I need to machine a plate of cold rolled 1018. It's 1/2"x6"x27" and will be machined down to 0.3937" (10mm). Thickness isn't critical, but flatness is kind of critical. It should probably be within +/- 0.005" over the 27" length.
Based on the searching I've done and my experience machining cold rolled stainless, I know (read: assume) that this material is going to warp due to removing internal stresses.
Here's my strategy:
1) Use epoxy to hold the plate to a fixture plate (with minimal stresses due to work holding), and then machine away a little (how much... not sure).
2) Flip the plate over, use epoxy again, and machine a little off the other side.
3) Repeat 1 and 2 until I get close (maybe 0.01") to the final thickness, then switch to a vacuum fixture for the last facing operation.
Does this have a shot of working? How many times would I have to go through 1 and 2? Is there an easier way?
My customer specified that the yield strength should be around 50,000 psi, and is willing to switch steels as long as that constraint is met. I wanted to go with A36 hot rolled (because I assumed with hot rolled I'd have less of a problem, but please let me know if I'm right or not on that) but the yield strength is a bit lower.
Matt
Based on the searching I've done and my experience machining cold rolled stainless, I know (read: assume) that this material is going to warp due to removing internal stresses.
Here's my strategy:
1) Use epoxy to hold the plate to a fixture plate (with minimal stresses due to work holding), and then machine away a little (how much... not sure).
2) Flip the plate over, use epoxy again, and machine a little off the other side.
3) Repeat 1 and 2 until I get close (maybe 0.01") to the final thickness, then switch to a vacuum fixture for the last facing operation.
Does this have a shot of working? How many times would I have to go through 1 and 2? Is there an easier way?
My customer specified that the yield strength should be around 50,000 psi, and is willing to switch steels as long as that constraint is met. I wanted to go with A36 hot rolled (because I assumed with hot rolled I'd have less of a problem, but please let me know if I'm right or not on that) but the yield strength is a bit lower.
Matt