汽缸头材料是高级铸铁,上面分布散热叶片,每片厚2公厘,高约30公厘,各片间空隙7公厘。首先考虑到怎样能很快把叶片从砂型中取出,而不把砂型拉松或拉环。曾经试用全部叶片固定在模型上及全部叶片活动,但都不够便利; Cylinder head material is a high-grade cast iron, above the distribution of heat blades, each 2 mm thick, about 30 mm high, the gap between the 7 mm. First consider how the blade can be quickly removed from the sand without pulling or pulling the sand. Have tried all the leaves fixed in the model and all leaf activity, but not enough convenience;