Some little knowledge about saw blade wear
1. Phase change wear. During the high-speed cutting and friction process of the alloy saw blade, when the temperature of the substrate or material exceeds the phase change temperature, the alloy saw blade edge will wear faster, thereby losing the cutting ability. For example, high-speed steel at 500-600°, ordinary steel at 100°, alloy steel at 300-350°, and 65 manganese steel at 200° will cause matrix phase transformation.
2. The metallographic structure of the alloy is damaged by excessive temperature during welding or other factors, and the temperature of high-density ultra-fine alloy is quenched and heated during welding, or the temperature is too high, resulting in coarsening of alloy crystals, alloy cracking, and deformation of the matrix to reduce the strength of the alloy. and wear resistance.
3. The tool wear is caused by the inconsistency of the angle design with the cutting material. The different hardness and various plastic materials are not targeted to select the appropriate alloy, and the angle of each surface is not affected by the hardness of the cutting material during dry cutting, thereby reducing the service life of the tool.
4. Oxidative wear, oxidative wear is that when the alloy saw blade is at a friction temperature of 800 degrees or higher, the oxygen in the air and the cobalt, tungsten carbide, titanium carbide, etc. in the alloy oxidize and cause tool wear.
5. Process and sharpening accuracy affect wear. Alloy circular saw blades are high-precision cutting tools. Any main and sub-margins, end face cutting straight face, or radial cutting rather than on a cutting line, form each The effect of the alloy is reduced by many factors such as the cutting point or the depth.
6. Diffusion wear, diffusion is a kind of chemical wear. Diffusion wear refers to the mutual diffusion of alloy elements between the tool and the workpiece during high temperature cutting, which reduces the physical and mechanical properties of the tool material and aggravates the tool wear. Adding titanium carbide or tantalum carbide and other additives to the cemented carbide can increase the temperature of the diffusion between the alloy and the matrix, thereby improving the wear resistance and heat resistance of the tool.
7. Adhesive wear, when cutting plastic materials, the cutting and rake face workpiece and post-cutting are sticky, and the surface of the tool or the particles with low local strength are cut or the adhesive tape of the workpiece is brushed to cause the tool to wear.
8. Improper maintenance or improper operation causes wear and tear. Each cutting equipment has different cutting feed rates, and the alloy circular saw blade is also designed with various angles according to different cutting objects, and improper coordination will also reduce its effect.
9. Mechanical wear, the workpiece or cutting edge will scratch the surface of the tool with grooves of different depths and cause wear. The smaller the tool-to-workpiece hardness ratio of the workpiece or cutting edge, the easier the tool wear, so the tool must have a higher hardness.
10. Accumulation wear, tool feed speed is too fast or precision is not high, grinding wheel selection and other factors, the edge is not well ground, the impact load of the tool during the cutting process or the material toughness is poor, and the various face angles of the tool will fall off the edge. factors.