Vision Solutions for Metrology
and Assembly Verification
Casting Measurement
Case Brief
Friday, May 18, 12
Background
• Customer asked Coherix to measure Cubed Engine
Head on 5/27/2011
– Cast Locator plane to cubed milled surface
– Milled surface to combustion chamber buttons
• Coherix picked up head on 6/1/2011
• Head was measured on 6/2/2011
• Customer visited Coherix on 6/3/2011 and brought
a cast part.
• The cast part was measured by Coherix the week of
6/6/2011
Friday, May 18, 12
Head Deck Points of Interest
Casting
Locator
Chamber
Depth
Button
Rough Milled
Cube Surface
Friday, May 18, 12
Chamber
Depth
Button
Casting
Locator
Chamber
Depth
Button
Casting
Locator
All points of interest on part
scanned in 40 seconds, resulting in
over 4 million data points.
Friday, May 18, 12
Head #1: Cubed Head Milled Surface is
Parallel to Cast Locators within ~0.10 mm
Friday, May 18, 12
-13.5 mm
-13.75 mm
-14.0 mm
Friday, May 18, 12
Cubed Part Findings
• Cast Locator plane is parallel to cubed milled surface
• Milled surface to combustion chamber buttons not parallel
– Combustion chambers up to .5 mm out of parallel
• Next step: Measure same features on casting
Friday, May 18, 12
Cast Head Points of Interest
Combustion
Chamber
Buttons
C
Friday, May 18, 12
Cast Locators
B
A
Head #1: Cubed Head Combustion
Chamber Buttons height relative to plane
through cast locators
~0.5mm
A
Friday, May 18, 12
B
C
Head #2: Cast Head Combustion Chamber
Buttons height relative to plane through cast
locators
B
C
~0.5mm
A
Friday, May 18, 12
Conclusions
• Milled surface to combustion chamber buttons not parallel in
casting or cubed part
– Combustion chambers up to .5 mm out of parallel in both cases
• Parts shipping from casting operation have the same variation
• Measuring the cast parts would prevent the shipment of nonstandard castings to the final customer
• The cast part would not have any more money invested in it
because it would be detected at the casting operation and
contained
• The casting process could be adjusted proactively
Friday, May 18, 12
Vision Solutions for Metrology
and Assembly Verification
Friday, May 18, 12