FORFARANDE FOR FRAMSTELLNING AV EN RORKROK AV TERMOPLAST OCH ANORDNING FOR DETTA FORFARANDE

摘要

In the process a straight pipe piece is heated to thermoforming temperature. A core built up from thin steel lamina (1) is pushed into the heated pipe piece (7). The lamina can be held together at one end by a bush (2) provided with a cover (3) and a lug (4). The pipe piece is placed in the holding device (8) and bent about a bending piece (9) whose radius corresponds to the radius of curvature of the pipe bend. Then the core is pulled out of the pipe bend by means of the lug (4). The disadvantages of known processes are avoided in a cost-saving manner.