JPH0234741B2 - NARAIRYOIKINOSOOTOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for sorting scanning areas in a scanning control device.

(Technical background of the invention and its problems) Recently, in a copying control device that causes a copying device to copy a model shape and causes a machine tool to process a workpiece according to the copied shape, a copying control device that uses a program to perform the copying process has been developed. Control devices are becoming widely used.

FIG. 6 is a block configuration diagram showing an example of this copying control device, and the copying mode control section 2 receives commands and data input from the operation panel 1A, or a copying program stored in the copying program storage section 1B. This command or the data word commanded by the copying program is analyzed, and each command and data such as copying mode, copying parameters, copying limit, etc. are read. Here, the copying mode indicates the type (pattern) of the copying method.
(B) Manual/NTC copying, (B) Surface reciprocating copying, (C) Surface unidirectional copying, (d) Contour full circumference copying, (E) Contour copying, (F) 3
There are dimensional copying, (g) rough cutting drill cycle, (h) rough cutting milling cycle, (li) position measurement cycle, etc., and data regarding each mode is stored in a copying mode storage unit (not shown). In addition, the scanning parameters indicate scanning data such as scanning speed and pick feed speed, as well as the type of scanning area.
As shown in FIGS. 9A and B, (A) straight line tracing area;
and (B) radiation tracing area radiated from the center point PP of the radiation, and these data are stored in the tracing parameter storage unit 3. In addition, the copying limit indicates the range of the copying area, as shown in Figure 7A.
As shown in and B, (i) right area limit Lr,
(ii) Left area limit Ll, (iii) Outer area limit Lo,
(iv) There is an inner region limit Li, etc., and this data is stored in the scanning limit storage section 4, and each of the above data is read out and commanded when necessary. Here, the above copying limit is usually
Straight lines parallel to the two orthogonal axes (X-Y axes) on the horizontal plane of the device are used, but depending on the shape of the model, there may be a lot of wasted scanning area, so conductive tape is used to match the desired scanning area. A hard potential line such as the one shown in Fig. 9A and B is used, or a soft potential line is used that sequentially sets multiple points as shown in Fig. 9A and B and connects these points in order. It is now set to . This soft potential line is a linear potential line that specifies the scanning limits Lr and Ll of the linear scanning area as shown in FIG. 9A,
The scanning limit of the radial scanning area as shown in Figure B
There are rotating potential lines for specifying Lo and Li, which are stored in the linear potential line storage section 4A and the rotating potential line storage section 4B of the copying limit storage section 4, respectively, and are used depending on the copying area. .

Therefore, the copying mode control section 2 reads respective data corresponding to the read commands of the copying mode, copying parameters, and copying limits from the storage sections 3 and 4, and displays these data in the graphic display control section 6. CRT display device 60
The area to be traced is displayed, and the operator confirms the area to be traced displayed on the above CRT screen.
When the copying operation execution signal SS is turned ON, the copying device 7 executes the copying operation. As is well known, the copying device 7 converts the displacement of the tip (stylus) of the tracer 70 in contact with the surface of the model 74 into an analog voltage and detects it with the displacement amount detection section 71, and the copying speed calculation section 72 converts the displacement of the tip (stylus) of the tracer 70 in contact with the surface of the model 74 into an analog voltage. While controlling the movement of the drive unit 73 so as to keep the displacement amount of the tracer tip 70 constant in response to a copying command corresponding to each copying mode commanded from the copying mode control unit 2 in response to the signal, This is to perform machining on a workpiece (not shown) in the same shape as the shape in the copying area instructed for the model.

Here, the operator visually checks the copying area displayed on the CRT screen, and further
If it is confirmed that the copying limit needs to be set finely, set the points P ₈ to P ₁₀ as shown in Figure 7A or the points shown in Figure 8A depending on the copying area.
P ₇ to P ₁₀ are additionally set, these points are rearranged (sorted) by a command from the operation panel 1A, and the tracing limit is reset using a new soft potential line. This sorting process is performed, for example, in FIG.
In the case of a linear potential line as shown in , each set point P1 to P6 and each added point P7 to P1
If we determine the size of the X coordinate value or Y coordinate value (for example, the X coordinate value in the case of the same figure) for all points of 0, rearrange them in the order of the determined coordinate values, and connect each point, we can obtain the same figure. A new desired soft potential line as shown in B is obtained. The above-mentioned sorting process is controlled by a linear potential line sorting control section 5A of the copying control device shown in FIG.

However, in the rotating potential line that sequentially connects the already set points P1 to P7 as shown in FIG. 7A,
If you want to add and sort points P8 to P10 and set a new rotary potential line, as described above, for example, determine the magnitude of the X coordinate value of each point, and use the linear potential line sorting control unit 5A. If you perform the sorting process to rearrange them in order, the result will be as shown in Figure B, and you will not be able to obtain the desired new soft potential line.Also, even if you perform this process for the Y coordinate value, the desired soft potential line will not be obtained. There is a problem that a potential line cannot be obtained. Therefore, when you want to sort the rotating potential lines as described above, conventionally, as shown in FIG. displayed on the screen, the operator judges the order in which to connect each point while checking the coordinate values of each point, and connects the points P1 → P2 → P3 → P
By instructing 8→P4→P9→P10→P5→P6→P7, there is no other way to obtain the desired soft potential line, which not only places a great burden on the operator but also requires many additional points. The problem was that the burden was too great, and even if some waste occurred, copying would continue in the originally set area.

(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and it is possible to easily create a new soft potential line by sorting new points added to the soft potential line for setting the scanning limit of the radial scanning area. The purpose of the present invention is to provide a method for sorting copying areas that can be set as follows.

(Summary of the Invention) This invention adds new points and sorts them to create a new rotary shape in order to change the tracing area specified in advance by a rotary potential line that sequentially connects a plurality of points on a model shape. When resetting the potential line,
A vector having a center point set inside the rotating potential line formed by the plurality of points, and having a direction from this center point to one point among the plurality of points;
A vector product with a vector having a direction from the one point to the added point is calculated for each of the plurality of points in turn, and the added point and two points where the sign of the vector product is reversed are respectively calculated. By tying them together and resetting new rotating potential lines, the scanning areas can be sorted.

(Embodiment of the Invention) FIG. 1 is a block configuration diagram showing an example of a scanning control device that implements the scanning area sorting method of the present invention, and in this figure, the same members as those in FIG. There is.

In FIG. 1, a rotary potential line sorting control section 5B added to the above-mentioned copying control device has a function of sorting the above-mentioned rotary potential lines and setting new soft potential lines. The sorting method will be explained below.

As shown in Figure 3, the point P that has already been set
Point P _a on the soft potential line connecting 1, P2...Pi,...Pn
When adding , and sorting a new soft potential line that includes this point P _a , for convenience, for example, the order of each point is correctly sorted to approximately the center of the curvature of the circular arc formed by these points P1 to Pn. The operator sets a center point P ₀ at a position, and a vector P ₀ P _i -----→ that connects this center point P ₀ and an existing point P _i , and a vector that connects this existing point P _i and an additional point P _a . Assuming P _i P _a ---→,
The vector product P ₀ P _i ---→×P _i P _a ---→ is determined. Here, the center point P ₀ , existing points P ₁ to _{P o} and additional points
Since P _a is on the same plane as the X-Y plane, the above vector product P ₀ P _i ---→×P _i P _a ----→ is
It becomes a vector parallel to the Z axis orthogonal to the Y plane. Then, as shown in Fig. 3, this point P _a is the vector P ₀ P _i ---
→
When it is on the right side of , this vector product points in the negative direction of the Z-axis, and when this point P _a is on the left side of vector P ₀ P _i+1 ――――→, this vector product P ₀ P _{i+ 1} ――――――→×P _i+1
P _a ――――――→
It is well known that is a vector pointing in the positive direction of the Z-axis. Therefore, this invention focuses on the fact that the positional relationship between points P _a and P _i can be determined by calculating this vector product and determining whether the value is positive or negative, and it is possible to sort the target scanning area. This is how it was done.

That is, for example, the coordinates of each point above are P ₀ (x ₀ , y ₀ ,
o), P _i (x _i , y _i , o), P _i+1 (x _i+1 , y _i+1 , o), P _a
Assuming (x _a , y _a , o), the vector product is as follows.

Then, calculating the determinants (1) and (2) above, in the example shown in Figure 3, x _i −x ₀ y _i −y ₀ x _a −x _i y _a −y _i = (x _i −x ₀ )(y _a −y _i ) −(x _a −x _i )(y _i −y ₀ )＜0 ……(1)′ x _i+1 −x ₀ y _i+1 −y ₀ x _a −x _i+1 y _a −y _i+1 = (x _i+1 −x ₀ ) (y _a −y _i+1 ) −(x _a −x _i+1 ) (y _i+1 −y ₀ ) > 0 ...(2)′, and the value of the determinant of this vector product changes from negative to positive, indicating that the additional point P _a is located between the points P _i and P _i+1 .

Here, when the value of the above determinant (1)' or (2)' becomes zero, that is, when the vector P ₀ P _i ---→ and the vector P _i P _a ---→ are on the same straight line and are the same Since the value of the determinant changes from negative to zero even when the vectors point in opposite directions or mutually opposite directions, the position of this additional point P _a can be determined as described above.
The above operations are explained in the flowchart in Figure 2 and in Figure 4.
A description will be given below with reference to one embodiment of the drawings.

As shown in FIG. 4A, points P ₁ to _{P 7} have already been set and stored as a rotating potential line in the rotating potential line storage section 4B, and points P ₈ to P 7 are already set on this rotating potential line.
When the operator instructs the rotary potential line sort control unit 5B to sort in order to add _P10 , the operator first sets the coordinates of the center point _P0 (step S1), and then this control unit 5B Check whether there are additional points. Then, if there is an additional point P _a (P ₈ ) (step S2), the coordinate values of this additional point P _a (P ₈ ) are read (step S3), and the starting point P ₁ of the existing point P _i read above is The coordinate values are read from the rotating potential line storage section 4B (step S4), and the vector product P ₀ P _i
×P _i P _a ――→ is calculated. (Step S5) and
As mentioned above, it is determined whether it is the value of the determinant of this vector product P ₀ P _i ×P _i P _a , and if it is negative, (step
S6), read the next existing point P _i (P ₂ ) (step
S7). Here, if this P _i does not exceed the above-mentioned existing point P _o (step S8), the above-mentioned step S5
Return to point P ₁ , P 2 , P ₂ , and repeat the above operation one after another.
P ₃ , ... and so on. Then, as shown in FIG. 4A, point _P4 is read in step S7, the vector product is calculated, and the sign of the determinant is determined. In step S6, the value is determined to be "positive" for the first time. Therefore, the existing points are renumbered by incrementing them by "1" so that this point P _i (P ₄ ) becomes P _i+1 (P ₅ ) (step S10), and
By setting this additional point P _a (P ₈ ) to this P _i (P ₄ ) (step S11). The new rotating potential line with point _P8 added to the existing points _P1 to _P7 is the point shown in Figure 4B.
This means that settings can be made like P ₁ to _{P 8} .

Then, in this way, the one additional point _P8 is sorted and the newly set rotating potential line is set again in the rotating potential storage section 4B (step
S12), return to step S2 above, and add the remaining additional points P ₉ ,
The above-described operation is repeated for _P10 to complete sorting of all additional points, and a new rotating potential line (line connecting points _P1 to _P10 ) as shown in FIG. 4C can be set.

In step S8 above, the next existing point P _i
If exceeds the end point P _o of the rotating potential line, then (i>
n), this additional point P _a is located outside this end point P _o , and all additional points can be sorted by setting this additional point P _a as a new end point P _o+1 (step S9).

Also, in step S6 above, point P _i is the starting point P ₁
If _{the above} vector _product is not negative _when This will allow you to sort.

(Modified example of the invention) In the above-mentioned embodiment, for convenience, the center point P ₀ is
I tried to set it almost at the center of the curvature of the arc shape composed of the existing points P ₁ to _{P 7} , but this center point P ₀
Even in the example shown in Fig. 5, all straight lines P ₁ P ₂ , P ₂ P ₃ , ...P ₆ P ₇ and P ₇ P ₁ that connect two adjacent points including the existing point and the additional point are It may be anywhere within the closed polygon surrounded by (hatched in the figure), and can be set arbitrarily within this closed polygon.

In addition, in the above embodiment, an example was shown in which additional points added to the existing rotary potential wire are sorted, but the scanning limit is not limited to the case where there are additional points, and the tracing limit is first set on the rotary potential wire. Even in this case, if the center point P ₀ is set as described above, sorting can be performed automatically.

Furthermore, in the above embodiment, when sorting, vector products are determined in order from the smallest number of points P _i to the largest number, but it is also possible to discriminate the vector products in order from the largest number to the smallest number. .

(Effect of the Invention) As described above, according to the scanning area sorting method of the present invention, it is possible to set a new additional point on the soft potential line for setting the scanning limit of the radial scanning area and reset the scanning limit. At the same time, a new copying limit can be automatically reset by simply setting the center point.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a copying control device implementing the present invention, FIG. 2 is a flowchart explaining the operation of the present invention, and FIGS. 3 and 4 A to C
and FIG. 5 is a diagram for explaining the present invention, and FIG. 6 is a block configuration diagram showing an example of a conventional copying control device.
7A and 8B and 8A and 8B are diagrams for explaining a conventional method of sorting scanning areas, and FIGS. 9A and 9B are diagrams for explaining scanning areas. 1A...Operation panel, 1B...Program storage unit,
2... Copying mode control section, 3... Copying parameter storage section, 4... Copying limit storage section, 4A... Linear potential line storage section, 4B... Rotating potential line storage section, 5A... Linear potential Line control unit, 5B...Rotary potential line control unit.

Claims (1)

[Claims] 1 In order to change the tracing area specified in advance by a rotating potential line that sequentially connects multiple points on the model shape, add new points, sort them, and reset the new rotating potential line. , a center point is set inside the rotating potential line formed by the plurality of points, and a vector having a direction from this center point to one of the plurality of points, and a vector from the one point to the added vector. A vector product with a vector having a direction to the point is calculated for each of the plurality of points in turn, and a new rotating potential is created by connecting the added point and two points where the sign of the vector product is reversed. A method for sorting tracing areas characterized by resetting lines.