US1871422A - Semipermanent mold and method of making the same - Google Patents

Description

Aug. 9, 1932.

A B. NORTON SEMIPERMANENT MOLD AND METHOD OF MAKING THE SAHE Filed Aug. 21, 1929 2 Sheets-Sheet l INVENTOR 'AZlE/V B Amara/v ATTORNEYS Aug. 9, 1932.

A. B. NORTON s fl SEMIPERMA NENT MOLD AND METHOD OF MAKING THE SAME Filed Aug. 21, 1929 2 Sheets-$heet 2 INVENTOR AME/V B. A/OZETO/V martingale; j 371,422

I 1 warren-sures ire E T OFFI E f Y n' 3. non'romor am, 01:10. nssrenon mo comm or ERICA, A CORPORATION OF IPENNS,YLVANIA s new 4mm immune: e 7 s iinmion mes August e1,'1eea. "se1-1a in. 887,310. J

This invention relates to the casting of met- Fig. 5 is a transverse sect'ionalvl ew through al in molds having sand cores. More particthe completed green sand coreassembly. 'ularly it relates to a method of and an appa- Referring particularly to -Figs.'-3,' 4 and 'ratus for making and utilizing green sand. of the drawings, in its preferred embodiment, cores;

v t the green sand core assembly comprises the 55 It has been customary to cast metal around core 1 which is carried 'onth'e supporting plate a core made ofsand and itis customa to 2 on which itis centered by means of'engageplrl'gvide the sandy core-with a print w ich ment with spaced ribs -'3 which project outctions to support and position the core Wardly from the plate 2, and extend into the within the mold. In semi-permanent mold same. The plate 2 carries the positioning go work it has previously been customary to flanges 4 and 5 which function'to position and iashionthecore out of baked sand in order. support the same in a core box anda'lsoin a to bind the sand sufliciently to make it retain mold to be later described. When the-mold Y its shape during handling or to ramsand is assembled the supporting plate 2 serves as 7, It about an arbor and use the corewithout baka pilot about a which the mold sections are. 5

7 ing. Heretofore the bakedsand cores with? locked.

suitable core prints have been made in a core The greengsa'nd core assembly is preferx andsubsequently transferred to abake' ably formed by positioninga' split core boxoven on supporting metal plates, which metal 6 having acavity of any desired'configurw plates are remeved after baking and before tion,.in'a.ring 7 as shown inFig. 3 to hold the coresare inserted in the molds for cast the sections together. A ring 8 may be cening purposes ,The step of bakingsand c'ores tered on ring 7 by means of dowel pins (not is costl and time-consuming. The green shown) in the parting plane of the parts sand 'ar rtype cores were not-adaptable to; constituting the core'box .6. The ring 8 has 36 all castings because of the diificultly of propa convergin inner surface 9 into engage- 7 erlyram ming the sand about the arbor and mentwith w ich the core supporting plate 2 later removing the arbor from the casting. may be brought whereby the resulting core Itistherefore an object of this invention can be accurately positioned inth'e plane. to provide a green sand core assembly which Green sand is poured into the cavity of the so can'be utilized without a core print or arbor core box. 6 and is compacted therein, for ex-' so in making castings. where baked sand cores ample,- by ramming until it fills out'the cavhavehitherto been employed. It-i's a further ity of the core box; then the excess sand is chest to provide an improved method of scraped from the core box. 8.8,f0l' example, ,malkingagreensandcoreassembly. 7 Another by passing a straight edge member acrossobject is-to provide an improved mold and and in contact; with the top of thecore box. 8i green sand core assembly. Thenthe ring Sis positioned on ring 7 and I Other objects will be apparent from the box 6 and the supporting plate 2-which ma ficification and from thefaccompanying be made of iron-or other suitable material,

I wings in which latter. s s I isassembledin ring Swiththe projections 3 I p 4% Fig. 1 isa top plan View of amold conprojecting into the sand. and forming interta'ining sand core assembly embodying my" locking engagement therewith. I invention, i a v The green sand core assembly together Fig. 2 is a vertical sectional view taken with jthe'core box .6, and plate 7 is now rolled] along the line 2-2 of Fig. 1, j over or inverted 'into'the position illustrated 45 Fi '3 is a transverse sectional view of a 'iu'Figl'aiter which the ring '7 isremoved core dy showing one step in forming-a from the core box andthe core boxisections' greensand core according to my invention, 5 are parted and withdrawn ,from the core by Fig i is "a view similar to Fig. 3 but showsliding them apart on rin 8, ring 18 is then ing a subsequentstep in forming a green sand removed leaving the 'assemil y shown in' Fig. 5 core, and 7 5, in which the core lissuppor'ted upon'the plate 2. Then after the ring 8 is removed,

the assembly is ready to be used in a mold.

Referring articularly to Figs. 1 and 2, in its preferred embodiment, the mold com- 8 prises a base 10 carrying a post 11 to which is hinged one end of each of the mold sections 12 and 13. The opposed ends of the mold sections are latched to ther by means of a clamping block 14, which is pivoted to mold section 13 and can beswung into sition to cause the cam lever 15pivoted t ereto to be engaged behind the opposing mold section. Actuation of the cam lever 15 mold sections are loc ed.- This provision,

rovides a positive means of fixing thecore 1n position relative to the mold sections.

Circumferential movement of the core supporting late 2 is prevented by means of'a lug 17 w ich engages in a slot'in the flange 4 as can be seen in ig. 2. The. mold sections 12 and 13 are each provided with a recess, which recesses are adapted to cooperate to form a casting cavity around the core 1. Above the casting cavityand opening thereinto the mold sections 12 and 13 are provided with opposed recesses 18 which open through the top of the mold and which cooperate 'to form a feeder cavity through which themolten metal can be poured into the casting cavity of the mold.

In the illustrated iary core 20 is supported upon the base 10 and protrudes through cooperating recesses in the mold sections 12 and 13 and terminates in spaced relation to the sand core 1 and in spaced relation to the inner walls of the mold sections to form an outwardly protruding casting cavity adapted to cooperate with the first mentioned casting cavit for a puras, for example, to form a andle upon the article being cast.

In utilizing the device the sand core assembly is positionedupon the base 10 of the mold with the flange 4 resting thereon andthe downwardly extending flange 5 is positioned in lateral engagement with the walls of the recess 16. The projection 17 fits into place in the slot of plate 2. The mold sections 12 and 13 are now swung into co'-oper-. ating engagement and are'locked in closed position and core 20 is inserted. The molten metal to be cast is poured through the gate 18of the mold and permitted to flowintQ and around the casting cavity. Uponsol'idification of the metal the mold is openedand the cast article withthe green sand core reembodiment, an auxil tained therein can be removed from the mold andsupportingrplate 2. The core 1 can be broken away om the interior of the cast article. p Y I By the procedure described it will be seen that a san be utilized without a supporting mandrel and without a print under situations in which a print has heretofore been necessary, and that the core may be fashioned out of green sand and handled without being broken or baked.

While a specific embodiment of the invention has been shown and described it will be apparent that modifications can be made therein within the spirit'and scopeof the invention and" such modifications-are intended to be covered by the appended claims.

' What I claim'is- 1. A method for casting a recessed article which comprises compacting green sand into a core box, striking oif the sand to'form a fiat surface, positioning a flat supporting member on said flat surface, inverting the supporting member and core box,removing core has been provided which can the core box and positioning said supporting member and green sand core in a mold.

. 2. A method for casting a recessed article which comprises compacting green sand into a core box, strikingofl the sand to form a fiat surface, bringinga flat supporting member into engagement with said flat surface, inverting the supporting member and core box, removing t e core box, and. clamping the sections 0' a mold about said supporting member.

3. A method for casting a recessed article which comprises compactlng green sand into a core box,'striking"o'fi the sand to form a fiat surface, positioning a flat supporting member on said flat surface, inverting-the supportingmmember and core box, removing the core memberand een sand core in a base late and then locking the sections of a mold a at said supporting member.

'4. A semi-permanent mold for sauce ans x, positioning said supporting and the like comprising a base, apair 0 metalh'c mold halves pivoted to each other and to said base and being formed with co-operating recesses defining the side and top walls of the casting cavity, a removable metallic pilot positioned in said base and having a neck extending above the upper surface of the base and terminating in a relatively fiat surface, the lower portions of said; mold i halves being recessed to fit about and clamp against said neck, and a green sand core for face resting upon and spaced inwardly from:-

the edges of the flat upper surface of said pilot and having an upper portion of-greater diam- .eter than its bottom surface, said corebeing "9 wholly out of contact with said mold halves and being en ged and supported solely by the upper sur ace ofsaid pilot, the lower edge of the casting cavity being closed by a. portion of the flat up er surface of said pilot.

In testimony w ereof I hereunto ailix my signature this 12th da of Aug. 1929.

- B. fioRToN.

Images