New Type Of Open Belt Grinding Technology And The Application In Aero-engine Blade Machining

As one of the key parts of the aero engine, the blade has a very important influence on the performance of the aero-engine. The thickness has great mutation at root and damping table R of blade, stress concentration phenomenon is very serious, so in the process of high load operation of blades, it is prone to fracture in the stress concentration, resulting in discarding of blades, and impact on the safety and the service life of the aviation engine seriously. At present, manual grinding is widely used to process the R of the blade root and damping stage, but the grinding efficiency is low, defective rate is high, and it is easy to forme scratches in excessive angle R, which increasing stress concentration. The CNC Abrasive Belt Grinding Technology has been applicated in traditional blade surface and edge processing. However, due to the small curvature radius of the blade root and damping stage of R, making traditional abrasive belt grinding technology and device is difficult to process root and damping table R effectively. In order to realize the automatic processing of root and damping table R of blade, this topic proposed a new type abrasive belt grinding technology, designed a set of polishing tool system, and the grinding process was carried out to provide guidance for realizing the process of root and damping table R of blade.Based on the analysis of theory of new type abrasive belt grinding technology, studied the dynamic characteristics of the new type abrasive belt grinding system, and established the mathematical model of winding system based on principle of Archimedes spiral;Based on the above theoretical analysis, according to the processing technical requirements of the root and damping table R of blade, the analysis and design of the key components, such as grinding and polishing mechanism, driving mechanism, tensioning mechanism, pressure control mechanism etc has been carried out, and a new type of abrasive belt grinding and polishing tool system was developed;In the light of the grinding and polishing tool system developed above, the finite element analysis was performed on the static and vibration characteristics, inorder to verify its strength, static stiffness and dynamic characteristics;On the basis of the above research, through orthogonal experiment, probed into the influence law of the abrasive belt grinding parameters on the surface roughness and grinding depth of titanium alloy material. The grinding parameters were optimized by grey correlation. The feasibility and effectiveness of the R is verified by using the optimized grinding parameters to process experiment of the blade root and damping stage.