Variable Draft Double Draw Dead Block
(From 0% to 30% Draft Between the Capstan
Block and Flyer)
EMC'S PATENTED "DOUBLE/DOUBLE"
DEAD BLOCK
Several years ago, EMC Engineering decided
to supply machinery to all facets of the wire industry.
In doing so, we found many customers in need of equipment
customized to their individual applications. So we began
a new line of "Custom Equipment," tailored to
customer requirements.
One such Custom Equipment project resulted
in our company being awarded Patent No. US 6,216,506 B1
on April 17, 2001, for the Double-Draft Wire Drawing and
Collection Machine with Tension-Sensitive Speed Control.
This double-draw system for nonstop production is marketed
by EMC as the "Double/Double" Deadblock machine.
The Project System
A few years ago, one of our customers came
to us with a problem that needed solving. The customer had
a few double-draw deadblocks that were being used for two-pass
drawing. The problem was that they were limited to a couple
of different finish sizes because of the fixed reduction
blocks. This conventional double-draw deadblock had a rear
block with a die and a finisher block with a die, with both
dies on a common main shaft driven by one motor. The finish
die was limited to the fixed reduction between the ripper
and finisher blocks which were different diameters.
To solve this problem, we decided to try
the "Double/Double" Deadblock concept. This new
deadblock design was similar to the old two-pass deadblock
except that each block was now driven by its own motor and
gear reducer. We also incorporated a dancer control between
the two blocks so that the die lineup could be infinite
between "coil only" on the finisher to 30% on
the die lineup between the blocks. The beauty of the system
was that it could now take infinite reduction of areas between
the finisher and ripper blocks.
As a result of this project, we installed
the first machine and the customer was able to run multiple
finish sizes to boost productivity by nearly 100% over conventional
two-hole stripper-type bull-blocks and increase finish size
ranges on the conventional two-pass deadblock.
We now have several of these machines located
at different customer sites throughout the USA.
The Patented System
According to an abstract issued by the
United States Patent and Trademark Office, Patent No. US
6,216,506 B1 is a double-draft continuous wire drawing and
collection machine with first and second reduction dies
for drawing wire in succession. A rotary advancing block
driven by a variable-speed first motor draws wire rod through
the first reduction die, and a rotary flyer mechanism driven
by a second motor draws wire through the second reduction
die as it coils wire on a stationary block.
A tension control arm and rheostat regulate
the speed of the first motor based on wire tension differentials
detected between the rotary advancing block and the second
reduction die, in order to maintain constant wire tension
in that wire segment. For more on the advantages of the
"Double/Double." contact Engineered Machinery
Company.
Standard Deadblocks
