我厂阀体原来由13个下料机加件焊接组合而成,后来改为Z G35精铸件,从它的结构来看为箱体式,壁厚不均匀,热节部位多,壁薄处为4毫米,最厚处为20毫米,并有较大的平面和较多的转角(图1)。该件号自改为精铸件以来,热裂和缩陷、缩孔等疵病严重、良品率一直较低,经改进后良品率由原来的68%提高到85%以上,铸件焊补率由原来的80%降到9%。 I plant the original valve from the cutting machine plus a combination of pieces of welding, and later changed to Z G35 casting, from its structure point of view for the box-type, uneven wall thickness, hot section of the site more thin wall 4 mm, the thickest at 20 mm, and a larger plane and more corners (Figure 1). The part number since the casting changed since the hot cracking and shrinkage, shrinkage and other defects seriously, the yield has been low, the improved yield increased from 68% to 85%, the casting weld-up rate from The original 80% down to 9%.