The term machinability refers to the ease with which a metal can be machined to an acceptable surface finish. Materials with good machinability require little power to cut, can be cut quickly, easily obtain a good finish, and do not wear the tooling much; such materials are said to be free machining. The factors that typically improve a material's performance often degrade its machinability. Therefore, to manufacture components economically, engineers are challenged to find ways to improve machinability without harming performance.
Machinability can be difficult to predict because machining has so many variables. Two sets of factors are the condition of work materials and the physical properties of work materials.
The condition of the work material includes eight factors: microstructure, grain size, heat treatment, chemical composition, fabrication, hardness, yield strength, and tensile strength.
Physical properties are those of the individual material groups, such as the modulus of elasticity, thermal conductivity, thermal expansion, and work hardening.
Other important factors are operating conditions, cutting tool material and geometry, and the machining process parameters.
Other articles related to "free machining, free, machining":
... There are four main types of free machining steel leaded, resulfurized, rephosphorized and resulfurized, and super ... Super free-machining steels are alloyed with tellurium, selenium, and bismuth ... SAE steel grades for free-machining steel Type SAE designation Leaded 12L13 12L14 Rephosphorized and resulfurized 1213 ... Resulfurized 1119. ...
... lubricity coolant and keeping the cutting area free of chip build up ... This means less wear on the tools and easier machining ...
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