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Unformatted text preview: Machinability 89 Valery Marinov, Manufacturing Technology 5.9 MACHINABILITY Introduction Machinability is a term indicating how the work material responds to the cutting process. In the most general case good machinability means that material is cut with good surface Fnish, long tool life, low force and power requirements, and low cost. A closer deFnition of machinability requires that some quantitative judgements be made. Several pos- sibilities are available, but in practice so called machinability index is often quoted. The machinability index K M is deFned by K M = V 60 /V 60R where V 60 is the cutting speed for the target material that ensures tool life of 60 min, V 60R is the same for the reference material. Reference materials are selected for each group of work materials (ferrous and non-ferrous) among the most popular and widely used brands. If K M > 1, the machinability of the target material is better that this of the reference material, and vice versa. Note that this system can be misleading because the index is different for different machining versa....
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