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铸件在凝固过程中,由于合金的液态收缩和凝固收缩常在最后凝固的部位出现分布较分散的缩孔。显微缩松,通常与合金中溶解氢气有关,在合金凝固期间,组织的晶间或树枝晶的枝晶间得不到补缩而成为缩松。在凝固期间氢气溶解度下降,被迫析出,进入缩松孔洞,阻碍了液体金属的补缩,由此造成了铸件缺陷,铸铜件更容易产生气孔、缩孔和缩松等情况。我厂生产的铸青铜件需在一定的压力状态下使用。在水压试验中,有30%的铸件渗漏报废。为了解决渗漏问题,我们首先从铸铜工艺上来控制浇注温度,并且重新选择了铸型厚度。为了除净铸
Casting in the solidification process, due to the liquid alloy liquid shrinkage and solidification shrinkage often appear in the final solidified parts of the distribution of more scattered shrinkage. Microscopic shrinkage, usually associated with hydrogen dissolved alloy, during the solidification of the alloy, the interdendritic or interdendritic dendrites are not shrinkage and shrinkage. Hydrogen solubility declines during solidification, is forced to precipitate into the shrinkage hole, hindered the liquid metal filler, resulting in casting defects, castings are more prone to porosity, shrinkage and shrinkage and so on. I plant cast bronze pieces to be used under certain pressure conditions. In the hydrostatic test, 30% of castings leak scrapped. In order to solve the leakage problem, we first control the pouring temperature from the copper casting process, and re-select the thickness of the mold. In addition to net casting