Anti-starving hexagon bolt forming stamping die assembly

Abstract

An anti-starving hexagon bolt forming stamping die assembly comprises a first stamping die and a second stamping die which are sequentially arranged, the first stamping die comprises a first lower pressure-bearing die and a first upper stamping die, a first pressure-bearing groove is formed in the first lower pressure-bearing die, and a first hexagon forming stamping groove corresponding to the first pressure-bearing groove is formed in the first upper stamping die; the corners in the first hexagonal forming punching groove are subjected to arc treatment; the first hexagonal forming punching groove is in a horn mouth shape with the small inside and the large outside. The second stamping die comprises a second lower pressure-bearing die and a second upper stamping die, a second pressure-bearing groove is formed in the second lower pressure-bearing die, and a second hexagonal forming stamping groove corresponding to the second pressure-bearing groove is formed in the second upper stamping die. The hexagonal prism nut is firstly formed in the first stamping process, and the side face extrusion force of the hexagonal prism nut is gradually increased in the second stamping process; and the edges of the hexagonal prism nut are subjected to arc treatment, and arcs are extruded into edges and corners of the hexagonal nut, so that the situation that the edges and corners are not formed fully is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt processing, and particularly relates to a forming die assembly for a hexagonal bolt to prevent material shortage. Background Art

[0002] The bolt forming process is a complex and multi-step process. Cold forging and forming the processed material is a key step in bolt forming. Cold forging and forming usually adopts cold heading plastic processing and is formed by die stamping, so that the metal fibers are continuous along the shape of the product, thereby improving the strength and mechanical properties of the product.

[0003] For a common hexagonal flange bolt, when it is stamped and formed, usually a circular forming punch groove is used for the first punch die, and a hexagonal forming punch groove for forming the hexagonal nut of the bolt is used for the second punch die. When forming the hexagonal nut of the bolt, there is no material supplement for the hexagon, which easily causes material shortage, making the formed hexagonal nut extremely unfilled. The hexagonal nut of the product is prone to failure during use, and the customer cannot use it, which cannot meet the customer's needs.

[0004] Therefore, aiming at the deficiencies of the existing technology, it is necessary to design a forming die assembly for a hexagonal bolt to prevent material shortage to solve the above problems.

[0005] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solution of the present utility model and facilitating the understanding of those skilled in the art. It cannot be considered that the above content is well-known to those skilled in the art just because these contents are described in the background art of the present utility model. Content of the Utility Model

[0006] To overcome the above deficiencies in the prior art, the purpose of the present utility model is to disclose a forming die assembly for a hexagonal bolt to prevent material shortage, which is used to prevent the unfilled state at the nut of the hexagonal bolt during forming.

[0007] The present utility model discloses a forming die assembly for a hexagonal bolt to prevent material shortage, which includes a first punch die and a second punch die arranged in sequence, wherein:

[0008] The first punching die includes a first lower pressure-bearing die and a first upper punching die. A first pressure-bearing groove for placing bolts is provided on the first lower pressure-bearing die, and a first hexagonal forming punching groove corresponding to the first pressure-bearing groove is provided on the first upper punching die, which is used to first punch a hexagonal prism nut on the top of the bolt; the corners of the first hexagonal forming punching groove are all rounded. When the second punching die punches, the rounded corners will fill the edges and corners of the newly formed hexagonal nut under extrusion, avoiding incomplete formation of the hexagonal nut; the first hexagonal forming punching groove is in the shape of a flared mouth with a smaller inner side and a larger outer side; when the second punching die punches, the hexagonal prism nut formed by the first upper punching die is gradually extruded from the outside to the inside during the secondary punching, further increasing the fullness of the formed hexagonal nut.

[0009] The second punching die includes a second lower pressure-bearing die and a second upper punching die. A second pressure-bearing groove is provided on the second lower pressure-bearing die, and a second hexagonal forming punching groove corresponding to the second pressure-bearing groove is provided on the second upper punching die, which is used to process the hexagonal prism nut into the final required hexagonal nut.

[0010] Preferred technical solution: The distance between the opposite sides at the bottom of the first hexagonal forming punching groove is less than the distance between the opposite sides of the second hexagonal forming punching groove; this enables the front end of the hexagonal prism nut punched by the first punching die to more easily enter the second hexagonal forming punching groove. The distance between the opposite sides at the opening of the first hexagonal forming punching groove is greater than the distance between the opposite sides of the second hexagonal forming punching groove. During the punching process of the second punching die, the side walls of the second hexagonal forming punching groove gradually extrude the hexagonal prism nut along its side walls towards the inside, making the newly formed hexagonal nut more full.

[0011] Preferred technical solution: The depth of the first hexagonal forming punching groove is greater than the depth of the second hexagonal forming punching groove. During the punching process of the second punching die, the hexagonal prism nut punched by the first punching die will be compressed again in the vertical direction, improving its forming fullness.

[0012] Preferred technical solution: The R angle range of the arc in the first hexagonal forming punching groove is 0.5 degrees - 1.5 degrees.

[0013] Preferred technical solution: A first ejector rod is provided at the lower end of the first pressure-bearing groove; a second ejector rod is provided at the lower end of the second pressure-bearing groove, which is used to limit the bottom of the bolt during the punching process and eject the bolt after punching.

[0014] Preferred technical solution: The first lower pressure-bearing die and the second lower pressure-bearing die are the same movable pressure-bearing die. The bolt is successively brought to the positions of the first lower pressure-bearing die and the second lower pressure-bearing die by the movable pressure-bearing die for punching and forming operations; the first pressure-bearing groove and the second pressure-bearing groove are the same pressure-bearing groove; the first ejector rod and the second ejector rod are the same ejector rod.

[0015] Due to the application of the above technical solutions, the beneficial effects of the anti-material-deficiency hexagonal bolt forming punching die assembly of the present utility model are as follows:

[0016] (1) In the first stamping process, a hexagonal prism nut similar to the final hexagonal nut is first formed. In the second stamping process, the side extrusion pressure of the hexagonal prism nut is gradually increased, thereby increasing the fullness of the hexagonal nut forming. Its structure is simple and practical;

[0017] (2) The edges of the hexagonal prism nut are rounded. In the second stamping process, the arc is extruded into the edges of the hexagonal nut to avoid incomplete formation of the edges. Description of the Drawings

[0018] Figure 1 It is an exploded view of a forming die assembly for a hexagonal bolt with anti-material shortage in Embodiment 1;

[0019] Figure 2 It is an exploded view of a forming die assembly for a hexagonal bolt with anti-material shortage in Embodiment 2;

[0020] Figure 3 It is the front view of the first upper stamping die and the second upper stamping die in the present utility model;

[0021] Figure 4 It is Figure 3 The cross-sectional view taken along A-A in

[0022] In the above drawings, 1, the first stamping die; 11, the first lower pressure-bearing die; 11a, the first pressure-bearing groove; 11b, the first ejector rod; 12, the first upper stamping die; 12a, the first hexagonal forming punching groove; 2, the second stamping die; 21, the second lower pressure-bearing die; 21a, the second pressure-bearing groove; 21b, the second ejector rod; 22, the second upper stamping die; 22a, the second hexagonal forming punching groove; 3, the bolt; 31, the hexagonal prism nut; 32, the hexagonal nut. Specific Embodiments

[0023] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Embodiment 1:

[0027] As Figure 1 shown, a forming die assembly for a hexagonal bolt to prevent material shortage disclosed by the present utility model includes a first die 1 and a second die 2 arranged in sequence. The main components of the above-mentioned present utility model will be specifically described below:

[0028] As Figure 1 shown, the first die 1 includes a first lower pressure-bearing die 11 and a first upper stamping die 12. A first pressure-bearing groove 11a is provided on the first lower pressure-bearing die 11, and a first ejector rod 11b is provided at the lower end of the first pressure-bearing groove 11a; a first hexagonal forming punching groove 12a corresponding to the first pressure-bearing groove 11a is provided on the first upper stamping die 12. The corners in the first hexagonal forming punching groove 12a are all processed into arcs, and the R angle of the arc is 1°; the first hexagonal forming punching groove 12a is in the shape of a flared opening with a smaller inner diameter and a larger outer diameter.

[0029] As Figure 1 、 Figure 3 and Figure 4As shown in the figure, the second punching die 2 includes a second lower pressure-bearing die 21 and a second upper punching die 22. A second pressure-bearing groove 21a is provided on the second lower pressure-bearing die 21, and a second ejector rod 21b is provided at the lower end of the second pressure-bearing groove 21a; a second hexagonal forming punching groove 22a corresponding to the second pressure-bearing groove 21a is provided on the second upper punching die 22; the distance between the opposite sides of the second hexagonal forming punching groove 22a is greater than the distance between the opposite sides of the bottom of the first hexagonal forming punching groove 12a and less than the distance between the opposite sides of the opening of the first hexagonal forming punching groove 12a; the depth of the second hexagonal forming punching groove 22a is less than the depth of the first hexagonal forming punching groove 12a.

[0030] Reference Figure 1 、 Figure 3 and Figure 4 As shown in the figure, the principle of a hexagonal bolt forming punching die assembly of the present utility model is as follows: During operation, the bolt 3 is first placed into the first pressure-bearing groove 11a and positioned by the first ejector rod 11 at the rear end. Then, the first upper punching die 12 moves towards the first lower pressure-bearing die 11, and the first hexagonal forming punching groove 12a punches the top of the bolt 3 to form a hexagonal prism nut 31. The edges of the hexagonal prism nut 31 are arc-shaped, and the circumferential dimension of the hexagonal prism nut 31 gradually increases from the top to the bottom; the first ejector rod 11 ejects the bolt 3 that has been punched once from the first pressure-bearing groove 11a; then, the bolt 3 that has been punched once is placed into the second pressure-bearing groove 21a and limited and fixed by the second ejector rod 21b. The second upper punching die 22 moves towards the second lower pressure-bearing die 21. During this process, the circumferential side wall of the hexagonal prism nut 31 is gradually squeezed inward by the side wall of the second pressure-bearing groove 21a to supplement the corners of the newly formed hexagonal nut 32, making the newly formed hexagonal nut 32 more plump.

[0031] Embodiment 2: As shown in Figure 2 、 Figure 3 and Figure 4 the figure, the difference between this embodiment and Embodiment 1 is that the first lower pressure-bearing die 11 and the second lower pressure-bearing die 21 are the same movable pressure-bearing die; the first pressure-bearing groove 11a and the second pressure-bearing groove 21a are the same pressure-bearing groove; the first ejector rod 11b and the second ejector rod 21b are the same ejector rod. During the punching operation, the movable pressure-bearing die drives the bolt 3 to pass through the first punching die 1 and the second punching die 2 in sequence for two punching operations.

[0032] The above embodiments only illustratively explain the principle and its effects of the present utility model, rather than being used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A hexagonal bolt forming die assembly for preventing material shortage, comprising a first die (1) and a second die (2), characterized in that: The first punching die (1) comprises a first lower pressure-bearing die (11) and a first upper punching die (12); the first lower pressure-bearing die (11) is provided with a first pressure-bearing groove (11a); the first upper punching die (12) is provided with a first hexagonal forming punching groove (12a) arranged corresponding to the first pressure-bearing groove (11a); the corners of the first hexagonal forming punching groove (12a) are all arc-processed; the first hexagonal forming punching groove (12a) is in the shape of a trumpet with a small inside and a large outside; The second punching die (2) comprises a second lower pressure-bearing die (21) and a second upper punching die (22); the second lower pressure-bearing die (21) is provided with a second pressure-bearing groove (21a); ​​and the second upper punching die (22) is provided with a second hexagonal forming punching groove (22a) arranged corresponding to the second pressure-bearing groove (21a).

2. The anti-shortage hexagonal bolt forming die assembly according to claim 1, characterized in that: The distance across the sides at the bottom of the first hexagonal forming groove (12a) is smaller than the distance across the sides of the second hexagonal forming groove (22a); and the distance across the sides at the opening of the first hexagonal forming groove (12a) is larger than the distance across the sides of the second hexagonal forming groove (22a).

3. The anti-shortage hexagonal bolt forming die assembly according to claim 2, characterized in that: The depth of the first hexagonal forming groove (12a) is greater than the depth of the second hexagonal forming groove (22a).

4. The anti-shortage hexagonal bolt forming die assembly according to claim 3, characterized in that: The R angle range of the arc in the first hexagonal forming punching groove (12a) is 0.5 degrees to 1.5 degrees.

5. The hexagonal bolt forming die assembly for preventing material shortage according to claim 4, characterized in that: A first push rod (11b) is provided at the lower end of the first pressure-bearing groove (11a); and a second push rod (21b) is provided at the lower end of the second pressure-bearing groove (21a).

6. The anti-shortage hexagonal bolt forming die assembly according to claim 5, characterized in that: The first lower pressure-bearing die (11) and the second lower pressure-bearing die (21) are the same movable pressure-bearing die; the first pressure-bearing groove (11a) and the second pressure-bearing groove (21a) are the same pressure-bearing groove; and the first ejector rod (11b) and the second ejector rod (21b) are the same ejector rod.

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