Gear precision plastic forming process and its forming mould

A technology of plastic forming and gear shape, which is applied in the field of gear precision plastic forming technology and its gear precision plastic forming mold, which can solve the problems of short mold life, difficulty in filling the tooth shape, and reducing the mechanical properties of the product, so as to avoid tooth root scratches , The effect of facilitating tooth root forming

Inactive Publication Date: 2005-06-29
ZHONGBEI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This process has the following disadvantages: large blank cutting volume, low productivity, low material utilization rate, only 30-50%; large energy consumption, serious environmental pollution; many workpiece turnover times, long production cycle, high production cost; The streamline of the forging structure is cut off and the structure is coarse, which reduces the mechanical properties of the product; it is difficult to process new gears such as backlash-free transmission gears and non-cylindrical gears
When used to manufacture gears with large modulus, long tooth shape, and large diameter, the forming force and demoulding force are large, the life of the mold is short, the tooth shape is difficult to fill, and the tooth shape accuracy cannot be guaranteed. The larger the diameter, the more obvious the above disadvantages

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  • Gear precision plastic forming process and its forming mould
  • Gear precision plastic forming process and its forming mould
  • Gear precision plastic forming process and its forming mould

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Embodiment Construction

[0072] The gear precision plastic forming die of the present invention has four kinds of first-stage warm extrusion forming dies, second-stage warm extrusion forming dies, pushing shaping dies and cold shaping dies.

[0073] See figure 1 , Fig. 2, it has a die body 1, has the gear-shaped cavity 2 that the two ends of the contour of the gear part shape are communicated in the die body 1, and the tooth-shaped concave corresponding to the tooth shape of the gear part is distributed in the inner side of the gear-shaped cavity 2 The groove 3 and the gear-shaped cavity 2 only have the feed section 5, the axial diversion angle β1 of the addendum 5 of the feed section 5 is 0.5-30° such as 10°, and the radial diversion angle α1 is 0.5-30° such as 10°, see image 3 , The tooth profile area of ​​the discharge side of the primary warm extrusion die is 5% to 40% larger than the tooth profile area required by the gear parts, such as 15%.

[0074] The embodiment of the two-stage warm extru...

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Abstract

The invention belongs to a gear precision plastic forming process and a forming die thereof. The forming die has a gear-shaped cavity with a profile of a gear part. The gear-shaped cavity has a feed section with an inclined top and root, a sizing section similar to the gear part, and a discharge section with an inclined top and root. The forming process is to put the heated blanks into different gear plastic precision molds one by one, carry out warm extrusion to form gear blanks, and process the teeth of the gear blanks by shaping, cold shaping or shaving. The forming process and the forming die thereof have small forming force, good forming quality, high production efficiency and low cost.

Description

technical field [0001] The invention belongs to a gear precision plastic forming process and a gear precision plastic forming die. Background technique [0002] The existing gear processing technology mainly adopts the traditional technology, which has been used for many years. The process steps are: blanking - high temperature forging blank - heat treatment - tooth shape and shape cutting processing - (carburizing), quenching, Tempering - Finishing after heat treatment. This process has the following disadvantages: large blank cutting volume, low productivity, low material utilization rate, only 30-50%; large energy consumption, serious environmental pollution; many workpiece turnover times, long production cycle, high production cost; The streamline of the forging structure is cut off and the structure is coarse, which reduces the mechanical properties of the product; it is difficult to process new gears such as backlash-free transmission gears and non-cylindrical gears. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/14B21C25/02
Inventor 张治民张宝红李保成方敏王强冯再新
Owner ZHONGBEI UNIV
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