Because the sand cast turbine blade has the characteristics of extremely complex spatial surface, the three-dimensional spatial coordinate system is established on the graphical interface of the software by using UG software. With the help of the two-dimensional wood mold graphics of sand cast turbine blade under CAD, the spatial coordinates of some points on the curved section of sand cast turbine blade are determined in the coordinate system, and then the coordinates of these points are connected to generate spatial surface, Connect the generated front and rear space surfaces and sew them into a solid, so as to complete the three-dimensional solid modeling of sand casting turbine blade.
As shown in the figure, the three-dimensional solid diagram of sand cast water turbine blade includes all machining allowance of the blade. The size of sand cast water turbine blade is 4400mmx400mm, and the gross weight of sand cast water turbine blade is 13700kg.