US 12,220,880 B2
Method for producing tube body
Takahiro Nakayama, Ibaraki (JP); Kenichi Mori, Ibaraki (JP); and Kazuki Ohta, Ibaraki (JP)
Assigned to HITACHI ASTEMO, LTD., Ibaraki (JP)
Filed by Hitachi Astemo, Ltd., Ibaraki (JP)
Filed on Aug. 9, 2022, as Appl. No. 17/884,343.
Application 17/884,343 is a continuation of application No. PCT/JP2020/012538, filed on Mar. 19, 2020.
Prior Publication US 2022/0379570 A1, Dec. 1, 2022
Int. Cl. B29C 70/30 (2006.01); B29K 307/04 (2006.01); B29L 23/00 (2006.01)
CPC B29C 70/30 (2013.01) [B29K 2307/04 (2013.01); B29L 2023/22 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A tube body production method comprising:
a disposing step of disposing fibers with respect to an outer circumferential surface of a circular cylindrical tube so that an orientation angle of the fibers with respect to an axis of the circular cylindrical tube is such that the fibers are wound by less than one turn with respect to the circular cylindrical tube, the outer circumferential surface having a circular cylindrical tube shape with a consistent diameter;
a molding step of impregnating the fibers with a resin on the outer circumferential surface of the circular cylindrical tube and then heating the resin to mold the resin; and
between the disposing step and the molding step, an upper end portion fixing step of fixing an upper end portion of the fibers with respect to the outer circumferential surface of the circular cylindrical tube by an upper end portion fixing member,
wherein the disposing step and the molding step are performed in a state where the axial direction of the circular cylindrical tube coincides with an up-down direction, and
wherein in the molding step, the circular cylindrical tube on which the upper end portion of the fibers have been fixed by the upper end portion fixing member is disposed in a space of a molding device and the resin in a molten state is injected to the space from above the upper end portion to impregnate the fibers with the resin.