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根据热成形模具温度与应力的相互关系及变化规律,应用ABAQUS软件对超高强钢板热成形过程进行了热力耦合数值模拟。分析表明:凹、凸模圆角与板料接触最早且接触时间最长,模具圆角处产生热应力集中;模具温度在淬火初期达到最大值,随着淬火的进行,模具温度冷却速度逐渐减小;模具热应力在2.5 s内变为325 MPa,热应力较高的变化频率及过大的变化幅值,极易造成模具热疲劳;模具温度及热应力曲线表明,温差是产生热应力的原因,并随温度变化;无热传递条件下进行模具机械应力分析,测量后得到模具应力、热应力、机械应力比为:11.25∶10.31∶1,热应力比重极大。
According to the relationship between the temperature and the stress of the thermoforming mold and its variation, the thermo-mechanical coupling numerical simulation of the thermoforming process of the ultra-high strength steel sheet was carried out by ABAQUS software. The results show that the contact angle of the concave and convex round with the sheet is the earliest and the contact time is the longest, and the thermal stress is concentrated at the fillet of the mold. The mold temperature reaches the maximum value in the initial stage of quenching. As the quenching progresses, The mold thermal stress becomes 325 MPa in 2.5 s, the higher the change frequency of thermal stress and the too large change amplitude, it is easy to cause the mold thermal fatigue; the curve of mold temperature and thermal stress shows that the temperature difference is the thermal stress Reason, and with the temperature change; without heat transfer under the condition of die mechanical stress analysis, after measuring the die stress, thermal stress, mechanical stress ratio: 11.25: 10.31: 1, the proportion of thermal stress is extremely large.