Forming fixture and method for manufacturing arc-shaped parts by bending high-temperature alloy thin-wall rectangular pipes

Abstract

The invention provides a forming fixture and method for manufacturing arc-shaped parts by bending high-temperature alloy thin-wall rectangular pipes. The forming fixture comprises a rolling plate, a positioning ring, a stressing mechanism and a circumferential positioning and clamping mechanism. Manual bending of the rectangular thin-wall pipes is achieved through the rolling plate, the positioning ring and the stressing mechanism. The structure is simple, the fixture and the method are easy to realize, convenient to use and practical, operation is easy and convenient, safety and reliability are achieved, machining condition requirements are not high, and production cost is low. Meanwhile, after the rectangular thin-wall pipes are bent and formed, the bending radius is controlled within + / -1. Section deformation is controlled within 0.3. Pipe surfaces of bent parts are flat and smooth, wrinkles and creases are not generated, and the shape and the size of machined parts meet the requirements of a design drawing.

Description

【Technical field】 [0001] The invention relates to the field of sheet metal forming, and in particular provides a forming fixture and method for bending a high-temperature alloy thin-walled rectangular tube into an arc-shaped part. 【Background technique】 [0002] The thin-walled rectangular pipe part of an aero-engine is made of high-temperature alloy GH536, the wall thickness is 0.6mm, and the bending radius of the part is R495.56. The rectangular pipe with a cross-sectional specification of 28.63×21.89mm is bent into an arc with a radius of R495.56 Shaped parts, which require extremely high formability. The annual output of aero-engines is small, and most of the parts are produced in one piece. Considering the saving of production costs, the parts are processed by manual bending. If the traditional bending forming processing method is adopted, due to the special structure of the thin-walled rectangular tube, it is more difficult to form than the circular tube. When the rec...

AI Technical Summary

Problems solved by technology

If the traditional bending forming processing method is adopted, due to the special structure of the thin-walled rectangular tube, it is more difficult to form than the circular tube. When the rectangular tube is bent, the outer material of the forming area is more likely to be subjected to tangential tensile stress, resulting in thinning of the wall thickness. Serious; the inner material is severely wrinkled due to tangential compressive stress, and the rebound phenomenon is obvious during the bending process, resulting in distortion of the shape and section, and it is difficult to guarantee the size of the bending radius

Therefore, it is difficult to realize the traditional bending forming processing method.

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