We make a clutch shaft from a 3-3/4 dia x 20" long piece of 4140 HT'd to 270-320 as the base matl. The part has a splined section requiring induction hardening to 50-55 HRC. We are experiencing a very high percentage of scrappage after induction hardening due to cracking in the splines.
We have...
TVP,
Thanks a million for the input.
It sounds like the nitriding process could be the solution if it will limit the distortion. I wonder what kind of hardness we could expect?
I am going to start looking for a vendor who could do this for us.
What would you change about this process for...
btrueblood,
Thanks for the kind words, I too mostly lurk in the shadows learning and this forum is a godsend for getting varied opinions and advice for problems that seem beyond our capability to solve.
I am very grateful to all those who took the time to make suggestions and we are pursuing...
Tmoose and mscooling,
Tmoose their knockoff part is wearing out. The application is commercial fishing. The gear is part of a device used to pull in the purse seine nets on fishing boats and is driven by a smaller pinion gear mounted to a hydraulic motor.The gearset is in the open, not inside a...
mfgengear,
No, we are a small manufacturing company in Seattle. We designed and manufactured lots of different gears over the years but we use outside sources for gearcutting, heat treating and grinding.
Our various ring gears have a thin profile which tends to distort when heat treating. It...
Swall, Thanks again for the advice. To answer the questions the minimum tooth hardness is likely about 52RC
The gear profile is flat which would allow for "temper straightening".
I will check with our vendors to see if they can do it.
TVP, thank you so much for your comments. I am very...
Thanks Swall for replying. I know its a laundry list but had to get most of the info onto the thread to reduce the amount of questions that may have come from those who could offer help.
Our bottom line is we want to make a more durable gear that is manufacturable in our area with a minuimum of...
First the problem:
We make a ring gear that is not durable enough for our customer application. They have made their own gear which they claim lasts longer. We want to get the business back which means we have to make a gear that is equal to or better than theirs but have to be price...
Can anyone give me some guidance/advice?
We make a ring gear 21" od x 19-1/2" id x 1-1/4" thk from HT 4340 (320-360bhn) which is about the hardest that our gearcutter can cut. We burn the rings from annealed plate then HT the rings and then we machine them and gerarcut them
We have a customer...
