JP2568171B2 - Numerical control device with numerical control data correction function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> A plurality of numerical control data groups for repeatedly moving a tool along a plurality of movement paths similar to the contour of a workpiece are stored, and the plurality of numerical control data groups are stored. The present invention relates to a numerical control device for processing the workpiece by sequentially reading the data and controlling the movement of the tool.

<Prior Art> For example, when milling the outer diameter of the workpiece W as shown in FIG. 1 (a), the contour of the workpiece W in the XY plane is measured, and the contour is measured based on the measured shape. 1
The movement locus of the tool as shown in FIG. 6B is calculated, and the numerical control data is created based on this. Then, thereafter, the outer peripheral surface Wa of the workpiece W is machined by controlling the machine tool according to the generated numerical control data. In such processing, as shown in FIG. 1 (b),
A plurality of moving paths P1 to Pn similar to the shape of the workpiece W are calculated, and numerical control data corresponding to each of these moving paths P1 to Pn are created.

In such a numerical control machining system, since the shape of the machining surface Wa is measured in the XY plane to generate numerical control data, the movement paths P1 to Pn of the tool T are also the Z axis orthogonal to the XY plane. There is no movement in any direction, and as shown in FIG. 1 (a), the machining surface of the workpiece W to be machined.
If there is a part A where part of Wa is curved in the Z-axis direction,
In this portion A, the machined surface Wa may not be machined normally, or the holder holding the tool T may interfere with the workpiece W.

Therefore, in the past, before actually performing the machining,
By reading the numerical control data block by block and executing it, the movement trajectory of the tool is confirmed, and if there is a portion where the position in the Z-axis direction changes as described above, the tool T moves in the Z-axis direction at this position. I had to modify the numerical control data so that it would move to.

<Problems to be Solved by the Invention> However, in the conventional one, there is no function of collectively correcting a plurality of numerical control data groups corresponding to a plurality of movement paths P1 to Pn, so that a plurality of movements can be made. Path P1
There is a problem that it is necessary to manually correct the numerical control data for each of the plurality of numerical control data groups corresponding to each of Pn to Pn, and it takes a lot of time to correct the numerical control data.

<Means for Solving Problems> The present invention relates to a numerical control data group storage means for storing a plurality of numerical control data groups, a manual moving means for manually moving a tool, and the numerical control data group. Correction movement path storage means for storing a correction movement path of the tool performed by combining movements by manual operation of the manual movement means during movement by one of the numerical control data of The corrected movement path stored by the means and the numerical control data of the moving path stored in the numerical control data group storage means are compared to determine the position range corrected by the manual operation. Deviation amount calculating means for obtaining a deviation amount between the block of numerical control data for moving the specified position range and the block of numerical control data stored in the numerical control data group storage means of the moving path during movement And the starting point of the position range on which the tool movement correction should be performed for each of a plurality of other moving paths from the starting point of the position range on which the tool is manually moved on the moving path, Numerical control data correction means for determining each corresponding block of numerical control data and correcting each block of the numerical control data with the shift amount obtained by the shift amount calculating means to bias the movement locus for correction. It is characterized by that.

<Operation> When the moving path is corrected by using the manual moving means during the movement by one of the plurality of numerical data groups stored in the numerical control data group storing means, the corrected moving path is stored as the corrected moving path storage. The moving range stored in the means and compared with the moving path of the corrected moving path storage means and the moving path of the numerical control data being moved to determine the position range moved by the manual moving means in the moving path of the numerical control data group. The amount of deviation between the block of numerical control data for moving within the determined position range and the block of numerical control data for the moving path of the moving path being moved is calculated.

Then, from the start point of the position range in which the tool is moved by manual operation, the start point of the position range in which the movement of the tool for each of the other plurality of movement paths should be corrected is obtained, and each numerical control corresponding to this position range is obtained. Each block of data is determined, and each block of the numerical control data is corrected by the shift amount obtained by the shift amount calculating means to shift the moving locus to correct it.

Therefore, the operator can correct all the numerical control data groups by correcting the moving route by the manual moving means during the movement by one of the plurality of numerical control data groups, and the numerical control data can be corrected. It can be done in an extremely short time.

<Examples> Examples of the present invention will be described below with reference to the drawings. Second
In the figure, reference numeral 10 is a machine tool for processing the workpiece W by three-dimensional relative movement between a table 12 on which the workpiece W is placed and a spindle head 11 on which a tool T is mounted. A servo motor (not shown) is connected to the numerical controller main body 15. The main body 15 of the numerical control device is connected to the central computer 17 via the interfaces 14 and 16, and controls the movement of the machine tool 10 according to the numerical control data sent from the central computer 17. An operation panel 18 is connected to the interface 14,
The operation panel 18 is provided with push button switches 18a and 18b for instructing the start and end of the playback operation.

The numerical control device body 15 performs pulse distribution based on numerical control data sent from the central computer 17,
Also, in parallel with this pulse distribution, the contents of the current position counter 20 provided inside the numerical controller 15 are updated, and the relative position between the workpiece W and the tool T is detected by the contents of the current position counter 20. I am able to do it. A manual pulse generator 21 is connected to the numerical controller body 15, and when the handle 21a of the manual pulse generator 21 is operated, the numerical controller body 15 recognizes this by an interrupt and The manual pulse generation process shown in the figure is performed. This manual pulse generation process distributes a positive or negative pulse in the designated axial direction according to the rotation direction of the handle 21a, and then updates the current position counter 20. Further, the numerical controller main body 15 has a function of outputting the contents of the current position counter 20 to the outside, and the central computer 17 determines the workpiece W and the tool T based on the data output from the numerical controller main body 15. The relative position between and can be recognized.

On the other hand, the central computer 17 controls the machining surface of the workpiece W.
From the contour data of Wa, as shown by the solid line in FIG. 1 (b), a plurality of movement paths P1 to Pn similar to the shape of the machining surface Wa are calculated, and numerical control corresponding to the plurality of movement paths P1 to Pn is performed. A process of creating the data groups NCD1 to NCDn and storing them in the disk device 17a, and the created NC data are stored in the numerical controller main body 15
Workpiece W based on numerical control data created by transferring to W
In addition to having the function of performing the processing and processing, the numerical control data created is partially corrected.

Hereinafter, the correction processing of the numerical control data by the central computer 17 will be described. When numerical control data is automatically created according to the shape data of the machining surface Wa of the workpiece W,
The operator presses the playback start button 18a provided on the operation panel 18 to instruct the central computer 17 to start the playback operation.

In response to this, the central computer 17 starts the processing shown in FIG. The central computer 17 is a disk device 17a
The numerical control data stored in the is transferred to the numerical control device main body 15 side in units of a predetermined block, and the numerical control device main body is transferred.
Start 15 playback operations, then interface
The central computer 17 reads the current position data output from the numerical controller 15 every time the numerical controller 15 executes a block of numerical control data by giving a command to
Transfer to the side. The central computer 17 sequentially stores the transferred current position data in the disk device 17a in association with the block number of the executed numerical program.

The playback process as described above is applied to the movement route of the first lap.
Perform until the tool T has moved along P1. When the tool T moves to the portion A of the workpiece W that is curved in the Z-axis direction during the playback operation, the operator operates the handle 21a of the manual pulse generator 21, and the numerical controller main body 1
The position is corrected so that the tool T also moves in the Z-axis direction along the machining surface Wa by giving an interrupt to 5. As a result, the tool T
Is a manual pulse generator 21 for moving the tool T in the Z-axis direction based on the pulse distribution based on the numerical control data sent from the central computer 17 corresponding to the movement path P1 of the first round.
Both of the pulse distribution based on the command from the tool T are performed, whereby the tool T moves along the moving locus that combines the two, and the content of the current position counter 20 also changes according to the actual position change of the tool T. Therefore, the movement path P1 ′ of the tool T position-corrected by the manual pulse generator 21 by reading the current position data output from the numerical control device body 15 every time the numerical control data is executed for one block.
Can be recognized.

When the playback operation of the first movement path P1 is completed in this way, the operator operates the playback end button 18b on the operation panel. In response to this, the central computer 17 performs the processing for modifying the numerical control data shown in FIG. First, the central computer 17 first calculates the position change data corresponding to the movement path P1 of the first lap by simulating the numerical control data group NCD1, and the movement data corrected by the playback process. Path P1 ′
The position data is compared with the position data of No. to determine the movement route correction start position shown as SP in FIG. Then, the moving direction of the tool T at this point is stored, and the relational expression representing the normal line L parallel to the XY plane passing through the correction start position SP and orthogonal to the moving path P1 of the first turn is calculated and stored. . Then, after this, the correction amounts ΔZ1 to ΔZn of the locus at points after the movement locus correction start position SP are derived for each block by calculating the difference between the original movement route P1 and the corrected movement route P1 ′. Then, it is stored in the correction amount table CPT shown in FIG.

When such preparation process is completed, the central computer
17 sequentially reads a plurality of numerical control data groups NCD1 to NCDn corresponding to a plurality of movement paths P1 to Pn in 1 block units, and calculates the position change of the tool T by simulating the read NC data, During execution of the sled block, it is determined whether or not the normal line L is passed, and if it is passed, whether the moving direction of the tool T is the same as the moving direction of the tool T at the locus correction start position SP. If it is determined that both conditions are satisfied, the numerical control data subsequent thereto is sequentially corrected block by block according to the correction amount stored in the correction amount table CPT.

Such processing is performed by a plurality of numerical control data groups NCD1 to NCDn.
By doing the same for the numerical control data group NCD2 corresponding to the moving paths P2 to Pn on the second and subsequent laps by the same amount as the correction amount of the numerical control data performed on the moving path P1 on the first lap.
~ NCDn is also corrected, and in the portion A where the machining surface Wa is deviated in the Z-axis direction, the movement of the tool T after the second revolution is also deviated in the Z-axis direction along this, Even after that, the machined surface Wa can be machined accurately.

The above embodiment is an embodiment in which the numerical control data is corrected on the side of the central computer 17, but such processing may be performed inside the numerical control device body 15.

<Effects of the Invention> As described above, according to the present invention, while moving one of the plurality of numerical data groups corresponding to the plurality of moving routes, the moving route can be corrected by a manual operation. Since a large number of numerical control data groups corresponding to the movement routes of are also modified, there is an advantage that the numerical control data can be modified easily and in a short time.

[Brief description of drawings]

1 (a) is a perspective view of a workpiece W to be machined, FIG. 1 (b) is a view showing a movement path of a tool T in FIG. 1 (a), and FIGS. 2 to 7 (b). 2 shows an embodiment of the present invention. FIG. 2 is a block diagram showing the overall configuration of a numerical control machining system, and FIG. 3 is a numerical control device main body in FIG.
15 is a flowchart showing the manual pulse generation processing, FIGS. 4 and 5 are flowcharts showing the operation of the central computer 17 in FIG. 2, FIG. 6 is a partially enlarged view of the movement path of the tool T, and FIG. ) Is the disk device 17 in FIG.
The figure which shows the memory state of numerical control data in a, the 7th
FIG. 6B is a diagram showing the correction amount table CPT. 10 …… Machine tool, 15 …… Numerical control unit, 17 …… Central computer, 20 …… Current position counter, T …… Tool,
W ... Workpiece.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiromi Araki, No. 1 Toyota-cho, Toyota-shi, Toyota-shi Toyota Motor Co., Ltd. 52-106563 (JP, A) JP 59-139407 (JP, A) JP 58-225408 (JP, A) JP 58-187270 (JP, A) JP 59-95608 (JP, A) A) JP-A-55-44644 (JP, A)

Claims (1)

(57) [Claims] 1. A plurality of numerical control data groups for repeatedly moving a tool along a plurality of movement paths similar to the contour of a workpiece are stored, and the plurality of numerical control data groups are sequentially read to control the movement of the tool. In the numerical control device for processing the workpiece by doing, a numerical control data group storage means for storing the plurality of numerical control data group, a manual moving means for moving the tool by a manual operation, Corrected movement path storage means for storing a corrected movement path of the tool performed by combining movements by manual operation of the manual movement means during movement by one of the numerical control data of the numerical control data group, The corrected moving path stored in the corrected moving path storage means is compared with the numerical control data of the moving path being moved stored in the numerical control data group storage means, and is corrected by the manual operation. The amount of deviation between the block of numerical control data for determining the determined position range and moving the determined position range and the block of numerical control data stored in the numerical control data group storage means of the moving route during the movement. And a deviation amount calculating means for obtaining a deviation amount calculation means, and a starting point of a position range on which a tool movement correction is to be performed for each of a plurality of other moving paths from a starting point of a position range on which a tool is manually moved. Numerical control for determining each block of numerical control data corresponding to the position range, correcting each block of the numerical control data with the shift amount calculated by the shift amount calculating means, and biasing the movement trajectory to correct A numerical control device having a numerical control data correction function, which is provided with data correction means.