显微组织分析表明，呋喃树脂砂生产摇枕、侧架所出现的裂纹按照产生原因分为缩裂纹和拉裂纹。
According to microstructure analysis, cracks in bolster and side frame produced by Furan self-cured sand can be classified into shrinkage hot cracks and stress hot cracks.
在热裂试验的基础上，得到了铸件热裂纹倾向的临界值，进而实现了摇枕、侧架的热裂纹预测。
The critical value of hot crack has been obtained according to the experiments on test casting, and it had been used on predicting the hot crack of bolster and side bearer.
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