JPS63188206A - Processing system for digitization data - Google Patents

Abstract

PURPOSE:To produce the NC data that is free from the tool interference by obtaining a form as the shift result of a stylus on the digitization data and a tool action as the shift result of the tool on a form point respectively. CONSTITUTION:The digitization data copied from a master model is sent to a digitization point production part 4 for production of the digitization point group data. This group data is sent to a form point production part 5 and offset by an amount equal to the diameter of a measuring stylus. The form point data obtained as the result of said offset is sent to a tool center point production part 7 and offset by an amount equal to the diameter of a processing tool. Then, the tool center point data obtained as said offset is sent to an NC data production part 8 for production of the NC data with addition of the data on the NC auxiliary actions including an axis feeding speed, etc. In such a way, the tool interference is eliminated regardless of the tool and model forms for acquisition of the NC data free from bite.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a digitized data processing method for processing digitized data to create NC data.

(Technical background and problems to be solved) In mold machining, it is difficult to process highly complex models such as press molds using automatic programming, so copy machining is currently the mainstream. however,
Copy processing also has various problems, as the production of the master model requires a lot of manual labor and a large amount of time, and when making multiple identical molds, there is a drawback that the errors between the molds become large. be. Furthermore, female molds are made by molding male molds with plaster, resin, etc., but there is a drawback that accuracy deteriorates due to deformation due to thermal expansion and moisture at that time. Furthermore, in actual copying machining, each time the diameter of the tool used is changed, it is necessary to repeat the copying with a stylus of the same diameter, and there is also the problem that the machining speed cannot be increased above the copying speed. A digitized data processing method is needed to solve the above problems.

In the conventional digitizing data processing method, as shown in Fig. 5, digitizing data is obtained by using a digitizer to trace a mold model 1 using a stylus 2 continuously as shown by the broken line starting at 28. However, from such a tracing operation, data is measured at regular intervals as shown in Figure 6, or data is converted to regular intervals and digitized point cloud data (po., ..., PO7, ...・・・・・・、
P4゜,...

P47) is obtained. Then, as shown in FIG. 7, the normal vector N is determined by approximating the area around the point of interest to a free-form surface or an analytic surface (plane trispherical surface, etc.), thereby determining the shape point and tool center point. However, in such a method, the relationship between the diameter (radius r) of the tool 2 and the diameter (radius R) of the machining tool 3 (for example, a ball end mill) is as shown in FIG. In the part where the radius R is small, the trajectories obtained by offsetting the tool diameter in the normal direction interfere as shown in Fig. 9, and when machining, the trajectories shown by 3A and 3B in Fig. 10 will occur. will occur.

(Object of the invention) The present invention has been made in view of the above-mentioned circumstances. ``An object of the present invention is to eliminate tool interference regardless of the tool shape and model shape in creating a tool trajectory, and to eliminate digging. An object of the present invention is to provide a digitized data processing method that enables the creation of NC data.

(Means for Solving the Problems) The present invention relates to a method for processing digitized data obtained by copying, and an object of the present invention is to process digitized point cloud data of digitized data obtained by copying a master model. obtain shape point data by giving an offset corresponding to the measurement stylus diameter to the digitized point group data, obtain tool center point data by giving an offset corresponding to the machining tool diameter to the shape point data, This is achieved by adding predetermined data (for example, NC auxiliary operation data) to the center point data to create NC data.

(Operation of the Invention) In the present invention, tool interference is completely removed in the process of first creating shape point data from digitized points and then creating tool center point data from this shape point data. To this end, an offset corresponding to the stylus diameter is given to the digitized point group data, and an offset corresponding to the machining tool diameter is further given to the resulting shape point data to obtain tool center point data.

(Embodiment of the Invention) FIG. 1 shows in block form an example of the configuration of a device that implements the method of the present invention, with a CPU 15 that performs overall control, a CRT 16 that is an input/output device, a keyboard 17,
A tablet 18, a printer 19, a paper tape puncher/reader 20, a plotter 21, and a floppy disk device 22 are connected. In addition, the CPt115 has measurement conditions/processing conditions for inputting measurement conditions and processing conditions for digitized data.
A processing condition specifying section I4 is connected, and a digitizing data storage section 9 that stores digitizing data in NC data format, a digitizing point data creating section 4 that obtains digitizing points with only coordinate values, and digitizing points with only coordinate values. A digitizing point data storage section 10 that stores data, a shape point data creation section 5 that creates shape point data, and a shape point data storage section 11 that stores shape point data containing only coordinate values.
Tool center point data creation section 7 that creates tool center point data
, a tool center point data storage section 12 that stores tool center point data including coordinate values only, an NC data creation section 8, and an NC
The data storage section 13 is connected, and each of the above devices is connected to the CPU 1.
5 and are connected to each other by a pass line.

In such a configuration, in the present invention, as shown in FIG. 2, digitized data obtained by copying the master model is first input to the digitized data storage section 9 and stored.

Then, the digitized data in the digitized data storage section 9 is transferred to the digitized point creation section 4 to create digitized point group data, which is input to and stored in the digitized point data storage section 10. Next, the digitized point data read from the digitized point data storage unit IO is transferred to the shape point data 5, and the data is offset by the diameter (r) of the measuring stylus 2, and the resulting shape point data is is input into the shape point data storage section 11 and stored. The shape point data stored in the shape point data storage section 11 in this way is transferred to the tool center point creation section 7, where it is offset by the diameter (R) of the processing tool 3, and the resulting tool is The center point data is manually stored in the tool center point data storage section 12. Next, this tool center point data storage section 12
The tool center point data stored in the .

As described above, according to the present invention, when giving an offset corresponding to the eight diameters of the measuring stylus 2 and the machining tool 3, the tool center point is not determined by approximately determining the normal vector, but the stylus 2 and the machining tool 3 are It is determined as a result of each offset of the tool 3.

FIG. 3(A) shows the state in which the shape point data SP is obtained. This is the result that when eight balls with the same diameter as stylus 2 are placed at the digitizing point OP, the lowest value is left by sequentially finding the intersection points with the balls at a grid position with a fixed position in the X and Y directions. . With respect to the forest movement of the stylus 2, this point group data is shape points. In this case, it is also necessary to perform interference calculations for all gratings that the stylus 2 interferes with in the pick direction as well. Furthermore, by checking the tolerance of the grid coordinate values after the interference calculation, it is easy to create as many grids in the middle as necessary. The lattice point group data of the shape points for which the interference calculation has been completed is stored in the shape point data storage section 11.

In addition, Fig. 3 (B) shows the tool 3 with the shape grid point as the center of the tool.
As a result of movement, the tool center point TP is determined. The tool is moved in the order of the shape point data in the shape point data storage section 11, and tool center lattice points are created using the same method used to obtain the shape lattice points. The tool center grid point group data for which the interference calculation has been completed in this manner is stored in the tool center point data storage section 12.

Furthermore, FIG. 4(A) shows the movement of the tool 3 based on the NC data output from the NC data storage section 13. That is, the NC data creation section 8 adds auxiliary operation data necessary for machining, such as the spindle rotation speed and shaft feed speed, to the tool center point data in the tool center point data storage section 12 to create NC data. FIG. 4(B) shows the shape after machining, and shows that tool interference is avoided in the portion with a larger curvature than the tool radius R, and a small amount of uncut CR remains.

As described above, the method of the present invention creates NC data by obtaining the shape as the result of the movement of the stylus 2 on the digitized data and the tool movement as the result of the movement of the tool 3 on the shape point. There is. Therefore, accurate offset results can be obtained without determining the normal vector, and NC data without tool interference can be created.

(Effects of the Invention) According to the present invention, it is possible to freely set the tool shape and tool dimensions, and since the tool center point is created based on the shape point, it is possible to set the tool shape and tool dimensions as desired. By inverting the shape points, it is also possible to create NC data for machining both male and female molds from digitized data taken from the male model.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of the configuration of a device that implements the method of the present invention, Fig. 2 is a block diagram systematically showing the operation of the method of the present invention, Figs. 3 (8), (B), and 4. (A)
, (11) are diagrams for explaining the present invention in detail, and FIGS. 5 to 10 are diagrams for explaining the conventional processing of digitized data, respectively. 1... Mold model, 2... Measuring stylus, 3...
...Processing tool, 4...Digitizing point creation section, 5...
・Shape point data, 7... Tool center point creation section, 8...
NC data creation section, 9... digitized data storage section,
lO... Digitizing point data storage unit, 11... Shape point data storage unit, 12... Tool center point data storage unit,
13...NO data storage unit, 14...Measurement condition/processing condition designation unit, 15...cpu. Applicant's agent Yuzo Yasugata Figure 2 (A) (B) Figure 3
Figure (A) (B) 4th Figure 5 i $ 7 Figure hand 9 Figure PO. Figure 6 fj Figure $IO diagram

Claims (1)

[Claims] Obtain digitized point cloud data of digitized data obtained by copying the master model, give an offset corresponding to the measurement stylus diameter to the digitized point cloud data to obtain shape point data, and add the shape point data to the machining tool diameter. Find the tool center point data by giving the corresponding offset,
A digitizing data processing method characterized in that NC data is created by adding predetermined data to the tool center point data.