US1763895A - Method and mold for casting hollow metal articles - Google Patents

Description

June 17, 1930. A. LAW 1,763,895

METHOD AND MOLD FOR CASTING HOLLOW METAL ARTICLES Filed Feb. 27, 1929 5 Sheets-Sheet l g A awvcn for;

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METHOD AND MOLD FOR CASTING HOLLOW METAL ARTICLES Filed Feb. 27, 1929 a Sheets-Sheet 2 Fl .5 Q 9 16 15 15E I U a Fig.6. a

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June 17, 1930.

METHOD AND MOLD FOR CASTING HOLLOW METAL 3 Sheets-Sheet 5 Filed Feb. 27, 1929 L lrzzl LII filler? Law Patented June 17, 1930 Urrs STATE rsr orsics METHOD AND MOLD FOR CASTING HOLLOW METAL ARTICLES Application filed February 27. 1929. Serial No. 342,966.

This invention relates essentially to a method and mold for casting hollow metal articles, particularly such as tubular pipe littings, and it is designed to provide a duplex pattern plate whereby the core composed of green sand is molded and the plate serves to impress the exterior of the relief portion of the patternlin the green sand contained in the drag and cope.

An object of the invention is to provide a plate with cavities on one side to form the core and protuberances or relief patterns located in the reverse side of the plate for impressing one half of the pattern in the sand of the drag and the other half in the sand of the cope.

Another object of the, invention is to provide a vent plate for impressing channels in the half section of the core after the sand is poured and rammed into the cavities of the pattern plate.

Another object of the invention is to provide the pattern plate with arbors suspended in the cavities and locking means adapted for withdrawal from the exterior of the plate after one half of the core is finished. In this arrangement the arbors, after the two sections of the core are formed, constitute supports whereby the core is floated or positioned in spaced relation to the pattern impressed in the sand of the drag and cope.

Another object of the invention is the method of impressing one half of the pattern in the drag and the other half in the cope by the use of a plate having protuberances or patterns in relief and then using the reverse cavity side of the plate to mold the two sections of the core. k,

The novel combinations of the invention are more fully described in the following specification and claims, reference being made to the accompanying drawings in which:

Fig. 1 represents a plan view of a pattern plate embodying this invention.

Fig. 2 is a side view of the same.

Fig. 3 is a section taken along the line 3-3 of Fig. 1.

, Fig. 4 is a similar section taken alongthe line el -4 of Fig. l. 7

Fig. 5 is a plan view of the core vent plate. Fig. 6 is a side elevation of the same.

Fig. 7 is a side elevation showing the method of molding the drag. I

Fig. 8 is an inverted plan view of the pattern plate showing the arbors keyed in the cavities.

Fig. 9 is a side elevation showing the method of molding the cope.

Fig. 10 is a'detail section taken along the line 10-10 of Fig. 8.

11 shows the flask prepared for casting.

As; indicated in Figs. 1 to 4, the numeral 5 designates a pattern plate which is provided with protuberances 6 at the top and cavities 7 atthe bottom of the plate, it also has portion 6 to form core prints. The plate also has lateral flanges 8 made to form'handgrips for actuating the plate and ears 9 each with a hole 10 serve to align the plate on an ob ect, as hereinafter described.

In Figs. 5 and 6 is shown a vent plate 11 having longitudinal and transverse ribs 12 and it has side flanges 14 for manipulating the plate. The configuration of the ribs can be varied depending on the shape of the art cle to be cast. The core vent plate is furnlshed with a plurality of ears 15 each havng a pin 16 for engagement with the holes in the ears of the pattern plate. A drag 17 hav ng similar ears 18 to coac't with the pins 16 is arranged I over the pattern plate, as shown in Fig. 7 i

As indicated in Fig. 8, the cavities have suspended therein arbors 19 supported on notched shoulders'QO formed in the wall of the cavity. These arbors extend longitudinally and transversely, but the arrangement can be changed to suit different shaped cores. A locking key 21 with a handle 22 extends inwardly through a bore in the plate 5 and it has a bevelled end124 best seen in Fig. 10 to contact with the face of the arbor so as to prevent the arbors from dropping out when the plateis reversed.

In Fig. 9 is shown a cope 25 having ears 26 with a pin 27 fixed to each ear in order to align the cope with the attern plate or with the drag. l

The method of molding the core and making the impressions of the pattern in the sand of the drag and cope is as follows Place the pattern plate having the arbors positioned in the cavity with its core side up, ram up the core side of the plate pattern and strike ofl' the sand. Place the core vent plate with its ribs against the core face of the pattern and reverse to the position shown in Fig. 7. The drag 17 is then slid onto the pattern plate, the relief pattern beingon top,

ram the sandin the drag then lift off and set aside. The halfof the core and'th'e pattern is then formed by lifting off the pattern plate and leaving the core resting on the core vent plate, then take the drag half of the flask and position it over the core which rests on the core vent plate,'reverse and then remove the core vent plate, and the drag half of the moldiis complete. Insert the pins on the ears ofthe cope through the holes in the ears of the pattern plate with its core side up, as indicated in Fig. 9', set the locking pins for the arbors, ram up and strike off the surplus sand, reverse and placethe upper half of the core on top of the drag thereby completing the entire core. Ram up the sand'in the cope with the relief ofthe plate on top, strike off and punch a 'sprue hole 28 through the sand to communicate with the space 29 between the face of the'core and the surface of thejpatterns impressedin the sand of the saidplatehaving'a'cavity in'thereverse side whereby a portion of the core isproduced.

2;; An apparatus for forming a mold in which; to cast hollow metal articles com-; prising a plate with protuberantpatterns in relief on one side for impressing in thesand containedin the'flask one portion of a mold, said plate'havinga cavity in the reverseside whereby a portionof the core is produced and a plate adapted to cooperate withsaid pattern plate having means thereonto form ventsin' the core; Y

3.;An' apparatus for forming a mold in which to 'cast hollow metal articlescomp'risingf;aplate with protuberant patternsin relief-on-oneside for impressing inthe sand contained in the flask one portion'of a mold,

said plate having a cavity in'its' reverse side for produclng a portionof a core; bores'located in the wall of thecavity, meanslocated in the cavity wall for supporting an arbor, and locking means extending through said bores coacting with the arbor to prevent 7 it from dropping out of'the cavity when reversing the plate.

' 4. The method of forming a mold for casting hollow metal articles which consists in taking a plate provided with patterns in relief on one side and cavities in the reverse side with cavity side uppermost, said cavities having arbors therein, filling the cavities with sand, placin'g'a core vent plate over the cavity side of the pattern plate, reversing both pattern and vent plates, placing the drag over the relief side of the pattern plate, filling the drag with sand, lifting off the drag, removing the pattern plate, positioning the drag over the half core resting on the vent plate, reversing the drag and vent plateand removing the vent plate thereby completing one-half of a mold with a half core lying therein, then taking saidpattern plate with cavity side uppermost and having core arbors locked therein and filling the cavities with sand and placing it overv .the aforesaid half of the finished mold, releasing the locking device, lifting off the pattern plate, taking the pattern platewith relief side up, placing the cope over said plate and filling it with sand, removing the co efrom the pattern plate and positioning t e cope over the finished half mold thereby completing the entire mold.

5. The method of forming the drag-half of a mold for casting hollow metal articles which consists in taking a plate provided with patterns in relief on one side and cavities in the reverse side with the cavity side'uppermost, placing arbors in the cavities, filling the cavities with sand, placing a core vent plate with vent forming ribs therein over the cavity side of the pattern plate, reversing both the pattern plate and vent plate to bring the relief side of the pattern plate uppermost, placing the drag over the relief side i of the pattern plate, filling up the drag with sand, lifting off and setting aside the drag,

lifting off the pattern plateleaving one-half of the core resting on the'vent plate, positioning, the drag over the half core resting on the vent plate, reversing the mold, removingthe vent plate wherebyone-half of a mold with a half core lying therein is completed.

.6. The method of forming the cope part of a mold for casting. hollow metal articles which consists in usinga plate with patterns and corresponding cavities with the c'avity side uppermost, placing and locking arbors in the cavities, filling the cavities with sand, reversing the plate with cavity side down and placing'it over the finished drag part of a mold, releasing the'lockingldevice, lifting off the pattern plate whereby the upperhalf of the core lies on the lower half of the core, taking the pattern plate with-the relief side up, placing the cope over said plate, filling it with sand, punching a sprue hole through the cope, removing the cope from the attern plate, positioning the cope over the nished drag mold. thus forming a, complete mold.

In testimony whereof I have hereunto set my hand.

ALBERT LAW.

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