Plastic plating-influence factors of Mould Design and manufacture on plastic plating.
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. Mold design and manufacture.
In order to ensure that there are no defects on the surface of plastic plated parts, no obvious directional structure and internal stress, the following requirements should be met in the design and manufacture of moulds.
The main results are as follows: (1) the mold material should not be made of beryllium bronze alloy, but should be made of high quality vacuum cast steel. the surface of the cavity should be polished to mirror light along the exit direction, the roughness is less than 0.2 m, and the surface should be plated with hard chromium. (2) the surface of the plastic parts truthfully reflects the surface of the mold cavity, so the mold cavity of the electroplated parts should be very smooth, and the surface roughness of the mold cavity should be 1 or 2 levels higher than that of the parts. (3) parting surface, weld line and core mosaic line can not be designed on the plating surface. (4) the gate should be designed in the thickest part of the product. In order to prevent the melt from cooling too fast when filling the mold cavity, the gate should be as large as possible (about 10% larger than the ordinary injection mold), it is better to use the gate and gate with circular cross-section, and the length of the gate should be shorter. (5) exhaust holes should be left to avoid defects such as gas filaments and bubbles on the surface of the parts. (6) the ejection mechanism should be selected to ensure the smooth demoulding of the parts.
2) selection of injection machine.
Improper selection of injection machine, sometimes because the pressure is too high, the nozzle structure is not suitable or mixing makes the parts produce greater internal stress, thus affecting the adhesion of the coating.
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