I. CNC machine tool programming methods There are three methods for CNC machine programming: manual programming, automatic programming and machining center CAD/CAM.
1. Manual programming Manually complete part drawing analysis, process processing, numerical calculation, writing program list until program input and inspection. Suitable for point machining or parts with less complex geometries, but it is very time consuming and prone to errors when programming complex parts.
2. Automatic programming The process of programming a part program using a computer or a programmer is convenient for complex parts.
3. CAD/CAM
Using CAD/CAM software to achieve automatic modeling and image programming. The most typical software is Master CAM, which can complete the programming of milling two-coordinate, three-coordinate, four-coordinate and five-coordinate, turning and wire cutting. Although this kind of software has a single function, it is easy to learn and the price is low. The choice of business.
II. Contents and steps of CNC machine programming 1. Main contents of CNC machine tool programming Analyze part drawings, determine machining process, perform mathematical processing, write program list, make control medium, perform program check, input program and workpiece test.
2. Steps of CNC machine tools 1) Analyze part drawings and process processing Analyze the geometrical dimensions and technical requirements of the parts according to the drawings, clarify the contents and requirements of the machining, determine the machining plan, determine the machining sequence, design the fixture, select the tool, and determine Reasonable route and reasonable cutting amount.
At the same time, it should also play the function of the numerical control system and the ability of the CNC machine itself, correctly select the cutting point, the cutting method, and minimize the auxiliary time such as tool change and indexing.
2) Mathematical processing Before programming, according to the geometric characteristics of the part, a workpiece coordinate system is first established. The function of the numerical control system is based on the requirements of the part drawing, and the machining route is determined. On the established workpiece coordinate system, the movement track of the tool is first calculated. For parts with simple shapes (such as parts composed of straight lines and arcs), you only need to calculate the starting point, end point of the geometric element, the center of the arc, the intersection of the two geometric elements, or the coordinate value of the tangent point.
3) Write the part program list After the machining route and process parameters are determined, the parts program list is written according to the specified code and block format specified by the CNC system.
4) Program input 5) Program verification and first piece trial cutting