基于ABAQUS的滚刀破岩参数对滚动力及比能的影响

摘要

目的 研究滚刀破岩过程中,贯入度与滚刀所受平均滚动力之间的相应关系,分析刀间距、贯入度以及线速度三因素对比能的影响.方法 利用ABAQUS有限元仿真软件,建立双滚刀直线切割大理岩的运动模型,模拟5种不同贯入度的滚刀破岩过程,得出不同贯入度条件下滚刀所受平均滚动力的大小;基于正交试验法,选出具有代表性的三因素三水平的参数组合进行仿真,通过极差分析找出不同因素变化对比能的影响规律.结果 贯入度由4mm增加到8mm,滚刀所受平均滚动力近似线性增长,变化平缓;贯入度由8 mm增加到12 mm,滚刀所受平均滚动力增长幅度大,变化明显.正交试验中,刀间距对比能的均值极差为0.96 MJ/m3;贯入度对比能的均值极差为0.41 MJ/m3;线速度对比能的均值极差为0.26 MJ/m3.结论 在刀间距和线速度保持不变的条件下,滚刀所受平均滚动力与贯入度呈正比,而与s/p比值呈反比.通过分析刀间距、贯入度以及线速度变化对比能影响的主次性,得出刀间距影响最大,其次是贯入度,线速度影响最小.研究结果为提高滚刀破岩效率提供了参考.%The relation between penetration depth and average rolling force of disc cutters in the process of rock broken was studied.The influence of cutter space,penetration depth and cutting speed on the specific energy was analyzed.The model of linearly cutting marble with double cutter was built by the software ABAQUS.The process of rock broken with five different penetration depths was simulated and the average rolling force of disc cutter was obtained.Based on orthogonal test,the process of rock broken was simulated using representative parameter combinations.There are three factors and three levels in it.The influence of different factors on the specific energy was obtained through range analysis.When the penetration depth increased from 4mm to 8mm,there was approximately linear increase in the average rolling force of disc cutter,changing smoothly.When the penetration depth increased from 8 mm to 12 mm,there was a great increasing range in the average rolling force of disc cutter,changing obviously.In orthogonal test,it was founded that the mean range of specific energy from cutter space was 0.96 MJ/m3,the mean range of specific energy from the penetration depth was 0.41 MJ/m3 and the mean range of specific energy from the cutting speed was 0.26 MJ/m3.If the cutter space and cutting speed keep constant in the simulation,there was a proportional relation between the average rolling force and penetration depth,while it has an inversely proportional relation to s/p.The influences order of cutter space,penetration depth and cutting speed on specific energy were analyzed.It was concluded that the greatest influence for the specific energy was cutter space,the second was penetration depth and the minimal was cutting speeding.The results have an important reference for improving the rock broken efficiency.