Method for manufacturing fiber bundle-containing product, and filament winding apparatus

6:

• A manufacturing method of manufacturing fiber bundle-containing products including fiber bundles in a filament winding apparatus configured to wind the fiber bundles onto each of mandrels, the filament winding apparatus including a jig mandrel that is shorter than each of product mandrels in a mandrel axial direction, a feeder capable of serially feeding the jig mandrel and the product mandrels aligned in the mandrel axial direction and connected, from an upstream side to a downstream side in a feeding direction that is along the mandrel axial direction, and helical winders aligned in the mandrel axial direction and each of which is capable of helical-winding the fiber bundles onto the jig mandrel and the product mandrels, the manufacturing method comprising:
• a jig feeding step of attaching the jig mandrel to the feeder and feeding the jig mandrel to a predetermined helical winder among the helical winders;
• a yarn placement step of fixing a leading end portion of each of the fiber bundles fed from the predetermined helical winder to the jig mandrel, after the jig feeding step;
• a connecting step of serially aligning the product mandrels in the mandrel axial direction and connecting the product mandrels so as not to be relatively rotatable on the upstream side in the feeding direction of the jig mandrel, after the jig feeding step;
• and
• a helical-winding step of serially performing helical winding for the product mandrels by the helical winders, while serially feeding the product mandrels connected in the connecting step to the downstream side in the feeding direction, after the yarn placement step.

7:

• The manufacturing method of manufacturing fiber bundle-containing products according to claim 6, wherein the helical-winding step includes:
• a first helical-winding step of winding the fiber bundles onto the product mandrels at a first winding angle;
• and
• a second helical-winding step of winding the fiber bundles onto the product mandrels at a second winding angle that is different from the first winding angle;
• the manufacturing method further comprising:
• a winding angle change jig feeding step of connecting the jig mandrel to an upstream end in the feeding direction of a first mandrel onto which the fiber bundles are wound last in the first helical-winding step among the product mandrels so that the jig mandrel and the first mandrel are non-rotatable relative to each other, and feeding the jig mandrel to the downstream side in the feeding direction;
• a winding angle change fixing step of fixing an intermediate portion of each of the fiber bundles to the jig mandrel, after the winding angle change jig feeding step;
• and
• a winding angle change connecting step of connecting the jig mandrel with a second mandrel onto which the fiber bundles are wound first in the second helical-winding step among the product mandrels so that the jig mandrel and the second mandrel are non-rotatable relative to each other.

8:

• The manufacturing method of manufacturing fiber bundle-containing products according to claim 6, wherein
• the feeding direction includes a horizontal component;
• the filament winding apparatus includes a mandrel support which supports the intermediate portion in the mandrel axial direction of each of the product mandrels that are connected in the mandrel axial direction;
• and
• each time a unit feeding step of feeding a mandrel group including the product mandrels once from an upstream end to a downstream end in the feeding direction is performed for a first number of times which is at least once, angles of the product mandrels about the axes are changed for an angle that is different from a multiple of 360 degrees, in a next unit feeding step.

9:

• The manufacturing method of manufacturing fiber bundle-containing products according to claim 6, wherein
• in the jig feeding step, a first jig mandrel is used as the jig mandrel;
• and
• after the jig feeding step, the unit feeding step of feeding the mandrel group including the product mandrels once from the upstream end to the downstream end in the feeding direction is performed at least for a second number of times, and then a second jig mandrel that is thicker than the first jig mandrel is attached to the feeder.

10:

• A filament winding apparatus which is configured to wind fiber bundles onto each of mandrels, the filament winding apparatus comprising:
• a jig mandrel which is shorter than each of product mandrels in a mandrel axial direction;
• a feeder which is capable of serially feeding the jig mandrel and the product mandrels aligned in the mandrel axial direction and connected, from an upstream side to a downstream side in a feeding direction that is along the mandrel axial direction;
• and
• helical winders aligned in the mandrel axial direction and each being capable of helical-winding the fiber bundles onto the jig mandrel and the product mandrels.