A New Breakthrough Achieved in Precision Machining of Alloy Steel Valve Bodies, Facilitating the Upgrading of the High-end Equipment Industry

Recently, a precision machining case of a alloy steel valve body completed by Dongfang Jinggong, a leading enterprise in China's high-end equipment manufacturing industry, has attracted attention in the international industrial field. The enterprise customized the core components of the supercritical valves for a nuclear power plant for a certain energy giant in Europe. With a tolerance control of 0.005 millimeters and a nanoscale surface finish, it successfully passed the TÜV Rheinland certification, marking another breakthrough in China's precision machining technology. The valve body in this case is made of X20CrMoV12-1 alloy steel and needs to withstand extreme working conditions of a high temperature of 600℃ and a high pressure of 35MPa. The technical team overcame the problem of deformation caused by uneven material hardness by combining a five-axis linkage CNC machine tool with an adaptive vibration suppression algorithm. Project engineer Li Ming introduced, "We adopted a layered milling strategy in the rough machining stage, and when it came to the finish machining, we enabled the laser on-line measurement and compensation technology to ensure that the flatness error of the sealing surface of each valve body does not exceed 2 micrometers." The entire machining process includes 12 quality inspection checkpoints, including ultrasonic flaw detection, spectral composition review, and helium mass spectrometer leak detection tests. The specially designed low-temperature cooling system reduces the heat-affected zone by 60%, significantly improving the phase stability of the material. The customer acceptance report shows that the service life of this batch of valve bodies is increased by 40% compared with the industry average standard, and the delivery cycle is shortened by 35%. "The precision machining case of the alloy steel valve body by Dongfang Jinggong allows us to see the innovative strength of China's high-end manufacturing," the customer's technical director commented at the acceptance meeting. It is reported that the two sides have reached a new cooperation on the development of key components of hydrogen energy storage and transportation equipment. It is expected to adopt a composite process of 3D printing and precision machining to further break through the manufacturing limits of complex structural parts. The success of this case not only confirms the effectiveness of the collaborative innovation model of industry, university and research, but also provides a demonstration sample for China's high-end valves to break the foreign technological monopoly. With the in-depth application of Industry 4.0 technology, the "Chinese precision" in the field of precision machining is occupying a more important position in the global industrial chain.