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Fan-shaped forged piece and precision forging process for same

A fan-shaped and forging technology is applied in the field of forging billet manufacturing of a fan-shaped worm gear, one of the parts.

Inactive Publication Date: 2013-05-01
QINHAN PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing worm wheel forging structure and the existing fan-shaped forging manufacturing process used in high-voltage switch products are not reasonable enough

Method used

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  • Fan-shaped forged piece and precision forging process for same
  • Fan-shaped forged piece and precision forging process for same
  • Fan-shaped forged piece and precision forging process for same

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Embodiment Construction

[0031] Choose Φ55 mm aluminum bronze bars to be cut with a band saw to control the cutting length and weight. The material length of the large-angle 135° sector worm wheel is 118+0.5mm, and the weight is 2.10~2.11 kg. The material length of the small-angle 120° sector worm wheel is 97+0.5mm and the weight is 1.71~1.72 kg. The diameter of the bar is directly related to whether the plastic deformation of the pre-formed filling is appropriate or not. Choose the appropriate diameter bar. During the pre-formed filling, the deformation of the bar is moderate during self-distribution without tearing and folding. When the weight error caused by the end face is small, it is beneficial to closed die forging. If the diameter is too small, the length of the material will be longer. First, the deformation of the material during forging is too large, which increases the difficulty of processing; second, the length of the mold is fixed, and the material with a large length will be difficult t...

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Abstract

The invention discloses a precision forging process for a fan-shaped forged piece. The fan-shaped forged piece is a fan-shaped worm gear which is one of parts in a high-voltage switch operating mechanism. The precision forging process comprises a step of preparing a bar stock; a step of heating the bar stock to 760 to 900 DEG C; a step of placing the bar stock into a pre-forming die, and forming pre-formed blank; a step of heating the pre-formed blank to 760 to 900 DEG C; and a step of placing the pre-formed blank into a final forming die, and forming a finally formed blank fan-shaped worm gear with an outer-circle flange and a center hole. The invention also discloses a large-angle fan-shaped worm gear and a small-angle fan-shaped worm gear, which are forged by the process, wherein the large-angle fan-shaped worm gear has a sector angle of 135 degrees, and the small-angle fan-shaped worm gear has a sector angle of 120 degrees. The fan-shaped worm gear is manufactured according to an actual operation fixing working angle of the worm gear, so that the material consumption of the precision forging process is remarkably reduced compared with that of the conventional integral round worm gear; and a product forged by the process is high in material density, neat and attractive in appearance, free of burr and flashing, low in machining allowance, material-saving and favorable for machining.

Description

technical field [0001] The invention relates to the technical field of precision warm forging, and in particular to a forging and blank-making process of a fan-shaped worm wheel, one of the parts in a high-voltage switch operating mechanism. Background technique [0002] At present, the manufacturing method of fan-shaped forgings in the industry is relatively troublesome: one process is to preform the bar material twice, and then use open die forging to final forge the preformed intermediate blank; the other process is to make the bar material The blank is pre-forged by free forging, and after forging, the pre-formed intermediate blank is finally forged by open die forging. These two processes are cumbersome, the precision of forgings is poor, the flash and burrs are large, and the material consumption is high. [0003] For the high-voltage switch operating mechanism used in my country's high-voltage power transmission and transformation industry, due to various reasons, th...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21J3/00B21J13/02B21J1/06F16H55/22
Inventor 辛选荣贺成松刘新成史志欣史颂华
Owner QINHAN PRECISION IND CO LTD
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