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本文研究用橄榄石砂进行负压薄膜造型时,各种不同工艺因素对铸铁件表面光洁度的影响,试验结果:不同壁厚(5～35mm)的试样,经用光切法显微镜测定,表面不平度为14.0～73.3μm,即国家标准表面光洁度▽5～▽3级;通过计算机计算各影响因素的显著性说明,橄榄石砂粒度分布和涂料的作用最为显著,真空度和浇注温度次之.研究表明,橄榄石砂的化学成分和矿物性能较硅砂优越,用之于铸铁件生产,能提高铸件质量;又由于它不含游离的二氧化硅,兼有减少硅肺公害的特点,所以颇适用于负压薄膜造型.
In this paper, the effect of various process factors on the surface finish of cast iron during the negative pressure film molding with olivine sand was studied. The test results showed that the samples with different wall thickness (5 ~ 35mm) Unevenness of 14.0 ~ 73.3μm, that is, the national standard surface finish ▽ 5 ~ ▽ 3; by computer calculation of the significant factors that affect the distribution of olivine sand and paint the role of the most significant, followed by vacuum and pouring temperature The study shows that the chemical composition and mineral properties of olivine sand superior silica sand, used in the production of cast iron, can improve the quality of castings; but also because it does not contain free silica, both to reduce the characteristics of silicosis, so Very suitable for negative pressure film modeling.