Effect of Process Parameters on Shrinkage and WarPage of Rapid Heat Cycle Molding Plastic Part

Abstract

Abstract: Abstract： In order to define the effect of process parameters on shrinkage and warpage of large flat plastic parts by rapid heating cycle molding (RHCM), taking an airconditioning 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 warpage. Besides, the influence law of other process parameters on shrinkage and warpage at different mold temperatures was also studied. The results show that volumetric shrinkage and warpage 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 warpage temperatures, volumetric shrinkage and warpage of the product increase quasilinearly with the melt temperature rising, but decrease with the packing pressure increasing. However, they fluctuated within a narrow range with the packing time increasing.

Key words: process parameter, shrinkage, warpage, Key words： large flat parts, rapid heat cycle molding (RHCM)

CLC Number:

TQ 320.66

WANG Menghan,LI Yanzhao,LIU Xiao,XIA Zhizi,CHEN Mingliang. Effect of Process Parameters on Shrinkage and WarPage of Rapid Heat Cycle Molding Plastic Part[J]. Journal of Shanghai Jiaotong University, 2016, 50(02): 235-240.

References

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