A Weapon Pipe Hydrostatic Extrusion Machine Design And Numerical Simulation Of The Extrusion Process

The properties of material for weapons become more and more important, in order to meet the demand of the lightweight of weapons, with the development of the defense industry. Magnesium alloy get great attention from the defense department in every county for its advtanges,such as lower density,higher strength ratio, higher stifness ratio, good heat dissipating performance and considerable reserves. It has been proved that hydrostatic extrusioning magnesium alloy has a better mechanical properties than common extrusion and casting by the domestic and foreign researchers. Therefore, it’s necessary to research the hydrostatic extrusion apparatus and the process parameters of hydrostatic extrusion.Three beam four pillars structure which is based on no back-pressure hydrostatic extrusion with mandrel,was choosed as the design scheme of hydrostatic extrusion apparatus in the paper. The structure of its main parts was designed. The finite element analysis results provides that material utilization rate of static beam is low,so we decided to do topology optimization for it.The topology optimization objective was the mass of the static beam,and the stiffness of it was defined as constraint.The topology structure of static beam was gotten by the topology optimization of static beam,and we designed a new structure based on it. By the finite element analysis,the stiffness of the new structure is almost same as the one before optimizing,and the weight has redued32.45%.The result improves that the topology optimization is reasonable.For the problem of expand extrusion and shrink extrusion of magnesium alloy tubes, hydrostatic extrusion of AZ80magnesium was simulated by using Deform-3D and orthogonal test in different conditions such as die angle, calibrating strap length,billet temperature,die temperature,extrusion speed. The analysis results shows that the influence of every factor to extrusion load, billet stress,temperature,as well as their combination which can make the extrusion load smallest.It can provide support for the optimized design of process parameters of AZ80magnesium alloy hydrostatic extrusion.