A Closed Precision Forging Process for Stepped Shaft Blank

Abstract

The invention discloses an enclosed precision forging process for a step shaft blank. The enclosed precision forging process comprises the following steps: (1) putting a heated rod material in a lower mold core and assembling the mold; (2) when the pressure P in a mold cavity is increased to a backpressure Fs born by four upper sliders, making the four upper sliders move outwards along the radial direction; when the pressure in the mold cavity is further increased to the backpressure Fx born by four lower sliders, making the four lower sliders move outwards along the radial direction as well; (3) Fx is larger than Fs, a blank material in contact with the four upper sliders flows outwards rapidly along the radial direction, and the blank material in contact with the four lower sliders flows outwards slowly along the radial direction; (4) finally the two blank material reach a limit position at the same time or reach the limit position one after another, the four upper sliders are stopped by an upper stopping material, the four lower sliders are stopped by a lower stopping block, and then the formation is ended; and (5) opening the mold. The enclosed precision forging process disclosed by the invention can implement formation of a complex blank on one piece of equipment, and is high in production efficiency, good in forge piece streamline, good in quality and liable to realize mechanization and automation.

Description

technical field [0001] The invention relates to the technical field of metal forming, in particular to a closed precision forging process for a stepped shaft blank. Background technique [0002] The shaft is generally designed to be stepped according to its use requirements, and its blank forming methods generally include bar forging, multi-pass extrusion pier forming, cross wedge rolling forming, radial forging or rotary forging, etc. Bar forging has problems such as low efficiency and low material utilization rate. The production efficiency of multi-pass extrusion piers is low and multi-station equipment is required, while cross wedge rolling, radial forging or rotary forging all require special equipment. Contents of the invention [0003] The purpose of the present invention is to provide a closed precision forging process for stepped shaft blanks to solve the problem of low efficiency in the existing traditional forging and extrusion, but cross wedge rolling, radial f...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a closed precision forging process for stepped shaft blanks to solve the problem of low efficiency in the existing traditional forging and extrusion, but cross wedge rolling, radial forging or rotary forging require special equipment and require large investment. question

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