Theoretical analysis and experimental investigations on the symmetrical three-roller setting round process
Theoretical analysis and experimental investigations on the symmetrical three-roller setting round process
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对称三辊定圆工艺的理论分析与实验研究
DOI：
10.1007/s00170-016-9610-4
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发表时间：
2016-10
影响因子：
3.4
通讯作者：
Wang Chunge
中科院分区：
文献类型：
--
作者：
Yu Gaochao;Zhao Jun;Zhai Ruixue;Ma Rui;Wang Chunge
本文对三辊整圆工艺的一系列问题进行了研究。对三辊弯曲提高圆度进行了理论分析，指出每一管壁段都要交替经历多次往复弯曲，阐述了三辊整圆工艺的工艺机理。用数学归纳法证明了多次往复弯曲可以消除和统一管壁各段初始曲率的差异。实验结果表明，随着上辊压下量的增加和弹性面积比的减小，管材的残余椭圆度逐渐减小。当弹性面积比达到20%左右时，残余椭圆度可控制在0. 35%左右，远小于美国石油学会（API）标准的要求。建立了压下量与曲率变化和弹性面积比的定量关系，实现了压下量的预测。但是，为了得到高精度的管材，需要大幅度提高三辊整圆装置的吨位，这是整圆设备制造商和管材制造商需要注意的一个方面。此外，残余椭圆度与初始椭圆度无关，与下辊间距关系不大，主要取决于弹性面积比和合理的工艺参数。
In this paper, a series of problems about the three-roller setting round process are studied. The theoretical analysis of increasing the roundness by three-roller bending is carried out, which shows that every pipe-wall segment alternately experiences multiple times of reciprocating bending, then the process mechanism of the three-roller setting round process is elaborated upon. It is proven by the mathematical induction method that the difference of the initial curvature of each pipe-wall segment can be eliminated and unified by multiple times of reciprocating bending. The experimental results show that with the increase of the upper roller reduction and the decrease of the elastic area ratio, the residual ovality of the pipe decreases gradually. When the elastic area ratio reaches about 20 %, the residual ovality can be controlled at around 0.35 %, which is far less than the requirement of American Petroleum Institute (API) standard. The quantitative relationships between the reduction and the curvature variation and the elastic area ratio are established, so the prediction of the reduction can be realized. However, in order to get the pipe of high precision, it is necessary to greatly increase the tonnage of a three-roller setting round device, which is an aspect that the setting round equipment manufacturers and pipe manufacturers need to notice. In addition, the residual ovality has nothing to do with the initial ovality and has little relation with the lower roller spacing, and it mainly depends on the elastic area ratio and the reasonable process parameters.
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DOI：
10.1016/s1006-706x(14)60050-9
发表时间：
2014-03
影响因子：
2.5
作者：
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2007-05-01
影响因子：
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DOI：
10.1016/j.jmatprotec.2014.08.013
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影响因子：
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