1. Early wear stage
The cutters of the cutting machine wear quickly and the time is short. A newly sharpened tool has sharp peaks on the surface. In the process of friction with the chips, the pressure is uneven, and the pressure at the peak point is large, causing the peaks to be quickly worn, making the pressure tend to be uniform and the wear rate slowing down.
2. Normal wear stage
The surface of the cutter of the cutting machine is worn out in the early stage, and the peak point is flattened. The pressure on the surface tends to be even, and the amount of wear of the cutter VB uniformly increases with time. The wear curve at this stage is basically linear, and its slope represents wear strength, which is an important indicator for comparing tool performance.
3. The rapid wear stage
After the cutting tool of the load breaker has gone through the normal wear stage, the cutting edge has become blunt, the cutting force and cutting temperature have risen sharply, the cause of wear has undergone qualitative changes, the surface of the tool is fatigued, the performance is reduced, the amount of wear VB sharply increases, and the tool will quickly fail .
Standard for blunt cutting tools:
If the tool wears to a certain limit, it cannot be used. This wear limit is called the blunt standard of cutting machine tools.
Tool life of cutting machine:
The actual cutting time of a new knife (or a re-sharpened tool) from the beginning of use until it reaches the blunt standard is called the tool life of the cutting machine.