数控技术应用专业英语教学课件作者刘小芹6.InjectionMoldingMachine幻灯片.pptVIP

 English on Mechanical Engineering Lesson 6 Injection Molding Machine Text An injection molding machine is a machine for converting, processing and forming of raw plastic material of powder, pellets into a part of desired shape and configuration. The process of injection molding consists of heating plastic material until it melts, then forcing this molten plastic into a mold where it cools and solidifies. Fig. 1 shows a straight hydraulic injection molding machine. Text Clamping unit Clamping unit is the part of an injection molding machine in which the mold is mounted , and which provides the motion and force to open and close the mold and to hold the mold closed with force during injection. This unit can also provide other features necessary for the effective functioning of the molding operation. Moving plate is the member of the clamping unit, which is moved toward a stationary member. The moving section of the mold is bolted to this moving plate. Moving plate usually includes the ejector holes and mold mounting pattern of blot holes or “T” slots. Stationary plate is the fixed member of the clamping unit on which the stationary section of the mold is bolted. Stationary plate usually includes a mold mounting pattern of bolt holes or “T” slots. Tie rods are members of the clamping force actuating mechanism that serve as the tension members of the clamp when it is holding the mold closed. They also serve as a guide member for the movable plate. Ejector is a provision in the clamping unit that actuates a mechanism within the mold to eject the molded part (s) from the mold. The ejection actuating force may be applied hydraulically or pneumatically by a cylinder (s) attached to the moving plate, or mechanically by the opening stroke of the moving plate.  Text Injection unit Injection unit converts a plastic material from a solid phase to homogeneous semi-liquid phase by