Design And Research Of The Control System Of Fiber Placement Foot

With constantly expanded applications of composite material, they propose a higher demand for molding technology of composite material. Carbon fiber, a kind of composite material, has been widely used in aerospace field with its advantages, such as light weight, strong strength and anticorrosion etc.This paper mainly studies technology of filament placement molding,which is a kind of fully automatic manufacturing technique developed on the basis of fiber winding and automatic band placement, so it has a strong adaptability of products, and can be used for fiber reinforced products with concavo-convex curved surfaces and relatively complex from such as grooves. Fiber placement equipments, controlled by computer, can complete the assignment of fiber placement according to scheduled track set by computer. In the placement process, placement equipment can realize variable-angle placement, and also adaptively increase or decrease fiber tow points according to the shape of components. At present, as the research of filament placement device is still at a preliminary stage in the domestic, we must commit to the research of this advanced technology, making a wide use in defense filed..The control system of six -fiber tows placement boots, proposed in this project, adopts the mainstream open control mode of IPC+PMAC. IPC, as host computer, completes system-level control tasks such as communications between upper and lower computers, condition monitoring, human interface management etc; PMAC takes charge of logical control and real-time motion track control of placement boots. In the process of fiber placement, fibers sent from the yarn group, will go into the surface of the component, after guide, clamping, re-send and cut devices, then in the lead of constant pressure of placement boots, fibers will compress to the component according to the given path set by programs and through heating unit, so placement task can be completed successfully. In this paper, the pressure of the six placement boots needs to be controlled separately, the pressure for filament, tested by pressure testing devices, will feedback to PMAC card; then, compensating signal can be obtained after calculation by PMAC; eventually, errors can reduced by signal driving the servo motor to promote placement boots to take corresponding motion. Moreover, overall control of rotate motion of six placement boots is in need, to fulfill placement task for complex-shaped surface components.According to the hardware platform of the six fiber placement control system, application software is developed. Software of this system is divided into two parts: human-machine interface and PMAC motion control program. The human-machine interface, based on Windows system, is developed by using Visual C++6.0 as program development tool, and employing PCOMM32 dynamic link library provided by PMAC and Windows API functions; the motion control programs are written and executed by PEWIN32 executive software of PMAC of its own.