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根据复杂薄壁铸件的熔模铸造理论,对Ti-6Al-4V合金滑轨铸件结构及难点进行了全面的研究分析,针对型壳的制造、合金的熔炼和浇注以及铸件的热等静压三个方面开展了相关工艺研究。结果表明:采用氧化钇耐火材料和三醋酸锆粘结剂进行面层造型,料浆涂挂性好,有较好的润湿性和良好的工艺性能;采用真空自耗凝壳炉熔炼合金以及离心浇注,可保证钛合金熔液的质量和充填性能;采用热等静压工艺处理铸件,可提高铸件的质量和性能。最终确定熔模精密铸造最佳工艺参数,并据此生产出了合格的铸件。
According to the theory of investment casting of thin-walled castings, the structure and the difficulties of Ti-6Al-4V alloy sliding rail casting are comprehensively studied and analyzed. For the manufacture of the shell, the melting and pouring of the alloy and the hot isostatic pressing of the casting The relevant aspects of the process of research. The results show that: the yttrium oxide refractories and zirconium triacetate binder surface modeling, good slurry coating, good wettability and good process performance; the use of vacuum self-condensing shell furnace melting alloy and Centrifugal casting, to ensure the quality of titanium alloy melt and filling performance; using hot isostatic pressing process castings can improve the quality and performance of castings. Finally determine the best investment casting precision process parameters, and accordingly produced a qualified castings.