Experimental Study of Particles Induced by Screw Tightening Process for Hard Disc Drive Assembly: Effects of ‘Bit’ Speed

Authors

  • Somchai Laksanasittiphan King Mongkut’s University of Technology Thonburi
  • Karuna Tuchinda King Mongkut's University of Technology North Bangkok
  • Anchalee Manonukul National Science and Technology Development Agency
  • Surasak Suranuntchai King Mongkut’s University of Technology Thonburi

DOI:

https://doi.org/10.4186/ej.2018.22.1.65

Abstract

The morphology of particles generated during screw tightening process in hard disc drive assembly was studied using a media installing tool kit under a class 100 clean room condition. The screws were made of martensitic 410 stainless steel and the ‘bit’ was made of S2 tool steel. The ‘bit’ speeds used during the screw tightening process can be divided into two steps: the beginning and the final speeds. The effect of both speeds on the morphology of particles generated was investigated. The studied parameters were the aspect ratio and the appearance cross-sectional area of particles. Particles with different sizes were found suggesting that there were different wear mechanisms. Small particles were caused by adhesive wear, while the larger particles were generated by fatigue wear. The appearance cross-sectional area of particles was found to decrease with increase in both speeds within the speed of 250 r/min, after which the appearance crosssectional area appeared to be constant. The effect of cold-weld at asperities was obvious resulting in an increase in aspect ratio at a higher speed. The understanding of the effect of bit speed on the particles morphology during the screw tightening processes could be very useful in the design of the cleaning system in hard disc drive production.

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Author Biographies

Somchai Laksanasittiphan
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Department of Tool and Materials Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand

Karuna Tuchinda
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Department of Mechanical and Process Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand

Anchalee Manonukul
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National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency, Pathumthani 12120, Thailand

Surasak Suranuntchai
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Department of Tool and Materials Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand

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Published In
Vol 22 No 1, Jan 31, 2018
How to Cite
[1]
S. Laksanasittiphan, K. Tuchinda, A. Manonukul, and S. Suranuntchai, “Experimental Study of Particles Induced by Screw Tightening Process for Hard Disc Drive Assembly: Effects of ‘Bit’ Speed”, Eng. J., vol. 22, no. 1, pp. 65-76, Jan. 2018.
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