关键词: 粉末成形固结, 温度场, 应力场, 电磁场, 场相合

Abstract:

In order to implement the powder forming and consolidation with high densification , good property , highprecision , short time and low cost , the theOIγand key technology of powder forming and consolidation are presentedwith regard to the coupling of the temperature and stress fields and the coupling of the electromagnetic field , thetemperature field and the stress field. By using the newly-developed device for the direct measurement of dynamiclateral pressure during powder compacting process , the densification mechanism of Fe-based powders in the coupledtemperature and stress fields is obtained. Then , a numerical simulation of powder densification in the coupled temperatureand stress fields is carried out , and the forming and consolidation process of Fe-based powders is determinedand optimized. Furthermore , an apparatus for the forming and consolidation in the coupled electric , magnetic, temperature and stress fields is successfully developed , which is then used to determine the forming and sinteringprocesses of Fe-based and WC-based powders under multi-field coupling , reveal the corresponding mechanism ,and simulate the temperature distribution in the coupled electromagnetic and stress fields.

Key words: powder forming and consolidation, temperature field, stress field, electromagnetic field, field coupling