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How to create this shape in sheet metal
Hello all, my first post here so please be gentle!!
I've got this shape in aluminium I need to make. It's approx 500mm high, those bends are approx 30mm radius, Aluminium say 2-3mm think. My local metal fabricators said "we can't bend to that shape". Now in the final production item it will be an aluminium extrusion but for the proto I haven't got the budget to do a trail run extrusion just for this shape. S0 it's not production that will be the problem; it's prototyping it. What I'm wondering is why they can't bent to that shape? Is it because they specifically don't have a machine that will do it or is it not possible for any fabricator to make this shape? Any help or idea on how I can create this would be much appreciated.
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Marco Mechanical Design Engineer. |
#2
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bending
No reason that shape can't be formed on a press brake, with the right tooling. I suspect they lack the tooling. If you are using hardened Aluminum, spring back will have to be accounted for.
An English wheel with a go-cart tire can get you most of the way. Force it around a pipe to finish.
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Bill Funk |
#3
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The first thing I thought of is a Gene Winfield pipe anvil.
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Eugene |
#4
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Marco Build a down and dirty version of one of these brakes in this link. You should be able to make something out of scrap laying around. https://www.mittlerbros.com/mittler-...us-brakes.html
I have a question for you? What does a mechanical design engineer do? I would of thought that a mechanical design engineer would be well versed in all of the machines and mechanics to build anything that you could think up to design. When I am building something I am always thinking about what i will build it out of and with what.
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Mark |
#5
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Most shops have a large press brake that cannot close in the part as you have designed it. If you are willing to have it made in two halves, they can probably do it. To make that part, you will have to bend it around a tube and have a way of opening the tool to remove the completed part. It should not be that difficult to put together something to do that. Your part can be built, it is just not something that is done with standard shop brakes. What are your dimensions? You might. E able to fit it into a roller.
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Jacob Hunsinger Shrinking using a stump: https://www.youtube.com/watch?v=-HAFndATFo4&t=7s Making a reverse using a stump: https://www.youtube.com/watch?v=7PlF1BoMCQI Circular Truss E-Wheel http://allmetalshaping.com/showthread.php?t=15419 |
#6
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Quote:
I had a need to form a similar part some years ago, so I built a machine like Mark suggests. So I can attest to the thinking it can do it. Mine comes apart so getting the part out would be possible. And too, figuring out the workings of the machine was a bit of fun. As was building it. You'll have to pre determine the springback on the chosen material before choosing the die diameter. Ron Covell did a recent video on how to do that.
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Bob |
#7
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Is welding out of the question?
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Richard "I know nothing. I from Barcelona" (Manuel - Fawlty Towers) Link to our racecar project https://www.facebook.com/pages/Elan-...ab=public&view |
#8
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A magnetic brake will do the job.
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Sum Tu |
#9
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A magnetic brake will do the job.
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Joe Hartson There is more than one way to go to town and they are all correct. |
#10
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Hey Joe The part he needs has about a 20 inch long bend in 1/8 inch aluminum. Is the magnet strong enough to hold that tube down to bend that thick of aluminum? I have never played with that kind of brake. I assume if the clamp bar has enough mass and surface area the magnet could clamp with a lot of pressure. After looking at it again is there a flat plate with a tube attached to it ?
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Mark Last edited by mastuart; 07-09-2021 at 11:00 AM. |
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