Tuesday, March 14, 2017

Ingot Stripping Crane

Ingot trains would deliver ingots still in the molds that helped create the ingot. A special stripper crane in the rolling mill would remove the mold from the ingot.
John Abbott posted
600 ton stripper crane
That is a big crane. Most of the big overhead cranes we see in erecting shops seem to be around 200 ton capacity. I wonder what holds down the ingot if the mold needs to be pulled up with 600 tons of force. The mold doesn't weight near that amount. Doing a Google search with "ingot stripping crane" made it more confusing because I came across the following image of a 4-ton crane doing the job. But when I noticed the man standing on the floor near the right side, I realized the above ingots are a lot bigger than the ones below.

Stripping the moulds from ingots.
Moulds were stripped in sequence with the teeming operations roughly 20 minutes after casting. Special lifting arms on the 4 ton capacity stripper crane would engage lugs on the ingot mould and strip it off the ingot. Ingot teeming and stripping took place in the same bay. When completed, the ingot cars would be hauled by locomotive outside, and then alongside the stripping bay to the soaking pit bay.
You can see the crane operator in the cab of the stripper crane just behind the two lamp reflectors.
The above is part of a "tour" of making steel rails. The tour starts here. You can tell it is a British mill because of the words like "wagon" for freight car and "sleeper" for tie. This operation shutdown in the early 1980s. Since it was making ingots instead of using continuous casting, I assume it was an obsolete plant.

But this picture does show the stripping cranes can be rather big. Note that DES makes a lot of other heavy manufacturing equipment and that it is in China.

5. 45' MILL INGOT STRIPPER CRANE, WITH STEELWORKER FOR SCALE. - U.S. Steel Homestead Works, 45" Plate Mill, Along Monongahela River, Homestead, Allegheny County, PA
Mike Kieltyka commented on a posting
Crane stripping ingot mold off hot ingot at South Works.
There were so many steel mills on the southeast side of Chicago that there was a company that specialized in storing them.

Tony Margis posted two photos.
John Orlando Molds from Valley Mold. Next to Interlake I think.

Bob Green Valley Mold use to pile the ingot mold like that. Trouble was, they piled it too close to the railroad tracks. The ladle would rub up against them as I delivered iron from Interlake Steel.



(new window)  This video starts with stripping the ingot molds.