Tool head and glass or glass ceramic article producible using the tool head

Patent metadata

Field	Value
Publication number	US-10926431-B2
Application number	US-201414314428-A
Country	US
Kind code	B2
Filing date	Jun 25, 2014
Priority date	Jun 25, 2013
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A tool head capable of introducing deep recesses into hard and brittle material such as glass and glass ceramics is provided. The tool head includes a hollow cylindrical abrasive body merging into a hollow shank. The hollow cylindrical abrasive body has an end face with a central abrasive area at the location of a cylinder axis. The central abrasive area is connected with the inner wall surface of the hollow cylindrical abrasive body by at least one web. The end face of the abrasive body, the web, and at least a portion of the outer wall surface of the abrasive body are covered with abrasive. The hollow shank has at least one opening to the interior between the at least one web and the inner wall surface of the abrasive body.

First claim

What is claimed is:

1. A glass or glass ceramic element, comprising:
a block of glass or glass ceramic having a top surface and a bottom surface; and
a blind hole ground into the block of glass or glass ceramic rectilinearly from the top surface to a location near the bottom surface to define an open end at the top surface and a closed end in an interior of the block of glass or glass ceramic near the bottom surface,
wherein the blind hole has a depth that is at least five times as great as a diameter thereof, and
wherein the blind hole has a lateral wall surface with a minimum radius of at least 6 millimeters.

2. The glass or glass ceramic element as in claim 1 , wherein the block of glass or glass ceramic is configured as a mirror support for telescopes.

3. The glass or glass ceramic element as in claim 1 , wherein the block of glass or glass ceramic is configured as semiconductor manufacturing support.

4. The glass or glass ceramic element as in claim 1 , wherein the blind hole has a ratio of the depth of the blind hole to the minimum radius is greater than 10:1.

5. The glass or glass ceramic element as in claim 1 , wherein the closed end of the blind hole has a planar bottom.

6. The glass or glass ceramic element as in claim 1 , wherein the lateral wall surface has a mean roughness value of smaller than 6 μm.

7. The glass or glass ceramic element as in claim 1 , further comprising a plurality of blind holes that extend side-by-side and having a minimum distance between wall surfaces of adjacent blind holes that is not more than 15 mm.

8. The glass or glass ceramic element as in claim 7 , wherein the minimum distance is not more than 10 millimeters.

9. The glass or glass ceramic element as in claim 1 , wherein the blind hole has a cross-sectional along a longitudinal extension defined from the top surface to the bottom surface that is uniform.

10. The glass or glass ceramic element as in claim 1 , wherein the blind hole has a cross section along a longitudinal extension defined from the top surface to the bottom surface that is circular.

11. The glass or glass ceramic element as in claim 1 , wherein the blind hole has a cross section along a longitudinal extension defined from the top surface to the bottom surface that is square or rectangular with rounded corners.

12. The glass or glass ceramic element as in claim 1 , wherein the blind hole has a cross section along a longitudinal extension defined from the top surface to the bottom surface that comprises rectilinear wall sections interconnected by circularly curved wall sections.

13. The glass or glass ceramic element as in claim 1 , wherein the depth is at least ten times as great as the diameter.

14. The glass or glass ceramic element as in claim 1 , wherein the block of glass or glass ceramic has an outer surface, the lateral wall surface has a minimum distance to the outer surface that is not more than 15 mm.

15. The glass or glass ceramic element as in claim 14 , wherein the minimum distance is not more than 10 millimeters.

16. The glass or glass ceramic element as in claim 1 , wherein the lateral wall surface and the closed end of the blind hole are ground surfaces.

17. The glass or glass ceramic element as in claim 1 , further comprising:
a second blind hole ground into the block of glass or glass ceramic rectilinearly from the top surface to a second closed end in the interior of the block of glass or glass ceramic near the bottom surface; and
a lateral channel ground into the block of glass or glass ceramic from the blind hole to the second blind hole in the interior of the block of glass or glass ceramic near the bottom surface.

18. The glass or glass ceramic element as in claim 17 , wherein the second blind hole has a depth that is at least five times as great as a diameter thereof.

Assignees

• Schott Ag

Inventors

• Mischke Stefan
• Werner Thomas
• Weisenburger Marco

Classifications

• B28D1/146 Primary

  Tools therefor (drill bits for earth or rock drilling E21B10/00) · CPC title

• B28D1/186

  Tools therefor, e.g. having exchangeable cutter bits (B28D1/181 takes precedence; bits for picks or pick-holders for mining or quarrying E21C35/18) · CPC title

• B28D1/041

  with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles · CPC title

• Y10T428/24479

  including variation in thickness · CPC title

• Y10T428/24355

  Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] · CPC title