Chrome Machine Roll Defect
Chrome Machine Roll Defect
(OP)
I am currently working on a project for detecting and measuring “Gloss Bands” in chrome plated machine rolls. These “Gloss Bands” are essential a visual defect that is transferred onto the product. When viewing in certain lighting/angles, the surface appearance of the roll shows variation.
Any explanation for this? Appears the difference in undetectable by Gloss meter, leading me to believe the term “Gloss Bands” may be a misnomer.
Thanks.
Any explanation for this? Appears the difference in undetectable by Gloss meter, leading me to believe the term “Gloss Bands” may be a misnomer.
Thanks.





RE: Chrome Machine Roll Defect
Assume that this plating is 'flash' or thin protective... not 'engineering' which is excessively built-up and then precision-ground to specified dimensions...?
Are the 'gloss bands' showing any signs of color [specifically yellow, blue or blue-green?]?
Plating tends to mimic [follow] the micro contour [waviness/lay] of the underlying machined/ground surface.
Also, anode placement and batch agitation may have to be adjusted.
Regards, Wil Taylor
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RE: Chrome Machine Roll Defect
Rolls that require uniform plating are usually rotated while being plated because it nearly impossible to get the current distribution uniform enough to prevent banding.
A post-plate grind and polish is the only way to get optimal uniformity.
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P.E. Metallurgy, Plymouth Tube