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In modern die casting production, as a key equipment, the performance of die casting machine directly affects the quality of castings, production efficiency and the stability of equipment. As the core control element in the hydraulic system of the die casting machine, the servo valve is responsible for accurately controlling the flow and pressure of hydraulic oil, so as to realize the accurate control of each action in the die casting process. Therefore, it is very important to master the correct adjustment method of servo valve to ensure the normal operation of die-casting equipment.<\/p>\n
First, the basic function of servo valve<\/p>\n
Servo valve is a kind of high-precision hydraulic control element, whose main function is to adjust the flow and pressure of hydraulic system in proportion according to the size of control signal. In die casting machine, servo valve is widely used to control the speed and strength of key mechanisms such as injection, clamping and ejection, and its adjustment accuracy directly affects the molding quality of products.<\/p>\n
Second, the purpose of servo valve adjustment<\/p>\n
The main purpose of adjusting the servo valve is to ensure the rapid response, smooth action and accurate control of the system. By adjusting the servo valve, the speed control, pressure switching, action synchronization and other links in the die casting process can be optimized, thus improving the surface smoothness, dimensional accuracy and production efficiency of die casting parts.<\/p>\n
Three, the preparation before the servo valve adjustment<\/p>\n
Before adjusting the servo valve, the following preparations should be made:<\/p>\n
1. Confirm that the system is in good condition, including whether the hydraulic oil level, temperature and cleanliness meet the requirements and whether the pump station pressure is stable.<\/p>\n
2. Check the electrical control system: ensure that the signal input of PLC or control system is normal and the feedback devices (such as displacement sensors and pressure transmitters) work reliably.<\/p>\n
3. Prepare tools and instruments: such as multimeter, pressure gauge, oscilloscope, etc., so as to facilitate data collection during detection and adjustment.<\/p>\n
Four, the servo valve adjustment steps<\/p>\n
1. Zero calibration<\/p>\n
Firstly, adjust the zero offset of the servo valve to ensure that the valve is closed when the control signal is zero. By adjusting the zero adjustment knob of servo amplifier, the actuator (such as oil cylinder) can output without displacement when there is no signal.<\/p>\n
2. Gain adjustment<\/p>\n
The gain determines the response sensitivity of the servo valve to external signals. Too high gain may lead to system oscillation, and too low gain will lead to slow response. When adjusting, the gain should be gradually increased to observe whether the movement of the actuator is stable and jitter-free.<\/p>\n
3. Dead zone compensation<\/p>\n
There is a certain dead zone in the servo valve (that is, when the control signal is small, the spool has no action), so it is necessary to improve the control accuracy through dead zone compensation. Appropriate dead-time compensation value can be set in the control system, so that small signals can also drive the spool to act.<\/p>\n
4. Dynamic response test<\/p>\n
Dynamic test is carried out in the actual die casting cycle to check whether the switching of each action is smooth and the response is timely, and fine-tune the parameters to optimize the performance if necessary.<\/p>\n
5. Pressure\/flow curve matching<\/p>\n
According to the process requirements, the pressure-flow curve of servo valve is matched to match the action characteristics of die casting machine, so as to achieve the purpose of energy saving and high efficiency.<\/p>\n
Five, common problems and solutions<\/p>\n
1. Slow system response: The gain setting may be too low or the hydraulic system pressure is insufficient, so it is necessary to adjust the gain or check the pumping station.<\/p>\n
2. Action jitter or vibration: It may be due to too high gain or unstable feedback signal, so the gain should be reduced appropriately or the sensor should be checked.<\/p>\n
3. The action is not synchronous: it may be that the parameters of multiple servo valves are inconsistent and need to be calibrated one by one to ensure synchronization.<\/p>\n
VI. Maintenance and monitoring after adjustment<\/p>\n
After the adjustment is completed, the state of the servo valve should be monitored regularly to keep the hydraulic oil clean, and the filter element should be cleaned regularly to avoid impurities blocking the servo valve. At the same time, the calibration record of servo valve should be established to facilitate later maintenance and troubleshooting.<\/p>\n
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Conclusion:<\/p>\n
The adjustment of servo valve is a highly technical job, which requires the operator to have certain knowledge and practical experience of hydraulic system. Only through scientific and systematic adjustment can we give full play to the role of servo valve in die casting machine and improve the quality of die casting products and the stability of equipment operation. Enterprises should strengthen the training of servo valve adjustment and maintenance, improve the level of equipment management, and ensure the high efficiency and safety of die casting production.<\/p>\n","protected":false},"excerpt":{"rendered":"
\ufeffIn modern die casting production, as a key equipment, the performance of die casting machine directly affects the quality of castings, production efficiency and the stability of equipment. As the core control element in the hydraulic system of the die casting machine, the servo valve is responsible for accurately controlling the flow and pressure of […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-413","post","type-post","status-publish","format-standard","hentry","category-industrial-automation"],"_links":{"self":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts\/413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=413"}],"version-history":[{"count":1,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts\/413\/revisions"}],"predecessor-version":[{"id":698,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=\/wp\/v2\/posts\/413\/revisions\/698"}],"wp:attachment":[{"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=413"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.servovalvess.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}