When cutting metal, the saw blade serration cuts off the chips on the one hand, and the saw blade itself itself is damaged. The saw blade tooth damage is mainly in the form of wear and tear. The former is continuous wear and tear; the latter includes brittle fracture (such as chipping, breaking, annealing, etc.) and plastic damage. After the saw blade is worn, the machining accuracy of the workpiece is reduced, the surface roughness is increased, the cutting efficiency is lowered, the cutting temperature is increased, and even vibration is generated, and normal cutting cannot be continued. Therefore, tool wear directly affects machining efficiency, quality and cost.
As the saw blade lengthens, the tool wear increases. According to the cutting experiment, the tool wear process can be divided into three stages: the initial wear stage, the normal wear stage, and the tool wear to a certain limit in the sharp wear stage cannot be used continuously. This wear limit is called the blunt standard. The actual cutting time that a new saw blade (or re-grinded saw blade) has experienced from the start until it reaches the blunt standard is the service life of the saw blade. The diamond-coated saw blade has the characteristics of fast cutting speed, good effect and long service time, especially when cutting a special material that is easy to crack. It is an environmentally-friendly and high-tech new saw blade before the slave, so it is widely recommended.