Thermal characteristics of injection molding machine is plastic and metal melt die-casting molding principle to combine a kind of special equipment. The original plunger type injection molding machine, to 40 s to develop the plasticizing screw injection moulding machine. Since then, the focus of the development is mainly around the screw injection molding machine is plasticizing, has to appear after double screw, exhaust type and other advanced forms.

In 1980 France produced at that time, the world's largest screw plastic injection molding machine, injection capacity up to 170 kg at a time. From 80 s to the recent years, the development of injection molding machine mainly concentrated in several aspects: the subtle automation control system and various ancillary equipment in the application of automatic molding; With the precision machinery and high-performance hydraulic system; The development of various special injection molding machine and computer aided design of complex shape parts plastic flow analysis to determine the best conditions of plastic injection; All kinds of energy saving technology in the application of injection molding machine.

1、First, the principle of injection molding machine

Injection molding machine for short

Injection molding is the use of thermal physical properties of plastics, the material from the hopper to join cylinder, cylinder by heating coil heating, melting of material, with outer power within the cylinder under the action of motor driven rotary screw, screw shear under the dual function of the material gradually plasticizing, melting and homogenization, when screw rotation, the materials in receiving friction force and shear force, under the action of pushing has molten material to the screw head, at the same time, screw back under the adverse effects of the material, to form the screw head store material space, complete plasticizing process, and then screw in the injection cylinder piston under the action of reasoning, with high speed, high pressure, the store is indoor material melt through the nozzle of the injection into the mold cavity, the cavity of the molten material after pressure maintaining and cooling, curing finalize the design, mold under the effect of clamping mechanism, open mould, and through the ejection device to finalize the design good products sets out from the mold.

2、Second, the structure analysis of injection molding machine

Injection molding machine according to the request of belongs to the injection molding process is a mechanical and electrical integration model, is mainly composed of injection parts, mould parts, frame, hydraulic system, heating system, control system, feeding device, etc.

At present, the common forms of single cylinder injection device and double cylinder type.

Plasticizing unit has a plunger type and screw type two kinds. Plastic in the process of continuous drive rotary screw, realizing the change of physical state, was finally molten into the cavity. Therefore, the plasticizing unit is complete uniform plasticizing, realize the core component of quantitative injection.