Средняя пластина фазовращателя

Материал:BPT+ASA GF30

Что такое литьё под давлением?
Литьё под давлением — это технологический процесс производства деталей путём впрыска расплавленного материала в форму или матрицу. Литьё под давлением может осуществляться с использованием самых различных материалов, главным образом металлов (в этом случае процесс называется литьём под давлением), стекол, эластомеров, кондитерских изделий, а также наиболее распространённых термопластичных и термореактивных полимеров. Материал для детали загружается в нагретый цилиндр, смешивается при помощи винтового шнека и впрыскивается в полость формы, где затем охлаждается и затвердевает, принимая форму этой полости. Литьё под давлением широко применяется для изготовления самых разнообразных деталей — от мельчайших компонентов до целых кузовных панелей автомобилей. Благодаря достижениям в технологии 3D‑печати, использующей фотополимеры, которые не плавятся при литье под давлением некоторых термопластов, работающих при более низких температурах, возможно применение таких материалов для некоторых простых форм литья.

How many plating surface treatments are there for injection molded parts?
ABS plastics are usually used for electroplating of plastic parts. The general processes are degreasing, roughening, sensitization, activation, electroless nickel or electroless copper plating, thickening of copper plating, and surface layer plating. The surface layer generally includes nickel, chromium, imitation gold, etc., depending on needs.
What is the performance of PBT polybutylene terephthalate?
Типичный диапазон применения:
Household appliances (food processing blades, vacuum cleaner components, electric fans, hair dryer housings, coffee utensils, etc.), electrical components (switches, motor housings, fuse boxes, computer keyboard keys, etc.), automotive industry (radiator grilles) , Body panels, wheel covers, door and window parts, etc.).
Режимы процесса литья под давлением:
Drying treatment: This material is easily hydrolyzed at high temperatures, so the drying treatment before processing is very important. The recommended drying condition in the air is 120°C for 6~8 hours, or 150°C for 2~4 hours. The humidity must be less than 0.03%. If you use a moisture-absorbing dryer to dry, the recommended conditions are 150°C for 2.5 hours.
Melting temperature: 225~275℃, recommended temperature: 250℃.
Mold temperature: 40~60℃ for unreinforced materials. It is necessary to design the cooling cavity of the mold well to reduce the bending of the plastic part. The heat loss must be fast and even. It is recommended that the diameter of the mold cooling channel is 12mm.
Injection pressure: medium (up to 1500bar).
Injection speed: The fastest possible injection speed should be used (because PBT solidifies quickly).
Runner and gate: It is recommended to use a circular runner to increase the pressure transmission (empirical formula: runner diameter=plastic part thickness + 1.5mm). Various types of gates can be used. Hot runners can also be used, but care must be taken to prevent leakage and degradation of materials. The gate diameter should be between 0.8~1.0*t, where t is the thickness of the plastic part. If it is a submerged gate, the recommended minimum diameter is 0.75mm.
Химические и физические свойства:
PBT is one of the toughest engineering thermoplastic materials. It is a semi-crystalline material with very good chemical stability, mechanical strength, electrical insulation properties and thermal stability. These materials have good stability under a wide range of environmental conditions. PBT has very weak moisture absorption properties. The tensile strength of unreinforced PBT is 50MPa, and the tensile strength of glass additive PBT is 170MPa. Too much glass additives will cause the material to become brittle. PBT; crystallization is very rapid, which will cause bending deformation due to uneven cooling. For materials with glass additives, the shrinkage in the process direction can be reduced, but the shrinkage in the direction perpendicular to the process is basically the same as that of ordinary materials. Generally, the shrinkage rate of materials is between 1.5% and 2.8%. Materials with 30% glass additives shrink between 0.3% and 1.6%. The melting point (225°C) and high-temperature deformation temperature are lower than those of PET materials. The Vicat softening temperature is approximately 170°C. The glass transition temperature (glass trasitio temperature) is between 22°C and 43°C. Due to the high crystallization speed of PBT, its viscosity is very low, and the cycle time of plastic parts processing is generally low.