Experimental Research On Micro Backward Extrusion Process With Amorphous Alloy

With the developing of the modern society, the production miniature is developing rapidly, and the demand quantity of the micro component is getting more and more, the requirement of the miniature makes the micro-forming technology and the micro-mold production emphasis study object of the industry. Amorphous alloy has special properties in mechanics, electrics and magnetic, and its superplastic flow behavior in the supercooled liquid region, fits the miniature process requirements. With the further research, amorphous alloy will have great foreground in the process and the application of the minimized component.The amorphous alloy Zr₅₅Cu₃₀Al₁₀Ni₅ is used as the experiment material. The research productions and experiment methods in and out country are consulted. The backward extrusion is selected as the process style. The isothermal crystallization kinetics and flow behavior are the basement of the experiment. A typical round-cup component is chosen as the forming component, and the micro mold is designed and manufactured. Different temperatures and extrusion speeds are selected to the main process parameters and the extrusion force changes of the amorphous Zr₅₅Cu₃₀Al₁₀Ni₅ are studied with these parameters.Through the experiment, in the backward extrusion process, it is found that the forces will decrease while the temperature rises and forces will increase when the extrusion speed rise. The components are made to microcosmic analysis, and the changes of texture and properties are observed before and after experiment. It is found that nanometer grains appear after forming. Different temperature control methods are selected to observe the experiment results. It is found that to reduce the time the material stays in high temperature can make advantage to material forming. Two kinds of different structures of mold are designed to study the effects on experiments. Different materials are selected to make the punches. And the hard tool steel is found to be the ideal punch material.