designandfabricationoflowcostfilamentwindingmachine-外文文獻(xiàn)-閱讀頁(yè)
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【正文】 eroneismovableandcanbeadjustedisseatedproperlyintotwofreelyrotatingcupholders,theDesign 28 (2020) 234–239shown in Fig. 6. The fabrication process consists of five. Abdalla et al. / Materials and Design 28 (2020) 234–239 237steps as follows: the first step is to fix the mandrel whichmay be as aluminum or plastic PVC tubes or any di?erent cylindrical mandrel shape on the machine blocksusing end fixtures. The second step is to prepare the reFig. 5. Schematic diagram for proposedFig. 6. Setup of the specimensin bath, which is a mixture of epoxy resin and hardener,using a specific ratio and putting it in the container. Thetype of epoxy resin and hardeners used in this investigation were MW 215 TA and MW 215 TB, respectively.winding machine.on the winding machine.714 1389125111 111411279813562882776Timer_1 Timer_2CounterRelay_2 Relay_3238 . Abdalla et al. / Materials and98 410 11 123217651413CWOFFCCWONOFF6781SW2NAutoManualONOFFSW3SpeedRelay_1They were mixed in a ratio of 4:1, respectively. Thethird step is to pass the fiber tow through the resinbath and then on the mandrel through a series ofpins. These pins make the fiber straight and reducethe amount of resin in the fibers. The fourth step isto control the speed of screw to give the proposedwinding angle. The fifth step es after the layersof fibers were wound onto the mandrel, the specimenleft to rotate on the mandrel for 3 h at room temperature to prevent resin dropping, then after solidification the specimen pulled o? the mandrel and thencut to the required lengths.The relation between winding angle and the speed ofthe screw for mandrel of diameter mm is shown inFig. 8. This has been calculated using the relationsbelowh 188。 240。where h is the winding angle, r is the Mandrel radius, Nmis the Mandrel speed, VCis the carriage linear velocity.VC188。 240。523 4ControllerCCWCWVariable SpeedMotorFig. 7. Control system circuit1 2 3SW4 Limit SwitchDesign 28 (2020) 234–239where NSis the screw speed, d is the screw threaddistance.It has been found [4], especially for angles between0C176 and 90C176, that the pattern is considered as a plete cover of glass on the mandrel. This has been20304050607080900 50 100 150 200 250 300 Screw speed (rpm)Angle of winding (degree)Fig. 8. Winding angle versus screw speed.for the winding machine.two layers. Samples of the final specimens of di?erentdimensions after fabrication and machining are shownin Fig. 9.. Abdalla et al. / Materials and Design 28 (2020) 234–239 239obtained after several passes of the carriage forwardand backward so that one cover will be consistingof 177。 1997.[2] Babu MS, Srikanth G, Biswas S. Composite fabrication byfilament windingan insight, 2020. Available from: [3] Hull D, Legg MJ, Spencer B. Failure of glass/polyester filamentwound pipe. Composites 1978.[4] Mallick PM. Fiber reinforced posites, materials, manufacturing and design. 2nd ed. New York: Marcel Dekker, In
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