Sequential solidification technology device and method used in vacuum smelting equipment

Abstract

The invention discloses a sequential solidification technology device and method used in vacuum smelting equipment. An induction heating coil is placed in a dead head section of an ingot die, and the feeding capacity of metal liquid in a dead head is enhanced through an induction heating method; a bottom cooling device with the cooling area smaller than the area of the cross section, at the bottom position of the ingot die, of a casting is arranged at the bottom of an ingot die base, the solid-liquid interface angle is reduced, and the metal liquid in the ingot die after pouring can be sequentially solidified from bottom to top. The solidification process control method is applicable to production of metal bar castings in the vacuum smelting equipment. Through the sequential solidification technology device and method, macroshrinkage and shrinkage porosity in alloy bar castings can be eliminated, the casting quality and the technology yield are improved, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of casting equipment and methods, more particularly, to a sequential solidification process device and method used in vacuum smelting equipment. Background technique [0002] In the production process of ultra-high temperature materials, in order to ensure that the produced materials have an excellent quality level, it is necessary to strictly control the chemical composition and improve the purity, which mainly depends on the melting technology. Vacuum melting technology is a key technology for ultra-high temperature material melting. [0003] During the casting process of the alloy liquid, when the solution is poured into the ingot mold, the liquid in contact with the wall of the ingot model solidifies first, and the liquid in the center part solidifies later. Due to the liquid shrinkage and solidification shrinkage of the alloy, voids often appear in the part of the casting that solidifies last. Large a...

AI Technical Summary

Problems solved by technology

[0005] In order to increase the solid-liquid interface angle as much as possible, in the traditional process, a certain temperature gradient is added to the molten metal by adding water cooling or air cooling to the side or bottom of the ingot mould, so as to accelerate the cooling of the molten metal. Solidification, but for the method of applying side cooling, the first thing to cool is the side wall of the ingot mold, which can only reduce the total solidification time, and does not help the expansion of the solid-liquid interface angle, and will even further reduce the solid-liquid interface angle

As for the bottom cooling method, it is often through cooling all areas of the bottom, which will not only increase the longitudinal solidification speed of the center of the bar, but also cool the side wall of the ingot mold, increase the transverse solidification speed of the bar, and affect the solid-liquid interface angle. The expansion effect is not obvious

[0006] It can be seen that no one has announced the sequential solidification process device and method used in vacuum smelting equipment based on the riser heating design and cold iron feeding design.

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