US1727343A - Mold and core - Google Patents

Description

M. GUYOT MOLD AND CORE Sept. .10; 1929.

Original Filed Jan. 30, 1926 ZShefls-Sheet 1 INVENTOR %W AT RNEYS Sept.- 10, 1929.

M. 'GUYOT MOLD AND CORE Original Filed Jan. 30, 1926 2 Sheets-Sheet 2 INyENTOR 22 A ORNEYS Patented Sept. 10, 1929 16mm ST macros savor, or CLEVELAND, oH Io,

ATES

ASSIGNOR TO ALUMINUM COMPANY OF AMERICA, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MOLD AND' CORE.

applicatiou'filed January 30, 1926, Serial No. 84,846. Renewed July 1, 1929.

This invention relates to multipart metal molds for casting high melting point metals.

It also relates to metal molds for casting articles comprising-spaced, telescoping walls joined together by an end wall andby lateral- .webs spaced apart from the end 'wall. It further relates to a permanent mold cast, aluminum alloy, cylinder head for an inso far as I am aware, although metals such as aluminum alloys possessed properties desir-able for such articles. Attempts to make such parts of aluminum'alloys by casting in sand Orsemi-permanent molds have not been commercially, successful due, among other causes, to porosity in the castings through which water used for cooling could enter the combustion chamber. By this invention, however, sound, non-porous, commercially satisfactory cylinder head castings can be made. Furthermore, this invention also makes possible the casting of hollow articles comprising telescoping spaced walls joined together by an end wall and by lateral webs spaced apart from the end wall.

In the drawings attached to and forming a part of this specification:

Fig. 1.- is a top plan view of an assembled.

mold embodying my invention;

Fig. 2 is a Ion 'tudinal view, partly in'elevation and part y in section, taken substantially on line 2-2 ofFig. 1;

Fig. 3 is a transversesectional view-taken on line 3.3of Fig. 1; I Fig. is a side elevation of a core embodying my invention and shown in Figs. 1 to 3; Fig. 5 is a top plan view of the core with certain sections being removed; and

Figs. 6, 7 and 8am horizontal taken on lines 66, T-.7 and 88 of Fig. 4,

' respectively.

In the drawin s, 1 designatesa mold basemounted on the top' sur-' vare pivoted together by an upright pin 3 extending into a perforation in the base 1.

Two' other similarly shaped mold halves 4 sections are superposed on the first pair of mold halves and also pivoted together by the pin. The inner or con'tacting'surfaces of the mold halves 2 are suitably recessed to form gate,

feeder and casting cavities 5, 6 and 7, respectively, therebetween, in which articles of the desired configuration may be cast. The mold halves 2 are positioned, with respect to the. base, by a: pilot 8 projecting above the t? surface of the base and seating in correspon mg recesses 8. in the mold'halves 2.. This p lot may be integral with the base but, as shown, is formed separately so that the same may be replaced by other pilots wheneverit is desired to employ the base for making different castings. The top surface of the pilot may conveniently. serve as an end wall for the casting cavity, and may include-the use of an insert 9 of special shape. The insert 9 shown consists of a member seated and securelylield inthe pilot and-having a top surface 9 shaped to form the end wall of the desired casting. The mold, herein shown,-is constructed to form an outstanding flange 10 on the endless attached to the mold halves. The upper or superposed mold halves 4, which seat on the lower mold halves and filler plates have surfaces formed to. receive the filler plates 12. It will be-understood that when the mold halves are moved into engagement with each other they may be secured together at their-free ends, as by the clamping bar 13 and hook 14;. A multipart coreis carried by the superposed mold halves and clamped together and held in position by the latter, when the clamping bar and book are in assembled position. This core projects into the casting cavity and forms inner walls therefor against which the molten metal may be cast. The

core shown herein consists of a central, cylindrical section 16 having a reduced extension 17 at its free end, which projects into a correspondingly shaped perforation in the member 9 carried by the pilot. Surrounding the central cylindrical section. 16 are disposed a pluralityof outer sections engaging therewith and with each other and having freev ends which extend into the casting cavity but stop short of the member 9 and the pilot 8,

. and are spaced apart from the cylindrical section-and from the mold halves; These outer core sections cooperate with each other to form an endless hollow tubular walli It will be understood that the central section need not necessarily be cylindrical nor extend into contact with the bottom .wall of the casting cavity. It will also be understood that the outer core sections -may beshaped to provide walls which are not necessarily endless or circular and that they. form tubular walls of variouscross sectional conlarge section 23. The small sections 22 which are arranged in pairs are relatively narrow and have theirvmeeting faces 22 cut away to form the cross webs 21 on the casting. Each section has an outstanding flange 22 on its outer end to support the section from the top of the mold halves. The large section 23 is tubular in form with an outstanding flange 23 at its outer end to rest on the mold halves. It is provided with grooves 23 to receive the pairs of smaller sections 22,

which grooves extend entirely through the section '23 near its lower end (see Fig. 6) thereby forming openings-through which en- 'largcd portions of sections 22 project to form the outer wall for the part 18 of casting 11. The free ends of all the sections 22; and 23 are preferably aligned as shown whenassembled with the mold.

For the purpose of'rendering easy the re moval of sections 22 from a casting, they are provided with draft so as to be separable from each other in the casting. Although the amount of inclination of the substantially parallel outer and inner surfaces necessary for such draft may be small, it has i been indicated as large in Fig. 6 for the sake of clcarness. That figure shows the sections 22 each havin convergingly inclined outer and inner surfaces 22 and 22?, respectively,

below the web recess 22. Additional similar core parts 24 are disposed on opposite sides of the main core to form certain walls of the cavity in which the flange 10 is cast. Each part 24 seats in a see I suitably shaped recess in the mold halves; and is provided at its outer end with a supportingflange 24 and a'handle 24?. Eachpart 24 partly supports the flanges .22". of a A core constructed as above descrrbed,'maypair of sections 22.]

be easily removed from its casting by, first loosening the clamp. 13 on the mold halves and then removing the central section 1.6.

Then-the larger outer section 23 caIibe-removed by lifting it vertically out ofthe'casting, after which the pairs of narrow sections 22 may be removedfby. pivoting each section about its inner corner 22 as is permitted by the draft at the surfaces 22 and 22 and at the same time sliding the sections around the casting between the parallel walls until the sections clear the web 21, after which the sections are lifted vertically out of the'cast-r ing. Such movements free the sections 22' from the cross webs 21 and the end wall of the: casting, and permit-their unobstructed removal from the casting. Then core parts 24: may be removed and vthe moldj halves moved apart to tree the casting. J It will be understood by those skilledin the art, that the various-partsshown and described in detail hereinabove,- have been .given'for the purpose]; of enablingothers to,

practice my inventio'njand not for zthepu'rpose of limiting the invention-thereto. -Va'-' rious changes, not amounting -toinvention',.

may accordingly be inade in theforegoing details without departing from the spirit of my invention. The scope of my invention is defined in what is claimed.-

'W'hat-is claimed is: p p 1 1. A mold for casting a metal article which comprises a mold base, mold halves slidably. carried thereon and having their adjacent inner faces suitably recessed to form gate, riser and castingcavities for the said article, and a sectional metal core supportedby the mold halves ,to project-into and form'inner .walls of the casting cavity, the said core including a plurality of sections to formthe space between. the said 7 inner and outer. walls of the casting, one of the said sections being. circular-and cut away to receive pairs of sections, and other sections being arranged in pairs and-disposed A in the said circular section, each pair of sections being recessed to form therebetwe'en lateral webs connecting the innerand outer walls and spaced apart from. theend-wall'.

2. A mold for castin metals which comprises a mold base, mold halves slidably car-' ried thereon and having their adjacent inner faces suitably recessed to form gate, riser and casting cavities for the article to' 'be cast, and a sectional metal core supported by-the mold halves to project into and form inner walls of the casting cavity, the-said core including a plurality of cooperating sections forming an endless. wall spaced i said article,

core encompassed by said series of sections and spaced therefrom throughout part of its outer surface to form another part of the mold cavity.

In testimony whereof I hereunto aflix my signature this 23rd day of January, 1926.

MARIUS GUYOT.

-3. A moldfor casting metals which comprises a mold base, mold halves slidably carried thereon and having their adjacent inner faces suitably recessed to form ate, riser and casting cavities for the art1cle to be cast, and a sectional metal core supported by the mold halves to project into and form inner walls of the casting cavity, the said core including a plurality of cooperating sections formin an endless wall spaced apart from the side and bottom walls of the casting cavity, the said sections consisting of a section having wide, circumferent-ially extended, oppositely disposed free endportions, and narrow sections arranged in pairs engaging the side edges of the said ortions, each pair of sections being provlded with a recess therethrough at the parting line and remote from the free end thereof, and a central section withinthe endless wall forming sections and spaced apart from the free ends thereof.

4. A mold for casting a metal article which comprises a mold base, mold halves slidably carried thereon and having their adjacent inner faces suitably recessed} to form gate, riser and casting cavities for the and a sectional metal core supported by the mold halves to project into and form inner walls of the casting cavity, the said coreincluding a plurality of sec tions to form the space between the said inner and outer walls of the casting, one of the said sections being circular and cut away to reciive pairs of sections, and other sections bei g arranged in pairs and disposed in the said circular section, each pair of sections being recessed to form therebetween lateral webs connecting the inner and outer walls and spaced apart from the end wall, each pair of sectionshaving inner and outer casting engaging side surfaces in-' clined convergingly toward their meeting edges,

5. A mold for casting metals which comprises outer mold sections, a series of core sections in contact with and supported by said mold sections, and an inner core encompassed and supported by said series of sections.

6. A mold for casting metals which comprises outer mold sections, a series of core sections in contact with said core sections throughout part of their outer surface and spaced therefrom for the remainder thereof to form part of a mold cavity, and an inner

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