Rotary shaft forging die

Abstract

The utility model relates to the technical field of forging, in particular to a rotary shaft forging die. Comprising a combined lower die and a combined upper die, a forming groove is formed in the upper surface of the combined lower die, a lower shaft hole is formed in the bottom face of the forming groove, a guide cylinder is further arranged on the upper surface of the combined lower die, the extending direction of the guide cylinder is parallel to the extending direction of the lower shaft hole, and an upper shaft hole penetrating through the bottom face of the combined upper die is formed in the combined upper die. And the guide cylinder is used for being matched with the lower part of the combined upper die so as to play a guiding role.

Description

Technical Field

[0001] This utility model relates to the field of forging technology, and in particular to a rotary shaft forging die. Background Technology

[0002] Forging is divided into free forging and die forging. Die forging requires the use of dies to shape the forging into the desired shape. Patent application number 202020645797.1 discloses a rotary shaft forging die, including a die body. The die body includes a horizontally arranged lower die and an upper die detachably connected to the upper surface of the lower die. A forming groove is vertically formed on the upper surface of the lower die, and a lower shaft hole is vertically and coaxially formed at the center of the forming groove. An upper shaft hole is vertically formed through the upper die. The upper shaft hole and the lower shaft hole are coaxial and have the same diameter. An air venting groove is formed in the forming groove. It has the effect of effectively improving the forming quality of the rotary shaft. However, in actual use, the hammer of the forging equipment applies pressure to the upper end of the bar stock placed in the upper shaft hole and the lower shaft hole. Due to the large friction between the upper shaft hole and the bar stock, a large part of the pressure applied by the hammer is used to overcome this friction and is greatly consumed. Moreover, the bar stock is relatively soft, so the bar stock exposed above the upper shaft hole tends to thicken above the upper shaft hole and is not easy to enter the upper shaft hole. As a result, it is difficult for the bar stock to deform and fill the forming groove, and the time required is long. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a rotary shaft forging die, which addresses the above-mentioned technical deficiencies.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a rotary shaft forging die, including a combined lower die and a combined upper die. The upper surface of the combined lower die is provided with a forming groove, and the bottom surface of the forming groove is provided with a lower shaft hole. The upper surface of the combined lower die is also provided with a guide cylinder, the extension direction of which is parallel to the extension direction of the lower shaft hole. The combined upper die is provided with an upper shaft hole penetrating its bottom surface. The guide cylinder is used to cooperate with the lower part of the combined upper die to play a guiding role.

[0005] To further optimize this technical solution, the combined lower mold includes two identical lower mold halves, the parting surface of which passes through the axis of the lower shaft hole, and side plates are provided on both sides of the two lower mold halves, with a first through hole provided on the side plates.

[0006] To further optimize this technical solution, the combined upper mold includes two half upper molds. The parting surfaces of the two half upper molds pass through the axis of the upper shaft hole. One half upper mold has multiple threaded holes on its parting surface, and the other half upper mold has second through holes corresponding to the multiple threaded holes. A groove is provided on the side of the second through hole away from the parting surface.

[0007] To further optimize this technical solution, the upper opening of the guide cylinder is provided with a chamfer.

[0008] Compared with the prior art, the present invention has the following advantages: it is composed of a combined lower mold and a combined upper mold, the forming groove and the lower shaft hole are set on the combined lower mold, the upper shaft hole is set on the combined upper mold, the forming groove penetrates the upper surface of the combined lower mold, the upper shaft hole penetrates the lower surface of the combined upper mold, and a guide cylinder is provided on the upper surface of the combined lower mold, which makes it easier for the bar to deform and fill the forming groove. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a rotary shaft forging die.

[0010] Figure 2 This is a schematic diagram of the combined lower mold structure.

[0011] Figure 3 This is an exploded view of the combined upper mold.

[0012] In the diagram: 1. Combined lower mold; 11. Lower shaft hole; 12. Forming groove; 13. Half lower mold; 131. Side plate; 14. Guide cylinder; 141. Chamfer; 2. Combined upper mold; 21. Upper shaft hole; 22. Half upper mold; 221. Threaded hole; 222. Groove; 223. Second through hole. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0014] Detailed implementation method: combined with Figure 1-3As shown, a rotary shaft forging die includes a combined lower die 1 and a combined upper die 2. The upper surface of the combined lower die 1 is provided with a forming groove 12 for forming a disc on the rotary shaft. The bottom surface of the forming groove 12 is provided with a lower shaft hole 11 for forming the lower shaft body of the rotary shaft. The upper surface of the combined lower die 1 is also provided with a guide cylinder 14, the extension direction of which is parallel to the extension direction of the lower shaft hole 11. The combined upper die 2 is provided with an upper shaft hole 21 penetrating its bottom surface for forming the upper shaft body of the rotary shaft. The guide cylinder 14 is used to cooperate with the lower part of the combined upper die 2 to provide a guiding function. In use, first prepare a bar stock of the appropriate size. The diameter of the bar stock is slightly smaller than the diameter of the lower shaft hole 11 and the upper shaft hole 21. The weight of the bar stock is equal to or slightly greater than the weight of the rotary shaft, so the length of the bar stock is much greater than the length of the rotary shaft. First, place the combined lower die 1 on the worktable (anvil) of the forging equipment. Then, insert the heated bar stock into the lower shaft hole 11 (to the bottom). At this time, the upper part of the bar stock protrudes more from the lower shaft hole 11. Then, place the combined upper die 2 on the top of the bar stock and insert the upper end of the bar stock into the upper shaft hole 21 (to the bottom). At this time, the lower part of the combined upper die 2 is inserted into the guide cylinder 14, and the bottom surface of the combined upper die 2 is a certain distance away from the top surface of the combined lower die 1. Then, start the forging equipment. The hammer of the forging equipment applies pressure to the top surface of the combined upper die 2, so that the bar stock fills the lower shaft hole 11 and the upper shaft hole 21, and the bar stock located between the combined lower die 1 and the combined upper die 2 fills the forming groove 12. Then, demold to obtain the required rotary shaft. Since the upper mold 2 is a rigid body, the force of the hammer can be easily transmitted through the upper mold 2 to the position of the disc on the forming shaft of the bar stock, so that the bar stock can be easily deformed to fill the forming groove 12.

[0015] Furthermore, the combined lower die 1 includes two identical lower die halves 13. The parting surfaces of the two lower die halves 13 pass through the axis of the lower shaft hole 11. Side plates 131 are provided on both sides of each lower die halves 13. Each side plate 131 has a first through hole, through which bolts can be passed and connected to nuts, thereby fixing the two lower die halves 13 together. After forging is completed, the bolts and nuts can be removed to separate the two lower die halves 13, facilitating demolding.

[0016] Furthermore, the combined upper die 2 includes two half-upper dies 22, the parting surfaces of which pass through the axis of the upper shaft hole 21. One half-upper die 22 has multiple threaded holes 221 on its parting surface, and the other half-upper die 22 has second through holes 223 corresponding to the multiple threaded holes 221. A groove 222 is provided on the side of the second through hole 223 away from the parting surface, allowing bolts to pass through the second through hole 223 and connect to the threaded holes 221, thereby fixing the two half-upper dies 22 together. After forging is completed, the bolts can be removed to separate the two half-upper dies 22, facilitating demolding.

[0017] Furthermore, the upper opening of the guide cylinder 14 is provided with a chamfer 141, which makes it easier for the combined upper mold 2 to be inserted into the guide cylinder 14.

[0018] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotary shaft forging die, comprising a combined lower die (1) and a combined upper die (2), characterized in that: The upper surface of the combined lower mold (1) is provided with a forming groove (12), the bottom surface of the forming groove (12) is provided with a lower shaft hole (11), the upper surface of the combined lower mold (1) is also provided with a guide cylinder (14), the extension direction of the guide cylinder (14) is parallel to the extension direction of the lower shaft hole (11), the combined upper mold (2) is provided with an upper shaft hole (21) penetrating its bottom surface, and the guide cylinder (14) is used to cooperate with the lower part of the combined upper mold (2) to play a guiding role.

2. The rotary shaft forging die according to claim 1, characterized in that: The combined lower mold (1) includes two identical lower mold halves (13), the parting surfaces of the two lower mold halves (13) pass through the axis of the lower shaft hole (11), and side plates (131) are provided on both sides of the two lower mold halves (13), and a first through hole is provided on the side plates (131).

3. The rotary shaft forging die according to claim 1, characterized in that: The combined upper mold (2) includes two half upper molds (22). The parting surfaces of the two half upper molds (22) pass through the axis of the upper shaft hole (21). One half upper mold (22) has multiple threaded holes (221) on its parting surface, and the other half upper mold (22) has a second through hole (223) corresponding to the multiple threaded holes (221) respectively. The second through hole (223) has a groove (222) on the side away from the parting surface.

4. A rotary shaft forging die according to any one of claims 1-3, characterized in that: The upper opening of the guide cylinder (14) is provided with a chamfer (141).

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