The influences of spinning speed,bonding area and roller pressure on the permeability performance of PET spun-bonded prefabricated vertical drain filters were tested and analyzed.

The stress field, rolling force and rolling torqueand so on havebeen calculated andanalyzed following timeincrement steps.

Analyzing and dealing with the field data of rolling in the processes of medium and heavy plate rolling applying the technique of GP,means of determination are obtained for computational model and correlation parameters about non-linear regression of the rolling torque.

Through the analysis of process parameters,measured on-line in four high reversal rolling mill,the correlation characteristic among every parameters of rolling force, stress at stand corner,rolling torque,rolling current and revolution velocity of main motor, and roll gap were investigated The accuracy of rolling torque was also estimated by using rolling force and rolling current.

Research on rolling moment model of medium plate finishing rolling mill;

Rolling force and rolling moment are the important parameters when cross rolling wedges mills forming automobile semi-axes was designed.

It is important basic research of accurately calculating rolling force and rolling moment to develop heavy cross wedge rolling mill.

In this article,phenomenon causing slippage of roll face between working roll and backing roll for four high mill is analyzed and it is pointed out that increasing equilibrant of working roll can not prevent slippage phenomena foom occurring The criterion is delivered,when the slippage phenomenon appeared.