【摘要】 重载齿轮轴的激光再制造增材成形过程与复杂的热物理现象相伴,为了获得优良的工艺性能,对磨损轴面激光再制造过程的温度场动态演化行为及其规律进行研究。通过引入基于计算域虚拟规划算法的网格划分理论建立增材再制造齿轮轴的有限元模型(FEM);利用有限元参数化设计语言(ANSYS APDL)建立模拟熔覆层逐渐沉积的瞬态热分析模型。分析结果表明:熔池呈现偏置彗星状的类椭球形态,高温区域(最高2 018℃)分布在光斑中心靠后部位;温度沿深度方向迅速衰退且衰退规律相似,其峰值温度均超过材料熔点(1 440℃),温度沿宽度方向呈不对称的抛物线形;不同周向位置点均产生急冷、急热和滞后的现象。更多还原

【Abstract】 There are a series of complex thermo-mechanical phenomena during additive remanufacturing of heavy duty gear shaft. In order to obtain excellent process performance of remanufacturing gear shaft,dynamic evolution behavior and its evolution rules of temperature field were studied. Methods mesh generation based on computational domain virtual planning algorithms are introduced to build high-quality finite element model for remanufacturing gear shaft. The transient thermal analysis model of additive remanufacturing of heavy duty gear shaft is established to simulate cladding layer deposition based on ANSYS parametric design language. The results show that melting pool shows the shape of ellipsoid. It is different from ellipsoid that there is high temperature center area far away from geometric center shape like comets. Meanwhile the highest temperature( 2 018 ℃) following closely behind mobile laser light spot. Temperature rapidly declines along the depth direction( radial direction) in heavy duty gear shaft and temperature weak rules were similar in different depth nodes. It is noted that peak temperature is above the melting point of material. In addition,temperature is asymmetrical parabolic along the width direction.更多还原