Methods and apparatus for making ring-shaped parts out of a composite material, as well as preforms therefor
US5991987A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Dec 17, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2069/008
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Preforms for producing annular parts of composite material are produced by inding a strip (1) of fibrous material around an elliptical mandrel (10) to produce an elliptical sleeve which can be cut obliquely, cutting taking place either before or after one or more densification steps. The cutting plane is inclined relative to the right cross section of the elliptical sleeve, and the inner and outer portions of the cut rings are machined to obtain circular elements. Such elements can produce annular parts of composite material having a reduced tendency to delanination under circumferential stress. The superposed layers are needling together during winding. A uniform needling density per unit area can be obtained by controlled displacement of the needle board (5) and of the elliptical mandrel (10) relative to each other as the mandrel turns, to compensate for the eccentricity of the cross section of the mandrel. These methods are particularly suitable for producing brake disk preforms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.