Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Largest Manufacturing Technology Community on the Web
Stay Connected:
tonnage to punch red hot steel?
- Thread starter tomjelly
- Start date
- Replies 6
- Views 1,686
sfriedberg
Diamond
- Joined
- Oct 14, 2010
- Location
- Oregon, USA
A useful rule of thumb is that structural steel (low carbon, low alloy) at 800 degrees C (cherry red) has 1/10 the strength of steel at room temperature. Punch tonnage required is proportional to strength, so take any handy calculator and adjust the result accordingly.
blcksmth
Cast Iron
- Joined
- Nov 17, 2006
- Location
- Bowling Green, Ohio
It is relatively easy - not fast - to punch an oval hole for a wood handle in a hammer head made of good carbon steel with a flat faced punch using a hand powered hammer. It is considerably easier, and faster, with the help of a striker using a sledge hammer. A pointed punch will expand the steel where as a flat punch will remove a plug of steel. I confess to having no knowledge of presses, hydraulic or mechanical, so I cannot comment on power required. My guess is that the speed of the punching operation may be more important then the power applied in order to get the job done before the steel cools too much.
Bob
WB8NQW
The Eagle's Anvil
Bob
WB8NQW
The Eagle's Anvil
dave powelson
Cast Iron
- Joined
- Aug 28, 2007
- Location
- Yuba City, CA
.750 ID thru 1.000 thickness...and you're not concerned about the thickness vs. diameter?
Sea Farmer
Diamond
- Joined
- Mar 25, 2006
- Location
- Cape Cod, Massachusetts
Probably not much of an issue if the material is hot enough, and if the punch stays relatively cooler. The compressive strength of the material being punched is greatly reduced at heat.
LKeithR
Stainless
- Joined
- Sep 1, 2011
- Location
- Langley, B.C.
With cold metal it would be an issue--punching it hot should compensate for the smaller hole but I would expect some
distortion. (For those not in the know normal procedure when punching holes is to keep the diameter of the hole equal
to or larger than the material thickness.)
