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Machining skills of high precision holes in cnc

December 5, 2022

Machining skills of high precision holes in cnc
In order to achieve high-speed and high-precision boring, it is necessary to pay attention to the influence of tool tooth vibration on surface roughness and tool life. In order to prevent the reduction of machining accuracy and tool life, the selected machining center must be equipped with a spindle with excellent dynamic balance performance, and the selected boring cutter must also have high dynamic balance characteristics. Especially for the tooth part of the boring cutter, the geometric shape, tool material and clamping method suitable for high-speed cutting shall be selected. The R at the end of the cutting edge should be larger to improve the processing efficiency; On the premise of ensuring the same surface roughness, the feed rate should be increased. However, it should be enough to increase the feeding amount, otherwise it will increase the cutting resistance, which is not conducive to improving the processing efficiency. The edge band shall be set with a negative chamfer less than 0.1mm, which can effectively maintain the stability of the tool life.

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In addition to CNC precision machining holes, you can also use boring and reaming for high-precision machining of holes. With the high-speed spindle of the machining center, the boring cutter can be used for high-speed precision machining of holes. It is reported that boring on aluminum alloy materials φ When it is about 40mm, the cutting speed can be increased to more than 1500m/min. This cutting speed can also be used to machine steel, cast iron and high hardness steel with CBN sintered body as cutting edge. It is expected that high-speed boring will be rapidly popularized in the future.

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As for the tool material, it depends on the nature of the material being processed. For example, when processing materials such as steel below 40HRC, cermet cutters can be used. This kind of tool can obtain good surface roughness and long tool life under high speed cutting conditions of v=300 m/min. Coated carbide tools are suitable for high-speed cutting of steel below 60HRC. The tool life is stable, but the cutting speed is slightly lower than that of cermet tools. Sintered tool is suitable for processing high hardness steel, cast iron and other materials. The cutting speed can reach more than 1000m/min, and the tool life is very stable.
The edge band of CBN gear should be chamfered properly, which is very beneficial to stable high-speed cutting and prolonging tool life. When cutting non-metallic materials such as nonferrous metals and aluminum alloys at ultra-high speed, diamond sintered tools can be used to ensure stable cutting and long tool life. It should be noted that when using diamond tools, the cutting edge must be chamfered, which is an important condition to ensure cutting stability.