Abstract
Currently, how to release the heat accumulated in the molten pool rapidly is the key factor in blade repair. We analyzed the problem of the current cooling method in blade additive manufacturing repair. Based on cooling effect, we proposed an advanced flexible multiflow path fixture cooling method for blade additive manufacturing repair. We created a coupled heat transfer model and deduced the heat transfer law for multiflow path conjugate flexible clamping. We obtained the optimal cooling scheme for flexible multiflow paths through numerical analysis. We built an experimental platform and tested the cooling effect of the fixture prototype by experiment. The results show that compared with the current cooling method, the new cooling method not only can lower the initial temperature of the fixture rapidly and realize the steady-state heat transfer between the fixture and the flow path quickly but can also significantly enhance the ability of fluid to participate in heat transfer in new flow paths, which significantly improves the cooling effect. The research results are of great significance for the improvement of aero blade additive manufacturing repair.
Highlights
In additive manufacturing repair of aviation compressor blades, the heat accumulation in the molten pool usually reduces the repair quality of the blades
DESIGN OF A FLEXIBLE MULTIFLOW PATH FIXTURE Since the original fixture base is closely related to the coordinate positioning and control of the Micro plasma arc welding (MPAW) system, the copper bond design scheme of the flexible multiflow path fixture keeps the original length of 43 mm unchanged
The total width of all of the copper bonds is consistent with the original fixture copper bonds, such that the original copper bonds can be replaced, and new copper bonds can be directly loaded on the original fixture base
Summary
In additive manufacturing repair of aviation compressor blades, the heat accumulation in the molten pool usually reduces the repair quality of the blades. The heat conduction process of the copper bond under the fixture base cooling method with a single flow path. The integrated design of the flow path and the copper bond greatly reduces the distance between the cooling fluid and the main heat dissipation clamping surface under this solution, thereby achieving better heat dissipation. In order to reduce the number of grids and calculation, the base and the cover plate are removed, and the copper bonds and test pieces are taken as the research objects to establish a simplified heat transfer model. Considering the structural difference between the actual structure of the copper bond and the heat exchange tube, the flow rate range of 2∼5 L/min is the optimal flow rate range of the flexible flow channel
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