US1709249A - Apparatus for making castings - Google Patents

Description

April 16, 1929.

J. J. DIMEO I APPARATUS FOR MAKING CASTINGS Original Filed Sept. 11, 1926 4 Sheets-Sheet l INVENTOR YJ; J. Diflteo- ATTORNEY Original Filed Sept. 11, 1926 4 Sheets-Sheet INVENTOR wiw hc ATTORNEY April 16, 1929. .1. J. DIMEO APPARATUS FOR MAKING CASTINGS Original Filed Sept. 11, 1926 4 Sheets-Sheet 5 HNVENTOR J1 J1 BY gm 3" 13k: 07

ATTORNEY April 16, 1929.

J. J. DIMEO APPARATUS FOR MAKING CASTINGS Original Filed Sept. 1926 4 Sheets-Sheet ENVENTOR J.J. D,i meo- ATTORNEY Patented Apr. 16, 1929.

UNITED STATES PATENT ()FFlC-E.

JAMES J. DIMEO, OF CLEVELAND, OHIO ASSIfGNOR TO .THE PERMOLD COMPANY, or

CLEVELAND, OHIO, A CORPORATION OF OHIO.

APPARATUS FOR 'MAKING CASTING-S.

Application filed September 11, 1926, 'serlal No. 134,895. Renewed September 6, 1928.

This invention relates to a method and apparatus for forming castings, particularly hollow cup shaped castings, of aluminum or an aluminum alloy.

An object of the invention is to provide a mold by which the casting is formed with its sprue upon the tubular skirt portion of the casting instead of upon the top portion thereof, so that the trimming and finishing of the casting is facilitated particularly when the top is apertured or of otherwise irregular contour.

,A further ob' ct is to form a casting with the excess metal in the form of a sprue or of a sprueand riser joined to the metal of the casting by straight narrow webs, so that the excess metal can be quickly and easily trimmed olf.

A further object is to provide a permanent sectional mold in which the core members and outer mold sections can be quickly and easily separated to free a castin With the above and other objects in View, the invention may be said to comprise the apparatus as illustrated in the accompanying drawings hereinafter described and particularly set forth in the appended claims, together with such variations and modifications thereof as will be apparent to one skilled in the art to which the invention appertains.

Reference should be had to the accompanying drawings forming 1' a part of this specification in which:

Figure 1 is a top plan view of a mold embodying the invention showing the sections in closed position.

Fig. 2 is a front elevation of the mold showing the sections in open position and a casting in the position in which it has been formed in the mold. 4 Fig. 3 is a central vertical longitudinal section through the mold taken on the line indicated at 3-3 in Fig. 1.

Fig. 4 is a central vertical transverse section through the mold taken on the line indicated at 47-4: in Fig. 1.

Fig. 5 is a top plan view of a casting formed in the mold.

Fig. 6 is a side elevation of the casting.

Where acup shaped casting is to be formed with one or more apertures in the top, the mold must be cored to provide the apertures in which case it is difiicult, if not impossible, to provide a gate opening into the bottom forming portion of the mold cavity from that the riser also is connected to which the molten metal can be properly distributed throughout the mold cavity. Furthermore, the trimming of the sprue from the bottom of a casting which is apertured or otherwise irregular in contour is a more difficult and expensive operation.

'I he present invention provides a mold by which allthe excess metal in the sprue and n the riser is joined to portions of the casting which are continuous and of regular contour, so that the casting can be easily and quickly trimmed. This result is accomplished by introducing the molten metal into the skirt forming portion of the mold cavity through a straight narrow elongated opening or gate cavity, whereby the sprue is joined to the body of the casting by a straight narrow web. If ariser forming cavity is provided in the mold, this cavity also communicates with the skirt forming portion of the cavity through anarrow opening or gate cavity, so the body of the casting by a narrow web.

The casting is preferably formed in'a mold which has the bottom forming portion uppermost and has a sprue cavity which ex tends well above the top of the casting cavity and which has a long narrow vertical gate opening into the substantially vertical skirt forming portion of the casting cavity which extends from adjacent the upper end of the cavity toward the bottom. If a riser cavity is provided, it is preferably positioned diametrically opposite the gate and extends above the top of the casting cavity, the riserv able core member and separable sections suitably recessed to fit around the core and form the casting sprue and riser cavities and also the gate cavities.

' The mold is mounted upon a suitable bed or base member 1 which hasa central aperture in which thereis fixed a vertical sleeve 2, in which is slidably mounted a core member 3 movable upwardly into molding position and in the upper end of which is mounted a central core pin 4 which projects above the upper end of the main core member 3 to cotit? operate with sleeve 20 to form a central aperture in the casting. The core member 3 may also be provided at the top thereof with integral projections 5 which serve to form additional apertures in the top portion of the casting between the center and periphery thereof. The core member 3 is preferably provided with means by which it may be forcibly withdrawn from a casting and to this end a rack bar 6 is attached to the lower end thereof, and this rack bar is engaged by a pinion 7 on a shaft 8 to the outer end of which is attached a handle 9, by means of which the shaft may be turned to raise or lower the core member upwardlyinto molding position within the casting cavity or to remove said core member downwardly and out of the casting cavity.

The outer shell of the mold is formed by two separable sections 10 and 11 which are recessed to accommodate the core member 3 between them and form the downwardly opening cup-shaped casting cavity around the core member. The sections 10 and 11 are connected by extensible links 12 with arms 13 fixed to transverse shafts 14 at each end of the base or supporting member 1 rearwardly of the mold sections 16 and 17, each link 12 being shown ascomprising rotatably adjustable link members oppositely threaded at their ends and each connecting aligned, apertured and threaded bifurcated members pivotally secured respectively to an arm 13 and a lug extending from a mold section toward one of the arms 13, the nuts directly adjacent those bifurcated members secured to the arms 13 serving to retain the link members in desired adjusted position, and nuts midway of the link members providing convenient means for rotatably adjusting said link members. Each of the shafts 14 is provided with a handle 15 by which it may be turned to shift the mold sections to and from operative position. The links 12 and arms 13 form toggles which are straight when the sections are in operative position in engagement with each other and which serve to hold the sections together under pressure.

The upper portions of the sections 10 and 11 are preferably formed of separate blocks 16 and 17 connected to the body portions of the sections by bolts 18. The inner faces of the blocks are in the planes of the inner faces of the body portions of the sections, and the block 16 has fixed thereto a vertically disposed collar 19 which is slidably mounted an auxiliary recessed core member or sleeve 20 which is movable downwardly and adapted to receive the upper end of the core pin 4 and thus cooperate with the core 3 to provide an axial aperture in the casting. Fonlifting the sleeve 20 to free the section 10 from the core member, the rack teeth 21- are formed on the outer side thereof, and these teeth are engaged by a pinion 22 formed in a shaft 23 journaled in the block 16 and provided with a handle 24. by which it may be turned to raise or lower the sleeve upwardly out of, or downwardly into, co-' the collar 19 when the sections are brought together.

As shown in Figs. 5 and 6, the casting formed in the mold has a cylindrical skirt portion 26 and a top portion 27 which has a central opening 28 surrounded by a countersunk portion 29 and other openings 30 around the central openings. formed at the lower end of the skirt portion, and the upper portion of the casting maybe reinforced by the oppositely disposed integral internal webs or bosses 32. A sprue 33 is joined at its lower end to the skirt portion 26 by a straight narrow elongated web 3 1, which extends from the upper end of the skirt toward the bottom in a directionparallel with the axis of the casting. A riser 35 diametrically oppositethe sprue 33 is joined at its lower end to the skirt portion 26 at the upper end thereof by a narrow web 36 parallel with the web 34 which is shown as but considerably shorter than the web 3 1.

The mold sections 10 and 11 are identical except for the fact that the collar 19 and auxiliary core member or sleeve 20 are carried by the section 10. When in engagement the sections 10 and 11 abut in a vertical plane including the axis of the core member 3, and are provided with complemental recesses corresponding to halves of the casting on opposite sides of an axial plane passing centrally through. the sprue and riser. The opposed faces of the sections, therefore, have recesses, each corresponding to one half of the casting cavity, and on opposite sides of these recesses other recesses corresponding to one half of the sprue and one half of the riser cavity, the deeper portions of the gate and riser recesses being connected to the mold cavity forming recesses by 'wide shallow grooves which are substantially vertical in longitudinal extent and which, when brought together form the long, narrow gate cavities opening from the gate and riser cavity into substan tially vertical portions of the mold cavity. The sections 10 and 11 have shouldered pen tions 37 which fit over the upper end of the sleeve 2. The shoulder 37 may be spaced above the top of the sleeve 2 to form the flange 31 of the casting. W hen the mold is assen'ibled for casting, the sleeve 20 projects slightly into the casting cavity to form the countersunk portion 29, and the projections 5 of the core member engage the sections 10 and 11 of the top of the casting cavity.

To position the parts of the mold for easting, the core member 3 is raised to its upper- A flange 31 may be most position by turning the handle 9, the sections 10 and 11 are brought together by turning the handles 15, and the sleeve 20 is lowered onto the pin 4 by turning the handle 24. The molten metal is poured into the sprue cavity and flows through the gate cavity to all parts of the casting cavity uniformly to form sound castings and vinto the riser cavity, air being thus permitted readily to escape from the casting cavity. The metal of the casting shrinks during cooling and draws additional metal both from the sprue and from the riser, molten metal being thus provided to feed the boss portions. After the casting has hardened sufficiently, the sleeve 20 is raised clear of the casting, the sections 10 and 11 are moved away from the casting and the core member 3 is lowered out of the casting, after which the casting can be taken away.

It will be noted that the toggle means shown in the drawings for moving the mold sections into and maintaining the mold sections in molding position are simple and efficient. Moreover, by reason of the links 12 being in horizontal position when the mold is closed, the mold sections are positively locked in, molding position. The extensibility of the links 12 furthermore provides a means of adjustment whereby the mold sections may always be brought into desired closely engaging position although warpage or expansion of the mold sections, for example, has taken place.

It will also be seen that I have provided an advantageous structure for forming axial apertures in. a cup-shaped casting. Thus, the recessed auxiliary core member 20 carried by the mold section 10 is arranged to be moved downwardly to receive the upwardly extending core pin 4 carried by the core 3.

Furthermore, it is to be understood that the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and illustration and that various modifications of said apparatus and procedure can be made without departing from my invention as defined in the appended claims.

ll liat. I claim is:

1. In a permanent mold adapted for easting substantially cup-shaped articles from aluminum alloys and the like, in combination, a support, a plurality of separable mold sections, means for guiding said mold sections into and out of molding position on said support, said mold sections having complemental recesses in their inner faces forming a substantially cup-shaped casting cavity opening downwardly, a permanent core arranged to be moved upwardly into molding position within said casting cavity and to be withdrawn downwardly therefrom, and an auxiliary core member carried by one of said mold sections and movable downwardly into cotions, means for guiding said mold sections into and out of molding position-on said support, said mold sections having complemental recesses 1n their inner faces forming a substantially cup-shaped casting cavity opening downwardly and a sprue cavity and a relatively narrow gate intermediate and communicating with said sprue and casting cavities, a permanent core arranged to be moved upwardly into molding position within said casting cavity and to be withdrawn clownwardly therefrom, said core carrying a core pin extending upwardly therefrom, an auxiliary recessed core member carried by one of said mold sections and movable downwardly to receive said core pin whereby an axial aperture may be formed in the casting.

3. In a permanent mold, in combination, a support, a mold section carried by said support, and means for moving said mold section into desired position relative to another mold section, said means comprising a rotatable shaft carried by said support and disposed rearwardly of said mold. section and transversely of the direction of movement thereof, a pair of spaced arms carried by said shaft, a pair of spaced lugs carried by said mold section each extending toward said transverse shaft in substantial alignment with one of said arms, bifurcated members pivotally secured to each said lug and arm, each bifurcated member having a longitudinal aperture threaded to cooperate with a link member, link members each oppositely threaded at its ends and connecting aligned bifurcated members secured to a lug and an arm, means whereby said link members may be rotatably adjusted, means for retaining said link members in desired. adjusted posi tion, and means for rotating the transverse shaft to move said mold section.

4. in a permanent mold for casting substantially cup-shaped articles from aluminum alloys and the like, a plurality of recessed separable mold sections, a permanent core arranged to be moved upwardly into molding position, said mold sections and core together defining a substantially cup-shaped casting cavity opening downwardly and arranged to form an aperture in the upper end of the casting, said mold sections being recessed to form a sprue cavity and a risercavity, and relatively narrow gatecavities intermediate and communicating with said casting cavity and said respective sprue and riser cavities, said sprue cavity extending well above the top of said casting cavity, said sprue and riser cavities being disposed at substantially opposite sides of said casting cavity, said gate cavities being substantially vertical in longitudinal extent and arranged to communicate with said casting cavity at substantially ver- 5 tically disposed portions thereof, whereby said casting cavity may be readily filled comrespectively and with said casting cavity adj'acent said boss portions, said gate cavities being substantially vertical in longitudinal exte'nt and arranged to communicate with said'casting cavity at substantially vertically disposed portions thereof, whereby the in- Patent No. t, 7%,

JAMES r.

coming molten casting metal may fill the casting cavity readily and uniformly and whereby molten metal may be provided to feed said boss portions. v

6. In a permanent mold for casting substantially cup-shaped articles from aluminum alloys and the like, a plurality of recessed separable mold sections, a core arranged to be disposed intermediate said mold sections, said moldsections and core together defining a hollow substantially cup-shaped casting cavity opening downwardly, said mold sections being recessed to form a sprue cavity and a relatively narrow gate cavity communicating with said sprue and casting cavities, said gate cavity being substantially vertical in longitudinal extent and arranged to communicate with said casting cavity at a'substantially Vertically disposed portion thereof whereby the incoming molten casting metal may fill the casting cavity readily and uniformly, and whereby air within the casting cavity may readily escape therefrom.

In testimony whereof I atfix my signature.

JAMES J. DIMEO.

(C(WRRECTHQN.

(Granted Aprit it, 192 to it is hereby certified that error appears in the printed 's ie citieatioa at tine vailitive numbered patent requiring correction as tolliowsz Page ihllinee 5t, 59 tit, for the were! "tottein" read ."tep"; and that the said Letters Patent sheiilid he read with these eerree'tioiie therein that the same may ceaiorai to the record et the ease in the Patent thrice.

' figured and seated this 28th day at May, A. t). 1929.

(steal!) it. a rte-m, Acting @eriiriissieiier eii tateritc.

CERTIFICATE OF CORRECTION.

Patent No. 1,709,249. Granted April 16, 1929, to

JAMES J. DIMEO.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, lines 54, 59 and 80, for the word "bottom" read "top"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 28th day of May, A. D. 1929.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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