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Thermal analysis of casting process and application
Through the pouring and solidification process of casting than the internal energy distribution of thermal field analysis, the identification of a benign process conditions, thermal field, thermal field and the technology poor heat element and thermal field bad element, the degree of uniformity of thermal field, and analysis casting defects caused by the main, to take appropriate technical measures to eliminate the influence of the thermal field distribution to obtain a sound casting. Casting by three examples, illustrates the thermal field analysis of the practical application. But the casting process of the thermal field analysis depends on fluid mechanics knowledge and rich experience in casting, present only a qualitative analysis can not achieve the quantitative analysis or computer CAD.
All in the liquid metal poured into the cavity until after the solidification of liquid metal during the period, liquid metal cavity (including the casting and rigging systems) to temperature of the symptoms of Specific Energy (units of particles with energy J / kg) namely thermal field distribution.
In the traditional casting process theory, the casting material accumulation in the geometric structure, that is, the larger part of the geometric section identified as hot section, and hot section into the process control points. These are based on completion of this moment pouring molten metal, molten metal temperature Du cavity on the same basis of, and then cooling the Tiaojian Genjujunyun, unit surface area than the smallest of parts of Ji Specific Energy down the site of the most slowly, is Zui Hou solidification area, that is the general area where the hot section. But the use of castings to arrange the distribution of casting process, in the production process in practice often have defects, that is, the local casting defects caused by overheating and overheating does not appear in the hot section of office geometry. To this end introduce the concept of thermal field. After pouring through the mold, the overall temperature distribution of molten metal and as the cooling and the temperature difference between changes in distribution of the study to determine the distribution of thermal field, the concept can be used to replace than the heat inside the section, to determine the layout of casting process, in order to hot section to make up for relying solely on the lack of arrangements for casting process.
All in the liquid metal poured into the cavity until after the solidification of liquid metal during the period, liquid metal cavity (including the casting and rigging systems) to temperature of the symptoms of Specific Energy (units of particles with energy J / kg) namely thermal field distribution.
In the traditional casting process theory, the casting material accumulation in the geometric structure, that is, the larger part of the geometric section identified as hot section, and hot section into the process control points. These are based on completion of this moment pouring molten metal, molten metal temperature Du cavity on the same basis of, and then cooling the Tiaojian Genjujunyun, unit surface area than the smallest of parts of Ji Specific Energy down the site of the most slowly, is Zui Hou solidification area, that is the general area where the hot section. But the use of castings to arrange the distribution of casting process, in the production process in practice often have defects, that is, the local casting defects caused by overheating and overheating does not appear in the hot section of office geometry. To this end introduce the concept of thermal field. After pouring through the mold, the overall temperature distribution of molten metal and as the cooling and the temperature difference between changes in distribution of the study to determine the distribution of thermal field, the concept can be used to replace than the heat inside the section, to determine the layout of casting process, in order to hot section to make up for relying solely on the lack of arrangements for casting process.
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