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Publication numberUS2085324 A
Publication typeGrant
Publication dateJun 29, 1937
Filing dateSep 5, 1934
Priority dateSep 5, 1934
Publication numberUS 2085324 A, US 2085324A, US-A-2085324, US2085324 A, US2085324A
InventorsKarl A Lindner
Original AssigneeAmerican Smelting Refining
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Metal mold
US 2085324 A
Abstract  available in
Images(5)
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Claims  available in
Description  (OCR text may contain errors)

June 29, 1937. K. A. LINDNER METAL MOLD Filed Sept. 5, 1954 5 Sheets-Sheet 1 INVENITOR flaw/1Q Zmaiz BY W5 ATTORNE June 29, 1937. K. A. LINDNER METAL MOLD Filed Sept. 5, 1954 5 Sheets-Sheet 2 (Z6 INVENTOR F el/E Zflmnzr ATT June 29, 1937. I K. A. LINDNER 2,085,324

I METAL MOLD Filed Sept. 5, 1934 5 Sheets-Sheet 3 )2 WP-H wv'wi' if I W W W I by v 7 ll ll 7 7 I INVENTOR BY mm ATTORNEY Patented June 29, 1937 UNITED STATES METAL MOLD Karl A. Lindner, Rahway, N. J., assignor to American Smclting and Refining Company, New York, N. Y., a corporation of New Jersey Application September 5, 1934, Serial No. 742,714 13 Claims. (01. 22-139) The improved form of mold to which the present invention pertains is designed to produce improved metal castings, such as castings of copper or other metals or alloys having substantially like properties, the invention dealing especially with an improved form-.of mold construction for the casting of electrolytic copper, in the form of cakes possessing definite predetermined dimensions, and other desired characteristics.

In the production of high grade castings from electrolytically refined copper or copper of similar purity, the best results have been attained by pouring into upright water-cooled molds having a vertical casting cavity with parallel sides or sides closely approaching to parallelism, undersuch conditions that the cast metal is rapidly solidified and caused to shrink free from the walls of the casting cavity, 50 that it may be discharged therefrom by gravity.

In order to produce high-grade castings of the above-indicated character, it has been thought necessary to employ the cooling water, or other cooling medium, entering the mold for cooling the same to solidify the metal, at relatively elevated temperatures, certain operators specifying temperatures lying between approximate extremes of 160 F. to 212 R, such operators laying emphasis upon the inoperativeness of using jacketed molds through the jackets of which water is circulated to cool the mold by connecting the mold to an ordinary service pipe supplying water at temperatures approximating 50 to 60 F., alleging that the cooling of the mold by water entering at such a low temperature cannot produce castings of the high-grade, uniform character throughout the cake and perfect surface required for the production of flat cakes for rolling.

However, it has been found that it is entirely feasible to produce cast ngs of the requisite highgrade unifOrm character throughout the cake, and with the perfect surface required for the production of fiat cakes for rolling, by cooling the mold by connecting it to an ordinary service pipe supplying water at temperatures approximately 50 to 60 F., or what is commonly known and referred to as tap water, when certain precautions are taken in applying the mold dressing or mold wash to the interior ,of the mold.

It will be recalled that it is customary to employ, in casting operations, a mold dressing which coats the interior of the mold and forms a separating medium between the surface of the mold and the molten metal being cast therein. Bone ash is a customary material for this purpose, it being applied to the mold by suspending it in a liquid such as water, and spraying or flushing the suspension into the mold until the inner surfaces thereof are coated with the dressing. The mold is heated during the application of the dressing sufliciently to cause a rapid evaporation of the liquid in which the bone ash is distributed, the solid material adhering to the surfaces of the mold and forming a coating thereover.

It has been found that where the mold dressing is uniformly distributed in a comparatively thick coating over the interior of the mold, it is entirely feasible to cool the mold by connecting it to an ordinary service pipe supplying tap water at temperatures approximating 50 to One of the objects of the present invention, therefore, is to provide an improved mold structure which facilitates the application of an even, comparatively thick, coating of a mold dressing to the interior of the mold.

A further object of the invention is to provide a mold of the above-indicated character having a movable bottom permitting ready access to the interior of the mold, enabling a ready application of a heavy, even coating of the mold dressing to the interior of the mold, while preventing excessive accumulation of mold dressing on the bottom of the mold, thereby very materially enhancing the production of satisfactory castings with the low temperature of cooling water such as mentioned above.

A further object of the present invention is to provide an improved mechanism for opening and closing the bottom of the mold, and an improved construction of the mold bottom itself.

Other objects of the invention will become apparent as the description proceeds, the invention being exemplified in the discussion and illustrations hereinafter set forth in detail, and in the combination and arrangement of parts shown in the accompanying drawings, and described in the following specification, the features of novelty of the invention being more particularly pointed out in the appended claims.

Although the novel features which are believed to be characteristic of this invention will be particularly pointed out in the claims appended hereto, the invention itself, as to its objects and advantages, and the manner in which it may be carried out, may be better understood by referring to the following description taken in connection with the accompanying drawings, in which Fig. 1 is a perspective view of an iron core assembly for forming cooling ducts in the sides of the mold;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 is an elevation of the interior of one side of the mold; O

Fig. 4 is a sectional view taken on the line fi l of Fig. 3, looking in the direction of the arrows;

Fig. 5 is a sectional view taken along the line 55 of Fig. 3, looking in the direction of the arrows;

Fig. 6 is a top plan view of the mold assembly;

Fig. 7 is a sectional view taken along the line 'II of Fig. 6, looking in the direction of the arrows;

Fig. 8 is an end view of the mold assembly illustrated in Figs. 6 and 7;

Fig. 9 is a sectional view taken along the line 99 of Fig. 7, looking in the direction of the arrows; Fig. 10 is a fragmentary side elevation of the mold showing details of the improved bottom construction and mechanism for operating the same;

Fig. 11 is an end elevation of the mold of Fig. 10, the view being taken at right angles to Fig. 10;

Fig. 12 is a detail view of the bottom operating mechanism illustrated in Figs. 10 and 11;

Fig. 13 is a sectional view taken on line I3I3 of Fig. 12, looking in the direction of the arrows;

Fig. 14 is a plan view of the mold bottom showing guide means for the closure gate to assure proper centering thereof;

Fig. 15 is a bottom view of the closure gate employed for closing the mold bottom;

Fig. 16 is a side elevation of the closure gate illustrated in Fig. 15;

Fig. 17 is a side .elevation of a modified form of the construction, illustrating the use of a double cam for efiecting positive movement of the mold bottom both towards and away from the mold;

Fig. 18 is an end view of the construction shown in Fig. 17.

Referring more particularly to the drawings, Figs. 1 and 2 show an iron core assembly comprising headers I0,.cross pipes II and end cross pipes I2, the latter tbeing positioned out of line with the cross pipes }'I I. Figs. 3 to 5 show a mold side piece I3 used in constructing the mold. Two such pieces or sections are joined by bolts It extending through drilled holes I5 to form the sembly upon uprights 25 carried by frame 26 which is mounted on wheels 21. I

In constructing the mold, an iron core assembly such as illustrated in Figs. 1 and 2 is constructed comprising headers It with cross pipes II and end cross pipes I2. Molten copper is then cast around the iron pipe assembly to yield a copper block in which the pipes III, II and I2 are embedded. The pipes are then removed as by leaching with sulphuric or hydrochloric acid preferably agitated with air to assist in dissolving the iron, after which the block is suitably machined to form a mold side piece or section having longitudinal cooling ducts 28a and 28b, and transverse cooling ducts 29 and 33.

As shown in Fig. 5, one side of the mold section is machined to provide a recess which upon assembly with a similar mold section forms the mold cavity. For reasons hereinafter pointed out, great care is exercised in machining this recess or cavity in order to insure a very definite and predetermined taper of not less than 0.025 nor more than 0.075 inch per foot of mold depth. Again, while such definite taper is provided along the sides 3| of the mold which define the thickness of the copper cake or slab cast therein, the sides 32 of the mold which define the width of the cake or slab are machined parallel without taper. By this relatively slight but definite tapering of the sides 3| of the mold sections, a mold cavity having a slightly greater cross-sectional area at the top than at the bottom is provided in the assembled mold. Also, as shown in Figs. 3, 5 and 6, the outer portions of the sides of the mold sections lying on either side'of the mold cavity are machined or recessed at 33 to provide flanges 34 on opposite sides of and adjacent to the mold cavity.

In assembling the mold, holes I 5 are drilled through the mold sections and two such sections are joined by bolts It. Gate II is provided with a cooling duct 35 and closes the bottom of the mold. The mold is mounted in yoke 2|.

For cooling the mold inlet header 36 connected with longitudinal cooling ducts 28b and outlet header 31 connected to longitudinal cooling ducts 2811 are provided. The other ends of the longitudinal ducts 28a and 2817 are closed withsuitable plugs 38a and 381), respectively. The header 36 is connected to a source of cooling medium, such as tap water, in any conventional manner, and preferably in such a way that the connection may be readily broken to allow the mold to be freely moved about the plant on wheels 21. Header 31 which exits the Water is likewise connected to a suitable outlet conduit. As has been mentioned above, it has been found entirely feasible to use ordinary tap water as the cooling medium where. a relatively thick, uniform coating of a mold dressing is applied .to the mold cavity. This mold dressing may be bone ash, the coating thereof being obtained by flushing a suspension of bone ash in water through the mold cavity. Or the dressing may be a mixture of an inert substance selected from the class consisting of boneash, bone-black, or graphite, or combinations thereof, and a suitable adhesive constituent, such as rosin, gum copal, gum arabic, gum tragacanth, rosin pitch, glue, gelatin, or the like, dissolved in a suitable low boiling solvent such as, for example, denatured alcohol. Thereafter, the molten copper is poured into the cavity and the mold cooled by means of water introduced through inlet header 36 into the longitudinal ducts 28b, whence it passes upwardly through the sides of the mold by way of transverse ducts 29 and 30 into longitudinal ducts.28a. from which it exits through header 31; By thus keeping the mold relatively cool but above the dew point of the adjacent atmosphere, Warping and checking of the mold walls is materially reduced. Upon solidification of the copper, the headers 36 and 31 may be disconnected and the cast copper cake which has the definite taper corresponding to the dimensions of the cavity is released from the ctvity by inverting the mold and yoke.

It has been said above that care must be taken to apply the coating of the mold dressing uniformly to the surfaces of the mold cavity. Therefore, in order to provide ready access to the mold cavity at both ends thereof, and to prevent excessive accumulation of the mold dressing at the bottom of the mold, the bottom of the mold cavity may be opened as desired by the provision of the gate i1 and the improved mechanism for operating the gate, so that the mold cavity may be entirely open for flushing in the mold dressing, thereby facilitating the production of a uniform coating thereof on the surfaces of the cavity while securely and tightly closing the cavity during actual molding operations.

Gate I1 is provided for the purpose of opening and closing the mold cavity I6. The underside of gate IT is provided with a wear plate 4| of suitable hard material, such as steel, for forming a wearing surface for an operating cam 42, welded or otherwise suitably secured to an operating shaft 43, the cam 42 being eccentrically positioned relatively to the shaft 43, as clearly shown in Figs. 10 and 13, which also show clearly the preferred shape of the cam.

The shaft 43 is turnably mounted in suitable bearings formed in bars 44, 44 interconnecting straps 45, 45 secured by bolts 46, 46, or equivalent members to the side pieces l3 of the mold, the shaft 43 being held in position by collars 4T, 41 abutting against the bars 44, 44 and secured by cotters 48, 48. The shaft 43 may be provided with a squared end 49, Figs. 10, 11 and 12, for the reception of an operating crank, not shown, by means of which the shaft 43 and cam 42 may be turned.

It will be seen that the wear plate 4| moves along the curved surface of the cam as the cam is rotated. In order to properly guide the movement of the gate H, the wear plate 4| is provided with a lug 56 which continuously engages the curved surface of the cam and serves to help control the movement of the gate responsive to actuation of the cam. The gate Ill engages guide angles 5| 5|, and 52, 52 during its movement,

these guide angles being provided with slotted similar hole 51a therethrough, so that when the shaft 43 is turned to close the gate during casting, the lugs and holes will be brought into registry for receiving a safety locking bolt 58, which prevents the shaft 43 from turning during pouring of the metal into the mold, thus assuring the bottom of the mold being securely closed during casting operations.

It will be seen that since the gate I1 is supported by the cam 42, when the shaft is turned the gate will follow the curved surface of the cam, its movement being guided by lug 56 and by the guide angles 5|, 5|, and 52, 52; and the configuration of the cam is such that the bottom of the mold will be freely opened when the gate has reached its maximum open position, thereby enabling a ready application of a uniform coating of a mold dressing to the surfaces of the mold cavity l6. During the casting operations, the cam 42 tightly clamps the gate against the bottom of the mold, the gate being held properly centered by the guide angles 5|, 5| and 52, 52. Loss of metal through the bottom of the mold is thereby prevented, and the insertion of the safety bolt 58 through the lugs 55 and 56 positively prevents accidental opening of the gate i1 during casting operations, as the shaft 43 is securely held against turning. The application of an even coating of mold dressing enables ordinary tap water to be employed as the cooling medium with entire satisfaction and with no detrimental effects on the properties of the castings.

As will be seen from Figs. 17 and 18, a plurality of cams may be used where the mold is of large size, so that a straight movement of the mold bottom is assured, as well as positive movement both towards and away from the body of the mold.

For accomplishing this purpose, a pair of cams is shown, the individual cams being indicatedat 42a and 42b, and being similar in shape to the cam 42, cams 42a and 42b being mounted on shafts 59 and 6|], respectively, and being provided with meshing gears 6|, 6|, whereby the cams will be simultaneously rotated upon actuation of either cam, as described in connection with cam 42, above. The position of the cams beneath the mold bottom or gate I1 is such that the gate i1 is always squarely presented to the mold body so that a proper closure of the mold cavity by the gate is assured at all times together with positive movement of the gate both towards and away from the mold body.

While certain novel features of the invention have been disclosed and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes may be made by those skilled in the art without departing from the spirit of the invention; and obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention; and it is wished therefore not to be restricted to the precise construction herein disclosed, it being intended and desired to embrace within the scope of the invention such modifications and changes as may be necessary to adapt it to varying conditions and uses.

Having thus described and shown an embodiment of this invention, what is desired to secure by Letters Patent of the United States is:

l. A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity, supporting mechanism for the closure including a cam, means for actuating the cam to cause movement of the closure member towards and away from the mold body and cavity, and means for guiding the movement of \the closure rectilinearly relatively to the mold body.

2. A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity, supporting mechanism for the closure including a cam and a turnable shaft carrying the cam, and means for guiding the closure in rectilinear movements relative to the mold cavity responsive to turning "movements of the shaft and cam.

on the closure engaging the cam to control the movements of the closure.

4. A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity, supporting mechanism for the closure including a cam engaging the closure and a shaft carrying the cam, and guides depending from the mold body for guiding the closure in rectilinear movements relative to the mold cavity responsive to turning movements of the shaft, the closure beingmaintained by the guides in centered relation relative to the mold cavity.

5. A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity, and mechanism for supporting the closure and for imparting movement thereto relatively to the mold body and cavity, the said mechanism comprising a shaft and a cam eccentrically mounted on the shaft and engaging the closure for maintaining the closure in clamped relation against the mold cavity when in closed position while controlling the movement of the closure to open position responsively to corresponding movement of the shaft and cam.

6. A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity, and mechanism for enabling the closure to move substantially rectilinearly relatively to the mold body, the said mechanism including guides extending from the mold body between which guides the closure moves, a cam for actuating the closure, and a shaft for operating the cam, the closure being maintained by the guides in centeredev relation relative to the mold cavity.

'7 A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity, mechanism for enabling the closure to move substantially rectilinearly relatively to the mold body, the said mechanism including guides extending from the mold body between which guides the closure moves, a cam for actuating the closure and a shaft for actuating the cam, the cam being eccentrically 'mounted on the shaft, the closure being maintained by the guides in centered relation relative to the mold cavity, and locking means for preventing turning of the shaft during casting operations therebypreventing displacement of the closure relative to the mold cavity mold body defining a mold cavity therein, of

sup orting means for the mold body,-a movable closure for the cavity, mechanism for moving the closure substantially rectilinearly relatively to the mold body, the said mechanism including a cam and a shaft for actuating the cam, and cooperating lugs on the shaft and mold supporting means adapted to receive a locking pin therethrough when the closure is in closing position for preventing turning of the shaft during casting operations.

10. A mold comprising the combination with a mold body defining a mold cavity therein, of supporting means for the mold body, a movable closure for the cavity, mechanism for enabling the closure to move substantially rectilinearly relatively to the mold body, the said mechanism including guides extending from the mold body between which guides the closure moves, a cam for actuating the closure and a shaft for actuating the cam, the cam being eccentrically mounted on the shaft, the said closure being maintained by the guides in centered relation relative to the mold cavity, and cooperating lugs on the shaft and mold supporting means adapted to receive a locking pin therethrough when the closure is in closing position for preventing turning of the shaft during casting operations.

11. A mold comprising the combination with a mold body defining a mold cavity therein, of supporting means for the mold body, a movable closure for the cavity, mechanism for enabling the closure to move substantially rectilinearly relatively to the mold body, the said mechanism including guides extending from the mold body between which guides the closure moves, a cam for actuating the closure and a shaft for actuating the cam, the cam being eccentrically mounted on the shaft, the said closure being provided with a wear plate engaging the cam and being maintained by the guides in centered relation relative to the mold cavity, and cooperating lugs on the shaft and mold supporting means adapted to receive a locking pin therethrough when the closure is in closing position for preventing turning of the shaft during casting operations.

12. A mold comprising the combination with a mold body defining a mold cavity therein, of supporting means for the mold body, a movable closure for the cavity, mechanism for enabling the closure to move substantially rectilinearly relatively to the mold body, the said mechanism including guides extendingfrom the mold body, between which guides the closure moves, a cam for actuating the closure and a shaft for actuating the cam, the cam being eccentrically mount ed on the shaft, the said closure being provided with a Wear plate engaging the cam and a guide 1 lug adapted to ride on the surface of the cam for guiding the movements of the closure responsively to movements of the cam, the closure being maintained by the guides in centered relation relative to the mold cavity, and cooperating lugs on the shaft and mold supporting means adapted to receive a locking pin therethrough when the closure is in closing position for preventing turning of the shaft during casting operations.

13. A mold comprising the combination with a mold body defining a mold cavity therein, of a movable closure for the cavity; a plurality of cams for operating the closure and intermeshing gearing on the cams for effecting simultaneous operation of the cams to produce positive movement of the closure both towards and away from the mold body.

' KARL A. LINDNER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2609576 *Dec 6, 1949Sep 9, 1952Thompson Prod IncMethod of making hollow shapes
US2679669 *Sep 21, 1949Jun 1, 1954Thompson Prod IncMethod of making hollow castings
US2687278 *May 26, 1948Aug 24, 1954Chrysler CorpArticle with passages
US2810170 *Jun 4, 1954Oct 22, 1957Internat Smelting And RefiningSplash control means for casting copper cakes
US2811759 *Sep 15, 1955Nov 5, 1957Internat Smelting And RefiningCopper cake mold
US2844855 *Nov 1, 1954Jul 29, 1958Bristol Aero Engines LtdMethod of producing castings with one or more internal passages
US2993248 *Feb 16, 1959Jul 25, 1961Anaconda American Brass CoApparatus for casting copper cakes
US4842798 *Sep 15, 1987Jun 27, 1989Diversified Products CorporationMethod of moulding racquets with stringing holes
US4981639 *Mar 6, 1989Jan 1, 1991Diversified Products CorporationMethod of moulding racquets with stringing holes
US5154221 *Jan 15, 1990Oct 13, 1992Creusot-Loire IndustrieDevice for fixing and cooling a graphite block of a graphite wall of a mould
Classifications
U.S. Classification249/163, 164/348, 264/DIG.440, 249/79, 165/168, 249/115, 425/DIG.120
International ClassificationB22C9/06
Cooperative ClassificationY10S264/44, Y10S425/012, B22C9/06
European ClassificationB22C9/06