基于有限元分析的精冲模温度场及其影响

Temperature field of fine-blanking die and its influence based on finite elenment analysis

为了揭示温度变化对模具零件的影响,采用有限元瞬态结构——瞬态热耦合的方法,建立结构和温度场分析的三维模型,分析模具温度场的分布随模具冲压循环的变化,研究模具零件在此温度场下的变形,并用红外热成像仪对冲压过程中的模具零件进行现场测量,得到的数据与模拟结果相符。研究结果表明:B9棘轮级进模在冲压循环中,第三工位凸、凹模刃口附近的温度能达到135℃左右,凸、凹模的热膨胀使得其间隙比设计时减小了36%,在模具设计时需予以考虑。

In order to reveal the influence of temperature variation on the die, the coupling simulation of transient structure and transient heat by finite element method was used, and 3D models were developed for the analyses of structure and temperature field. The distribu- tion of temperature field in die under the stamping cycle was investigated and the deforma- tion of die in this temperature field was calculated. The die during stamping process was measured by infrared thermal imager and the data obtained were consistent with the simula- tion results. The results indicated that while the B9 ratchet wheel progressive die stamping, cutting edge temperature of the punch and die in the third place reached 135℃ and the clearance between the punch and die was reduced by 36% than that by design due to heat expansion. The change of the clearance needed to be considered in the design of the die.