Plastic connecting device and method of non iso-wall thickness metal tubular product

Abstract

The invention discloses a plastic connecting device of a non iso-wall thickness metal tubular product and belongs to the technical field of tubular product connection. The plastic connecting device ofthe non iso-wall thickness metal tubular product comprises an induction coil, an upper mold, a forming outer mold, a fixed lower mold and a mandrel, wherein the fixed lower mold is barrel-shaped, themandrel and the fixed lower mold are arranged coaxially, a first wall thickness tube is placed between the fixed lower mold and the mandrel, the inner surface of the first wall thickness tube is in contact with the mandrel, the outer surface of the first wall thickness tube is in contact with the inner surface of the fixed lower mold, and the lower end of the second wall thickness tube is a sharpcorner. During heating, the induction coil is placed in a local heating area at the upper end of the first wall thickness tube; after heating, the forming outer mold is located at the upper end of the fixed lower mold and forms a cavity with the outer surface of the upper end of the mandrel; the upper mold is located above the second wall thickness tube and is in contact with the upper end surface of the second wall thickness tube; and the upper mold is used for pressing one end, with the sharp corner, of the second wall thickness into the upper end surface of the first wall thickness tube.

Description

technical field [0001] The invention relates to the technical field of pipe connection, in particular to a plastic connection device and method for metal pipes with unequal wall thickness. Background technique [0002] Pipe parts are widely used in the manufacturing industry. In order to meet the requirements of modern industry for the wall thickness and performance of specific parts of metal pipe fittings, the connection of metal pipes with non-uniform wall thickness has gradually received attention. The traditional pipe connection is usually carried out by welding, but there are disadvantages such as low production efficiency, poor repeatability, and the welding process is not suitable for mass production. In addition, for some materials with poor welding performance, it is difficult to realize the connection of pipes by welding. For some non-equal-wall metal pipes subject to extrusion or tensile stress, the welding process has higher requirements for equipment and toolin...

AI Technical Summary

Problems solved by technology

The traditional pipe connection is usually carried out by welding, but there are disadvantages such as low production efficiency, poor repeatability, and the welding process is not suitable for mass production.

In addition, for some materials with poor welding performance, it is difficult to realize the connection of pipes by welding.

For some non-equal-wall metal pipes subject to extrusion or tensile stress, the welding process has higher requirements for equipment and tooling, and the welding process is more complicated

In addition, the welding seam may be cracked in a high-pressure environment, and the reliability will be affected.

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