Machinability is the ease with which a metal can be cut (machined) permitting the removal of the material with a satisfactory finish at low cost.[1] Materials with good machinability (free machining materials) require little power to cut, can be cut quickly, easily obtain a good finish, and do not cause significant wear on the tooling. Factors that typically improve a material's performance often degrade its machinability, presenting a significant engineering challenge.
Machinability can be difficult to predict due to the large number of variables involved in the machining process. Two sets of factors are the condition of work materials and the physical properties of work materials.[2] The condition of the work material includes at least eight factors: microstructure, grain size, heat treatment, chemical composition, fabrication, hardness, yield strength, and tensile strength.[3] Physical properties are those of the individual material groups, such as the modulus of elasticity, thermal conductivity, thermal expansion, and work hardening.[3] Other important factors are operating conditions, cutting tool material and geometry, and the parameters of the specific machining process being performed.[3]
^Degarmo, p. 542.
^Schneider, George, "Machinability of Metals," American Machinist, December, 2009.
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