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The servo injection molding machine

by:CSSSLD     2021-01-23
Wen injection tooling/VIP
motor servo motor is also called the implementation, in the automatic control system, is used as actuators, converts the received electrical signal into angular displacement or velocity of motor shaft output. Divided into two major categories of dc and ac servo motor, its main characteristic is, when the signal voltage is zero no rotation, speed decreases with the increase of torque and uniform.

general servo energy-saving injection molding machine series machines equipped with high-performance servo variable power control system, and with the rotary encoder and the power sensor was carried out on the flow and pressure feedback respectively, the high performance of synchronous servo motor by changing the rotational speed and torque to make corresponding flow pressure adjustment, closed loop control of pressure flow accurately, realize servo motor of injection molding machine energy demand the best matching and automatic adjustment. Achieve the precision of speed and pressure control ( Clamping and injection, the ejection closed loop servo control of the machine is greatly improve the response speed, repeatability precision is within 1%; The holding action for test for 10 seconds, the pressure error is not more than 10 kg) 。

in the composition of the cost of injection products, electricity accounted for a considerable proportion, according to the process characteristics of injection molding machine equipment, the traditional injection molding machine oil pump motor power consumption accounts for the proportion of the consumption is as high as 80% 90%, therefore, reduce the energy consumption of injection molding machine main contradiction is: reduce the energy consumption of the oil pump motor.

compared with the traditional injection molding machine repeatability is better, faster response speed, energy saving effect is more apparent, can power saving 20% & ndash; 80%, keeping pressure time is long and the back wall, high precision products, the effect is more significant. Economic benefit is obvious. Rapid response, stable performance of the servo motor control system, equipped with high precision high sensitive pressure feedback 臵, formation pressure precision closed-loop control, can provide customers with good product stability.

servo energy-saving injection molding machine to achieve maximum output only 0. 5 s, compared with the traditional injection molding machine apparent acceleration response, shorten the cycle, improve production efficiency. Moreover machine low calorific value, further reduce the hydraulic oil temperature, can reduce the dosage of the cooling water is about 30%, reduce noise around the machine, to strengthen the stability of the machine, to increase the service life of hydraulic oil and seal oil, makes the machine operation and maintenance cost greatly reduced, but also conforms to the current international strict environmental requirements.

with constant speed asynchronous motor to drive the quantitative pump, oil pump is a constant flow of output, but each movement of the injection molding cycle, such as opening and closing mould, ejection, plasticizing, injection and pressure maintaining, even standby is different to the requirement of traffic. Action needn't flow rate was set at the time of the low back pressure tank. Action needed for the slower, the greater the amount of flow back to the fuel tank, the more energy and waste. The same set of pressure, the greater the flow back to the bigger the waste tank. Wasted energy into heat energy, the oil temperature increase. In the injection molding cycle, the quantity of oil required for the pressure is very low, because of the speed of the screw forward only need enough to fill the finished product is cooling shrinkage, estimated that not more than 5% of the oil pump flow, the oil pump more than 95% of the flow in the low back pressure maintaining pressure tank. The finished wall thickness, the greater the pressure maintaining time is longer, the more energy and waste. From another point of view, can be the bigger the range of energy saving, or back to this period of energy saving additional investments in the shorter.

servo energy-saving system for execution of the injection molding operation, first condition to have precise control ability and reaction sensitivity. When a pressure control and speed control, servo motor oil pump energy saving system group to suck out quickly from inside the tank will pump, to provide each unit to perform work needs. The advantages and disadvantages of hydraulic power system control performance can be made by the motor pump set the steady-state control of pressure, speed, sensitivity and dynamic response response handling to discrimination.

in the process of injection molding, shoot the rubber and the holding stage to influence forming quality is the most important two stages, stage of injection molding is given priority to with speed control, pressure limit is complementary, cavity filling, aims at rapid speed beyond the amount is too large or long reaction time is possible to cause the defects of products, such as stress concentration, finished products mould etc. Because melt filling pressure stage, only to melt the contraction of the stability of the compensation, thus forming is given priority to with pressure control, the speed limit is complementary, as far as possible to avoid compensation pressure forming density inhomogeneity caused instability breeds such as unequal stress problem.

early injection molding machine is given priority to with full hydraulic pressure type, for energy saving and environmental protection contribute significantly weaker, servo injection molding machine to energy saving and environmental protection contribution on a gift, so the servo system of energy conservation and environmental protection is also the most potential equipment technology at the moment.
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