Harry Klever
Member
What was it, and when was it invented and how deep did it go into the steel etc?
- Thread starter Harry Klever
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Janicholson
Well-known Member
In 1938 the Elotherm company in Germany began the process. Induction hardening has been a mainstay of metal processing for many years. From melt furnaces, to silver soldering, it is common.
There are many other methods of hardening journals. Plasma spray, and flame processes are two. Jim
From their Website: DEW launches R&D activities on induction crankshaft hardening in Remscheid-Hasten.
There are many other methods of hardening journals. Plasma spray, and flame processes are two. Jim
From their Website: DEW launches R&D activities on induction crankshaft hardening in Remscheid-Hasten.
Jim Becker
Well-known Member
Induction surface hardening. EF Northrup filed a patent on the basic idea in 1918. Ajax Electrothermic developed the Tocco hardening process. In the early 1920s, Midvale Steel Company did the first application of induction surface hardening, rolls of sheet steel, with Ajax equipment. By the early 1930s, Ohio Crankshaft Company was using Tocco hardening on crankshafts.
As already stated, Eotherm started research in 1938. They built their first crankshaft machine in 1942. Their process changed the shape of the inductor so it could rotate around the journal for more uniform heating than produced by the Tocco process, which uses a stationary inductor that wraps around the entire journal.
I can't give you any numbers on the thickness. It was fairly thin, but thick enough that a crankshaft regrind won't break through it.
As already stated, Eotherm started research in 1938. They built their first crankshaft machine in 1942. Their process changed the shape of the inductor so it could rotate around the journal for more uniform heating than produced by the Tocco process, which uses a stationary inductor that wraps around the entire journal.
I can't give you any numbers on the thickness. It was fairly thin, but thick enough that a crankshaft regrind won't break through it.
Harry Klever
Member
0k, Thanks guys, I did go thru the factory, when the 66 series were being built, They would take the rear axel wrap this over centering clamp, on about the last 6 inch's, that would turn red hot in a heartbeat, the tour guide said they were hardening just that end where the bull gear goes, oh ok,But i am sure that was just a heat treated , hardening!!! They never took us to the crankshaft grinding area!
Jim Becker
Well-known Member
What you describe sounds like the Tocco process. From what I know, IH first used it (for regular production) on crankshafts for the F-12. I don't know when they started, but I'm pretty sure they were doing it by 1935. After WWII they started doing to a lot of parts. For example, the treatment was done to transmission gears for the A/B after they moved production to Louisville in 1947.
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