Split type lower die for shaft head pre-forging machining

Abstract

The utility model discloses a split type lower die for shaft head pre-forging machining, which belongs to the technical field of shaft head pre-forging machining and comprises a die sleeve, a first die core and a second die core. The die sleeve is of a big-end-down circular truncated cone structure, and a big-end-down circular truncated cone-shaped inner cavity is formed in the die sleeve; the first mold core comprises a working part and a connecting part; the working part is of a big-end-down circular truncated cone structure; the diameter of the connecting part is smaller than that of the end face of the working part; the working part and the connecting part are integrally machined, and the connecting part is located below the working part. The first mold core is provided with a first working cavity penetrating through the working part and the connecting part; the second mold core is of a big-end-down circular truncated cone structure; a connecting hole in interference fit with the connecting part is formed in the upper end surface of the second mold core; a support positioning hole is formed in the lower end face of the second mold core. Compared with the prior art, the utilization rate of mold materials is effectively improved, and the mold cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft head pre-forging processing, and more specifically, belongs to a split lower die used for shaft head pre-forging processing. Background Art

[0002] Currently, after the shaft head is pre-forged, the existing pre-forging lower die cannot be repaired due to its structural characteristics. Therefore, the entire pre-forging lower die can only be scrapped directly after the die life ends. As a result, the utilization rate of the die material is low and the investment cost is high. Summary of the Invention

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional technology and provide a split lower die for pre-forging of the shaft head, so as to improve the utilization rate of the die material and reduce the cost of the die.

[0004] The utility model provides a split lower die for pre-forging of an axle head, comprising a die sleeve, a first die core and a second die core;

[0005] The mold sleeve is a truncated cone structure with a small top and a large bottom, and a truncated cone-shaped inner cavity with a small top and a large bottom is opened in the mold sleeve;

[0006] The first mold core includes a working portion and a connecting portion; the working portion is a truncated cone structure with a smaller top and a larger bottom; the connecting portion is a cylindrical structure, the diameter of the connecting portion is smaller than the end face diameter of the working portion; the working portion and the connecting portion are integrally processed, and the connecting portion is located below the working portion; the first mold core is provided with a first working cavity that passes through the working portion and the connecting portion;

[0007] The second mold core is a truncated cone structure with a smaller top and a larger bottom; the upper end surface of the second mold core is provided with a connection hole that is interference-fitted with the connection portion; the lower end surface of the second mold core is provided with a bracket positioning hole; the second mold core is provided with a second working cavity, and the upper and lower ends of the second working cavity are respectively connected to the connection hole and the bracket positioning hole;

[0008] The first mold core is tightly connected to the upper part of the second mold core through the interference fit between the connecting portion and the connecting hole; the first mold core and the second mold core are interference fit in the upper part and the lower part of the inner cavity respectively;

[0009] In the assembled state, the lower end surface of the mold sleeve and the lower end surface of the second mold core are in the same plane.

[0010] Furthermore, the upper end surface of the mold sleeve is provided with first screw holes distributed in a ring array; the upper end surface of the first mold core is provided with second screw holes distributed in a ring array; the lower end surface of the second mold core is provided with third screw holes distributed in a ring array; the first screw holes, the second screw holes and the third screw holes have the same standard thread specifications.

[0011] Further, it further includes a pressing plate; a first positioning groove distributed in an annular array is formed on the lower end surface of the die sleeve, and one end of the first positioning groove communicates with the inner cavity; a second positioning groove distributed in an annular array is formed on the edge of the lower end surface of the second die core, and the second positioning groove penetrates through the side surface of the second die core.

[0012] In the assembled state, the pressing plate is located in the first positioning groove and the second positioning groove, and the pressing plate and the die sleeve are fixedly connected by screws.

[0013] The split lower die for pre-forging of the shaft head provided by the present utility model is designed into two parts, namely a die sleeve and a die core. After the service life of the die ends, only the die core needs to be replaced, and the die sleeve can be reused. It can be seen that this solution can reduce the consumption of die materials, improve the utilization rate of die materials, improve the processing efficiency of the die, and at the same time reduce the heat treatment and nitriding costs during die processing, thereby reducing the comprehensive cost of the die.

[0014] The die core of the present utility model is assembled up and down by a first die core and a second die core. This solution is because the working position of the first die core is more damaged and has a shorter service life. Therefore, the first die core consumes more than the second die core. When the service life of the first die core ends while the second die core can still be used, only the first die core needs to be replaced, further improving the utilization rate of die materials.

[0015] As can be seen from the above, compared with the prior art, the present utility model effectively improves the utilization rate of die materials and reduces the die cost. Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the present utility model;

[0017] Figure 2 is a front sectional view of the die sleeve of the present utility model;

[0018] Figure 3 is a bottom view of the die sleeve of the present utility model;

[0019] Figure 4 is a front sectional view of the first die core of the present utility model;

[0020] Figure 5 is a top view of the first die core of the present utility model;

[0021] Figure 6 is a front sectional view of the second die core of the present utility model;

[0022] Figure 7 is a bottom view of the second die core of the present utility model;

[0023] Figure 8 is a structural schematic diagram of the pressing plate of the present utility model.

[0024] In the figure, the corresponding relationship between the component names and the drawing numbers is as follows:

[0025] 1. Die sleeve; 101. Inner cavity; 102. First screw hole; 103. First positioning groove; 2. First die core; 21. Working part; 22. Connecting part; 201. First working cavity; 202. Second screw hole; 3. Second die core; 301. Connecting hole; 302. Bracket positioning hole; 303. Second working cavity; 304. Third screw hole; 305. Second positioning groove; 4. Pressure plate. Detailed implementation mode

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0027] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] The present invention provides a split lower die for pre-forging of shaft heads, including a die sleeve 1, a first die core 2, a second die core 3, and a pressure plate 4.

[0030] Refer to the attached Figure 2 and the attached Figure 3 . The die sleeve 1 is a frustum structure with a smaller upper part and a larger lower part, and a frustum-shaped inner cavity 101 with a smaller upper part and a larger lower part is opened in the die sleeve 1.

[0031] Refer to the attached Figure 4 and attached Figure 5 。The first die core 2 includes a working part 21 and a connecting part 22. The working part 21 is a frustum structure with a smaller upper part and a larger lower part. The connecting part 22 is a cylindrical structure, and the diameter of the connecting part 22 is smaller than the end face diameter of the working part 21. The working part 21 and the connecting part 22 are integrally processed, and the connecting part 22 is located below the working part 21. The first die core 2 is provided with a first working cavity 201 that penetrates through the working part 21 and the connecting part 22.

[0032] Refer to the attached Figure 6 and attached Figure 7 。The second die core 3 is a frustum structure with a smaller upper part and a larger lower part. The upper end face of the second die core 3 is provided with a connecting hole 301 that is in interference fit with the connecting part 22. The lower end face of the second die core 3 is provided with a bracket positioning hole 302. The second die core 3 is provided with a second working cavity 303, and the upper and lower ends of the second working cavity 303 penetrate through the connecting hole 301 and the bracket positioning hole 302 respectively.

[0033] Refer to the attached Figure 1 。The first die core 2 is tightly connected above the second die core 3 through the interference fit between the connecting part 22 and the connecting hole 301. The first die core 2 and the second die core 3 are in interference fit with the upper and lower parts of the inner cavity 101 in sequence. In the assembled state, the lower end face of the die sleeve 1 and the lower end face of the second die core 3 are in the same plane.

[0034] As can be seen from the above, the solution of the present utility model adopts a structure in which the die sleeve 1 and the die core are assembled separately; when the die life ends, only the die core needs to be replaced, and the die sleeve 1 can be reused. This solution can reduce the consumption of die materials, improve the utilization rate of die materials, improve the processing efficiency of the die, and at the same time reduce the heat treatment and nitriding costs during die processing, thereby reducing the comprehensive cost of the die. Among them, the die core is assembled up and down into a first die core 2 and a second die core 3. This solution is because the working position of the first die core 2 has a higher damage rate and a shorter life, so the first die core 2 consumes more than the second die core 3. When the life of the first die core 2 ends while the second die core 3 can still be used, only the first die core 2 needs to be replaced, further improving the utilization rate of die materials.

[0035] The upper end surface of the mold sleeve 1 is provided with first screw holes 102 distributed in a ring. The upper end surface of the first mold core 2 is provided with second screw holes 202 distributed in a ring. The lower end surface of the second mold core 3 is provided with third screw holes 304 distributed in a ring. The first screw holes 102, the second screw holes 202 and the third screw holes 304 are of the same standard thread specifications. It can be seen that the first screw hole 102 of the mold sleeve 1, the second screw hole 202 of the first mold core 2 and the third screw hole 304 of the second mold core 3 can all be connected with bolts of the same standard thread specifications. By pulling the bolts with a mechanical tool, the interference-fitted first mold core 2 and the second mold core 3 can be extracted and disassembled from the mold sleeve 1. Similarly, the first mold core 2 and the second mold core 3 that are interference-fitted together can also be extracted and disassembled by pulling the bolts. The operation is simple and convenient.

[0036] The lower end surface of the mold sleeve 1 is provided with an annular array of first positioning grooves 103, one end of which extends through the inner cavity 101. The lower edge of the second mold core 3 is provided with an annular array of second positioning grooves 305, which extend through the side of the second mold core 3. In the assembled state, the pressure plate 4 is positioned within the first and second positioning grooves 103 and 305, and is secured to the mold sleeve 1 via screws. This prevents the mold core from falling off the mold sleeve 1 due to unexpected circumstances or other unforeseen circumstances.

[0037] The specific usage and function of this embodiment are as follows:

[0038] First, insert the first mold core 2 through the connecting portion 22 into the connecting hole 301 of the second mold core 3, so that the first mold core 2 and the second mold core 3 are interference-fitted together. Then, insert the assembled mold core through one end of the first mold core 2 from the larger diameter end of the mold sleeve 1 into the inner cavity 101, so that the mold core and the mold sleeve 1 are interference-fitted together. Next, place the pressing plate 4 into the first positioning groove 103 and the second positioning groove 305, and tighten the screws to fasten the pressing plate 4 and the mold sleeve 1 together, completing the assembly of the lower mold. When in use, the assembled lower mold is mounted on the universal pre-forging lower mold bracket through the bracket positioning hole 302.

[0039] When replacing the mold core, first turn the screws at the disassembly and cleaning pressing plate 4 to remove the pressing plate 4 from the first positioning groove 103 and the second positioning groove 305. Then install bolts at the first screw hole 102 and the third screw hole 304. After that, use mechanical tools to pull the bolt at the first screw hole 102 at one end and the bolt at the third screw hole 304 at the other end, and pull the mold sleeve 1 and the combined mold core in opposite directions to extract and disassemble the combined mold core from the mold sleeve 1. If the service lives of both the first mold core 2 and the second mold core 3 are over, the combined mold core can be scrapped together, and the new combined mold core can be assembled with the mold sleeve 1 according to the above operations. If only one of the first mold core 2 and the second mold core 3 is scrapped, install a bolt at the second screw hole 202. Then use mechanical tools to pull the bolt at the second screw hole 202 at one end and the bolt at the third screw hole 304 at the other end, and pull the first mold core 2 and the second mold core 3 in opposite directions to separate them. Then scrap the mold core with the ended service life, and press-fit the new mold core with the mold core with the remaining service life not ended. Then repeat the above process to assemble the combined mold core with the mold sleeve 1.

[0040] In summary, compared with the prior art, the utility model effectively improves the utilization rate of mold materials and reduces the mold cost.

Claims

1. A split lower die for pre-forging of shaft heads, characterized in that, It includes a die sleeve (1), a first die core (2) and a second die core (3). The die sleeve (1) is in the shape of a frustum with a smaller upper part and a larger lower part. An inner cavity (101) in the shape of a frustum with a smaller upper part and a larger lower part is provided inside the die sleeve (1). The first die core (2) includes a working part (21) and a connecting part (22). The working part (21) is in the shape of a frustum with a smaller upper part and a larger lower part. The connecting part (22) is in the shape of a cylinder, and the diameter of the connecting part (22) is smaller than the end face diameter of the working part (21). The working part (21) and the connecting part (22) are integrally processed, and the connecting part (22) is located below the working part (21). A first working cavity (201) penetrating through the working part (21) and the connecting part (22) is provided in the first die core (2). The second die core (3) is in the shape of a frustum with a smaller upper part and a larger lower part. A connecting hole (301) for interference fit with the connecting part (22) is provided on the upper end face of the second die core (3). A support positioning hole (302) is provided on the lower end face of the second die core (3). A second working cavity (303) is provided in the second die core (3), and the upper and lower ends of the second working cavity (303) penetrate through the connecting hole (301) and the support positioning hole (302) respectively. The first die core (2) is tightly connected above the second die core (3) through the interference fit between the connecting part (22) and the connecting hole (301). The first die core (2) and the second die core (3) are in interference fit with the upper and lower parts of the inner cavity (101) in sequence. In the assembled state, the lower end faces of the die sleeve (1) and the second die core (3) are in the same plane.

2. The split lower die for pre-forging of the shaft head according to claim 1, characterized in that, A first screw hole (102) distributed in a ring array is provided on the upper end face of the die sleeve (1). A second screw hole (202) distributed in a ring array is provided on the upper end face of the first die core (2). A third screw hole (304) distributed in a ring array is provided on the lower end face of the second die core (3). The first screw hole (102), the second screw hole (202) and the third screw hole (304) have the same standard thread specification.

3. The split lower die for pre-forging of shaft heads according to claim 1, characterized in that It further includes a pressing plate (4). A first positioning groove (103) distributed in a ring array is provided on the lower end face of the die sleeve (1), and one end of the first positioning groove (103) communicates with the inner cavity (101). A second positioning groove (305) distributed in a ring array is provided on the edge of the lower end face of the second die core (3), and the second positioning groove (305) penetrates through the side face of the second die core (3). In the assembled state, the pressing plate (4) is located in the first positioning groove (103) and the second positioning groove (305), and the pressing plate (4) and the die sleeve (1) are tightly connected by screws.

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