Typical parts machining process planning and automatic programming (Mastercam) Words: 1457 1, Pages: 37 PaperNo:JX07 1 Preface CNC machine tools are the product of comprehensive application of high and new technologies such as computers, automatic control, automatic detection and precision machinery. Its appearance and great benefits have attracted wide attention from the scientific and industrial circles all over the world. The development of CNC machine tools is the only way to measure the technological transformation of a country's machinery manufacturing industry, and it is also the basis of future factory automation. A large number of people and engineers who can master the programming, operation and maintenance of CNC machine tools are needed. However, there are still "six shortages" in our equipment manufacturing industry, that is, "scale, strength, quantity, speed, efficiency, system, originality, single machine, complete sets, export and grade." At present, the conditions for revitalizing China's machinery and equipment manufacturing industry have been met, and the timing is also favorable. With a high sense of mission and responsibility, we should take more effective measures to overcome the difficulties in development and build China from a manufacturing power into one of the world-class manufacturing bases. I chose this topic because this part includes both CNC lathes and CNC milling machines. Used for milling end face, milling boss, drilling through hole, reaming, reaming and tapping thread. We made a general summary of what we have learned. This graduation project is mainly divided into five aspects: 1. Copy and draw part figure 2. Process analysis III. Selection of cutting parameters. Process file 5. Computing and programming. The part drawing is displayed in the form of plane on AUTOCAD, and the structural shape of the part is clearer. Then analyze in detail which shapes the part drawing consists of. CNC machining process analysis, through the process analysis of parts, we can deeply and comprehensively understand the parts, make necessary modifications to the structure and technical requirements of parts in time, and then determine whether the parts are suitable for machining on CNC machines and which CNC machines are suitable for machining. I chose to do this part in the machining center because the machining center has an automatic tool changer, which can finish milling, drilling, boring, reaming, milling and tapping the upper plane of the part in one installation. The parts to be machined can be on the same plane or on different planes. Therefore, parts with both planes and holes are the first choice for machining centers. Then analyze the process or flow that should be completed on a certain machine tool. Need to select positioning datum; On the one hand, the positioning datum of parts should ensure the correctness of the mutual position between the machined surfaces of parts after repeated clamping, on the other hand, it should meet the characteristics of centralized working procedures of machining centers, that is, machining as many surfaces as possible on parts in one installation. The positioning reference is preferably an existing surface or a hole on a surface. Then determine the processing methods and schemes of all processing surfaces; Select tools and cutting parameters. Then, the processing scheme is drawn up, the processing sequence of all steps is determined, and the adjacent steps are divided into one process, that is, the process division is carried out; The processing sequence of face first and then hole, because the plane size profile is large, the plane positioning is relatively stable, and the depth size of the hole is based on the plane, so the plane is processed first and then the hole is processed. Finally, other required processes, such as ordinary machining processes, are inserted and connected to the sequence of NC machining processes to obtain the NC machining process route of the required parts. The cutting parameters are calculated by looking up the table, and then filled in the process file. Finally, programming is divided into manual programming and automatic programming. MASTERCAM software is used for automatic programming here. The whole design is completed. Finally, let's process parts on CNC machine tools to meet the requirements. The wide application of numerical control technology has brought profound changes to the production mode and product structure of traditional manufacturing industry. It also brings new opportunities and challenges to the traditional mechanical and electromechanical majors. Through this graduation project, our graduates can be better familiar with CNC machine tools, determine the processing technology, learn to analyze parts and master CNC programming. Lay a good foundation for coming to work. Directory 1. Copy and draw the part drawing 1 2. Process analysis and machining scheme formulation of parts 1 2. 1 process analysis of parts 1 2.2 positioning datum selection 1 2.3 selecting machine tools 1 2.4 selecting machining methods 1 2. Tightness and positioning 23. Determination of cutting parameters 2 3.65 438+0 Blank outline dimensions 3 3.2 Process 1 Selection of cutting parameters 3 3.3 Process 2 Selection of cutting parameters 5 4. Parts process card 12 4. 1 workpiece installation and zero adjustment card in process 2 12 4.3 process card 12 4.4 tool in process 2. Card 13 5. 1 Master CAM Software Introduction 14 5.2 Master CAM Entity Simulation Machining 14 Summary 28 References 29 Mechanical Graduation Design Data Network (www.lw328.com)