Forming die for tooth shape of spiral gear and forming method of forming die

Abstract

The invention discloses a forming die for the tooth shape of a spiral gear and a forming method of the forming die. The forming die comprises a hydraulic mechanism, an upper die mechanism and a lowerdie mechanism. The upper die mechanism comprises an upper die base, an upper die body and a pressing rod mechanism. A first through hole is formed in the center of the upper die body. The pressing rodmechanism comprises a pressing rod and a second power device. The lower die mechanism comprises a lower die base, a lower die body and an ejector rod mechanism. A containing cavity is formed in the center of the lower die body and used for storing a workpiece to be formed. The inner wall of the containing cavity is provided with a spiral tooth groove. A second through hole is formed in the centerof the bottom of the containing cavity. The ejector rod mechanism comprises an ejector rod and a third power device. The ejector rod penetrates the second through hole. According to the forming die,the manner of arranging the spiral tooth groove in the lower die body is adopted, the tooth shape of the workpiece to be formed is formed in the cold pressing forming process, in the tooth shape forming process, excessive metal moves to the middle portion of the workpiece to be formed, the problem that in the prior art, the spiral tooth groove is formed in the upper die body, and as a result, remaining materials accumulate on one end face of the workpiece is avoided, and the forming effect is improved.

Description

technical field [0001] The invention relates to the technical field of cold extrusion, in particular to a forming die of a helical gear tooth profile and a forming method thereof. Background technique [0002] Cold extrusion is the process of placing the metal blank in the cold extrusion die cavity (usually a die), at room temperature, applying pressure to the blank through the punch fixed on the press, so that the metal blank produces plastic deformation to obtain parts. method. Cold extrusion is one of the chip-free and chip-less parts processing technologies, and it is an advanced process method in metal plastic processing. Spiral bevel gears are important parts in machinery. Such parts have complex shapes and have been produced by milling. This traditional processing method has many procedures, low production efficiency, large material loss, and high cost, which is difficult to meet the needs of mass production. Cold extrusion technology has the advantages of high pro...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a helical gear tooth-shaped forming die and its forming method with simple process, good forming effect and convenient taking-out, so that the problems existing in the prior art are complex process, poor forming effect and difficult taking-out be resolved

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