|Publication number||US3653162 A|
|Publication date||Apr 4, 1972|
|Filing date||Jan 25, 1971|
|Priority date||Jan 25, 1971|
|Publication number||US 3653162 A, US 3653162A, US-A-3653162, US3653162 A, US3653162A|
|Inventors||Stephen C Clark Jr|
|Original Assignee||Ingersoll Milling Machine Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (12), Classifications (13)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Clark, Jr.
[4 1 Apr. 4, 1972 I541 APPARATUS FOR TURNING WORKPIECES Stephen C. Clark, Jr., Phoenixville, Pa.
 Assignee: The Ingersoll Milling Machine Company,
221 Filed: Jan. 25, 1971 211 Appl.No.: 109,525
Related U.S. Application Data  Division of Ser. No. 790,323, Jan. 10, 1969.
 U.S.Cl. 51/165 TP,51/49 [5 l] Int. Cl ..B24b 5/04  Field ofSearch 51/49, 165 R, 165 T1, 165.71,
Primary Examiner-Lester M. Swingle An0meyWolfe, Hubbard, Leydig, Voit & Osann, Ltd.
[ 5 7 ABSTRACT Disclosed here are methods and automatic apparatus for grinding cylindrical workpieces, such as the contoured rolls used in metal rolling mills. The methods and apparatus involve l) automatic finding of the lengthwise center of rolls of different and undetermined lengths so as to establish a reference position for the execution of a numerically programmed path defined relative to the center of a roll as a point of symmetry, (2) the storage of the successive instructions of multi-axis movements making up a numerically defined profile or contoured path, and the use of those instructions repeatedly and in whole or in part as called for by different ones of a sequence of commands read from storage and executed in succession, (3) the automatic alignment of the roll axis parallel to the longitudinal axis of motion in a grinding machine by pivoting of one end of the roll about the other until the sensed difi'erence in positions of the roll surface, along an axis transverse to the longitudinal axis and at locations near opposite ends of the roll, is changed to a predetermined fraction of the originally sensed difference, (4) the initiation of grinding passes from that end of a roll which is largest in diameter, so as to avoid digging in" or increasing the depth of wheel bite as the wheel moves lengthwise of the roll, (5) the execution of continuous passes of the grinding wheel with pre-programmed values of feed rate, wheel speed, roll speed, continuous infeed and incremental infeed until a preprogrammed thickness of material has been removed from the roll surface, and (6) the grinding down of a roll until it is reduced to a diameter equal that of a previously ground roll of a matched pair. These functions are all obtained by the calling out and execution of preestablished routines in response to the reading from storage of pre-programmed sequence commands, so that in the disclosed method and apparatus there is an automatic progression from each type of operation to the next, and with the following of numerically defined profile whenever it is required.
8 Claims, 28 Drawing Figures PATENTEDAPR M972 3,653,162
SHEET CIUF 18 QA omasY/ PATENTEDAPR 4:972 3.653162 SHEET 0m 18 Stephen C. c/ark jn 7 i Mu; VJ M PATENTED 4 I972 U from FIGB (:H DRESET GATES] PRESET GATES IE, .I
3HEET 4; L169 REET GATE5 \BLL M DIRECTION 3 1 p @C: 0wm
J1 @PULSE N TO FIG (5F Bl DIRECTIONAL COUNTER READOUT GATES SIGNAL RESET GATES 975015 IN F1010 OUT AAA
J1 @PULSEK N BIDIRECUONAL.
COUNTEK READOUT GATES en J @womozx/ PATENTEDAPR 4:972 3 653,162
SHEET 10% 18 I vM AC/DC Z R CONVERTER 2 f DETECTOR Has PSL H19 PSR mwigroTof-kd APPARATUS FOR TURNING WORKPIECES l. Contouring Apparatus l 2. Sequence Command System l2 3. Data Manipulation Apparatus l3 D. Methods and Apparatus for Grinding a Roll l5 l. Setup Procedure l5 2. Location of Lengthwise Center; M6l 17 (a) Movement of the Swivel Base to the Center ofB Axis Travel 17 (b) Setting the Platform 35 to the Center of X Axis Travel 18 (c) Movement of Proximity Switches to Operative P9SitiQrts,,,. l8 (d) Movement ofWheel to Center of Roll. 19 3. Automatic Alignment ofthe Roll Axis. 23 (a) a' PQ @li9E.-;-- 23 (b) Movement to Location of First Gaging Band... 25 (c) Bringing the Wheel into Touching Contact with the Roll 26 td) Grinding Right Gage Band to Predetermined Depth L. 27 (e) Movement of Wheel to Location of Left (inge Band 28 tfi Grinding ofthe Left Gaging Band 29 (g) Rctrnction ofthe Wheel Free ofthe Roll. 29 (h) Sensing the Location ofthe Left Gaging Band on the RearSide ofthc Roll 30 4. Determining Direction of First Grinding Pass;
InitialGrinding t (a) Right End Larger 37 (b) Left End Larger 37 (c) Status of the System Prior to First Grinding Pass 38 (d) First Grinding Pass and Continuous Passing... 39 (i) Case IMaten'al Removal Incomplete 40 (ii) C ase l I Mate ialRemglflComplete 4l 5. Rough Grinding 42 1 6. Finish Grinding 43 1 7. Sensing and Signaling the Roll Diameter 44 8. Cleaning Up the Roll Surface by Sparking Passes 49 9. Polishing Passes 50 E. Grinding a Second Roll to the Same Diamqe A 52 F. An Alternative Embodiment 56 C ROSS-REFERENCE TO A RELATED APPLICATION This application is a division of my copending application Ser. No. 790,323,filed Jan. 10, 1969.
BACKGROUND OF THE INVENTION The present invention relates in general to apparatus for the turning of cylindrical workpieces, and while it will find advantageous use in the operation of lathes, the invention is adapted to be applied with special advantages in the operation of grinding machines for shaping or renewing the shape of rolls such as those employed in metal rolling mills.
In the operation of large installations for the rolling of steel or aluminum into thin sheets or strips for coiling, the high inter-roll pressures and roll speeds result in severe wear of the surfaces of the individual rolls. The wear is often non-uniform, and any roll surface irregularities result in magnified surface imperfections in the sheets or strips. It is common practice to change the rolls in a given mill stand frequently, as often as *once per eight hour shift. When each worn roll is removed from the mill, there is a need to have its surface re-finished or re-ground to nearly perfect smoothness and with the desired cylindrical shape (which may be a convex or concave contour lengthwise of the roll to compensate for roll loading pressure and produce a desired cross sectional shape in the rolled strip). To keep a large mill, and the investment which it represents, operating efficiently, it is desirable to re-grind worn rolls not only quickly so that they may be returned to service, but also with precision.
The increasingly severe shortage of skilled machinists leads to the result that manual control of grinding machines ofiers little prospect of satisfying the current demand for rapid and precise grinding of rolls. One particular difficulty encountered in the operation of a grinding machine under manual control is in accurately grinding the roll to a predetermined final diameter and contour while removing as little material as possible from the roll so as to not unduly shorten the usable life of the roll. The movements of the grinding wheel thus must be controlled precisely and, in addition, care must be taken first to determine the final size and shape to which the roll is to be ground and then to terminate the grinding operation once such size and shape have been reached.
SUMMARY OF THE INVENTION The principal object of the present invention is to provide new and advantageous apparatus for automatically machining cylindrical workpieces to desired sizes and shapes as defined and commanded in advance by programmed data which control the machining operation completely and temiinate the operation when the desired size and shape have been obtained.
A related object of the invention is to provide for the sequential execution of different routines or operations in the overall shaping of a cylindrical workpiece, and wherein one or more routines so executed results in the removal of the desired thickness of material from the workpiece surface by successive passes of a tool to remove successive incremental thicknesses-characterized by the advantages that the number of passes need not be estimated or commanded, and that the mere commanding of the removal of a desired thickness results in the automatic accomplishment of all of the individual operational steps, repeated as many times as may be necessary, to effect such removal.
A more detailed object is to provide new and improved apparatus for producing a signal representative of the diameter of a cylindrical workpiece after each pass of a tool, for comparing the signal thus produced with a signal representative of a commanded final diameter, and, when the two signals do not agree, for automatically advancing the tool a predetermined distance toward the workpiece and subsequently effecting another pass of the tool along the workpiece.
The invention also is characterized by the novel mounting and positioning of a workpiece sensor for detecting the surface of the workpiece and producing the signal representative of the diameter thereof, the sensor being movable longitudinally with and located directly opposite the tool so as to be in position to detect the end of the workpiece after each pass of the tool.
The foregoing summary of the invention and the advantageous objectives achieved thereby will be better understood after consideration of the more detailed description of a specific, exemplary embodiment of the methods and apparatus. And additional advantages will also become apparent as the detailed description proceeds with reference to the accompanying drawings.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3056240 *||Sep 1, 1960||Oct 2, 1962||Cincinnati Milling Machine Co||Automatic grinding machine|
|US3088250 *||Oct 18, 1961||May 7, 1963||Farrel Birmingham Co Inc||Automated roll grinder|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5928061 *||Oct 15, 1997||Jul 27, 1999||Toyoda Koki Kabushiki Kaisha||Wheel-head feed mechanism and grinder using the same|
|US6159074 *||Jan 7, 1999||Dec 12, 2000||Kube; Samuel C.||Caliper assembly for a grinding machine|
|US6827530||Jul 8, 2002||Dec 7, 2004||Self Leveling Machines, Inc.||Symmetrical mill|
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|US8029338 *||Mar 8, 2004||Oct 4, 2011||Diamond Innovations, Inc.||Grinding wheel for roll grinding application and method of roll grinding thereof|
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|US20120122374 *||Nov 15, 2011||May 17, 2012||Jochen Honold||Grinding device for rollers|
|CN102458758A *||Apr 20, 2010||May 16, 2012||沃依特专利有限责任公司||Grinding device for rolls having stationary guide rails and mobile grinding unit|
|EP3108997A1 *||Jun 22, 2016||Dec 28, 2016||Apko Technology, Inc.||In situ grinding apparatus for resurfacing rubber belts and rollers|
|WO2010130531A1 *||Apr 20, 2010||Nov 18, 2010||Voith Patent Gmbh||Grinding device for rolls having stationary guide rails and mobile grinding unit|
|U.S. Classification||451/4, 451/142, 451/9, 451/14|
|International Classification||B24B49/00, B24B5/04, G05B19/18|
|Cooperative Classification||B24B5/04, B24B49/00, G05B19/188|
|European Classification||B24B49/00, G05B19/18F, B24B5/04|