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大型钛合金铸件的新工艺要求其铸件尺寸精度达到熔模精铸件的尺寸精度。在固定容积的夹具中进行造型材料和型芯材料的等体积碳化法可以满足此要求。 本工艺的实质是在夹具中以7.5～15.0MPa压力压制造型材料,并加热至粘接剂碳化温度。热处理参数取决于粘接剂的性能,它直接影响成品砂型的体积变化。配制碳砂型用的粘接剂为碳残余物含量的呋喃及芳族树脂,它们可以粘接焙烧砂型中的填料。粘接剂的聚合物和碳化伴有强烈的热效应、重量损失和体积变化,碳化在500～550℃结束。 最初按上述方法制出的型芯的外表面与夹具粘合而形成缺陷,改变成分和使用分离剂的效果也不理想。但在将加热温度降至130～
Large-scale titanium alloy casting new technology requires precision casting size precision castings casting precision. Equal volume carbonization of modeling materials and core materials in a fixed-volume fixture meets this requirement. The essence of this process is to press the molding material in a fixture at a pressure of 7.5-15.0 MPa and heat it to the carbonization temperature of the adhesive. The heat treatment parameters depend on the properties of the adhesive, which directly affects the volume change of the finished sand. The binder used to make the carbon sand is a furan and aromatic resin with a carbon residue content that binds to the filler in the calcined sand. Adhesive polymer and carbonization with a strong thermal effect, weight loss and volume changes, carbonization at 500 ~ 550 ℃ end. Initially, the outer surface of the core produced as described above was bonded to the jig to form defects, and the effect of changing the composition and using the separating agent was also unsatisfactory. However, the heating temperature dropped to 130 ~