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 Wysłany: Sob 3:01, 08 Sty 2011 Temat postu: stivali ugg Research on semi-solid forming technol |
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Research on semi-solid forming technology overview and development prospects
Forming the complex shape products. Thixotropic casting the most significant feature is the deformation before the billet was in the semi-solid die casting, injection can be generated when the shear and filling the blanks with the required good mobility, so that casting and general casting and rheological phase ratio,[link widoczny dla zalogowanych], thixotropic casting it is possible to significantly increase productivity. 7 technical and economic advantages and development direction of semi-solid forming has the following features; (1) semi-solid material in a significant reduction of deformation resistance, processing power can be larger the smaller parts, processing machinery and equipment can be miniaturized, simplified, thereby reducing investment in equipment, energy conservation} (2) materials in semi-solid flow is good, distortion is good, even very complex parts can also be forming a few working steps. This is compared and the general forging is a significant advantage. And semi-solid forming can be more easily produced close to final shape (NearNetShape) of the products,[link widoczny dla zalogowanych], shorten the processing cycle, improve material utilization, and is conducive to saving energy and materials; (3) semi-solid metal temperature lower than the liquid metal, forming die-casting mold temperature is lower than normal, and some metal has solidified, the release of latent heat of crystallization, forming metal molds and equipment for thermal shock is small, will help to improve working conditions for mold and improve their life, thus reducing production costs; (4 ) fine structure of semi-solid forming products, precipitates uniformly dispersed, there is no existing common casting coarse dendrite, can improve the mechanical properties, to prevent internal defects, improving the overall performance of products; (5) the use of semi-solid slurry of high viscosity easily mixed uniformly poor proportion of non-metallic materials and large metal and create new composite materials and metal components for the development of new materials to provide a new way. Semi-solid forming technology is an important future task is to complete the process of its industrial applications. Currently, his research focused on the following: (1) basic research. The rheological properties of semi-solid metal theory, finding the best semi-solid forming process parameters for semi-solid forming process design and optimization of the correct theoretical basis. (2) computer applications. Semi-solid forming process,[link widoczny dla zalogowanych], including computer simulation,[link widoczny dla zalogowanych], the quality of forecast products,[link widoczny dla zalogowanych], virtual forming process, mold design and manufacturing process of computer applications, the actual production process automation capabilities to ensure process reliability and product quality. (3) semi-solid forming raw materials. Is dedicated to the domestic market has not semi-solid forming of raw materials, foreign markets Taijin its semi-solid forming of aluminum raw materials supply, we must accelerate the development of other alloy series. (4) special equipment. Actively develop the characteristics of semi-solid forming for special equipment and related testing equipment to improve its processing efficiency and ensure product quality, but also conducive to the application of semi-solid forming technology promotion. (5) expanding the application of semi-solid forming technology in strengthening the research, development characteristics for semi-solid forming process the application part, the development can be used for semi-solid forming materials, such as to extend to black metal as well as areas of high temperature materials and refractory alloy of semi-solid forming. (6) composite semi-solid forming. 8 Conclusion semi-solid forming process has the old processing technology does not have various characteristics and advantages, and its saving energy, reducing waste of resources and are environmentally more special advantages of the new century, metal processing, by experts as the 21st century metal key technologies. Semi-solid forming technology is expected in the automotive, communications, computers and ancillary equipment in the field, aviation, aerospace and defense fields such as art has a broad application prospects. References 1FLemingsMC, species ai. MaterialsScienceandEngineering. 1976,25:1032 moved lI 『Masato. Hot forging speech left the ship management, 1994, ( : 88 words hit home forging weapons left Osaka Korean ship management, 1989, (5) {244 Ran ■. NEW PROCESS, 1995, (6) I25-~ 265 trees within the school. Kennedy of the processing, 1994,35 (5): 4706t Boming Yan. One is a shoe, 1995,45 (6) {3467 within the school, Sugiyama Cheng Hung, Jin well wax weak. Plastic processing, 1996,37 (¨) l2198FlemlngsMC. MetallurgicalTransactions, 1991.22A | 9579FrederickPS, etat. AdvancedMaterialsProcesses, 1988.134 (10): 5810 Cambodia Ming Fang, Su-Hua closure. China Mechanical Engineering, 1995,6 (4): 24 Received; l998 44 on August 20 for a \
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