US2621382A

US2621382A - Pattern for horizontal casting systems

Info

Publication number: US2621382A
Application number: US160205A
Authority: US
Inventors: William H Johnson
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-05-05
Filing date: 1950-05-05
Publication date: 1952-12-16
Anticipated expiration: 1969-12-16

Description

Dec. 16, 1952 w JQHNSQN 2,621,382

PATTERN FOR HORIZONTAL CASTINGSYSTEHS Filed May 5. 1950 INVENTOR I WILLIAM H. JOHNSON Patented Dec. 16, 1952 UNITED STATES PATENT O'FFIC'E PATTERN FOR HORIZONTAL LCASTING -SYSTEMS 'William, H. Johnson, Washington, D; C.

ApplicationMay5, 1950, -Serial No. 169,205

- 4 Claims. (Cl. 221 57 .(JGrantedrunder the act of vMarch 3,'1 8l'3 3,.-as amended Aprjilfii), 19218; 37010.. G. 757) systems or, the invention.

Horizontal casting of metal as commonly ,ear-

-.ried.out in the foundry involves a system including a straight runner,,; to which is connecteda series of horizontally arranged conduits, called :finger-gates-which lead into the casting mold or cavity. The sprue may: feed .to .the-end. or. center :of the runner which is of the conventionally larger ,sizejand equal incross-section to the; sprue. The larger size I runner provides, adequate volume jinzthe runner for fiow 10f the'metallequallysto all of th finger gates. The art has worked to attain smooth, quiet, uniform flow through ;all the :finger gates but experience has shownthis desirable result to'be seldom obtained. With the use of:a runnerand fingergatesof the conventional largersize, the metal generally tends toflow more copiously through someof-the finger gates than others with resulting uneven .fiow of the metal into the mold. This uneven fiow of the metal develops local areas of turbulence in the casting moldv with theresult that the slag is driven into the body of the castin making itan uneconomical operation to remove it. Desirably, the slag should lie on the surface of the casting where it can easily be machined out. If on the other'hand, the finger gates are made small enough. in cross-sectionto obtain uniform fiow therethrough, the metal ispropelled into ;the casting. mold under terrific jet action which develops .a large. degree of turbulence in the mold giving rise to sand erosion and possible poor surface appearance of the casting.

It is an object of the present invention to provide an improved system for the pouring of metal in horizontal casting.

It is a further object of the invention to provide an improved system for the pouring of metal in horizontal casting in which smooth, quiet uniform flow of the metal through all of the finger gates can be obtained without the necessity of resorting to finger gates of small area or cross-section.

It is another object of the invention to provide pattern plates from which can be molded foundry forms embodying the new pouring systems of the invention.

Other objects of the invention will become apparent from the description thereof which follows:

Briefly-stated, Ihave:foundthatmetalscan be induced-to flow through all;..the fin er ates in .a smooth, quiet uniformgmanner tothecasting mold of a horizontal casting system, withthe advantages, or materially reducing turbulence in the mold, by providingaln;comoination,;asplitstream runner of Vrshapewitn whichisiczon- 'nected four finger gates prequel QIOSStSQQUiQII which leadto thecasfingmol orca i y.

Inanother aspect;v Of my invention. I have-pro.- vided pattern plates-from which. 1. the usual way, can be. molded .iouodry. forms -zwhi.ch..em-

body the newapouringsystems. -flihese .pattern plates carry: .on:.a broad ;face; thereof a raised design or the. new pouringsystems, j.the;,-rais.ed design taking, tne former a,.$er 1eSf0f interconnected bosses corresponding to the. severahlements of the pourin system.

The split-stream runner is constituted; by;. a pair of diverging arms each onwhieh isconnected with a pair of finger gates ofBquaLcross-section which, in proximity to the castingfiavityormoid, are parallel and equi-spaced. The diverging arms are set at ,an angle to. each other or .between about 40 and about 50%, preferably atan angle of about .45.". Thegouter one of;.each ,-,pair

of finger gates extends. outwardly from :therespective divergent .arm at @an angle; thereto.,.of 225 and, after extending a substantialand equal distance from the end of the respective divergent arm, is rebent inwardly through an .angle of so as to enter the castin moldin parallelism with the companion .inner 'finger gatewhichex.- tends outwardly from the nivergent arrntat an angle thereto equal to that ma e by the-.outer finger gate therewith. :Each of the pdiverging arms of-therunner hasv a ,cross-sectional...area equal to thatof. the sum-of .the .crossesectional areas of the .two finger gates:attachedthereto. The runner is fed at. the apex-of the two diverging arms by means of the usual sprue which is of a cross-sectional area equal tothat of one of the diverging arms.

In another aspect of my invention, I have provided plates for the new pouring systems from which, in the usual way, can be molded foundry in which like parts carry like numerals and in which:

Figure 1 is a perspective view of a pattern plate carrying a raised design of an improved pouring system of the invention, and

Figure 1A is a schematic showing, in operative set up with a casting mold or cavity, of the improved pouring system forming the subject matter for the pattern plate of Figure 1.

Referring to Figure 1A, the usual sprue (not shown) leads to the split-stream runner I having divergent arms 2 and 3 set apart at an angle of 45. A series of four finger gates are shown at 4, 5, 6 and l, of which the outer finger gates 4 and I are connected with arms 2 and 3, respectively, at an angle of 225 and at an equal distance from the ends of the respective arms are rebent through an angle of 45 so as to be in parallelism with

inner finger gates

5 and 8 which are connected at an angle of 22.5 with the arms 2 and 3 respectively. The finger gates in their parallel relationship are equi-spaced and lead into the casting mold or cavity, shown at 8 in conventionalized form.

In operation of the pouring system in Figure 1A, a metal, for example, steel, is poured into the sprue and enters the runner l at the apex thereof. At this point the stream of metal is split and flows through each of the divergin arms 2 and 3 to the respective pairs of

finger gates

4, 5 and 6, l. The flow through the finger gates to the casting mold 8 is accomplished in a quiet, smooth, uniform manner.

In Figure 1, pattern plate 9 is shown provided with a raised design of the pouring system of Figure 1A. The raised design is constituted by a series of connected bosses which correspond to the elements of the pouring system and are identified by the like numerals. The pattern plates may be made of wood, metal or other suitable material and the raised design provided thereon in known manner.

Since various modifications and changes may be made in the invention without departing from the spirit or scope thereof, it is not intended that it shall be limited to the herein described specific embodiments thereof but only as is required by the appended claims.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

What is claimed is:

1. A pattern plate for molding foundry pouring forms having a horizontal V-shaped runner fed at the apex thereof, said pattern plate having attached thereto on a broad face thereof a system of bosses of generally rectangular crosssection having the upper edges thereof rounded 01f. said system of bosses including a V-shaped boss having arms of equal length and cross-sectional area which diverge at an angle of between about 40 and a pair of bosses branching from the end of each of said divergent arms, each of the bosses of said pairs being of a crosssectional area equal to half that of the divergent arm and extending from the end of the latter at an angle of about 22.5", the inner boss of each of said pairs being a straight boss and extending parallel to each other and the outer boss of each of the same extending outwardly from the respective divergent arm for a substantial and equal distance and thence being turned inwardly through an angle of about 45 to extend parallel to its companion inner boss.

2. A pattern plate as defined in claim 1, wherein the arms of the V-shaped boss diverge at an angle of about 45.

3. A pattern for molding foundry forms having a horizontal V-shaped runner fed at the apex thereof, said pattern comprising a system of fiat-bottomed bars of generally rectangular cross-section having their upper edges rounded off, said system of bars having the flat bottom surface of the bars lying in a common plane and including a V-shaped bar having arms of equal length and cross-sectional area which diverge at an angle of between about 40 and 50, a pair of bars branching from the end of each of said divergent arms, each of the bars of said pairs being of a cross-sectional area equal to half that of the divergent arm and extending from the end of the latter at an angle of about 225, the inner bar of each of said pairs being a straight bar and extending parallel to each other and the outer bar of each of the same extending outwardly from the respective divergent arm for a substantial and equal distance and thence being turned inwardly through an angle of about 45 to extend parallel to its companion inner bar.

4. A pattern as defined in claim 3, wherein the arms of the V-shaped bar diverge at an angle of about 45.

WILLIAM H. JOHNSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 520,101 Adams May 22, 1894 1,410,775 Thomes Mar. 28, 1922 1,758,114 Kadow May 13, 1930 2,529,647 Arnette Nov. 14, 1950 OTHER REFERENCES The Foundry, October 1948, pages 68-73, inclusive, and 252.