If the hardness is too high to bring the tool too brittle, metal processing of high hardness of the tool will bring any benefits.
Metal processing, the hardness of the tool is not the pursuit of the harder the better, the pursuit of hot. That is, when the temperature is still a certain degree of hardness. Because the temperature of the cutting tool in the process is constantly rising (heating), the hardness decreases with the increase of temperature. For example, high carbon steel cutting tool, the hardness at room temperature is in line with the requirements of cutting, but a heat on the soft, short service life, the old knife to change the knife, can not be sustained continuous cutting.In order to improve the efficiency of production, especially under the conditions of automated production, we must pursue the high temperature of the cutting tool, that is, in the process of cutting, although the temperature increases, but the tool is still hard, sharp, wear-resistant. The purpose is to prolong the service life of the cutter. As a result, the carbide tool on the basis of the emergence of carbide cutting tools (powder metallurgy), in recent years there have been a number of ceramic tools. With the continuous improvement of the degree of automation, metal processing of the hot pursuit of the tool is getting higher and higher.
The high hardness of the tool and the tool wear resistance are closely related (such as the surface of the abrasive wear, generally after the knife surface wear as a tool wear standard), good wear resistance, tool life is high. The high hardness of the cutting tool material, from the material properties of the workpiece is increasing, the most basic concept is: the hardness of the tool must be higher than the hardness of the workpiece, otherwise not cut.A good performance of the tool, only with high hardness is obviously not enough, but also has excellent comprehensive performance, including mechanical properties, physical properties and chemical properties. The mechanical properties of the tool generally include: high hardness, high toughness, high strength, high hardness (hardness); physical properties including tool: thermal conductivity, thermal expansion coefficient; chemical performance refers to the low affinity chemical tool and workpiece. In addition to consider the cost of diamond tools and PCBN cutting tool performance is excellent, the cost is very expensive.
Metal processing, the hardness of the tool is not the pursuit of the harder the better, the pursuit of hot. That is, when the temperature is still a certain degree of hardness. Because the temperature of the cutting tool in the process is constantly rising (heating), the hardness decreases with the increase of temperature. For example, high carbon steel cutting tool, the hardness at room temperature is in line with the requirements of cutting, but a heat on the soft, short service life, the old knife to change the knife, can not be sustained continuous cutting.In order to improve the efficiency of production, especially under the conditions of automated production, we must pursue the high temperature of the cutting tool, that is, in the process of cutting, although the temperature increases, but the tool is still hard, sharp, wear-resistant. The purpose is to prolong the service life of the cutter. As a result, the carbide tool on the basis of the emergence of carbide cutting tools (powder metallurgy), in recent years there have been a number of ceramic tools. With the continuous improvement of the degree of automation, metal processing of the hot pursuit of the tool is getting higher and higher.
