Flat-panel TVs side frame forming of new technologies - high-gloss coating-free Seamless Injection Molding (The Second part )
Highlight injection mold
High light injection mold design, mold machining of steel should be selected to have a higher than normal-mode requirements. Mold design to consider high-temperature design, suitable for circuit design and installation of matching and other factors. Waterways need to ensure rapid heating and cooling, and to mold the temperature more uniform, the general close to the cavity with the shape of the waterway, and in the back of increasing thermal insulation or the use of the gap (shown in Figure 2). Mold gate design should be to minimize weld lines, and contribute to the exhaust and reduce shear. On the use of oil-heated mold temperature machine mold gate size to a larger opening than for other line-bit, coordination and orientation and other parts of the requirements to be considered high, pay attention to thermal insulation or cooling and co-ordination. Since mold requires a very high surface finish (up to mirror effect), and therefore required to use polished steel mold, good, high-purity, high-degree mirror and heat deformation small, high-quality steel, such as Sweden ASSAB the S136, Japanese Datong NAK80 . If the forming flame-retardant high-gloss materials, mold steel needed a good corrosion resistance, it is best to use S136SUP or the same grade of steel.
For the high-light mold maintenance, pay attention to the timely use of clean mold parting line and exhaust ducts, so as to avoid undesirable exhaust. In addition, from time to time Otherwise clean cloth or paper with special cleaning mold mirror part, especially in high-gloss flame retardant plastic materials, make clear the adhesion of the mold surface precipitates avoid the appearance of white mist so bad. Injection is completed must also be cleaned with special cleaning agent cavity, and special anti-rust oil spray.
