The cutting parameters and risks of using the cubic boron nitride tool to grind the car. Using the cubic boron nitride tool to cut the cutting parameters of the car by the grinding process, the cutting parameters of the hardened steel are mainly based on the material of the tool material and the workpiece material. Mechanical properties, workpiece shape, process system rigidity and machining allowance are chosen. When selecting the three elements of cutting amount, first consider the selection of a reasonable cutting speed, followed by the cutting depth, followed by the feed. The cubic boron nitride tool (CBN) not only has a high metal removal rate, but also has a good surface finish quality. Cutting various hardened steels can effectively replace grinding, reduce machining processes and increase productivity. Most of the CBN blades sold on the market are made into indexable inserts or knives in the form of solid carbide composite sheets. At present, Valin Superhard Materials Co., Ltd. is the first to develop integrated CBN inserts, increasing the application of CBN inserts. The field has been widely used in roughing and intermittent processing. Due to the high hardness (HV8000～9000) and high heat resistance (1400°C～1500°C), the CBN tool can cut hardened steel at a cutting speed several times higher than that of hard alloy, and the durability is hardness alloy. Several times to dozens of times. When cutting a material with a hardness of HRC 55-65, the cutting speed of the cubic boron nitride tool should be 50-120 m/min. Vc=100～160m/min during milling, Vf=70～160mm/min per minute; Vc=60～130m/min when reaming, ap=0.1～0.2mm, f=0.07～0.2mm/r . It is necessary to pay attention to the hardened steel with cubic boron nitride tool. The hardness of the workpiece is higher than 45HRC, and the effect is the best. The higher the hardness of the workpiece, the lower the cutting line speed. For example, the workpiece with a hardness of 70HRC should have a cutting speed. 60-80m/min is selected; when the cutting depth of the finishing car is 0.1-0.3mm, the feeding amount is 0.05-0.025mm/r, and the surface roughness of the workpiece after finishing the car is Ra0.3-0.6μm, the dimensional accuracy can reach 0.013mm. If it can be processed by standard CNC lathe with good rigidity, the rigidity of the tool is good and the edge is sharp. The surface roughness of the workpiece after finishing the car can reach Ra0.3μm, the dimensional accuracy can reach 0.01mm, and it can reach the level of machining with CNC grinding machine. . 2, compared with the grinding and grinding process cost and risk compared with grinding, the use of cubic boron nitride tools to achieve better processing efficiency than grinding. In hard turning, Valin BN-S10 cubic boron nitride cutters can be cut with large depth of cut and high workpiece speed. The metal removal rate is usually 3-4 times of grinding, and the power and labor consumed. The material consumables are only 1/5 of the grinding. Risk factors: The machine tool clearance and rigidity used in hard cars determine the probability of the knife and the knife problem, and also affect the dimensional accuracy and surface roughness of the machined workpiece. Therefore, users need to consult and select according to their own workpiece requirements. Valin Superhard CBN Tool Development Department Related Article: CBN Tool Resilience
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