can be calculated by the finite element method of stress magnitude different speeds to simulate the failure process and improve the design.
2013年7月30日星期二
synthetic diamond powder
Single-crystal diamond and PCD (or PCD / CC) and PCD (or PCD / CC) and between CVD diamond can complement each other well, there are some cross-cutting applications.
Single crystal diamond cut surface of the continuous workpiece, and the workpiece with the PCD cutting surface showing discontinuity of microns, so PCD is only
suitable for general machining area, there are special requirements for some polishing process, When prepared as Al2O3 mirror
, Only the use of natural diamond crystal to achieve the desired surface roughness and dimensional tolerances.
Natural diamonds are rare large size diamond, but the large size of synthetic diamond has now become possible. Its processing with high wear layered wood, its
performance is superior to PCD diamond cutting edge will not cause premature passivated. In the processing of aluminum composite material,
PCD can also be used using TFD (CVD thick). Figure 3 shows two kinds of a PCD and diamond machining TFD 40% SiCυ A356MMC wear curves of the tool material. Figure 3
using the cutting test conditions: cutting speed 400m/min, feed rate of 0.05mm / r
, Depth of cut (cutting tools) 0.5 mm, plus cutting fluid. According to experiments, processing 40% SiCυ matrix composites, using thick-film diamond TFD best effect,
PCD025 followed, PCD002 tool life minimum.
Since the various diamond face in adapting to the complementary nature of processed diamond tool range has been expanded to replace synthetic diamond powder natural diamond,
CVD diamond substitute PCD diamond trends become apparent. Are thus cutting can be realized into a
Efficient and economical processing of a new era, and its degree of substitution depends on both technical and economic factors, especially the blade forming,
grinding, and welding degree of difficulty will directly affect the price and performance of diamond tools.
Typically PCD tool for roughing and requires a higher fracture toughness tool production, CVD single crystal diamond tool thick and are used for high-speed finishing
and semi-finishing.
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