Closed Extrusion Forging Technology of Single-throw All-fiber Crankshaft Forging

Abstract

The invention discloses a closed type extrusion forging technology of a complete fiber single-throw crankshaft forge piece. The closed type extrusion forging technology comprises the following steps: medium frequency induction heating, production of a workblank through rolling of a circular blank in a cross wedge rolling machine through a cross wedge rolling die, and closed type extrusion finish forging including placing the rolled workblank in a closed type extrusion finish forging die; when an upper die (1) and a lower die (2) are closed, a left jacking rod (3) and a right jacking rod (4) move to the middle part simultaneously, and meanwhile, a middle sliding block (5) moves forwards along a groove, so as to extrude the workblank in the cavity of the closed type extrusion finish forging die until a workpiece is formed; the left jacking rod (3), the right jacking rod (4) and the middle sliding block (5) rapidly return to the starting positions, the upper die (1) is opened and the workpiece is taken out. According to the invention, no boomerang, side shearing equipment or process is required, part of the metal fibers of the forge piece is not damaged, and the degree of mechanization of the forge piece is high; with additional arrangement of the middle sliding block and the groove, the extrusion forging forming of the crank throw part of which some material is not symmetrically distributed is realized, and the bottleneck, which restricts the development of the crank throw for a long time, is broken through.

Description

technical field [0001] The invention relates to a metal plastic forming process in the technical field of material processing, in particular to a closed-type extrusion forging method for a single-crank all-fiber crankshaft forging. Background technique [0002] The single-throw crankshaft is the core part of small gasoline engines and motorcycle engines, and has very high requirements on the quality of forging blanks and the flow direction of metal fibers. The traditional forging process is: blanking → heating → pulling out one end of the rod → pulling out the other end of the rod → pre-forging → final forging → trimming → inspection and storage; using the traditional process for production, due to the large amount of flying parts produced during the final forging of forgings The edge is cut off after the trimming process, so that part of the metal fiber of the finished forging is cut off, thereby reducing the mechanical properties of the forging. [0003] On June 5, 2013, ...

AI Technical Summary

Problems solved by technology

In order to realize the crank throw in the middle of the forging, this method adopts the process of bending first and then upsetting, and correspondingly needs to design the bending die and the upsetting die. The purpose of bending is to realize the asymmetric distribution of the part of the crank throw, but it increases the mold cost. and processing procedures, reducing production efficiency, but at present, the bending process before upsetting and extrusion of crankshafts is still an indispensable process, and it is also an insurmountable bottleneck restricting the development of crankshafts

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