With the continuous development of modern industrial manufacturing technology, laser cutting, as a high-precision and high-efficiency processing method, has been widely used in aerospace, automobile manufacturing and precision machinery and other fields. In these high-precision application scenarios, the servo valve is a key component in the hydraulic control system, and its installation position and cutting accuracy are directly related to the stability and response speed of the system. Therefore, how to realize the precise positioning of servo valve by laser cutting has become an important topic in the current manufacturing process.
First, the principle and advantages of laser cutting
Laser cutting is to use high energy density laser beam to irradiate the surface of material, make it melt or vaporize quickly, and blow off the slag by auxiliary gas, thus completing the cutting process. It has the advantages of high cutting precision (up to micron level), small heat affected zone, fast cutting speed, non-contact processing and so on, and is especially suitable for processing complex shapes and precision parts.
In the processing of precision hydraulic components such as servo valves, traditional machining methods have problems such as tool wear and precision decline, while laser cutting can effectively avoid these problems and provide technical support for achieving high-precision positioning.
Second, the structural characteristics and positioning requirements of the servo valve
Servo valve is a kind of high-precision hydraulic control valve, which is usually composed of valve body, valve core and electromagnetic drive part, and is widely used in automation systems that require high control accuracy. The machining accuracy of its installation hole position, positioning groove and interface directly affects its working performance.
In the actual machining process, the positioning requirements of servo valves are extremely strict, and the accuracy of ±0.01mm or even higher is usually required. In addition, because the servo valve is mostly made of metal (such as stainless steel, aluminum alloy, etc.), the traditional mechanical drilling or milling method is easy to cause burr and deformation, which affects the assembly quality.
Third, the key technology of laser cutting for servo valve positioning.
1. High-precision positioning system
Laser cutting equipment is usually equipped with high-performance servo motor and high-precision guide rail, combined with CCD visual positioning system, which can realize accurate positioning and identification of the workpiece and ensure that the cutting path is completely consistent with the design drawings.
2. 3D modeling and programming technology
Through CAD/CAM software, the servo valve parts are modeled in three dimensions, and the cutting path program is generated to ensure that the cutting position of each positioning hole and slot is accurate.
3. Auto focus and power control
The laser cutting machine has automatic focusing function, which can adjust the focus position in real time according to the material thickness, and at the same time, by accurately controlling the laser output power, the cutting quality is stable, and the phenomenon of over-burning or incomplete cutting is avoided.
4. Fixture and clamping process optimization
In order to avoid the displacement of the workpiece during machining, a special fixture is used for positioning and clamping, supplemented by pneumatic or vacuum adsorption devices, to ensure that the workpiece remains stable during the whole cutting process.
Fourth, practical application cases
In a hydraulic component manufacturing enterprise, 200W fiber laser cutting machine was used to cut the positioning hole of the servo valve body. After importing three-dimensional drawings and using the visual positioning system to calibrate, the precision of the cut positioning hole reaches ±0.005mm, and the surface is smooth and burr-free, which fully meets the assembly requirements. At the same time, the production efficiency is improved by more than 30% compared with the traditional processing method.
V. Conclusion
To sum up, laser cutting has become an ideal choice for precise positioning of servo valves because of its advantages of high precision, non-contact and high degree of automation. In the future, with the development of intelligent manufacturing and Industry 4.0, laser cutting technology will play a more important role in the manufacture of servo valves and other precision components. Enterprises should constantly optimize the laser processing technology and improve the level of automation to meet the growing demand for high-precision manufacturing.