A Rapid Prediction Method of Cutting Force in NC Machining of Vane Type Fluid Machinery

Wed Aug 03 16:41:52 CST 2022

A method for rapidly predicting cutting force in numerically controlled machining of a vane type fluid machine is characterized by comprising the following steps: Step 1: digital modeling of the vane fluid machine flow-through component, by measuring the blank model of the vane fluid machine flow-through component , the measurement points are arranged along the streamline direction of the blade, and the three-dimensional coordinates of the blade surface points are obtained, and then the spatial curves of the blade surface points are obtained, and these curves are fitted to form the three-dimensional digital model of the blade-type fluid machinery flow-through component;

Step 2: The division of the processing area and the selection of the processing tool. First, analyze the surface characteristics of the surface of the vane-type fluid machinery flow-through component. According to the curvature change of the blade surface, it is required to be between the starting point and the ending point in the cutting direction. The curvature change of the machine is not more than 10%, and the curvature change in the transverse direction of cutting is less than 15%, the surface to be processed is divided into several processing areas, and different processing tools are selected for different processing areas;

Step 3: The planning of the processing route, first create the machine tool coordinate system, and set the CNC machining tool movement direction as the tool movement along the parameter line;

                                                                     

Step 4: The generation of the NC machining program, according to the NC programming function of the CAM software machining module, in different machining areas, along the selected machining routes and machining tools to establish and generate NC machining path files;

Step 5: Build the CNC machining simulation environment, use the 3D modeling software to establish the five-axis linkage CNC machine model and fixture model, and convert them into a format that can be recognized by the CNC machining simulation software VERICUT, according to Base→X→Y→Z →C→B→Tool sequence add each component to CNC machining simulation software VERICUT to complete the construction of five-axis linkage machining simulation environment;

Step 6: NC machining geometric simulation, using the geometric simulation function of the NC machining simulation software VERICUT to simulate the NC machining of the flow parts of the vane type fluid machinery, and extract the cutting parameters during the NC machining geometric simulation process, and set the If there is a red area on the machined surface of the part, it means that there is overcut and collision interference during the machining process, then go back to step 4 to carry out the CNC machining path. Regenerate, if the machined surface of the part is all green, it means that there is no overcut and collision interference during the machining process, and the simulation is performed directly to the end of CNC machining;

Step 7: Graphical display of cutting force, the cutting parameters extracted in step 6 are calculated by the cutting force calculation model, and processed by MATLAB software to display the change of cutting force during the cutting process, so as to realize the change of cutting force during the machining process before actual machining. The purpose of making quick predictions.