US1393666A - Chill-mold - Google Patents

Description

FRANK CORDES, OF PITTSBURGH, PENNSYLVAIA.

CHILL-MOLD.

*v-q Specation of Letters Patent.

Patented Oct. 11, 1921.

.Application filed December 27, 1920. Serial No. 433,107.

To all 'La/tom t may concern.'

Be it .known that I, F RANK Corinne, a citizen of the United States, residing at Pittsbui-gh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvement in Chill-Molds, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specication, in which z- Figure l is a plan view of a mold chill embodying my invention.

Fig. 2 is a transverse verticalsection of a chill mold embodying my invention.

Fig. 3 is a detail view looking at the inner face of a portion of one of the moldV sections and showing a modification.

My invention has relation to chill molds, and more particularly to that type of such molds in which the inner portion of the mold, which is in contact with the articles cast therein, is formed of a plurality of separated tongues or segments which facilitate the expansion and contraction of the mold in a well known manner. My invention is designed to provide a novel construction and arrangement of these tongues or segments. The invention is particularly useful in connection with molds for casting chill rolls, but may be used for other purposes.

Referring to the accompanying drawings, the numeral 2 designates one of the mold sections provided with the usual lifting trunnions A number of these mold sections or chills are superimposed to form a mold of the desired height according to the length of the roll which is to be cast.

The inner portion ofeach mold section or chill is formed by a plurality of radial tongues or segments 4, which are separated from cach other by the narrow slots or silts 5. In accordance with my invention, these slots or slits, instead of extending in a direction parallel to the vertical axis of the mold, are arranged obliquely, as clearly shown in Fig. 2. Preferably, the slots or slits are so arranged that when a number of mold sections or chills are superimposed, as shown in Fig. 2, the slots or slits of adjacent mold sections or chills will be in staggered relation to each other. The slots or slits, instead of extending in oblique straight lines may extend in oblique curved lines, as shown at 6 in Fig. 3.

The oblique arrangement of the slots or slits gives a number of important advantages, which may be stated as follows.

In cast-ing lwith molds of this character, cracks often occur, these cracks generally running in lines which are substantially parallel to the vertical axis of the roll or other article being cast. The provision of vertical slots or slits tends to induce the formation of such cracks. By arranging the slots or slits obliquely, the tendency to crack is largely overcome, since the slots or slits are in a direction which constantly diverges from any point where the cracks tend to start. The staggered arrangement, as shown in Fig. 2, also further reduce the liability to cracking, since the lines formed by the slots are broken at each mold section.

The oblique arrangement also facilitates free venting of the mold as the molten metal in iowing into the mold is constantly passing the openings formed by the slots. Where the slots are vertically arranged, the metal must How the full length of the chill or mold section to a joint between yadjacent sections, in order to vent freely.

In the use of molds of this general character provided with vertical tongues, markings are left on the metal sheets which pass through the cast rolls. This is due to the fact that the metal at the slits or slots between the tongues, whether the latter are lilled with some composition such as blacking and molasses, or are unfilled, solidiies differently from that part cast in direct contact with the metal of the mold, which results in there being formed in the cast rolls longitudinally extending portions of the metal which have a different form of crystallization than the remaining metal. Where these portions extend longitudinally of the rolls, the impress or markings upon the sheets passing through the rolls extend transversely of the sheets andare difficult to entirely remove by the cold rolling method of finishing. Where the slits or slots extend obliquely in accordance with my invention, the corresponding markings upon the metal sheets also extend obliquely and are much more easily obliterated in the cold rolling operation.

It is also a matter of considerable difficulty to properly turn rolls which are cast in chill molds having the vertical slits or slots, owing to the fact that the mold markings upon the rolls are presented squarely to the bite of the cutting tools. By arranging I have hereiny shown and the slots obliquely, the roll markings are pre sented obliquely to the cutting tools, which greatly facilitates the operation. rlhere is a similar advantage in turning the inside of the mold chills or sections, due to my invention.

In the use of rolls made in chill molds, the

diilerence in the structureof metal atpor-y tions thcreoi1 corresponding to the slots or slits between the tongues causes the rolls to grip the sheet more firmly at these portions. `Where the slots are vertically Y- arranged, these points oi? maximum contact with the sheet are intermittent. With the oblique arrangement of the slots, these portions ot the rolls are in constant contact with the sheet, thus giving the rolls a greater and more even pull on the metal being rolled.

I do not limit myseliI to the particular arrangements of the oblique slots or slits which described, since these may be modified Without departing from the spirit and scope of my invention as defined in the appended claims.

I claim: v

i l. A mold chill consisting of an annular ring having its chilling surface divided into connected sections separatedby slots or slits,

said slots or slits extending obliquely across the inner face of the chill and said inner face forming the outer Wall." of the mold, subi stantially as described.

2. A chill mold comprising a plurality of superimposed mold sections or chills, each of said sections or chills having its' inner chilling, portion divided into a plurality of radial tongues or segments integrally united at their bases to the body of the chill and separated by slots or slits, said slots or slits extending in an oblique direction with respect tothe vertical axis of the mold, substantially as described. Y 3. VA chill mold comprising a plurality of superimposed mold sections or chills, each ot said sections or chills having its inner chilling portion divided into a plurality of radial tongues or segments separated by slots or slits, said slots or slits extending in an oblique direction With respect to the vertical axis of the mold, and adjacent mold sectionsor chills having the slots or slits staggered With respect to each other,'snb stantially asrdescribed. Y

In testimony whereof, l have hereunto set my hand.v v Y FRANK CORDES.

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