Method and device for producing technical glass parts for optical applications
Disclosed is a method for producing a technical glass part, particularly meeting high requirements with respect to contour accuracy and surface quality, particularly a precision lens, wherein a blank including a cast-on section is produced using an injection molding process, wherein the blank is cooled down and subsequently heated, and wherein the blank subsequently is blank molded, particularly on both sides, into a technical glass part meeting high requirements with respect to contour accuracy and surface quality, particularly a precision lens.
1. A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
producing a blank from glass;
inverting a temperature gradient of the blank by cooling at a temperature between 20K and 200K beneath the transformation temperature TG of the glass of the blank and subsequently heating the blank at a temperature between 1000° C. and 1250° C.; and
subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
2. The method of claim 1 , wherein the temperature of the blank before the heating is in the range of TG−80K to TG+30K.
3. The method of claim 2 , wherein the blank is heated such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5.5 Pas and 10 7 Pas.
4. The method of claim 3 , wherein the mass of the blank is in the range of 50 g to 250 g.
5. The method of claim 1 , wherein the blank is heated such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5.5 Pas and 10 7 Pas.
6. The method of claim 5 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is always at least 100° C. above room temperature.
7. The method of claim 1 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is always at least 100° C. above room temperature.
8. The method of claim 1 , wherein the blank is cooled at a temperature between 300° C. and 500° C.
9. A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
producing a blank from glass;
inverting a temperature gradient of the blank by cooling and subsequently heating the blank at a temperature between 1000° C. and 1250° C., wherein the blank is cooled such that the temperature of the blank before the heating is in the range of TG−80K to TG+30K; and
subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
10. The method of claim 9 , wherein the blank is heated such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5.5 Pas and 10 7 Pas.
11. The method of claim 10 , wherein the mass of the blank is in the range of 50 g to 250 g.
12. The method of claim 11 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is always at least 100° C. above room temperature.
13. The method of claim 10 , wherein the blank is cooled at a temperature between 300° C. and 500° C.
14. The method of claim 9 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is at least 100° C. above room temperature.
15. The method of claim 9 , wherein the blank is cooled at a temperature between 300° C. and 500° C.
16. A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
producing a blank from glass;
inverting a temperature gradient of the blank by cooling and subsequently heating the blank such that the viscosity at the surface of the blank is at least 10 5 Pas lower than the viscosity of the core of the blank; and
subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
17. The method of claim 16 , wherein the mass of the blank is in the range of 50 g to 250 g.
18. The method of claim 16 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is always at least 100° C. above room temperature.
19. The method of claim 16 , wherein the blank is cooled at a temperature between 300° C. and 500° C.
20. The method of claim 16 , wherein heating of the blank is performed at a temperature between 1000° C. and 1250° C.
21. The method of claim 16 , wherein the blank is heated such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5.5 Pas and 10 7 Pas.
22. A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
producing a blank from glass;
inverting a temperature gradient of the blank by cooling and subsequently heating the blank at a temperature between 1000° C. and 1250° C. such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5.5 Pas and 10 7 Pas; and
subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
23. The method of claim 22 , wherein the mass of the blank is in the range of 50 g to 250 g.
24. The method of claim 22 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is always at least 100° C. above room temperature.
25. The method of claim 22 , wherein the blank is cooled at a temperature between 300° C. and 500° C.
26. A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
producing a blank from glass;
inverting a temperature gradient of the blank by cooling at a temperature between 70K and 150K beneath the transformation temperature TG of the glass of the blank and subsequently heating the blank such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5 Pas and 10 8 Pas; and
subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
27. The method of claim 26 , wherein the temperature of the blank before the heating is in the range of TG−80K to TG+30K.
28. The method of claim 26 , wherein the mass of the blank is in the range of 50 g to 250 g.
29. The method of claim 26 , wherein the temperature gradient of the blank is adjusted such that the temperature in the core of the blank is always at least 100° C. above room temperature.
30. The method of claim 26 , wherein heating of the blank is performed at a temperature between 1000° C. and 1250° C.
31. The method of claim 26 , wherein the blank is cooled at a temperature between 300° C. and 500° C.
32. The method of claim 26 , wherein the blank is heated such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 10 5.5 Pas and 10 7 Pas.