Superhard material tools currently mainly include single crystal diamond tools, polycrystalline diamond (PCD) tools, chemical vapor deposition (CVD) diamond tools, and polycrystalline cubic boron nitride (PCBN) tools. It is not only the ideal tool for processing high-hardness materials, but also replaces ordinary cutters with super-hard material tools for cutting, which can realize high-speed and high-efficiency machining of cast and forged blanks and/or finish roughing and finishing in one time. Superhard material tools are perfectly suited for high speed, precision and automated machining. Especially in the case of car grinding, milling and grinding, it is suitable for precision grinding of forming, profiling and sizing, and the grinding quality is significantly improved, and the grinding efficiency is increased several times or even dozens of times. It not only prevents defects such as surface burns, micro-cracks, gaps, and excessively deteriorated layers, but also improves work efficiency, reduces consumption and grinding costs. It has the advantages of high efficiency, low consumption, strong adaptability and short manufacturing cycle. At present, it has been widely used in the machining of automobiles, motorcycles, aviation, mining, electronics, glass and other industries. 1. Application in machining 1.1 Application in turning machining 1.1.1 Turning steel parts When machining hardened steel, superhard material tools can be worn by car. Since the depth of cutting is ten times higher than grinding, the efficiency can be increased by more than 4 times, and the processing cost is reduced to 1/5. The hardened steel with a PCBN tool with a hardness higher than 45HRC has the best effect, and the cutting speed is generally 80-120m/min. The cutting speed of high hardness workpieces should be low, such as workpieces with a hardness of 70HRC, and the cutting speed should be 60~80m/min. The cutting depth of the finishing car is 0.1-0.3mm, the feeding amount is 0.05-0.025mm/r, the surface roughness of the processing is Ra0.3-0.6μm, and the dimensional accuracy is 0.013mm. If a rigid CNC lathe is used and the rigidity of the PCBN tool is good and the cutting edge is sharp, the surface roughness of the finished car can reach Ra0.3μm and the dimensional accuracy is 0.01mm, which can reach the level of CNC grinding machine processing. A factory originally used the grinding process to process pinion gears, which can only process 100 pieces in one class; now it uses PCBN tool turning, the cutting parameters are: v=60～120mm/min, f≤0.12mm/r, ap≤0.1mm, one The class can process 400 pinions. In addition, the processing costs allocated to each gear have also decreased. For example, using PCBN tool to process carburized and quenched 20CrMnTi automotive gearbox synchronizer fork (HRC58～62), cutting speed V=150mm/min, feed ƒ=0.1mm/r, ap=0.2～0.3mm, cutter The cutting stroke reached 9.58km. After the car is milled, the efficiency is increased by more than 4 times, and the processing cost is reduced to 1/3 to 1/2 of the original grinding process. Hembrug of the Netherlands uses PCBN tools for hardening EN21 bearing steel (HRC62) on the MikroturnCNC series of super-precision lathes, and Y.KevinChou and ChrisJ.Evans of the National Institute of Standards and Technology to process AISIM50 steel (HRC62-64) with SumitomoBN series PCBN tools. MAFleming of DeBeers Industrial Diamond Company of the United Kingdom realized the nano-cutting by using AMBORITEDBN45 tool to turn EN31 bearing steel on the DeltaTurn40 lathe. Examples of ultra-hard material tool processing steel parts are the use of the CK7820 CNC lathe of the Great Wall Machine Tool Plant to process the two-axis 20CrMnTiHA3 multi-speed spline undercut groove (HRc58-63) in the heavy-duty vehicle transmission, and the processing of mining machinery using the 1A616 machine tool. No. Φ48h6 drive shaft (HRc42～45), precision turning GCr15 hardened bearing steel workpieces (30HRc, 40HRc, 50HRc, 60HRc and 64HRc) on the CA6140 lathe with stepless speed change. The specially ground PCBN tool is used on an ultra-precision lathe. The cutting surface finish can reach Rmax=0.0254μm under the conditions of cutting depth of 15~20μm and feed rate of 0.608μm/r. Cutting stainless steel on a general precision CNC lathe can achieve surface roughness within Rmax = 0.2 μm. Gate Valves are called "full-flow" valves; there's a direct unobstructed path for flow right through the middle of the valve. A wedge-shaped brass gate is lowered into a machined slot to close the valve. They should either be completely open or completely closed. Water flowing through a partially open gate valve wears away the metal and causes the valve to fail over time. Brass Gate Valve, Flanged Gate Valve, High Pressure Gate Valves, Water Gate Valves ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsir-valve.com Previous page 1 2 3 4 Next page