JP3482536B2 - Die height adjustment device for press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die height adjusting device for a press machine which moves a slide up and down to adjust the die height when the die of the press machine is replaced.

[0002]

2. Description of the Related Art In a press machine, the die height is adjusted when the die is replaced. The die height is adjusted by issuing a drive command according to the slide target position (desired die height value). In addition to the adjusting motor that drives the motor, the slide is moved up and down according to the driving of the motor to position the slide at the target position.

In this case, the content of the drive command is the amount of movement of the slide, the slide is moved by a preset amount of movement so as to obtain the above target value, and the motor is stopped when the slide moves by the amount of movement. (Drive command is turned off).

However, the dynamic friction coefficient and the like of the adjust motor drive system may change due to aging, and in such a case the load applied to the adjust motor will change, and this change will cause the slide to fall within the permissible range before and after the target position. That is, it may not be possible to perform positioning within the so-called in-position width. In this way, when the slide overruns or underruns beyond the in-position width and positioning fails, repositioning is performed to position the slide within the in-position width.

At the time of repositioning, the overrun amount or underrun amount at the time of positioning failure is data-processed, the drive command is corrected, and the corrected drive command is output to the motor.

[0006]

However, there are two causes of failure, one is a steady one due to aging as described above, and the other is a sudden or transient factor.

Therefore, if the cause of the failure is a constant change due to secular change, if the drive command is corrected using the data at this time, a steady change due to secular change at the time of the next repositioning will occur. There is a high possibility that the repositioning will be successful and that the repositioning will be successful. However, if the cause of the failure is the above-mentioned sudden or transient one, even if the drive command is corrected using the data at this time, steady fluctuation due to secular change during the next repositioning is performed. Cannot be effectively corrected and the repositioning is very unlikely to be successful. In such a case, the positioning may have to be performed again, and the work efficiency is greatly impaired.

Therefore, according to the present invention, the overrun or underrun at the time of successful positioning is always a steady one due to the secular change. Therefore, if the data at the time of successful positioning is used, the steady run due to the secular change is always made. This is done by paying attention to the fact that the dynamic fluctuation can be effectively corrected, and the purpose is to adjust the die height efficiently so that the repositioning can be successful once. .

[0009]

Therefore, according to the present invention,
A drive command according to the target position of the slide is applied to a motor that drives the slide of the press machine, the slide is moved up and down according to the drive of the motor, and the slide is positioned at the target position. In a die height adjusting device of a press machine for adjusting, each time the slide is positioned, a detecting means for detecting an actual position of the slide, a predetermined first threshold value smaller than the target position, and the target. Setting means for setting a predetermined second threshold value larger than the position as a threshold value for judging successful positioning, and the slide position detected by the detecting means each time the slide is positioned, A judging means for judging whether or not it is within a predetermined range equal to or more than the first threshold value and equal to or less than the second threshold value; When it is determined that the issued slide position is within the predetermined range, a storage unit that stores the deviation between the detected slide position and the target position as correction data in association with the number of times of positioning, When it is determined by the determination means that the detected slide position is outside the predetermined range, based on the latest predetermined number of correction data stored in the storage means,
Comprising a correction means for correcting the drive command, and outputs the drive command corrected by the correction means to the motor,
The slide is repositioned.

[0010]

In other words, according to this structure, the actual position of the slide is detected every time the slide is positioned. Then, a predetermined first threshold value smaller than the slide target position and a predetermined second threshold value larger than the target position are set as threshold values for determining the positioning success. And every time the slide is positioned,
If the detected slide position is greater than or equal to the first threshold value, the second
It is determined whether or not it is within a predetermined range equal to or less than the threshold value of.

When it is determined that the detected slide position is within the predetermined range, the deviation between the detected slide position and the target position is stored as correction data in correspondence with the number of positioning times. It Then, if it is determined that the detected slide position is outside the predetermined range,
The drive command is corrected based on the latest stored correction data for the predetermined number of times, the corrected drive command is output to the motor, and repositioning of the slide is performed once without failure.

[0012]

Embodiments of the die height adjusting apparatus for a press machine according to the present invention will be described below with reference to the drawings.

In this embodiment, it is premised that the die height adjustment is performed by automatic operation.

That is, as shown in FIG. 1, in a die height adjusting apparatus in which automatic operation is performed, data such as a desired die height value DHd according to the type of mold is input to the controller 3, and driving is performed according to this data. Command (Slide 1
Drive command given to the motor in anticipation of the coasting amount of
S is output from the controller 3 to the adjustment motor 4. Then, the motor 4 is driven, whereby the slide 1
Is moved up and down, and the die height DH is automatically set to the target value DHd.
And slide 1 is set to the die height target value DH.
The target position Pd corresponding to d is positioned.

Here, the distance between the upper end 2a of the die 2 and the lower end 1a of the slide 1 is the die height DH, and the slide 1 can freely move between the minimum die height value DHmin and the minimum die height value DHmax. This movement width is shown as the slide adjustment movement amount AD.

Therefore, for example, when the upper end 2a of the die 2 is the origin, the vertically upper position is the plus position, and the vertically lower position is the negative position, the slide 1 (lower end 1) is positioned.
The actual position P in a) is detected by the encoder 5 attached to the motor 4 and fed back to the controller 3.

FIG. 2 conceptually shows how the actual position P of the slide 1 deviates from the target position Pd of the slide 1. As shown in FIG. The threshold value Pu is set to be as small as possible, and the threshold value Po is set to be larger than the target position Pd by a predetermined amount. The setting is performed by the CPU inside the controller 3 or given as input data.

When the position of the slide 1 is the threshold Pu or more,
When the position is within the predetermined range below the threshold value Po, that is, within the in-position width, the positioning is successful, and for example, the position of the slide 1 is P1 (overrun), P2 (underrun), P3 (overrun). Is the case. On the other hand, whether the position of slide 1 is smaller than the threshold value Pu,
If it is in the range larger than the threshold value Po, it means that the positioning has failed. For example, the position of the slide 1 is P4 (underrun), P5 (overrun).
Is the case.

At the time of positioning, the CPU of the controller 3 performs processing in the procedure shown in FIG.

That is, as shown in the figure, when the process is started, the drive command S corresponding to the slide target position Pd is output from the controller 3 to the adjust motor 4.
As a result, the motor 4 is driven by the drive amount S. Here, the drive amount S is a drive amount that allows for coasting of the slide 1. As a result, the slide 1 is moved by the drive of the motor 4, and even after the motor 4 is turned off, the slide 1 is moved by a predetermined coasting amount and the slide 1 is positioned at the position P (step 101). Then, the actual position P of the slide 1 at the time of this positioning is input to the controller 3 as data (step 102).

Then, it is judged whether or not the actual position P of the slide 1 is within the predetermined range Pu to Po (step 103).

As a result, if it is determined that the actual slide position P is within the predetermined range Pu to Po (YES at step 103), it means that the positioning has succeeded, and the overrun amount or The underrun amount is stored in the correction data area of the memory of the controller 3, as shown in FIG.

Here, the memory table of FIG. 4 is a table in which data such as set height and processing height necessary for controlling the controller 3 is stored for each type of mold,
For example, when the number "47" is designated as the mold type, the data in the portion surrounded by the bold line in the table is used.

The correction data area is 1 from D0 to D9.
There is only a capacity to store 0 data, and the overrun amount or the underrun amount at the latest successful positioning of 10 times is stored in each of D0 to D9.

For example, the slide position at the time of success two times before is calculated backward from the latest success time is P1, the overrun amount at that time is d1, and the slide at the latest success time (immediately preceding success time). Assuming that the position is P2 and the amount of underrun at that time is d2 (see FIG. 2), the contents of the correction data D0 to D9 are ... D8 = d1 D9 = d2 ... (1) Memorized in.

However, the next successful slide position is P
3 and the overrun amount at that time is d3 (see FIG. 2), there is no place to write this data in the memory. Therefore, the contents of the correction data are updated one by one so that the oldest data is removed, and the contents are set to D7 = d1 D8 = d2 D9 = d3 ... (2) (step 104). Then, the positioning process is ended, and when the next command for the positioning process is issued, the same process is performed again from step 101.

On the other hand, when it is determined that the detected actual slide position P is outside the predetermined range Pu to Po (determination NO in step 103), it means that the positioning has failed and the slide 1 is moved. Repositioning is performed in order to position within the predetermined range Pu to Po.

That is, first, the correction data D0 to D9 are read from the memory shown in FIG. Then, the correction amount ΔS of the drive command S is calculated based on the correction data D0. In this case, the maximum amount of overrun (maximum value) and the maximum amount of underrun are selected from the correction data D0 to D9 in order to remove the salient data, that is, the abrupt or transient data that is not a change due to aging. The quantity (minimum value) is removed and the arithmetic mean of the remaining eight data is determined. Then, this arithmetic mean value is set as the correction amount ΔS.

It is also possible to carry out an arithmetic mean of 10 pieces of data as they are to obtain the correction amount ΔS without removing the data of the maximum value and the minimum value. In addition, various methods of calculating the correction amount ΔS are conceivable, and the method is not limited to that of this embodiment (step 105).

In this way, the correction amount ΔS of the drive command S
Is calculated, then the drive command S is corrected using this correction amount ΔS.

In this case, the method of correcting the drive command S differs depending on whether the correction amount ΔS is overrun or underrun.

That is, when the correction amount ΔS has a positive polarity, it is determined that the past successful positioning was performed by the overrun (+), the overrun is eliminated, and the slide 1 is targeted. In order to move to the position Pd, the movement amount of the slide 1 is reduced by the correction amount ΔS, and the drive command for the motor 1 is turned off by the correction amount ΔS before (see reference numeral 6 in FIG. 2). On the other hand, when the correction amount ΔS has a negative polarity, it is determined that the positioning at the time of past success was made by the underrun (-), and the underrun is eliminated,
In order to set the slide 1 to the target value Pd, the movement amount of the slide 1 is increased by the correction amount ΔS, and the drive command for the motor 1 is turned off by the correction amount ΔS at a distance (see reference numeral 7 in FIG. 2). It turns out that you will succeed.

Therefore, the correction drive command value S ′ such as ΔS>0; S ′ = S−ΔS ΔS <0; S ′ = S + ΔS (3) is obtained (step 1
06).

Therefore, the correction drive command S'is output from the controller 3 to the adjustment motor 4. As a result, the motor 4 is driven by the correction drive amount S ′, the slide 1 is moved by the amount of movement corresponding thereto, and the slide 1 is positioned at the target position Pd. At this time, the drive command is
Since it is corrected based on the amount of overrun and underrun at the latest past success, the motor 4
The fluctuations in the load and the like are effectively removed, and the repositioning can be successful in one time (step 102).

[0035]

As described above, according to the present invention, the drive command for the motor is corrected on the basis of the overrun amount or the underrun amount at the time of successful positioning, so that the steady fluctuation due to the secular change is eliminated. It can be effectively removed, the repositioning can be successful in one time, and the die height can be adjusted efficiently.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a die height adjusting device for a press machine according to the present invention.

FIG. 2 is a diagram conceptually showing how the slide position shown in FIG. 1 deviates from a target position.

FIG. 3 is a flowchart showing a processing procedure performed by the controller shown in FIG.

4 is a diagram showing the contents of a memory table stored in the controller shown in FIG.

[Explanation of symbols]

1 slide 3 controller 4 Adjust motor 5 encoder

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B30B 15/06

Claims (2)

(57) [Claims] 1. A drive command according to a target position of a slide is applied to a motor for driving a slide of a press machine,
In a die height adjusting device of a press machine that adjusts the die height by moving the slide up and down according to the drive of the motor and positioning the slide at the target position, the slide is moved every time the slide is positioned. And a predetermined second threshold value smaller than the target position and a predetermined second threshold value larger than the target position for determining the positioning success. Setting means for setting as a value, and every time the slide is positioned, the slide position detected by the detecting means is within a predetermined range of the first threshold value or more and the second threshold value or less. And a determination unit that determines whether or not the detected slide position is within the predetermined range by the determination unit. A storage unit that stores the deviation between the id position and the target position as correction data in association with the number of times of positioning; and when the determination unit determines that the detected slide position is outside the predetermined range. And a correction unit that corrects the drive command based on the latest predetermined number of correction data stored in the storage unit, and outputs the drive command corrected by the correction unit to the motor. , A die height adjusting device of a press machine adapted to reposition the slide. 2. The drive command is a drive amount of the motor set according to the size of the target position of the slide, and the correction means sets the maximum value and the minimum value from among the latest predetermined number of deviations. When the slide is positioned at a position larger than the target value, the arithmetic mean value of the remaining deviations after removing the value is obtained, and the drive command is obtained by subtracting the arithmetic mean value from the motor drive amount. If the slide is positioned at a position smaller than the target value,
2. The die height adjusting device for a press machine according to claim 1, wherein the drive command is corrected by adding the arithmetic mean value to the motor drive amount.