FIELD: process engineering.
SUBSTANCE: invention relates to glass sheet forming. Preheated glass sheet is formed to concave curved shape with top end parts and mid part having rectilinear elements. Note here that glass sheet is curved across rectilinear elements. Formed glass sheet is arranged above top mould with convexity directed downward in crosswise directions. Glass sheet end parts are displaced upward relative to mid part to their contact with top mould surface directed downward to form rectilinear elements of end parts. Then, glass sheet mid part is displaced upward relative to its ends to place said mid part in contact with top mould bottom surface to form mid part rectilinear elements.
EFFECT: ruled out optical defects in forming process.
14 cl, 14 dwg
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