A viscous medium pressure forming method for thin-walled coverings with sudden changes in local curvature

Abstract

The invention belongs to the field of aerospace equipment thin-wall coverage piece manufacturing, and particularly relates to a viscous medium pressure forming method for a local curvature sudden change thin-wall coverage piece. According to the method, a plunger in a viscous medium bin is pushed, so that viscous media load the viscous medium pressure P to a plate blank from the viscous medium bin, under the action of the viscous medium pressure P, the plate blank is gradually attached to a cavity of a die, and at the cavity curvature sudden change position, a plate is promoted to flow throughthe viscous attaching stress tau of the viscous media, shape local sudden change area materials are supplemented, the area wall thickness is prevented from being reduced, the wall thickness uniformity is improved, finally, the plate blank is completely attached to the surface of the cavity of the die, and accordingly a good forming effect is achieved. According to the viscous medium pressure forming method, the forming technology is simple, the quality is stable, reliability is high, cost is low, and the viscous medium pressure forming method is suitable for forming machining of high-strengthheat resisting alloy local curvature sudden change thin-wall coverage pieces.

Description

technical field [0001] The invention relates to the field of forming and manufacturing of thin-walled parts of aerospace equipment, in particular to a viscous medium pressure forming method for thin-walled covering parts with sudden changes in local curvature. Background technique [0002] High-strength heat-resistant alloys with local curvature mutation thin-walled coverings are often used in thermal protection systems in the fields of aviation, aerospace and industrial thermal engineering. With the continuous improvement of structural performance and efficiency requirements, thermal protection parts usually need to be both heat-resistant and load-bearing. While completing the heat-proof function, they can transfer and distribute loads between structures. At the same time, in order to reduce the structural weight, the wall thickness of the parts is gradually reduced, and the number of thin-walled and ultra-thin-walled parts is increasing. These performance and structural f...

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Problems solved by technology

[0003] At present, such parts are generally formed by rigid die forming or thermoforming at room temperature. When the rigid die forming method is used to manufacture such parts, severe thinning or even cracking is likely to occur at the sudden change in local curvature; when thermoforming is used, the plate needs to be heated to Appropriate temperature is not conducive to the deformation and flow of the slab blank, and will change the surface quality of the slab; when soft molds such as polyurethane rubber are used for forming, the polyurethane material has poor high pressure resistance and limited deformation, and the part with a small radius of the curved surface has poor moldability and dimensional accuracy. Low

[0004] Therefore, there are problems such as severe wall thickness reduction, even cracking and low dimensional accuracy due to the difficulty in deformation control in the existing forming methods of thin-walled coverings with sudden changes in local curvature.

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