Method for forging thin and short shaft section at end of large-scale step shaft

Abstract

The invention discloses a method for forging a thin and short shaft section at the end of a large-scale step shaft. The method comprises the following steps of: (A) forging a pre-forging part and separating a material for the thin and short shaft section (3) of the pre-forging part; (B), drawing a small step section (2) out to obtain the thin and short section (3) of the pre-forging part; (C) upsetting a large step section (1) in a molding bed; and (D) stripping a mold, and drawing the thin and short shaft section (3) of the pre-forging part and the large step section (1) out to process dimensions so as to forge the thin and short shaft section at the end of the large-scale step shaft. The forging method of the invention is different from a conventional forging method from a large diameter to a small diameter, and solves the problem that the thin and short shaft section at the end of the large-scale step shaft cannot be formed because of the insufficiency of material distribution. A step shaft product produced by the method has continuous forging streamlines, reasonable distribution, stable quality and great reduction of blanking weight of a forge piece. The forging method of the invention is simple and easy to implement, the quality is reliable and the raw material utilization ratio is high.

Description

technical field [0001] The invention relates to a forging method, in particular to a forging method for a thin and short shaft section at the end of a large stepped shaft, which belongs to the technical field of free forging. Background technique [0002] The stepped shaft is a common free forging. The general shape is a large diameter section in the middle and small diameter sections at both ends, such as rotors, rolls, etc.; or a large flange at one end and a small diameter shaft section at the other end, such as wind power spindles and stern shafts. Wait. Some step shafts are too thin and short because of the size of the steps at the end. When the material is divided before drawing, the length of the material will be shorter than 1 / 3 of the diameter of the material. In this way, when the thin shaft section of the preform is drawn The concave center seriously affects the size and quality of forgings. [0003] The general forging method of the existing large-scale stepped...

AI Technical Summary

Problems solved by technology

Some step shafts are too thin and short because of the size of the steps at the end. When the material is divided before drawing, the length of the material will be shorter than 1 / 3 of the diameter of the material. In this way, when the thin shaft section of the preform is drawn The concave center seriously affects the size and quality of forgings

[0003] The general forging method of the existing large-scale stepped shaft with a thin and short shaft section is: first, the steel ingot is upset and drawn to a preform with a diameter greater than D, where D is the diameter of the large stage of the forging after forming, and then, the material is divided and pressed out to form a preform. The short shaft section a of the billet, but because the weight of the short shaft section a of the preform is too small, the parting length is too short, so it cannot be pulled out smoothly

The current solution is to increase the remaining blocks or add process accessories to increase the length of the material, but this causes a great waste of raw materials and increases the cost of machining

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