PCD tool manufacturing process
Apr 07, 2020

With the rapid development of modern science and technology, tools made of superhard materials such aspolycrystalline diamond (PCD) and polycrystalline cubic boron nitride (PCBN) are becoming more and more abundant, and their performance has also been continuously developed and improved. The abrasive grain size of the blade is from tens of microns to several microns to nanometers; the content of diamond and cubic boron nitride is divided into low content, medium content and high content;

The bonding agent has both metal, non-metal and mixed materials; the thickness of the PCD layer ranges from Millimeter level to micron level; the combination of PCD layer and cemented carbide substrate has flat surface and corrugated surface; PCD layer has different characteristics such as high wear resistance, high toughness and high heat resistance. At present, the application range of PCD and PCBN tools has been expanded to industries such as automotive, aerospace, precision machinery, home appliances, wood, electrical and electronic, etc., used to make turning tools, boring tools, milling cutters and drill bits, reamers, countersinks, saw blades, Carving knife, razor, etc.

Despite the rapid development of PCD and PCBN tools, the difficulty of tool sharpening due to their high hardness has always plagued most users, and the re-grinding of blades is mainly done by original tool manufacturers. Not only is the tool price high and the delivery time is long, but it also occupies the company's working capital. Therefore, it is necessary to seriously study the grinding characteristics of PCD and the sharpening technology of PCD tools.

PCD tool manufacturing process

The production process of PCD cutting tools generally includes polishing, cutting, fixing, sharpening, quality inspection and so on. The rough diameter of PCD superhard material is usually 1/2, 1, 2, 3, 4 inches, the surface is generally rough (Ra2 ~ 10μm), can not be used directly to make tools, it needs to be polished to achieve a mirror surface (Ra≤0.01μm), and then processed into blades with certain geometric shapes and sizes by laser cutting or wire electric discharge cutting, and then further mechanically and chemically treated the surfaces of the blades and the substrate to be fixed, and then silver-based brazing the blades It is fixed on the substrate and finally sharpened by a diamond wheel.

One of the keys to PCD cutting tool manufacturing technology is the quality of the cutting edge. The lack of ideal sharpening technology and technology for high-quality cutter head materials will result in waste of resources. The use of good sharpening technology will improve the product quality of the tool and reduce the cost of tool use.

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