JPH03196311A - Numerical controller having three-dimensional circular arc interpolating function - Google Patents

Abstract

PURPOSE:To prevent the generation of a working failure by distributing a normal vector of a three-dimensional plane in the axial directions of a fundamental coordinate system, and processing a rotating direction command of a three-dimensional circular arc interpolating command. CONSTITUTION:Each fundamental shaft data SD obtained by distributing and processing a normal vector of a three-dimensional plane derived by a plane designating G code SC from a plane designating G code storage part 8 in a circular arc command deciding/processing part 3, in the axial directions of a fundamental coordinate system is generated, and sent out to a three-dimensional circular arc projection plane determining part 4. By the three- dimensional circular arc projection plane determining part 4, a plane made by two axes of the fundamental coordinate system for projecting a three-dimensional circular arc in accordance with whether each fundamental shaft data SD is large or small is determined, and projection plane information SE is sent out to a three-dimensional circular arc rotating direction determining part 5. Subsequently, by the three-dimensional circular arc rotating direction determining part 5, the rotating direction command SF of a three-dimensional circular arc interpolating command from the circular arc command deciding/processing part 3 is converted and processed to the circular arc rotating direction command in a projection plane, based on the projection plane information SE, and this circular arc rotating direction command is sent out as a three-dimensional circular arc rotating direction command SG to a function generating part 6. In such a way, a desired three-dimensional circular arc rotating direction is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a plane in an arbitrary three-dimensional coordinate system (hereinafter referred to as
An arc on a dimensional plane (hereinafter referred to as a 3-dimensional arc)
Numerical control (hereinafter referred to as NC) that has the function of interpolating
Regarding equipment.

(Prior art) Conventionally, when interpolating a three-dimensional arc on a three-dimensional plane, three
Project the dimensional plane onto a plane formed by the two axes of the basic coordinate system based on a predetermined command, determine the rotation direction of the projection path of the three-dimensional arc according to the predetermined command, and return the determined rotation direction to the three-dimensional arc. I had been there since.

Figure 5 shows the conventional three-dimensional circular interpolation function described above.
It is a block diagram showing an example of a C device, in which a part program is read into a part program reading/analysis section 1 and analyzed, and command information SA is sent to a three-dimensional arc determination section 31 to determine the presence or absence of a three-dimensional arc. At the same time, plane specification G
The code is sent to the court S or to the plane designation G code storage section 8 and stored therein. When the three-dimensional arc determination unit 31 determines that a three-dimensional arc exists, the three-dimensional arc data SJ is sent to the three-dimensional plane determination unit 32, and the three-dimensional plane SE on which this three-dimensional arc rides is determined. It is sent to the three-dimensional arc rotation direction determining section 51. This three-dimensional plane SF is projected onto a plane formed by 2IIIl of the basic coordinate system based on the plane-specified G-coat SC read out from the plane-specified G-coat storage unit 8, and the rotation direction of the projection path of the three-dimensional arc is determined by reading the part program. /The determined rotation direction is determined according to the rotation direction command of the two-dimensional arc interpolation command SL sent from the analysis section 1, and the determined rotation direction is returned to the three-dimensional arc to become the three-dimensional arc rotation direction command SG, and the function generation section 6 will be sent to. Then, a function is generated by this three-dimensional arc rotation direction command SG and the command information SH read from the part program reading/analysis section 1, and interpolation data Sl is sent to the shaft drive section 7 so that the shaft is driven. It has become.

In such a configuration, the three-dimensional arc rotation direction determination unit 5
To explain the operation example of 1 with the flowchart of Fig. 6, 3
The dimensional circular arc rotation direction determination unit 51 receives a two-dimensional circular interpolation command S.
When L is sent from the part program reading/analysis unit 1 (step 5101), the plane specification G coat SC is read from the plane specification G coat storage unit 8, and it is determined whether the plane specification G coat SC is °G17''. (Step 5102), and the plane designated G coat SC is 'G17.
”, the three-dimensional plane SE read from the three-dimensional plane determination unit 32 is projected onto the X-Y plane (Step 5
103). Then, it is checked whether the projected path of the three-dimensional arc at that time is a straight line (step 5107),
If the projection path of the three-dimensional arc is a straight line, an alarm is generated (step 5ill), and if the projection path of the three-dimensional arc is not a straight line, the process proceeds to step 5ILO.

On the other hand, in the judgment step 5102, if the plane designation G code SC is not 'GI7', it is checked whether the plane designation G code SC is 'G18°' (step 5104), and the plane designation G code SC is “'GI8
”, the 3 read from the 3D plane determination unit 32
Project the dimensional plane SE onto the Z-X plane (step 51
05). Then, it is checked whether the projection path of the three-dimensional arc at that time is a straight line (step 5108),
If the projection path of the three-dimensional arc is a straight line, an alarm is generated (step 5ill), and if the projection path of the three-dimensional arc is not a straight line, the process proceeds to step 5110.

On the other hand, in the judgment step 5104, if the plane designation G code SC is not "G18", the plane designation G code SC is 'GI9°', and the three-dimensional plane SE read from the three-dimensional plane determination unit 32 is determined. Project onto the Y-X plane (step 510B). Then, check whether the projected path of the three-dimensional arc is a straight line or not in step 5.
109) If the projection path of the three-dimensional arc is a straight line, an alarm is generated (step 5i11), 3
If the projected path of the dimensional arc is not a straight line, step S1
] Go to 0.

Then, the rotation direction of the projection path of the three-dimensional arc is determined by the two-dimensional arc interpolation command SL from the part program reading/analysis unit 1.
The rotation direction is determined to be clockwise or counterclockwise according to the rotation direction command "GO2 or GO3°", and the determined rotation direction is returned to a three-dimensional arc to form a three-dimensional arc rotation direction (Step 5i
lo), all processing ends.

(Problem to be Solved by the Invention) A two-dimensional circular interpolation command issued by the above-mentioned conventional NC device having a three-dimensional circular interpolation function is a three-dimensional circular interpolation command in which the command coordinate 1 arc center vector is converted into coordinates. Although the IA is configured to work, the rotation direction in 3D circular interpolation uses the rotation direction command of the 2D circular interpolation command as is, so the desired 3D circular rotation direction may not be obtained. There were drawbacks. For example, in Fig. 7, the three-dimensional plane "a-b-c-d"
1, etc.).

The three-dimensional arc PIP2 is commanded by the part program as a counterclockwise arc "GO2'" when the plane is viewed from the direction of A, and as a clockwise arc "'GO3'" when viewed from the direction of A. Since the arc rotation direction "P + ' = P Reverse rotation direction command when converting to dimensional circular interpolation command” cw-4c
cw, ccw→cw” The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to automatically determine a desired three-dimensional circular arc rotation direction and perform a three-dimensional circular arc rotation direction. An object of the present invention is to provide an NC device that performs interpolation.

(Means for Solving the Problems) The present invention relates to an NC device having a function of interpolating a three-dimensional arc, and the above object of the present invention is to process a machining program instructed in an arbitrary three-dimensional coordinate system using an NC device. A means for converting coordinates into a basic coordinate system controlled by the device, recognizing an interpolation command for a circular arc on a plane in the arbitrary three-dimensional coordinate system, and distributing the normal vector of this plane in the axial direction of the basic coordinate system. means for determining a plane in the basic coordinate system with the axis of the longest vector among the vectors distributed in the axial direction as the projection plane of the circular arc; This is achieved by comprising means for determining the rotation direction.

(Function) The NC device having the three-dimensional circular interpolation function of the present invention distributes the normal vector of the three-dimensional plane in the axial direction of the basic coordinate system, and calculates the three-dimensional circular shape by the sign or negative of the longest vector among the distributed vectors. Since the rotation direction command of the interpolation command is processed, a desired three-dimensional arc rotation direction can always be obtained.

(Example) Fig. 1 is a block diagram showing an example of an NC device having a three-dimensional circular interpolation function of the present invention, corresponding to Fig. 5, and the same components are given the same reference numerals and explanations are omitted. . The command information SA from the part program reading/analysis unit 1 is sent to the three-dimensional coordinate conversion unit 2, and if the three-dimensional coordinate conversion process is in progress, the command information 511 is coordinate-converted to the basic coordinate system, and the three-dimensional coordinate conversion process is in progress. Otherwise, the command information SH is sent as is to the numerical number generator 6. The command information SB coordinate-converted into the basic coordinate system by the three-dimensional coordinate conversion section 2 is sent to the circular arc command determination/processing section 3, where it is determined whether there is a three-dimensional circular interpolation command. When the circular arc command determination/processing section 3 determines that there is a three-dimensional circular interpolation command, the command information SH is sent to the function generating section 6, and when it is determined that there is a three-dimensional circular interpolation command,
Plane specification G coat SC from plane specification G code storage unit 8
Each basic axis data SD is created by distributing the normal vectors of the three-dimensional plane found in the axial direction of the basic coordinate system, and is sent to the three-dimensional arc projection plane determination unit 4. The three-dimensional arc projection plane determining unit 4 determines the plane formed by the two axes of the basic coordinate system on which the three-dimensional arc is projected based on the magnitude of each basic axis data SD, and the projection plane information SE is determined by the three-dimensional arc rotation direction determining unit. Sent on 5th. In the three-dimensional circular arc rotation direction determination unit 5, the rotation direction command SF of the three-dimensional circular interpolation command from the circular arc command determination/processing unit 3 is converted into a circular arc rotation direction command on the projection plane based on the projection plane information SE, This circular arc rotation direction command is sent to the function generating section 6 as a three-dimensional circular arc rotation direction command S6. A function is generated from this arc rotation direction command SG and the command information SH from the three-dimensional coordinate conversion section 2.

In such a configuration, an example of its operation will be explained with reference to the flowchart in FIG.
If the three-dimensional coordinate conversion unit 2 is in the middle of three-dimensional coordinate conversion processing, the three-dimensional coordinate conversion unit 2 converts the coordinates of A into the basic coordinate system and sends it to the arc command determination/lA processing unit 3 (steps Sl, S2). Then, when the arc command determination/lA filling unit 3 determines that there is a three-dimensional circular interpolation command (step S3), the part program commands the 3D arc command using the plane designation G codes ``'G17, G18°'' commanded by the part program. Find the vector in the normal direction of the dimensional plane, and convert that normal vector into the basic coordinate system “X”.
-Y-Z'', vector distribution is performed and sent to the three-dimensional arc projection plane determination section 4 (steps 54 to S8). Find the longest vector of ``VY, AVZ'', and determine the plane formed by 2Ill of the basic coordinate and reference system ``x-y-z'' whose normal is 111I] of the longest vector as the projection plane of the three-dimensional arc. Send to the three-dimensional arc rotation direction determination unit 5 (steps S9 to S51
4). The three-dimensional arc rotation direction determination unit 5 uses the vector distribution data 'AVX. 8VY. AVZ'' in the normal direction of the projection plane, and if its sign is positive, the rotation direction of the three-dimensional circular interpolation command is set as the command, and if its sign is negative, the rotation direction of the three-dimensional circular interpolation command is determined. The command is converted to shift in the reverse direction (steps 515 to 518), and the result is sent to the function generating section 6 to complete all processing.

FIG. 3 is a diagram showing an example of a processing program used in the NG device having the three-dimensional circular interpolation function of the tree invention,
Arbitrary three-dimensional coordinate system "X'-Y'-Z in sequence Nl
”, specify the plane of the machining program in an arbitrary three-dimensional coordinate system in sequence N2, and execute sequence N3.
Processing is then commanded.

Here, the counterclockwise circular arc command GO3 commanded in sequence N5 is "Y'-1" in an arbitrary three-dimensional coordinate system.
``Commands circular interpolation in the counterclockwise direction of the circular arc of the plane viewed from the X° direction.

A method for determining a three-dimensional arc rotation direction when three-dimensional arc interpolation is performed using such a machining program will be explained using FIG. 4. The basic coordinate system is the vector AV in the normal direction ゛' Hectares in the X-axis direction Avx, hectares in the YQb direction, hectares I, 8 VY, and Zflid1 direction vector 0. Then, the part program moves from p+ (command position of sequence N4) to P2 (command position of sequence N5) ``GO3゜゜The three-dimensional arc CI commanded by
If 8VX≧8VY, project R onto the Y-Z plane. Since the sign of 8VX at this time is positive, it is processed as ``GO3''. If 8VX < 8VY, Z- Projected onto the X plane, the sign of 8VY at this time is negative, so ゜゛G0
3→GO2" and processed. Thereafter, known three-dimensional circular interpolation is performed.

(Effect of the invention) As described above, there is no NG that has the three-dimensional circular interpolation function of the tree invention.
According to the device, when performing 3D circular interpolation, the desired 3D circular rotation direction is automatically determined, so it is possible to prevent operation in the wrong 3D circular rotation direction and reduce machining defects. can be prevented from occurring.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of an NC device having the three-dimensional circular interpolation function of the invention, Fig. 2 is a flowchart for explaining an example of its operation, and Fig. 3 is a machining program used in the device of the invention. FIG. 4 is a diagram for explaining a specific operation example of the device of the present invention, FIG. 5 is a block diagram showing an example of a conventional NG device having a three-dimensional circular interpolation function, and FIG. 6 is a diagram showing an example. FIG. 7 is a flowchart for explaining an example of the operation, and is a diagram for explaining a specific example of the operation using the conventional device. 1...Part program reading/analysis section, 2...3
Dimensional coordinate conversion unit, 3...Circular command judgment/processing unit, 4.
... Three-dimensional arc projection plane determining section, 5.51... Three-dimensional arc rotation direction determining section, 6... Function generating section, 7... Axis drive section, 8... Plane specification G code storage Part, 31...
3-dimensional arc determining unit, 32...3-dimensional plane determining unit. Application agent Yuzo Agata No. 7

Claims (1)

[Claims] 1. A means for converting the coordinates of a machining program instructed in an arbitrary three-dimensional coordinate system to a basic coordinate system controlled by a numerical control device, and recognizing an interpolation command for a circular arc on a plane in the arbitrary three-dimensional coordinate system, A means for distributing the normal vector of this plane in the axial direction of the basic coordinate system, and a plane in the basic coordinate system whose normal is the axis of the longest vector among the vectors distributed in the axial direction, A numerical control device having a three-dimensional arc interpolation function, comprising: means for determining a projection plane; and means for determining a rotation direction of the arc based on the sign of the longest vector.