The article analyzes characteristics and abrasion factor of leather cap type pig according operation feature, and then proposes reasonable magnitude of interference.

The maximum and the minimum magnitude of interference of the shield canister and the magnet steel hoop are calculated,and the shield and the magnet steel hoop are fitted by shrin.

By reducing the hydraulic oil pressure of the grinding roll in operation,enhancing the magnitude of interference fit between the roll core and the roll ring,and increasing the junction area between .

The finite element method is applied to simulate the cold expanding of the joint as well as the bell and spigot fitting process of internal and external pipes, therefore to determine the interference and overlapping length, analyze the joint forces and give the uniform strength condition of joint and pipe.

The analysis results show tha t the larger interference between the spindle and the toolholder or a higher draw bar force is benefit to improving th.

Analysis and experiment of the optimum shrink range between chain plate and bush for agricultural machinery chain by using finite element method;

This paper calculates the stresses, displacements, permanent bore enlargement, excess, degrees of autofrettsge and push force in secondary mechanical autofrettage technique of thick-walled cylinders with bilinear materials.

In this paper,the crucial calculating formulas for stresses, displacements, excess, degrees of autofrettage, permanent bare enlargement and push force etc.

The research on amount of interference for shrink-on cylinder;

Considering the interference fit between axle and wheel and mesh refinement in the high stress gradient zone,the influence of axle design parameters on the contact pressure between axle and hub is investigated.

The driving gear for SDD8 diesel locomotive was redesigned through optimization of parameters,materials,heat-treatment and optimizing interference fit.