JPH07152421A - Nc data producing device - Google Patents

Abstract

PURPOSE:To provide an NC data producing device capable of automatically producing the NC data at and after the position where the machining is interrupted. CONSTITUTION:An operator designates the sequence number of a path where a cutting job is started. The data on the cutter location (CL) point is calculated for each path where the machining is carried out (steps 41 and 42). Then the shift extents preceding the designated sequence number are added up based on the CL point data. The shift extent of the XY direction is converted into the NC data among those shift extents added up (step 52). Meanwhile the shift extent of the Z direction is also converted into the NC data (step 53). Furthermore the CL point data given from the path of the designated sequence number is converted into the cutting NC data (step 44).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC data creating device, and more particularly to an NC data creating device which creates an NC data by adding a sequence number to each processing pass.

[0002]

2. Description of the Related Art An NC data creating device for mold processing is
There is a type in which a sequence number is added to each pass to create NC data. In this NC data creation device,
When processing a die having a hemispherical convex portion on a flat plate shape as shown in FIG. 8, from the first pass Pa-Pb for starting cutting to the second pass Pc-Pd, the third pass. Path Pe-
The NC data is created in the order of Pf and the fourth pass Pg-Ph, and the NC data up to the final pass Pn-Pm at the cutting end position is created collectively. Then, the machine tool that processes the die based on the NC data created by this NC data creation device uses tools as a first path Pa-Pb, a second path Pc-Pd, and a third path Pe-P.
The feed processing is performed in the order of f and the fourth pass Pg-Ph.
During the cutting, the sequence number of the path being cut is displayed on the display device, for example, the fourth path Pg-
While the point Pk on Ph is being processed, the sequence number "4" of the pass is displayed. Then, when the machining is stopped due to a power failure or deterioration of the tool, the display device is set to continue to indicate the sequence number of the path in which the machining is interrupted.

[0003]

As described above, the machine tool is designed to indicate the sequence number of the pass that was being machined when machining was interrupted, but the NC data that interrupted machining was used. Is not designed to keep track of how far the order has been advanced. That is, NC for die processing for a long time (for example, 10 to 24 hours)
This is because the amount of data is enormous, and setting the memory capacity so as to hold all of these causes a cost problem. In particular, in the case of interruption due to tool deterioration instead of interruption due to power failure, etc., the interruption position is known if the interruption position is not held because the tool is moved away from the machining interruption position of the workpiece for replacement. It is difficult to restart processing from the interrupted position. Therefore, in order to perform the machining again, either the machining is performed from the beginning on the basis of the NC data, or the NC data is corrected to restart the machining according to the sequence number of the path at the interrupted position. It became necessary.

However, when machining (tool feeding) is performed based on the NC data including a portion which has already been machined, it takes a long time of 10 to 24 hours to mold, and therefore, for example, If a power failure occurs at the time when 5 hours of processing that requires 20 hours have elapsed, a new 20
It takes time to process. In particular, in the case of interruption due to deterioration of the tool, the tool is often spoiled immediately before the completion of processing, so it is necessary to replace the tool at the 18th or 19th hour of the 20-hour processing. Starting from, 18 hours or 19 hours was sent meaninglessly, resulting in a very wasteful time. On the other hand, as described above, since the NC data creating device can create the NC data only at once, it is necessary for the operator to manually make the NC data when recreating (correcting) the NC data. This NC data is recreated by deleting the NC data up to the point immediately before the point where the machining was interrupted. However, since the NC data for die machining is configured for three-dimensional machining, which NC code is used? It is very difficult to determine whether the instruction corresponds to the interrupted point, and it takes a long time to perform this determination. Further, since it is difficult to determine, mistakes are likely to occur, and for example, there has been a situation in which NC data is deleted even in an unprocessed portion and a desired shape cannot be processed. Further, when the NC data is deleted as described above, NC data for sending the tool to the vicinity of the interrupted point (slightly narrow with a margin) must be created (indication of non-cutting area), The creation of this NC data is a very troublesome work because it is necessary to calculate the amount of movement by the deleted NC data.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an NC data creating apparatus capable of automatically creating NC data from a position where machining is interrupted.

[0006]

In order to solve the above-mentioned problems, the present invention is an NC data creating device for creating NC data by giving a sequence number for each pass for machining, in which a path for cutting is started. Sequence number designating means 1 for designating a sequence number and the moving amount in the XY directions before the sequence number designated by the sequence number designating means 1 are integrated to create NC data for moving in the XY directions. NC data for Z movement for creating NC data for Z-direction movement by accumulating NC data for Z-direction movement by integrating the XY movement NC data creation means 2 and the amount of movement in the Z direction prior to the sequence number designated by the sequence number designating means 1. It comprises a data creating means 3 and a cutting NC data creating means 4 for creating cutting NC data from the sequence number designated by the sequence number designating means 1. And wherein the door.

[0007]

In the NC data creating apparatus having the above structure, the sequence number designating means 1 causes the operator to designate the sequence number of the path for starting cutting. In response to this, the XY movement NC data creating means 2 integrates the movement amounts in the XY directions before the designated sequence number to obtain X.
NC data for moving in the Y direction is created, and the NC data creating means for Z moving 3 integrates the moving amount in the Z direction before the designated sequence number, and NC for moving in the Z direction.
Create the data. Then, the cutting NC data creation means 4 creates the cutting NC data from the designated sequence number. In this way, NC data for starting cutting from the path of the sequence number designated by the operator is automatically created.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 shows a computer 12 according to this embodiment.
FIG. 3 shows an NC data creation device 10 including
3 shows a flowchart of NC data creation processing by the data creation device 10. Here, first, NC data for processing a shape similar to the example given in the description of the related art, that is, a die shape in which a hemispherical convex portion is provided on a flat plate shape is created. The case will be described.

First, the operator inputs data or the like to the NC data creating apparatus 10 via the keyboard 16 in order to specify the die shape. As a result, in the NC data creation device 10, the judgment step 31 becomes Yes and the step 32
Then, the process proceeds to the process (1) to create a wire frame shape based on the data of the mold shape in which the hemispherical convex portions are provided on the input flat plate shape. Next, in step 33, a three-dimensional curved surface shape formed from the wire frame shape is created (a curved surface is created on the linear wire frame shape), and the created curved surface shape is displayed on the display device 14. To do. In response to this, the operator gives an instruction to combine a plurality of curved surfaces via the keyboard 16. As a result, the NC data creation device 10 determines the decision step 3
4 becomes Yes and the process proceeds to step 35, and in response to the operator's designation of a combination for a plurality of curved surfaces, a compound curved surface for creating one set of NC data is defined. Here, a flat plate shape and a hemispherical convex portion are defined. However, when a plurality of curved surfaces are combined, the plurality of curved surfaces are defined according to an instruction from the operator.
The shape is specified by the processing up to step 35.

Next, the operator inputs cutting conditions such as the shape and diameter of the tool, the feed speed of the tool, the rotational speed of the tool, etc. to the NC data creating device 10 via the keyboard 16. In response to this, the NC data creation device 10 defines Yes in the determination step 36 and defines the cutting condition input in step 37. Next, in step 38, the interference check of the tool, that is, whether the tool interferes with the hemispherical convex portion when cutting the inputted flat plate shape, and the hemispherical convex portion is cut. Check whether the tool interferes with the flat plate shape when the tool is in motion, and create an offset curved surface for preparation of NC data creation, that is, create a curved surface offset by the radius of the tool to actually advance the machining. . Then, in the next step 39, as will be described in detail later, NC data for processing the created shape under specified cutting conditions is created. Finally, in step 40, the NC data creation device 10 stores the created NC data in the storage device 18 and completes all processing.

The creation of NC data in step 39 will be described in more detail with reference to the flow chart of FIG. 4 and the explanatory view of FIG. First, referring to the flowchart of FIG. 4, in step 41, the NC data creation device 10 determines the cutter location point (CL point) with the locus of sending the tool for cutting the first pass Pa-Pb shown in FIG. 5 as a point. ) Calculate the data. The calculation of the cut location is based on the curved surface data created in step 38 to extract the point cloud so that the trajectory of the tool is within a predetermined tolerance value. The first pass Pa-P
In the case of b, since it is a straight line, the CL point is the cutting start point P
There are only two points, a and the cutting end point Pb of the first pass. Next, in the judgment step 42, it is judged whether or not the CL point has been calculated up to the final pass. Here, the first pass Pa-
Since the CL point data of Pb has just been calculated, determination step 42 becomes No and the process returns to step 41 to calculate the CL point for the next second path Pc-Pd. Since the CL point in the case of this second pass Pc-Pd includes an arc portion in the middle of the pass, in order to keep the tool locus of this arc portion within the tolerance value described above, subdivision such as Pcn, Pcn + 1, etc. It becomes a group including the converted points. And CL for this 1 pass
By repeating the calculation of the point cloud data, the final pass Pn
When the CL point is calculated up to −Pm, the judgment step 42 returns Y.
es, and the process proceeds to the next judgment step 43. In the judgment step 43, it is judged whether or not there is a designation of a start sequence number for creating NC data described later. Since the start sequence number is not specified here,
The determination step 43 becomes No and the process proceeds to step 44.

In step 44, the above-mentioned first pass Pa
While adding the sequence number "1" to -Pb, the CL point data for the first pass Pa-Pb is converted into an NC code.
Next, in a determination step 45, it is determined whether or not the data conversion up to the final pass is completed. Here, the first pass Pa-
Since the NC code of Pb has just been created, the determination step 45 becomes No and the process returns to step 44 to convert the next second path Pc-Pd into NC data. By repeating this process, CL is executed up to the final path Pn-Pm.
When the conversion from the point data to the NC data is completed, the decision step 45 becomes Yes and the process proceeds to step 46. In step 46, NC data for moving fast from the machining start position, that is, the tool initial position P to a point Pa ′ on the cutting start point Pa of the first pass Pa-Pb is created. The above processing completes the creation of NC data. FIG. 7 shows a part of the created NC data. The first 10-70,
Reference numeral 500 is a line number, and 01 and 04 attached to the line numbers 50 and 500 are sequence numbers. And
In this case, each data is commanded as an incremental value.

Next, the cutting of the workpiece (die) by the machine tool based on the NC data created above will be described. When NC data is transferred from the NC data creation device 10 and a cutting start is instructed by the operator, the machine tool (not shown) first follows the instruction of the NC data and then from the initial position P of the tool shown in FIG. The tool is fast-forwarded to the machining start position on the cutting start point Pa of the first pass. When the cutting start point Pa is further approached in the Z direction, processing is started from the cutting start point Pa of the first pass Pa-Pb, and processing is completed up to the point Pb of the first pass Pa-Pb.
Let the tool escape from the point Pb to the point Pb 'on the Z-axis, and XY
The workpiece is moved on the axis to a point Pc ′ corresponding to the machining start position of the second pass Pc-Pd, and the tool is approached on the Z axis to the cutting start point Pc of the second pass Pc-Pb. Cutting of two passes Pc-Pb is started. This X, Y,
By repeating the movement on the Z-axis, machining is advanced for each pass. Note that, here, the description will be continued assuming that the point Pk on the fourth pass Pg-Ph interrupts the machining due to a power failure during the machining. Due to the interruption of machining due to this power failure, the machine tool displays the sequence number "4" on a display device (not shown) to identify the interrupted path.

In this way, when the machining of the workpiece is interrupted, the fourth pass P by the NC data creating apparatus 10 of the present embodiment.
Creation of NC data for starting processing from g-Ph will be described with reference to the flowcharts of FIGS. 3 and 4 and the explanatory view of FIG. 5 again.

The operator instructs the NC data creating apparatus 10 to create NC data in order to deal with the interruption of the machining of the machine tool. At this time, N described above with reference to FIG.
Since the input of the curved surface shape, the definition of the complex curved surface, and the definition of the cutting conditions are completed when the C data is created, the NC data creation device 10 of the present embodiment uses these instructions as they are to create the NC data. It shall be created. For this reason,
Here, description of steps 31 to 35 in the flowchart of FIG. 3 is omitted. The operator designates the cutting start position, and therefore the fourth pass Pg-Ph is set as the cutting condition.
Enter the sequence number “4”. As a result, NC
The data creation device 10 defines Yes in the determination step 36 and defines the cutting conditions input in step 37. Next, in step 38, tool interference check and offset curved surface creation are performed. Then, in the next step 39, as will be described in detail later, NC data for processing the created shape under specified cutting conditions is created. Finally, in step 40, the NC data creation device 10 stores the created NC data in the storage device 18 and completes all processing.

Here, the creation of NC data from the fourth path Pg-Ph in step 39 will be described in detail with reference to the flowchart of FIG. 4 and the explanatory view of FIG. First, referring to the flowchart of FIG. 4, step 4
1, the NC data creation device 10 is the same as that shown in FIG.
Cutter location point (C
L point) Calculate the data. Then, in the judgment step 42, it is judged whether the CL point has been calculated up to the final pass, and the calculation of the CL point data for one pass is repeated to calculate the CL point up to the final pass Pn-Pm. This allows
The determination step 42 becomes Yes, and the next determination step 4
Go to 3. In the judgment step 43, it is judged whether or not there is a designation of a sequence number for starting the creation of NC data. Here, since "4" is designated as the start sequence number, the judgment step 43 becomes Yes and the process shifts to step 47.

In step 47, the number n of the path to be processed is initialized to 1 and the first path Pa-Pb is processed, and the process proceeds to step 48. In step 48, FIG.
The amount of movement to the processing start position Pa ′ shown in is calculated. Then, the movement amount is calculated by X, Y, Z indicating each CL point.
5, the amount of movement is obtained by adding and subtracting the data at each point according to the movement directions indicated by + and − signs on each axis in FIG.
Go to. In decision step 49, the path number n to be processed
(1) determines whether or not it is the start sequence number d (4). Here, the determination is No, and the process proceeds to step 50.

In step 50, the first pass P to be processed
From the CL point data of a-Pb, the amount of movement of the integrated amount from the processing start position is calculated. That is, the machining start position P shown in FIG.
The amount of movement on the X, Y, and Z axes from a'to the machining start point Pc 'of the next pass (second pass Pc-Pd) is calculated, and this is calculated from the tool initial position P to the machining start position Pa'. Is added to the movement amount of. Then, the process proceeds to step 51, in which 1 is added to the processing target path number n, and the processing target is set to the second path Pc-P.
Change to d. The sequence number “2” of the second path Pc-Pd is not the start sequence number d (4) either, so the determination step 49 becomes No and the process returns to step 50. In the step 50, the processing start point P of the second pass Pc-Pd
The amount of movement on the X, Y, and Z axes from c'to the machining start point Pe 'of the next pass (third pass Pe-Pf) is calculated, and this is calculated for the first pass Pa-Pb. The amount and the amount of movement from the tool initial position P to the machining start position Pa ′ are integrated. Then, the process proceeds to step 51, the path to be processed is changed to the third path Pe-Pf, and the above-mentioned processing is performed on the third path Pe-P.
f, and the processing start point P of the fourth pass Pg-Ph
Add up the movement amount up to g '. Accordingly, from the tool initial position P shown in FIG. 5, the machining start point P of the fourth pass Pg-Ph is obtained.
The amount of movement on the X, Y, and Z axes up to g'is obtained.

When the integration process of the third path Pe-Pf in step 50 is completed, the process proceeds to step 51, 1 is added to the process target path number n, and the process target path is the fourth path P.
Change to g-Ph. The determination in the determination step 49 is YES here because the processing target path number n (4) is equal to the processing start sequence number d (4).
Therefore, the process proceeds to step 52.

In step 52, the movement amount accumulated in step 50 (from the tool initial position P to the fourth pass Pg-P
(Amount of movement on the X, Y, Z axes up to the machining start point Pg 'of h)
Is the amount of movement in the XY directions from the tool initial position P to NC
Convert to data. Then, in step 53, the movement amount accumulated in step 50 (from the tool initial position P to the fourth
The movement amount in the Z direction from the tool initial position P is converted into NC data for the movement amounts on the X, Y, and Z axes up to the machining start point Pg ′ of the path Pg-Ph (here, in the figure When performing the processing shown in FIG. 5, the processing start position Pa ′ and the fourth pass Pg
Since the height of -Ph on the Z axis is different from the machining start point Pg ', a value corresponding to the difference in height is obtained as the movement amount in the Z direction). After this, the process proceeds to step 44.

In step 44, the above-mentioned fourth pass Pg is used.
While adding the sequence number "4" from -Ph, the CL point data for the fourth pass Pg-Ph is converted into an NC code. Next, in the judgment step 45, it is judged whether or not the data conversion is completed up to the final pass.
-Since the conversion of Ph to NC code has just started,
The determination step 45 becomes No, and the process returns to step 44 to convert the next fifth path Pi-Pj into an NC code. By repeating this process, the final pass Pn
When the conversion to the NC code is completed up to -Pm, the judgment step 45 becomes Yes and the routine proceeds to step 46. In step 46, the XY moving NC data obtained in step 52 and the Z moving NC data obtained in step 53 are converted into NC codes. That is, an NC code that moves fast to the machining start position (point Pg ′ of the fourth pass Pg-Ph) at this time is created. At this time, the NC data creating device first feeds the XY axes at a fast feed to a position corresponding to the machining start position Pg '(positioning of the workpiece), and then fast feeds the Z axis to a machining start position Pg'. , NC code is created so as to start cutting after approaching the cutting start position Pg. With the above processing, the NC data creation processing is completed.

Here, restart of cutting of a workpiece (die) by a machine tool based on the NC data created above will be described with reference to FIG. 6 showing a tool locus. When NC data is transferred from the NC data creation device 10 and a cutting restart is instructed by the operator, the machine tool (not shown) first follows the command of the NC data, and firstly, the machining start position (fourth operation) shown in FIG. XY to the position on the point Pg ′ of the path Pg-Ph
Fast-forward the workpiece on the axis. Then, the processing start position P
up to g '(that is, the machining start position P on the previous NC data
From the Z value of a'to the position where the calculated amount of movement of the Z axis is corrected) is fast-forwarded to approach the cutting start position Pg and then cutting is restarted. Then, the final path Pn-Pm
Machining of the workpiece (mold) is completed by advancing the cutting to. That is, in the NC data shown in FIG.
The tool movement amounts performed in line numbers 20 to 500 are integrated, and the tool initial position P is divided into the XY axis movement and the Z axis movement up to the machining start position Pg shown in sequence number 4.
From this, NC data of the fast-forward positioning command is created.

In this embodiment, the movement amount of the designated sequence number to the first machining position is automatically integrated and X
It is divided into the amount of movement of Y and the amount of movement of Z, and NC data (N
C code) is created, and as described above, first, the XY axes are fast-forwarded and then the Z-axis is fast-forwarded, so there is no risk of damaging the parts that are not machined and the machines are quickly machined to the machining start position. be able to.

In the above embodiment, as described with reference to the flowchart of FIG. 4, step 5
After integrating the amount of movement in the XYZ axis directions with 0, step 5
Although NC data in the XY-axis direction is created in 2 and NC data in the Z-axis direction is created in step 53, it is also preferable to integrate the movement amount in step 50 separately in advance in the XY direction and the Z direction. Further, in the above-mentioned example, when the NC data for resuming machining is created, the value input when creating the original NC data is used as it is, but the NC data creating device 10 of the present embodiment newly adds various values. It is also possible to input NC command value to create NC data for resuming machining.

Further, in this embodiment, an example in which the sequence number of the path for starting the cutting is designated and the NC data from the path of the designated sequence number to the final machining position is created has been described. The NC data creation device 10 can specify not only the sequence number of the pass for starting the machining but also the sequence number of the pass for finishing the machining. The NC data created by this is
For example, the operator manually deletes NC data that interrupted machining, accidentally deletes NC data after the point at which machining should be restarted, and machining is advanced based on this NC data, so the center of the workpiece It can be used to process the unprocessed part when the unprocessed part remains in the position. Further, the NC data creation device 10 of the present embodiment can specify two sequence numbers and skip the paths having the two sequence numbers to create the NC data.

In this embodiment, the creation of NC data for mold processing has been described as an example, but the present invention can be suitably used for creating NC data for various kinds of processing.

[0027]

As described above, according to the NC data creating apparatus of the present invention, it is possible to automatically create the NC data from the position where the machining is interrupted, and to the already processed portion which is conventionally performed. There is no need to rework (tool feed). In addition, since the re-machining start position can be designated by the sequence number, the machining start position can be easily designated.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an NC data creation device of the present invention.

FIG. 2 is a diagram showing a configuration of an NC data creation device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating N by an NC data creating device according to an embodiment of the present invention.
It is a flow chart which shows processing of C data creation.

FIG. 4 is a flowchart for detailed description of NC data creation processing in the flowchart shown in FIG.

FIG. 5 is an explanatory diagram showing a movement trajectory of a tool based on NC data created by an NC data creating device according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a movement trajectory of a tool based on NC data created by an NC data creating device according to an embodiment of the present invention.

FIG. 7 is a diagram showing shape data according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a movement trajectory of a tool based on NC data of a conventional technique.

[Explanation of symbols]

 10 NC Data Creating Device 12 Computer 14 Display Device 16 Keyboard 18 Storage Device

Claims (1)

[Claims] 1. An NC data creation device for creating NC data by assigning a sequence number to each machining pass, the sequence number designating means for designating a sequence number of a pass for starting cutting, and the sequence number. XY movement NC data generating means for accumulating the movement amounts in the XY directions before the sequence number designated by the designating means to generate NC data for moving in the XY directions, and the sequence number designating means. Z moving NC data creating means for creating NC data for moving in the Z direction by integrating the moving amount in the Z direction before the sequence number, and for cutting from the sequence number specified by the sequence number specifying means. An NC data creation device comprising: a cutting NC data creation means for creating NC data.