If the correct choice of cutting parameters, tool geometry parameters and other processing conditions. PCBN（Cubic Boron Nitride）is a high efficiency and long life tool, it can create high economic benefits, but if the use of the method is not appropriate, it will cause a lot of waste.
Use attention of Cubic boron nitride tool
1. Reasonable choice of cutting parameters
Cutting speed should be selected according to the processed materials, generally much higher than the carbide tool. Because PCBN cutting hard material is used to soften the metal in the small area in the cutting zone, the cutting performance of the PCBN tool cannot be exerted when the cutting speed is too low. Feed quantity shall not be greater than 0.2mm/r, and back feed quantity shall be less than 0.3mm.
2. Reasonable selection of tool geometric parameters
Because the toughness of PCBN tool is higher than ceramic, lower than carbide, so the main consideration in the selection of tool geometric parameters is to ensure the edge strength, the tool front Angle is generally selected (0° ~ -10°), the rear Angle is selected small, about 10°. Except for special requirements, in order to ensure the strength of the tip, the tip Angle should not be less than 90°. The cutting edge should be ground to negative chamfering, generally take 0.2mm×(-15° ~ -30°), before use to use 30 ~ 50 magnifying glass to check the tool, to ensure that there is no blade breakage.
3. Cooling and lubrication
For other materials of the tool, the use of cooling lubricant is conducive to improve the processing surface and prolong the tool life. But for the PCBN tool except for the extreme special case, without cooling, fluid can also achieve the ideal processing quality and long tool life, for the PCBN tool is afraid of soft or hard. If cooling fluid is used, water-soluble cooling fluid cannot be used because CBN easily hydrolyzed at 1000℃, resulting in severe tool wear.
4. Process system of machine tool
Because the PCBN tool is mostly used for cutting hard materials such as hardened steel and wear-resistant cast iron, and the tool has negative chamfering, the radial force is relatively large. This requires the rigidity and accuracy of the is good, the system vibration should be small, the cantilever when the tool installation should be small, PCBN tool should not be used for surface processing.
Advantages of using PCBN tool
Although the price of PCBN tool material is higher than that of cemented carbide and ceramic tools, the tool cost per workpiece is lower than that of other materials. When advanced cutting technology is adopted, if the investment in grinding machine tools and other equipment is amortized into the production cost, the use of the PCBN tool will bring greater economic benefits. For the generally small and medium-sized enterprises, the grinding process of the finishing process is always the bottleneck of the manufacturing process. If the purchase of a good performance of lathes, the use of PCBN tools, the application of the car instead of grinding and other advanced cutting technology, can save equipment investment, improve productivity, but also greatly increases the flexibility of the processing process. In addition, due to the increase in personnel costs and environmental protection requirements, vigorously promote the use of PCBN tools, give full play to its potential efficiency, improve the level of cutting technology is also of great significance.
Beijing Demina is suitable for grinding cubic boron nitride tools with high quality and the machine price is competitive in the market.
