Abstract
Lapping machines are used in a hard disk rough lapping process where a workpiece (a wafer row bar) is locked with a robot arm and rubbed on a lap plate. In this process, the lap plate’s condition and lifetime are among important concerned factors. The lifetime can be too short due to the plate being accidentally scratched by the workpiece during lapping. This problem leads to undesired consequences such as machine downtime and excessive plate material usage. This paper presents an experimental investigation into vibration characteristics of passed and failed lapping scenarios and discusses a potential solution to minimize the serious damage so-called “plate scratch” which intermittently occurs in such process. The experimental results show that, by in situ monitoring vibration and utilizing artificial intelligence, damage minimization can be possible.
Highlights
Lapping or polishing is a process that produces a smooth and lustrous surface finish
The test results include both “healthy” and “unhealthy” processes in which vibration signals were measured at Row Tool (RT) position
This paper has presented an experimental investigation into vibration characteristics of a lapping machine in an hard disk drive (HDD) lapping process
Summary
Lapping or polishing is a process that produces a smooth and lustrous surface finish. This shiny smooth appearance results from the action of abrasive power and a polishing tool. It has been widely used in the production of optical lenses, metallic bearing surfaces, and products requiring excellent finishes [1–5]. It basically consists of a plate, a moving arm (or slider arm), a clamping tool (CT), and a place where a workpiece is fitted. Wear from normal use does occur; plate replacement or refinishing is required
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