Quenching jig to prevent warping

J

James Hall

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Sep 18, 2013
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7 minutes into this video http://www.youtube.com/watch?v=tklCifGhGvE a blade is put into some sort of jig prior to quenching. To me this seems like it would lead to uneven cooling, and maybe even hitting the pearlite nose by taking the time to put it in the jig, especially considering that they appear to be water quenching.

Can anyone confirm or deny my suspicions, or does this actually have a practical use?
 
"Can anyone confirm or deny my suspicions, or does this actually have a practical use? "


I think it also makes some pretty nice waffles. :p
 
I can see where it might be helpful when quenching something as large as these cleavers. Looks like hes got it down. I've been quenching blades for many years and what time has taught me is just about all of it is in the heat cycling prior to quenching. If the heat cycling is done the blade wont warp. I forge a lot of knives in the 10 and 12 inch range and blades that large have the possibility of warp; with good forging and heat cycling it rarely happens.

Fred
 
I have similar doubts about that quenching jig, but damn -- that's a skinny tang that he hot cuts in the beginning with a beverly shear!

Later on, he has saw-cut blanks on the forge hearth with normal tangs.

I'm not sure I'd use a video of "kitchen knife manufacture, which brand is very famous in China." as a model :)
 
He's using a waffle machine --but here to prevent warping a blade .A bit was lost in translation !!!!

Actually quenching jigs are used here also. Making tapered roller bearing races we used jigs for that to keep them round .Oil quenched alloys with slits so the whole width of the race got oil over it.Much more reliable.
 
That whole video was great! I am with Fred on this, I think he's got it down and it must be working for him. Also I dont see any issue with the pearlite nose. Many people hear that the "steel has to get to a certain temp in one second or so" and think that is from the forge. It is actually from when it enters the quenchant. You dont have tons of time from taking out of the forge to get it quenched but certainly more than he took to get it in the jig and into the water.
 
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