FIELD: physics.
SUBSTANCE: first, metal template with curved surface of revolution is made to be fitted into glass tubular blank that is sealed and heated to glass thermoplastic deformation temperature, and said template is withdrawn. After cooling template and glass tubular blank, said glass blank is vertically stretched by mechanical force applied to its bottom end. Heating is performed by moving annular heater along template working surface to its taper section.
EFFECT: preset shape with great difference in cross sections, minor roughness.
6 cl, 2 dwg
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