US2658499A

US2658499A - Grinding wheel dressing mechanism

Info

Publication number: US2658499A
Application number: US222433A
Authority: US
Inventors: Hoglund Nils
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-04-23
Filing date: 1951-04-23
Publication date: 1953-11-10
Anticipated expiration: 1970-11-10

Description

Nov. 10, 1953 HOGLUND 2,658,499

GRINDING WHEEL DRESSING MECHANISM Filed April 25, 1951 5 Sheets-Sheet l INVENTOR. Nils Hoglund N. HOGLUND GRINDING WHEEL DRESSING MECHANISM Nov. 10, 1953 5 Sheets-Sheet 2 Filed April 25, 1951 JNVENTOR. Nil: HogZunol BY AT RNEY Nov. 10, 1953 N. HOGLUND 2,658,499

GRINDING WHEEL DRESSING MECHANISM Filed April 25, 1951 5 Sheets-Sheet 3 INVENTOR.

Nil: HOgZ n ATT NEY Nov. 10, 1953 HQGLUND 2,658,499

GRINDING WHEEL- DRESSING MECHANISM Filed April 23, 1951 5 Sheets-Sheet 4 Fig. 4

' INVENTOR.

Nils Hglund ATT NEY NOV. 10, 1953 L D 2,658,499

GRINDING WHEEL DRESSING MECHANISM Filed April 25, 1951 5 Sheets-Sheet 5 l 28 41 4'0 5 Z9 Z7 0 IN VEN TOR.

BY Nib hoglund WMM a M AT RNEY Patented Nov. 10, 1953 UNITED STATES OFFICE GRINDING WHEEL DRESSING MECHANISM Nils Hoglund, Union, N. J.

Application April 23, 1951, Serial No. 222,433

Claims. 1

My invention relates to grinding wheel dressing apparatus and more particularly to universal contour dressers for grinding wheels for cylindrical grinders.

In some forms of conventional grinding wheel dressing equipment where the contour of a template is reproduced on the grinding surface of a grinding wheel on a reduced scale, a pantograph arrangement of complicated design is employed to transfer the contour from the template to the surface of the wheel being dressed as the dressing tool is moved across the surface of the grinding wheel. Such pantograph equipment involves the use of complicated. link mechanism which is subject to inaccuracies due to wear introduced by the forces encountered in this type of work. Usually this older type of wheel dressing mechanism can be employed only on smaller grinding wheels.

Wheel dressing devices of conventional design are usually permanently fixed to the grinding equipment and are heavy and bulky. Also, where wheel dressing devices are permanently mounted on the grinding wheel apparatus, the positioning of the dresser, unless complicated supporting mechanism is provided, interferes with the full usage of the machine capacity and frequently realignments are necessary to insure accuracy of the work. With conventional dressing equipment it is difficult to provide contours where sharp or undercut contours are required on the grinding wheel. It is also difiicult in devices available to dress to sharp angles and in some cases to dress more than a one radius contour.

Further, templates are not in some cases easily replaced.

In these conventional types of dressers experienced operators are required to handle equipment in order to provide accurate dressing.

in most devices of the kind described the coordinates of the contour cannot be reduced independently of each other. This, in certain cases, is a disadvantage.

An object of my invention therefore is to provide improved simple and effective grinding wheel dressing and forming devices.

Another object of my invention is to provide such a device which dispenses with the need for pantograph arrangements for producing on reduced scale the contour of the template on the grinding wheel.

A further object of my invention is to provide a device of the kind described which can be easily and quickly moved from machine to machine and quickly set up to accommodate the dresser.

A further object of my invention is to provide a device of the kind described in which the dressing tool can be manipulated to produce contours of small radius or contours having sharp angles or which are undercut, or which have more than one radius.

A further object of my invention is to provide a device of the kind described which, while extremely accurate, is simple in operation and which can be effectively operated by an unskilled operator.

A still further object of my invention is to provide a grinding wheel dressing mechanism which can be left on the grinder on the side of the work table while the grinding operation is being performed, thereby saving the time required for removal of the mechanism during dressing operations.

A still further object of my invention is to provide a light weight compact and well-balanced contour dresser in which a quick change from one contour to another can be readily made.

Another object of my invention is to provide a dressing mechanism in which each coordinate of the contour is reduced independently of the other coordinate.

A still. further object of my invention is to provide a template follower or stylus and a diamond dressing tool which can be rotated together through a parallel mechanism, retaining the most favorable relationship between the contour and point of diamond.

These and other objects will appear hereinafter.

Briefly, in accordance with my invention, I provide an elongated base member having slidably mounted thereon a cross movement slide which carries the dressing tool across the face of the grinding wheel being dressed. This cross slide slidably supports thereon a first or tool slide having movement transversely of the movement of the cross slide member on the base, permitting the dressing tool to be moved toward and from the surface being dressed. This tool slide rotatably supports a tool supporting member which can be rotated about a vertical axis whereby the tool may be positioned normal to the contour being formed. Mounted at one end of the base is a second or template slide which supports the template having a contour similar to that being dressed but of increased size, the template being flat and supported in a plane parallel to the base. The cross slide member and second slide have an interlocking relatively sliding engagement whereby when the template slide is moved on the base toward and from the operator the cross movement slide is made to move or parallel to the axis of rotation of the wheel being dressed. This template slide has a ratio slide guide assembly operatively connected between it and the base to cause simultaneous movement or" the template slide normal to its movement toward and from the operator in order to produce the necessary movement of the cross slide member carrying the tool slide.

Mounted above the first slide member supporting the tool is a housing slidably supporting an arm carrying at its free end a stylus or template follower. The end of the arm within the housing carries a ratio slide mechanism coopcrating with the tool slide member for causing movement of the tool slide toward and from the work piece being dressed. Thus, as the stylus follows the contour on the template, the arm moves transversely of the tool slide and due to the ratio slide connection to the tool slide causes the tool to move toward and from the grinding wheel but at a reduced rate compared to the movement of the stylus.

Connected between the stylus support and the tool support is a parallel link arrangement which provides rotation of the tool in the same manner as rotation of the stylus so that as the stylus is positioned normal to the surface of the contour on the template so the tool is positioned normally of the contour of the surface being dressed.

In operation, the template slide is moved manually back and forth by the operator, which causes movement of the cross slide member across the face of the wheel being dressed. As the stylus follows the contour of the template, the dressing tool is made to move toward and from the surface being dressed to reproduce the contour on a smaller scale on the wheel being dressed. Rotation of the tool to position it normally of the contour being dressed is controlled by the operator as he guides the stylus along the contour of the template. If the template slide alone is moved toward and from the operator, it will cause the dressing tool to move parallel to the axi of the wheel being dressed, but it will not move the tool toward and from the surface of the wheel unless the arm supporting the stylus is moved toward and from a line parallel to the movement of the cross slide member. Thus, movements of the tool along the two coordinates are separately controlled. This has certain advantages in operation of the tool.

In the drawings Fig. 1 is a perspective view of the front side of a grinding wheel dressing mechanism made in accordance with my invention; Fig. 2 is a perspective of the other side of Fig. 1; Fig. 3 is a plan view with parts broken away to show details of construction; Fig. 4 is a side elevation of Fig. 1 with parts broken away to show details of operation; Fig. 5 is a rightcnd view in elevation of Fig. 4; Fig. 6 is a perspective view of the base and cross movement slide with parts removed to show the slide guides upon which the tool slide and the template slide are mounted; Fig. 7 is a section along line 1'l of Fig. 4; Fig. 8 is an underside view of the template slide showing the ratio slide assembly; and Fig. 9 is a section taken along line 99 of Fig. 3 to show the relationship of the ratio slide assembly and tool slide for controlling the movement of the tool slide.

General description Referring to Figs. 1, 2 and 6, an apparatus made in accordance with my invention includes an elongated base In which can be secured to the grinding wheel apparatus by clamps or a magnetic clutch and upon which is mounted cross slide member H movable along the base and across the surface of the wheel to be dressed. Mounted on the top of this slide H is a. frame l2 supporting the housing IS. The slide H, frame 42 and housing l3 support the first slide or tool upport slide i4 pivotally supporting tool support IE to which is detachably secured the dressing diamond I5. Other mechanism to be described is enclosed within the housing [3 to control movement of the slide 14 toward and from the grinding wheel being dressed.

Slidably mounted at one end of the base I!) is a second slide of the template slide ll supporting in a horizontal plane the template iii. The mechanism for slidably supporting the tem plate slide and the relationship between this slide and slide H to cause movement of slide II normal to the movement of slide IT, which is toward and from the operator, will be described in detail below.

A stylu or template follower i9 is rotatably supported on an arm 28 which is mounted to slide back and forth within the housing [3 and parallel to the movement of the slide II. A ratio slide and yoke mechanism to be described and mounted within housing i3 is connected between the tool slide I 4 and the arm 20 to cause movement of the tool I 6 toward and from the wheel being dressed when the arm 28 moves into and out of the housing 13 as the stylus I9 follows contour of template I 8.

To rotate the stylus and the tool dressing the wheel so that the cutting tool is normal to the contour being dressed, I provide a parallel mechanism shown generally at 2!, which is connected through a link crank 22 to rotate the support 15.

Base and cross movement slide Referring to Figs. 6 and '7, as described above, there is mounted on the base it! the cross slide member H which has movement longitudinally of the base and parallel to the axis of the wheel being dressed. The base E6, as shown in Fig. 7, supports thereon a slide guide 25. The slide Ii is mounted thereon by means of ball races 2% and 2? and ball bearing and retainer assemblies 28 and 2t. Mounted on the top of slide II are two slide guides 39 and 3| which support template and tool slides to move transversely of the movement of slide II. A dust shield 32 is secured to the slide II to protect the underside of the template slide during operation. The base is provided with an extension 3? which supports a pin and yoke to be described, which cooperate with a ratio slide secured to the underside of the template slide. This construction will be described below.

Contour (diamond) tool slide Referring now to Figs. 1, 2, 3, 4 and 7, the contour of diamond tool slide M is slidably supported on the slide guide 3| by the ball races 35 and 35 and ball bearing and

retainer assemblies

31 and 38. This assembly permits movement of the tool slide i transversely of the movement of the slide II. Mounted at the end of the slide I4 is the tool support l5 which rotates about a vertical axis on pin l5, which is preferably ball bearing supported. The support I5 has an extension 39 thereon for engagement with the link or bell crank 22 for purposes to be described. The slide ea -49o M .has extending through it an aperture is for receiving the pin M of the yoke of the ratio slide assembly to be described.

Template slide Referring now to Figs. 3, 4, 5 and 8, the template slide il is partially supported on slide by means of the ball bearing and retainer assemblies t5, and it. Thus, it will be observed the template slide I? and slide H while slidaloly connected to permit movement of the template slide transversely of the base I l, the slide H and template slide ll must move together in a plane parallel to the axis of the wheel being dressed.

This is accomplished in the following manner.

Mounted on the underside of the template slide ll is an inclined ratio slide guide t! whiohis engaged through ball bearing and retainer assemblies 18 and M by a yoke 59, which is rotatably mounted on a pin 5b in extension 3! When the handle ii is engaged by an operator and the slide ll caused to move toward and from the operator, the yoke and inclined slide d1 cause the slide to have a movement transverse to the back and forth movement so that, in effect, as the slide IT is moved toward and from the operator, it as well as slide If is caused to move from left to right or parallel to the axis of the wheel being dressed. As the slide ii is moved away from the operator, the slide ll and slide member I l are also moved toward the right to cause the tool to move from left to right across the wheel being dressed. As the template slide is moved toward the operator,

the tool is caused to move from right to left across the surface of the wheel being dressed. It is observed that the slide ll moves through a distance several times greater than that through which the slide it moves in a direction normal to the direction of slide [1. The ratio of this movement is controlled by the angle of inclination of the slide guide ll.

Ratio slicle assembly The mechanism for controlling movement of the tool slide is best shown in Figs. 3, 4, '7 and 9. The arm 25, which slides into and out of housing l3, has secured to it a slide mounted in ball recesses 55 and. [fl and ball bearing and retainer assemblies 5t and 59. Secured to the underside of this slide is an inclined slide guide fill which in turn is engaged by a yoke 6! through ball races t2 and (it and ball bearing and

retainer assemblies

6 and 65. This yoke has secured to it the pin 4! inserted within the aperture all of slide Hi. In-

asmuch as the slide guide (it is at an angle to the arm at, as the arm 2% is moved into and out of the housing it causes movement of the pin toward and from the wheel being dressed through causing movement of the slide it toward carrying tool iii toward and from the work piece or grinding wheel being dressed. The degree of movement of the arm Ell into and out of the housing is controlled by the contour on the template l8, that is, as the template follower it moves toward and from the housing it as it follows the contour surface of the template Hi, the slide I4 is moved toward and from the wheel being dressed. The inclination of the slide guide 563 determines the reduction in the rate of movement of diamond [6 relative to movement of follower Hi. This movement is independent of movement of slide 5 1.

Angle control of tool Reference is made to Figs. 1, 2, 3 and 4. As described, above, it is desirable to position the dressing 'tool at an angle normal to the contour being dressed. This is accomplished by providing thepin :10 on arm 20 on which the template follower or stylus I9 is detachably and rotatably supported by bracket [2. A hand wheel ii and a parallel system comprising links 13 and i l, ring 15, links 1E and IT, crosspiece l8 rotatably mounted on pin [9 to which the arm 8! is secured, and link 22 connected between the bell crank or arm 88 and bell crank or arm 39. Thus, as the wheel H is rotated to place the template follower H] at an angle normal to the contour of template [8, the movement .is transferred through the parallel mechanism to position the tool it at an angle normal to the contour on the wheel being dressed.

Operation When it is desired to dress a grinding wheel or to form a contour thereon, the apparatus is mounted on the bed of the grinding wheel apparatus with the diamond adjacent the surface being dressed. The template with the desired contour is then placed on the template slide and the mechanism adjusted toward and from the wheel being dressed to position the diamond in contact therewith. The operator grasps the handle ll with his left hand and the adjustment wheel H with his right and moves the slide toward and from him at the same time guiding the template follower or stylus l9 along the contour of the template it.

As the slide [1 moves away from the operator, the ratio slide guide ll and yoke 5s cause movement of the slide H from left to right. Slide l I, being connected with slide ll by the slide guide 39, is caused to move across the surface of the wheel being dressed from left to right. As the template follower follows the contour of the template E8, the arm it moves into and out of the housing l3 causing the slide attached to the arm to move the yoke es and pin 4| engaging the slide I l toward and from the grinding wheel, carrying with it the slide i l supporting the tool It. The movement toward and from the wheel is determined by the contour on the template. As the arm 2! moves into housing E3, the slide it moves toward the wheel being dressed. The wheel H may be rotated to position the cutting tool l6 normal to the surface being dressed.

It will thus be observed that the apparatus is simple and rugged, does not need the services of a skilled operator, and has the advantage of independent coordinate movements of the tool. The only link mechanism utilized is the parallel mechanism on which no great forces are applied, all of the large forces being absorbed by the rugged construction of the slides which do not require link mechanisms and which are ruggedly supported in a stable fashion on the various slides mounted on the base.

I claim:

1. A grinding wheel dressing apparatus including a base, a slide member movable in one direction along said base, a pair of slide guides mounted on and extending transversely of said slide member and said one direction, a first slide mounted on one of said slide guides and a dressing tool mounted at the end of said first slide, and a second slide engaging another of said slide guides and said base for supporting a template, a housing on said slide member, and an elongated member mounted for movement into and out of said housing andsupporting at its free end a template follower, a ratio slide mechanism connected between the inner end of said elongated member and said first slide for causing movement of said first slide transversely of said slide member as said elongated member moves into and out of said housing, and a ratio slide mechanism connected between said base and said second slide for controlling movement of said slide member as said second slide is moved transversely of the direction of movement of said slide member.

2. A grinding wheel dressing apparatus including a base, a slide member mounted on and movable in one direction along said base, a pair of slide guides mounted on and extending transversely of the movement of said slide member, a first slide mounted on one of said slide guides and a dressing tool mounted on said slide, and a second slide engaging another of said slide guides and said base and supporting a template, an elongated arm member mounted on said slide member and slidable along said member parallel to the movement of said slide member, said arm supporting at one end a template follower contacting said templet, means connecting the otl.- er end of said arm and said first slide for causing movement of said first slide transversely of the movement of said slide member as said arm moves along said slide member, and a ratio slide mechanism connected between said base and said second slide for controlling movement of said slide member as said second slide is moved transversely of said base.

3, A grinding wheel dressing apparatus including a base, a slide member mounted on and movable in one direction along said base, a pair of slide guides mounted on and extending transversely of the movement of said slide member, a first slide mounted on one of said slide guides and a dressing tool mounted on said slide, and a second slide engaging another of said slide guides and said base and supporting a template, an elongated arm member mounted on said slide member and movable parallel to the movement of said slide member, said arm supporting at its one end a template follower contacting said templet, means connecting the other end of said arm and said first slide for causing movement of said first slide transversely of said slide member as said arm moves along its path of travel, and a ratio slide mechanism connected between said base and said second slide for controlling movement of said slide member as said second slide is moved transversely of said base, said ratio slide mechanism including a slide guide positioned at an angle to the direction of movement of said slide member and a yoke slidably engaging said last slide guide.

4. A grinding wheel dressing apparatus including a base, a slide member movable in one direction along said base, a first slide mounted on said slide member and a dressing tool mounted on said slide said first slide being movable transversely of said one direction, and a secondslide on said base for supporting a template, and an elongated member mounted on said slide member for movement along said slide member and supporting at one end a template follower for contacting said templet, a ratio slide mechanism connected between one end of said elongated member and said first slide for causing movement of said first slide transversely of said slide member as said elongated member moves along its path of travel, the ratio slide assembly connected between the first slide and said elongated member including an inclined slide guide on said elongated member and. a yoke slidably engaging said inclined slide guide, said yoke also engaging said first slide.

5. A grinding wheel dressing apparatus including a base, a slide member movable in one direction along said base, a first slide mounted on said slide member and a dressing tool mounted on said slide, and a second slide on said base for supporting a template, and an elongated member mounted for movement along said slide member and supporting at its one end a template follower for contacting said templet, and means connecting one end of said elongated member and said first slide for causing movement of said first slide transversely of said slide member as said elongated member moves along its path of travel, and a ratio slide mechanism connected between said base and said template slide for controlling movement of said slide member as said template slide is moved transversely of said base, the ratio slide assembly connected between the template slide and the base including an inclined slide guide on said template slide and a yoke mechanism slidably engaging said inclined slide guide, said yoke being rotatably supported on said base.

6. A grinding wheel dressing apparatus including a base, a slide member mounted on and movable in one direction along said base, a first slide mounted on said slide member and a rotatable dressing tool support mounted on said first slide, and a second slide on said base for supporting a template, and a supporting member mounted in said slide member for movement parallel to the movement of said slide member and supporting at one end a template follower for contacting said templet, a mechanism connected between the other end of said supporting member and said first slide for causing movement of said first slide transversely of said slide member as said supporting member is moved along its path of travel, a rotatable member mounted on said first slide adjacent said rotatable dressing tool support and a connection between said rotatable member and said rotatable dressing tool support, and a parallel link mechanism connected between said template follower supporting member and said rotatable member to control the angle of said dressing tool support relative to the grinding wheel being dressed.

7. A grinding wheel dressing apparatus including a base, a slide member mounted on and movable in one direction along said base, a first slide mounted on said slide member, a rotatable dressing tool support mounted on said slide, and a second slide mounted on said base for supporting a template, a supporting member mounted on said slide member for movement along said slide member and rotatably supporting at one end a template follower, a mechanism connecting the other end of said arm and said first slide for causing movement of said first slide transversely of said slide member as said supporting member is moved along its path of travel, means connected to said templet follower for rotating said template follower, a rotatable member mounted on said first slide adjacent said rotatable tool support and a connection between said rotatable member and said rotatable tool support, and a parallel link mechanism connected between said means for rotating said template follower and said rotatable member to control the angle of said dressing tool support relative to the grinding wheel being dressed.

8. A grinding wheel dressing apparatus including a base, a slide guide mounted on said base, a slide member slidably mounted on said slide guide for movement along said base in one direction, a pair of slide guides mounted transversely of said slide member and said one direction, a tool slide mounted on one of said pair of slide guides, a tool support rotatably mounted on one end of said tool slide, and a rotatable member on said tool slide supported adjacent said rotatable tool support, and an arm and link mechanism connecting said rotatable member and said rotatable tool support together for controlling rotation of both said tool support and said rotatable member, a template slide engaging the other of said pair of slide guides, and an extension on said base supporting a pivoted yoke, and an inclined slide guide mounted on the under side of said template slide and slidably engaged by said yoke for determining movement of said template slide and said slide member along said base, a housing mounted on said slide member, an arm slidably supported within said housing and having rotatably mounted on the free end thereof a template follower, means connected to said templet follower for rotating said template follower, an inclined slide guide mounted on the inner end of said arm and a yoke engaging said last inclined slide guide and having a pin engaging said tool slide, and link mechanism connected between the means rotating said template follower and said rotatable member controlling rotatable movement of said tool support.

9. A grinding wheel dressing apparatus including a base, a slide guide mounted on said base, a slide member slidably mounted on said slide guide for movement along said base in one direction, a pair of slide guides mounted transversely of said slide member and said one di rection, a tool slide mounted on one of said pair of slide guides, a tool support mounted on said tool slide, a template slide engaging the other of said pair of slide guides, and an extension on said base supporting a pivoted yoke, and an inclined slide guide mounted on the under side of said template slide and slidably engaged by said yoke for determining movement of said template slide and said slide member along said base, a housing mounted on said slide member, an arm slidably supported within said housing and having mounted on the free end thereof a template follower, an inclined slide guide mounted on the inner end of said arm member and a yoke slidably engaging said last inclined slide guide and having a pin engaging said tool slide.

10. A grinding wheel dressing apparatus including a base, a slide guide mounted on said base, a slide member slidably mounted on said slide guide for movement along said base in one direction, a slide guide mounted transversely of said slide member and said one direction, a tool slide mounted on said slide guide, a tool support mounted on said tool slide, a template slide mounted on said base and having a flat horizontal template support for supporting a template in a horizontal plane, and means connecting said slide member and said template slide, an arm slidably supported on said slide member and having rotatably mounted on one end thereof a template follower for contacting said template, and means connecting the other end of said arm and said tool slide for controlling movement of said tool slide as said template follower and a template on said template slide move relative to each other.

NILS HOGLUND.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,996,396 Atkins Apr. 2, 1935 2,015,120 Mussler Sept. 24, 1935 2,184,684 Bickel Dec. 26, 1939 2,321,789 Atherholt June 15, 1943 2,369,039 Gocht Feb. 6, 1945 2,394,671 Duncan Feb. 12, 1946 2,472,975 Houghtaling June 14, 1949 2,484,874 Brown Oct. 18, 1949 FOREIGN PATENTS Number Country Date 448,001 Great Britain May 29, 1936 668.913 Germany Dec. 13, 1938