US1962843A

US1962843A - Casting machine

Info

Publication number: US1962843A
Application number: US595393A
Authority: US
Inventors: Walter J Rudolph
Original assignee: Ludlow Typograph Co
Current assignee: Ludlow Typograph Co
Priority date: 1932-02-26
Filing date: 1932-02-26
Publication date: 1934-06-12
Anticipated expiration: 1951-06-12
Also published as: GB406128A; FR751210A; DE620513C

Description

11.112, 1934." R D LPH' 1,962,843

CASTING MACHINE Filed Feb. 26, 1952 5 Sheets-Sheet l 9 1, wyzw W Jqne 12, 1934. Q L H 1,962,843

GASTIN eeeeee NE Patented June 12, 1934 UNITED STATES CASTING MACHINE Walter J. Rudolph, Chicago, Ill., assignor to Ludlow Typograph Company, Chicago, Ill., a corporation of Illinois Application February 26, 1932, Serial No. 595,393

8 Claims.

My invention relates more particularly to improvements in machines for casting slugs, or the like, used in printing operations and comprising, generally stated, a crucible, or casting-pot, forming the supply of the molten metal from which the slugs or the like are to be cast, and a mold to which the molten metal is supplied; the invention relating, as by way of example, and more particularly, to machines of the general type 9 shown in United States Letters Patent No.

1,124,293 granted to E. S. Carman, January 12,

1915, in which machine the crucible is supported to rock about a horizontal axis and to swing about a more or less vertical axis and is associated with means for pumping the molten metal through the outlet of its throat portion, the machine also comprising a matrix structure supported against upward movement and a vertically movable mold the cavity of which opens through both its upper and lower surfaces, the machine operating to lift the mold to engage the underside of the matrix structure, thereafter swing the crucible to a position in which its throat portion is directly below the mold and then raise the throat portion into engagement with the bottom of the mold, the pump then being operated to force a charge of molten metal from the crucible into the mold. Following the operation just stated the crucible swings horizontally across the bottom of the mold and to one side thereof and then rocks downwardly at its throat portion away from the mold, the metal at the underside of the mold is trimmed off and the mold lowers to a position in which the cast slug is ejected.

My objects, generally stated, are to provide improvements in machines of the general char-.

acter above referred to to the end that the amount of air required to be displaced by the molten -metal in the casting operation will be reduced to the minimum; that such air as is in the mold may be displaced freely by the molten metal and thus permit of the making of a perfect cast; that the metal will flow into the mold in a flat stream as distinguished from the jetting of the metal into the mold through a series of small openings; and that the mouthpiece, or squirt plate provided at the throat portion of the crucible will be maintained at all times substantially at the same temperature as the molten metal and thus avoid freezing of the metal in the mouthpiece during the intervals between the casting operations; and other objects as will be manifest from the following description.

Referring to the accompanying drawings:

Figure 1 is a fragmentary view in side elevation, with certain parts sectioned, of a casting machine of the general construction, and operating on the same principle, as that shown in said Letters Patent, the mouthpiece of which is constructed in accordance with my invention.

' Figure 2 is an enlarged detailed sectional view of a portion of the structure shown in Fig. 1.

Figure 3 is a plan view'of the crucible of Fig. 1.

Figure 4 is a vertical sectional view taken at the line 44 on Fig. 3 and viewed in the direction of the arrows.

Figure 5 is a plan view of the mouthpiece.

Figure 6 is a view in side elevation of the mouthpiece. j

Figure 7 is an end view of the mouthpiece; and

Figure 8, a broken view in vertical section of the mouthpiece showing it in operative position relative to the mold.

Referring to the particular construction of casting machine illustrated and in connection with which I have chosen to illustrate my invention, 9 is the crucible, ,or casting pot, of the machine commonly heated in any suitable way to maintain therein a supply of molten type metal and mounted in a supporting casing 10, the crucible 9 comprising a reservoir portion 11 and a throat portion 12 having a separate mouthpiece 13, the reservoir portion 11 being provided with means for forcing the metal therefrom through the throat portion 12 and into a mold hereinafter referred to, these means being shown as formed of a cylindrical well 14 in the reservoir portion 11 opening at its lower end into the throat portion 12 and at a port 15 into the reservoir portion 11 and a' piston 16 reciprocable in the well 14 and operated by mechanism comprising the links 17.

18 represents the bed plate of the machine shown as disposed in slanting position and containing an opening 19 over which a set of matrices 20 supported in a stick", to cast the desired line composition on the slug to be formed, is positioned and held against vertical displacement.

The mold of the machine is represented at 21 and is open top and bottom and supported to be moved vertically into and out' of the position shown in Figs. 1 and 2 wherein it fits at its upper portion against the underside of the matrices 20 which latter form the top of the mold.

The casing 10, carrying the crucible 9, is hinged at 22 to a rotatable pivot member 23, to rock about a horizontal axis, the pivot member 23 being rotatable about a more or less vertical axis, these parts having associated therewith mechanism as described in said Letters Patent for rocking and ing through openings 26in the mouthpiece and the downwardly flaring portion thereof being subcommonly provided, and the'opening from the 7Q of the fin to the outlet portion of the mouthpiece,

wardly a few degrees from the position shown in Fig. 1.

It may be stated that'the particular construction of mechanism illustrated and above described is not of the essence of my'invention, this particular construction being shown merely to illustrate one form of machine in which the invention may be utilized; and as this machine as to its general features of construction, and principle of operation, is the same as that shown in said Letters Patent, the foregoing brief description of the machine and its operation will sufiice.

Referring now to the particular portion of the machine to which my invention relates, it pertains to the structure at the outlet of the throat portion 12 and more specifically to the construction of the mouthpiece 13.

In accordance with "the preferred illustrated embodimentof my invention, the mouthpiece 13 whichis formed of heat conducting material, such as for example steel, comprises a platelike portion 24 at which it is adapted to fit against the upper surface of the outlet of the throat portion 12 and be secured thereto as by screws 25 extendscrewing into the wall of the throat portion.

. The mouthpiece 13 also comprises a fin portion 2'7 depending from the plate portion 24 and disposed inwardly of the surrounding edges of 'the plate portion 24, thisfin portion extending downwardly into the outlet of the throat portion 12 to be in contact with the molten metal during the periods when the crucible is tilted down from the position shown in'Fig. 1, namely, between casting'j operations, and preferably in contact with thelmolten metal at all times. I

The'mouthpiece 13 contains a passage represented at 28 which opens through the bottom of the fin 2'? and through the upper surface of the mouthpiece, and through which the molten metal is forced, to enter the mold 21, upon actuating the piston 16.

The side walls of the passage 28, which is rela-' tively long and narrow as shown, flare in a crosswise direction downwardly from a point approximately midway between the upper. and lower surfaces of the plate portion 24 and the bottom of the fin portion 2'? as represented in Figs. 4 and 8, the portions of the walls of the passage 28 above stantially parallel. 1

'As the fin in the particular construction shown is of wedge shape'to adapt it to fit into a throat portion of a crucible of a casting machine as mouthpiece tothe mold by preference is of a length substantially equal to the length of the mold cavity, the passage 28 upwardly flares in a direction lengthwise thereof from the lower end as shown in Figs. 1, 2 and 6. It will be understood, however, that the shape of the passage 28 may be varied, as desired, from that shown withinthe scope of my invention.

The outlet of the mouthpiece and through which the metal is forced into the mold 21 is thus in the form of an elongated slot, shown as of substantially the same length as the cavity in the mold, but of a width, as represented in Fig. 4,

considerably less than the width of the mold.

cavity.

One of the purposes of the invention being to provide for the eifective conduction of the heat of the molten metal to the outlet of the mouthpiece to the end of maintaining the latter at a temperature as close as possible to that of the molten metal, it is preferred that the fin portion 27 be integral with the plate portion 24 of the mouthpiece thereby to afford the greater adaptability of the structure for the conduction of heat. In the particular construction shown the mouthpiece is formed of two

sections

29 and 30 each comprising a part of the plate portion 24 and half of the fin portion 27, these sections ritting fiatwise together and forming a joint therebetween represented at 31 which extends lengthwise of the passage 28 as shown in Fig. 5, the sections being represented as held together by rivets 32 engaging the sections of the fin 2'7 and rivets 33 engaging the sections of the plate portion 24,

it thus being understood that each section 29' and 30 formed as a one-piece structure cornprises a part of the plate portion 24 and a part.

of the fin portion 27.

As will be understood, the molten metal does not extend at all times to the upper surface of the mouthpiece, and thus in the forcing of the molten metal through the latter to effect a cast, such air as may be contained'between the upper surface of the mouthpiece and the level of the molten metal in'the throat portion at the time tage of reducing the area of moltenmetalexposed to the oxidizing effect of the atmosphere.

The fin in the particular construction shown, wherein it is provided as an integral part of the mouthpiece, thus not only serves to present a passage of relatively small cross-sectional dimensions for the molten metal with the advantages above noted, but serves to conduct heat from the molten metal to the plate portion of the mouthpiece for maintaining this plate portion in heated condition.

The provision of the outlet of the mouthpiece in the form 'of an elongated slot as stated is of advantage as it permits of the discharge of the molten metal into the mold in the form of a relativelythin sheet as distinguished from jetting the metal into the mold through a plurality of relatively small openings. V

t is also desirable in casting apparatus of the general character herein referred to that means be provided for permitting of the escape, from the mold cavity, during the casting opera-- Accordingly, means are provided for thus venting the mold,

these means according to the particular illustrated embodiment of the invention comprising two series of grooves 34 provided in the upper surface of the mouthpiece at opposite sides of the passage 28 and out of communication with the latter, the inner ends of these grooves registering with the cavity in the mold 21 and their outer ends opening to the atmosphere as shown in Figs. 5, 6 and 8 whereby the air in the mold is vented through a plurality of relatively small openings to the atmosphere, the portion of the mouthpiece through which the upper end of the passage 28 opens and in which the grooves 34 are provided, and represented at 35, being preferably elevated above the plane of the surrounding portion of the mouthpiece as represented in Figs. 5-8 which makes for simplicity of structure as regards the opening of the outer ends of the grooves 34 to the atmosphere.

While I have illustrated and described a particular embodiment of my invention, and shown it as incorporated in a particular construction of casting machine, I do not wish to be understood as intending to limit it thereto as the construction may be variously modified and altered and incorporated in other constructions of casting machines without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is:

1. A mouthpiece for the outlet portion of a crucible comprising a portion adapted to form a cover for said outlet portion andcontaining an elongated discharge slot, portions of the inner surfaces of the walls of which flare laterally outwardly crosswise of the slot toward the inlet portion of said slot.

2. A mouthpiece for the outlet portion of a crucible comprising a portion adapted to form a cover for said outlet portion and containing an elongated discharge slot, the inner surfaces of the portions of the walls of said slot at the outlet portion of the slot being substantially parallel and the inner surfaces of the portions thereof at the inlet portion of said slot flaring laterally outwardly cross-wise of the slot toward the inlet portion of the slot.

3. A mouthpiece for the outlet portion of a crucible comprising an apertured portion adapted to form a cover for said outlet portion and a hollow passage-forming member projecting from said cover at its inlet side and adapted to extend into said outlet portion and having an opening the walls of which surround the apertured portion of said cover and also an opening for communication with the metal in said outlet portion.

4. A mouthpiece for the outlet portion of a crucible comprising a portion adapted to form a cover for said outlet portion and containing an elongated discharge slot and a hollow passageforming member projecting from said cover at its inlet side and adapted to extend into said outlet portion and having an opening the walls of which surround said slot and also an opening for communication with the metal in said outlet portion.

5. A mouthpiece for the outlet, throat, portion of a crucible, adapted to extend into said throat portion and comprising flatwise opposed sections together forming an elongated opening through the mouthpiece with the joint between said sections extending lengthwise of the opening whereby the material of the mouthpiece extends continuously, without interruption, from the inlet to the outlet of the mouthpiece.

6. A mouthpiece for the outlet portion of a crucible adapted to extend into said outlet portion and having an elongated slot extending therethrough for the discharge of the molten metal, the inner surfaces of the end walls of said slot flaring outwardly to the extremity of the outlet portion of said slot.

7. A mouthpiece for the outlet of a crucible comprising a portion adapted to form a cover for said outlet and containing a discharge opening, and a wall on said cover portion extending around said discharge opening having a portion spaced laterally from an interior wall of said outlet.

8. In a crucible having a mouthpiece in its mouth, said mouthpiece having a discharge opening therethrough, a wall on said mouthpiece surrounding said discharge opening and depending into said mouth, a portion of said wall being laterally spaced from an interior wall of the mouth and adapted to enter molten metal in the mouth.

WALTER J. RUDOLPH.