Method for designing hot-forging die tooth form of rockshaft with teeth

Abstract

The invention discloses a method for designing a hot-forging die tooth form of a rockshaft with teeth. The method comprises the following steps that the tooth form shape is drawn according to tooth form parameters of the rockshaft, and the tooth form shape is decomposed into a part tooth crest curve a, a part involute curve b and a part tooth root curve c; the part tooth crest curve a and the part involute curve b offset outwards in an equally-spaced mode to obtain a tooth crest curve a1 and an involute curve b1; fitting is performed on the outer side of the part tooth root curve c to obtain different tooth root curves, and a tooth root curve c1 applicable to forge piece material flowing is drawn; the tooth root curve c1 and the involute curve b1 are connected into a whole in a fitting mode; gaps between the tooth crest curve a1 and the involute curve b1 are in smooth transition connection through an arc; the curve composed of the tooth crest curve a1, the involute curve b1, the tooth root curve c and the arc connecting the tooth crest curve a1 and the involute curve b1 is a die tooth form curve. According to the method, the service life of the die can be prolonged, and the tooth form working allowance is reduced.

Description

technical field [0001] The invention relates to the field of metal thermal precision forging, in particular to a tooth profile design method of a toothed rocker shaft hot forging die. Background technique [0002] The rocker shaft is one of the important parts in the steering gear of the car. Its main function is to output sufficient steering torque to ensure the normal steering of the car. It is also a key force-bearing part that passes through the intersection of the gear fan and the steering nut when the front axle of the car is impacted by external force. . This type of parts is generally produced by hot forging dies for fan-shaped forgings, and then processed into finished toothed rocker shafts by cutting. Since the rocker shaft is a special-shaped part, the die forging production has a large flash and low material utilization. In 2011, Zhengzhou Machinery Research Institute developed a tooth-shaped steering rocker shaft thermal precision forming method and its device ...

AI Technical Summary

Problems solved by technology

The mold tooth shape of this method is too precise, which can reduce the machining allowance of the tooth shape, but because the mold tooth shape is too sharp, it will cause problems such as collapse and deformation of the mold in a high-temperature and high-pressure environment, which will reduce the service life of the mold; Too rough and blunt can improve the life of the die, but the tooth profile machining allowance of the corresponding forgings will increase

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