Application of Master CAM Software in NC Training

(Department of Mechanical Engineering, Changzhou Technical Teachers College, Changzhou, Jiangsu 213001, China), which lays the foundation for students to master modern advanced manufacturing technology.

With the rapid development of modern industry, CNC machine tools have become the main force of the manufacturing industry. The application of CNC machine tools has become more and more popular. The advanced manufacturing technology is developing at a high level of design, manufacturing and management, and the requirements of the society for CNC technology talents. It is getting higher and higher. The author combines teaching, taking MasterCAM software as the core, with the simulation mode of numerical control simulation software and numerical control machine tool, and expounds the numerical control skill training.

1 CNC equipment environment for CNC training equipment consists of 80 computers, networks, several CNC lathes and machining centers. Configure the corresponding CNC machine tool simulation software (homemade) and MasterCAM software on the computer. The computer is connected to the computer and the numerical control device by a network cable to form a small local area network (as shown). Transfer the CNC machining program to the CNC machine through the RS232 interface.

Because the price of CNC equipment is relatively expensive and the number of sets is small, and the number of students participating in NC training is large, only through a large number of computer simulations to simulate the operation process of CNC machine tools, it is possible to observe and modify the machining program, because the calculation in NC programming Complex, for example, the manual calculation of surface parts is not yet possible, and CAD/CAM software must be used to automatically generate the machining program. Master CAM software is one of them. It enables students to design parts as well as produce parts.

2MasterCAM software features a company that integrates CAD and CAM functions into one application. In addition to the general CAD drawing function, the software also adds a strong curve and surface modeling function to meet the needs of parts processing. In terms of CAM, it has various machining methods such as turning, milling, drilling, wire cutting, etc. MasterCAM provides built-in two-way graphic file interface, including STA, IGES, VDA, DXF, CDL, STL and ASC and has an interface via RS232. The function of processing machine tool communication.

The geometric shape of the part needs to be generated by CAD drawing (the graphic data must be accurate, otherwise it will affect the accuracy of NC programming results), and the computer will automatically generate geometric data about the part graphic. According to these geometric data, MasterCAM will be processed according to the processing. Date: (1) 1 05-21 requires automatic extraction of these data, analysis and judgment and necessary mathematical processing to form appropriate data, the tool path file NCI converted to NC instructions. The NC command is transmitted to the CNC machine through the RS232 interface for production and processing.

The application of 3MasterCAM software generally carries out numerical control training. It is mainly used for the training of CNC machine tools. For the requirements of numerical control programming, only manual NC programming of simple parts is required and parts are processed by CNC machine tools. However, such CNC training is far from meeting the processing requirements for the processing of complex parts. It is necessary to convert the DXF document of the common three-dimensional modeling into the tool path document, that is, the NCI document, by the MasterCAM software, and then automatically generate the NC command.

Cup-shaped wireframes and curved shapes, for example, to shape a cup-shaped surface (see). It can be seen from the figure that there are many transitions between the straight lines in the cup-shaped wireframe size chart and the arc is large. During the machining process of the CNC lathe, the flank face of the turning tool is easy to crush the arc. , thus affecting the processing of dimensional accuracy. At the same time, when manually programming the cup shape, the tangent point between the straight line and the arc is more difficult to locate and calculate. The positioning calculation is not allowed to leave the embossing during processing, which in turn affects the smoothness and appearance of the workpiece. sense. When using CNC milling machine to process the part, if manual programming is used, not only the calculation amount is large, but the program is extremely error-prone during the machining process and the surface precision of the part is extremely low.

This can be avoided by milling with the radial function of MasterCAM's Mill machining. Firstly, the known wireframe is physically drawn by using the CAD function module in MasterCAM, and the two-dimensional cup-shaped wireframe size map is drawn according to the actual size given by the cup shape. In the three-dimensional coordinates, the two-dimensional cup-shaped wireframe size map is rotated 180 around a straight line parallel to the X-axis using the rotary surface command to generate a cup-shaped curved surface shape. Call the “radial” roughing function of the surface machining in the tool path and input the corresponding CNC machine information in the “radial” function table, for example input tool parameters (such as tool number, milling cutter size, speed, feed rate, coolant) , knife speed, radius correction), radial machining parameters (cutting direction error value, maximum angle, incremental angle, lower cutting point, cutting path allows continuous lowering and lifting) and machining clearance and edge setting. The rotating cup-shaped surface to be processed is selected, so that the system automatically generates the corresponding machining tool path, and the tool path is converted into the NC command recognized by the numerical control system through the post-processing function module in MasterCAM, and transmitted to the CNC machine tool through the network for processing. Through this process, students will have a deeper understanding of contemporary advanced manufacturing techniques and models.

4 Conclusion This training mode is still in the exploratory stage. In the process of practice, we feel that the training content, CNC machine tool simulation software, CAD/CAM software, etc. need to be further improved, and strive to establish a kind of basic adaptation to social needs. CNC teacher training mode.

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