CNC machining process The CNC machining process in this system includes: CNC machining process analysis, reasonable selection of machine tools, process division, workpiece part clamping, machining allowance selection, cutting amount determination, tool setting and tool change point Determination, determination of the processing route.
Since the CNC machine tool is processed strictly according to the machining program, the movement process of the machine tool, the process of the part, the shape of the tool, the amount of cutting and the route of the cutter are programmed, which requires the programmer to have a rich machine. Processing knowledge, a comprehensive understanding of the performance, characteristics and applications of CNC machine tools, cutting range, standard tools, etc., otherwise it is difficult to determine the processing procedures of parts correctly and reasonably.
The main purpose of the test questions is to enable students to practice after learning the software and hardware aspects of CNC technology, to understand their own deficiencies and to deepen their learning impressions. The questions are mainly for selection and fill-in-the-blank questions, because the Authorware software provides rich interactive response capabilities, such as: button response, tap region response, tap object response, movable object response, drop-down menu response, button response, input text. Responses, conditional responses, attempted limit responses, time-limited responses, etc., make it possible to develop a wide variety of choices and fill-in-the-blank questions. If the question asks the student to choose between several answers (except one, the others have a few errors), and finally use the Authorware's tap object response or tap the area response to judge whether the answer given by the answerer is correct. .
Manual programming, manual programming, analysis of drawings, determination of process, numerical calculation, writing of machining programs, etc. are all done manually, suitable for processing parts with simple shapes. After completing the process analysis and determining the path of the pass, numerical calculation becomes the key in programming. The main points of the numerical calculation are: the calculation of the base point and the node (the calculation of the base point when the contour of the part is composed of a straight line and an arc, the calculation of the non-circular curve, the coordinates of the node of the list curve, etc.); the calculation of the tool path trajectory (tool Numerical calculation of central programming, numerical calculation of sharp angle transition, offset calculation when using imaginary tool tip on CNC lathe, etc.; auxiliary calculation (incremental calculation, numerical calculation of auxiliary block, etc.); numerical calculation of simple curved parts .
With the popularity of computer applications, it is very effective to use computer-aided calculation of coordinate data. At present, manual programming (auxiliary programming) is still widely used. The automatic programming programmer writes the source program in the numerical control language according to the requirements of the pattern or inputs the contour map of the processed part in the programming system, and the computer automatically performs numerical calculation and post processing to write a part processing program. APT, FAPT, etc. are used in a wide range of numerical control languages.
At present, the main use of graphic CNC automatic programming system, such as Master-CAM, UGII, GNC, etc., the programming flow is as shown. The advent of automatic programming makes some programs that are cumbersome to calculate, difficult to program manually, or impossible to program, so the prospect of automatic programming is very ambitious.
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