The change in the specific roll pressure of workblanks is investigated as the tool surface roughness and the relative height of workblanks are changed.
探讨了具有不同表面粗糙度的工具和相对高度毛坯，在变形时单位压力的变化情况；
3
The structure, material, specific surface area and roughness of bio media are the important factors influencing the efficiency of in situ bio film technique.