Abstract
Cutting regime parameters play an important role in determining the efficiency of the grinding process and the quality of the ground parts. In this study, the influences of the cutting parameters, including the cutting depth (ae), the feed rate (Fe) and the wheel speed (RPM) on the grinding time when grinding tablet shape punches by a cubic boron nitride (CBN) wheel on a CNC (Computerized Numerical Control) milling machine are investigated. The Taguchi technique based on orthogonal array and analysis of variance (ANOVA) was then applied to design the number of experiments and evaluate the influence of cutting depth, feed rate and wheel speed on the grinding time. The results show that among the three cutting parameters, the most influential parameter on the grinding time is the cutting depth. The second influential parameter on the grinding time is the feed rate. The least influential parameter on grinding time is the wheel speed. In addition, the optimal condition of cutting parameters obtained for grinding tablet shape punches by cubic boron nitride wheels on a CNC milling machine are a cutting depth of 0.03 mm, wheel speed of 5000 rpm and feed rate of 3500 mm/min. This optimum cutting parameters ensure the least grinding time.
Highlights
Grinding is an important finishing process for many engineering components to give the best surface quality and the highest accuracy to various hard-to-machine metallic alloys [1]
The grinding wheel rotated around its center and moved in orbit that had been programmed in the machining program
From the above results of the experiment, the predicted optimum value of the grinding time was determined by the levels of the cutting parameters that strongly affect the S/N ratio as follows: tw,op = A3 + B3 + C3 − 2· Tgg where, A3, B3, and C3 are the mean grinding time values corresponding to the cutting depth value, the wheel speed value, and the feed rate value, respectively, at the third level; T gg is the mean grinding time value of the total experiment
Summary
Grinding is an important finishing process for many engineering components to give the best surface quality and the highest accuracy to various hard-to-machine metallic alloys [1]. A study on optimization of dressing parameters for grinding tablet shape punches 90CrSi by CBN wheel on CNC milling machine was carried out [8]. None of the previous researches had studied the problem of optimizing cutting parameters for grinding tablet shape punches by cubic boron nitride wheels (CBN wheels) on CNC milling machine. The input process parameters, including the cutting depth (aed ), the wheel speed (Rpm ) and the feed rate (Fe ), were investigated for evaluating their influence on the grinding time as well as for finding the minimum grinding time when grinding tablet punches with CBN wheel on CNC milling machine by using the Taguchi method. The optimum set of cutting parameters for grinding tablet shape punches by cubic boron nitride wheels on a CNC milling machine has been determined
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