- Joined
- Dec 2, 2016
- Messages
- 270
No not that kind,
We are grinding thread rolls at our shop out of various tool tool steels in a hardened state. Typically DC53 or M2 at a HRC of 59-61. The depth of thread is around 1.5mm. My depth of cut is staggered and heavy on the first passes but goes lighter on the last passes. My Q' number for instance would be 14 on the first pass which is just the tip of the thread radius, down to 5.5 or so on the last pass at full thread engagement. My finish pass can be .0004-.0015 of material. I will encounter some dis-coloration on the first couple of roughing passes but that eventually cleans up on the last 2-3 passes of my roughing cycle.
My question being is there much of a dimensional change when stress relieving a part?
What we see in our failures on our dies are either long deep cracks of the thread or what looks like spalling and deformation on the crests of the die.
Thanks
We are grinding thread rolls at our shop out of various tool tool steels in a hardened state. Typically DC53 or M2 at a HRC of 59-61. The depth of thread is around 1.5mm. My depth of cut is staggered and heavy on the first passes but goes lighter on the last passes. My Q' number for instance would be 14 on the first pass which is just the tip of the thread radius, down to 5.5 or so on the last pass at full thread engagement. My finish pass can be .0004-.0015 of material. I will encounter some dis-coloration on the first couple of roughing passes but that eventually cleans up on the last 2-3 passes of my roughing cycle.
My question being is there much of a dimensional change when stress relieving a part?
What we see in our failures on our dies are either long deep cracks of the thread or what looks like spalling and deformation on the crests of the die.
Thanks
