US2056149A

US2056149A - Truing apparatus

Info

Publication number: US2056149A
Application number: US47031A
Authority: US
Inventors: Herbert J Griffing
Original assignee: Norton Co
Current assignee: Saint Gobain Abrasives Inc
Priority date: 1935-10-28
Filing date: 1935-10-28
Publication date: 1936-09-29
Anticipated expiration: 1953-09-29

Description

sept. 29, 1936. ||n J GRlFFiNG 2,056,149"

TRUING APPARATUS Filed Oct. 28, 1955 d 3/ Z9 44 i l l L 30 27 /6 i HERBERT J. ER/FF/NG y @1Mo-mui@ Gummi Patented Sept. 29, 1936 UNITED STATES PATENT OFFICE TBUING APPARATUS tion of Massachusetts Application October 28, 1935, Serial No. 47,031

7 Claims.

This invention relates lto grinding machines, and more particularly to a grinding wheel truing apparatus for generating a predetermined form on the operative face of a grinding wheel.

One of the objects of this invention is to provide a simple and thoroughly practicable formed wheel truing apparatus. Another object is to provide an improved grinding wheel forming apparatus which permits producing irregular curved surfaces and shapes upon the operative face of a grinding wheel while maintaining the truing vtool or diamond in a substantially predetermined angular relation with the surface being trued.

A. further object of this invention is to provide a radial truing device which is adapted to produce an irregular form on the operative face of a grinding wheel. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing, in which is shown one of the various possible embodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary cross-sectional view of a grinding machine, showing the wheel truing apparatus in section;

Fig. 2 is a plan view of the radial truing device, with the operating handle removed; and

Fig. 3 is a horizontal sectional view, taken approximately on the line 3-3 of Fig. 1.

A grindingmachine has been illustrated comprising a base I0 and a transversely movable wheel slide II mounted on ways (not shown) on the base. The wheel slide II supports a rotatable wheel spindle I2 which in turn supports a rotatable grinding wheel I3.

The grinding wheel slide II may be moved transversely by any cfthe well-known feeding mechanisms, such as that shown in the prior U. S. patent to Norton No. '162,838 dated June 14,` 1904, to which reference may be had for a detailed disclosure of the feeding mechanism. Such a 4feeding mechanism may comprise a half nut I4 depending from the wheel slide II which engages or meshes with a rotatable feed screw I5 journaled in suitable bearings (not shown). The front end of the feed screw I5 is provided with a gear I6 meshing with a gear I1 on the inner end of a shaft I8. The shaft I8 is rotatably supported in bearings (not shown) in the base III and is provided with a gear I9 on its front end which may be turned by a manually operable feed mechanism, such as that shown in the prior patent to Norton above referred to.

A longitudinally movable work table 25 is slid- 5 ably mounted on the flat way 26 and a V-way 21 and arranged so that it may be moved vlongitudinally relative to the base I 0. The table 25 supportsa swivel table 28 which, as shown in the above-mentioned prior patent, serves as a l0 support for a headstock and footstock (not shown) or a truing apparatus, as illustrated in the drawing.

The table 25 may be moved longitudinally either manually or by means of a power operated l5 traversing mechanism. For the sake of simplicity of illustration, however, a manually operable hand traverse mechanism has been illustrated. The table 25 is provided with a depending rack barI 29 which meshes with a gear 30 mounted on 20 the inner end of a rotatable shaft 3| which is `iournaled in the base III. The outer end of the shaft 3l is provided with a manually operable traverse wheel 32 so that the table may be traversed longitudinally relative to the base I 0 by 25 rotating the hand Wheel 32.

The improved truing apparatus has been illustrated as mounted on the swivel table 28 of a grinding machine, as above described. The truing apparatus comprises a base member 35 which 30 is provided with bearing

surfaces

36 and 31 arranged tomate with corresponding surfaces on the swivel table 28. The truing apparatus base 35 is arranged so that it may be clamped rigidly to the swivel table 28 by means of a clamping 35 member 38 which is pivotally mounted on a stud y 39 and arranged to engage a dovetailed surface 40 on the upper surface of the swivel table 28. The clamping member 38 is actuated by means of a clamping screw 4I so that the truing apparatus 40 base 35 may be rigidly clamped in position on the swivel table 28. p

'I'he truing apparatus comprises a pivotally mounted frame 42 which is preferably arranged to swing about a fixed axis in a circular path. 45

The lower end of the frame 42 is provided with a trunnion 43 supported in a bearing 44 in the frame 35. The upper portion of the--steadyrest base 35 is provided with a circular track 45. The track 45 is preferably formed-as an integral part 50 of a plate 48which is fixed to the steadyres.. base 35 by means of the

screws

41 and 48. The upper end of the frame 42 is provided with a follower plate 49 having a grooved follower surface 50 which is shaped to mate with the track 45. 55

The follower 43 and track 45 serve as a rigid support for the upper end of the truing apparatus 4frame 42 so that it may rigidly support a truing' .tool during its swinging movement in a circular path about the axis of the trunnion 43 as a pivot.

In the preferred construction, the frame 42 is provided with a suitable means for holding the frame in a iixed position so that the truing apparatusmay be utilized for truing a true cylindrical surface on the wheel being trued, if desired. The follower plate or bracket 49 is provided with a notch 52 which may' be engaged by a slidably mounted plunger 53 carried by the track plate- 46 so that the frame 42 may be held in a iixed ually operable handle 55 is mounted on the upper end of the frame 42 so that the frame 42 may be readily swung in a circularA path for truing the grinding wheel.- y

In order that a grinding wheel may be accurately trued to the desired predetermined form, it is essential that the diamond or truing tool be moved across the face of the wheel while the diamond or truing tool bears the same angular relation with-the wheel at the point of cutrelative to the swinging frame as the frame isv swung through a circular path to true a predetermined contour on the periphery of the wheel being trued. As illustrated in the drawing, a diamond or truing tool is mounted in the front end of a transversely movable sleeve 6| which is slidably mounted within a cylindrical bore S2 in an enlarged portion 63 of the frame 42.` The other end of the sleeve 6I is provided with a follower 64 which is arranged to engage and follow the surface of a template or form 65 as the frame 42 is swung in a circular path. A spring 66 is contained within an enlarged bore 61 in the portion B3 of the frame 42 and is interposed between the bottom surface 68 of the bore 61 and a flange 69 mounted on the end of the truing tool sleeve or holder 6|. The compression of the spring 66 serves to maintain the follower 84 in operative engagement with the cam or form 65 as the frame 42 is swung in a circular path, therel by causing the holder 6I and the truing tool 60 to move transversely toward and from ,the wheel axis so as to generate a predetermined shape or contour on the peripheral surface of the wheel.

By providing a template or cam 65 which is provided with a properly shaped surface to generate a predetermined contour on the wheel periphery, any desired shape may be produced. By utilizing a swinging motion of the truing tool while the truing tool is mo'ved transversely relative to said motion, the truing tool is moved disclosure. A form or template 65 is provided having a properly shaped cam surface to cause a predetermined transverse movement of the truing tool as it is swung through a circular path. The form or template B5 is mounted in place on the truing tool base, the feeding mechanism is then actuated to move the grinding wheel I3 transversely into operative contact with the diamond or truing tool 60. The plunger 53 is then withdrawn from the notch 52 andthetruing tool frame 42 is swung through a circular path by means of the handle 55 while the truing tool is moved transversely by form 65 to generate a predetemiined form` on the face of the grinding position on the truing apparatus base 35. A mane.

wheel. By manipulating the feeding mechanism.' the grinding wheel may be advanced to true the surface thereof to the desired extent.

If it is desired -to true a cylindrical surface on the wheel I3, the plunger 53 is moved into engagement with the notch 52 to lock the frame 42 against a swinging movement. The table 25 may then be traversed longitudinallyby means of the manually operable traverse wheel 32 to pass the truing tool 60 across the operative face of the grinding'wheel I3.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of `the above invention and as many changes might be made in the embodiment set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense;

1. A truing apparatus for a grinding machine comprising a truing lapparatus base, means to clamp said base onv a grinding machine, a pivotally mounted frame which is arranged to swing in a circular path, a pivotal bearing support for the lower end of said frame, means to guide the upper end of said frame, a. truing tool, atruing tool holder slidably supported on said frame and movable transversely relative thereto, and means including a cam to slide the holder transversely relative to the frame as the frame is swung about its pivot. to cause the truing tool to produce a predetermined shape on the. grinding wheel periphery.'

2. A truing apparatus for a grinding machine .comprising a truing'apparatus base, means to a sliding surface on said holder, a mating slide surface on said frame, a follower associated with said holder, and means including a cam to move the holder transversely relative to the frame as the frame is swung about its pivot to cause the truing tool to produce a predetermined shape on the grinding wheel periphery.

3. A truing apparatus for a grinding machine comprising a truing apparatus base, means to clamp said base on a grinding machine, a pivotally mounted frame which is arranged'to swing in a circular path, a truing' tool, a transversely movable truing tool holder supported on said frame, mating slideways on said holder and frame, a follower associated with'said holder, and an interchangeable cam vto move the holder transversely in its slideway relative to the frame as the frame is swung about its pivot to cause track and serves to guide and support said frame,

a truing tool, a truing too-l holder supported on said frame and arranged to move transversely relative thereto, and means to move the holder and tool transversely as the frame is moved on said track to traverse the truing tool across the grinding wheel face to generate a predetermined shape thereon.

5. A truing apparatus for a grinding machine comprising a truing apparatus base, means to clamp said base on a grinding machine, a pivotally mounted frame which is arranged toswing in a circular path, a trunnion on the lower end of said frame, a bearing for said trunnion on the base, a circular track on said base, a follower adjacent the upper end of said frame which mates with said track and serves to guide and support the upper portion of said frame, a truing tool, a truing tool holder supported on said frame and arranged to move transversely relative thereto, and means to move the holder and tool transversely as the frame is swung about its pivot to traverse the truing tool across the grinding wheel face to generate a predetermined shape thereon.

6. A truing apparatus for a grinding machine comprising a truing apparatus base, means to clamp said base on the grinding machine table, a pivotally mounted frame which is arranged to swing through a circular pathfa bearing support for the lower end of said frame, means to guidesaid frame as it swings in a circular path, a trus ing tool, a truing tool holder which is arranged to move transversely relative to the frame, mating slideways on said holder and frame, yieldable means tending to move the truing tool away from the grinding wheel, a follower carried by said holder, and a removable form which is engaged by said follower and serves to move the truing tool transversely relative to the frame as the frame is swung about its pivot to produce a predetermined shape on the periphery of the grinding wheel.

7. A truing apparatus for grinding machines comprising a base, means to clamp said base on a grinding machine, a pivotally mounted frame which is arranged to swing in a circular path, a trunnion on the lower end of. said frame, a bearing for said trunnion on the base, a circular track on said base, a follower engaging the upper end of said frame which mates with said track and serves to guide and support the upper portion of said frame, a truing tool, a truing tool holder supported on said frame and arranged to move transversely relative thereto, yieldable means tending to move the truing tool and holder away from the wheel, and a form removably mounted on said frame which is engaged by said follower and serves to move the truing tool and holder transversely as the frame is, swung about its pivot to traverse the truing tool across the grinding wheel face to generate a predetermined shape thereon.

HERBERT J. GRIFFING.