US2832113A - Ingot mold - Google Patents

Description

April 29, 1958 A. J. MANGOLD, JR., ETAL INGoT MOLD Filed April 2v, 1954 INGOT MOLD Anthony J. Mangold, Jr., Delhi Township, Hamilton County, James W. Mahafey, Harrison, and Stanton 1,. Reese, Cincinnati, Ohio, assignors to the United States of America as represented by the United States Atomic Energy Commission Application April 27, 1954, Serial No. 426,057

1 Claim. (Cl. 22-148) This invention relates to ingot-mold assemblies and more particularly to those in which the bottom of the mold consists of a plug inserted into an opening in the lower part of the mold body.

It is desirable that the ingot be formed in the mold free of surface defects or tins which may cause damage to the mold during the removal of the ingot from the mold. Damaged surfaces of the mold cavity cause imperfect surfaces and lins to be cast into succeeding ingots. These defects cast into the ingots in turn cause further mold damage with each successive ingot removed from the mold, and after a relatively few cycles, the mold produces an ingot having such coarse surfaces that the mold must be broken in order to remove the ingot. Mold assemblies of the present kind invariably have a crevice, formed by the junction of the bottom plug and the mold body; this crevice gives rise to a fin on the ingot. In the present invention the mold body and bottom plug are so shaped that the ingot n formed about the bottom plug of the mold will not cause damage to the mold when the ingot is removed. Also, the ingot formed in the improved mold of the present invention is shaped to enter the blooming mill rolls easily and with a minimum tendency to expand laterally, or mushroom This latter property of the rolled ingotcast in the improved mold assembly of the present invention minimizes the quantity of scrap material formed from shearing the rolled metal into strips preparatory to its use in inal fabrication.

Further advantages of the invention will become apparent upon examination of the specification and atl" tached drawing. Y

The single figure in the drawing is a longitudinal crosssection of the mold assembly of the present invention. This assembly includes a hollow mold body which has a cavity 11 extending the greater portion of the i length of the body and opening at one end 12 thereof. A recess 13 extends from the other end 14 of the body toward the cavity 11, but not the full distance to the cavity 11. The recess 13 consists of a portion 15 which is smaller in cross-section than cavity 11, is spaced from the end 14, and extends longitudinally approximately half the length of the recess 13, and a portion 16 which is larger in cross-section than the interior portion, and extends from the interior portion to the end 14 of the body 10. A cavity 17 having tapered sides extends from the inner end of the cavity 11 to the inner end of the recess portion 15. An interior shoulder 18, which connects the recess portions 15 and 16, faces toward the end 14 of the cylinder and is spaced therefrom.

I Patented Apr. 29, 1958 ICC The cross-sections of the cavities 11 and 17 and the recess 13 may be circular. The wall surfaces of the cavities 11 and 17 and the recess 13 must be smooth and free of defects. The cavity 11 should be of generally uniform size throughout its length, although it may taper slightly so as to have a smaller end adjacent the cavity 17 so that removal of the ingot is facilitated. The portions 15 and 16 of the recess 13 should be of generally uniform size throughout their lengths.

rlille mold assembly also includes a plug member 19 which consists of an upper portion 20 which is shaped to lit into the inner portion 15 of the recess 13 and a lower portion 21 which is shaped to fit into the` outer portion 16 of recess 13. The two portions 20 and 21 of the plug 19 are separated by an external shoulder 22 formed in the mid-region of the plug 19.

The lower portion 21 of the plug is longer than the outer portion 16 of the recess 13, and when the plug 19 is positioned within the recess 13 so that the internal shoulder 18 of the recess 13 and the external shoulder 22 of the plug are juxtaposed, the lower portion 21 of the plug extends below the bottom of the body 10. The upper portion 2t) of the plug is the same: length as the inner portion 15 of the recess 13, and when the plug 19 is positioned as indicated above within the recess 13, the upper surface 23 of the plug reaches to the junction between the tapered cavity 17 and the recess 13.

The plug 19 has a recessed cavity 24 extending from the plug surface 23 to a point in the plug below the plane of the shoulder 22. The cavity 24 may be circular in cross-section, of generally uniform size throughout its length, and have a plane end 25 Within the interior of the plug.

Preparatory to receiving the molten metal, the mold is assembled by positioning the plug 19 in the recess 13 of the body 10 and is placed in an upright position on a support, not shown, so that a bottom surface 26 of the plug 19 rests on the support and the weight of the body 1d is carried through the plug 19. This assures that the shoulder 18 of the body and the shoulder 22 of the plug 19 will be in engagement and the upper end 23 of the plug 19 will be at the junction of the cavity 17 and the recess 13.

Molten metal is poured into the top opening at the end 12 of the body 10. When the ingot is cooled, the mold assembly may be lifted and the plug 19 removed. The shape of the mold cavities as herein described precludes the formation of iins or other surface irregularities which will damage the smooth interior surfaces of the mold cavities during removal of the ingot. No horizontal n is formed on the ingot. The fin that may develop will be vertical and will be located at the vertical surfaces of contact between the inner recess portion 15 of the mold body 1t) and the small portion 20 of the plug 19. Such a vertical fin will inflict no damage on the mold body 1t) when the ingot is being removed.

The plug 19 is protected from breakage at the juncture of the portions 21 and 22, since this juncture lies well within the mold body 10 when the plug is inserted in the mold body.

The contour of the ingot formed by the tapered cavity 17 and the recess 24 in the plug 19 facilitates entry of the ingot in the blooming mill and prevents the tendency of the ingot to mushroom in the blooming mill.

aesaiis It will be understood that this invention is not to be limited to the details given herein but that it may be modified within the scope of the appended claim.

What is claimed is:

An ingot-mold assembly comprising a body having a cavity and a recess extending through the bottom of the body from the cavity, the recess having an internal shoulder facing downward and being spaced from the cavity and the bottom of the mold; and a plug tting the recess and having an external shoulder in engagement with the internal shoulder of the recess, the plug extending above the said shoulders and below the bottom of the body.

References Cited in the le of this patent UNITED STATES PATENTS

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