US1963781A - Roll polisher - Google Patents

Description

A. D. EVANS ROLL POLISHER June 19, 1934.

4 Sheets-Sheet 1 Filed May 24, 1952 A. D. EVANS ROLL POLISHER June 19, 1934.

Filed May 24, 1932 4 Sheets-Sheet 2 .lNVENTz? 1w W Mug" A. D. EVANS ROLL POLISHER June 19, 1934.

Filed May 24, 1952 4 Sheets-Sheet 3 HIIIIHU HHH Ill [ITIII A. D. EVANS ROLL POLISHER June 19, 1934.

Filed May 24, 1932 4 Sheets-Sheet Patented June 19, 1934 T UNITED- STATES PATENT OFFICE non. rousmm Archibald D. Evans, Warren, Ohio, assignor to The Wean Engineering Company, Incorporated, Warren, Ohioga corporation of Ohio I I Application May 24, 1932, Serial No. 613,168

cessful as a practical matter. The diiiiculties with My invention relates toan apparatus for continuously polishing the surfaces. of the rolls of a hot mill in order to preserve a smoothrolling surface thereon.

ness in the surface of the rolls which is cumulative and very soon prevents the turning out of material of satisfactory quality. It then becomes necessary to shut down the mill for the purpose,

of redressing or polishing the rolls. He'retofore, this has usually been done manually and requires a stoppage of the mill for about five minutes,

twice during every hour of operation. Thestoppage of production, however, is not the only objectionable feature of manual polishing. It is impossible to obtain a uniform reduction in the surface of the rolls and the result generally is excessive'scouring in certain' areas. When operation is resumed, therefore; the quality of the product is not good because of the roughness of the rolls resulting from manual polishing. The

roll surfaces, therefore,fare practically never in. 0 good condition, being roughened either by the repeated rolling of bits of oxide or by the polishing operation itself, which is intended to smooth the surface but actually introduces additional roughness because of the uncertainty of manual polishing.

The necessity for excessive scouring ofthe' rolls during manual polishing will be, obvious from the fact that during a thirty minute operating period, the rolls turning at the usual rate, will have made about nine hundred revolutions. For

the greater part of this time, the rolls are bearing one on the other, although they are separated when metal passes therebetween. While the rolls are in contact, any bits of scale from the roll surface orthe material being rolled will" be picked up by one roll, carried around, transferred to the other roll and carried around it repeatedly, roughening, the surface of both rolls at each turn. The excessive and cumulative 59 roughness thus produced'makes it necessary to scourthe rolls pretty deeply to remove the pits and rough spots. s

, Although it has been proposed heretofore to provide mechanical polishing means, no such means with which I am familiar has been sucprior mechanical polishers have been that they interfere with the orderly operation .of the mill,

prevent easy changing of the rolls, are so close to the housings. and mill spindles as to be in great danger in case of breakage of the roll, and have not been protected from the hot grease fall'- ing from the necks of the rolls, which is thus transferred to the material being rolled. Prior mechanical polishers, furthermore, have not been adjustable as to the degree of polishing' effort applied and have not permitted the application of continuous polishing to restricted" or localized areas along the roll barrel. characterized by difllcultyin changing polishing stones in'case of breakage and have prevented manualpolishing where necessary at infrequent intervals to remove very deep pits from the roll surfaces. i

I have invented a continuous roll polisher which successfully overcomes the disadvantages They have also been 70 of prior devices and is also characterized by additional features of novelty. In accordance with my invention, I mount a polishing stone for each roll of a two-high hot mill on a bar or shaft which is slidably supported in bearings mounted in the mill housings. Adjustable means are provided for applying torque to the bars to force the stones against the roll surfaces, as well as means for continuously reciprocating the stones throughoutthe fullwidth of the mill or a limited portion thereof only. The means for reciprocating the stones includes racks and pinions designed to permit rotation of the polisher bars as well as axial movement thereof. The polished bars are reciprocated by a reversing motor, and a reversing limitswitch capable of a plurality of adjustments controls, the motor for full width reciprocation of the polisher or operation thereof in a restricted zone. For a complete understanding of the invention, reference is made to the acthe scope of my broader claims'.' In the drawingst- Figure 1 is a side elevatiom with parts broken away, showing a'mill having the invention applied thereto; r i

Figure 2 is an end elevation;

\ Figure 3 is'a plan view;

Figure 4 is a sectional, view taken along the line IV-IV of Figure 1; Figure 5 is a partial end elevationto enlarged for causing the polishing stones to engage "theroll surfaces with the necessary pressure;

Figure 6 is a side elevation of the polisher bars showing the stones associated therewith;

Figure 7 is a partial sectional view along the line VII'V]I of Figure 8 a Figure 8 is an enlarged side elevation of a holder for the polishing stones; and

- Figure 9 is a partial view of the right-hand end of the mill as shown Figure 1, the polisher bars appearing in section, showing the application of manual means for forcing the polishing stone'against the roll surface.

Referring now in detail'to the drawings'a mill 10 comprises housings Hand 12 slidablymounted on bed rails 13. The housings 11. and 12 are provided with windows 14 in which are mounted bearings (not shown) for the mill rolls 15 and 16.

At one side of the windows 14 in the housings, a recess 17 is formed to receive a bearing plate 18 having 'slide bearings 19 for upper and lower polisher bars 20 and 21. The plates. 18 are secured to the housings by screws 22 and the bear-- ings are preferably disposed symmetrically above and below the horizontal plane passing through the bite of the rolls.

The barsj 20 and21 have arcuate teeth 23 sleeve 26' adapted to be'secured to the bars by screws 2'7, and a box28 trunnioned on the sleeve -26 by a pin 29. A screw 30 extending through a side of-the box, 28 secures the stone therein.

- The ends of the'bars 20 and 21 are counterbored and tapped. Extension sections 20a and 21a. may thus be screwed into the ends of the bars incase the mill is set up for a greater width of material, necessitating a wirler' traversing movement of the polishing stones to cover the entire roll surface; Bearing brackets 31 are mounted on the ends of the bars 20 and 2L and the extensions, if any. These brackets are illustrated best in Figures 5 and 6' and are supported on end rods 32 which screw into the ends of the bars inthe' same manner as the extension members 20a and 21a. The brackets 31 have arms 33 projecting away from the rolls at the level of the axis'of the bars 20 and. 21. Discs 35 are keyed to the reduced ends of the end rods 32. Chains. 36, including a link 37 secured to' the discs, pass I ,around the periphery thereof. One endof each of the [chains extendsto an adjustable spring sustained terminal 38'. The other end of each of the chains engages an adjustable terminal 39.

' The spring terminals 38 are slidably carried in fingers 40 projecting from the arms 33. Fingers 41 also extend outwardly from the arms 33 to provide a support for the terminals 39, which surfaces with diiferent degrees of pressure. Handles 43 on the terminals 39 and adjustin nuts 44 on the terminals 38 facilitate the variation of the pressure exerted by the polishin "stones.

In order'to give the polishing stones a traversing movement axially oftherolls 15, 16, I mount a gear box 45 on the housing 11. Shafts 46 journaled in anti-friction bearings 4.7 in the gear box 45 are provided with throat pinions 48 and driving gears 49. The throat pinionsmesh with the circumferential teeth on the bars 20 and 21 so that, in efiect, there is provided a; pair of racks.

- that rotation of the shaft50 in one direction causes simultaneous axial movement of boththe bars 20 and 21 in the same direction and to the same extent- Reverse rotation of the shaft 50 likewise reverses the axial movement of the bars '20 and 21.

' The shaft 50 is driven through a universal spindle 52 and a speed reducer 53, by a motor 54. The low speed shaft of the reducer 53 drives the high speed shaft of a reducer 55 and the low speed shaft of the reducer 55 'actuates a rotary limit switch 56 for controlling the-motor 54. The re ducers 53 and 55, the motor'54 and the limit switch 56 are mounted on a common base 157'. A

removable cover 58 shown in dotted. lines in Figure 2 may be placed o'n the base "57 to protect the apparatus supported thereon. The limit switch 56 may be of standard-design and is efiec-- tive, cooperating withisuitable relay's and con-.

tactors, for stopping and reversing the motor 54 when the polishing stones have reached the limits of their travel. Preferably, the switch 56 is adjustable so that difiereritranges of travel of the polishing stones can befutilized. Thus, if it is bars 20, 21, preferably adjacent the mill housing 7 12 and, by appropriate manipulation of the wrench, additional torque can be applied to the polisher bars so that the stones will engage the rolls .with greater pressure. pecially'usefulin grinding down deep impressions in the roll surfaces. Normally, of course, thestones are urged againstthe roll surfaces only by the pressure of the spring terminals 38.

The invention described is obviously characterized by numerous advantages, both over the prior practice of manually polishing mill rolls and also over mechanicalpolishers known to the prior art. In the first place, by operating the polisher of my invention continuously'or substantially so,

the roll surfaces are always maintained in good rolling condition and shutdowns or stoppages of the mill for the purpose of restoring a smooth surface on the rolls are avoided. The polishing operation, therefore, does not interfere with the normal mill'operation and permits high produc tion' speeds to be maintained continuously. The

apparatus can be readily removed for changing .ings.

rolls by releasing the holder sleeves 26, disconnecting the driving spindle 52and unscrewing the untootlied portions from the toothed portions of the bars ,20, 21. The untoothed portions of the .bars may then be-withdrawn from the mill hous- In addition'to the foregoing advantages, the

This feature is esoperating mechanism for the polisher is largely disposed remote from the housings and the mill spindle so as to avoid damage in case of roll breakage. The polisher bars, furthermore, are protected by their slide bearings from the grease falling from the roll necks. The bars, therefore,

- about their axes.

cannot carry such drippings on to the material" being rolled. The polishing pressure exerted on the rolls by the stones can very readily be adjusted, as previously explained, and it is also possible to vary the area in which polishing is eifected by varying the contacts of the limit switch. The

polishing stones themselves can be readily replaced in case of breakage or wear and manual polishing can be resorted to in case of deep marks, if desired. The throat type pinions driving the polisher bars are effective to give axial movement thereto without preventing rotation thereof The stone holder, being trunnioned to thereciprocating polisher bars, can shift so that the stone adapts itself to the position of maximum contact with the roll surface.

Although-I have illustrated and described herein but one embodiment of the invention, it will be obvious that'numerous changes'in the emboditorque on said bars to force the stones against the rolls, and means for reciprocating saidbars including throat type pinions and circumferential rack teeth on said bars engaged by said pinions- 2. A roll polisher for rolling mills, comprising stones against the rolls. means for exerting a a bar adapted to extend transversely of the mill,

a polishing ston mounted on'the bar for engaging one of the mill rolls, a disc secured to said bar, a bracket on the bar, a chain connected to said disc for exerting a torque on the bar, and a yielding anchorage on said bracket for one end of said chain.

3. A roll polisher for rolling mills including a shaft adapted to extend transversely of the mill, a polishing stone mounted on the shaft for engaging a mill roll, means for exerting a torque on the shaft to force the stone against the roll, and means for reciprocating said shaft comprising circumferential rack teeth thereon and a pinion meshing therewith.

4. A roll polisher for a rolling mill, comprising ashaft parallel to the axes of the millrolls, a

polishing stone mounted on the shaft for engaging one of the rolls, means exerting a torque on said shaft tending to rotate it about its own axis, and means for reciprocating the shaft including circumferential rack teeth thereonand a pinion having arcuate teeth meshing with said rack teeth.

5. The apparatus set forth in claim 2 charac- 4 terized by the fact that the other end of said chain is provided with retracting means, and securing means for the retracting means.

ARCHIBALD D. EVANS.

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