Coating blade for processing cast iron

Abstract

The invention discloses a coated tip used to processing cast iron, which comprises a hard alloy basal body and a coating. The invention is characterized in that the hard alloy basal body comprises 2 percent to 12 percent of cobalt by weight and 0.2 percent to 3.5 percent of cubic-structure compound of metallic elements from the families of IVb, Vb and / or VIb in the periodic table by weight. A binding phase surface enrichment area is formed on both sides of the cutting edge of the basal body. The middle pie-slice section of the binding phase surface enrichment area is a cubic structure enrichment area. The coating comprises an innermost layer of equiaxed grain TiCxNyOz, a middle layer of columnar crystal TiCxNy 2 microns to 13 microns thick, a transition layer of TiCxNyOz and an outer layer of fine crystal Alpha-Al2O3 4 microns to 12 microns thick. The tip disclosed by the invention not only has the characteristics of high wearing feature, high strength and high versatility, but also integrates the toughness and the plastic deformation resistance well. Accordingly, the invention is in particular applicable for processing cast iron.

Description

technical field

[0001] The invention relates to a coated blade, in particular to a coated blade for processing cast iron. Background technique

[0002] Currently, during the machining of carbide-coated tools, there are two failure regimes: wear and breakage. Tool wear mainly includes abrasive wear, adhesive wear, diffusion wear and oxidation wear. Under different cutting conditions, when processing workpieces of different materials, the main reason for the wear may be one or two of them. Diffusion wear and oxidation wear are the main types. Tool damage is mainly plastic deformation damage and brittle damage (chipping, chipping, peeling, crack damage). Cemented carbide tools have high hardness and high brittleness. They are powder sintered bodies. The structure may be uneven and have defects. When it has the nature of intermittent cutting, it is prone to brittle fracture by mechanical and thermal shock. The test shows that the early damage of the tool is less affected by...

Images