Injection molding machine is a kind of special equipment which combines the thermal processing characteristic of the plastic and the molten metal of the metal. The first plunger type injection molding machine, to the end of 40s to develop a pre - plastic screw injection molding machine. Since then, the focus is mainly on the development of pre plastic screw injection molding machine, after the line has been a double screw, exhaust and other advanced forms.
1980 France made the world's largest screw injection molding machine, an injection capacity of 170kg. From 80s to the last few years, the development of the injection molding machine mainly concentrated in several aspects: Micro automation control system and auxiliary equipment in a variety of applications in automatic molding; with precision machinery and high performance hydraulic system; all kinds of special injection molding machine and the development of computer aided design of complex shaped parts to determine the injection molding of plastic flow the most excellent; a variety of energy-saving technology in the injection molding machine.
First, the working principle of injection molding machine
Injection molding machine for injection molding machine.
Injection molding is the use of thermal physical properties of plastics, the material from the hopper into the barrel, the barrel by the heating coil heating, the material melting is arranged in the outer power motor drive under the action of the rotation of the screw in the barrel, the dual role of the material in the screw shear gradually under the plasticization, melting and homogenization, when the screw rotates, the material in a low friction force and shear force, push melted materials to the head of the screw, screw back in at the same time, reaction material, screw head forming material storage space, complete the plasticizing process, then the injection screw in the cylinder under the action of reasoning, with high speed and high pressure. The molten material in the storage compartment by cavity injection nozzle to the mold cavity, the molten material after pressure, cooling, solidification, in mold clamping mechanism under the action of open mode Out, and through the ejection device to shape good products from the top into mould.
Two, injection molding machine will be composed of structural analysis
The injection molding machine according to the requirements of the injection molding process is a strong electromechanical integration model, mainly by the injection mold parts, body parts, hydraulic system, heating system, control system, charging device etc..
At present, the common ear injection device with single cylinder and double cylinder type.
The plastic parts are plunger type and two screw type. In the process of continuous pushing of the rotating screw, the plastic realizes the change of the physical state, and finally the plastic is injected into the mold cavity. Therefore, the plastic part is the key part to realize the uniform plastic injection and realize the quantitative injection.