Some P/M parts require high dimensional accuracy (0.5 mm and sometimes 0.015 mm). This accuracy is achieved by calibrating the part! But for a large batch of parts, calibration raises the cost of the parts (an additional operation). There is also a tendency to remove calibration presses from sales catalogs. What do you think, that getting into the size can be done by controlling the process of sintering and pressing, without calibration?
P. S. I think this is possible when using a combination of: a very stable powder (or with an accurately known shrinkage up to 0.0xxx%) + an accurate press block + an accurate (without gaps) die.
Serhii
You have not said what you are measuring, internal or external diameter or length, or width of the part. I used to work in PM fabrication as a Plant Metallurgist, producing hundreds and thousands of bearings, gears, and so on for autos, washing machines, and many more. Thus, let me know.
Dr. K
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