US1034336A - Method and apparatus for making molds and cores. - Google Patents

Description

. a. crBANNIsT-ER; METHOD OF AND APBARATUS FOR MAKING HOLDS jAND GOBB8.-

Patented 'July 30, 1912.;

APPLICATION FILED JAN. 11, 1912.-

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WITNESSES .l; 'NVENTOR J. uawmsprnR. METHOD OF AND APPARATUS FOR MAKING HOLDS AND COR BS.

Patented July 30, 1912..

- APPLICATION FILED IA]. 11, 1912.

3 SHEETS-BHEET 3.

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. INVENTOR STATES :PATENT OFFICE fa'onn oqnaumsrnaor KEWANEE, rumors.

. Inn-ion or AND APrARATUs FOR MAKING MOLDS AND cones} Specification of Letters-Patent.

Application filed January 11, 1912. Serial ms; 670,631.

To all whom it may concern." Be it knownthat I, Jorm O'Baumsrei'z,

a citizen of. the United States, residing at Kewanee, in, the countyof Henry andState of Illinois, have'invented a new and useful 'Method of and. Apparatus for Making Molds and Cores,-of which the following is aspecification.

My vinvention relates to making green sand cores and half molds which are laterv assembled in making a complete mold, and employed to manufacture metal castings;

I and the invention more particularlyrelates formed through the medium .of fluid presto making such cores or half-molds or molds in multiple within core boxes and flask sections in'readiness for the flask to be booked or assembled and the cores transferred thereto preparatory to the later casting operation. 7 a

It has heretofore been proposed to make half-molds by delivering the sand into the flask section in which the mold is being sure-suchas compressed air. In such apparatus, a quantity of sand is placed within the sand boot and is then forced. or caused to pass downwardly through openings or "holes located in the bottom of the sand boot into the flask section or sections, thebest known form of such apparatus being that covered by the Hewlett Patents Nos. 808,367, 819,883, and 823,530. With such apparatus,

. thesand which is placed in bulk in the sand quently cuts channels or passages through the body of sand through which the air travels and when formed such passages or channels lessen the flow of sand into the mold or half-mold to an extent which appreciably adds to the time required'to fill the mold with sand. The formation of such chan- 45' nels or passages in the; bodyof the sand within the boot rendersit necessary to interrupt the mold. forming operations inorder to permit the sand within the boot; to :be stirred or shaken up so .as to destroy the openings'or channels. a

One objectof my'invent-ion is to provide a novel methodof'handling and delivering the sand from thesandboot into the flask green sand cores and heretofore in use are prevented and overcome. I

Still further objects of the invention will be disclosed as the invention is more fully describedhereinafter. s

Referring to the accompanying drawings forming part of-this specification, Figure 1 is a side elevation showing one form of apparatus constructed and arranged, in accordance with my invention and adapted for use in carrying out the method of making cores, half-molds .and molds forming part of the. invention. Fig. 2 is an end elevation of the apparatus shown in Fig. 1. Fig. 3' is aside elevation showing a modified form of apparatus also adapted foruse in carrying 'out the method forming part of this invention. Fig. 4% is an end elevation of the apparatus shown in Fig. 3. Fig. 5 is a detail sectional elevation of the apparatus of Figs. 1 and 2 on a. larger scale, showing the arrangement of the flask sections and core boxes, as applied to the sand boot. Fig.

a multiple ha]f-mold.

In the drawings, in which pipe fittmgs P'atentedJulyE-it), 1912. j V

'paratus shown in Figs. 1, 2, and 5 in making known as Ts are shown being made, and referring to Figs. 1, 2 and 5 the numeral 2 designates a'sand boot havinglegs or feet 3 by which the apparatus is mounted upon a. suitablefoundation or like support. Brackets 4' are provided on the sides of the sand boot 2 to which the lower ends of the vert1- cally extending standards or uprights '5 are secured, and mounted on the upper ends of the uprights 5 is a support 6 on Whlch the vertical fluid pressure cylinder 7 isinountratus the sand boot-'2' is provided with legs or feet 3', and has a'supplypipe 19 con necting the single compartment 16 -of the sand boot, through its bottom, with the source of compressed air orother fluid pressure used in forcing the sand therefrom into the core box formed of the half core boxes 27 and 28,. A bottom platen or table 21' is mounted on the open upper end of the sand boot and the rectangular'opening 21 in this platen 21" israbbeted so as to position the blow plug plates 31" seated therein during the core forming operations." Brackets 4 on the ends of the boot 2. provide supports for the uprights or'standards '0 which in turn secure the cylinder support- 6 on their upper ends and the cylinder 7 carried thereby in the same manner as has been heretofore described. The cylinder 7, which extendsvertically lengthwise, has a piston 10 on one end of a piston rod 9 which projects downwardly through the stufling box and gland 8. on the lower end of the cylinder. The outer end of the piston rod 9 is connected to the top platen or table 11, as before described, and this top platen 11' has grooves or notches 12 in its marginal edges which engage with the uprights 5' and form guides for the platen 11 when the platen is raised and lowered during the core forming operations. The top and bottom platens are connected by bolts 24' tolift the lower platen 21 from the boot 2' and afford means for placing sand in quantities Within the sand bootin preparation for the core forming operations. Hook bolts 25" are also provided to lift the core boxes sufficiently to clear the blow plugs 29 and 30' extending upwardly into the core box through the openings provided for that purpose in the bottom section29 of the two half boxes 27 28, forming the complete core box. A shelf 38, or arms forming a shelf, is also provided on the side of this sand-boot 2 as before. Suitable valves are located on the supply pipes 18, 19, 20, leading to the compartments of the sand'boot 2 and pipe 19 leading to the sand boot 2 and a four Way valve is employed in the pipes connecting the lifting cylinder 7 or 7 with a fluid pressure supply to regulate and control the entrance of fluid pressure to the sand boot 2 or 2'v and to the lifting cylinder 7 or 7. i

In using the apparatus of Figs. 1,2 and 5 for carrying out thesteps of my improved method, to simultaneously form a series of half-molds and the cores therefor in inultiple, the compartments 15, 1G and 17 "of the sand boot 2 are provided with .aisupplyi \of molding sand, the operating icylinder' l' b'e-I', ing caused to lift the bottom platen. 211st, as"t-provide-an opening 1n the sand boot through which the sand is plac'edin the compartments thereof. The middle compart'ment 16" which supplies the used I in making the cores may contain sand differ ing in composition from that'in theother two compartments in the sand boot when found necessary .or desirable. t

The valve controlling the operation of the lifting cylinder is thenmanipulated to lower the platen 21 into position on top of the sand boot 2. The flask sections 36 in which the half-molds are formed are then positioned as shown: in these figures, and a core box is placed in position on the blow plug plate 31, the blow plugs 29 and extending upwardly through the registering openings in the bottom half 27 of the core box, so that the side outlets 29 and 30? in the blow plugs 29 and 30 as well as in. the

plugs 29, 30 adjacentto the closed upper ends of the blow plugs, are positioned with v in the core boxes opposite the openjen'ds of the core forming cavities withinfthe core boxes' The top platen 11 is then'jlowe'red into engagement with the top's'urface'stof the flask sections 36 and the tophalf 28 of- 7 in order to hold the flask sections and core boxes in place between the platens 11 and 21. This movement of the platen 11 also brings the half patterns supported thereon into position within the flask sections to form the cavities in the half-molds. Air or other fluid pressure used in deliver ing sand from thesand boot into the core box and the flask sections, is then admitted to the compartments 15, 16, and17 of the saudboot,by opening the valves controlling.

the fluid pressure supply pipes 18, 19 and 20.' The fluid pressure, asitenters the compartments ofthe sand boot 2, rises there in'and passing through the body of sand enters through the holes 31' into theflask sections 36 and through the blow plugs ltlv and 30 into the core box, and emerges thercjfrom through the joints between the platens and the edges of the flask sections and vents in the flask sections, and through the joints between the half boxes 27, 28 of the core box. Care is taken to avoid making these joints ,so tight as to prevent escape of the fluid pressureat the necessary rate and if necessary, added means may be provi fled' to facilitate such escape from the flask sec tions into the atmosphere. ;,-The fluid pres- 'sure passing from the sand boot will carry or force the sand to travel therewith'and become ClCPOSIl'Gd in the flask SECUUHS ZIHd 1 core box, the sand gradually filling thleflask sections and cavities in the coreubox and'y becoming equally packed'therein in such manner as to be uniformly dense, ti n-ou-jz'hv out the body of the so-formed half-molds and cores. The fluid pressurein passing '30 sections are provided with the usual compleupwardly through the-sand bo'ot'constantly ears or agitates the body of sand contained therein, so as to entirely prevent the forma tion of passages or channels thereinand the the flask sections and the core box become filled with sand, fluid pressure is shut jofl from" the sand boot 2. The cylinder 7 is then caused to lift the platen 11, thereby removing the half-molds 35 attached .to the lower surfacethereof from the flask 'sectlOHS and at the same timeli ftingzthe core box, by means of the hook bolts 25 which engage with the lugs 26 on the core box so as to clear the upper ends of the blowplugs 29 and 30. The flask sections 36 are then removed from between the then separated platens Y11 and 9.1, and the core box is removed from the hooks 25- on .the bolts 25 from which the core box is now suspended. The flask sections andcorebox containing the formed cores andhalf-molds'are then removed from the molding apparatus. The top half 28 of the core box is then lifted so as to uncover the series of' nultiple cores therein,-a'nd one flasksection 36 is rolled or turned over and is placed ontop of the" bottom section 27 of the core box containing the cores. The flask sections andcore box ment. of dowel pins and registering holes or openings so as to insure proper registration with each other oft-he series of half molds formed in each. flask section and the cores-in the core box. The half core box and half-mold placed thereon are then turned together so as to bring the bottom half of. thefeore box uppermost.

Thishalf box is then removed, thereby uncovering the cores which are now accurately positioned in the half molds formed in the flask section. The second flask section is'then placedin positionon top of the other flask section and with this operation the complete mold, with the cores in positlontherem, is assembled, or. in the'vernacular of the foundry, 1S

booked. The 'sprue or runner if'not already formed in making the mold, is then formed and the .mold ventedin the usual manner, when the mold is in readiness for the casting operation, in which the molten metal is poured into the cavities of the mold and the castings thereby formed.

It will be readily seen by those skilled in the artthat the above described-apparatus and method can lie-employed to advantage in making a mold, or mold and core, later used in forming a single casting, instead-0f simultaneously forming, the plurality of molds, as before described. 7

\Vith the-apparatus shown in Figs. 3, 4 and .6,,the core forming operations are the same as hereinbefore describedfor making.

cores with the apparatus of Figs. 1,2 and 5,

the difi'erencebeing that cores alone are formed which are later carried to a place of use'where they are transferred to a mold whichhas been formed independently ofthe core forming operations, and which may be either machine or hand molded. 1

The advantages of my invention will be apparent to those skilled in the art. The J sand is placed within the sand boot in bulk and is' then deliyere'd into the flask sections and :the core boxes as required. The sand is caused to become uniformly packed there- .in and form' r'nolds and cores of uniform den'slty, the formation of defective molds and cores thereby being lessened and prevented to a large extent. By causing the 1 sand to flow upwardly into the bottom of the flask sections,'. instead of as heretofore discharging the sand downwardly from the sand boot, packing of the sand in the sand bootso as to. in effect lessen the capacity of the sand boot is effectually prevented,

and the formation of passages or channels through the body of sand and leading to each -of the outlet openings into the flasks .and core box is avoided.

Modifications in the construction and arrangement of the parts may be made without departing from my invention. The apparatus may be employed for use in making a single mold or a single core instead of making molds or cores in multiple, as shown. A single half-mold may be made instead of simultaneously forming two half-molds and the cores, as illustrated in the drawings. The apparatus of Figs. at and 6 may be emplcyedin making half-molds instead of cores as shown, and other changes in the construction and arrangement of the apparatus 'may be made without departing from my invention as defined in the claims.

- -i\lodifications in the apparatus shown and the methods described herein for making cores and molds, are claimed in my co-pending applications, Serial No. (359,159, for method of .and apparatus for making sand molds. filed November 8, 1911, and Serial No.

- container, and causing the fluid pressure and sand to pass from the upper end of the sand boot into the containerin forming the molds and cores. I y I 2, The method of making molds and cores which consists .in placing a container in which-themolds orcores are formed upon a sand boot, supplying fluid pressure to thesand 'boot through the bottom thereof to carry sandcfrom the boot into the container raise and thereby form the molds in thecontainer. 3. The method of making molds and cores which consists in placing the containers in and cores with- I which the molds and cores are'formed upon the top of a sand boot, admitting fluid pres sure to the sand'boot through the bottom thereof to carry sand from the boot into the containers and thereby form the molds-and cores within the containers.

4. The method of making sand molds which consists in placing a flask section npona sand boot, placing a half pattern ontop of said flask section to leave the imprint. of the pattern in the sand mold formed in said flask'section, and supplying fluid pressure to the sand boot to force sand from the boot. into the flask section on top thereof and thereby form a mold within said flask section.

5. In apparatus for making sand molds and cores, a sand boot having openings in the upperend thereof through WhlCh sand is delivered to the flask sections in forming the molds, and means on said boot adapted to supply gaseous fluid pressure thereto and force the sand upwardly through said. opening's into the flask sections on top of said sand boot in formin the molds and cores.

6. In apparatus or making sand molds and'cores, a sand boot havin openings in theupper end thereof throng which sand is delivered to the containers in which the molds and cores are formed, blow lugs in said openings arranged to project mto the containers and having closed outer ends with a side outlet adjacent to the closed outer ends whereby the directionof flow of the sand passing therethrough is changed in said t adapted to supply gaseous fluid ressure thereto .and force sand upwardly om the boot through the blow plugs into the flask sections in forming the molds and cores. 1

7. Apparatus for forming green sand molds and cores comprising a sand boot having a platen or table thereon arranged to support the flasks and core boxes in whiph 60 the molds and cores are formed, means for supplying fluid pressure to the sand boot' through the bottom thereof to propel sand therein upwardly out of the top end of the sand into the flasks and core boxes, and.

emer g from the blow plug, and means on means movable into and out of positionfor 1'55.

holding the flasks and core boxes in position on the platen during the mold and core form:

ing operation.

8. Apparatus for forming green sand, .molds and cores comprising a sand boot having a platen or table thereon arranged to support the flasks and core boxes in which the molds and cores are formed, means for supplying fluid pressure to the sand. boot through the bottom thereof to propel sand therein upwardly out of the top end of the sand boot into the flasks and core boxes, means movable into and out of position for holding the flasks and core boxes in position. on the platen during the mold and core forming operation, and power means for actuating the holding means.

9. Apparatus for forming green sand molds and cores comprising a sand boot having aplaten or table thereon arranged to support'the flasks and core boxes in which .the molds and cores are formed, means for supplying fluid pressure to the sand boot through thebottom thereof to prbpel sand therein upwardly out of the top end of the sand boot into the flasks and core boxes, means movable into and out of position for holding the flasks and core boxes in positi n on the platen during the mold and core forming operation, and power means for ac- 85 tuating the holding means, said holding means having half patterns removably secured on the lower face thereof, arranged to enter the upper ends of the flask sections and leave the imprint thereof in the sand forced into the flask from the sand boot.

10. In apparatus for making sand molds and cores, a sand boot having .openings in the upper end thereof through which sand is delivered to the flask and core boxes placed thereon in forming the molds and cores, and means for supplying fluid pressure to said sand boot to lift and force the sand upwardly from the sand boot through said openings into the flask and core boxes whereby to form the molds and cores.

In testimony whereof, I have hereunto set my hand.

JOHN o; BANNISTER.

Witnesses:

FRED J. TALBOTT, A. J. NEWLIN.

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