EP0051657B1 - Method for surface grinding - Google Patents
Method for surface grinding Download PDFInfo
- Publication number
- EP0051657B1 EP0051657B1 EP81901379A EP81901379A EP0051657B1 EP 0051657 B1 EP0051657 B1 EP 0051657B1 EP 81901379 A EP81901379 A EP 81901379A EP 81901379 A EP81901379 A EP 81901379A EP 0051657 B1 EP0051657 B1 EP 0051657B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- belt
- workpiece
- abrasive
- width
- region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C11/00—Auxiliary processes in photography
- G03C11/12—Stripping or transferring intact photographic layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
- B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/08—Fastening or securing by means not forming part of the material of the label itself
- G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0208—Indicia
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0208—Indicia
- G09F2003/021—Indicia behind the front foil
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0225—Carrier web
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0225—Carrier web
- G09F2003/0226—Carrier sheet
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0225—Carrier web
- G09F2003/0229—Carrier roll
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/023—Adhesive
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/023—Adhesive
- G09F2003/0241—Repositionable or pressure sensitive adhesive
Definitions
- the present invention resides in an improved method for surface grinding by the use of abrasive belts, by which all parts of the belt are brought into contact with every point on the object to be ground, so that the workpiece itself continuously "dresses" the belt, and it is possible to produce work which is flat within required tolerances throughout the cutting life of the belt. This is accomplished by providing a complex relative motion between the workpieces and the belt, the motion having both linear and rotational components as set forth in the claims
- FIG. 1 identifies a hollow metallic workpiece having an upper surface to be ground. If this workpiece is moved past an abrasive belt in the direction of arrow 12, normal to the working edge of the belt, diagram 13 shows the relative lengths of time during which transverse elements A, B.... G of the belt engage the workpiece. It is obvious that elements A and G do over three times as much work as the other elements, and therefore wear down much faster. After a number of workpieces have passed the belt, the finished surfaces will no longer be flat, edges 14 being higher than the rest because the abrasive belt worn is lower in those regions.
- diagram 16 shows that most of the transverse elements of the belt engage the workpiece for the same intervals, but that the two outermost elements do not do so. In this arrangement grinding will result in high corners 17 after belt wear has begun to take place.
- a surface grinder 20 comprises a bed 21, a cutting head 22, and a work holder 23.
- Bed 21 includes a base 24 and a pedestal 25 secured thereto or integral therewith so that a flat upper plate 26 of the pedestal is horizontal.
- Base 24 extends horizontally beyond pedestal 25 to support work holder 23 for vertical adjustment on a set of four screw jacks, three of which are shown at 27, 30 and 31, arranged for simultaneous operation by means including a handwheel 32, a mechanical interconnection 33, and driving rods 34, 35, 36, to raise and lower an elongated horizontal carrier 37 for a worktable 40.
- Table 40 includes a cross slide 41 arranged for linear transverse adjusting movement in dovetail ways 42 by a hand wheel 43.
- Table 40 is mounted for movement longitudinally on carrier 37 by a carriage 44.
- Carrier 37 is formed as a trough to receive lubricoolant, when such is used, and deliver it for recirculation through a connection 45.
- the carrier includes a pair of horizontal ways 46, 47 on which carriage 44 is mounted for sliding motion past pedestal 25 by operation of a linear hydraulic motor 50 having a cylinder 51 secured to carrier 37 at 52, and a piston 53 secured to carriage 44.
- motor 50 may be actuated to move carriage 44 horizontally along ways 46, 47 past pedestal 25 in either direction.
- Table 40 includes a rotator 54 having a base 55, fixed to the top thereof as by a magnetic clutch in cross slide 41, and a working surface 56 to receive jigs for holding workpieces to be ground.
- Suitable hydraulic or electric motor means 57 is provided for causing rotation of working surface 56 with respect to base 55 about a vertical axis, under the control of conventional circuitry not shown.
- Cutting head 22 comprises an angle plate 60 having a flat horizontal member 61 formed with a plurality of concentric arcuate slots 62 for securement to plate 26 of pedestal 25 by fasteners 63, the arrangement being such as to permit pivotal adjustment of the angle plate on the pedestal.
- a vertical member 64 is reinforced in angle plate 60 by gussets 65, 66 and 67, and supports a housing 70 containing an abrasive belt structure including an endless abrasive belt 71 driven around a lower contact drum 72 by conventional drive, centering, and tensioning means, not shown, so that the belt and drum project at the bottom of a housing 73 to present a cylindrical abrasive surface moving with a component of rotation about the axis of drum 72.
- That axis is horizontal, and is skewed with respect to the direction of linear movement of the table, the angle of skew being adjustable at slots 62 and fasteners 63.
- the belt may be said to have a "working edge", which is a straight line parallel to the axis of drum 72 where the travel of the belt is at its lowest.
- splash guards can be provided as suggested at 73, 74, 75, 76 to extend the full length of bed 21.
- FIG. 6 Attention is now directed to Figure 6, in which adjustments available in setting up the apparatus are shown by broken lines, and motions occurring in operation of the grinder are shown by solid lines.
- Arrow 80 shows the pivotal adjustment available to head 22 by reason of slots 62.
- Arrow 81 shows the transverse movement made available for table 40 by hand wheel 43.
- Arrow 82 shows the vertical adjustment available to carrier 37 by hand wheel 32.
- Arrow 83 shows the movement of belt 70.
- Arrows 84, 84 show the linear movement of table 40 along ways 46, 47.
- Arrow 85 shows the rotary movement available to table 40 by operation of motor 57.
- a jig or holder (not shown) appropriate to the configuration of pieces to be ground in mass production is secured to surface 56 magnetically or by suitable clamps. Such pieces are typically the product of a previous machining or grinding step, and are interchangeably insertable in a suitable jig so that a surface to be ground flat is upward and horizontal, and so that only a few thousands of an inch need to be removed from that surface.
- the machine is shown in Figure 3 with table 40 at a first "loading" station, where a workpiece is manually loaded into the jig. Hand wheel 43 is rotated to center the jig on the longitudinal path of the carriage.
- a belt of suitable width and grit is inserted, centered, and tensioned in head 22, and the latter is pivotally adjusted at slots 62 to give the desired angle of skew between the axis of drum 72 and the direction of linear carriage movement.
- Hand wheel 32 is rotated to set the depth of cut for the belt as desired, the belt drive is initiated, and motors 57 and 50 are set in operation.
- Carriage 44 is now being driven to the left as seen in Figure 3, moving quite slowly, and motor 57 is causing rotation of the workpiece about a vertical axis at a considerably higher peripheral speed.
- motor 57 is causing rotation of the workpiece about a vertical axis at a considerably higher peripheral speed.
- any given point on the surface of the workpiece engages many different sites transversely of the belt in a complex pattern such that no belt site is cutting material for a longer interval than any other.
- a grinder as shown in Figures 3-5 has many precision components and is costly to build and maintain. For.many purposes the advantages of my invention can be obtained in a simplified embodiment shown, somewhat schematically, in Figures 7, 8, 9, and 10.
- a workpiece 11 which may, for example, be that shown in Figure 1, is mounted in any conventional fashion upon a table 100 capable of rotating about a vertical axis as suggested by the arrow 101 and rotated at either of two speeds by a rotary hydraulic motor 102 through a belt 103.
- Table 100 is mounted on a carriage 104 having vertical motion as indicated by the arrows 105, which may conveniently include a hydraulic feed for rapid action and a mechanical feed for fine action, suggested at 106 and 107.
- a cutting head 110 is positioned above table 100, and includes an abrasive belt 111 driven by suitable motor means not shown over upper and lower horizontal cylindrical drums 112 and 113.
- the belt is considerably narrower than the drums and at least the lower drum is of steel or other hard durometer material.
- a simple splash guard 114 of length determined by the maximum belt width may be mounted as suggested in Figure 9, to collect the swarf resulting from the grinding process, and may include a water curtain arrangement 115.
- Conventional driving and tensioning means are provided, as is a centering arrangement modified as will now be described.
- Figure 8 shows that upper drum 112 is mounted for slight pivotal movement about a vertical axis by operation of actuators 116 and 117 which pivot the drum in opposite directions, as suggested by the arrows 120 and 121: the extent of the motion is somewhat exaggerated in the figure.
- a first sensor 122 comprising a photocell 123 and a lamp 124 causes operation of actuator 116, when the edge of the abrasive belt reaches a limit of motion to the left, to pivot drum 112 in the direction of arrow 121
- a second sensor 125 comprising a photocell 126 and lamp 127 causes operation of actuator 117, when the edge of the abrasive belt reaches the limit of motion to the right, to pivot drum 112 in the direction of arrow 120.
- the operation of the grinder is as follows.
- the width of belt 111 is selected to be not much greater than the greatest transverse dimension of workpiece 11 taken through the axis of rotation, and sensors 130 and 131 are spaced accordingly.
- a workpiece 11 is mounted on table 100, which is then set in slow rotation.
- Belt 111 is placed in operation under the centering control of sensors 130 and 131, and therefore remains at substantially the same axial position along drum 113.
- Carriage 104 is raised until the workpiece almost engages the belt, and is then set into slow upward motion so that the belt makes a "plunge" cut directly into the top of the workpiece as the latter rotates.
- a third preferred embodiment of the invention is shown to comprise a cutting head 200 mounted over a workholder 201.
- Cutting head 200 is preferably like head 110 of Figures 7-9, and includes upper and lower drums 202 and 203 traversed by an abrasive belt 204. Conventional mounting, drive, and belt centering means not shown are included.
- a workpiece is mounted in any conventional fashion on a table 205, which is mounted on a carriage 206 and is capable of rotation about a vertical axis by a hydraulic motor 207 through a belt 210.
- Carriage 206 and motor 207 are mounted on the outer slide 211 of a nest 212 of such slides, to enable horizontal linear movement of carriage 206 in a direction parallel to the axis of drum 203 and hence to the working edge of belt 204.
- the inmost slide 213 of nest 212 is carried by a suitable support 214, and hydraulic means suggested at 215 cause movement of carriage 206 as indicated by the arrow 216, when such is desired.
- support 214 may be provided with rapid and fine vertical motions, suggested by the arrow 217.
- table 205 may be withdrawn from under cutting head 200 for mounting workpieces without interference, after which the workpiece can be moved under the cutter head by hydraulic motor 215. Thereafter the workpiece is raised and rough-cut as described above, while belt 204 remains centered. Vertical feed is then arrested.
- a special feature of the third embodiment lies in the fact that the workpiece can be withdrawn laterally from the belt while both are still in operation, this withdrawal being aligned with the working edge of the belt. It has been found that this final step increases both the flatness of the finished workpiece and the perfection of the dressing of the belt.
- the procedure comprises the steps of rotating the workpiece about an axis and simultaneously bringing about linear relative motion between the workpiece and the belt having at least a component aligned with the working edge of the belt.
- the belt is narrower than the axial dimension of the drums, and the linear motion is accomplished by causing oscillation of the belt axially on the drum.
Abstract
Description
- In the art of surface grinding, solid abrasive wheels are increasingly being replaced by endless abrasive belts passing around cylindrical driving drums, and the belts are very effective for removing metal efficiently.
- Where it is desired to produce a very flat surface of exact dimensions, however, in mass production of a number of identical objects for example, difficulty is encountered. In the movement of a succession of workpieces past an abrasive belt, certain portions across the width of the belt encounter metal for longer working intervals than others, and consequently are worn away more rapidly. Under such conditions the first fifty or so units may be flat within required tolerances, but thereafter the belt, while still usefully cutting metal, nevertheless produces a surface which increasingly departs from flatness with successive workpieces. Accordingly the belt must be replaced, even though it would still be capable of grinding perhaps 150 more pieces to a less exacting flatness tolerance.
- The foregoing is true whether the work is fed past the abrasive belt linearly, or rotated and fed into the belt along the axis of rotation. While the situation can in some measure be alleviated by differently positioning successive workpieces for grinding, this repeated jigging adjustment is not consonant with efficient mass production.
- The present invention resides in an improved method for surface grinding by the use of abrasive belts, by which all parts of the belt are brought into contact with every point on the object to be ground, so that the workpiece itself continuously "dresses" the belt, and it is possible to produce work which is flat within required tolerances throughout the cutting life of the belt. This is accomplished by providing a complex relative motion between the workpieces and the belt, the motion having both linear and rotational components as set forth in the claims
- In U.S. Patent 3,668,814 a surface grinding device is disclosed which teaches a traditional reciprocating belt system. In this disclosure, the workpiece is only permitted to rotate on a fixed axis and the belt is not permitted to move laterally on the rollers.
- Various advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages, and objects attained by its use, reference should be had to the drawing which forms a further part hereof, and to the accompanying descriptive matter, in which there are illustrated and described certain preferred embodiments of the invention. In the drawing, like reference numerals indicate corresponding parts throughout the several views.
- In the drawing, Figures 1 and 2 diagrammatically show characteristics of prior art procedures;
- Figure 3 is a front elevation of a first surface grinder for carrying out a first method according to the invention;
- Figure 4 is a plan view of the grinder of Figure 3 to a larger scale;
- Figure 5 is a side elevation of the grinder to a still larger scale, parts being broken away for clarity of illustration;
- Figure 6 is a diagram showing motions available in the grinder of Figure 3;
- Figure 7 is a schematic showing in side elevation of a second grinder for carrying out a second method according to the invention;
- Figure 8 is a fragmentary plan view of the grinder of Figure 7;
- Figure 9 is a fragmentary view in front elevation of the grinder of Figure 7;
- Figure 10 is a diagram showing a control arrangement for the grinder of Figures 7-9;
- Figure 11 is a schematic showing in front elevation of a third grinder for carrying out a third method according to the invention; and
- Figure 12 is a similar view of the structure of Figure 11 in side elevation.
- Preliminary consideration should first be given to Figures 1 and 2, which are presented to illustrate the problem my invention is intended to solve. In Figure 1, reference numeral 11 identifies a hollow metallic workpiece having an upper surface to be ground. If this workpiece is moved past an abrasive belt in the direction of arrow 12, normal to the working edge of the belt, diagram 13 shows the relative lengths of time during which transverse elements A, B.... G of the belt engage the workpiece. It is obvious that elements A and G do over three times as much work as the other elements, and therefore wear down much faster. After a number of workpieces have passed the belt, the finished surfaces will no longer be flat,
edges 14 being higher than the rest because the abrasive belt worn is lower in those regions. - If the work is moved in the direction of
arrow 15 against the working edge of the belt, diagram 16 shows that most of the transverse elements of the belt engage the workpiece for the same intervals, but that the two outermost elements do not do so. In this arrangement grinding will result inhigh corners 17 after belt wear has begun to take place. - In Figure 2, the workpiece 11 is rotated with respect to the working edge of the belt, as shown by the arrow 18, and is fed axially to the belt. Here again, the different transverse belt portions are subject to different degrees of wear, as suggested by diagram 19, and the finish on workpieces after an interval will have high circular ridges where belt elements C and N have been worn down. The present invention minimizes these effects.
- Turning now to Figures 3-5, a
surface grinder 20 comprises abed 21, acutting head 22, and awork holder 23.Bed 21 includes abase 24 and apedestal 25 secured thereto or integral therewith so that a flatupper plate 26 of the pedestal is horizontal.Base 24 extends horizontally beyondpedestal 25 to supportwork holder 23 for vertical adjustment on a set of four screw jacks, three of which are shown at 27, 30 and 31, arranged for simultaneous operation by means including ahandwheel 32, amechanical interconnection 33, and drivingrods horizontal carrier 37 for aworktable 40. - Table 40 includes a
cross slide 41 arranged for linear transverse adjusting movement indovetail ways 42 by ahand wheel 43. Table 40 is mounted for movement longitudinally oncarrier 37 by acarriage 44. -
Carrier 37 is formed as a trough to receive lubricoolant, when such is used, and deliver it for recirculation through aconnection 45. The carrier includes a pair ofhorizontal ways 46, 47 on whichcarriage 44 is mounted for sliding motion pastpedestal 25 by operation of a linearhydraulic motor 50 having acylinder 51 secured tocarrier 37 at 52, and a piston 53 secured tocarriage 44. By conventional hydraulic circuitry, not shown,motor 50 may be actuated to movecarriage 44 horizontally alongways 46, 47past pedestal 25 in either direction. - Table 40 includes a
rotator 54 having abase 55, fixed to the top thereof as by a magnetic clutch incross slide 41, and a workingsurface 56 to receive jigs for holding workpieces to be ground. Suitable hydraulic or electric motor means 57 is provided for causing rotation of workingsurface 56 with respect tobase 55 about a vertical axis, under the control of conventional circuitry not shown. -
Cutting head 22 comprises anangle plate 60 having a flathorizontal member 61 formed with a plurality of concentricarcuate slots 62 for securement toplate 26 ofpedestal 25 byfasteners 63, the arrangement being such as to permit pivotal adjustment of the angle plate on the pedestal. A vertical member 64 is reinforced inangle plate 60 bygussets housing 70 containing an abrasive belt structure including an endless abrasive belt 71 driven around alower contact drum 72 by conventional drive, centering, and tensioning means, not shown, so that the belt and drum project at the bottom of ahousing 73 to present a cylindrical abrasive surface moving with a component of rotation about the axis ofdrum 72. That axis is horizontal, and is skewed with respect to the direction of linear movement of the table, the angle of skew being adjustable atslots 62 andfasteners 63. When the depth of cut is only a few thousands of an inch, the belt may be said to have a "working edge", which is a straight line parallel to the axis ofdrum 72 where the travel of the belt is at its lowest. - It will be appreciated that if wet grinding is to be carried on, suitable splash guards can be provided as suggested at 73, 74, 75, 76 to extend the full length of
bed 21. - Attention is now directed to Figure 6, in which adjustments available in setting up the apparatus are shown by broken lines, and motions occurring in operation of the grinder are shown by solid lines. Arrow 80 shows the pivotal adjustment available to head 22 by reason of
slots 62. Arrow 81 shows the transverse movement made available for table 40 byhand wheel 43. Arrow 82 shows the vertical adjustment available tocarrier 37 byhand wheel 32. Arrow 83 shows the movement ofbelt 70.Arrows ways 46, 47. Arrow 85 shows the rotary movement available to table 40 by operation ofmotor 57. -
- The operation of the grinder is as follows. A jig or holder (not shown) appropriate to the configuration of pieces to be ground in mass production is secured to surface 56 magnetically or by suitable clamps. Such pieces are typically the product of a previous machining or grinding step, and are interchangeably insertable in a suitable jig so that a surface to be ground flat is upward and horizontal, and so that only a few thousands of an inch need to be removed from that surface. The machine is shown in Figure 3 with table 40 at a first "loading" station, where a workpiece is manually loaded into the jig.
Hand wheel 43 is rotated to center the jig on the longitudinal path of the carriage. A belt of suitable width and grit is inserted, centered, and tensioned inhead 22, and the latter is pivotally adjusted atslots 62 to give the desired angle of skew between the axis ofdrum 72 and the direction of linear carriage movement.Hand wheel 32 is rotated to set the depth of cut for the belt as desired, the belt drive is initiated, andmotors -
Carriage 44 is now being driven to the left as seen in Figure 3, moving quite slowly, andmotor 57 is causing rotation of the workpiece about a vertical axis at a considerably higher peripheral speed. As the workpiece is displaced and rotated under the belt, any given point on the surface of the workpiece engages many different sites transversely of the belt in a complex pattern such that no belt site is cutting material for a longer interval than any other. - When the table reaches the end of its stroke it has reached a second "loading" station, where the finished piece can be unloaded and another added for movement past the belt in the opposite direction. This arrangement is one in which the work itself "dresses" the abrasive surface, keeping it everywhere the same thickness, so that the workpiece is given a truly flat finish in which the scratch pattern is well confused and no extended scratches exist at the surface for later trouble with minor leaks past a sealing surface.
- It will be evident that successive pieces ground on this machine will all meet flatness tolerances because the abrasive belt is being worn uniformly. If dimensional tolerances are also critical, suitable small changes in the level of
carrier 37 may be made to compensate for wear of the abrasive and to keep dimensions acceptable. - A grinder as shown in Figures 3-5 has many precision components and is costly to build and maintain. For.many purposes the advantages of my invention can be obtained in a simplified embodiment shown, somewhat schematically, in Figures 7, 8, 9, and 10. Here a workpiece 11, which may, for example, be that shown in Figure 1, is mounted in any conventional fashion upon a table 100 capable of rotating about a vertical axis as suggested by the arrow 101 and rotated at either of two speeds by a rotary hydraulic motor 102 through a
belt 103. Table 100 is mounted on acarriage 104 having vertical motion as indicated by thearrows 105, which may conveniently include a hydraulic feed for rapid action and a mechanical feed for fine action, suggested at 106 and 107. - A cutting
head 110, generally likehead 22 of Figures 3-5, is positioned above table 100, and includes anabrasive belt 111 driven by suitable motor means not shown over upper and lower horizontalcylindrical drums simple splash guard 114 of length determined by the maximum belt width may be mounted as suggested in Figure 9, to collect the swarf resulting from the grinding process, and may include awater curtain arrangement 115. Conventional driving and tensioning means are provided, as is a centering arrangement modified as will now be described. - Figure 8 shows that
upper drum 112 is mounted for slight pivotal movement about a vertical axis by operation ofactuators arrows 120 and 121: the extent of the motion is somewhat exaggerated in the figure. Afirst sensor 122 comprising aphotocell 123 and alamp 124 causes operation ofactuator 116, when the edge of the abrasive belt reaches a limit of motion to the left, to pivotdrum 112 in the direction of arrow 121, and asecond sensor 125 comprising aphotocell 126 andlamp 127 causes operation ofactuator 117, when the edge of the abrasive belt reaches the limit of motion to the right, to pivotdrum 112 in the direction ofarrow 120. - While this arrangement is satisfactory for centering a full-width belt in the cutting
head 22 of the first embodiment, it has been modified for use with the narrower belts of the second embodiment by the provision offurther sensors photocells lamps belt 111, and centered with respect to the length ofdrums actuators sensors sensors - In this embodiment of the invention no component for moving table 100 in a direction orthogonal to its axis of rotation is necessary.
- The operation of the grinder is as follows. The width of
belt 111 is selected to be not much greater than the greatest transverse dimension of workpiece 11 taken through the axis of rotation, andsensors Belt 111 is placed in operation under the centering control ofsensors drum 113.Carriage 104 is raised until the workpiece almost engages the belt, and is then set into slow upward motion so that the belt makes a "plunge" cut directly into the top of the workpiece as the latter rotates. - When the desired amount of metal has been removed from the workpiece, the vertical movement of the carriage is stopped, the rotary speed of the table is increased, and centering control of the belt is transferred to
sensors Belt 111 now moves back and forth across the full width ofdrums - Referring now to Figures 11 and 12, a third preferred embodiment of the invention is shown to comprise a cutting
head 200 mounted over aworkholder 201. Cuttinghead 200 is preferably likehead 110 of Figures 7-9, and includes upper andlower drums abrasive belt 204. Conventional mounting, drive, and belt centering means not shown are included. - A workpiece is mounted in any conventional fashion on a table 205, which is mounted on a
carriage 206 and is capable of rotation about a vertical axis by ahydraulic motor 207 through abelt 210.Carriage 206 andmotor 207 are mounted on theouter slide 211 of anest 212 of such slides, to enable horizontal linear movement ofcarriage 206 in a direction parallel to the axis ofdrum 203 and hence to the working edge ofbelt 204. Theinmost slide 213 ofnest 212 is carried by asuitable support 214, and hydraulic means suggested at 215 cause movement ofcarriage 206 as indicated by thearrow 216, when such is desired. As in Figures 7 and 9,support 214 may be provided with rapid and fine vertical motions, suggested by thearrow 217. - The general operation of this embodiment of the invention is as that described for the second embodiment: two added factors are present however, which must be mentioned specifically.
- As a factor of convenience, table 205 may be withdrawn from under cutting
head 200 for mounting workpieces without interference, after which the workpiece can be moved under the cutter head byhydraulic motor 215. Thereafter the workpiece is raised and rough-cut as described above, whilebelt 204 remains centered. Vertical feed is then arrested. - A special feature of the third embodiment lies in the fact that the workpiece can be withdrawn laterally from the belt while both are still in operation, this withdrawal being aligned with the working edge of the belt. It has been found that this final step increases both the flatness of the finished workpiece and the perfection of the dressing of the belt.
- From the foregoing it will be evident that I have invented a new procedure for using abrasive belts for production grinding of surfaces of great flatness with unprecedented economy of belt usage, as well as three different structures by which the inventive procedure may be carried out. The procedure comprises the steps of rotating the workpiece about an axis and simultaneously bringing about linear relative motion between the workpiece and the belt having at least a component aligned with the working edge of the belt. In one of the embodiments the belt is narrower than the axial dimension of the drums, and the linear motion is accomplished by causing oscillation of the belt axially on the drum.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81901379T ATE40963T1 (en) | 1980-05-15 | 1980-12-23 | PROCESS FOR SURFACE GRINDING. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14990580A | 1980-05-15 | 1980-05-15 | |
US149905 | 1980-05-15 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0051657A1 EP0051657A1 (en) | 1982-05-19 |
EP0051657A4 EP0051657A4 (en) | 1984-08-08 |
EP0051657B1 true EP0051657B1 (en) | 1989-03-01 |
Family
ID=22532302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81901379A Expired EP0051657B1 (en) | 1980-05-15 | 1980-12-23 | Method for surface grinding |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0051657B1 (en) |
JP (2) | JPS57500598A (en) |
AU (1) | AU545860B2 (en) |
CA (1) | CA1158441A (en) |
DE (1) | DE3072143D1 (en) |
FI (1) | FI70162C (en) |
WO (1) | WO1981003301A1 (en) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US915714A (en) * | 1905-10-12 | 1909-03-16 | L Oxyhydrique Internationale Sa | Pressure-burner. |
US1075227A (en) * | 1910-06-30 | 1913-10-07 | Durham Duplex Razor Company | Machine for truing honing-wheels. |
US1262540A (en) * | 1917-10-01 | 1918-04-09 | Julius Miller | Grinding-machine. |
US1926779A (en) * | 1928-02-06 | 1933-09-12 | Pratt & Whitney Co | Rotary table grinding machine |
US2996848A (en) * | 1957-03-14 | 1961-08-22 | Earl A Thompson | Grinding method and apparatus therefor |
US3154896A (en) * | 1962-07-30 | 1964-11-03 | Norton Co | Abrading honeycomb metal |
US3552067A (en) * | 1969-01-17 | 1971-01-05 | Murray Way Corp | Abrasive belt detector |
US3665650A (en) * | 1969-10-22 | 1972-05-30 | Murray Way Corp | Abrasive belt control apparatus and method |
US3668814A (en) * | 1970-03-30 | 1972-06-13 | Minnesota Mining & Mfg | Surface grinding device |
US3816998A (en) * | 1970-05-18 | 1974-06-18 | Timesavers Inc | Method of and apparatus for rapidly abrading metal workpieces |
US3654738A (en) * | 1970-09-11 | 1972-04-11 | Timesavers Sanders | Method of and apparatus for effecting superior sanding |
US3888050A (en) * | 1974-02-19 | 1975-06-10 | Timesavers Inc | Method of and apparatus for rapidly and simultaneously abrading metal workpieces in preselected plural numbers |
US3971166A (en) * | 1975-06-09 | 1976-07-27 | Timesavers, Inc. | Belt position sensor for wide belt sanding machine |
US4021970A (en) * | 1976-02-19 | 1977-05-10 | Acme Mfg. Company | Wide abrasive belt tension and oscillation assembly |
-
1980
- 1980-12-23 JP JP81501739A patent/JPS57500598A/ja active Pending
- 1980-12-23 EP EP81901379A patent/EP0051657B1/en not_active Expired
- 1980-12-23 AU AU71789/81A patent/AU545860B2/en not_active Ceased
- 1980-12-23 WO PCT/US1980/001711 patent/WO1981003301A1/en active IP Right Grant
- 1980-12-23 JP JP56501739A patent/JPS6052907B2/en not_active Expired
- 1980-12-23 DE DE8181901379T patent/DE3072143D1/en not_active Expired
-
1981
- 1981-02-23 CA CA000371467A patent/CA1158441A/en not_active Expired
-
1982
- 1982-01-13 FI FI820109A patent/FI70162C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI70162B (en) | 1986-02-28 |
JPS6052907B2 (en) | 1985-11-21 |
FI70162C (en) | 1986-09-15 |
JPS56500729A (en) | 1981-05-28 |
JPS57500598A (en) | 1982-04-08 |
DE3072143D1 (en) | 1989-04-06 |
AU7178981A (en) | 1981-12-07 |
AU545860B2 (en) | 1985-08-01 |
EP0051657A4 (en) | 1984-08-08 |
FI820109L (en) | 1982-01-13 |
EP0051657A1 (en) | 1982-05-19 |
WO1981003301A1 (en) | 1981-11-26 |
CA1158441A (en) | 1983-12-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4274231A (en) | Method and apparatus for dressing a grinding wheel | |
US4260001A (en) | Woodworking machines | |
KR20010007448A (en) | Bilateral automatic machine for edge-machining plates of glass, stone-like materials and the like | |
GB2174937A (en) | Grinding machine with a reciprocable column for work supporting devices | |
US4062150A (en) | Centerless grinding method and device using same | |
US3305974A (en) | Grinding machine | |
JPS6234761A (en) | Reciprocating cycle vertical hexa-axial surface griding machine and grinding method thereby | |
US4407096A (en) | Method and apparatus for surface grinding | |
EP0051657B1 (en) | Method for surface grinding | |
CA1317769C (en) | Ultra-precision grinding machine | |
JPH08318456A (en) | Spindle tapered hole re-boring device | |
US4203261A (en) | Abrasive belt machining apparatus | |
CN211760465U (en) | Multi-angle adjustable grinding head machining grinding machine with double-upright-column structure | |
KR100249378B1 (en) | Lapping machine for manufacturing floating seal | |
JPH0521314Y2 (en) | ||
CN110802479A (en) | Flat sand machine | |
GB2256822A (en) | Rounding off the edges of semiconductor discs | |
CN104308696A (en) | Special grinding machine for workpiece tank bottom | |
CN220561126U (en) | Panel location deburring device for machining | |
CN210115682U (en) | Machining cutting equipment | |
CN220561172U (en) | High-precision numerical control roller grinding machine | |
CN215148007U (en) | Quick workpiece changing structure of high-precision polishing machine | |
US3202057A (en) | Gear finishing machine with work transfer mechanism | |
JP2670506B2 (en) | Flat honing method, work holding device, and honing machine | |
JPH03294163A (en) | Curved surface working device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT CH DE FR GB LU NL SE |
|
17P | Request for examination filed |
Effective date: 19820518 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ABRASIVE ENGINEERING & MANUFACTURING, INC. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT CH DE FR GB LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19890301 |
|
REF | Corresponds to: |
Ref document number: 40963 Country of ref document: AT Date of ref document: 19890315 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3072143 Country of ref document: DE Date of ref document: 19890406 |
|
ET | Fr: translation filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19891231 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19901213 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19901220 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19901221 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19901227 Year of fee payment: 11 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PUE Owner name: TIMEACQUISITION, INC. |
|
NLS | Nl: assignments of ep-patents |
Owner name: TIMEACQUISITION, INC. TE MINNEAPOLIS, MINNESOTA, V |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19911223 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19911224 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19911231 Ref country code: CH Effective date: 19911231 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19911231 Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19920213 Year of fee payment: 12 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19920831 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19930701 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19930901 |
|
EUG | Se: european patent has lapsed |
Ref document number: 81901379.8 Effective date: 19920704 |