论文部分内容阅读
一、气孔的形态蒸汽机车汽缸套为我车间批量较大的产品,毛坯年产量为320吨。过去用砂型生产,77年改为离心铸造,废品率约为9％。内部气孔占整个废品的70％,这种废品要经机械加工后才能发现,造成较大经济损失。气孔的形态如图2所示,其位置多在断面中心或稍偏外圆。这种气孔呈扁平状,内表面有氧化色泽,大部都有枝晶状的凸起,形态与一般气孔不同,一般气孔呈圆形或梨形,内表面光滑。
First, the stoma shape Steam locomotive cylinder sleeve for my workshop batch larger products, rough annual output of 320 tons. In the past with sand production, 77 years instead of centrifugal casting, the rejection rate of about 9%. Internal stomata account for 70% of the entire waste product, which can only be found after machining, resulting in greater economic losses. Stomata as shown in Figure 2, its location and more in the center of the cross section or slightly outside the circle. This stomata are flat, the inner surface of the oxidation color, most have dendritic protrusions, morphology and general stomatal different, the general stomatal was round or pear-shaped, the inner surface is smooth.