precision machining|What is carbide precision machining?
01 Jan

precision machining|What is carbide precision machining?

We all know that cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. The alloy composed of one or more of the carbides and the bond metal drill is often called cemented carbide. With the advancement of science and technology and the development of production, many cemented carbide workpieces need to be precision processed, and there are relatively high requirements for tolerance dimensions and surface roughness. Precision parts processing plants are inseparable from cemented carbide. .
Cutting is a kind of precision machining of cemented carbide. Cutting is one of the commonly used methods for cutting hard alloy bars, plates, and wires. For grooving or cutting under 1mm, ultra-thin diamond cutting blades are commonly used for processing.
Diamond resin matrix cutting blade, in which the outer ring belt is a resin bond abrasive working layer, and the center part is made of high-strength and high-rigidity metal material, which is mostly used for grooving and cutting of medium and large depths of cut.
Turning is the most common processing method for precision machining of cemented carbide. In the process of turning cemented carbide parts, the hardness of the tool itself must be higher than the hardness of the workpiece to be processed. Therefore, the current tool materials for turning carbide parts are mainly high-hardness, high-heat-resistant non-metallic binders CBN and PCD. .
(1) For cemented carbide parts with hardness less than HRA90, choose BNK30 material CBN tool for large margin turning, and the tool will not chip or burn. For hard alloy parts with hardness greater than HRA90, generally choose CDW025 material PCD tool or resin bond diamond grinding wheel for grinding.
(2) When machining grooves above R3 for precision parts of cemented carbide, for those with large machining allowance, generally use BNK30 material CBN tool for roughing first, and then use a grinding wheel for grinding. For small machining allowances, you can directly use a grinding wheel for grinding, or use PCD tools for profiling.
(3) The diamond carving and milling cutter of CDW025 material (also known as flying cutter, rotary milling cutter) is used when processing the crescent grooves of cemented carbide rolls.