Manufacturing Technology of Super Hard Tool
Super hard tool is a cutting and forming tool whose hardness is higher than ordinary tool materials. It is mainly used for processing difficult-to-machine materials, such as high-hardness, high-wear-resistant, non-ferrous and ferrous metals, and machining soft, tough and non-metal materials with greater hardness and wear resistance, such as ceramics, optical glass and quartz. Super hard tool has the characteristics of high hardness, high strength and wear resistance, as well as good thermal and chemical stability, and high thermal conductivity. It is widely used in the machining of automobile, engineering machinery, electrical and electronic, aerospace, motor and other parts.
The manufacture of super hard tools mainly includes super abrasive machining methods and WC machining methods.
Super abrasive machining method is a recently developed machining technology. It has the characteristics of good surface quality, high precision and low cost. This method uses diamond (CVD or HPHT) or cubic boron nitride (CBN) as cutting tools. The tool material is first heated, infiltrated into the metal matrix, and is then bonded with the matrix. This method is suitable for the machining of parts with large size and complex shape.
WC machining method is an traditional machining method, which is mainly used for the precision machining of workpieces with small size and shape. This method uses WC-based metal tool material as the tool, the tool material is sintered and then the shape of the tool is machined. The cutting tool mainly relies on the high wear resistance and high temperature strength of tungsten carbide and its metal matrix, so it has the advantages of high hardness and wear resistance, good thermal shock resistance and good cutting performance of tungsten carbide. The disadvantage is that the sintering temperature of the WC is high and its cost is high.
To ensure the quality of super hard tools, we must strictly control various control points during manufacturing and inspection. During manufacturing, it is necessary to strictly control the mixing proportion of materials, the temperature of sintering, the speed of cooling and other process parameters, so as to ensure that parts with good quality and performance can be processed. The critical quality control points during inspection include hardness testing, tightness testing, microstructure testing, dimensional accuracy testing and geometric accuracy testing.
In the manufacturing process of super hard tools, due to the continuous improvement of machining technology, the production efficiency is also increasing. It is believed that with the continuous improvement of manufacturing technology and process, super hard tools will conform to the needs of modern industrial production.
