US2426925A - Ball honing device - Google Patents

Description

Sept. 2, 1947. R, Ems 2,426,925

BALL HONING DEVICE Filed Dec. 10, 1942 .2 v Z 22' I INVENTOR BY Fo Zo Z /ZZ s.

' ATTORNEYS,

Patented Sept. 2, 1947 BALL HONING DEVICE Rollo G. Ellis, Royal Oak, Mich, assignor to Micromatic Hone Corporation, Detroit, Mich., a corporation of Michigan.

Application December 10, 1942, Serial No. 468,493

This invention relates to methods and devices for honing spherical surfaces, and particularly to a method and device for honing the outer surface of a sphere to accurate form and dimension.

The main objects of this invention are: to yrate a workpiece having a spherical surface within a honing tool; to support the workpiece on the end of an arbor and rotate the workpiece as its axis is revolved on the surface of a cone having its apex in the center of the tool; to drive a shaft having a crank arm which supports an arbor at an angle to the shaft as the arbor is rotated by a pinion secured thereto which is in mesh relation with a stationary bevel gear disposed coaxially of the shaft; to provide a honing tool with abrasive stones which are movable toward and away from each other with adjusting means for so moving the stones and with, means for adjusting the tool about its vertical axis; to provide a method of honing a spherical surface which embodies the engagement of the surface with stones of a honing tool which are disposed parallel to the base of a cone described by the work supporting arbor as it is rotated and revolved by a suitable driving mechanism; and, in general, to provide a method and device for honing spherical surfaces which is simple in construction, positive in operation, and economical of manufacture.

Other objects and features of novelty of this invention will be specifically pointed out or will become apparent when referring, for a better understanding of this invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figure 1 is a plan view of a honing device embodying features of this invention;

Fig. 2 is a broken view of the honing device illustrated in Fig. l, with the honing tool disposed in position to be movable over a workpiece;

Fig. 3 is an enlarged sectional view of the structure illustrated in Fig. 1, taken on the line 3-3 thereof; and

Fig. 4 is an enlarged sectional view of the structure illustrated in Fig. 3, taken on the line 44 thereof.

Referring to the figures, the base ID of the machine supports a pair of slideways I I upon which a slide I2 is movable toward and from a workpiece .|3. The workpiece is herein illustrated as being a hollow truncated spherical element having a pair of flanges I4 on opposite sides of the spherical surface I5 which is to be honed. Upon the slide I2, a body iii of the honing tool is secured by the elements I! and I8, which have ar- 1 Claim. (01. 51-161 cuateshaped flanges I9 which extend over the projecting feet 2| and 22 of the body portion. A centrally-disposed stud 22, on the bottom of the body portion I6, projects into an aperture 23 in the slide I2 and forms a pivot about which the body portion I6 may be swung fromthe position illustrated in Fig. 2.to.that illustrated in Fig. 1. A pair of spaced shoes 24 are supported in'the body portion, to which abrasive stones 25 having segmental spherical faces 26 are secured. The rearedges of theshoes 24 are provided with sloping surfaces 21, which are engaged by sloping surfaces 28 on the arms29 of the yoke 3 I. The yoke is supported on a threaded'stud 32 upon a yoke element 33, through which the stud extends and relative to which itis adjusted by a handwheel 34, which is screwedonto the stud 32. A spring 35 is disposed betw'eentheyoke- 3| and yoke element 33 for biasing the yoke 3| downwardly When the handwheel 34 is backed off on the thread 32, out of engagement with the yoke element 33.

Apertures 36 and 31 are provided in the slide |2 through which a pin 38 projects for positioning the honing tool in one or the other of its positions, as illustrated in Figs. 1 and 2. Springs 39 engage the shoes 24 and urge them toward the arms 29 for retracting the stones when the yoke 3| is drawn upwardly after a honing operation.

The workpiece I3 is supported on an arbor 4| when secured by the jaws 42 which are movable inwardly and outwardly by a thumb screw 43 on the end of the rod 44 which extends through the arbor. The arbor is supported by a bearing 45 mounted in an angularly disposed boss 46 on a crank 41 on the end of a shaft 48. The shaft is supported by a bearing 49, which projects from an element 5| which is secured to the base ID by a plurality of bolts 52. The shaft 48 extends through the central aperture of a bevel gear 53 which is secured against rotation by the bearing 49. A beveled pinion '54 is secured to the arbor 4| in meshed relation with the bevel gear 53.

The shaft is rotated by a motor 55, operating through a gear reduction unit 56 which rotates the shaft 48 and therefore the crank 41 to revolve the arbor 4| on the surface of a cone, the apex of which is on the center of the sphere defined by the faces 26 of the stones 25. As the arbor is revolved on the surface of a cone, it is rotated as the pinion 54 revolves about the gear 53 to gyrate the workpiece between the abrasive stones 25 to perform the honing operation.

After the workpiece is clamped by the jaws 42 to the end of the arbor 4|, the honing tool is moved toward and over the workpiece when positioned normal to the arbor, as illustrated in Fig. 2. Thereafter, the honing tool is revolved about the stud 22 to the position illustrated in Fig. 1, where it is secured by the pin 38 when inserted into the aperture 36, This positions the abrasive stones at opposite ends of the spherical surface l in a plane normal to the base of the conical surface traced by the arborwvhen revolved. v.llll'iblenjthe crank arm 4'! has been revolved through 180 degrees to the opposite side of the gear 53, the relative position of the stones will have changed so that they will be at the opposite endspfxthe workpiece.

By backing ofi the handwheel iikthe spring;35

exerts a downward pressure onthe wedge-shapedarms 29 which applies a predetermined inward pressure to the abrasive stone-$225 ,WhiQhsQDEfiR the spherical surface of the workpiece. After the honing operation, the handwheel 34 is screwed down upon the yoke element 33 to withdraw the yoke 6| and: arms' "29-=to permit theesprings -89 to move theishoesrfl and stones zseawaycfrom each. other out of engagement with- ;the surface. Thereafter the body :portion 'lt is shiftedxabout the stud 22 to l thesposition illustrated in' -Eig.' 2

normal to the-harbor so thaeitmay. be moved away from .the workplace The workpiece .may then be removed from the arbor --and another workpiece secured-thereto.

By rotating-and gyrating theworkpiece within the honing tool, a more-rugged: tool may be: employed in which -large :stonesaare utilized. The larger stones increase the stone ii-fe produce more rapid abrasion and -accurate r form 1 tothe spherical surface. The rotation of the workpiece in its revolution on thesurface of the cone presents all -the points of the surface to each of the stones, so that the surface will be abraded and ing a workpiece, means for driving said arbor in ---rotation, means for causing said arbor to revolve on-,-.the;surface of a cone as it is driven, with the apex of the cone disposed on the center of the tool,-=rneans for-adjusting the stones toward and ayvay"from the workpiece, and means for adjusting saidtool angularly 0n the slide to have it disposed normalztothe movement of the slide so as to move over said workpiece and to be moved angularly thereafter into a position normal to the axis of the cone on the surface of which the arbor revolves;

ROLLO G. :ELLIS.

.B'EFERENCES CITED The following referenees are of record in the file of this "patent:

*UNITED STATES PATENTS Number Name Date '1,"635,469 'Ericsson July 12, 1927 139501785 'Capps Mar. 13, 1934 2,258,571 Indge V Oct. '7, 1941 1;81=1,21-9 Vetter a June 23, 1931 2,139,896 Johnson Dem-13, 1988 FOREIGN PATENTS Number Country Date 328,849 Great Britain May 8, Y 1-930

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