February 16,2022.
01. Brief introduction of die casting industry At present, the vast majority of die casting machines belong to hydraulic transmission die casting machines, the power of hydraulic transmission system is provided by the motor driven oil pump. In the process of die casting cycle changes, die casting machine in different processes need different flow and pressure, must rely on flow valve and pressure valve to adjust the different flow and pressure required by different processes. And when the load change is relatively large, because the output power of the quantitative pump can not be adjusted, so the excess energy can only be consumed in the baffle, oil leakage, oil temperature rise, which also aggravates the wear of various valves, and causes high oil temperature, excessive noise of the motor, and shortened mechanical life and other phenomena. And usually in the design of the capacity of the motor is much higher than the actual need, there is a "big horse car" phenomenon, resulting in a lot of waste of electric energy. Therefore, it is of great significance to promote the application of frequency converter in die casting machine to reduce energy waste. 02, die casting machine hydraulic system principle overview 1. Overview of working principle of die casting machine Hydraulic injection machine is a kind of typical equipment periodic duty, in a complete working cycle (processes) can be roughly divided into clamping, for soup, and shoot, core-pulling, open mode, thimble, cooling, accumulator and so on several stages, each stage is through the oil pump motor pump out of the hydraulic oil into each cylinder drive transmission mechanism through a series of actions, Each stage requires different pressures and flows. For hydraulic system, each stage requirements for pressure, flow rate of each different, and the oil pump motor power is based on the maximum load allocation in the process of operation, and the die casting machine of a work cycle, only high pressure clamping and then shoot stage work load is bigger, the other work stage generally small, during the process of cooling load is almost zero. For oil pump motor, the process of die casting machine is driven by changes in the load state, quantitative pump in hydraulic system, the oil pump motor at a constant speed to provide a constant flow, and the working pressure and flow required size is depends on the pressure proportional valve and flow proportional valve to regulate, by adjusting the pressure or flow proportional valve opening to control pressure or flow rate. The excess hydraulic oil flows back through the relief valve. This process is called high pressure closure, and the energy loss caused by it is generally around 50%. 2. Overview of energy saving reform principle of die casting machine According to the working principle ...
Read More