Design of dual-color inverted hot runner injection mould for automobile air conditioning control panel
As an indispensable operating part of the human-machine interface,the automobile air conditioner control panel had been generally designed as a dual-color injection moulding part in order to integrate multiple requirements such as functionality and aesthetics.Taking an automotive interior air conditioning control panel as an example,a pair of dual-color inverted hot runner injection moulds were designed,and the structural characteristics of the parts,the mould structure design scheme and the working principle were introduced in detail.Due to the special structure of the part and the difference in the temperature of the injection moulding materials,the surface of the plastic parts in the moulding process using the traditional orthotropic moulding solution was prone to defects such as stringing of colors,stress marks.Because of a low moulding yield,so the mould adopted the inverted struc-tural design,the first color was moulded into the tawny transparent polycarbonate(PC)appearance part first,and then the second color was moulded into the black PC/acrylonitrile-butadiene-styrene copolymers(ABS)substrate part.Based on the inverted struc-ture of the mould,both the first and second colors were fed by hot runner system.Meanwhile,in order to ensure the smooth produc-tion and ejection of the parts,a pulling sprue and a pre-pressure demoulding mechanism were set up in the first color sub-mould,and the second color sub-mould was designed with a joint demoulding mechanism including angle from pins and ejector pins,which was driven by a cylinder to achieve the release of the moulded parts.Practice has proved that the overall structure of the inverted dual-color hot runner injection mould is stable and reliable,and the quality of the mass production of plastic parts meets the design requirement.
air conditioning control paneldual-color mouldinginverted mouldhot runnerjoint demoulding mecha-nism
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