The design principle and application technology of single crystal diamond cutting tool mainly have the following points.
1. Mirror processing mechanism of single crystal tool.
After machining, the residual area height h=f/ (CTGKR + CTGKR ') is the theoretical roughness value of the processed surface, which decreases with the decrease of the feed amount f, the cutter's main Angle kr and the parataxis kr '. Due to the decrease of the main Angle kr will make Fy force increases quickly and cause tool vibration, reduce feeding f can affect the cutting efficiency, so the general deputy Angle by reducing kr 'to reduce the surface roughness value.
The surface of the conventional cutting tool is rough, and the blade is uneven. If the selection is too small, on the one hand, the unevenness of the cutting edge will be reflected on the processed surface. On the other hand, it will aggravate the friction between the auxiliary blade surface and the processed surface, which will "pull wool" on the processed surface. So in conventional cutting, Angle of about 2 ° minimum value when processing surface roughness, further reducing vice Angle will worsen already processing surface quality.
The surface roughness value of single crystal diamond tool is less than Ra0.01 microns, the blade quality can reach at least 100 times microscope without defect, together with the friction coefficient is very small, so the vice Angle limit can be reduced to 0 ~ 2 ', which can make the processing surface roughness of the theoretical value is close to or equal to zero, the actual surface roughness value can reach mirror or super smooth surface.
Thus, in terms of cutting tool itself, and single crystal mirror machining mechanism of the cutting tool is through the tool of the super smooth surface and no defects of vice cutting edge (repairing the light blade), makes the processing surface roughness of the theoretical value is close to zero for mirror surface machining effect.
2. Single crystal diamond tool design.
The main factors that need to be considered when designing a single crystal tool are: the accuracy of processing parts; The actual processing conditions; The properties of diamond materials.
When designing a single crystal cutter, the following principles should be followed: the shape of the tool should be as simple as possible because of the hardness and difficulty of the diamond. According to the characteristics of single crystal diamond brittleness and poor impact resistance, it should be combined with the actual machining conditions to improve the impact resistance of the blade by optimizing the geometrical shape of the tool. According to the precision of the machining part, the length of the blade should be designed and the cutting ability of the cutter should be considered.
