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热锻模在进行连续锻造时,型腔表层受到循环的机械载荷与激冷激热载荷,导致模具表层产生疲劳裂纹与失效。采用多层金属模具结构可以缓解热锻模所受热力载荷、提高热锻模的高温磨损性能以及热-机械疲劳磨损寿命。以直齿圆柱齿轮坯的锻造为例,利用有限元模拟和计算模型获得了均质热锻模和多层金属热锻模在连续热锻条件下的循环温度场和应力分布。结果表明,相对均质热锻模,以钴基合金为覆层、高速钢为过渡层的多层金属热锻模可以有效改善模具表层温度和应力分布;在一定程度上揭示了多层金属模具结构在热锻服役条件下的力学行为。
Hot Forging Die During continuous forging, the cavity surface is subjected to cyclic mechanical load and chilling heat load, resulting in fatigue cracks and failure on the mold surface. The multi-layer metal mold structure can relieve the thermal load on the hot forging die, improve the high temperature wear resistance of the hot forging die and the thermal-mechanical fatigue wear life. Taking straight forging of cylindrical gear blank as an example, the cyclic temperature field and stress distribution of homogeneous hot forging die and multi-layer metal hot forging die under continuous hot forging conditions were obtained by finite element simulation and calculation model. The results show that the relative homogeneity of hot forging die, cobalt-based alloy as the coating, high-speed steel as the transition layer of multi-layer metal hot forging die can effectively improve the mold surface temperature and stress distribution; to a certain extent, reveal the multi-layer metal mold Mechanical Behavior of Structure under Hot Forging Service.