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EQ140汽车前制动蹄轮廓尺寸为372×200×80mm,毛坯重6 kg,前制动蹄原在高压造型线(以下简称01线)上生产,每型布置4件,轴孔采用下芯方法,泥芯尺寸为φ28×100mm,用热芯盒制芯,原工艺出品率为42.84％,1984年三季度工艺员进行试验和攻关,对浇冒口进行了改进,节约了浇冒口铁水,使铸件出品率提高到61.54％,但质量很不稳定,废品率还很高,最高达18％,甚至到20％左右,废品中缩孔占的比率较大,一直未能得到很好地解决。
EQ140 front brake shoe outline size of 372 × 200 × 80mm, rough 6 kg, the former brake shoe original high-pressure molding line (hereinafter referred to as 01 line) production, each type of layout 4, shaft hole core method , Mud core size φ28 × 100mm, core box core, the original craft production rate of 42.84%, the third quarter of 1984 to test and tackle the craft, the Riser made improvements to save the pouring Riser water, So that the casting yield increased to 61.54%, but the quality is very unstable, the rejection rate is still high, up to 18%, or even 20%, shrinkage in waste accounted for a larger ratio has not been well resolved .