CAJ | 학술논문

采用氧化锆做绝缘阴模材料,设计研制能对压制中的粉末施加冲击电流的模具.研究电容组在不同的充电电压下,对处于不同压制压力下的汽车带轮用粉末瞬时放电,当电能以冲击电流的形式通过后,可引起压坯密度的变化.实验结果表明,施加冲击电流后,压坯密度增加,充电电压越高或粉末压坯初始密度越低,冲击电流对压坯密度增长的贡献越大.冲击电流作用后压坯温度升高,直径发生收缩,说明压坯密度增加是冲击电流的热效应与电磁效应共同作用的结果.
채용양화고주절연음모재료,설계연제능대압제중적분말시가충격전류적모구.연구전용조재불동적충전전압하,대처우불동압제압력하적기차대륜용분말순시방전,당전능이충격전류적형식통과후,가인기압배밀도적변화.실험결과표명,시가충격전류후,압배밀도증가,충전전압월고혹분말압배초시밀도월저,충격전류대압배밀도증장적공헌월대.충격전류작용후압배온도승고,직경발생수축,설명압배밀도증가시충격전류적열효응여전자효응공동작용적결과.
The pressing mould with die made of insulating material of ZrO2 was developed to apply surge current to compaction of powders using for automobile parts. Tests were conducted by using the capacitor bank under conditions of different charged voltages and different pressures. The surge current produced by discharging from the capacitor bank was passed through the steel powders as soon as it was compacted. It is found that the density of powder parts increases as surge current is applied to compaction of steel powders. Higher the voltage is or lower the part’s initial density is, greater the contribution of surge current for the density increase of powder part is. The test results show that the temperature increases and the diameter contracts as surge current is applied to the compacted part. The thermal effect and electromagnetic effect are main factors that affect the density of powder parts.