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Publication numberUS3664066 A
Publication typeGrant
Publication date23 May 1972
Filing date25 Jan 1971
Priority date25 Jan 1971
Publication numberUS 3664066 A, US 3664066A, US-A-3664066, US3664066 A, US3664066A
InventorsStephen C Clark Jr
Original AssigneeIngersoll Milling Machine Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for aligning workpieces
US 3664066 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 pre-programmed 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.
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limited States Patent Clarlgjr.

[54] METHOD AND APPARATUS FOR ALIGNING WORKPIECES Stephen C. Clark, Jr., Phoenixville, Pa.

The Ingersoll Milling Machine Company, Rockford, Ill.

[22] Filed: Jan. 25, 1971 [21] Appl. No.: 109,524

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

[ 72] Inventor:

[73] Assignee:

s2 u.s.c|. ..5l/l65'I'P,51/49,51/289R 51 Int. Cl ..B24b 5/04 58 FieldofSearch ..5l/49,165R,165TP,165.71,

5l/l65.74, 165.75, 165.76, 165.77, 289 R, 326, 327; 82/14 B, 14 D, 21 B Primary Examiner--Lester M. Swingle Att0rney-Wolfe, Hubbard, Leydig, Voit & Osann [5 7] ABSTRACT Disclosed here are methods and automatic apparatus for [451 May 23, 1972 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 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 pre-programmed 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.

10 Claims, 27 Drawing Figures Patented May 23, 1972 6 3,664,066

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METHOD AND APPARATUS FOR ALIGNING WORKPIECES TAB LE OF CONTENTS Column Abstract ofthe Disclosure Fl. Cross-Reference to a Related Application Background ofthe Invention...

Summary ofthe Invention 2 Brief Description ofthe Drawings 3 Description of Preferred Embodiments 3 A. An Exemplary Machine Tool 3 B. Control Instrumentalities on the Grinding Machine 6 1. Feedback Pulse Generators 6 2. SteadyrestServomotor 6 3. Sensing Switches 7 4. Probe Assemblies 7 5. Proximity Switches 9 C. The ControlSystem in General 9 l. Contouring Apparatus l 2. Sequence Command System l2 3. Data Manipulation Apparatus 13 D. Methods and Apparatus for GrindingaRoll 15 1. Setup Procedure 15 2. Location of Lengthwise Center; M61 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 Positions 18 (d) Movement ofWheel to CenterofRoll l9 3. Automatic Alignment ofthe Roll Axis 23 (a) Startup Operations 24 (b) Movement to Location of First Gaging Band 25 (c) Bringing the Wheel into Touching Contact with the Roll 26 (d) Grinding Right Gage Band to Predetermined Depth 27 (e) Movement of Wheel to Location of Left Gage Band 28 (f) Grinding of the Left Gaging Band 29 (8) R e traction of the Wheel Free of the Roll... 2 (h) Sensing the Location of the Left Gaging Band on the Rear Side of the Roll.. 30 4. Determining Direction of First Grinding Pass; Initial Grinding 35 (a) Right End Larger 37 (b) Left End Larger 38 (c) Status of the System Prior to First Grind-- ing Pass 38 (d) First Grinding Pass and Continuous Passing 39 (i) Case I Material Removal Incomplete 40 (ii) Case ll Material Removal Complete 41 5. Rough Grinding 42 6. Finish Grinding 43 7. Sensing and Signaling the Roll Diameter 44 8. Cleaning Up the Roll Surface by Sparking Passes 49 9. Polishing Passes 50 E. Grinding aSecond Roll to the Same Diameter 52 F. An Alternative Embodiment 56 CROSS-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 methods and 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 8-hour shift. When each worn roll is removed from the mill, there is a need to have its surface re-finished or reground 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 grind any roll to a given contour, the roll must be supported by the grinding machine with the axis of the roll disposed parallel to the longitudinal path of travel followed by the grinding wheel as the latter moves lengthwise along the roll. Unless the roll axis is made parallel with the longitudinal path, the roll will be formed with an imprecise shape after grinding has been completed.

In most cases, uneven wear on the roll journals or necks makes it practically impossible for even skilled machinists to place the roll initially in the grinding machine in a position such that the axis of the roll is aligned parallel with the longitudinal path followed by the grinding wheel. Accordingly, it is the usual practice to place the roll in the machine in an approximately aligned position, to detect the degree of misalignment and thereafter to shift or adjust the roll as necessary to eliminate the misalignment and thus position the roll axis parallel to the longitudinal path of the grinding wheel.

SUMMARY OF THE INVENTION The principal objective of the present invention is to provide a new and advantageous method and apparatus for aligning the axis of a cylindrical workpiece parallel with the path of longitudinal movement of a tool in a turning machine. More specifically, it is an object of the invention to use a sensor to detect the degree of misalignment of one end of a cylindrical workpiece, to adjust such one end in a direction transverse to the longitudinal motion of a tool and, by utilizing the same sensor which initially detects misalignment, to sense and signal when the necessary corrective adjustment has been completed.

The invention thus is characterized by the provision of novel apparatus which needs only a single workpiece surface sensor to detect the degree of misalignment of a workpiece and to control shifting of the workpiece to a properly aligned position.

Another object is to obtain quickly and preferably automatically the complete operation of sensing misalignment of a workpiece axis and adjusting the workpiece in a turning machine to align the workpiece axis, irrespective of whether the workpiece is initially cylindrical or tapered, i.e., has equal or unequal diameters at its opposite ends.

A further object of the invention is to reduce the time consumed in conditioning the workpiece preparatory to detecting its misalignment with the workpiece surface sensor and, in particular, this is achieved by forming comparatively short gaging bands near the ends of the workpiece and by utilizing the gaging bands as the detecting surfaces for the sensor.

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 ap-

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3056240 *1 Sep 19602 Oct 1962Cincinnati Milling Machine CoAutomatic grinding machine
US3088250 *18 Oct 19617 May 1963Farrel Birmingham Co IncAutomated roll grinder
US3333370 *17 Nov 19641 Aug 1967Farrel CorpRoll grinding method
US3353302 *23 Nov 196521 Nov 1967Mesta Machine CoRoll grinders
US3391497 *17 Nov 19649 Jul 1968Farrel CorpRoll grinding and gaging apparatus
US3422583 *18 Apr 196621 Jan 1969Cincinnati Milling Machine CoMethod for positioning a roll on a roll grinder
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4467564 *29 Jun 198128 Aug 1984Veb WerkzeugmaschinenbauArrangement of a measurement controlling device in circular grinding machines
US4603514 *1 Feb 19855 Aug 1986Toyoda Koki Kabushiki KaishaMethod of grinding a workpiece having a cylindrical portion and shoulder portions
US4831782 *4 Nov 198623 May 1989The Pratt & Whitney Co., Inc.Apparatus for grinding a workpiece
US4928437 *24 Nov 198629 May 1990Werkzeugmaschinenfabrik TschudinMeans and method for resetting a cylindrical grinding machine
US4998383 *19 Mar 199012 Mar 1991Werkzeugmaschinenfabrik TschudinMeans for resetting a cylindrical grinding machine
US5830044 *12 Dec 19963 Nov 1998Sms Schloemann-Siemag AktiengesellschaftFor grinding a roll of a roll stand
US6397124 *11 May 199928 May 2002Falcon Machine Tools Co., Ltd.Interactive system between machine tool and operator
US6553880 *17 Jul 200129 Apr 2003Sarcos, LcMicromachining system
US6711829 *21 Sep 200130 Mar 2004Toyoda Koki Kabushiki KaishaMethod for measuring work portion and machining method
US6807836 *9 Oct 200226 Oct 2004Ormet CorporationMethod of applying a surface finish on a metal substrate and method of preparing work rolls for applying the surface finish
US68275308 Jul 20027 Dec 2004Self Leveling Machines, Inc.Symmetrical mill
US683242420 Apr 200421 Dec 2004Self Leveling Machines, Inc.Symmetrical mill
US8029338 *8 Mar 20044 Oct 2011Diamond Innovations, Inc.Grinding wheel for roll grinding application and method of roll grinding thereof
WO1987003237A1 *24 Nov 19864 Jun 1987Werkzeugmaschinenfabrik TschudProcess and device for resetting a cylindrical grinding machine
Classifications
U.S. Classification451/4, 451/9, 451/14, 451/142, 451/49, 451/46
International ClassificationB24B49/00, B24B5/04
Cooperative ClassificationB24B5/04, B24B49/00
European ClassificationB24B5/04, B24B49/00