US1605161A - Device for lapping cylinders - Google Patents

Description

Nov. 2 1926. 1,605,161

B. H. BLOOD DEVICE FOR LAPPING CYLINDERS Original Filed p 26. 1921 llllll HIIH Patented Nov. 2, I926,

UNITED, TA ES Y 1,605,161 PATENT OFFICE.

BRYANT H. BLOOD, onnnn'rroan, connncrlcor, assIeNo'n To PRATT a WHITNEY comrnnv, on NEW zvonx, 1v. Y.,-'A coaroaa'rron or new masnr.

nnvxcn ron Lannie CYLINDERS.

Original application filed The invention relates to an improved apparatus for lapping cylindrical surfaces.

027, filed February 23, 1921, and a division 1 of my copending application Serial No. 503,163, filed September 26, 1921.

An object of the present invention is to provide means to mount the articles being lapped in a holding member, or spider, disposed in a symmetrical group, and in such a manner ,that they may be rotated about their individual axes without parts of the holding member coming into contact with their cylindrical or end faces.

Another object of the invention is to provide means to rotatably mount the cylinders being lapped in the holding member so that their axes are non-radial of the holding member but. disposed so that they are tangent to a circle concentric to the axis of the holding member.

Another object of the invention is to provide a number of short. arbors upon which the cylinders-to be lapped may be individually mounted so that they may rotate freely thereupon, eacharbor being held nonrotatably in the holding member but free to. adjust itself toward or from one of the laps and adapted to be placed with either end pointing outward of the holding member.

A further object of the invention comprises a construction permitting rotation of the holdingniember between the two opposed laps about its own center and also bodily in a circle concentric with the rotating lap. Preferably, both movements of the holding member are induced by the rotary movement of one of the laps and by means constraining the holding member to a definite planetary or orbital path.

With these and other objects in view, my invention consists in the features of construction and operation set forth in the following specification and illustrated. 1n the accompanying drawing.

In the accompanying drawing annexed hereto and forming a part of this specification, I have shown my invention embodied in and-adapted tobetcarried out in a gage lapping machine but it will understood specification being relied upon for September 26, 1921, Serial No. 503,168. Divided and this'application filed June 25,. 1928, Serial No. 647,568. Renewed June 4, 1926.

that the invention can. be otherwise embodied and that the drawing is not to be construed as defining or limiting the scope of the invention, the claims appended to this pose.

In the drawing:

. Figure 1 is a sectional view in elevation of the parts forming the present invention,

t2he section being taken on line 1-*1 of Fig. Fig. 2is a plan view of the apparatus with the upper or rotatable lap removed.

Fig. 3is a detail sectional view of one of the articles being lapped mounted on its individual arbor. 1

Fig. 4 is an end view of the same.

In the above mentioned drawing, I have shown but one embodiment of a machine for-min my invention which is now deemed prefera le but it is to be understood that changes and. modifications may be made within the "scope ofthe appended claims without departing from the spirit of the invention.

' Briefly, themachine forming my invention, in its broadest aspect comprises the following principal parts: first, a lower or stationary lap, the upper surface of which is carefully surfaced to a perfect plane and charged with a suitable abradant material; second, a rotatable lap mounted above the stationary lap and adapted to adjust itself as to parallelism relative to the lower lap, the lower surface of this upper lap being also carefully surfaced and charged with suitable abradant material; third, a holding member disposed between the laps wherein a plurality of arti cles to be lapped may be mounted and retained in a regular or systematic series; fourth, a crank rotatably mounted in the lower or stationary lap and also in the holdbodily in a circle about the center of the lower or stationary lap; and fifth, arbors disposed symmetrically about the holding member upon which the articles may be rotatably mounted.

The method of operating the machine forming the present invention comprises the following principal steps; mounting the cylinders to be lapped in the holding mem- I mg member constraining the holding memher to rotate about its center and to move ber individually on the arbors above referred to, and rotating one of the laps, preferably the upper one, while the holding memher and cylinders are disposed therebetween,

continuing the lapping operation for a predetermined time, then removing the upper lap, and transposing or rearranging the reative positions of the cylinders in the group, and repeating the. lapping and trans posing operations alternately until identical diameters are obtained.

means of a shaft 16. The connection between the shaft 16 and the lap 15, as 1nd1-- cated by the screws -.17 and the holes 18 through the plate 19 to which the shaft 16 is fastened, issuch that the la 15 may adjust itself as to-parallelism wit the surface 12 of the lapll; The lower surface 20 of a the rotatable lap 15 is also carefully surfaced so that it is perfectly plain and is charged with a suitable abradant material.

Disposed between the contiguous surfaces 12 and 20 of the two la s 11 and 15 is a holding member, or spi er 25, most clearly shown in Fig. 2. This is preferably circular and rovided with a small hole 26 in its center in which a bearing member 27 may be disposed. Arranged about the periphery of the holding member or spider are a plurality of articlesA preferably symmetrically disposed about the center 26. These, as shown, are preferably disposed in elongated arcuate openings 31, four of these openings being shown, each of which has four arbors 30 mounted therein upon which the articles are mounted.' Preferably, the arbors 30 .may be supported in position in slots 32 and 33 cut through the spider 25, one end of the arbors 30- being cut away on either side as-shown at 34 in Fig. 3 so that they will be non-rotatably held relative to the spider. Preferably, I make these arbors 30 of a steel rod of a diameter as shown at 35, one end, as referred to above,

being cut away to leave the end 34 with" flat sides. The opposite end of the arbor 30 is screw threaded as shown at 36 upon which a nut 37 may be threaded and locked in position by small screws 38; The extreme outer end 39 of the arbor may be circular and adapted to fit freely within one of the depressions 32. Between thahead and the adjustable nut 37 on the arbors 30 I may meunt washers or'spacing members 40, any thickness being used so that-they; will accommodate the particular 'length of gage being lapped. Preferably, the slots 32 and 33 are of the same width, andthe parts 34 and 39 of the arbors 30 are of the same thickness so that the arbors 30 may be disposed in the spider with either end of the arbors 30 extending outward. Also the slots 32 and 33 are large enough to permit sliding movement of the arbors.

- From this construction, it will be seen that any diameter of cylinders A may be mounted on the arbors 30 and rotatably held thereon by the spacing members 40 and the nut 37. .Further, when mounted on the arbors30, the articles A being lapped are held in a symmetrical series evenly spaced about the holding member or spider 25. The arbors 30 within the slots 32 and 33 are free to adjust themselves vertically toward or from either of the la s so that slight variations in diameters o the articles may be compensated for by slight vertical movement of the arbors. v

In operation, the articles to be lapped are rotatably mounted individually upon their respective arbors, and the arbors disposed in position in the spider 25 while resting on lap 11. One end of a crank projects through the. bearing member 27, the opposite end of the crank 50 being disposed as shown in Fig. 1 in the hole 13 provided in the center of the stationary lap 11. With the parts so adjusted, the lap 15 is mounted so that it will rest upon the upper surfaces ofthe articles to be lapped. The shaft is then rotated by any suitable means, the lap 15 being free to adjust itself as to parallelism relative to the lapping surface 12 0f the stationary lap 11 and at all times contacts with the upper surfaces of the larger articles being lapped. Rotation of the upper la 15 by the shaft 16 tends to rotate the hol ing member or spider 25 in the same direction and the action of the short crank 50 or other suitable means in combination with the rotative action of the upper lapforces the holding member 25 not only to rotate about its own center 26 but also to rotate bodily about the center 13 so that it is bodily moved about the center of rotation of the laps 11 and 15 and also giving a free rotative movement about its own axis. As the articles are disposed non-radially, the effect of this rotative and planetary movement of the holding member causes a lapping movement of the articles A cross the lapping surfaces I 12 and 20 while the articles A are constant- 1y rotatin I a After the articles have been lapped a predetermined length of time. while retained in one position in the holding member, the upper lap 15 is removed and the articles A n the holding member 25- are transposed or interchanged relativeto each other, the upper lap 15 is then replaced and another lap v to which reference may be had for a full description. The'essential feature of this is that variations in diameters of the articles are so distributed that the upper lap contacts only with the larger articles.

One method of transposing is diagram- 'matically shown in Fig. 2 in which the double arrows point to the articles which are moved and indicate also the positions to which they are transposed. Simultaneously with the transposing of alternate cylinders to diametrically opposite positions, the cylinders. may be turned end for end to further distribute variations in diameters of the cylinders and to aid in obtaining absolute precision.

What I claim is: j 1

l. A lapping device comprising in combination, a lower lap, an. upper lap adapted to rest u on and adjust itself relative to the articles eing lapped, means for rotating one of said laps, a holding member for a plurality of articles disposed between said laps, said member being free to rotate about its own axis, and means rotatably connecting said holding member to one of said laps whereby the axis about which the holding member rotates is held at a constant distance from the axis of the rotating lap.

2. A lapping device comprising in combination', a lower lap, an upper lap adapted to rest upon and adjust itself relative to the articles being lapped, means for rotating one of said laps, a holding member for a plurality of articles disposed between said laps,

and means connected to the axis of one of the laps rotatably connecting said holding member to said lap whereby the axis about which the holding member may rotate is held at a constant distance from the axis of the rotating lap. j

3. A lapping device comprising in combination, a lower lap, an upper lap adapted to rest upon and adjust itself relative to the articles being lapped, means for rotating one of said laps, a holding member for a plurality of articles disposed between said laps,

and a short crank rotatably connecting said holding member to one of said laps whereby the arms about which the holding member may rotate is held at a constant distance from the axis of the rotating lap, and whereby'said holding member is free to rotate about its own axis.

4. A lapping device comprising in combination, a lower lap, an upper lap adapted to rest upon and adjust itself relative to the' articles being lapped, means for rotating one of said laps, a holding member disposed between said laps having a plurality of articles symmetrically disposed therein, and means rotatably connecting said holding member to one of said laps whereby the axis about which the holding member may rotate is held at a constant distance from the axis of the rotating lap, and whereby said holding member may rotate about its own 3X18.

5. A lapping device comprising in combination, a lower lap, an upper lap adapted to rest upon-and adjust itself relativeto the articles being lapped, means for rotating. one of said laps, a holding member for a plurality of articles disposed between said laps, and a short crank connected at one end to the lower lap and at its other end to the holding member and rotatably connecting said holding member to said lower lap whereby the axis about which the holding member may rotate has a planetary movement at a constant distance from the axis of the rotating lap. a j

6 A lapping device comprising in combination, a lower lap, an upper lap adapted to rest upon and adjust itself relative to the articles being lapped, means for rotating the upper lap, a holding member for a plurality of similar articles disposed between the contiguous surfaces of said laps, and a short crank rotatably connecting said holding member to one of said laps whereby the axis about which the holding member may rotate is held at a constant distance from the axis of the rotatin lap and the articles in being lapped are a apted to pass over the entire lapping surfaces of said laps.

A lapping device comprising in combination, a stationary la a rotatable lap adapted to rest upon an adjust itself relative to the articles being lapped, and a holding member disposed between said laps adapted to hold a plurality of articles to be hol ing member, said articles being rotatably mounted on said arbors.

8. 'A lapping device comprising in combination, a stationary lap, a rotatable lap adapted to rest 'upon and. ad'ust itself relative to the articles being lapped, and a holding member disposed between said laps adapted to hold a p urality of articles to be lapped in a symmetrical arrangement about said holding member, arbors symmetrically positioned on said holding member, said ar- 1toicles being rotatably mounted on said arors.

lapped, arbors removably mountedon said V 9. A lapping device comprising'in combination, a stationary 1a a rotatable lap adapted to rest upon an adjust itself rela tive to the articles being lapped, and a holding member disposed between said wla s.

adapted to hold a plurality of articles to e lapped, arbors removably-mounted on said holding member, said articles being rotatably mounted on said arbors, the axes of said arbors being tangent to a circle concentric With said holding member.

10. A lapping device comprising in combination, a stationary lap, -a rotatable lap adapted to rest upon and adjust itself rela-' tive to the articles being lapped, and a holding member disposed between said laps, arbors retained in the holding member adapted to hold a plurality of articles to be lapped in spaced relation to each other, said articles being rotatably mounted on said arbors and engaging said arbors on the end faces of recesses formed in said articles.

11. A lapping device comprising in combination, a stationary la a rotatable lap 2 tained in said slots'but ermitted to adjust 25 themselves verticall to old a plurality of articles to be lappe said articles being rotatably mounted on said vertically adjustable arbors.

In testimony whereof,I heretoali'ix my 30 signature.

BRYANT H BLOOD.

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