铸件上的凹槽和孔洞,一般用泥芯形成。但合箱安放泥芯时,要考虑芯子的稳固,以及浇注时芯中的气体能顺利排出型外,否则易产生尺寸不符合气孔等缺陷。当多个孔相互有联系,并且相互位置的尺寸精度要求较高时,用泥芯就不可避免地要加大加工余量。但对于高锰钢衬板上的小孔洞,因是毛坯孔,采用泥芯很难保证孔距的精度要求,同时还增加了制芯和下芯的工作量。针对上面所述,对于深度不太深的孔洞和凹槽,可采用吊砂,或叫自带 Castings on the grooves and holes, generally formed with mud core. However, when the box is placed mud core, to consider the stability of the core, as well as pouring the core of the gas can be successfully discharged type, otherwise easy to produce the size does not meet the stomata and other defects. When multiple holes are in contact with each other, and the dimensional accuracy of the mutual position is high, it is inevitable to increase the machining allowance with the clay core. However, for the high manganese steel liner hole, because it is blank hole, mud core is difficult to ensure the accuracy of pitch requirements, but also increased the core and core work load. For the above, for the depth of the holes and not too deep groove, sand can be used, or bring their own