Plastic processing affects electroplating: due to the injection molding conditions,the design of the injection molding machine,the design,the product,and the mold can have different levels and internal stresses in different parts,so that the plastic parts will cause insufficient local roughening and metalization After activation,the metallization layer eventually falls and is not resistant to collision and adhesion strength.The test results show that the heat treatment of the entire agent can effectively reduce and eliminate the internal stress of the plastic parts,so that the bonding force of the coating can be increased by 20 ~ 60%.Improper injection molding machine selection,sometimes due to excessive pressure,improper nozzle structure or material mixing Large internal stress,which affects the adhesion of the coating.
Mold design and manufacturing: to ensure that there are no defects on the plastic surface,no obvious directional structure and internal stress,the following requirements should be met in the design and manufacture of injection mold molds.The mold material should not be made of beryllium bronze alloy.It should be made of high-quality vacuum cast steel.The surface of the cavity should be polished with a mirror surface in the direction of the injection mold,and the roughness should be less than 0.2m,and the surface should be hard chrome plated.
The surface of the plastic part truly reflects the cavity surface.Therefore,the mold cavity of the electroplated plastic parts should be very smooth,and the surface roughness of the cavity should be 1 ~ 2 higher than the surface roughness.The parting surface,welding and core wire cannot be designed on the surface of the coating.The door should be designed in the thickest part.In order to prevent the melt from filling the cavity and the cooling rate is too fast,the gate should be as large as possible.It is best to use a round gate and runner,and the runner length should be short.Exhaust holes should be kept to avoid any defects such as gas filaments and air bubbles on the surface of the parts.When selecting the demoulding mechanism,ensure the smooth removal of parts.
