Working device for extruding miniature thin-wall multi-hole flat pipes by using multiple-step tower-shaped fishtail type core rod

Abstract

The invention provides a working device for extruding miniature thin-wall multi-hole flat pipes by using a multiple-step tower-shaped fishtail type core rod. A design mode of a tower-shaped fishtail type core rod is applied to a divergent die extrusion process of the miniature ultrathin-wall aluminum alloy flat pipes, the design is considered from the perspectives of increase of the contact area of metal in a welding-on region and improvement of welding-on possibility, and the overall dimension of the core rod is modified. The design idea facilitates the area of a material preparation region before welding-on through change of a series of cross-section shapes and design of a multiple-step cross-section transition region, the step number and the minimum critical dimension of the core rod can be designed for the divergent die extrusion of the miniature pipes according to the demands for different section bar cross sections and supporting strength of the core rods made from different materials, and an application range of the design idea of the core rod is not limited in section bars with certain shapes and is greatly widen in the production and application field of relevant aluminum alloy products. The dead-zone forming problem in a traditional process is also solved through selection of cross-section shapes in the design, and the design reasonability is further improved. The working device for extruding the miniature thin-wall multi-hole flat pipes by using the multiple-step tower-shaped fishtail type core rod has wide application prospect.

Description

technical field [0001] The invention relates to the hot extrusion technology of miniature ultra-thin-walled flat pipes, which is used for the mold design of hot extrusion forming split molds. Background technique [0002] With the widespread application of split die extrusion technology in pipe production, the demand for the production of micro-pipes such as aluminum alloys and copper alloys has gradually increased. The problem of difficult material flow filling exists in the design method of the welding chamber of the traditional split mold, especially the problem of welding difficulty caused by insufficient material flow filling at the welding joint between the ribs of the microporous pipe and the outer wall. In the prior art, the shape and size design of the mandrel focuses on the sizing extrusion stage, and does not consider that the shape of the mandrel is changed after the welding and stripping and sizing extrusion stages, which increases the material preparation area ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of difficult material flow filling and welding difficulties caused by insufficient material flow in the existing mold, and provide a working device for thin-walled porous flat pipes with multi-stage tower-shaped fishtail mandrels

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