US1866232A

US1866232A - Rolling mill

Info

Publication number: US1866232A
Application number: US572386A
Authority: US
Inventors: Sykes Wilfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-10-31
Filing date: 1931-10-31
Publication date: 1932-07-05
Anticipated expiration: 1949-07-05

Description

W. SYKES ROLLING MILL lJuly 5, 1932,.

Filed oct.' 31,

1931 4 Sheets-Sheet l w. sYKEs 1,866,232-

July 5, 1932.

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mw l L L L www Patented July 5, 1932 UNITED STATES WILFRED SYKES, CHICAGO, ILLINOIS ROLLING MILL Application led Octcber 31, 1931. Serial No. 572,386.

My invention relates more particularly to rolling mills for cold rolling strips or bands of metal.

It is generally necessary inthe cold rolling of strips of metal by two or more mills in tandem to maintain a definite uniform tension in the stri between the stands to roll the strip to uniform gage as a variation in the tension with the same settin of the rollswill cause a variation in gage o the finished material.

My primary object is to provide mechanism which will operate automatically to render the tension in the strip between the stands uniform and of the desired degree.

` Referring to the accompanying drawings:

Figure 1 is a plan view of a rolling mill `comprising two stands and embodying my invention.

Figure 2 is a fragmentary sectional view of the mill, the section being taken coincident vwith the strip shown in position in the mill.

Figure 3 is a plan sectional ldiagrammatic view of the ymill showing the various elec- 15 i trical connections of the mechanism controlling the tension of the strip; and

Figure 4, a diagrammatic view of the electrical devices used in the control referred to and their electrical connections.

Referring to the particular construction shown, the rolling mill comprises two stan d s 5 and 6 of rolls the intermediate ones of which are represented at 7 and 8, these sets of rolls being driven, in accordance with common practice, by means of electric motors 9 and 10, respectively, in driving relation' thereto through reduction gear mechanism representedat 11 and 12, respectively, the rolls 7 rotating in one direction and the rolls p8 in the opposite direction.

The stands 5 and 6 are spaced apart, the strip which is rolled between the

rolls

7 and 8 and represented at 13,v spanning the space between the stands and traveling from `the right to the left in Fig. 1.

The mill comprises means whereby the'tension in the strip 13 between the stands is maintained uniform, these means operating` in the event oftendency of the rolls of the 5 stand 6 to decelerate or the tendency of the rolls of stand 5 to accelerate, in either of which events the tension in the strip 13 would be reduced, to increase thespeed of the rolls of stand 6 to restore the desired predetermined tension in the strip; and in the event of the tendency of the rolls of stand 6 to accelerate or of the rolls of stand 5 to decelerate, in either of which events the tension in the strip 13 would be increased, to ldecrease the-speed ofthe rolls of stand 6 and restore (so the desired predetermined` tension in the strip. "j

These means according to the preferred illustrated embodiment of the invention, comprise a yoke 14 secured to a. shaft 15 journaled` 65 in the frame of the stand 5, the yoke14 eX- .tending into the space between the stands and having a roller 16 journaledl in the arms of the yoke and adapted -to bear against the underside of the strip 13 in the movement of the latter through the stands. The shaft 15 is provided with a lever 17 rigid therewith and having at one end a counterweight 18 tending to rock the shaft 15 in a direction lfor forcing the roller 16 upwardly against the strip 13, the lever 17 at its opposite end connecting with the stem 19 of a fluidoperated piston and cylinder mechanism the cylinder of which is represented at 2() and provided for the purpose of rocking cm the shaft 15 in counterclockwise direction to lower the roller 16 when desired.

The'shaft 15is also provided with an arm 21 connected by a link 22 with .the contact arm 23 of a potentiometer rheostat 24, the link 22 being formed of longitudinally adjustable sections.v The arm 23 is rotatably mounted between its ends as represented at 25 to slide at its

ends

26 and 27, insulated from the central portion of the arm byinsulating material represented at 28 and 29, along contact strips 30 and. 31, respectively, and along series 32 .and 33 of stationary contacts interposed at intervals in the resistance coils 34 and 35, respectively, of the rhcostat 95 24.

The rheosvtat 24 is in circuit, as hereinafter described, with a small shunt Wound motor 36 the armature shaft 37 of which drives a Worm 38 which meshes with a. worm wheel 10o 39 to which the movable contact arm 40 of a rheostat 41 is connected, the outer end portion 42 of the arm 40 and insulated from the remainder of this arm by insulation represented at 43, sliding along a contact ring 44 and along a series of stationary contacts 45 interposed at intervals in the resistance coils 46 of the rheostat 41 which latter is connected with the ield winding 47 of the motor 10 which drives the rolls of the stand 6.

The circuit connections of the various electrical contacts are as follows: The line wires are represented at 48 and 49.

Wires

50 and 51 connect the terminals of the commutator of the motor 10 with the line wires.

of the terminals of the lield 47 of motor 10 connects with the line wire 49 by a line wire 52, the other terminal of field 47 being connected with one of the terminals of the resistance coil 46 by a wire 53 the other terminal of which connects with line wire 48 by a wire 54. -The commutator terminals of motor 9 connect, by wires 55 and 56, with the

'line wires

48 and 49, respectively, and the fieldl terminals of this motor connect with the

wires

48 and 49 by wires 57 and 58, respectively.

The lield winding 36a of the shunt motor 36 connects by

wires

59 and 60 with the

line wires

48 and 49, respectively, and the commutator terminals of this motor connect, by wireslfand 62, with the contact '

bars

30 and 31,; respectively. The adjacent ends of the resistance coils 34 and 35 are connected together by a wire 63, this wire being connected, by a wire 64, with line wire 49. The other ends of the coils 34 and 35 connect, by a wire l 65 with the other line wire 48.

The-operation of the apparatus is as follows: With a given Size of counterweight 18 suicient to cause the roller 16 to press against the underside of the strip 13 with the necessary orce for producing the desired tension in this strip, the sections of link 22 are adjusted to cause the contact arm 23 to assume the neutral position shown in Fig. 4. l

Should the motor 10 increase in speed and thereby tend to increase the tension in the strip 13 the pressure of the strip against the roller 16' will lower the latter thereby rockingFthe yoke14 in counterclockwise direction in ig. 1 and cause the contact arm 23 to assume such a position relative to the resistance coils 32 and 33 that voltage will be applied to the armature of motor 36 driving this motor in a direction to shift the rheostat arm 40 into such a position that the resistance in the circuit of field 47 of motor 10 decreases, thus slowing down the motor to a speed relieving the excess tension in the strip 13, the roller 16, yoke 14, and contact arm 23, returning to their original positions. The same operationas that above described would take place in the event that the speed of the motor 9 decreased, the increased tension in the strip One 13 re-acting against the roller 16 and causing a slowing down of the speed of the motor 10 to restore the original tension in the strip.

Should the speed of the motor 10 become decreased relative to thev speed of the motor 9 or the speed of the motor 9 become increased relative to the speed of the motor 10, the roller 16 will assume a higher position thereby moving the contact arm 23 into such a position relative to the resistance coils 31 and 32 that voltage will tbe applied to the armature of motor 36 driving this motor in a direction to shift the rheostat arm 40 into such a position that the resistance in the circuit of field 47 increases and speeds up the motor 10 to restore the original degree of tension in the strip 13.

As will be understood, the tension on the strip 13 may be regulated either by adjusting the position of the counterweight 18 on the arm 17, or by selecting a counterweight of the desired size, or by adjusting the linkage between the shaft 15 and the contact arm 23, as 'by relativelyl lengthwise adjusting the sections of the link 22.

When more than two stands of rolls are employed it would be desirable to provide strip tension regulating means as described for cooperation with the strip between each adjacent stand. Thus assuming that three stands of rolls are employed the third one being located to the left of the stand 6 in F ig. l, the controlling mechanism for the motor 10 and involving the potentiometer rheostat 24 together with the means for actuating it responsive to variations in tension in the strip 13 and the rheostat 41 controlled by the motor 36, in turn controlled by the potentiometer rheostat 24, would be duplicated for the motor of this third stand of rolls. In other words, for each additional stand, control mechanism as above described would\be provided for controlling the motor driving the rollers of the stand.

While I have illustrated and described a. particular construction embodying my invention, I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is: v

1. In a rolling mill, the combination of a. plurality of roll stands through which the strip beingl rolled passes in succession, drive means for said stands, respectively, and means controllingl the speed of operation of one of said drive means relative to the other of said drive means to maintain the degree of tension in the strip between said stands substantially a constant comprising a movable member adapted to bear against a face of the strip, a potentiometer rheostat controlled by said movable member, a second rheostat 'controlling the speed of operation of the said controllable one of said drive means, and means controllable by said potentiometer rheostat for controlling said second rheostat.

2. In a rolling mill, the'combination of a plurality of roll stands through which the strip being rolled passes in succession, drive means for said stands, respectively, and means controlling the speed of operation of one of said drive means relative to the other of said drive means to maintain the degree of tension in the strip between said stands substantially a constant comprising a movable member adapted to bear against a face of the strip, a potentiometer rheostat controlled by said movable member, a second rheostat controlling the speed of operation of the said controllable one of said drive means, and a motor controllable by said potentiometer rheostat for controlling said second rheostat.

3. In a rolling mill, the combination of a. plurality of roll stands through which the strip being rolled passes in succession, electric motors operatively connected with rolls of said stands, respectively, for operating said rolls, and means controlling the speed o o eration of one of said motors relative to Jt e other thereof to maintain the degree of tension in said strip between said stands substantially a constant comprising a movable member adapted to bear against a face of the strip, a potentiometer rheostat controlled by said movable member, a second rheostat controlling the'speed of operation ofthe said controllable one of said motors, and means controllable by said potentiometer rheostat for controlling said second rheostat.

4. In a rollingl mill, the combination of a plurality of roll stands through which the strip being rolled passes in succession, electric motors operatively connected with rolls of said stands, respectively, for operating said rolls, and means controlling the speed of operation of one of said motors relative to the other thereof to maintain the degree of tension in said strip between said stands substantially a vconsta-nt comprising a movable member adapted to bear against a faceof the strip, a potentiometer rheostat controlled by said movable member, a second rheostat controlling the speed of operation of the said controllable one of said motors, and a motor controllable by said potentiometer rheostat for controlling said second rheostat.

WILFRED SYKES.