CAJ | 학술논문

根据变厚度轧制特点和前滑定义，推导了一种变厚度轧制的前滑值的理论模型.用MARC软件建立变厚度轧制的有限元模型，针对四种不同变厚度区形状的轧件在轧制摩擦因数为0.08和0.1工况条件下的轧制过程进行了数值模拟.此外，采用轧制试验方法实测了总前滑量.对比分析结果表明：前滑理论模型的计算值与有限元数值模拟结果接近，两种方法计算所得前滑值的差值小于0.005.与常规恒厚度轧制中稳定前滑值不同，在变厚度区轧制时，前滑值在0.02~0.10波动.变厚度区的压下率越大，其前滑值也越大；较小变厚度区斜度设计和低的摩擦因数会使变厚度轧制有更好的轧制稳定性和小的前滑波动范围. TRB变厚度轧制试验也验证了前滑理论模型的精度.减薄轧制实测前滑值和计算值偏差大与变形区应变状态及增加的打滑趋势有关.
근거변후도알제특점화전활정의，추도료일충변후도알제적전활치적이론모형.용MARC연건건립변후도알제적유한원모형，침대사충불동변후도구형상적알건재알제마찰인수위0.08화0.1공황조건하적알제과정진행료수치모의.차외，채용알제시험방법실측료총전활량.대비분석결과표명：전활이론모형적계산치여유한원수치모의결과접근，량충방법계산소득전활치적차치소우0.005.여상규항후도알제중은정전활치불동，재변후도구알제시，전활치재0.02~0.10파동.변후도구적압하솔월대，기전활치야월대；교소변후도구사도설계화저적마찰인수회사변후도알제유경호적알제은정성화소적전활파동범위. TRB변후도알제시험야험증료전활이론모형적정도.감박알제실측전활치화계산치편차대여변형구응변상태급증가적타활추세유관.
Based on the characteristic of variable gauge rolling and the definition of forward slip, a forward slip theoretical model was proposed in this article. A finite element model was also established with MARC software. The rolling processes of four different variable gauge strips were numerically simulated at the rolling friction coefficient of 0.08 and 0.1. In addition, the total amount of for-ward slip was measured by an experimental rolling approach. After comparison and analysis, it is found that there is little difference be-tween the value calculated by theoretical forward slip model and the one simulated by finite element method. The difference is less than 0.005. Differing from stable forward slip in tradition constant thickness rolling, the forward slip fluctuates from 0.02 to 0.10 in the variable gauge rolling process. The increase of reduction rate in the variable gauge zone leads to a higher forward slip. A smaller slope of the variable gauge zone and the low friction coefficient result in a better rolling stability and a smaller fluctuation of forward slip. The experiment of TRB rolling also verifies the accuracy of the theoretical forward slip model for variable gauge rolling. The large tolerance between the measured value and the calculated one in thinning rolling is probably caused by the strain condition of deformation area and the increasing slip tendency.