The cutter wear process of the cutting machine can be divided into three stages:
1. Initial wear stage
The cutters of the cutting machine have a quick initial wear process and a short time. The sharpening of the surface of a newly sharpened tool is prominent. During the friction with the chips, the pressure is not uniform, and the pressure at the peak is very large, causing the peak to be quickly worn away, so that the pressure tends to be even and the wear speed is slowed down.
2. Normal wear stage
The cutter surface of the cutting machine is initially worn, the peak point is smoothed, the surface pressure tends to be even, and the wear amount VB of the cutter increases uniformly with time. The wear curve at this stage is basically linear, and its slope represents the wear strength, which is an important indicator for comparing tool performance.
3. Rapid wear stage
After the normal wear stage of the cutter of the loader, the cutting edge has become dull, the cutting force and cutting temperature rise sharply, the cause of wear changes qualitatively, the surface of the tool is fatigued, the performance is degraded, the wear amount VB increases sharply, and the tool will quickly fail. .
Cutting machine tool blunt standard:
If the tool wears to a certain limit, it cannot be used any more. This wear limit is called the cutter blunt standard.
Cutting machine tool life:
The actual cutting time experienced by a new knife (or re-sharpened tool) from the start of use until the blunt standard is reached is called the tool life of the cutting machine.