JP3545547B2 - NC automatic programming device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in an NC automatic programming device.
[0002]
[Prior art]
An NC that creates or reads the shape data of a workpiece in which the machining path on the upper surface and the machining path on the lower surface are different and associates the elements of the upper and lower machining paths with each other, and performs processing of the outer peripheral portion while interpolating the upper and lower machining paths in element units. An NC automatic programming device having a function of generating data is already known, and is used for generating 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 can be conceptually shown by the flowchart of FIG. Now, it is assumed 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 performed on the shape data by the conventional NC automatic programming device, the NC automatic programming device first determines the upper surface side machining path PT1 and the lower surface machining path PT1 based on the initialized index i. The coordinate values of the machining start points P0 and Q0 of the side machining path PT2, that is, the coordinate values of the start point of the first element in each machining path are read and stored in the start point storage registers RPS and RQS (steps T1 to T3). Further, the value of the index i is incremented by one, and the coordinate values of the next points P1 and Q1 in the upper surface processing path PT1 and the lower surface processing path PT2, that is, the coordinate values of the end point of the first element in each processing path are calculated. It is read and stored in the end point storage registers RPE and RQE (steps T4 to T7).
[0005]
Here, the NC automatic programming device obtains the movement amount of one element between the upper surface processing paths RPS to RPE and the movement amount of one element between the lower surface processing paths RQS to RQE, and the wire or tool is used for the upper surface processing. While moving the path PT1 from the RPS to the RPE, a movement command is determined such that the wire or tool moves the lower surface processing path PT2 from the RQS to the RQE, and the movement command is additionally stored in the memory as a part of the processing program. (Step T8 to Step T10). Then, the NC automatic programming device updates and stores the contents of the end point storage registers RPE and RQE at the present time in the start point storage registers RPS and RQS as the start point of the next element in the upper surface processing path PT1 and the lower surface processing path PT2. Prepare for calculating the movement amount for one element (step T11).
[0006]
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 forming the processing path PT1 and each element forming the lower processing path PT2 are, for example, the first element of the upper processing path PT1 and the lower processing on the basis of the processing start point. The first element of the path PT2, the second element of the upper surface processing path PT1, the second element of the lower processing path PT2,... Become.
[0007]
Therefore, the upper surface side processing path PT1 and the lower side side processing path PT2 may have a simple offset relationship as shown in FIG. 6, but for example, as shown in FIG. A problem arises when it is desired to process a plurality of elements on the lower surface side processing path in correspondence with one element.
[0008]
In the example of FIG. 7, three linear elements Qi to Qi + 1, Qi + 1 to Qi + 2, and Qi + 2 to Qi of the lower processing path are compared with one arc element Pi to Pi + 1 of the upper processing path. FIG. 7 shows a case where machining is to be performed in correspondence with +3. Naturally, in such machining, a series of contours formed by a plurality of elements of the lower surface side machining path, for example, three straight lines in FIG. It is necessary to smoothly interpolate between the polygonal line formed by the elements and one arc element of the upper surface side processing path, but processing is performed as it is by applying the above-described algorithm to the NC automatic programming device to generate NC data. Is executed, 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 correspond one-to-one, as indicated by a chain line in FIG. Is completely different from what the designer intended. This results in the generation of a workpiece.
[0009]
This is because, as described above, each element constituting the upper surface side machining path and each element constituting the lower surface side machining path are in a one-to-one relationship in order from the end with respect to the machining start point. This is because they are associated.
[0010]
Further, a straight line element Qi to be machined together with the upper surface machining paths Pi to Pi + 1 between the element after the point Pi + 1 of the upper surface machining path and the element after the point Qi + 1 of the lower surface machining path. Correspondence deviations corresponding to two elements corresponding to +1 to Qi + 2 and Qi + 2 to Qi + 3 are constantly generated, so that not only abnormal corner processing as shown by a chain line in FIG. Instead, it can mean that the entire workpiece is randomly chopped.
[0011]
Therefore, in order to avoid such a problem, the side of one element that should correspond to a plurality of elements, that is, the side of the arc elements Pi to Pi + 1 of the upper surface side processing path in the example of FIG. It is necessary to prevent the above-described misalignment by dividing into a plurality according to the number of elements of the corresponding lower surface processing path. In short, in the example of FIG. 7, the shape data is corrected by inserting two insertion points α and β on 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 it took time to work.
[0012]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and even when processing is performed by associating elements of upper and lower processing paths in a one-to-many manner, the operator himself / herself performs cumbersome arithmetic processing and shape data correction work. An object of the present invention is to provide an NC automatic programming device that can easily generate NC data for contour processing without any need.
[0013]
[Means for Solving the Problems]
The present invention Processed With the machining path on the top Processed Create or read the shape data of a workpiece with a machining path different from that of the lower surface, make the elements of the upper and lower machining paths correspond, and interpolate the upper and lower machining paths in element units. Raka In an NC automatic programming device having a function of generating NC data for performing machining, one element of an upper or lower machining path is arbitrarily selected and a plurality of machining paths of a surface on the other side corresponding to the one element are selected. Means for selecting by an element, 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. Has achieved the above object.
[0014]
A means for arbitrarily selecting one element of the upper or lower processing path and selecting a processing path of the other surface corresponding to the one element by a plurality of elements; A similar feature is achieved by a configuration characterized by comprising means for equally dividing the number into a plurality.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described 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, etc., and 7 is a process in a calculation and display process. A RAM for temporarily storing data to be used, a disk drive unit 9 for reading processing shape data and processing programs stored in the floppy disk 10 and writing new data, a keyboard 3, a keyboard 2, and a graphic 2 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.
[0016]
This NC automatic programming device has various functions required for CAD / CAM, for example, a shape input function for creating shape data of a machining shape by an input operation using a keyboard 3 and a mouse 4, and a created machining process. Automatic programming function for automatically creating a series of machining programs according to the shape, designated tools and cutting conditions, and the designated machining order, etc. A drawing function for drawing a tool path and a tool position by performing a simulation while running the program is provided similarly to a conventional NC automatic programming device. A system program for realizing this is stored in the hard disk 8. Selection of these various functions is performed by moving the cursor on the graphic display 2 with the mouse 4 and selecting the corresponding menu item from the menu display.
[0017]
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.
[0018]
2 to 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 an element correspond in one-to-many.
[0019]
Hereinafter, the editing process unique to the present embodiment will be described assuming that the contours of the upper and lower machining paths of the workpiece are created in advance by the CAD function of the NC automatic programming device in the same manner as in the related art. The outline of the processing path is assumed to be the same as that in FIG. 7, and the graphic display 2 has already displayed the upper and lower processing paths as shown in FIG. 7.
[0020]
This editing process is used only when processing is performed by making the elements of the upper and lower processing paths correspond one-to-many, and when the operator does not select the execution of the editing process after creating the shape data, If the determination result of step S1 in FIG. 2 is false, the conventional processing shown in FIG. 1 is performed on the shape data created at this stage without any change, and one by one constituting the upper surface side processing path is obtained. One element and one element constituting the lower surface side machining path are associated with each other in a one-to-one relationship from the end based on the machining start point, and machining of the outer peripheral portion is performed while interpolating the upper and lower machining paths in element units. Is automatically generated.
[0021]
On the other hand, when it is necessary to perform the processing by making the elements of the upper and lower processing paths correspond to one-to-many, first, the operator operates the edit execution key to cause the CPU 1 to execute the processing after step S2.
[0022]
First, the CPU 1 that has started the editing processing displays a message on the graphic display 2 to select one element from the outline on the side for selecting one element (in this embodiment, the upper outline) (step S1). S2), and enters a standby state waiting for a mouse click operation by the operator (step S3). Then, when the operator performs a selection operation by mouse click and selects one element from the upper contour, the CPU 1 determines the start point (Uj, Vj) of one element of the upper processing path closest to the position where the mouse click is performed. And its end point (Uj + 1, Vj + 1) are identified (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, the elements Pi to Pi + 1 are selected as one element of the upper machining path corresponding to a plurality of elements of the lower machining path, and as a result, (Ui) of FIG. , Vi), and the coordinate value of (Ui + 1, Vi + 1) in FIG. 7 is stored in the end point storage register RPE.
[0023]
Next, the CPU 1 obtains the movement amount (stroke) for one element between the upper surface side processing paths RPS and RPE (step S6), stores the value in the movement amount storage register S (step S7), and selects the selected contour ( A message indicating that a plurality of elements of the other contour (lower contour) to be made to correspond to one element of the upper contour (lower contour) is displayed on the graphic display 2 (step S8), and the index m and the integrated value storage register $ Sm are displayed. The value is initialized to zero (steps S9 and S10), and the operator selects a lower contour element by mouse click (step S11) or enters a standby state waiting for the operator to operate a selection end key. Enter (step S12).
[0024]
Here, when the operator performs a mouse click operation 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 element selection number (step S14). The start point (Xk, Yk) and the end point (Xk + 1, Yk + 1) of one element of the lower machining path closest to the position where the mouse click is performed are identified (step S15), and the coordinates of each point are stored in the start point storage register. RQS (m) and the end point storage register RQE (m) are stored (step S16), and the movement amount of one element between the lower surface side processing paths RQS (m) to RQE (m) is obtained (step S17). 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).
[0025]
Thereafter, each time the operator performs a mouse click operation to select one element of the lower contour, the processes of steps S14 to S19 are repeatedly executed in the same manner as described above.
[0026]
In the example of FIG. 7, the elements of the lower contour that should correspond to one element of the upper contour are the three elements Qi to Qi + 1, Qi + 1 to Qi + 2, and Qi + 2 to Qi + 3. The processing of steps S14 to S19 is performed 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, Qi + 2 to Qi + 3, or Qi + 2 to Qi + 3, Qi to Qi + 1, Qi + 1 to Qi + 2, and these three elements are The order of the selection operation does not matter as long as it is selected.
[0027]
Here, since the description is being made with reference to the example of FIG. 7, the number of elements to be selected is three, but in practice, any number of elements may be selected as long as the number is two or more.
[0028]
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) stores the start point and end point of one element of the lower contour selected by the m-th click operation. Naturally, the value stored in the integrated value storage register $ Sm is the moving amount of one element selected in the first time, the moving amount of one element selected in the second time,..., The m-th time. Further, the total sum of the movement amounts of one element is stored.
[0029]
Then, 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 lower contour is read from the start point storage register RQS (n) (step S20), the value of the index r is initialized to 1 (step S21), and the r-th index is set. Is read from the end point storage register RQE (r) (step S22), and it is determined whether or not they match (step S23). Naturally, since the start point and the end point of the same element do not match, the first determination result in step S23 (in short, when n = r = 1) is necessarily false.
[0030]
Therefore, the CPU 1 increments the value of the index r by one (step S24), and determines whether or not the value exceeds the value of the number m of element selections (step S25). If the value of r does not exceed the number m of element selections, the CPU 1 returns 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 to 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). ).
[0031]
Here, the coordinate value RQS (n) of the start point of one element of the n-th lower contour coincides with the coordinate value RQE (r) of the end point of one element of the r-th lower contour. Then, 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, and the CPU 1 sets the value of the index n to The value is incremented by one (step S26), and the coordinate value RQS (n) of the start point of one element of the n-th lower contour selected again based on the updated value of the index n is read (step S20). Whether or not one element of the second lower contour selected 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. .
[0032]
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 any end point coordinates of any selected element, that is, the determination result of step S25. Is a true selection element. Naturally, this selection element is also the selection element selected in the n-th selection operation.
[0033]
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 Qi + 3. Therefore, the selection elements Qi to Qi + 1 having start points different from any of these end points are the selection elements located at the first position on the path from the machining start point.
[0034]
After detecting the selected element located at the first position on the path from the processing start point in this way, the CPU 1 initializes the value of the index w to 1 (step S27), and then on the path from the processing start point. Then, the movement amount corresponding to one selected element located at the w-th position, that is, the movement amount corresponding to the selection element selected by the n-th selection operation is read from the movement amount storage register S (n) (step S28), and the selection is performed. The sum of the movement amounts of the elements S (n) with respect to the value of the integrated value storage register $ Sm is calculated, and the ratio is stored in the register Z (w) (step S29). ).
[0035]
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 are determined by the sum of the movement amounts ΣSm of all the selected elements in the lower contour. The ratio of the occupied moving amount is stored in the register Z (1).
[0036]
Next, the CPU 1 stores the coordinate value of one selected element located at the w-th position on the path from the processing start point, that is, the coordinate value of the end point corresponding to the selected element selected by the n-th selection operation in the end point 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 start point corresponding to one element of the r-th selected lower contour is stored in the start point storage register. RQS (r) is read (step S32), and it is determined whether or not both match (step S33). If the two 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 start 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).
[0037]
As long as the selected number m of the elements of the lower contour is 2 or more, the selected element having the 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 is: Since w is always present in the selected m lower contour elements, at least in the case of w = 1, the determination result of step S33 is always true while the processing of steps S32 to S34 is repeatedly performed. It becomes.
[0038]
Therefore, a selection element positioned at the w-th position on the path from the machining start point, that is, a start point RQS (r) that matches the coordinate value of the end point of the n-th selected lower contour element is provided. Upon detecting the lower side contour element, the CPU 1 increments the value of the index w by 1 (step S35), and selects the selection element located at the w-th position on the path from the processing start point, that is, the r-th selection operation. Is read from the movement amount storage register S (r) (step S36), and the movement amount S (r) of the selected element is equal to the movement amount of all the selected elements in the lower contour. The ratio occupying the value of the sum ΣSm is obtained, and the ratio is stored in the register Z (w) (step S37).
[0039]
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 Qi + 1 coincides with the end point. Are detected as the starting points in the processes 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 In (2), the moving amount of the selected elements Qi + 1 to Qi + 2 located at the second position on the path from the machining start point is the sum of the moving amounts ΣSm of the moving amounts of all the selected elements in the lower contour. The ratio to the value is stored.
[0040]
Next, the CPU 1 calculates whether or not the value of the index w has reached the value of the number m of element selections, in other words, for each of the m selected elements, calculates the ratio of the movement amount to the total movement amount. It is determined whether or not all of the processes for this have been performed (step S38). 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). From the end point storage register RQE (n), the coordinate value corresponding to the end point of the selected element selected by the n-th selection operation, that is, the end point of one selected element located at the w-th position on the path from the machining start point is read. (Step S30) Hereinafter, the same processing as described above is repeatedly executed to select the next selected element downstream 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 The corresponding movement amount is read from the movement amount storage register S (r) (step S36), and the movement amount S (r) of one selected element is determined based on the sum of the movement amounts of all the selected elements in the lower contour ΣSm. Is obtained, and the obtained ratio is stored in the register Z (w) (step S37).
[0041]
In the example of FIG. 7, the selected element 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 the coordinate values coincide with the end point thereof. The lower contour elements Qi + 2 to Qi + 3 having Qi + 2 as a starting point are detected in the processes of steps S32 to S34, and thereafter, the value of the index w is immediately incremented by one. The elements Qi + 2 to Qi + 3 are recognized as the selected elements located at the third position on the path from the machining start point, and the register Z (3) stores the third element on the path from the machining start point. The ratio of the amount of movement of the selected elements Qi + 2 to Qi + 3 located at the position of the sum of the amounts of movement of all the selected elements in the lower contour ΣSm is stored.
[0042]
Here, since the description is being made with reference to the case of FIG. 7 in which there are three selection elements, the determination result of step S38 becomes false when w = 3, and the loop of steps S30 to S38 and step S39 is performed. Although the process is completed, as described above, any number of elements may be selected as long as there are actually two or more elements. As a result, regardless of the selection order of the selected elements, the path from the machining start point is determined. The moving amount of one selected element located at the w-th position of w = 1, w = 2, w = 3,. Of the selected element with respect to the total amount of movement of the selected element is obtained, and the value is sequentially stored in the register Z (w). Naturally, 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,... It is.
[0043]
Therefore, as described above, there is no necessity for the operator to select in advance the elements of the lower contour to be made to correspond to one element of the upper contour by clicking the mouse in order from the upstream side in advance along the machining path. .
[0044]
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. When the determination result of step S38 is false, the CPU 1 initializes the value of the index r to 1 again (step S40), initializes the value of the ratio integrated value storage register ΣZw to 0 (step S41), and sets the machining start point. The value Z (r) of the ratio corresponding to one selected element located at the r-th position on the route from is read (step S42), and added and stored in the ratio integrated value storage register ΣZw (step S43). On the movement path between the machining paths RPS and RPE, which is a selection element of, the coordinates of the movement position [U (r), where the ratio of the movement amount to the movement amount between RPS and RPE becomes ΣZw, starting from RPS. Seeking (r)], by inserting the data of the point where the end point and start point of an element in its position, divides the trajectory between RPS～RPE (step S44).
[0045]
The coordinates [U (r), V (r)] of the movement position can be calculated from the value of ΣZw, the movement amount S between the machining paths RPS to RPE, and the trajectory equation.
[0046]
At the stage of r = 1, the value of the ratio integrated value storage register ΣZw is initialized to 0, and the register Z (r) stores one of the lower surface side located at the first position on the path from the machining start point. Since the ratio of the selection elements Qi to Qi + 1 is stored, in the example of FIG. 7, the selection elements Qi to Qi + 1, the selection elements Qi + 1 to Qi + 2, and the selection elements Qi + 2 to Qi + 3 For example, the coordinate value [U (1), V (1)] of the point α in FIG. 7 is proportional to the ratio of the selection elements Qi to Qi + 1 to the sum of the path lengths, and is calculated between the processing paths RPS to RPE. Is inserted as a division point on the movement trajectory.
[0047]
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 number m of element selections (step S46). If the value is smaller than the value of the number m, the CPU 1 again determines, based on the updated value of the index r, the value Z () of the ratio corresponding to one selected element located at the r-th position on the path from the machining start point. r) is read (step S42), added and stored in the ratio integrated value storage register ΣZw (step S43), and on the movement trajectory between the machining paths RPS and RPE, which are the selection elements on the upper surface side, the RPS is set as the starting point and the RPS and The coordinates [U (r), V (r)] of the movement position where the ratio of the movement amount to the movement amount between the RPEs is ΣZw are obtained, and data of the end point and the start point of one element are inserted into the position. , RPS ~ The trajectory between the RPEs is further divided (step S44).
[0048]
At the stage of r = 2, the selection elements Qi to Qi + 1 occupy the sum of the path lengths of the selection elements Qi to Qi + 1, the selection elements Qi + 1 to Qi + 2, and the selection elements Qi + 2 to Qi + 3. The ratio is already stored in the integrated value storage register $ Zw, and this value is further selected from the lower surface side located at the second position on the path from the machining start point stored in the register Z (r). Since the element ratios are added and stored, in the example of FIG. 7, the path lengths of the selected elements Qi to Qi + 1, the selected elements Qi + 1 to Qi + 2, and the selected elements Qi + 2 to Qi + 3 are determined. In proportion to the ratio of the sum of the selected elements Qi to Qi + 1 and Qi + 1 to Qi + 2 to the total sum, for example, the coordinate value [U (2), V (2)] of the point β in FIG. Is newly inserted as a division point on the movement trajectory between the processing paths RPS to RPE.
[0049]
Eventually, if r = m and all the proportions of the selected elements on the lower surface side are added, the value of ΣZw is necessarily 1 and the coordinates of the movement position calculated in the process of step S44 [ 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, in consideration of this point, the determination criterion in step S46 is set to r <m, and the arithmetic processing when r = m is not executed.
[0050]
By the above-described 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 lower-side side located at the second position Ratio of the selected element to the total movement amount of the lower-side selection element,..., The lower-side selection element located at the m-th (last) position is the sum of the movement amounts of the lower-side selection element. In proportion to each of the ratios occupied, the moving trajectory between the selection elements RPS to RPE on the upper surface side has coordinate values [U (1), V (1)], [U (2), V (2)], .., [U (m-1), V (m-1)], the data is divided at a ratio of Z (1): Z (2):...: Z (m).
[0051]
Subsequent processing is exactly the same as 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 are based on the processing start point. NC data for machining the outer peripheral portion is automatically generated while interpolating the upper and lower machining paths in element units in order from the end in a one-to-one relationship. The upper side of the selection element, which is originally single, is divided into multiple parts according to the number of selections, so that the correspondence between the upper and lower processing paths is always kept in an appropriate state at each position and the upper and lower processing It becomes possible to create NC data for processing the outer peripheral portion while interpolating the path.
[0052]
That is, in the process of FIG. 1, the point α [U (1), V (1)] and the point β [U (2), V (2)] in FIG. Are treated as the i-th coordinate value and the (i + 2) -th coordinate value, and the end point Pi + 1 of the selected element of the upper surface side machining 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.
[0053]
As described above, as one embodiment, a case has been described in which the elements of the upper processing path are divided in proportion to the length ratio of the elements of the lower processing path corresponding to one element of the upper processing path. However, 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 equalized by the number of elements selected for the machining path on the lower surface. It may be divided into.
[0054]
If such processing is performed, only the processing of steps S1 to S9, steps S11 to S12, step S14, steps S40 to S41, and 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.
[0055]
In short, the number m of the selected elements of the machining path on the lower surface is grasped, and [m-1] division points on the locus of movement between the selected elements RPS to RPE on the upper surface with a step size of the moving amount of S / m. It just inserts.
[0056]
In this case, smooth machining is not always performed, but since at least the number of machining elements on the upper and lower surfaces can be matched, abnormal machining as indicated by a chain line in FIG. Only what is done can be reliably prevented.
[0057]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, one element of the upper or lower machining path is arbitrarily selected, and the automatic programming device is selected only by selecting a plurality of elements of the machining path on the other surface to be machined in accordance with this. Automatically divides the one element and redefines the correspondence between the upper and lower machining paths, so that the correspondence between the upper and lower elements is one-to-many even if the operator does not have to perform cumbersome arithmetic processing or work to correct the shape data. In such a case, NC data for processing the outer peripheral contour can be easily generated.
[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 a flowchart showing an outline of an editing process.
FIG. 5 is a continuation of the flowchart showing the outline of the editing process.
FIG. 6 is a conceptual diagram showing the correspondence between elements when the elements on the upper surface processing path and the elements on the lower surface processing path of the workpiece have a simple one-to-one relationship.
FIG. 7 is a conceptual diagram showing correspondence between elements when it is necessary to machine 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)

Create or read the shape data of the workpiece where the machining path on the upper surface of the workpiece and the machining path on the lower surface of the workpiece are different, associate the elements of the upper and lower machining paths, and interpolate the upper and lower machining paths in element units. in NC automatic programming apparatus having a function of generating NC data for performing Luo pressurized Engineering,
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 with a plurality of elements;
Means for dividing the one element into a plurality of parts by the number of the plurality of elements in accordance with the machining path length of each element in the plurality of elements. Create or read the shape data of the workpiece where the machining path on the upper surface of the workpiece and the machining path on the lower surface of the workpiece are different, associate the elements of the upper and lower machining paths, and interpolate the upper and lower machining paths in element units. in NC automatic programming apparatus having a function of generating NC data for performing Luo pressurized Engineering,
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 with a plurality of elements;
Means for equally dividing the one element into a plurality of elements by the number of the plurality of elements.

Images