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The tool can be divided into five categories according to the form of the workpiece surface. Tools for machining various external surfaces, including turning tools, planing knives, milling cutters, outer surface broaches and boring tools, etc.; hole machining tools, including drills, reaming drills, boring tools, reamers and internal surface broaches; thread processing Tools, including Taps, dies, automatic opening and closing thread cutting heads, thread turning tools and thread milling cutters; gear processing tools, including hobs, shaper knives, shaving cutters, bevel gear machining tools, etc.; cutting tools, including inlays Tooth circular saw blades, band saws, hacksaws, cutting tools and saw blade milling cutters, etc. In addition, there are combination tools. According to the cutting motion mode and the corresponding blade shape, the tools can be divided into three categories. General-purpose tools such as turning tools, planing knives, milling cutters (excluding formed turning tools, forming planers and forming cutters), boring tools, drill bits, reaming drills, reamers and saws; forming tools, cutting edges for such tools Having the same or nearly the same shape as the workpiece to be machined, such as forming turning tools, forming planers, forming cutters, broaches, conical reamers, and various threading tools; etc.; forming tools are used to process gears. Tooth surface or similar workpieces such as hobs, pinion cutters, shaving cutters, bevel gear planers and bevel gear milling cutters. Tool materials are broadly classified into the following categories: high speed steel, cemented carbide, cermet, ceramic, polycrystalline cubic boron nitride, and polycrystalline diamond. Ceramics are used for cutting tools earlier than hard alloys, but they develop very slowly due to their brittleness. However, since the 1970s, it has achieved relatively rapid development. There are two main types of ceramic tool materials, namely alumina and silicon nitride. As a tool, ceramic has the advantages of low cost, high hardness and high temperature resistance, and has a good prospect. The name should be the cutting tool. At present, the domestic and foreign products are very different. The tool is a high-tech consumer product! The best of the YW series, 2 knives, the thick front corner small point 3 to 6 degrees can be 10 degrees after the back angle about. The front corner of the finishing car is 10 to 15 degrees, and the foot can also be 3~5 degrees. The roughness is good. The answer is 2009-05-1517:29. The roughing of the blade is generally 0 degree, but it doesn't matter but it is fine. The machining must be positive 10-15 degrees, so that the surface roughness of your workpiece is better, the blade inclination mainly controls the direction of the chip removal. The positive chip removal is outward and negative, and the workpiece is easily scratched.