US1534860A - Mill for rolling tapered disks - Google Patents

Description

April 2l, 1925. 1,534,860

A. MARTIN uILL Fon ROLLING TAH-:RED nrsxs riginalriled May 26, 1922 4 sheds-sheet 1 April 21,1925. 1,534,860

A. MARTIN IIILL FOR ROLLING TAPERED D ISKS Original Fj, ]=ed )lay 26, 1922 4 Sheets-Sheet 2 April 21, 1925. 1,534,860

A. MARTIN IIIILL FOR ROLLING TAPERED DISKS 4 4 Sheets-Sheet 5 or1g1na1 rileaflmyV 2e, 1922 FIG; 5

FIG. 6 2

l 29'41 9am-w 5 J7 FIG 8 "1 NVENTOR April 21,1925. l 1,534,860 A. MARTIN HILL FoR ROLLING TAPERED DIsKs original Findlay 26, 1922 4 Smets-sheet 4 mvm lliatenteozl Apr. 21, 1925. 4

ARTHUR MARTIN, 0F PITTSBURGH, PENNSYLVANIA.

-PATENr'oF Fica.'-

MILL Foa" ROLLING TAPERED Disks.

Original application led Hay 26, 1922, lSerial No. 563,877. Divided and this application led J'une 21,

192s. serial no. Messo.

To QU whom z'tmay conce-7%.'

Be itknown that I, ARTHUR MARTIN, a citizen of the United States, and resident of Pittsburgh, in the county ofAllegheny and State of Pennsylvania, have invented a new and useful Improvement in Mills for Rolling Tapered Disks; and I do hereby declare the following to be a full, clear, and exact description thereof. My invention relates to the art of rolling metal, and it has special reference to the manufacture of tapered disks for automobile wheels and for other purposes.

` Another objectof my invention is to provide a rolling mill for tapered disks which shall be of simple and rugged construction, and shall employ frusto-conical rolls mounted and operated in an improved manner.

My improved rolling mill consists of two frusto-conical rolls mounted on shafts which preferably are mounted upright with their axes of rotation in a common vertical plane, and'having camfoperated means for feeding one of the rolls toward the other during the rolling operation. The movable roll is mounted in a novel manner for rocking upon an axis which is so arranged that the rocking movement of the roll shaft causes the movable roll to approach and recede from the fixed -roll in a substantially straight path'. The upper roll bearings and the cam mechanism for feeding the movable roll are all mounted in a ri id yoke of novel construction. The blan to be rolled is mounted on a mandrel within a housing which opens to receive and discharge theblanks, and is closed during the rolling operation, and I provide means for exhausting the air from the interior of the housing,y and also, if desired, for heating the interior of the housing near the periphery of the blank so as to produce non-oxidizing conditions within the housing, and also to heat the edge of the blank which isthe portion which cools most rapidly.

The general features just mentioned, together with other novel devices which contribute to the perfect operation of the Inachine, are shown in the accompanying drawing, in which Fig. 1 is aside view, partly in elevation and partly in section, of a complete rolling mi l constructed in accordance with my invention, showing the blank housing closed and a pair of blanks at the endof the rolling operation; Fig. 2 isan end elevational view of the same machine, partly 1n section on the line 2 2, Fig. 1; F ig. 3 1s a v iew, partly in elevation and partly in section, of one-half of the blank housing; Fig. 4 is a side elevational view ci the machine, with parts in section, showing the blank housing open; Fig. 5 is a plan view of the machine; Figf is another plan view, with the blank housing and its attachments removed; Fig. 7 is a bottom plan view of the bottom closure late for the blank housing; Fig. 8 is a etail vertical sectional view taken substantially on the line 8-8Fig. 7; Fig/9 is another detail vertical section taken substantially on the line 9-9, Fig. 7; Fig. 10 is a longitudinal sectional the rolls, showing the mannerr in which the roll is attached to its shaft; Fig. l1 is a longitudinal sectional View taken axially1 through the blank-supporting mandrel and its attachments; Fig. 12 is a. fragmentary sectional View showing one of the blank guide rollers; Fig. 13 is a diagrammatic side View of the roll-operating cam and the cam-reller; Fig. 14 1s a detail view. of one of the blank-positioning rods; Fig. 15 1s a frarmentary elevational view showing 'a modied form of heating device, and Figs 16 and 17 are sectional views taken on the lines 16-16 and 17-17, respectively.

In the drawing,.the numeral 2 indicates a rectangular base frame having depending ribs 3 which are spaced from the edge: of the base 2 to form flanges 4 upon which the mill may be supported upon a floor or other stationary support. Hangers 6 are formed beneath the base 2 and support bearings 7 for a drive shaft 8 which is driven from any suitable source of fpower, not shown, and which carries bevel gear wheels 9 and 10 meshing with bevel gear wheels 11 and 12 that are secured to the lower ends of inclined roll shafts 13 and 14 to the upper ends of which are secured frustoconical rolls 15 and 16.

A rigid yoke 17, suitably made of 'cast iron, or cast steel, and formed in one piece, is supported upon four standards 18 carried by the base 2. .The yoke 17 guides and supports the rolls with their operating mechanism, and also supports a housing composed of separable sections 19 and 20 in which the blanks are enclosed while being rolled.

view taken axially 'through one of The roll shaft 13 is mounted in a'bearing block 25 which is supported on a pivotvpin 26 carried by a slide 27` that is movable for adjustment on suitable ways formed in the base 2 and may be secured in its adjusted position by means of' bolts 28. The bearing block 25 is formed-at its upper end with a half-bearing 29 which is constructed like one-half of a mill-bearing of ordinary construction, and is also formed near its lower end with a half-bearing 30 which forms onehalf of a roller thrust bearing. The mill bearing at the upper end of this shaft is completed by a removable half-bearing 31 which is secured to the half-bearing 29 by means of bolts 32. The roller thrust bearing at the lower end of the shaft is similarly completed by means of ,la removable half bearing 33 secured to the bearing 30 by means of bolts 34. The angular position of the bearing block 25 is fixed by means of set-screws 35, Fig. 4, which extend through projections 36 formed on opposite rsides of the yoke 17 and which bear against the sides of the bearing block 25.

The sliding movement of the slide 27 and the angular movement of the bearing block 25 around its pivot 26, permits the roll shaft 13 to be adjusted at the beginning of a rolling operation, after which this roll shaft is fixed in position by means of the bolts 28 and the set screws 35. ledges 37 and 37a are provided to give a fine adjustment of' the angle of inelinationof the roll shaft 13.

The roll shaft 14 is mounted in a bearing block 40 which, like the bearing block 25, is provided with an upper mill bearing 41 and a lower roller thrust bearing 42. The bearing block 40 is supported upon a forked yoke 43 in the lower ends of which are formed bearings 44 which receive the ends of a pivot shaft 45 which is supported in bearings 46 carried by one of the hangers 6 of the frame. By this construction the roll shaft 14 and the roll 16 are permitted to swing around the axis of the pin 45, and since this axis'is disposed a considerable distance directly below the roll 16 thisroll moves toward and away from the roll 15 in.

a path which is nearly a straight line.

The upper mill bearings of the roller 1 shafts 13 and 14 are rectangular and fit within the rigid yoke 17 as best shown on Fig. 6. For the purpose of feeding the movable'roll 16 toward the fixed roll 15 and for' moving the roll 16 away from the vroll 15 after the rolling operation is completed, the bearing 41 of the movable roll 16 is provided with two extensions 50 in which is `journaled a heavy pivot pin 51 carrying a cam shaft 54 also carries a smaller cam o: for a purpose to be described below, and a worm wheel 58- for rotatingr the cam shaft 54 toproduce the proper feed of the roll 16. The worm wheel 58 meshes with a worm 59 carried by a shaft 69 which is mounted in bearings 6l on the under side ofthe bloc-k 55. gear 62 meshing with a bevel gear 63 on the upper end of' a vertical shaft 64 which is mounted in fixed bearings 65 supported upon one of the standards 18, and carries at its lower end a bevel gear 66 meshing with a bevel pinion 67 on the armature shaft 68 of an electric motor 69 which is mounted on a fixed bracket 70.

An adjustable wedge 71 isinterposed between the block and the end of the rigid yoke 17. It will thus be observed that when the rolls 15 and 16 are operating toproll blanks between them, all of the horizontal rolling thrust is taken up by the ends of the rigid 'yoke 17, and that this yoke, in addition, prevents lateral displacement of the rolls through .the close fit of the upper roll bearings in the yoke.

Fig. 10 shows the manner in which the rolls 15 and 16 are attached to the upper ends 0f their respective shafts. As shown in this figure, the upper end of the shaft. 13 is provided with aflange 75 above Which is a squared portion 76 of reduced area at the base of a conically tapered end portion 77 which is tapped to receive a s'tud bolt 78. The roll 15 fits over the squared and conical portions 76 and 77 and 1s provided with a countersunk opening to receive the stud bolt 78.

The housing which encloses the blanks during the rolling operation is composed, as stated above, of separable sections 19 and 20. The section 19 is composed of a semieireular casting 80 having horizontal flanges 81 which are bolted to corresponding flanges 82 carried by an arched casting 83, the lower ends of which are provided with flanges 84 which rest upon and are bolted to the opposite sides of the yoke 17. The casting 83 also carries a tubular mandrel bearing 84.

The movable housing section 20, like the fixed section 19, is composed of a semi-circular casting 85 having horizontal flanges 86 which are bolted to similar flanges 87 extending from the upper end of an areh'ed casting 88. The lower ends of the arched casting 88 are formed into flanges 89 which are slidably received beneath gibs 90 that are vsecured to the upper surface of the yoke 17. The casting 88 also carries a tubular mandrel bearing 91. Beneath the mandrel bearing 91 the end of the hollow casting 88 is closed-by means of a web 92 in which is secured an I-bolt 93 to whieh'is attached a wire rope 94, or other suitable flexible connector, which extends over a fixed pulley The shaft 60 also carries a. bevel 95 mounted vin bearings 96 and serves to suspend a weight- 97 which' tends to draw the movable 'housing section 20 away from the fixed section 19. When the cam'53 per-l mits such movement to occur, themovable roll 16 is caused to move with the housing section 20. For this purpose the extension 50 from the u per roll .bearing 41 is provided with a pm 98, the ends of which project beyond the bearing extension 50and are flattened to rest against a flat plate 99 which is carried by the sliding casting 88.

The housings 19 and 20 cooperate to form a circular space which encloses the blanks B while the blanks are being rolled. For this purpose the housing sections 19 and 20 are provided with 'opposed flanges 100 and 101, respectively, and the flange 101 1s pr vided with au extension 102 which telescopes within the flange 100. Opposed ribs 103 are formed on the inner sides of the housing sections 19 and 20 and cooperate with the flanges 100 and 101 to form afheating chamber within which are disposed two curved burners'104 which are sup lied with fuel gas or I oil, and with air or combustion, through pipe connections 105. The flanges 103 retain most of the heat from the burners 104 at the peripheral portions of the blanks and prevent overheating of the hu-b portions and of the mandrel on which the blanks are supported.

As shown in the drawing, two or more of the blanks B are rolled simultaneously', but while this is the most economical method the blanks may evidently be rolled one at a time, if desired. During the rolling operation the blank or pair of blanks is supported on a mandrel 110, the details of construction of which are omitted from the general views 1 and 4 for thesake of clearness. As shown in Fig. 11, the mandrel 110 is formedon the end of a'screw-threaded extension 110l from a shaft 112 whichis mounted-in' the tubuiaiaring 91 of the movable housing section 20. A mandrel hub 111 is screwed uponthe threaded shaft extension 110 and rests against a plate 111. moves horizontall with the-housing section 20, and when in t e Workin position shown on Figs. 1 and'll extends into a recess 113` The vmandrel 110 l formed in the end of a -screwfthreaded extension 113!I from a sha-ft 116 which is received inthe tubular bearing 84l carried by the fixed housing section 19.- A mandrel hub 115 is screwed upon the threaded shaft extension 113" and rests against a plate 115. The shafts 112 and 116 are prov1ded with ball bearings or rollerbearings 117 and 118 respectively. and are rotatedby the 'blank B as the blank is turned through its engagement between the rolls 15 and 16J For the purpose of cooling the mandrel 'hubs 111 and 115, these hubs are provided wit-h annular chambers 120 and 121, re-

spectively. The annular 'chamber 120 com municates through passages 122 with a horizontal passage 123 formed in the shaft 112 and communicating. with a similar passage 124 formed in a reduced extension 125 from the shaft 112. 'A tube 126 is screwed into the end of the reduced shaft section 125 and extends rotatably through a gland 127 which is supported in a fixed standard 128 and is provided with a tapped opening to which a pipe 129 is attached -for supplying or removing cooling fluid.

The chamber 121 in the mandrel hub 115 communicates through inclined passages 130 with a horizontal'passage 131 formed in the shaft 116 and communicating with a similar passage 132 in a reduced extension 133 of the shaft 116. A tube 134 is screwed into the end of the reduced shaft section 133 and and is provided witha tapped opening to which a pipe 137 is connected for supplying or removing fluid. 'A sliding rod 1 38 eX- tends throughthe openings 131. and 132 and through the tube 134 and projects into the recess-113 adjacent tothe mandrel 110. This rod carries a vrve member'139' which is contained in a recess 140 formed in the gland 135 and which is adapted to close the cnd of the tube 134. A spring 141 tends to force the valve member 139 against the end of the tube 134 and thus prevents fluid from flowing through the cooling system except when the rod 138 is moved tothe left, Fig. 11, by the mandrel 110. Such movement of the rod 138 carries the valve member 139 to the left against the compression of the spring 141 and opens the tube 134 for the flow ofcooling fluid.

CommunicationV between the cooling chambers 120 and 121 is effected by means oipassages 142 and 143. The passages 142 place the chamber 121 in communication with the recess 113 which is made deeper than the mandrel 110, 'while the passages 143 lplace the annular chamber 120 in communication with the recess 113. If the pipe 137 is connected to -a source of water-or other cooling fluid, the water lcannot flow t past the valve member 139 until the mandrel 110 pushes the rod 138 and the valve member kbearings to form a substantially air-tight other and with the roll shaft lever 174.

means/lof a plate 145, Figs. 1, 4, 7, 8 and 9.

'The plate 145 is `bolted to the underside of nism. In order to keep the lower portion of the housing closed while the rolls are separated, the plate 145 carries a slide 148, tliev right-handedge of which bears against the under side of the movable bearing block 40.'

As shown in Fig. 7, the slide 148 is provided with parallel slots 149 through which extend stud bolts 150 received in the plate 145. The plate 145 and the slide 148 are provided with semi-circular recesses forming spring seats 151 in which are received compression springs 152. The rear or lower ends of the springs 152, as shown in Fig. 9, rest against projections 153 which are carried by the plate 145 and which are received in extensions from the spring-seat recesses in the slide 148. The upperor forward Aend of each spring 152 rests against a? shoulder 155 formed in the sliding plate 148. The springs 152 thus tend to force the slide.to the right as seen in the -draw1ng, and when the bearing block 40 is rocked around the.

axis 45 to withdraw the roll. -16 from the roll 15, the slide 148 follows the bearingv block and keeps the under side of the blank housing closed. 4 0

For the purpose of properly positioning the blanks with respect to the mandrel 110, I provide two rods 160 which extend slidably through openings in the rear of the housing. casting 83 and are attached to levers 161 which depend from a rock shaft 162 that is mounted in fixed bearings163. One end of the rock shaft 162 carries a lever 164 which is provided with a pin 165 received in a fork 166 which is rigidly secured to a horizontal rod 167 slidably mounted in iixed bearings 168 and 169. forked member 170 in which is received a pin 171 carried by a lever 172 which is secured to a rock shaft17 3 that also carries, a The lever 174 carries a cam roller 175 running upon the periphery of the'small cam 57 which, as stated above, is secured to the -shaft 54 which carries the main roll-operating cam 53. A spring 176v surrounds the rod 167 between the bearing 169 and the fork 17 0, and tends to move the shaft 167 to the 1eft,as seen in the drawings, against theaction of the cam 57. When the cam 57 moves the cam roller 17 5 to the left, Fig. 1, this movement is communicated The rod 167 also carries av through the lever 174, the rock shaft 173, the lever 172, and the pin 171 to move the rod 1 67 to the right, Fig. 1, compressing the spring 176. r1`his movement is communicated through the fork 166, lever 164, rock shaft 162 and levers 161 to move. the rods 160 to the right, Fig. 1, thus bringing the inner ends of these rods into position to receive the next blank or pair of blanks that is to be rolled. VThe inner ends ofthe rods 160 are rovided with notches in order to engage t e edgespf the blanks, as shown -in Fig. 14, and are so positioned that when the blank or pair of blanks rests upon the two rods 160 the central opening in the blank o1' pair of blanks is in proper posi- "tion to admit the mandrel 110.

For the purpose of removing the iinished ,disks from the. mandrel 110 after the rolling operation, 'I provide two stationary pins 180 which are adjustably carried by fixed standards 181 thatv are bolted to the gibs 90, as shown in Fig. 2, and are connected by means of a stirrup 182. These rods 180 extend through openings in thel movable housing section 20 in proper position to engage the disks and prevent them from moving further, with the mandrel 110 as the mandrel movestothe right in the drawing.

The mandrel shaft 112, with its roller bearing 117, is so arranged as to slide to a limited extent within the tubular bearing casting 91, and is normally forced tothe left by means of a compression spring 185 which is contained within an enlarged extension 186 of the tubular bearing 91. One end of the spring 185 rests againstthe end 'of thevmandrel rollerbearing 117 and the 188. The plug'is suitably bored to receive the water-cooling attachments shown in Fig. 11. By turning the hand wheel 188 the compression of the spring 185 may be varied with corresponding variation in the pres- Sure with which the mandrel 110 is forced to the left. W'hen the'mandrel hub 11.1 is closed upon the blanks B the mandrel shaft 112 moves slightly to thev right within its bearing. and this movement' is cushioned by the spring 185. The spring 185 4also provides an adjustment for differences in the diameter of the rolls when the rolls arej returned from time to time. A v

In order to avoid marringthe blanks when the blanks are placed upon thereeeiving rods 160, and also to avoidmarring the finished disks when the disks are ,removed from the machine, I provide guide rolls 190 mounted on pins 191 which are loosely carried in bearings formed on the inner walls of the housing sections 19 and 20, as shown in Figs. 2, 3 Aand 12.

u contact with the roller 52 the roll-16 isfed When the machine 4described above is toy be operated to' roll disk from "circular blanks,the blanks are heated in a suitable-A furnace `and are delivered from thefurnace, either by automatic .feeding"means cry-by hand, and placedv singly orfin pairsfupon the receiving rods 160 which, .atthisfjftime,

have been movedby thetcam 57 and thefon,

position shown in Fig. 4. At

housing section 19 andthe roll rated with lthe roller 52 and thus rocks ,thebear# ing block of the roll 16 around'thegpivot shaft 45, thus moving the roll 16 in sub- Santiauy straight une toward thans-11 415- until the blank is gripped'betweenthe rolls.

This movement is communicated 'through' the'pin 98 to the `sliding housingseotion 20, and the housing is thus vclosed faround the blank and. the mandrel 110 is caused to pass through .the central opening thelank. Thereupon the camf 57v`operates to withdraw the rods 160'1ro1nl .beneath the blank, leaving the blank free to increase in diameter as the rolling operation proceeds'.v

As soon as the housing is closed aroundl the blank the suction means connected to the outlet 147 operates to exhaust the air from the interior of the housing. .,The'. flames of the'burners 104fvhelp to remove oxygen from within the housing anda non-oxidizing atmosphere is quicklyvestablished there-4 in, which prevents, or,v atfleast greatly re'- duces, the formation of'scaleon the blanks during the rolling operation. Any scale which may be formed and which may be dislodged is carried away through the outlet 147.

It will be observed that the heat of the burners 104 is mainly confined to the periphery of the blanks which are the parts most quickly cooled when circular blanks are rolle-d in the open air, While at the same time the hub portions of the blanks are not overheated. This is particularly important when the finished disks are to be used as vehicle wheels, since overheating of the center portion of the disk would permit the center portion to be distorted by the .rolling forces.' The 'cooling of the mandrel hubs 111 and 115 also contributes to'keep the center portion of the disk from overheating.

The cam 53 `is formed witha continuously .increasing radius forming a spiral curve from the-point A to about the point C, Fig.

13, and while this portion of the cam is in gradually toward the roll 15. Between the point C and the point D the'periphery of u the cam is concentric so that the roll 16 n causes the sliding system worked may auses at the end of its feeding movement. etween the pointsD and Athe periphery of the camV is formed with a sudden drop E and a sudden rise F separated by -a concentric portion G, so that `block 40, is permitted to therlght, under the iniiuence of the eight 97,`-to the position shown in Fig. 4. After a pausey While the roller 52 'is in contact with the concentric portion G off the cam, the rising portion F y,again to move to the left. Between these slidingmovements the fin` ished blank is removed from the machine upon the` rods 160, vwhich meanwhile have beenmoved by the ca1n`55 into their blanklreceiving position.

That portion of-my invention which relates to theworking of metal in a non-oxidizing atmosphere, or in a partial vacuum, 1s not restricted to thel rolling of circular disks, vandit will be understood that this method may metal worklng operations. It will also be understoodthat the non-oxidizing atmosphere surrounding the metal during working may be produced bysimple suction, by suction 1n combinationwith reducing flames,

fas-,in the embodiment described above, or by surrounding the metal with non-oxidizing gas, such asnitrogen or carbon dioxide. The" 'casin within which the metal is e heated by means of electric heatingielements instead of by means of gas flames. One arrangement of heating elements and connections therefore is shown in Figs. 15,- 16 and 17, 'the housing or casting 85 is provided in its channel portion withv insulation material 201 upon which is placed retaining sheet 202 that may be of sheet metal. A plurality of bolts 203 surrounded by insulating bushings 204 are supported by the member 85.

Two bolts 205 and 206 provided with insulating bushings 207 are also supported by the member 85 and serve as terminals to the outer ends of which electrical conductors are connected. The inner ends'of the bolts .203 serve as a support for a ribbon of a resistance material 208, such as nichrome, that is passed around the insulating bushings 204 inthe manner shown in Figs.'15 and 16, the opposite ends of the resistance ribbon or wire being connected to the terminal bolts 205 and 207. The casting 80 may be provided with similar; heating elements. This application is a division of my copending application for Letters Patent filed May 26, 1922, Serial No. 563,877.

The structural details shown and described herein maybe varied in many re`- spects without departing from my invention,

when the point Dl :reaches the roller 52 the entire sliding struc- '.ture, including the housing section 20,' the A roll 16 and the bearing to.v withdrawv j and afresh blank or pair of blanks is placed 'be employed in many other the scope of which is indicated in the appended claims.

I claim as my invention: s

l. A mill for rolling disks comprising two shafts each of which carries at its end a conically tapered roll cooperating with a similar roll carried by the other shaft, a beveled gear wheel mounted at the opposite end of one of the shafts, a beveled driving pinion therefor, a pivotal support for said shaft disposedintermediate the ends thereof and having an axis extending transversely to the shaft, and means for adjusting said pivotal support in a direction parallel to the axis of said inion.

2. A mill or rolling disks comprising two cooperating and conically tapered rolls, shafts supporting said rolls and having converging axes, a beveled gear wheel carried by one of theshafts, a cooperating beveled drive gear for said gear wheel, and means for mountino one of said shafts for pivotal movement about an axis transverse to and remote from the axis thereof.

3. A mill for rolling disks comprising two cooperating and conically tapered rolls, a shaft for supporting one of said rolls, a slidable pivotal support for said shaft whereby it may be moved toward and from the other roll and is tiltable about an axis disposed transversely thereof, a shaft for supporting the second named roll, a beveled gear wheel carried by the last named shaft, a cooperating beveled drive gear for said wheel, and means for mounting said shaft for pivotal movement about an axis transverse to and remote from the axis thereof, the said shafts being rotatable about converging axes.

4. A mill for rolling disks comprising two cooperating and conically tapered rolls having their axes of rotation in a common vertical plane, inclined shafts supporting said rolls, and means for mounting one of said shafts for pivotal movement around horizontal axis beneath and substantially in vertical line with said movable roll, whereby said movable roll approaches and recedes from the other roll in a substantially straight line.

5. A mill for rolling disks comprising two cooperating and conically tapered rolls having their axes of rotation in a common vertical plane, inclined shafts 'supporting said for said shafts adjacent to said rolls, a rigid yoke or frame surrounding said bearings, and cam-operated means. carried by said yoke for reciprocatin one of said rolls toward and from the ot er roll. j

7 A mill for rolling disks comprising two cooperatingl rolls, shafts supporting said rolls and having converging axes, bearings for said shafts adjacent to said rolls, arigid yoke or frame surrounding said bearings, a roller carried by one of said bearings, -a cam carried by said yoke and operable through said roller to move said bearing and its roll toward the other roll, and means for with,- drawing said bearing and roll in opposition to the movement imparted by said cani.

8. A mill for rolling disks comprising two cooperating rolls, shafts supporting said rolls and having converging axes, bearin s for said shafts adjacent to said rolls, a rigid yoke or frame surrounding said bearings, said bearings fitting within/Said yoke and bcing slidably movable towardand from each other, aroller carried by one of said bearings, a cam carried by said yoke and operating through said roller to move one of said bearings toward the other, means for moving said movable bearing in opposition to the movement produced b said cam, and means for transmitting rol ing thrusts from said rolls to the ends of said yoke.

9. A mill for rolling disks comprising two cooperating rolls, a housing surrounding said rolls and composed of two separable sections, means for moving one of said rolls towardand away from the other, and means for closing and opening said housing in timed relation to the movement .of said rolls.

10. A mill for rolling tapered disks comprising two cooperating rolls, shafts supporting said rolls and having converging axes, bearings for said shafts adjacent to said rolls, a rigid yoke surrounding said bearings, cam-operated means carried by said yoke for reciprocating one of said bearings toward and from the other, a housing carried by said yoke and composed of a fixed section and a movable section mounted upon said yoke and slidable toward and from said fixed section, and means for causing said sliding section to move with said movable shaft bearing, whereby said housing is closed when the movable roll is moved toward the fixed roll, and is'opened when the movable roll is moved away from said fixed roll.

ll. A mill for rolling tapered disks comprising twoA cooperating rolls, shafts supporting said rolls having converging axes, bearings for said shafts adjacent to said rolls, a yoke surrounding said bearings, means carried by said yoke for moving one of said bearings toward and from the other, a housing surrounding said rolls and resting upon said yoke, said housing being com- Uli posed ofv a fixed section and a slidably movable section, a member carried by said mov.

of said bearings toward and away from the other, a housing surrounding said rolls and comprising two circularly curved sections, one of said sections being fixed and the o-tlier section being slidably movable to open and close said housing, a mandrel composed of a n separable section carried by each of said housing sections.

13. A mill for rolling tapered disks comprising two cooperating rolls, shafts supporting said rolls having converging axes, bearings for said shafts adjacent to said i rolls, a yoke surrounding said bearings,

means carried bysaid yoke forfmoving'. one of said bearings toward and away romthe other, a housing surrounding said ro l's and comprising two circularly curved sections, one of said sectionsbeing fixed and the'other section being slidably movable to open and close said housing, a mandrelcomposed of a separable section carried lby each ofsaid housing sections, and means for circulating cooling fluid through said mandrel. v

14. A mill for rolling tapered disks com prisiug two coderating rolls, shafts supporting said ro s having converging axes,

eax-ings for said shafts adjacent to said rolls, a yoke surrounding said bearings, means carried'by said oke for moving one of said bearings towar and away from the other, a housing surrounding said rolls andA comprising two circularly curved sections, one of said sections being fixed and the other section being slidablyv movable to open andy close said housing, a mandrel composed'ofl a separable section carried by each of said' housing sections, rods for supporting blanks in osition to be received upon said mandrel, an( means for reciprocating" said rods to A and from blank-receiving positionin timed relation to the movement of said movable roll.

15. A mill for rolling tapered disks comprising two` coo erating rolls, shafts supporting said rol s having converging axes, bearings for said shafts adjacent to said means carried by said yoke for moving one of said bearings toward and away from the other, a housing surrounding said rolls and comprising two circularly curved sections,

one of said sections being fixed and the ^rolls, a yoke surrounding said bearings,

other section being slidably movable to open and close said housing, a mandrel c olV Osed of' a separable lsection carried by each o said housing sections, and means operable when said movable housing section is withdrawn from. said fixed section for removing' finished disks from said mandrel.

prisiiig two cooperating and converging tapered'rolls having their axes of rotation in a common vertical plane, shafts support- Ving said rolls,l bearings for said shafts adously rigid yoke surrounding the upper bearings of said roll shafts, a cam roller carried by the upper bearing of said movable roll, a cani carried by said yoke and operating through said cam roller to move said movable roll toward the other roll, means for transmitting rolling thrust through said rolls to the ends of said yoke, a housing carried by said yokeand composed of a fixed section and a slidable section, a member carried by the upper bearingof said movable roll and engaging a portion of said slidable housing section, a weight connected to said slidable section and tending to move said slidable section away from said fixed section, and also tending to move said movable roll away from said fixed roll, a burner within said housing, means for confining mostof the heat from said burner to the outer portion of said-housing, means for positioning blanks within said housing, a separable mandrel carried by the sections of said housing, means for carrying cooling fluidv through said mandreh'means for exhausting air from said housing, and means for detaching finished disks from said mandrel when said housing is opened.

In testimony whereof I, the said ARTHUR MARTIN, have hereunto set my hand.

ARTHUR MART IN.

16. A mill for rolling tapered disks' cpm:

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