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+--- Thread: Steel forging or steel casting (/showthread.php?tid=1998)
RE: Steel forging or steel casting - Hedd_Jones - 16-11-2018
Steel castings were extensivley used in all sorts of things bob, from about 15 years before Stanley Edge put pen to paper.
RE: Steel forging or steel casting - Chris KC - 16-11-2018
(16-11-2018, 05:06 AM)Bob Culver Wrote: There must have been many accidents. And fumes would take a toll. No safety glasses.I recall being shown around Garringtons' forge as a trainee engineer; even in the 1980's I scarcely met anyone with a full complement of fingers...
RE: Steel forging or steel casting - Colin Morgan - 16-11-2018
Don't know which it is.
As it says on various sites, the advantage of a forging would be precision, consistency and strength - makes the best use of the properties of steel. The advantage of casting would be rapid production of such a complex shape - though there would be drilling/machining required and possible problems with tolerances. Also a casting would be more likely to contain significant defects that might cause failure in a part subject to multiple and diverse loading.
From the picture, edges look rounded, the shape could be moulded, so it could be a casting? If someone has one to hand - does close inspection give a clue? Is there a surviving sharp mould line?
RE: Steel forging or steel casting - Duncan Grimmond - 16-11-2018
My guess would be forging/stamping finished hot in (a series of ?)press-tools to maintain accuracy and tensile strength.
RE: Steel forging or steel casting - Paul N-M - 17-11-2018
(16-11-2018, 05:41 PM)Duncan Grimmond Wrote: My guess would be forging/stamping finished hot in (a series of ?)press-tools to maintain accuracy and tensile strength.
Agree.
RE: Steel forging or steel casting - Dave Mann - 17-11-2018
Casting steel is not an easy process and wasn't mastered till the 1970s so I go for forging.
RE: Steel forging or steel casting - Tony Press - 18-11-2018
(17-11-2018, 09:54 PM)Dave Mann Wrote: Casting steel is not an easy process and wasn't mastered till the 1970s so I go for forging.
The Austin Motor Company film shows the rear axle casings being cast from steel in the 30's.
RE: Steel forging or steel casting - Steve Hainsworth - 18-11-2018
I have just had a look t two chassis in good ,clean condition.
Close inspection would indicate a forging.
The tell -tale signs are :
1/ drawing marks in the vertical plane down the sides of the channels
2/ The product has been trimmed all the way around in a press die to remove the flash from forging operations
3/ part number is crisp and proud of the undersurface which indicates high pressure applied.
Another reason for me would be the fact that the spring mount flange carries a cantilever load of some severity, and yet I have never seen one broken, even though NZ roads were a harsh test in the 1920s. Not something I would cast with my metallurgical knowledge.
That said I believe many other seven components were cast steel - Some of them are:
1/ Steering boxes and side covers in the early thirties (not always though)
2/ Dynamo mount /fan mount castings- coil engine-I have two of these in steel
3/ Rear Axle casing ends - these were originally brazed to the axle tubes but later (33 on -D type ) they were friction or resistance - Butt welded to the axle tubes.
4/ 3 piece rear axle center casings (until the D axle arrived)
cheers Steve H
RE: Steel forging or steel casting - Bob Culver - 19-11-2018
It is not my territory but for smallish items of a shape able to be forged that process would reduce the energy for heating as well as giving superior structure. Quite a bit of work in assembling and dismantling a mould, whereas the forging is a quick stomp.
Confusion possibly arises with malleable cast iron; I am not sure when that became common. I presumed integral drum/hubs, and diff bodies of 1950s cars are of this. Judging from ones I have dropped, ordinary cast iron drums are not malleable. Pesume malleable iron cannot be welded without complications.
RE: Steel forging or steel casting - Colin Morgan - 22-11-2018
Accepting that the nosepiece is generally a forging, then, I wonder if it started off as a casting on the very early cars ('22/'23)? This might account for it being described as a casting in a few references?
Colin