The relationship between the forming load and the forming process parameters greatly affects the stability of the forming process and the performance of composite stringer preforms. By applying the domestic composite material L-shaped long automatic forming machine to build a mechanical forming load test system

the variation law of forming load was tested and analyzed through the study of molding temperature

molding rate

forming pitch and layup structure

which achieved an empirical formula between process parameters and forming load. The results show that

as the molding temperature gradually increases

the molding rate gradually decreases

on the other hand

the molding pitch gradually increases

which causes the decrease of molding load. When

the lamination method is different

the molding load changes as follows: [0°/45°/90°/–45°

]

ns

[0°/90°

]

ns

[±45°

]

ns

. Finally

an empirical formula for the relationship between the forming load and the process parameters is obtained

and the molding temperature

the forming rate

and the forming pitch can be practically guided within a certain range.