US1883382A - Ingot mold - Google Patents

Description

A. B. KINZEL oct'. 1s, 1932.

INGOT MOLD Filed Oct. 27, 1930 6 zzV/VENTOR;

A Troie/v5 Ys.

Patented Oct. 18, 1932 UNITED STATES PA'TEN'E OFFICE AUGUSTUS B. KINZEL, OF BEECHHUIRST, NEW YORK, ASSIGNOR TO ELECTRO METAL- LURGICAL COMPANY, A. CORPORATION OF WEST VIRGINIA meer Mori) Application filed Uctober 27, 1930. Serial No. 491,489.

This invention relates to molds for casting ingots, and has application to a particular typeof improved ingot mold especially 'adapted for casting so-called piping steels.

Due to the natural shrinkage of molten metal while cooling in a mold, many diiculties are encountered in attempting to form sound steel ingots. Among the most coinmon defects is that caused by piping. This consists in the formation of cavities -or fissures within the interior of the ingot. The surfaces of these cavities usually become oxi,- dized, and if the ingot is worked without removing them, defects will appear in the finished steel. Vith the usual forni of ingot mold it is impossible to control the particular point within the ingot where the pipe may occur although itis usually found in the upper portion. It is therefore customary to cut off and discard that section of the ingot containing any pipe, before subsequently working it. In most instances this results in a waste of a considerable portion of the ingot.

An object of my invention is to provide an improved ingot mold having means therein vfor confining or concentrating the shrinkage cavities to a comparatively small portion of the ingot, which portion is so defined as to permit its easy removal and produce a greater yield of sound workable metal.

The advantages of my mold will be evident `from a description of the accompanying drawing illustrating one form of a suitable Aingot mold embodying the invention.

Fig. 1 is a vertical cross section through the center of the mold.

Fig. 2 is a section on the line II.-II of Fig. 1.

In the modification shown the outer wall 2 of the mold is substantially square in cross section and tapered toward the top. This wall resembles in shape the common form of ingot mold, and is preferably-made of cast iron. The four vertical dividing walls 3 eX- tend the entire length of the ingot. Each side of the outer wall carries one inner vertical wall which is centrally disposed thereon and extends toward the cent-er of the mold. The inner walls are detachably mounted to the outer walls by means of the rods 4 and the nuts 5, the rods 4 being connected with the reinforcing members 6. The material of the walls 3 should have less heat conducting capacity than the outer cast iron walls. I pre- It will be noted that there is a free and unl obstructed central opening running through-- out the entire length of the mold. The molten metal is introduced into t-lie mold with'the dividing walls in the position shown, and, as the metal cools, the shrinkage cavities are confined to the open central portion of the ingot mold. After the metal has solidified the central section of the ingot is so delined that 1 t may be easily separated from the rest of the ingot by breaking or cutting oli' the outer portions to provide four sound blocks of steel. Thus the amount of steel wasted through discarding this comparatively small center portion is much less than when large portions of the entire end of the ingot are removed, as is customary in normal practice for obtaining sound steel.

As previously stated the inner vertical walls are constructed of a material which is a poor conductor of heat. They, therefore, conduct very little heat away from the metal in the center of the mold, but rather act to cause that portion of the'metal to remain molten longer than the rest. Since the pipe usually forms in that part of the metal which is the last to freeze, these inner walls act to confine the pipe formation in the open central portion of the ingot. In the particular posi# tion shown they also providey four sound blocks of steel, substantially square in cross section and of suitable shape for rolling.

Materials other than the one mentioned may be used for forming the inner vertical walls, and various other modifications may also-be made, especially with regard to the outer shape of the mold and the particular positioning of the inner walls, without departing from the spirit of my invention.

I claim:

1. A. mold for casting ingots comprisin an outer wall and a plurality of vertlcal d1- vidin walls of low heat conducting material exten in inward from said outer walls toward t e center of the mold.

2. A mold for casting ingots comprisin an outer substantially rectangular wall, an a plurality of vertical dividing walls of low heat conducting material on said outer wall Y extending inwardly toward the center of the mold, but spaced therefrom to form an unobstructed central section throughout the entire length of the mold.

3. A mold for casting ingots comprising an outer wall substantially square in cross section, having a, vertical dividing wall of low heat conducting material centrally dis osed and detachably mounted on each side o said outer wall, said dividing Walls extending inwardly toward the center of the mold but terminating short thereof.

4. A mold for casting steel ingots com rising `an outer cast iron wall substantiall square in cross section, having a vertical d1- vldin wall of low heat conducting refractory materlal centrally disposed and detachably mounted on each side of said outer wall, said dividing walls extending inwardly toward the center of the mold but terminating short thereof to provide an unobstructed central section throughout the entire length of the mold whereby shrinkage cavities within the ingot are confined to that portion within said unobstructed central section'of the mold.

In testimony whereof, I aix my signature.

AUGUSTUSl B. IUNZEL.

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