球头刀高速铣削模具钢热力分布3D模拟

为了获得球头刀高速铣削模具钢在切削过程中的热力分布状态,为已加工表面的热力形成机制研究提供基础数据,利用基于拉格朗日算法的有限元工艺仿真系统DEFORM,对汽车覆盖件模具钢Cr12Mo V的高速铣削过程进行了3D有限元建模仿真.模型模拟了球头刀在倾角为15°时的切屑形成过程,预测的进给方向、跨距方向以及轴向方向的切削力与实验数据相符,在剪切面处模拟所得切削平均温度偏差在10%以内.模具表面切削区轮廓形状与高速铣削产生切屑形貌基本吻合,证明建立的3D模型能够较好地反应切削过程中的热力分布情况.

3D simulation of thermal-force distribution in high-speed ball end milling die steel

In order to obtain the thermal force distribution state in the cutting process of high speed ball end milling die steel and provide the basic data for the research on the thermal force forming mechanism of machined surface, the 3D finite element modeling and simulation for the high speed milling process of automobile covering parts die steel Cr12MoV was performed with the finite element process simulation system DEFORM based on the Lagrange algorithm. The chip formation process of ball end milling cutter was successfully simulated under the inclination angle of 15° in the model, the predicted cutting force in the feed direction, span direction and axial direction is in good agreement with the experimental data. The deviation between the simulated average cutting temperature on the shear plane and experimental data is within 10%. Furthermore, the simulated contour shape of cutting zone on the mold surface fits well with that of chip morphology in the high speed milling, which can prove that the proposed 3D model can better reflect the thermal force distribution in the cutting process.