US1336260A - Chill-mold - Google Patents

Description

W. H. NICHOLS.

CHILL MOLD. APPLICATION FILED AUG.18,1919.

Patented Apr. 6, 1920.

INVENTOR WL MMPQ PATENT OFFICE.

WILLIAM H. NICHOLS, 0F PITTSBURGH, PENNSYLVANIA.

Specification of Letters Patent.

Patented Apr. 6', 1920.

Application filed August 18, 1919. Serial No. 318,379.

To (all w from it may ('OflUM'i L Be it known that I, W ILLIAM H. NICHOLS, a citizen oi the United States, and resident 'r' Pittsburgh, in the county of Allegheny 1nd State of Pennsylvania, have invented a re and useful improvement in Chilli w old's; and i do hereby declare the followng to be a full, clear, and exact description ereot'. My invention relates to chill-molds for casting rolls for rolling metal.

is it isrwell known these chill-molds are made of cast iron and the chill in the castin is obtained by the contact of the hot me .il in themold with the inner walls of the mold, so that the metal "for a certain distance in is convened into a hard white iron, while the interior of the casting will have the toughness which gives it its requisite strength. When the metal is being poured into the chill the skin of the casting solidilies and the metal in the interior commences to part with its heat contracting away from the interior oi? the mold by so doing, the mold at the same time absorbing the heat e2;- pands away from the exterior of the casting. In order to prevent this too great and sudden expansion of the chill-mold, and at the same time reduce the necessity of making it so thick, water has been used for cooling the chill and for this purpose a water-jacket has been cast in the walls of the chill through which the water is caused to circulate during the casting operation. Heretofore it has been customary where a Waterjacket is used to have the chill composed of several different sections, each with its own independent water-jacket and water supply, and these sections are laid one above the other to the full height of the chill. Where the chill was built up of these sections with independent water-jackets, there was always a portion of the chill which was not subject to the cooling action 01" the water, and consequently an even chill could not be obtained,'and, furthermore, defects in the surface of the chilled roll were present at the joints between the several sections.

The object of my invention is to provide a chill-mold with a water-jacket cast integral therewith, extending continuously for the full height of the mold, and with a wall of uniform thickness so that the casting receives the same chilling 'effect throughout its entire length.

To these ends my invention comprises the novel features hereinafter set forth and claimed.

In the drawing the figure illustrated is a vertical section or". my improved chill illustrated in connection with the casting of a chilled-roll.

In the drawing the numeral 2 designates the lower box which is of the usual construction filled with sand 3 from which a wood pattern is molded which forms one of the couplings 1 and connections 5 of the roll. Supported on the box 2 is the chill 6 which is cylindrical in form and formed of cast iron. he chill 6 is cast with the waterjac :et integral therewith, and in order to form this water-jacket in the casting of the chill an annular core is supported in the mold and the metal poured around the same, whereupon after the casting is cooled the core is removed leaving the water-chamber '7 extending for practically the entire height of the chill, and with an open top which is -lose .l by the annular plate 8 secured by bolts 9 to the flange 10 0t the-chill.

The upper end of the chill is cast with the neck portion 11 which forms a ledge 12 for the plate 8. By this construction the leakage of the water into the interior of the chill is prevented as there is no joint leading to the interior wall of the chill.

The water is supplied to the water-j acket by the inlet 13 and is discharged by the outlet ll, whereby constant circulation of water is maintained.

Trunnions 15 are provided for the handling of the chill.

Resting on the upper end of the chill. is the upper box 16 likewise filled with sand and in which the other coupling and neck of the roll is cast. The customary head 1'? is provided in which the impurities of the iron which rise to the top in casting are collected.

The casting gate 18 conducts the metal to the lower end of the mold all in the ordinary manner.

hen the metal is poured into the mold and fills the same the action of the chill will be to harden or solidify the metal which comes in contact with its inner walls and the metal in the interior commences to part with its heat and contracts away from the interior of the mold as it does so. The chill under conditions where no water-cooling is employed will. become highly heated by absorbing the heat from the molten metal contained therein, and will expand away from the exterior of the casting. By circulating water through the water-jacket after this expansion of the chill is counteracted by the cooling effect of the water, so that this drawing away of the chill from the exterior of the casting is largely avoided, and,

furthermore, the thickness of the wall of the chill would not be so great as where this heat has to be absorbed by the metal of the wall.

By having the water-jacket cast integral with the. chill and extending for practically the full height of said chill, 1 obtain an even chilling effect, and all parts of the wall of the chill are equally cooled so that cracks in the roll due to unequal expansion and contraction of the walls of the chill are avoided. Furthermore, by casting the chill with a water-jacket with an open top the core may be removed without difliculty, and the centering of the core in casting can be more accurately arranged for so that an even thickness of chill-wall is obtained.

By setting the top plate 8 down on the ledge 12 at the upper end of the chill the leakage of water into the interior of the chill is prevented.

What I claim is 2- 1. A chill-mold having a water-j acket cast integral therewith forming a continuous water passage completely encircling the chill for1 substantially the entire height of said chi l.

2. A chill-mold having a water-jacket cast integral therewith forming a continuous water passage completely encircling the chill for substantially the full height of said chill, having an open top, and a cover-plate secured to said chill.

3. A chill-mold having a water-jacket cast integral therewith, forming a continuous water passage for substantially the entire height of the chill, having an open top, a neck-portion formed at the upper end of said chill forming a ledge and a cover-plate resting on said ledge secured to said chill.

In testimony whereof I, the said WILLIAM H. NIcHoLs, have hereunto set my hand.

WILLIAM H. NICHOLS.

Witnesses:

R0131. D. TOTTEN, JdHN F. WILL.

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