高压扭转工艺具有极强的晶粒细化和粉末固结效果,而且非常适用于回转体零件的生产,为了制备出性能优异的药型罩,将高压扭转工艺应用于铜粉锥形件成形.采用单因素实验法,利用HPT专用液压机、倒置金相显微镜和金相软件系统,以及排水法测相对密度等方法,研究了温度、压力、扭转角速度和扭转圈数对致密度和晶粒尺寸的影响.结果表明：随着温度、压力和扭转圈数的增大,锥形件的致密度和晶粒细化效果都得到了提高,即提高了锥形件的质量;而扭转角速度的影响刚好相反,它的增大降低了锥形件的质量,但幅度较小;从提高生产效力来说,较大的扭转角速度优势更大.
High-pressure torsion（HPT） has strong effect of grain refinement and powder consolidation,and is very suitable for the production of revolution parts.Based on these,HPT was used in forming copper powder cones.The effects of temperature,pressure,rotational angular velocity and number of revolution on the relative density and grain size were studied.The results show that the density and grain refinement of cones are increased by the increasing of temperature,pressure and number of revolution,so that the cones＇ quality is improved.However,the increasing of rotational angular velocity has negative effect on the cones＇ quality,but the effect is very small.Considering of the production efficiency,the bigger rotational angular velocity is better.
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