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In recent years, the mature and cost reduction of high power and large torque servo motor and driving technology have promoted the more and more applications of the related electric servo drive devices. The CNC bending machine widely used in the sheet metal industry has opened the new trend of the main drive of the pure electric servo system instead of the main hydraulic drive, and the tonnage and production of the pure electric servo CNC bending machine are becoming more and more large. This paper expounds the advantages of the pure electric servo bender compared with the hydraulic bending machine from the aspects of energy saving, environmental protection, machining efficiency, bending accuracy and maintenance cost. The pure electric servo bending machine is a developing trend. But now it is immature, we can see the advantages of this bending machine and get the trend of development.
One of the advantages of the pure electric servo drive technology is that the input power of the motor is proportional to the load power, and the power consumption is large at the time of bending. When the slider is empty, the power consumption is small. When the slider stops, it does not consume the electricity. But the main motor and hydraulic pump of hydraulic servo bender are running continuously, even if the slider does not work.
In addition, the mechanical transmission efficiency of the pure electric servo bending machine is more than 95%, the hydraulic transmission efficiency of the hydraulic servo bending machine is less than 80%, and the efficiency of the hydraulic system components is lower after aging and wear. Taking the 100t bending machine as an example, the power consumption of the mainframe of the pure electric servo bending machine is about 12kW. H/d according to the working 8h for one day. The power consumption of the hydraulic bending machine is about 60kW. H/d, and the energy saving of the pure electric servo bending machine is about 80%.
The pure electric servo bending machine does not use hydraulic oil, does not replace the trouble of hydraulic oil and dismantling hydraulic components. It also has no replacement, dismantling process and the daily hydraulic
The response speed of the servo motor is faster than that of the hydraulic servo. Taking the 100t pure electric servo bending machine developed by the Kaifeng numerical control company as an example, the backstroke and fast speed of the slide block are up to 200mm/s and the working speed is 0 to 20mm/s; the overwhelming majority of the same tonnage hydraulic bending machine is below 120mm/s and the speed is below 120mm/s, and the working speed is 10mm/s. The hydraulic servo bending machine is affected by the heating of the environment and the hydraulic system. It is necessary to open the machine to preheat or stop the heat. Once the hydraulic system has a fault, it can find the technical requirements of the troubleshooting and the long time. The
pure electric servo bending machine has few components and low failure rate. There are no such problems at all.
Therefore, the efficiency of the pure electric servo bending machine is nearly 1 times higher than that of the same tonnage hydraulic bender.
The bending speed of the pure electric servo bending machine can be adjusted. It can bend to different thickness, different material and different bending length, set more appropriate bending speed, improve bending precision and maintain high productivity. The deflection compensation shaft of the pure electric servo bending machine adopts the VILA structure compensation device, and the bending accuracy is higher.
The hydraulic oil of the hydraulic bending machine needs to be replaced regularly; the pump, valve and seal are easily broken, easily damaged, the hydraulic system is easy to pollute, and it is difficult to find out the trouble.
Once the hydraulic system is polluted, the cleaning system is difficult, and it will cause the environmental pollution. The pure electric servo bending machine has simple drive system, basically no maintenance cost, and only needs regular lubrication.
The design and manufacture of the pure electric servo bending machine is aimed at high bending precision, high efficiency and high reliability. The finite element analysis of the bed and slider has been carried out to optimize the rigidity of the bed and slider.
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