The authoritative public forum
  for Metal Finishing since 1989
  

  -----

CBN grinding problem for chrome part of aerospace

2004

Hi,

Can anyone answer this question? Couldn't aerospace part (Material 4340) after chrome plating be ground by CBN wheel? Is there any evidences or documents were disallowed?

Thank You!

Tony Hwa
Machine Shop - Kaohsiung, Taiwan

I don't think the problem is with the abrasive itself, but rather with the wheel design and type of binder used. Chrome likes to be ground with wheels specially designed for it.

Guillermo Marrufo
Monterrey, NL, Mexico
2004

---

Mr Hwa,

I think CBN grinding wheel can be to hard for chrome plating deposit.I think CBN grinding wheel is not a specified grinding wheel for hard chrome. Important when grinding hard chrome is to cut the grinding wheel more frequently than grinding other materials. The wheel shall have small grain's and with small grains the smaller will also the grinding area be. The grinding wheel shall also be soft to medium. It's important to get new grains when you grinding.

Regards
Anders S

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden
2004

We have had positive experience grinding Molybdenum compound plasma sprayed onto an aerospace component (turbine shroud segment). We used specially designed vitrified CBN wheels with induced porosity. The wheel does not get loaded and does not inflict metal burns on the component. We have been able to replace a set of two wheel - electroplated for roughing and alumina for finishing - with a single vitrified CBN high-porous wheel.

Gennady Gurinovich
grinding wheels - St. Petersburg, Russia
2004

---

Hwa,

I have no idea what a cbn wheel is or capable of doing for grinding purposes. I do know when grinding 3 to 4 inch dia. shafts 4 foot long O.D. I use 60K Norton. Flood with clean coolant,a slow dress spot plunge down leaving a step along the shaft drag off slowly. A good plate job should not have a lot of build up so you're not fighting the situation all day long. This is the Groher way. Any questions or comments please feel free to ramble.

Mark George Groher
- Cherokee, Iowa, USA
2005

---

2007

Our solution is vitrified CBN or diamond wheel. must has high porous, bigger grit is better and not easy be stuck.
We service for the Chinese aerospace industry.

Besides, your equipment is also very important, if your machine is not precision enough, you can not use vitrified bond product and seems such solution can not offer good result.

Joe Zhou
- Shanghai, China