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Plastic injection molding machine is also called plastic injection molding machine or plastic injection machine. It is the main molding equipment that uses plastic molding dies to make thermoplastics or thermosets into plastic products of various shapes.
Divided into vertical, horizontal, and all-electric. The plastic injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it eject and fill the mold cavity.
Horizontal injection molding machine▲
Vertical injection molding machine▲
Working principle and operation of plastic injection molding machine
Plastic injection molding machine is a process of injecting plasticized plastic in a molten state (ie viscous flow state) into a closed mold cavity with the help of the thrust of a screw (or plunger), and obtaining the product after solidification and shaping. Injection molding is a cyclic process, each cycle mainly includes: quantitative feeding-melting and plasticizing-pressure injection-filling and cooling-mold opening and taking parts. After taking out the plastic part, the mold is closed again for the next cycle.
Locking and closing the mold: The mold board is quickly approached to the fixed mold board, and after confirming that there is no foreign matter, the system is turned to high pressure, and the template is locked.
The shooting platform moves forward: the shooting platform advances to the specified position.
Plastic injection: The screw can be set to inject the molten material at the front end of the barrel into the mold cavity at multiple speeds, pressures and strokes.
Cooling and holding pressure: According to the setting of various pressures and time periods, the pressure of the barrel is maintained, and the cavity is cooled and formed.
Cooling and pre-molding: The products in the mold cavity continue to cool, while the hydraulic motor drives the screw to rotate to push the plastic particles forward. The screw retreats under the control of the set back pressure. When the screw retreats to the predetermined position, the screw stops rotating, and the injection cylinder presses The setting is loosened, and it is expected to end.
The shooting table retreats: After the pre-plasticizing, the shooting table retreats to the designated position.
Mold opening: The die plate moves back to the original position.
ejection: the ejector pin ejects the product.
The advantages of injection molding method are fast production speed, high efficiency, operation can be automated, variety of colors, shapes can be from simple to complex, size can be from large to small, and the size of the product is accurate, the product is easy to update, and it can be made into complex shapes. Parts and injection molding are suitable for mass production and molding processing fields such as products with complex shapes.
Mold protector, also known as mold monitor and electronic eye, is mainly a mold protection system that monitors, controls and detects the operating conditions of various injection molding machines in real time. It can effectively protect expensive molds, can effectively detect whether the product is qualified, and check whether there are residues before closing the mold to prevent the mold from being pinched.