Design of hot runner mould for door handle seat with glass fiber reinforced nylon composite
In the design of the mould for the car door handle seat plastic part,in order to solve the potential quality defects such as floating fibers and large warping deformation caused by shrinkage anisotropy during the molding of high content glass fiber reinforced nylon composites,the CAE auxiliary analysis method was used to optimize the molding plan of the plastic part.The gating system in the plan was optimized to be a double-submarine-gate gating system,with the gate inlet diameter of 1 mm,and the flow channel structure consisting of a three-stage-cold-runner and a hot-runner.The obtained gating effect is that the mould tempera-ture difference between the inner and outer wall that causes floating fibers is controlled below 38℃(standard value≤50℃);the probability range of fiber orientation tensor on the main appearance surface cover is 0.737 3-0.998 6,which can effectively ensure the structural strength of the cover surface;the maximum warping deformation of the plastic part is 1.024 mm,which can ensure that the forming accuracy of the key dimensions of the plastic part meets the MT3 Class A accuracy requirement;the anisotropic molding shrinkage rate of the cavity based on glass fiber reinforcement is set to 0.3%in the X direction,0.1%in the Y direction,and 0.2%in the Z direction,respectively.The optimized injection molding process parameters are as follows:mould temperature of 89.4℃,material temperature of 292.4℃,injection pressure of 92 MPa,cooling water temperature of 25℃,and injection molding cycle of 38 s.The mould structure is a two plate hot runner mould,the mould cavity layout is one mould with two cavities.Three demoulding mechanisms were designed by using the demoulding direction integration method in the mould,of which the fixed mould ejector plate lifter mechanism and the hydraulic cylinder ejector plate angle core pulling mechanism had a good reference for demoulding mechanism design of similar plastic parts.
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