Simple parts are easily made. But, complex parts are often quickly made using this method, too, because the high pressures of injection molding, force material into every nook and cranny of the tool (mold) this cannot be done efficiently with other casting methods. Because injection molding is high semi-permanent mold casting, that is, adding casting materials struggling, it’s possible to cast a wider range of details into the planning of the part over other casting methods The manufacturing process of injection molding itself is fairly simple. Small plastic pellets are fed into a hopper. The pellets are then crushed and heated into a thick plastic slag. The recently melted slag is fed into a piston which injects the liquid under very high into a metal die.
Please read the originial post here: https://www.flamingfoundry.com/category/permanent-mold-casting