Method for forming large elbow and tool for forming large elbow

Abstract

The invention discloses a specific assembling method of a tool for forming the large elbow. The tool comprises four H-shaped steel, wherein a plurality of steel plates are respectively connected onto each H-shaped steel, the number of the steel plates is determined according to elbow parameters including external diameter, bending angle and linear segment length which are required by elbow forming, a round hole is formed in each steel plate, the diameter of the round hole equals to the external diameter of the elbow to be installed and formed, the two ends of each H-shaped steel are respectively connected with a ring plate, and a backing ring is connected onto the external diameter of each ring plate; and a method for specifically installing the tool for forming the elbow comprises steps of horizontal reference plane determining, H-shaped steel 1 and H-shaped steel 2 installing, steel plate installing, H-shaped steel 3 and H-shaped steel 4 installing and backing ring installing. By the tool, the forming technical problem of large pipelines with cross sections which are formed by installing and welding steel pipes of a plurality round straight pipes, omega-shaped straight pipes, polygonal straight pipes and the like is solved, and the tool for forming the large elbow is simple in structure, is convenient to install, can be repeatedly used, has higher precision and can satisfy design requirements during the practical application.

Description

technical field [0001] The invention relates to the field of pipe forming, in particular to a specific installation method of a large-scale bent pipe forming tool. Background technique [0002] At present, there are many forming methods for bending pipes, including grooved wheel rolling method, induction heating bending method, mold pressing method, step-by-step forming method, and numerical control pipe bending method. For the bending of large metal pipes, the induction heating and simmering method is generally used, also known as the intermediate frequency pipe bending method. The mechanical rotating arm clamps the pipe head, and the medium frequency current is passed through the induction coil to heat the steel pipe. When the temperature of the steel pipe rises to the plastic state, the rear end of the steel pipe is propelled by mechanical thrust for bending, and the part of the bent steel pipe is quickly used The coolant is cooled, so that while heating, pushing, bendin...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem in the prior art that it is difficult to bend and form large-scale pipes whose cross-sections are assembled and welded by multiple circular straight pipes, Ω-shaped straight pipes, polygonal straight pipes and other steel pipes, and provide a Specific installation method of large pipe bend forming tooling

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