Hi,
Does anyone have any experience with removing the normailizing process for rough forging stock for gears (5120h material or something similar) prior to green operations (turning, deburring, hobbing, spline rolling etc).
A proposal has been put forward to remove the normalizing process and...
The shafts are loaded vertically, and we have not identified any shafts with higher initial runout values after heat treatment. All shafts typically have an initial runout of approx. 100-300 microns. Thanks for all of your feedback. I have decided to increase the quenching temperature initially...
Yes, you're right. Apologies, that does make it a little confusing. To confirm, there is a radius at the gear to shaft transition (I'm unsure what value the radius is off the top of my head, but I can provide this information tomorrow).
NB: I have also moved the anvil/hammer positions (on the straightening machine) in positions which support the undercut during straightening as to avoid excessive stresses during processing.
The attached word document shows a shaft I have found on the internet which is similar in design. The document also shows the position of the undercut (detail A) and also an example (found on the internet) of the fatigue failure we have found in the field when a cracked shaft has not been...
Sorry that should read 'The straightening operation is directly after TEMPERING, the shafts are allowed to cool however and are not straightened in the hot/warm condition. We have collected the initial runout figures for cracked shafts although there appears to be no correlation. We can have...
....I forgot to mention that the case depth in the area of the output shaft which cracks is only approx. 0.3mm
As this area of the shaft is an undercut (and also because this section of the shaft is masked by the nickel chrome jig to some extent during oil quenching), it is difficult to quench...
Hi All,
I work in the automotive industry for a company who produce transmissions using components made from 5120H steel.
This particular problem involves the output shaft of the transmission, which cracks during straightening subsequent to heat treatment.
The 5120H output shaft is gas...
