A glass sheet bending mold for bending a heated glass sheet into a predetermined shape is formed by casting a steel material having a heat resistance properties so as to be stable at a temperature suitable for bending a glass sheet. The glass sheet contacting surfaces of the mold is a precisely curved surface finely finished by shaving or grinding.

Glass sheet bending mold

A glass forming mold which comprises a substrate made of stainless steel and a coating comprising the following components formed as the outermost surface coating on the substrate: (1) from 40 to 94 wt % of nickel and/or cobalt as component A; (2) from 5 to 59 wt % of tungsten as component B; and (3) from 0.5 to 40 wt % of at least one transition element having a melting point of at least 2,200° C. as component C.

Method for forming a glass product for a cathode ray tube

Tools for the handling and shaping of glass, such as dies, moulds, shears. Sticking of the glass to the tool is prevented by the presence, at the tool surface, of a layer which has a low intrinsic strength with respect to the glass. This layer may be present as such or may be produced after oxidation. A number of possible materials are: boron carbide, Ni-Cr-B-alloys, tantalum boride.

Tools for the handling and shaping of glass

A tool for making bases for three-way lamps in which it is easier to feed lead wires through because the tool has a first projection in the middle of its base which projection has a round cross-section of a given diameter in the plane perpendicular to the tool's longitudinal axis and a second projection having a cross-section in the forementioned plane having a longer circumferential dimension than a radial one and in which the circumferential dimension is at least as large as the diameter of the first projection in the forementioned plane.

Tool for making three-way lamp bases

Werkzeug zur handhabung und formgebung von glas

1,164,988. Making moulds. TOKY SHIBAURA ELECTRIC CO. Ltd. 20 Feb., 1968, No. 8282/68. Heading B3A. [Also in Division C1] A compression mould assembly for producing a glass article having a zone of reduced thickness as compared with the rest of the article comprises a plunger 1 and complementary mould 2 having opposed moulding surfaces adapted to compress therebetween a glass mass to the desired form, the moulding surfaces of each mould being formed of (i) carbon steel containing less than 0A3% by wt. carbon, (ii) ferritic stainless steel or ferritic heat-resistant steel containing less than 0A4% by wt. carbon, or (iii) austenitic stainless steel or austenitic heatresistant steel, except for the portion of the moulding surface of at least one of the moulds, which provides the zone of reduced thickness in the article, said portion being formed of a selffluxing nickel-chromium-boron base alloy having a Rockwell hardness of less than 45. The surface of the plunger 1 is formed by fusing the Ni-Cr-B alloy to the body of the plunger, which is of heat resisting steel, and parts are removed by cutting to form the bottom portion of the mould surface 16. A ring 10 is slidably mounted around the upper part of plunger 1 and has a boss-like portion 12 which seats on a recessed ledge 12 in the upper edge of mould 2. The moulds are preferably made of heat resisting steel containing 13% by wt. of chromium. That area of the plunger designed to form the area of reduced thickness may have a composition in per cent by wt., of Ni 90, Cr 5, B 1, Fe+Si+ C 4 and a Rockwell hardness of 20, or Ni 80, Cr 11, B 3, Fe + Si + C 6 and a Rockwell hardness of 40. The preferred range is Ni 75-90, Cr 4-18, B 0A75-4A5 and Fe+Si+C less than 10. The mould assembly is preferably used for cathode-ray tube cone portions.

Fukuda Mitsugu

Papers

Compression mould assembly for producing glass articles of uneven thickness