Drawing and forming method for deep cylindrical piece and mould thereof

Abstract

The invention discloses a drawing and forming method for a deep cylindrical piece and a mould thereof. The mould comprises a concave mould, a convex mould corresponding to the concave mould, and a side pressing ring which is arranged on the convex mould in a sleeving mode, wherein drawing threshold structures which are mutually corresponding and matched are arranged on the bottom surface of the concave mould and the surface of the side pressing ring corresponding to the bottom surface; during first-pass drawing, a product does not form a flange, so that a mouth part of a component can be effectively prevented from wrinkling during second-pass drawing. During reverse drawing, the drawing threshold structures can reduce wrinkling and burning defects, and effectively reduce side-pressing force at the same time. According to the drawing and forming method for the deep cylinderical piece and the mould thereof, during reverse drawing, a flow direction of a metal material is reverse to that of the metal material in a front drawing process, thereby facilitating mutually balancing out residual stress of drawing and forming; and a drawing coefficient of reverse drawing is smaller than that of front drawing, thereby facilitating reducing drawing times and improving forming quality.

Description

technical field [0001] The invention relates to the field of plastic processing of mechanical engineering, in particular to a method for deep drawing and forming of a deep cylindrical part and a mold thereof. Background technique [0002] During the processing of traditional deep cylindrical parts, for products whose two-pass deep-drawing coefficient is near the material limit value, if two-pass deep-drawing is used, cracks, short materials or burn defects will often occur; if three-pass Deep drawing, although the product quality is stable, but the production cost is relatively high. [0003] In the forward and reverse drawing process of deep cylindrical parts, the forming quality of reverse drawing is affected by positive drawing. If the drawn part after positive drawing forms a flange, after reverse drawing, the mouth of the drawn part will wrinkle seriously, resulting in an increase in the reject rate. [0004] When conventional reverse drawing is used with traditional ...

AI Technical Summary

Problems solved by technology

In the traditional reverse deep drawing, the fillet radius of the die is often determined by experience, and the production efficiency is low through continuous improvement through trial dies

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