Yield Improvement Through SPC and DOE


Zayas-Castro, Jose L., Ph.D.,; Mundo-Garcia, Victor J.   (1992, ASQC)   UPR-RUM, Mayaguez, Puerto Rico 00681

Annual Quality Congress, Nashville TN    Vol. 46    No. 0
QICID: 9863    May 1992    pp. 444-450
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Article Abstract

Any production process must maintain and continuously improve its yield is an effort to attain an ideal goal of 100% yield. This has a direct impact on production schedules, operations management, customer satisfaction and overall company productivity benefits.

The main objectives were to identify significant and controllable factors affecting the manufacturing of medical devices, and to manipulate these factors to bring more stability to the process. The methodology was based on Statistical Process Control (SPC) and more sophisticated techniques such as Design of Experiments.

The most important results of these experiments are (1) if there were significant differences among cavities within a mold, the worst cavities were repaired using the best as a standard; (2) the current manner of storing component A, whose height dimensions is crucial, permits a deformation in its height. This affects product yield.

Yield also improved once operators were trained in proper component assembly. The estimated dollar value of these benefits was in excess of $100,000 per year.


Manufacturing,Experiments,Design of experiments (DOE),Variation,Statistics,Statistical process control (SPC),Puerto Rico

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