figure 1 In straight line processing, the positive and negative of the scalar product of the correction vector corresponding to the programming vector and its corresponding correction can be determined. In the figure, BC is the programming vector, B'C' is the correction vector corresponding to BC, and α is the angle between them. then: Obviously, when In the inner contour arc machining (when the arc machining command is G41G03 or G42G02), if the selected tool radius rD is too large, it exceeds the radius R of the arc to be machined, that is: r > R will be generated Cutting, as shown in Figure 2. It can be seen that the over-cutting phenomenon occurs only when the arc machining command is G41G03 or G42G02 combination; if the command is G41G02 or G42G03, the over-cutting phenomenon does not occur when the outer contour cutting is performed. Analyze these two kinds of situations, can get the overcut cutting flow when the tool radius is greater than the required processing arc radius, as shown in Fig. 3. Figure 4 below shows an example of an overcut generated during arc machining. In the actual processing, there are various kinds of over-cutting conditions, which are limited to time and cannot be listed one by one. However, through the above analysis, it can be seen that the over-cutting phenomenon occurs when the transitional mode is a shortened type. Therefore, according to this principle, the condition of over-cutting can be judged, and the over-cutting discrimination program can be designed accordingly. Weld Neck Blind Flange,Neck Flange,Weld Neck Flange Welding,Press Neck Flange CHINA·SNGONG FLANGE MANUFACTURING CO., LTD. , https://www.sngong.com
1. Overcutting discrimination in straight line processing The following Fig. 1 demonstrates overcutting in straight line processing. The contour to be machined is composed of straight sections. If the tool radius is selected to be too large, over-cutting will occur, resulting in scrapped workpieces. In Fig. 1, the programming trajectory is ABCD, and B' is the intersection point of the tool center trajectory corresponding to AB, BC. When reading the programming track CD, the upper tool center path B'C' is corrected to determine that the tool center should move from point B' to point C'. Obviously, over-cutting phenomenon as shown in Fig. 1 will certainly occur at this time. 
Scalar product 
(ie 90o <α <270o), the tool will move away from the programmed path, causing over-cutting. In the FLASH animation α = 180o, so it must have been cut.
2ã€Determination of overcut during arc machining 
In the foregoing, we said that C cutter compensation can avoid overcutting, which means that if the programmer has for some reason compiled a machining program that is sure to produce overcuts, the system can send an alarm signal in advance during the operation to avoid over-cutting accidents. happened. The following will discuss the overcutting principle.