Machining Center Method

In CNC machining centers, there are usually two kinds of programming methods today: ①Simple contours—the contours composed of straight lines and arcs are directly programmed with the G code of the CNC system. ②Complex contours—three-dimensional surface contours, draw three-dimensional graphics in the computer with automatic programming software (CAD / CAM), set various corresponding parameters according to the surface type, and automatically generate CNC machining programs. The above two programming methods can basically meet the requirements of CNC machining. However, it is very difficult to process the contour of the function equation curve, because the early milling machine CNC system does not have the function operation function, and the processing program of the function equation curve cannot be compiled directly with the G code, and the (lower version) CAD / CAM software is usually not It has the function of inputting graphics directly from equations. Therefore, the cutting function equation curve contour is usually used: calculate the coordinates of each point on the curve according to the requirements of the drawing, and then use the straight line or arc command code to compile the program according to the calculated coordinate value, and manually enter the system for processing.

The machining center is a high-efficiency, high-precision CNC machine tool. The workpiece can be processed in multiple procedures in a single clamping. It also has a tool library and automatic tool change. The rich functions of the machining center determine the complexity of machining center programming.

The machining center can realize the linkage control of three or more axes to ensure that the tool can process complex surfaces. In addition to the linear interpolation and circular interpolation functions, the machining center also has various machining fixed cycles, automatic tool radius compensation, automatic tool length compensation, graphical display of the machining process, man-machine dialogue, automatic fault diagnosis, offline programming and other functions .

The machining center is developed from a CNC milling machine. The biggest difference from the CNC milling machine is that the machining center has the ability to automatically exchange machining tools. By installing tools with different uses on the tool magazine, the machining tools on the spindle can be changed by an automatic tool changer in one clamping to achieve a variety of machining Features.

The machining center can be divided into vertical, horizontal and composite machining centers in appearance. The main axis of the vertical machining center is perpendicular to the worktable, which is mainly suitable for processing plate and shell workpieces, and can also be used for mold processing. The spindle axis of the horizontal machining center is parallel to the table surface of the worktable. Most of its worktables are CNC rotary tables controlled by servo motors. In a single clamping of the workpiece, the worktable can be processed by rotating the worktable. Box type workpiece processing. The compound machining center mainly refers to that there are two vertical and horizontal spindles on one machining center, or the spindle can change the angle by 90 °, so that the machining of five faces can be achieved in one clamping of the workpiece.