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Possibility of using hardness testing as a way to determine the amount of cold rolling in our 60-40 brass sheetsWe started with a sample bar where we determined the dimensions using a dial caliper and measured the hardness using a hardness tester We then cold-rolled the bar in small increments using a rolling mill taking the same measurements after we had completed approximately 5 cold work All of this data is on the attached sheetResults were as expected Hardness appeared to generally increase as cold work was done see attached graph There was a small error in the experiment the hardness does seem to decrease at about 15 - this is probably due to measurement error as the general trend should be valid throughout the experimentMy view on the situation is that we should not change our procedures at this point in time There are too many problems with this type of testing As you can see by the graph I do not believe that the numbers we came up with are accurate enough that we can fully trust them ie the dip in the graph at 15 Also there is not enough variance in the results that we can determine with much accuracy how close we are to our allowed cold-rolling specifications This also is not the most efficient test in terms of loss of material This procedure calls for the deformation of material that could be used to make products I think that there are better ways to test for amount of cold-rolling in our materials
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