An optimization study of polishing efficiency of blisk and its technological parameters

Abstract

When applied to blisk blade profile polishing of aero-engines, “five-axis NC + flexible grinding head + elastic grindstone” polishing technological equipment has advantages of high precision, minor interference, favorable adaptivity, etc. In order to improve the polishing quality and polishing efficiency, a mathematical calculation formula of polishing efficiency was established according to the polishing principles of elastic grindstone (sanding wheel). The optimized combination of technological parameters ( ω = 6000 r/min, ap = 0.9 mm, vf = 320 mm/min) was obtained through the range method of orthogonal test results with double optimization objectives—surface roughness and polishing efficiency. Based on the relationship between number of polishing times and surface roughness, a technological program was put forward, that is, polishing is firstly conducted using 320# sanding wheel for 6 times and then 400# sanding wheel for 9 times (totally 15 times) under the optimized combination of technological parameters, then surface roughness less 0.4 μm can be achieved. Blade polishing test results indicate that: efficiency-optimized technological parameters can not only significantly shorten polishing time but also acquire qualified blade surface roughness less 0.4 μm, thus verifying reliability of the optimization method and results.

On the path planning method of polishing tool based on the abrasive belt flap wheel

“…Furthermore, when the rotation speed exceeds 10000 r/min, the change in the radius of the ABFW reaches zero because the wheel reaches its maximum elastic deformation. Zhang [26] and Huai [27] also discovered this phenomenon and explained it, reaching the same conclusion. Additionally, a titanium alloy cylindrical polishing experiment is conducted to measure the Preston coefficient K and obtained K=4.975×10 -6 , the clamping method is shown in Fig.…”