How to Select High Quality Alloy Saw Blades
Source: unknown Author: admin Release time: 2018-11-22 views
Alloy saw blade is the most commonly used tool in wood products processing. The quality of carbide saw blade is closely related to the quality of processed products. Correct and reasonable selection of cemented carbide saw blades is of great significance for improving product quality, shortening processing cycle and reducing processing costs.
The cemented carbide saw blade includes many parameters, such as the type of alloy tool head, material, diameter, number of teeth, thickness, tooth shape, angle, aperture, etc. These parameters determine the processing ability and cutting performance of the saw blade. When choosing saw blade, it is necessary to select saw blade correctly according to the type, thickness, speed, direction, feeding speed and width of saw path.
(1) Selection of cemented carbides The common types of cemented carbides are tungsten cobalt (YG) and tungsten titanium (YT). Tungsten-cobalt cemented carbides are widely used in wood processing industry because of their good impact resistance. The commonly used model in wood processing is YG8-YG15. The figure behind YG indicates the percentage of cobalt content. With the increase of cobalt content, the impact toughness and bending strength of the alloy have been improved, but the hardness and wear resistance have been reduced. It should be selected according to the actual situation.
(2) Matrix selection
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 steels have high thermal conductivity and high carbon content, but their hardness and wear resistance decrease sharply when they are subjected to temperatures ranging from 200 to 250 C. They have large heat treatment deformation, poor hardenability and easy to crack after a long tempering time. Manufacture economic materials for cutting tools such as T8A, T10A, T12A, etc.
3. Compared with carbon tool steels, alloy tool steels have better heat resistance, wear resistance and treatment performance. The heat-resistant deformation temperature is 300-400 C, which is suitable for manufacturing high-grade alloy circular saw blades.
4. High-speed tool steel has good hardenability, strong hardness and rigidity, less heat-resistant deformation, and belongs to ultra-high strength steel. Thermoplastic stability is suitable for manufacturing high-grade ultra-thin saw blades.
(3) The choice of blade diameter is related to the sawing equipment used and the thickness of the sawing workpiece. The diameter of saw blade is small, and the cutting speed is relatively low. The larger the diameter of saw blade, the higher the requirement of saw blade and sawing equipment, and the higher the sawing efficiency. The outer diameter of the saw blade is selected according to the different circular saw machine types to use the saw blade with the same diameter. The diameter 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 (18 inches), 500MM (20 inches), etc. The bottom groove saw blades of precision cutting board are mostly 120MM.
(4) Choosing the number of serrated teeth, generally speaking, the more teeth there are, the more cutting edges in a unit time, the better cutting performance. But the number of cutting teeth needs more cemented carbide, and the price of the saw blade is higher. However, if the number of serrated teeth is too dense, the volume of chips between teeth becomes smaller, it is easy to cause the heat of the saw blade. If the feed quantity is not matched properly, the cutting quantity of each tooth is very small, which will aggravate the friction between the edge and the workpiece and affect the service life of the blade. Usually the spacing of teeth is between 15 and 25 mm. The reasonable number of teeth should be selected according to the sawing material.
(5) Selection of Thickness
(6) The commonly used tooth shapes are left and right teeth (alternating teeth), flat teeth, trapezoidal flat teeth (high and low teeth), inverted trapezoidal teeth (inverted conical teeth), swallow tail teeth (hump teeth), and seldom seen industrial grade double-end cutting special three left and right, left and right flat teeth, etc.
1. Left and right teeth are widely used, cutting speed is fast and grinding is relatively simple. Suitable for cutting and cross sawing all kinds of soft and hard wood profiles and density boards, multi-layer boards, particleboard, etc. The right and left teeth equipped with anti-rebound force protective teeth are swallowtail teeth, which are suitable for longitudinal cutting of all kinds of wood with knots. The left and right teeth saw blades with negative rake angle are usually used for sawing the face plate because of their sharp teeth and good sawing quality.
2. Flat-toothed saw is rough, cutting speed is slow, and grinding is the simplest. It is mainly used for sawing common wood with low cost. It is mostly used for small diameter aluminium saw blades to reduce adhesion during cutting, or for slotting saw blades to keep flat groove bottom.
3. Ladder flat teeth are the combination of trapezoidal teeth and flat teeth. The grinding is more complex. When sawing, it can reduce the phenomenon of veneer cracking. It is suitable for sawing single and double veneer wood-based panels and fireproof panels. In order to prevent adhesion, the saw blades with more teeth of ladder flat teeth are often used for aluminium saws.
4. Inverted ladder teeth are often used in saw blades with bottom slots. When sawing double veneered wood-based panels, slot saws adjust thickness to complete bottom slotting, and then main saws to complete plate sawing, in order to prevent edge collapse of saw blades.