L3000气缸体铁液钻芯的防止措施

Measures to Prevent Metal Leaking into Cores Joints of L3000 Cylinder Block

对L3000气缸体铸件浇注不足问题进行了分析,发现原因是:由于组合砂芯在浇注过程中受热膨胀导致砂芯之间产生间隙,引起铁液泄漏进入其内,然而全自动浇注机在铁液浇注量达到设定值时即自动停止浇注,因而导致铸件浇注不足。主要的防止措施是(1)在砂芯接合面设置凹凸槽,防止铁液进入砂芯接合间隙;(2)在铸型上增设压紧条,将砂芯压紧;(3)重新设定L3000气缸体浇注铁液量,适当补充不足的铁液量,减少铸件浇注不足废品。

The problem with the mis-run defect of L3000 cylinder block was analyzed. The reason was found as：since the cores assembly expanded during pouring process due to being heated and caused gaps formation between core and core,and further caused iron melt leakage into the gaps,however,the full-automatic pouring machine would stop pouring automatically as hmg as the pouring weight reached the pre-set value and therefore caused mis-run defect. The main prevention measures were： （1） setting concavo-eonvex strips on the joining surfaces of the cores to avoid iron melt leaking into the joining gaps; （2）setting pressing strips on the mold surface to squeeze the cores; （3）properly increasing pre-set value of the pouring weight to add the iron melt deficiency.