Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse
Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
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| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2016
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| Online Access: | http://hdl.handle.net/1721.1/101336 |
| _version_ | 1811082465012350976 |
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| author | Fong, Hui Ni Grace |
| author2 | Stephen C. Graves. |
| author_facet | Stephen C. Graves. Fong, Hui Ni Grace |
| author_sort | Fong, Hui Ni Grace |
| collection | MIT |
| description | Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015. |
| first_indexed | 2024-09-23T12:03:32Z |
| format | Thesis |
| id | mit-1721.1/101336 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:03:32Z |
| publishDate | 2016 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1013362019-04-12T09:28:51Z Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse Fong, Hui Ni Grace Stephen C. Graves. Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering. Mechanical Engineering. Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015. Cataloged from PDF version of thesis. Includes bibliographical references (pages 85-86). The present work addresses an operational inefficiency problem at a semiconductor equipment manufacturing warehouse, Varian Semiconductors Associates and Equipment (VSEA). This problem is important because if unresolved, the warehouse is unable to meet the part delivery time target of 24 hours during the busy period. The downstream effects of the late part delivery are delayed production schedules and in the worst case scenario, a missed shipment to the customer, which is very costly. In order to improve the efficiency of the warehouse so as to consistently deliver parts on time, the picking efficiency needs to be enhanced. Parts are primarily picked from two types of storage locations - GL shelves and Vertical Lift Modules (VLMs). The picking efficiency can be improved by the simultaneous reduction in workload on GL and improvement in the VLM picking efficiency. The first part of this thesis focuses on improving the picking inefficiency at the VLMs by employing a more efficient picking method. From our time study, we find that the pick-and-consolidate (parallel picking) is more efficient than pick-and-pass (sequential picking). The average makespan time savings per order by pick-and-consolidate is 8% (20 minutes). The second part of this paper discusses what is required to maintain a high VLM picking efficiency. New metrics to measure the workload distribution of the VLMs and the average flow time per order are proposed. Three dynamic slotting methods that maintain a balanced workload distribution across the VLMs without the need for periodic review are also examined. The methods are evaluated based on how balanced is the workload distribution across the VLMs and the cost of implementation. by Hui Ni Grace Fong. M. Eng. in Manufacturing 2016-02-29T15:00:57Z 2016-02-29T15:00:57Z 2015 2015 Thesis http://hdl.handle.net/1721.1/101336 938858545 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 86 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Fong, Hui Ni Grace Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| title | Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| title_full | Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| title_fullStr | Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| title_full_unstemmed | Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| title_short | Improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| title_sort | improving and maintaining the operational efficiency of a semiconductor equipment manufacturing warehouse |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/101336 |
| work_keys_str_mv | AT fonghuinigrace improvingandmaintainingtheoperationalefficiencyofasemiconductorequipmentmanufacturingwarehouse |