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1. In this paper the deforming features of drawing circular cup from square blank are analyzed and the comparative experiment is carried out between square blank and circular blank.
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2. The drawing die structure of shirt oil bottom shell is introduced, the surrounding border of shirt oil bottom shell needs to be drawn at concave die and blank holder.
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3. The development and improvement of terminal guided projectile are introduced, which includes terminal guided howitzer shell, terminal guided mortar shell and extended-range shell of naval gun.
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4. Both equal to the size of the shell, Chien-Hou was oval, shell-shaped face has Walloon radiation rib, thin skin was brown, white shell surface.
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5. Bivalve and gastropoda are the main species building up the shell ridge, of which the content of shell is more than 95%. This is rarely compared with other shell rigs in the world.
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picture in carved shell sea-shell carving shell picture
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picture in carved shell sea-shell carving shell picture
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picture in carved shell sea-shell carving shell picture
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