US1768802A

US1768802A - Method and apparatus for forming greensand cores

Info

Publication number: US1768802A
Application number: US128782A
Authority: US
Inventors: John T Stoney
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-08-12
Filing date: 1926-08-12
Publication date: 1930-07-01
Anticipated expiration: 1947-07-01

Description

July l, 1930. J. T. sToNEY 1,768,802

METHOD AND APPARATUS FOR FORMING GREEN SAND CORES Filed Aug. 12l 1926 4 Sheets-Sheet 1 gwunto'o atroz wars f|| Il \.\v Jr l 4 v QN .QN u d l R M.N\\ mm n WY M.f A H, kq mn H @w Nm. \&\

July l, 1930. J, T, STONEY 1,768,802

METHOD AND APPARATUS FOR FORMING GREEN SAND CORES Filed Aug. 12, 1926 4 Sheets-Sheet. 2

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J. T. sToNEY 1,768,302

METHOD AND APPARATUS FOR FORMING GREEN SAND CORES July 1, 1930.

Filed Aug. 12, 1926 @Sheets-Sheet 3' S11/vanto@ 4 Sheets-Sheet 4 J. T. STONEY Filed Aug. 12, 1926 Qfbf/ METHOD AND APPARATUS FOR FORMING GREEN SAND CORES July 1, 1930.

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ltromwq Patented July l, 1930 JOHN '.l. STONEY',` OF CLEVELAND, OHIO ME'rHon AND APPARATUS Foa FoRmNG GREENSAND conne Application tiled August 12, 1926. Serial No. 128,782.

My invention relates to a method and apparatus for forming green s and cores and positioning the same with respect to the two halves of the mold.

b' The principal feature of the invention resides -in the use of green sand for forming again and which is not the case when thesand cores are once baked. So far as is known there has never been any satisfactory method or apparatus produced which is capable of forming cores of green sand and positioning them absolutely-with respect to the molds, thel positioning being effected from the first step in the method. Thesel cores heretofore have been formed of sand and baked and then positioned within the mold and because of the necessity of having to` bake the sand cores the sand could not be used over again and this alone resulted in considerable loss of sand and money.

The principal reason for not having utilized green sand heretofore,`in forming cores, has been due to the fact that` absolute accuracy is essential in forming these cores and no practical apparatus has been conceived up to this time which so' formed and held the green sand to permit any amount of handling without injury to the core. My apparatus is so designedy and the core so supported and reinforced that it can be handled considerably`without fear of injury to the core. Furthermore, the sand from the core can be broken up after the core has been used in the La mold and sifted and used over again in making another core. l

A further object of the invention is to provide apparatus of the type for the purpose mentioned, which has interengaging portions i0 .so positioned that the correct location of the core within the mold is assured from' the be'- ginning of the formation of the core and continues so throughout the operation.

Another object. of the invention is to provide apparatus which has means for conveniently and positively transferring the core through the various steps of the method in a quick and true manner and without injury thereto.

10 A still further object of the inventionl is Ain' production and a reduction in operating -costsand costs of products-is the result. .the cores which may belused over andover Jigs.

to provide an' apparatus which has the varil ous parts so .associated that a considerable saving in time in forming and placing the core 1s assured and, therefore, an increase The invention further resides in the construction of the variousparts of the apparatus which are, novel and new.

With the objects above indicated, and other objects hereinafter explained in view, my invention consists in the method and apparatus and the details of construction of the various elements hereinafter described and claimed.

Referring to the drawings "Fig. 1 is a sideelevationalviewof the core box. 'A

' Fig. 2 is a front elevational View of the same. v

Fig. 3 is a top plan view of the core'box with the arbor supporting means removed.

Fig. 4 is a perspective view of a pair of green sand cores supported on a pair of 5 Fig. 5 is a cross sectional view of the half. mold showing the position of the cores and their supporting jig with respect thereto.

Fig. 6 is a top plan view of the jigs showing the positioning means and the position of the cores with respect thereto.

Fig. 7 isa side elevational view of the arrangement shown in Fig. 6.

Fig. 8 is a sectional view on line 8-8 of Fig. 5 showing how the coresare supported in the mold.

In the drawings, 10 indicates generally aA core box which has a base 11 supported on any suitable means 12.v The core box 10 comprisesa front member 13 which has

sides

14 and 15 extending at right angles and formed integrally therewith and which extend upwardly for about half the height of the front member 13, as indicated at 20. The rear member 16 is similarly shaped and has sides 17 and 18 extending at right angles and formed integrally therewith which extend upwardly to a height corresponding to the sides 14 and v15. The

sides

14 and 15 engage along their ends with the ends of the sides 17. and 18, aS

indicated at 19, thereby forming a box which is substantially square Shaped in cross section.

Side members

21 and 22 engage with the upper half of the front member 13 and rear member 16 respectively and the lower edge thereof rests upon the upper edge 23 formed by the sides 14 and 18 and the sides 15 and 17. The inner faces f these

upper side members

21 and 22 correspond to the upper edges of the front member 13 and rear member 16 and assembled they form a substantially enclosed core box 10.

The base 11 is provided with studs 24 which extend upwardly therefrom and engage with openings 25 formed in the lower surface of the rear member 16 for the purpose of positioning the complementary members. A locking arm 26 is pivotally attached at 26aL to the

sides

14 and 15 of the front member 413 and engages a stud 27 secured to the sides 17 and 18 of the rear member 16. The locking arm 26 has secu-red thereto an extension 28 as a means for disengaging the same from the stud 27. k

A stud 29 on the ends of the

sides

14 and 15 fits into recesses 30 in the adjacent ends of the sides 17 and 18 and serves to align the two' side members with respect to each other. Sirriilar studs 31 extend inwardly from the upper side member 22 into recesses 32 in the upper portion of the front memberv 13 and rear member 16, and studs 33 extend inwardly from the upper side member 21 into recesses 34 in the upper portion of the front member 13 and rear member 16 but on opposite sides thereof. These interengaging portions are for-the purpose of aligning the

upper side members

21 and 22 with`respect to the front member 13 and rear member 16.

The

upper side members

21 and 22 are provided With

studs

35 and 36 which extend out- Wardly from the ends therefrom and a detachable locking arm 37 has a hook 38 at one end engaging thestud 35 and a depending arm 39 at the opposite end engaging the stud 36 which serves to maintain the upper side upper portion of the front member 13 and rear member V16. A handle 37*al is formed upon the end of the arm 37-beyond the depending arm 39 for affording a means for disengaging the locking arm-37 from the stu-ds `35 and 36.

The base 11 is adapted to receive a pair of circular T-shaped members 40' which fit into correspondingly `shaped recesses41 and are .c secured in place by means of screws orbolts site ends engage lugs or studs 46 on the inner surface of a plate 47. This plate 47 is detachably mounted on the upper end of the upper side member 22 by means of studs 48 secured to the under-sideof the plate 47 which studs fit into recesses 49 in the upper end of the upper side member 16.

The arbors 45 have a spider 50 associated therewith near theirupper ends for the purpose of'reinforcing the green sand forming the core. This spider 50 assumes a horizontal position within the core box to the arbors 45. A

In forminga green sand core and employ ing the apparatus thus far described, the front 13 and back 16 are positioned upon the base 11, the pins 24 engagingwith the recesses 25 and the pins 29 in the

ends

14 and 15 engaging with the recesses. 30 in the adjacent ends 17 and 18.` These front and back members are then locked together by means of the locking arm 26 engaging with the pins 27 on the sides 17 and`18.

The

upper sides

21 and 22 are then attached and'positioned by means` of the pins 31 and 33 engaging the recesses 32 and 34 in the upper portions of the front 13 and back 16. These sides are then locked in position by means of the locking arm 37 engaging the pin 35 at one end, and the pin 36 at the opposite end. Y

The arbors 45 are next placed within the core box having one end engaging the T- shaped member 41 and being maintained in vertical position by the detachable arms 47.4

A spider 50 is associated with the arbors 45 to form a reinforcement for the green sand. The green sand is placed within the core box 10 and pressure is-'applied thereto. The surplus sand on the top is scraped off and the sides and ends of the core box removed, the same being replaced by the jig 56.

Let us assume Anow that the green sand A core formed in the core box 10 is for the purpose of forming a four cylinder engine housing, asV indicated at 51, which is provided with a head 52 and a pair of cylinders 53

extendmembers

21 and 22 1n close relation to the ing from the under-side thereof. The heads 52 have 'spaced recesses 54 in the ends thereof While similar recesses 55 are provided in the ends of the cylinders 53, the two sets of recesses 54 and 55 being in axial-alignment. These recesses 54 and 55 expose the ends of the arbors 45 which extend throughout the green sand core 51. The cores 51 are formed separately in the core box 10 but are placed sidefby side as indicated in Fig. 4.

A jig 56 is formed with a channel base 57 having upwardly extending sides 58, thesesides, however, beginning at a central point and extending to the end. The sides 58 preferably lie in-a position adjacent to the cylinders 53. A fiat eXtension6O integral with the side 58 extends at right angles thereto` and the upper face is in the same plane as the upper edge of the side 58. Depending ribs 61 are formed integral with the extension and the side 58, and act as a reinforcing means. An upstanding peg 62 is positioned substantially centrally of the flat extension 60. It should be here understood that there are two of these jigs 56 provided which, however, include the same features of construction as heretofore described and only differ in that one jig is righthand and the adjacent jig is lefthand. The lower edge of the jig 56 under the cylinders 53 is rounded at 63 to provide an easy means for tipping the jig and core.

When the complementary core box members have been removed, the jig 56 is Substituted therefor and engages With one side of the core 51, as shown in Fig. 4. The jig 56 is then tipped over onithe channel 57 and the tipping thereof is facilitated by means of the rounded edge 63.

The righthand jig 56 is then placed upon a supporting and aligning base 64 which has a metal strip 65 secured to the front edge by means of bolts 66 and extends substantially above the upper surface of the base 64. L- shaped arms 67 are secured to the sides of the base 64 by means of bolts 68 and extend outwardly and upwardly With respect to the base 64. The upper end of the L-shaped arms 67 is provided with a supporting plate 69 Which extends on each side of the arms 67 and at right angles thereto. The heights and locations of these arms 67 and the metal strip 65 are all predeterminately located With respect to the position which the core 51 finally assumes with respect to the half mold. The upper edge of the L-shaped arms 67 also extends above the upper surface of the base 64 so that the engagement of the metal strlp 65 with the arms 67 forms an abutment for the jig 56. When the righthand jig 56 is properly located the lefthand jig 56 is placed in proper position adjacent thereto.

with the jigs 56 and the supporting platform 64 in the respective positions heretofore described, a second jig 70 is used to transfer the core 51 to the mold 86. This jig 70 is composed of a rectangular frame having end walls 71 and a front wall 73 and a rear wall 74 all formed integrally.

The end walls 71 are each provided with handles 75 adjacent their ends which serve as a convenient means for lifting the jig 70.

Aligning extensions 76 integral with the sides 71 are properly located with respect to pins 87 forming a part of the half mold 86. These aligning extensions 76 are provided with holes 77 extending therethrough.

The jig 70 is further provided with positioning bosses 78 having holes 79 extending therethrough. the bosses 78 residing within the frame and are supported h v

ribs

80 and 81 secured to the sides 71 and thi` rear wall 74. The holes 79 are so located'that when they engage with the pins 62 on the jig 56 the front wall of the jig 70 rests upon the flat extensions 69 of the arms 67 secured to the supporting platform 64.

The front Wall 73 and the rear Wall 74 have slidably mounted therein locking bolts 82 which have a depending leg 83 integral with the inner end thereof and a stud 84 extending forwardly of the arm 83 which is adapted to studs 84 have been inserted into the ends of.

the arbors 45 of the cores 51, the jig 70 is lifted from the jig 56 and supporting platform 64. and placed upon the half mold 86. This half mold 86 is provided with upstanding pins 87 which form a part of most molds for aligning the drag with respect to the cope. The holes 77 in the extensions 76 of the jig 7 0 are so located that they readily engage these pins 87 of the half mold 86 and in so engaging position the cores 51 correctly with respect to the mold 86. i

The locking bolts 82 are then withdrawn; disen aging the studs 84 from the ends of the ar ors 45, and the jig 70 is then removed by the handles 75 leaving the cores 51 resting upon portions of the mold 86 as shown in Fig. 8. The cope or upper half of the mold (not shown) is then lowered into proper position by its engagement with the pins 87 and all of the members are then locked in place.

It is to be understood that While I have described certain apparatus which preferably scts forth the desired construction, I am not to be limited thereto as many necessary and desirous changes may be made Without departing from the spirit of the invention as disclosed in the appended claims.

Having thus described my invention, I claim:

1. The method of positioning a green sand core with respect to a. mold which comprises positioning the core within a jig, positioning a second jig with respect to the core. positioning the core Within the second jig, positioning the second jig with respect to the mold, and removing the second from the core and mold.

2. The method of positioning green sand cores with respect to a mold. which comprises transferring the core to a jig, positioning a second jig with respect tothe tirst jig and the core. securing the core, to the second jig, positioning in a, predetermined position the lll) second jig carrying the core with respect to the mold, and removing the second jig from the core and mold.

3. The method of positioning a pair of green sand cores with respect to a mold which comprises forming a pairof suitable cores in a core box, transferring each core to a separate jig, placing the jigs side byside, positioning a second jig With respect to the cores and first jigs, securing the cores to the second jig, positioning in a predetermined position the second ji carrying the cores with respect to the mol and removing the second jig from the cores and mold.

4. The herein described method which comprises forming a core in a core box, transferring the core to a jig, placing a second jig in a predetermined position with respect to the first jig and core, securing t-he core to a second jig, placing the second jig and Icore in a predetermined relationship with respect to a half mold and removing the second jig from the'core and mold.

5. The herein described method which comprises forming a suitable core in a core box, transferring the core to a ig, placing the jig and core on a supporting ase in a predetermined position, placing a second jig in a predetermined position with respect to the core and first jig, securing the core to the second jig, placing the second jig and core in a predetermined position with relation to a half mold, and removing the second jig from the core and mold.

6. The herein described method which comprises forming a suitablef green Sand core in a core box, transferring the core to a jig having a complementary surface, aligning the jig `on a supporting base, aligning a second jig with respect to the first jig and core, securing the core to the second jig, transferring in a predetermined position with respect to a half mold the second jig and core, and removing the second jig from the core 'and mold.

7. The herein described method which comprises forming a pair of suitablev green sand cores in core boxes, transferring the cores to a pair of jigs, placing the jigs side .by side in a predetermined position on a vsupporting base, placing a second jig in a predetermined position with resp'ect to the pair of jigs and cores, securing the cores to the second jig, transferring-the cores by means of the second jig to'a half mold and in a predetermined position, and removing the second jig from the cores and mold.

8. In an apparatus of the type described, a core box for forming green sand cores which have' positioning means associated therewith, a jig to which the core is .transferred, a second jig adapted to engage the first jig and provided with means tn engage the core, and means on the second jig adapted a jig to which the core is transferred, said f jig being provided with positioning means, a second jig provided with means cooperating with the positioning means and having mounted therein members for engaging said core, said second jig being further provided 'Y with means adapted to engage With a portion of 'a half Ymold to position the core with respect to said mold. e

10. In an ap aratus of the type described, avcore box for orming green sand cores, one or more arbors positioned within said box and around which the green sand is formed, a jig -to which the core is transferred, said jig provided with positioning means, a second jig provided with means cooperating with the positioning means and having mounted therein means for engaging the arbors of said core, said jig being further provided With means for engaging a portion of a half mold for1 (positioning the core with respect to the mo 11. In an apparatus of the type described, a .core box for forming green sand cores, means for positioning one or more arbors within the core in relation tofthe position of the core in the mold, a jig to which the core is transferred, a second jig provided with means for engaging the first jig, said second jig being further provided with slidable means for engaging the ends of said arbors, and means mounted on the second jig adapted to cooperate with portions of a half mold to position the core with respect to the mold.

12. In an apparatus of the type described,

.a core box for forming green sand cores on a ;spect to said mold.

13. In an apparatus for positioning green sand cores with respect to a mold, the combination of a core, a jig supporting said core,

a second jig supported by the first jigl and provided with means engaging said core, and means for positioning the second jig with respect to a mold.

14. In a device for positioning green sand cores with respect to a mold, the combination of a core provided with engaging means in the ends thereof, a jig supporting said core, a

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second jig provided with means for engaging the irst jlg in a predetermined position, said second jig being further provided with means for en aging the engaging means in 5 the ends of te core, and further means on said second jig for positioning the same with respect to the mold.

15. In an'apparatus of the type described, the combination of a jig adapted to receive a core therein, aligning means on said jig, a. supporting base, aligmng means on said base for engagement with said jig, and a second jig engaging the aligning means on the first jig and provided with means adapted to engage the core.

16. In an apparatus of the type described, the combination of a jig adapted to receive a core therein, a second jig engaging the first jig, said ji having interengaging parts and means sli ably mounted in the second jig adapted to engage the ends of the core.

l17. The method of positioning green sand cores with respect to a mold which comprises forming a core of green sand, engaging said core at a plurality of points, lifting the core by applying a common force to the points so engaged, and placing the core in the mold by engaging abutments fixed with respect to said points, with abutments fixed with respect to said mold.

In testimony whereof, I hereunto aiix my signature.

JOHN T. STONEY.