| 摘要 |
PURPOSE:To form easily legs to an expanded type grid body in the stage of working a belt-like sheet made of lead (alloy) by a reciprocating type expander to form network grid meshes by using small cutting blades, etc. to form the network grid meshes, etc. in the lowermost part. CONSTITUTION:The reciprocating type expander having the small cutting blades 13 necessary for forming the network grid mesh parts (a) positioned in the lowermost part is prepd. The belt-like sheet made of lead (alloy) is expanded by using said expander to form the parts (a). Lower master bone parts 17 are preliminarily formed to a large width parallel with said forming. The expanded type continuous grid body 18 formed successively with the grid meshes such as the parts (b), the parts (c) and the parts (d) is cut by a cutter 19 and the expanded type grid body having the legs 20 is completed. |
