JP2004021953A - NC data tool path display method and NC data analysis method - Google Patents

Abstract

When a mark is formed on a workpiece, if the mark is periodic, the cause is on the processing machine side and it can be determined that there is no problem with the NC data. Some items cannot be determined whether they are periodic. By displaying the tool trajectory that is divided into appropriate regions and color-coded for the machining program in which such marks have occurred, it is possible to determine whether the marks are periodic marks.
A specific axis is selected from XYZ three axes of NC data. An area in the direction of the specific axis is designated for each predetermined division width from a desired base position with respect to the specific axis. A predetermined display attribute is given to each area (22). The tool trajectory is displayed along three XYZ axes in a display form according to the display attribute for each area with respect to the specific axis (25).
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of displaying a tool path of NC data and a method of analyzing NC data, and more particularly to an improvement in a display method of displaying a tool path of NC data for machining a workpiece by XYZ 3-axis feed.
[0002]
[Prior art]
When performing complicated machining using machining equipment, NC control machining is suitable. NC data created by CAD / CAM is used, and a machining center equipped with a high-speed feed function is used for such complex machining with high accuracy and high efficiency. Processing can be performed. As this type of processing, for example, machining of a die or the like is known.
[0003]
As described above, the NC data plays the most important role in providing an optimal machining trajectory for complicated shape machining. However, since the NC data incorporates all control commands, the amount of data becomes enormous, and there has been a problem that it is difficult to determine the quality of the NC data once created.
[0004]
Of course, conventionally, the completed NC data is displayed on a monitor in various display formats, and various tables such as built-in tool types, surface roughness, and allowable values of accuracy are checked. Similarly, the machining locus along the three axes of XYZ, which is the heart of the NC data, is also displayed on the monitor, and the monitor is used to check the quality of the machining locus itself or collision interference with other parts of the tool on the monitor. By simulation, the quality is confirmed.
[0005]
[Problems to be solved by the invention]
However, as described above, the data amount of the NC data itself is enormous, and a delicate processing situation when performing complicated and precise processing can be determined by merely confirming the delicate processing status with a simple visual display on a monitor. It was difficult to do.
[0006]
Further, when processing marks are formed on a workpiece when processing is actually performed using such NC data, the cause of the processing marks must be quickly and accurately determined. There is a problem that there is no appropriate display method of NC data corresponding to the cause search.
[0007]
Generally, there are basically two types of causes for the above-mentioned processing marks. The first is a defect in the NC data, and the second is a cause on the processing machine side.
[0008]
Conventionally, when a process mark is found on a workpiece, it is not possible to immediately determine which side has the cause, and it is often necessary to analyze the cause of the trace while always investigating both in parallel. It was generally done. However, such conventional methods require a great deal of time to elucidate the causes of traces, and in particular, as described above, recent NC data has an enormous amount of data, and it has been extremely difficult to analyze all of them. .
[0009]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a new method of displaying a processing locus which has not existed in the past, and to provide a trace of a workpiece using such a display method. It is an object of the present invention to provide a method for quickly analyzing the causes.
[0010]
[Means for Solving the Problems]
In order to solve the above problem, the present invention is characterized in that a tool trajectory of NC data for processing a workpiece by three-axis feed of XYZ is displayed with a display attribute according to a specific rule.
[0011]
That is, for one specific axis selected from the three axes of XYZ for displaying the tool trajectory, an area in a specific axis direction is specified for each predetermined division width from a desired base point position, and a predetermined Preferably, different display attributes are provided, and the tool trajectory is displayed along the XYZ three axes in a display mode according to the display attribute for each area with respect to the specific axis.
[0012]
Therefore, according to the present invention, since the display attribute is different for each area having a predetermined division width with respect to the specific axis, it is possible to easily determine the periodicity of the tool trajectory along the specific axis.
[0013]
Further, according to the present invention, it is possible to determine whether the NC data is good or bad by using the tool trajectory displayed by the display method.
[0014]
That is, when a machining mark is formed on a workpiece machined using the NC data, whether the trace of the machining mark is caused by the NC data using the above-described display of the tool trajectory according to the present invention, Can easily be determined.
[0015]
That is, according to the present invention, the Z axis is specified from the trace suspect axis, for example, three axes of XYZ, from the processing trace of the workpiece, and the trace period in the Z axis direction is determined to have a period. Obtained from processing marks.
[0016]
Then, with respect to the specified axis, for example, the Z-axis among the three axes for displaying the tool trajectory of the NC data, the position of any one of the marks is set as a base position, and the mark axis is moved in the direction of the specific axis for each mark cycle obtained from the processing mark of the workpiece. An area is designated, and a tool trajectory is displayed along three axes of XYZ with predetermined display attributes as described above.
[0017]
In the present invention, when the processing trace of the workpiece matches the display pattern of the tool path drawn by the display attribute, the processing trace of the workpiece is a periodic trace, and the NC pattern is benign, that is, the NC pattern is normal. On the other hand, it is estimated that there is a trace factor on the processing machine side.
[0018]
That is, the periodic mark, which is a periodic defect, is peculiar to the processing machine and is almost impossible in the NC data itself. Therefore, if a processing mark occurs, if it is a periodic mark, the cause is processing. It can be empirically determined that it is on the machine. In that case, the verification work of the NC data is unnecessary, and only the defect of the processing machine needs to be checked. For example, it can be easily determined whether or not a processing mark generated by processing a simple shape such as a slope shown in FIG. 5 is a periodic mark. However, when a processing mark generated by processing a complicated curved surface as illustrated in FIG. In addition, since the shape of the processing mark becomes complicated, it is often impossible to visually determine whether the processing mark is a periodic mark.
[0019]
In the present invention, as described above, since the display characteristics are different for each of the predetermined division regions with respect to the specific axis, it is possible to easily determine the periodicity of the tool trajectory along the specific axis.
[0020]
In particular, even when it is not possible to determine whether or not a plurality of processing marks generated as a result of complicated shape processing as shown in FIG. 6 are periodic marks, the NC data display method of the present invention is used to make a determination. Becomes possible.
[0021]
Therefore, when there is a trace cause on the processing machine side, it is possible to promptly investigate the cause without analyzing the NC data.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 shows an example of a display device for realizing a display method according to the present invention. The NC data input unit 10 receives all the data on the three XYZ axes, and the trajectory information extraction unit 11 extracts only the tool trajectory information on the XYZ three axes from these data and removes other control information. The extracted tool path information is further given a desired display attribute characteristic of the present invention by the path information analysis unit 12.
[0024]
That is, a characteristic of the present invention is that a region in the direction of a specific axis is specified for each predetermined division width from a desired base point position with respect to a specific axis selected from three axes, for example, the Z axis. That is, a predetermined display attribute is given.
[0025]
As a result, according to the present invention, the tool trajectory for the specific axis (Z axis) is identified and displayed by a color or a display line type for each region like a contour line.
[0026]
Therefore, the specific characteristics of the tool path with respect to the specific axis can be easily known on the monitor by such a display pattern, and various NC data can be obtained based on the display pattern of the tool path drawn by the selected display attribute. An analysis is performed. Such an analysis is based on, of course, checking whether the originally planned tool path is correctly embodied, judging the quality of NC data by matching / mismatching with the machining trace when actually machining, or based on various experiments or experiences. Includes pattern confirmation for each processing type.
[0027]
In order to determine the display attributes described above, in the embodiment shown in FIG. 1, a trajectory attribute setting unit 13 and a trajectory attribute storage unit 14 are provided. The trajectory attribute setting unit 13 is for selectively inputting a display color or a display line type that can be given to each of the divided areas, and the trajectory attribute storage unit 14 stores the trajectory attribute based on these setting inputs. A specific axis for division, a coordinate value serving as a division reference, a division width value, a display color or a display line type specified for each division area, and the like are stored in the locus information analysis unit 12. Supply.
[0028]
As described above, a display attribute is given to a specific axis for each predetermined area, and these data are sent to the trajectory display unit 15 together with other axis data, and the XYZ three axes of the tool trajectory according to the display attribute are provided. Display can be performed. At this time, the display mode storage unit 16 can arbitrarily give a display mode according to a desired viewing angle, a magnification, and the like to the three-axis display.
[0029]
FIG. 2 schematically shows a schematic process and a display form for displaying the tool trajectory according to the present invention using the above-described display device.
[0030]
The NC program 20 is processed by the display device shown in FIG. 1. As shown in FIG. 2, an area related to a specific axis is analyzed in step 21, and a display color is determined in step 22. Then, based on the color determination, the display device 23 performs color-coded display for each divided area.
[0031]
In FIG. 2, a display indicated by reference numeral 24 indicates a display pattern with different display attributes of each of the divided regions with respect to the Z axis on the XZ plane. In the drawing, a region in the Z-axis direction is shown for each predetermined division width from a desired base point position, and a region in the Z-axis direction is shown for each predetermined division width from the X axis by reference numerals E, D, C, B, and A. Is displayed, and different attributes are displayed for each area. In the figure, this display attribute is shown as a difference in display line type. The tool trajectory thus obtained is displayed along three XYZ axes as indicated by reference numeral 25, and various analyzes are performed by judging the display pattern of the drawn tool trajectory. These analyzes determine whether the NC data is good or bad, determine whether or not the NC data has a trace cause when a processing mark is formed on the product, or provide a problem of the NC data based on experience to the data manager as information. be able to.
[0032]
FIG. 3 shows another example of a display pattern along three axes of XYZ displayed with different display attributes, and the contents correspond to those shown by reference numeral 25 in FIG. According to FIG. 3, display attributes different from those of the embodiment shown in FIG. 2, that is, two types of A color and B color are determined.
[0033]
In the present invention, it is not always necessary that all the regions assigned by the division width have their own display attributes, and only the adjacent regions are different for each region divided by the division width as shown in FIG. It is realistic to give display attributes. In this case, it is possible to pattern a wide area by simply repeating two types of display attributes.
[0034]
As described above, according to the present invention, when displaying a tool trajectory, an area designated for each predetermined division width from a desired base point position with respect to a specific axis is displayed with a different display attribute, so that a specific axis is displayed. It is understood that a unique display pattern is obtained, and that various useful conclusions can be obtained by analyzing the display pattern. This analysis is used, for example, for quality determination when creating NC data, and a specific display pattern can be obtained for a certain type of processing based on experience. Only a specific part of the data can be selectively analyzed.
[0035]
That is, as shown in FIG. 7, it is assumed that a processing mark of a complicated shape processing performed using NC data is a periodic mark, assuming that the processing mark may be a periodic mark. Then, the suspect axis of the trace cause is identified from the machining traces as, for example, the Z axis, and any one of the trace positions with respect to the specified axis among the three axes is set as the Z coordinate value indicated by a in FIG. Assuming that the difference between the trace and the adjacent trace, that is, b in FIG. 7 is a cycle (pitch), a region in a specific axis direction is designated for each trace period, a predetermined display attribute is given to each region, and a tool path is defined. indicate. As a result, if the actual machining trace coincides with the boundary of the tool trajectory region, for example, the boundary of color coding, the above assumption is considered to be correct and can be determined as a periodic trace. It is determined that it is not. In addition, since the input value is often input as an actual measurement value of the workpiece, it is conceivable that the processing trace does not exactly match the display, but it is sufficient if it is considered that they match within a significant range.
[0036]
FIG. 4 is a flowchart illustrating a more detailed embodiment of the tool path display method according to the present invention.
[0037]
In step S1, a specific axis, a division width, and a base point position are input first.
[0038]
For example, when the present invention is used for an NC data analysis method, a preferred embodiment is a case where a trace factor is estimated from a processing trace of a workpiece processed using NC data.
[0039]
That is, very slight stripes or scratches may be detected on the workpiece. In general, it is extremely difficult to analyze the cause of such a small mark, and it is particularly difficult to specify whether the cause is on the processing machine side or the NC data. Often found as a cause on the processing machine side are periodic defects in the feed axis of the machine, such as problems with the accuracy of the feed screw and gear, torque ripple of the feed motor, position detector accuracy, etc. Generates periodic streaks on the surface. On the other hand, the NC data is not always perfect, and there may be errors in the coordinate values at the coordinate points of the commanded tool trajectory. These must be reliably eliminated. Is not easy to detect.
[0040]
Once the above-mentioned slight streaks or scratches are formed on the workpiece, if it is easy to determine that the cause is not in the NC data, it is not necessary to perform a huge analysis process of the NC data. It can be significantly simplified.
[0041]
Such an improvement is particularly effective in the case of periodic traces, and according to the present invention, it is possible to quickly determine the causal relationship between such periodic traces and NC data.
[0042]
Therefore, the specific axis division width, the base point position, and the like shown in FIG. 4 can be estimated from the trace at the time when the above-described processing trace occurs, using the trace suspected axis as the specific axis. Further, if the suspected axis is specified in this way, the trace period in the axial direction can be obtained from the trace period of the machining trace determined to have a period, and this can be used as the division width. Therefore, in step S1, any data can be input, but it is understood that it is also possible to input specific data obtained from a trace when a processing trace occurs.
[0043]
In the present embodiment, the base point position is set to any one of the mark positions marked on the workpiece as the base point position, and the mark period is set to a mark period obtained by converting the mark period on the selected specific axis. ing.
[0044]
The specific axis in the present embodiment is useful to be the trace cause suspected axis determined by observing the processing trace, and which of the trace cause suspected axes is determined based on the experience of the worker. .
[0045]
Next, in step S2, NC data is read. Generally, NC data is divided into blocks, and reading is performed for each block in step S2. It is determined in step S3 whether or not the read block NC data is an end code. If the block NC data is an end code, the process is terminated because there is no more NC data. If not, the process proceeds to step S4. Proceed to. Since each block data is not necessarily tool locus data but also includes other control data, only locus data, that is, coordinate values is extracted in step S4, and if it is other control data, the process proceeds from step S10. It returns to step S2.
[0046]
In the locus data extracted in step S4, only the specific axis coordinates are extracted as the coordinate values H in step S5. In step S6, a difference (h1) from the base point (K) is obtained for all coordinate values H on the Z axis.
[0047]
Next, in step S7, the difference h1 is divided by the division width B to obtain an integer part (S), and a display color is given from the correspondence table according to a predetermined display attribute (step S8). Plot the color at the point corresponding to the display position of the block read above. By repeating the above operation until the end block comes out, the tool trajectory shown in FIG. 3 described above can be drawn. The display in step S9 is performed not only for the specific axis given a predetermined display attribute but also for the other two axes.
[0048]
As described above, the tool trajectory is drawn according to the given display attributes, and the NC data is analyzed by observing the display pattern.
[0049]
As described above, when analyzing the machining trace, when the display pattern of the tool trajectory drawn by the predetermined display attribute matches the machining trace of the workpiece, the machining trace of the workpiece is a periodic trace, It is possible to estimate that the NC data is benign, that is, normal, but rather has a cause on the processing machine side. Therefore, in this case, there is no need to analyze and check a large amount of NC data, and there is an advantage that the cause of the processing trace can be pursued in a very short time.
[0050]
In the present invention, the base point position and the division width may be determined by actually measuring, or by inputting a random numerical value and repeating trial and error, or by inputting an empirical value that the processing machine has conventionally, A matching value can also be determined.
[0051]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the tool locus | trajectory with respect to a specific axis | shaft is displayed on a contour line, this display pattern can be observed very clearly on a monitor, and it becomes possible to grasp | ascertain the characteristic of various NC data instantaneously. . Further, when a processing mark is generated, there is an advantage that it is extremely easy to determine whether the cause is in the NC data or the processing machine side.
[0052]
Further, according to the present invention, it is possible to discriminate even a processing mark generated in a complicated shape processing whether it is a periodic mark or not. In the case of a periodic mark, it can be determined that the cause is not the NC data but the processing machine side. Therefore, there is no need to verify the NC data. You can do it in time.
[Brief description of the drawings]
FIG. 1 is a block diagram of a display device for realizing a tool trajectory display method according to the present invention.
FIG. 2 is a diagram showing an example of a simple process and a display pattern for implementing a tool path display method according to the present invention.
FIG. 3 is a diagram showing another embodiment of the display pattern in FIG. 2 in further detail.
FIG. 4 is a flowchart showing more detailed steps of the tool path display method according to the present invention.
FIG. 5 is an explanatory view showing an example of a processing mark.
FIG. 6 is an explanatory diagram showing an example of a processing mark in a complicated processing shape.
FIG. 7 is an explanatory diagram showing an example of specifying a region to which a display attribute is given in the present invention.
[Explanation of symbols]
1 NC program, 23 display devices, 25 display patterns.

Claims (4)

In a method of displaying a tool path of NC data for processing a workpiece by 3-axis feed of XYZ,
For a specific axis selected from the three axes, a region in a specific axis direction is specified for each predetermined division width from a desired base point position,
Give a predetermined display attribute to each area,
A tool locus display method for NC data, wherein a tool locus is displayed along a XYZ three-axis in a display form according to the display attribute of each area for a specific axis. The method of claim 1, wherein
A method for displaying a tool path of NC data, wherein different display attributes are given to at least adjacent areas of the divided areas. An NC data analysis method for determining whether NC data is good or bad from a tool trajectory of NC data for processing a workpiece by 3-axis feed of XYZ,
For a specific axis selected from the three axes, a region in a specific axis direction is specified for each predetermined division width from a desired base point position,
Give a predetermined display attribute to each area,
For a specific axis, a tool trajectory is displayed along three axes of XYZ in a display form according to the display attribute of each area,
An NC data analysis method comprising: estimating that NC data is benign and has a trace cause on a processing machine side when a processing trace of a workpiece matches a display pattern of a tool path drawn by the display attribute. An NC data analysis method for determining whether NC data is good or bad from a tool trajectory of NC data for processing a workpiece by 3-axis feed of XYZ,
Identify the trace cause axis from the machining trace of the workpiece,
With respect to the specified axis of the three axes, any one of the mark positions is set as a base position,
Assuming that the difference between the trace at the above-mentioned trace position and the adjacent trace is the period, specify the area in the specific axis direction for each trace period,
Give a predetermined display attribute to each area and display the tool path,
An NC data analysis method characterized by estimating that NC data is benign and has a trace cause on a processing machine side when a processing trace of a workpiece matches a display pattern of a tool path drawn by the display attribute.

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