The reason for editing and modifying the tool path is that for many complex surface parts and molds, in order to generate the tool path, it is often necessary to extend the surface to be machined and its constraint surface, and construct some auxiliary surfaces. At this time, the generated tool path generally exceeds the range of the machining surface, and it needs to be cut and edited appropriately; In addition, the original data used in surface modeling makes the generated surface not very smooth in many cases. At this time, the generated tool path may have an abnormal scene at some arrival points. All these require the tool path editing function.
1、 Functions of tool path editing system
Generally speaking, the functions of the tool path editing system include the following aspects:
1. Tool path index and position data list
2. Fast graphic display of tool path
3. Geometric transformation of tool path
4. Deletion and restoration of tool path
5. Cutting, segmentation, connection and restoration of tool path
6. Modification of tool location on the tool path
7. Homogenization of cutting points on the cutting path
8. Transposition and reversal of tool path
9. Saving and loading of tool path
10. Arrangement of tool path
For a specific image CNC programming system, its tool path editing system may only contain some functions.
2、 Design of tool path editing system
The basic concept of data structure design of tool path editing system.
1. Edit objects: tool path, cutting block, cutting line, cutting segment, and tool location.
2. Tool path: the set of cutting lines in the buffer of the tool cabinet.
3. Cutting block: a subset of adjacent cutting lines in the tool path.
4. Cutting line: a set of continuous tool points.
5. Cutting segment: a subset of adjacent tool points on the same surface in the cutting line.
6. Knife position: Knife Center + appropriate amount of knife axis + normal vector of knife swing plane.
3、 Operating instructions of system data structure
Before editing the tool path, first open the tool position file where the tool path to be edited is located, then dynamically apply for the allocation of the original cutting line buffer according to the size of the edited object data, and load the edited object into the load original cutting line buffer.
