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A kind of precision plastic forming method of bevel gear

A plastic forming and bevel gear technology, applied in the direction of wheels, transportation and packaging, metal processing equipment, etc., can solve the problems of unstable forming, low precision of forgings, uneven filling, etc., to achieve short metal flow distance, improve mold life, The effect of improving product quality

Active Publication Date: 2020-05-19
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] Aiming at the deficiencies of the prior art, the purpose of the present invention is to propose a precision plastic forming method for bevel gears to solve the problems in the prior art that the shape design of bevel gear preforms relies on experience, the forming is unstable, the filling is uneven, and the forgings Low precision, low mold life and other problems have realized the precision plastic forming of bevel gears

Method used

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  • A kind of precision plastic forming method of bevel gear
  • A kind of precision plastic forming method of bevel gear
  • A kind of precision plastic forming method of bevel gear

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Embodiment Construction

[0061] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0062] Such as figure 1 As shown, a precision forging of a bevel gear, the number of teeth z is 30, the modulus of the big end is m e is 2.5, the tooth width b is 15mm, and the sub-cone angle δ is 75°. When the cylindrical blank is directly formed, the tooth shape is difficult to fill, which affects the product quality. In order to solve this technical problem, the precision plastic forming method of the bevel gear as described below is adopted.

[0063] Blanking and billet pretreatment:

[0064] The surface of the 20CrMnTi round bar is peeled as Sawing and blanking a 15mm high bar to obtain a cylindrical blank of the required specification, and then performing phosphorus saponification lubrication and softening annealing treatment as required...

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Abstract

The invention discloses a precision plastic forming method for a bevel gear, and belongs to the technical field of metal plastic forming. The method comprises the following steps that characterizationparameters of a bevel gear fine forging piece are obtained; wavy line parameters of the big end and the small end of the bevel gear fine forging piece are obtained according to the characterization parameters; pre-forging die manufacturing is conducted according to the wavy line parameters; a cylinder blank is placed in a pre-forging die, closed die forging is conducted, and a pre-formed piece isobtained; and the pre-formed piece is placed in a finish forging die, blocking upset-extruding forming of a tooth profile part is conducted, and a bevel gear fine forging piece with the integral tooth profile is obtained. By means of the precision plastic forming method, the metal filling capability is improved, the metal filling load requirement is reduced, the die stress is reduced, and the service life of the die is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular relates to a precision plastic forming method of bevel gears. Background technique [0002] Bevel gears can realize the transmission of intersecting axes, and are widely used in the transmission systems of automobiles, machinery and machine tools. The traditional manufacturing method is to use bar billet or die forging billet, and then use the profiling milling method, generating tooth planing method, etc. to cut the tooth shape. The production of bevel gears by cutting processing requires tooth-by-tooth forming, which not only has low production efficiency and low material utilization rate; but also cuts off the metal streamline of the rolled billet or die forging billet, which reduces the bevel gear. Fatigue strength and service life. [0003] The plastic forming method is to use a press to force the metal to flow in the mold to obtain a high-precision tooth pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J5/08B21K1/30
Inventor 李振红查光成黄英娜赵伟谢斌袁天宇王瑶
Owner NANJING INST OF TECH
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