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Патент USA US3035475

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May- 22, 1962
F. D] NICOLANTONIO, JR., ETAI.
' 3,035,465
ROLLING MILL CONTROL APPARATUS
Filed Sept. 25, 1957
' 2 Sheets-Sheet 1
2
Screwdown
'
Motor
Control
Screwdown
Device
Digital
Proqromer
Fig.|.
WITNESSES;
(BWmQR
INVENTORS
Frank DiNicolontonio Jr. a
wmord M. Bri?uin.
ATTORNEY
'
May 22, 1962
F. DI NICOLANTONIO, JR, ETAI.
$035,465
ROLLING MILL CONTROL APPARATUS
Filed Sept. 23, 1957
2 Sheets-Sheet 2
326:a9l05‘.1
mm
Ll
mm
1?
o
0.
$235358
W53.
N.36:20
3,935,465
Patented May 22, 1%62
2
3,035,465
ROLLING MILL CONTROL APPARATUS
Frank Di Nicolantonio, .l'r., Lockport, and Willard M.
Brittain, Amherst, N.Y., assignors to Westinghouse
Electric Corporation, East Pittsburgh, Pa., a corpora
tion of Pennsylvania
Filed Sept. 23, 1957, Ser. No. 685,498
1 Claim. (Ci. 80-56)
signals to a control device 38 operative with a relay de
vice éi) for controlling the operation of a digital pro
gramming device 42 as will be later explained. The
digital programming device 42 may be operative through
a motor control 44 for controlling the operation of the
mill motor 46 that is operative with the roller members
12 and 14. Other control functions, such as control
ling the screwdown motor control 22 and the like may
also be performed, as will be apparent to persons skilled
The present invention relates, in general, to control 10 in this particular art.
apparatus for a rolling mill, and more particularly to con
trol apparatus for a rolling mill wherein said control
In FIG. 2 there is shown the voltage source 36 con
nected through a reactor member 50 and an adjustable
apparatus is responsive to a control signal provided by
resistor 52 to the primary winding 32 of the magnetic
a piece of material to be rolled either entering or leaving
strain gauge device. The ?rst control winding 30 of the
a particular stand of said rolling mill.
15 magnetic strain gauge 24- is operative with a ?rst transis
It is an object of the present invention to provide
tor ampli?er device T1 which ampli?es the output signal
improved control apparatus for a roller device operative
from the ?rst control winding 30 such that it can operate
with ‘a piece of material, wherein the pressure between the
a ?ip-?op circuit 56 including a transistor T2 and a tran
roller members is employed as an indication of the posi
sistor T3. The second control winding 34 of the mag
tion of a workpiece and provides a control signal for 20 netic strain gauge 24 is operative with a similar transis
controlling the operation of the roller device as may be
tor ampli?er T4.
desired.
The transistor ampli?ers T1 and T4 are temperature
it is another object of the present invention to provide
compensated such that the output voltage of these am
improved rolling mill control apparatus, and more par
pli?ers will not drift too excessively during ambient tem
ticularly to provide improved control apparatus for a
perature changes. A ?rst rate control circuit including
rolling mill utilizing a magnetic sensing device to determine
a capacitor C3 and a resistor R9 is connected between the
the position of a workpiece, such as a piece of material
output of the transistor ampli?er T1 and the base circuit
operative with said rolling mill, and to provide a signal
of the transistor T2 in the flip-?op circuit 56. A second
for controlling the subsequent operation of one or more
rate control circuit including a capacitor C6 and a resis
stands of the rolling mill relative to that same workpiece 30 tor R11 is connected between the output of the transistor
or other workpieces as may be desirable
ampli?er T4 and the base circuit of the transistor T3 in
It is a further object of the present invention topro—
the ?ip-?op circuit 56. These rate control circuits keep
vide improved control apparatus for a rolling mill, which
the slow varying voltages from across the respective am
control apparatus is more rapidly responsive to the actual
pli?ers T1 and T, from e?ecting the operation ofthe ?ip
operation of the mill as may be desired for controlling 35 ?op circuit 56. The diodes 2D and 5D keep any in
the mill operation and to improve the efficiency of such
creasing negative signals from appearing on the ?ip-?op
operation.
It is an additional object of the present invention to
provide improved control apparatus for a rolling mill,
which apparatus is better responsive to the position of a
circuit 56, thus protecting the ?ip-?op circuit 56 from
damaging increasing negative signals and also to prevent
of the mill relative to that workpiece as well as other
the ?ip-?op 56 from changing its operative state for
an increasing negative signal.
The diode 1D and resistor R10 are operative with the
‘ ?rst rate control circuit including the capacitor C3 ‘and
desired operations of the mill relative to that workpiece,
which other desired operations are dependent upon the
up on an increasing negative signal such that when the
workpiece as desired to improve the reversing operation
resistor R9 to prevent the capacitor C3 from charging
position of said workpiece.
45 increasing negative signal disappears, the capacitor C3
These and other objects and advantages of the present
will have a very small voltage which cannot change the
invention will become apparent in view of the following
description taken in conjunction with the drawings, where
operative state of the ?ip-flop 56. The diode 6D and
resistor R12 performs the same function relative to the rate
in:
circuit including the capacitor C6 and resistor R11.
FIGURE 1 is a schematic showing of the arrangement 50
In the ?ip-?op circuit 56, the diode 4D assures that
of the control apparatus in accordance with the present
when the transistor T2 is not conducting it will not become
invention; and
conductive and the diode 3D assures that when the tran
FIG. 2 is an electrical schematic showing of the con
sistor T3 is not ‘conducting it will not become conductive.
trol apparatus of the present invention.
The transistors T5 and T6 are operative as ampli?er devices
In FIG. 1 there is shown the housing 10 of one stand 55 for operating the relay 58. When the relay 58 is ener
of a rolling mill, including an upper roller member 12
gized, the contact member 59 closes a circuit operative
and a lower roller member 14 which are adjustable in
with the digital programming device 62 for operating,
spacing as well known to persons skilled in this art by
for example, the screwdown motor 20 through the screw
means of a screwdown device 16 for determining the thick
down motor control 22. The digital programming device
ness or gauge of a piece of material 18, such as a strip 60 62 may operate the mill motor 46 as shown in FIG. 1
of steel, which passes between the roller members 12
for reversing the operation of the rolling mill if desired.
and 14. The screwdown device 16 is provided with a
The magnetic strain gauge 24 as shown in FIG. 1 is
motor 2% and a screwdown motor control 22 as well
mounted on the housing of the stand 10 of the rolling
known to persons skilled in this art.
mill such that the Loom 28 is movable relative to the
A magnetic strain gauge 24 including a ?xed E-shaped 65 stationary E-core 26 and is so movable proportional to
core member 26 and a movable core member 28 is pro
the stretch or strain in the housing 10 of the rolling mill
vided with the center leg of the E-shaped core member
including the roller members 12 ‘and 14, which stretch
26 having wound thereon a ?rst control winding 30, a
is due to the roller pressure between the roller members .
primary winding 32 and a second control winding 34. A
12 and 14. The primary coil 32 provided on the stationary
regulated direct current voltage source 36 is connected 70 E-core 26 is operative to establish a flux level in both
to energize the primary winding 32. The two control
the movable core 28 and the stationary core 26. The
windings 30 and 34 are connected to provide control
?ux level for the latter cores is dependent upon the num
3,035,465
4
by cause the transistor T4 to become more conducting.
At the same time, ‘a control voltage is induced in the sec
ondary winding 30 which causes the base of the tran
sistor T1 to become more negative with respect to emitter
to make transistor T1 less conducting which causes the
transistor T2 in the ?ip-?op circuit to turn On. With
ber of ampere turns of the primary winding 32 and also
on the gap that exists between the movable core 28 and
the stationary core 26. The secondary windings 30 and
34 are provided such that when a piece of material 18
enters the space between the roller members 12 and 14,
or when the piece of material 18 leaves the space between
the roller members 12 and 14, the gap between the sta
tionary core 26 and movable core 28 will change. This
change in gap will cause a voltage to appear on the sta
transistor T2 On, it will make transistor T3 turn Off, the
base of the transistor ampli?er T5 is made more positive
with respect to emitter to turn On the transistor T5 to
tionary windings 30 and 34, which voltage is dependent 10 thereby turn Off the transistor T6 and thusly deenergize
the relay device 53 relative to the voltage source 61.
In the operation of the control device, as shown in FIG.
on the equation
__ a
E~
Nd,
2, lower frequency rate of change control signals are
prevented from operating the ?ip-?op device 56 by the
where E is the voltage developed by the coil, N is the 15 rate control circuits including the capacitor C3 and resistor
number of turns of the coil, ‘and
R9 relative to the transistor T2 ‘and the capacitor C6 and
resistor
R11 relative to the transistor T3. In addition,
(M
higher frequency rate of change voltage signals due to,
dt
for example, noise in?uences are prevented from operating
20 the ?ip-?op device 56 by the capacitors C20 and C21 rela
is the change in ?ux in the coil with respect to time.
tive to the transistor device T2 and by the capacitors C30
The reactor 50 in series with the voltage source 36
and C31 relative to the transistor T3.
It should be understood that the present control appara
tus may be operative with a reversing rolling mill to
and the primary winding 32 is provided to minimize any
line voltage variation from effecting the voltage induced
in the secondary windings 30‘ and 34. Since the voltage
source '36 is a direct current voltage source, slow chang
ing temperature effects relative to the gap between the
movable core 28 land the stationary core 26 do not result
in an appreciable induced voltage in the secondary wind
25 reduce the thickness of ‘a steel ingot down to the size of a
bloom or slab as known to persons skilled in this art. In
ings 30 and 34.
this regard, it may require twenty passes back and forth
through the mill to effect the desired reduction and size
of the ingot. Thusly, as the ingot ?rst enters the space
When a ‘workpiece either enters or leaves the space 30 between the roller members 12 and 14, it may be desired
between the roller members 12 and 14, the resulting in
duced voltage in the secondary windings 30 and 34 may
not be su?icient to operate the ?ip-?op circuit 56 directly,
and thusly, the voltage signals from the respective sec
ondary windings 30‘ ‘and 34 are ampli?ed by the respective 35
transistor ‘ampli?ers T1 and T4, which increase the signal
level out of the respective secondary windings 30 and 34
a su?icient amount to operate the ?ip-?op circuit 56.
to accelerate the mill in response to the control signal
thereby received ‘from the strain gauge 24. As the ingot
subsequently leaves the mill, it may be then desirable to
decelerate the mill by decreasing the speed of the mill
motor 46. Further, as the ingot leaves the mill, it may be
desirable to advance the digital programming device 42 to
the information required for the second pass, and to
reverse the operation of the mill, and to decrease the
screwdown spacing through the screwdown motor control
The rate circuits including the capacitor C3 and resistor
R9 in one such circuit ‘and the capacitor C6 and resistor 40 22 and the screwdown motor 20. Then as the ingot enters
the mill from the opposite side and in the opposite or
R11 in the other such circuit are operative to keep slow
reverse direction, then it ‘is again desirable to accelerate
varying voltage changes in the respective secondary wind
the mill in response to the signal received from the strain
ings '30 and 34 from operating the flip-?op circuit 56.
gauge 24 and to subsequently decelerate the mill as the
When a workpiece enters the space between the roller
members 12 and 14, a voltage is induced in the secondary 45 ingot leaves at the end of the second pass. Thusly, this
operation may be repeated ‘with the mill for each of the
winding 30 such that the base of the transistor T1 becomes
successive twenty or so passes through the rolling mill 10
more positive with respect to emitter to cause the tran
as may be desired.
sistor T1 to become conductive. However, the diode 2D
It should be further noted that alternating current
is poled to short the resulting increasing negative control
signal from the ampli?er T1. At the same time, the sec 50 energization of the strain gauge 24 may be suitable with
a closely regulated alternating current voltage source sub
ondary control winding 34 is provided with an induced
stituted for the voltage source 36 as shown in FIGS. 1
voltage which makes the base of the transistor ampli?er
and 2.
T4 more negative with respect to emitter which makes
Although the present invention has been described with
transistor ampli?er T4 less ‘conductive and turns On the
a certain degree of particularity, it should be understood
transistor T3 in the ?ip-?op 56. This results in the base 55 that
the present disclosure has been made only by Way of
element of the transistor ampli?er T5 becoming less posi
example and that numerous changes in the details of con
tive with respect to emitter such that the transistor ampli
struction and the combination and arrangement of parts
?er T5 is turned O? to thereby result in the base element
may be resorted to without departing from the scope and
of the transistor ampli?er T6 becoming more positive with
the spirit of the present invention.
respect to emitter to turn On the transistor ampli?er T6 60
We claim as our invention:
and thereby energize the winding of the relay device 58
In control apparatus for a rolling mill operative in one
from the voltage supply 61. When the relay device 58
direction and in the opposite direction and including a pair
is so operated, the contactor 59 closes its contacts to
of roller members operative with a piece of material, the
energize the digital programming device 62 to provide in
combination of a roller pressure sensing device for provid
‘accordance the punch markings on provided control punch 65 ing a control signal having a predetermined change in
cards or previously stored digital programming informa~
value when said piece of material changes the pressure
tion the operation of the screwdovm motor 20 and the
between said roller members by a given amount within a
mill motor 46 and other devices that may be operative
selected time period, a mill control device operative with
with the rolling mill 10, and as could be readily provided
said mill for changing the direction of operation of said
by persons skilled in this art after having the bene?t of 70 mill, and a rate of change device operative with said mill
the teachings of the present invention.
control device and responsive to said control signal when
As the workpiece leaves the space between the roller
the value of said signal changes by said given amount
members 12 and 14, a control voltage is induced in the
within said selected period of time.
secondary winding 34 such that the base of the transistor
T4Vis made more positive with respect to emitter to there 75
(References on following page)
5.
3,035,465
6
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,176,742
2,339,359
2,342,374
2,660,077
2,708,254
Pierre _______________ __ Oct. 17, 1939
Shayne et ‘a1. __________ .._ Jan. 18, 1944
Shayne et a1 ___________ __ Feb. 22, 1944
5
2,726,544
Macaulay et a1 ________ __ Nov. 24, 1953
Macaulay et a1. ______ __ May 10, 1955
Anastasia et a1 _________ __ Dec. 13, 1955
2,819,396
2,820,937
2,830,249
Russell ________________ __ Jan. 7, 1958
Fogiel _______________ __ Jan. 21, 1958
Peterson ______________ __ Apr. 8, 1958
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