Pre-processing: The process of generating the tool path by the NC automatic programming system is pre-processing. After completing the geometric modeling of the part, the interactive graphical automatic programming system completes the tool path generation. The basic process is: first determine the type of processing (contour, point, groove or surface machining), use the cursor to select the machining location, select the route or cutting method. Previous page next page
Then select or input the tool type, tool number, tool diameter, tool compensation number, machining allowance, feed rate, spindle speed, retracting safety height, rough finishing times and margin, tool radius length compensation status, advance and retraction Extend all process cutting parameters required for machining such as line values. Finally, the software system generates, according to the geometric model data and cutting process data of these parts, the tool movement track data, ie the tool position file CLF (CutLocationFile), and dynamically displays the machining path of the tool movement.
Post processing: The purpose of post processing is to generate a CNC machining program for a particular CNC system. Since the numerical control systems used in various machine tools are different, such as FANUC, SIEMENS, AB, GE, etc., the codes and formats specified by each CNC system are different. For this reason, automatic programming software systems usually provide a variety of Dedicated or generic post-processing files that convert the generated location file into a suitable CNC machining program. The early post-processing files are not open and cannot be modified by the user. Most of the current excellent CAD/CAM software provides open, general-purpose post-processing files. The user can open the file according to his own needs and modify the relevant content in the file according to the format of the NC machining program desired to be output. This universal post-processing file can meet the requirements of various CNC systems with a little modification.
Manual programming: All the work of manually programming (including computer-aided numerical calculations) is called manual programming.
For point machining or parts with simple geometry, the numerical calculation is simple, the program segment is not much, and it is economical to use manual programming. For more complex parts, manual programming is also very convenient if it can be programmed with the fixed cycle (composite fixed cycle) command specified by the CNC system. Manual programming is cumbersome, time consuming, and error prone for spatially curved parts, or when the part outline is simple but the program size is large. In order to shorten the programming time and improve the utilization of the machine tool, the "automatic programming" method must be adopted.
Automatic programming: computer-aided programming, which is assisted by a computer to generate a part processing program by means of a numerical control automatic programming system. At this point, the programmer generally only needs to use the various functions provided by the numerical control programming system to describe the processing object, the process parameters and the processing process, and then the rest of the NC machining program can be automatically completed by the programming system. Automated programming reduces the labor of the compiler, shortens programming time, and improves programming quality. At the same time, it solves the programming problems of many complicated parts that cannot be solved by manual programming. Usually the part machining program above the three-axis linkage can only be done by automatic programming (such as the calculation of non-circular curve contours).
Tool point (start point): The point at which the tool is positioned relative to the workpiece. The tool point can be a point on the workpiece or fixture, or a point that is easy to measure with them. After the workpiece is mounted on the machine, the relative position of the tool and the tool can be determined by using the "tool setting" method at this point, or the relative relationship between the machine coordinate system and the workpiece coordinate system is determined.
Tool location: A specific point on the tool that determines the position of the tool in the machine coordinate system. This operation is a necessary step before the workpiece is processed. That is, the manual method is adopted before the machining, and the tool or the workpiece is moved, and the tool position of the tool coincides with the co-built tool point.