designandfabricationoflowcostfilamentwindingmachine-外文文獻(xiàn)(編輯修改稿)
2025-06-26 18:57 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 rporated into machine design。 allowing for four, five and even six axes of controlled motion.advances the band delivery by one full bandwidth asshown in Fig. 2.3. Winding methodsThere are two di?erent winding methods: (I) wetwinding, in which the fibers are passed through a resinbath and wound onto a rotating mandrel (II) prepregwinding, in which the preimpregnated fiber tows areplaced on the rotating mandrel. Among these windingmethods, wet winding is more mon and widely usedfor manufacturing fiber reinforced thermosetting matrixposite cylinders. Compared with prepreg winding,wet winding has several advantages: low material cost。short winding time。 and the resin formulation whichcan be easily varied to meet specific requirements.. Winding patternsIn filament winding process, the winding tension caneasily be controlled. Winding tension, winding angleand/or resin content in each layer of reinforcement canbe varied until the desired thickness and strength ofthe posite are achieved. The properties of the finished posite can be varied by the type of windingpattern selected. In general, there are three basic filament winding patterns which are as follows.. Hoop windingIt is known as the girth or circumferential winding. Inhoop 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
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