1. High hardness and wear resistance
Hardness is the basic characteristic that mechanical blade materials should possess. For a mechanical blade to cut chips from a workpiece, it must be harder than the workpiece material. The cutting edge hardness of the mechanical blade used for cutting metal is generally above 60HRC. Abrasion resistance is the ability of a material to resist abrasion. In general, the harder the mechanical blade material, the better its wear resistance. The higher the hardness of the hard spots (carbides, nitrides, etc.) in the structure, the more the number, the smaller the particles, and the more uniform the distribution, the better the wear resistance. Wear resistance is also related to the chemical composition, strength, microstructure and temperature of the friction zone of the material. The wear resistance WR of the material can be expressed by the formula: WR=KICO.5E-0.8H1.43 where: 日——Material hardness (GPa) The higher the hardness, the better the wear resistance.
2. Sufficient strength and toughness
In order for the mechanical blade to work under high pressure and the shock and vibration conditions that often occur during the cutting process without chipping and breaking, the material of the mechanical blade must have sufficient strength and toughness.
3. High heat resistance (thermal stability)
Heat resistance is the main indicator to measure the cutting performance of mechanical blade materials. It refers to the performance of the mechanical blade material to maintain a certain hardness, wear resistance, strength and toughness under high temperature conditions.
The mechanical blade material should also have the ability to resist oxidation at high temperature and good anti-adhesion and anti-diffusion capabilities, that is, the material of the guard should have good chemical stability.
4. Good thermal physical properties and thermal shock resistance
The better the thermal conductivity of the mechanical blade material, the easier it is for the cutting heat to dissipate from the cutting area, which is beneficial to reduce the cutting temperature.
When the mechanical blade is intermittently cutting or using cutting fluid, it is often subject to great thermal shock (severe temperature changes), so cracks will occur inside the mechanical blade and cause fracture.
