Abstract
Shrouded blisks play a vital role in aero and rocket engines. Multi-axis EDM is regarded as the most commonly used manufacturing method for shrouded blisks. For a linear jump path, the jump motion only needs to consider the starting and end point of the jump and there is no direction change during the jump. However, when dealing with multi-axis jump motions, the path of a jump motion is a curve which is represented by a number of line segments. For this case, the jump speed of an electrode will change abruptly in terms of direction and magnitude during the jump motion. In this paper, multi-axis corner rounding solution (MCRS) is proposed to smooth multi-axis jump paths. Two three-dimensional subspaces, a linear subspace and a rotary subspace, are built to describe six-axis jump paths for a six-axis EDM machine tool. A three-axis jump path smoothing solution can be applied for the subpath in each subspace. By using a bidirectional scanning method as well as an S-shaped profile, the smoothness of the multi-axis feedrate schedule is obtained. Simulation results show that the MCRS achieves a smoother scheduled feedrate profile as well as a higher efficiency. Experimental results show that the machining time can be decreased by 19.68% with the use of the MCRS.
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Funding
This research is financially supported by the National Natural Science Foundation of China (Grant No. 51675340), Shenzhen Basic Research Program (Grant No. JCYJ20170811160440239), National Science and Technology Major Project(Grant No. 2014ZX04001061), and China Postdoctoral Science Foundation (Grant No. 2017M621460).
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Liu, HD., Xi, XC., Chen, M. et al. A look-ahead transition algorithm and jump motion planning in multi-axis EDM for shrouded blisks. Int J Adv Manuf Technol 98, 947–958 (2018). https://doi.org/10.1007/s00170-018-2286-1
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DOI: https://doi.org/10.1007/s00170-018-2286-1