What is sharpening of carbide woodworking router bit?
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What is sharpening of carbide woodworking router bit?
At present, many wood processing factories use cemented carbide woodworking tools, and there is a phenomenon of excessively prolonging the use time without sharpening. As a result, not only the consumption of cemented carbide is accelerated, but the processing quality is also poor. The use of cemented carbide woodworking tools is the same as the use of ordinary steel woodworking tools. It needs to be sharpened in time to restore its cutting ability, otherwise the benefits will not be achieved.
Cemented carbide materials are very hard and brittle, not only difficult to ensure the quality of the cutting edge, but also extremely easy to crack and burn during sharpening. Therefore, we must pay attention to the characteristics of sharpening carbide woodworking tools.
- Choice of grinding wheel for gard alloy woodworking milling cutter
The abrasive for sharpening cemented carbide woodworking tools uses green silicon carbide or diamond abrasives. The diamond abrasive has high hardness, sharpness and heat resistance. The diamond grinding wheel composed of it has good thermal conductivity and low grinding temperature, thereby reducing the occurrence of cracking. The unique concept of diamond abrasive tools is concentration, which represents the content of diamond per cubic centimeter of the volume of the working layer of the grinding wheel. It is stipulated that the concentration of 4.4 carats (0.88 grams) of diamond per cubic centimeter is 100%. The concentration has a greater impact on the grinding effect. Considering the high cutting ability requirements for rough grinding, choose a higher concentration. For high-finish grinding, the cutting allowance is extremely small, and a large amount of abrasive is not required, and low concentration is generally used. It is advisable to use a medium concentration (that is, 75% to 100%) when used for fine grinding of woodworking knives.
- Consideration factors for carbide wood milling cutter edge grinding wheel
Considering that the cemented carbide has poor thermal conductivity, is hard and brittle, when the grinding temperature is high, the blade is prone to cracks, and the grinding stress is generated inside the blade, which causes the blade to chip. In production, softer grinding wheels (R2～R1) are often used to reduce the grinding temperature, thereby reducing the occurrence of cracks and chipping.
The tightness of the structure of the grinding wheel is very important for the cemented carbide. It should be looser than the structure of the grinding wheel when grinding high-speed steel, otherwise the grinding temperature is not easy to diverge. Generally, the structure of the grinding wheel of No. 9 to 11, if the grinding wheel is to maintain a certain shape, a tighter (about 6 to No. 7) grinding wheel structure is used.
Choose 46#～60# for general coarse grinding and 80#～100# for fine grinding.
- Grinding consumption when sharpening cemented carbide wood milling cutter
When grinding cemented carbide tools, the thickness of the metal layer and the moving speed of the worktable must also be restricted each time, otherwise the blade will be broken. When the thickness of the layer is removed each time, when the particle size is 46#～60#, it is generally not greater than 0.04mm, when the particle size is 80#～100#, it should not exceed 0.03mm. In order to avoid excessive pressure, manual feed is often used when sharpening a single knife. The moving speed of the worktable (that is, the longitudinal feed) is generally about 1 to 1.5m/min.
- Inspection after sharpening of cemented carbide woodworking router bit
After the woodworking router bit is sharpened, the rake angle, the back angle and the radial runout are mainly measured, followed by the inspection of the roughness and the tooth shape.
The roughness inspection of woodworking milling cutter is obtained by comparing with the grinding sample standard. The surface roughness of woodworking milling cutters generally requires Ra1.6～0.8μm.
The tooth shape of the woodworking milling cutter can be checked with a template that is consistent with the shape of the machined part. When checking, place the sample plate against the tooth edge in the direction perpendicular to the axis of the milling cutter, and the gap between the tooth edge shape and the sample plate should not exceed 0.1mm. In addition, pay attention to the cutting edge of the milling cutter to not allow spalling. Phenomenon such as scorching.
The above is the sharpening information of cemented carbide wood milling cutters, I hope it will be helpful to everyone!
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