Device and method for compounding and forming central flange pipe joint from pipe blank in single-step and multi-directional way

Abstract

The invention discloses a device and a method for compounding and forming a central flange pipe joint from a pipe blank in a single-step and multi-directional way. The method comprises the following steps of: applying enough pressure on an appropriate pipe billet serving as a blank to make the whole pipe billet plastically deformed; forming a central flange of the pipe joint by upsetting; and inversely extruding to form a small head end part of the pipe joint and positively extruding to form a large head end part of the pipe joint, so metal upwards, downwards and radially flows, the forming force is small, and the number of stations is small. Compared with a cutting pipe joint, the invention has the advantages of high material utilization ratio and production efficiency and good metal flow structure, and is particularly applicable for production of high-pressure pipe joints.

Description

technical field [0001] The invention relates to a central flange pipe joint, in particular to a device and method for one-step multi-directional composite forming of a central flange pipe joint from pipe blanks. Background technique [0002] Pipe joints are key parts of pipeline connections in petroleum, chemical, metallurgy, machinery and other industries. They can be produced by various processes such as casting, welding, plastic processing, and cutting processing. The pipe joints have high strength and good corrosion resistance. Therefore, the mass production of most pipe joints adopts the plastic processing process. In contrast, the cutting process is used to produce the middle flange pipe joints. Low, low material utilization. [0003] The shape and structure of pipe joints are different, and the plastic processing technology is also different. Generally, stamping, forging, extrusion and other processes can be used. Compared with the end flanges, the difficulty of usin...

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Problems solved by technology

[0002] Pipe joints are key parts of pipeline connections in petroleum, chemical, metallurgy, machinery and other industries. They can be produced by various processes such as casting, welding, plastic processing, and cutting processing. The pipe joints have high strength and good corrosion resistance. Therefore, the mass production of most pipe joints adopts the plastic processing process. In contrast, the cutting process is used to produce the middle flange pipe joints. Low, low material utilization

[0003] The shape and structure of pipe joints are different, and the plastic processing technology is also different. Generally, stamping, forging, extrusion and other processes can be used. Compared with the end flanges, the difficulty of using plastic processing methods in the production of the middle flange lies in the polymer material in the middle. , forming is difficult and requires multiple formings. At present, there is no report on the use of pipe blanks for one-step multi-directional composite forming of the middle flange pipe joint.

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