US1086582A - Manufacture of molds for casting metals. - Google Patents

Description

CAROLINE J. M. IBOHL, or BROOKLYN, NEWYYORK.

MAIbTUFAGTURE OF MOICDS FOR CASTING METALS.

No'Drawing.

' To all whom it may concern:

Be it known that I, CAROLINE J. M. Box-11., a citizen of the United States, and res1ding at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in the Manufacture of Molds for Casting Metals, of which the following is a specification, such 'as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to molds'for casting metals, and the object thereof is to provide an improved mold for this purpose by means of. whicli'the delicate.outlines and designs of a finely wrought pattern can be perfectly reproduced in a mold from said pattern; a

further object being to provide a mold for the purpose specified which will stand or resist the heat of a furnace and also the heat of the metals poured into it without being fractured or broken.

In the practice of my invention I take equal quantities of plaster of Paris and ashes, which, being thoroughly ground or pulverized and thoroughly mingledor reduced to a thick liquid of the consistency of cream by stirring thereinto and mingling therewith a requisite amount of water. In this operation there will be formed on the surface of the liquid a greater or less amount of dirt or refuse matter which should be skimmed off. The liquid thus formed is poured over or around the desired pattern in a suitable receptacle to form the desired mold; and after the liquid has been allowed to set or become hard, which operation takes about half an hour, the mold so formed is removed from the pattern, or the pattern from the mold. The mold is then slowly dried in a low temperature of from 100 to 200 Fahrenheit, after which the mold is covered or painted with melted lard either on the inner side only, or on both the inner and outer sides according to the thickness of the mold, after which said mold is put in an oven or furnace the temperature of which isgradually raised to from 800 to 1000 Fahrenheit, according to the thickness or mass of the mold, after which said mold is The plaster of Parisand ashes contain some objectionable or interfering substances which will be burnt out ,in

the above operation, and this completes the mold which is now ready for use.

The above method of making a mold has i an advantage over other and somewhat simi- Specifitzation of Letters Patent.

stances may be used.

Patented Feb. 10, 1914.

Application filed May 1, 1913. Serial No. 764,891;

advantage especially when undercutpatterns are used. A mold made in this manner will give a finer result 1n castmg various metals and especially brass which is one of the hardest metals to cast on account of the quantity of fumes or gases which it discharges in the operation of casting. The ob ject of covering or painting the mold with melted lard and then heating and drying it 1n an oven, as hereinbefore described, is to prevent the mold from absorbing moisture. and this renders my improved mold much more efficient than others of this class especially, in the operation of casting brass, for which purpose no practical mold has heretofore been made, though many have claimed to be able to do so. By means of myimproved process a mold can also be made in much less time than is ordinarily necessary, this process requiring but one or two hours,

in some cases, in which other processes would require days. A mold made in this manner will also stand anymetal .or mixture of metals, this result being also accomplished by reason of the extremely porous quality of the mold.

This invention is an improvement onv stances which it is very difiicult to remove,

but which is entirely obviated by the improved process herein described. I

The use of my improved process is not confined to the purpose or object herein set out, as the same may be applied in making or manufacturing other articles or devices, and although I have described the use of lard for the purpose of painting the mold after it is formed and before drying or heating, it will be apparent, that other oleaginous sub:

Having fully described my invention what I claim as new and desire to secure by Letters Patent is A The method of making molds and other articles herein described, which consists of 10 then heating said mold in an oven, gradually raising the temperature to-"fro'm 800 to 1000 Fahrenheit. v

In testimony that I claim the foregoing as my invention I have signed .my name in presence of the subscribing Witnesses this 15 29th day of April, 1913.

CAROLINE J. M. BOHL.

Witnesses: 1 v

C. 'MULREANY, S. ANDREWS.