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在熔模铸造中,影响铸件精度的因素很多,其中的一个重要因素是由于低温模料(石蜡和硬脂酸各50%)的膨胀收缩率大,软化点低,强度不够等原因造成的蜡模变形,影响精度。低温模料具有成本低、使用方便、又可连续回用等优点,为高、中温模料所不及。能否扬长避短,在叶片、叶轮等高精度铸件上,使用低温模料做出高精度的铸件呢?我们做了一系列的探讨工作:如控制模具温度、模料温度;增长保压时间;提高压射压力等,但效果都不明显。后来,我们根据低
In investment casting, castings affect the accuracy of casting many factors, one of the important factors is due to the low temperature mold (paraffin and stearic 50%) of the expansion and contraction rate, low softening point, the strength of the wax is not enough and other reasons Die deformation, affecting accuracy. Low-temperature mold with low cost, easy to use, but also the advantages of continuous use, as high, medium temperature mold less than. Can we avoid weaknesses, high-precision casting such as blades, impellers, the use of low-temperature mold to make high-precision castings? We have done a series of discussions: such as control of mold temperature, mold temperature, increased dwell time; increase Injection pressure, but the effect is not obvious. Later, we are based on low