Seamless fork-shaped tube forming process and forming die

Abstract

The invention discloses a forming process of a seamless fork-shaped pipe, comprising the following steps of: (1) bending, heating a seamless fork-shaped steel pipe via middle frequency and manufacturing an elbow in 160-200 degrees; (2) shaping the manufactured elbow and enabling the center distance of the elbow to basically accord with the size of the centre distance of the fork-shaped pipe; (3) flattening the shaped blanks and enabling the pipe diameter B of two branch pipes to be greater than or equal to the outer diameter of the branch pipe of the fork-shaped pipe by 1-2 mm; (4) extruding and forming, placing the heated pipe blanks into a forming mould for extruding and forming, enabling the outer diameter and the length of two branch pipes of the fork-shaped pipe to accord with the design demand, and forming bulges on the outer arc at the same time; and (5) turning and processing, cutting a cover protruding from the circular arc at the upper end part of the fork-shaped pipe and forming a main pipe interface. The seamless steel pipe is used as the raw material, and the mould is used for forming, thus the difficulty of forming the fork-shaped pipe is solved. The invention has the advantages of improving the forming quality and the finished product ratio of the fork-shaped pipe, effectively reducing the manufacture procedures, saving materials, and reducing the manufacture cost.

Description

technical field [0001] The invention belongs to the technical field of fork-shaped tubes, and mainly relates to a seamless fork-shaped tube forming process and a forming die. Background technique [0002] Fork-shaped tube, also known as trident tube, fork-shaped tee, Y-shaped tee, is used for the transition connection of a pipe bifurcating into two parallel pipes, and is an important accessory for the water-cooled wall of the heating part of the power plant boiler. Depending on the conditions of use, the materials include carbon steel (20G), alloy steel (12Cr1MoV, 15CrMo, P22, P91), etc. [0003] The water-cooled wall is the main heating part of the boiler. It consists of several rows of steel pipes to form the evaporation heating surface, which is laid around the furnace of the boiler. The fork-shaped pipes are the accessories connecting these steel pipes. Its inside is flowing water or steam, and the outside receives the heat of the boiler furnace flame. The function of ...

AI Technical Summary

Problems solved by technology

Not only is it difficult to form, the workload of machining is heavy, the manufacturing cycle is long, and the utilization rate of materials is low

Due to its special structure, it is easy to cause out-of-tolerance during processing and the parts will be scrapped. The yield is generally around 70% to 80%.

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