JPH04315551A - Nc data producing device - Google Patents

Abstract

PURPOSE:To reduce operation to produce NC data by producing control data of an approach locus and a retract locus only by indicating one locus pattern from a plurality of kinds of stored locus patterns. CONSTITUTION:A machining shape input means 1 comprising a mouth 11 to input the machining shape of a work and a key board 12 and a position indicating means comprising a position setting means 4 to indicate the machining starting position and the machining completion position of a machining shape are provided. Further, a memory means comprising a locus pattern memory means 5 to store a plurality of kinds of locus patterns for an approach locus approaching the machining starting position and a retract locus separated away from the machining completion position and a pattern indicating means comprising a locus pattern setting means 3 to indicate one locus pattern from a plurality of kinds of the locus patterns are provided. Control data is computed by a computing means 6 so that a machining tool effects machining according to the indicated locus pattern and NC data is produced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC data creation device for creating control data for a machining trajectory of a machining tool of an NC machine tool.

0002

[Background Art] Conventionally, when creating control data (NC data) for an NC machine tool that processes workpieces such as molds and jigs, the approach locus where the processing tool approaches the processing start line of the workpiece and the processing end line The data of the retract trajectory in which the machining tool leaves the machine has been created using a CAD/CAM system or an automatic programming device.

[0003] That is, when creating the above control data using a CAD/CAM system, 1. Read out data such as the shape of the workpiece that has been designed and stored in advance.

2. Determine the processing tool to be used for processing.

3. Determine processing conditions.

4. Instructs to draw the machining shape, approach trajectory, and retract trajectory of the workpiece. 5. Perform calculation processing to create control data.

[0007] Each operation was required.

[0008] Furthermore, when creating control data using an automatic programming device, 1. The processing tools used for processing, such as a cutter, wire, or laser, are determined from the design drawing of the workpiece to be processed.

2. Determine processing conditions such as spindle rotation speed and feed rate.

3. Program the approach trajectory and retract trajectory.

4. Program the machining shape of the workpiece.

5. Processing tool movement order (tool motion command)
program.

The following operations were required.

On the other hand, the above-mentioned automatic programming device automatically shifts the end point of machining to eliminate protrusions that occur at the start point of machining when machining into a shape such as a circle, and performs machining with overlapping paths. (Japanese Unexamined Patent Publication No. 62-263505),
A method has been disclosed in which a machining start path and an end path are automatically calculated by inputting a pick start point and an end point (Japanese Patent Laid-Open Publication No. 62-271106).

[0015]

[Problems to be Solved by the Invention] However, the above-mentioned Japanese Patent Application Laid-Open Nos. 62-263505 and 62-271106
The automatic programming device and CAD/CAM shown in the publication
The system requires the operator to program approach and retract trajectories each time, which takes time and effort, and requires advanced knowledge and experience to create appropriate approach and retract trajectories. be.

[0016] The present invention solves the above problem, and an object thereof is to provide an NC data creation device that automatically generates an approach locus and a retract locus with a simple operation.

[0017]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an NC data creation device for creating control data of a machining trajectory of a machining tool of an NC machine tool. an input means, a position indicating means for instructing a machining start position and a machining end position on the machining shape, and storing a plurality of types of trajectory patterns including an approach trajectory approaching the machining start position and a retract trajectory departing from the machining end position. a storage means for instructing one trajectory pattern from among the plurality of types of trajectory patterns, and an operation for computing control data of a machining trajectory so that the machining tool performs machining in accordance with the instructed trajectory pattern. It is equipped with means.

Further, in the second aspect of the present invention, the locus patterns stored in the storage means are set such that the distance from each start position to the machining start position is a constant distance depending on the machining shape of the workpiece. .

[0019]

[Operation] According to the NC data creation device having the above configuration, a plurality of types of trajectory patterns including approach trajectories and retract trajectories are stored, and the machining shape of the workpiece is inputted, and one of the plurality of types of trajectory patterns is selected from among the plurality of types of trajectory patterns. When a locus pattern is specified and a machining start position and a machining end position on the machining shape are specified, control data for the machining locus is automatically calculated so that the machining tool performs machining according to the specified locus pattern. .

Further, according to the NC data creation device of claim 2, the trajectory patterns to be stored are set so that the distance from each start position to the machining start position is a constant distance depending on the machining shape of the workpiece. Good too.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows an example of a system constituting an NC data creation apparatus according to the present invention.

This system creates control data (NC data) for machining a workpiece with an NC machine tool, and is composed of a mouse 11, a keyboard 12, a CRT 13, a paper tape puncher 14, and a personal computer 15. The mouse 11 and keyboard 12 are used to input various data necessary for machining, such as trajectory patterns (approach trajectory and retract trajectory patterns), machining shape, and machining conditions, into the personal computer 15. The CRT 13 displays the machining shape, trajectory pattern, etc. inputted above. The paper tape puncher 14 punches control data generated by the personal computer 15 into a paper tape. The NC machine tool operates by reading control data from the paper tape. Note that instead of the paper tape puncher 14, a means for storing data in a storage medium such as a floppy disk is provided, and the NC
The machine tool may read the control data from the floppy disk or the like.

The personal computer 15 stores a plurality of types of locus patterns, as well as the input machining conditions, etc., generates control data using the input contents and the calculation program, and outputs the control data to the paper tape puncher 14. be. Further, the personal computer 15 is configured to receive data such as the processed shape of the workpiece from the host computer 16. The host computer 16 stores the machining shape of the workpiece that has been designed and inputted in advance.

Next, the block configuration showing the means for creating NC data according to the present invention will be explained with reference to FIG. The means for creating NC data consists of machining shape input means 1, machining condition setting means 2, trajectory pattern setting means 3, machining start line setting means 4, trajectory pattern storage means 5, data calculation means 6, code conversion means 7, etc. These are computer 15
It is located inside the building.

The processing shape input means 1 is the mouse 11 described above.
It consists of a keyboard 12 and the like, and inputs data such as the machining shape of the workpiece stored in the host computer 16 to the data calculation means 6. Note that the machining shape input means 1 directly inputs data on the machining shape of the workpiece.
It may also be input to the data calculation means 6.

The machining condition setting means 2 includes tool data such as the model name of the NC machine tool, the diameter, corner diameter, length, and material of the cutter that is the machining tool, and various machining information provided in the control section of the NC machine tool. Register numbers for reading conditions, discharge conditions such as discharge voltage or discharge pulse width, and machining condition data such as offset amount, spindle rotation speed, feed speed, etc., are input to the data calculation means 6 by operating the keyboard 12 or the like.
This is what you input. Furthermore, by setting machining conditions using register numbers as described above, it is possible to set machining conditions even if the operator has no knowledge or experience in machining, and it is also possible to operate the NC machine tool during machining. It becomes possible to set processing conditions that take advantage of the operator's experience and knowledge.

The locus pattern setting means 3 selects and instructs one locus pattern from among the plurality of locus patterns (FIG. 3) stored in the locus pattern storage means 5 according to the operation of the keyboard 12, etc., and performs data calculation. This is input to means 6. The trajectory pattern setting means 3 inputs trajectory parameters such as the corner diameter of the start point of machining, the approach trajectory approaching the machining start position, or the retract trajectory departing from the machining end position to the data calculation means 6 by operating the keyboard 12 or the like. I am trying to input it.

The position setting means 4 selects and instructs a machining start position and a machining end position from the machining shape of the workpiece inputted by the machining shape input means 1 by operating the keyboard 12 or the like, and inputs the selected machining start position and machining end position to the data calculation means 6. . Further, the position setting means 4 inputs the machining progress direction (arrow 86 in FIG. 7) to the data calculation means 6. The trajectory pattern storage means 5 stores a plurality of types of trajectory patterns, such as an approach trajectory to a machining start position or a retract trajectory from a machining end position shown in FIG. 3, for example. In addition,
The six types of locus patterns shown in FIG. 3 are two-dimensional locus patterns generally used in wire electric discharge machining, and the locus patterns stored in the locus pattern storage means 5 are not limited to these. That is, the trajectory pattern storage means 5 stores various trajectory patterns corresponding to the types of NC machine tools such as laser processing and cutting processing.

The data calculation means 6 performs calculation processing on the basis of each of the input data, converts it into control data (NC data) including a G code indicating the preparation function, and outputs the control data to the code conversion means 7. It is something to do. The code conversion means 7 controls the paper tape puncher 14 to punch holes in the paper tape according to the control data.

Note that the conversion to control data (NC data) is based on the intermediate CLS (Cutte Line) that defines the cutter locus.
After the NC machine tool to be used is determined, parameters pointing to that machine may be added and input to the host processor to create control data.

Next, an example of the operation of the NC data creation device will be explained using the flowchart of FIG. 4, taking as an example the case where the press-type die 8 shown in FIG. 6 is machined with an NC machine tool (wire electric discharge machine). . That is, the machining shape shown in FIG. 6 is stored in the host computer 16, and the closed area surrounded by the machining shape line 80 is removed by the NC machine tool. Further, the start hole 81 indicates a hole machined to start the process, and the mounting hole 82 indicates a hole machined to pass a bolt for mounting the die portion 8, respectively.

When the operation of creating NC data starts, a screen as shown in FIG. 5 is displayed on the CRT 13, and the operator performs operations using the keyboard 12 or the like while checking the display screen. That is, by operating the keyboard 12 or the like (machining shape input means 1), the machining shape (
The data shown in FIG. 6) is input from the host computer 16 to the data calculation means 6, and then tool data, machining condition data, etc. are input to the data calculation means 6. Further, one of the plurality of trajectory patterns (FIG. 3) stored in the trajectory pattern storage means 5 is selected and inputted to the data calculation means 6, and the trajectory parameters are set as data by the position setting means 4. It is input to the calculation means 6 (steps S1 to S5).

Thereafter, the machining shape of the workpiece inputted by the machining shape input means 1 is displayed on the CRT 13. That is, the CRT 13 displays a graphic as shown in FIG. 6 described above. Then, a start point 84, which is the starting position of the wire shown in FIG. , S7).

[0034] The above starting point 84 and processing line 83
If the trajectory shape, etc. is not set properly after the instruction, (
If NO in step S8), the process returns to step S5 by operating the keyboard 12 or the like, and the trajectory parameters, start point 84, machining line 83, etc. are input again. Then, when the above-mentioned trajectory shape etc. are properly set (YES in step S8).
S), data calculation means 6 by operating the keyboard 12, etc.
As a result, control data indicating movement data of the tool (wire) is generated, and the paper tape puncher 14 is controlled by the code conversion means 7, and the paper tape is punched in accordance with the control data (step S9).

That is, as shown in FIG. 7, control data for the trajectory 85 is generated, such as the approach trajectory of the machining line 83 to the machining start position and the retract trajectory from which the machining line 83 departs from the machining end position. In addition, FIG. 7 shows the data calculation means 6.
This is a graphic representation of the control data generated by , and each arrow 86 indicates the direction of movement of the wire.

In this way, control is performed to indicate tool motion data based on the machining shape of the workpiece and tool data inputted by the machining shape input means 1, and data such as trajectory pattern selection inputted by operating the keyboard 12, etc. Since the data is automatically generated and the paper tape is automatically punched, there is no need for complicated operations such as drawing approach and retract trajectories and issuing tool motion commands as in the past. Mistakes such as forgetting to input some graphical elements when processing a shape are reduced.

Next, another example of the locus pattern stored in the locus pattern storage means 5 will be described with reference to FIG. In this embodiment, the locus pattern storage means 5 has two
．． Multiple types of 5-dimensional or 3-dimensional trajectory patterns are stored. Note that in FIG. 8, hatched portions indicate the shape of the workpiece, and each hatched line indicates the processed shape in each cross section. Moreover, the lower figure of each type shows a side view.

In addition, the trajectory patterns shown in types 1 to 3 are such that only the height (Z coordinate) of the start point (start position) 9 changes as the machining progresses.
This is a 5-dimensional trajectory pattern, and on the other hand, the 2.5-dimensional trajectory patterns shown in types 4 and 5 are made in response to changes in the Z coordinate so that the distance between the start point 9 and the machining start position 10 is constant. The position (X, Y coordinates) on the processing plane is changed. That is, the feed rate of the machining tool on the approach locus and the retract locus is equal to the machining feed rate, and in the locus patterns shown in types 4 and 5 above, the start point 9 is changed according to the machining shape, so the machining start position 10 The moving time of the machining tool up to this point is constant, and the machining time can be shortened compared to the trajectory patterns shown in Type 2 and Type 3.

Note that the trajectory patterns stored in the trajectory pattern storage means 5 are not limited to the five types of trajectory patterns shown in FIG.

[0040]

Effects of the Invention The present invention automatically generates control data for the approach trajectory and retract trajectory by simply instructing one trajectory pattern from among a plurality of stored trajectory patterns. The operations for drawing and programming the retract locus are reduced, and the operations for creating NC data can be reduced. In addition, since it is organized and stored in multiple types of trajectory patterns,
NC data can be created with simple operations without requiring knowledge or experience regarding approach trajectories and retract trajectories.

Furthermore, since the trajectory patterns stored in the storage means are set so that the distance from each start position to the machining start position is a constant distance depending on the machining shape of the workpiece, machining time can be shortened. can do.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an NC data creation device according to the present invention.

FIG. 2 is a system diagram showing an example of a system constituting the NC data creation device according to the present invention.

FIG. 3 is a diagram showing an example of a trajectory pattern stored in trajectory pattern storage means.

FIG. 4 is a flowchart showing an example of the operation of the NC data creation device according to the present invention.

FIG. 5 is a diagram showing an example of a display screen displayed on a CRT according to the present invention.

FIG. 6 is a diagram showing an example of a processed shape of a workpiece according to the present invention.

FIG. 7 is a diagram showing an example of a machining trajectory of a workpiece according to the present invention.

FIG. 8 is a diagram showing another example of trajectory patterns stored in trajectory pattern storage means.

[Explanation of symbols]

1 Processing shape input means 2 Processing condition setting means 3 Trajectory pattern setting means 4 Position setting means 5 Trajectory pattern storage means 6 Data calculation means 7 Code conversion means 11 Mouse 12 Keyboard 13 CRT 14 Paper tape puncher 15 PC 16. Host computer

Claims (2)

[Claims] 1. An NC data creation device that creates control data for a machining trajectory of a machining tool of an NC machine tool, comprising a shape input means for inputting a machining shape of a workpiece, and a machining start position and a machining end position on the machining shape. a position indicating means for instructing; a storage means for storing a plurality of types of trajectory patterns including an approach trajectory approaching the machining start position and a retract trajectory departing from the machining end position; An NC data creation device comprising: pattern instruction means for instructing a locus pattern; and arithmetic means for computing machining locus control data so that the machining tool performs machining according to the instructed locus pattern. 2. The locus pattern stored in the storage means is set such that the distance from each start position to the machining start position is a constant distance depending on the machining shape of the workpiece. The NC data creation device according to claim 1.