xiehe model

CNC CNC high-precision hole processing skills

In order to achieve high-speed and high-precision boring, attention must be paid 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 tool must also have high dynamic balance characteristics. Especially for the tooth part of the boring tool, the geometry, tool material and clamping method suitable for high-speed cutting should be selected. The R at the end of the cutting edge should be larger to improve the processing efficiency; under the premise of ensuring the same surface roughness, the feed rate should be increased. However, it should be enough to increase the feed rate, otherwise it will increase the cutting resistance, which is not conducive to improving the processing efficiency. The margin should be set with a negative chamfer less than 0.1mm, which can effectively maintain the stability of tool life.

In addition to using holes, boring and reaming can also be used for high-precision machining of holes. Cooperating with the high-speed spindle of the machining center, the boring tool can be used for high-speed precision machining of holes. According to reports, when boring about φ40mm on aluminum alloy materials, the cutting speed can be increased to more than 1500m/min. This cutting speed can also be used to process steel, cast iron and high hardness steel with CBN sintered body as the cutting edge. It is expected that high-speed machining of boring will be rapidly popularized in the future.

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 tools can be used. This type of tool can obtain good surface roughness and long tool life under the high-speed cutting condition of v=300m/min or more. Coated carbide cutting tools are suitable for high-speed cutting of steel below 60HRC. Tool life is stable, but cutting speeds are slightly slower than cermet tools. Sintered tools are 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 margin part of the CBN tooth should be chamfered properly, which is extremely beneficial to stable high-speed cutting and prolonging tool life. For ultra-high-speed cutting of non-metallic materials such as non-ferrous metals and aluminum alloys, diamond sintered tools can be used for 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 stable cutting.