Selection of high speed hacksaw blade

（1） Diameter selection

The diameter of the high speed hacksaw blade is related to the size of the circular saw and the workpiece to be cut. If the diameter of high speed hacksaw blade is small, the cutting speed is relatively low; The larger the relative diameter of the high-speed hacksaw blade, the higher the requirements of the saw blade and circular saw equipment, and the higher the sawing efficiency. The outer diameter of high-speed hacksaw blade should be selected according to different circular saw machine models, and the high-speed hacksaw blade with the same diameter should be used.

（2） Thickness selection

Theoretically, we expect that the thinner the saw blade, the better. The sawing seam is actually a kind of waste. The outer diameter of the saw blade and the sawing data determine the thickness of the saw blade. If the thickness is too thin, the saw blade will simply swing and shake during operation, which will affect the cutting effect. When selecting the thickness of the saw blade, the stability of the saw blade operation and the cutting data should be considered. The required thickness of some special purpose data is also specific, which should be used according to the equipment requirements, such as slotting saw blade, etc.

（3） Selection of aperture

Aperture is a relatively simple parameter, which is mainly selected according to the requirements of equipment. At present, the standard aperture of domestic design is 32mm, and some imported equipment also has 25.4mm aperture. No matter the size of the aperture, it can be transformed by lathe or wire cutting machine. The lathe can put the cushion ring in the large aperture, and the wire cutting machine can enlarge the aperture as required by the equipment.

（4） Selection of tooth number

Generally speaking, the more teeth there are, the more cutting edges there are in unit time, and the better the cutting function is. However, if the teeth are too dense, the chip capacity between the teeth becomes smaller, which simply causes the saw blade to heat; In addition, too many teeth, when the feed rate cooperation is not appropriate, the cutting amount of each tooth is very small, which will increase the friction between the edge and the workpiece and affect the service life of the blade. If the saw teeth are too thin, the gap between the teeth will be large, the impact between the edge and the workpiece will be large, and the saw blade will jump, which will affect the service life of the blade. The reasonable number of teeth should be selected according to the sawing data.

（5） Selection of tooth shape

There are angular teeth, curved back teeth, left and right teeth (replacing chamfer), high and low teeth, and rare combination teeth. The combination tooth is a combination of two kinds of tooth shapes, and its grinding is more complex. The left and right teeth are widely used.

（6） Selection of sawtooth viewpoint

The viewpoint parameters of sawtooth are complex and professional, and the key to determine the sawing quality is to select the viewpoint parameters of sawtooth correctly. The most important viewpoint parameters are front angle and back angle. The larger the rake angle is, the better the cutting sharpness of the saw tooth is, the faster the cutting speed is, and the more labor-saving the feed is. Generally, when the raw material is soft, choose a larger rake angle, otherwise choose a smaller rake angle. The back angle is the angle between the saw tooth and the machined surface. Its function is to avoid the conflict between the saw tooth and the machined surface. The larger the back angle is, the smaller the conflict is and the smoother the cutting is. Chamfering can not be too small, it plays a role in maintaining the durability and heat dissipation of the teeth. The viewpoint of saw tooth is the orientation of saw tooth in cutting, and the viewpoint of saw tooth affects the function and effect of cutting.

The diameter, thickness, hole diameter, number of teeth, tooth shape, viewpoint and so on of high-speed hacksaw blade constitute the whole high-speed hacksaw blade, which needs reasonable selection and collocation to give full play to its function.