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Buncher Closing Dies

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6 years 8 months ago #491 by Archived Forum Admin
Howar..

Thank you for your response, this is very helpfull, we have achieved better results.

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6 years 8 months ago #485 by Archived Forum Admin
Hi Raoul,

The theoretical diameter of the stranded conductors going through the die is mathematically determined.

No. wires Construction multiplier
2 2 2
3 3 2.16
4 4 2.42
5 5 2.7
6 6 around a dummy core 3
7 1 center, 6 around 3
8 1 center, 7around 3.33
10 2 center, 8 around 4
12 3 center, 9 around 4.16
14 4 center, 10 around 4.42
15 5 center, 10 around 4.7
16 5 center, 11 around 4.7
17 1 center, 6 around, 10 around 5
18 1 center, 6 around, 11 around 5
19 1 center, 6 around, 6 around 5

Please note that the 19 wire construction can also run as a smooth, round unilay construction, using a shorter lay. The multiplier is then 4.8736

The die diameter is 2% larger than the calculated no.

If you have further questions you can contact me directly.


Best Regards,

Willy Hauer
www.Howarequipment.com

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6 years 8 months ago #486 by Archived Forum Admin
Hi Willy,

Thank you so much for taking the time and effort to share this information.

Best regards,

Raoul

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6 years 8 months ago #487 by Archived Forum Admin
Good day..

I saw your calcs and I'm wondering How to determine the multiplier to go beyond the 19 strands, we currently go up to 105 ends on a double and single twist bunchers/closers, any reading material on this subject available?
Thankyou

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6 years 8 months ago #488 by Archived Forum Admin
Greetings from Toronto,

Your question cannot be answered with a simple formula. As a matter of fact the diameters vary even between single and double twist operations and are also dependent on the actual lay length.

Below is a table which shows the various factors for different geometric formations.

The bunch diameter on a double twist will be approximately 10 – 12% larger and on the Single twist 2 – 5% larger.

This should at least give you a starting point.

n f n f n f
1 1.00 19 5.00 61 9.00
2 2.00 24 6.00 70 10.00
3 2.15 26/27 6.15 75 10.15
4 2.41 28/30 6.41 80 10.41
5 2.70 31/32/33 6.70 85 10.70
7 3.00 37 7.00 91 11.00
10 4.00 44 8.00 102 12.00
12 4.15 48 8.15 108 12.15
14 4.41 52 8.41 114 12.41
16 4.70 56 8.70 120 12.70

I remember that Fred Krafft (Cook Machinery) wrote an article decades ago, covering this subject. Unfortunately I lent my copy to someone and never got it back. Maybe someone can remember this article and get us a link.


Best Regards,

Willy

www.HowarEquipment.com

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6 years 8 months ago #489 by Archived Forum Admin
Willy,
I asked a couple of weeks ago about Fred. He knew a lot about wire manufacturing and was a fixture at the Wire Association meetings for a long time.

Richard/Spectre

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