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试验之初,同时采取了:增加新砂量,适当降低桩砂紧实度;控制型砂水份,减少铸型发气量;增加型砂中煤粉含量;适当增加后补铁水量,提高浇注温度等措施,但效果并不显著。继而进行用冰晶石清除皮下气孔的试验。前后试用了三种加入方法:(1)将冰晶石复盖于型砂表面;(2)混砂时加入型砂中(加入量为2％),(3)浇注时复盖在小浇包铁水液面上(复盖量约0.1～0.2％)。结果,第一种效果最
At the beginning of the experiment, the measures were taken to increase the amount of fresh sand and properly reduce the compaction of pile sand; to control the water content in the molding sand to reduce the amount of gas released from the mold; to increase the amount of pulverized coal in the molding sand; , But the effect is not significant. Subsequent experiments with cryolite to remove subcutaneous pores were performed. Before and after the trial of three ways to join: (1) the cryolite covered on the surface of sand; (2) sand was added to the sand (added in an amount of 2%), (3) Surface (coverage of about 0.1 to 0.2%). The result, the first effect is the most