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RE: Alternative parts cleaning



Judith,

I'm going to assume that your washing station employs a hydrocarbon solvent.
You could convert to a water-based cleaner but then you would need to follow
up with a drying system to prevent rusting.  The large volume of small parts
you are handling means that you are looking at quite a change in the
existing operation.

Since the cutting oil does provide rust protection during transit and the
voiced objection is over spillage, your client might be able to make due
with an oil removal system.  One approach is to use a "chip wrangler" where
the parts are spun inside a basket and the oil is spun off.  This approach
is widely used to remove oil from metal cuttings and it might be suitable
for this application.  Part size, shape, and their ability to withstand
damage due to impact will be key deciding factors.

The other approach would be vacuum deoiling where the storage drum would be
placed inside a sealed oven, heated slightly, and the interior placed under
vacuum.  This will drive off much of the free oil.  The downside with both
of these approaches is that the receiving facility will most likely need to
clean the parts before use.  Hope this helps.

Mike.callahan@jacobs.com 

-----Original Message-----
From: Judith Wlodarczyk [mailto:jwlodarc@connstep.org]
Sent: Wednesday, December 05, 2001 11:18 AM
To: envgroup-list@mep.nist.gov; p2tech@great-lakes.net
Subject: Alternative parts cleaning




I have a client that manufacturers small carbon steel parts for the
automobile
industry.  They stamp and form the parts from rod-drawn wire on large
presses
using Renocut 464, a petroleum cutting oil, at the rate of 35 parts/minute
coming off the presses.  The oil helps lubricate the cutting as well as the
die
movement.  We are looking to eliminate one of the cleaning steps, which has
become a bottleneck, as all parts produced in the factory are cleaned at one
wash station, causing parts to sit and not flow at the rate we have
targeted.

The cleaning step we would like to eliminate occurs after the parts come off
the
press and before they are shipped out for off-site services.  They have
explored
other lubricants with little success.

The outside vendors have required the cleaning because they do not want to
be
responsible for oil draining off the parts during transportation, causing a
spill that they will be responsible for cleaning up.  The parts are shipped
in
metal containers, holding 18,000-21,000 parts (2000 lbs.) and have to have a
trap door to enable the vendor the easily remove the parts from the
containers.

Questions

1.  Is there another way that would remove the oil without having a separate
wash operation?  For examples, could we use a centrifuge at the press or are
there in-line washers that you have had experience with that would work with
this quantity of parts?

2.  Are there other cutting oils available that could provide the
lubrication
necessary for this operation, facilitating the cutting and the die movement,
yet enable us to eliminate the wash?

Thanks,
Judy Wlodarczyk
Environmental Management Specialist

CONNSTEP, Inc.
1090 Elm St.
Suite 202
Rocky Hill, CT  06067
www.connstep.org

Phone:  860-644-9718
Fax:       860-529-5001
Email:    jwlodarc@connstep.org




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