Cutting conditions for difficult-to-machine materials
The cutting conditions of difficult-to-machine materials have always been set relatively low. With the improvement of tool performance, the emergence of high-speed and high-precision CNC machine tools, and the introduction of high-speed milling methods, at present, the cutting of difficult-to-machine materials has entered a period of high-speed machining and long tool life. Now, the use of small cutting depth to reduce the cutting edge load, which can improve the cutting speed and feed rate of processing, has become the best way to cut difficult-to-machine materials. Of course, it is also extremely important to choose tool materials and tool geometries that adapt to the unique properties of difficult-to-machine materials, and to optimize the cutting path of the tool.
For example, when drilling stainless steel and other materials, due to the low thermal conductivity of the material, it is necessary to prevent a large amount of cutting heat from remaining on the cutting edge. Therefore, intermittent cutting should be used as much as possible to avoid friction and heat generation between the cutting edge and the cutting surface, which will help to extend tool life and ensure the stability of cutting. When roughing difficult materials with ball end mills, the tool shape and fixture should be well matched, which can improve the vibration precision and clamping rigidity of the cutting part of the tool, so as to ensure that the feed per tooth is increased to the maximum under the condition of high-speed rotation, and at the same time, the tool life can be extended.
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