Asymmetric special-shaped part forging die

Abstract

The utility model provides an asymmetric special-shaped part forging die which is used for machining a fixed shaft locking sleeve and comprises an upper die body and a lower die body, and a columnar forming die cavity is formed in the lower die body in the height direction of the lower die body. An asymmetric special-shaped forming die cavity defined by a first curve section and a second curve section is formed in the upper die body, and the column-shaped forming die cavity is located below the asymmetric special-shaped forming die cavity. The fixed shaft locking sleeve is divided into an upper end structure and a lower end structure, the upper die body is used for machining and producing an asymmetric special-shaped structure of the fixed shaft locking sleeve, the lower die body is used for machining and producing a cylindrical structure of the fixed shaft locking sleeve, and the outer edge structure of the fixed shaft locking sleeve is re-carved in the upper die body in cooperation with the first curve section and the second curve section. The forging piece of the fixed shaft locking sleeve with a complex edge structure is obtained in the secondary forming process, the forging efficiency of the forging piece can be improved, materials are saved, the surface quality of the obtained forging piece is excellent, and guiding significance is achieved for forging of other asymmetric structures.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a forging mold for asymmetric special-shaped parts. Background Art

[0002] Forging is a machining process that uses a forging machine to apply pressure to a metal blank, causing it to plastically deform, resulting in forgings with defined mechanical properties, shapes, and sizes. It is one of the two main components of forging (forging and stamping). Forging eliminates defects such as as-cast porosity that occur during the metal smelting process, optimizes the microstructure, and, by preserving the metal's flow lines, generally provides forgings with superior mechanical properties compared to castings of the same material. Forgings are often used for critical parts in machinery subjected to high loads and harsh operating conditions.

[0003] Commonly used free forging equipment has long been popular due to its simplicity, versatility, low cost, and ability to maintain the inherent metal flow of the part material. However, with the demand for specialized mechanical equipment, some parts with irregular shapes that need to bear high loads are inevitable. Using cutting and other processing techniques for these parts would destroy the material's microstructure, making them unsuitable for high-load applications. Conventional free forging processes are not very good at handling such irregular shapes, and the parameters that need to be adjusted during production are too complex. Therefore, it is best to combine production with a corresponding mold. For such parts, a corresponding forging mold design is required. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art. The utility model proposes an asymmetric special-shaped part forging die for processing a fixed-axis locking sleeve with an asymmetric special-shaped structure.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an asymmetric special-shaped forging die for processing a fixed axis locking sleeve, comprising an upper die body and a lower die body,

[0006] A columnar molding cavity is provided in the lower mold body along the height direction of the lower mold body;

[0007] An asymmetric, special-shaped molding cavity enclosed by a first curved segment and a second curved segment is provided in the upper mold body, and the columnar molding cavity is located below the asymmetric, special-shaped molding cavity;

[0008] The first curved segment includes a first arc segment and a second arc segment, and the second arc segment is symmetrically arranged at both ends of the first arc segment;

[0009] The second curved segment includes a straight line segment and a third arc segment, and the third arc segment is symmetrically arranged at both ends of the straight line segment;

[0010] The end of the second arc segment is smoothly connected with the end of the third arc segment.

[0011] Furthermore, a first arc-shaped transition portion is provided at the junction of the first arc segment and the second arc segment.

[0012] Furthermore, a second arc-shaped transition portion is provided on the circumferential inner side of the columnar molding cavity close to one end of the asymmetric special-shaped molding cavity.

[0013] Furthermore, the radius of the second arc segment is greater than the radius of the first arc segment.

[0014] Furthermore, the angle between the connecting section of the second arc segment and the third arc segment and the axis of symmetry of the first curved segment or the second curved segment is 20°.

[0015] Compared with the prior art, the beneficial effects of the present invention include: by dividing the fixed-axis locking sleeve into upper and lower end structures, using the upper mold body to complete the processing and production of its asymmetric special-shaped structure, and using the lower mold body to complete the processing and production of its columnar structure, and by cooperating with the first curved segment and the second curved segment in the upper mold body to replicate the outer edge structure of the fixed-axis locking sleeve, a forging of the fixed-axis locking sleeve with a complex edge structure is obtained through a one-time shaping and a secondary molding process, which can improve the forging efficiency of the forging, save materials, and the surface quality of the obtained forging is excellent, which has guiding significance for the forging of other asymmetric structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0017] Figure 1 The schematic diagram shows the top view structure of the forging die for asymmetric special-shaped parts;

[0018] Figure 2 The side cross-sectional structure of the forging die for asymmetric special-shaped parts is schematically shown.

[0019] Numbers in the figure: 1-upper mold body, 2-lower mold body, 3-first curved segment, 4-second curved segment, 5-first arc segment, 6-second arc segment, 7-straight line segment, 8-third arc segment, 9-first arc-shaped transition portion, 10-second arc-shaped transition portion. DETAILED DESCRIPTION

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural methods and implementation methods. Therefore, the following specific embodiments and drawings are only illustrative of the technical solution of the present invention and should not be regarded as the entire present invention or as a limitation or restriction of the technical solution of the present invention.

[0021] Figure 1 The schematic diagram shows the top view structure of the forging die for asymmetric special-shaped parts; Figure 2 The schematic diagram shows the side cross-sectional structure of the asymmetric special-shaped part forging die. Figure 1-2 As shown, an asymmetric special-shaped forging die is used for processing a fixed-axis locking sleeve. The fixed-axis locking sleeve includes a shaft body at the lower section and an irregular locking sleeve at the upper section. Therefore, during the forging process of the fixed-axis locking sleeve, a segmented forging die needs to be set according to the shape of the fixed-axis locking sleeve.

[0022] Therefore, the asymmetric special-shaped forging die used for processing the fixed-axis locking sleeve includes an upper die body 1 and a lower die body 2. A columnar forming cavity is opened in the lower die body 2 along the height direction of the lower die body 2, and an asymmetric special-shaped forming cavity surrounded by a first curved segment 3 and a second curved segment 4 is provided in the upper die body 1. The aforementioned columnar forming cavity is located below the asymmetric special-shaped forming cavity, and is used to assist in completing the forming and forging process of the irregular area of ​​the fixed-axis locking sleeve.

[0023] The first curved segment 3 is described in detail below. The first curved segment 3 includes a first arc segment 5 and a second arc segment 6. The second arc segment 6 is symmetrically disposed at both ends of the first arc segment 5. The radius of the second arc segment 6 is greater than that of the first arc segment 5. A first arc-shaped transition portion 9 is disposed at the junction of the first arc segment 5 and the second arc segment 6. The ends of the first arc segment 5 and the second arc segment 6 are tangent to the first arc-shaped transition portion 9, forming the first curved segment 3.

[0024] The second curved segment 4 is described in detail below. The second curved segment 4 includes a straight segment 7 and a third arc segment 8. The third arc segment 8 is symmetrically arranged at both ends of the straight segment 7 and is tangent to the straight segment 7.

[0025] It is worth noting that the aforementioned first curved segment 3 and second curved segment 4 are smoothly connected by the end of the second arc segment 6 and the end of the third arc segment 8 to form an asymmetric, heteromorphic molding cavity. The angle between the connecting section of the second arc segment 6 and the third arc segment 8 and the axis of symmetry of the first curved segment 3 or the second curved segment 4 is 20°.

[0026] The aforementioned columnar forming cavity is set based on the symmetry axis of the aforementioned first curved segment 3 or second curved segment 4, and the columnar forming cavity is close to the first circular arc segment 5. In order to facilitate the flow of forging material during the forging process, a second arc-shaped transition portion 10 is provided on the circumferential inner side of the columnar forming cavity close to one end of the asymmetric special-shaped forming cavity.

[0027] The aforementioned asymmetric special-shaped forging die is used in the forming forging process of the fixed-axis locking sleeve. In the actual forging process, four firing steps are used to complete the forging of the fixed-axis locking sleeve, as follows:

[0028] First fire: After being drawn and rounded to a certain size, the blank is put into and out of the die to complete the material separation process. After upsetting one end, a hole is punched from the small end of the blank to complete the hole expansion process;

[0029] Second and third fires: insert a short mandrel into the punched hole, and use the same mold as the first curved segment on the upset end to complete the shaping process. The resulting big end size is slightly smaller than the forming size and its end is flattened;

[0030] Fourth fire: Place the forging obtained in the third fire into the asymmetric special-shaped part forging die, and place the die core in the through hole of the shaped part for positioning. After forging at the big head, the edge of the big head is fitted with the edge of the forging die to complete the forming process.

[0031] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the scope of protection of the present invention.

Claims

1. A forging die for asymmetric special-shaped parts, used for processing fixed axis locking sleeves, characterized in that: It comprises an upper mold body (1) and a lower mold body (2), A columnar molding cavity is provided in the lower mold body (2) along the height direction of the lower mold body (2); An asymmetric, special-shaped molding cavity enclosed by a first curved segment (3) and a second curved segment (4) is provided in the upper mold body (1), and the columnar molding cavity is located below the asymmetric, special-shaped molding cavity; The first curved segment (3) comprises a first circular arc segment (5) and a second circular arc segment (6), and the second circular arc segment (6) is symmetrically arranged at both ends of the first circular arc segment (5); The second curved segment (4) comprises a straight segment (7) and a third circular arc segment (8), and the third circular arc segment (8) is symmetrically arranged at both ends of the straight segment (7); The end of the second arc segment (6) is smoothly connected with the end of the third arc segment (8).

2. The asymmetric special-shaped part forging die according to claim 1, characterized in that: A first arc-shaped transition portion (9) is provided at the junction of the first circular arc segment (5) and the second circular arc segment (6).

3. The asymmetric special-shaped part forging die according to claim 1, characterized in that: A second arc-shaped transition portion (10) is provided on the inner circumferential side of the columnar molding cavity close to one end of the asymmetric special-shaped molding cavity.

4. The asymmetric special-shaped part forging die according to claim 1, characterized in that: The radius of the second circular arc segment (6) is greater than the radius of the first circular arc segment (5).

5. The asymmetric special-shaped part forging die according to claim 1, characterized in that: The angle between the connecting section of the second circular arc segment (6) and the third circular arc segment (8) and the axis of symmetry of the first curved segment (3) or the second curved segment (4) is 20°.

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