US2045681A - Metal pot for matrix composing and line casting machines - Google Patents

Description

June 30', 1936. Q A, ALBRECHT V N METAL POT FOR MATRIX COMPOSING AND LINE CASTING MACHINES Filed Feb. 14, 1934 Patented June 30, 1936 METAL POT FOR MATRIX CODIPOSING AND LINE CASTING MACHINES Brooklyn, N. Y.

Application February 14, 1934, Serial No. 711,120 In Germany September 29, 1933 2 Claims.

In matrix composing and line casting machines, it is known for the metal required for the casting of the lines, to be melted in a pot from which, after passing through a delivery throat, it is forced into the casting moldlby means of a pump. As the delivery throat is comparatively long, there is a risk of the metal becoming too cool during its passage through it. For preventing this cooling, the delivery throat is provided with a separate heating arrangement. There is, however, some difficulty in controlling and maintaining proper relationship between the heating of the delivery throat and metal pot; further the arrangement of separate heating elements for the delivery throat is also somewhat troublesome.

The present invention overcomes these disadvantages by the fact that, by an appropriate conformation of the metal pot, the delivery throat is located entirely or mainly within it, so as to be enveloped on all sides by the molten metal. This ensures that the temperature of the delivery throat will always be the same as that of the molten metal, and consequently the metal will not cool off within the delivery throat. Further, the entrance of the delivery throat is so curved or rounded that the metal, on entering, will meet with little or inappreciable resistance, its passage through the delivery throat being thus accelerated as compared with other constructions, and cooling off thereby further prevented. Finally, according to the invention, the production of porous slugs will be avoided by the pump plunger, which is formed hollow, being provided at the top with an inclined cover extending upwardly to a point close to the pump rod. This prevents dross, which may lie. on top of the molten metal and sometimes gets into the pump cylinder, from remaining in the latter, as it will fall off the plunger cover.

The drawing illustrates by way of example one constructional form of the invention; in the said drawing:-

Figure 1 is a section through the metal pot, showing the plunger at the beginning of the metal-ejecting stroke;

Figure 2 is a similar view, showing the plunger at the end of the metal-ejecting stroke, and

Figure 3 is a view similar to Figure 1, but of a different constructional form.

In the drawing a is the metal pot, in which the metal to be used for slug-casting, is melted by a heating arrangement not illustrated. Any desired heating means may be adopted. Inside the metal pot is located the pump cylinder bin which.

the pump plunger is reciprocated. The plunger a is formed hollow and closed at the bottom. It is traversed by a rod or link (1 pivotally connected to the floor of the plunger, and actuated in Wellknown manner by a pump lever e. According to the invention, the plunger is provided at the top with a cover I tapering towards a central opening which leaves only just sufficient space to permit the rod d to move freely therein. The cover is preferably of partial cone-shape, but it may be either concavo-convex, or of stepped formation. If, as may happen when the level of the metal in the pot is high, dross or metal should get into the pump cylinder when the plunger occupies the lowermost position in which it is shown in Figure 2, this metal or dross will be collected in the cylinder above the cover 1 and when the plunger next rises to the position in which it is shown in Figure 1, it will fall into the metal pot and thus be prevented from entering the cylinder beneath the plunger or forced into the casting mold. No metal or impurities can therefore find their way into the hollow plunger itself and cause trouble by impeding the operation of the pivotal joint, between the plunger c and the rod (1.

In the alternative constructional form of the invention illustrated in Figure 3, the pump cylinder is formed by a sleeve g which is inserted in a socket h formed in the metal pot. In other respects this constructional form is identical with that previously described.

The metal is forced into the mold by the plunger through the delivery throat i and the mouthpiece 10. In order to facilitate the passage of the metal from the pump cylinder b into the delivery throat i, the upper wall of that throat at the point at which it joins the pump cylinder is curved or rounded as shown at m.

The delivery throat i is so disposed inside the metal pot a that it is surrounded on all sides by molten metal. Whilst in the constructions heretofore employed the lower wall of the delivery throat has been constituted by the wall of the metal pot, the metal pot in this improved construction is provided with an enlarged section 11,, in which there is contained molten metal lying beneath the underside of the delivery throat. Consequently, the delivery throat will be just as hot as the metal itself and any cooling of the metal will be avoided so that a separate heating arrangement is rendered unnecessary, because the greater part of the delivery throat is located within the metal pot, and only a small portion thereof extending towards the mold, lies outside said metal pot.

Having described my invention, I declare that what I claim and desire to secure by Letters Patent is:-- e

1. A pump plunger for the metal pots of matrix composing and line casting machines, comprising a substantially closed hollow piston provided with an upper well formed to permit free movement of the plunger rod and yet cleave and shed metal dross when the upper end of the piston is raised above the level of metal in the pot.

2. A pump plunger for metal pots of matrix composing and line casting machines, comprising a, hollow piston provided at its upper end with a eover'whicl; tgpen upwardly towards the center and is p eferab y of part al con -s ap CHRISTIAN AUGUSTUS ALBRECHT.

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