US2879565A - Double stem core chill - Google Patents

Description

March 1959 H. F. HOHLFELDER ETAL 2,879,565

DOUBLE STEM CORE CHILL 2 Sheets-Sheet 1 Filed May 14, 1957 Fig.7

Fig.6

INVENTORS. Harvey E Hoh/fe/der BY Thomas M. Reed THE/R ATTORNE rs March 31, 1 959 H. F. HOHLFELDER ET AL DOUBLE STEM com; CHILL Filed May 14, 1957 2 Sheets-Sheet v INVENTORS. Harvey Hah/fe/der Y Thomas W. Reed THE/l? A TTORNE Y5 with have also been proposed United States Patent DOUBLE STEM CORE CHILL Harvey F. Hohlfelder, Perry, and Thomas W. Reed,

Cleveland, Ohio, assignors to The F. Hohlfelder Company, Cleveland, Ohio, a corporation of Ohio Application May 14, 1957, Serial No. 658,981 2 Claims. (Cl. 22-174) forms a flush chill surface in the sand face of the core, the double stems thereof being firmly imbedded in thecore sand. After the core is positioned in the usual way in the metal receiving cavity of a mold, and as molten metal is being cast, the on the core cools at a different rate from the metal contacting the sand so as to produce the desired surface hardening or other directional heat flow required as the casting sets up.

Chill plates hitherto used in foundry practice are sometimes perforated with one or more holes for securing them to the mold core and in that manner they are nailed or otherwise secured in place by driving fasteners through those holes and into the core. Wire attachment hooks carried by the chills and like type fasteners rigid therebut the prior chills generally have been awkward to install and even then the results have not proved too satisfactory because of failure of the chill to hold in place or its failure to chill with a uniform action because of unoccupied fastener openings or other interruptions formed in the surface thereof which plug or become filled with sand.

This invention largely eliminates the foregoing difiiculties, being provided, as indicated, with double stems for solidly anchoring the opposite ends of the plate section of the chill. Further, the chill presents a full surface of chill by providing an uninterrupted or unitary plate section.

As above indicated the formed chill plate of our invention is primarily adapted to be located flush with the surface of themold core sand within themetal receiving cavity of the mold. It is apparent that the plate can be otherwise shaped and made to precisely conform with the flat-or convex or concave surfaces of other parts of the mold cavity and in generally the same manner form a highly conductive metal surface portion surrounded by the adjacent sand surface.

Further features, objects, and advantages of our invention will be apparent from the ensuing description metal that strikes the chill plate 2,879,565 Patented Mar. 31, 1959 Figures 8, 9, and 10 are similar views showing a further modification; and

Figures 11, 12, and 13 represent a steel strip in side elevation, top plan, and end elevation, respectively, illustrating various steps of fabricating the chill.

Figure 1 illustrates the application of the plate chills during a core molding operation. The mold includes a core box 10, a core pattern 12 fitting within the side walls of the core box and resting on the bottom thereof (not shown), and a sand core 14 being rammed down the slightly tapered, but. generally cylindrical bore 16 through the core pattern 12. The sand 18 of the core 14 is rammed to a certain point in the bore and an external plate chill 20 is so placed as to face outwardly against the surface of the bore and thereafter further sand is packed so as to hold the plate chill 20 captive against the sand. When the ramming is completed the tween its opposite ends so as to tions at its free ends 28,

core pattern 12 and core box 10 are inverted and then lifted away to leave the core 14 exposed, this core then being vented, sprayed, and baked hard in the usual way.

In Figures 2, 3, and 4 the plate chill 20a comprises a metal shape formed in one-piece from sheet metal and includes an elongated plate section 22 curved on the arc of a circle between its longitudinal side edges and having down-turned tabs forming stems 24 at each of the opposite ends. Each stem 24 has a bend 26 beprovide inturned porwithdrawal from the sand of the core 14. Slits 30,

coextensive with the bend radius at the base of the. stems 24 prevent the stems from interfering with the normal semi-cylindrical profile bent into the plate section 22 enabling it to have cylindrical conformity about an offset longitudinal axis of generation. This profile lies flush in each direction with the normal sand surface of the core 14 as noted in Figures 2 and 4.

In use, the plate section 22 confronts the surface 32 of the mold that the core 14 occupies and is directly exposed to the cast metal that ultimatelyoccupies the metal receiving cavity indicated at 34. In view of the fact that the diagonally bent free terminals 28 do not occupy the parallelplanes that transversely intersect the surface of the plate section 22 at its opposite ends, the chill 20a has a locked self-holding action in the core sand that resists dislodgment.

In Figures 5, 6 and 7, a modified form of plate chill 20b is shown having double stems 36 which are straight between their ends and which occupy a common plane perpendicular to the end planes at the opposite end of the surface of the plate section 20b. With respect to these latter planes which are parallel to one another, the double stems 36 have a selected angularity inwardly thereof, thus being diagonally related to one another.

and fromthe drawings forming a part of this specification and which illustrate certain preferred embodiments of our invention.

In the drawings:

Figure l is a longitudinal sectional view of our plate chill attached to the sand core in a core box;

Figures 2, 3, and 4 are views of a preferred embodiment of our invention shown in side elevation, end elevation and in perspective, respectively;

Figures 5, 6, and 7 are a similar arrangement of views but showing a modification thereof;

They are thus effective to provide a cross grip in the core sand thereby preventing dislodgment from the common mass of mold sand.

In Figures 8, 9 and 10, a modified form of chill 200 is shown having double stems 38 which occupy the parallel end planes through the surface of the plate section at its opposite ends. The stems 38 are straight between their opposite ends, but are struck from diagonally opposite ends or, the

producing a cross grip resisting v v surface of the plate sec- 11011 anda're of sufiicient length that in being turned As indicated in Figures 11, 12, and 13, a metal strip 42 is subjected to distinct operations, in the notching, slitting, forming, and blanking of, a, slightly modified form of plate chill 20d, the blank being bent or rolled to complete the article. Figure 11 shows a progressive. die type press in which the forming; tools are arranged, in tandem for concurrent operation, although other known types of machine may be employed in which turrets with a rotatable die portion below and a tool carrying turret above are used for independent successive operations as the strip is advanced. As shown, a press 44 has a fixed press bed 46 and a head 48 moving in the direction of the arrow 50 relative thereto as the strip 42 is fed through the progressive dies (not shown).

Each fresh portion of the strip 42 is first subjected to a notching operation whereby metal indicated in the dotted, hatched area 54 is relieved from the opposite edges of the strip. The notches are spaced apart providing tabs 56a captured from the. waste metal of the relieved edges.

In the first forming operation the tabs are bent at 58 between their ends and in the second forming, opera! tion, the tabs are slit at 60 and partially turned under to take the formation indicated at 56b giving suificient clearance for a press bed die to, move against the underside of the strip. In this case, the tabs are exactly transversely aligned at all times by pairs, the axis of one such pair being indicated at 62. In a cut-off and finish form operation resulting in the final plate chill 20d, the cut-off occurs along the edge 64 of the strip 42 and the opposite longitudinal edges of the short resulting strip. to form the plate section are turned downwardly to conform to the arc of a cylinder. The outside radius of bend is indicated at R in Figure 11. It is, noted that the resulting stems 56c have parallel portions between the bend 58 and the chill plate proper 20d and nonparallel free end portions which are diagonally related to the parallel portions and thus extend diagonally toward one another.

It is apparent that in the embodiment of Figure 10, the stems 38 are formed from tabs which are staggered with respect to one another on the opposite edges of the strip and that thus they do not align with one another along a common axis indicated at 62 in the embodiment of Figure 12. It is noted that the stems 38 are generally congruent to the respective parallel end planes which transversely intersect the chill surfaces at the opposite ends of the chill 20c, but that they difier in their respective angularity of intersection with planes. mutually perpendicular to said parallel planes, for instance, the vertical plane 41 in Figure 9 with which the stems 38 have angles of intersection that are exactly opposite to one another.

Following is an example of the dimensions of a plate chill made of twelve gauge metal in conformity with the foregoing embodiment of Figure 4:

Inches Outside bend radius R 9% The plate chill described in the above specific ex,- ample was formed as noted from a'shape of 12 gauge,

light metal plate for use in a particular application. It is evident that chills are made in various lengths, widths, gauges, and radii to suit the particular application desired.

The preceding embodiments of our improved chill will be noted to have double stems in all cases, these stems being diagonally related to one another in at least one sense so as to firmly cross-grip the common mass of material in which they are embedded and thus hold the chill firmly in place. The one-piece construction so as to form the complete chill from a unitary shape of sheet metal, is very attractive from a manufacturing and fabricating standpoint and the full chill surface is most advantageous in operation so as to provide uniform action.

While we have described certain presently preferred embodiments of our invention, it is to be understood that the invention may be otherwise embodied within the spirit and scope thereof.

We, claim:

1. For use in a sand mold, a generally cylindrical core of compacted sand, a one-piece two-stem chill presenting a sheet metal external chill face flush with the surface of said core at a location thereon and cylindrically bent about an inwardly offset main axis so as to precisely conform to the radius of curvature of said core at that location, and two integrally bent stems disposed one at each end of said sheet metal external face and each extending in a direction generally perpendicular thereto so asv to embed itself in the core, at least a portion of each stem extending generally diagonally with respect to a corresponding portion of the other stem to mutually provide therewith an embedded cross grip across the main dimension of the chill.

2. A method of manufacturing procedure for atlixing a double stem chill means and a packed sand core together, so as to produce cross gripping action of the stems of the former in its union with the sand being rammed in a sand core bore, said method comprising the improved steps of providing integral stems on the chill means disposed one at each end of the active chill base surface presented, and bent in the opposite general direction inwardly from said base surface in a manner whereby at least a portion of each stem extends generally References Cited in the file of this patent UNITED STATES PATENTS 2,463,147 Bumbaugh Mar. 1, 1949 2,532,302 Hayward Dec. 5, 1950 2,656,808 Plumeri et al. Oct. 27, 1953 2,731,688 Jenkins et al. Jan. 24, 1956 OTHER REFERENCES The Fanner Manufacturing Company, Cleveland, 0hio, Catalog No. 1153, 1953, pages 20 and 23 of interest.

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