JPH1063326A - Nc automatic programming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply generating NC data for working a contour even at the time of working the elements of upper and lower working routes by coordinating one to many by automatically dividing optional one element on a selected upper or lower side and re-defining the coordinating relation between upper/lower working routes. SOLUTION: This device consists of CPU 1, a graphic display 2, a keyboard 3, etc. In this device, when the elements of the upper/lower working routes need working by coordinating one to many, an operator operates an editing execution key to make CPU 1 execute processing. In this processing, one element of the upper working route is selected first. Then the elements of the lower working route to coordinate with this is plurally selected, one element of the selected upper working route is divided at the rate of the length of the element of the lower working route and a dividing point is inserted into one element of the upper working route. Then, by re-defining the coordinated relation, NC data can be generated while keeping the coordinating relation of positions on the route.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in an NC automatic programming device.

[0002]

2. Description of the Related Art Form data of a workpiece in which a machining path on an upper surface and a machining path on a lower surface are different from each other is created and read, and the elements of the upper and lower machining paths are made to correspond to each other. An NC automatic programming device having a function of generating NC data for performing machining is already known, and is used for creating NC data of a wire electric discharge machine or a machine tool having five or more feed axes. .

[0003] The algorithm of the NC data generation function in this type of NC automatic programming device is conceptually described as follows.
This can be illustrated by the flowchart of FIG. Now, suppose that there is CAD data of a workpiece having the upper surface side processing path PT1 and the lower surface side processing path PT2 as shown in FIG.

[0004] Assuming that the NC data generation processing is executed on the shape data by a conventional NC automatic programming device, the NC automatic programming device firstly performs
The upper surface side processing path PT1 based on the initialized value of the index i
And the coordinate values of the machining start points P0, Q0 of the lower surface side machining path PT2, that is, the coordinate values of the starting point of the first element in each machining path, are read, and the starting point storage registers RPS, RQS are read.
(Step T1 to Step T3), and further increments the value of the index i by one to obtain the upper surface side processing path PT1.
And the coordinate values of the next points P1 and Q1 on the lower surface side processing path PT2, that is, the coordinate values of the end point of the first element in each processing path, are read, and the end point storage registers RPE,
It is stored in the RQE (step T4 to step T7).

[0005] Here, the NC automatic programming device obtains the movement amount of one element between the upper surface processing paths RPS and RPE and the movement amount of one element between the lower surface processing paths RQS and RQE. RP for upper side processing path PT1
A movement command is determined such that the wire or tool moves the lower surface side processing path PT2 from RQS to RQE while moving from S to RPE, and this movement command is additionally stored in the memory as a part of the processing program (step T8). -Step T10). Then, the NC automatic programming device uses the contents of the end point storage registers RPE and RQE at the present time as the start point of the next element in the upper surface side processing path PT1 and the lower surface side processing path PT2 as the start point storage registers RPS,
The data is updated and stored in the RQS to prepare for the calculation of the movement amount for the next element (step T11).

Hereinafter, until the processing for the machining end point which is the end point of the last element is completed, the value of the index i is successively increased and the same processing as described above is repeated. Each element constituting the upper surface side machining path PT1 and each element constituting the lower surface side machining path PT2 are, for example, the first element of the upper surface side machining path PT1 based on the machining start point. A first element of the lower surface side processing path PT2,
In addition, the second element of the upper surface processing path PT1 and the second element of the lower processing path PT2 are associated in a one-to-one relationship from the sequential end.

Therefore, it is good that the upper processing path PT1 and the lower processing path PT2 have a simple offset relationship as shown in FIG. 6, for example, as shown in FIG. A problem arises when it is desired to machine a plurality of elements of the lower surface side machining path in correspondence with one element of the machining path.

In the example of FIG. 7, three linear elements Qi to Qi + 1, Qi + 1 to Qi + 2, Qi + of the lower processing path are compared with one circular element Pi to Pi + 1 of the upper processing path. 2 to Qi + 3 are shown to be processed. Naturally, in such processing, a series of contours formed by a plurality of elements of the lower surface side processing path, for example, in FIG. It is necessary to smoothly interpolate between a polygonal line formed by three linear elements and one arc element of the upper surface side machining path for machining. However, the above-described algorithm is applied as it is to the NC automatic programming device for NC data. Is generated, one arc element Pi to Pi + 1 on the upper surface side machining path and one linear element Qi to Qi + 1 on the lower surface side machining path are paired, as shown by a dashed line in FIG. Because it corresponds to one, what the designer intended Therefore, a completely different workpiece is generated.

As described above, each element constituting the upper surface side machining path and each element constituting the lower surface side machining path are one-to-one from the end with respect to the machining start point. This is because they are associated with each other.

Further, the upper surface side machining path Pi to Pi + 1 should be machined between the element after the point Pi + 1 of the upper surface side machining path and the element after the point Qi + 1 of the lower side machining path. Since the two elements corresponding to the linear elements Qi + 1 to Qi + 2 and Qi + 2 to Qi + 3 are constantly shifted from each other, FIG.
In addition to the abnormal machining at the corners as indicated by the dashed line, the entire workpiece may be randomly chopped.

Therefore, in order to avoid such a problem, the side of one element to be made to correspond to a plurality of elements, that is, in the example of FIG. 7, the arc elements Pi to Pi + of the upper surface side processing path.
It is necessary to prevent the above-mentioned misalignment by dividing the first side into a plurality according to the number of elements of the corresponding lower surface side processing path. In short, in the example of FIG. 7, the shape data is corrected by inserting the two insertion points α and β into the path of the arc elements Pi to Pi + 1 and dividing the arc elements Pi to Pi + 1 into three sections. However, no special means has been provided so far for correcting the shape data in order to determine the position of the insertion point, and all arithmetic processing and correction work must be performed by the operator himself. However, there was a problem that work was troublesome.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to perform complicated arithmetic processing and shape processing even when processing is performed in such a manner that the elements of the upper and lower processing paths correspond one-to-many. An object of the present invention is to provide an NC automatic programming device which does not require an operator to perform data correction work and can easily generate NC data for contour processing.

[0013]

SUMMARY OF THE INVENTION According to the present invention, the upper and lower machining paths are created or read by creating or reading shape data of a workpiece having different upper and lower machining paths, and the upper and lower machining paths are made to correspond to each other. In an NC automatic programming device having a function of generating NC data for processing an outer peripheral portion while interpolating on an element-by-element basis, one element of an upper or lower machining path is arbitrarily selected and corresponded to the one element. Means for selecting a machining path of the side surface by a plurality of elements; means for dividing the one element into a plurality of elements by the number of the plurality of elements in correspondence with the length of the machining path of each element in the plurality of elements; The above object has been attained by a configuration characterized by comprising:

Means for arbitrarily selecting one element of the upper or lower processing path and selecting the processing path of the other surface corresponding to the one element by a plurality of elements; A similar object has been achieved by a configuration characterized by comprising means for equally dividing into a plurality of elements by the number of elements.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a block diagram showing a main part of an NC automatic programming device according to an embodiment to which the present invention is applied. 1 is a microprocessor (hereinafter referred to as a CPU), 6 is a ROM storing a start-up program of the NC automatic programming device, 8 is a hard disk storing various control programs and system programs, and 7 is an arithmetic and display process. A RAM temporarily stores data to be used, 9 is a disk drive unit used for reading processing shape data and processing programs stored in a floppy disk 10 and writing new data, 3 is a keyboard, 2 is a graphic, The display 4 is a mouse for moving a cursor, selecting an element, and the like. These elements are connected to the CPU 1 via a bus 5.

The NC automatic programming device is a CA
Various functions required for the D / CAM, for example, a shape input function for creating shape data of a machining shape by an input operation using the keyboard 3 and the mouse 4, a created machining shape, a designated tool, and the like. Cutting conditions, and
An automatic programming function for automatically creating a series of machining programs according to a specified machining order, etc. Also, tool paths and tools are created by automatically creating machining programs or performing simulation while running created machining programs. A drawing function for drawing a position and the like are provided similarly to the conventional NC automatic programming device, and a system program for realizing this function is stored in the hard disk 8. The selection of these various functions is performed using the mouse 4
By moving the cursor on the graphic display 2 with, the corresponding menu item is selected from the menu display.

FIG. 8 only shows components for realizing various functions required of the NC automatic programming device, and omits the description related to the drive control of the NC machine tool. .

FIG. 2 to FIG. 5 show the contours of the upper and lower machining paths created by the CAD function of the NC automatic programming device for a wire electric discharge machine or a machine tool having five or more feed axes. It is a flowchart which shows the outline of the edit processing in the case of performing processing by making the elements of a processing path correspond to one-to-many.

In the following, the contours of the upper and lower machining paths of the workpiece are set in advance in the same manner as in the prior art in advance of the CA of the NC automatic programming device.
An editing process unique to the present embodiment will be described assuming that the editing process is created by the D function. The outline of the machining path is assumed to be the same as that in FIG. 7, and the graphic display 2 has already displayed the upper and lower machining paths as shown in FIG.

This editing processing is used only when the processing is performed in such a way that the elements of the upper and lower processing paths are made to correspond one-to-many. If the operator does not select the execution of the editing processing after the creation of the shape data. That is, when the determination result of step S1 in FIG. 2 is false, the conventional processing shown in FIG. 1 is directly performed on the shape data created at this stage, and the upper surface side processing path is formed. One by one
One element and one element constituting the lower surface side processing path are associated in a one-to-one relationship from the end with reference to the processing start point, and the outer peripheral part is processed while interpolating the upper and lower processing paths in element units. Is automatically generated.

On the other hand, when it is necessary to perform the processing by associating the elements of the upper and lower processing paths with one-to-many, the operator first operates the edit execution key to cause the CPU 1 to execute step S2.
The subsequent processing will be executed.

The CPU 1 that has started the editing process first
A message to the effect that one element is selected from the outline on the side for selecting one element (in this embodiment, the upper outline) is displayed on the graphic display 2 (step S).
2) The apparatus enters a standby state waiting for a mouse click operation by the operator (step S3). Then, the operator carries out a selection operation by clicking the mouse, and the operator selects one from the upper contour.
When one element is selected, the CPU 1 determines the start point (Uj, Vj) and the end point (Uj + 1, Vj + 1) of one element of the upper machining path closest to the position where the mouse click is performed.
(Step S4), and the coordinates of each point are stored in the start point storage register RPS and the end point storage register RPE (step S5). In the example of FIG. 7, one of the upper processing paths corresponding to a plurality of elements of the lower processing path. Pi ~
Since the element of Pi + 1 is selected, the coordinate value of (Ui, Vi) in FIG.
The end point storage register RPE has (Ui + 1,
The coordinate value of (Vi + 1) is stored.

Next, the CPU 1 executes the upper surface side machining path RP
The movement amount (stroke) for one element between S and RPE is obtained (step S6), and the value is stored in the movement amount storage register S (step S7), which corresponds to one element of the selected contour (upper contour). A message to select a plurality of elements of the other contour (lower contour) to be made is displayed on the graphic display 2 (step S8), and the index m and the value of the integrated value storage register $ Sm are initialized to zero (step S8). S
9, step S10) or whether the operator selects a lower contour element by clicking the mouse (step S1).
1) Or, it enters a standby state waiting for the operator to operate the selection end key (step S12).

Here, when the operator performs a mouse click operation in the same manner as described above to select one element of the lower contour, the CPU 1 increments the value of the index m by one and updates the value of the number of element selections ( Step S14), the starting point (Xk, Yk) and the ending point (Xk + 1, Yk) of one element of the lower machining path closest to the position where the mouse click is performed
+1) (step S15), and the coordinates of each point are stored in the start point storage register RQS (m) and the end point storage register RQ.
E (m) is stored (step S16), the movement amount of one element between the lower surface side machining paths RQS (m) to RQE (m) is obtained (step S17), and the value is stored in the movement amount storage register S ( m) (step S18), and the value of the movement amount S (m) is added and stored in the integrated value storage register $ Sm (step S19).

Thereafter, every time the operator performs a mouse click operation to select one element of the lower contour, the processing of steps S14 to S19 is repeatedly executed in the same manner as described above.

In the example of FIG. 7, the elements of the lower contour that should correspond to one element of the upper contour are Qi to Qi + 1 and Qi + 1 to Qi.
Since there are three elements of i + 2 and Qi + 2 to Qi + 3, the above-described processing of steps S14 to S19 is executed three times in total. It is not necessary to select the elements in the order of Qi to Qi + 1, Qi + 1 to Qi + 2, Qi + 2 to Qi + 3 along the path from the machining start point. For example, Qi + 1 to Qi +2
, Qi to Qi + 1 and Qi + 2 to Qi + 3 in the order of Qi + 2 to Qi + 3.
+3, Qi to Qi + 1, Qi + 1 to Qi + 2, and the order of the selection operation does not matter as long as these three elements are selected.

Since the description is being made with reference to the example of FIG. 7, the number of elements to be selected is three. In practice, if the number is two or more, several elements are selected. Is also good.

As a result, the movement amount storage register S (m) stores the movement amount of one element of the lower contour selected by the m-th click operation, and the start point storage register RQS
(M) and the end point storage register RQE (m) store the start point and end point of one element of the lower contour selected by the m-th click operation. Naturally, the values stored in the integrated value storage register $ Sm are the moving amount of one element selected at the first time, the moving amount of one element selected at the second time,..., The m-th time. The total sum of the movement amounts of the other elements is stored.

When the operator who has selected all the elements of the lower contour to be made to correspond to one element of the upper contour operates the selection end key, the CPU 1 initializes the value of the index n to 1 (step S13). ), The coordinate value of the start point of one element of the n-th selected lower contour is read from the start point storage register RQS (n) (step S2).
0), the value of the index r is initialized to 1 (step S21),
The coordinate value of the ending point of one element of the r-th selected lower contour is read from the ending point storage register RQE (r) (step S22), and it is determined whether or not both coincide (step S23). Naturally, since the start point and the end point of the same element do not coincide, the first determination result in step S23 (in short, when n = r = 1) is necessarily false.

Then, the CPU 1 increments the value of the index r by 1 (step S24), and sets the value to the number m of element selections.
Is determined (step S2).
5). If the value of r does not exceed the number m of element selections, the CPU 1 sets the coordinate value of the end point of one element of the r-th lower contour again based on the updated value of the index r as the end point. It is read from the storage register RQE (r) (step S22), and it is determined whether or not the value matches the coordinate value RQS (n) of the start point of one element of the n-th lower contour (step S23). ).

Here, the coordinate value RQS (n) of the start point of one element of the lower contour selected at the nth position is changed to the coordinate value RQE (r) of the end point of one element of the lower contour selected at the rth position. ), It is found that one element of the n-th selected lower contour is not the selected element located at the first position on the path from the machining start point.
Is incremented by 1 (step S26), and the coordinate value RQS (n) of the start point of one element of the lower contour selected nth again is read based on the updated value of the index n (step S20). Whether or not one element of the n-th selected lower contour can be the selected element located at the first position on the path from the machining start point is determined by the loop processing of steps S21 to S25 as described above. Is determined.

As a result, the selected element that is the first selected element on the path from the machining start point is a selected element having start point coordinates that do not match the end point coordinates of any selected element, that is, step S25. Is a selection element for which the result of determination is true. Naturally, this selection element is also the selection element selected in the n-th selection operation.

In the example of FIG. 7, the end point of the selection elements Qi to Qi + 1 is Qi + 1, the end point of the selection elements Qi + 1 to Qi + 2 is Qi + 2, and the end point of the selection elements Qi + 2 to Qi + 3 is Since Qi + 3, the selected element Qi having a starting point different from any of these end points
.About.Qi + 1 are selection elements located at the first position on the path from the machining start point.

In this way, the CPU 1 which has detected the selected element located at the first position on the path from the machining start point
Is to initialize the value of the index w to 1 (step S2
7) The moving amount corresponding to one selected element located at the w-th position on the path from the machining start point, that is, the selected element selected by the n-th selecting operation is stored in the moving amount storage register S.
(N) is read (step S28), and the sum of the movement amount S (n) of the selected element with respect to the sum of the movement amounts of all the selected elements, that is, the value of the integrated value storage register $ Sm, is calculated. Is stored in the register Z (w) (step S29).

Therefore, in the example of FIG. 7, the selected elements Qi to Qi + 1 located at the first position on the path from the machining start point.
Is the sum of the movement amounts of all the selected elements in the lower contour ΣS
The ratio of the movement amount to the value of m is determined by the register Z (1)
Will be stored.

Next, the CPU 1 calculates the coordinate value of one selected element located at the w-th position on the path from the machining start point, that is, the coordinate value of the end point corresponding to the selected element selected by the n-th selection operation. While reading from the storage register RQE (n) (step S30), the value of the index r is initialized to 1 again (step S31), and the coordinate value of the starting point corresponding to one element of the r-th lower contour is determined. Start point storage register R
Reading from QS (r) (step S32), it is determined whether or not both match (step S33). If they do not match, the value of the index r is incremented by 1 (step S34), and the start point corresponding to one element of the r-th lower contour is selected again based on the updated value of the index r. The coordinate values are read from the starting point storage register RQS (r) (step S32), and the values are stored in one element of the n-th selected lower wheel, that is, the w-th position on the path from the machining start point. It is determined whether or not the coordinate value is equal to the coordinate value RQE (n) of the end point of one element of the lower contour located at (step S33).

As long as the number m of selection of the elements of the lower contour is 2 or more, a selection having a start point that matches the coordinate value of the end point of one selected element located at the first position on the path from the processing start point. Since the element always exists in the selected m lower contour elements, at least when w = 1,
While repeatedly executing the processing of steps S32 to S34, the determination result of step S33 always becomes true.

Therefore, the selected element located at the w-th position on the path from the machining start point, that is, the starting point R coincident with the coordinate value of the end point of the n-th selected lower contour element
CPU 1 that has detected a lower contour element having QS (r)
Increments the value of the index w by 1 (step S3
5) The movement amount corresponding to the selection element located at the w-th position on the path from the machining start point, that is, the movement amount corresponding to the selection element selected by the r-th selection operation is stored in the movement amount storage register S.
(R) is read (step S36), the ratio of the moving amount S (r) of the selected element to the sum of the moving amounts of all the selected elements in the lower contour ΣSm is determined, and the ratio is stored in the register Z. (W) (Step S3)
7).

In the example of FIG. 7, the selected element located at the first position on the path from the machining start point, that is, the selected element with w = 1 is Qi to Qi + 1, and the coordinate value coincides with its end point. Lower contour elements Qi + 1 to Qi + having Qi + 1 as a starting point
2 is detected in the processing of steps S32 to S34. Thereafter, the value of the index w is immediately incremented by one. As a result, the selected elements Qi + 1 to Qi + 2 are recognized as the second selected elements on the path from the machining start point, and the register Z (2) includes selected elements Qi + 1 to Qi + 2 located at the second position on the path from the machining start point.
The ratio of the movement amount of the selected element to the sum ΣSm of the movement amounts of all the selected elements in the lower contour is stored.

Next, the CPU 1 determines whether or not the value of the index w has reached the value of the number m of element selections, that is, the ratio of the moving amount to the sum of the moving amounts for each of the m selected elements. It is determined whether or not all the processes for calculating are performed (step S38). Then, if there is still a selected element for which the ratio of the movement amount has not been determined and the value of the index w has not reached the value of m, the CPU 1 replaces the value of the index r with the value of the index n (step S39). The coordinate value corresponding to the end point of the selected element selected by the n-th selection operation, in other words, the end point of one selected element located at the w-th position on the path from the machining start point is read from the end point storage register RQE (n). (Step S30) Hereinafter, the same processing as described above is repeatedly executed to select the next selected element on the downstream side of the machining path following the selected element located at the w-th position on the path from the machining start point. The value of the corresponding index r is specified (steps S31 to S34), the value of the index w is incremented by 1 (step S35), and the next one located at the w-th position on the path from the processing start point is determined. Select element Reads the amount of movement of response from the movement distance storage register S (r) (step S36), the movement amount S of the one selected element
The ratio that (r) occupies in the value of the sum ΣSm of the movement amounts of all the selected elements in the lower contour is obtained, and the ratio is stored in the register Z (w) (step S37).

In the example of FIG. 7, the selected elements located at the second position on the path from the machining start point, that is, the selected elements with w = 2 are Qi + 1 to Qi + 2, and coincide with the end point. The lower contour elements Qi + 2 to Qi having the coordinate values Qi + 2
i + 3 is detected in the processing of steps S32 to S34, and thereafter, the value of the index w is immediately incremented by one. As a result, the selected elements Qi + 2 to Qi + 3 are on the path from the machining start point. Is recognized as the selected element located at the third position, and the register Z (3) stores the selected element Qi + 2 at the third position on the path from the machining start point.
The ratio of the movement amount of Qi + 3 to the value of the sum ΣSm of the movement amounts of all the selected elements in the lower contour is stored.

Here, the explanation is being made with reference to the case of FIG. 7 in which there are three selection elements, so that when w = 3, the determination result of step S38 becomes false and step S3
Although the loop processing from step S0 to step S38 and step S39 ends, as described above, in practice, any number of elements may be selected as long as there are two or more elements. Regardless, w = 1 and w = 1, in order from the side of the selected element located on the upstream side on the path from the machining start point.
The ratio of the moving amount of one selected element located at each w-th position of 2, w = 3,... To the total sum of the moving amounts of all the selected elements in the lower contour is calculated. The data is sequentially stored in the register Z (w). Of course,
If the value of the number m of selected elements is 4, three times, if the value of the number m of selected elements is 5, four times,...
The loop processing of steps S38 and S39 is repeated.

Therefore, as described above, it is necessary for the operator to select each element of the lower contour to be made to correspond to one element of the upper contour by clicking the mouse in advance in order along the machining path from the upstream side. Not at all.

Finally, each of the ratios of all the w = 1 to m-th selected elements on the path from the machining start point to the sum of the movement amounts of all the selected elements in the lower contour Is obtained, and when the determination result of step S38 is false, the CPU 1 initializes the value of the index r again to 1 (step S40), and initializes the value of the ratio integrated value storage register ΣZw to 0 (step S41). The ratio value Z (r) corresponding to one selected element located at the r-th position on the path from the machining start point is read (step S42), and is added and stored in the ratio integrated value storage register ΣZw (step S42).
43), machining paths RPS to RP, which are selection elements on the upper surface side
On the movement trajectory between E and RPS,
The coordinates [U (r), V (r)] of the movement position where the ratio of the movement amount to the movement amount between S and RPE is ΣZw are obtained, and data of the end point and the start point of one element are inserted into the position. Then, the trajectory between RPS and RPE is divided (step S44).

The coordinates [U (r), V (r)] of the movement position are the value of ΣZw and the movement amount S between the machining paths RPS to RPE.
And the trajectory equation.

At the stage of r = 1, the value of the ratio integrated value storage register $ Zw has been initialized to 0, and the register Z (r)
Stores the ratio of one selected element Qi to Qi + 1 on the lower surface located at the first position on the path from the machining start point. Therefore, in the example of FIG. 7, the selected elements Qi to Qi + 1, in proportion to the ratio of the selected elements Qi to Qi + 1 to the sum of the path lengths of the selected elements Qi + 1 to Qi + 2 and the selected elements Qi + 2 to Qi + 3, for example, a point in FIG. α coordinate value [U
(1), V (1)] are inserted as division points on the movement trajectory between the machining paths RPS to RPE.

Next, the CPU 1 increments the value of the index r by 1 (step S45), and determines whether or not the value of the index r is smaller than the value of the element selection number m (step S45).
46), if the value of the index r is smaller than the value of the element selection number m, the CPU 1 returns to the r-th position on the path from the machining start point based on the updated value of the index r. The ratio value Z (r) corresponding to the selected element is read (step S42), added and stored in the ratio integrated value storage register ΣZw (step S43), and the movement trajectory between the machining paths RPS to RPE as the upper-side selected element In the above, starting from the RPS, the coordinates [U (r), V] of the movement position at which the ratio of the movement amount to the movement amount between the RPS and the RPE is ΣZw
(R)] is obtained, and data of the end point and the start point of one element is inserted at that position to further divide the trajectory between RPS and RPE (step S44).

At the stage of r = 2, the selected elements Qi to Qi + 1 are added to the sum of the path lengths of the selected elements Qi to Qi + 1, Qi + 1 to Qi + 2, and Qi + 2 to Qi + 3. The ratio occupied in the integrated value storage register に Zw is already stored in the integrated value storage register ΣZw, and the lower surface side located at the second position on the path from the machining start point stored in the register Z (r) 7 is added and stored, so in the example of FIG. 7, the selected elements Qi to Qi + 1, the selected elements Qi + 1 to Qi + 1 are selected.
In proportion to the ratio of the sum of the selection elements Qi to Qi + 1 and Qi + 1 to Qi + 2 to the sum of the path lengths of Qi + 2 and selection elements Qi + 2 to Qi + 3, for example, FIG. The coordinate value [U (2), V (2)] of the point β is newly inserted as a division point on the movement locus between the machining paths RPS to RPE.

Finally, if r = m and all the ratios of the selected elements on the lower surface side are added, the value of ΣZw is necessarily 1 and the moving position calculated in the process of step S44 Of the coordinates [U (m), V (m)] coincides with the end point coordinates RPE of the machining paths RPS to RPE, so that the processing of steps S42 to S44 is actually performed and [U (m) ), V (m)]. In this embodiment, considering this point, step S46 is performed.
Is determined as r <m, and the arithmetic processing when r = m is not executed.

By the above processing, the ratio of the first lower-side selected element on the path from the machining start point to the total movement amount of the lower-side selected element, the position at the second position Ratio of the lower-side selection element to the total movement amount of the lower-side selection element to be moved,..., The lower-side selection element located at the m-th (last) position is the movement amount of the lower-side selection element In proportion to each of the ratios to the sum of the coordinate values [U (1), V (1)], [U (2), V
(2)],..., [U (m-1), V (m-1)] at a ratio of Z (1): Z (2):. become.

The subsequent processing is exactly the same as that of the conventional example shown in FIG. 1, in which each element constituting the upper surface processing path and each element constituting the lower surface processing path is a processing start point. NC data for performing machining of the outer peripheral portion while interpolating the upper and lower machining paths in units of elements in order from the end with reference to the end is automatically generated. Since the selection element side on the top side, which is originally single, is divided into multiple parts according to the selected number of selection elements, the correspondence between the upper and lower machining paths is always kept in an appropriate state at each position It becomes possible to create NC data for processing the outer peripheral portion while interpolating the upper and lower processing paths.

That is, the point α [U (1), V in FIG.
(1)] and the point β [U (2), V (2)] are the (i + 1) th coordinate value counted from the machining start point in the processing of FIG.
That is, it is treated as the (i + 2) th coordinate value, and the end point Pi + 1 of the selected element of the upper surface processing path before the editing process is treated as the (i + 1 + 2) th coordinate value. In short, if the number of selected elements is m, the end point Pi + 1 of the selected element on the upper surface side machining path before the editing process is treated as the (m-1) + 1-th coordinate value. Means that the value of (m-1) is 2.

As described above, as one embodiment, a case is described in which the elements of the upper processing path are divided in proportion to the proportions of the lengths of the elements of the lower processing path corresponding to one element of the upper processing path. As described above, if NC data for rough machining is to be generated, it is not always necessary to maintain a strict proportional relationship, and one element of the machining path on the upper surface is simply selected as an element of the machining path on the lower surface. It may be equally divided by the number.

If such processing is performed, steps S1 to S9 and steps S11 to S1 are performed.
2, Step S14, Step S40 to Step S41
And only the processing of steps S43 to S46 may be performed. However, in this case, it is necessary to perform an arithmetic process of Z (r) ← 1 / m as a process replacing step S42. Of course, it is not necessary to repeat the same operation, so the return destination from step S46 may be between the operation of Z (r) ← 1 / m and the process of step S43.

In short, the number m of selected elements of the machining path on the lower surface is grasped, and [m-1] number of steps of the moving amount of S / m are set on the moving trajectory between the selected elements RPS to RPE on the upper surface. It just inserts the division point of.

In this case, smooth machining is not always performed. However, since at least the number of machining elements on the upper and lower surfaces can be made coincident with each other, as shown by a dashed line in FIG. Only abnormal processing can be reliably prevented.

[0057]

According to the present invention, one element of the upper or lower machining path is arbitrarily selected, and a plurality of elements of the machining path on the other surface to be machined are selected in accordance with the selection. Then, the automatic programming device automatically divides the one element and redefines the correspondence between the upper and lower machining paths, so that the operator does not have to perform any troublesome arithmetic processing or shape data correction work. It is possible to easily generate NC data for processing the outer peripheral contour in a case where the correspondence relationship is one-to-many.

[Brief description of the drawings]

FIG. 1 is a flowchart conceptually showing an algorithm of an NC data generation function in an NC automatic programming device.

FIG. 2 is a flowchart illustrating an outline of an editing process according to an embodiment of the present invention.

FIG. 3 is a continuation of a flowchart showing an outline of an editing process.

FIG. 4 is a continuation of the flowchart showing an outline of the editing process.

FIG. 5 is a continuation of the flowchart showing the outline of the editing process.

FIG. 6 is a conceptual diagram showing correspondence between elements in a case where elements of an upper surface processing path and elements of a lower surface processing path of a workpiece have a simple one-to-one relationship.

FIG. 7 is a conceptual diagram showing correspondence between elements when it is necessary to process a plurality of elements on a lower surface processing path in correspondence with one element on an upper surface processing path.

FIG. 8 is a block diagram showing an NC automatic programming device according to an embodiment of the present invention.

[Explanation of symbols]

 1 CPU 2 Graphic display 3 Keyboard 4 Mouse 5 Bus 6 ROM 7 RAM 8 Hard disk 9 Disk drive unit 10 Floppy disk

Claims (2)

[Claims] 1. A method for creating or reading shape data of a workpiece in which a machining path on the upper surface and a machining path on the lower surface are different from each other to correspond elements of the upper and lower machining paths, and interpolate the upper and lower machining paths in units of elements to form a peripheral portion. An NC automatic programming device having a function of generating NC data for performing machining of a plurality of machining paths on the other side, wherein one element of an upper or lower machining path is arbitrarily selected and the other side corresponds to the one element. Means for selecting one of the elements, and means for dividing the one element into a plurality of elements by the number of the plurality of elements in accordance with the length of a machining path of each element in the plurality of elements. NC automatic programming device. 2. A method for creating or reading workpiece shape data in which a machining path on the upper surface and a machining path on the lower surface are different from each other to correspond the elements of the upper and lower machining paths, and interpolate the upper and lower machining paths in element units to form an outer peripheral portion. An NC automatic programming device having a function of generating NC data for performing machining of a plurality of machining paths on the other side, wherein one element of an upper or lower machining path is arbitrarily selected and the other side corresponds to the one element. NC automatic programming apparatus, comprising: means for selecting the number of elements; and means for equally dividing the one element into a plurality of elements by the number of the plurality of elements.