In order to cope with high-speed machining and save a lot of processing time and costs, tool improvement has become an important factor. Due to the higher wear resistance and hardness of tungsten carbide tools, the proportion of tungsten carbide tools in the tool market is increasing.
In order to obtain the best benefits in processing, proper surface treatment must be selected. Medium and heavy load molds must be CVD high-temperature titanium plating, supplemented by precision vacuum heat treatment to achieve acceptable deformation. This part is commonly used in cold forging die, hydraulic drawing die, tungsten carbide drawing line, suction pipe. In the application of tools, molds, and mechanical parts with medium or low load or precise requirements, PVD titanium plating at low temperature (150Â°C to 500Â°C) is appropriate.
Aluminium titanium nitride with high aluminum content can easily form aluminum oxide on the surface of the hard film. This layer of oxide film can make titanium aluminum nitride ceramic hard film oxidation temperature reached 923 degrees Celsius, can protect the high-speed carbide cutting tool edge cutting edge oxidation resistance and maintain high temperature hardness. However, although titanium nitride and titanium carbonitride also form titania oxide films at high temperatures, they are not easily adhered to the hard films and flaking off with chips, which results in the lack of protection of the hard films, rapid oxidation, and deterioration. Therefore, no matter whether the surface treatment of high-temperature or low-temperature coating has to be properly selected, a proper substrate and a stable heat treatment must be selected, supplemented by the pre-treatment of surface fine-grinding and polishing.
Ultra-high temperature resin bond diamond grinding wheel processing efficiency is lower than METROX grinding wheel, due to the high bonding strength of the grinding wheel, the production cycle is short, the processing cost is low, especially when grinding tool edge is not easy to cause chipping, and according to the use requirements, Grinding into a variety of shape and shape of the molding wheel, so it is still widely used in production for a long time. How to further improve the grinding performance of such grinding wheels has also become an important task at present.
With the rapid development of tool design, manufacturing and use technologies, and the ever-increasing output of cutting tools, ultra-high temperature resin-bonded diamond grinding wheels still cannot fully meet the requirements for high-volume production of cutting tools. There is still room for further development in the number and quality of tools. . To this end, Shanghai Zhongyu Company is further studying how to improve the grinding performance of this type of grinding wheel, in particular, a large number of experimental studies have been conducted on the wear resistance of the bonding agent, the bonding strength of the bonding agent and the diamond abrasive, and the self-sharpening properties. Great progress. The test results show that the improved wheel grinding efficiency can be increased by about 20% on the original basis, and the life of the grinding wheel can be increased by about 50%.
At present, the imbalance of tool structure is not the right way to produce tools and demand. For example, users need carbide cutting tools to have large gaps, but high-speed steel tools are over-manufactured; modern manufacturing is in urgent need of efficient tools. The gap is large, but low-grade standard tools are over-produced.
In developed countries, carbide cutting tools currently account for 70% of the tool. High-speed steel cutters are being reduced by 1% to 2% per year, and the current proportion has dropped to below 30%. The proportion of super hard tools such as diamond and cubic boron nitride is about 3%.
Ball valves are usually used for shutting off or connecting the medium flow.
The maximum permissible leakage of the valve with non-metal elastic seals is zero, and that of the Ball Valve with meal seals is 0.1xDNmm3/s.
Therefore, acceptable valves with metal seals possibly have slight leakage. Hence, in the applications where there must not be any leakage,especially at the pipeline ends, ball valves with soft seals should be used.
Nominal pressure of brass ball valve is 1.6MPa, 2.0MPa and 2.5MPa. When the ball valve is used for saturated steam, the pressure of the saturated steam should be â‰¤0.6MPa.used.
Ball Valve,Brass Ball Valve,Brass Gas Ball Valve,Mini Brass Ball Valve
Ningbo Jiekelong Precision Manufacturing Co., Ltd. , http://www.jklvalve.com