School of Mechanical and Industrial Engineering

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Browsing School of Mechanical and Industrial Engineering by Subject "5why method"

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    Presented in Partial Fulfilment of The Requirement for The Degree of Master of Science in Mechanical Engineering (Industrial Engineering Stream)
    (Addis Ababa University, 2018-10) Adem, Tadesse; Ermias, Tesfaye (PhD)
    This main concern of this study is to improve the productivity of the factory by LEAN approach. The purpose of lean in production is to increase productivity, improve product quality, reduce lead time and eliminate manufacturing waste. The study has been conducted on C&H Garment factory that produces different men’s and women’s garment products, located in Bole Lemmi industry park Addis Ababa. On an earlier stage, a literature review on lean was conducted, from the creation of the concept of LEAN to its main tools and techniques. Valuable data has been collected from the case study (C&H Garment Company) by observation, and interview from management body. The collected data has been analyzed according to the relevant time. For this purpose MS-excel, statistical tools, MS-Visio have been applied; in addition to these, industrial or lean tools were considered. The research approach considers the existing factory manufacturing culture and the lost events with respect to lean tools and techniques, to determine the lean tool gap the main waste of lean are identified with case company. Besides waste of lean absenteeism is one crucial event on factory productivity, included on study. Finally, lean productivity improvement methods were propose. But in practical validation of lean tool 5why methods have been exercised to improve rework and defects , based on the average defect rate ,production rate, cycle time, production costs were improve by 40.91%,50.85%,13%,40.91%, respectively. Cellular manufacturing and other approaches have not been implemented, although the company has been left prepared for an implementation in the future.