Before mold design, the designer agrees that whether plastic products conform to the principle of injection molding should be discussed in detail with the product designer. This includes a discussion of product geometry, dimensional accuracy and appearance requirements, as well as the need to minimize unnecessary trouble in two-color injection molding.
The characteristics of precision injection molding are: the size of injection parts requires high precision and small tolerance. To achieve the requirements of precision injection molding must achieve the weight conditions are
Considering the thickness of raw materials and articles, the temperature of the barrel should normally be set at a level 10-200 CD above the nominal melting temperature of the material. Amorphous materials such as PS and ABS have no specified melting point, so the barrel temperature should refer to the melt flow index (MI) and spiral process line (SPR).
In the production of plastic parts when the main reason is bad mold injection, industrial raw materials and other aspects, if the mold processing is bad, such as scars, wear, rough and other insufficient, it will be reflected in the plastic parts, plastic parts on poor luster.
First of all, PC material characteristics of high definition, good fracture toughness, stress resistance, wide range of application temperature, PC process characteristics are: melting viscosity requirements of cutting rate is small, and the requirements of temperature, no significant solution point, melting body viscosity is high, high temperature PC material and hydrolysis reaction, injection PC products will be easy to crack.
The hardness of die heat treatment is a very important mechanical property index, and the unqualified hardness is a very serious defect. After heat treatment, insufficient or uneven hardness will reduce the wear resistance and fatigue strength of the mold. Plastic mold processing manufacturers say that this will lead to early failure of the mold and seriously reduce the service life of the mold.
The injection mold structure should be reasonable. According to the drawings and technical requirements of the plastic parts, research and select the appropriate molding method and equipment, combined with the machining capacity of the factory, propose an injection mold structure plan, fully solicited opinions
1) Craft analysis of plastic parts
(2) determine the selection and molding process of molding equipment
(3) injection molding process analysis and structural design of injection molds
(4) the size of the plastic mold design
Gas auxiliary injection molding system, this advanced system and technology, is to directly inject nitrogen into the plastic plastic in the mold cavity via the segmented pressure control system, causing the internal expansion surface of the plastic parts, but still maintain the shape of the product surface Intact.