Production method of hot-rolled pipe blank for coupling piece

Abstract

The invention provides a production method of a hot-rolled pipe blank for a coupling piece, and belongs to the field of production and manufacturing of hot-rolled pipe blanks. Specifically, the method comprises the steps of S1, pipe blank heating; S2, perforating; S3, hot rolling; S4, correcting; S5, hot expanding; and S6, cooling, inspecting and warehousing; in the S5, a pierced billet is subjected to rotary expanding rolling, high-pressure water descaling treatment is conducted on the outer wall of the pierced billet at a roller inlet of a rotary expanding machine, an atomized high-pressure salt mist is sprayed into the billet through an atomizing nozzle at the head of an ejector rod, and thus descaling treatment is conducted on the inner wall of the billet.. In the pipe blank expanding process, the outer wall and the inner wall of a pipe blank are subjected to descaling treatment at the same time, in the inner wall descaling process, the atomizing nozzle is directly arranged at the head of an ejector rod, the high-pressure salt mist obtained after a saline solution and nitrogen are mixed and atomized is sprayed to the inner wall of the pipe through the atomizing nozzle, oxide skin on the inner wall is subjected to be broken and fall off through the salt explosion effect, and high-pressure salt mist airflow is blown out of the pipe, so that oxide skin on the outer wall and the inner wall of the pipe blank is effectively removed, and the surface quality of a product is improved.

Description

technical field [0001] The invention belongs to the field of production and manufacture of hot-rolled tube blanks, and in particular relates to a method for producing hot-rolled tube blanks for coupling parts. Background technique [0002] The coupling piece is a connecting piece used to connect two pipes. When in use, the coupling piece is clamped on the outside of the ends of the connecting ends of the two pipes to play a role of communication and sealing. The production of couplings usually uses hot-rolled tube billets as raw materials, so the quality of the tube blanks has a direct impact on the quality of the finished coupling parts; The surface defect of the billet caused by cleaning is an important factor affecting the quality of the hot-rolled billet. Therefore, how to remove the scale as much as possible during the hot-rolling process is a problem that needs to be solved. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the inventio...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides a method for producing hot-rolled tube blanks for couplings, which solves the problem of scale removal during hot-rolling