（1） Selection of Hard Alloy Types
The commonly used types of hard alloys include tungsten cobalt (code YG) and tungsten titanium (code YT). Due to the good impact resistance of tungsten cobalt based hard alloys, they are more widely used in the wood processing industry.
The commonly used model in wood processing is YG8-YG15. The number behind YG indicates the percentage of cobalt content. With the increase of cobalt content, the impact toughness and Flexural strength of the alloy have improved, but the hardness and wear resistance have decreased. It should be selected according to the actual situation.
（2） Selection of matrix
1.65Mn spring steel has good elasticity and plasticity, material economy, good heat treatment hardenability, low heating temperature, and easy deformation, which can be used for saw blades with low cutting requirements.
- Carbon Tool steel has high carbon content and high thermal conductivity, but its hardness and wear resistance drop sharply when subjected to 200 ℃ -250 ℃ temperature, large heat treatment deformation, poor hardenability, and long tempering time is easy to crack. Manufacturing economic materials such as T8A, T10A, T12A, etc. for cutting tools.
- Compared with carbon Tool steel, alloy Tool steel has good heat resistance, wear resistance and treatment performance. The heat-resistant deformation temperature of 300 ℃ -400 ℃ is suitable for manufacturing high-grade alloy circular saw blades.
- High speed Tool steel has good hardenability, strong hardness and rigidity, less heat resistance and deformation, and belongs to ultra-high strength steel. Its thermoplastic stability is suitable for manufacturing high-grade ultra-thin saw blades.
（3） Selection of diameter
The diameter of the saw blade is related to the sawing equipment used and the thickness of the sawing workpiece. The diameter of the saw blade is small, and the cutting speed is relatively low; The large diameter of the saw blade requires high requirements for the saw blade and cutting equipment, as well as high cutting efficiency.
The outer diameter of the saw blade should be selected based on different circular saw machine models, and the saw blade with the same diameter should be used. The diameters of standard parts include: 110MM (4 inches), 150MM (6 inches), 180MM (7 inches), 200MM (8 inches), 230MM (9 inches), 250MM (10 inches), 300MM (12 inches), 350MM (14 inches), 400MM (16 inches), 450MM (18 inches), 500MM (20 inches), etc.
（4） Selection of number of teeth
The number of teeth in a sawtooth, generally speaking, the more teeth there are, the more cutting edges there are per unit time, and the better the cutting performance. However, a larger number of cutting teeth requires a larger amount of hard alloy, resulting in a higher price for the saw blade. However, if the sawteeth are too dense, the chip capacity between the teeth becomes smaller, which can easily cause the saw blade to heat up; In addition, there are too many serrations, and if the feed rate is not properly matched, the cutting amount per tooth is very small, which will exacerbate the friction between the edge and the workpiece and affect the service life of the blade. Usually, the tooth spacing is 15-25mm, and a reasonable number of teeth should be selected based on the material being sawn.
（5） Selection of thickness
In theory, we hope that the thickness of the saw blade is as thin as possible, and the saw gap is actually a consumption. The material of the alloy saw blade substrate and the manufacturing process of the saw blade determine the thickness of the saw blade. If the thickness is too thin, the saw blade is prone to shaking during operation, which affects the cutting effect. When selecting the thickness of the saw blade, consideration should be given to the stability of the saw blade operation and the material used for sawing. Some special purpose materials require specific thicknesses and should be used according to equipment requirements.
