Method and special die for manufacturing composite pipeline

Abstract

The invention discloses a method and a special die for manufacturing a composite pipeline. In the method for manufacturing the composite pipeline, axial cold extrusion is performed along the inner wall of a copper pipe by a cold-drawing machine and the special die to ensure that the copper pipe reaches a critical temperature and is subjected to plastic deformation, so that the copper pipe is tightly attached to a carbon steel pipe. The special die for manufacturing the composite pipeline comprises a die body made of a nylon 1010 material, wherein the die body is provided with a connecting hole connected with a core rod of the cold-drawing machine; and the front end face of the die body is provided with a transition fillet. After the copper pipe is compounded with the carbon steel pipe, the advantages of the copper pipe are kept, the defects that the copper pipe is expensive, easy to dent and deform, and the like are overcome, and the bending strength and impact resistance of the composite pipeline are greatly improved; in addition, the adopted cold extrusion composite technology is low in equipment requirement, operation difficulty and energy consumption, high in speed, quality and efficiency, concise and practical, and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of pipe materials, in particular to a manufacturing method of a composite pipe and a special mold thereof. Background technique [0002] The application of the fluid conveying pipeline, which has always been called "industrial blood", involves almost all aspects of production and life, so all countries attach great importance to its production and development. Taking steel pipes as an example, the production ratio of major developed industrial countries accounts for about 15%-20% of the total steel products, while my country currently only accounts for 8-10%. [0003] Traditional pipes are basically made of a single material with relatively single performance. They are either anti-corrosion and not pressure-resistant, or pressure-resistant and not anti-corrosion, or anti-corrosion and not anti-aging. There are always defects, for example: 1. Pure copper pipes have superior corrosion resistance , wear resistance, disi...

AI Technical Summary

Problems solved by technology

[0003] Traditional pipes are basically made of a single material with relatively single performance. They are either anti-corrosion and not pressure-resistant, or pressure-resistant and not anti-corrosion, or anti-corrosion and not anti-aging. There are always defects, for example: 1. Pure copper pipes have superior corrosion resistance , wear resistance, disinfection and keeping fluid clean, etc., but pure copper pipes are expensive, and due to their own plasticity, pipes are easy to bend and deform, and their impact resistance is poor. Accidents such as leakage, corrosion, and bursting occur; 2. Although the price of galvanized steel pipe is low, it is easily corroded in the air, which not only has a short service life, but also easily causes secondary pollution of the fluid and affects human health; 3. Plastic pipes such as PE, PEX, and PVC have the advantages of light weight and convenient connection, but they are easy to age, have a low service life, and are not resistant to external force stamping, especially the lead used as a plastic heat stabilizer in the pipe is very easy to cause damage to the human body through the fluid. Heavy metal pollution

Copper pipes have many advantages, but due to the high price of pure copper pipes and low resistance to external forces, the development and popularization of a pipe with relatively low price, good resistance to external forces and the advantages of pure copper pipes is a difficult problem to be overcome

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