US2864142A - Foundry chill plate - Google Patents

Description

Dec 16, 1958 w. L. JENKINS FOUNDRY CHILL PLATE Filed June 18, 1952 FIG. B

FIG. 8

FEG. H

IN V EN TOR.

S m N m E J M R m A United States Patent 6 FOUNDRY CHILL PLATE Wendell L. Jenkins, Canton, Ohio, assignor to The Vf.(I).l.fiJenkins :Company, Canton, Ohio, a corporation 0 Application June 18, 1952, Serial No. 294,203

3 Claims. (Cl. 22-183) speed up the cooling of the molten metal at certain locations where the cooling rate would otherwise be slow due to the configuration of the mold cavity, or where a relatively rapid cooling is required to produce desired conditions, thus preventing the occurrence of cracks and other defects in the casting at those locations. Such .chill plates are made in various shapes including radius chills having a transverse curvature which may be concave or convex for fitting complementary curved surfaces in the mold cavity.

Conventional chill plates are provided with holes at spaced points for receiving nails which extend into the sand and serve to anchor the chill plate in place as the metal is poured, and this method of anchoring chill plates is shown in Patent No. 2,231,703, issued February 11, 1941, to W. T. Clark. Additional nails are usually inserted at each end of the chill to prevent it from getting out of position or out of alignment.

The use of nails for anchoring chill plates not only requires punching holes in the chill plate, but also requires the additional operation of inserting the nails through the holes, and usually additional nails at the ends of the plate to keep it in position, which themolder is likely to forget to do, and as a consequence the chill plate is not properly anchored when the molten metal is poured and the casting may be ruined. Moreover, when the nails are inserted, the molder frequently applies excessive or unequal pressure at different points, causing the chill to become cocked out of position or alignment in the sand, resulting in rough projections or pockets in the surface of the finished casting, which requires additional filing or grinding operations to make the casting acceptable. Excessive or unequal pressures are particularly apt to be applied to chill plates which are rammed into the cope side of the mold or core and the only means holding them in place are the nails projecting upwardly into the sand.

It is very important that chill plates be provided with a series of vent holes to provide for elimination of gases and steam at the surfaces of the mold cavity where the chills are located, because otherwise roughness, pin holes" and other defects occur at those points. Accordingly, conventional .chill plates are provided with vent holes in addition to the nail holes, thus adding to the cost of producing the chill plates.

It is an object of the present invention to provide a novel chill plate having integral anchoring projections which cannot become detached and overlooked. and which are bent angularly from the plate to provide vent openings therein, thus eliminating the necessity of punch- "ice ing. nail holes in the plate and the operation of inserting nails to anchor the plate in the mold.

Another object is to provide a novel chill plate which is quickly and easily set into place in the sand, and which is automatically locked in position when set.

A further object is to provide a novel chill plate which overcomes the disadvantages of prior constructions, and is simple and inexpensive to manufacture, and easily positioned accurately in the mold.

, These and other objects are accomplished by the improved construction comprising the invention, preferred embodiments of which are shown and described herein as exemplifying the best known mode of carrying out the invention, and the scope of the invention being defined in the appended claims.

Referring to the drawings:

Fig. 1 is a plan view of one embodiment of the novel chill plate;

Fig. 2 is an end elevation thereof;

Fig. 3 is a plan view of another embodiment;

Fig. 4 is an end elevation thereof;

Fig, 5 is a plan view of another modification;

Fig. 6 is an elevation thereof; 1

Fig. 7 is a longitudinal section on line 77, Fig. 1;

Fig. 8 is a longitudinal section on line 88, Fig. 2;

Fig. '9 is a longitudinal section on line 9-9, Fig. 5;

Fig. 10 is a fragmentary sectional view through a sand mold showing the manner of use of the novel chill plate, the embodiments of Figs. 3 and 5 being illustrated; and

Fig. 11 is afragmentary sectional view, as on line 1111, Fig. 10.

The embodiments of the invention shown in the drawings are conventionally known as radius chills and are commonly used in molds or cores where curved surfaces or fillets are formed in the casting. However, these chill plates may be used at any desired location in a mold cavity where it is desired to speed up the cooling and solidification of the metal and to prevent the formation of defects in the casting. Moreover, the particular transverse contour of the chill plates may be varied to suit requirements and may be flat.

The .chill plate 12 shown in Figs. 1, 2 and 7 has a uniform transverse curvature throughout its length, and longitudinally spaced prongs or projections 13 are struck or punched out of the central portion of the strip. The prongs 13 are preferably slightly tapered and their ends may be somewhat pointed, and in this form they extend at right angles to the concaveside' of the strip forming slightly tapered vent openings 14 through the strip. When the pointed ends of the prongs 13 are forced into the sand the convex side 15 is the front side or surface which is exposed to the molten metal in the mold.

The strip 12a which is shown in Figs. 3, 4 and 8 is transversely curved similarly to the strip 12, and has longitudinally spaced tapered prongs 13a punched out of its central portion and extending rearwardly from the concave side of the strip forming tapered vent openings 14a. In this embodiment, however, the prongs or projections 13a are inclined to the longitudinal central portion of the strip so that they extend rearwardly therefrom at acute angles rather than at right angles as in the strip 12. As shown in Fig. 8, the prongs 13a are preferably bent out from the strip in opposite directions at angles of about 60, although these angles may be varied as desired.

An important feature is to have the prongs bent at less than right angles to the strip so that when the prongs are pushed into the sand of the mold or core they lock or anchor into the sand because of their inclination to the strip and because they are inclined in opposite directions. The oppositely inclined prongs are particularly advantageous when used on the cope side of the mold or core because they can be set in position with moderate pressure to position the outer surface of the chill properly relative to the mold surface, and yet are firmly locked into the sand. p

The strip 12b shown in Figs. 5, 6 and 9 is transversely curved similarly to the strip 12a, but the longitudinally spaced tapered prongs 1312, which are punched out of the strip to form tapered vent openings 14b, extend rear- Wardly from the convex side of the strip at acute angles thereto. Thus the concave side of the strip becomes the front side or surface which is exposed in the mold when the prongs are forced into the sand. As shown in Fig. 9,

the prongs 13b are oppositely inclined at acute angles of about 60 with the mold so as to lock into the sand firmly and securely. For convenience, all of the chill plates 12, 12a and 12b are shown as relatively short, with a pair of prongs projecting angularly therefrom, but it will be understood that within the scope of the invention the length may be varied to suit requirements and a series of prongs punched out of the strip at regular intervals. It may be desirable for the manufacturer to furnish a wide variety of sizes and shapes, all having the novel integral prongs forming a series of vent openings in the chill plate.

In Figs. 10 and 11, chill plates 12a and 12b are shown positioned respectively in convexly and concavely curved corners of a sand mold 15, a plurality of the plates being positioned end to and along the corners, to promote relatively rapid cooling of the casting in those corner portions. As shown in Fig. 11, when the prongs 13a are rammed into the sand, or the sand is rammed around the prongs because of their inclination in opposite directions they are firmly locked or anchored in the sand so as to prevent shifting of the chill plate in any direction, and there is no necessity of inserting additional anchors at the ends of the plates, as is the case with nails. If the plates are used on the cope side of a mold or core so that they are inverted, this locking feature is still more important because it prevents the chills from dropping out of position, and enables ramming them into position with less force. As a result there is less likelihood of the chills being cocked out of position or alignment when the molten metal is poured, which would cause projections or pockets in the surface of the finished casting and require additional grinding or filing.

In all forms of the invention, the angularly bent prongs are punched out of the metal of the strip and provide vent openings of substantial area at regular intervals along the length of the strip, permitting ample opportunity for the escape of steam and gases generated during the casting operation, without requiring any additional vent holes to be punched in the strip. The prongs are easily punched and bent out from the metal in a simple and inexpensive operation, and being integral with the strip cannot become lost or forgotten by the molder as in the case of nails; and moreover the additional operation .4 of inserting the nails in holes in the strip or at the ends of the strip is eliminated.

The length and contour of the novel chill plates can be varied substantially to complement various mold contours, without affecting the manner of forming or the construction of the prongs extending angularly from the plates. Moreover, the angles between the prongs and the chill plate can be varied within the scope of the invention defined in the appended claims.

What is claimed is:

1. In combination with a sand mold having a contoured surface forming at least part of a mold cavity for casting molten metal, a chill plate comprising an elongated strip of metal formed transversely to fit a portion of said contoured surface, said strip having a pair of longitudinally spaced prongs bent out of the strip along its median portion extending into the sand and forming vent openings through the median portion of the strip, and said prongs being inclined longitudinally in opposite directions at an acute angle with the strip to lock said chill plate in the compacted sand of the mold.

2. In combination with a sand mold having a contoured surface forming at least part of a mold cavity for casting molten metal, a chill plate comprising an elongated strip of metal curved transversely to fit a portion of said contoured surface, said strip having a pair of longitudinally spaced prongs bent out at the strip along its median portion extending from the concave side into the sand and forming vent openings through the median portion of the strip, and said prongs being inclined longitudinally in opposite directions at an acute angle with the strip to lock said chill plate in the compacted sand of the mold.

3. In combination with a sand mold having a contoured surface forming at least part of a mold cavity for casting molten metal, a chill plate comprising an elongated strip of metal curved transversely to fit a portion of said contoured surface, said strip having a pair of longitudinally spaced prongs bent out of the strip along its median portion extending from the convex side into the sand and forming vent openings through the median portion of the strip, and said prongs being inclined longitudinally in opposite directions at an acute angle with the strip to lock said chill plate in the compacted sand of the mold.

References Cited in the file of this patent UNITED STATES PATENTS 766,257 Ianes Aug. 2, 1904 935,978 Haskins Oct. 5, 1909 1,540,551 Evans June 2, 1925 1,877,049 Raible Sept. 13, 1932 2,141,946 Batcheller et al Dec. 27, 1938 2,214,939 Stirn Sept. 17, 1940 2,231,703 Clark Feb. 11, 1941

Images