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Dummy head for semi-continuous casting

A dummy head and semi-continuous technology, which is applied in the field of dummy tools, can solve the problems of increased solidification speed difference, affecting the service life of ingots, and large cooling rate differences, so as to reduce the cooling rate difference, reduce segregation, The effect of reducing thermal stress

Inactive Publication Date: 2017-11-17
HUNAN INT ECONOMICS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solidification temperature field in the conventional semi-continuous casting crystallizer is determined by the cooling system of the casting machine. Generally, primary and secondary cooling are used, but they are all cooled from the periphery of the ingot, which leads to the solidification of the edge of the ingot and the central part of the ingot. The difference in solidification speed increases, and the larger the size of the ingot, the more obvious the uneven solidification. The uneven cooling rate between the middle and the edge of the metal solution will cause greater thermal stress, which will easily lead to deformation of the ingot and reduce the pass rate. Affect the quality of the ingot
At the same time, due to the large difference between the internal and external cooling rates, segregation of the ingot occurs, which affects the service life of the ingot

Method used

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  • Dummy head for semi-continuous casting
  • Dummy head for semi-continuous casting
  • Dummy head for semi-continuous casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preferred embodiment one, such as figure 1 , figure 2 As shown, the dummy head for continuous casting disclosed in this embodiment includes a disc-shaped tray body 1 , a heat pipe row 2 and two oppositely arranged semicircular fin skirts 3 .

[0028] The bottom surface of the inner chamber of the disc-shaped tray body 1 is a convex quadric surface (which can be a hyperboloid, a paraboloid or an ellipsoid), and the highest point of the curved surface is located on the axial centerline of the disc-shaped tray body 1 . Disc-shaped tray body 1 is provided with drainage holes 11, and heat pipe row 2 includes a plurality of inorganic superconducting heat pipes 21 that are radially embedded in the bottom surface of the inner cavity of tray body 1. The evaporation ends of each inorganic superconducting heat pipe 21 are Towards the axial center of the tray body 1 , the condensation end is located outside the side wall of the tray body 1 . The semicircular fin skirt 3 is provi...

Embodiment 2

[0031] Preferred embodiment two, such as Figure 4 , Figure 5 As shown, the difference between the dummy head for continuous casting disclosed in this embodiment and the preferred embodiment 1 is that the tray body is a rectangular tray body 10, and the bottom surface of the inner cavity of the rectangular tray body 10 is processed symmetrically with four curved surfaces. The vertices of the curved surfaces coincide and are located directly above the geometric center of the bottom surface of the rectangular tray body 10 , and the inorganic superconducting heat pipes 21 are connected to a pair of side walls of the rectangular tray body 10 in parallel and vertically. The condensation end of the inorganic superconducting heat pipe 21 is covered with a rectangular fin skirt 30 for heat dissipation, and the rectangular fin skirt 30 is provided with a water hole 8 corresponding to the area between two inorganic superconducting heat pipes 21 . Other structures and usage methods of ...

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Abstract

The invention discloses a dummy bar head applied to semi-continuous casting. The dummy bar head comprises a tray body, wherein the bottom surface of an inner chamber of the tray body is a convex surface; a heat conducting component is arranged on the tray body. The bottom surface of the inner chamber of the tray body is designed to be a curved surface which is raised from the side to the middle, so that the cooling rate of the middle parts of cast ingots is increased; meanwhile, the heat conducting component is arranged on the tray body, so that the cooling rate of the middle parts of the cast ingots is further improved; the cooling rate difference between the middle parts and the exterior parts of the cast ingots is reduced; the heat stress caused by unevenly cooling is reduced; the segregation phenomena are reduced; high deformation generated in the forming process of the cast ingots is avoided; the qualification rate of the cast ingots is improved; the quality of the cast ingots is ensured; the service life of the cast ingots is prolonged.

Description

technical field [0001] The invention relates to a dummy tool, in particular to a dummy head for semi-continuous casting. Background technique [0002] The dummy mechanism is one of the important devices for semi-continuous melting and casting of metals. A dummy bar consists of a dummy head, a transition piece and a shaft. Before pouring, the dummy head and some transition pieces enter the mold to form the movable "inner bottom" of the mold. After the pouring starts, the molten metal solidifies and condenses with the dummy head, and the dummy is pulled by the dummy rod mechanism The rod continuously pulls the strand out of the mold. This is the effect and function of the conventional semi-continuous casting dummy device. [0003] The initial stage of the metal semi-continuous casting process is the most unstable stage in the whole casting process, and casting problems such as leakage and ingot cracking are prone to occur. Especially for alloys with a wide solidification t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/08
CPCB22D11/081
Inventor 陈健美
Owner HUNAN INT ECONOMICS UNIV