Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Losing cylindricality by anodizing, and burnishing doesn't fix it

December 22, 2010

Dear Gentlemen / experts,

Now I am working for one of Automotive components which has cylindricality requirement of 10 microns after anodising process in D7.5 inner bore with 5 lands of interrupt cuts (40 mm overall length).

We did Roller burnishing process after anodising in CNC which gives us 12 microns best of result is not acceptable.

Could any one kindly give me some suggestion to improve it?

Before anodising cylindricality - 6 mic

after anodising - 22 mic

after burnishing - 12 mic (Stock for burnishing 15 mic)

Thanks in advance.

Vijayan.D
- Coimbatore, India

December 23, 2010

That is a really tough set of standards to meet.
I would take a look at the racking for the anodizing to see if I could improve the uniformity of the anodize.
You might have to consider adding a fine honing step before the burnishing.
Is the roller as large as it can be?

James Watts
- Navarre, Florida

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: