Title

Lean Manufacturing in Temperature Dependent Processes with Interruptions

Publication Type

Journal Article

Publication Date

2003

Abstract

A particular difficulty arises when lean manufacturing principles are applied to temperature dependent processes. Specifically, when an interruption occurs, lean manufacturing advocates stopping the production line to find the root cause of the problem. However, interruptions in temperature dependent processes will cause work-in-progress and process equipment to cool down and quality problems are likely when production restarts. This difficulty could be countered through a detailed process model, but apart from the difficulty of creating perfect process models with accurate inputs, the use of such a system would separate shop floor operators from the problem-solving process. Instead, a response to interruptions is sought in the form of a script of actions which can be used to train operators. In order to develop an appropriate script, a generic model of a set of temperature dependent processes is defined in which the states of processes and products are time dependent. A hypothetical profit function is defined for the processes and it is shown how this could be optimized by dynamic programming. The dynamic programming process is then translated into a script to guide operators in decision-making during interruptions. The script is demonstrated with a simulation model of an extrusion process, and the results suggest that the new script will result in improved throughput and reduced scrap in the presence of interruptions. [PUBLICATION ABSTRACT]

Discipline

Business | Computer Sciences | Operations Research, Systems Engineering and Industrial Engineering

Research Areas

Information Systems and Management

Publication

International Journal of Operations and Production Management

Volume

23

Issue

11

First Page

1377

Last Page

1400

ISSN

0144-3577

Identifier

10.1108/01443570310501899

Publisher

Emerald

Additional URL

http://dx.doi.org/10.1108/01443570310501899