SU933200A1 - Mould for continuous casting of blanks - Google Patents

Description

(5) CRYSTALIZER FOR CONTINUOUS CASTING

I

The invention relates to the field of metallurgy and is intended for continuous casting of metals.

Known mold horizontal horizontal casting, having a water-cooled metal shirt and a graphite sleeve. The graphite sleeve is elongated with respect to the jacket to be cooled. The liner shank enters the internal space of the metal reservoir and is washed by the molten metal (.1.

The main disadvantages of such a mold are the low resistance of graphite sleeves and the greater labor intensity of their manufacture.

The closest to the invention to the technical essence and the achieved result is a horizontal continuous mold for casting, containing a copper water-cooled casing with a graphite sleeve inserted into it, the uncooled part of which enters the metal receiver 2.

Despite the fact that the liner is made of special high-density fine-grained graphite, its durability remains insufficiently high. In addition, graphite is an expensive and scarce material. A large contact thermal resistance between the sleeve and the jacket leads to a decrease in the productivity of the casting process. To reduce contact

To thermal resistance between the sleeve and the jacket, they are matched on a conic surface, and the contact surfaces are machined to ensure minimal roughness. The process of driving and assembling molds is a very responsible and time-consuming operation.

The aim of the invention is to increase the durability of the mold.

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Claims (1)

The goal is achieved by the fact that in a continuous casting mold for workpieces containing a cooled and non-cooled zone, with a combined sleeve, having an inner working layer of wear-resistant material and a cooled outer metal sheath, the sleeve is made reinforced and contains an intermediate layer of low-heat-conductive material located on the site, the length of which is 0.5-1.5 the length of the uncooled zone of the mold, the intermediate layer is made of alumina. FIG. 1 shows the proposed mold, a longitudinal section; in fig. 2 — node 1 in FIG. 1. The crystal / gator has a cooled 1 and uncooled 2 zones. The combined mold sleeve contains an inner working layer 3, a cooled outer metal sheath C and an intermediate layer 5 of low heat conducting material. The outer metal shell C is made along the entire length of the mold. The mold sleeve is reinforced with pins 6 and wire 7, welded together. The pins 6 are poured into the outer metal shell of the crystallizer C. The wire 7 is welded on to the inner working layer 3 and poured into the outer metal sheath 4. The mold works as follows. A part of the uncooled zone 2 of the mold is inserted into a meta-receiver And, under the influence of the melt, it is heated to a high temperature, which prevents solidification of the metal in this area. As you move away from the metal receiver, the temperature of the working layer of the liner decreases, and the melt cools with greater intensity, which leads to the formation of an initial crust. Such crystallizers have several advantages. In particular, there is no need to use connecting refractory cups, which simplifies the design of the continuous casting plant and ensures the elimination of the characteristic defects of castings - ring nespai (cut-offs). Radial and axial temperature differences cause thermal deformations and stresses in the sleeve. At the same time, the inner working 3 and intermediate 5 layers are subjected to the action of compressive stresses, and the 9 external metallic sheath k of tensile stress is cooled. The lite outer shell C has a high tensile strength and serves to ensure the strength and rigidity of the mold. The intermediate layer 5 creates a large thermal resistance and reduces the amount of heat flow in the uncooled zone 2 of the mold. The reinforcing elements in the form of pins 6 and wires 7 create a rigid framework and strengthen the mold sleeve. Solid lubricant containing in the inner working layer 3 reduces the stretching force of the casting and its erosion effect on layer 3. Example. The mold for continuous horizontal casting of cast iron billets with a diameter of 60 mm is made with cooled and cooled areas, the length of which is 200 and 80 mm, respectively. The sleeve with a wall thickness of 15 mm contains a working 3 mm of nickel with a depth of 3 cub. graphite. An intermediate 9 mm and 8 mm long layer is made of alumina by plasma spraying. Cooled copper shell flooded over the entire length of the mold. The sleeve is reinforced with molybdenum pins with a density of one pin per wire with a diameter of 0.5 mm. The presence of wear-resistant working insulating intermediate and hardening outer layers, as well as the reinforcement of the multi-layer mold of the mold increases its wear resistance and rigidity. Increasing the durability of the mold improves labor productivity, creates opportunities for more complete use of the advantages of continuous casting, and also contributes to the expansion of its use in the national economy. Claim 1. A mold continuous casting mold comprising a cooled and non-cooled zone, with a combined sleeve having an inner working layer of wear-resistant material and an outer cooled metal shell, characterized in that