SU33049A1 - The method of reinforcing bronze liners with steel - Google Patents

Description

When reinforcing brbnzovyh inserts by pouring them into a shell of steel, iron or other metal of increased strength, the success of the case, in the sense of achieving close welding without mixing both metals, mainly depends on the method of forming and casting.

Gates should be made, arranged and designed so that the half of the liner, molded into the core (bump), is covered by a shell of melted steel as instantly as possible, i.e. approximately simultaneously and evenly at all points and that shrinkage and tightening efforts in the sprues contributed to the welding of the liner with the shell.

With a conventional device and the arrangement of gates in the form of a tube cut from above or on the side, due to the slow rise of liquid steel, the liner material would completely melt and mix in the bottom of the steel with steel, and even the surface melt of the bronze liner would occur in the upper part near the edges and welding to the steel sheath, but a gap would appear between them, since the sheathing force would not be enough for welding. Even the device of several sprues,

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filling the form from different sides and consisting of stacked channels, the set goal does not reach, since the embedding of the liner also does not occur immediately, but as it rises (liquid steel from the bottom.

At the faKoro kind of sprues location, the metal cooling in the channels could not be produced, due to the shrinkage required for welding, to tighten the shell and liner. It is just as difficult to expect this from the location of the channels, in which the individual branches, during cooling, tend to unbend the shell and bend inside the liner cast at the same time or just before that. Through the proposed method it is intended to achieve a successful army; inserts, which is possible only with an instant and approximately uniform coating of the liner with a steel shell at all points and such an arrangement of the sprues, at which the cooling of the steel springs occurs during the cooling of the sprues.

In the drawing, FIG. 1 shows a molded shape in a longitudinal section, FIG. 2 is the same, top view, FIG. 3 is a cross-section of the flask with the liner installed in it, serving as the lower part of the core, and FIG. 4-cross section of a bronze insert with a spacer inserted into it.

The method of reinforcing bronze inserts with steel is that the sprues consist of a number of branch channels 3 of large cross-section, located directly above the inserts and designed in such a way that the channels 8 located above the two walls of the insert form a pair of pairs of staples, which during cooling and shrinkage shrinks the shell and thus contribute to a closer connection with the liner 5.

The success of instantaneous and uniform casting everywhere is due to the fact that: liquid steel in contact with the employee core, cold deposits: this rapidly cools over the entire contact surface like a chill mold, thereby forming a solid, enveloping liner, a strong steel crust. It is only after the formation of this steel crust, due to the heat transfer by the steel mass, that the heating of the liner is so strong that it partially or completely melts. However, the mixing of steel with bronze cannot occur due to the surrounding liner of the previously hardened steel crust; on the contrary, under the action of shrinkage pressures in the hardening steel shell 4, reinforced by the tightening forces of the hardening system of the gating channels, the required close uniform welding of both metals is achieved.

Successful reinforcement of liners by welding them with steel sheath

4can be achieved only in the case when a sufficiently strong welding pressure due to shrinkage of the steel shell and the sprue system also acts on the walls of the liner. This pressure edge 7 liner

They themselves provide sufficient resistance even when sand is located behind them, although under the action of steel heated to high temperatures they soften and even melt, and are provided with hanging, undercut clipped protrusions serving as white metal. ramming

Kening sand cores (cones) of the most various types, sleep $ zhenny5zh both inside and outside by the tokens, in itself: it is known. These; foals in the famous The constructions MUST serve either to increase the rigidity of the core itself, or to pass through the form through the outer walls and serve to fix the position of cepj 5e4HHKa.

In the case we are talking about a special kind of internal strengthening of the core. Here, a part of the core is made of a thin-walled bronze insert, the outer surface of which must be welded with a more refractory metal and the edges of which protrude upwards must be poured into steel at the end. Here, the stiffness-enhancing means pursue, therefore, a special purpose: to protect these protruding edges from bending and to ensure proper welding of the liner right up to the edges. The rim 7 of the liner is respectively raised to achieve a closer and more perfect weld, the liner with the steel sheath.

As spacers 6, simple non-stiff and incompressible rods c. this case is not suitable, since the full stiffness of the spacer would entail the breaking of the steel shell, which is subject to shrinkage. For this, spacers are provided in the form of metal strips or bows.

Instead of bronze and steel, this method can also be used to weld other alloys that are used to make liners and that need reinforcement with high-strength metal.

The subject of the patent.

 The method of reinforcing bronze inserts with steel, characterized in that in order to achieve the fullest possible welding of the insert with the steel shell, the sprue is made in the form, along the form, of channel 3 with transverse, covering the form like staples, with channels 8, and the insert itself is elastic or springs c; their struts b. to the patent of the in-th firm “Iron and steel plants of Walter Peynngauz D1 33049

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