Large thick-wall special-shaped pipe cold roll forming method

Abstract

The invention belongs to the technical field of machine manufacturing, and particularly relates to a large thick-wall special-shaped pipe cold roll forming method. The method comprises the following steps that firstly, at the round pipe selecting stage, a round pipe with the corresponding diameter is selected according to the specification of a needed square pipe or rectangular pipe; secondly, at the rough forming stage, five universal rolling mills are totally arranged, transformation rollers of flat rollers and vertical rollers are adopted for enabling the round pipe to be formed into the needed square pipe or rectangular pipe, wherein the flat rollers and the vertical rollers are symmetric, and the flat rollers are perpendicular to the vertical rollers; thirdly, at the finish forming stage, the square pipe or rectangular pipe formed through rough rolling is subjected to finishing through a sixth flat roller rolling mill, and the square pipe or rectangular pipe can meet various precision requirements; and fourthly, the torsion resistance is adjusted, the square steel pipe or rectangular steel pipe subjected to finishing enters a straightener, the torsion resistance of the square pipe or rectangular pipe is adjusted, the square pipe or rectangular pipe of the needed specification is formed, and accordingly the product quality can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a cold-bending forming method for large-scale thick-walled special-shaped pipes. Background technique [0002] Square and rectangular tubes are the most widely used and most common special-shaped steel tubes. They are also a kind of economical section tubes. Easy to install and so on. Mainly used in construction, medical equipment, high-end furniture, aircraft, automobile, subway, shipbuilding and other industries. With the development of society, all walks of life have more and more demands for large square and rectangular steel pipes. [0003] Steel structure is one of the main structural types of buildings, and it has rapidly developed into an important branch of the construction industry in recent years. At present, in the high-rise buildings over 30 in developed countries, square and rectangular tubes have been widely used in building structur...

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Problems solved by technology

[0006] The present invention provides a large-scale thick-wall special-shaped pipe cold-bending forming method to solve the problem in the above-mentioned background technology that large-scale special-shaped pipes cannot be produced in China at present

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