高速压制工艺对铁基粉末成形致密化影响规律  

Effect of High Velocity Compaction Process on the Forming Densification of Iron-base Powders

作　　者：谷曼[1] 吕刚[1] 秦强 仇多洋 GU Man;LV Gang;QIN Qiang;QIU Duo-yang(School of Advanced Manufacturing Engineering,Hefei University,Hefei 230601,China)

机构地区：[1]合肥学院先进制造工程学院,合肥230601

出　　处：《合肥学院学报（综合版）》2021年第5期115-120,共6页Journal of Hefei University：Comprehensive ED

基　　金：安徽省科技重大专项“无人操作智能采装一体机研发及其产业化”(201903a05020033);合肥学院人才科研基金项目“铁基粉末高速压制过程中粉体摩擦行为及致密化机理研究”(16-17RC24);合肥学院人才科研基金项目“直角坐标机器人技术应用研究”(18-19RC52)资助。

摘　　要：采用冲击锤对粉末铁基合金Distaloy4600A进行高速压制成形,利用应变检测模块进行试验过程的应变进行数据采集,研究不同高度、不同工艺下金属粉末高速压制成形过程的模具变形、脱模力、压坯相对密度和硬度的变化规律。结果表明:随着冲击锤高度的增加,压坯的相对密度和硬度值均相应增大,且压坯的上、下表面硬度差别逐渐减小,脱模力也迅速增大;单向冲击脱模力明显比浮动阴模大,说明浮动阴模冲击有利于降低摩擦,有利于降低脱模力;通过对压坯进行表面形貌分析获知,压坯密度提高与冲击锤的高度增大密切相关,致密度提升;浮动阴模比单向冲击成形的压坯空隙少,致密度提高。The powder iron-base alloy Distaloy4600A was pressed at high speed by impact hammer and the strain detection module is used for data acquisition during the test process.The changes of the die deformation,the demoulding force,the relative density of the compaction blank,and the hardness in the high speed compacting process of metal powder with different heights and processes were studied.The results show that the relative density and hardness increase according to the increase of the height of the impact hammer,and the demoulding force also increases rapidly.However,the hardness difference between the upper and lower surfaces of the blank decreases gradually.The demoulding force of unidirectional impact is obviously larger than that of floating negative die,indicating that the impact of floating negative die is conducive to reducing friction and demoulding force.Through the analysis of the surface morphology of the blank that the increase of the density of the blank is closely related to the increase of the height of the impact hammer.Increasing density can significantly reduce the gap between the floating die and blank in unidirectional impact forming.

关 键 词：高速压制 粉末冶金 致密化 冲击锤 浮动阴模 

分 类 号：TG376[金属学及工艺—金属压力加工]