US1345162A - Process of preparing molds for castings - Google Patents

Description

E. FRIES.

PROCESSOF PREPARING MOLDS FOR CASTING.

APPLiCATlON .mao OCT. 15. 1919.

1,345,162, PatentedJun 29,1920;

3 SHEETS-SHEET l- 2 I I I 5 I l I I I flinTNMillllll I E. muss. PROCESS OF PREPARING MOLDS FOR CASTING.

APPLICATION FILED OCT. 15, I919.

Patented June 29, 1920.

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PROCESS OF PREPARING MOLDS FOR CASTING.

APPLICATION FILED 0C.T15,1919.

1,345,162. PaienteRJune29,1920.

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'the box in which it was formed;

UNITED srpxrss PATENT OFFICE. c i

EDWARD FRIES, or ivroonns, PENNSYLVANIA,

rnocnss or PREPARING Moms FOR CASTINGS.

To all whom it may concern: Be it knownthatI, EDWARD FRIES, a citizen of the United' States, and a resident of Moores, county-of Delaware, State of Pennsylvania, have invented certain Improvements in Processes of Preparing Molds for Castings, of which the following is a specification; I My invention relates to certain improvements in the process of preparing molds for making castings, particularly intricate castings oflarge size. v

One object of my invention is to improve the processof preparing molds'for making castings by dispensing with the ordinary portable drag section of a flask, in which themold was formed'and in which the casting was made. I v

A further object isto-provide a bottom plate which will support the mold during the entire process. 1

A still further object is to so carry out theprocess that the mold can be baked without an inclosing flask, and to provide-a fixed flask to receive the bottom plate, mold and cores and in which the'casting is made. I 'These objects I attain inuthe following panying drawings, in which 2- Figure 1, is a v1ew showing the mold in manner, reference being had to the accom- Fig. 2, is a perspective View of the pattern;'

Fig. 3,;is a perspective view of the mold on a bottomplate, ready to be placed in an 'oven'to be heated to the required degree;

,7 Fig. {1, is a view of themoldshowing the cores assembled; I

Fig. 5,'is a View showing the mold and cores located apermanent flask;'and

" Fig. 6,*isa perspective view of the flask within a pit and the cope secured to the flask ready for pouring.

Heretofore, in maklng-large'molds such as'those forcylinder castings for locomotives, the ordinary'movable copeand drag sections of'a flask were vused, and the flask carriedthe mold: from start to" finish, and when the'rnold was bakedit was baked with the drag'section' of the flask and when the cores were a'ssembled a man had to stand in the flaskand set the cores, andflit was a difficult matter to see that all the intricate passages'we're clear ofdirt or otheriforeign In carrying out my improved Specification of Letters Patent. 7 Patented J e 29, 1920,

Application filed October 15, 1919. Serial No. 330,692.

matter, and that the cores were set in the proper. positions. After this the drag, with its mold, was carried to the pouring floor and the cope located on it and themetal poured, then .;the.flask-was raised from the casting andsand and removed to a storage place for future use, the ried from the floor.

Theportable drag sections of the flask were large and heavy, necessitatingthe use of cranes, and theyroccupied considerable space; Furthermore, by the constant heatcasting being -caring and cooling theflasks would crack,

which would render them useless, and if the crack occurred during the pouring operat1on the molten metal would flow over the ,floor and serious accidents would result.

The above method required a very'deep pattern, as a mold: of the full height had to be made at the beginning of the process.

.such a size. as-to fit withinthe flask and,

consequently, the flask can be located in a stationary position, preferably in a pit, while the bottom plate and'the mold are inserted in the flask and, when the metal is poured therein, the casting is removed by withdrawing thebottom plate.

process and referringto .Fig. 1, 1. is a box having end and side walls2 and 3., respectively, and the box isrectangular, in the present instance.

Pivotally mounted in this box a'replates 4, the hinges5of which are pivoted to the endsQof the box, as clearly shown in. the drawings. Between the opposite ends of these pivoted plates, 4 and the side walls of thebox are wedges 6, theendwalls having shoulders 7 formed thereon against which 1' the plates are'held by" the wedges.

.When it isdesired to make a smaller mold than that for which the box is intended,

one or more plates .8 may be inserted in the box; 9 is a-bottom plate and 10 is apattern located on the plate, 9 within the box.

The mold 11 is fOI'IIlGdaOIltlllS pattern and a plate 12, which becomes the bottom plate of the bottom plate. The wedges 6 are then re.

, free to swing moved, leaving the pivoted side plates 4: so that the-box can be readily withdrawn rom the mold. After this, the pattern is also withdrawn from the mold. In some instances, the pattern may be withdrawn first and then the box, leaving the mold on the bottom plate 12, as clearly shown in Fig. 3.. Slings 13 are then attached to the bottom plate, asshown, and the-slings are engaged by a crossbeam of a crane, as illustrated in the drawings. The bottom plate 12, with the mold 11 thereon, is then' conveyed to a position in front of an oven where it is transferred to a carriage adapted .to a track leading into the oven. The; carriage is then pushed into the oven andthe mold is allowed to remain therein until theparts are properly baked, so that the sand will hold its position during the processof casting." I z a When the mold isremoved from the oven certain cores 14 are placed in the mold,

depending upon the character'of' the article bein cast. 'Itxis then carried to the casting floor and the bottom plate 12, with the mold and cores thereon, is lowered into the permanent flask 15, which is made as shown clearly in Fig. 5, having fixed end walls 16, and an adjustable side wall 17, 'held by pins 18 adapted to holes in'the end walls,

as illustrated in Figs. '5 and 6, and'a fixed 7 side wall 17%- r The remaining parts of the mold arethen assembled to build the mold up to the proper level; these parts having been previously baked, and as the parts of the moldl'are assembled in the flask, sand is rammed be tween the walls of the flask and the mold, after which the cope19 is placed 'in'position on the fixed flask 15 and clamped thereto. That portion of the mold in the cope is formed in the present instance in the ordinary manner. 7 placed in position and the metal poured. At the proper time the cope is removed and the slings 13'are engaged by the 'hooks of a crane and the bottom plate 12, with the casting thereon, is removed from the fixed flask 15 which can be made ready foranother mold. 1

By this process,I avoid the necessity of lifting the heavy flasks each time a casting is made,'and I also avoid the necessity of baking "the mold in a flask, as'theflask is permanently located in a pit. It I can be made muchheavier than the ordinary flask and will last indefinitely. By locating the fla'sk within the pit,-'in

The pouring head 20, is

the event of the flask cracking, ora break occurring in any part thereof, the molten metal will flow. into the pit and not over the floor, thus avoiding accidents and injuries tothe men employed.

By my improved method, I am enabled tomake a single flask which can be adjusted to fit molds of different dimensions. I Heretofore,, particularly in casting cylinders of is no inclosing flask for themold duringthe baking operation, or when the parts of' the mold are assembled. Thexassembled. mold Furthermore, making the 'is-placed in the fixed flask asthe last ,oper- V ation. 1

Iclaimr 1" I,

1. The process herein described of making molds for castings, said process consisting in first placing a patterntwithin a forming box, making a mold with'in" the box, placing a bottom plate on the mold,

' inverting the box, removing the box and pattern from'the mold, baking the mold'while onthe bottom, plate without/a flask, then carrying'the mold bythe bottom plate to a fixed flask having an inner dimension of a size to receive'the bottom plate, lowering the bottom plate,..with the mold, into the flask, and closing the flask for pouring.

2. The processherein described ofmaking a mold for "casting, said process consisting in placing a pattern within the forming box, making amold within the 'box, placing a bottom plate on the mold, invertingthe box, when removing the boxand pattern from the mold, baking the mold while on the bottom plate without afiask, placing the bottom plate, with-the mold thereon, in a fixed flask, lowering the plate andthe mold within the flask, closing-the.flask, pouring the'metal in the flask, and finally removing E the casting produced by lifting the bottom plate out of the flask.

3. The process herein-described of making molds for castings, said process consisting in first placing a pattern within: a box and .making a sand mold within the .box and around the pattern, mounting abottom plate on the mold, inverting the box, with the mold and pattern therein, removing the box andpatternffrom the mold, then'baking the -mold while'on the bottom plate and with- "out a flask, locating the bottom. plate and #mold within a fixed flask, building up the mold to the level of the topof the fixed flask,

mounting a cope thereon With another porpattern therein, removing the box and pat- 10 tion of the mold therein, and finally pourtern from the mold and bottom plate, baking ing the molten metal into the mold. the mold, then assembling cores on the mold 4,. The process herein described of prepar- While on the bottom plate Without a flask, ing molds, said process consisting in first then placing the mold with the cores thereon placing a pattern Within a box, forming a in a fixed flask, and placing the cope, With 15 mold Within the box and on the pattern, the other section of the mold therein, in po-- placing a bottom plate on the completed sition on the fixed flask ready for 1pouring. mold, inverting the box, With the mold and p EDWARD F IES.

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