In order to improve the machining speed and precision of computer gong, we must pay attention to the influence of cutter tooth vibration on the surface roughness and tool life. In order to prevent the decline of machining accuracy and tool life, the selected machining center must be equipped with spindle with excellent dynamic balance performance, and the selected boring tool must also have high dynamic balance characteristics. Especially for the cutter teeth of boring tools, the geometry, tool material and clamping method suitable for high speed cutting should be selected. The R at the end of cutting edge should be larger in order to improve the processing efficiency; on the premise of ensuring the same surface roughness, the feed rate should be increased. But increasing the feed rate should be enough, otherwise it will increase the cutting resistance, which is not conducive to improving the processing efficiency. The cutting edge belt should be set with negative chamfering less than 0.1 mm, which can effectively maintain the stability of tool life. In addition to CNC cutting, boring and reaming can also be used for high precision machining. With the high speed of machining center spindle, boring tools can be used for high-speed precision machining of holes. It is reported that the cutting speed can be increased to more than 1500m / min when boring about 40mm on aluminum alloy. When CBN sintered body is used as cutting edge to process steel, cast iron and high hardness steel, such cutting speed can also be used.
As for the tool material, it depends on the nature of the material to be processed. For example, when machining steel below 40HRC, cermet tools can be selected. This kind of tool can obtain good surface roughness and long tool life under the condition of V = 300m / min or above. Coated cemented carbide tools are suitable for high speed cutting of steel below 60HRC. The tool life is very stable, but the cutting speed is slightly lower than cermet tools.
Sintered body tool is suitable for machining high hardness steel, cast iron and other materials, cutting speed can reach more than 1000m / min, and tool life is very stable. The edge belt of CBN cutter teeth should be chamfered properly, which is very beneficial to high speed cutting and tool life extension. In the ultra-high speed cutting of aluminum alloy and other non-ferrous and non-metallic materials, diamond sintered body tool can be selected. This kind of tool has the advantages of stable cutting and long tool life. It should be noted that when diamond tools are used, the cutting edge must be chamfered, which is an important condition to ensure the cutting stability.
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