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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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In-process monitoring and control of microassembly by utilising force sensor

Tangjitsitcharoen S., Tangpornprasert P., Virulsri C., Rojanarowan N.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 31, nr 2

588-594

Purpose: The aim of this research is to develop an in-process monitoring system to control the position of the shaft within a tolerance of ± 2.5 žm regardless of any conditions of the geometries of the shaft and the thrust plate. Design/methodology/approach: To realize an automated and intelligent microassembly process, a method has been developed to monitor and control the position of the shaft in the plate of the high-precision spindle motor for hard disk drive in order to reduce the shaft high problem. The force sensor is utilized and attached on the table of the microassembly machine under the jig of the plate to monitor the in-process pressing force. The experimentally obtained pressing force depends on the variations of the tolerance fitness and the geometrical roundness of the shaft and the plate but it is increased immediately when the shaft touches the stopper on the jig as the setting point. Hence, a method proposed introduces the reference voltage as the threshold value, which is calculated and obtained by taking the differentiation of the in-process pressing force. A slope detector is developed to calculate the output voltage based on the in-process pressing force, and the motor driver of machine is controlled when the obtained output voltage is larger than the reference voltage. Findings: It is proved that the shaft high problem is well controlled and reduced by the method developed regardless of any combinations of the geometries of the shaft and the plate. Practical implications: In this research, the microassembly process of the shaft into the plate of high-precision spindle motor for hard disk drive is showed. Originality/value: This paper has shown the developed the in-process monitoring system and control the manufacturing process automatically.