SU990401A1 - Core box mainly for casting blast furnace tuyeres - Google Patents

Description

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The invention relates to metallurgy and can be used in the manufacture of cores, mainly for casting tuyeres of blast furnaces,

Rod boxes are known, consisting of a body mounted on a molding plate t.

Closest to the invention to the technical essence and the achieved result is a core box containing inner and outer conical shells with ribs located along the forming working surfaces, a lid with ribs on the working surface and a pallet. To obtain a rod with a central hole, said core box between the walls has free space. The working surface of the shells can be smooth or ribbed depending on the shape requirements, the surface of the rods. In this case, the direction of the ribs coincides

With the direction of the forming surfaces, which is necessary for the free removal of the finned rod from the core box

A disadvantage of the known device is that it does not provide high quality finned rods, especially those obtained from mixtures of reduced strength.

The aim of the invention is to improve the quality of the rods.

In order to achieve this goal, in a core punch, mainly for casting tuyeres of blast furnaces, containing inner and outer conical shells with fins located along the forming working surfaces, a lid with fins on the working surface and a pallet, each of the shells is made of two coaxially installed parts , while in one of the parts along the generatrix there are slots in which the ribs located on the other part are located. 3990. FIG. 1 shows the core box, general view; in fig. 2 shows section A-A in FIG. 1 in FIG. 3 b-b section on fi 2, the core box consists of inner 1 and outer 2 conical shells, which in turn consist of finned parts 3 and respectively and parts with slots 5 and 6, respectively. The rigidity of the part of the shell with gaps is achieved by the fact that the slots do not reach the upper and lower ends of the shell, where the bars 7 and 8 remain, as well as 9 and 10 of the required thickness. A lid 11 with ribs 12 serves to form the end surface of the rod. The shells are installed on the pallet 13 with the reinforcement 1. The molding mixture, with the lid 11 removed, is sucked into the space between the shells and compacted. After completing the specified space and removing excess mold sand, a cover is inserted, which is pressed into full contact with the casings. Then, the cover and the ribbed parts of the shells are removed (outer upward and inner downward), after which the parts of the shells are removed with cracks. The rod held on the pallet 13 by means of reinforcement is fed into the drying chamber. The presence of composite shells makes it possible to eliminate the possibility of destruction of the ribbed part of the rod, since each part of the shell is removed from the rod sequentially. The ribbed part is removed first, and then the part of the shell with gaps. When removing the ribbed part of the shell, the ribs on the rod are prevented from being bridged between the gaps of another part of the shell, against which the tops of the ribs rest. The effectiveness of the proposed design, the core box, is expressed in improving the quality of the ribbed rods and the casting of tuyere parts produced using these rods. Invention Core bar, predominantly for casting tuyeres of blast furnaces, containing inner and outer conical shells with fins located along the forming working surfaces, a lid with fins on the working surface and a pallet, characterized in that, in order to improve the quality of rods, each shells are made of two coaxially mounted parts, while in one of the parts along the generatrix there are slots in which the ribs located on the other part are located. Sources of information taken into account in the examination 1.N.Titov. and Stepanov Yu.A., Foundry Technologists, M., Mechanical Engineering; 1978. with. 155. 2. USSR author's certificate №, cl. B 22 C 7 / On, 1969.

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Claims (1)

Claim The core box, mainly for casting tuyeres of blast furnaces, containing inner and outer conical shells with ribs located along the forming working surfaces, a lid with ribs on the working surface and a pallet, characterized in that, in order to improve the quality of the rods, each of the shells is made of two coaxially installed parts, while in one of the parts along the generatrix, slots are made in which ribs are located on the other part.