How skilled do you have to be today to be called the first person to grind ultra-fine steel needles in the field of special tooling for aircraft engines?
Unique skill, he is called the first person to grind ultra-fine steel needles! View more reposts, 0.001 mm "hand grinding" unique skill, he is called the first person to grind ultra-fine steel needles! World Advanced Manufacturing Technology Forum has been followed to share like watching has been synchronized to watch and write your comments video details After grinding 6 steel needles at the same time, the accuracy is 0.001 mm
National Model Worker Xia Fushan is a special-grade fitter technician of China Aero Engine Corporation. Steel needles and grinding paste are his "weapons" and the three-foot fitter table is his "battlefield"
He can grind 6 steel needles on the grinding plate at the same time in a straight line, just grinding off 0.0003 mm. Xia Fushan said: "I know every time I grind off the micron-level margin"
30 back and forth, the strength of both hands cannot have the slightest deviation, otherwise the 6 steel needles will be completely useless. After 30 seconds, 6 steel needles with the same size and accuracy are ground. Their accuracy is 0.001 mm. These steel needles have a special name, plug gauges, which detect the size of the hole by insertion. This is the ultimate inspection tool for the air film hole of the aircraft engine blade
Aeroengine in When working, thousands of blades are subjected to huge thermal loads, aerodynamic loads and centrifugal loads in a high temperature, high pressure and high speed environment. The dense air film holes on the blades form a cooling air film on the blade surface, which effectively isolates the high-temperature combustion gas. Once the precision of the steel needle exceeds 0.001 mm, the deviation will affect the size of the air film hole. The cold air coming out of the air film hole will cover unevenly, resulting in uneven surface temperature distribution. If the local stress is too large, the blade will be at risk of breaking, which may be fatal to the engine and the aircraft. 0.001 mm is the standard to ensure the stable performance of my country's domestic aircraft engines. It is a precision that mechanical grinding has not been able to achieve so far, and it is a precision that only a few aviation powers can achieve. At the age of 24, he solved the difficulties in the development of the "Taihang" engine. my country's first large-thrust turbofan engine During the development of the "Taihang" engine, the difficulty of detecting the accuracy of air film holes was a "stumbling block" in the development process, and high-precision plug gauges were the key to detecting the accuracy of air film holes. The difficulty of developing plug gauges was placed in front of Xia Fushan, who was 24 years old at the time. Xia Fushan recalled: "When I received this task, I had no experience to learn from. I adopted many benchwork processing methods and tried nearly a hundred steel needles..." After repeated experiments and hundreds of trial and error, Xia Fushan found the simplest and lowest-cost method of grinding plug gauges, and finally locked the accuracy at 0.001 mm, which helped the development of the "Taihang" engine. He also grew into the first person to manually grind extremely fine steel needles in the field of special tooling for aviation engines. Today, the "Taihang" engine has become the core power of domestic fighter jets, and Xia Fushan's steel needles are still being iterated. "We have the ability and confidence to equip fighter jets with more powerful ones. "The 'Chinese Heart'" With the upgrading of fighter jets and aero-engines, the air film holes on the blades are getting smaller and denser. There are hundreds of air film holes on a blade, and the requirements for the accuracy of the plug gauges are getting higher and higher. In the workshop, Xia Fushan often "talks" with metal. He said: "The best tool is the feel." He puts block gauges of different sizes in his hands and feels the subtle differences between them. Just by feel, Xia Fushan can distinguish two block gauges with a thickness difference of only 0.01 mm. Through words and deeds, Xia Fushan also passes on his craftsmanship and ingenuity to more young people. His apprentices have also become front-line backbones. "With the improvement of my country's engine manufacturing technology, maybe one day this steel needle will not be needed. We will face new, more difficult and more severe challenges. My team and I have the ability and confidence to complete the challenge and equip Chinese fighter jets with a stronger and more powerful 'Chinese Heart'"
