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Straightening Stainless Steel #4587758
11/28/17 03:57 PM
11/28/17 03:57 PM
Joined: Dec 2009
Posts: 762
Battle Creek, MI
SVTCobra Offline OP
SVTCobra  Offline OP
Joined: Dec 2009
Posts: 762
Battle Creek, MI
Don't belong to hardly any online forums so I'd figured I would ask here in hopes of someone pointing me in the right direction. The company I work for has a die that is made out of stainless that had a nut get pushed through and damaged it. In the past when these were damaged everyone including the manufacturer said it couldn't be fixed due to warping the thin metal when heat is applied. A new die is in the neighborhood of $20k.

This is the first time this happened where I saw it in person so instead of taking everyone's word for it, I wanted to reach out if anyone has any experience in fixing something like this or can point me in the right direction. Seems to me a competent body shop that does restoration work would be a good place to start, but I know stainless is a different animal and really might not be fixable.

I would provide a picture but not able to currently locate it. The basic shape of what I am talking about is a curve with a radius of around 3-4 inches with slots that are about 2.3 mm wide and 150 mm long. The slot is bent and that is what needs to be brought back to a circular shape either through bending and shaping or cutting out the bad piece and welding in a new one.


Think twice, speak once.
Re: Straightening Stainless Steel [Re: SVTCobra] #4587779
11/28/17 04:13 PM
11/28/17 04:13 PM
Joined: Aug 2008
Posts: 3,231
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,231
Where the wind comes sweepin'
I'm sure some here can help, but the Practical Machinist forum is full of guys who spend their days thinking about how to work with metal.. so that's another resource for you.

http://www.practicalmachinist.com/vb/

Re: Straightening Stainless Steel [Re: SVTCobra] #4587784
11/28/17 04:21 PM
11/28/17 04:21 PM
Joined: Jul 2015
Posts: 4,654
Down Under
SR5 Offline
SR5  Offline
Joined: Jul 2015
Posts: 4,654
Down Under
I don't know which alloy you are using, but I have always found stainless steel difficult to work with due to the fact it work hardens.

Bend it once, that's OK, go to adjust the bend and the now work hardened part stays fixed in place while the material around it moves instead. Same with cutting in a band saw, cuts OK, pause for half a second and it becomes hard on the face and difficult to cut. Push through the hard bit and it suddenly takes off again.


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Re: Straightening Stainless Steel [Re: SVTCobra] #4587792
11/28/17 04:32 PM
11/28/17 04:32 PM
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
No cutting and welding, find a good (real good not a bondo hack) that can hammer and dolly it, shrink it then pick and file.
I know a few old timers that can do it around here but in MI There should be a lot of guys able to do that work, time to make some calls.


ASE L1, Master. Deutsch Meisterbrief.
Re: Straightening Stainless Steel [Re: SVTCobra] #4587903
11/28/17 06:33 PM
11/28/17 06:33 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Call Jody, he can fix it. LINK

Re: Straightening Stainless Steel [Re: SVTCobra] #4587938
11/28/17 06:53 PM
11/28/17 06:53 PM
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
Try "Unique Machine & Tool" in Mc Kees Rocks PA 15136 Phone number 412 331 2717 ask for Martin Rubeo he is the owner and a top notch metal machining and welding man.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Straightening Stainless Steel [Re: SVTCobra] #4588012
11/28/17 07:26 PM
11/28/17 07:26 PM
Joined: Dec 2009
Posts: 762
Battle Creek, MI
SVTCobra Offline OP
SVTCobra  Offline OP
Joined: Dec 2009
Posts: 762
Battle Creek, MI
Thanks to everyone for their replies. I will look into it. Just to clarify this is either a 314 or 304 stainless used for food production. It's located in Kentucky. The local machine shop hasn't been able to fix this in the past, so worth a shot to send it to a body man or another machine shop instead of buying a new one.


Think twice, speak once.
Re: Straightening Stainless Steel [Re: SVTCobra] #4588093
11/28/17 08:25 PM
11/28/17 08:25 PM
Joined: Feb 2013
Posts: 1,112
Prospect, KY
spk2000 Offline
spk2000  Offline
Joined: Feb 2013
Posts: 1,112
Prospect, KY
Based on description I am reading I have seen others weld into the damaged zone where the nut pushed through then machine excess away. Kind of like filling a tooth cavity but it's metal then remove the excess. I am not a machinist or die maker though just what I have seen.


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Re: Straightening Stainless Steel [Re: SVTCobra] #4588138
11/28/17 09:07 PM
11/28/17 09:07 PM
Joined: Jun 2002
Posts: 12,642
The Motor City
Kestas Online content
Kestas  Online Content
Joined: Jun 2002
Posts: 12,642
The Motor City
That sounds like a good way to repair it. I'm away from my books, so I can't recommend a filler metal. A good welder should know. Maybe pure nickel?

Does the die see appreciable stress, or does it just take up space?

Re: Straightening Stainless Steel [Re: SVTCobra] #4588418
11/29/17 06:55 AM
11/29/17 06:55 AM
Joined: Dec 2009
Posts: 762
Battle Creek, MI
SVTCobra Offline OP
SVTCobra  Offline OP
Joined: Dec 2009
Posts: 762
Battle Creek, MI
It mainly takes up space. It's a solid chunk of stainless that is thick where it's bolted to the rest of the machine and where the food is pushed through the die is where it's thin and has the damaged slot.


Think twice, speak once.
Re: Straightening Stainless Steel [Re: Kestas] #4590348
11/30/17 08:18 PM
11/30/17 08:18 PM
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
Originally Posted By: Kestas
That sounds like a good way to repair it. I'm away from my books, so I can't recommend a filler metal. A good welder should know. Maybe pure nickel?

Does the die see appreciable stress, or does it just take up space?


Nickel is toxic and can not be used in anything that comes in contact with food. The OP said that this item is for use with food.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Straightening Stainless Steel [Re: SVTCobra] #4590353
11/30/17 08:21 PM
11/30/17 08:21 PM
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
BTW some stainless has nickle, and some does not. To find out see if the stainless will stick to a magnet. If it sticks to a magnet it does not have nickle. If it does not stick to a magnet it has nickle and should not be used in anything that comes in contact with food.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Straightening Stainless Steel [Re: SVTCobra] #4590375
11/30/17 08:42 PM
11/30/17 08:42 PM
Joined: Jan 2009
Posts: 13,975
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,975
Illinois
408 stainless will take to a magnet because of carbon and it does have some nickel. All of the food grade stainless that I have welded for companies, required 316L tig rod.


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Re: Straightening Stainless Steel [Re: tig1] #4591308
12/01/17 05:49 PM
12/01/17 05:49 PM
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,920
Pittsburgh,PA U.S.A.
Originally Posted By: tig1
408 stainless will take to a magnet because of carbon and it does have some nickel. All of the food grade stainless that I have welded for companies, required 316L tig rod.


Interesting info about 408 stainless. I thought that the magnet test was good enough to check if a stainless steel pan was nickle free, now I know better. I have seen some stainless steel pans that a magnet will not stick to at a local second hand thrift store. Not all manufacturers that make stainless pans use nickle free stainless.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa


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