Injection friend electric injection molding machine and traditional injection molding machine energy-saving comparison

In recent years, with the expansion of the market scope, high-precision injection molding market and increasing awareness of environmental protection, injection molding will its long-term injection molding operations, so that the advantages of compression molding machine in the traditional injection molding machine and injection molding machine has been largely eliminated, and the main advantages of injection molding machine in the traditional injection molding machine and injection molding machine has greatly exceeded the main models of injection molding machine and injection molding machine in the past. Energy-saving, environmentally friendly injection moulding machines

I. High precision, good repeatability and long-term stability

Sumitomo's all-electric injection moulding machines are characterised by high precision and repeatability compared to hydraulic machines. High precision injection moulding can be easily achieved on an all-electric servo injection moulding machine. When plastic is being plasticised, the rotation of the screw is driven by a servo motor, which has a stable speed; therefore, the stability of the plasticisation plasticisation is improved. The injection action is performed by a servo motor driving a ball screw. As the position accuracy of the ball screw can reach less than one ten thousandth of a degree, Sumitomo's direct drive structure allows the servomotor, ball screw and screw to form a single unit with positioning accuracy. It tends towards zero error, so each injection action can be accurate to less than one part in ten thousand accordingly. The accuracy of other machines using the belt indirect drive construction is not as direct as the direct drive, but the results are far superior to a hydraulic circuit with a long hydraulic control oil circuit running.

At the same time, the repeatability of the injection action is greatly improved, ensuring consistent product quality. In contrast to the pressure control method of hydraulic injection machines, the injection pressure of all-electric servo injection machines is fed back to the control system via a high-precision pressure transducer, which is directly connected to the screw. This reduces the errors caused by intermediate links; the sensing speed is fast and accurate; this results in improved backpressure control accuracy for this type of machine. The connection between the ball screw and the screw is rigid and the injection speed is completely controlled by the ball screw; therefore, high precision and complex multi-stage pressure and multi-stage speed can be easily achieved by setting the pressure and speed for each part of the injection process. The injection action can meet a wide range of injection moulding requirements for a variety of high-end products.

Most precision parts, such as automotive parts, are processed by fully electric injection moulding machines. Due to the high precision of the servo motor torque control, the ball screw is rigidly connected to the clamping system; the speed and position accuracy of the opening and closing modes are improved accordingly, which ensures the accuracy of the mould movement thrust and controls the mould displacement during the movement inertia. This deviation allows for much greater reliability and responsiveness in the protection of low-pressure moulds and better safety for precision moulds. In the injection moulding of some thin-walled products, an "injection - single press" compound action is required, whereby the mould is not tightened at the start of the injection, leaving a small gap for venting, and the mould is tightened at the end of the injection operation.

For example, when IC cards are injection moulded in ABS, the "one-shot" compounding action produces a product with a high degree of flatness and no warpage. These movements require a high degree of positional accuracy and responsiveness of the formwork movement. As the mould has recently been tightened, only a small clamping force is required to shape the product, which extends the life of the injection moulding machine and mould. Fully electric injection moulding machines are perfectly suited to these requirements. With oil pressure, the physical properties of the hydraulic oil, such as density, vary with ambient temperature and the number of uses, so accuracy in each action cannot be guaranteed and long-term accuracy and stability are difficult to maintain.

Grease for Sumitomo machines: MYS-7,700G,yellow lubricating grease

II. The cost of long-term use is much lower than that of an oil press.

Conventional hydraulic injection moulding machines need to be industrialised through the oil circuit for all movements and inevitably have flow losses such as oil pressure control losses, tube losses, valve resistance, as well as pump volumetric efficiency and friction losses. This energy loss is particularly noticeable at high flow rates. According to statistics, high pressure oil savings in hydraulic injection moulding machines result in energy losses of up to 30%, and these losses are still present in hydraulic systems in standby mode.

The all-electric servo motor has no flow losses, control loss problems, no rotation in standby and low energy consumption. The all-electric series uses ball screws to convert the rotary motion of the servo motor into linear motion, and the frictional resistance of the ball screw is much lower than that of a hydraulic cylinder without any cooling system; therefore, the overall efficiency far exceeds that of a hydraulic press. A cost comparison table is attached for illustrative purposes.

Under normal circumstances, the difference between the purchase cost of an all-electric injection moulding machine and a hydraulic compressor of the same level can only be compensated by cost savings within the first three to five years of use.