Fly press / stamping machine
Fly press / stamping machine
(OP)
Hi,
I have some 0.2mm (0.008 inch) thick stainless steel that I want pressed or stamped flat. It is flatish now but I want it 100% flat. The parts are just 3cm / 1 inch diameter and I don't want to send them out to be done. I want to buy a cheapish fly press or stamping machine. What would you recommend? I mean how much press do I need to get 0.2mm stainless 100% flat? I don't want to spend more than £200, $300 unless I have to. And how much is the thickness going to change?
Regards,
Ant.
I have some 0.2mm (0.008 inch) thick stainless steel that I want pressed or stamped flat. It is flatish now but I want it 100% flat. The parts are just 3cm / 1 inch diameter and I don't want to send them out to be done. I want to buy a cheapish fly press or stamping machine. What would you recommend? I mean how much press do I need to get 0.2mm stainless 100% flat? I don't want to spend more than £200, $300 unless I have to. And how much is the thickness going to change?
Regards,
Ant.
RE: Fly press / stamping machine
RE: Fly press / stamping machine
Regards,
Ant.
RE: Fly press / stamping machine
How flat is flat?? There are actually methods for describing "flatness"
RE: Fly press / stamping machine
RE: Fly press / stamping machine
RE: Fly press / stamping machine
RE: Fly press / stamping machine
RE: Fly press / stamping machine
RE: Fly press / stamping machine
Belay that.
If you can _find_ some old telephone relays, examine them.
You may find that the parts that have to be flat have been planished, i.e. pressed between flat dies whose faces are covered with arrays of small pyramidal teeth. The resulting pseudoplanar surfaces are obviously not optically flat, but they are mechanically flat.
You can buy aluminum sheets that have been 'stretcher leveled', or basically stretched in two dimensions until they begin to yield. I do not know if the stretcher leveling process would work on stainless steel; since I have never seen such sheet offered, I suspect not.
My theory is that planishing effectively performs stretcher leveling on a macro level, between the pyramids. Maybe it could work on stainless. You would probably need carbide dies, but if your workpieces are not large, the dies need not by hugely expensive. I don't know if planished surfaces would work in your application; only you can answer that.
Recent Trumpf CNC punch presses can be had with a marking head, that probably could planish parts like yours, one impression at a time (more rapidly than you can imagine) before blanking them. It might be worth a try.
Mike Halloran
Pembroke Pines, FL, USA
RE: Fly press / stamping machine
I could buy a roller and get it into what I thought was flat but it probably still wouldn't be. A mammoth industrial press would presumably leave it a bit flatter but it'd still spring back to not quite flat. I will read up about planishing. Hmmmm.
RE: Fly press / stamping machine
If the parts were cut out with a punch and die, they are likely to have a slight bow or dome from the punching process. To get them flat you have to stress relieve the part by stretching around the edge of the part.
Whilst a fly press can do this, it is hard on a hand operated press to control the pressure from stroke to stroke.
( As an apprentice I spent many an unhappy hour on one of these fiendish devices.) you would be better off limiting the travel against a hard stop.
A small hydraulic press that you can press to a known pressure will give you better results, for what you are doing 10 tons should be enough.You can buy one of these for about 140 Pounds Sterling
Also you only need pressure on the edge of the part, if you give it too much stretch on the periphery then the part will warp with a floppy edge, not enough and you still have the dome.
Good luck with this,
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Fly press / stamping machine
RE: Fly press / stamping machine
RE: Fly press / stamping machine
Just to be sure we are talking the same loads your tonne is 2204.62 lbs, correct?
That should be more than enough to straighten your discs.The rest will depend on your tooling.
If they are lazer cut you will still have a small heat affected zone around the periphery.
You should not need as much straightening effort as with a punched blank.
Remember at this point you are hand straightening these parts, while the basic principles are as I described in my first post, this is still very much a trial and error process.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Fly press / stamping machine
http://www.ebay.co.uk/itm/200647032212?ssPageName=...
I can imagine I'll make a few mistake, at some point further down the line I'll also need to coin these parts with a punch of some description. It looks like this will be the right equipment, i'll just have to chuck some away! Thanks, Ant.
RE: Fly press / stamping machine
I was thinking something more like this, you can get this style in 20 tonne also but they are over 200 Pounds stirling.
http://www.ebay.co.uk/itm/BENCH-PRESS-10-TON-CAP-H...
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Fly press / stamping machine
RE: Fly press / stamping machine
RE: Fly press / stamping machine
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Fly press / stamping machine
RE: Fly press / stamping machine
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Plymouth Tube
RE: Fly press / stamping machine
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Fly press / stamping machine
Look into "coining" - the US Mint does a pretty good job of this....
RE: Fly press / stamping machine
I would still try to lap them, you will get flatness better than you can measure and there is no tooling, just machining costs. Very low stress process also.
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Plymouth Tube
RE: Fly press / stamping machine
RE: Fly press / stamping machine
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Plymouth Tube
RE: Fly press / stamping machine
Mike Halloran
Pembroke Pines, FL, USA