What is Injection Molding Machine?
What is Injection Molding Machine?
An injection molding machine or injection
An injection molding machine or injection press, is a machine for manufacturing plastic products by the injection molding process.Injection molding is a method to obtain molded products by injecting plastic materials molten by heat into a mold, and then cooling and solidifying them.
The method is suitable for the mass production of products with complicated shapes, and takes a large part in the area of plastic processing.
Application:Injection molding is used to make widely used products in plastic, including almost all plastic items like household items For example bottle,bottle top tub,bucket,container,boxes,tops as well as remote control casings, syringes and more. It is also commonly used for manufacturing larger items such as car body panels.
Parts of the Injection molding machine
The main parts are material hopper, barrel, an injection ram/ rotating screw type plunger, heating device (heater), movable pattern, ejectors, and a mold inside mold cavity.
The process of injection molding is divided into 6 major steps as shown below.
1. Clamping
2. Injection
3. Dwelling
4. Cooling
5. Mold opening
6. Products Removal
How does it work?
Injection molding machine is divided into 2 units
1. A clamping unit and
2. An injection unit.
Clamping unit
The functions of the clamping unit are opening and closing a die, and the ejection of products. There are 2 types of clamping methods,
1. the toggle type and
2.the straight-hydraulic type in which a mold is directly opened and closed with a hydraulic cylinder.
Injection unit
The functions of the injection unit are to melt plastic by heat and then to inject molten plastic into a mold.
The screw is rotated to melt plastic introduced from the hopper and to accumulate molten plastic in front of the screw . After the required amount of molten plastic is accumulated, the injection process is started.
While molten plastic is flowing in a mold, the machine controls the moving speed of the screw, or injection speed. On the other hand, it controls dwell pressure after molten plastic fills out cavities(It is called Dwelling).
The position of change from speed control to pressure control is set at the point where either screw position or injection pressure reaches a certain fixed value.
After Dwelling the mold will cool the plastic.(It is called Cooling)after that mold will be opened (It is called Mold Opening) and then Product Removed from the machine(It is called Products Removal Process).
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