Abstract
This paper present the effect of drilling parameter such as spindle speed, feed rate and drilling tool size on material removal rate (MRR), surface roughness, dimensional accuracy and burr. In this work, a study on optimum drilling parameter for HSS drilling tool in micro-drilling processes in order to find the best drilling parameter for brass as a workpiece material. Micro drilling experiment with 0.5 mm to 1.0 mm drill sizes were performed by changing the spindle speed and feed at three different levels. The results were analyzed using microscope and surface roughness device. Comparatives analysis has been done between surface roughness, MRR and accuracy of drilled holes by experimentation. From the result, the surface roughness are mostly influenced by spindle speed and feed rate. As the spindle and feed rate increases, the surface roughness will decrease. The tool diameter gives less influence on the value of surface roughness. The value of MRR is decreased when the tool diameter, spindle speed and feedrate are decreases. As drilling tool diameter, feedrate and spindle speed increase the dimensional accuracy of drilled hole will decrease. The increment of spindle speed and feed rate value mostly will affect the tool wear and size of burr on the edge of drilled holes.
Highlights
Extremely important for the manufacturing industry (S.A. Jalali, 1991)
These studies include in the area of modeling of drilling process, vibration drilling, twist drill shape, modeling of drilling tool, tool wear, surface roughness, burr formation
To get a better finishing for drilled holes, many factors need to be considered such as material, spindle speed, feed rate and tool diameter
Summary
Extremely important for the manufacturing industry (S.A. Jalali, 1991). The poor removal of chips in deep drilling of small diameter is often the cause of tool breakage and poor quality surface. The main result of the tests with different drill materials found that expensive bright drills with or without TiN-coating had a lower productivity compared to cheaper black drills This is due to the low feed rate values causing a strong decrease in the chip flow rate. Katsumi, (2002), fabricate a three-dimensional and high aspect ratio of micro-shape This is done by using micro-drilling on monocrystalline silicon using a small drilling tool. Experimental results will show that sliding mode control reduces the nominal torque and cutting force and their variations better than PD control, resulting in a number of advantages, such as an increase in drill life, fast stabilization of the wandering motion, and precise positioning of the holes
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