Software Implementation In the Windows2000 operating system, the Visual C++ 6.0 integrated development environment is used. The object-oriented technology is used to develop the CNC inlay machining CNC system and CAD/CAM software, and the real-time precision trajectory control, image processing and processing process planning are completed. The module can automatically perform tool radius compensation and automatically generate tool movement trajectory, and can also perform man-machine interface monitoring and simulation processing. The system software consists of 2, where "contour transformation" refers to the contour of the dental inlay that is approached by the straight line segment. The following sections will focus on modules like processing and process planning.
Like the general CNC system, manual programming or automatic programming software, interactive CAD/CAM2NC programming integration system, etc. are used for NC programming. According to the characteristics of porcelain inlay processing, this paper uses the method of processing to perform automatic NC programming. First, a non-toxic material is inserted into the patient's cavity to obtain the model, and then the model is sliced, scanned, and then input into a computer for image processing to obtain the contour data of the cavity edge, and the system software processes the data, and according to the given The relevant parameters are used to compensate the tool radius and automatically generate the machining path file.
Like processing techniques include like scanning, contour tracking and more. The basic method of contour tracking <3> is: first find the pixels on the contour of the target object according to certain "probe criteria", and then use some "tracking criteria" to find other pixels on the target object according to some characteristics of these pixels. .
Judging the "tracking criterion" of the boundary point: if the four adjacent points of the up, down, left, and right points of a point are not valid pixel points, then it is the boundary point. This algorithm is to judge the eight points of each boundary pixel, and the calculation amount is large.
In order to improve the search speed and accuracy, the above algorithm is improved. Firstly, the bottom left boundary point is found according to the above criteria. Starting from the boundary point, the initial search direction is defined as the upper left; if the upper left point is the effective pixel The point is the boundary point, otherwise the search direction is rotated 45° clockwise.
This always finds the first valid pixel point. Then, the effective pixel point is taken as a new boundary point, and rotated 90° counterclockwise based on the current search direction, and the next effective pixel point is searched in the same way until the original boundary point is returned.
The planning of the tool path is based on the characteristics of the ceramic grinding process. In order to simplify the operation process, the machining process is arranged in a single clamping and one-time grinding process. As shown in Fig. 3, the innermost dotted line outline is the reduced contour. Since the processed dental inlay is glued into the cavity with a bio-inclusion, the between the dental inlay and the true dental cavity wall is 30 μm to 100 μm. The gap, but after sampling, the sampling error processing (sampling error processing refers to the use of line segments to approximate the contour of the cavity within the allowable error range) (for simplicity, the circle is used) is the actual cavity size, so There is a difference Δd between the two. Since the initial data obtained by the system is the actual contour of the cavity after the sampling error processing, we can only use this data as the reference when designing the software, and carry out the layered derivation of the tool path according to the relevant parameters, one round (layer) round ( Layer) expands outward. One of the wheels refers to the machining of the tool along the blank one week.
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