| 摘要 |
PURPOSE:To manufacture continuously a long-sized bent pipe whose bend processing accuracy is favorable, by a method wherein a guide device guiding a molded pipe made of thermosetting resin and a heating sphere are provided on a position below a die and simultaneously with performance of bending of the molded pipe made of the thermosetting resin while the same is being made to pass through the guide device and heating sphere the same is cured. CONSTITUTION:A molding material is extruded continuously through an outlet of a die 3 by driving extrusion molding equipment. In this instance, a setting rate of a pipe 31 made of thermosetting resin directly after extrusion is controlled so as to fall within a range of 80-90%. Then the same is sent into a heating box 51 immediately. Simultaneously with a rise of the curing rate of the pipe 31 made of the resin extruded through the die 3 in this manner to the extent of 95% while the same is passing through the heating box, bending of the pipe is advanced. The pipe 31 made of the resin which has come out of the heating box 51 and is in a hot state is sent downstream in order, to which a bending action is applied by passing through a first, second, third and fourth molding rolls 50, and is sent downstream and left out for cooling. With this construction, a product whose accuracy is high and curvature is constant can be obtained continuously and as a bent pipe is manufactured through extrusion molding, manufacturing of a long-sized thing becomes possible. |
