Thermal precise forming method and device for toothed steering rocker arm shaft

Abstract

The invention discloses a thermal precise forming method and a thermal precise forming device for a toothed steering rocker arm shaft. The method is characterized in that: a toothed steering rocker arm shaft precision forging is formed by a one-step method in a forming mode of positive extrusion upsetting and lateral extrusion; and the method comprises the following steps that: a metal blank is put into a female die and an extrusion upsetting sleeve, a sliding block of a hydraulic press starts descending, an upper punch head starts contacting and extruding the metal blank, the metal blank flows into the fan-shaped cavity of the female die under the extrusion of the upper punch head, a lateral hydraulic cylinder starts pressing when the fan-shaped cavity is full of the metal blank so as to drive a lateral toothed punch head to extrude the metal blank flowing into the fan-shaped cavity, the pressure and the stroke of the sliding block of the hydraulic press and the lateral hydraulic cylinder are numerically controlled, and the toothed steering rocker arm shaft precision forging is extruded under the combined action of the upper punch head and the toothed punch head. The method has the characteristics of one-step formation, simple process and short flow, and fulfills the purposes of high efficiency, energy conservation and material economization of precise forming.

Description

technical field [0001] The invention belongs to a precision forming process and a device thereof in the machinery manufacturing industry, in particular to a tooth-shaped steering rocker shaft thermal precision forming method and a device thereof, which are suitable for the production of complex tooth-shaped special-shaped parts. Background technique [0002] The toothed steering rocker shaft is a special-shaped toothed part with a sector (such as figure 1 , 2 As shown), it is an important part in the automobile steering gear. With the rapid development of the automobile industry, the demand is increasing. [0003] Because such parts are special-shaped parts with fan-shaped blocks, the general processing methods (including FAW, No. 2 Automobile and foreign manufacturers) use hot die forging to produce metal blank forgings and then cut them to form tooth shapes. Since this type of part is a special-shaped part, a large flash will be generated during die forging and a large ...

AI Technical Summary

Problems solved by technology

In 1992, Zhengzhou Machinery Research Institute developed a new process of extruding and forming rocker shafts (patent number: ZL93221828.8), and successfully produced metal blank forgings of rocker shafts without flash. It is a great progress, realizing flash-free forging, which can save 30% of materials, but finishing processing is still required

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