Interaction of bridge carrier in lapping process (Thai)

Abstract

Slider or Read/Write heads is the most important component for read and write data process of Hard
Disk Drive (HDD). From all over production, the critical process in slider production is lapping process.
Lapping process is performed in the purpose of good data transition by lap the tip of slider to open the head
pole. As the result of small size, very few grinding distance, and simultaneous multi-head grinding, so the 
bridge carrier has become necessary as an instrument, which is used to control lapping process to meet quality
and other requirements. Bridge carrier is also an instrument, which carries slider bar and transmits lapping
force from lapping machine to slider bar as well. This article is a studying regarding to forces and changing
distance on slider bar surface when the bar is pressed or pulled by using Finite Element Method (FEM) for
simulation and then proving the results by experimentation. According to limitation of existing instrument,
which is unable to experiment with the little amount of force, the experimental forces are set as 1, 2 and 3 lbf
respectively and assigned the forces to simulate also. The results show trends of maximum bending distance in
the same direction; however, the sizes are different. The relationship between simulation and experimental
results are linear regressions since the value of R² is almost equal to 1. Finally the predictable equation is
formulated to predict slider bar bending distance by assign tension force or compression force to the first,
twelfth and twenty forth teeth or finger; furthermore, defective bridge carrier can be found by using this
equation without visual inspection. And this simulation and equation can be represented for future works.