Tube bending inner supporting device and tube bending method

Abstract

The invention discloses a tube bending inner supporting device and a tube bending method. The tube bending inner supporting device comprises a load mechanism, a steel wire rope, an elastic core die, a pushing die and a pushing part. The load mechanism is provided with a stretchy rod which contracts to one side. One end of the steel wire rope is connected with a stretchy end of the stretchy rod and the other end of the steel wire rope is connected with a top disc. The elastic core die, the pushing die and the pushing part sequentially and movably penetrate through the steel wire rope. One end of the elastic core die is connected with the top disc in an abutted mode. The pushing part is detachably connected with the pushing die and retracts through the stretchy rod of the load mechanism. The top disc is matched with the steel wire rope to pull the elastic core die and the pushing die tight, so that the elastic core die expands in an inner cavity of a tube in a radial mode and is fully contacted with the inner wall of the tube. According to the tube bending inner supporting device and the tube bending method, the core die is matched with the inner wall of the tube in a self-adapting mode, crinkling is avoided and manufacturing and use cost can be greatly reduced.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a pipe bending inner support device using an elastic mandrel and a pipe bending method. Background technique [0002] As we all know, the bending and forming of pipes requires the synergy and strict cooperation of multiple molds. During the bending forming process, the clamp block drives the pipe and the bending die to rotate synchronously. Under the action of the clamp block tension, the pipe slides over the bending tangent point, and bends and deforms under the bending moment of the bending plane and contacts the bending die, thus The predetermined bending radius of the pipe is formed, and the bending moment of the pipe will be generated by the resultant force of the pulling force of the clamp on the pipe and the friction between the pipe molds. During the bending process, in order to prevent the defects of wrinkling and excessive cross-section of the pipe, it is necessary...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the difference in the geometric dimensions of the pipes, it is often necessary to customize multiple sets of metal mandrels for a pipe of one specification, and the cost of mold manufacturing is high;

[0004] 2. During the pipe bending process, there will be uneven contact between the metal mandrel and the inner wall of the pipe, which will cause the inner cavity of the pipe to be easily scratched, and prone to forming defects such as wrinkles, and the forming quality is difficult to control;

[0005] 3. In addition, the metal mandrel itself is easy to wear in the tube cavity, which further increases the cost of manufacturing and using the mandrel

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