Method and device for molding small-angle bent pipe fitting by taking different curved surfaces as extrusion surfaces

Abstract

The invention discloses a method and a device for molding a small-angle bent pipe fitting by taking different curved surfaces as extrusion surfaces, and relates to a preparation technology for medium and thin-wall bent pipe fittings. A metal blank is subjected to extrusion molding through the molding device taking different curved surfaces as the extrusion surfaces; and the device comprises a mould molding part, a mould fixing part and a guide part. The invention has the advantages that: a female die and a male die of the mould molding part and a central line of a spindle are in the same straight line in the extrusion molding device of the bent pipe fitting; and the mould is convenient to assemble and easy to adjust. The bent pipe fitting is prepared by changing the shape and the concave-convex degree of a curved surface at the discharge end of the female die; the device has a rational structure and a simple process; and the bent pipe fitting has uniform wall thickness, does not crinkle, and has a cross section free from distortion, reliable quality and a broad application prospect.

Description

technical field [0001] The invention relates to the preparation technology of medium and thin-walled pipe bending parts, in particular to a forming method and device for forming small-angle bending pipe parts with different curved surfaces for extrusion. Background technique [0002] With the development of forming equipment and manufacturing technology, pipe bending parts with complex shapes appear more and more frequently in industrial fields, especially in high-tech industrial fields, such as aircraft, ships, automobiles, gas pipelines, and some stand. Because the use of curved pipe fittings instead of the original wire or plastic pipes can reduce weight and improve durability. With the widespread application of pipe bending parts, people have higher and higher requirements on the bending quality and forming process of pipe materials. Most of the curved pipe fittings produced by traditional methods such as push bending and rolling bending have some defects, such as the r...

AI Technical Summary

Problems solved by technology

With the widespread application of pipe bending parts, people have higher and higher requirements on the bending quality and forming process of pipe materials. Most of the curved pipe fittings produced by traditional methods such as push bending and rolling bending have some defects, such as the reduction of the outer wall. Defects such as thinness and cracking, thickening of the inner wall, wrinkling, and cross-sectional distortion, and for small-angle bending pipes, due to the limitation of their angles, springback is particularly serious after bending

In actual bending, the bending angle is often increased according to the empirical formula, but due to the limitations of materials, molds, etc., good results cannot be achieved

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