US 2878697 A
Description (OCR text may contain errors)
' March 24, 1959 Filed June 3, 1953 F. R. KRAUSE MACHINE FOR ROLLING METAL 14 Sheets-Sheet 1 8 :g INVENTOR.
FRANK R. KRAUSE (L5 lrw ATTORNEYS March 24, 1959 F. R. KRAUSE 2,373,697
MACHINE FOR ROLLING METAL Filed Junez, 1953 14 Sheets-Sheet 2 r INVENTOR. FRANK R. KRAUSE ATTORNEYS March 24, 1959 F. R. KRAUSE 2,373,697
MACHINE FOR ROLLING METAL Filed June 3, 1953 l4Sheets-Sheet 4 goo 1 $3 IN VEN TOR.
K RAUSE FRANK R.
AT TO RNEYS March 24; 1959 F. R. KRAUSE 2,8785697 MACHINE FOR ROLLING METAL Filed June s, 195: 14 Sheets-Sheet s T'] 345 v INVENTOR.
FRANK R. KRAUSE 34o 34a 342 344 BY ATTORNEYS F. R. KRAUSE MACHINE FOR ROLLING METAL March 24, 1959 14 Sheets-Sheet 6 Filed June 5. 1953 INVEN TOR.
FRANK R. KRAUSE ATTORNEYS.
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MACHINE FOR ROLLING METAL Filed June 3, 1953 14 Sheets-Sheet 14L.
I4 6 I INVENTOR. Iig-QE FRANK R. KRAUSE ATTORNEYS United States Patent MACHINE FOR ROLLING METAL Frank R. Krause, New Castle, Pa., assignor to Thompson Products, Inc., Cleveland, Ohio, a corporation of Ohio Application June 3, 1953, Serial No. 359,304
4 Claims. (CI. 80-26) This invention relates to a machine for rolling metal,
and more particularly to a new and improved rolling mill type of machine and method described in my prior U.S. Y
patents, Patent No. 2,161,064, issued June 6, 1939, and Patent No. 2,223,039, issued November 26, 1940, but constitutes an extensive improvment thereover permitting improved and more efficient operation of the machine, greater simplicity in its construction, and gerater economy in its construction and operation.
Many advantages are obtained from the capacity of a rolling mill of the type of the present invention to reduce a workpiece of such character as raw bar stock or like material, the full extent of the desired reduction in a single pass thereof through the mill stand.
In the conventional type of mill, such as the well known four high mill, wherein the workpiece is reduced from its small or pre-reduced end to its large end, the rolls employed are necessarily of. large diameter to obtain a slip angle of suflicient size for the desired draft. Thus, to prevent slippage between the rolls and the work when any reasonably heavy draft is taken, a large set of rolls must be used. Further, several passes through the rolling mill are necessary to efiect a given reduction in the workpiece and although general elongation is accomplished there is accompanied with it extensive spreading of the material and therefore extensive waste.
In a mill embody the principles of the present invention all of the above difliculties and problems are obviated as provision is made therein for greatly elongating a workpiece without subjecting it to severe spreading and waste, and the allowable draft is greatly increased by loading the periphery of the rolls so that the entire diameter of the roll forms one leg of the slip angle. Small rolls with large slip angles are thereby provided. Since only one pair of rolls is employed no deleterious efiects due to misaligned or improperly driven sets of rolls can occur.
By the present invention there is provided a new and improved rolling mill for reducing a workpiece to a desired thickness and contour in a single pass through the rolling mill.
There is also provided by the present invention a new and improved rolling mill with a single pair of rolls for forming turbine blades from raw bar stock or like material in a single pass thereof through the rolling mill.
Also provided by the present invention is a new and improved rolling mill with an improved mill housing having provision for means to release cam plates from the rolls on the roll carriage at any position of the mill housing and thereby incorporating a new and improved safety measure therein and quick release mechanism facilitating greater ease in change of parts.
By the present invention there is also provided a new and improved mill housing driving system permitting ICE greater operator control and synchronization of the mill movement.
By the present invention there is also provided an improved hydraulic driving system for the mill housing and thereby for the roll carriage carrying the single pair of rolls of this improved rolling mill.
The present invention also provides an improved roll carriage with a single pair of improved rolls which are coordinated with the mill housing and act upon the workpiece to reduce the workpiece to a desired thickness and contour in a single pass of the workpiece through the rolling mill.
The present invention also provides a new and improved aligning mechanism coordinating the action of the rolls on the roll carriage and the mill housing with each new increment of the workpiece fed into the rolling mill.
The present invention further provides an improved aligning mechanism which mechanically couples the mill housing and the roll carriage through a gear and rack synchronizing system which operates to dephasethe rolls from the cam plates of the mill housing and from the workpiece at the end of each working stroke and to properly phase the same at the beginning of each working stroke.
There is also provided by the present invention a new and improved index screw, one-way feed mechanism which incremently feeds the workpiece to the rolling stage on each return stroke of the mill housing in a new and improved manner.
The present invention also provides the new and improved feed table mechanism with an improved rapid traverse or return system to facilitate quick return of the feed mechanism to its initial position and thereby increase the productivity of the new and improved rolling mill of this invention.
The present invention also provides a new and improved tension table mechanism hydraulically actuated andcoordinated with the feed table mechanism to hold the workpiece and retain it under a constant tension force.
Thus it will be seen that by the present invention there is provided a vastly new and improved rolling mill for rolling turbine blades in a single pass of raw bar stock .or like material through the rolling mill, the rolling mill being provided with an improved mill housing, and an improved roll carriage coordinated with the improved mill housing by new and improved aligning and coordinating means whereby the mill housing and roll carriage are coordinated with an improved feed table mechanism cooperating with an improved tension table mechanism.
By the present invention there is further provided new and improved means for driving the rolls of the roll carriage whereby a greater than heretofore possible draft may be taken in the workpiece.
The present invention also provides new and improved rollers for the rolling mill whereby turbine blades may be formed with an integral root thereon.
The present invention also provides new and improved work gripping and tensioning mechanisms for gripping a Work piece with a preformed root sectionthis work piece to be rolled in a single operation into a turbine blade and for gripping a work piece to be rolled in a single pass into a turbine blade with an integral root base section.
Other and further features of the present invention and modifications within the scope thereof will be apparent to those skilled in the art from the following description and from the annexed sheets of drawings, illustrating, 'by way of example, preferred embodiments of the present invention with numerals of references marked thereon, which form a part of this specification, like reference numerals referring to like parts in the several figures of the drawings which:
Figure 1 illustrates one embodiment of the present invention in broken front-side elevation and partially in section;
Figure 2 is a broken plan view, partially in section, of the embodiment illustrated in Figure 1;
Figure 3 is a front-side elevational view of the central portion of the rolling mill illustrated in Figures 1 and 2 but on a larger scale and also shown partially in vertical cross section;
Figure 4 is a top plan view of the portion of the rolling mill illustrated in Figure 3, and also shown partially in horizontal cross-section with parts omitted for clarity;
Figure 5 is a partial section front end view taken along the line of VV of Figure 4, with selected parts in end elevation and having parts omitted for clarity;
Figure 6 illustrates one form of a pair of rolls that may be used in the rolling mill of the present invention;
Figure 7 is a back-side elevational semi-schematic view with parts in vertical cross-section of the center portion of the rolling mill of the present invention showing the aligning and coordinating mechanism and the mill housing and roller carriage in the two extreme positions thereof on the main frame;
Figure 8 is a broken top plan view of the aligning and coordinating mechanism illustrated in Figure 7 and is partially in section with parts omitted for clarity;
Figure 9 is a broken top plan view of the feed table mechanism at the rear portion of the rolling mill illustrated in Figures 1 and 2 with parts omitted for clarity;
Figure 10 is a front side vertical cross-section view taken along the line XX of Figure 9 with parts omitted for clarity;
Figure 11 is a back-end view of the arrangement of the feed table mechanism, partially in vertical cross-section taken along the line XI-XI of Figure 10;
Figure 12 is a front end view of the mechanism of the feed table arrangement, partially in vertical cross-section and taken along the line XII-XII of Figure 10 with parts omitted;
Figure 13 is a front side vertical cross-section of the mill housing and a modified form of roll carriage and work feed gripper clamp;
Figure 14 is a horizontal sectional view taken along the line XIVXIV of Figure 13 and illustrating the lower wedge block adjusting screw and indicator dial mechanism;
Figure 15 is an end elevational view of the adjusting screw and indicator dial mechanism taken along the line XVXV of Figure 14;
Figure 16 is an enlarged front-side elevational view partially in vertical cross section and illustrating a modified form of the roll carriage, roll carriage drive, mill housing and cam plates, and workpiece gripper and feed mechanism with parts omitted for clarity;
Figure 17 is a top plan view partially in horizontal section illustrating the same modification as that shown in Figure 16;
Figure 18 is a partial side elevational view illustrating a modified form of rollers for rolling a turbine blade with an integral root thereon;
Figure 19 illustrates the same modification as that illustrated in Figure 18 but is partially in section and shows the rolls and workpiece in a relatively different position;
Figure 20 is a partial vertical sectional view of the rolls and the workpiece of Figures 18 and 19 taken along the line XX-XX of Figure 19;
Figure 21 is a schematic illustration of the cam plates and rolls as they operate upon a work piece;
Figures 22 and 23 illustrate new workpiece end form and the effect of working the same by a rolling mill embodying the principles of the present invention; and
Figures 24, 25 and 26 illustrate various forms of ma- 4 terial that a rolling mill embodying the principles of the present invention is readily adapted to operate upon.
A rolling mill, indicated generally at 1, Figures 1 and 2, in accordance with the principles of the present invention, has a mill housing 2, a roll carriage 3, a feed table 4 including a rapid traversing system 5, a tension table 6, and an aligning mechanism 7, all cooperatively mounted on a main frame 8 with a coolant tank 9 positioned beneath the working region of the rolling mill.
In detail, the main frame 8 is so constructed that a pair of longitudinal I-beams 801, 802 are supported in parallel by transverse I-beam support members or pedestals 803, 804. The two main I-beams 801, 802 are so supported that they present coplanar flat narrow sides at the top of the frame 8. Secured to the narrow flat sides at the top of the frame, one on each I-beam member, are a pair of channeled track members 805, 806 which are symmetrical, parallel and directly opposite each other on the top of the main frame 8 (channeled track member 806 has a cross-section which may best be viewed in Figure 5). Secured to the top of each of the channeled track members 805, 806, one on each track member, are a pair of track gib bars 807, 808 which together with the channeled track members form guide tracks slidably engaging and supporting the mill housing 2 by appropriate means, hereinafter described, secured to the mill housing 2.
As a preferred driving system for the mill housing 2, and as one of the improved features of the present invention, a pair of synchronized, double acting hydraulic cylinders 809, 810 are secured to the top of the main frame. The foot or rear end of the hydraulic cylinders 809, 810 are secured to cylinder supporting blocks 811, 812 and the head or front ends of the cylinders are supported on and secured to the track gib bars 807, 808, respectively, in such a manner that the cylinders 809, 810 are parallel to each other, to the track members, and to the center line of the main frame. The pistons 813, 814 of hydraulic cylinders 809, 810, respectively, extend from the front or head end of the cylinders and are secured to clevis members 815, 816 which are in turn secured to ear members 205, 206 on the mill housing 2 by clevis pins 817, 818.
Through this arrangement of the cylinders 809, 810, the pistons, 813, 814, the clevis members 815, 816, the clevis pins 817, 818 and the ears 205, 206 when the synchronized double acting hydraulic cylinders 809, 810 are actuated, the mill housing 2 may be stroked or reciprocated selectively forward and rearward as it slides in the track provided by the channel track members 805, 806 and the track gib bars 807, 808 along the main frame 8.
The mill housing 2, as best seen in Figures 3, 4 and 5, which illustrate a preferred embodiment of this feature of the present invention, constitutes an important improvcment in rolling mills of the type herein described.
This mill housing 2 is framed from top and bottom housing blocks 201, 202 which are secured to a pair of side tie plates 203,204. The tie plates 203, 204 carry and have secured thereto ear members 205, 206 which engage the clevis pins 817, 818 for driving the mill housing. Track bars 207, 208 fixed on the external lateral surface of each of the tie plates engage the channeled track members 805, 806 and the track gib bars 807, 808 for slidably supporting the mill housing 2. Each of the track bars 207, 208 have secured thereto bearing plates 209, 210, 211 along the elongated surfaces thereof to provide sliding bearings in the track members for the reciprocal mill housing, and are formed preferably of bearing bronze. (See Figure 5.)
The top housing block 201, and correspondingly the bottom housing block 202, has an inclined surface 212 channeled therein. Similarly the bottom housing block 202 has an inclined surface 213 channeled therein. Forwardly broadening tapered wedge block 214, 215 engages each of the inclined channels 212, 213 in the top and bottom housing blocks respectively and are so formed and cooperate therewith as to present substantially parallel inner surfaces 216, 217 to the inside of the mill housing 2. Liners 218, 219, serving as bearings for the wedge blocks 214, 215, engage the inner parallel surfaces 216, 217 of the wedge blocks and are held thereagainst in tight engagement. Against these liners, 218, 219 lie a pair of filler blocks 220, 221, respectively, which have recesses in the side surfaces thereof to provide space for resilient clamping means to clamp the top housing block 201, the top wedge block 214, the top liner 218, and the top filler block 220, together, and to clamp the-bottom housing block 202, the bottom wedge 215, the bottom liner 219 and the bottom filler block 221 together.
The clamping means employed to secure together the above described assemblies in a resilient manner are constituted by sets of clamping bolts 222, 223, 224, 225, extending through holes in the top housing block 201, and sets of clamping bolts 226, 227 extending through holes in the bottom housing block 202. Outside the mill housing these bolts carry compression springs and adjusting nuts whereby the clamp screws are biased outwardly from 'the mill housing 2. Inside the mill housing the clamping screws carry clamping fingers which are preferably pinned onto the clamping bolt respectively for flexibility of joint and restraint against rotation of the bolts.
The filler block 220 is so grooved that the clamping bolts or screws 223, 224, by the fingerssecured thereon, resiliently clamp together the top housing block 201, the top wedge block 214 and the top liner 218 on opposite sides thereof, and the clamping screws 222 and 225 resiliently clamp together the top housing block 201, the top wedge block 214, the top liner 218 and the top filler block 220 on the same sides thereof as theclamping screws 223 and 224.
Further recesses are provided in the top and bottom filler blocks 2 20, 221 whereby a matched pair of roll engaging cam plates are secured to the inner surfaces of the filler block by such means as, for example, bolts. These cam plates 228, 229 each have a flat side engaging the inner side of the filler block to which it is secured and each has a pro-shaped camming surfacewhich engages the rolls on the roll carriage and which corresponds vto the camming surface of the other plate whereby substantial symmetry between the two plates is presentedto the rolls on the roll carriage and thereby to the workpiece to be rolled.
Inside the mill housing 2 and secured to the side tie plates 203, 204 are a pair of roll carriage track bars 230, 231 (note particularly Figure 5). These roll carriage track bars are secured to the tie plates 203, 204, respectively approximately midway through the heights of the tie plates, such that they arehorizontal, parallel, and facing into approximately the middle of the mill housing 2 presenting parallel upper and lower surfaces to serve as tracks and supports for the roll carriage 3 and the single pair of working rolls thereon. As will best be seen from Figures 1, 2, 3, and 4, the roll carriage track bars 230, 231 may have a length greater than the width of the tie plates 203, 204 and may extend beyond the tie plates both forwardly and rearwardly thereof to provide positive supports for the roll carriage 3 at each end of each stroke of the rolling mill.
To provide an adjusting mechanism and a ready release mechanism whereby the cam plates 228, 229 may be adjusted in elevation or readily released from the rolls of the roll carriage (best illustrated in Figure 3), a mounting bracket 232 and a bracket plate 233 are secured to the central forward section of the underside of the bottom housing block 202 by any convenient means such as, for example, bolts or machine screws. 1 Approximately at the forward or leading edge of the bottom housing block 202, the mounting bracket 232, which extends forwardly from the mill housing 2,;is bent downwardly so that its upper surface lies in a plane substantially parallel to the plane of the inclined surface213 of the channel in the lower housing block 202, note Figures 1 and 3. To this mounting bracket 232, andon the forward portion of the inclined upper surface thereof, there is secured a hydraulic cylinder 234 of double action character which has a piston 235 that extends rearwardly and is coupled to an adjusting screw 236 by any convenient means such as a coupling member 237.
An adjustment nut 238 threadedly engages the adjusting screw 236 and is flanged as at 239 to engage the lower rear surface of the wedge adjusting plate 240 which is secured to the bottom wedge block 215. A nut 241 on the adjusting nut 238 securely clamps the wedge adjusting plate 240 to the adjusting nut 238 between the rear surface of the nut 241 and the front surface of the flange 239, thereby securing the wedge block 215 to the piston 235 to provide for movement of the lower wedge block 215 through actuation of the double acting hydraulic cylinder 234.
This last described wedge adjusting and release mechanism carried on the mounting bracket 232 extends for wardly from the mill housing 2 and is mounted to the bottom thereof approximately midway across the width of the mill housing so that it will not interfere with any of the structure of the main frame 8 or the tension table 6 as it reciprocates forwardly and rearwardly with the mill housing 2 which is reciprocated by the action of the sychronized double acting hydraulic cylinders 809, 810.
Although the upper wedge block 214 does not have a quick release and insertion mechanism secured thereto, it too is readily adjustable by adjusting means secured thereto. An adjusting screw 242 is secured to and extends forwardly from the top housing block 201, approximately centrally of the forward face thereof, substantially parallel to the inclined surface 212 of the channel in the top housing block 201.
A top wedge block adjusting plate 243 is secured to the forward face of the wedge block 214 and has a threaded hole therein through which the top adjusting screw 242 extends. After the desired position of the top wedge is obtained by selected turning of the adjusting screw, further undesired displacement is avoided by jamming a locking nut 244 threaded onto the screw 242 against the adjusting plate 243,.
Although not critical to this particular embodiment of this feature of the present invention, the adjusting systems here may be provided with index dials and indicators for precise adjustment, setting and resetting such as those hereinafter described and illustrated in Figures 13, 14 and 15 in connection with a further embodiment of the instant invention.
The roll carriage 3 which is slidably arranged on the roll carriage track bars 230, 231 of the mill housing 2, best viewed in Figures 3, 4 and 5, has a pair of carriage side plates 301, 302 spaced apart by and secured to a carriage end plate 303 which has a central opening 304 therein for the passage of a workpiece therethrough. These carriage side plates 301, 302 are spaced apart a distance slightly less than the space between the tie plates 203, 204 of the mill housing 2 and are channeled as at 305, 306 to receive the carriage track bars 230, 231 and slidably engage the same. However, L-shaped bearing plates 307, 308 may be secured to the carriage side plate 301 to extend into the channel 305 therein to serve as bearings therefor on the roll carriage track bar 230. Similarly, L-shaped bearing plates 309, 310 may be secured to the side plate 302, to extend into the channel 306 therein to serve as bearings therefor slidably engaging the track bar 231.
An upper shaft 311 extends between and is journaled at its ends into the upper rear portion of the side plates 301, 302; and a lower shaft 312 is journaled into and extends between the lower rear of the side plate 301 and 302. Pinned onto the upper shaft 311 are a pair of upper forwardly extending links 313, 314 one being adjacent to eachlcarriage side plate 301, 302 respectively; and a pair of lower links 315, 316 are pinned onto and extend forwardly from the lower shaft 312, one being adjacent to each of the side plates 301, 302 respectively; and a pair of lower links 315, 316 are pinned onto and extend forwardly from the lower shaft 312, one being adjacent to each of the side plates 301, 302 and substantially coplanar with upper links 313, 314 respectively.
The upper links 313, 314 carry an upper roll shaft 317 near their forward ends and this upper roll shaft 317 has journaled thereon an upper roll 318 which extends horizontally across the roll carriage 3 and is adapted for working, rolling engagement with a work piece and the upper cam plate 228. Similarly, the lower links 315, 316 carry a lower roll shaft 319 on which there is journaled a lower working roll 320 which rollingly engages the lower cam plate 229 horizontally and parallel to the upper roll 318.
The upper link 313 adjacent the carriage side plate 301 is spring-biased from the lower link 315, coplanar therewith and adjacent to the side plate 301, by a compression spring 321 which is held in place by a spring pin 322 engaging the forward ends of these two links; identical spring biasing means including a spring 323 and a pin 324 biases the upper links 314 from the lower links 316 adjacent the carriage side plate 302.
By being biased apart, by such means as the spring biasing means immediately hereinabove described, the rolls 318, 320, are constantly urged against and into rolling relation with the camming surfaces of the cam plates 228, 229.
The rolls themselves may take any particular desired form such as the flat rolls shown in Figure 5 which may be used to roll such material as sheet material or bar stock or they may take the form shown in Figure 6 wherein it is shown that they are contoured to impart to the workpiece a proper shape for a turbine blade or they may take the shape shown in Figures 18, 19 and 20 wherein it is illustrated that the rolls may be shaped to form the workpiece of raw bar material into the proper contour for a turbine blade wherein it is shown that the rolls may be properly circumferentially formed to roll a root or base integral with the turbine blade, or they may take the form shown in Figure 13 whereby they are properly contoured to roll a turbine blade with a root or base portion preformed thereon and integral therewith or they may take a form appropriate to roll a plurality of blades in a single operation either as individual blades or in double form as shown in Figure 25. When the rolls are formed as in the several latter mentioned examples, the camming plates 228 and 229 would be channeled to accommodate at least the flanged portions of the rolls, note Figure 16. This will be more fully explained and described in the further description of various other embodiments of the present invention.
As a further feature of the present invention, a new and improved indexing feeding table mechanism 4 is operably afiixed to and synchronized with the mill housing 2 of the rolling mill 1. The feed table mechanism 4, illustrated generally in Figures 1 and 2 may be best understood with reference to Figures 9 through 12. The feed table mechanism 4 is secured to the main frame 8 on the rear portion of the same and top thereof. A pair of frame plates 819, 820, best seen in Figure 4, are secured to the top surfaces of the I-beams 801, 802 at the front end of the feed table 4 immediately behind the rearmost position of the mill housing 2, and support the front end of the feed table mechanism. The rear end of the feed table mechanism is supported on a cross plate 821 which is secured to the top of the I-beams 801, 802 at the rearmost end thereof, Figures 1 and 2.
A feed table bed 401, which extends substantially the full length of the feed table mechanism, from the rapid traverse system 5, Figures 1 and 2, to approximately the rearmost position of the mill housing 2, is mounted on and secured to the frame plates 819, 820 and the.
cross-plate 821 such that the feed table bed 401 is positioned approximately centrally across the width of the main frame 8 and is aligned with the mill housing 2, the roll carriage 3 and the tension table 6 and is in operating position with respect thereto. A pair of symmetrical feedtable bed track bars 402, 403 each having a channel 404, 405 therein, and a feed table track gib bar 406, 407 secured to the top of each thereof, respectively, form .a part of the feed table bed 401 and are mounted and secured in opposite facing relation to each other on the support members 408 forming a substantial portion of the feedtable bed 401.
Each combination of a feed table bed track bar and a gib bar forms a channel track which serves as a track to support and slidably guide a gripper carriage 409 having oppositely disposed flanges 410, 411 thereon which in turn carry channel bearing members 412, 413, respectively, for slidingly engaging the tracks so formed by the feed .table bed track bars and gib bars.
An elongated feed screw 414, threaded throughout the major portion of its length, is journaled in bearings 415, 416 secured to each end of the feed table bed respectively; these hearings 415, 416 so support the feed screw 414 that it is rotatable about its longitudinal axis only. A longitudinal bore 417 in the lower portion of the gripper carriage 409 allows the feed screw 414 to pass therethrough; but a transverse bore 418 intersecting the longitudinal bore 417 carries a gripper feed nut 419 which threadably engages the threads of the feed screw 414 and thereby so interconnects the gripper carriage 409 and the feed screw 414 that rotation of the feed screw longitudinally drives the gripper carriage forwardly or rearwardly dependent upon the direction of rotation of the feed screw.
To properly grip the workpiece so that it will move forwardly when the gripper carriage is moved forwardly through the action of rotation of the feed screw 414, the gripper carriage 409 is longitudinally channeled, as at 426 and carries a lower gripper jaw 427 pinned to the lower face of the channel 426. An upper gripper jaw 428 is carried by a gripper jaw screw 429 which is threaded into a vertical bore 430 in the upper portion of the gripper carriage 409; the gripper jaw screw 429 has a tool receiving outer end for selectively tightening or loosening the jaws 427, 428.
At its forward end the feed screw 414 has an unthreaded .and reduced portion, the rearmost end of which portion is supported and journaled in the bearing 415 and forwardly thereof successively supports a spur gear 420 which is journaled thereon and which is selectively, manually engageable or disengageable with one side of an over-running clutch 421. The other side of the one way, overrunning clutch 421 is fixed to the front end of the unthreaded portion of the feed screw 414. These items .are so arranged that when the spur gear 420 is connected to the said one side of the overrunning clutch 421 by the action of the clutch handle 422, which is pivotally supported at its center by an appropriate pivot 423 and has its outer end urged forwardly by spring 424 that is hooked into a bracket 425, rotation of the spur gear in one direction will, through the coupling of the overrunning clutch 421, drive the feed screw in that one direction and thereby move the gripper carriage forwardly. Rotation of the spur gear 420 in the opposite direction will be lost in the overrunning clutch 421 and therefore will not move the feed screw 414.
To synchronize the operation of the feed table mechanism with the reciprocation of the mill housing and the roll carriage, a tongue 431 having a securing plate 432 affixed to the front end thereof is secured centrally across the rear surface of the lower housing block 202, Figure 3. Supported on and secured to a transverse main frame member a tongue guide plate 433 slidably engages and guides the tongue 431 longitudinally and serves as a bearing therefor. The tongue 431 has a length slightly greater than the length of the strokeof the mill housing 2 plus the distances between the rearmost positions of the mill housing 2 and the said transverse main frame member so that at the forward end of the stroke of the mill housing, the rear end of the tongue will remain supported and guided by the tongue guide 433. A channelshaped cam track roller guide 434 is pivotally secured to the tongue by a pivot pin 435 and a bearing plate 436 which latter member lies between the roller guide 434 and the tongue 431 and about the pivot pin 435. End plates 437, 438 are secured to the underside of the channeled cam track roller guide 434 at the ends thereof extending from the opposite ends thereof and from opposite sides thereof, respectively. These end plates 437, 438 have arcuate slots 439, 440, therein which have a radius equal to their distance from the pivot pin 435 so that clamping bolts 441, 442 extending through the slots and screwed into appropriately threaded holes in the tongue 431 may serve to clamp the cam track roller guide to the tongue in any desired pivoted position of the roller guide with respect to the tongue which position is limited only by the length of the slots 439, 440, respectively, in the end plates 437, 438. As will hereinafter be described, the angle of the cam track roller guide with respect to the tongue determines the amount of feed for the workpiece on each stroke of the mill housing; the greater the angle therebetween the greater the amount of feed per stroke.
A cam track roller 443 is mounted on and journaled into a slide .bar 444 which is laterally reciprocated through the bearings of the rack guide blocks 445, 446 by the action of the cam track roller guide 434 on the roller 443. The slide bar 444 is restrained against a vertical movement by gib blocks 447 secured to the top of the rack guide blocks 445, 446. Secured on the top surface of the slide bar 444 to laterally reciprocate therewith is a feed table rack 448 which engages the spur gear 420 and rotates the same when the rack reciprocates with the slide bar 444 through the action of the tongue 431 and the cam track roller guide 434 on the roller 443.
At the opposite end of the main frame 8 from the feed table mechanism 4, at the forward end of the main frame 8, a tension table mechanism 6 is constructed and arranged to cooperate with the feed mechanism 4 to grip the forward end of the workpiece to hold the same under a constant tension while it is being worked by the rolls of the roll carriage 3 as the roll carriage 3 is longitudinally reciprocated and actuated by the reciprocation of the mill housing 2. The construction, arrangement and positioning of the tension table mechanism 6 may be most certainly observed .by examination of Figures l and 2.
A tension table frame 601 comprised of a stand of I-beams 602, 603 is secured to and supports a tension table bed 604 which is also secured to and supported by the transverse I-beam 803 of the main frame 8 in such a manner that the longitudinal center line of the tension table 604 lies parallel to and in the same vertical plane as the longitudinal centerline of the feed table mechanism 4. The tension table bed 604 has a pair of elongated beam members 605, 606 which are secured to the I-beams 602, 603 through tension table bed support blocks 607, 608 and carry on their upper surfaces tension gripper track bars 609,- 610. The tension gripper track bars 609, 610 are channeled along the inwardly facing sides thereof to provide tracks for slidably and guideably engaging the flanges 612, 613 of the tension gripper head 611. The tension gripper head 611 is recessed at its "rearward end to receive the forward end of the workpiece which is clamped therein between the gripepr clamping screw614 and a lower gripper clamping jaw 615, the gripper clamping'screw 614- being received in the gripper head 611 by a vertical threaded bore communicating with the recess.
A hydraulic cylinder 616 preterably'of the double acting type, is secured at its ends 617, 618 to the top of the tension table supporting block 607, 608 midway between the elongated beam members 605, 606 of the tension table bed 604. A piston 619 which extends from the rearward end 618 of the hydraulic cylinder 616 is, at its rearward end, secured to the tension gripper head 611 so that actuation of the hydraulic cylinder 616 will operate on the piston 619 to move the gripper head 611 selectively forwardly or rearwardly along the tension gripper track bars 609, 610. In actual operation, however, as will be hereinafter discussed, the hydraulic cylinder 616 operates upon the piston 619 and the gripper head 611 primarily in a forward direction to maintain a constant tension force on the workpiece, the forward end of which is held in the tension gripper head 611 and the rearward end of which is held in the feed gripper carriage 409.
To synchronize and coordinate the operation of th mechanism of the rolling mill 1 and to insure proper alignment of the roll carriage 3 and the mill housing 2 with respect to each other and with respect to each new increment of the workpiece fed through the mill hous ing 2 and roll carriage 3 on each return stroke of the mill housing 2 by the feed table mechanism 4, an aligning mechanism 7 is provided at the back side of the rolling mill 1 and the main frame 8 thereof, which may best be understood by reference to Figures 7 and 8 and incidentally Figures 2, 3, 4 and 5.
A synchronizer shaft 701 is journaled for rotation about its longitudinal axis in bearings 702, 703 mounted under and secured to the forward portion of the frame plates 819, 820, and carries spur gears 704, 705 keyed thereon for rotation therewith. These two spur gears 704, 705 are a matched identical pair of the same diameter and same pitch and engage a pair of racks 707, 708, the forward ends of which are secured to the rear side of the lower end portion of the carriage end plate 303 of the roll carriage 3, and the rearward ends of which are supported and guided by the rack guide 710 that is secured to and supported on the frame plates 819, 820 and includes rack guide bars 711 and rack guide blocks 712, 713, which are so channeled as to slidably guide and support the racks.
Also keyed to the synchronizer shaft 701 for rotation therewith is the third spur gear 706 which may be constructed in any convenient manner, i.e., either as a solid one piece spur gear or as a spur gear with a separate hub section and tooth rim which are superimposed and pinned together for rotation together; this latter form of construction is illustrated in Figure 8. The third spur gear 706 is of substantially larger diameter (2 1) than the matched identical pair 704, 705 for purposes which will be hereinafter explained, and engages a synchronizer rack 709, the rear end of which is supported and guided by the rack guide bar 711 and the rack guide block 714 in the same manner that the racks 707, 708 are supported and guided by the rack guide bar 711 and the rack guide blocks 712, 713 of the rack guide 710. The front end of the synchronizer rack 709 has an unmilled portion 715 which is slidably arranged in and supported by a spring rod bracket 716 which is secured to the side tie plate 204 of the mill housing 2. A spring rod support 717 forms a part of the synchronizing rack 709 on the top of that rack at the rear end of the unmilled portion 715 thereof and has a longitudinal bore therein which receives therethrough a spring rod 718, the front end of which is secured to the spring rod bracket 716 so that the axis of the spring rod 718 is parallel to the synchronizing rack 709. A compression type coil spring 719 is supported on the spring rod 718 so that its forward end abuts the rear surface of the spring rod support 717 on the synchronizer rack 709; the rear end of the spring 719 is adjustably abutted by 11 a spring adjusting nut 720 threaded onto the spring rod 718 from the rear end thereof.
The lower front edge of the synchronizer rack 709 is recessed, as at 721, to receive a trigger catching insert 722 secured therein and extending forwardly thereof to provide a forward end which is adapted to catch and hold a trigger 723.
The trigger 723, preferably having the general configuration af a bell crank, is pivotally secured to the side tie plate 204 by a pivot bolt or pin 724 immediately forwardly from the lower leading edge of the spring rod bracket 716. The upper forward end of the trigger 723 is substantially hook-shaped to engage and hook onto the trigger catching insert 722 in the recess 721 of the synchronizing rack 709 through the combined operation of a trigger spring 725, one end of which is secured to the lower end of the trigger 723 and the other end of which is secured to a spring bracket 726, thereby urging the hooked end of the trigger 723 upwardly and rearwardly, and the compression type spring 719 which urges the rack 709 and thereby the trigger catching insert 722 forwardly into engagement with the hooked end of the trigger 723. When trigger catching insert 722 is in forwardly engagement with hooked end of trigger 723, starting synchronization is in effect with proper phasing between mill housing 2, roll carriage 3 and the work piece.
A shift arm pivot bracket 727 is also secured to the tie plate 204 at the rear edge of said tie plate and pivot ally supports a shift arm 728 on a shift arm pivot pin 729. The pin 729 may be journaled in bearing members 730 which engage the forked rearward end of the shift arm pivot bracket 727.
At its upper end the shift arm 728 has a slot 731 which slidably and rotatably engages a shift pin 732 that is secured to the unmilled portion 715 of the synchronizing rack 709. At its lower end the shift arm 728 has a bore which fixedly receives a bumper 733 which extends from both the forward and rearward faces of the shift arm 728. A pair of bumper blocks 734, 735 each receiving a plunger 736, 737 and a plunger spring 738, 739 to resiliently urge the plungers 736, 737 outwardly from the bumper block 734, 735, are secured to bumper block stands 740, 741 respectively, which are secured to and supported on the lower portion of the I-beam 802 of the main frame 8. These bumper block assemblies are so positioned that one will engage the shift arm bumper 733 immediately prior to each end of the stroke of the mill housing 2 and the roll carriage 3 whereby at the end of the forward, working stroke of the mill housing 2 the shift arm bumper 733 will engage the resiliently mounted plunger 736 and at the end of the return stroke of the mill housing 2, the bumper 733 will be engaged by the resiliently mounted plunger 737 of the bumper block 735.
A trigger release plate 742 (Figure 5 and the invisible line showing in Figure 7 illustrating the mill housing 2, the roll carriage 3, and the aligning mechanism 7 in the forwardmost position thereof) is keyed into the lower inwardly extending face of the channeled track member 806 and serves to release the trigger 723 from the trigger catching insert 721 near the forward end of the forward, working stroke of the mill housing 2 immediately prior to engagement of the bumper 733 with the plunger 736 or at the same time thereas.
The operation of the embodiment shown in Figures 1 through 5 and 7 through 12, as described above The principles of operation of the rolling mill 1 of the present invention are only generally somewhat similar to the principles of operation disclosed in my prior patents, Patent No. 2,161,064, issued on June 6, 1939, and Patent No. 2,223,039, issued on November 26, 1940 as the mechanism and mode of operation of the new and improved rolling mill of the present invention is an improvement over my prior rolling mills.
With the gripper carriage 409 moved to the rearmost position thereof through the operation of the rapid traverse mechanism 5 which consists of a rapid traverse motor 501 mounted on a traverse motor support 502 and coupled to the feed screw 414 through any convenient coupling means 503 operating through rotation of the motor 501 to rotate the feed screw 414 in such a direction as to move the gripper carriage 409 to its rearmost possible position or any other preselected position; with the piston 619 of the double acting hydraulic cylinder 616 extended so that the tension gripper 611 is similarly in its rearmost position or any other preselected position; and with the wedge blocks 214, 215 properly inserted and adjusted in the mill housing 2 to provide a proper spacing between the cam track plates or cam blocks 228, 229 to impart a proper finished thickness to the work piece, the rolling mill 1 is ready to be put into operation.
The rear end of a workpiece such as raw bar stock is inserted into the gripper carriage 409 between the gripper jaws 427 and 428 and the gripper jaw screw is tightened down so that the jaws securely hold the rear end of the workpiece. The workpiece may extend to approximately the front face of the rolling mill 1 which has been brought to its rearmost position through actuation of the double acting hydraulic cylinders 809, 810.
Upon this return of the mill housing 2 to its rearmost position, the bumper 733 engages the plunger 737 of the bumper block assembly mounted on the bumper block stand 741. Slight continued movement of the mill housing 2 in a rearward direction causes the top end of the shift arm to move in a rearward direction at a rate of approximately 2 to l greater than the rearward movement of the mill housing 2. This greater rate of movement of the shift arm 728 is transmitted to the synchronizing rack 709 through the pin 732 and thence through the racks 707, 708 and the synchronizing shaft 701, thereby moving the roll carriage rearwardly with respect to the mill housing 2 whereupon the trigger which had previously been riding beneath the trigger catching insert 722 is allowed to be urged upwardly by the trigger spring 725 to thereby engage the trigger catching insert 722 in the hooked upper end of the trigger 723 and positively properly align the roll carriage with the mill housing and the work piece for synchronized operation. At this time proper starting alignment will be had between mill housing roll carriage, and work piece.
Now, beginning the operation of the rolling mill 1, the mill housing 2 is forwardly stroked by proper actuation of the synchronized double acting hydraulic cylinders 809, 810 and as the mill housing 2 moves forwardly, the roll carriage 3 is also moved forwardly at one half displacement rate, the rolls 318, 320 being in working engagernent with the cam surfaces of the cam blocks 228, 229 since these rolls are spring biased by compression springs 321, 323.
At the start of the stroke the rolls 318, 320 are in working engagement with the most forward surfaces of cam blocks 228, 229. These surfaces have such contour that the resultant opening between the rolls is sufficiently great to clear the workpiece (thus allowing freedom for feeding workpiece thru the rolls). Shortly after the forward stroke is started, the rolls are brought into working engagement with the workpiece by reduction of the roll spacing as caused by the changing cam block contours. By this interelement working engagement and by a proper selection of the contour of the cam surfaces of the cam blocks 228, 229, the workpiece is reduced in cross section to a proper thickness and to a proper contour by the rolls as they move forwardly over the work; the rolls selectively working the workpiece during the stroke. Note Figure 21 illustrating in elevation the cam blocks, rolls and workpiece at the beginning of the