US2795900A

US2795900A - Machine for grinding and superfinishing barrel-shaped rollers and the like

Info

Publication number: US2795900A
Application number: US446259A
Authority: US
Inventors: Modler Hans
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-07-28
Filing date: 1954-07-28
Publication date: 1957-06-18
Anticipated expiration: 1974-06-18

Description

June 18, 1957 2,795,900

H. MODLER MACHINE FOR GRINDING AND SUPERFINISHING BARREL-SHAPED ROLLERS AND THE LIKE Filed July 28, 1954 3 Sheets-Sheet 1 firroR/vE ms June 1957 H. MODLER 2,795,900

' MACHINE FOR GRINDING AND SUPERFINISHING BARREL-SHAPED ROLLERS AND THE LIKE Filed July 28, 1954 3 Sheets-Sheet 2 m H I i i 28 H 'r-rl K ,7

i} l} I! l} 50 5 27 1' ll II M JP-J1 N L\ S H 30 25 J5 3 w j Z ,v as 4 Inventor." Hfl/vs Noun? ,9rro mws'rs June 18, 1957 H. MODLER ,79 ,900

. MACHINE FOR GRINDING AND SUPERFINISHING BARREL-SHAPED ROLLERS AND THE LIKE Filed July 28, 1954 3 Sheets-Sheet 3 MACHINE FOR GRINDING SUPERFINISH- ING BARREL-SHAPEDROLLERS AND *THE" LIKE Hans Modler, Aschafienburg, Germany Application-July 28,1954, Serial No. 446,259

8 Glaims. 4 (Cl. 51-108) This invention has reference-to a'machine' for the centreless grinding and honing; orsuperfinishing, ,of "the crowned surfaces of'barrel-shaped antifriction rollers and similar bodies, and itparticularly-relates to a machine for this --purpose, having a concavely shaped vrevoluble grinding wheel, or a reciprocating.superfinishingtool respectively, and a cooperatingregula-ting r whee1,- between which the workpieces are rotated.and,thereby,- operated upon and fed through the machine in arevoluble carrier substantia-lly, resembling the shape of Ithe working throat rof the machine at its work-presenting section.

In the known. grinding devicesof this type the support of the .workpieces which, for the sake of simplicity, will :hereinafter be referred to as-rollers, on-their carriers has .not been able to meet the-requirements of practice. 'It

--.was -unstable1and the rollers, being-supported on their .greatcircles only,'cou1d deviate invarious directions and were even able to edge between the grinding andtregulat- .,.in \vhee1s. Forthese. and other. reasons it has been ex- ,ceedingly.difficult up to the present toobtain that-rac- .cur.acy in finishing. crowned or barrel-shaped roller surfaces which,.however, is of paramountimportance in the .construction of. antifriction bearings.

'-It is, therefore,.the principle object of the.invention-to remove these. discrepancies andtoprovide a device .which will be simple in construction and lefiectiveinruse. andin whichrollers of crowned or barrel-shapecan beground and finished tothe highest-degree of accuracy.

Another object is the provision of a device in which means are provided for guiding the rollers .through the .machine and for thereby holding them revolublybut bodily immovable on their carrier to be acted upon :by the operating tools of the machine.

Afurther object oftheinventionrests intheprovisiou of means for continuously feeding the rollers into-the machine and for automatically rejecting .them from the United States ?atent ('3 however, is not shown in the drawings with the exception of some partswhich will be-referred to in connection with vFig. 3. The revolublegrinding'wheel 1 is provided over --its circumference--with a concave grinding surface, while 2,7 95,900 Patenixed. June 18, 1957 ice operating tools at the same timeandina mannerwhich prevents. any side movement, tipping or thelike," of the rollers while they'are beingacted upon-:during their passage ;through the machine.

' The invention -is illustrated in'ithe accompanying drawingsrby' way of example.

Fig. 1 is a longitudinal :vertical-section through the grinding device. on the line II-ofF ig. 2 as seen in the direction 'of' the arrow.

Fig. 2 isaplanview ofFig. has-seenin thedirection -of. the-arrow II of that figure.

Fig. 3: is a crosssection-similarto Fig. l of the "honing or superfinishing device, and

.Fig.-4-a plan view similar. to Fig. 2 of the device shown in Fig; .3.

' In these figures;particularly in Figs-l and '2. the grinding wheel of a-plaimgrinding machine suitable for circular work isdenominatedZ'by-the numeral 1 and the regulating wheel'byz. 'The'latter-is journaledwith its shaft 3 between the centre points ofthegrinding machine which,

the. regulating wheel 2 is 'Z of spherical shape as "shown in Fig. 2. Both wheels-'rotatein mutually opposite direction as indicated bytthe arrows;

'Arrangedton =asconical head between the two wheels -1i and .2 is .a circular :cage 4 around "the circumference .of which .a number of'dndividual chambers 5 is provided -.which:.open:outwardlymndin which the rollers aresup- :ported with their" parallel 'en'd 'walls in intimate contact with the side walls of the chambers 5. 'These sidewa lls prevent axial and tipping movement of therollers; which are further stabilizedcin their position on :the carrier 4 :by -the bottom .of each-of the chambers being-recessed in the middle as at '5', .so that the rollers are supported on two= points and,-inthis wayjfurther resist anytendency of: tipping or edging.

-Cage 4 together withzits conical head is keyed or otherwise'fixe'd to theupper end of-a shaft'7 which is driven by a wormsgear 8 at its-lowerendand by which it is rotatedtogether with'the rollers 6 encagedtherein at a slow speedain comparison-with the 'rotary speed of the wheels carrier after treatment.

.cage is provided around its circumference with individual "r-charnberswppen to the outside; the said carrier ibeing rotated at a comparatively slow speed in the feeding direction of the rollers, which are thereby presented to both the grinding wheel, or the honing tool respectively, and the regulating wheel.

By means of the individual chambers just referred to and which are suited to the crowned shape of the rollers and adapted laterally to engage between parallel end Walls of the same, several rollers can be presented to the The common turning axis of the shaft '7 and'of the cage .4 is positioned was to intersect aplane'which passes through the turning axes 'of'the grinding wheel and of the regulating wheelat' an acute angle ,8, whereby it is possibletoarrangethezshaft 3 'of'the regulating-wheel so as to-approach" the cage 4 very closely, as'will be seen from Fig. 1. The 'spherical surfaceof the'regulating wheel 2 hereby idips into :the excavation 13 "of the cage 4 and its supporting head. The worm gear 8 is preferabl'yenclosed in a ."gear box '8 which is fitted to the machine "bed 7'in which'alsothe shaft'7 of the cage 4 is arranged to rotate.

The substantially barrel=shaped rollers 6 are fed into the chambers "5' of :the vcage 4 through a channel or 'race- 'way 9, whereby the introductionof the rollers can be facilitated'by the outer portions of the separating walls of-the chambers S'being slightly rounded. After the rollers have been operated :upon-during the slow rotation'of the cage 4tinzth'e working 'thro'at 6' between the" grinding wheel 1 and the regulating wheel 2 they are discharged by coming into contact with an inverted cone 12 on shaft 3 adjacent the regulating wheel 2 and rotated therewith, whereby the rollers are lifted and prized out. It will be seen from Fig. 2 that a circle passed around the rollers 6 in the cage 4 has its centre at C with the radius R. The concave curvature of the operating surface of the grinding wheel is centered at C and its radius R is of the same length as the radius R so that the rollers are automatically ground true to the curvature of the grinding wheel without the risk of their deviating to either side because of their being confined in position by the fixed walls of the chambers 5. a r

After the rollers have been ground in the manner described they are honed, or superfinished, in the same or similar manner on the honing device illustrated in Figs. 3 and 4. As in the former case a regulating wheel 15 and a discharge cone 16 is provided on the shaft 14 of the regulating wheel, which shaft may be arranged between the centre points of a plain grinding machine as in the device shown in Figs. 1 and 2. The cage 17 for the rollers to be honed resembles the aforedescribed cage 4 and is also provided with a plurality of individual chambers 18 within which the rollers 6 are confined so as to protrude slightly beyond the periphery of the cage 17. The latter is keyed to the shaft 20 adapted to be rotated by the worm gear 23 in a bearing block 22 of the machine bed 21.

Turnable upon the bearing block 22 and an intermediate pin bearing 25 is a rocking lever 26 carrying at its free end a member 27 adapted to reciprocate a slide 28 with the honing stone 30 fastened to it. Vibration is imparted to this system by an oscillator or the like 31 over a ball' head socket 32, which movement is then transformed into a circular reciprocating movement by the said lever 26 and member 27 and transmitted thereby over the slide 28 to the honing tool 30. This tool, therefore, also reciprocates in a circular path true to the surface of the rollers 6 which are thus superfinished in the radius R as has been described with reference to Figs. 1 and 2.

Rotation is imparted by the regulating disc 15 and the pressure Wheel 33 to the rollers 6. The pressure wheel may be coated by a sheet of vulcanite 34 or the like Admission of the rollers into the chambers 18 is effected over a raceway 35, as in Figs. 1 and 2, and the discharge by the discharge cone 16 on shaft 14.

What I claim is:

1. In a machine for the centerless shaping of the curved outer surfaces of crowned rollers, such as barrel-shaped antifriction rollers and the like, by means of a surfacing tool and having a revoluble circular cage member serving as a work rest, a plurality of roller-receiving chambers spaced around the circumference of said circular cage member open to the outside and with mutually parallel side walls, and a regulating wheel in contact with the rollers while they are being operated upon by the surfacing tool, a rotary shaft for the said circular cage member disposed at an angle to the said surfacing wheel, a rotary shaft for the said regulating wheel at substantially right angles to the shaft of the cage member, and an axially disposed excavation in said cage member affording space for the rotation therein of the lower part 7 of the regulating wheel, said circular cage member being arranged to revolve below the shaft of the regulating wheel so as to allow for the free rotation of saidcage member underneath the driving shaft ofthe regulating wheel.

- 2. A machine for operating on the surfaces of crowned roller as set forth in claim 1, in which the axis of rotation of the cage member and the axis of rotation of the regulating wheel intersect each other. a

3. A machine for operating on the surfaces of crowned rollers as set forth in claim 1, comprising means for dis charging the rollers from their chambers, said means consisting of a discharge cone on the shaft of said regulating wheel adjacent the said wheel and revoluble therewith and by means of which the rollers on coming into contact therewith are lifted and prized out of their chambers.

4. In a machine for the centerless shaping of the curved outer surfaces of crowned rollers, such as barrel-shaped antifriction rollers, by means of a surfacing tool and having a revoluble circular cage member serving as a work rest, a plurality of roller-receiving chambers spaced around the circumference of said circular cage member, parallel side walls to the said chambers, and means for maintaining the rollers in contact with said surfacing tool during operation, a regulating wheel of substantially spherical formation, a shaft for driving said regulating wheel in contact with the rollers to be ground, a surfacing tool having a concave working edge of arc-shaped formation, a circular cage member revoluble in cooperation with said concave surfacing edge at right angles to the shaft of said regulating wheel, the roller-receiving chambers being so spaced around the circumference of said cage member as always to move a plurality of rollers along said surfacing edge thereby to enable a continuous operation on the said rollers, and a two-point support in each of the said chambers for centering the rollers in conjunction with the parallel side walls of the chambers in relation to the surfacing tool, said circular cage member having its shaft disposed at an angle to the surfacing tool and ending below the shaft of the regulating wheel to allow for the free rotation'of the cage member underneath the said shaft.

5. Ina machine for operating on the surfaces of crowned rollers as set forth in claim 4, in which the said concaveedged surfacingtool is a substantially plane superfinishing stone, means for imparting to the said stone at reciprocating arcuate motion, comprising, a member producing a linear motion and a pivoted lever transmitting said 5 linear motion into a circular motion along the surfaces of the consecutive rollers as they are moved along the said concave working edge of the surfacing tool in cooperation therewith.

6. In a machine for operating on the surfaces of crowned rollers, such as barrel-shaped antifriction rollers and the like, by means of a reciprocating superfinishing member,

a substantially plane surfacing tool, a concave working edge of arc-shaped formation on the said tool, a work rest comprising a circular head, individual chambers around the, circumferenceof said head forthe accommodation of said barrel-shaped rollers while they are being operated upon, a regulating wheel of substantially spherical formation contacting with said rollers at one side thereof, parallel side walls to the said individual chambers, a substantially vertical shaft for rotating said circular head, a pressure roller contacting with said barrelshaped rollers at approximately the other side thereof, a slide carrying said reciprocating superfinishing member,

' a device for producing linear reciprocating movement, a

pivoted lever in connection with said slide and pivotally arranged on the vertical shaft of said circular head for transforming the linear reciprocating movement into a circular reciprocating movement of the slide carrying said I superfinishing member.

References Cited in the file of this patent