电磁动态金属粉末注射成型型坯结构性能的研究

利用自行设计的电磁动态注射机DPII-90，对不锈钢金属粉末316L和粘结剂的混合喂料进行稳态和动态注塑成型实验，研究振动参数对金属粉末和粘结剂混合喂料的均匀化和密实机理的影响。实验结果表明，各动态成型条件下的型坯密度明显大于稳态成型条件下的密度。当振动频率（或振幅）不变时，随着振幅（频率）的增大，型坯密度呈非线性增大，达到最大值后缓慢下降，存在一个最佳值。在频率7Hz-10Hz，振幅50μm～150μm的范围内，注射出的型坯密度较高，密实性好。电镜扫描（SEM）发现，金属粉末与粘结剂的分散均匀和完善程度的变化规律和型坯密度随着振幅（频率）的变化规律基本一致。

Research on Structural Performance of Green Parts for Electromagnetic Dynamic Metal Power Injection Molding

An experiment was carried out on the blend of metal power 316L/binder under steady and dynamic molding conditions using the self-made electromagnetic dynamic injection machine DPII-90.The effects of vibration parameters on the uniformity and densification of metal power 316L/binder were studied.Results show that the density of green parts under dynamic molding conditions is obviously higher than under steady molding conditions.The increase of green parts's density is nonlinear under a given frequency(or amplitude) with the increase of amplitude(or frequency).The density decreases slightly as it reaches to a max value.The densification of green parts is better in the frequency range of 7 Hz~10 Hz and vibration amplitude range of 0.05 mm~0.15 mm.SEM showed that the change of uniform dispersion and distribution is basically accordant with the change of density with vibration amplitude(frequency).