Vitrified bond diamond grinding wheels are the best choice for grinding PDC materials. But if the vitrified bond diamond wheels are not of good quality, they will not achieve good grinding results.
Introduction of PDC Materials
Polycrystalline diamond composite (PDC) refers to the superhard composite material composed of the diamond layer of 0.1 mm to several mm thick and the tungsten carbide substrate at high temperature (5-7 GPA, 1400 ° C – 1700 ° C). PDC features high hardness, high wear resistance, and high thermal conductivity. It has become the ideal material for high-grade machining tools, geological oil drill bits, ceramic abrasive tools, stone tools, concrete tools and other high wear-resistant equipment. It has become one of the most important pillars in the field of high-tech new materials.
PDC is mainly used in the field of precision machining, and the requirements of its dimensional tolerance are very strict. Therefore, how to effectively handle PDC has always been a big problem. At present, most PDC grinding manufacturers use the diamond grinding wheel for cylindrical grinding PDC to meet the requirement of dimensional tolerance. The processing efficiency and processing precision of the resin bond diamond grinding wheel are much lower than that of the vitrified bond diamond grinding wheel.
So, the vitrified bond diamond grinding wheel is used for PDC grinding. In order to meet the growing demand of vitrified bond diamond grinding wheels in the cylindrical grinding market, New Zuan Diamond Tools Co., Ltd. has studied the vitrified bond diamond grinding wheel for cylindrical grinding. The preparation and application technology of vitrified bond diamond grinding wheel for PDC has been greatly improved through the cooperation with customers.
The hardness of the superhard grinding wheel means that the superhard abrasive is difficult to fall off from the grinding wheel. The harder it is to fall off, the higher the hardness of the grinding wheel.
In general, the larger the amount of bonding agent, the stronger the holding force of the abrasive. It increases the grinding life, but it creates a gap on the surface of PDC. The hardness of PDC itself is very high.
The diamond on the surface of the grinding wheel is subjected to large grinding force and impact force during the cylindrical grinding process. It the amount of vitrified bond is too small, the holding force of vitrified bond to the diamond will be not enough. If it is not fully exerted, the diamond will fall off. The service life will also be shorter. If the bonding is too much, the hardness of the grinding wheel is too larger and the sharpness is insufficient, which may cause a gap on the PCD.
The control of the firing temperature of the vitrified bond directly affects the grinding wheel performance, and mainly related to the superabrasive performance and the vitrified bond itself. In the production of vitrified bond tool products, it is found that in the sintering range, as the sintering temperature of the grinding wheel increases, the strength of the grinding wheel also increases accordingly. The concentration of superabrasive is the superabrasive content per unit volume in the superabrasive layer. The higher the concentration, the longer the life is.
As the diamond concentration increases, the life of the grinding wheel increases. For PDC cylindrical grinding, the diamond abrasive grains involved in grinding increase in the high concentration vitrified bond diamond grinding wheel. Therefore, choose the vitrified bond diamond grinding wheel with excellent quality for PDC.