US1910790A - Chaplet - Google Patents

Description

' Patented May 23, 1933 I W mental magnesium,

W core in position,

W the pouring operation and that a was obtained. Various low me ting meta s UNITED STATES PATENT OFFICE H mane BROWN, or momma, IIOHIGAN, assmxoa re rim now cnnmcu, comm;

0E MIDLAND, MICHIGAN, A CORPORATION OI MICHIGAN CHAPLET llo Drawing.

vention to provide an improved means for 5 maintaining dry sand cores in a substantially fixed position in a mold whereby the making of cored magnesium castings is facilitated.

The term magnesium is used herein and in the appended claims to mean not only elebut also alloys thereof wherein the magnesium content predominates.

l have found that the difliculties inhering to prior holding the core in position maybe overcome by using a chaplet comprising cadmium.

'lo the accomplishment of the foregoing I and related ends, the invention, then, consists f of the steps and product hereinafter fully described and particularly ointed out in the claims, the following escription setting forth, in detail one mode of carrying out the invention, such disclosed mode illustrating, 9% however, but one of the various ways in which the principle of the invention may be used.

in the casting of maesium it has been general practice to avoi insofar as possible the use of chaplets for holding a dry sand due to the numerous disadvantages attaching to such mode of proce dure. For instance, if the chaplets were made of magnesium or aluminum, it was I fond that, owing to the nearly equal melting lift pointsof the chaplet and magnesium and to the resence of an oride film usually found on c aplets consisting of maesium, such chaplets did not fuse satisfactorily dug oor castin e, g. tin, bismuth, etc, and alloys thereof, have been proposed and tried as chaplets, but all such as have been suggested possess the disadvantage of forming an alloy between the metal of the chaplet and the mesium of such constitution that a brittle zone results in the finished casting.

ln making magnesium castings it has,

therefore been established practice to avoid w the use of chaplets as by suspending the cores processes ofmaking cored magnesium 11 castings wherein chaplets are employed for Application lied July 1, 1988. Serial Ito. 880,589.

from the top of the procedure can not always be employed withoutunduly complicating the mold and further, when used, is often excessively timemonsuming and expensive. Byusing cha lets consistin of cadmium I have been ab e-to support dry sand cores in molds wherein the thickness of finished casting apprbximated one eighth of one inch, and have determined that such practice results in substantially perfect fusion between the chaplet and the magnesium, whereby a finished casting of excel- I lent quality free from brittlenessis obtained. In certain instances,

thin section is to be cast, it may be found desirable to employ an alloy of cadmium with relatively small amounts of other suitable thickness of the section to be cast is somewhat greater, e. g. one to two inches or more l havefound it advantageous to use a chaplet consisting of cadmium alloyed with an amount of magnesium sufficient to elevate the melting point of the chaplet to a temperature such that the chaplet does not lose its strength by fusion with the magnesium being poured into the mold before performing its function of supporting the core. ft is evident that the composition of the chaplet may be varied over a wide range, since cadmium and magnesium alloy perfectly in all'proportions, and further it is evident that a chaplet of any desired melting point in the range between the melting points of cadmium and magnesium may be readily obtained, or y of zinc, tin, etc., may be incorporated with the cadmium-magnesium that small amounts in order to improve the properties thereof.

- llllanifestly, my chaplet may be constructat 7 ed in any suitable form, e. double head with round or square plates, uble head waterbaclr, saddleback or bridge, curved, ferrule, etc., Without departing from the spirit of my invention. Y I

mold. However, such such as 1n supporting acore ill a mold wherebetween an extremely of pure cadmium can be Other modes of applying the principle of my invention may e employed instead of those explained, change'being made as re-' gards the steps and means herein disclosed,- provided those stated by any of the following claims ,or their equivalent be employed.

I therefore particularly point out and distinctlf claim as my invention 1. n castingmagnesium thev method of maintaining a dry sand core in a substantially fixed position in a mold which comprises interposing between the core and the mold a chaplet comprising cadmium.

2. In casting magnesium the method of maintaining a dry sand core in a substan tially fixed position in a mold which comprises interposing between the core and the mold achaplet comprising cadmium'having alloyed therewith magnesium.

3. In casting magnesium the method of maintaining a dry sand core in a substantially fixed position in a mold which comprises interposing between the core and the mold a chaplet consisting of cadmium having alloyed therewith a relatively small amount of a metal from the class consisting of zinc, lead, and tin.

4. A chaplet for use in maintaining a dry sand core in a substantially fixed position in a mold while casting magnesium 1D the said mold composed predominantly of cadmium.

5. A chaplet for use in maintaining a dry sand core in a substantially fixed position in a mold while casting magnesium in the said mold consisting of cadmlum "having alloyed therewith magnesium.

6. A chaplet for use in maintaining a dry sand core in a substantially fixed position in a mold while casting ma esium in the said mold consisting of cadmium having alloyed therewith a relatively small amount of a metal from-the class consisting of zinc, lead, and

tin. I

Signed by me this 28th day of June, 1932. LESLIE BROWN.