摘要
我厂生产的AH-12型小四轮拖拉机变速箱体,材质为HT200,毛坯重66kg,铸件主要壁厚为8mm,是典型的薄壁箱型结构。毛坯简图如图1。一、变速箱体铸造工艺概况变速箱体铸造工艺如图2。中心对称分型;每型一件,机器造型,手工制芯;铸件的主体坭芯采用粘土砂芯;浇注系统采用扁梯型内浇口,于铸件分型面薄壁区进铁水。上型腔放φ16出气冒口一个。浇注系统的比例为: ∑F_内:∑F_横:F_直=1:1.6:1.
The features and mechanism of generating casting crack in the gearbox-body of small four- wheel tractors have been described in the paper. By improving the heat distribution of the whole casting in the pouring process, and therefore reducing the thermal stress of the casting, this technological method have been proved to be effective.
出处
《铸造技术》
CAS
北大核心
1990年第1期26-27,共2页
Foundry Technology
