Knowledge of the use of cutting mold

1. The morphology of the tool wear and its causes
When cutting the metal, the tool cuts off the chips, and on the other hand, the tool itself will be damaged. Tool damage mainly includes wear and damage. The former is continuous gradual wear; the latter includes brittle damage (such as collapse, fracture, peeling, crack damage, etc.) and plastic damage. After the tool wear, the workpiece processing accuracy is reduced, the surface roughness increases, and leads to the cutting force increase, cutting temperature increase, and even produce vibration, can not continue to normal cutting.
Therefore, tool wear directly affects the processing efficiency, quality and cost. Wear tools are used in the following forms:
Front knife face wear
The back blade is worn
Boundary wear
From the degree of temperature dependence, the normal wear of cutting tools is mainly mechanical wear and thermal and chemical wear. Mechanical wear is caused by the marking of the hard points in the workpiece material, heat and chemical wear is caused by the bonding (the tool and the workpiece material contact with the atomic distance), diffusion (the chemical elements of the tool and the workpiece to each other, corrosion, etc.).
2. Tool wear process, grinding blunt standard and tool life
Tool wear was increased with increasing cutting time. According to the cutting experiment, the typical wear curve of the normal wear process of the tool is illustrated. The figure takes the cutting time and the rear blade surface wear amount VB (or the wear depth of the front blade crescent depression KT) as the horizontal coordinate and ordinate coordinates respectively. From the Figure, the tool wear process can be divided into three stages:
Initial wear stage
Normal wear stage
Sharp wear stage
The tool wear to a certain limit can not continue to use. This wear limit is called the grinding standard. The actual cutting time of a new knife (or sharpened tool) from initial use to the grinding standard is called tool life

What are the decisive factors of the service life of the cutting press machine?

Of course, daily maintenance and maintenance is only one aspect, and the operation specifications of the operator of the cutting machine also has a great relationship, incorrect operation is likely to lead to mechanical wear aggravation!
In fact, the world’s machinery is the same, such as the car is the same, if a car used for a long time without the necessary maintenance and rest, then it is necessary to be scrapped in advance, a slightly better car, as long as the maintenance of good and timely can exercise 500,000 kilometers without major failure.
But if there is no timely maintenance, and there is no good driving habits, it is likely to be a lot of faults in the car exercise 20,000 kilometers. Of course, individual cases are not excluded here.