In metal cutting, a lot of heat are usually generated that can cause wear to the metal cutting tools, due to the friction between them. A rotary cutting tools was suggested to reduce the cutting point temperature, a round tool that rotates the cutting edge and cooling is initialized during the period of non-cutting, and this is effective in decreasing the temperature of the tool. Prior to this work, large quantity of flood coolant were used and it excess cooling was found to decrease tool life.
Therefore there is need for new coolant whose excess will not decrease tool life. From literature, minimum quantity lubrication MQL technique has been introduced, this supply a small amount of oil with compressed air, it is expected to offer better lubrication and to have a moderate cooling effect on the rotary cutting tool. For better understanding of the new technique, Hiroyuki Sasahara and colleagues proposed to clarify the effect of the amount of minimum quantity lubrication on cutting temperature and tool wear by the tool life test in driven rotary cutting. The research work is now published in the peer-reviewed journal, Precision Engineering.
The authors used a multitasking lathe and the cutting point temperature was measured using the tool-workpiece thermocouple method. The authors also considered the effect of oil mist supply on cutting point temperature and tool wear during driven rotary cutting and varied cutting speed from 100 m/min to 500 m/min to compare minimum quantity lubrication with dry coolant.
They observed the effect of adhesion was larger as the cutting speed increases, leading to the amount of the lubricant used to increase and also decreasing the amount of heat generated due to friction on the adhesion area. This study was able to point out that at a cutting speed of 100 m/min, severe adhesion of chips on the rake face occurs. The study team also suggested that an appropriate cutting speed range should possibly be shifted higher from the viewpoint of cutting temperature and adhesion in rotary cutting.
Hiroyuki Sasahara1, Kentarou Satake1, Wataru Takahashi2, Masato Goto1, Hiromasa Yamamoto3, The Effect of oil Mist Supply on Cutting Point Temperature and Tool Wear in Driven Rotary Cutting, Precision Engineering 48 (2017) 158–163.Show Affiliations
- Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan.
- Mitsubishi Materials Corporation, 1511 Furumagi, Josho, Ibaraki, 300-2795, Japan.
- Yamazaki Mazak Corporation, Oguchi-cho, Aichi, 235-8501, Japan.
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