Mechanism and optimum shape of knife edge for metal sealing
| Autor: | K. Hosokawa, Koichi Funabashi, Y. Matsuzaki |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Materials science
Carbon steel Mechanical Engineering Mineralogy Surfaces and Interfaces Surface finish Edge (geometry) engineering.material Compression (physics) Ridge (differential geometry) Surfaces Coatings and Films Lapping Mechanics of Materials Indentation Surface roughness engineering Composite material |
| Zdroj: | Tribology International. 25:397-403 |
| ISSN: | 0301-679X |
| DOI: | 10.1016/0301-679x(92)90077-z |
| Popis: | The contacting state of knife-edge seals was investigated and a new type of knife edge was developed. The contacting state of knife-edge seals was divided into three types according to the apex width of the knife edge: (a) penetration type, (b) indentation type, and (c) intermediate type. The developed knife edge had a contacting state of penetration type (a). Because of the narrow apex width of the knife edge, the values of Pc/l for the compressive forces per unit length required for sealing were lower than those of other types of knife-edge seals. The contact pressure required for sealing was nearly equal to the Meyer's hardness in the sealing surface layer, regardless of the surface roughness in turning. The optimum shape of the knife edge was of type (a) and had a ridge in a V-shaped cross-section with a plane inclined 30° off normal and the flat area of its apex finished by lapping was about 35 μm wide. The knife edge made of hard material with optimum shape could be utilized in the cases where the sealing materials were copper, carbon steel and stainless steel, and the values of Pc/l were approximately 15–40, 45–110 and 80–190 kN m−1, respectively. |
| Databáze: | OpenAIRE |
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