Sources of Potential Measurement Variation for Brinell Hardness Test

J

jaku76

#1
Greetings,

I was wondering if anybody out there has done any FMEA for hardness testing on forging equipments?

I have been seeing heaps of problem with hrdness test results for my project. 10- 20 HBW points off , in-house compared to forgers.

BTW, we're using brinell method - bridge type
 
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#2
Re: Wanted - Process FMEA for Brinell Hardness Test

This is a rather specialized request limited by both the industry and the fact that few companies perform FMEAs on their measurement processes (though it is a good idea), so you may not receive a quick response.

Have you started with the basics?


  • Calibration or verification on a test block? Microscopic inspection of ball for damage?
  • Non-replicable (nested) MSA on the measurement device?
  • Inter-laboratory tests between you and your forger analyzed using Youden plot, Iso-plot or Bland Altman Plot?
If you do not receive a response on the FMEA, we can move this thread to the MSA forum.
 
Last edited:
B

bazzle - 2012

#3
Re: Wanted - Process FMEA for Brinell Hardness Test

For Brinell I use a test piece that I take to the foundry as a Calibration/Test sample.
It can just be a sample casting rough ground.

Ensure you are both using the same size ball, measuring scope etc etc.

Bazzle
 
B

brahmaiah

#4
Re: Wanted - Process FMEA for Brinell Hardness Test

For Brinell I use a test piece that I take to the foundry as a Calibration/Test sample.
It can just be a sample casting rough ground.

Ensure you are both using the same size ball, measuring scope etc etc.

Bazzle
Using same size ball solves half the problem.But using same machine is desirable. It is safe to follow ASTM procedure.
V.J.Brahmaiah
 
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