Machine Shop claims they can't mill my part, hardened steel mold die, help!
Hello,
Introduction:
I am new here, I am an Engineering student, and I am developing a product for a start up company, and have an interest in machining and I do simple conventional stuff myself as well as some diy CNC, nothing complicated though.
My project:
I need to modify an existing injection mold die, it is over 10 years old and made outside the U.S. It was originally pre-hardened, EDM machined, and coated with TiN. It is extremely expensive, which is why I would rather modify it than have it remade. I need pockets milled into the mold to accept inserts. The mold die was hardened to accept high volume production, it no longer needs to serve that purpose, I only need it for low volume production. For this reason the TiN can be removed and it really won't matter at all.
My Problem:
I have been developing this product for months, and it would be ready to go in about 2 weeks, and all that had to be done was modification of the mold die, I had the machine shop lined up, Purchase order issued. However, when I went to deliver the mold die, they asked if it was hardened (the answer is yes) then they said it would not be possible to machine. It is likely a hardened tool steel (maybe A2, I have no idea since I have no documentation on the mold die) and it is probably around 60 HRC. Does anyone know if it is possible to machine this steel, or is it truly a lost cause? I thought it was possible to machine hardened metals, but I could be wrong? Do I have to turn to EDM? I wanted to avoid EDM due to cost. I would appreciate any advice!
Thanks!
Re: Machine Shop claims they can't mill my part, hardened steel mold die, help!
i know this thread is old but, out of all the machinists here nobody chimed in and said a d2 mold can be machined? I machine hard d2 all day long everyday, and thats at 60-61rc. a2 is even easier.
Re: Machine Shop claims they can't mill my part, hardened steel mold die, help!
Really hard to say with the picture. Are the mold surfaces on a visible part of the end product? If you can live without the TiN coating sinker EDM a hole, wire EDM out a 'peanut' and bolt on a new block for machining. I've never worked with TiN coating but if it flakes a bit and there is a new seam does it matter??? I'm not an expert injection mold maker. Most of my molds are wax investment and everytime we have a chance to make a mold more difficult (aka goof up) I will cut a plug and machine the bad area.
Re: Machine Shop claims they can't mill my part, hardened steel mold die, help!
Hi how many pieces are you Intend to Produce ? I guess for a Start remill the Part in 3 d at a Friends machine or happylab or similar because if your Production is New it is likely that you Need to adjust it ,..
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Re: Machine Shop claims they can't mill my part, hardened steel mold die, help!
Hi,
You are right, machining was no problem. I ended up getting a Haas mini mill (was cheaper than sending to mold shop as a long term investment), and just machined it myself, (granted there was a substantial learning curve). I called OSG and told them what I wanted to do, and they helped me pick some high helix angle carbide EM's to avoid deflection. Also used shrink fit EM holders, cut through that hard steel effortlessly! When it was all done, I was able to hold tolerances of +/-2.5 microns, or "One Tenth". Good enough for me.
Re: Machine Shop claims they can't mill my part, hardened steel mold die, help!
More that likely it was case hardened only, so once you cut thru the rest should be no problem..Good luck.