Injection molding machine component

Fig. 3. Basic hydraulic (toggle clamp) injection-molding machine components. Illustration by John W. Bozzelli Rick J. Bujanowski.

The SCORIM process employs a unique hardware component that is retrofitted to a conventional injection molding machine. Located between the injection nozzle and the mold, this unit contains a pair of pistons that exert pressure on the melt after it is injected... 

Molded articles, which are conventionally manufactured in presses with high viscosity rubber, have been recently manufactured in automatic injection molding machines using liquid silicone rubber, which enables the mass production of silicone rubber components with short cycle times. 

Fluoropolymers can be injection-molded in plunger or ram-type equipment but a screw machine works best with this family of plastics. The screw-type injection molding machines have a number of advantages including those listed in Table 6.23. Various components of screw-type machines for processing fluoropolymers are described in this section. 

These functions must be performed automatically under conditions that ideally should result in a high quality and cost-effective part. Injection molding machines have two principal components to perform the cyclical steps in the injection molding process. These are the injection unit and the clamp unit (Figure 11.4). We now describe the operation of the various units of the injection molding machine... 

The operation of the injection and clamp units and other components of the injection molding machine (opening and closing of the mold and melting and injection of the polymer material) requires power, which is supplied by an electric motor. The orderly delivery of this power depends on auxiliary systems the hydraulic and control systems. The hydraulic system, the muscle for most maehines, transmits and controls the power from the electric motor to the various parts of the maehine. Maehine functions are regulated by a careful control of the flow, direction, and pressure of the hydraulic fluid. The elements of the hydraulic system for most injection molding machines are essentially the same fluid reservoir, pumps, valves, cylinders, hydraulic motors, and lines (Figure 11.8). 

The size of injection molding machines is usually specified in terms of injection capacity and clamp force. These factors are not directly related. Other important variables are the L D (length to diameter) ratio, barrel size, plasticizing rate, injection rate, and injection pressure. Major components of injection molding machines include the injection unit, the clamp unit, and the machine base which contains the power and control units. 

The main component of an injection-molding machine are (1) the injection unit which melts the molding material and forces it into the mold (2) the clamping unit which opens the mold and closes it under pressure (3) the mold used and (4) the machine controls. 

IMM with an oil hydrauUc system provides the power to turn the screw to plasticate the plastic, inject the melt into the mold cavity, close the mold clamp, hold clamp tonnage, release the clamp, and eject the molded part. A number of hydraulic components are required to provide this power, including motors, pumps, directional valves, fittings, tubings, and oil reservoirs/tanks. See drive-system control hydraulic fluid influenced by heat, injection molding machine hydromechanical clamp See clamping, hydromechanical. 

Most thermosets are molded with the compression or transfer molding process (tires, dinnerware, electrical components, etc.). Some products, usually iimdler ones, can be made using the injection molding process in specially 1 or modified injection molding machines. Some thermosets are used as Is, applied to sheets or mats of glass and other fibers, and then cured under low) pressure and heat. (Examples are plywood, particle board, structures, etc.)... 

An extruder. Fig. 17, has essentially the same structural components as the plasti-fication unit in a screw-type injection molding machine. Fig. 11. The screw in this case is not an axial plunger in the extruder it only rotates. The significance of extrusion per se is the continuity of the process. The method is used to produce plates, tubing, profiles, films, etc. 

What major components make up an injection molding machine ... 

Figure 2-5 Two-component injection molding machine (Photo Ferromatik Milacron)...

An injection molding machine consists of the following major components plasticating unit/injection unit, mold, controls, and. ... 

Lessons 2 through 6 introduced the components of an injection molding machine with which the material is formed from the pelletized raw material into the finished injection-molded part. 

Any injection molding machine (Fig. 3) can be broken down into the following basic components (1) injection units, (2) clamping unit, (3) control system, and (4) tempering devices. The process of injection molding typically consists of the following steps ... 

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