去年,我厂开始生产叉车油缸,其中缸盖、缸头、导向套均为球铁件,内在质量要求高,不允许存在宏观缩松等铸造缺陷。油缸进行高压试验时不允许出现渗漏现象。通过生产实践,认为:在确保良好的铁水冶金状态下,生产健全球铁件的关键是浇注位置的确定和浇冒口系统的设计。例一:图1为原生产的缸盖工艺方案。单件毛坯 Last year, I began to produce forklift truck plant, cylinder head, cylinder head, guide sleeve are ductile iron pieces, inherent high quality requirements, does not allow the existence of macro-shrinkage casting defects. Cylinder for high pressure test is not allowed to leak phenomenon. Through the practice of production, it is considered that the key to producing a sound ductile iron piece is to determine the pouring location and the design of the sprue riser system under the condition of ensuring good hot metal metallurgy. Example 1: Figure 1 is the original production of cylinder head technology program. Single piece of rough