Metal finishing Q&As since 1989
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Mirror like finish for S.S Fasteners
Q. We require a solution for finishing of S.S fasteners. We are looking for brilliant luster.
We have devised a method to remove carbon deposits and degrease the fasteners but are not able to get that final luster. We are not interested in buffing and are looking for a product which doesn't take long. The whole process should last not more than 55 minutes including 7 minutes for degreasing and carbon removal through our process.
Kindly suggest. We are trying to develop this process for a Fastener manufacturing company.
- MUMBAI, MAHARASHTRA, India
2005
A. You can't beat mechanical finishing for brightness and smoothness. The best way to do this is via mass finishing equipment. You can try tumbling part on part, if you have a lot of volume, but you may have to work with a burnishing media in a wet process or go to a treated organic material for a dry process. Not enough info to determine which is best for your application.
AF Kenton
retired business owner - Hatboro, Pennsylvania
2005
2005
Q. Dear Sir,
Thank you very much for your response.
Kindly suggest as to what more info you need that we can provide you with.
Currently the company is employing acid baths and caustic bath for finish which requires around 87 minutes for a batch of 100 kgs of fasteners.
Their daily production is around 20 metric tons. They want to reduce this time by at least 20-25 minutes.
They also use mechanical tumblers/mixers in which the fasteners are dipped along with the cleaning media.
Hope this will help you.
Awaiting your favourable response on the above.
- Mumbai, Maharashtra, India
A. How much money is in your budget? You have 2 choices. Big or Fast? You can get a big old barrel tumbler that can handle a lot of parts in a batch over a long period of time, but this is a slow process. Considering the time and volume you mentioned, I think you have to consider a large centrifugal mass finishing system. Either a high energy disc or barrel system. These are not cheap, but they produce mirror finish parts (provided you use a burnishing media) in a reasonably short period of time. Pricing for a 10 cu. ft. system is over $50,000.
AF Kenton
retired business owner - Hatboro, Pennsylvania
2005
A. Please use vibratory bowl & oblique drum.
Debashish Ghsh- Bhayander, Bombay, India
2006
Q. To continue with the same query, we are using saw dust in a hex barrel to de-grease the rivets before threading. However, de-greasing takes a lot of time, say 30 minutes for 150 kg rivets. I have heard about burnishing process. Can someone explain in detail as to how it can be helpful and what is the exact quantity that is to be added. I am from kolkata, India. Can I use any other substitute for saw dust?
rakesh bajoria- kolkata, India
October 22, 2012
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