Overview of interpolation in CNC machining
SUMMARY CNC machining generally rectilinear profile parts, arcs, there are some non-circular curved profile, such as high-order curve, curve list, a list of other surfaces, but can be used to approximate a straight line or arc, when the press slide way When the data of each straight line and circular arc segment is programmed into the NC machining program, and the CNC system is input and started, the CNC system performs input processing, interpolation calculation and output processing, and controls the servo mechanism according to the calculation result. The contours of the machined parts are generally composed of straight lines and arcs. There are also some non-circular curve contours such as high-order curves, list curves, list surfaces, etc., but they can all be approximated by straight lines or arcs. When the data is programmed into the NC machining program and the CNC system is input and started, the CNC system performs input processing, interpolation calculation, and output processing on the block, and controls the servo mechanism according to the calculation result, thereby driving the servo mechanism of the CNC machine tool to make the tool. And the parts are precisely matched to the relative motion of each block, and finally processed to meet the requirements Components.
The interpolation calculation is based on the input basic data, such as the linear end point coordinate value, the arc starting point, the center of the circle, the end point coordinate value, the feed speed, etc., through calculation, the shape of the workpiece contour is described, and the calculation result is calculated according to the calculation result. A feed command is issued to each coordinate. Interpolation is actually the work of data densification based on limited information. Whether it is hardware numerical control or CNC numerical control, the interpolation module is indispensable. The module or device that can complete the