The cemented carbide saw blade contains many parameters, such as the type of the alloy cutter head, the material of the matrix, the diameter, the number of teeth, the thickness, the tooth shape, the angle, the aperture and so on. These parameters determine the machining ability and the cutting performance of the saw blade. When selecting a saw blade, the saw blade should be selected correctly according to the type, thickness, speed, direction, feed speed and width of the saw path.
Type selection of cemented carbide
The common types of cemented carbides are tungsten cobalt (code YG) and tungsten titanium (code YT). Tungsten cobalt type cemented carbide is widely used in wood processing industry due to its good impact resistance. YG8-YG15 is commonly used in wood processing. The figure after YG indicates the percentage of cobalt content. With the increase of cobalt content, the impact toughness and bending strength of the alloy are improved, but the hardness and wear resistance are decreased. It should be selected according to the actual situation.
Selection of matrix
1.65Mn spring steel has good elasticity and plasticity, economical material, good heat treatment hardenability, low heating temperature and easy deformation, which can be used for saw blades with low cutting requirements.
2. Carbon tool steel has high thermal conductivity, but its hardness and wear resistance decrease sharply when it is subjected to 200-250 C. The heat treatment deformation is large, the hardenability is poor, and the tempering time is long and easy to crack. Manufacturing economic materials for cutting tools such as T8A, T10A, T12A, etc.
3. Compared with carbon tool steel, alloy tool steel has better heat resistance, wear resistance and treatment performance. It is suitable to manufacture high-grade alloy circular saw blade at the temperature of 300-400 C.
4. High-speed tool steel has good hardenability, strong hardness and rigidity, less heat-resistant deformation, belongs to ultra-high strength steel, thermoplastic stability suitable for manufacturing high-grade ultra-thin saw blades.
The diameter of the saw blade is related to the sawing equipment and the thickness of the saw workpiece. The sawblade diameter is small, the cutting speed is relatively low; the sawblade diameter is large on the sawblade and the sawing equipment requirements are high, at the same time, the sawing efficiency is also high. The diameter of the saw blade is selected according to the type of circular saw machine. The diameters of standard parts are 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 MM (18 inches), 500MM (20 inches), etc. The bottom trench saw blades of precision cutting saw are mostly designed as 120MM.
Selection of teeth number
The number of teeth, generally speaking, the more teeth, the more cutting edges in a unit time, the better cutting performance, but the number of cutting teeth need to use more carbide, saw blade price is high, but the saw teeth are too dense, the chip volume between the teeth becomes smaller, easy to cause the saw blade heating; in addition, too much saw teeth, when the feed amount is not matched properly. If the amount of cutting per tooth is small, it will aggravate the friction between the blade and workpiece and affect the service life of the blade. In general, the spacing between teeth is 15-25mm, and the reasonable number of teeth should be selected according to the sawing material.
The thickness of the saw blade is theoretically that the thinner the saw blade is, the better the saw slot is. The material of alloy saw blade matrix and the technology of making saw blade decide the thickness of saw blade, the thickness is too thin, the saw blade is easy to shake when working, which affects the cutting effect. When selecting the thickness of the saw blade, the stability of the saw blade and the material for sawing shall be considered. Some special purpose materials require a specific thickness, should be used in accordance with equipment requirements, such as slotted saw blades, scribed saw blades.
Choice of tooth shape
Commonly used tooth shapes are left and right teeth (alternate teeth), flat teeth, trapezoidal flat teeth (high and low teeth), inverted trapezoidal teeth (inverted tapered teeth), swallow tail teeth (hump teeth), and rare industrial grade three left and one right, left and right flattened teeth. 1. about the most widely used teeth, the cutting speed is fast, grinding is relatively simple. It is suitable for all kinds of soft and hard solid wood profiles and density boards, multilayer boards, particleboard and so on. The left and right teeth with anti-rebound protection teeth are swallowtail teeth, which are suitable for longitudinal cutting of various kinds of lumber with tree knots; the saw blades with negative rake angles are usually used for sawing the panel due to their sharp teeth and good sawing quality. 2. the flat teeth saw is rough, the cutting speed is slower, and the grinding is the most simple. Mainly used for ordinary wood sawing, low cost, mostly used for small diameter aluminum saw blades to maintain cutting adhesion, or for slotting saw blades to keep the bottom of the slot flat. 3. The trapezoidal flat tooth is the combination of trapezoidal tooth and flat tooth, grinding is more complex, cutting can reduce veneer cracking phenomenon, applicable to a variety of single-double veneer wood-based panels, fire board sawing. In order to prevent adhesion, the saw blades used for aluminum are also used with many teeth. 3.Inverted ladder teeth are often used in cutting board saw blades with bottom groove. When cutting double-faced wood-based panels, the slot saw adjusts the thickness to complete the bottom groove processing, and then the main saw completes the board sawing processing to prevent the saw edge collapse. 5. Tooth shape of the following example: _, left and right tooth shape alternate teeth_, ladder flat teeth_, swallow tail teeth rebound-proof swallow tail teeth_, flat teeth, inverted ladder teeth and other tooth shape, saw solid wood, particleboard, medium density board should choose left and right teeth, can sharply cut the wood fiber tissue, smooth incision; In order to maintain the bottom of the groove; Flat groove, then use flat teeth or combination of left and right flattened teeth; sawing and pasting panels, fire-proof panels generally choose trapezoidal flattened teeth, computer cutting saw because of the sawing rate, the diameter and thickness of the alloy saw blades are relatively large, diameter of about 350-450mm, thickness of 4.0-4.8 mm, most of the use of trapezoidal flattened teeth to reduce the edge collapse. A sawing.
Sawtooth angle selection
The angle parameters of sawtooth section are complex and most professional, and the correct choice of the angle parameters of sawtooth blade determines the sawing quality.