Abstract
Belt grinding could improve the surface integrity of titanium alloys, but it is difficult to achieve breakthroughs in the grinding mechanism due to the lack of grinding mechanism of titanium alloy microriblets structure. The characteristics of micro-riblets structure are discussed, and the belt grinding method for the micro-riblets is proposed based on the structural features. On this basis, the corresponding relationship model between the belt grinding and the surface parameters of the micro-riblets structure is established. The standard experimental platform was built and the belt grinding experiment was completed. The typical structural characteristics based on the method were obtained. The influence of the belt grinding process parameters on the formation of micro-riblets structures was analyzed. The results show that the micro-riblets structure achieved by the belt grinding method is dominated by sawtooth riblets. The width of the trench (s) is between 2.5μm and 8μm, the average value is 4.91μm, the height of the trench (h) is between 3.5μm and 9μm, the average value is 5.91μm, and the angle of the trench (α) is between 28° and 68°, the average is 42.3°. At the same time, it can be seen that increasing the grinding positive pressure (Fn), the feed step (P), and reducing the grinding feed rate (v <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> ) can increase the sawtooth riblets width (s), the groove height (h), and the trench angle (α) of the micro-riblets structure surface. It can also increase the surface of the micro-riblets structure surface sawtooth riblets b <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> , b <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> . Moreover, the groove ratio h/s and the groove bearing side length ratiob <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> /b <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> have a sinusoidal fluctuation tendency, and the ratio mainly jumps up and down at a fixed value.
Highlights
The formation of micro-riblets structures on the surface of rotating components such as aero-engine blades and blisk has an important influence on improving the service performance such as drag reduction, noise reduction and fatigue resistance
In this paper, the TC17 titanium alloy thin-walled plate is subjected to abrasive belt grinding test, and a standard test platform is built based on micro-ribs structural belt grinding method
The corresponding abrasive belt grinding test was completed by single factor test conditions, and typical 2D and 3D surface structure characteristics based on the method were obtained
Summary
The formation of micro-riblets structures on the surface of rotating components such as aero-engine blades and blisk has an important influence on improving the service performance such as drag reduction, noise reduction and fatigue resistance. In order to control the size of Hm, Bm and form the micro-riblets structure, the technological parameters such as normal pressure Fn of abrasive belt grinding, cutting edge density m of abrasive particle contact area and grinding head feeding speed (vp) can be changed.
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