Cemented carbide saw blades include various parameters such as the type of alloy blade, the material of the substrate, the diameter, the number of teeth, the thickness, the tooth profile, the angle, and the aperture. These parameters determine the processing capacity and cutting performance of the saw blade. When choosing a saw blade, the saw blade should be selected correctly according to the type of sawing material, the thickness, the speed of sawing, the direction of sawing, the feeding speed, and the width of the saw road.
(1) The choice of the type of cemented carbide The commonly used types of cemented carbide are tungsten-cobalt type (code YG), tungsten-titanium type (code YT). Because tungsten-cobalt-based cemented carbide has better impact resistance, it is more widely used in the wood processing industry. The commonly used model in wood processing is YG8-YG15. The number after YG indicates the percentage of cobalt content. As the cobalt content increases, the impact toughness and bending strength of the alloy will increase, but the hardness and wear resistance will decrease. Choose according to the actual situation.
(Two) the choice of substrate
⒈65Mn spring steel has good elasticity and plasticity, economical material, good heat treatment hardenability, low heating temperature, easy deformation, and can be used for saw blades that require low cutting requirements.
⒉ Carbon tool steel has high carbon content and high thermal conductivity, but its hardness and wear resistance drop sharply when exposed to temperatures of 200℃-250℃, heat treatment deformation is large, hardenability is poor, and long tempering time is easy to crack. Manufacture economical materials for tools such as T8A, T10A, T12A, etc.
⒊ Compared with carbon tool steel, alloy tool steel has better heat resistance, wear resistance and better handling performance. The heat deformation temperature is 300℃-400℃, which is suitable for manufacturing high-grade alloy circular saw blades.
⒋ High-speed tool steel has good hardenability, strong hardness and rigidity, and less heat deformation. It belongs to ultra-high strength steel, and its thermoplasticity is stable. It 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 has higher requirements for the saw blade and sawing equipment, and the sawing efficiency is also high. The outer diameter of the saw blade is selected according to the different circular saw machine models to use the saw blade with the same diameter. The diameters of standard parts are: 110MM (4 inches), 150MM (6 inches), 180MM (7 inches), 200MM (8 inches), 230MM (9 inches), 20MM (10 inches), 300MM (12 inches), 350MM ( 14-inch), 400MM (16-inch), 450MM (18-inch), 500MM (20-inch), etc., the bottom groove saw blades of precision panel saws are mostly designed to be 120MM.
(4) Selection of the number of teeth The number of teeth of the saw tooth, generally speaking, the more the number of teeth, the more cutting edges can be cut per unit time, the better the cutting performance, but the more cutting teeth require more cemented carbide, and the price of the saw blade High, but the saw teeth are too dense, and the amount of chip between the teeth becomes small, which is easy to cause the saw blade to heat up; in addition, there are too many saw teeth. , Affect the service life of the blade. Usually the tooth spacing is 15-25mm, and a reasonable number of teeth should be selected according to the material to be sawed.
(5) The choice of thickness The thickness of the saw blade theoretically we hope that the thinner the saw blade is, the better, the sawing is actually a consumption. The material of the alloy saw blade base and the process of manufacturing the saw blade determine the thickness of the saw blade. If the thickness is too thin, the saw blade is easy to shake when working, which affects the cutting effect. When choosing the thickness of the saw blade, the stability of the saw blade and the material to be cut should be considered. Some special-purpose materials require specific thickness and should be used according to equipment requirements, such as slotting saw blades, scoring saw blades, etc.
(6) Tooth shape selection The commonly used tooth shapes include left and right teeth (alternating teeth), flat teeth, trapezoidal flat teeth (high and low teeth), inverted trapezoid teeth (inverted cone teeth), dovetail teeth (hump teeth), and The most common industrial grade three left and one right, left and right flat teeth, etc.