Summary. Maintenance Decision Is Typically Made Based On

SUMMARY Maintenance decision is typically made based on tool condition change/degradation. However, the change does not necessarily lead to poor quality of the product. Change-based maintenance decision making may lead to over-maintenance. This report focuses on develop prognosis for maintenance scheduling model. We first study current maintenance situation in Samsung semiconductor system, follow by that, generating data to illustrate the decision making process according to a potential optimization model that accommodates with productivity and preventive maintenance task scheduling in the report. Preventive Maintenance case study of Samsung semiconductor To develop a maintenance approach, it is essential to know the specific process†¦show more content†¦Except these tools, normal PMs are based on CBM strategy. Although it is very important to determine how often PM should be done, the decision making process for PM cycle is still rely on engineering experience. As shown in figure 1, the decision flow of PM cycle for the tool has two phases, and are connected by extension test. Phase I is determined by the supplier with their guaranteed PM cycle. Once the guaranteed is expired, extension test will be applied to the stabilized tool, and followed by a successful extension test, the PM cycle will go to Phase II period. Figure 1 – Decision flow of PM cycle in different period PM Cycle Extension Test When the tool is brought-in for the first time, the supplier will suggest a determined PM cycle. Each tool will have one to three year’s warranty, which is offered by that supplier. After that, the PM cycle will be re-determined according to the cleaning, repair and replacement cycle of the parts that are conducting to the tool. For the stabilized tool, its period is extended by using the evaluation test of PM cycle extension. 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