Apparatus and method for directional solidification
阅读：261发布：2021-09-21
专利汇可以提供Apparatus and method for directional solidification专利检索，专利查询，专利分析的服务。并且Control of manufacture of individual directionally solidified articles is provided by an improved apparatus, an important feature of which is a two-chamber vacuum casting furnace including a pair of cooperating chill members, a first being mounted in an upper chamber and a second being movable with a casting mold. Heating means applies heat to develop a plurality of heating zones within the furnace. The method practiced involves removing heat from metal in the mold initially predominantly through the first chill member and then through both chill members which are diverging one from the other. One chill member removes heat through the base of the casting being solidified while the other removes heat through the lateral walls of the casting predominantly at the liquid-solid interface traversing the solidifying casting.，下面是Apparatus and method for directional solidification专利的具体信息内容。
1. In a method for directionally solidifying an article in a casting furnace from a molten metal cast into a casting mold having a mold foot and outer lateral walls, wherein heat is first removed from the molten metal through cooling means connected with the mold foot and then heat is removed concurrently through the mold foot and the lateral walls by causing relative motion between the mold and a chill member to move a solidifying metal zone through the mold, the chill member having a central opening defined by a chill wall and a chill top surface; the improvement comprising, in combination, the steps of: providing the chill member with a chill wall and the casting mold with an outer lateral wall, each of said walls configured to be closely adjacent one to the other during the relative motion between the mold and the chill member, with the chill wall circumferentially disposed about the outer lateral wall, the lateral wall enclosing a single article casting chamber communicating with the mold foot; causing molten metal to be deposited in the casting chamber with the mold foot closely adjacent the chill wall at the chill top surface; while at the same time, applying a first amount of heat selectively toward the mold outer lateral wall in a first furnace area immediately above the chill top surface to heat the wall when in the first area sufficiently to maintain the metal in substantially the molten state; and concurrently, applying a second amount of heat, less than the first amount but sufficient to maintain the metal in substantially the molten state, selectively toward the mold outer lateral wall when in a second furnace area above the first area; while, removing heat from the metal progressively during relative motion between the mold and the chill member through the means connected with the mold foot and through the chill wall at a rate sufficient to substantially solidify the metal as it traverses adjacent the chill top surface.
2. The method of claim 1, for use with a casting mold of the self-casting type having a top portion adapted to hold a solid metal charge, in which: the molten metal charge is deposited in the casting chamber by applying concurrently with the first and the second amounts of heat, a third amount of heat in a third furnace area toward the mold top portion holding the solid metal charge, the third amount of heat being greater than the second amount and less than the first amount but sufficient to melt the solid metal charge.
3. Vacuum casting apparatus including: walls defining an enclosure having an upper chamber and a lower chamber; evacuating means to evacuate the upper and lower chambers; isolating means to environmentally isolate the upper and lower chambers one from the other; a first chill member having a chill passage therethrough and located within the upper chamber; a second chill member within the enclosure sized to pass into the chill passage and adapted to carry a casting mold; means to move the second chill member between the lower chamber and the first chill passage; and heating means comprising a plurality of elements in substantial vertical array to heat the upper chamber; the improvement wherein: the heating means includes a vertically stacked plurality of separately controlled heat sources, each positioned substantially vertically above the first chill member, the heat sources having interior surfaces substantially aligned with each other and with the chill passage to define a hollow furnace interior adapted to receive a casting mold with a single article casting cavity enclosed by lateral walls, the interior surfaces being positioned closely adjacent and substantially enclosing the mold lateral walls during operation; the apparatus including furnace control means operatively connected with each heat source and including means for applying heat concurrently at a plurality of rates and for varying the intensity electrical power to each heat source independent of the other heat sources.
4. The apparatus of claim 3 in which the furnace control means is adapted to apply a relatively larger amount of electrical power to a first of the heat sources adjacent the first chill member concurrently with the application of a relatively smaller amount of electrical power to a heat source above the first heat source.
5. The apparatus of claim 3 which includes, in addition: process control means to coordinate the rate of heat application to the hollow furnace interior through the furnace control means with the means to move the second chill member between the lower chamber and the first chill passage.
6. The apparatus of claim 5 in which the process control means is operatively connected with the isolating means to coordinate movement of the isolating means with the furnace control means and tHe means to move the second chill member.
7. The apparatus of claim 6 in which the process control means also is operatively connected with the evacuating means to coordinate the evacuating means with the isolating means.
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