US1836977A - Core box - Google Patents

Description

A. K. LAUKEL CORE' BOX Dec. l5, 1931.

original Filed Jah. 13, 1927 ATTORNY PatentedA Dec. 15, 1931 PATENT. OFFICE ARTHUR K. LATVJKEL, OF DETROIT, MICHIGAN CORE BOX Original application led Ianiary 18, 1927, Serial No Vi929. Serial This application is a division of my'copending application Serial No. 160,862, filed January 13, 1927. j

This invention relates to the manufacture of nietai core boxes bv electro-deposition such as in the manner described in my pendmgapplication for Letters Patent of the Unit-ed States, Serial No. 101,069, filed April 10,1926, and has for its object to provide in a simple iff manner for the special protection of sharp edges about the cavity of thevcore box so as s to increase their resistance wear under the abraiding infiuence of core sand or similar material. `1

Generally for the sake of cheapness and expediency in electro-deposition it 1s pre-V i'erred to use copper as the metal of the core box, and as this metal is somewhat soft, the sharp exposed edges thereof are more or less e easily burred over at the face or parting line orp the box, and to resist thistendency to burr at such edges I propose to provide theJ core box with a. face of hard metal extending to the outlines of the cavity of the box and thereby protecting the aforesaid exposed edges. It is also proposed to provide such hard metal face by means of electro-deposition in the process of manufacturing the core box, and aiso to effect the electro-deposition of such hard metal upon a previously deposited 61m oi' copper which issubsequently removed from the hard metal in the cleaning up of the finished core box. l

The invention is Jfully disclosed by way of l example in the following description and in the accompanying drawings in which Figure 1 is an elevation of a mold used in the electrolytic production of a core box;

Figure 2 isa transverse section of the same; Figure 3 is a similar transverse section iliustrating a mold with a face plate applied thereto and a plate of hard metal depositedV on the mold at the required place;

Figure 4 is a similar view of Figure 1,

. 160,862. Divided and this application led May 23, No. 365,843.

illustrating the condition of the -mold` according to Figure 3;

Figure 5'is a transverse section of the mold after all ofthe plating operations are com- P ete;

Figure 6 is a perspective view illustrating the electro-deposited core box removed from the mold; and

Figure 7 is afragmentary de tail sectional view illustrating a modification of the process. uw

Reference to these views will now be made by use of likecharacterswhich are employed to designate corresponding parts throughout.

The numerall indicates a mold comprising a base 2 on the face of which projects a pattern 3 for the formation of the cavity of a core box, and according to an arrangement which I havewfound very satisfactory, the face of the moldis recessed as at 4 vfor the reception of a face plate 5 of brass or Similar rigid material, the inner margin 4a of the said recess 4 roughly following the outline of the projecting pattern 3.

The said mold is prepared for plating by providing a conductive surface 6 on the mold immediately surrounding the pattern 3 as indicated in Figure V2, this being preferably done before the application of the face plate 5 to the mold so that theinner margins ofA lthe face plate will overlap the said conductive surface, On this surface I then electrolytically deposit a plate of metal of a wear resisting y quality comparative to the principal metal of which the electro-deposited parts of the core box are to be `made. Thus, where the electro-deposited core'l box is to Vbe of copper the electro-deposited plate referred to may be of nickel. This is indicated by the reference numeral 7 'It will be observed that Athis plate of nickel of wear resisting metal extends from the inner margins of the face i plate V5 to and into the angles between the pattern proper 3 of the lmold and the base 2 thereof.V 'i

Following this the pattern proper `3 is 9 place 5 and the edges of the cavity of the core box is the marginal film of hard metal so that the sharp edges are of a wear resisting nature and much less likely lto be damaged or burred by the action of core sand being rammed into the core box.

"According to Figure 7 the depositing of the Wear resisting metal is first proceeded by a fiashingvlO of copper or other metal adapted to form a specially suitable surface for the depositing of such Wear resisting metal, for

instance, Where the conducting surfaceof the mold is of silver sulphide, there may ordinarily be a tendency of nickel to become detached therefrom or peal, and to prevent this an "initial fiashing of copper is deposited on the sulphide surface, to which flashing the nickel will adhere much more closely. The flashingA may be readily removed if necessary or desirable from the surface of nickel after Vthe removal of they shell from the mold A longer Wearing core box may be secured in themanner described, with little difficulty, and the said invention overcomes one of the objections sometimes met with in the use of "electro-deposited'copper core boxes Where they are utilized in high production Work and subjected to abuse in the making of cores therefrom.

Although specific embodiments of the in- 4'vention have been illustrated and described,

it will be understood that various alterations in the details of construction may be made Without departing from the scope of the invention as indicated by the appended claims.

` What IV claim is:

1.` In a metal core box having a molding face defining a cavity, a face plate surrounding said cavity, a Wear piece of a relatively hard metal embedded in said face plate at the margin of said cavity and extending to the Wall of said cavity, the remainder of said molding face being of a less hard metal.

2. In a metal core box having a molding face defining a cavity, a face plate surrounding said cavity, a Wear piece of a relatively hard metal embedded in said face plate at the margin of said cavity and extending to Y,the wall of said cavity, the remainder of lsaid molding face being of aless hard metal,

the face and Wear piece being bonded together at all points of contact.

3. In a metal core box having a molding face defining a cavity, a face plate surrounding said cavity, a Wear piece of a relatively hard metal embedded in said face plate at the margin of said cavity and extending to the Wall of said cavity, the remainder of said molding face being of a less hard metal, the face and Wear piece being electrolytically bonded togethervat all points of contact.

In Witness whereof I have hereunto set my hand.

ARTHUR K. LAUKEL.

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