How to choose tooth blade?
In many industries production and processing can not be separated from the tooth-shaped blade, so a good blade can make the production more efficient and stable. So how to judge the good and bad of the blade? Jialong tools for you to answer.
1, the blade should have a high degree of hardness. Blade in the production process according to the processing of different products, the hardness of the blade will be different, the higher the hardness of the processing material, the higher the hardness of the blade itself must also be higher than the hardness of the processing object. In general, the higher the hardness of the insert, the better its wear resistance. The higher the hardness of the material (carbide, nitride, etc.), the greater the number, the smaller the particles, 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 of the material can be expressed by the formula WR: WR=KICO.5E-0.8H1.43 in the formula: day one by one the hardness of the material (GPa) e the higher the hardness, the better the wear resistance. (But also note that the higher the hardness, the higher the strength of the blade, the side effect is that the blade structure will become brittle, inadvertent operation will make the blade fracture). Generally speaking is not the operation is not careless, is not broken)
2: The blade should have enough toughness. Only higher hardness, the production process if a little careless, careless operation will cause the blade to pop off, so the blade must also have sufficient toughness. Good toughness of the blade in the processing process even if subjected to greater impact and pressure or vibration, the blade will not be chipped or fractured. So the blade must have enough toughness.
3: Good thermophysical properties and thermal shock resistance. The better the thermal conductivity of the cutting blade material, the worse the thermal conductivity, the cutting knife will be uneven in the process of heat transfer and the internal structure of the blade cracks, which will make the blade pop out. The thermal shock resistance of the cutting blade material can be expressed by the thermal shock coefficient value, R is defined as. R = into ab (1-u) / Ea formula: into a is a one-to-one thermal conductivity; ab is a one-to-one tensile strength;; E is a one-to-one modulus of elasticity; a is a one-to-one coefficient of thermal expansion. The coefficient of thermal expansion is small, which can reduce thermal deformation; the modulus of elasticity is small, which can reduce the size of the alternating stress generated by thermal deformation; it is conducive to improving the thermal shock performance of the material.
4,A reasonable processing technology. To maximize the performance of the blade, then the blade from the selection of materials, rough machining, heat treatment, plasticity, finishing and other details of each step is very important.