Tool steel 1.2379 or 1.2842 for bending stress on dies 1

[LCform]

Hi all

Which of the above mentioned tool steels are better for cold formimg dies that will be under bending stress? The bending stress is caused by a punch that leans on a part of lower die to deform the piece. What would be the considerations in heat treatment of both?

 

[EdStainless]

If your punch has any lateral loads in it then you need to redesign you tooling.
All forming tooling is a balance between toughness and wear resistance.
You need a good handbook on tool steels that compares properties and various heat treatments.

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P.E. Metallurgy, Plymouth Tube

 

[LCform]

well I have a handbook, but the charts are not always the same, for the 1.2482 there's a chart that indicates the hardenability%/deformability% while the other doesn't have. in this tooling there has to be a side loading, unavoidably. I just wanted to know which one will perform better. could you please elaborate ?

 

[Screwman1]

You are going to have to select a high toughness steel and then temper it to a lower than normal hardness to get something that will hold up to any sort of lateral loading without breaking off. One of the shock resisting steels might be a good place to start.

 

[LCform]

Which steels are shock resisting for high speed cold forming ?

 

[LCform]

And please someone explain me please about the EDstainless comment , it is vital for me to know

"
If your punch has any lateral loads in it then you need to redesign you tooling.
All forming tooling is a balance between toughness and wear resistance.
You need a good handbook on tool steels that compares properties and various heat treatments.

"

and please introduce me some great tool steel handbooks

 

[Maui]

CPM 3V is hard to beat when it comes to finding an alloy with an excellent combination of toughness and wear resistance. It is often used for cold forming dies. You can read about it here:

https://www.crucible.com/eselector/prodbyapp/tooldie/cpm3vt.html

Or if you need even better toughness, CPM 1V would be an excellent alternative choice:

https://customer.cartech.com/assets/documents/datasheets/cpm.pdf

Both grades are currently manufactured by Latrobe steel, a subdivision of Carpenter Technologies.

Maui

 

[EdStainless]

CPM 3V would be a very good option for this service.
If you want to stick with a conventional tool steel then select one for toughness such as H13, S7, or L6 and then use a surface treatment (nitrocarburize) if you need better wear resistance.

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P.E. Metallurgy, Plymouth Tube