How to processing single crystal diamond use diamond grinding wheel?
Reasons for difficult grinding of single crystal:
Because of the single crystal diamond is single - carbon atoms in crystal, the lattice structure belongs to such as shaft face centered cubic crystal system (a kind of the highest density of atomic crystal system), the key link for SP3 hybridization between carbon atoms covalent bond, has a strong bonding force, stability, and directionality, is the hardest substance known, in the nature the microhardness of up to 10000 hv.
With its physical and mechanical properties, it is not easy to produce stickiness and chip nodulation when cutting, but also theoretically can obtain atomic edge straightness and sharpness, so it is an ideal material for ultra-precision cutting, micro cutting and nano cutting.
In addition, the anisotropy of natural diamond crystals is caused by the difference of atomic arrangement and atomic density on each crystal plane and the difference of distance between crystal planes.
Therefore, not only the physical and mechanical properties of each crystal face of diamond are different, but also the difficulty of manufacturing and service life are different, and the microcosmic strength of each crystal face is also significantly different.
In actual production, the edge of single crystal diamond tool is very easy to produce burst and serration.
Thus it can be seen that the cutting edge treatment method of single crystal diamond tool is one of the core technologies of manufacturing single crystal diamond tool.
Traditional single crystal diamond tool grinding method;
Is first in the FC-200D or Switzerland EWAG-RS15 knife grinder with W20 diamond grinding wheel rough grinding edge, with W8 grinding wheel half fine grinding, then with W4 grinding wheel fine grinding, finally in the UK PG3B knife grinder or high phosphorus cast iron grinding disc fine grinding edge.
However, this grinding method has the following disadvantages:
1. The quality of the cutting edge is not stable;
2. It is difficult to ensure that there is no fine serration defect on the cutting edge when it is detected under a microscope of 500 times.
3. The sharpness of the cutting edge is difficult to reach the radius of the blunt circle.
0. LWN.
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