What type of material for die clamps on brake press

jackal · Dec 9, 2021

I have a customer that has a large 8 foot brake press.
Someone took the clamps off that hold the top die in place.
Different sources have said 4140 and one said cold rolled would be fine.
These measure out to be. 2-1/2" x 1-3/4".
What are your opinions on the material?
Thanks in advance.

Milland · Dec 9, 2021

I'd err on the side of toughness and strength, and not cheap out for this application. Having a die drop on a worker could ruin his (and his company's) whole day.

That also means using quality bolts, and not reusing them forever.

I don't know how easy to find it'll be, but maybe a structural steel plate to the standard HPS-70W would work? See the chart on page 27 of this link:

https://www.fhwa.dot.gov/bridge/steel/pubs/hif16002/volume01.pdf

It's got a nice balance of strength and strain capability.

Strostkovy · Dec 9, 2021

The shoulder surface should be softer than the punches in my opinion. I know die rails are typically very soft to not damage the dies if debris gets between the tool and holder.

Woodeye1 · Dec 9, 2021

Do your dies have a milled ‘retainer’ groove in them or are they flat? If they’re flat I always used 4140 and saw cut some diagonal grooves about 1/2” apart maybe 1/8 deep for a little more grip. The grooved type are a lot more forgiving in terms of safety. You can get by with carbon steel for those

Bondo · Dec 9, 2021

Contact the manufacturer. I have a 12' Cincinnati and they are very helpful in information like this.

Or you can contact a die manufacturer and ask them.

Sent from my SM-G960U using Tapatalk

jackal · Dec 9, 2021

Ok. Thanks for the info.

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What type of material for die clamps on brake press

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