TECHNICAL INFORMATION NORTON WINTER PRECISION TECHNOLOGY TOOL GRINDING / 159 MATERIAL REMOVAL RATE The material removal rate, MRR’ or Q‘w, is expressed in mm3/s and defines the volume of workpiece material ground per unit time (second). The specific material removal rate, MRR’ or Q‘w, refers to the removal rate per millimetre of wheel contact width and is expressed in units of [mm3/(s. mm)]. PARAMETERS INFLUENCING GRINDING RESULTS The table shows some correlations between process variables and the grinding results. APPRAISAL CRITERION INFLUENCING PARAMTERS CUTTING FORCE F F = F(…) GRINDING RATIO G G = F(…) ROUGHNESS RA RA= F(…) TEMPERATURE ϑ ϑ = F(…) Machine- and Operation Paramters Cutting Speed vc (m/s) F VC G VC Ra VC ϑ VC Material Removal Rate Q‘w (mm3/s) F Q‘w G Q‘w Ra Q‘w ϑ Q‘w Coolant (Oil Content) F Oil Content Oil Content G Oil Content Ra Oil Content ϑ Grinding Wheel Grit Size (μm) F Grit Size Grit Size G Grit Size Ra Grit Size ϑ Concentration (Carat/cm3) F Concentration Concentration G Concentration Ra Concentration ϑ
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