Method with glass as covering heat preservation agent for vacuum nickel ingot casting and special mould
A technology of vacuum casting and thermal insulation agent, applied in the field of casting, can solve the problems of fast heating and low yield of ingots, and achieve the effects of increasing yield, prolonging solidification time, and improving internal quality
Active Publication Date: 2013-12-04
BAOJI HAI JI TITANIUM & NICKL
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Problems solved by technology
Since the heat at the top of the metal liquid is lost quickly due to thermal radiation when casting in a vacuum state, it is impossible to supplement the heat with a riser heating agent in a vacuum state, and it is common that the upper part of the insulation cap is cooled and solidified first, and the shrinkage cavity formed It is often located between the insulation cap and the ingot mold, and the yield of the ingot is low. Therefore, it is necessary to find a more effective vacuum method
Method used
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Embodiment Construction
[0019] Combine below figure 1 An embodiment of the present invention is described.
[0020] The vacuum pouring nickel ingot uses glass as the method for covering insulating agent, comprises the following steps:
[0021] 1) Put 99.96% electrolytic nickel plate into the crucible of vacuum induction melting furnace;
[0022] 2) Put the special mold with the glass ring on the inner wall into the mold base of the vacuum induction melting furnace; The upper part is fixed with a glass ring 3, and the inner diameter of the thermal insulation cap is smaller than the inner diameter of the mold;
[0023] 3) Close the vacuum induction melting furnace and evacuate to no more than 10Pa;
[0024] 4) Turn on the intermediate frequency power supply and start smelting. After the electrolytic nickel plate is melted, continue to heat to 1520°C and refine for 30 minutes;
[0025] 5) Pour the nickel metal liquid refined in the crucible into a special mold, and as the liquid level of the nickel ...
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The invention provides a method with glass as covering heat preservation agent for vacuum nickel ingot casting and a special mould. A glass ring is additionally arranged on the inner wall of a mould body, during the process of nickel ingot casting, the glass ring is melted by pouring liquid and floats on the liquid level of the nickel ingot casting pouring liquid, heat preservation effect is achieved on nickel metal liquid below, heat radiation on the surface of the nickel metal liquid is lowered, setting time of the metal liquid in a heat preservation cap is prolonged, so that the position of a finished product nickel ingot casting contraction hole is lifted to the top, finished product rate of nickel ingot casting is improved, and high practicability is achieved.
Description
technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for vacuum casting nickel ingots and using glass as a covering heat insulating agent and a special mold. Background technique [0002] Nickel is a rare metal, which is easily oxidized at high temperature, and smelting in the atmosphere is not conducive to the discharge of gas contained in the raw material. Therefore, when making nickel ingots, it needs to be carried out in a vacuum induction melting furnace. Since the heat at the top of the metal liquid is lost quickly due to thermal radiation when casting in a vacuum state, it is impossible to supplement the heat with a riser heating agent in a vacuum state, and it is common that the upper part of the insulation cap is cooled and solidified first, and the shrinkage cavity formed It is often between the insulation cap and the ingot mold, and the yield of the ingot is low. Therefore, it is necessary to find a ...
Claims
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IPC IPC(8): B22D7/12B22D7/06
Inventor 高骏高盼
Owner BAOJI HAI JI TITANIUM & NICKL