×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Help with heat treating 52100

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.


 

RE: Help with heat treating 52100

Have you tried stress relieving it prior to the rough machining?

----------------------------------------

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

Agree with dgallup,remove the machining stresses,post,rough machining. Oil quenching is commonly adopted quenchant.

_____________________________________
"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

In addition to the stress relieving suggested, you may also need to hang the part vertically for quenching.

rp

RE: Help with heat treating 52100

(OP)
So the material would come in as rolled.  So it could annealed.....

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

Hot oil quenching is one way to minimize distortion during the quenching process.  It requires a high flash point oil, and only some heat treaters offer it, but it is a well-understood process with definite benefits.

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.

 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources