The Application of FGI FD100 low voltage frequency Converter in Die-casting machines
1.Introduction
For the die-casting products industry, electricity consumption is a major component of its production costs, and die-casting machines are one of the main energy-consuming devices in product factories, often referred to as "electricity guzzlers". Therefore, reducing the energy consumption of die-casting machines has become an effective way for the die-casting industry to cut costs and enhance product competitiveness.
2. Industry brief
At present, the majority of die-casting machines are hydraulic transmission die-casting machines. The power in the hydraulic transmission system is provided by the motor driving the oil pump. During the process of the die-casting cycle, the requirements for flow and pressure vary in different processes. Therefore, flow valves and pressure valves must be used to adjust the different flow and pressure needed for different processes. Moreover, when the load changes significantly, since the constant-flow pump cannot adjust the output power, the excess energy can only be consumed in the baffles, oil leakage, and temperature rise of the oil. This also accelerates the wear of various valves, causes excessive oil temperature, excessive motor noise, and shortens the mechanical lifespan. Moreover, usually the capacity of the motor designed is much higher than the actual requirement, resulting in the phenomenon of "a large horse pulling a small cart", causing a large amount of energy waste. Therefore, promoting the application of frequency converters in die-casting machines is of great significance for reducing energy waste.
3. Description of the process
The oil pressure required for the mold closing and demolding of the die-casting machine and the mold opening system is relatively low, and the time is short. The oil pressure required for injection, pressure holding and cooling systems is relatively high and takes a long time, generally 40% to 60% of one working cycle. The duration of each stage is related to the processing of the workpiece. The length of the intermittent period is also related to the condition of the workpiece being processed. Sometimes, the intermittent period may not be necessary. If the injection screw is driven by a hydraulic motor, the system oil pressure during injection will be higher. The weight of workpieces processed by die-casting machines ranges from tens of grams to tens of thousands of grams.
can be classified into small, medium and large ones. The time required for processing small workpieces weighing tens of grams and large ones weighing several kilograms in one cycle is also different. Even for the same die-casting machine, the pressure and time required in each process flow need to be changed if the raw materials of the workpieces processed are different.
4.System advantages
After the transformation, the FD100 low-voltage frequency converter automatically adjusts the speed of the motor according to the required pressure and flow rate of the die-casting machine, achieving a significant energy-saving effect, improving the power factor of the power grid and reducing reactive power loss.
Soft start reduces the impact on the power grid, extends the service life of power supply equipment, and at the same time increases the capacity of transformers, alleviating the pressure of capacity increase.
Due to the reduction in motor speed, the wear of the oil pump is also decreased, the noise is reduced, the maintenance cost is lowered, and the service life is prolonged.
The following are the on-site case pictures of using the FD100 low-voltage frequency converter in a company in Chongqing:
