With the continuous improvement of modern industrial automation level, the demand for precision control components is also increasing. Among many precision hydraulic control components, micro servo valve has attracted wide attention because of its small size, fast response and high precision. It is widely used in aerospace, robotics, medical equipment, intelligent manufacturing and other fields. This paper will discuss the manufacturing technology of micro servo valve.
First, the basic structure and working principle of micro servo valve
Micro servo valve is a high-precision control device that can convert electrical signals into hydraulic output. Its core structure includes electromagnetic driving part, valve core assembly, feedback mechanism and shell. Its working principle is based on electromagnetic induction and hydraulic amplification, and the electromagnetic coil is controlled to generate magnetic force through the input electrical signal, so as to push the valve core to move, adjust the flow and direction of hydraulic oil, and realize accurate control of the actuator.
Second, the key manufacturing technology of micro servo valve
1. Micromachining technology
The manufacture of micro servo valve can not be separated from the support of precision micro-machining technology. Commonly used micromachining methods include lithography, etching and deposition in MEMS technology, which can achieve sub-micron structural accuracy. For example, the fit clearance between the valve core and the valve body is often within a few microns, which puts forward extremely high requirements for material selection and machining accuracy.
2. Material selection and surface treatment
Micro servo valve works in high pressure and high frequency environment, so the material needs to have good wear resistance, corrosion resistance and thermal stability. Commonly used materials include stainless steel, ceramics, titanium alloys, etc., and their wear resistance and magnetic conductivity energy are improved by surface plating (such as gold plating and chromium plating).
3. Assembly and packaging process
The assembly of micro-structures requires extremely high environmental cleanliness and tool accuracy. At present, automatic micro-assembly system combined with visual recognition technology is often used for high-precision assembly. In addition, in order to prevent external pollution and improve reliability, micro servo valves usually adopt air-tight or liquid-tight packaging technology.
4. Testing and calibration technology
After manufacturing, the micro servo valve needs to undergo strict performance tests, including response time, flow control accuracy, repeatability and so on. Advanced test system combined with computer control and sensor technology can complete automatic calibration and error compensation, and ensure the consistency and reliability of products.
Third, the application prospect and development trend
With the development of Industry 4.0, the position of micro servo valve in intelligent control system is becoming more and more important. Future development trends include:
-Higher integration: the function of “intelligent valve” is realized by integrating sensors, control circuits and actuators;
-Lower power consumption: develop new driving modes (such as piezoelectric driving and electrostatic driving) to meet the needs of battery-powered equipment;
-Wider applicability: expand the application ability in extreme environment (such as high temperature, low temperature and radiation environment).
tag
As a key technical product in the field of precision hydraulic control, the manufacture of micro servo valve involves multi-disciplinary cross-integration. With the progress of micro-machining technology and material science, micro-servo valve will develop in the direction of higher precision, smaller volume and stronger adaptability, providing solid technical support for high-end equipment manufacturing.