6ballchucks
Plastic
- Joined
- Feb 20, 2012
- Location
- Marion, IA U.S.A.
Hello Folks,
I am having a repeating issue come up with some of the products coming from our heat treat department to our grind and assembly department. I have a tough time believing even with my somewhat small but growing knowledge of heat treat that this perticular thing is happening but it seems to be the root of all that is scrap in our shop.
We are having parts come out of our lathe department and sometimes off the mill and after passing through heat treat and arriving at our grind and hone dept. they are then measured and found to be a few thousandths out of print. Most often its small but occasionally its big, the CNC guys are trying to convince everyone they are "shrinking" in heat treat (and growing when necessary) and that is why they are all small.
My question is does anyone out there have anything other than their past experience that can show me so I can show to those folks here what the average "shrinkage" or "growth" of a part is after being heat treated and hardened?
I have accepted distortion of the part as a reason before but have a hard time believing I can heat a part up to 1600 degrees+ and have it shrink.
I appreciate any feedback even if it is just examples of personal experience
Adam
I am having a repeating issue come up with some of the products coming from our heat treat department to our grind and assembly department. I have a tough time believing even with my somewhat small but growing knowledge of heat treat that this perticular thing is happening but it seems to be the root of all that is scrap in our shop.
We are having parts come out of our lathe department and sometimes off the mill and after passing through heat treat and arriving at our grind and hone dept. they are then measured and found to be a few thousandths out of print. Most often its small but occasionally its big, the CNC guys are trying to convince everyone they are "shrinking" in heat treat (and growing when necessary) and that is why they are all small.
My question is does anyone out there have anything other than their past experience that can show me so I can show to those folks here what the average "shrinkage" or "growth" of a part is after being heat treated and hardened?
I have accepted distortion of the part as a reason before but have a hard time believing I can heat a part up to 1600 degrees+ and have it shrink.
I appreciate any feedback even if it is just examples of personal experience
Adam