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Why is it called a high-speed high-speed injection molding machine?

TIME:2021-04-16 Share

Ordinary injection molding machines are hydraulic injection molding machines, and hydraulic injection molding machines are relatively slow. High-speed injection molding machines are neither ordinary machines nor servo machines. The difference between them is the difference in speed, and the positioning accuracy of high-speed injection molding machines is more precise.

The role of the injection system: the injection system is one of the most important components of the injection molding machine.

At present, the most widely used is the screw type: the plasticizing device of the screw injection molding machine is mainly composed of a feeding device, a barrel, a screw, a rubber component, and a nozzle.

injection molding machine
In actual use, more and more customers will ask to buy the so-called "high-speed machine" or "fast machine". In addition to the needs of the product itself, most of the others are to shorten the molding cycle and increase the output per unit time, thereby reducing production costs and improving competitiveness.

To achieve the above objectives, there are several ways:
①. Speed ​​up the injection: increase the motor and pump, or add a pressure accumulator (preferably closed loop control);
② Speed ​​up the feeding speed: increase the motor and pump, or reduce the feeding hydraulic motor to speed up the screw speed;
③. Multi-loop system: adopts double-loop or triple-loop design to synchronize compound actions and shorten the molding time;
④. Increase the mold waterway to improve the cooling efficiency of the mold.
Although the improvement and modification of machine performance can increase production efficiency, it also often increases investment costs and operating costs.
Therefore, the benefit evaluation before investment needs to be carefully measured in order to produce the highest benefit with the most suitable model.

In the screw metering full stroke, first high speed and low back pressure, then switch to lower speed and higher back pressure, then switch to high back pressure, low speed, and finally plasticization under low back pressure and low speed. In this way, most of the pressure of the molten material in the front of the screw is released, and the rotational inertia of the screw is reduced, thereby improving the accuracy of screw measurement.

Excessive back pressure often results in increased discoloration of the colorant, increased mechanical wear of the pre-plastic mechanism and barrel and screw, prolonged pre-plastic cycle, and decreased production efficiency. The nozzle is prone to drooling, and the amount of recycled material increases.

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