US966306A - Mold for brass castings. - Google Patents

Description

' F. E. BROWN. MOLD FOB. BRASS GASTINGS. APPLQIOATION FILED DEC. 29, 1-909.

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MOLD FOR BRASS GASTINGS. APPLIUATIDN FILED DEC. 29, 1909. 966930fio V Patnted'Aug. 2; 1910.

" REDERICK E. BROWNJOF WINONA, MINNESOTA.

HOLD FOR BRASS CASTINGS.

Application filed December 29, 1909. Serial No. 535,529.

To all whom it may concern:

Be it known that I, FREDERICK E. Buown, of W mona, Winona county, Minnesota, have invented certain new and useful Improve ments in lrtolds tor Brass Castings, of which the following is a specification.

The object of my invention is to provide a metallic mold in which brass castings can be molde l, and particularly the journal brasses used in car axle bearing boxes. ln molds heretofore employed for casting these brasscs. the gate leads into the bottom of the mold, the riser and vent being at the top. It has been found that metal poured in this way will fail to rise and completely till the mold or will settle or shrink, leaving holes or depressions in the casting.

The primary] object of my invention, therefore, is to locate the gate at such a point in the mold that the complete filling of the mold with the molten metal will be assured.

'A further object is to provide imprmed means for forming sockets or recesses in the casting wherein the Babbitt metal will be locked.

My invention consists generally in a mold having a gate and riser in its upper end.

Further the invention consists in enlarging the gate and riser to form chaml'iers or recesses therein. wherein a supply of the molten metal will collect.

Further the invention consists in blocks removably mounted in one, section of the mold and adapted to-t'orm sockets or recesses inthe casting.

Further the invention consists in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification, Figure 1 is a vertical sectional view of a moldembodying my invention, Fig. 2 is a transverse sectional View of the mold on the line mw of Fig. 1. Fig. 3 is a vertical sectional view of the mold on the line i ---g of Fig. 1. Fig. 4 is a view of the lower end of the mold, Fig. 5 is an edge view, Fig. (3 is a top View, Fig. 7 is" a sectional view of. one portion of the mold, Fig. 8 is a similar View of the other portion, Fig. 9 is a sectional view illustrating the nianner of removing the blocks from the cirsting, Fig. 10 is a view of the completed axle brass.

Specification of Letters Patent.

Patented Aug. 2, ioie.

In the drawing, 2 represents one portion or section of the mold and 3 the other section, adapted to be placed together to form the mold preparatory to casting. The section 3 has a recess 4 therein and the section 2 has a longitudinally arranged bar 5 adapted to pro ect into the recess t and having openings (3 on each side provided with tapered side walls in which blOCl-SS 7-are inserted and provided with mchned faces 8 which proicct Into the recess 4, said faces termination in a series of lon itudinall aru i h ranged lips 9, formed by a corresponding number of grooves or recesses 10. The inner curved surface of the bar 5 merges into the walls of the recess 10 on one side, as indicated in Fin. 2. so that the lips 5) project. inwardly into the recess 4 beyond the bar These blocks 7 are, as stated, removable with the casting from the mold and when the casting is formed. the molten metal will flow into the. recess 10 forming. when the blocks are removed. as indicated in Fig.9, a series oi lit'tle pockets ll in the (tasting l2. 'lhcsc pockets will receive the Babbitt metal and lock it securely in the bearing brass and render it unnecessary to drill holcs in the brass or provide any other means for locking the Babbitt metal therein. The blocks are readily removed from the casting when it is taken-out. ot' the mold. as indicated in.

Fig. 9, the taper ot' the blocks allowing their ready removal from the mold section 2. It will be noted, however, that the taper of the blocks and the walls on which they bear, prevent outward movement under the pressure of the molten metal. As shown in Fig. 1, the blocks 7 are locatedon each side of the longitudinal center of the mold cavity, so

that a series of pocketswill be formed in the brass on each side of its longitudinal cen ter, and as these pockets extend trans- .verscly in theicasting, it is evident, that the collect, flowing therefrom through the lower portion of the sprue into the mold, and insuring a continuous flow of the molten metal into themold until it is completely filled. A riser 17 is also provided in the corresponding end of the mold, having a spherical chamber 19 and a recess 20 at its outer end, corresponding substantially to the chamber 15. This riser may fill with the molten metal and also has a chamber 19 accommodating a considerable body of it and insuring the perfect formation of the upper end of the casting. A vent hold 21 is provided intermediate to the sprue and riser and side vents 22 extend from the interior of the mold out throu h-the walls thereof.

Each section of the mold has a handle 23, for convenience in setting up and separating the mold sections.

In using the mold, the metal is poured into the chamber 15 and flowing down through the sprue into the mold, will fill the lower end thereof, and as the metal rises in the mold its weight will foroe the lower portion to flow mto all the recesses and corners and insure aperfect casting. The metal, having once reached the lower end of the mold and filled the cavity, does not move thereafter and may be cooled rapidly, and this may continue until the mold is entirely filled, the metal remainin in very nearly the same position in the mol that it occupies when it drops from the sprue. This I have found to be a very much more satisfactory method of casting brass than where the sprue leads iiito the bottom of the mold, for inthat case the metal is compelled to rise in the mold from the bottom to the top and as it cools rapidly, it often does not fill all the cavities therein, and the weight of the metal in the mold has a tendency to retard the fiow through the sprue. All this difiiculty is avoided by pouring into the top. The metal will drop directly to the bottom of the mold, filling all the recesses and depressions therein, and mounting gradually toward the sprue until the mold is completely filled. The chamber 16 will fill up with molten metal, furnishing a supply to the mold as it cools and shrinks. The chamber 19 in the riser will have a similar function. whemtherefore, the sections'of the mold are separated, a perfect casting will be found, from which it is only necessary to remove theblocks 7, re place them in the mold section and repeat the operation.

This mold, with suitable modifications, is also adapted for use in casting the brasses for driving boxes where great trouble'is experienced owing to the shrinkage of the metal in the casting.

The mold is preferably made of a mixture of of soft iron and 30% of steel. I have found that this proportion used in the manufacture of the metallic mold will render it very much more durable I have also ound that a percentage of steel mixed with the iron in the mold will make the walls of the mold of finer grain and produce a casting with a smoother surface than has been possible to obtain heretofore with the ordinary iron mold.

I claim as my invention:

1. A. mold for brass castings comprising sections adapted, when placed together, to form a cavity, a gate having a sprue leading to said cavity, and said gate having a chamber provided with a flat bottom and communicatin at one end with the sprue.

2. Amold or brass castings, comprising metallic sections adapted, when placed together, to form a cavity, a gate having a sprue formed in the metal sections leading to said cavity, and a reservoir. chamber formed in said mold intermediate'in the ends quantity of molten metal.

3. A mold comprising sections having a cavity therein, a block removably mounted in one of said sections and rejecting into said cavity and havin lips" ormed thereon at intervals on each si e of the ion itudinal center of said cavity, whereby poo ets will be formed in the casting.

posed of sections forming a cavit therein When placed together, one, of sai sections having a longitudinal bar and openings on each side thereof and blocks fitting within said openings and'having means preventing their outward movement, said blocks projecting into said cavity and having lips formed theredn, whereby pockets or depressions will be formed in the curved surface of the brass and said blocks being removable with'the brass from said mold, substantially as described.

5. A mold for journal box brasses com posed of sections forming a cavity therein when placed together, blocks having tapered surfaces fitting within sockets in one of said sections and projectim into said cavity, said blocks having inclined surfaces and one of said sections having a curved surface between said blocks, and said curved surface .and the inclined surfaces of said blocks forming the wall of the mold for the inner "curved. surface of the bearing brass, and said blocks having means thereon to form pockets or depressions in the brass, for 't'he purpose specified. I

6. A metallic mold composed of amixture of soft iron and steel in the proportion of steel.

7. A metallic mold comprising sections adapted when placed together to form a cavity between them, a gate and. a 'riser iki than one com osed entirely of iron andof said sprue and adapted to contain a 4. A: mold for journal box brasses com- 7 its substantially two parts of iron to 'oneof swam Iocafied in one exgd of said mold and having In witness whereof, I have hefeunto set sprues I commumcat'mg with said cavity, my hand this 22nd day of October 1909. said sprues being comparatively small in cross section and havmg' reservoirs formed FREDERICK BROWN 5 therein intermediate to their ends and Witnesses:

adapted to contain a quantit of molten L. G. CROWN metal, for the purpose specified i J. A. Bymamn.

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