Sensitivity of springback and section deformation to process parameters in rotary draw bending of thin-walled rectangular H96 brass tube

In order to study the effects of the process parameters on springback and section deformation, a sensitivity analysis model was established based on the combination use of the multi-parameter sensitivity analysis method and the springback/section deformation prediction finite element model, and by using this model the sensitivities of the springback and the section deformation to process parameters were analyzed and compared. The results show that the most sensitive process conditions for springback angle are the boost speed and the pressure of pressure die, and the most sensitive process condition for section deformation is the number of cores. When the clamp force, the boost speed and the pressure of pressure die are utilized to control section deformation, the effect of these process parameters on springback should be considered. When the process parameters are mainly used to control springback, the effect of these process parameters on the section deformation should be always considered.

H96黄铜棒导电率测试结果的不确定度评定

对金属导体导电率(EC)测试过程中的不确定度来源进行了分析,并对H96黄铜棒的导电率测试结果的不确定度进行了评定。结果表明:金属导体导电率测试过程中的不确定度来源主要包括环境温度测量、试样标距长度、直径测量、电阻测量以及数值修约等;H96黄铜棒导电率测试结果的不确定度报告为EC=54%IACS,U=2%IACS,k=2。