Balancing work release based on both demand and supply variables
First Claim
1. A method of generating a work release plan for a manufacturing system, said method comprising:
- prioritizing scheduled lots in order of their critical ratios;
estimating an initial daily release quota for the scheduled lots based on both pull and push requirements;
determining detailed capacity constraints for the manufacturing system;
testing whether the initial daily release quota complies with the detailed capacity constraints; and
if the detailed capacity constraints are violated, rearranging the lots in the initial daily release quota so that the detailed capacity constraints are met.
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Abstract
A systematic approach for generating a work release plan that considers both demand and supply variables. The approach comprises prioritizing scheduled lots in order of their critical ratios, estimating an initial daily release quota for the scheduled lots based on both pull and push requirements, and determining detailed capacity constraints for the manufacturing system. The approach further comprises testing whether the initial daily release quota complies with the detailed capacity constraints, and, if the detailed capacity constraints are violated, rearranging the lots in the initial daily release quota so that the detailed capacity constraints are met.
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Citations
20 Claims
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1. A method of generating a work release plan for a manufacturing system, said method comprising:
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prioritizing scheduled lots in order of their critical ratios;
estimating an initial daily release quota for the scheduled lots based on both pull and push requirements;
determining detailed capacity constraints for the manufacturing system;
testing whether the initial daily release quota complies with the detailed capacity constraints; and
if the detailed capacity constraints are violated, rearranging the lots in the initial daily release quota so that the detailed capacity constraints are met. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of generating a wafer start plan for a semiconductor fabrication facility, said method comprising:
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prioritizing scheduled wafer lots in order of their critical ratios;
estimating an initial daily wafer start quota based on both pull and push requirements;
determining detailed capacity constraints for the semiconductor fabrication facility;
testing whether the initial daily wafer start quota complies with the detailed capacity constraints; and
if the detailed capacity constraints are violated, rearranging the wafer lots in the initial daily wafer start quota so that the detailed capacity constraints are met. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for generating a work release plan for a manufacturing system, said system comprising:
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means for prioritizing scheduled lots in order of their critical ratios;
means for estimating an initial daily release quota using both demand and supply requirements;
means for determining detailed capacity constraints for the manufacturing system;
means for testing whether the initial daily release quota complies with the detailed capacity constraints; and
if the detailed capacity constraints are violated, means rearranging the lots in the initial daily release quota so that the detailed capacity constraints are met.
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20. A computer-readable medium having computer code recorded thereon executable by a computer, said computer code for generating a work release plan for a manufacturing system, said computer code comprising instructions for causing the computer to:
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order scheduled lots according to their critical ratios;
estimate an initial daily release quota for the scheduled lots using both supply and demand requirements;
determine detailed capacity constraints for the manufacturing system;
test whether the initial daily release quota complies with the detailed capacity constraints; and
if the detailed capacity constraints are violated, rearrange the lots in the initial daily release quota so that the detailed capacity constraints are met.
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Specification