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method for praezisionsherstellung of glasartikeln, method for the production of a form and the form for the praezisionsherstellung of glasartikeln.
method for praezisionsherstellung of glasartikeln, method for the production of a form and the form for the praezisionsherstellung of glasartikeln.
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机译:的方法,用于制备青霉素的方法,一种形式的制备方法和一种形式的青霉素的方法。
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摘要
A method for the manufacture of a mould intended for the precision moulding of glass articles, notably aspherical lenses. The desired shape and dimensional accuracy are imparted to a mechanically treated preform by an accurate polishing operation. Subsequently, the polished preform is prestressed and reinforced by a chemothermal treatment. The surface of the mould thus obtained comprises an edge zone which is subject to compressive stress and which changes over, via a neutral stress-free zone, to the core which is subject to tensile stress. The mould in accordance with the invention has a longer life and produces moulded products having a quality which is higher than that of products made by means of known moulds.
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