A kind of manufacturing method of threaded compression type steel pipe fittings

Abstract

The field of processing and forming disclosed by the present invention is specifically a method for manufacturing a threaded compression-type steel pipe fitting. The method includes the following steps: performing high-pressure forging blanks on the threaded compression-type pipe fitting at the metal recrystallization temperature The preparation; after that, the forming process of the middle hole of the compression-type steel pipe fittings; the final post-forging treatment. The present invention replaces the status quo of perennial imports, reduces production costs, greatly saves manpower and time, and reduces the processing period; adopts high-pressure forging to eliminate the defect of loose inner layer material of large steel billets. In addition, the forging process It is forged at the metal recrystallization temperature to avoid dimensional errors caused by thermal expansion and contraction, so the shape and size of precision forged workpieces are easier to control. quality.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a method for manufacturing a threaded clamping type steel pipe fitting. Background technique [0002] More than 95% of the existing steel clamping threaded pipe fittings adopt the argon arc welding process, and about 10% of the high-end field adopts the friction welding process (patent number: ZL200610096951.9) [0003] The process of argon arc welding with threaded clamping steel pipe fittings includes (see the appendix Figure 1-2 ): 1 threaded end: steel precision casting - turning thread - turning welding port; 2 card pressure socket end: pipe - cutting - flat end - end forming - smooth plane - cleaning. The welding ports of 1 and 2 are aligned, and the welding adopts argon arc welding without adding wire. The basic process is to first align the two mouths that need to be welded to the parts, and spot weld two points in the 180°circumferential direction at the joint of the ou...

AI Technical Summary

Problems solved by technology

[0008] The threaded parts of friction welding are processed by castings, which is a high energy consumption and high pollution process, and there are defects such as shrinkage, porosity and inclusions, which lead to environmental factors such as vibration, thermal expansion and contraction of the threaded parts or welded parts during the use of the pipeline, resulting in castings Leakage failure occurs in shrinkage or inclusion parts; secondly, thick-walled seamless pipes are formed using paraffin mineral lubricating oil, which is difficult to clean, produces more waste oil and cleaning wastewater, and pollutes the environment; in addition, friction welding due to friction stop time and upsetting force It is not easy to control, there will be false welding and false welding, and there will be sudden disconnection in pipeline application, which is very dangerous in high temperature or high pressure pipeline application

Images