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1,绪言近几年来,有机自硬性砂由于造型容易,强度高.旧砂能反复回收、再生,所以从大铸件到中、小铸件上都得到了广泛的应用.不过,为了充分发挥这些有机自硬性砂的特征,有必要对石英砂、树脂、造型方法、铸造方案、再生方法等进行研究.其中,石英砂对有机自硬性砂型特性的影响因素是粒度、砂粒形状、pH值、酸耗值等.进而考虑到再生砂中树脂残量引起气孔等缺陷,则旧砂的灼减量、发气量等也成为要讨论的问题.
1, Introduction In recent years, the organic self-hardening sand is easy to use and has high strength because it can be recycled and regenerated repeatedly, so it has been widely applied from large castings to medium and small castings. However, in order to give full play to these organic It is necessary to study the properties of self-hardening sand, such as quartz sand, resin, modeling method, casting scheme, regeneration method, etc. Among them, the influencing factors of the characteristics of self-hardening sand are quartz grain, sand shape, pH value, acid consumption Value, etc. Furthermore, taking into account the residual resin in the recycled sand causes defects such as porosity, the burned amount of old sand, the amount of gas evolution has also become a problem to be discussed.