Testing Slide Adjusting Plungers for an adjustable clamp assembly handle.
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- เผยแพร่เมื่อ 17 ต.ค. 2016
- A quick video showing the simple testing procedures done for the slide adjusting plungers we produce for some adjustable clamp assemblies we manufacture. Parts are fully inspected for dimensional tolerance, but it is the thread engagement after heat treat that is causing failure issues. Before heat treat, there are no issues with thread engagement at all. Material = 440C Ultra-Hard Wear-Resistant Stainless Steel. Plungers are heat treated to Rc 52-62. All components are manufactured by Crosby Machine Company, Inc. at our facility in West Brookfield, Massachusetts.
I suppose you have tried machining them in the hardened state ? Or send them out semi-finished and do a cleanup after heat treating ?
We are considering that now. This time around we are going for a lower Rc to see how they react. We have made these for a couple years now, and the scrap rate is high, but for some reason this last batch was off the charts! We're sending some out and having different lots heat treated to different spec.'s to see if we can find the best Rc amount with the least distortion. The last batch came back Rc 57. Very frustrating to test and pass 100% before heat treat, and a crap shoot afterwards.
I can see only two ways the last batch was so bad compared to the earlier ones: Different metal composition than before, or the heat treatment was done differently. Hope you figure out a way to make it work!