真空负压法生产叉车驱动桥的工艺实践

驱动桥是叉车的重要安全零部件，材质QT450—10，对尺寸精度、表面质量、铸件的内部组织和力学性能要求很高。原工艺为普通粘土砂造型，树脂砂吊芯，每箱1件，生产率低；采用吊芯易产生偏芯造成铸件壁厚不均；普通砂造型型腔紧实度不足，易产生显微疏松，存在安全隐患，且表面质量较差。为避免这些不足，采用真空负压法试生产驱动桥获得成功。

Casting Practice of Axle Housing in Folk Lift using Vacuum Process

Axle housing is a safety critical component for folk lift truck. Its material is ductile iron QT450-10. The casting requires high standard of surface quality and imension accuracy, mechanical properties and microstructure. The original casting process was traditional sand casting, hanging risen sand core was used, one casting in each box. The productivity was very low. The hanging core was easy to deviate to its original position and cause wall section thickness not uniform. The low compatibility of sand mould was easy to cause porosity in castings; and also the surface quality is poor. In order to avoid these problems, vacuum process casting is used and quality axle housing castings have been made successfully. Using vacuum process the production of axle housing is described.