In this paper,calculation method for profile error of modified ZI worm hob #is studied Factors that design parameters and relieving technical parameters affect profile error are analyzed theoretically, a new relieving technique called "changing hight of wheel center"is proposed,This creates a new way for the increase of qualified length of hob gear profile.

AHP and gray analysis of the green evaluation index system of grinding process;

Identification and Comoutation of Prediction Model Expressions of Grinding Process;

Research on grinding process of spinning roller;

In this paper,the advantage of Mix-material humidifying grinding process in No.

It has a great influence on the quality of mine's chosen whether the decision of grinding technology is reasonable,so sufficient study on grinding fineness is necessary.