Variable-diameter bent pipe anti-wrinkle mandrel

Abstract

The invention discloses a variable-diameter bent pipe anti-wrinkle mandrel. The variable-diameter bent pipe anti-wrinkle mandrel comprises a core wire, mandrel elements, arc T-shaped inserting pieces,disc covers and small balls. Round through holes are formed in the centers of the mandrel elements, the disc covers and the small balls; the adjacent mandrel elements are in series connection throughthe core wire and are isolated through the small balls, multiple round through holes symmetric about the center and equal in size are formed in the mandrel elements, and four cylindrical plug pins onthe disc covers are used for assembling; meanwhile, the round holes equal to the cylindrical plug pins on the disc covers in diameter are formed in the arc T-shaped inserting pieces, and the effect of fastening the arc T-shaped inserting pieces is achieved; multiple rectangular inserting grooves are formed in the side face of each mandrel element, and the arc T-shaped inserting pieces are inserted into the inserting grooves; and the variable-diameter bent pipe anti-wrinkle mandrel is suitable for a series of bent pipes of different pipe diameters, after use is finished, the core wire is pulled, the bent pipe mandrel can be simply and rapidly taken out of the pipe fitting, the structure is simple, and cost is saved.

Description

technical field [0001] The invention relates to the field of anti-wrinkle devices for bent pipes, in particular to a variable-diameter bent pipe anti-wrinkle mandrel. Background technique [0002] As pipe bending technology is widely used in aviation, aerospace, automobile and other fields, pipe bending occupies an increasingly important position in the development of modern industry. However, during the bending and forming process of the pipe fittings, due to the hollow structure of the pipe fittings and the limitations of various external molds, the pipe fittings will be subject to complex stresses and produce defects, such as inner wrinkling and cross-sectional distortion. Therefore, in order to improve the precision of the product, there are higher requirements for the quality and performance of the bent pipe. When bending thin-walled or small-diameter pipe fittings, a variable-diameter bend-proof mandrel can be applied to a series of bends with different diameters, red...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a variable-diameter bent pipe anti-wrinkle mandrel to solve the problems of complex structure and limited effect of the existing flexible mandrel

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