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- Sep29Rock Barn Golf and Spa, Conover, North Carolina
- Hello again Mr. Ajalloueian,
The reduction angle for copper drawing dies is an interesting subject. North American wire manufacturers usually specify reduction angles of 16 to 20 degree whereas European wire manufacturers typically specify reduction angles of 18 to 22 degrees.
Generally speaking, the length of the bearing in the die determines the final size of the wire but of course, it is not that easy as there are other issues involved.
It is reasonably clear to us that you have a limited technical library at your company. thus we suggest the following;
1) Purchase the Nonferrous Wire Handbook, Vol. 3 at
2) See if your wire die supplier has a technical pamphlet or book on drawing dies including how to maintain them. Generally speaking, these are free for their customers.
3) Drawing lubricants are also fundamental to the drawing process including Babcock measurement and control. See if your lubricant supplier has technical literature on their products. Again, free for their customers.
Optimized die geometry is best done by process experimentation over long periods of time.
- Hello again,
I have looked at a photo of a SAMP RC-80 Annealer and apart from the layout of the machine, the process issues are still the same.
I) The wire is too hot entering the annealing leg or;
II) The steam supply is for some reason now inadequate at the steam tube keep oxygen completely away from the entering wire, hence the mild amount of discoloration or;
III) Your annealing solution is too contaminated and must be replaced.
Anyway, that is all we can do from here. You must sleuth out the process issue. Let us know when you have solved the problem.
- Hi Peter,
Many thanks for your reply.
The rod machine is Type F13 Winget Syncro and the annealer is a SAMP Annealer type RC-80. Therefore it is not as per specification as ques 6 above in your reply. The drawing machine is not running over speed (and at max 1524 mpm), that answers your ques 2.
I unfortunately do not have any specification of the annealers, so I can't confirm 4 and 5. I also checked the steam line which is aligned with wire inside. I can see if I can manage to increase the coolant water and emulsifiers pressure in the annealer, just to check if does make any difference. Line speed must keep fixed, however, we can adjust the annealing constant (7- to adjust the annealing voltage if you think it could help. We faced no issue with the elongation which is ca. 26-28%.
Please advise. Thank you for your time.
- Dear All
We are manufacturer of cooper magnet wire. could anyone please inform me what is the
effect of reduction angle and bearing length on the wire drawing process.
How i must find the best reduction angle and bearing length for my drawing machine?
- Hi Peter,
Hope you are doing well.
I have a question regarding copper wire annealing process.
We use Winget-Syncro rod breakdown and annealing machine with a centre lubrication system. We also use another wire drawing machine for screen wire drawing from the same lubrication system; however the copper wire drawn from the rod breakdown machine is producing dark copper wires directly after the annealing while the other machine is not. We use maximum allowable steam to purge oxygen for avoid oxidation and the cooling water inlet is set to the maximum point as well. The wire colour doesn’t change until it goes into the annealing chamber.
Now that, I wipe cleaned some samples from the output bobbin with kerosene and was able to get rid of the dark colour. It became shiny and lighter in colour (however, not as much as hard drawn copper, but acceptable). As wiping the wire with kerosene during operation is not possible, I am looking for alternative to solve the problem. I believe it has to do with the annealing process but do you think of any other reason why the wire is producing dark copper wires? What is the required temperature/pressure of the steam and cooling water inlet/outlet in the cooler?
Many thanks for your time.
- Erik A Macs, Mr Thomas Doan, Peter J Stewart-Hay replied to the topic 'Micro planetary strander' in the forum.Thomas - I have supplied a micro wire vertical planetary system in the past for copper based wire. Bobbins utilized were Spirka style (about 80mm diameter). Holders were basically the same as a standard braider bobbin holder. It may work with stainless depending on flexibility. Feel free to email me if you want to pursue.
Erik Macs, Director of Sales
Wire and Plastic Machinery Corp.