Manufacture of Metal Castings by Photofabricated Pattern

激光束光刻技术广泛应用于试验产品。然而，由于树脂模式的耐热性和机械性能不如金属，因此可能需要树脂模式进行各种测试。因此，如果树脂图案被金属铸件快速复制，试验时间有望显著缩短。然后，将树脂模型放在石膏模具中，加热到树脂完全燃烧的温度，然后将熔融金属浇铸在模具中。结果表明，在图案较厚的情况下，石膏模会产生裂纹。然而，薄模式能够复制到金属铸件。由于热膨胀系数比石膏高，在模具内产生裂纹，燃烧使气体压力增加。然后，研究了加热速率对结晶器裂纹的影响。在模具加热速率较低的情况下，降低气体压力，防止模具开裂，并能将树脂图案复制到金属铸件上。为进一步发展该工艺，人们期待着新的用于烧模的光聚合物。

The laser beam lithography is widely applied to trial product. Resin pattern may required for various test, however, since heat resistant and mechanical properties of resin pattern was inferior to that of the metal.Therefore, if a resin pattern is quickly copied by the metal castings, time for trial is expected to be remarkably shortened.Then, the resin pattern was set in a plaster mold and heated up to the temperature the resin completely burnt out, then molten metal was cast in the mold. As the result, in case of the thick pattern, crack was generated in the plaster mold. However, thin pattern was able to be copied to the metal castings. The crack was generated in the mold, since coefficient of thermal expansion was higher than that of the plaster, and the gas pressure was increased by the burning.Then, effect of heating rate on the crack of the mold was investigated. In case of heating rate of mold was low, gas pressure was lowered, the mold was prevented from crack, and resin pattern was able to be copied to metal castings. New photopolymer for burning pattern in the mold are expected for further development of the process.