Polycarbonate (PC) is an engineering plastic with excellent performance. It not only has high transparency and excellent impact toughness, but also is creep-resistant, non-toxic, has a wide operating temperature range, good dimensional stability, excellent electrical insulation and good weather resistance, so it is widely used in instrumentation, lighting appliances, electronic and electrical equipment, household appliances, packaging and other industries. In addition, with the rapid advancement of polymer material technology, new modified varieties of polymer materials continue to emerge, which also greatly expands its application fields. At the same time, its processing technology has attracted more and more attention from all aspects.
Tag: injection molding pressure
Base is similar to a semi-enclosed box-shaped piece. Coil is installed inside box surrounded by vertical ribs. Outer side where vertical ribs are located and B and C surfaces are exterior surfaces. No push rod marks or obvious parting lines are allowed. End surface where height of vertical rib is located is mating surface with upper shell. Try to avoid setting flat push rods. Side A is installation surface. Bottom surface must be horizontal, a push rod or parting surface can be set. In order to realize two functions of contactor rail installation and screw installation, this plastic part is designed with 2 dovetail grooves and 4*φ5.2mm through holes. In order to be consistent with installation dimensions of other models of contactors, distance and position of 4*φ5.2mm holes cannot be changed, resulting in 2*φ5.2mm holes penetrating dovetail groove that needs to be formed by side core pulling. This is a difficulty in mold design. Material of plastic part is reinforced flame-retardant nylon. Vertical ribs have a large area, a high height, and a thin wall thickness of only 1.2 mm. Allowable draft angle is small, plastic part is easy to stick to mold and trap air during molding. φ14mm hole and fan-shaped side hole are heat dissipation holes, which are located on appearance surface and need to be formed by side core pulling. How to ensure smooth forming and demoulding of vertical ribs and side holes, while ensuring that there are no push rod marks or obvious parting lines on appearance, is also a difficult point in mold design. 3.0, 9.3, and 12.8mm slots are clamp installation slots and require side core-pulling molding.
36 common plastic raw materials molding temperature that you must know 1. Select appropriate sprue and gate according to fluidity. 2. Select appropriate fusion state for gate location. 3. Due to high pressure forming, retraction inclination must be above 2°. 4. Shrinkage in plastic injection molding must be around 0.5%. 5. Commonly used for gold-plated products, following matters are as follows:
Gas mark is a quality defect that is easy to produce and difficult to eliminate. Gas mark not only affects appearance of product, but also affects strength of product. Relevant domestic technical data does not involve much of mechanism of generating gas mark. When operator encounters specific problems, he cannot quickly find cause of problem. He do not know what process measures to take, problem cannot be solved in time, resulting in a large amount of waste of resources which will cause huge losses to enterprise.
Gud Mould 