Flat Wire 6*1.5mm Possible in Wire Drawing Machine?

I'd have thought you'd need to roll it rather than draw, but It's not my field of expertise, so that's just gut feel.
Del

I have a wire drawing machine that can do this in one pass. It is a PC with a plotter. I can have it draw the round rod and then draw the rectangular rod.

To be serious, I don't think that was your question...

I can't see how you could exert enough force to draw the wire and achieve consistent results once you get to the 1.5 dimension. Were you thinking of extruding, not drawing?

Are your dimensions in millimeters? I will presume mm and not inches. If you are working in inches, then you can draw the material, but you will need a ridiculously enormous, expensive, impractical machine to draw even the softest... oh nevermind. You must be working in millimeters.

You will need several sets of rolling dies, starting with round dies to reduce the 6.5mm cross section area until the cross section area (not diameter) is close but very slightly larger than 6*1.5 = 9mm.

If your round reducing dies finish with an oval shape, then the last pass could be a profile die that squares the round rod into the 6 x 1.5 shape without significant elongation of the material.

The more precise your finished size requirement, the more dies you should use, and if you need a very exact (for instance 6.005 x 1.505) finished product then you will need to use more profile dies and a much more expensive forming machine.

That would have to be another process AFTER the wire is drawn

I doubt that it is possible in one pass through a drawing machine with several stepped dies, but you would need to consult with a wire drawing company with experience with your desired alloy. You'd probably need several annealing steps. Seems it would make sense to start with smaller wire.

They make flat copper voice coil wire. Not sure how.

I remember some cross-section adverts for Altec Lansing drivers in the 70s. The 620 and 604b, and the 1604 for sure, the 515b. Also in the large format compression drivers for horns in the 288 290 and 291. These and many others used edge-wound flat wire to increase the number of turns per inch while maintaining a cross section large enough to hand the power requirements of the big drivers. That rectangular wire was slit from sheets, making a nice uniform width and very thin thickness.

Assuming desired conductor is 6mm x 1.5mm, I would begin with a round wire with a diameter of 3.4mm (9mm² or 10BWG) and roll it. The end product would have rounded edges.

How many stages? It depends on the material being rolled and well as other factors which you have not stated.

The alternative, mentioned above, would be to slit 1.5mm thick material into strips. The end product might have a slight burr.

Which method is best depends upon how the end product will be used.