US2017040A

US2017040A - Roll mill setting

Info

Publication number: US2017040A
Application number: US661973A
Authority: US
Inventors: Lawrence S Dahl
Original assignee: American Sheet and Tin Plate Co
Current assignee: American Sheet and Tin Plate Co
Priority date: 1933-03-21
Filing date: 1933-03-21
Publication date: 1935-10-15
Anticipated expiration: 1952-10-15

Description

. L. s. DAHL ROLL MIL L SETTING Oct. 1 5, 1935.

' Filed March 21, 1933 [wen afar.

I ZHWEE/VCE 6. 0/4/44 metal strip in long lengths. One of the objects Patented Oct. 15, 1 935 rUNlTED STATES 2,011,040 Ron. MILL sa'r'rmc.

Lawrence S. Dahl, Gary, Ind., assignor to American Sheet and Tin Plate Company, a corporation of NewJersey Application March 21,

2 Claims.

This invention relates to rolling mills and particularly to a large mill having its pressure screws operated by electric motors and cold rolling wide is to provide ,a means for obtaining the proper initial roll setting prior torolling so as to eliminate some of the labor involved and provide for more accurate adjustments. Other objects may be inferred from the following illustrative example of one form of the invention.

Referring to the drawing:

Figure 1 is a partial elevation of a mills pressure screws and their operating motors.

Figure 2 is awiring diagram for controlling these motors. Y

The drawing illustrates only the essentials needed to effect the disclosure. A four-high set of cold rolls l is housed in the conventional manner of large mills. The pressure screws 2 and 8 are respectively connected to electric motors 4 and 5 by suitable gearing B and 1.

The motors 4 and 5 have their drive shafts provided with an electromagnetically operated clutch 8 suitably arranged so that its operation interconnects the shafts for mutual rotation. The gearing 6 and 1 is efiected so that when the motors 4 and 5 are so interclutched the pressure screws 2 and 3 will be mutually raised andlowered.

Referring now to the wiring diagram which illustrates one. means of efiecting the control of the motors 4 and 5 and attaining the inventor'sstated object. It also provides other advantages which may be appreciated by anyone who has attempted to set the rolls of such heavy mills by the usual process of manipulating a number of push but I tons. x

Power lines 9 and I provide the current for the motors 4'and 5.. The line 9 is connected to their series fields 4 and through the usual accelerating resistances I and I 2, overload switches and the like. These are thus briefly mentioned because their conventionality assures their proper arrangement by' any mill electrician. These motors also include the usual series braking fields I3 and I4. The armature 4 ofthe motor 4 is connected to the line l0 through electromagnetic switches l5 and I6 and to the line 9 through :similar switches l1 and I8. The armature 5 of the motor 5 is also connected to the line l8 through electromagnetic switches l9 and 20, and to the line 9 through switches 2i and 22 of the same type.

It will be'seen that the motor 4 is operated in one direction when the switches l5 and II are 1933, Serial No. 661,973 (01. 80-56) closed and is reversed when the switches l6 and I! are closed. This relationship also applies to the motor 5 when the switches associated therewith are similarly operated.

The control of these various electromagnetic 5 switches is eflected by two

drum controllers

23 and 24. The one numbered 23 might be termed the master controller while the other might be termed the leveling controller.

The rotative plural contact drums of these con- 10 trollers are in each instance connected to the line 9 and are thereby energized. The stationary contacts are arranged in circuit with the various electromagnetic switches controlling the two mo tors and with the coil 8 of the clutch 8 so that the following sequence of operations. obtains. When the drum of the master controller is turnedin one direction the switches l5 and- I8 01' the motor 4 and the switches l9 and 22 of the motor 5 are closed so thatthe two motors are simultaneou'sly operating with the two pressure screws moved in the same vertical direction. The solenoid 8 of the electromagnetic clutch 8 is simultaneously operated so that the two motors are'interclutched and positively equal pressure screw 2. ,movement results. l

when the drum is reversed'its contacts simul- J taneously energize the switches I6 and ll of the motor 4 and the switches 20 and 2| of the motor 5 as well as the solenoid 8 of the magnetic clutch, whereby the two motors operate as before but in a reverse direction.

The leveling controller 24 is constructed like the master controller. It is arranged in connection with the two motors, however, so that when its drum is thrown in one direction the switches l5 and I8 of the motor 4 and the switches 20 and 2| of the'motor 5 will be closed, the solenoid 8 of the magnetic clutch remaining unenergized. Thus, the two motors will simultaneously operate in opposite directions so that the pressurescrews 2 and 3 are simultaneously driven in opposite vertical directions. When the drum of this ,controller is thrown in the opposite direction the reverse effect is secured. That is to say, the descending pressure screw is now the ascendingone, while the opposite applies to the other.

From the foregoing, it will be seen that the invention essentially contemplates the provision of 50 control means for the motors 4 and 5 which is operated in a simplified manner by a. unitary manual control in each instance. This enables one man to quickly set or adjust the pressure rolls of the mill both before rolling and while 55 rolling. He may stand in a position where he can observe the relative positions of these screws and rapidly secure the setting desired by proper manipulation of the control handles of the master and leveling controls, he having a handon each. It is to be understood that these controllers are of the conventional type with small pistol grip handles at their tops, each easily manipulated with one hand.

The invention is believed novel in that it provides a means for leveling the pressure rolls of a mill quickly by simultaneously raising one of the movable rolls ends while lowering the other. It also provides a means for raising and lowering this roll while maintaining its parallel relationship with the others.

A more detailed descriptionof the circuits of the wiring diagram and the operation involved follows:

' tacts a circuit is formed from the line 9 through lines l5 and I8, the solenoids of the switches l5 and I8, line Illand so to the line Hi. This causes the contacts of the stitches l5 and I8 to close so that a power circuit is established from the line 9 through the resistances ll, series braking field l3, series field 4 and armature 4 of the motor 4, and so to the line In. This causes the motor 4 to operate. Also, a circuit is simultaneously formed from the line 9*, through lines I9 and 22*, the solenoids oi the switches l9 and 22, line Ill and so tow the line III. This closes the con tacts of the switches l9 and 22 and forms a power circuit from' the line 9 through the resistances.

i2, series braking field l4, the series field 5 and armature 5 of the motor 5, and so to the line I. This causes operation of the motor 5 in the same rotative direction as that of the motor 4.

When the master controller is operated so that the right-hand contactors contact the fixed contacts, a circuit is formed from the line 9 through lines It and m, the solenoids or the switches -IG and I1 and throughthe line It to the line "L This causes the contacts of the 'switches l6 and I] to close and form a power circuit from the line 9 through the resistances II, the series braking field |3,.the series field 4 and armature 4 of the motor, and so to the line In. This again causes operation of the motor 4 but in a reverse rotative direction to that which was obtained when the left-hand contactors contact the fixed contacts. Also, a circuit is simultaneously formed from the line 9, through the lines 2|) and 2|", the solenoids oi the switches 20 and 2| and so through the line I to the line [0. This causes the contacts 20' and 2| to close and form a power circuit from the line 9 through the resistances |2, the series braking field I4, the series field and armature 5 of the motor 5, and so' to the line III. This again causes operation of the motor 5, this, however, also being in a reverse direction to that obtained when the lefthand contactors contact the fixed contacts of the controller 23.

The manually operable contactors of the leveling controller 24 connect with the line 9 by way of a line 9'. These contactors are also shown out of contact with the fixed contacts.

when the right-hand contactors 0! this levelcuit is simultaneously formed through the lines 5 211 and 2 l the solenoids of the switches 20 and 2| and so, through the line 10 to the line III. This causes the contacts of the solenoids l5 and i8 to close so that the previously described power circuit effects operation of the motor 4 in the 10 same direction as occurs when the master controller 23 is operated so that its left-hand contactors contact the fixed contacts. Simultaneously it causes the contacts of the switches 20 and 2| to close so thatthe previously described power circuit effects operation of the motor 5. This motor, however, operates in the direction it does when the right-hand contacts of the master controller 23 contact the fixed contacts of this controller. Hence it will be seen that although the leveling controller 24 also efiects simultaneous operation of the motors 4 and 5, these motors operate in opposite directions.

When the left-hand contactors of the leveling controller 24 contact the fixed contacts of this 25 controller, a circuit is formed through the lines IG and' ll, the solenoids of the switches l6 and I1 and so to the line I!) through the line Ill This causes the contacts of the switches l6 and H to close so that the motor 4 is powered by the circuit previously described. Also, a circuit is simultaneously formed through the lines l9 and 22', the solenoids of the switches l9 and 22 and so to v the line H! by way of the line III". This causes the contacts of the switches l9 and 22 to close 85 so that the motor 5 is also operated by the circuit which has been previously described in connection with these particular switches. It is to be noted that here again the two motors are simultaneously operated in mutually reverse di- 40 rections.

When either of the groups of the contactors of the master controller 23 are closed with the fixed contacts of this controller, a circuit is formed from the line 9'- through the line 8, the solenoid 8 of the electro-magnetic clutch 8 and so to the line III. This causes the clutch to operate and interconnect the two motors 4 and 5 so that they are mechanically forced to operate at the same speeds- This circuit is not established upon operation or the leveling control 24.

Hence the clutch remains inoperative during leveling operations.

I claim:

1. A rolling mill including the combination of a set of rolls, at least two screws arranged to apply pressure to the opposite ends of said set, at least two electric motors one of which is geared to one 01 said screws and the other of which is geared to the other of said screws, and means for energizing said motors, said means including a controller providing a manually operable operating member that is movable in at least two directions and which is so constructed and so arranged in circuit with said motors that movement of said member in one direction effects simultaneous operation of said motors in opposite directions, whereby said screws are simultaneously driven in opposite directions, while movement of said member in another direction effects simultaneous operation of said motors in opposite directions which are .the reverse of the directions in which they were operated upon movement of said member in the first named direction, whereby said screws are simultaneously driven in opposite directions which are the reverse of the directions in which they were'driven upon movement of said member in the first named direction, said means being characterized in that it efiects the named operations continuously as long as said member is moved in either of said directions regardless of the extent said screws are driven.

2. A rolling mill including the combination of a set of rolls, at least two screws arranged to apply pressure to the opposite ends of said set, at least two electric motors one of which is geared to one of said screws and the other of which is geared to the other of said screws, and means for energizing said motors, said means including a controller providing a manually operable operating member that is movable in at least two directions and which is so constructed and so arranged in circuit with said motors that movement of said member in one direction effects simultaneous operation of said motors in opposite directions,

whereby said screws are simultaneously driven in opposite directions, while movement of said member in another direction efiects simultaneous operation of said motors in opposite directions which, are the reverse of the directions in which they were operated upon movement of said member in. the first named direction, whereby said screws are simultaneously driven in opposite directions which are the reverse of the directions in which they were driven upon movement of said member in the first named direction, said means being characterized in that it efiects the named operations continuously as long as said member is moved in either of said directions regardless of the extent said screws are driven, and being further characterized in that it effects acceleration of said motors to their top speeds whenever said member is moved in either of said directions.

LAWRENCE S. DAHL.