压铸模型腔表面热应力理论模型
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摘要
根据热弹塑性理论,建立了多次连续压铸时压铸模型腔表面的热应力模型。以铜合金压铸为例,分析了铜合金压铸时离H13钢模具型腔表面不同距离点的热应力-时间变化曲线。结果表明,离压铸模型腔表面距离越近的点热应力值及波动幅度越大。离铜合金压铸模表面3mm以内区域以低周热疲劳失效为主,5mm以外的区域以高周热疲劳失效为主,3~5mm区域介于高周热疲劳失效和低周热疲劳失效之间。
According to the thermal-elasto-plastic theory,thermal stress model of cavity surface of die casting die during multiple die casting cycles was established,and the thermal stress to time curves of different depth points from cavity surface were analyzed.The results reveal that the point at the near distance from cavity surface exhibits a large thermal stress and thermal stress fluctuation.The die surface area within 3 mm is controlled mainly by low cycle thermal fatigue failure,while the area outside 5 mm is dominated by high cycle thermal fatigue failure,and the 3~5 mm region is between high cycle thermal fatigue failure and low cycle thermal fatigue failure.
According to the thermal-elasto-plastic theory,thermal stress model of cavity surface of die casting die during multiple die casting cycles was established,and the thermal stress to time curves of different depth points from cavity surface were analyzed.The results reveal that the point at the near distance from cavity surface exhibits a large thermal stress and thermal stress fluctuation.The die surface area within 3 mm is controlled mainly by low cycle thermal fatigue failure,while the area outside 5 mm is dominated by high cycle thermal fatigue failure,and the 3~5 mm region is between high cycle thermal fatigue failure and low cycle thermal fatigue failure.
引文
[1]马文超.压铸模失效理论及试验研究[D].武汉:武汉科技大学,2016.
[2]KLOBˇCAR D,TUEK J.Thermal stresses in aluminium alloy die casting dies[J].Computational Materials Science,2008,43(4):1 147-1 154.
[3]PERSSON A,HOGMARK S,BERGSTRM J.Temperature profiles and conditions for thermal fatigue cracking in brass die casting dies[J].Journal of Materials Processing Technology,2004,152(2):228-236.
[4]周玉辉,吴卫,周华彬,等.压铸模使用寿命与优化压铸过程控制[J].铸造设备研究,2005(6):43-45.
[5]王荣滨.化油器铜合金压铸模的选材及热处理工艺[J].专用汽车,1998(1):52-56.
[6]韩雄伟,李欣星,陈祖红.基于ProCAST的铝合金压铸模热应力场数值模拟[J].特种铸造及有色合金,2011,31(9):837-839.
[7]韩雄伟,吴卫,冷真龙.铝合金轮毂压铸模具温度场及热应力场数值模拟[J].特种铸造及有色合金,2009,29(6):516-518.
[8]潘成刚,雷志斌,周家林,等.基于ProCAST和正交试验法优化压铸模具寿命[J].特种铸造及有色合金,2017,37(6):611-614.
[9]HU X P,ZHAO G Q,WU B Y.Temperature change and stress distribution analysis of die surface in Al-alloy die casting process and experimental study on die heat check[J].China Foundry,2008,5(1):47-53.
[10]KLOBˇCAR D,KOSEC L,KOSEC B,et al.Thermo fatigue cracking of die casting dies[J].Engineering Failure Analysis,2012,20:43-53.
[11]平修二.热应力与热疲劳[M].北京:国防工业出版社,1984.
[12]李维特,黄保海,毕仲波.热应力理论分析及应用[M].北京:中国电力出版社,2004.
[13]潘成刚,马文超,肖琴,等.压铸模型腔表面温度场的理论分析[J].特种铸造及有色合金,2016,36(4):385-388.
[2]KLOBˇCAR D,TUEK J.Thermal stresses in aluminium alloy die casting dies[J].Computational Materials Science,2008,43(4):1 147-1 154.
[3]PERSSON A,HOGMARK S,BERGSTRM J.Temperature profiles and conditions for thermal fatigue cracking in brass die casting dies[J].Journal of Materials Processing Technology,2004,152(2):228-236.
[4]周玉辉,吴卫,周华彬,等.压铸模使用寿命与优化压铸过程控制[J].铸造设备研究,2005(6):43-45.
[5]王荣滨.化油器铜合金压铸模的选材及热处理工艺[J].专用汽车,1998(1):52-56.
[6]韩雄伟,李欣星,陈祖红.基于ProCAST的铝合金压铸模热应力场数值模拟[J].特种铸造及有色合金,2011,31(9):837-839.
[7]韩雄伟,吴卫,冷真龙.铝合金轮毂压铸模具温度场及热应力场数值模拟[J].特种铸造及有色合金,2009,29(6):516-518.
[8]潘成刚,雷志斌,周家林,等.基于ProCAST和正交试验法优化压铸模具寿命[J].特种铸造及有色合金,2017,37(6):611-614.
[9]HU X P,ZHAO G Q,WU B Y.Temperature change and stress distribution analysis of die surface in Al-alloy die casting process and experimental study on die heat check[J].China Foundry,2008,5(1):47-53.
[10]KLOBˇCAR D,KOSEC L,KOSEC B,et al.Thermo fatigue cracking of die casting dies[J].Engineering Failure Analysis,2012,20:43-53.
[11]平修二.热应力与热疲劳[M].北京:国防工业出版社,1984.
[12]李维特,黄保海,毕仲波.热应力理论分析及应用[M].北京:中国电力出版社,2004.
[13]潘成刚,马文超,肖琴,等.压铸模型腔表面温度场的理论分析[J].特种铸造及有色合金,2016,36(4):385-388.