论文部分内容阅读
针对淬硬轴承钢的干态车削过程,在Abaqus中建立考虑PCBN刀尖半径的热力耦合三维有限元切削模型。首次仿真预测出周期性绝热剪切引起的三维锯齿形切屑,并且切屑在刀屑接触面上的特征线和材料挤压流动方向,以及切屑自由表面沿进给量方向和沿切削深度方向的切屑形态与实际加工形成的切屑形态都能够很好的吻合。通过对切削力、切削温度,切削力和切屑形态预测分析,并与实验数据的比较,揭示了刀尖半径和主偏角对切削过程的影响。研究发现:刀尖半径增大到0.8mm时,工件材料挤压变形更显著,平均切向力增大了17N,与实验结果比较相符。斜角切削过程中材料受到的挤压变形力更大,温升更加明显,最高温度达到1289℃,与试验测量的切削区平均温度1100℃接近;预测的平均切向力为150N,与实验值相差只有7%。
Aiming at the dry turning process of hardened bearing steel, a thermodynamic coupled 3D finite element model considering PCBN nose radius was established in Abaqus. The first simulation predicts three-dimensional sawtooth-shaped chips caused by periodic adiabatic shearing, and the characteristic lines of the chips on the chip contact surface and the direction of material extrusion flow, as well as the chip free surface along the feed direction and along the chip depth direction Form and the actual processing of the formation of the chip morphology can be well matched. By cutting force, cutting temperature, cutting force and chip morphology prediction analysis, and compared with the experimental data, reveals the tip radius and the main angle of the cutting process. The results show that when the tool nose radius is increased to 0.8mm, the extrusion deformation of the workpiece material is more remarkable, the average tangential force increases by 17N, which is in good agreement with the experimental results. In the process of bevel cutting, the material is more compressive and deformable, and the temperature rise is more obvious. The maximum temperature reaches 1289 ° C which is close to the average temperature of the cutting zone measured by the test. The predicted average tangential force is 150 N, A difference of only 7%.