The Future Tooling-Talent Pool: Misperceptions Demand Attention: Joe Brown
A Split Decision: Peter Ulintz
Tooling Costs Compared—Offshore vs. On: Bob Quinn
Value-Added Operations, Part 1—Putting Stuff Together: Drew Stevens
and from Danny Schaeffler of Engineering Quality Solutions (EQS)...
Limitations of Hardness Testing for Deep-Drawing Applications (or, How to Make a Good Impression)
You’ve probably noticed that hardness is sometimes reported on your sheetmetal certs (and that if you see it, you likely are paying for it, probably a few dollars per ton). If you form mild-steel sheet in the range of 0.060-in. thick, hardness probably will fall near 75-78 HRB. But what does this really mean?
Simply put, hardness provides a measure of the material’s resistance to indentation. Of course, hardness will vary with the type of material being tested. But the test results also depend on the type of indenter being used (size/shape/material) and the amount of force used to push the indenter into the sheet. These two test parameters determine the scale used by the testing facility when reporting test results ...
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