| Name | Silicon nitride Milling tool |
| Material | Silicon nitirde |
| Application | Milling |
| Color | Black |
| Product advantages： | |
| ●High hardness The room temperature hardness value of the silicon nitride ceramic blade already exceeds the hardness of the best cemented carbide blade,reach to 92.5~94HRA, which greatly improves its cutting ability and wear resistance. It can process all types of hardened steel and hardened cast iron with a hardness of up to 651HIRC, eliminating the need for electricity consumed by annealing processing. Its excellent wear resistance not only prolongs the cutting life of the tool, but also reduces the number of tool changes during processing, thereby ensuring the small taper and high precision when cutting the workpiece, especially when high-precision continuous processing is performed on a CNC machine,it can reduce tool setting erros and unpredictable error caused by wear, simplify tool error compensation. ●High strength At present, the bending strength of silicon nitride ceramic blades has reached 750~1000Mpa, which exceeds high-speed steel and is equivalent to ordinary cemented carbide. ●Good resistance to high temperature oxidation The heat resistance and high temperature oxidation resistance of silicon nitride ceramic blades are particularly good. They can maintain a certain degree of hardness and strength for long-term cutting even at high temperatures of 1200~1450C. Therefore, it is allowed to use a cutting speed much higher than that of cemented carbide tools to achieve high-speed cutting. Its cutting speed is 3~10 times higher than that of cemented carbide tools, which can greatly improve production efficiency. Experiments have proved that among many ceramic materials, Si3N4 ceramics have the best heat resistance. ●Good fracture toughness Fracture toughness value is one of the important indicators to evaluate the resistance of ceramic blades to damage, and it is related to the composition, structure, and technology of the material. The fracture toughness value of Si3N4 series ceramic inserts is better than other series ceramic inserts (up to 6~7MPam), close to some grades of cemented carbide inserts, therefore, it has good impact resistance, especially in milling, planing, boring and other intermittent cutting, it can show its superiority. ●Strong thermal shock resistance The thermal shock resistance of ceramic materials refers to an important index for evaluating their ability to resist damage when they are subjected to rapid temperature changes. The thermal shock resistance index DT of Si3N4 series ceramic blades is significantly better than other series of ceramic blades (300~400C) due to its high strength and low thermal expansion coefficient, which is as high as 600~800C. Therefore, it shows unique superior performance in the blank processing of high-strength intermittent parts. |
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| Application | |
| Application points of ceramic blades The key of ceramic tools is cutting heat, and the core of cutting parameters is heat balance. The cutting principle of ceramic tools is high temperature extrusion, that is, using high linear speed to generate enough heat in the cutting area to plasticize the chips. When turning, the principle of tool path design is to reduce the shearing force of the workpiece to the blade as much as possible, and to convert the shearing force into a pressing force. At the same time, avoid cutting from the sharp part of the workpiece to cause the occurrence of groove sandal wear. Milling can be considered as intermittent machining in turning, so its requirements are more strict than turning. For this reason, compared with the 200-300m line speed used in turning, it is recommended to use the 700-1000m/min line speed when the disc milling cutter is milling, and the end milling cutter is recommended to use the 350-1000m/min line speed to stabilize the tool working conditions. When milling ceramic end mills, the principle of tool path design is to avoid acceleration and impact as much as possible. The wear and failure analysis based on cemented carbide tools is not applicable to ceramic tools. The chipping on the knife is the result of the expansion of the number of micro-cracks in the ceramic caused by the cutting pressure. This type of tool wear usually does not cause damage to the tool performance, and in rough machining, the surface finish is not the main consideration. This kind of small peeling will produce a new sharp edge of the tool tip, and the tool can continue to work in this state. |
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