utility of an internal groove to a cylindrical component

[DoctorBomber90]

Good afternoon.
I am inside a metalmechanical company and I fell my eye on the hole of a cylinder/zigrinate roller, as in the image below and its sw dissected pattern (so you can understand what I mean).
mi chiedevo:

• la central groove What do you need? do you need to facilitate the insertion of the component on a tree/hide? I imagined the roller without groove and, if I had to put it on a spindle, it would be more difficult to match it than a roller with the groove. other thing is that I think I realize a hole passing on the roller without groove, with good tolerance, is more difficult than one con scanalatura (because you've got a long stretch from the other case).​

Thank you in advance.

 

[meccanicamg]

the centering in tolerance you do only on the two outer bands. in the middle is discharged. it is necessary not to have geometric problems we straightness of the hole.
also the female serious commercial gearboxes have the unloading in between.

 

[meccanicamg]

this hole with central discharge allows to make better geometrically and finish the hole.
during the shaft calettation flows better and you have less impurities problems.

 

[DoctorBomber90]

this hole with central discharge allows to make better geometrically and finish the hole.during the shaft calettation flows better and you have less impurities problems.

the centering in tolerance you do only on the two outer bands. in the middle is discharged. for use do not have geometric problems we straightness of the hole.also the female serious commercial gearboxes have the unloading in between.

so I got there more or less.
Thank you. @meccanicamg for taking away this doubt.
in the next few days I will sketch my post #1, so that those who read or read will better understand this subject.

 

[meccanicamg]

so I got there more or less.
Thank you. @meccanicamg for taking away this doubt.
in the next few days I will sketch my post #1, so that those who read or read will better understand this subject.

great, sharing and clarity is fundamental.

 

[rizzoliomatteo]

Good afternoon.
I am inside a metalmechanical company and I fell my eye on the hole of a cylinder/zigrinate roller, as in the image below and its sw dissected pattern (so you can understand what I mean).View attachment 71592 View attachment 71593
mi chiedevo:

• la central groove What do you need? do you need to facilitate the insertion of the component on a tree/hide? I imagined the roller without groove and, if I had to put it on a spindle, it would be more difficult to match it than a roller with the groove. other thing is that I think I realize a hole passing on the roller without groove, with good tolerance, is more difficult than one con scanalatura (because you've got a long stretch from the other case).​

Thank you in advance.

good evening, it would be interesting to see the writing of the working cycle in such a workmanship.
I hope you can let us down on this.
Good evening.

 

[meccanicamg]

good evening, it would be interesting to see the writing of the working cycle in such a workmanship.
I hope you can let us down on this.
Good evening.

first you make the hole with 0.3mm of overmetal. loop, finishing ra6.3.
then always in ra6.3 or 3.2 you do the central exhaust gorge.
you send to make the treatment of tempering and triple tempering to scale... .usually being an 88mnv8ku or better a x155crvmo12-1ku.
then you take tool to the cubic boron and you end the central hole (if cheap) or you send it into rectification to make external team and central hole (the two bands) without turning the piece with external diameter.
once it is made it is sent in electroerosion and in finishing with acids depending on the processing that must make the roller (filetto, zigrinatura, print a drawing...).

However, in all pieces, the exhaust is first made and then the finishing of the two bands in tolerance.