US2337017A - Apparatus for stripping metal rolls - Google Patents

Description

- 1943- F. F. HlLLlX ETAI. 2,337,017

APPARATUS FOR STIPPLING METAL ROLLS AND THE LIKE iginal Filed Aug. 14, 1941 2 Sheets-Sheet l v //V VE N TORS F0575? E HILL/X and FPEDER/C u. LEACH, (0565/4550) ANN/1 MLEA CH (XECUTR/X) 14, 1943. F. F. HILLIX ET AL 2,337,017

APPARATUS FOR STIPPLING METAL ROLLS AND THE LIKE Original Filed Aug. 14, 1941 2 sh ts-Sheet 2 INVE N TO/? 8 FOSTER F HILL/X and FREDERIC J. LEA Ch, (015654550) A/V/VA M. LEACH (EXECUTR/ Patented ec. E4, 1943 APPARATUS FOR STRIPPING METAL ROLLS AND THE LIKE Foster F. Hillix, Lakewood, Ohio, and Frederic J. Leach, deceased, late of Parma, Ohio, by Anna M. Leach, executrix, Lyons, N. Y., assignors to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Original application August 14, 1941, Serial No. 406,932. Divided and this application June 18,

1942, Serial No. 447,576

6 Claims. (Cl. 76-4) Our invention relates to improvements in apparatus for stipple finishing cold rolling rolls of the character employed for producing stippled strip or sheet suitable for bonderizing, enameling or varnishing, this application being a division of our pending application Serial No. 406,932, filed August 14, 1941.

It is a prime object of our invention to provide for stipple finishing cold rolling rolls, to produce throughout the surfaces thereof, minute sharply defined indentations and crests affording a proper tooth to impart the uniform pattern thereof to the metal rolled by said rolls.

We have in view to provide for maximum localization of the surface treatment in order to minimize retreatment or overlapping of the roughening of the roll s'urfacathereby contributing to the production and control of the desired formation of sharp indentations and crests in the resulting stippling, and also to provide for minimizing the amount of metal stock worked on and removed from the roll surface. 7

The invention further contemplates the use of a granular cutting medium or abrasive impressed or forced into the roll surface bya constant static direct force or pressure, enabling the' employment of considerable power, limited only by the crushing strength of the granular abrasive.

Other objects are to provide an improved apparatus readily adaptable to the use of different sized granular abrasive or cutting medium to vary the character of the resulting stippling; to pro vide for uniform treatment of the roll surface by following the contour thereof; to provide for the accurate and sensitive control of the applied stippling treatment; and to provide apparatus capable Of economical and efficient operation for the stated purposes.

Additional objects and advantages will become apparent from the following description taken in connection with the accompanying drawings, wherein:

Fig. 1 is a diagrammatic plan view illustrating the apparatus of our invention;

Fig. 2 is an enlarged plan view of the abrasive applying means of Fig. 1;

Fig. 3 is a side elevation of Fig. 2;

Fig. 4 is an end elevation of Fig. 3;

Fig. 5 is an enlarged view of a portion of Fig. 3, particularly showing the mounting of the abrasive pressure roller;

Fig. 6 is a cross section taken on the line VI-VI of Fig. 5; and

Fig. '7 is a detail view showing the abrasive feeding device.

Referring to the drawings, the roll R to be treated in the manner and by the means of the present invention is initially finished by grinding to a high degree of smoothness with the desired crown and contour. The said roll is then placed in a lathe-like device, such as for example, the roll grinder diagrammatically illustrated in Fig. 1 including a power driven chuck or head 2 and a tail stock 3 mounted upon a suitable bed or base 4.

At one side of the grinder or lathe, we provide a movable support or traverse guide parallel with the roll axis, in the form of a shaft 5 slidably mounted in bearings 6 on suitable vertical pedestals or posts indicated at 1, said shaft preferably being located at an elevation well above the roll axis. A horizontal brace 8 preferably connects the housings of bearings 6 and is spaced from the shaft 5, thus providing arigid assembly for mounting and supporting the stippling unit S of our invention for movement thereof in a direction axially of the roll R being treated.

The stippling unit S is designed and operable to apply a hard abrasive to the roll surface by localized static pressure in such a manner as to form sharp well defined surface indentations and intervening crests in the roll surface without elongation or scratching, whereby the roll surface is eiliciently and uniformly stippled throughthe peripheral travel of the roller and roll will be equal, we prefer to apply power to one of said members only and drive the other therefrom in the manner of an idler, sufficient pressure being supplied therebetween as to maintain said members in rolling contact without slipping.

Since the roll R may be readily driven by means of the apparatus on which it is mounted, as illustrated in Fig. 1, we have found it expedient, to employ the abrasive pressure roller 9 as the idler member deriving its motion from the roll, and also have provided for the application of the desired static pressure to said roller 9.

Referring to Figs. 5 and 6, the roller 9 is provided with horizontal trunnions l0 rotatably mounted in bearings I l and I2 respectively disposed in an enclosing housing l3 and a cover plate M therefor. Housing I3 is cut away and open at one side I5 thereof to expose a portion of the periphery of the roller 9, and is provided with oppositely disposed pivot arms l6 in the plane of the roller. Arms l6 terminate in aligned trunnions I 1 rotatable in bearings iii in the spaced portions of a bifurcated yoke IS, the common axis of the trunnions I! and their bearings being at right angles to that of the roller 9 and tangent to the periphery thereof.

For the purpose of renewing the roller 9, the same may be constructed as shown in Fig. 6, including a replaceable rim 9a of hardened material bolted to the roller proper. For example, the said rim may be made of tungsten carbide. In order to effect such replacement,-the cover l4 may be removed from housing I! and the roller bodily removed from said housing, without disturbing other portions of the apparatus. The interior of housing l3 may be connected with a suction hose or the like, as by a provided opening 20 at one side thereof, in order to remove dust and abrasive and prevent injury to the bearings II and I2.

A trunnion 2| is prov ded on the base member of the yoke I! at an elevation s ht y above the axis of the roller and at ri ht angles to the axis of the trunn ons ilv sai trun ion 2| bein pivotally mounted by a bearing 22 in a hub 23 of a b furcated arm or f k 24 rotatab v de ending from and support d by the shaft 5. as shown in Figs. 2. 3 and 4. T us, by means of the fo k 24. the roller 9 may be swun about the shaft 5 into enga ement with the ro l R. the trunnions I1 and 2| prov ding a universal mount ng for the roller to enable the same to follow the contour of the surface of the roll R.

In order to advance the roller 9 into contact with the roll R and exert a suitable constant pressure on the latter by said roller, we provide a weight arm 25 pivotally mounted on the .shaft 5 and having adjustable weights 26 on the free end thereof, said arm normally extending horizontally over and resting on a suitable support, as for example, the brace 8 extending between the pedestals I.

Disposed diagonally between and connecting the arm 25 and fork 24, we provide a hydraulic piston and cylinder, the cylinder 21 being pivotally connected to the under side of arm 25 as at 23, and the piston being pivotally connected by its extending rod 29 with the hub 23 of the yoke II, as at 30. With the arm 25 at rest upon the brace 3, the hydraulic piston and cylinder are contracted to withdraw the roller 9 and its yoke away from the roll R, as. when mounting or removing said roll from the apparatus.

To apply the roller 9 to the surface of roll R,-

the hydraulic cylinder 21 and its piston are extended, thereby first engaging roller and roll, and then elevating the arm 25 above the support 3. With the arm 25 in the latter position, the weights 23 thereof will exert a constant static force upon the roller 9 in proportion to said weights, the hydraulic cylinder and piston forming and maintaining a connecting link between the weight arm. fork 24 and its yoke l9.

With the roller 9 so engaged with the roll R under a constant applied Static pressure, a dry granular abrasive is applied to the bite between the roll and roller, as indicated at a in Fig. 7. Various types and sizes of abrasive may be employed, it being desired to use a hard material capable of withstanding considerable pressure. We have found fused alumina to be such a material, and since it is relatively inexpensive, it may be employed eiilciently and economically,

By reason of the fact that the roller 9 or its replaceable rim 9a is materially harder than the metal of the roll R, the applied force is transmitted through the abrasive to the roll surface, resulting in the abrasive cutting and forming indentations and producing intervening crests in the metal of the roll surface, thereby producing the desired stippled finish on the roll. The cold working of the metal of the roll is slight and produces an excellent tooth or roughness of the surface with the desired uniformity. The

line contact between roll and roller effects a desirable localization of the applied pressure so as to uniformly force the abrasive particles into the roll surface as the same pass between the roll and roller, such localization serving to prevent overlapping as the treatment progresses over the roll surface.

We have found that the said stippling treatment may be accurately controlled and regulated for the desired results by applying a pressure to the roller 9 limited only by the crushing strength of the abrasive, and that the pressure range thus made available is entirely suilicient to effect an adequate cutting deformation of the roll surface. Further, by varying the size of the abrasive, the character and degree of the resulting stippling may be varied as desired, and the abrasive pres-'- sure roller of our invention may be readily employed for a large range of such sizes.

It will be seen that by applying the abrasive in a. thin flat stream across the face of the roller 9,

the cutting zone is limited to the width of the roller face, and by imparting the necessary traverse to the roller mounting, the entire surface of the roll may be treated. For example, chains 3| may be provided, driven by suitable means, and connected to the assembled fork 24 and weight arm 25 at the shaft 5, to traverse the roller mounting on said shaft across the surface of the roll R, as indicated by the arrow in Fig. 1.

Suitable means may be provided for feeding the abrasive to the bite between the roll and roller. For example, a hopper 32 may be mounted upon the stippling unit S, as upon the arm 25, said hopper having a feed valve 33 controlling the flow therefrom to a flexible conduit 34. Conduit 34 connects a feed nozzle 35 mounted on the housing l3 immediately above the bite of the roll and roller, said nozzle including an adjustable control gate 36, the nozzle and gate coacting to deliver a uniformly thin flat stream or layer of abrasive transversely between said roll and roller.

From the foregoing description, it will be apparent that the abrasive is applied to the roll surface and forced thereinto by the applied radial normal pressure of the roller 9, the static uniform pressure of said roller serving to effect a nonslipping travel of the roller over theroll surface, thereby producing a sharp stippling action without scratches or elongated indentations.

Various changes and modifications are contemplated within the scope of the following claims.

We claim: a

1. A device for stippling metal rolls and the like, including a support, a member pivoted theremember for exerting the weight thereof upon the roller when the latter is engaged with the work,

' weight of the arm from the member, a contractible and extensible connection between the member and arm for moving the member to engage the roller with the work and elevate the arm above its support, to thereby transmit the weight of the arm to the member and roller, and an abrasive feeding device disposed adjacent the roller for feeding a granular abrasive tothe zone of contact of the roller and work.

2. A device for stippling metal rolls and the like, including an arm pivoted for swinging movement toward and away from the work surface, an abrasive pressure roller, means pivotally mounting said roller on the arm about a pair of substantially normal axes, one of said axes being substantially tangent to the roller periphery,

. means for exerting a constant static force urging the roller into contact with the work, and means for feeding a granular abrasive into the zone of contact of the roller and work.

3. A device for stippling metal rolls and the like, including an arm pivoted for swinging movement toward and away from the work surface, an abrasive pressure roller, means pivotally mounting said roller on the armabout a pair of substantially normal axes, one of said axes being substantially tangent to the roller periphery and l the other being disposed above the axis of saidroller adjacent the region of contact of the latter with the work, means for exerting a constant static force urging the roller into contact with the work, and means for feeding a granular abrasive into the zone of contact of the roller and work.

4. In apparatus of the character described, the combination with means for rotatablysupporting a. metal roll, of means for stippling the roll surfaceincluding an abrasive pressure roller, a universal mounting rotatably supporting the roller in rolling contact with the roll surface, means for exerting a constant static pressure upon the roller urging said roller into contact with said roll surface, said universal mounting permitting self-adjustment of the roller in response to the contour of the roll surface to thereby maintain substantial line contact between said roller and said surface, an abrasive feeding device for feeding a granular abrasive into the bite between the roll and roller, means for rotating one of thelatter. and means for effecting relative traverse of the roll and roller simultaneously with said rotation.

5. In apparatus of the character described, the combination with means for rotatably supporting a meta1 roll, of means for stippling the roll surface including an abrasive pressure roller, a universal mounting rotatably supporting the roller in rolling contact with the roll surface, a pivoted weight arm, means for selectively transmitting the weight of said arm to the roller mounting for exerting a constant static pressure upon the. roller urging the latter into contact with said roll surface, said universal mounting permitting self-adjustment of the roller in response to the contour of the roll surface to thereby maintain substantial line contact between said roller and said surface, an abrasive feeding device for feeding a granular abrasive into the bite between the roll and roller, means for rotating the roll, and means for traversing the stippling means axially of the roll simultaneously with said rotation.

6. A device for stippling metal rolls and the like including an arm pivoted for swinging movement toward and away from the work surface, an abrasive pressure roller, means pivotally mounting said roller on the arm'about a pair of substantially normal axes for free universal selfadjustment of said roller upon and in response to the contour of the work surface, means for exerting a constant static force urging the roller into contact with said surface, and means for feeding a granular abrasive into the zone of contact of the roller and work surface.

' FOSTER F. HILLIX. ANNA M. LEACH.

Deceased.

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