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Anonymous Poster

Aluminum Extrusion

10/21/2008 3:22 PM

I have a simple L-shape extrusion that is currently produced by a supplier. We have need for an additional L-shape extrusion with a shorter length on one of the legs. The supplier has stated that a whole new die is needed. Why wouldnt the supplier be able to use the existing extrusion die by blocking off part of the existing die with a removeable plate that covers part of the leg?

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Guru

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#1

Re: Aluminum Extrusion

10/21/2008 7:44 PM

The forces are simply too high. I suppose a die could be designed to allow the use of a block-off plug, but it would be impractical. 

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Anonymous Poster
#2

Re: Aluminum Extrusion

10/22/2008 1:32 AM

If you are ordering serious qties, the new die cost is next to nothing.

If small qties, consider machining off some of the extra length of the original L.

Do not fiddle with dies. No one does, for good reason.

Best regards

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#3

Re: Aluminum Extrusion

10/22/2008 4:55 AM

Remember that, in aluminium extrusion, the billet is squeezed by a hydraulic ram until the aluminium becomes plastic enough to pass through the die. Can you imagine how much pressure that takes? I don't see how any bolt on adaptor would stand the conditions.

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#4

Re: Aluminum Extrusion

10/22/2008 9:41 AM

Good morning -

as far as tooling for aluminum extrusions go, the die charge (with any volume) for a new die is probably only around $1200 to $1600. You might be better off if the quantity is small working with a someone to trim off a small amount of aluminum and sell the scrap to recover the cost -

Example -

Normal extrusion costs $.80 per foot

Corrected extrusion costs $.68 per foot

Retail value of aluminum difference $.12 per foot

Recovery cost of scrap aluminum est. max 50% or $.06 per foot

Cost to machine off aluminum portion not needed est. $.10 per foot

$.80 extrusion + $.10 fabrication cost -$.06 aluminum recovery = $.84

versus

$.68 and a die charge of guesstimate - $1600

Difference is $.16 per foot - so until you buy 10000 feet ($1600 divided by $.16 per foot savings) it is cheaper to work with someone to fabricate what you need.

Note - The guesstimate for the foot cost on the current extrusion might be somewhat smaller if you go up in total volume - buying the portion that is normal PLUS the portion that you will have fabricated -

Substitute in your own numbers and see what looks best -

Good luck.

Jim

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Anonymous Poster
#5

Re: Aluminum Extrusion

10/22/2008 10:52 AM

Thanks to all of you for the info! Its nice to have a few voices of experience and/or opinion. I had done plastic extrusions with blocking plates before for prototyping, but I was unsure of aluminum. Now I have a better view of things. Man, I love CR4!

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#6

Re: Aluminum Extrusion

10/22/2008 5:04 PM

I would use a table saw with an aluminum cutting blade to rip the extrusion to the proper width, and use plenty of A9 (aluminum cutting fluid). I assume you are using 12 foot lengths (common in the US), and you might need a helper to help guide the aluminum through the saw.

Bill

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Anonymous Poster
#7

Re: Aluminum Extrusion

11/05/2008 11:26 AM

Good Day.

Answer to your question is yes and no.

If you can kindly send your drawing i can let you know can it be done? if yes then what will be losses and what will be profit.or simply making new die is the short and sweet answer.

Sanjay Mandhana

saraswatiextrusions@gmail.com

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