Discrete Vector Model 2 Blank Modeling and Data Structure For NC machining simulation, there are three basic geometries: blank body, part body, and knife specific. The process of simulation is to move the knife along the path of the tool position, and continuously calculate the Boolean difference between it and the blank body, so as to simulate the cutting process. As the blank body is continuously cut, the blank body is continuously approaching the part body, eventually achieving the goal of machining simulation.
During the processing of the machining simulation program, the simulation of the NC machining can be completed by processing the corresponding z-map points. The hole blank model and its data structure. The mathematical representation of the hole blank can refer to the representation of the non-porous blank model. First, the blank is projected discretely on the oxy plane, and then a two-dimensional array of rows and columns is used to represent the discrete grid points of the blank in the x and y axes. The difference is that the elements of the two-dimensional array are not completely stored by the oxy plane. The z-map value corresponding to the discrete grid points. In the process of simulation, it is first necessary to judge whether there are holes at each discrete point. If there is no hole, the corresponding elements of the two-dimensional array directly store the z-map value; if there is a hole, it is necessary to establish a linked list in real time, and Store the first address of the linked list into a two-dimensional array. After adding a breakpoint in the z-axis direction of the discrete point, add a linked list element, and add a two-dimensional array subscript of the hole blank model and the corresponding discrete points. The tail of the linked list is sorted by the size of the z-map value, and the member pointer of the next element of the linked list is assigned a value of NULL (indicated as empty), indicating that the linked list ends.
Algorithm and Implementation of Simulation Processing Material Removal 311 Material Removal Algorithm Processing simulation with discrete model is the process of intersection between the center of the tool and the discrete points. Material removal can be achieved by dynamically modifying the z-map value. The NC program drives the various axes of the machine, each of which drives the workpiece or drives the tool. In each step of the NC program driving each axis, the coordinates of the tool center point and the x, y coordinate range of the workpiece and the z-map value of each point are recorded, and then the (x, y) coordinates of the tool are compared in the workpiece x. In the y coordinate range, if not, read the next CNC driver; if it is, compare the z coordinate value of the tool with the z-map value of the workpiece, if there is an intersection, modify the z-map value in real time, if not At the intersection, the next CNC driver is read and looped until the NC program ends.
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