US2388872A - Milling machine - Google Patents

Description

Nov. 13, 1945.

H. M. SCARFF MILLING MACHINE Filed Jan. 24', 1944y 3 Sheets-Sheet 1 lnuenior igl 'Ho'roldP/loarff B5 QW 4 Nov. 13, 1945. H, M. SCARFF 2,388,872

MILLING MACHINE n Filed Jan. 24, 1944 3 Sheets-Sheet 2 Imm/Won Hamm Mmf www Nov. 13, 1945. H. MSCARFF MILLING MACHINE ZISheets-Sheet 5 Filed Jan. 24, 1944 Patented Nov. 13, 1945 MILLING MACHINE Harold M. Scar", Muskegon, Mich., assigner to Muskegon Piston Ring Company,

Muskegon,

Mich., a corporation of Michigan Application January 24, 1944, Serial No. 519,474

4 Claims'.

This invention relates to milling machines. One place where the milling machine ofthe present invention is-very useful is in cutting the gap piecepartings or segmentsfrompiston ring castings, it being understood that the ring castings are of an out-of-round form and of a character such as madey by cutting a circular pattern of the' proper dimensions at' one side and inserting a short segment between the ends of the pattern and casting the'ri'ngs from the out-of-round pattern thusproduced In finishing the piston rings asegment or gappiece' comparable to the segment which was inserted inthe pattern is removed in order that the finished rings when closed at theV parting thus made willl have a circular formv and conform to the walls ofthe cylinder inwhichthey are u sed and with the ends of the ring brought substantially together. Furthermore, the cutting of the gap piece segment initially does not complete the finished machining of the ends of the piston ring'and in a further step of the process of the completing of the finishing of the piston rings, it is desirable that the ends of the ring be finished machined and the present invention is useful for that purpose. While the machine disclosed as an embodiment of the invention is one which is in daily use for the purposes stated with reference to piston ring production, there are many other places of use for the invention and the'invention is not to be considered as restricted' solely topiston ring manufacture.

Itv will be apparentthat tol cutvthe gap piece or segment from thel piston ring castingsA onv radii of the casting, when the two ends are brought together they: will notv come into directl abutting engagement but. the space between the ends of thepiston rings will be wider at. one side than the other and thoughy the difference inwidth is smalll andmeasured in thousandths or ten-thousandths of. an inch, such character'of` parting in a piston ring.l is undesirable and is,l not asY good as oneinv which the ends of the piston-rings when brought together are substantially exactly'parallel. With the present inventionsuch: parallelismy is obtained and at the same timerazhigh: quantity production isy possible, thesegments beingl milled from the piston.` ringy castings rapidlyl andY accurately; and also: the: finish machining.

Anf understandingY of the invention may be had from the following. description: taken iny connection with the accompanyingr drawings of a practical. and inY use embodiment of theinvention in which,

Fig. 1 isl a front elevation' of' the milling machine. Fig. Zis-a plan View thereof. y Fig. 3lisk a Vertical section froinfront to rear of the upper' part of the machine, substantially' on the plane of line 3-3f' of Fig. l, and

Fig. 4 isa viewf enlarged, showing the manner of milling the gap-piece from apiston ring cast-l mg. f f Like reference characters refer' to lik'e parts in the different iiguresY of the" drawings. In the constructionl a lower basey support having lateral-wings I anda central support Ia extendingferward of the wings is provided. At'the upper endsl of the lateral wings I housing -supports 2` anda extend upwardly and are spaced apart from' each other as best shownfin Fig. 1-, the support 2- being located rearward ofv support 2a'.

'At the front side of eachA oftheI housing sup'- ports 2 and Za a vertical! member 3 is mounted for sliding adjustment and is raised and lowered by mea-ns of a screw shaft 4 at ,the upperend of which a manually operable crank or handle' 5 is secured. At the front side of each of thel members 3V a horizontal slide 6 is mountedy thereon and is adjusted to different positions by means of a screw shaft I operated by a crank or handle The extent or amount of adjustment in each case' is indicated byvsuitableiindicating scales shown at 9. l

At thefront of each of thevslides 6 a generally VerticalV plate IUis pivotally mounted on the slide 6 on a pivot I I between its upper and lower ends (Fig. 1). Adjacent its lower end each `of the plates I0 has an arc-shaped slot I2 through whichV a bolt I 3 extends from the lower part of the associated slide 6 to receive a nut whereby theplates I0 may be `angularly adjusted about the pivots II and flxedly secured in any position to which adjusted'.

The plates Ill between the pivots llandthe bolts I3 are provided with transverse journals It in each of which a shaft I5 is mounted for p rotation.A As shown the housing support 2. is disposed back ofthe support 2a, therefore the shaft' I5 carried by support 2a is located. in front of the shaft I5= carried on the support 2 asin Fig.. 2,. Adjacent the free ends of the shafts I5;`

said` shaftsl extending toward and passing by each. other, a milling cutter IS, Ita is releasably secured. As-shown in Fig. 1- theV two cutters, one

located back of the other-are disposed' in planes l each at anacute angle toa vertical` plane between them. At the outer end ofi eachof the shafts lliv a driven pulley or wheel I1 is secured. At the upper ends of each of the plates I and at the front thereof an electric motor I8 carried on a supporting bracket I9 has its shaft equipped with a driving pulley or wheel which, through an endless belt 2I passing around it and the wheel I1 below, operates to drive a shaft I5. Each of the shafts are independently driven as is evident.

Above the central forwardly extending supporting member Ia of the main base support a horizontal table 22 is mounted on suitable guides or ways for reciprocation from front to rear. YNear the back end of the table an integral arm 23 extends downwardly therefrom and is connected with a piston rod 24 which enters a horizontal cylinder 25 and is connected with a suitable piston therein (not shown). The entrance of pressure alternately at opposite sides of the piston within the cylinder serves to reciprocate the rod 24 with an accompanying reciprocatory movement of the table 22. The entrance of the fluid pressure into the cylinder at either side of the piston 25 may be controlled automatically by a suitable control 25a mounted at a side of the supporting member la and engaged by an operating block adjustably mounted at a side of the table 22 as shown in Fig. 1. The detail of the control of the table through said piston cylinder apparatus is not shown as it is old and well known and available to those skilled in the art.

At the upper side of the table 22 a fixture 26 is bolted, having two spaced vertical ends 21 and 28 and horizontal side bars 29 extending between the ends to each of which a member 30 is adapted to be adjustably secured. Said members 30 extend upwardly and at an angle toward each other and at their upper portions are provided with relatively long contact blades adapted to come one at each side of a plurality of piston ring castings located between them.

The inner or rear end 28 of the fixture has a cylindrical guide 3| cast integral therewith through which a plunger 32 is mounted for sliding movement, at its inner end being equipped with a head 33. The plunger 32 is operated by means of a bell crank 34 engaging at one end with the plunger and pivotally mounted between its ends at 35 on the rear end 28 of the xture. The end of the other arm of the Vbell crank 34 is pivotally connected to a piston rod 36 which extends into a cylinder 31 and is connected with a piston therein (not shown), the cylinder 31 being mounted on a suitable bracket 31a carried by and movable with the table 22. Said cylinder 31 is adapted to have a fluid pressure medium conducted to it at either side of the piston therein for moving the plunger 32 and attached head 33 in desired directions.

In the upper side of the front end 21 of the xture and in the upper edge of the head 33 notches 38 (Fig. 1) are cut for the reception of a at bar or other like support on which a plurality of piston ring castings 39 may be disposed with their sides in engagement. The piston ring castings will be located on the bar Vfrom which they are suspended with all of the segment portions thereof over the bar. It is to be understood that in casting the piston ring castings the places where the segments or gap pieces are to be milled therefrom are properly marked in casting as, for example, by a groove at the inner side of the segment portion extending from one side of the ring to the other so that the one who loads the ring castings on the bar can readily dispose the segments which are to be milled at their proper places. The bar with the plurality of ring castings thereon is laid at its end portions in the wide slots or notches 38 and uid pressure is introduced into the cylinder 31 below the piston therein to force the head 33 against the ring casting at the irnerI end of the plurality of ring castimgs, clamping them snugly against each other and against the front end 21 of the fixture described. The ring castings are held clamped against 4each other and are ready to have the milling operation performed thereon for removal of the segments or gap pieces.

While I have described the specic and particular xture which is used in the initial milling of the gap piece segments from piston ring castings, it is to be understood that the fixture 26 which is bolted to the upper side of the table 22 is removable from the table and may be replaced by other xtures of like nature for different sizes of piston ring castings; or by f1xtures of a different nature for the handling of the piston rings after the gap piece segments havebeen initially cut therefrom and the ends of the rings are to be finished milled.

The ring castings 39 clamped together in side by side relationship and lying with their axes horizontal are centered by the engagement of the members 30 against opposite sides thereof (Fig. 1). On rearward movement of the table 22 the ring castings are brought successively to the milling cutters Ilia and IB, and the gap piece segments shown at 48 in Fig. 4 are cut in succession one from each of the ring castings. The lower edge portions of the milling cutters pass through the slots or recess at 38 as shown in Fig. 1. Because of the adjustment of the plates ID about the axes of the pivots at I I the milling cutters I6 may be located at desired selected angles to the vertical suchthat the two ends of a ring casting after the gap piece segment has been removed will come into direct abutting engagement upon contracting the ring casting, and the surfaces of said ends will lie in parallel relation to each other.

It is further apparent that because of the vertical adjustment provided by the mounting of the members 3 on the housing supports 2 and 2a the milling cutters may be adjusted vertically for ring castings of different diameters; and that because of the horizontal adjustment of the slides 6 upon the members 3 the milling cutters may be e adjusted inwardly or outwardly for the milling of any desired or preselected width of gap. The machine, therefore, is useful in its milling operations for a large number of sizes of ring castings, having a wide range of adjustment to take care of different sizes or diameters .of the castings and of different lengths of parting segments to be cut therefrom. And with any ring castings of whatever diameter being processed and with whatever length of segments is cut the milling cutters may be located in a proper angular position so that the ends of the ring castings after the parting segments have been removed Will come together when the casting is closed without the two ends disposed at an acute angle to each other but in parallel relation.

The construction described is in practical use and operation and is completely satisfactory for the purposes for which it is designed. It is used for the initial milling of the gap segments and also for the final or finished milling of the ends of the piston rings at the partings or gaps The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

l. In a milling machine, horizontally spaced vertical supports each having a vertical front face and one of said supports being located back of the other, a member mounted for vertical sliding adjustment on the front face of each support, means for adjusting said member, a slide mounted at the front of each of said members for horizontal adjustment, means for adjusting said slides, a vertical plate pivotally mounted between its ends on each of said slides to turn about a horizontal axis, said plate having a transverse journal, a shaft mounted for rotation in said journal, means for holding each of said plates at any position to which it may be turned about its pivot, a milling cutter mounted on and rotatable with each shaft, said shafts extending toward each other and one being located back of the other, and means mountedon each of said plates for driving its associated shaft.

2. In a construction of the class described, spaced vertical supports each having a substantially vertical front face, the face of one of said supportsbeing located in a plane back of the face of the other support, a vertical member mounted for vertical sliding movement on each of said supports of said face, manually operable means for adjusting each of said members, a slide mounted for horizontal movement on each of said members, means for manually adjusting said slides to predetermined selected positions, a vertical plate pivotally mounted between its ends on and at the front of each slide to turn about a horizontal axis, a transverse journal on each of said plates located below its pivot, a shaft mounted for rotation on and extending through each journal, said shafts carried by said plates extending toward each other with one located back of the other, milling cutters mounted on the adjacent end portions of said shafts, means for holding each of said plates in any selected position to which it may be turned about its pivot, and means mounted on each of said plates for driving the shaft carried thereby.

3. In a construction of the class described, two rotatably mounted shafts, said shafts occupying a generally angular position to the horizontal, said shafts extending toward each other and with their axes located in different vertical planes one back of the other, milling cutters secured to and rotatable with the shafts and connected to said shafts at their overlapping end portions, means for driving said shafts, and individual means for changing the shafts in vertical position, in angular position and in relative horizontal position, each of said means being separately operable, as specified.

4. In a milling machine, a horizontal reciprocable table upon which Work is adapted to be held and mounted for milling operations, two shafts extending toward each other with one back of the other located over said table and underneath which the work is adapted to be passed, means for mounting said shafts for rotation, a milling cutter secured to each shaft, said cutters being secured to the shafts at their adjacent end portions, means for adjusting and securing the shafts at selected angular positions to the horizontal, means for moving said shafts bodily in vertical directions and means for adjusting said shafts horizontally to diierent relative positions with respect to each other.

, HAROLD M. SCARFF.

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