the groove group.

[0015] The application of the technical solution of the present invention has the following beneficial effects:

[0016] (1) The present invention provides a groove group on the outer peripheral surface of the punch body. The groove group intersects with the working end surface of the punch body to form a cutting edge, which can reduce the punching force during the punching process, thereby reducing damage to the punch and making the material easier to cut. The presence of the groove group can collect fine iron filings during the punching process and inorganic salts falling off the surface of silicon steel in the groove group, thereby reducing friction and reducing dust at the same time, solving the problems of excessive burrs and excessive collapse angles of the product.

[0017] (2) The present invention can effectively improve product quality by changing the shape of the working end face of the punch body (i.e. forming a cutting edge), and the present invention preferably arranges the first cutting edge and the second cutting edge in an alternating manner, thereby improving the punching efficiency.

[0018] (3) The present invention provides a lubricating medium (such as lubricating oil, anti-rust oil) in the groove group, which can effectively reduce friction, and the lubricating medium has an adsorption force on fine impurities, which can improve product quality.

[0019] In addition to the above-described purposes, features and small dust adsorption, advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] In the attached picture:

[0022] Figure 1 Schematic diagram of the angle between the first groove cutting and the punch body axis in this embodiment;

[0023] Figure 2 is a schematic diagram of the first groove in this embodiment (illustrating the situation where L1 is neither parallel nor perpendicular to L2);

[0024] Figure 3 yes Figure 2 A magnified view of middle;

[0025] Figure 4 is a schematic diagram of a first groove and a second groove;

[0026] Figure 5 yes Figure 4 Enlarged view of middle B;

[0027] Figure 6 is a schematic diagram of the first groove in this embodiment (illustrating the situation where L1 is perpendicular to L2);

[0028] Figure 7 yes Figure 6 A partial side view of

[0029] Figure 8 is a schematic diagram of the first groove in this embodiment (illustrating the situation where L1 is parallel to L2);

[0030] Fig. 9 is a schematic cross-sectional view of the first groove in this embodiment;

[0031] Among them, 1. punch body; 1.1. working end face of the punch body; 1.1a. first cutting edge; 1.1b. second cutting edge; 1.1c. third cutting edge; 1.1d. fourth cutting edge; 2. first groove; 3. second groove. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0033] Embodiment 1:

[0034] A punch structure comprises a punch body 1 (cylindrical body); a groove group is arranged on the outer peripheral surface of the punch body 1, and the groove group intersects with the working end surface 1.1 of the punch body to form a cutting edge, such as Figure 1-9 As shown, the details are as follows:

[0035] like Figure 1 As shown, the groove group includes multiple groups of first grooves 2, the first grooves 2 are arranged on the outer peripheral surface of the punch body 1, the tangent of the first groove 2 is L1, the axis of the punch body 1 is L2, the angle between L1 and L2 is θ1, 0°≤θ1≤180°, and the groove group of this embodiment is preferably the following:

[0036] The first type: Figure 2 and Figure 3As shown, when θ1≠0° and θ1≠180° and θ1≠90° (ie, L1 is not parallel and not perpendicular to L2), the first groove 2 intersects with the working end surface 1.1 of the punch body to form a first cutting edge 1.1a. Figure 3 The middle dotted line indicates the first cutting edge 1.1a.

[0037] Preferably, Figure 4 and Figure 5 As shown, the groove group also includes multiple groups of second grooves 3, and the second grooves 3 are arranged on the outer peripheral surface of the punch body 1. The angle between the tangent of the second groove 3 and L2 is θ2, and θ1 is complementary to θ2 (that is, the spiral directions of the first groove 2 and the second groove 3 are opposite), and the first groove 2 and the second groove 3 intersect with the working end face 1.1 of the punch body to form a second cutting edge 1.1b. Figure 5 The middle dotted line indicates the second cutting edge 1.1b.

[0038] In this embodiment, the number of the first grooves 2 is twice the number of the second grooves 3 , and the formed first cutting edges 1 . 1 a and second cutting edges 1 . 1 b are alternately arranged along the circumferential direction of the punch body 1 .

[0039] The second type: Figure 6 and Figure 7 As shown, when θ1=90° (ie, L1 is perpendicular to L2), the first grooves 2 are circumferential grooves, and a group of first grooves 2 intersect with the working end face 1.1 of the punch body to form an annular third cutting edge 1.1c.

[0040] The third type: Figure 8 As shown, when θ1=0° or θ1=180° (ie, L1 is parallel to L2), the first groove 2 is a straight groove, and the first groove 2 penetrates the working end surface 1.1 of the punch body to form a fourth cutting edge 1.1d.

[0041] The shapes of the first cutting edge 1.1a, the second cutting edge 1.1b, the third cutting edge 1.1c and the fourth cutting edge 1.1d of this embodiment are selected according to actual processing requirements, that is, the intersection position of the working end surface 1.1 of the punch body and the first groove 2 or the second groove 3 is selected according to actual conditions. In this embodiment, the shape of the first cutting edge 1.1a is preferably V-shaped, the shape of the second cutting edge 1.1b is W-shaped, the shape of the third cutting edge 1.1c is an annular arc, and the shape of the fourth cutting edge 1.1d is U-shaped.

[0042] Preferably, lubricating medium (such as lubricating oil, anti-rust oil) is provided in both the first groove 2 and the second groove 3 of this embodiment.

[0043] In this embodiment, the cross-sectional shape of the first groove 2 is consistent with the cross-sectional shape of the second groove 3. Preferably, the cross-sectional shape of the first groove 2 is U-shaped, rectangular or V-shaped.

[0044] like Fig. 9 As shown, Fig. 9 It shows a cross-sectional schematic diagram perpendicular to the tangent line of the first groove 2, and only shows a partial view; the width of the opening position of the first groove 2 of this embodiment is P1, and P1 is 0.1-0.15mm; the depth of the first groove 2 is H1, and H1 is 0.1-0.2mm, and the θ1 is 45° or 135°. In this embodiment, preferably P1 is 0.15mm; H1 is 0.15mm; θ1 is 45°.

[0045] Comparative Example 1:

[0046] The only difference between Comparative Example 1 and Example 1 is that P1 of Comparative Example 1 is 0.05 mm.

[0047] Embodiment 2:

[0048] The only difference between the present embodiment 2 and the embodiment 1 is that P1 of the present embodiment 2 is 0.1 mm.

[0049] Comparative Example 2:

[0050] The only difference between Comparative Example 2 and Example 1 is that P1 of Comparative Example 2 is 0.2 mm.

[0051] Comparative Example 3:

[0052] The only difference between Comparative Example 3 and Example 1 is that H1 of Comparative Example 3 is 0.05 mm.

[0053] Embodiment 3:

[0054] The only difference between the present embodiment 3 and the embodiment 1 is that H1 of the present embodiment 3 is 0.1 mm.

[0055] Embodiment 4:

[0056] The only difference between the present embodiment 4 and the embodiment 1 is that H1 of the present embodiment 4 is 0.2 mm.

[0057] Comparative Example 4:

[0058] The only difference between Comparative Example 4 and Example 1 is that θ1 of Comparative Example 4 is 15°.

[0059] Comparative Example 5:

[0060] The only difference between Comparative Example 5 and Example 1 is that θ1 of Comparative Example 5 is 90°.

[0061] Embodiment 5:

[0062] The only difference between the fifth embodiment and the first embodiment is that θ1 in the fifth embodiment is 135°.

[0063] Table 1 Comparison of section integrity coefficients

[0064]

[0065] It can be seen from Table 1 that when the width and depth of the first groove are 0.15 mm and θ1 is 45° or 135°, the section integrity coefficient is the largest. Section integrity coefficient: According to the shear direction, there are collapse angles, shear bands, fracture bands, tear angles, burrs and other features from top to bottom. The shear section quality is evaluated according to the height of each feature. In order to quantitatively evaluate the geometric characteristics of the shear section, the section integrity coefficient is defined. The section integrity coefficient can be obtained by testing existing section quality detection equipment.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A punch structure, characterized in that: It comprises a punch body (1); a groove group is arranged on the outer peripheral surface of the punch body (1), and the groove group intersects with the working end surface (1.1) of the punch body to form a cutting edge; The groove group comprises a plurality of groups of first grooves (2); the tangent line of the first groove (2) is L1, the axis of the punch body (1) is L2; ​​the angle between L1 and L2 is ; The groove group further comprises a plurality of groups of second grooves (3); the angle between the tangent line of the second groove (3) and L2 is , and The first groove (2) and the second groove (3) intersect with the working end surface (1.1) of the punch body to form a plurality of second cutting edges (1.1b), and the shape of the second cutting edges (1.1b) is W-shaped; Said and as well as , a plurality of groups of first grooves (2) intersect with the working end surface (1.1) of the punch body to form a plurality of first cutting edges (1.1a); The first cutting edge (1.1a) and the second cutting edge (1.1b) are arranged alternately along the circumference of the punch body (1).

2. The punch structure according to claim 1, characterized in that: The width of the opening of the first groove (2) is P1, which is 0.1-0.15 mm; the depth of the first groove (2) is H1, which is 0.1-0.2 mm.

3. The punch structure according to claim 2, characterized in that: P1 is 0.15mm; H1 is 0.15mm.

4. The punch structure according to any one of claims 1 to 3, characterized in that: Said 45° or 135°.

5. The punch structure according to claim 1, characterized in that: A lubricating medium is arranged in the groove group.

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