CUTTING TOOL TO COAT PVD FOR PROCESSING FIELD TO REQUIRE HIGH ACCURACY

摘要

PURPOSE: A PVD(Physical Vapor Deposition) to coat cutting tool is provided to process for a long time by obtaining the high shape accuracy and the fine finished face. CONSTITUTION: A cutting tool is coated on a base material(1) in a coating layer(2) with a PVD method. The base material is a superhard alloy or a summit. The surface roughness is under 0.3micrometers. The average diameter of a hardened particle in the base material is from 0.3micrometers to 1.5micrometers. A cutting blade is a sharp edge of a positive shape. The coating layer has an inner layer(2b) and an outer layer(2a). The thickness total of the inner layer and the outer layer is under 2.0micrometers. The inner layer comprises at lease one kinds to be selected from a group of a 4a group, a 5a group a 6a group, Al and Si and at least one kinds to be selected from a group of a carbon, a nitrogen and an oxygen. The outer layer comprises at least one kinds to be selected from a group of a boron, a silicon, the carbon and the nitrogen and a Ti.