Polycrystalline diamond tool manufacturing technology

Welding
PCD composite sheet and the cutter body in addition to the combination of mechanical clamping means and the bonding method, most of the way through the brazing composite sheet PCD suppressed in the cemented carbide substrate. Welding methods include laser welding, vacuum diffusion welding, vacuum brazing, high frequency induction brazing. Currently, less investment, low cost high frequency induction heating brazed PCD inserts are widely used in welding. The blade welding process, the welding temperature, the choice of flux and solder alloy weld will  cubic boron nitride  the performance of the tool. In the welding process, the welding temperature control is very important, such as welding temperature is too low, the welding strength is insufficient; such as welding temperature, PCD easily graphitized, and may lead to "over-burning" effect PCD and cemented  synthetic diamond  sheet substrate binding. In the actual processing, according to the holding time and the degree of difficulty PCD red to control the welding temperature (generally be less than 700 ℃). Use more foreign high-frequency welding automatic welding process, welding, high efficiency, good quality, enabling continuous production; country is to use more manual welding, production efficiency is low, the quality is not ideal.
Grinding process
PCD so high hardness material removal rate is very low (or even only one ten thousandth of carbide removal). Currently, PCD tool sharpening process is mainly made ​​of resin bonded  wheel. Between the grinding wheel and the grinding of PCD are two hardness  Abrasive grinding wheel between the materials, so its relatively complicated grinding law. For high granularity, low speed grinding wheel, a water-soluble coolant to improve grinding efficiency and the PCD grinding accuracy. Grinding binder type should be selected as the grinding and processing conditions. Since discharge grinding (EDG) technology is almost free from hardness of workpiece to be ground, so using EDG grinding PCD technology has great advantages. Some complex shapes PCD tools (such as woodworking tools) are also on this flexible grinding grinding process has a huge demand. As technology continues to evolve EDG, EDG PCD grinding technology will become one of the main development direction.