designandfabricationoflowcostfilamentwindingmachine-外文文獻(xiàn)-全文預(yù)覽
【正文】 hoop winding, a highangle helical winding approachesan angle of 90C176. Each full rotation of the mandrelFig. 2. Circumferential or hoop winding [2].,theholderiscoupledtothemotorgearboxbyasystemof236 . Abdalla et al. / Materials and. Helical windingIn helical winding, the mandrel rotates at a constantspeed while the fiber feed carriage transverses back andFig. 4. Polar winding [2].Fig. 3. Helical winding [2].forth at a speed regulated to generate the desired helicalangles as shown in Fig. 3.. Polar windingIn polar winding, the fiber passes tangentially to thepolar opening at one end of the chamber, reverses direction, and passes tangentially to the opposite side of thepolar opening at the other end. In other words, fibersare wrapped from pole to pole, as the mandrel arm rotates about the longitudinal axis as shown in Fig. is used to wind almost axial fibers on domed end typeof pressure vessels. On vessels with parallel sides, a subsequent circumferential winding would be done.4. The proposed filament winding machineSchematic layout of the hardware configuration forproposed filamentwinding machine is shown in Fig. 5.It consists of three main units: the rotary assembly unit,the delivery unit and the control unit.. The rotary assembly unitTherotaryassemblyconsistsoftwopillarblockswhichwere held onto horizontal frame work and motor with agearboxisselectedas1:60andthereductionratiobetweenthe pulleys was taken as 1:2, so that the velocity of themandrel is fixed to rpm as shown in Fig. 6.. The delivery unitThe delivery unit consists of filament fibers holder,carriage and lead screw with a guide shaft. The leadscrew is driven by a reversible variable speed motor.The filament fiber holder is just a table with two shafts,one used for carrying one or more of the filament fiberrolls while the other one is used as a guide for the filament fiber during the fabrication process. The carriageconsists of a container and a system of polished guidepins. The container was used for carrying the resin mixture while the pins were used as a way to guide the fiberto the resin bath and to smear o? excess resin from the,thepinswereusedto generate tension in the wetted fibers before reachingthe smeared resin from the wetted fiber to the containerand reused again in order to reduce the amount of resinused for preparing the product. An optimum tension of10 N has been used through this work. This gave a fairlyconsistent volume fraction of fibers. It was found [3] thatit is important to generate tensionin the later stage of theresin path when the fibers are well wetted to avoid fiberdamage. Greater tension on wetted fiber produced excessive fiber damage and low tensions produced specimenswith unacceptably small fiber fractions.. The control unitThe control unit consists of relays, limit switches,timer and counter as shown in Fig. 7. The functionof the control unit is to control the winding processin order to get the proper winding sequence, whichis di?cult to reach manually, and to safeguard themotor during operation. The control unit als
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