Manufacturing method of metal tube

Abstract

The invention relates to a manufacturing method of a metal tube. The method comprises the following steps of manufacturing a tube blank, stretching the tube blank, finely stretching the tube blank, and cutting the tube blank to form a tube stock. The tube blank is manufactured in a way of welding a tube and is machined into a form of a seamless beam tube, the machined tube blank is brightly annealed in a closed space, and the annealed tube blank is slowly cooled in the closed space to reach the temperature of at least 500 DEG C below and then is naturally cooled, so that brilliance appears on the surface of the tube blank, and carbon removal can be avoided; through the coarse stretching, the tube blank can meet the same quality requirement of a stretched straight tube; the machining situation does not need to be frequently monitored after the tube blank is fed, and equipment can automatically stop running and give a prompt after manufacturing is finished; a fine stretching device is simple and convenient, the energy consumption is greatly reduced, and the working efficiency is also improved; in addition, a cutting device for cutting the metal tube is driven by a motor and an air cylinder, and multiple groups of metal tubes can be machined in one step, so that the efficiency is high, the cost is low, and convenience in maintenance can be achieved.

Description

technical field [0001] The invention relates to the field of metal pipe manufacturing, in particular to a metal pipe manufacturing method. Background technique [0002] At present, metal pipes are roughly divided into two processing methods: one is rolling, which is processed step by step through a rolling mill; the other is pipe drawing, which processes the pipe step by step through a drawing machine. The advantage of rolled pipe is that the quality of the inner and outer surfaces is high, and the mechanical properties are stable after solid solution treatment; the disadvantage is that the size of the rolled pipe is difficult to make too small, usually it is difficult to achieve a capillary below 6mm, and the other is the quality of the rolled pipe. The precision is low. For example, the outer diameter is 6mm, and the corresponding tolerance is difficult to control within ±0.02mm. In addition, the rolling efficiency is low, and the production cycle is long. The advantage o...

AI Technical Summary

Problems solved by technology

In addition to the fact that the size can be made very long, the biggest advantage of this type of processing method is that it can be actually automated and the efficiency is very high. This type of pipe has passed a certain pressure test and is usually used in shipbuilding, oil circuits, heaters, medical needles, etc. In industries with low dimensional accuracy requirements, but because of its low accuracy, especially the low dimensional accuracy of the inner diameter and the poor quality of the inner surface, it has not been able to be used in more precise fields, such as optical communications, glass packaging, aerospace, etc.

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