Preparation method for bi-metal composite t-branch pipe

Abstract

The invention relates to a preparation method for a bi-metal composite t-branch pipe. The preparation method comprises the following steps that 1, an inner metal pipe and an outer metal pipe which are made of different materials are prepared and assembled together in a sleeving mode; 2, the metal pipes which are assembled together in the sleeving mode are placed in a tee machine mold; 3, liquid which is purified water is injected into the inner metal pipe; and 4, a pressurization system for equipment is started, and internal pressure Pi is provided through the pressurization system for the equipment; meanwhile, two horizontal side cylinders of a hydraulic machine carry out centering movement synchronously for squeezing a pipe blank, pressure Fa is provided by a left oil cylinder and a right oil cylinder, and balance force Fq of the end of a branch pipe is provided by an upper oil cylinder; the size of the pipe blank is decreased after the pipe blank is squeezed, the pressure of the liquid in the pipe blank is increased as the size of the pipe blank is decreased, and (meanwhile, the pressurization system can be determined whether to conduct pressurization or not according to the recombination and deformation conditions of the pipe blank); as the pressure in the pipes is increased, the elastic deformation state of the inner pipe is converted to a plastic deformation state, the inner pipe is attached to the outer pipe tightly, and the inner pipe and the outer pipe are attached together tightly; when the pressure in the pipes is further increased and reaches the pressure which is required when the t-branch pipe is expanded out, a metal material flows along an inner cavity of the mold and is expanded out of the branch pipe under the dual action of the side cylinders and the liquid pressure in the pipe blank.

Description

technical field [0001] The invention relates to a preparation method of a three-way pipe, in particular to a preparation method of a bimetal composite three-way pipe, and belongs to the technical field of metallurgy and pipe making. Background technique [0002] Tee pipes are commonly used parts on pipelines and belong to pressure pipeline components. They are widely used in pipelines in industries such as petroleum, chemical industry, shipbuilding, nuclear power, power station construction, food, pharmaceuticals, aerospace, non-ferrous metal smelting, urban water supply, and papermaking. . Stainless steel alloys are commonly used anti-corrosion materials in harsh corrosive environments. However, the cost of pure stainless steel alloy pipeline materials is relatively high, especially under high pressure conditions, due to the thicker pipe walls, the required cost is even higher. The composite tee pipe made of ordinary carbon steel on the outer layer and stainless steel on t...

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Problems solved by technology

In the production of existing domestic bimetallic composite tee pipes, firstly, the composite straight pipe is formed by welding, and then the bimetallic tee pipe is ob

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