Abstract：The wall thickness eccentricity control of hollows rolled by a three-roll tube mill is an important part of the wall thickness precision control of seamless steel tubes. Based on production trials,this paper analyzes the characteristics of the wall thickness eccentricity of hollows,establishes the theoretical calculation model of the wall thickness eccentricity of three-roll rolled hollows using analytical methods,carries out the prediction calculation and comparison according to the actual production conditions,analyzes the influence characteristics of the three-roll rolling process factors on the wall thickness eccentricity of hollows,and further discusses the methods to improve the wall thickness eccentricity of hollows. The results show that the basic characteristics of the wall thickness eccentricity of hollows are "eccentric screw type",accounting for more than 80% of the uneven wall thickness of hollows. The eccentricity of the wall thickness and temperature in shells are the most important factors affecting the wall thickness eccentricity of the three-roll rolled hollows. Increasing the reduction of the three-roll rolling,reducing the temperature of shells,increasing the height of the roll shoulder,and increasing the rotation speed of the rolls are conducive to reduce the wall thickness eccentricity of hollows.
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2020, Vol. 55 
