JP2842503B2 - Numerical control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device, and more particularly, to a numerical control device capable of notifying an operator of the occurrence of a cutter mark and the location where the cutter mark has occurred.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing an example of a conventional numerical controller. The numerical control device 61 includes a communication processing unit 71 that receives a processing program given from the NC tape N or the personal computer P, a reception buffer 72, a memory 73, a control unit 101, a display unit 108, and a display such as a CRT. It comprises a device 109, a drive unit 110, and a motor 111. The control unit 101 includes a machining program analysis unit 102, an interpolation unit 103, and an acceleration / deceleration unit 104.

Next, the operation of the numerical controller 61 will be described. The machining program analysis unit 102 analyzes the machining program and calculates a movement amount. The processing program may be stored in the reception buffer 72 through the communication control unit 71, or may be stored in the memory 73 in advance. Next, the interpolation unit 103 performs an interpolation process on the movement amount. The acceleration / deceleration unit 104 performs acceleration / deceleration based on the result of the interpolation processing, and controls driving of the motor 111 through the driving unit 110. On the other hand, the display processing unit 108 generates screen data of the tool path trajectory from the data obtained from the interpolation unit 103, and displays the tool path trajectory on the display device 109.

[0004]

In the above-described conventional numerical controller 61, the amount of the machining program digested by the machining becomes larger than the amount of the machining program supplied via the communication line, or the machining program analysis unit 102 If the amount of analysis becomes larger than the amount of analysis, the tool stops during the machining, and a scratch called a cutter mark occurs. However, there is a problem that the operator tends to overlook the occurrence of the cutter mark. This cutter mark is remarkably generated when high-speed machining by minute line segment machining is performed. For example, as shown in FIG. 8, an An block (G0
1Xx2Yy2Ff2;)
B1 block of circular interpolation (G03Xx3Yy3Ii3Jj
If the analysis of 3;) is not completed, the tool T stops at the end point of the An block while the tool T is in a rotating state, so that a cutter mark CM is generated on the workpiece W.

It is an object of the present invention to provide a numerical controller capable of notifying an operator of the occurrence of a cutter mark and the location where the cutter mark has occurred.

[0006]

According to a first aspect of the present invention, there is provided a numerical control apparatus comprising: a machining program analyzing unit for analyzing a machining program; and an interpolation unit for executing an interpolation process based on an analysis result by the machining program analyzing unit. Numerical control comprising: control means for adjusting the control speed of the machine tool based on the interpolation result by the interpolation means; and graphic tracing means for drawing a tool path trajectory based on the interpolation result by the interpolation means. In the apparatus, an interpolation interruption detecting means for detecting an interruption of the interpolation by the interpolation means, and a cutter mark display means for displaying a cutter mark at a position corresponding to the interruption of the interpolation on the tool path trajectory drawn by the graphic tracing means. It is provided with.

[0007] The numerical controller according to the second aspect of the present invention comprises:
A receiving buffer for storing the machining program data transferred via the communication line, and a machining program analyzing means for analyzing the machining program stored in the receiving buffer;
Interpolation means for executing an interpolation process based on the analysis result by the machining program analysis means; control speed adjustment means for adjusting the control speed of the machine tool based on the interpolation result by the interpolation means; and interpolation results by the interpolation means. A numerical control device comprising: a graphic tracing means for drawing a tool path trajectory based on the data transfer interruption detecting means for detecting a data transfer interruption; and a data transfer on the tool path trajectory drawn by the graphic tracing means. Cutter mark display means for displaying a cutter mark at a portion corresponding to the occurrence of interruption.

[0008]

In the numerical controller according to the first aspect of the present invention, the interruption of the interpolation by the interpolation means is detected, and the cutter mark is displayed at the position corresponding to the occurrence of the interruption on the tool path trajectory. The operator can be notified of the occurrence of the cutter mark and the location where the cutter mark has occurred.

In the numerical controller according to the second aspect of the present invention, the interruption of the data transfer is detected and the cutter mark is displayed at the position corresponding to the interruption of the data transfer on the tool path trajectory. The operator can be notified of the occurrence of the cutter mark and the location where the cutter mark has occurred.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that the present invention is not limited by this.

Embodiment 1 FIG. FIG. 1 is a block diagram illustrating a numerical control device according to a first embodiment of the present invention. In the numerical control device 31, a communication processing unit 71, a reception buffer 72, a memory 73, a control unit 101 (and its internal configuration), a display unit 108,
A display device 109, a driving unit 110, a motor 111,
The NC tape N and the personal computer P are the same components as the conventional numerical controller 61 described above with reference to FIG.
The same reference numerals are given. However, in addition to these components, the interpolation interruption detecting unit 2 for detecting the interruption of the interpolation is used.
01 and a cutter mark display requesting unit 203 that turns on a cutter mark display request flag 202 when interruption of interpolation is detected.

Next, an operation mainly performed by the interpolation interruption detecting unit 201 and the cutter mark display requesting unit 203 will be described with reference to a flowchart shown in FIG. For convenience of explanation, it is assumed that machining based on the first block of the machining program has been completed. First, in step S200, it is determined whether or not the machining program analysis unit 102 has completed the analysis of the machining program for the next block. If the analysis of the machining program has been completed, it is determined that there is no interruption in interpolation, and the process proceeds to step S201. If the analysis of the machining program is not completed, it is determined that the interpolation is interrupted, and the process proceeds to step S203.

In step S201, the analyzed machining program is called to the interpolation unit 103. Step S202
Then, the interpolation unit 103 performs an interpolation calculation.

In step S203, there is a danger that a cutter mark may be generated due to the interruption of the interpolation.
8 is requested to display a cutter mark.

In step S204, the tool path trajectory is displayed using the result of the interpolation calculation. At this time, if the cutter mark display request flag is ON, the cutter mark is displayed at a position on the corresponding tool path locus. Thereafter, the process returns to step S200. FIG. 3 is a display example of a cutter mark. P0 indicates a tool path trajectory according to the positioning command G00. P1 indicates a tool path trajectory according to the linear interpolation command G01. CM indicates a cutter mark generated between a block for linear interpolation and a block for the next circular interpolation. TP indicates the current tool position.

Embodiment 2 FIG. FIG. 4 is a block diagram showing a numerical controller according to Embodiment 2 of the present invention. The numerical controller 41 has substantially the same configuration as the numerical controller 31 of the first embodiment described above with reference to FIG. However, the second embodiment differs from the second embodiment in that the uncompleted block number detection unit 211 is used instead of the interpolation interruption detection unit 201 and that a cutter mark display request unit 213 having a different configuration from the cutter mark display request unit 203 is used. Is different. The interpolation unit 103 has a built-in display block counter for counting the number of blocks (interpolation completed) displayed on the display device 109 at the start of the automatic operation.

The unreceived block number detecting section 211
It has a built-in receiving block counter that counts the number of blocks of the machining program data transferred via the communication line, and detects interruption of communication using the receiving block counter. Cutter mark display request unit 213
Checks the unreceived block number detected by the unreceived block number detection unit 211 with the display block counter number (the block number currently being displayed), and turns on the cutter mark display request flag 202 if they match. .

Next, an operation focusing on the incomplete block number detecting section 211 will be described with reference to a flowchart shown in FIG. First, in step S300, a reception block counter is initialized. In step S301,
It waits until a machining program analysis command is issued. In step S302, it is determined whether the transfer of the machining program of one block to the reception buffer 112 has been completed. Specifically, if there is a block end command EOB at the end of the machining program transferred to the reception buffer 112,
It may be determined that the transfer of the machining program has been completed, and if there is no block end command EOB, it may be determined that the transfer of the machining program has not been completed. If you have completed the transfer,
It is determined that the communication has not been interrupted, and step S3
Go to 03. If the transfer of the machining program has not been completed, it is determined that the communication has been interrupted, and the process proceeds to step S305.

In step S303, the reception buffer 11
2 is analyzed. Step S
In 304, the interpolation unit 103 performs an interpolation calculation.

In step S305, a reception block counter number is set as a communication interruption block number. The communication interrupted block number can specify the communication interrupted block number, that is, the block number at risk of generating a cutter mark. It should be noted that a plurality of reception block counter numbers can be stored in the area storing the communication break numbers, so that a plurality of communication breaks can be detected. In step S306, the reception block counter is updated, and the process returns to step S301.

Next, the operation mainly with the cutter mark display request unit 213 will be described with reference to the flowchart shown in FIG. Note that the processing of the cutter mark display request unit 213 is performed simultaneously and in parallel with the processing of the incomplete reception block number detection unit 211. First, in step S320, a display block counter is displayed. Step S32
In step 1, it is determined whether the machining program analysis unit 102 has completed the analysis of the machining program for the next block. If the analysis of the machining program has been completed, the process proceeds to step S322. If the analysis of the machining program has not been completed, the process proceeds to step S322.
Proceed to 327.

In step S322, the analyzed machining program is called by the interpolation unit 103. Step S323
Then, the interpolation unit 103 performs an interpolation calculation.

In step S324, it is checked whether or not the display block counter number matches the communication interruption block number. If they match, the process proceeds to step S325.
If not, the process proceeds to step S326. Step S32
In 5, the cutter mark display request unit 213 turns on the cutter mark display request flag 202. Step S
At 326, the display block counter is updated.

In step S327, the tool path trajectory is displayed using the result of the interpolation calculation. At this time, if the cutter mark display request flag is on, the cutter mark is displayed on the tool path locus, as illustrated in FIG. Thereafter, the process returns to step S321.

[0025]

According to the numerical controller of the present invention, the interruption of the interpolation or the interruption of the communication is detected, and the location where there is a danger of generating a cutter mark is displayed on the tool path.
The operator can visually grasp the location of the cutter mark.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a numerical control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the numerical control device of FIG. 1;

FIG. 3 is an explanatory diagram of a cutter mark display on a tool path locus.

FIG. 4 is a block diagram of a numerical control device according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of the numerical controller of FIG. 4;

FIG. 6 is another flowchart showing the operation of the numerical controller of FIG. 4;

FIG. 7 is a block diagram showing a conventional numerical control device.

FIG. 8 is an explanatory diagram showing a process of generating a cutter mark.

[Explanation of symbols]

 31, 41, 61 Numerical control device 101 Control unit 71 Communication control unit 72 Receive buffer 73 Memory 102 Machining program analysis unit 103 Interpolation unit 104 Acceleration / deceleration unit 108 Display unit 109 Display device 110 Drive unit 111 Motor 201 Interpolation interruption detection unit 202 Cutter Mark display request flag 203, 213 Cutter mark display request unit 211 Unreceived block number detection unit N NC tape P Personal computer

Continuation of the front page (56) References JP-A 1-311304 (JP, A) JP-A 7-239707 (JP, A) JP-A 5-313726 (JP, A) JP-A 5-210408 (JP) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) G05B 19/4068 G05B 19/4061

Claims (2)

(57) [Claims] 1. A machining program for analyzing a machining program.
Analysis means and analysis by the machining program analysis means
Interpolation means for executing an interpolation process based on the result;
Control speed of the machine tool based on the interpolation result
Control speed adjusting means for adjusting, and interpolation by the interpolating means
Graphic drawing tool path trajectory based on the result
In the numerical control device provided with a race means, an interpolation break detection for detecting a break in the interpolation by the interpolation means is provided.
Output means and the graphic trace means.
At the point where interpolation is interrupted on the tool path
And cutter mark display means for displaying a target mark.
A numerical control device characterized by being provided . 2. A process in which data is transferred via a communication line.
Receive buffer for storing the program and its receive buffer
Machining program that analyzes the machining program stored in the
Analysis means and analysis by the machining program analysis means
Interpolation means for executing an interpolation process based on the result;
Control speed of the machine tool based on the interpolation result
Control speed adjusting means for adjusting, and interpolation by the interpolating means
Graphic drawing tool path trajectory based on the result
A data transfer interruption detecting means for detecting an interruption of data transfer in a numerical control device having a race means.
Columns and drawn by the graphic tracing means
The location corresponding to the interruption of data transfer on the tool path
And cutter mark display means for displaying
A numerical control device, comprising: