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我厂生产的铸钢件大多用于电站设备,质量要求高,结构也较为复杂。以前,一直采用粘土干型砂工艺,铸件产生裂纹的倾向严重,尤其是热裂。以1984年上半年为例,在18种废品中,热裂便占66％。我们曾先后采用过桐油砂、木屑砂、呋喃树脂自硬砂等制芯,并反复改进铸造工艺,但热裂的问题始终未得到解决。自1985年开始,我们逐步试用加有LK系列溃散剂的水玻璃砂制芯,铸件的裂纹缺陷得到了很好的解决。以1986年上半年为例,因
Most steel castings produced by our factory are used in power station equipment, with high quality requirements and complicated structure. In the past, clay dry sand process has been used, castings have a tendency to crack, especially hot cracking. Taking the first half of 1984 as an example, of the 18 types of waste products, hot fissures account for 66%. We have used taphole sand, wood shavings, furan resin hard sand and other core system, and repeatedly improve the casting process, but the problem of thermal cracking has not been resolved. Since 1985, we have gradually tried the sodium silicate sand core with LK series of powder dispersants, and the crack defects in the castings have been solved very well. In the first half of 1986, for example