CAJ | 학술논문

目的：研究楔横轧凹心产生的原因以及变温度场对端面凹心的影响。方法采用数值模拟的方法，详细分析了楔横轧变形规律下凹心产生的原因。同时利用Deform-3 D用户子程序方式，给轧件端部添加一定形式的变温度场，分析了变温度场改善凹心缺陷的机制；研究了变温区表面温度与变温度场长度对凹心深度的影响。结果楔横轧凹心是由轧至极限料头长度Imin时，端面金属变形不均匀引起的，凹心深度随着变温长度的增加和变温区表面温度的减小而减小，结论所提变温度场楔横轧轧制工艺，可以有效改善端面变形的均匀性，添加此变温度场可以有效减小楔横轧凹心深度。
목적：연구설횡알요심산생적원인이급변온도장대단면요심적영향。방법채용수치모의적방법，상세분석료설횡알변형규률하요심산생적원인。동시이용Deform-3 D용호자정서방식，급알건단부첨가일정형식적변온도장，분석료변온도장개선요심결함적궤제；연구료변온구표면온도여변온도장장도대요심심도적영향。결과설횡알요심시유알지겁한료두장도Imin시，단면금속변형불균균인기적，요심심도수착변온장도적증가화변온구표면온도적감소이감소，결론소제변온도장설횡알알제공예，가이유효개선단면변형적균균성，첨가차변온도장가이유효감소설횡알요심심도。
ABSTRACT:The aim of this work was to study the generation mechanism of cross wedge rolling ( CWR) end concavity and the influence of non-uniform temperature filed on the end concavity. The generation mechanism of end concavity under the deformation rule of cross wedge rolling was detailed analyzed with numerical simulation. Meanwhile, by adding a cer-tain form of non-uniform temperature field on the billet end through Deform-3D software user-routine method, the mecha-nism that the non-uniform temperature field decreases the depth of the end concavity was analyzed. The influences of the billet surface temperature and the length of the non-uniform temperature area on the depth of end concavity were studied. The results showed that the end concavity was caused by the uneven metal deformation in the end face when the CWR mod-ule rolled to the critical end length Imin . The depth of the end concavity decreased with the increase of the length of the non-uniform temperature area and the decrease of the billet surface temperature. The CWR process under non-uniform tempera-ture field mentioned in this paper could effectively improve the uniformity of the deformation of billet end. Therefore, the CWR’s end concavity could be effectively decreased through adding non-uniform temperature field.