Please explain the reasons, thank you.
General normal processing is to wear, is the material to wear to wear, who never saw the knife grinding. If the grinding is not ideal, or choose the wrong tool, that some parts will aggravate the friction, natural wear faster, even a knife, of course, it does not belong to the scope of the wear.
This is actually a lot, your cutting parameter is reasonable, whether there is sufficient cooling, the tool material is with workpiece materials, precision machine tools, precision knife handle.
Phase change wear. Because of the increase of cutting temperature, the metallographic structure will change, and the hardness of the cutting tool will decrease, which will lead to wear.
Oxidation wear. In a relatively high temperature (700~800 DEG C), the tool material surface oxidation will occur with the oxygen in air to form a layer of low strength of oxide film, film can easily be workpiece or cutting tool wear off, cause.Diffusion wear. Under the condition of high temperature (850~1000 DEG C), the Ti, W, Co and other elements in the cutting tool material will gradually spread to the workpiece or the chip, and the Fe elements in the workpiece material will also spread to the surface of the cutting tool. In this way, the chemical composition of the cutting tool material is changed, and the hardness and the wear resistance of the cutting tool are decreased, thereby increasing the wear of the tool.
abrasive wear. During the cutting, the hard point of the workpiece material or the chip fragments which are bonded on the workpiece and the chip will cut the grooves on the surface of the cutting tool to make the tool wear. This is mainly caused by mechanical friction, also known as mechanical wear.adhesive wear. When cutting the plastic material, there is a great pressure between the tool and the workpiece and the chip. Because of the cutting movement, after the bonding point is broken, the particles on the surface of the cutting tool are taken away, resulting in tool wear.
