A kind of mold and forming method for numerical control bending of double-layer pipe

Abstract

The invention discloses a double-layer tube numerical control bending die and a forming method thereof. The die comprises pressure dies arranged in a stepped mode, a clamping die, a benign die body, an anti-wrinkling die, an auxiliary die and a core die, wherein the clamping die, the bending die body, the anti-wrinkling die, the auxiliary die and the core die are arranged in a stepped mode; the die is mounted on a tube bending machine and is used for bending a double-layer tube through the numerical control bending technology without conducting clearance sealing on packing of the double-layertube in the process, so that the manufacturing efficiency is improved, and the manufacturing cost is lowered. Secondly, the die adopts the stepped clamping method and can conduct clamping on an inner-layer tube and an outer-layer tube effectively, the phenomenon that the inner-layer tube slips in the bending process is avoided, and the forming quality of the double-layer tube is improved. Moreover, the bending die can effectively and tightly press the inner-layer tube and the outer-layer tube through the step-like pressure dies and the auxiliary die to achieve boosting on the inner-layer tubeand the outer-layer tube and improve material flow of bending plastic deformation. The double-layer tube numerical control bending die is ingenious in concept, compact in structure, reasonable in arrangement, high in manufacturing accuracy, high in working efficiency and low in energy consumption and has high engineering utilization value.

Description

technical field [0001] The invention relates to the technical field of pipe bending processing, in particular to a mold for numerically controlled bending of a double-layer pipe and a forming method thereof. Background technique [0002] At present, high-performance and lightweight thin-walled conduit components are widely used in the fields of aviation, aerospace, navigation and automobile manufacturing. Thanks to its gap structure and low heat transfer coefficient between the two tubes, the double-layer tube is expected to meet the high-efficiency requirements of conduit parts for leak prevention and heat insulation, and has demonstrated its superiority over single-wall tubes characteristics and wide application prospects. However, traditional pipe bending processes, such as numerical control bending, press bending, push bending and free bending, are mostly aimed at the bending of single-wall pipes, and are not applicable to the overall bending of double-layer pipes with ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double-layer pipe CNC bending mold, which improves the numerical control bending forming limit and forming accuracy of double-layer pipe fittings, and solves the problem that the traditional single cavity is difficult to effectively clamp, boost and support the inner and outer pipes at the same time etc., the forming limit is low and the forming accuracy is difficult to guarantee

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