US2178848A

US2178848A - Form grinding machine

Info

Publication number: US2178848A
Application number: US154031A
Authority: US
Inventors: Booth Clement
Original assignee: Cincinnati Grinders Inc
Current assignee: Cincinnati Grinders Inc
Priority date: 1937-07-16
Filing date: 1937-07-16
Publication date: 1939-11-07
Anticipated expiration: 1956-11-07

Description

Nov. 7, 1939. c, BOOTH 2.178.848-

FORM GRINDING MACHINE Filed July 16, 1937 2 Sheets-Sheet l FIG. 1

INVENTOR. CLEMENT 500 TH BY WZQWM.

ATTORNEY.

Patented Nov. 7, 1939 PATENT FORM GRINDING MACHINE Clement Booth, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a corporation of Ohio Application July 16, 1937, Serial No. 154,031

9 Claims.

This invention relates to grinding machines and more particularly to improvements in a form grinding machine.

The chief object of this invention is to provide an improved simplified and inexpensive structure for performing form grinding operations.

Other objects and advantagesof the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawings forming a part thereof and it is to be understood that any modifications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to the drawings in which like reference numerals indicate like or similar parts:

Figure 1 is an elevation of a grinding machine embodying the principles of this invention.

Figure 2 is a plan View of the work table.

Figure 3 is a section on the line 3'3 of Figure 2.

Figure 4 is a detail View of the control cam as viewed on the line 4-4 of Figure 3.

Referring to Figure l of the drawings, the reference numeral til indicates the bed of a grinding machine upon the top of which is formed a V-guideway l l and a flat guideway !2, as more particularly shown in Figure 3. A table l3 has correspondingly formed parts M and 15 for cooperation with these guideways whereby the table is supported for longitudinal movement and held against lateral movement.

The machine is provided with a grinding wheel it which is movable by conventional mechanism not shown, but terminating in the hand wheel ll, toward and from the work table for engagement or disengagement with the work, and while engaging with the work the table is reciprocated by conventional mechanism such as the power driven pinion i'l interrneshing with the rack l8 fixed to the underside of the table.

The table 53 has a plain top in which is formed a pair of longitudinally extending T-slots it; A mechanism is detachably mounted on the top of this table for supporting a work piece for lateral movement in a substantially radial direction with respect to the grinding wheel, whereby form grinding operations may be easily and accurately performed. This mechanism comprises a base plate i9 which is secured to the table at a number of points by .T-bolts 2t mounted in the T- slots is and passing through suitably drilled holes in the plate. The plate has a pair of bearings 2! formed at opposite ends thereof by means of which a carrier 22 may be trunnioned for oscillating the work toward and from the grinding wheel. The carrier 22 has journal portions 23 projecting from opposite ends thereof by which the carrier is supported in the bearings 2i.

From Figure 3 it will be noted that the center line 24 of these bearings lies in a vertical plane 25 which passes through the center of the V- guideway I4.

The carrier has inclined

guideways

26 and 21 for supporting a headstock 28 and a tailstock 29 for adjustment toward and from one another in accordance with usual practice. The headstock carries a motor 33 which is connected by a power transmitting band 3| for rotation of the headstock spindle 32 which carries a face plate 33 and the usual live center 34. The tailstock carries a spindle 35 which is longitudinally movable by a lever 36 and is adapted to be locked in position by a lever 31. The spindle carries a dead center 38 which is engageable with one end of the work piece. It will now be seen that the headstock and tailstock and the power means for rotating the Work are all carried by the carrier.

The carrier is continuously urged in a clockwise direction about the center of the trunnions by means of springs 39 contained in housings ii! integral with the carrier and acting on headed plungers 4| which bear on bosses 32 formed integral with the base plate W. This clockwise movement is controlled, however, by a cam which controls the form or shape of the work piece. The cam plate 43 is secured to a bracket Ml by means of bolts 45, the bracket in turn being integral with the bed ill. The cam i3 is, of course, removable so that other cams of varying contours may be substituted therefor. The cam is solaid out that the mean diameter line it will lie in a horizontal plane ll, passing through the center line 24 of the bearings 25 and perpendicular to the plane 25. This equalizes the movement of the center line of the work to each side of the vertical plane 25 so that the work moves substantially in a radial plane with respect to the axis of the grinding wheel. It also insures keeping the weight of the work as near as possible in a vertical plane passing. through the axes of the trunnions and thereby prevents the dead weight of the work from coming on the springs 39 or on the control cam 43.

The carrier is providedwith a follower 28 which is attached thereto as by a clamping bolt Ali) and this follower has a very narrow edge which rides on the surface of the control cam as more particularly shown in Figure 4. This shape is desirable in order to prevent interference when the shape of the cam becomes complicated. Attention is also invented to the fact that the periphery of the grinding wheel l6 has a rounded contour so as to: prevent interference and insure accurate reproduction of the desired shape or form to be imparted to the work.

To assist in replacing the cams there is provided a stop member 52 which is threaded in the base plate I!) and passes through an opening 53 in the carrier. A nut 54 is threaded on this stop member in engagement with a dish-shaped washer 55 which engages the carrier whereby upon rotation of the nut 54 in one direction the carrier may be moved in a counterclockwise direction, compressing the spring 39 and relieving the load on the cam, whereby the same may be removed for replacement purposes.

There has thus been provided a form grinding machine having improved simplified and compact mechanism for supporting a work piece for lateral movement during rotation thereof with respect to a grinding wheel whereby predetermined contours may be imparted thereto.

I claim:

1. A grinding machine having a bed, a grinding wheel rotatably supported thereon, a V-guideway formed longitudinally of the bed, a slide reciprocably mounted on the bed and having a V-shaped portion cooperating with said guideway, an oscillatable carrier mounted on said slide, trunnions for supporting said carrier and located in a vertical plane passing through the center of said V- guideway, a headstock and tailstock mounted on said carrier and having work supporting centers located in said vertical plane, and means operable by relative reciprocation of the slide and bed for oscillating said carrier and thereby said centers to opposite sides of said vertical plane for moving a work piece toward and from the grinding wheel to determine the longitudinal profile of the work piece during rotation and translation thereof.

2. A grinding machine having a grinding wheel and a reciprocable slide movable transversely thereof, the combination of means for supporting a work piece for oscillatory movement relative to the grinding wheel including a swinging carrier, trunnions for supporting the carrier on the slide, means normally urging the carrier in one direction about said trunnions, a headstock and tailstock having centers for supporting a work piece on the carrier with the axis of the mean diameter of the work lying in a vertical plane passing through the axes of said trunnions, and interengaging means on the machine and on the carrier activated by transverse movement of the slide to control oscillation of the work to one side or the other of said vertical plane to increase or decrease the diameter of the work while the same is being translated by said slide.

3. A grinding machine having a grinding wheel and a reciprocable slide movable transversely thereof, the combination of a carrier mounted for oscillation on said slide, means self-contained in the carrier for supporting and power rotating a work piece, the axis of oscillation of the carrier and the axis of the supporting means for the work extending parallel to each other in a conmon vertical plane, resiliently operable means for moving the carrier and thereby the work about the axis of the carrier toward the grinding wheel, a cam mounted on the bed, and a follower integral with the carrier and. riding along said cam during transverse movement of the slide for controlling oscillation of the carrier and thereby the movement of the work toward and from the grinding wheel.

4. A grinding machine having a grinding wheel and a reciprocable slide movable transversely thereof, the combination of a carrier rotatably mounted on the slide for movement about an axis extending parallel to the direction of movement of the slide, means self-contained in the carrier for supporting and power rotating a work piece, the axis of rotation of the carrier and of the work supporting means lying in a common vertical plane, resiliently operable means located on one side of said plane for urging the carrier in one direction about its axis of rotation, cam means located on the other side of said plane for positively controlling movement of the carrier and thereby of the work toward and from the grinding wheel, and additional means located on one side of said plane for positively limiting the rotative movement of the carrier caused by said resiliently operable means.

5. An attachment for a grinding machine of the type including a bed having a work supporting table and a grinding wheel mounted thereon for relative traversing movement, said attachment including a base adapted to be secured to the table, an auxiliary work support pivoted to the base for oscillation about an axis extending parallel with that of the grinding wheel, means on the work support for rotatably supporting a work piece for rotation about an axis parallel with said pivot, means for resiliently urging said work supporting means about its pivotal support, and control means including a first element fixed with respect to the attachment and a second element fixed with respect to the grinding wheel, one of said elements being contoured in accordance with the profile to be reproduced on the work piece whereby said control means variably determines the relative position of the axes of the work and grinding wheel during relative traverse of said parts and thus the profile produced by the grinding wheel on the work during such traverse.

6. An attachment for a grinding machine of the type including a bed having a work supporting table and a grinding wheel mounted thereon for relative traversing movement, said attach ment including a base adapted to be secured to the table, an auxiliary work support pivoted to the base for oscillation about an axis extending parallel with that of the grinding wheel, means on the work support for rotatably supporting a work piece for rotation about an axis parallel with said pivot, means for resiliently urging said work supporting means about its pivotal support, control means including a first element fixed with respect to the attachment and a second element fixed with respect to the grinding wheel, one of said elements being contoured in accordance with the profile to be reproduced on the work piece whereby said control means variably determines the relative position of the axes of the work and grinding wheel during relative traverse of said parts and thus the profile produced by the grinding wheel on the work during such traverse, and means for adjustably limiting thev movement of the work holding means opposing and limiting the resilient actuation thereof.

'7 A machine for producing variable profiles on a cylindrical work piece, said machine including a bed or support, a grinding wheel mounted thereon for rotation about a predetermined axis,

in opposition to the grinding wheel, means for effecting relative traversing movement of said parts in a direction parallel with the aXis of said grinding wheel, a work supporting member mounted on the table, said supporting member having work engaging members adapted rotatably to support a work piece with its axis of rotation parallel with that of the grinding wheel, means pivotally connecting the work support and table for oscillation about an axis parallel with that established by the work supporting members whereby the work may be moved in a direction toward and from the grinding wheel, said grinding wheel having a peripherally crowned face to conform with the varying contours to be produced on the work piece, and means including relatively traversable pattern and follower members one of which is fixed with respect to the grinding wheel and the other with respect to the work support, whereby said members traverse each other on relative movement of said parts in an axial direction to determine the movement of the work supporting member about its pivotal mounting and thus the relative approach and retraction of the axes of the work and grinding wheel.

8. An attachment for the performance of cambering or like operations on a grinding machine of the type embodying a support, a grinding wheel and means for eifecting relative translation of said parts, said attachment including a base plate adapted to be secured on a separate element of the grinding machine and having spaced aligned bearing portions, an oscillatable work supporting member having trunnion portions interengaged with the bearings whereby the work supporting member is mounted on the plate for oscillation with respect thereto about an axis determined by said spaced bearings, a spring housing mounted on the work supporting member, a stud carried by the plate having an enlarged terminal portion slidable in the housing and engageable with the housing for limiting relative movement of the work support and plate in one direction, a spring within the housing having one end thereof engaging the enlarged terminal portion of the stud, and an abutment member carried by the housing and engaging the opposite end of the spring whereby the latter reacts through the stud on the plate to effect a unidirectional urge of the work support about its trunnion mounting, an additional stud member interengaged with the work support and the plate, and an adjustable abutment device carried by said stud and engaging the work support for variably determining the extent of movement thereof effectible by the spring. I

9. An attachment for the performance of cambering or like operations on a grinding machine of the type embodying a support, a grinding wheel and means for effecting relative translation of said parts, said attachment including a base plate adapted to be secured on a separate element of the grinding machine and having spaced" aligned bearing portions, an oscillatable work supporting member having trunnion portions interengaged with the bearings whereby the work supporting member is mounted on the plate for oscillation with re pect thereto about an axis determined by said spaced bearings, a springhousing mounted on the work supporting member, a stud carried by the plate having an enlarged terminal portion slidable in the housing'and engageable With the housing for limiting relative movement of the work support and plate in one direction, a spring within the housing having one end thereof engaging the enlarged terminal portion of the stud, and an abutment member carried by the housing and engaging the opposite end of the spring whereby the latter reacts through the stud on the plate to effect a unidirectional urge of the work support about its trunnion mounting, an additional stud member interengaged with the work support and the plate, an adjustable abutment device carried by said stud and en'- ga-ging the work support for variably determining the extent of movement thereof eifectible by the spring, a cam member and a follower for variably shifting the work support about its trunnion within the limits determined by the adjustable abutment on the last-mentioned stud, one of said parts being adapted to be secured to the grinding machine and the trunnioned work support having a bracket portion positioned to support the other of said parts in cooperative relation with the part on the grinding machine, substantially as and for the purpose described.

CLEMENT BOOTH.