US3076240A - Radius chill - Google Patents

Description

5. N. SCHLEIN Feb. 5, 1963 RADIUS CHILL Filed June 10, 1960 INVENT OR. Seymoa 1Y- S h/e1 1 HIS ATTORNEY United States Patent Island Filed June 10, 1960, Ser. No. 35,371 1 Claim. (Cl. 22--174) This invention relates to chills and more particularly to a foundry chill of the so-called external radius type.

As is well known to those versed in the art, metal chills are frequently used in molds to chill the metal at points where the metal is slow to chill and thus equalize the cooling process through the casting to thus avoid cracks due to uneven cooling. It is also common :to provide what is known as an external radius chill, that is, one that does not merge with the casting and which is used particularly to chill inside corners of the castings.

Since the mold, which makes an inside corner, is necessarily provided with a complementary outside corner, when it is desired to supply a chill, the chill has been placed on the outside corner and held in place by nails inserted through the chill into the sand forming the corner. Althoughnsome external radius chills are provided with integral stems, the holding power of these was not too good because it was impractical to provide enough stems and further because there was not enough of a body of sand at this point.

The chills with the holes provided several disadvantages among which were the fact that the insertion of the nails disturbed the sand in the mold. Furthermore, if all the nail holes were not used, the metal would run into the holes sometimes even fusing with the chill. This required that the chill be chipped off of the casting, leaving a rough surface on the casting and increasing the cost due to labor necessary to smooth the casting at that point. r

The chills having the integral stems were expensive to make because they had to be cast. These with attached stems were expensive to make because the stems had to be attached separately. The cast chill-s also provided a rough surface, which did not allow the chills to be readily or easily separated from the casting and also provide a rough surface on the casting.

One of the greatest disadvantages resided in the fact that chills with stems whether they be nails or integral stems provided a natural cleavage plane for the sand which caused the sand to break, especially on the outside corners and the chill to fall off after the mold was assembled.

By my present invention, I have provided a rolled steel chill having a means for holding it in the sand which not only does not break up the sand but actually causes the outside sand corners to be substantially reinforced. A rolled steel chill has the further advantage that the chilling surface can be made very smooth, eliminating the need for subsequent machining operation.

Furthermore, by my method of manufacture I can not only make the chills better, but faster and materially cheaper than previous chills.

Still other advantages of the invention and the invention itself will become more apparent from the following description of an embodiment thereof which is i1- lu-strated by the accompanying drawings and forms a part of this specification.

In the drawings:

FIG. 1 is an isometric view of a chill of my invention;

FIG. 2 is a cross sectional view of a chill at one stage of its manufacture;

FIG. 3 is a cross sectional view of a chi-ll at the stage of FIG. 2, showing a modification thereof;

3,076,240 Patented Feb. 5., 1963 FIG. 4 is a cross section of the chill of FIG. 2. after final formation; and

FIG. 5 is an isometric view of a modification thereof.

In the drawings like parts have been designated by like reference characters.

Briefly, the invention constitutes rolling a strip of metal into channel formation having a pair of parallel legs, one on each edge of the channel, and then forming the channel shaped strip to a radius transversely of the strip.

As best shown in FIGS. 2 and 3, a strip of metal of the desired structure is formed, preferably by rolling to provide a body 10- and a pair of marginal anges 11, which extend from each side of the body. It will be appreciated that rolling is preferred since it causes the stock to have a smooth surface, which is particularly desirable on the outer face. The rolling may be effected in roller dies, at which time the flanges 11 are also fiormed. It will be noted that the flanges are tapered, becoming thinner toward their outer edges.

After the stock is rolled, it may be severed into the desired lengths. The short lengths are then placed in a bending machine and bent to the shape shown in FIG. 4. The bending may be effected in many ways such as by dies or by subjecting the edges and the center line to pressure to cause the pieces to bow outward.

Preferably the bending is such as to bring the legs inward on a radial angle to the circumference.

It will be appreciated that the curvature can be varied by more or less bending as desired.

As shown in FIG. 4, the stock may be made in various thicknesses, that of FIG. 1 being for a Ms" thick body and FIG. 4 being a A thick body. It is also contemplated that bodies -7 thick will be made.

In use, the chill is placed in the core box in the desired position, and the sand is blown into the core box and is packed in on the concave side and between the legs. Usually the legs are completely embedded in the sand.

With the legs embedded in the sand and the outer convex surface forming the corner of the mold, the corners of the sand are reinforced, the legs or flanges gripping the sand for the complete length of the chill. During operation the reinforcement for the corner also prevents the corner from being washed away by the molten metal.

Due to the smoothness of the chill, the chill does not ad here to the casting. Since there are no holes in the chill, there is an even chilling of the metaland the metal does not enter into the holes and require a subsequent chipping or grinding operation.

It will be apparent that the manufacturing of the chill is much cheaper because there are only a rolling and a bending operation and no waste metal from the operation is realized. It is also possible to make the parts much faster and without the need for expensive machinery.

FIG. 5 illustrates a modification of the chill wherein the flanges or legs :11 have been omitted from the sides and end flanges 15 are provided which may extend into the sand.

In this instance the body would be rolled first and then the flanges 15 provided by bending over the ends. As in the other embodiments, the sand packs into the interior or hollow surfaces.

Having thus described my invention in an embodiment thereof, I am aware that numerous and extensive departures may be made therefrom without departing from the spirit of the invention as defined in the appended claim.

I claim:

A chill comprising a body of semi-cylindrical formation on the exterior and interior surface, retaining References Cited in the file of this patent UNITED STATES PATENTS 1,618,016 Leek Feb. 15, 1927 4 Norton Dec. 5, 1933 Jenkins Ian. 24, 1956 Toulrnin July 16, 1957 Holfelder et a1. Mar. 31, 1959

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