论文部分内容阅读
一般用松香加热搓成绳状埋入泥芯做通气孔道,这样每年需耗用大量的松香。现改用弹簧管状的废钢屑埋入泥芯代替松香绳做通气孔道,排气效果良好。每年可节省买松香的费用几千元。
The general use of rosin heated into a rope into the mud core vent hole, so need to consume large amounts of rosin each year. Now use the spring tubular scrap scrap embedded in the mud core instead of rosin rope ventilation channel, exhaust effect is good. Rosin can save the cost of buying a few thousand dollars a year.