Using Copper Plating as a Lubricant to Deep Draw CRS

I feel you will be reducing larger diameter tube to smaller diameter.If the wall thickness of the tube also to be reduced (depending upon the requirement)then you will have to use mandril and then only the copper coating will be useful on inner side otherwise not. ( kindly let us know the original diameter of tube and subsequent diameter and length reqirement of the tube)

Usually if copper plated tube after redrawing is replated then there is chance of "peeling off" the copper plating so they prescribe stripping. Secondly smaller diameter tube ( depending on diameter) can not be plated uniformly from inner side due to air locks as well as inherant plating procedure.

There were drawing lubricants back in the 1940's.

I'm surprised that they dont ask for a phoscoating instead.

Its much better lubricant than copper. But I am not sure what would have to be done to get a copper plate to adhere over top of this, as it is a chemical conversion coating.

My point is, if the govt spec has to be followed you'll have to follow it;

If the idea is to get a difficult tubing drawn, Zincphos is probably the better way to go;

If after drawing the copperplate is mandatory, I can't help you about stripping/ copper plating the Znphos.

I will be back in office monday and can look this up in my archive.

milo "enjoying tampa very much, thanks"

Using a product like McLube Mos2-108L would work a lot better. It is a molybdenum disulfide dry lubricant.

Is there any chance that the tubing needs to be soldered in place? This would be a good reason for plating.

Bill

Now a days Cu plating is not at all used for low carbon material like 1008.This subject comes under the heading of Bulk metal Forming.It appears, that you have World War II Specification in the drawing.The current practice is to Zn. Phosphate & lube with molycoating or soaping, after proper annealing of the slugs. Phosphating is taken to mean generation of cohesive crystalline phosphate layers which are firmly adheared to the substrate material. This is only a pre-treatment process prior to Mo S2 application or sodium stearate solution dipping. By this way, you will completely eliminate Cu Plating prior to cold extrusion or cold forging. Therafter you can extrude the slug either by backward or forward Extrusion . Over the last 30 years, the forming technology has been radically changed by a number of innovations. This even includes to eliminate phosphating process which is considered to be bad for environment. Please watch out for new processes. For more info. please visit www.schuler.com Rangasamy.