Jun 28, 2017
HSS End Mills The type of material
Milling cutter basic knowledge The first section of milling cutter material types and grades 1, milling cutter cutting part of the basic requirements of materials: 1) high hardness and wear resistance: at room temperature, cutting part of the material must have sufficient hardness to cut into the workpiece ; With high wear resistance, the tool is not wear, extend the service life. 2) good heat resistance: the cutting tool in the cutting process will produce a lot of heat, especially in the cutting speed is high, the temperature will be high, so the tool material should have good heat resistance, both at high temperatures still Can maintain a high hardness, can continue to cut the performance, this has the nature of high temperature hardness, also known as hot hard or red hardness. 3) high strength and good toughness: in the cutting process, the tool to bear a great impact, so the tool material to have a high strength, or easy to break and damage. As the cutter will be the impact and vibration, therefore, milling cutter material should also have a good toughness, it is not easy to chipping, fragmentation. 2, milling cutter commonly used materials: (1) high-speed tool steel (referred to as high-speed steel, front steel, etc.), sub-general and special purpose high-speed steel two. It has the following characteristics: a, alloying elements tungsten, chromium, molybdenum, vanadium content is higher, quenching hardness up to HRC62-70. In the 6000C high temperature, can still maintain a high hardness. B, the edge strength and toughness is good, strong anti-vibration, can be used to manufacture cutting speed of the general tool, for poor steel machine, the use of high-speed steel cutter, can still smooth cutting. C, good process performance, forging, processing and grinding are relatively easy, but also can create more complex shape of the tool. D, compared with the carbide material, there are still low hardness, red hardness and poor wear resistance and other shortcomings. (2) Carbide: metal carbide, tungsten carbide, titanium carbide and cobalt-based metal binder made by the powder metallurgy process. Its main features are as follows: high temperature, in the 800-10000C or so can still maintain a good cutting performance, cutting can be used when the high-speed steel than 4-8 times the cutting speed. High temperature hardness, good wear resistance. Low bending strength, poor impact toughness, the blade is not easy to wear very sharp.
Commonly used carbide can generally be three categories: ① tungsten cobalt carbide (YG) commonly used grades YG3, YG6, YG8, where the number that cobalt content of the percentage, the more cobalt, the better the toughness, the more Impact resistance and vibration, but will reduce the hardness and wear resistance. Therefore, the alloy is suitable for cutting cast iron and non-ferrous metals, can also be used to cut the impact of rough and quenched steel and stainless steel pieces. ② Titanium-cobalt-based hard alloy (YT) commonly used brands are YT5, YT15, YT30, figures that percentage of titanium carbide. Carbide containing titanium carbide, can improve the bonding temperature of steel, reduce the friction coefficient, and can improve the hardness and wear resistance, but reduces the bending strength and toughness, so that the nature of brittle, so the The alloy is suitable for cutting steel parts. ③ General Carbide In the above two kinds of hard alloy by adding the right amount of rare metal carbide, such as tantalum carbide and niobium carbide, so that its grain refinement, improve its normal temperature hardness and high temperature hardness, wear resistance, bonding Temperature and oxidation resistance, can make the toughness of the alloy has increased, therefore, this type of carbide knife has a good overall cutting performance and versatility, its grades are: YW1, YW2 and YA6, etc., because of its more expensive , Mainly for difficult to process materials, such as high-strength steel, heat-resistant steel, stainless steel and so on.