FUEL PUMP PARTS -CONTAMINATION

[uppili11]

WE HAVE TO DECIDE ON A SUITABLE CLEANING SYSTEM TO REMOVE CONTAMINANTS OF PARTS THAT ARE ASSEMBLED ONTO ARMATURE AND BRUSH BOX ASSEMBLY WHICH CONSISTS OF MATERIAL LIKE PPS,SS,COPPER,STEEL.CAN ANYBODY RECOMMEND A SUITABLE MEDIA OTHER THAN TRI CHLORO ETHYLENE WHICH HAS BEEN BANNED NOW TO HAVE EFFECTIVE REMOVAL OF CONTAMINANTS .

 

[PSE]

Are you looking to clean the parts before or after assembly? What types of contaminants are you trying to clean off?

 

[uppili11]

we propose to have three stages of cleaning.

stage 1:clean of all incoming parts -oil,fibre ,any other dust

stage 2: do assembly operation in a clean room atmosphere-e.g welding/and manual assembly process as well as testing

stage 3: cleaning of the total sub assembly:armature/brush carrier assembly by suitable means and ensure the packaging is also finished in the clean room

the contmainants are mainly fibre ,dust ,oil etc.

 

[PSE]

First suggestion would be (assuming your components are coming from subcontractors) to specify that parts received shall be cleaned and packaged in order to meet your cleanliness requirements. At that point, you should be able to just clean or wipe down the packaging prior to entering your controlled environment.

For fibers and dust, I would suggest a good vacuum system. Blowing particles around with CDA (clean dry air) just gives the particles a chance to settle somewhere else. The oils and films can be a challenge. You might start by talking to the manufacturer of the oil used to determine a recommended cleaning solvent and method. Otherwise you may end up doing some "trial and error" testing. Ultrasonic cleaning and rinsing can work well if your parts are relatively small. Use high purity low residue materials. Dry Ice blasting might also work but I do not have any experience with the method personally.

Welding should use high purity gasses and you should have a fume/smoke extraction apparatus. Again, a vacuum system may work well.

Try to use a "just in time" method of assembly to avoid prolonged exposure of parts to the enviroment (even if clean) otherwise you may find that more time is spent cleaning than assembling.

Good luck

 

[uppili11]

nice suggestion.thankyou.