Method for designing thin walled pipe numerical control snake core mould parameter

Abstract

The invention discloses a design method for a core die parameter in the thin-wall pipe digital control bending and forming process, which is characterized in that: firstly, modeling simplification is carried out on a core die complex connection structure through characteristic equivalence to obtain key parameters of a ball socket type structure core die (comprising a core rod and a flexible core head) which comprise a geometric structure of the core die and a function position in a bending pipe, and then, a reference formula of the corresponding core die parameter is deduced according to the plastic deformation character of the thin-wall bending pipe starting from geometric matching of the core die and a pipe. The design method for a bending pipe core die is simple and effective and can be used for fast selecting the core die parameter in the thin-wall bending pipe process under different bending conditions to compensate for the defects of an empirical formula in the actual production.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for designing parameters of a thin-walled tube numerically controlled bending mandrel. Background technique [0002] For the CNC bending process of thin-walled tubes, if there is no support function of the mandrel inside the tube, the tubes are prone to wrinkling and severe cross-sectional distortion. In the patent application of Chinese patent 200710018458.X, a flexible bending pipe mandrel is proposed. In this invention, the ball-and-socket structure mandrel with a flexible core head has good designability. In the process of thin-walled pipe bending , The ball-and-socket structure mandrel can rotate arbitrarily with the bending deformation of the pipe, so as to realize the rigid support for the bending section of the inner wall of the pipe. The diameter and bending radius of CNC pipe bends are different, and the design parameters of the mandrel vary greatly. In t...

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Problems solved by technology

In the actual production process of the flexible pipe bending mandrel, there are many specifications of the bending pipe mold, which increases the complexity of the mandrel design

At present, the method of experience and trial and error is often used to determine the parameters of the mandrel. The former is not universal (such as the empirical formula of mandrel diameter is 0.94 ~ 0.98D), while the latter is time-consuming and labor-intensive, often due to the design or installation of mandrel parameters. Unreasonable and lead to production problems

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