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| Effect of Process Parameters on Shrinkage and WarPage of Rapid Heat Cycle Molding Plastic Part |
| WANG Menghan,LI Yanzhao,LIU Xiao,XIA Zhizi,CHEN Mingliang |
| (College of Material Science and Engineering, Chongqing University, Chongqing 400030, China) |
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Abstract Abstract： In order to define the effect of process parameters on shrinkage and warpage of large flat plastic parts by rapid heating cycle molding (RHCM), taking an airconditioning panel plastics as an example, MOLDFLOW was used to establish the finite element model and to conduct simulation and analysis. By using Taguchi methods, the effect of process parameters such as melt temperature, packing pressure, heating time, packing time, cooling time and injectiontime on the comprehensive quality was studied. The single factor experiment method was applied to analyze the effect of mold temperature on shrinkage and warpage. Besides, the influence law of other process parameters on shrinkage and warpage at different mold temperatures was also studied. The results show that volumetric shrinkage and warpage decrease apparently with mold temperature rising to the thermal deformation temperature of the polymer material. The comprehensive quality is the best of all when the heating time is 35 s. At different mold warpage temperatures, volumetric shrinkage and warpage of the product increase quasilinearly with the melt temperature rising, but decrease with the packing pressure increasing. However, they fluctuated within a narrow range with the packing time increasing.
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Received: 11 November 2014
Published: 29 February 2016
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