Device and method for soft mold forming of magnetorheological elastic material for variable diameter pipe

Abstract

The invention provides a soft mold forming device and method for a magnetorheological elastic material of a variable-diameter pipe, belonging to the field of pipe forming. The device comprises an upper die (3), a coil (4), a lower die (7) and a plunger (8); a coil (4) is arranged outside the upper die (3) and the lower die (7), and the upper die (3) A cavity is formed between it and the lower die (7), the cavity is used to place the tube blank (2), the tube blank (2) is filled with a non-homogeneous magnetorheological soft mold, and the non-homogeneous magnetorheological soft mold is divided into It is an upper part, a middle part and a lower part, the middle part corresponds to the variable diameter part of the tube blank (2), the upper part and the lower part are composed of type I magnetorheological elastic material (5), and the middle part is made of type II magnetorheological elastic material The material (6) is formed, and the flow stress of the I-type magnetorheological elastic material (5) is smaller than that of the II-type magnetorheological elastic material (6) under an external magnetic field. The invention solves the problems of excessively thinning of the wall thickness at the apex position of the diameter-reducing area of ​​the tube blank and the limited degree of diameter-reduction when forming the reducing-diameter pipe fittings.

Description

technical field [0001] The invention relates to a soft mold forming device and method for a magnetorheological elastic material of a variable-diameter pipe, belonging to the technical field of pipe forming. Background technique [0002] The shell part with large variable diameter per unit length is a typical part widely used in aviation, aerospace and automobile fields. The usual forming method for such parts is split forming and then combined welding. Due to the influence of the one-piece forming process, the quality control is difficult, and the welding seam seriously affects the quality and performance of the parts, increasing the manufacturing cost. With the increasing requirements for the dimensional accuracy, surface quality and manufacturing efficiency of variable diameter parts, the existing forming methods have been unable to adapt; and other one-time forming technologies (such as spinning), the forming unit length changes When the diameter is relatively large, mul...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a magneto-rheological elastic material soft mold forming device and method for reducing pipe fittings, which is used to solve the problem that the wall thickness at the apex of the reducing area of ​​the tube blank is too thin and becomes large when the existing method is used to form reducing pipe fittings. The problem of limited diameter

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