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最近我厂铸造一批重1.2~3.8吨、平均壁厚50~65毫米、最大壁厚100~120毫米、外形尺寸(长×宽×高)为1.2~2.5×1~1.8×0.4~O.65米的大型零件,原有的烘房及砂箱工具都不能满足生产的需要.我们便大胆试用地坑造型,刷上水玻璃快干涂料然后进行表面烘干.到目前为止,已生产了四十多件厚大零件,检查桔果铸件全部达到要求,除个别零件在浇口附近稍有粘砂外,其余表面光洁,没有一件因产生气孔、夹砂、掉砂等缺陷而报废.现将情况述简于下:
Recently, I plant a number of heavy castings 1.2 ~ 3.8 tons, the average wall thickness of 50 to 65 mm, the maximum wall thickness of 100 to 120 mm, dimensions (length × width × height) of 1.2 ~ 2.5 × 1 ~ 1.8 × 0.4 ~ 65 meters of large parts, the original drying room and sand box tools can not meet the production needs, we will boldly try the pit shape, brush the water glass quick-drying paint and then dried. So far, has been produced More than 40 pieces of large parts, check the orange fruit castings all meet the requirements, in addition to individual parts slightly sticky sand near the gate, the rest of the surface smooth, no one due to porosity, sand, sand and other defects scrapped. Now the situation is briefed on the following: