1, high hardness and wear resistance The hardness […]
1, high hardness and wear resistance
The hardness is the basic characteristic that the mechanical blade material should have. The mechanical blade must cut the chip from the workpiece, its hardness must be greater than the hardness of the workpiece material. Cutting metal used in the cutting edge of the mechanical blade hardness, generally above 60HRC. Wear resistance is the ability of materials to resist wear and tear. In general, the higher the hardness of the mechanical blade material, the better the wear resistance. The higher the hardness (carbide, nitride, etc.) in the organization, the higher the number, the smaller the particles, the more uniform distribution, the better the wear resistance. The abrasion resistance is also related to the chemical composition, strength, microstructure and temperature of the material. Can be used to represent the wear resistance of the material WR: WR = KICO.5E-0.8H1.43 where: day one material hardness (GPa) e hardness is higher, the better the wear resistance.
2, sufficient strength and toughness
The mechanical blade material must have sufficient strength and toughness to make the mechanical blade work under great pressure and under the conditions of shock and vibration that often occur during the cutting process without creating chipping and breaking.
3, high heat resistance (thermal stability)
Heat resistance is a measure of the mechanical blade cutting performance of the main signs. It refers to the mechanical blade material in high temperature conditions to maintain a certain degree of hardness, wear resistance, strength and toughness of the performance.
The mechanical blade material should also have the ability to resist oxidation at high temperatures and the ability to resist anti-sticking and anti-diffusion, that is, the material 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 to cut away from the cutting zone, which is conducive to reducing the cutting temperature.
Mechanical blades are often subject to great thermal shock (severe temperature changes) when intermittent cutting or cutting fluids are used, resulting in cracks in the interior of the mechanical blade.
Thermal expansion coefficient is small, can reduce the heat distortion; elastic modulus is small, can reduce the heat distortion caused by the magnitude of the alternating stress; is conducive to the material resistance to the resistance of the material. Increased thermal shock performance. Good thermal impact resistance of the mechanical blade material, in the cutting process can use cutting fluid.
5, good process performance
In order to facilitate the manufacture of mechanical blades, mechanical blade material is required to have good process performance, such as forging performance, heat treatment performance, high temperature plastic deformation performance, grinding performance.
Economy is one of the important indicators of mechanical blade material, high-quality mechanical blade material Although the cost of single-piece mechanical blade is high, but because of its long service life, the cost of each component is not necessarily high. So the choice of mechanical blade material to consider its economic results.