The Research On NC Machining Method For Flue Gas Trubine Dynamic Blade Surface

Flue gas turbine is the key device in refinery for catalysis and cracking, which is an saving electrical energy equipment by recycling residual energy. Flue gas turbine manufacturing quality relationships to improving the efficiency and reliability of the energy recovery system. Dynamic blade is the main part of the flue gas turbine’s intake system, the precision of the blade surface determines the efficiency of energy recovery and operation quality of the entire energy recovery system. The blade machining accuracy will determine the quality of production of gas turbine.The surface of the flue gas turbine is free-form surfaces. The entire process is completed in one clamping in order to improve the accuracy of blade, which uses the five-axis CNC machining.For the blade surface’s CNC machining, some research which involve the establish of the blade surface model and the manufacture process analysis and tool path planning and the machining simulation of the surface are completed. First studied the model of the blade body surface, and using non-uniform rational B-spline surfaces to establish blade surface. Proposed the calculation of tool path for five-axis CNC machining,and computed the tool path.Study the method of the blade model’s construction. Calculating the normal vector and normal curvature at a point on surface is necessary when programming CNC machining process with CAD/CAM software. Need to correctly analyze and calculate the blade surface differential geometric properties,a reasonable NC program will be completed. Get a better fitting surface model form the design data,that gives the preparation for programming CNC code with CAM system.To get the right tool path analyzes the characteristics of the existing method of tool path planning. Based on the characteristics of the blade,obtain planning parameters of tool path with the Iso-Scallop Method. Studied the tool path planning methods with five-axis CNC machine for the blade, and get the CNC machining tool path and the CNC code.In order to verify the reliability of NC tool path code which come from the tool path planning, virtual machining of the blade surface was completed, verify the correctness of the program, to avoid interference and collision of the cutting tool. Establish a simulation environment with VERICUT CNC machine software, and on this basis to achieve the dynamic simulation of machining the blade surface to verify the correctness of the NC program code and the tool path has been further optimized.