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Publication numberUS2579520 A
Publication typeGrant
Publication dateDec 25, 1951
Filing dateJul 9, 1949
Priority dateJul 9, 1949
Publication numberUS 2579520 A, US 2579520A, US-A-2579520, US2579520 A, US2579520A
InventorsSmith John W
Original AssigneeFafnir Bearing Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Centerless grinder
US 2579520 A
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Description  (OCR text may contain errors)

Dec. 25, 1951 J. W. SMITH CENTERLESS GRINDER 2 SHEETS-SHEET 1 Filed July 9, 1949 fis i Jam mama/l A'ITORNEYS Dec. 25, 1951 J, w, s g 2,579,520

CENTERLESS GRINDER Filed July 9, 1949 2 SHEETS-SHEET 2 INVENTOR John h TSml iiv Patented Dec. 25, 1951 UNITED STATES I PATENT OFFICE CENTERLESS GRINDER Application July 9, 1949, Serial No. 103,816

15 Claims.

1 My invention relates to a centerless grinder and more particularly to a centerless grinder for grinding blanks having profiles which it has heretofore been impossible to centerless grind by what is substantially the through-feed method.

It is the principal object of the invention to provide a method of and apparatus for the generally continuous centerless grinding of profiled articles, such, for example, as barrel rollers and similar articles which it has heretofore been impossible to centerless grind in a generally continuous manner.

Other objects and various features of novelty and invention will be hereinafter pointed out or will become apparent to those skilled in the art.

In the drawings which show, for illustrative purposes only, a preferred form of the invention- Fig. 1 is an end View in elevation of a simple form of centerless grinder, illustrative of the invention;

Fig. 2 is a side view of the regulating wheel and feed mechanism, viewed substantially in the direction of the arrows on line 2--2 of Fig. 1;

Fig. 3 is a fragmentary plan view of grinding and regulating wheels illustrating features of the invention;

Figs. 4, 5 and 6 are enlarged, fragmentary, sectional views of the grinding and regulating wheels showing the work :blank being progressively ground from cylindrical to generally barrel shape;

Fig. 7 is a fragmentary end View, similar to Fig. 1, but illustrating a slight modification;

Fig. 8 is a side view in elevation of the regulating wheel shown in Fig. '7.

The centerless grinder may consist of a grinding wheel 5, a regulating wheel 6, a work sup- In the particular illustration of Figs. 1 to 6, the regulating wheel is arranged to be moved away from the grinding wheel, which latter is carried by the main frame of the machine, as heretofore noted. As illustrated, the regulating wheel 6 is rotatably mounted in the slidable base I n, which base H! is itself adjustably mounted on a sliding sub-base l I, and an adjusting screw 12 connects the bases l0 and I I to provide for adjustment of the regulating wheel relatively to the grinding wheel. The sliding sub-base H may be pivotally attached at l3 to the upper end of a lever l4 pivoted at l5 to ears I6, depending from the main base 9. The lever I4 may be actuated by a cam H, which is rotatably mounted on a shaft [8, which shaft and the shaft [9 of the regulating wheel are driven in unison. The cam l! is of such form that during a small portion of the rotation of the regulating wheel 6, the lever is rocked so as to pull the regulating wheel back away from the grinding wheel 5. The interval during this withdrawing of the regulating wheel from the grinding wheel, in accordance with my improved method, is used for transferring work from one part of the grinding and regulating wheel to another part for successive grinding operations, as will be later described. The regulating wheel is again :moved up toward the grinding wheel by the cam ll; it may be moved up and then dwell or it may be moved very gradually throughout the grinding operation so as to provide a continuous feed.

i Feed may also result from gradually camming port or blade I, and, if desired, a top work support 8. It is common practice in the centerless grinding art to move the grinding wheel or the regulating wheel for separating the two in the infeed method of grinding. Generally speaking, it is immaterial Whether the grinding wheel is moved away from the regulating wheel or the regulating wheel moved away from the grinding wheel, the object being merely to separate the two wheels so that work blanks may be moved without coming in contact with the grinding wheel during the feed movement of the work pieces. I provide means for separating the wheels and in the form illustrated the grinding wheel 5 is rotatably mountedon the base or foundation 9, and the regulating wheel 6 is mounted on the slide I 0 slidable on the base 9.

the holding surfaces on the regulating Wheel.

In accordance'with my invention, the regulating wheel and the grinding wheel have respectively opposed holding and grinding surfaces arranged for the grinding of the profil on the object to be ground. For example, if barrel rollers are to be ground, the grinding wheel has a plurality of grinding surfaces profiled so as to progressively grind the surface of a blank into barrel roller form. The regulating wheel has holding surfaces which may be more or less profiled so as to hold the work blanks while being ground.

As shown particularly in Figs. 3 to 6,

the grinding wheel has a plurality of grinding surfaces 20, 2|, 22, 23, 24. "These grinding surfaces are circumferentially continuous and a e separate and. in generally radial planes; that is to say, the grinding surfaces 20 to 24 are not spiral but extend around the grinding wheel in generally radial planes. The surfaces are profiled so as to eventually grind the barrel roller 211111318, as shown in Fig. 4, the grinding wheel has side grinding surfaces 25 corners 01f of a cylindrical roller blank. The holding surface on the regulating wheel, which is opposite the grinding surface 2t, may be a plane surface 26, as shown particularly in Fig. 4. The next grinding surface 2! may be sub stantially as shown in Fig. 5, and if desired the corresponding holding surface 2? on the regulating wheel may be contoured as shown in Fig. 5. The contouring may be progressive until the final form is reached, as in Fig. 6, when the grinding surface 2 5 will be profiled to the desired barrel shape, and the corresponding holding surface 28 on the regulating wheel may be similarly contoured so that the blank will be accurately held and accurately profiled to barrel roller shape.

An important part of my invention is the means or method of transferring work blanks from one grinding surface or throat to the next. It has been stated that the grinding surfaces are not spiral; neither are the holding surfaces .on the regulating wheel spiral, but both the holding surfaces and the grinding surfaces are in what may be termed generally radial planes. In the form illustrated, the work pieces or blanks are transferred from one grinding surface and corresponding holding surface to the next grinding and corresponding holding surface, by means on the regulating wheel which engage the blanks and shift the same from one grinding surface to the next, whereby at each revolution of the regulating wheel a finished piece is discharged from the last grinding throat, and by means to be explained, a new work blank is inserted into the first grinding throat. The transfer of work pieces from one grinding throat to the next is always done while the work pieces are out of engagement with the grinding wheel.

blanks well out of the way of the grinding surfaces on the grinding wheel. The work supports 6 ands may be carried either by the regulating wheel base or by the grinding wheel base, but, in any event, the work pieces or blanks will either roll away from the grinding wheel, as in Fig. 1', or will be carried bodily by the regulating wheel and the work support if the latter is carried with the regulating wheel base.

In the form shown in Figs. 7 and regulating wheel at the transfer zone is of re duced diameter, as indicated at 29, so that the work pieces will simply roll down on the inclined work support '5 and into engagement with the surfaces 29 and thus be removed from the zone of the grinding surfaces of the grinding wheel 5: shown in Fig, '7.

One form of my improved transfer mechanism consists of cam means which may be the form of cam shoulders or ribs extending fromone holding surface to the next adjacent holding surface so that when the regulating wheel is rotated, the work blanks supported on the work support will be engaged by the inclined cam shoulder means 39 and thus shifted from onegrinding throat to the next successive the 25 to grind the grinding throat until the last throat is reached, at which time a finished piece will be ejected by the last transfer shoulder (ill.

Work blanks are preferably automatically fed to the first grinding throat, and since such magazine feeds are well known in the art for feeding work pieces to grinding throats for infeed grinding of pieces, such mechanism is indicated only diagrammatically in Fig. 2. in that ure, work blanks are fed down a chute 31 onto a support which may be the plunger 32. Work blanks may ordinarily be stopped by an abutment 33. When the plunger 32 is drawn rearwardly or to the right, a work blank drops down andupon the next movement of the plunger 32 to the left, the dropped work blank will be pushed to the left and into the first grinding throat, as will be understood. The feeding of blanks, as stated, is well understood in the art and has been only diagrammatically shown, but it will be understood that the actuation of the plunger '2 will be in timed relation with the rotation of the regulating wheel so that a work blank is forced into the first grinding throat at the proper time.

The grinding wheel and the regulating wheel may have the grinding surfaces and the holding surfaces formed in various fashions and separated as desired. In the form shown in the drawings, the grinding surfaces 23 to 2d are formed in grooves which are bordered or defined by circumferentially extending ribs or flanges. Thus, the camming shoulders or ribs 39' of the regulating wheel in efiect form continuations of the shoulders defining the grooves of the regulating wheel. The ribs 36 may be somewhat narrower than the ribs defining the holding surfaces so as to provide the necessary clearance for the blanks. For ease of manufacture, the section 35 of the regulating wheel, which has the spiral or angular transfer" means. such as ribs 3E3, may be made as a separate .part' set into: and forming a part of the regulating wheel.

In order to accurately hold .the work, blanks and insure a proper holding thereof while being profiled, I prefer to form the work-support "l more or less as shown in Fig. 2, that to say, so that the various supporting surfaces corresponding to the various grinding throats will be of a form corresponding to the general contour of the piece being ground in that throat.

The general operation of the machine will be understood by those skilled in the art. The grinding wheel is driven at the proper grinding speed, as is usual in centerless grinding, and the regulating wheel is driven at the proper regulating wheel speed. The wheels are separated, or, rather, the work pieces are separated from the grinding wheel once during each revolution of the regulating wheel, and at that time the blanks are advanced one step; a finished work piece is ejected from the last grinding throat and a new work blank is fed into the first grinding throat. When the work pieces are again brought up to the profiled grinding surfaces of the grinding wheel, the work blanks are ground and the ground work pieces are again removed from the grinding wheel and are fed along one stepso that eventually the fed-in blank comes out of the last throat as a finished ground piece. 7

The profiles of the various grinding surfaces may be maintained by any desired or standard profiling devices now well known in the art.

While the invention has been described in considerable detail and preferred forms illustrated,

it is to be understood that various changes may be made within the scope of the invention as defined in the appended claims.

Iclaim:

1. In a centerless grinder, a grinding wheel and a regulating wheel, said grinding wheel having a plurality of separate circumferentially continuous grinding profiles in adjacent parallel radial planes, said regulating wheel having separate corresponding profile surfaces in adjacent parallel radial planes and continuous throughout a portion only of the circumference of said regulating wheel, said regulating wheel having generally spiral transfer means thereon for transferring work blanks from one profile to the next.

2. A centerless grinder comprising a grinding wheel and a regulating wheel, said grinding wheel having a plurality of circumferentially continuous grooves therein in adjacent parallel radial planes, sa'idgrooves being profiled to grind a desired shape on a work blank, said regulating wheel having a plurality of grooves cooperating with said grooves of said grinding Wheel to embrace work blanks between them and in the grooves, said grooves in said regulating wheel being continuous throughout a portion only of the circumference of the regulating wheel, said regulating wheel having transfer shoulders for transferring work pieces from one groove therein to the next.

3. In a centerless grinder, a regulating wheel and a grinding wheel, said grinding wheel having a plurality of circumferentially extending grooves in spaced apart parallel radial planes, said regulating wheel having a corresponding plurality of grooves in spaced apart parallel radial planes, a work rest for supporting work blanks held between the grooves of the grinding wheel and regulating wheel, said regulating wheel having angularly extending transfer means for transferring .work blanks from one groove to the next upon rotation of the regulating wheel.

4. In a centerless grinder, a grinding wheel and a regulating wheel, a work rest between the wheels for supporting work blanks, said grinding and regulating wheels having opposed circumferentially extending work holding surfaces in spaced apart parallel radial planes, means for separating said wheels to remove a work piece from the grinding surface of said grinding wheel, said regulating 'wheel having angularly extending transfer means for transferring work pieces from one groove in said regulating wheel to the next groove therein, whereby upon rotation of said regulating wheel work pieces resting on said work rest may be transferred from one groove in said regulating wheel to the next groove therein, for the purpose set forth.

5. In a centerless grinder, a grinding wheel, a regulating wheel, said grinding wheel having a plurality of circumferentially continuous profiled grinding surfaces, each surface being separate from the other and located between generally radial planes, said regulating wheel having a plurality of separate holding surfaces for holding work pieces against the profiled grinding surfaces of said grinding wheel, a work support for supporting work pieces while being ground as aforesaid, and means for transferring work pieces from one profiled grinding surface to the next profiled grinding surface, said re ulating wheel having angularly extending shoulder means constituting the transfer mechanism, said regulating wheel having surfaces adjacent said shoulder means of relatively smaller diameter than the holding surfaces of said regulating wheel, whereby work pieces may fall away from said grinding wheel while being transferred from one profiled surface across the face of the grinding wheel to the next profiled grinding surface.

6. In a centerless grinder, a grinding wheel and a regulating wheel, said grinding wheel having a plurality of profiled grinding surfaces in adjacent parallel radial planes, said regulating wheel having holding surfaces in corresponding adjacent parallel radial planes, said holding surfaces being continuous throughout a portion only of the circumference of said regulating wheel, and generally spiral transfer means on said regulating wheel for transferring blanks from one holding surface to the next adjacent holding surface, and a work support for supporting work blanks between said grinding and regulating wheels.

'7. In the combination defined in claim 6, means for separating said grinding and regulating wheels while the work blanks are transferred from the radial plane of one profiled grinding surface to the plane of another profiled grinding surface.

8. In the combination defined in claim l6, said regulating wheel at the region of said transfer means being of reduced diameter, whereby work blanks being transferred as aforesaid may fall away from the grinding surfaces While being transferred. 7

9. In a centerless grinder, a grinding wheel, a regulating wheel, and a work support for supporting blanks between said wheels, said grinding wheel having a plurality of circumferentially continuous profiled grinding surfaces in parallel adjacent radial planes, said regulating wheel having holding surfaces for holding work blanks on said grinding surfaces for grinding profiles thereon, said regulating wheel having angularly extending transfer camming surfaces for transferring work blanks from opposite one profiled grinding surface to another profiled grinding surface.

10. In the combination defined in claim 9, means for separating said grinding and regulating wheels while work blanks are transferred from the radial plane of one profiled grinding surface to the radial plane of another profiled grinding surface.

11. In the combination defined in claim 9, said regulating wheel in the region of said transfer means being of reduced diameter, whereby work blanks supported by said work support may fall away from said grinding surfaces and into engagement with said reduced diameter surfaces, whereby said work blanks may be transferred from the plane of one grinding surface to the plane of another grinding surface while being out of contact with the grinding surfaces.

12. In a centerless grinder, a grinding wheel and a regulating wheel, said grinding wheel having a plurality of profiled grinding surfaces in adjacent parallel radial planes, said regulating wheel having holding surfaces for holding work while being ground by said profiled grinding surfaces, a work support for supporting work blanks while being ground as aforesaid, said regulating wheel having transfer means for transferring work pieces from one profiled grinding surface to the next profiled grinding surface upon rotation of said regulating wheel, and means for feeding work pieces to the grinding throat between the regulating wheel, the grinding wheel, and the work support.

13. In a centerless grinder for the centerless grinding Lo'f' generally'barrel-shaped rollers, a grinding wheel, a regulating wheel and work support between said wheels, said grinding wheel having a plurality of circumferentially continuous profiled grinding surfaces in adjacent parallel radial planes, each of said surfaces being profiled to contribute to the grinding of a generally barrel-shaped roller, said regulating Wheel having holding surfaces in generally radial planes extending throughout a portion only of the circumference of the regulating wheel for holding work blanks against said profiled grinding surfaces, said regulating wheel having angularly extending transfer cam surfaces for engaging .blanksto transfer the same to successivbe grindingsurfaces as aforesaid, and means for separating the work'blanks from the grinding surfaces while the blanks are being transferred as afore- .said.

14. Ina: centerless grinder, a regulating Wheel :havinga plurality of holding surfaces for holding a plurality of work blanks against a grinding 'wheel, saidholding surfaces extending throughout a portion only of the circumferential extent of .said regulating wheel, and angularly extending shoulder means adjacent said surfaces for camming work pieces from one holdingsurface to. another holding surface upon rotation of said regulating wheel.

Number JOHN W. SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name I Date 1,665,084 Caster Apr. 3,1928 1,846,661 Vuilleumier Feb. 23, 1,932 1,886,579 Pew Nov. 8, 1932 1,948,113 Isler Feb. 20, 1934 1,973,922 Dumas Sept. 18; 1934 2,010,730 Lloyd Aug. 6, 1935 2,413,880 Mason Jan. 7, 1947 2,436,252

Duncan Feb. 17, 1948

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1665084 *Jul 27, 1927Apr 3, 1928Cincinnati Grinders IncGrinding machinery
US1846661 *Apr 4, 1929Feb 23, 1932New Departure Mfg CoMethod of feeding articles to grinding machines
US1886579 *Aug 12, 1930Nov 8, 1932Hoover Steel Ball CompanyGrinding machine
US1948113 *Mar 22, 1928Feb 20, 1934Cincinnati Grinders IncCenterless work feed
US1973922 *Dec 12, 1933Sep 18, 1934Dumas Eugene DBall grinding disk
US2010730 *Jan 30, 1935Aug 6, 1935Lloyd Arthur HaroldCenterless grinding machine
US2413880 *May 22, 1943Jan 7, 1947Mason Arthur CMachine for forming spherical bodies
US2436252 *Jan 18, 1946Feb 17, 1948Lane DuncanGrinding apparatus and process
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2950580 *Apr 21, 1958Aug 30, 1960Cincinnati Milling Machine CoCenterless grinding machine for tapered work pieces
US4194323 *Nov 30, 1978Mar 25, 1980Combustion Engineering, Inc.Centerless grinder
EP0121213A2 *Mar 27, 1984Oct 10, 1984Maschinenbau Grieshaber GmbH & Co.Device with a machining tool for machining rollers
Classifications
U.S. Classification451/242
International ClassificationB24B5/00, B24B5/26
Cooperative ClassificationB24B5/26
European ClassificationB24B5/26