How to choose the right carbide circular saw blade
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How to choose the right carbide circular saw blade
Carbide saw blades are widely used in the wood processing industry because of their high hardness, impact resistance, wear resistance, and the ability to maintain normal cutting ability at high temperatures.
Proper use of cemented carbide saw blades can reduce the number of sharpening times, improve the surface quality, and achieve the purpose of using saws instead of planing, thereby improving work efficiency and material yield.
It is often seen that the two English letters Y and G are printed on the surface of cemented carbide saw blades. They represent the commonly used types of cemented carbides: tungsten-cobalt (code YG) and tungsten-titanium (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.
How to choose a carbide circular saw blade
The actual selection of carbide circular saw blades should consider specific issues such as the type of material to be sawed, thickness, sawing speed, sawing direction, feeding speed, and sawing path width. These problems ultimately boil down to the choice of parameters such as the tooth profile and angle of the saw blade. The following is a brief introduction to the selection of the geometric parameters of the saw blade:
1. Selection of saw blade tooth type
The tooth type of the circular saw blade is divided into left and right teeth, tapered teeth, flat teeth, trapezoidal teeth, crescent teeth, etc. In actual use, the choice is mainly based on the type of raw material being sawed.
①The left and right teeth are suitable for opening and horizontal sawing of various soft and hard materials and particleboards. The left and right teeth equipped with anti-repulsion protection teeth are suitable for longitudinal cutting of various boards with tree nodes. The left and right tooth saws with negative rake angles Due to the sharp saw teeth and good cutting quality, the blade is usually used for sawing of veneer panels.
②Tapered teeth are often used in the slot saw blades of panel saws. When sawing double-faced wood-based panels, the slot saw completes the grooving of the bottom surface, and the main saw completes the sawing processing of the board to prevent the saw edge from falling apart. Ballast phenomenon.
Flat teeth are mainly used for sawing of ordinary wood. This kind of saw blade has a lower cost, but the saw blade is rougher.
③The combination of trapezoid teeth and flat teeth can also obtain higher cutting quality without slotted saw blades, and there will be no veneer cracking during sawing. It is suitable for sawing of various double veneer wood-based panels.
2. The choice of serration angle
The angle parameters of the saw tooth part are more complicated, and the correct selection of the angle parameters of the saw blade is the key to determining the quality of the sawing. The most important angle parameters are the rake angle, the rear angle and the wedge angle.
The rake angle mainly affects the force consumed by sawing wood chips. The larger the rake angle, the better the sharpness of the saw tooth cutting, the lighter the sawing, the more labor-saving the pushing. Generally, when the material to be processed is soft, choose a larger rake angle, otherwise, choose a smaller rake angle.
Common sense of selection of table saw alloy tooth circular saw blade
1. The selection basis of saw blade
Classification according to the material properties of sawing
1. Solid wood: cross-cutting and longitudinal cutting.
Cross-cutting needs to cut the fiber of the wood. The cutting surface must be flat, without knife marks, and without burrs. The outer diameter of the saw blade used should be 10 inches or 12 inches and the number of teeth should be 60 to 120 teeth. The thinner the material is used. The more the number of teeth corresponds to the machine. The feed rate should be correspondingly slow. Slitting saws have relatively fewer teeth, and the feeding speed will be faster, so the requirements for chip removal are very high, so the required saw blade outer diameter of 10 inches or 12 inches is between 24 and 40 teeth. Another example is cutting. For materials with more knots, a saw blade with dovetail teeth should be used.
2. Artificial boards: density board, particle board, plywood
When cutting, you need to fully consider the cutting force and chip removal. The number of teeth of 10 inches or 12 inches of outer diameter of the saw blade should be between 60 teeth and 96 teeth.
3. Common uses of two saw blade tooth types:
(Left and right teeth) Mainly used for cross-cutting, longitudinal cutting of solid wood, MDF, plastic, etc.
(Ladder flat tooth) is mainly used for hard double veneer wood-based panels, non-ferrous metals, etc.
The basic data of the saw blade: ①the machine spindle speed, ②the thickness and material of the workpiece to be processed, ③the outer diameter of the saw blade and the aperture (shaft diameter); these parameters can be seen on the saw blade.
Remember: the spindle speed must not exceed the maximum speed of the saw blade. This is a safety issue and must be guaranteed. (I have seen many people use saw blades for end milling, and the speed of end milling is generally higher than the maximum speed of the saw blade, which is very dangerous.
Selection basis: Calculated from the spindle rotation number and the outer diameter of the saw blade to be matched, the cutting speed: V=π×outer diameter D×rotation number N/60 (m/s), the reasonable cutting speed is generally 60-90 m/s,
Specific suggestions:
Material cutting speed
Cork 60-90 (m/sec)
Hardwood 50-70 (m/s)
Particleboard, plywood 60-80 (m/sec)
The cutting speed is too high, the vibration of the machine tool is large, the noise is loud, the stability of the saw blade is reduced, the processing quality is reduced, the cutting speed is too small, and the production efficiency is reduced. At the same feeding speed, the cutting amount per tooth increases, which affects the processing quality and the life of the saw. Because the saw blade diameter D and the spindle speed N are power functions, in practical applications, it is most economical to increase the speed reasonably and reduce the diameter of the saw blade.
The real price-quality ratio you need:
As the saying goes: “cheap is not good, good goods are not cheap”. It may be true for other commodities, but it may not be the case for cutting tools; the key is matching. Many factors on the job site: such as equipment sawing objects, quality requirements, personnel quality, etc. Carry out a comprehensive assessment, sensibly choose the best use of the material, just right, in order to save expenses, reduce costs, and participate in industry competition. This depends on the mastery of professional knowledge and understanding of similar product information.
2. Correct use:
In order for the saw blade to exert its best performance, it must be used in strict accordance with the specifications;
1. For saw blades of different specifications and purposes, the angle of the blade head and the form of the base body are different, so try to use them according to their corresponding occasions;
2. The size and shape accuracy of the main shaft and splint of the equipment have a great influence on the use effect. Check and adjust before installing the saw blade. In particular, the factors that affect the clamping force on the contact surface of the splint and the saw blade and cause the displacement and slip must be eliminated;
3. Pay attention to the working condition of the saw blade at any time, if there are abnormalities, such as vibration, noise, and the processing surface, it must be stopped in time for adjustment, and timely repaired to maintain peak profit;
4. The original angle of the sharpening saw blade should not be changed to avoid local sudden heating and cooling of the blade. It is best to ask for professional sharpening
5. Saw blades that are not used temporarily should be hung vertically to avoid long-term laying flat, and should not be piled on top of them. The blades should be protected from collisions.
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