The similar problem on computing blank size also exists in sheet forming, such as spreading size of bending piece, blank size of axial symmetry parts by deep drawing.
板材成形中同样存在着计算坯料尺寸的问题，如弯曲件展开尺寸的计算，轴对称拉深件坯料尺寸的确定等。
2
The downward drawing formation device and method for producing sheet material is applied in producing great size glass plate in low cost, high efficiency and high quality.