Machining Engineering

[vishvin1]

Hello sir/madam,

I work for a ceramics seal manufacturing company. We get the rawmaterials in the form of tubes after pressing. Before the parts are fired in the kiln, they are sent to the machining area to cut profiles on it.

Current Situation: The tube is held in between the centers of the lathe and the tube is cut to pieces. These pieces are taken to a CNC Lathe to cut profiles such as shoulder or o-ring groove on it.
Currently the tube is put on a steel mandrel and then sliced according to the overall thickness. The inside diameter of the tubes vary in sizes so we select a mandrel close to the size of the inside diameter of the tube. we wound a tape around the Outside diameter of the mandrel and then put the tube over it and do the slicing. There is always a play in the mandrel.


Future Prediction: My Suggestion would be to cut the profiles(Shoulder or O-ring Groove) on the tube and then slice the parts because they it would increase the production efficiency. I am looking for a mandrel that would fit to the inside diameter of the tube so that the parallelism of the profile that is to be cut will not be affected.

Please suggest a way to improve my process.

Thanks

 

[ornerynorsk]

Would it help to use a low temp alloy to "glue" the ceramic blank onto the mandrel? Or wax, or some other adhesive?

 

[MASSEY]

It doesn't take long to turn a properly sized arbor for the diameter you need to work with. These can be labled and stored. Before long you may have enough assortment so new ones are no longer required. If you have linear clearance a stepped arbor may be used.

This is what we do. The cost of material and time is minimal compared to the overall cost of the job and it renders excellent parts.

We would NEVER consider wrapping tape around an inproperly sized mandrel - this sounds ridiculous, sorry, but it does.

Good Luck.

 

[grinderguy]

Most tool catalogs have mandrells that are adustable using a taper and expanding mandrel. If yours are special, call me and I will make them for you.

Robert Setree

http://www.advanced-grinding.com