镍基结合剂选区激光烧结制备砂轮过程温度场模拟

Simulation on temperature field in selective laser sintering of nickel-bonded for preparation of grinding wheel

利用有限元分析软件ANSYS编制了一种新的非线性计算方法,对砂轮烧结制备中的温度场进行了模拟。仿真结果表明：熔池最高温度随扫描的进行逐渐升高,激光功率越大和扫描速度越小,熔池的温度越高,熔池的深度越深,在多道烧结中由于热量的积累导致烧结温度过高（超过了1550℃）,为防止CBN转变为HBN,可以采用逐道降功率的方式降低熔池温度。进行了选区激光烧结试验,试验测温与模拟温度吻合,表明此仿真模型可以较好地模拟砂轮制备中温度场的动态分布,有助于试验参数的选择。

A new nonlinear calculation method was developed to simulate the temperature field in the process of grinding wheel sintering by the finite element analysis software ANSYS.The results show that the maximum temperature of the molten pool will increase with the scanning.The higher the laser power and the smaller the scanning speed,the higher the temperature of the molten pool and the deeper the depth of the pool is.In the multi-channel sintering the sintering temperature will be too high（ over 1550 ℃） due to the accumulation of heat.In order to prevent CBN from turning into HBN,the temperature of molten pool can be reduced by way of decreasing the laser power per layer.The selective laser sintering experiment is carried out.This simulation model can adequately simulate the dynamic distribution of the temperature field in the grinding wheel preparation by comparing the experimental temperature with the simulated temperature,which will help to the selection of experimental parameters.