Abstract: In this paper, we use IMP software to simulate different screws. First, we have designed experiments to verify the reliability of the simulation software. And by the comparison between the experiment results and the simulation results, we have verified that the software is accurate and reliable, then we can use the software to simulate the plasticizing process of different screws, and we can avoid doing a great deal of complicated experiments to obtain regular results. For studying the effects of metering depth and metering pitch on building pressure of screws, we have simulated some screws which are different in metering depth or metering pitch. And we get the pressure along the screws. By analyzing the pressure curve along the screws or the pressure gradient, we get the relations between the metering depth and the pressure developing capability, or the relations between the metering pitch and the pressure developing capability. The results show that the smaller depth or pitch gives the stronger pressure developing capability..

Key words: metering depth, metering pitch, IMP software, building pressure capability