Numeric control bending core mould of thin-wall tube with large diameter

Abstract

The invention discloses a numeric control bending core mould of a thin-wall tube with the large diameter, which comprises a core mould core rod (1), eccentric core heads (2), an intra-core head connecting member (3) and a spring (4). The numeric control bending core mould of the thin walled tube with the large diameter is characterized in that the core mould core rod (1) is connected with the eccentric core heads (2) and the eccentric core heads (2) by using a ball-and-socket structure, and the spring (4) clamps the intra-core head connecting member (3) on the eccentric core heads (2), and ball centers of the eccentric core heads (2) are in the position of the core head body instead of a geometric centre of the core head. By using the core mould, the numeric control bending core mould is adapted to bending deformation of tubing in various bending radiuses, has a significance for high-quality stable formation of the thin walled tube with the large diameter in the small bending radius, and can reduce the crinkling probability and the thin reduction degree of the tubing and improve bending quality of a conduit under a condition of no increasing flattened degree.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a numerically controlled bending mandrel for an aluminum alloy large-diameter thin-walled tube and a design method for the eccentric mandrel. Background technique [0002] With the increase of the diameter of the aluminum alloy tube and the decrease of the bending radius, the wrinkling of the aluminum alloy large-diameter thin-walled tube will become more and more likely to occur during CNC bending. At present, the industry often adopts the method of reducing the contact gap between the pipe and the mold to reduce the possibility of pipe wrinkling, but this will increase the degree of thinning and flattening of the pipe. In the CNC bending process of aluminum alloy large-diameter thin-walled tubes, the parameters of the mandrel will have an important impact on the wrinkling, thinning and flattening of the tubes. Traditional thin-walled pipe CNC bending mandrel head structure...

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that due to the characteristics of the symmetrical structure, the range of interference between the core head and the core head during rotation is relatively large. The deformation of the bending radius is coordinated; at the same time, because the symmetrical core structure is prone to excessive contact with the outer arc surface of the pipe, the degree of wall thickness reduction of the pipe is increased

In the invention patent application document with the application number 200710018458.X, a design of a mandrel for flexible pipe bending is disclosed. Although the mandrel of this design can increase the degree of rotation of the mandrel during the pipe bending process, the invention still uses Symmetrical core head, so it is not applicable to the CNC bending process of aluminum alloy large-diameter thin-walled tubes

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