US2017394A

US2017394A - Metal casting

Info

Publication number: US2017394A
Application number: US720869A
Authority: US
Inventors: John J Boax
Original assignee: National Tube Co
Current assignee: National Tube Co
Priority date: 1934-04-16
Filing date: 1934-04-16
Publication date: 1935-10-15
Anticipated expiration: 1952-10-15

Description

Oct. 15, 1935, J. J. BOAX METAL CASTING Filed April 16, 1954 2 Sheets-Sheet 1 ziwenfar JoH/v J. 504x, 5% M Patented Oct. 15, 1935 PATENT OFFICE METAL CASTING John 1. Boat, McKeesport, Pa., asaignor to National Tube Company, a corporation of New Jersey Application April is, 1934, Serial No. 720,869

1 Claim. I (01. 22-19) This invention relates to apparatus for casting molten metal, particularly molten steel, one of the objects being to obtain better castings. Other objects may be inferred. Referring to the drawings:

Figure 1 is a sectional view showing a steel ladle, a tundish-and an ingot mold, the last element being of reduced size to conserve space in the illustration.

1 I Figure 2 is an enlarged top view of the nozzle in the tundish.

Figure 3 is a longitudinal cross-section of a different kind of nozzle which may be used in the tundish.

Figure 4 is an elevation looking in the direction of the arrows IV-IV in Figure 3. Flgm'e 5 is a top portion of this nozzle looking in the direction of the arrows V-V in Figure 4.

Figure 6 is a top view looking down in the direction of the arrows VI-VI in Figure 5.

' A conventional teeming ladle l is arranged over a tundish 2 beneath which an ingot mold 3 is positioned. The molten metal is teemed from the ladle I into the tundish 2 from which it is in turn teemed into the ingotmold 3.

The nozzle 4 of the tundish: 2 is characterized in that it consists of a refractory body through which a plurality of parallel passages i extend vfrom end to end. These passages Ii are adjacently grouped and one end of the body is shaped to provide a concave face 8 which cooperates with a stopper of suihcient size to close all of the adjacent openings to the passages 5. This stopper may be of the usual type consisting of a bar 8 surrounded by a refractory 8 and having a graphite tip ll.

Among ingot defects are blow-holes formed by included gases and surface slivers caused by metal which has splashed onto the side of the U mold during pouring.

The apparatus described converts the solid heavy stream coming from the teeming ladle I into a number of small lazy streams flowing into the ingot mold. This permits escape of some of the included gases and decreases splashing of the 1 metal as it strikes the bottom of the mold. These advantages are particularly apparent if the casting is carried out in vacuum.

In the other illustrated arrangement, the tundish 2 is provided with a diflerent teeming nozzle that consists of a refractory body ll shaped for insertion in the nozzle opening of the tundish and in whicha plurality of parallel passages l2 5 are formed. The top of this body is shaped so that the portions l3 surrounding the passages l2 extend upwardly to different heights. By this means the metal may be teemed in volumes varying acm cording to the amount of metal in the tundish. The portions II should be arranged so that rising metal in the tundish 2 will flow through one after another of the passages l2. 4

Referring more specifically to this variable volume nozzle, the portions ii of the refractory body I I are arranged so that there is a central upstanding one I! surrounding a central relatively large passage ii. A second portion ll concentrically the tundish at various heights. These passages 25 may be somewhat smaller than the central one. Although a speciflcexample of the inventionds described in accordance with the patent statutes,

it is not intended to limit the scope of theinven- 30 tion exactly thereto, except as defined by the,

following claim.

I claim:

' A teeming nozzle for molten metal, including a refractory body shaped for insertion in the nozzle opening of a tundish and having a top constructed to provide a central upstanding portion through which a passage is formed, and a second portion that concentrically surrounds said central portion and which has a sloping top edge that spirals downwardly around the same, other passages being formed through said body parallel to the first named passages so as to open into the top edge of said second portion at spaced positions, all of 'said passages being straight and opening through thebottom of said body.

. JOHN J. BOAX.