Manufacturing device for plate-shaped toothed parts

Abstract

[Problem] To present a manufacturing apparatus of a plate-like tooth profile member capable of forging and forming in one process by using a closed type die, being hardly accompanied by burrs due to plastic changes in the circumferential direction and in the axial direction of the material of the plate-like tooth profile member. [Solving Means] Consisting of an upper die 1 and a lower die 2 of closed type, the lower die 2 is composed of a tooth die 21 for forming a tooth portion in a material W of a plate-like tooth profile member, and movable dies 22, 22 movable relatively in a vertical direction to the tooth die 21 disposed at both sides in the axial direction of the material W of the plate-like tooth profile member of the tooth die 21, a first stroke is executed for confining the circumference at both end portions in the axial direction of the material W of the plate-like tooth profile member by the upper die 1 and the movable dies 22, 22, and a second stroke is executed for forming a tooth portion in the material W of the plate-like tooth profile member by the upper die 1 and the tooth die 21.

Description

technical field [0001] The present invention relates to a manufacturing device of a plate-shaped tooth-shaped part, and in particular to a manufacturing device of a plate-shaped tooth-shaped part composed of an upper mold and a lower mold of a closed type. Background technique [0002] In the past, forging was performed in one process using a closed mold, and at the same time, the manufacturing of steering racks (for example, complex-shaped and variable steering racks) that were deburred after forging and forming products could be reduced as much as possible The method and apparatus have been proposed by the applicant of the present invention and are being put into practical use (for example, Patent Document 1). [0003] However, in the steering rack manufacturing apparatus described in Patent Document 1, forging is performed using a closed die formed so as to absorb the overflow of the blank due to plastic deformation in accordance with the shape of the steering rack to be ...

AI Technical Summary

Problems solved by technology

[0004] However, in the manufacturing apparatus of the above-mentioned steering rack, since the upper mold and the lower mold are each composed of an integral mold, it is not possible to align the upper mold and the lower mold from the beginning of the process of forming the teeth on the steering rack blank. As a result of the constraints on the peripheral surfaces of both axial ends of the steering rack material, there is a problem that the material of the tooth part forming part of the steering rack material overflows to the end parts in the axial direction of the steering rack material, The burr occurs at its position or the material of the tooth part forming part of the steering rack blank is insufficient, the yield of the product is reduced, and the forming accuracy of the product is reduced.

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