Help with heat treating 52100
Help with heat treating 52100
(OP)
I need some help in regards to heat treating a camshaft of 52100.
- Currently we start with a round 2" billet, its roughly 6.5" long.
- Its rough machined, down to an effective diameter of about 1.25", with an eccentric lobe in the center (hence the 2" bar material). 0.020" is left on all ground surfaces.
- Part is heat treated to HRC60
This is where the problem occurs as the part moves all over the place. Hence the 0.020" left on all ground surfaces.
The heat treating company uses a oil quench.
Any ideas on how to prevent the movement.
- Currently we start with a round 2" billet, its roughly 6.5" long.
- Its rough machined, down to an effective diameter of about 1.25", with an eccentric lobe in the center (hence the 2" bar material). 0.020" is left on all ground surfaces.
- Part is heat treated to HRC60
This is where the problem occurs as the part moves all over the place. Hence the 0.020" left on all ground surfaces.
The heat treating company uses a oil quench.
Any ideas on how to prevent the movement.





RE: Help with heat treating 52100
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Help with heat treating 52100
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Help with heat treating 52100
rp
RE: Help with heat treating 52100
The part is hung vertically when heat treated in oil at 160°.
Have heard a few comments about having it stress relived, the recommended process was,
Rough Turn with .125" of dimensions
Stress Relieve
2nd Operation rough turn within .010" of dimensions
Heat Treat to HRC
Finish grind
Another recommendation was to use oil at 300°F, and another recommendation was to use a vacuum heat treat.
RE: Help with heat treating 52100
Vacuum heat treating by itself will not have a meaningful effect on distortion. The reason it was mentioned is because many vacuum furnaces use high pressure gas quenching instead of conventional oil quenching. HPGQ has a reduced cooling rate and therefore tends to reduce distortion.