US1544038A - Apparatus for making cores - Google Patents

Description

'June,3(), 1925.

. D. J. RYAN APPARATUS FOR MAKING coms Filed Oct. 29, 1922 3 SheetS-Sheet l rmeA/Ey D. J. RYAN APPARATUS FOR MAKING CORES Filed oct, 28. 1922 3 Sheets-Sheet 2 1-5:-; ,5% u .3 I .7 Il 4 M.. a x .5 (,a nO rrimkml z 5 3m w u 0 a u v ,4 Jaz June 30, 1925.

June 30, 1925.

l f D. J. RYAN APPARATUS Fori MAKING comas 3 Sheets-Sheet 5 C ml,

Y hva/woe PAN/El. J PVA/v' CIK Patented June 30, 1925.

DNIEL J. RYAN, Ol CLEVELAND, OHIO.

APPARATUS FOR MAKING COB/ES.

Application filed ctober`28, 1922. Serial No. 597,668.

To @ZZ 'Lo/itam it may concern.'

Ee it known that l, DANIEL J. RYAN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in and Relating to Apparat-us forV Making Cores. of which the following is a specification.

My invention relates to apparatus for making cores for molds. More particularly, the invention has reference to a core box struct-ure.,capable of making a single core or a plurality of cores in a ready and economical manner.

r'he present invention is an improvement .ipon the apparatus disclosed and claimed in Patent Number 1,255.46?, granted to me on the th dayv of February, 1918.

lin makingcup shaped articles, such as pistons, according` to the apparatus disclosed in the aforesaid patent, the core box sections parted on diametrical lines extending from the open end ofthe core box to its inner end. This parting left a rib on the core, particularly where it had been in long use due to the wearing' of the abutting walls of the sections. This rib in turn formed a seam or groove in the cast-ing so that if the casting was subjected to strains, for example, that resulting from the engagement of a chuck with the walls of the piston to support it for grinding purposes, the piston would break or crack along this groove. thus indicating that the piston had been Wea-l:- ened thereby,

ihe object of the present invention is to overcome this disadvantage by so shaping the sect-ions of each core box that the parting extends but a relatively short distance inwardly from the open end of the casting and then in other directions.. thereby avoiding` in the casting a groove which extends from end to end thereof andthe weakness would result thereby.

.another object of the invention is to pro- `vide a core box in which may be made in a rapid manner a core the walls of which serve to forni a casting` of great strength and durability. Y

@ther objects of the invention will be apparent to those skilled in the art to which iny invention relates from the following description taken in connection with the accompanying drawings, wherein;

Fig. 1 is a side elevation of a core box structure embodying my invention and a machine constructed to support the core box structure and permit its manipulation, whereby the operations of making the cores and removing them may be facilitated.

Fig. 2 is a fragmentary view of the machine and a sectional viewlof the core box structure when ready` to be filled with green sand or other suitable material which is to he user. to form the cores.

F ig. 3 is a fragmentary top plan, view of the parts shown in Fig. 2, with parts broken away. y i l 4 is a. fragmentary view of the machine and a front elevational view lof the core box structure after it has been filled' with sand and tamped and ready to be inverted for a purpose to be later set forth.

F ig. 5 is a section through the core box structure as shown in Fig. 4, but on the line 5-5 of Fig. 3.

Fig. 6 is a section showing the operation of separating the cores and certain of the core box sections from the main sections of the core boxes.

Fig. 7 is a perspective view of the drag and the cores which have been formed, the core box sections for one core being entirely removedj one section of another core box being removed and the sections for one of the remaining cores being partly separated to show their manner of removal.

Fig. 8 is a fragmentary ton plan View of a core and the subsections of a core box, the sub-sections being partly separated from the core.

F 9 is a side view of the parts shown in Fig. 8.

Fig. 10 is a section on the line 10-l0 of Fig. 8.

Fig. 11 is a section on the line 11-11 of Fig. 3. i

12 is a section on the line`12-12 of Fig. 3.

Fig. 11i is a section on the line 14-14 of F ig. 13.

In the drawings, l indicates a machine adapted to support during the making of a core or cores, a core box structure, indicated as an entirety at 2. The machine l may be of any standard or preferred form and preferably constructed and adapted to facilitate the rapid and economical making of the core or cores. f

rlhe machine l is 'preferably provided with a bed la, which, under the control of a lever l (or other suitable mechanism) may be jolted to properly tamp the sand, as will be later set forth. rIhe bed la may be mounted on trunnions l, whereby the core boxstructure can be rolled over Afor a Vwell known purpose.

ld indicates afvertically movable carrier adapted to support the core or cores, after they have been formed, and to lower them, whereby they will become disengaged from the core box frame or support. The carrier 1d may be operated up and downl by any suitable mechanism. The elevating and lowering mechanism preferably comprises a coil spring le, one end of which is connected to the frame of the machine 1 and its other end connected to the lever mechanism 1i for the carrier ld. The spring l@ is preferably arranged to be placedunder tension when the carrier 1d is moved downwardly by the lever mechanism 1f. The carrier l1 may be actuated manually by means of a foot lever 1g. As a result of this construction, the spring levnormally operates to lift the carrier 1d upon the release ofa lock device which holds the carrierld in its lowermost position. Y Y Y It will be understood that Jhe machine l,

referred to and illustrated hereim in itself,

forms no part of my present invention, but that it simply serves as a suitable support for the core box structure 2 and lends itself to the convenient and rapid operation thereof during the making of the cores. y

The core box structure 2 comprises a core box frame 2a and one part of a flask, 2b, preferably the drag thereof, adapted to be detachably fixed to the core box frame 2d by suitable clamping devices 2. rlhe core box frame 2a is arranged to be fixed to the bed 1a of the machine l in any well known way; it may be detachably fixed thereto in order that it can be removed when desired. The core boxr Vframe la comprises a `plate 2C mounted on top of the frame V2@ and formed with one or more openings 9i" and core box receiving and supporting members 2d (pref-- erably cup shaped), one for each opening 2a. As shown in Figs. 2, 5 and 6, the open ends of the receiving and supporting members '2d register with the openings 2a. By preference, the cup shaped members 2d are flanged, as shown at 2d', and the flanges are secured to the Vunderside of the plate 2 by 4cap screws 2".' The wall for each opening @Mis rabbeted, as shown at 2, to form a seat for flanges on certain of thel core box sections as will be later described.

t". indicates the core boxes, each remov- `with inwardly extended elements, for example, when the casting is a piston, indicated at A, having bosses on its inner walls .-f provide therefor in the core box sections in the following manner: The main section 3a of each core box is cut away as shown in 5a on diametrically opposite sides and each sub-section 3b is provided with an extension 6 shaped to lit the adjacent cut away portion 5a and a laterally projecting member 6a which forms a recess a in the side of the core. The extension 6 isarranged midway between the ends of the adjacent sub-section 3b. As a result of this arrangement, the sub-sections, when being separated from Jhe core (see Figs. 7, 8, 9 and l0), are moved away from each other in a: direction parallel to or in a line coinci dent with the axes of the boss forming re-` cesses a. Fromthe foregoing description it will.' be seen that the partingbetween the core box section extends downwardly from the base of the core a relatively short distance, equal vto the thickness of the subsections 3" and then circumferentially in either direction towards the boss forming recesses, then around these recesses. In the preferred form of construction7 the sutr sections 3b extend inwardly beyond the end wall of the main section 3a as shown at 3V, to form an angular' groove 3 in the core, which groove provides a collarBd in the casting. l3yV this arrangement the parting is effected along the. underside of the collar forming groove and hence eliminates the formation of a rib on the core and the resulting disadvantages that would be inci dentthereto. In practice I have found that by arranging theparting walls of the core box section so thatrthey extend along or concident (l) with the lower ledge of the thickened wall which forms a collar in the casting at or adjacent its outer end and (2) with the line of jointure for the bosses and piston skirt, the formation of a seam or groove in the casting is done away with or eliminated, except at the points where the outer ends of the sub-sections abut, but

as this parting extends onlv a relatively' short distance inwardly from the open end of the casting, the latter is not weakened. ln actual practice. .thc core box frame 2 is provided with one ormore receiving members 2d, each adapted to receive a core box 3 which is capable of forming a core for the largest sized piston or other device which the structure 2 may at any time be called upon to make. By this construction I am enabled to insert in the receiving members 2I core boxes 3 of varying internal sizes to form cores of any desired diameter and shape within the'capacity of the structure.

In the drawings I have illustrated a core box for making a core for a piston casting of relatively small size. In this illustrated form of construction, the main section 3a is provided with a head V which occupies the space between its cap land the bottom or end wall S of the receiving` and supporting member 2d, the head preferably being secured to the end wall 8 by a screw 9.

In the core box frame 2L herein illustrated I have adapted my invention to the making of four cores simultaneously. It will be understood, in this connection, that such frame may be arranged to form a greater or less number of cores. Furthermore, since each corebox 3 is insertible and removable independently of the remaining core boxes, I am enabled to form a plurality of cores of similar size or to make them of different sizes.

10 indicates a suitable shaped pattern, preferably fixed to the frame plate 2c, to form a central metal fing basin and `gates leading therefrom, as will be readily understood by those skilled in the art to which my invention relates.

In operation, the core box frame 2a is arranged in horizontal position with the desired sized core boxes 3 positioned in the receiving members 2d thereof. `The drag 2b is mounted on the frame 2, the pins 2eX on the plate 2c fitting the openings formed in lugs 2b on the drag 2bthus causing the drag to be properly positioned. Green sand is then placed in the core boxes and'drag and tamped inany-well known manner, after which the sand is rleveled and a cover or mold board 11 placed over andv secured to the drag 2b by a member, which forms one element of the clamping devices 2. (See Fig. 4l.) The board 11 may be formed with opening ;sy i2 through which a vent forming pin may be inserted to form vents B (See Fig. 5).' The core box structure 2 is rolled over and the carrier 1d elevated until it engages the*l cover board 11. Upon the release of t-he clamp devices 2d, the' carrier allowed to drop or move downwardly, the

cove-r board 11, drag 2b, and core box sections 3b, with the cores formed within them, moving downwardly from the frame 2c and supporting members 2d with the carrier 1d under the influence of gravity. The core i box sections 3b of eachcore box are then disengaged from the cores by movement laterally away from each other, es by the hands of the molder or in any other suitable manner. In such operation, both sections 3b are preferably moved simultaneously in opposite directions or radially of the axis of the core. If desired, the drag 2b and core boxes 3 with the cores may be transported from the carrier to an auxiliary support or table where the corebox sections can be readily removed. The drag 2b carrying the cores may be placed in position to have the cope (notshown) fastened to it preparatory to pouring.

In the construction herein shown it is desirable to have the core boxes arranged so that upon the disengagement of the cores and sub-sections from the main sections, the sub-sections will be arranged to permit their ready removal or separation. I attain this result by .securing the main sections in fixed relationship, preferably by means indicaterl` at 13, acting supplemental to the screws 9, to secure them to the receiving and supporting members 2d to insure the proper positioning of the sub-sections in the successive operations of .making and removing the cores. The means 13 chosen herein for illustrative purposes comprises dowel pins, each extending through an opening in the end wall S into a recess 14 formed in the adjacent head 7.

lith my invention it is possible to usev green sand in the making of cores and to insure that the cores will be properly positioned in the cope .of a flask without any skill being required on the part of the molder or operative to secure this highly advantageous result. rEhus the labor, equipment, time and expense of baking the cores and later positioning them in the flask is obviated, while on the other hand the green sand can be used over and over for making new cores.

In the construction herein disclosed, it will be seen that I am able to make pistons or piston castings in which walls having seams or grooves formed in them incident to the formation of' ribs on the core resulting from the wear of the abutting walls of the core box sections, are eliminated. As a result, the piston walls are of uniform thickness and may be accurately ground to the desired size without danger of breakage or strain. Furthermore, by the use of my invention I am able to provide cores for use in molds wherein castings having relatively thin walls may be lmade and ground to proper size, thereby producing pistons of relatively light weight and capable of long use. 'Io those skilled in the art of making apparatus of the class described, many'alterations in construction and widely differing embodiments and applications of my invention will' suggest themselves. without drparting from the spirit and scope thereof. i My disclosures and the description herein are purely illustrative, and are not intended to be in any sense limiting.

vVvhat I claini is: y

l. In apparatus of the class described, thev combination of a support vand a core box comprising a main section of tubular shape having a cut away portion kentending iiiwardly from its open end and a sub-section engaging the outer end of said main section and provided with an extension tting said cut away portion and shaped to torni a boss forming recess in the core.v f

2. In apparatus ot' the class described, the combination of a support, and a core box for making cores for cup shaped molds, said box comprising a main section., of tubular shape having cut away portions extending inwardly from its open end and sub-sectioiis eacli provided with an extension, each sub-V section engaging the outer end of the main section and its extension fitting the adjacent cut away portion therein and arranged to form a boss forming recess in the core.

3. In apparatus of the class described, the combination of a support, and a core box for makingv cores of cup shaped molds, said box comprising a main section of tubular shape having cut away portions extending inwardly from its open end 'and subsections each of `semi-annular shape and provided withan extension, each sub-section engaging the outer end of the main section and its extension itting the adjacent cut away por.- tion therein and arranged to Yform a` boss forming recess inthe core.

4L. In apparatus of the class described, the combination ofa support, a core box for making cores tor cup shaped molds,` said box comprising a main section of tubular shape having cutaway portions extendinginwardly from its open end and sub-'sections each provided with an extension, each sub section engaging the outer end of the main section and its extension fitting the adjacent cut away portion therein and arranged toV form a boss forming recess in the core, and means for securing the main section in said support.

5. In apparatus of the class described, the combination of a support, and a sectional core box mountedV therein and arranged to form a core for a cup shaped casting having internal bosses, saidbox comprising a mainv section of'tubular shapeand a pair of semiannular sub-sections engaging the outer circumferential end of' said main section and each provided with an extension to form a boss forming recess in the core, said main section being formed with cut away portions to receive said extensions, whereby the part ing is extendedfrom the abutting ends of( said sub-sectioiis in a direction circumfereiitially of" the core to the boss forming re-f cesses and around the latter along the line j where in the casting the bosses are joined to the wall oi 'the'latteix i (i. ln apparatus of the class described, th

Yconibination of a support comprising a plate` having a plurality ofrabbeted openings and receiving members each associated with one of' said openings, of a plurality of sectional core boxes each engaging the walls of one of said openings and the receiving member associated therewith, each core box comprising a main section or" tubular shape having cut away portions extending inwardly from its outer end and sub-sections engaging said main section and provided with extensions fitting the cut away portions therein.

Y 7. In apparatus ot' the class described, the combination of a support comprising a plate having a plurality of rabbeted openings and receiving members each associated with one of said openings, of a plurality of sectional core boxes each engaging the walls of one of said openings and the receiving member associated therewith, each core box comprising a main section of tubular shape having outy away portions extending inwardly from its outer Vend and sub-sectionsengaging rsaid main section and provided with extensions fitting the cut away portions thereinfsaid sub-sections being separable from said plate, receiving member and main section and movable with the core. j

8. In apparatus of the class described, the combination of a support, and a core box for making cores for cup shaped molds, said box comprising a Vmain section of tubular shape having cut away portions extending inwardly from its open end and subsections separable from said main section and from each other, each subsection engaging the outer end of the main section and provided withV an extension fitting the adjacent cut away portion therein vand arranged to form a boss forming recess in the core. 9. In apparatus of the classdescribed, the combination oi' a support, and a core box for kmaking cores for cup Vshaped molds,

said box comprising a main section of tubular shape having cut away portions extend,

ing inwardly from its open end and sub sections each of semi-annular-shape and pro` vided with an extension, each sub-section engaging the outer end of the main section yand its extension fitting the adjacent cut awayV portion therein and arranged to form a boss forming recess in the core, and portions of each sub-section andits yextension projecting inwardly beyond the wall Vof the main section. y

l0. In apparatus for making cores for piston castings having internal bosses and an internal collar around its open end, the combination of a support, and a core box mounted therein and comprising a pluralityV of separable sections adapted to'jbe assembled in said support and having their abuttingl Walls extending along the inner edge of the groove which forms said collar between the boss iorining recesses and around the latter.

ll. in apparatus Jfor inaling cores for piston castings havingl internal bosses and an internal collar around its open end, the combination of a support, a core box inounted therein and comprising a plurality oi separable sections adapted to be assembled in said support and havingtheir abutting walls extending along` the inner edge of the groove which rorins said collar between the bess forming recesses and around the latter.

l2. In apparatus of the class described, the combination or' a support, a core loonr comprising a inain section oit hollow shape having a cut-aww7 extending inwardly troni its open end and a sub-section engaging the outer end of said inain section and havingl an extension corresponding in shape to and iitting said cut-away, anda member extending laterally from the inner end of said extension.

i3. in apparatus of the class described, the combination or' a support, and a core bei; inounted therein, said box con'iprising` an inner, hollow non-sectional portion havingl a eut-away extending inwardly from its outer end and an outer portion comprising separable sections one oi which has an extension correspondingl in shape to and {itting' said out-away.

4. in apparatus of the class described, the combination oi a support, and a core box mounted therein, said box comprising` an inner, hollow nonsectional portion haringl eut-aways extending inwardl)7 from its outer end and an outer portion comprising separable sections each having between its side edges an extension corresponding in shape to one of said cut-aways anc fitting therein.

in testimony whereof I have hereunto subscribed my naine.

DANIEL J. RYAN.

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