Machining method for metal pipes

Abstract

The invention discloses a machining method for metal pipes. The machining method comprises the following steps that firstly, sheet metal is rolled into tubular pipe bodies, and welding connecting at the pipe body joint positions is conducted; secondly, at least two layers of pipe bodies are coaxially arranged in a nested manner, and weld seams on the side walls of the pipe bodies are mutually staggered by a set angle; thirdly, gaps among multiple layers of the pipe bodies are vacuumized, the gaps of the two ends of the pipe bodies are welded and sealed, and the gaps form sealed vacuum thin layers; and fourthly, the pipe bodies are subjected to hot-rolling forming or cold-rolling annealing. The machining method has the beneficial effects that the pipe machining processes are simple, the pipe side wall structure strength is high, the yield is high, and the production cost is low; and most of all, seamless metal pipes with the large pipe opening diameter can be produced, and the product blank in the market is filled.

Description

technical field [0001] The invention relates to a processing method of metal pipes. Background technique [0002] At present, metal pipes can be divided into welded pipes and seamless pipes according to different processing methods. Among them, welded pipes are made by bending metal sheets into circular arcs, and then welding the sheets end to end to form pipes. Pipes made by welded pipe technology usually have thinner walls; When making seamless pipes, the processing methods of rolling, forging, extrusion, machining, and deep hole drilling are generally used. For seamless pipes manufactured by deformation processing and machining, metal raw materials need to be smelted into metal ingots, and then The metal ingot is forged into a metal bar, and then deformed into a seamless tube blank. The processed seamless tube has a small diameter, and the processing procedures are complex, which consumes energy and consumes energy. The yield is low, and the production cost is high. SUM...

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Problems solved by technology

[0002] At present, metal pipes can be divided into welded pipes and seamless pipes according to different processing methods. Among them, welded pipes are made by bending metal plates into circular arcs, and then welding the plates end to end to form pipes. Pipes made by welded pipe technology usually have thinner pipe walls; When making seamless pipes, rolling, forging, extrusion, machining, and deep hole drilling are generally used. The seamless pipes manufactured by deformation processing and machining first need to melt the metal raw materials into metal ingots, and then The metal ingot is forged into a metal rod, and then deformed into a seamless tube billet. The processed seamless tube has a small diameter, and the processing procedure is complicated, time-consuming, energy-consuming, low-yield, and high-production costs.

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