US736131A

US736131A - Process of producing uniformity of quality in molten metal.

Info

Publication number: US736131A
Application number: US2306900A
Authority: US
Inventors: Richard G G Moldenke
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-07-10
Filing date: 1900-07-10
Publication date: 1903-08-11
Anticipated expiration: 1920-08-11

Description

No, 7364131. PATENTED AUG. 11, 1903).

v R. G. G. MOLDENKE. PROCESS OF PRODUGINGUNIPORMITY OF QUALITY IN MOLTEN METAL.

APPLICATION FILED JULY 10, 1900.

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I DENKE, a citizen of the United States, resid To a, whom it may concern:

UNITED STATES Patented August 11, 1903.

ATENT 'FFICE.

PROCESS OF PRODUCING UN IFORMITY F QUALITYIN MOLTEN METAL.

SPECIFICATION forming part of Letters IPatent No. 736,131, dated August 11, 190 3.

Application filed July 10,1900. $erial No. 23,0 69. (No specimens.)

- Be it known that I, RICHARD G. G. MOL- ing at Pittsburg, in the county of 'Allegheny,

State of Pennsylvania, have invented or 'dis covered a certain new and useful Improve- 1 Hcretofore,so far as I am aware, it has been uniform quality. To illustrate: Suppose we drawfrom a heat of malleable iron with aand cast the metal so drawn in a casting of V Wefind' that the ment in Processes of Producing Uniformity of Quality inMolten Metal, of which improvement the following is a description.

My invention relates to processes for producing uniformity of q'ualityin molten metal, cast-steel, and malleable-iron castings.

impossible to attain uniformity of quality in metal in any given heat or melt, as when tapped or poured from or near the bottom of the furnace, as at present practiced, metal widely difier ing in quality is withdrawn at each pour or tapping, making it impossible to utilize the entire melt in castings ofrequired composition of .75 silicon from or near the bottom, where the temperature of the metal is lower than that at a higher level or plane,

two-inch-square section. metal is of the quality known as a 5 gray iron.

If, however, at the same instant we tap the furnace slightly below the pla'ne'of the molten metal, where the temperature of the metal is. considerably higher than at the bottom, and

cast the metal drawn therefrom into a cast ing of the same size as in the preceding instance mentioned, we find that the metal is of a quality known as a white iron. In the metal drawn from the bottom we also find that the carbon oft-he composition has separated in the form of graphite, whereas in the metal drawn from the top the carbonremains combined. Under the present method of melting and pouring the metal we thus unavoidably obtain metal of varying and different quality.

The object of my invention is to obviate this difliculty and produce uniformity of quality in molten metal, cast-steel, and malleableiron castings, and to this end my invention consists in the following method of treating the metal and pouring the same.

Figure l is a front elevation of a furnace which can be used in connection with my process, and Fig. 2 an end view of the furnace.

I charge a furnace of any usual construction in the usual manner to produce when melted metal of any required composition. After the metal at a higher level or plane has been brought to the proper temperature, and by test, the required quality I tap the furnace at a point below the plane of the molten metal sufficient to withdraw metal of the required quality. After the metal has been withdrawn to such point the pouring is discontinued and the heating continued until'the metal then at the top of the furnace has attained the temperature and quality of that previously with drawn. The furnace is then tapped a distance below the level or plane of the metal corresponding to thefirst and the metal withdrawn, as in the previous instance, and these A steps continued untilthe entire heat has been the top of the furnace to a desirable temperature and quality, then tapping the same a short distance below the plane of the metal and pouring therefrom until the metal varies in temperature and quality from that required, then suspending the pouring a short time until the metal at the top, which is ata lower level than before, again attains the temperature and quality previously secured, then tapping the metal below the plane thereof, a short distance below the point of the previous tapping, and pouring therefrom, and these steps continued until the heat or molten metal has been withdrawn.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

RICHARD G. G. MOLDENKE.

In presence of CLARENCE A. WILLIAMS, JOHN H. HONEY.