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Power-User

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Stamping Thin Metallic Sheet

09/07/2011 12:23 PM

I sent to make some pieces to some workshop specialized in stamping or punched pieces. It is a metallic (SS316l) ring with a "U" shape (wall thickness=0,1mm=.004"). Medium diameter rounds 10mm (.04"). Curve radius of "U"=1mm(=.4"). I paid a half in advance. Now he called me to give me back the money because he failed because the material is so thin and gets broken, then he offered me me keep working on without warranties of succes. I asked him keep on working under my responsability and cost of the advanced money. Any help please..

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Guru

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#1

Re: Stamping Thin Metallic Sheet

09/07/2011 3:52 PM

Do you have a job now? I thought you were a student.

Describe the present tooling and the process involved. No sense in re-inventing the wheel by suggesting things they've already tried.

Then, we may be able to help.

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Power-User

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#4
In reply to #1

Re: Stamping Thin Metallic Sheet

09/07/2011 7:26 PM

I don't have any idea what they did until now but i know in none of workshops i tried worked with so thin SS sheet (in fact is not common size).The whole technic is new for me and nothing seems exact or predictible.I am not student but you made me feel much younger,i'll try keep learning as one.

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Guru
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#2

Re: Stamping Thin Metallic Sheet

09/07/2011 4:46 PM

I wish we were sitting at a table and you could explain in detail what it is you are after.

It sounds like you are trying to recreate something that others make and because their product is too expensive you are trying to make it cheaper and are asking us how to do it.

Do you have an image of the thing you are trying to make? Or a drawing?

metallic (ss 316l) ring with a "U" shape (wall thickness=0,1mm=.004"

A ring is created when the length of the pipe reaches its thickness. After that it becomes a washer.

Maybe "U" shaped wedding rings?

Please explain, no rush, Ky.

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Power-User

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#7
In reply to #2

Re: Stamping Thin Metallic Sheet

09/07/2011 7:33 PM

I would like too meet with you guys and share more than we use to.This don't exists in the market and i am trying to manufacture it.Is not a secret,in fact long time ago i exposed the idea of toroidal dynamic joint: piston plus metallic seal: the thread was not very popular,perhaps coupple posts..Hope pictures downhere helps..

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Power-User

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#3

Re: Stamping Thin Metallic Sheet

09/07/2011 7:15 PM
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Guru

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#5
In reply to #3

Re: Stamping Thin Metallic Sheet

09/07/2011 7:28 PM

You can't form this from a sheet. You will have to first cut out a washer of the proper dimensions.

Then, form it over a male tool. Wrinkles will always be a problem.

Once again, what has been done so far?

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Power-User

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#8
In reply to #5

Re: Stamping Thin Metallic Sheet

09/07/2011 7:39 PM

Next days i'll contact them again,for now:they cut washers as you said and now they will try cutting dishes first and then will cut the interior.Of course they made the male etc.but seems don't work..

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Guru
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#9
In reply to #8

Re: Stamping Thin Metallic Sheet

09/07/2011 7:48 PM

Heat might help but those dimensions are flimsy.

I have one of these in my hands. They would know all about it or could at least point you in the right direction.

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Guru
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#6
In reply to #3

Re: Stamping Thin Metallic Sheet

09/07/2011 7:32 PM

http://www.ldm-tuning.de/en/artikel-7234.htm

Maybe these guys can help. Thanks for the drawing. What is it for?

Good luck, Ky.

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#10

Re: Stamping Thin Metallic Sheet

09/11/2011 1:37 AM

use plenty of water solutable lubricate.

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Power-User

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#11

Re: Stamping Thin Metallic Sheet

09/29/2011 9:14 AM

This is the best they could do...Shorter internal lip.

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Guru

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#12
In reply to #11

Re: Stamping Thin Metallic Sheet

12/23/2011 11:52 AM

Was the stainless that you provided annealed? 316L can be deep drawn or formed without much difficulty. However, it does work harden. So question is was it annealled after the last cold working step performed on the metal? (In other words if it was cold drolled to final thickness was it annealled? If not, that may be a potential cause of the forming difficulties.

Is the tooling making this in one hit? Or more? Again, work hardening. Work hardening, work hardening.

Typical % elongation for this material as annealed is 69%; 42% as annealed and cold drawn 9 %. Calculate the max elongation of the part in the press and compare.

Milo

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#13
In reply to #12

Re: Stamping Thin Metallic Sheet

12/23/2011 5:09 PM

Thanks a lot for your reply Milo.Is now an old thread of a design i quit for now (with defeat taste in my mouth).The workshop didn't "hits" literally, they used a hydraulic (so slow) tool and press the sample.the material used was provided by me, i think raw.They made these tests:i) cut dishes and press (one"hit"), ii) cut dishes with a hole before press, iii) and iv) same cases before but with a profile more "squared", less depth.I saw several pages about drawing (i didn't get anything) in internet where means, could be previously stated if work can be done or not and a way to, but the workshop on the contrary says is a question of several attemps.In some pages theory uses total surface don't change after drawing, in others volume don't.I made a lot of work thinking it would be easy and was a dissapointment to me.I said to myself ask Milo when i read your article.I'll consider your comments here when i face again this manufacture.Thanks again.-

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Guru

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#14
In reply to #13

Re: Stamping Thin Metallic Sheet

12/23/2011 5:43 PM

You're welcome. Milo

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Users who posted comments:

Anonymous Poster (1); ferquiza (6); ky (3); lyn (2); Milo (2)

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