This paper,based on the main and failure types of cold blunt mold,such as cotlapsing,worn-away and splitting,studies the durability of fatigue failure of punches.

This paper presents a new kind of tap durability counting empiric formula which is set up by the author using the mathematical regressive analysis method.

This paper expounds the special prop erties of stainless steel and,from a spects of the s election and determi-nation of the material,durability a nd cutting data,etc .

The relationships between cutting speed, feed rate, cutting depth and cutting tool life and surface roughness are researched and the wear mechanism is analyzed.

S tools treated by magnetic field when cutting45 steel and revealed the main reasons which may influence the cutting tool life treated by magnetic field.

A new method of AC magnetization treatment to improve endurance of high-speed steel tool was put out.

The jam of grinding wheels is a key factor that affects the endurance of grinding wheel.

The relationship between endurance of hard alloy cutter edge and the e dge angle is investigated through simulating the process of cutting polyester st aple with a self-made miniature fiber cutting equipment.

The cutter geometry angle s effect on durable degree and configuration error is discussed,the process principle of grinding the cutter faces a rear flank on a special way on grind gear machine is analyzed.

Affectting factors of cutting wheel in efficiency? wear-resistanceetc.

A model of durable tolerance of sport turf was established in this study according to on-the-spot sampling, together with and different treatments of trampling.