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Pre-Paint Roughness Standard for Scratches in Carbon Steel prior to Painting

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J

JAltmann

#13
#13
While i am knowledgeable in surface texture, i do not have a good answer for how to "uniformly" create the test samples you desire. I would think that any scratch that can be detected by fingernail would need to be blended smooth.

Using the profilometer can give you varied results depending on what type and how it is used. Looking at Ra would not tell you 1 scratch is bad as it is and average reading, typically over 5 sample lengths. RzMax would give you max depth, but in my opinion checking the parts with a profilometer is overkill and non-value added.
 
B

Bigfoot

#14
#14
joetech71 said:
133 views and only two replies, guess I'm on my own on this one.
Click to expand...
No, You aren't on your own. Establishing robust guidelines for the visual inspection of steel can be a very trying ordeal. We have developed a grading system that we apply to HR material that we use as part of the training process for all operators throughout the company. I've attached a pdf file that shows how we score / grade & record these defects in our processing of the coils. Cold Rolled is somewhat different as the Customers are typically looking for a much improved surface so many of the defects we have identified in the HR are not likely to be evident. Have you asked the Customer to see if they have set some kind of acceptance standards for this beyond the "0" defects mantra?
 

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S

Sturmkind

#15
#15
Hi, Joe!

If you are using flat coupons that are relatively thin, a hardened steel scribe can be affixed to the spindle of 0-2" micrometer to accurately control the depth. To stabilize the spindle side and mitigate additional marks a plastic delrin 'shoe' with center clearance and either to side 'rails' or (3) dimple skids is machined and affixed to the micrometer body.

Another mechanical option would be a scribe on a vertical height gage and a clamped bar against which it rides that could then be incrementally advanced toward the coupon held vertically in an anchored machinist's vise.

If a lathe or Bridgeport® Mill is available, the coupon could be held in a 4-jaw chuck and the micrometer lathe advance with a scribe tool set in the tool block could be used.

Most automotive appearance defect standards set a maximum length (5mm) and width of pre-paint scratch.

I hope this helps!
 
S

Sturmkind

#16
#16
One other thought that I have found frequently overlooked is the existence and audit of a graphic anti-mutilation policy that requires that exposed rivets on jeans be taped over, rings, watches, jewelry, and other potential sources of personal abrasion are covered, and so forth.

I recall a supplier of class 'A' surfaces whose shop foreman had a huge keychain affixed to his belt. When the keys were pocketed and the anti-mutilation was in effect with daily audits, the pre-plate / pre-paint scratches dropped by 93%. :D
 
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