Tool life (durability): refers to the length of time the tool is used before it reaches a certain level of wear.
Flank wear is the most commonly used evaluation index, because this wear has a significant impact on the geometric dimensional accuracy of the tool, thus affecting the machining accuracy, and the ISO standard generally wears VB=03-0.5 mm is the maximum acceptable wear, 03 mm is the finishing standard, 05 mm is the roughing standard, which means that beyond this value, the machining accuracy cannot be guaranteed.
In 1907, the American engineer Taylor proposed an empirical formula with good applicability, that is, the famous Taylor formula, which is still widely used.
For a machining, when the workpiece, tool material and tool geometry are selected, the cutting speed is the most important factor affecting the tool life, and the faster the cutting speed, the lower the tool life.
Combine different cutting speeds, v1, v2, v3...., tool life, t1, t2, t3....After taking the logarithmic, the points are traced in the double logarithmic coordinates, and it is found that within a certain range of cutting speeds, these points can be fitted into a straight line. The equation for this straight line is the tool life curve. Tungsten carbide
The life of the machined workpiece material steel, cast iron, and cemented carbide tools is significantly higher than that of high-speed steel.