一、铸件截面厚度的增加将导致材料性能的降低铸态材科仍是当今机械制造工业和造船工业广泛使用的材料之一,在腐蚀介质里,用铜合金铸造的各类零件更显示出其优越性。随着工业的发展,有些机械装置或单一的机械零件其结构尺寸要求设计甚大,从而使某些零件具有很大的截面厚度(如大型螺旋桨、大型减速箱箱体、蜗轮、大功率发动机机身 First, the increase in the thickness of the casting cross-section will result in the reduction of material properties Astronomical Materials is still today’s machinery manufacturing industry and shipbuilding industry, one of the widely used materials in the corrosive medium, with copper alloy casting all kinds of parts even more shows its Superiority. With the development of industry, some mechanical devices or single mechanical parts have great structural dimension requirements, so that certain parts have very large cross-sectional thicknesses (such as large propellers, large reduction gear boxes, worm gears, high-power engine bodies