A shank milling cutter made of diamond, having a diameter of about 300 μm, has also been commercialized. The milling cutter is constructed as a universal straight-groove single-tooth milling cutter or as an end-blade engraving knives. It is particularly suitable for processing separators that are only a few microns thick. The disadvantage of such a slot milling cutter is that the minimum groove width depends on the diameter of the tool and the accuracy of the clamping. Previous page next page Synchronizer Ring,Transmission Synchro Rings,Gear Ring,High Speed Synchronize Ring ShaoXing Change Auto Synchronizer Ring Co.,Ltd , https://www.sxcjautoparts.com
Steel is the object of future fine cutting technology processing
Micro-cutting technology has so far been limited to processing silicon or non-metallic materials, and various synthetic materials have been processed by forming processes (including hard and brittle and soft and tough), so the next step in steel processing is very necessary. The research on fine cutting of steel began in Germany in the 1990s and is still in the research stage. Its main application field is in the tool and die industry. The wear resistance of the mold is an important prerequisite for the economics of forming processing. Especially when the structure of the mold has a high depth-to-width ratio, the bending strength of the material has reliability to the forming process. The decisive meaning is sometimes even related to whether it can be shaped.
The fine cutting of steel cannot use diamond tools, mainly carbide milling cutters. Cemented carbide is a sintered body composed of many grains, and the size of the grains determines the microscopic sharpness of the blade. Therefore, the surface quality obtained by using a diamond cutter cannot be processed, but since it is low in price and can process steel, it is still the main tool for finely cutting steel.
In order to have a sharp blade, a tungsten-cobalt-based ultrafine-grained carbide is usually used. The ultrafine particle cemented carbide tool has a grain size of 0.5 to 1.0 μm and a radius of a cutting edge of a few micrometers.
In order to develop the micro-machining technology of steel, the Institute of Machine Tool and Manufacturing Technology of the University of Carusle in Germany first tested the carbide disc milling cutter with a tool width of 0.15 mm. Using a milling cutter for cross-cutting, a quenched and tempered steel with a workpiece hardness of 52HRC, a row of 1mm high and 0.2×0.2mm2 cross-section is processed as a prism of synthetic material or powder injection material mold.
Carbide shank milling cutters for fine cutting are widely used in the industry, coated and uncoated, with a minimum diameter of 0.1 mm. Individual tool manufacturers can produce milling cutters with a diameter of 50 μm.
In order to avoid accidental breakage and premature wear of the tool, when processing hard materials such as steel, pay attention to the safety of the machining process and the smoothness of the machine tool, so the machine tool must have sufficient rigidity and dynamic performance, adopt high cutting speed and medium. Feed per tooth to ensure the cutting of the tool.
There are some difficulties in the manufacture of carbide micro-milling cutters. In addition to machining sharp edges on uneven tool materials, grinding cutters with a diameter of a few millimeters are required to be ground. The role of the cutting force, in order to solve this problem, can choose a processing method that does not produce cutting force (such as laser processing). Milling can be used to machine complex shapes. It can also be used to machine parts made of tool steel below 100μm. For example, a miniature car (1:160) wheel mold is directly milled on a mold steel with a hardness of 55HRC. The surface roughness reaches RZ=0.5μm, the formed surface has a mirror finish, and the parts after injection molding need not be further processed. Grinding is specifically designed for the processing of hard and brittle materials, allowing micro-components to be made of glass, ceramic, silicon or hard alloy. Grinding wheels of a few tenths of a millimeter wide currently used for wafer cutting have been commercialized, usually using nickel or chrome diamond abrasives as the material of the grinding wheel, and recently a CVD coated diamond shaped carbide grinding wheel has been developed. Similar to the tool, the grinding wheel also has a disc-shaped grinding wheel for forming a grinding wheel and a versatile finger-shaped grinding wheel which can process a fine arbitrary shape surface. The minimum diameter of the finger grinding wheel currently used in the research department is 50 μm.