Hard alloy blade for improving cutting edge structure

Abstract

The invention discloses a hard alloy blade for improving a cutting edge structure, comprising at least one cutting edge formed by crossing a front knife face and a rear knife face. Hard alloys of the front knife face and the rear knife face at both sides of the cutting edge are in a gradient change structure, i.e. the transition from a homogeneous alloy region on an inner layer to a cubic carbon and nitrogen compound enrichment region and then to a binder-phase enrichment surface region, the gradient change structure mainly refers to the cubic carbon and nitrogen compound enrichment region ina confluence region at the cutting edge, and the length L1 of a cubic carbon and nitrogen compound enrichment surface region exposed at the cutting edge, which is perpendicular to the length of the front knife face, is greater than a length L2 perpendicular to the rear knife face. The hard alloy blade for improving the cutting edge structure has the advantages of high toughness, wear resistance, long service life, and the like.

Description

technical field [0001] The invention relates to a cemented carbide blade, in particular to a cemented carbide blade with improved local structure. Background technique [0002] During the machining of carbide-coated inserts, there are two failure regimes: wear and breakage. Blade wear mainly includes abrasive wear, adhesive wear, diffusion wear and oxidation wear. Under different cutting conditions, when processing workpieces of different materials, the main cause of wear may be one or two of them. Generally speaking, when the cutting temperature is low, it is mainly abrasive wear, and when the cutting temperature is high, it is mainly diffusion wear and oxidative wear. Blade damage is mainly brittle damage (chipping, chipping, peeling, crack damage, etc.) and plastic deformation. The experimental data show that the early damage of the blade is mainly caused by brittle damage caused by mechanical impact; the later fatigue damage of the blade is mainly caused by the brittl...

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Problems solved by technology

However, in the subsequent application practice, we found that the existence of the enriched binder phase surface area reduces the yield strength and hardness of the blade material, resulting in plastic deformation of the cutting edge of the blade and a decrease in the wear resistance of the flank

CN101214743A Chinese patent document discloses a coated blade for processing cast iron. The two sides of the cutting edge of the blade matrix form a bonding phase-enriched surface area, and the fan-shaped area in the middle of the bonding phase-enriched surface area is cubic phase-enriched. The structure improves the plastic deformation resistance of the cutting edge, but in high-speed and high-efficiency cutting of steel and stainless steel, the flank wear resistance performance is poor, and the plastic deformation resistance needs to be further improved.

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