CNC machining mainly refers to the use of digital information recorded on the medium to control the machine tool, so that it can automatically perform the specified processing tasks. CNC machining can ensure that products achieve extremely high machining accuracy and stable machining quality; the operation process is easy to automate; CNC machining has high productivity and short production cycles; it can greatly reduce process equipment and meet the needs of rapid product replacement; it is usually combined with CAD Closely connected to realize the transformation of design ideas into final products. Students should focus on the connection between the processes and the meaning of each step in the learning of the entire CNC machining process. Broadly speaking, the composition of the entire process includes product analysis - graphic design - process planning - path generation - path simulation - path output - processing - inspection. In this section, a specific case is completed by way of demonstration, focusing on understanding the connection of each link. The material of the case processing is two-color plate or plexiglass.
1. Product Analysis Through product analysis, certain composition information and some specific processing requirements should be obtained.
2. Graphic design The graphic design should first be based on a detailed analysis of the product. For example, for the processing of seals, we must determine the font, text size, and seal type by analyzing the processing requirements.
3. Process planning Through the analysis of the appearance and processing requirements of the workpiece product in the early stage, each processing step is reasonably established from the overall situation of processing.
4. Path generation The process of path generation is actually that we implement the process planning through software, and at the same time optimize the tool path through parameter settings.
5. Path simulation After the CNC machining path is generated, we generally have no intuitive feeling about its final performance on the machine tool. Here we can check possible problems through path simulation, thereby reducing the scrap rate of actual processing. The general inspection focuses on the effect of the appearance of the workpiece, whether it is over-cut or under-cut, and whether the process planning of the path is reasonable.