JP2773623B2 - Interpolator for numerical controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interpolator for a numerical control device in which a commanded moving amount is configured as a plurality of blocks and the distribution of the blocks is continuously performed at regular intervals.

[0002]

2. Description of the Related Art Conventionally, this type of interpolator has a configuration shown in FIG.

The residual calculation unit 4 stores a movement amount command value A output from the main CPU 1 and calculates a difference between the movement amount command value A and the integrated amount I output from the feed amount integration unit 8. The difference F is output to the comparison unit 6 and the switching unit 7.

The interpolation calculator 5 outputs the product of the distribution cycle C and the command speed D output from the main CPU 1 to the comparing unit 6 and the switching unit 7 as a feed amount E.

The comparing section 6 compares the residual F output from the residual calculating section 4 with the feed amount E output from the interpolation calculating section 5, and, based on the comparison result, a switching signal G.
Is output to the switching unit 7.

[0006] The switching section 7 receives the residual F or the feed amount E based on the switching signal G output from the comparing section 6.
Is output as the feed amount H, and the feed amount H is output to the feed amount integrating section 8.

The feed amount integrating section 8 outputs the accumulated value of the feed amount H output from the switching section 7 to the residual calculating section 4 as an integrated amount I.

Next, the operation of this type of conventional interpolator when the moving amount command values formed as a plurality of blocks are successively distributed will be described with reference to FIG.

First, the movement amount command value A of the first block is output from the main CPU 1 to the residual calculation unit 4, which stores the movement amount command value A and the movement amount command value A. The difference between the command value A and the integrated amount I output from the feed amount integrating unit 8 is calculated, and the value is output to the comparing unit 6 and the switching unit 7 as a residual F. Here, at the time of the first block distribution, the integrated amount I is 0, and the residual F has a value equal to the moving amount command value A.

The main CPU 1 outputs the movement amount command value A, and at the same time, outputs the distribution cycle C and the command speed D to the interpolation calculation unit 5. In this interpolation calculation unit 5,
The product of the distribution cycle C and the command speed D is calculated, and the value is output as the feed amount E to the comparison unit 6 and the switching unit 7.

Next, the comparing section 6 compares the feed amount E with the residual F. As a result of the comparison, when the residual F is larger than the feed amount E, the switching unit 7 outputs the feed amount E as the feed amount H. Further, the feed amount H is output to the feed amount integrating unit 8, and the feed amount H is accumulated in the feed amount integrating unit 8, and the accumulated value is used as the integrated amount I as the residual calculating unit 4. Is output to
Here, the residual calculating unit 4 again calculates the stored moving amount command value A and the integrated amount I output from the feed amount integrating unit 8.
Is calculated, and this value is output to the comparing unit 6 and the switching unit 7 as a new residual F.

The above operation is repeated for each distribution cycle until the residual F becomes smaller than the feed amount E.

Next, as a result of comparing the residual F with the feed amount E in the comparing section 6, if the residual F becomes smaller than the feed amount E, it is determined that the distribution is the last distribution in one block. A switching signal G is output from 6 to the switching unit 7.

When the switching unit 7 receives the switching signal G output from the comparing unit 6, the switching unit 7 outputs the residual F as a feed amount E. Here, the residual F distributed last is called a fraction.

Next, the feed amount accumulating unit 8 accumulates the feed amount H due to the last distribution, and outputs the integrated value I to the residual calculating unit 4. Here, the moving amount command value A calculated by the residual calculating unit 4 and the integrated value I
The residual difference calculation unit 4 immediately outputs a block distribution completion signal L to the main CPU 1 because the difference between the two is zero.

When the main CPU 1 receives the block distribution completion signal L, the movement amount command value A for the second block is input.
Is output to the residual calculation unit 4. The same operation as described above is repeated for the movement amount command value A for the second and subsequent blocks.

FIG. 6 shows an example of a distribution data sequence by this type of conventional interpolator. The interpolation data shown in FIG. 6 is an example of a case where the movement amount command values of two blocks are continuously distributed, and a fraction is generated at the joint of each block.

[0018]

In the conventional interpolator, since a fraction is generated at a joint between blocks distributed continuously, a speed variation occurs. As a result, setting of machining conditions is very difficult. There is a problem that it becomes difficult and has a great adverse effect on the processing accuracy at the time of cutting.

[0019]

In order to solve the above-mentioned problems, an interpolator according to the present invention comprises a first block, which is a movement amount command value output from a CPU and has a first feed amount at a predetermined cycle. Distribution means for pre-distribution, a fraction control means for pre-reading a residual less than a predetermined distribution amount at the last distribution of the first block, and outputting this value as a fraction, a fraction output from the fraction control means And a second block output from the CPU after the first block, and a postponing addition unit for outputting the added value to the distribution unit. The distribution unit is configured as a block. Is
The difference between the moving amount command value and the integrated value of the first feed amount.
A residual calculation unit for outputting the difference,
The product of the distribution cycle and the commanded speed is used as the second feed amount.
And an interpolation calculation unit that outputs
And the second feed amount output from the interpolation calculator
And, as a result of the comparison, the residual is greater than the first feed.
A first comparing unit that outputs a switching signal when the amount is smaller than the amount
And receiving a switching signal output from the first comparing unit.
Output the residual as a first feed amount,
If the switching signal is not received, the second feed amount is set to the first
A switching unit that outputs the feed amount of the
The first feed amount is integrated, and the product is added to the residual calculation unit.
A feed amount integrating unit that outputs a calculated value .

[0020]

Next, the interpolator of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. Referring to FIG. 1, the main CPU 1 outputs a movement amount command value A to the advance addition unit 2 in block units, and outputs a distribution cycle C and a command speed D to the interpolation calculation unit 5. When receiving the block distribution completion signal M output from the residual calculation unit 4, the next block (movement amount command value A) is output.

The advance adding unit 2 is provided with the main CPU
The sum of the movement command value A output from 1 and the fraction K output from the fraction control unit 3 is calculated, and the value is output to the residual calculation unit 4 as the movement command value B.

Here, the residual calculation unit 4, the interpolation calculation unit 5, the comparison unit 6, the switching unit 7, and the feed amount integration unit 8 in FIG.
Has the same configuration as that of the interpolator described in the description of the prior art, and includes a movement amount command value B (movement amount command value A in the prior art column), a distribution cycle C, and a command speed D from the main CPU 1. And outputs the feed amount H to the fraction control unit 3. However, in the present embodiment, the switching unit 7
The residual F calculated by the residual calculator 4 after the feed amount H is output from is also output to the fraction controller 3.
Upon receiving the residual clear signal J output from the fraction control unit 3, the residual calculation unit 4 outputs a block distribution completion signal M to the main CPU 1 immediately.

The fraction control unit 3 compares the feed amount H output from the switching unit 7 with the residual F calculated and output by the residual calculation unit 4 by outputting the feed amount H. When the residual F is larger than the feed amount H, the feed amount H is output as the feed amount L. When the residual F is smaller than the feed amount H, the feed amount H is set to the feed amount L.
At the same time, it is determined whether or not there is a block to be output next (movement amount command value A). If there is a block to be output next, the residual F is set as a fraction K to the advance adding unit 2. And outputs a residual clear signal J to the residual calculator 4.

Next, the operation of one embodiment of the present invention will be described with reference to FIGS. 1, 2 and 5. FIG. 2 is a diagram showing an example of interpolation data obtained by the interpolator of the present invention, in particular, a case where two blocks are successively distributed.

First, the movement amount command value A of the first block from the main CPU 1 is sent to the advance addition section 2 and the distribution cycle C
And the command speed D are output to the interpolation calculator 5.

In the advance adding section 2, the main CP
The moving amount command value A output from U1 is output to the residual calculation unit 4 as the moving amount command value B. Here, when the first block is output, since the fraction K output from the fraction control unit 3 is 0, the moving amount command value A and the moving amount command value B are equal.

Next, the residual amount calculating section 4 stores the moving amount command value B and calculates the difference between the moving amount command value B and the integrated amount I output from the feed amount integrating section 8. Then, the value is output to the comparing unit 6 and the switching unit 7 as the residual F. Here, at the time of the first block distribution, the integrated amount I is 0, and the residual F has a value equal to the moving amount command value B.

At the same time, the interpolation calculation unit 5 calculates the product of the distribution cycle C output from the main CPU 1 and the command speed D, and the value is used as the feed amount E by the comparison unit 6 and the switching unit. 7 is output.

Next, the comparing unit 6 compares the feed amount E with the residual F. As a result of the comparison, when the residual F is larger than the feed amount E, the switching unit 7 outputs the feed amount E as the feed amount H. Further, the feed amount H is output to the feed amount integrating unit 8, and the feed amount H is accumulated in the feed amount integrating unit 8, and the accumulated value is used as the integrated amount I as the residual calculating unit 4. Is output to
Here, again in the residual calculation unit 4, the stored movement amount command value B and the integrated amount I output from the feed amount integration unit 8 are stored.
Is output to the comparing unit 6 and the switching unit 7 as a new residual F, and is output to the fraction control unit 3 together with the feed amount H.

Next, the fraction control unit 3 compares the feed amount H output from the switching unit 7 with the residual F output from the residual calculation unit 4, and as a result of the comparison, the residual F Is larger than the feed amount H, the feed amount H is equal to the feed amount L.
Is output as

This operation is repeated until the residual F becomes smaller than the feed amount H.

Interpolation data (feed amount D) by the above operation
Becomes as shown in the feed amount in FIG.

Next, as a result of the comparison by the fraction control unit 3, when the residual F becomes smaller than the feed amount H, that is, when the feed amount is output from the interpolation data shown in FIG. The control unit 3 first determines the feed amount H (see FIG. 2).
Is output as the feed amount L, and
It is determined whether or not the next block (movement amount command value A) is output from the main CPU 1, and if so, the residual F is output as a fraction K to the advance adding section 2, and the residual is output. The residual clear signal J is output to the calculator 4.

Upon receiving the residual clear signal J, the residual calculator 4 sets the residual F to 0 and immediately outputs a block distribution completion signal M to the main CPU 1. When receiving the block distribution completion signal M, the main CPU 1 outputs the next block (movement amount command value A) to the advance addition section 2.

Next, the advance adding section 2 newly adds the fraction K output from the fraction control section 3 to the main CPU 1.
Is added to the moving amount command value A output from the control unit 4, and the added value is output to the residual calculation unit 4 as the moving amount command value B.

The operation described above is repeated until all blocks (movement amount command value A) are output from the main CPU 1.

That is, after the feed amount shown in FIG. 2 is output as the feed amount L, the feed amount ′ of the subsequently output block (second block) is output, thereby removing the fraction at the joint of the blocks. can do.

If the fraction control unit 3 determines that the next block (movement amount command value A) is not output from the main CPU 1, the residual F at that time is converted to the feed amount L.
Is output as

That is, when the feed amount G of the second block shown in FIG. 2 is output as the feed amount G, the next block is not output from the main CPU 1, so that the residual F (the feed amount in FIG. ') Is output as the feed amount L at the next distribution.

Next, an embodiment of the advance adding section of the present invention will be described with reference to FIG.

FIG. 3 is a block diagram showing an embodiment of the advance adding section according to the present invention. The moving amount detecting section 31 detects a point in time when a moving amount command value A output from the main CPU 1 is inputted, and adds the detected value. The addition command signal N is output to the unit 32.

The adding section 32 is provided with the moving amount detecting section 31.
Receives the addition command signal N output from the controller, adds the fraction K output from the fraction control unit 3 and the movement amount command value A, and sets the added value as a movement amount command value B as a residual calculation unit 4.
Output to

Next, the fraction control unit will be described with reference to FIG.

FIG. 4 is a block diagram showing an embodiment of the fraction control unit according to the present invention. The comparison unit 41 includes a residual F output from the residual calculation unit 4 and a feed F output from the switching unit 7. Quantity H
And if this residual F is smaller than the feed amount H, the detection signal O is output to the detection unit.

The detecting section 42 detects whether or not the next block (movement amount command value A) is output from the main CPU 1, detects that the next block is output, and outputs the signal to the comparing section 41. Upon receiving the detection signal O output from the controller, the switching signal P is output to the output switching unit 43.

When the switching signal P output from the detection unit 42 is input, the output switching unit 43 outputs the feed amount H output from the switching unit 7 as the feed amount L, The residual F output from the calculating unit 4 is output as a fraction K, and a residual clear signal J is output to the residual calculating unit 4. Further, the switching signal P is not input (the detection signal O is not output from the comparing unit 41).
In this case, the feed amount H output from the switching unit 7 is output as a feed amount L, and the residual F is not output as a fraction K.

Next, the operation of the fraction control unit will be described with reference to FIG.

First, when the feed amount H output from the switching unit 7 and the residual F output from the residual calculating unit are input, the comparing unit 41 compares the feed amount H with the residual F. As a result of the comparison, when the residual F is larger than the feed amount H, the detection signal O is not output. In this case, since the detection signal O is not output from the comparison unit 41, the detection unit 42 does not output the switching signal P, and the output switching unit 43 does not receive the switching signal P. Although it is output as the feed amount L, the fraction K is not output, and the residual clear signal J is not output.

The above operation is repeated until the residual F becomes smaller than the feed amount H.

Next, when the residual F becomes smaller than the feed amount H, the comparator 41 outputs a detection signal O. Next, the detection section 42 receives the detection signal O, detects whether or not the next block (movement amount command value A) is output from the main CPU 1, and detects the next block (movement amount command value A). When not output, the switching signal P is not output, and the output switching unit 43 does not output the residual F as a fraction K because the switching signal P is not input. It is output as the feed amount L at the time.

When the detection block 42 detects that the main CPU 1 outputs the next block (movement amount command value A) after the detection signal O is inputted, it outputs a switching signal P. When the output switching unit 43 receives the switching signal P, the feed amount H is output as the feed amount L, and the residual F is output to the advance adding unit 2 as a fraction K. Further, at the same time, a residual clear signal J is output to the residual calculator 4.

The above operation is repeated as long as the main CPU 1 outputs a block (movement amount command value A).

[0054]

As described above, according to the present invention, the fraction generated at the joint between the blocks (movement amount command values) distributed continuously is added to the movement amount command value of the next block and output. Since the command speed and the moving speed based on the feed amount based on the moving amount command value match, and the speed does not fluctuate at the joint of the moving amount command value, machining conditions can be easily set, and Improve machining accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing interpolation data in the embodiment.

FIG. 3 is a block diagram illustrating a configuration of a postponement adding unit according to the embodiment.

FIG. 4 is a block diagram illustrating a configuration of a fraction control unit according to the embodiment.

FIG. 5 is a block diagram showing a configuration of a conventional interpolator.

FIG. 6 is a diagram showing interpolation data obtained by a conventional interpolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main CPU 2 Advance addition part 3 Fraction control part 4 Residual calculation part 5 Interpolation calculation part 6 Comparison part 7 Switching part 8 Feed amount integration part 31 Movement amount detection part 32 Addition part 41 Comparison part 42 Detection part 43 Output switching part

Claims (5)

(57) [Claims] 1. A distribution means for distributing a first block, which is a movement amount command value output from a CPU, as a first feed amount in a predetermined cycle, and a movement amount command remaining when distributing the first block. The value is read ahead as a residual, the residual is compared with the first feed amount, and based on the comparison result, the first feed amount is output, and the fraction that outputs the residual as a fraction is output. Control means; and a forward addition means for adding a fraction output from the fraction control means and a second block output from the CPU after the first block, and outputting the added value to the distribution means. In the interpolator having the following , the distributing means includes: a moving amount command value configured as a block;
Residual calculation unit that outputs the difference from the integrated value of the residual amount as the residual
And the distribution cycle and command speed output from the CPU.
An interpolation operation unit that outputs a product as a second feed amount; and a residual output from the residual calculation unit and the interpolation operation unit.
Is compared with the second feed amount output from the
Switch if the residual is smaller than the first feed amount
A first comparing unit for outputting a signal, and a switching unit for receiving a switching signal output from the first comparing unit.
Output the residual as a first feed amount,
If no signal is received, the second feed amount is set to the first send amount.
A switching unit that outputs as a feed amount, and integrates a first feed amount output from the switching unit,
The residual calculation unit has a feed amount integration unit that outputs this integrated value.
An interpolator characterized in that: 2. The apparatus according to claim 1, wherein the residual calculation unit is configured as a block.
Between the commanded moving amount command value and the integrated value of the first feed amount
With the first feed amount accumulated last as the residual
2. The interpolator according to claim 1, wherein the signal is output to a section. Wherein said addition means, a second block that is output subsequent to the first block
Is detected, and if so, an addition command
A moving amount detecting unit for outputting a signal, and an addition command signal output from the moving amount detecting unit.
Then, the second block output from the CPU is
Outputs an addition value with the fraction output from the fraction control means
And an adder for performing the operation.
Or the interpolator according to 2 . 4. The fraction control means compares the first feed amount output from the distribution means with a residual.
If the residual is smaller than the first feed amount,
A second comparison unit that outputs a detection signal when the detection signal is output from the second comparison unit ;
And a second block output following the first block.
A detection unit that outputs a switching signal when a lock is present;
This switching is performed based on the switching signal output from the detection unit.
Distributes the first feed amount when a replacement signal is received.
With the residual at this time as a fraction,
The interpolator according to claim 1, further comprising an output switching unit that outputs the result to a unit. 5. The output switching section receives a switching signal output from the detecting means and receives a switching signal.
Residual clear signal for setting the residual value to 0 for the distribution means
Interpolator according to claim 4, characterized in that the output.