模具设计外文翻译--注塑成型(6)

e next part of the rotational part, is responsible for this part of molten material by shear. In this part, threaded depth constantly decrease, compression cladding material. Last part is measurement profile, this part of the threaded depth shallow, improve the quality of the melt and color of the distribution. In the screw front are able to let screw as extruder and piston check valves. When injected screw retrograde injection, stop order to form will guide material flow to the device of the screw front line to become a molten material pool or injection. The injection, check device to prevent injection flow back to screw parts. When injected began to establish and cooling time end, mould open. Mould open must abide by the slow - fast - slow. Molds must slowly opened to release the injection produces in the process of vacuum to prevent parts stay in fixed modules. Because of mobile launch system in fixed mode, so try to avoid this kind of circumstance. Then quickly open mold, if not using machine hand, mould only need to open enough to remove the parts distance. End must slow down to compensate mould impulse. If you don't slow down machine speed cannot accurate positioning, impact may damage the machine. When the mould opened, putting forward