Removal of enclosed glass parts after cutting using heating and cooling techniques
US6829910B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2000 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Apr 25, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/0414
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for forming a magnetic disk comprises the following steps. First, an inner and outer cut is provided in a work piece. The waste piece thus comprises an outer waste piece, an inner waste piece, and a region between the inner and outer waste pieces that is to be used as a substrate for manufacturing a magnetic disk. The outer waste piece is separated from the substrate by applying a hot plate against the outer waste piece, thereby causing it to thermally expand and separate from the substrate. The substrate is then placed over (but not in contact with) a hot plate, while a cooling element is placed on the inner waste piece. This causes the substrate to thermally expand while the inner waste piece thermally contracts. Thus, a gap forms between the substrate and inner waste piece, thereby permitting the separation of the inner waste piece from the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.