US2437002A - Ring grinding machine - Google Patents

Description

March 2, I94& J. H. RlEDLlNG 2,437,002

RING GRINDING MACHINE Filed Jan. 27, 1947 5 Sheets-Sheet 1 March 2, 1948. J. H. RIEDLING RING GRINDING MACHINE Filed Jail. 27, 1947 5 Sheets -Sheet 2 INVENTOR. Joy/v 4 /504 l/Yg; BY

Mardl 1948- .J. H. RIEDLING RING GRINDING MACHINE Filed Jan. 27, 194-7 5 Sheets-Sheet 3 INVENTOR. Jaw/v Al fiuou/vz;

March 2, 1948. -J. H. RIEDLING RING GRINDING MACHINE Filed Jan. 27, 1947 5 Sheets-Sheet 4 I INVENTOR.

Jon/v ll 0/504 mm M Marbh 2, 1948. J. H. RIEDLING 2,437,092

RING GRINDING MACHINE 5 Sheets-Sheet; 5

Filed Jan. 27, 1947 Patented Mar. 2, 1948 UNITED STATES PATENT OFFICE RING GRINDING MACHINE John H. Riedling, Memphis, Tenn., assignor of one-half to Margaret Wilkerson, Memphis,

Tenn.

Application January 27, 1947, Serial No. 724,611 Claims. (01. 51 1o3) vidually cast rings to remove the inequalities of the interior surfaces of the rings and bring these interior surfaces to the desired cylindrical or other form, and to subsequently grind the ring exteriors so that the wall thicknesses will be uniform. In accomplishing these operations, a roup of rings are hung around a grinding wheel and the wheel is shifted, contacting the rings with and holding them against rubber faced rollers by which the rings are turned until internal grinding is completed. Subsequently the wheel and rings are retracted, the rings are removed, and a new group of rings is put in place and the operation repeated, and substantially the same sequence of operations is followed for external grinding. Ring removal and placing is ordinarily done by a helper and the grinding by an experienced operator.

In both cases, the grinding operations are stopped during ring removal and replacement, the operating speed is substantially cut in half, and the machine operator and his helper are alternately idle substantially one-half of the time of each.

The primary object of the invention is:

To provide in a machine for grinding and finishing individually cast piston rings, dual means for separately supporting groups of rings for grinding, means for rotating said rings, means for grinding said rings, and means for shifting said supporting means to alternately bring first one and then the other thereof and the rings carried thereby into driving and grindin relation with said driving and grinding means and concurrently moving the other thereof away from said means and into position for unobstructed removal and replacement of the rings carried thereby during continuance of grinding action on the other thereof.

The meansby which the foregoing and other objects are accomplished and the manner of their accomplishment will readily be understood 2 f from the following specification upon reference to-the accompanying drawings, in which:

Fig. 1 is asectional elevation of the machine as set up for internal grinding, taken on the line I-I of Fig. 2.

Fig. 2 is a related plan view.

Fig. 3 is a side elevation with the bed. partially shown in section. i

Fig. 4 is a fragmentary sectional plan of the bed taken on the line IV-IV of Fig. 3.

Fig. 5 is an end elevation indicated by the arrows VV of Fig, .2, showing the ring rotating drive.

Fig. 6 is a sectional end elevation taken on the line VI-VI of Fig. 2.

Fig. '7 is a sectional elevation taken on the line VII-V11 of Fig. 8, showing the machine set up for external grinding of the rings.

Fig. 8 is the corresponding. plan view,

Fig. 9 is an end elevation indicated by the arrows IX--IX of Fig. 8; and

Fig. 10 is a sectional elevation taken on the line X X of Fig. 8.

Referring now to the drawings in which the various parts are indicated by numerals:

In all of the views, 15 is a bed which is preferably supported, as indicated in Fig. 3, by legs l1. Mounted transversely across one end of the bed I5 is a uide member l9 which may be longitudinally oscillatable thereon and be confined and guided in such oscillation by gibs 20. The guide member [9 slidably supports an integral slide 2| which is confined in the guide member by gibs 23, the slide 2| being .shiftably movable by a manually operable handle 25. The lower end of the handle is pivotally secured to a bracket 21 extending from the bed 15, or the guide member, and the handle is coupled to the slide by links 29.

For internal grinding, heads 3| are mounted on the slide 2|, the heads 'journalling parallel shafts 33, which are driven through pulleys 35, as by belts 31, indicated in Fig. 1 only. The shafts 33 are disposed longitudinally with respect to the bed, and oppositely to the pulleys 35 extend inwardly beyond the heads 3| and carry abrasive drums 39 above and adjacent the center of the bed. The heads 3| also carry ring supports 4| which extend inward into overlying relation to the abrasive drums 3%, these supports being each adapted to independently hold a group of rings 43 around, but out of contact with the grinding wheels. I

Mounted on the opposite end of the bed l5 are brackets 45 which journal a longitudinally disposed shaft 49. The shaft 49 extends outward beyond the bed and has secured thereon a pulley I through which it is driven and gears 53 and 55 which it drives. Pivoted on the shaft 49 are arms 51 and 59 which respectively carry heads 99 and BI. The heads 60 and BI journal shafts 63 and 65 which extend inward parallel with the drums 39 into overlapping relation thereto and carry rubber faced ring rotating rolls 61 and 99. At their outer ends the shafts 63 and 65 carry gears 1| and 13 which mesh with the gear 53 by which they are driven. The arms 51 and 59 extend oppositely also from the heads 69, GI and are coupled through links 15 and 19 to a nut 8i mounted on a screw 83, which is carried by a bracket 84 and which is manually adjustable to shift the arms 51 and 59 about the shaft 19 and vary the spacing of the rubber faced ring rotating rolls B1 and 59.

The gear 55 through an idler gear 85 may drive a gear 81 mounted on a cam shaft 99 journalled in the bed I5. The shaft .89 carries an end thrust cam 9|, against which a rod 93 is held by a spring 95. The rod :93 is reciproca-bly mounted in a hollow screw 91 against which the spring 95 bears and by which the tension of the spring is adjusted. The guide member 19 is coupled to the rod 93 through a bracket 98, and is reciprocated by rotation of the cam 9| and reaction of the spring 95.

For external grinding, brackets IIJI extending upward from the guide member I9 carry a head I93 journalllng a shaft I95 which carries on its outer end a driving pulley I01 and on its inner end an abrasive drum I09. Brackets H3 are substituted for the heads 3| and secured to the slide 2I. These brackets carry stub shafts H5 .on which are journalled polished steel rollers H1 which serve initially as supports for the groups of rings, andduring grinding as abutments which position the rings for grinding and by their spacing from the abrasive wheel I99 determine the thickness of the rings.

On the opposite end of the bed, the brackets 45, as before, journal the shaft 49, which carries the driving pulley 5| and the driven gears 53 and 55. Two sets of elastic faced ring rotating rolls I2I, I23 are alternately used, these rolls being respectively carried by shafts 1'25, I21 journalled in heads I29, I3I, which, as before, are carried I by arms I33, I35, pivoted on the shaft t9 and respectively are adjusted by screw, nut and link assemblies I31, I39. Gear 53 meshes with pinions I41, I43 on the shafts I25, I21 respectively and drives these shafts and the rotating rolls carried thereby and gear 55 through idler 8-5 drives the cam shaft 89, as before.

It will be understood that the bearings herein described may be plain bearings or ball or roller bearings as may be preferred.

The machine may be set up for internal grinding, as shown in Figs. 1 through 6, and after sufficient rings have been ground, may be changed over, as shown in Figs. 1 through 10, and the necessary external grinding be done, or it may be and often is preferable to set up two machines, one equipped for internal and one for external grinding so that the latter operation may immediatel and almost concurrently follow the former.

In use, the machine set up for internal grinding is first employed. The drives for the elastic faced ring rotating rolls 61, 69 and the abrasive drums 39 are started and by means of the arm 25 one or the other of the ring supports M, and the related grinding drum 39 are shifted away from contact with the rolls E1, 59. Preferably, but not necessarily, the driving belt 3? of the abrasive drum, as the drum is shifted away from the rotating rolls, is slackened by the shift and the speed of the drum allowed to slow down. A batch or group of rings 43 is hung on the related support GI over the drum with the rings around both thereof, but out of contact with the drum. The arm 21 is shifted bringing the exterior surfaces of the rings so supported against the retating rolls, and the abrasive drum into grinding relation with the rings and at the same time tightening the driving belt of the abrasive drum and grinding is proceeded withuntil the internal grinding of the ring is completed. Concurrently the other of the supports GE and related abrasive drum 39 are shifted away from the rotating rolls setting them up to permit placing of another group of rings for grinding and in subsequent operations for removal of internally finished rings, and similar replacement.

'After the rings have been internally ground they are transferred to the machines set up for external grinding, one of the steel rollers H1 is shifted away from the grinding wheel I99 and ring rotating rolls IN, or I23, as the case may be, and a group of rings d3 hung on the roller. Shift is made by the arm 25 to bring the rings so supported against the rotating rolls I23 and the abrading drum I99 and the other of the rollers II1 away from grinding relation and into position to receive an additional group of rings. Subsequent to completion of grinding of the first group the second group is shifted by movement of the same arm 25 into grinding relation and the first said roller and group of rings away from such relation and into position for ring'removal and replacement and repetition of the cycle,

It will be understood that for'internal grinding the spacing of the ring rotating rolls must be adjusted by shift of the nut 81 along the screw 93, and for external grinding both sets must be similarly adjusted to compensate for varying ring diameters. During grinding the cam 9| and spring constantly reciprocate the abrasive wheel relatively to the rings being ground. Preferably the rotating rollers are driven in opposed direction relatively to the abrasive drums.

A set screw M5 and complementary slot I41, closed at its opposite ends, or other stop means, limit the opposite shifts of the slide 21 for internal grinding and a similar but larger slot I49, and set screw I55 limit the opposite movements of the slide for external grinding, one or the other of the set screws being used as the operation being performed requires.

I claim:

1. A machine for grinding piston rings, including ring grinding means, elastic faced ring rotating means, means for driving said grinding means, means for driving said ring rotating means, dual means for independently supporting groups of rings out of contact with said grinding means, and said driving means, means carrying both said ring-supporting means, and manually operable means for shifting said carrying means to bring rings carried by either one .of said supporting means at option into rotating and grinding contact respectively with said rotating and grinding means, and rings carried by the other of said supporting means concurrently away from said contacts and into accessible position for removal of rings from, and placement of additional rings on, said supporting means.

2. A machine for grinding piston rings including dual ring grinding means, elastic faced ring rotating means, means for driving said grinding means, means for driving said ring rotating means, dual means for independently supporting groups of rings for grinding, out of contact with said grinding and said driving means, means carrying both said ring supporting means, and said dual grinding means, manually operable means for shifting said carrying means with reference to said ring rotating means to bring rings carried by either one of said supporting means at option into rotating and grinding contact respectively with said rotating and grinding means, and rings carried by the other thereof concurrently away from said contacts and into accessible position for removal of rings from, and placement of additional rings on, said supporting means.

3. A machine for grinding piston rings, including ring grinding means, elastic faced ring rotating means, means for driving said grinding means, means for driving said ring rotating means, dual means for independently supporting groups of rings out of contact with said rotating and said grinding means, means carrying both said ring supporting means, and manually operable means for shifting said carrying means with reference to said ring rotating means and said grinding means to bring rings carried by either one of said supporting means at option into rotating and grinding contact respectively with said rotating and grinding means, and rings carried by the other thereof concurrently away from said contacts and into accessible position for removal of rings from, and placement of additional rings on, said supporting means.

4. A machine for grinding piston rings, including a bed, a slide mounted for transverse shift across said bed, a pair of heads carried by said slide and spaced horizontally apart therealong, abrasive drums journalled respectively by said heads and extending longitudinally therefrom, means for driving said abrasive drums, related ring supports carried by said heads and overlying said drums, a pair of elastic'faced ring ro- 6 tating rolls, spaced vertically apart, between said abrasive drums, bearings carried by said bed journalling said rolls and means for driving said rolls; and manually operable handle means for shifting said slide to bring either of said abrasive drums into grinding contact with said rings therearound and said rings into contact with said rotating rolls, and the other said drum away from said rolls for removal and replacement of rings around said drum, the spacing of said abrasive drums and related ring supports along said slide being sufiicient to insure rings supported by one' said support being moved clear of said rotating rolls when rings carried by the other are in rotating contact with said rolls and grinding contact with said abrasive drum.

5. A machine for grinding piston rings, including a bed, a slide mounted for transverse shift across said bed, a pair of cylindrical metal ring supporting rollers spaced horizontally apart along said slide and journalled by and extending longitudinally therefrom, bearings carried by said bed at the level of said rollers, a shaft journalled by said bearings and extending longitudinally therefrom and between said rollers, carrying an abrasive drum, and means for driving said shaft and drum, elastic faced ring rotating rolls in pairs spaced laterally on opposite sides of said drum with the rolls of each pair lying respectively above and below said drum, bearings carried by said bed journalling said rolls and means for driving said rolls; and manually operable handle means for shifting said slide to bring rings carried by either of said rollers into grinding contact with said abrasive drum and into rotating contact with a related pair of said rolls, and the other said roller away from said drum and rolls for removal and replacement of rings around said drum, the spacing of said rollers along said slide being sufficient to insure rings supported by one thereof being moved clear of said rotating rolls and drum when rings carried by the other thereof are in rotating contact with said rolls and grinding contact with said drum.

JOHN H. RIEDLING.

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