Method and device for producing technical glass parts for optical applications

Patent metadata

Field	Value
Publication number	US-9290402-B2
Application number	US-201113191284-A
Country	US
Kind code	B2
Filing date	Jul 26, 2011
Priority date	Feb 23, 2006
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Mühle Peter
• Wintzer Wolfram
• Docter Optics Se

Inventors

• Mühle Peter
• Wintzer Wolfram

Classifications

• C03B2215/71

  Injecting molten glass into the mould cavity · CPC title

• C03B19/025

  by injection moulding, e.g. extrusion · CPC title

• C03B11/12

  Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; {cooling or heating of the glass in the mould}(C03B9/38 takes precedence) · CPC title

• C03B11/08 Primary

  for making solid articles, e.g. lenses · CPC title