Magnetorheological elastomer and hydraulic combined pipe fitting forming device and method

Abstract

The invention provides a magnetorheological elastomer and hydraulic pressure combined pipe fitting forming device and method.The forming device comprises an upper die and a lower die, a forming cavity is formed after the upper die and the lower die are combined, and the forming cavity is provided with a radial bulging section and equal-diameter sections located at the two ends of the radial bulging section; the geometric profile characteristics of the forming cavity are consistent with those of a formed pipe fitting, the equal-diameter sections are used for containing the two ends of a pipe blank, a magnetorheological elastomer is sleeved with a through hole of the pipe blank and is tubular, a through hole of the magnetorheological elastomer is used for being filled with hydraulic fluid, and an electromagnet is further arranged in the cavity wall of the forming cavity; and the electromagnet is used for adjusting the elastic modulus of the corresponding position of the magnetorheological elastomer when current is introduced. The pipe blank is formed by adopting the combination of hydraulic pressure and the magnetorheological elastomer, and the phenomenon of compression instability caused by independently adopting the magnetorheological elastomer can be effectively prevented while the forming pressure can be differentially loaded to realize the accurate forming of the local characteristics of the part.

Description

technical field [0001] The invention belongs to the technical field of flexible forming of pipe fittings, and in particular relates to a forming device and a forming method of a combined magnetorheological elastomer and hydraulic pressure pipe fitting. Background technique [0002] Internal high pressure forming technology is mainly used in the processing and manufacturing fields of aerospace, automobile industry and precision instruments. The traditional internal high pressure forming adopts the hydraulic bulging process, and the metal material is plastically deformed by passing high-pressure liquid into the tube blank, and finally the required tube parts are obtained. The hydroforming technology of pipe fittings can be divided into the traditional internal high pressure forming technology with uniform hydraulic pressure, the pulsating hydroforming technology and the impact hydroforming technology proposed in recent years. At present, each technology has been applied in the...

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Problems solved by technology

[0003] (1) Simply using the liquid internal high pressure forming process cannot realize the differential loading of the forming pressure, resulting in the risk of rupture when forming thin-walled metal pipes with small features

[0004] (2) Simply adopt the magnetorheological elastomer forming process, because the deformation of the rubber body is an elastic deformation, it is prone to instability after being squeezed, resulting in a decrease in the shape accuracy of the magnetorheological elastomer

In addition, the use of rubber as the filling medium has poor fluidity, and it is difficult to form parts that require high precision in shape and size.

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