Novel hot extrusion tee joint forming process

Abstract

A novel hot extrusion tee joint forming process comprises the following steps: Step one, rolling steel plates: a stamped steel plate is divided into three areas arranged in parallel according to the depth, namely an end part area, a middle part area and a tail part area; the wall thickness of the middle part area is greater than those of the end part area and the tail part area; smooth transition; Step two, molding and welding a steel tube, and manufacturing the steel tube: a thickening area is formed on the wall of the area where the middle part area is; Step three, trepanning, extruding and forming a tee joint workpiece: marking out a line and trepanning in the thickening area; Step four, shaping processing: heating to about 900 DEG C, heat preserving, and shaping. The novel hot extrusion tee joint forming process is optimized based on the conventional process, comparatively simpler, saves the steel tube flattening and bulging processes, greatly saves the product manufacturing time, and improves the working efficiency; when the flattening and bulging processes are saved, the manufacturing and molding time of a tee joint is greatly reduced, and the entire production cycle is substantially shortened.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas transportation equipment, in particular to a novel hot extrusion tee forming process. Background technique [0002] In the construction of long-distance oil and gas pipeline projects, in order to meet the needs of distribution, direction change, and metering, a large number of pipe fittings such as elbows and tees are often required for on-site construction of stations, valve rooms, and compressor stations. Among the various types of tees, extruded tees are widely used due to their unique advantages. The manufacture of extruded tees is based on the principle of metal plastic deformation, heating the material to the austenitic state, so that the tube blank metal produces plastic flow in the mold cavity. Its characteristic is that there is no weld seam in the transition area at the intersecting line of the main branch pipe, which is convenient for non-destructive testing, and its reliab...

AI Technical Summary

Problems solved by technology

[0009] As mentioned above, the main procedures of the conventional hot extrusion tee forming process are: pipe making, hot flattening (increased deformation of the tee), pressing, extrusion flanging, rounding and finishing, and the manufacturing process is relatively complicated.

And multiple times of heat treatment during flattening, bagging and extrusion flanging, which is a waste of time and resources

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