Boots – shoes – and leggings
Patent
1997-01-27
1999-03-09
Elmore, Reba I.
Boots, shoes, and leggings
36446806, G06F 1711
Patent
active
058809600
ABSTRACT:
The invention provides an index of line balance method for maintaining optimum queued quantities of products at a manufacturing step and over an entire manufacturing line. The method begins by: first, assigning a daily standard move of product (Std Move) which should be produced in a manufacturing line. Second, the standard WIP StdWIP is calculated for each manufacturing stage i by multiplying the theoretical cycle time C/T of each stage by the daily standard move StdMove; (i.e., StdWIP=CT*StdMove). Third, the difference Di between the current WIP CWi and standard WIP StdWIP at every stage i. (Di=Cwi-Swi, ) is calculated. Fourth, the cumulative difference CDi between current WIP Cwi and standard WIP StdWIP of every stage i from stage i to stage n is calculated. ##EQU1## Fifth, the index of line balance BIi is calculated by dividing the sum of all positive CDi from stage i to stage n by the absolute value of the sum of all negative CDi from stage i to stage n. Next, the index of line balance BIi for each stage i is plotted as a line chart for each stage i. Lastly, additional production resources (e.g., tools) are allocated to the stages that have an index of line balance BIi greater than 1.2 and production resources are reduced to the stages that have an index of line balance BIi less than 0.80. The method reduces WIP, cycle time and costs by better allocating manufacturing resources.
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G. Leonovich, An Approach for Optimizing WIP/Cycle Time/Output in a Semiconductor Fabricator, IEEE, pp. 108 to 111, Sep. 1994.
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Hsu Yi-Chin
Huang Sheng-Rong
Lin Kuo-Chen
Ackerman Stephen B.
Chase Shelly A
Elmore Reba I.
Saile George O.
Stoffel William J.
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