RNariman Metal-Casting Consulting, Inc.

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RNariman Metal-Casting Consulting, Inc.
Examples of data driven analysis and
problem-solving.
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Cause and Effect diagram developed by a scrap
reduction team.
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Cause and Effect Matrix analysis off previous
slide fishbone chart.
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Major jump in scrap in a difficult alloy
5.51 mean
Means Feb05- 5.88 March05- 9.28
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These analyses indicate that Nickel levels above
.3 have a powerful effect on hardness after
anneal, while the effect of Copper is not
sifnificant.
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Findings in a DOE exercise.
DOE Analysis and Refinement Intermediate Step
Significant factors represented by bars cut by
the red dotted line.
ANOVA table showing that two main and one two-way
interaction effects are significant . Low
residual error SS indicates that the regression
model is valid.
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Nickel is out of control
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Improvement in pouring temperature control
6/23-8/8, 2003
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Multi-Vary analysis Significant effect of shell
sand in three defect categories.
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Pareto analysis showing majority of defects
being on a particular area of the
casting. Subsurface pinhole defects are likely
related to the shell core sand used in that
surface.