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手轮是机械行业中常见的零件,在机床行业中采用较多。我厂每年生产上万个手轮,形状和规格多种多样,材质均为HT15-33。手轮都是外露件,要求外形美观,同时要求使用时感觉舒适。为此要求外圆光洁度8并镀铬,不允许有砂眼、气孔、缩松等缺陷存在。过去我厂生产手轮采取图1的形式,铸件在粗加工中未发现缺陷,然而在精加工中发现有局部缩松,分析认为是由于暗冒口嘴部有高温铁水不断流过,温度升高,冷却慢,造成晶粒粗大的缘故。生产中由此造成的废品多达
Handwheels are common parts in the machine industry and are used more in the machine tool industry. Every year, our factory produces tens of thousands of handwheels with various shapes and specifications. The materials are all HT15-33. Handwheels are exposed parts, requiring beautiful appearance, while requiring comfort. For this purpose requires 8 and external cylindrical finish chrome, does not allow trachoma, porosity, shrinkage and other defects exist. In the past I plant the handwheel to take the form of Figure 1, the casting found no defects in roughing, however, found in the finishing of partial shrinkage, the analysis is due to stubborn mouth mouth with high temperature hot metal flow through the temperature rise High, slow cooling, resulting in coarse grain sake. As much as scrapped in production