摘要:
This invention concerns an active reconfigurable stretch forming tool, and in another aspect the invention is a method of stretch forming. The tool comprises an array of extensible shape forming elements which are driven in extension to produce the same force per unit area across a workpiece during shape forming. An array of limit switches are located in front of the array of shape forming elements, such that each shape forming element is driven in extension towards a respective limit switch during shape forming. In use, each limit switch is activated by the workpiece as it is shaped and each switch, upon activation, prevents further extension of the respective driven element. The tool and method are useful in the forming of three dimensional shapes in solid sheet metal or mesh, to produce panels for reflector antennas.
摘要:
Bei Reflektorblechen aus Aluminium oder Aluminiumlegierungen, deren Oberflächen durch Aufrauhen, chemisches Glätten und Anodisieren behandelt sind, treten insbesondere in Verbindung mit neuartigen Leuchtstoffröhren störende Farbaufspaltungen auf. Diese können zwar durch vergleichsweise dicke Anodisierschichten vermieden werden, wodurch jedoch die Lichtausbeute eingeschränkt und eine aufwendige Herstellung erforderlich wird. Durch Erzeugung von statistisch verteilten grabenoder kraterförmigen Vertiefungen in der Reflektoroberfläche mittels Dessinierwalzen, anschließendem Überwalzen und Schaffen planparalleler Flächenbereiche mit einem Anteil bis 97 %, sowie chemischer Oberflächenglättung und Erzeugung einer Deckschicht von weniger als 5 x 10- 3 mm durch Anodisieren, können Reflektorbleche wirtschaftlich hergestellt werden, bei denen keine störende Farbaufspaltung auftritt, die eine hohe Lichtausbeute gestatten und bei denen der Anteil gerichteter Reflexion in weiten Grenzen einstellbar ist. Die erhaltene Oberflächenstrucktur kann durch rasterelektronenmikroskopische Aufnahmen sichtbar gemacht werden.
摘要:
This invention concerns an active reconfigurable stretch forming tool, and in another aspect the invention is a method of stretch forming. The tool comprises an array of extensible shape forming elements which are driven in extension to produce the same force per unit area across a workpiece during shape forming. An array of limit switches are located in front of the array of shape forming elements, such that each shape forming element is driven in extension towards a respective limit switch during shape forming. In use, each limit switch is activated by the workpiece as it is shaped and each switch, upon activation, prevents further extension of the respective driven element. The tool and method are useful in the forming of three dimensional shapes in solid sheet metal or mesh, to produce panels for reflector antennas.
摘要:
In a method of forming a rim on a lamp reflector, a forming roller is positioned on one side of the reflector rim to be formed and a support roller is positioned on the other side. The reflector is rotated about its center axis and the rollers are rotated with the same circumferential speed as the reflector rim. Then the rollers are moved such relative to each other and to the reflector that the rim is flanged between the rollers. The forming roller is moved such that the final tangent line of the circumferential face of this roller to the reflector rim is tilted about a pivot point which is positioned substantially on the bending line of the reflector rim. The invention also includes an apparatus for performing this method.