一、概述铸造上长期采用植物油、合脂作芯砂粘结剂。主要缺点:1、需要烘炉烘干,硬化速度慢、生产周期长,占地面积大、效率低。2、在湿态下从芯盒中起芯和烘干时易变形。尺寸精度低、废品率高。 First, an overview Casting long-term use of vegetable oil, grease for sand core binder. The main disadvantages: 1, need to oven drying, hardening slow, long production cycle, covers an area of ​​?? large, low efficiency. 2, in the wet state from the core box core and drying easily deformed. Low dimensional accuracy, high rejection rate.