Design of fuzzy logic for hard disk drive's arm bending machine

Abstract

The HDD arm is one of the key elements in HDD head assembly industry. The HDD arms are required to have a correct height measured from the reference. The HDD arms produced in the industry have to pass an inspection process to check whether the requirement is met. If some do not meet the requirement, the adjustment has to be done. The HDD arm adjustment is done by bending the arm up or down in order to make it be at the correct height. The problem of bending process currently adopted in the industry is that some of the bended HDD arms still do not meet the requirement since the bending force is fixed to some values and not adaptively adjusted. In this paper, a technique called Fuzzy logic is proposed to be used as a predefined scheme to control the bending force. From the experimental data in bending HDD’s arms for various cases, the Fuzzy logic to control the bending force is designed. Comparing to the technique used currently in the industry, this proposed technique can help reducing the rejection rate of the HDD arms passed through the bending process.