Fig. 2 Wear curve of cermet cutter and YG8 cutter when cutting chilled cast iron
(f=0.1mm/r, ap=0.4mm, vc=60m/min)
Fig. 3 Wear curve of cermet cutter and YG8 cutter when cutting stainless steel
3 test results and the microstructure of the cermet tool analysis <br> <br> microstructure of the cermet tool 1 as shown in FIG. It can be seen from the figure that the cermet structure consists of a ceramic phase and a metal phase (Fig. 1a); the coarser ceramic phase has a core/shell structure (Fig. 1b), the core composition is Ti(C,N) solid solution, and the shell component is mainly It is a (Ti, Mo, W) (C, N) solid solution. Compared with the traditional Ti(C,N)-based cermet microstructure, it is known that the addition of nano-TiN to the TiC-based cermet is more significant than the addition of micro-TiN.
Comparison of cutting performance between cermet tool and YG8 tool The tool wear curve of cutting chilled cast iron with cermet tool for chilled cast iron and YG8 carbide tool is shown in Fig. 2. It can be seen from the figure that the cutting performance of the cermet tool is quite different from that of the YG8 cemented carbide tool. The initial wear of the cermet tool is very fast. In less than three minutes, the wear amount VB reaches 0.4 mm, and the wear rate decreases. However, it is still relatively fast, and there is almost no stable wear period, and finally the tool chipping fails.
Cutting tests were carried out under other cutting conditions, and it was found that the cutting life (t) of the cermet tool was low (up to several minutes), and the failure mode was generally chipping or micro-collapse. It can be seen that the cermet cutter is not suitable for cutting chilled cast iron, mainly because the diametrical bending strength and fatigue strength are low, and the cutting force and the cutting force fluctuate greatly when cutting chilled cast iron, so the cermet cutter pole Easy chipping failure. The YG8 cemented carbide tool has high strength, good toughness and good mechanical fatigue resistance. The tool life is longer when cutting chilled cast iron. In addition, tool geometry is also an important factor affecting tool life when cutting chilled cast iron. In order to reduce chip deformation and cutting force, it is generally necessary to use a small front angle and a back angle. In order not to reduce the edge strength, it is necessary to round or sharpen the cutting edge and eliminate the blade edge by grinding.
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