迄今为止，对新型铸型和型芯涂料的研究是以流变学理论为基础的。
The research on new mould and core coatings has been based on the theory of rheology so far.
涂料隔热性能的优劣不仅影响金属型芯的使用寿命及范围，而且对铸件质量有着重要的影响。
The insulating property of coating influences the scopes and lives of metal cores, and has an important effect on the quality of casting.
通过改进浇注系统，特别是采取在进、排气道芯砂中添加特殊抗脉纹添加剂及在砂芯表面涂刷烧结型涂料等工艺，有效地预防和消除了脉纹缺陷。
Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
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