A Five-Stand Confined Mandrel Continuous Rolling Mill Conducive to Reducing Roll and Mandrel Consumption

Abstract

The invention relates to a five-stand restrained mandrel continuous rolling mill which is beneficial for reducing the consumption of rolls and mandrels. It can reduce the rolling force of the rack, limit the force to the rack, reduce the steel consumption per ton of the roll and the mandrel, and save the tool cost. The pass is an ellipse-round pass system, the fourth stand and the fifth stand of the five-stand restrained mandrel continuous rolling mill respectively adopt the arc side wall round pass without eccentricity, and the fourth stand The pass is the same as that of the fifth stand, and it is characterized in that: the first stand to the third stand of the five-stand restraint continuous mandrel rolling mill adopt an elliptical pass with eccentricity, and the eccentricity of the next stand is taken as Half of the previous frame, the eccentricity of the first frame is set to 0.645 times of the thinnest wall thickness of the steel pipe rolled by the design pass, the connection angle of the second frame and the third frame is set to 14°; the fourth frame , The connection angle of the fifth rack is set to 9°.

Description

(1) Technical field [0001] The invention relates to a continuous rolling mill for processing seamless steel pipes, which belongs to the field of mechanical processing equipment, in particular to a five-stand limited mandrel continuous rolling mill which is beneficial to reducing the consumption of rolls and mandrels. (2) Background technology [0002] Due to the characteristics of high degree of automation, high production efficiency and metal yield, and good wall thickness precision for producing steel pipes, the limited motion continuous rolling mill has been widely used in the world. At present, there are more than ten sets of continuous rolling mills of this type in China, and the core equipment continuous rolling mills and processing technology are all imported. The pass design method is that the first frame is slightly eccentric, and the rest of the frames are arc-shaped side walls without eccentricity. Round pass, the most prominent feature of this type of pass is tha...

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Problems solved by technology

At present, there are more than ten sets of continuous rolling mills of this type in China, and the core equipment continuous rolling mills and processing technology are all imported. The pass design method is that the first frame is slightly eccentric, and the rest of the frames are arc-shaped side walls without eccentricity. Round pass, the most prominent feature of this type of pass is that the consumption of rolls and mandrels is relatively large, so steel pipe manufacturers with limited-movement mandrel continuous rolling mills have a large reserve of mandrels, which has caused great harm to the enterprise. For example, the mandrel reserve of the Dalmine steel pipe factory in Italy has reached more than 100 million euros

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