Page 319 - Demo

317CUTTING MATERIAL GRADES AND ENGINEERING MATERIALSISCAR%u2019s products for hole machining are made from cemented carbide. Cemented carbides are very hard materials and therefore they can cut most engineering materials, which are softer. In most cases, to improve performance of thread cutting products when applied to machining a specific class of materials, the indexable inserts and solid carbide tools are coated. One of the most common methods of coating is by physical vapor deposition (PVD). PVD coatings have a wide distribution in indexable thread turning inserts and thread solid carbide tools because they leave the cutting edges sharp. PVD coatings are applied at relatively low temperature (about 500%u00b0C).Nano layered PVD coating PVD coatings were introduced during the late 1980%u2019s. With the use of advanced nanotechnology, PVD coatings performed a gigantic step in overcoming complex problems that were impeding progress in the field. Developments in science and technology brought a new class of wear-resistant nano layered coatings. These coatings are a combination of layers having a thickness of up to 50 nm (nanometers) and demonstrate significant increases in the strength of the coating compared to conventional methods.