Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3653162 A
Publication typeGrant
Publication dateApr 4, 1972
Filing dateJan 25, 1971
Priority dateJan 25, 1971
Publication numberUS 3653162 A, US 3653162A, US-A-3653162, US3653162 A, US3653162A
InventorsStephen C Clark Jr
Original AssigneeIngersoll Milling Machine Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for turning workpieces
US 3653162 A
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 (1) 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 difference 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 pre-established 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.
Images(18)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent Clark, Jr.

[4 1 Apr. 4, 1972 I541 APPARATUS FOR TURNING WORKPIECES Stephen C. Clark, Jr., Phoenixville, Pa.

[73] Assignee: The Ingersoll Milling Machine Company,

Rockford, 111.

221 Filed: Jan. 25, 1971 211 Appl.No.: 109,525

[72] lnventor:

Related U.S. Application Data [62] Division of Ser. No. 790,323, Jan. 10, 1969.

[52] U.S.Cl. 51/165 TP,51/49 [5 l] Int. Cl ..B24b 5/04 [58] 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.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3056240 *Sep 1, 1960Oct 2, 1962Cincinnati Milling Machine CoAutomatic grinding machine
US3088250 *Oct 18, 1961May 7, 1963Farrel Birmingham Co IncAutomated roll grinder
US3333370 *Nov 17, 1964Aug 1, 1967Farrel CorpRoll grinding method
US3353302 *Nov 23, 1965Nov 21, 1967Mesta Machine CoRoll grinders
US3391497 *Nov 17, 1964Jul 9, 1968Farrel CorpRoll grinding and gaging apparatus
US3422583 *Apr 18, 1966Jan 21, 1969Cincinnati Milling Machine CoMethod for positioning a roll on a roll grinder
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5928061 *Oct 15, 1997Jul 27, 1999Toyoda Koki Kabushiki KaishaWheel-head feed mechanism and grinder using the same
US6159074 *Jan 7, 1999Dec 12, 2000Kube; Samuel C.Caliper assembly for a grinding machine
US6827530Jul 8, 2002Dec 7, 2004Self Leveling Machines, Inc.Symmetrical mill
US6832424Apr 20, 2004Dec 21, 2004Self Leveling Machines, Inc.Symmetrical mill
US8029338 *Mar 8, 2004Oct 4, 2011Diamond Innovations, Inc.Grinding wheel for roll grinding application and method of roll grinding thereof
US20030009872 *Jul 8, 2002Jan 16, 2003Self Leveling Machines, Inc.Symmetrical mill
US20040197157 *Apr 20, 2004Oct 7, 2004Self Leveling Machines, Inc.Symmetrical mill
US20070099548 *Mar 8, 2004May 3, 2007Kumar Kris VGrinding wheel for roll grinding application and method of roll grinding thereof
US20120122374 *Nov 15, 2011May 17, 2012Jochen HonoldGrinding device for rollers
CN102458758A *Apr 20, 2010May 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, 2016Dec 28, 2016Apko Technology, Inc.In situ grinding apparatus for resurfacing rubber belts and rollers
WO2010130531A1 *Apr 20, 2010Nov 18, 2010Voith Patent GmbhGrinding device for rolls having stationary guide rails and mobile grinding unit
Classifications
U.S. Classification451/4, 451/142, 451/9, 451/14
International ClassificationB24B49/00, B24B5/04, G05B19/18
Cooperative ClassificationB24B5/04, B24B49/00, G05B19/188
European ClassificationB24B49/00, G05B19/18F, B24B5/04