Manufacture of Metal Castings by Photofabricated Pattern

激光光刻广泛应用于试制。然而，树脂模型的耐热性和机械性能比金属差，因此在各种试验中需要树脂模型。因此，如果用金属铸件快速复制树脂模型，试验时间有望大大缩短。然后，将树脂模型放入石膏模具中，加热到树脂完全燃烧的温度，然后将熔融金属浇铸到模具中。结果，在厚图案的情况下，在石膏模具中产生裂纹。然而，薄模式能够复制到金属铸件。由于石膏的热膨胀系数大于石膏的热膨胀系数，在燃烧过程中气体压力增加，导致模具产生裂纹，研究了升温速率对模具裂纹的影响。在模具加热速率低的情况下，降低气体压力，防止模具破裂，并且树脂模型能够复制到金属铸件上。新的光敏聚合物在模具中燃烧图案的过程中，预计进一步发展。

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.