JP2020185596A - Press device, and load abnormality detection method and load abnormality detection program of press device - Google Patents

Abstract

To detect abnormality of an eccentric load over the whole stroke area with simple calculation compared to conventional calculation.SOLUTION: A press device 1 includes a slide 18 that is supported by a frame and is advanceable and retreatable in a vertical direction, load meters 31 which are individually provided on both right and left sides astride a press center Pc in the frame and measure each load in the vertical direction, and a control part 53. The control part 53 calculates an actual measurement load ratio in a lateral direction based on the load measured by the load meter 31, and determines that load abnormality has occurred when the actual measurement load ratio exceeds an acceptable load ratio according to a stroke position of the slide 18.SELECTED DRAWING: Figure 4

Description

The present invention relates to a press device, a load abnormality detection method for the press device, and a load abnormality detection program.

In the press device, the press load acting during operation is monitored. For example, by measuring the load acting on the frame and comparing it with the maximum allowable press load according to the stroke position, abnormality detection of the press load over the entire stroke is performed.

Further, when performing multi-process molding with a plurality of dies, an eccentric load from the center of the press may become a problem.
Therefore, for example, in the press system described in Patent Document 1, the eccentricity amount is calculated based on the load acting on the left and right frames, and the press load allowable value based on the eccentricity amount is compared with the measured load. An abnormality in the eccentric load is detected.

Japanese Unexamined Patent Publication No. 2016-209887

However, the technique described in Patent Document 1 requires a relatively complicated calculation of calculating the eccentricity amount and then calculating the press load allowable value based on the eccentricity amount. Further, it cannot be said that the change in the eccentric load generated during the stroke can be appropriately considered only by using the load acting on the left and right frames during the stroke. That is, it cannot be said that the abnormality of the eccentric load can be appropriately detected over the entire stroke.

An object of the present invention is to detect an abnormality of an eccentric load over the entire stroke by a simple calculation as compared with the conventional case.

The press device according to the present invention is
A slide that is supported by the frame and can move forward and backward in the specified press direction,
A load measuring means that is individually provided on both side portions of the frame across the press center in the first direction in a plane orthogonal to the press direction and measures the load in the press direction.
An actually measured load ratio calculating means that calculates an actually measured load ratio with respect to the first direction based on the load measured by the load measuring means, and
An abnormality detecting means for determining that a load abnormality has occurred when the actually measured load ratio calculated by the actually measured load ratio calculating means exceeds a predetermined allowable load ratio according to the stroke position of the slide.
Is configured to include.

The load abnormality detection method of the press device according to the present invention is
A load abnormality detection method for a press device that is supported by a frame and has a slide that can move forward and backward in a predetermined press direction.
Load measuring means for measuring the load in the pressing direction are individually provided on both side portions of the frame across the press center in the first direction in the plane orthogonal to the pressing direction.
The control means of the press device is
Based on the load measured by the load measuring means, the measured load ratio calculation step of calculating the measured load ratio in the first direction, and the measured load ratio calculation step.
An abnormality detection step of determining that a load abnormality has occurred when the actually measured load ratio calculated in the actually measured load ratio calculation step exceeds a predetermined allowable load ratio according to the stroke position of the slide.
Is to execute.

The load abnormality detection program of the press device according to the present invention is
A load abnormality detection program for a press device that is supported by a frame and has a slide that can move forward and backward in a predetermined press direction.
Load measuring means for measuring the load in the pressing direction are individually provided on both side portions of the frame across the press center in the first direction in the plane orthogonal to the pressing direction.
The control means of the press device
An actually measured load ratio calculating means that calculates an actually measured load ratio with respect to the first direction based on the load measured by the load measuring means.
An abnormality detecting means for determining that a load abnormality has occurred when the actually measured load ratio calculated by the actually measured load ratio calculating means exceeds a predetermined allowable load ratio according to the stroke position of the slide.
It functions as.

According to the present invention, it is possible to detect an abnormality of the eccentric load over the entire stroke by a simple calculation as compared with the conventional case.

It is a figure which shows the apparatus main body of the press apparatus which concerns on this embodiment, (a) is a front view, (b) is a plan view. It is a block diagram which shows the schematic control structure of the press apparatus which concerns on this embodiment. (A) It is a figure which shows an example of the maximum press load data, (b) is a figure which shows an example of an allowable eccentric load data. It is a flowchart which shows the flow of the load abnormality detection processing in this embodiment. (A) It is a figure which shows an example of the change of the load ratio with respect to a stroke position, (b) is a figure which shows an example of the change of the total press load with respect to a stroke position.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Composition of press equipment]
1A and 1B are views showing an apparatus main body 100 of the press apparatus 1 according to the present embodiment, in which FIG. 1A is a front view and FIG. 1B is a plan view.
As shown in FIG. 1A, the press device 1 according to the present embodiment is a forging press device that performs forging molding, and includes an apparatus main body 100. The apparatus main body 100 includes a bed 23, four uprights 22, a crown 21, a bolster 24, a slide 18, a drive unit 10, a movement amount measuring instrument 30, and four load meters 31.

The bed 23, the four uprights 22 and the crown 21 form the frame of the press device 1. The bed 23 and the crown 21 are each formed in a square flat plate shape with four sides along the front, back, left and right, and the four uprights 22 are erected at the four corners of the bed 23 and the crown 21 in the front, back, left and right (FIG. 1 (b). )reference). The beds 23, the four uprights 22, and the crown 21 are fastened to each other by inserting a tie rod 25a into the bed and tightening the tie rod nut 25b.

The bolster 24 is fixed on the bed 23, and a plurality of lower molds 20D are fixed on the bolster 24.
The slide 18 is supported by guides 19 provided on each of the four uprights 22 so as to be able to move forward and backward in the vertical direction. A plurality of upper molds 20U are fixed to the lower part of the slide 18. The plurality of upper molds 20U and the plurality of lower molds 20D form a pair corresponding to each other, and are arranged along the left-right direction, respectively, and face each other vertically. As the slide 18 descends, the upper die 20U and the lower die 20D come close to each other, and the object to be formed is forged between them.
A transfer feeder 40 is provided in the vicinity of the upper mold 20U and the lower mold 20D. When the upper mold 20U and the lower mold 20D are separated from each other, the transfer feeder 40 supplies a new molding material to the upper mold 20U and the lower mold 20D on the most upstream side, or is arranged in the left-right direction. The object to be molded is sequentially conveyed to the plurality of sets of the upper mold 20U and the lower mold 20D.

The drive unit 10 includes a motor 11, a transmission shaft 12, a speed reducer 13, an eccentric shaft 14, and a connecting rod 15. The drive unit 10 is supported by a frame such as a crown 21. The eccentric shaft 14 is arranged so as to extend along the left-right direction. When the motor 11 is driven, the rotational motion of the motor 11 is transmitted in the order of the transmission shaft 12, the speed reducer 13, and the eccentric shaft 14, and the rotational motion of the eccentric shaft 14 is converted into the translational motion of the slide 18 via the connecting rod 15. Will be done. As a result, the slide 18 moves back and forth in the vertical direction.

The movement amount measuring device 30 is provided on, for example, the guide 19 and measures the movement amount of the slide 18. The movement amount measuring device 30 outputs the measured movement amount to the control device 50 described later.
The movement amount measuring instrument 30 is for detecting the position (stroke position) of the slide 18 in the vertical stroke. Therefore, instead of the movement amount measuring device 30, a rotation amount measuring device for measuring the rotation amount (rotation angle) of the eccentric shaft 14 which can acquire the same information may be provided.

As shown in FIG. 1B, the four load meters 31 are provided on each of the four uprights 22 on the front, back, left and right. Each load meter 31 measures, for example, the amount of strain of the attached upright 22, measures the load in the vertical direction acting on the upright 22, and outputs the measurement result to the control device 50 described later.
In the following description, with respect to the symbols of the four load meters 31, the left side "L" or the right side "R" and the front side "F" or the rear side are subscripts indicating the plane positions in the apparatus main body 100. A "B" on the side is attached to identify the plane position.

FIG. 2 is a block diagram showing a schematic control configuration of the press device 1.
As shown in this figure, the press device 1 includes a control device 50 that controls the operation of the device main body 100.
The control device 50 includes an alarm unit 51, a storage unit 52, and a control unit 53.
Of these, the alarm unit 51 outputs an alarm to notify an abnormality of the device main body 100. The alarm mode of the alarm unit 51 is not particularly limited, and for example, an alarm display is output to a display (not shown) or an alarm sound is output from a speaker (not shown).

The storage unit 52 is a memory that stores programs and data for realizing various functions of the apparatus main body 100 and also functions as a work area. In the present embodiment, the storage unit 52 stores the load abnormality detection program 520, the maximum press load data 521, and the allowable eccentric load data 522 in advance.
Of these, the load abnormality detection program 520 is a program for executing the load abnormality detection process (see FIG. 4) described later.

As shown in FIG. 3A, the maximum press load data 521 shows the relationship between the vertical distance from the bottom dead center of the slide 18 (that is, corresponding to the stroke position) and the allowable maximum press load Fmax at that time. It is the data to represent. The maximum allowable press load Fmax is the maximum load value on the mechanical strength that the press device 1 can withstand.

As shown in FIG. 3B, the permissible eccentric load data 522 is data showing the relationship between the eccentricity of the load center from the press center Pc and the permissible press load at that time. The allowable eccentric load data 522 includes the allowable eccentric load data 522a regarding the left-right eccentric amount and the allowable eccentric load data 522b regarding the front-rear eccentric amount. Here, the "load center" means the center of gravity of the load (load) acting on the slide 18. Further, the "press center Pc" represents the center position of the slide 18 on a plane orthogonal to the moving direction (vertical direction) of the slide 18, and corresponds to the center of the quadrilateral connecting the centers of the four tie rods 25a (FIG. 1 (b)).
The allowable eccentric load data 522 may include at least the maximum left-right eccentricity Lf1 and the front-rear eccentricity Lf2 that can tolerate the maximum press load.
The data formats of the maximum press load data 521 and the allowable eccentric load data 522 are not particularly limited, and may be, for example, a functional expression or a data table.

The control unit 53 centrally controls each unit of the press device 1. Specifically, as shown in FIG. 2, the control unit 53 controls the operation of the motor 11 and the transfer feeder 40, and the device main body 100 is based on the outputs from the movement amount measuring instrument 30 and the four load meters 31. Detects load abnormalities.

[Load abnormality detection processing]
Subsequently, a load abnormality detection process for detecting an abnormality in the load acting on the slide 18 will be described.
FIG. 4 is a flowchart showing the flow of load abnormality detection processing.

The load abnormality detection process is a process for detecting an abnormality in the load acting on the slide 18 during the operation (press process) of the press device 1. This load abnormality detection process is executed, for example, when the operation of the press device 1 is started, the control unit 53 reads the load abnormality detection program 520 from the storage unit 52 and deploys it.

As shown in FIG. 4, when the load abnormality detection process is executed, the control unit 53 first measures the stroke position of the slide 18 and the load values acting on the four uprights 22 (step S1). Specifically, the control unit 53 measures the stroke position of the slide 18 based on the output from the movement amount measuring device 30, and the load acting on the four uprights 22 based on the output from the four load meters 31. Measure the value. At this time, if the measured load value is negative, remeasurement or the like may be performed assuming that a measurement error has occurred.
In the following description, a subscript indicating the plane position of each load meter 31 is subscripted to the alphabet F to represent the load value measured by the load meter 31. That is, it is assumed that the load meter 31RF measures the load F _RF , the load meter 31 _RB measures the load F _RB , the load meter 31 _LF measures the load FL F, and the load meter 31 _LB measures the load FL B (FIG. 1 (b)). reference).

Next, the control unit 53 determines whether the total press load F (= F _RF + F _RB + F _LF + F _LB ) of the measured values exceeds the allowable maximum press load Fmax based on the stroke position measured in step S1 and each load value. Whether or not it is determined (step S2). The allowable maximum press load Fmax is used after obtaining a value corresponding to the measured stroke position based on the maximum press load data 521.
Then, when it is determined that the total press load F exceeds the allowable maximum press load Fmax (step S2; Yes), the control unit 53 shifts the process to step S6 described later.
In this step, in addition to the determination of the total press load F, a determination may be made in which the four measured loads F _RF , F _RB , F _LF , and F _LB are individually compared with a predetermined threshold value.

ここで、
L1：タイロッド２５ａの左右ピッチの半分（図１（ｂ）参照）
L2：タイロッド２５ａの前後ピッチの半分（図１（ｂ）参照）
Lf1：最大プレス荷重を許容できる最大の左右偏心量（図３（ｂ）参照）
Lf2：最大プレス荷重を許容できる最大の前後偏心量（図３（ｂ）参照）
である。
L1、L2は予め設定された既知の値であり、Lf1、Lf2は許容偏心荷重データ５２２から求められる。
なお、式１又は式２において分母がマイナスになった場合、計算エラーが発生したとして、ステップＳ１へ処理を戻したり処理を中断したりしてもよい。 When it is determined in step S2 that the total press load F does not exceed the maximum allowable press load Fmax (step S2; No), the control unit 53 determines the allowable load based on the stroke position and each load value measured in step S1. The ratio (allowable load ratio) is calculated (step S3).
Specifically, in this step, the allowable load ratio RRL1 in the left-right direction and the allowable load ratio RFB1 in the front-rear direction are calculated by the following equations 1 and 2.

here,
L1: Half of the left and right pitch of the tie rod 25a (see FIG. 1 (b))
L2: Half of the front-rear pitch of the tie rod 25a (see Fig. 1 (b))
Lf1: Maximum left-right eccentricity that can tolerate the maximum press load (see Fig. 3 (b))
Lf2: Maximum amount of anteroposterior eccentricity that can tolerate the maximum press load (see Fig. 3 (b))
Is.
L1 and L2 are preset known values, and Lf1 and Lf2 are obtained from the allowable eccentric load data 522.
If the denominator becomes negative in Equation 1 or Equation 2, the process may be returned to step S1 or the process may be interrupted, assuming that a calculation error has occurred.

Here, the allowable load ratio is the ratio (load ratio) of the load acting on the upright 22 (frame) to the left, right, or front and back, and is the maximum value that can be theoretically (designed) tolerated. This allowable load ratio is derived from the balance of the moment around the press center Pc.
Specifically, the derivation of Equation 1 is based on the equation for balancing the moments in the left-right direction around the press center Pc.
F _Left x L1-F _Right x L1 = Fmax x Lf1 (F _Left = F _LF + F _LB , F _Right = F _RF + F _RB )
From this formula and F _Left + F _Right = F
2 (F _Left x L1) / F = L1 + (Fmax x Lf1) / F
2 (F _Right x L1) / F = L1- (Fmax x Lf1) / F
Is obtained.
Then, by applying these equations to RRL1 = F _Left / F _Right , the above equation 1 can be obtained.
As a result, the allowable load ratio according to the stroke position of the slide 18 is calculated.

Similarly, the derivation of Equation 2 is based on the equation for balancing the moment in the front-back direction around the press center Pc.
F _Front x L2-F _Rear x L2 = Fmax x Lf2 (F _Front = F _RF + F _LF , F _Rear = F _RB + F _LB )
From this formula and F _Front + F _Rear = F
2 (F _Front x L2) / F = L2 + (Fmax x Lf2) / F
2 (F _Rear x L2) / F = L2- (Fmax x Lf2) / F
Is obtained.
Then, by applying these equations to RFB1 = F _Front / F _Rear , the above equation 2 can be obtained.

ここで、算出したRRL2、RFB2が１より小さい場合には、その逆数に置き換える。
また、算出したRRL2、RFB2が、理論上のダイスペース寸法を超えるような各々の所定の閾値よりも大きかった場合、計算エラーが発生したとして、ステップＳ１へ処理を戻したり処理を中断したりしてもよい。 Next, the control unit 53 calculates the actually measured load ratio (measured load ratio) based on each load value measured in step S1 (step S4).
Specifically, in this step, the measured load ratio RRL2 in the left-right direction and the measured load ratio RFB2 in the front-rear direction are calculated by the following equations 3 and 4.

Here, if the calculated RRL2 and RFB2 are smaller than 1, they are replaced with their reciprocals.
Further, when the calculated RRL2 and RFB2 are larger than the respective predetermined threshold values that exceed the theoretical die space dimension, it is considered that a calculation error has occurred, and the process is returned to step S1 or the process is interrupted. You may.

Next, the control unit 53 determines whether or not the actually measured load ratio calculated in step S4 exceeds the allowable load ratio calculated in step S3 (step S5).
Specifically, the control unit 53 determines whether or not at least one of RRL2> RRL1 and RFB2> RFB1 is satisfied.
Then, when it is determined that the actually measured load ratio does not exceed the allowable load ratio (step S5; No), the control unit 53 shifts the process to step S7 described later.

Further, when it is determined in step S5 that the measured load ratio exceeds the allowable load ratio (step S5; Yes), or when it is determined in step S2 above that the total press load F exceeds the allowable maximum press load Fmax (step S2). Yes), the control unit 53 determines that a load abnormality has occurred, and operates the alarm unit 51 to notify the occurrence of the load abnormality (step S6).
At this time, the notification mode may be changed according to the detection content (abnormality of total press load, abnormality of load ratio, or abnormality of front / rear or left / right in case of load ratio), and the device main body 100 may be notified together with the notification. The operation may be stopped.

Next, the control unit 53 determines whether or not to end the load abnormality detection process (step S7), and if it determines that the load abnormality detection process is not terminated (step S7; No), the process shifts to the above-mentioned step S1. , Continue detecting load abnormalities.
Then, when it is determined that the load abnormality detection process is terminated due to, for example, the end of the operation of the apparatus main body 100 (step S7; Yes), the control unit 53 ends the load abnormality detection process.

[Technical effect of this embodiment]
As described above, according to the present embodiment, the load meters 31 are individually provided on the left and right side and the front and rear side uprights 22 of the frame supporting the slide 18, and the load measured by the load meter 31 is applied. Based on this, the measured load ratio for each of the left-right direction and the front-back direction is calculated. Then, when the actually measured load ratio exceeds the allowable load ratio according to the stroke position of the slide 18, it is determined that a load abnormality has occurred.
Therefore, unlike the conventional method in which the permissible press load value is calculated based on the eccentricity amount, by using the load ratio (load ratio), a simple calculation using only the load as a variable is sufficient. Therefore, it is possible to detect an abnormality of the eccentric load in the left-right direction and the front-rear direction over the entire stroke by a simple calculation as compared with the conventional case.
Further, since the eccentric load in the front-rear direction as well as the left-right direction can be monitored, the device main body 100 can be protected more reliably.
Furthermore, when monitoring the eccentric load, it is not necessary to measure the eccentricity in kind or input it to the device. That is, since the eccentric load can be monitored regardless of the forged product or the forging plan, it is possible to provide the press device 1 with higher versatility.

Further, according to the present embodiment, in addition to the abnormality detection of the eccentric load, the abnormality detection of the total press load F for determining that the load abnormality has occurred when the total press load F exceeds the allowable maximum press load Fmax is also performed. Will be.
As a result, the device main body 100 can be protected more reliably.

[Modification example]
In step S5 described above, it was decided to determine the abnormality of the eccentric load by comparing the measured load ratio with the allowable load ratio.
However, as shown in FIG. 5A, in combination with (or instead of) this comparison, the measured load ratio may be compared with the predetermined allowable range Gr to determine the abnormality of the eccentric load. The permissible range Gr is the one in which the permissible range is set for the load ratio (vertical axis) and the stroke position (horizontal axis) with respect to the basic waveform of the sound load ratio in the entire stroke range (or a predetermined stroke range) acquired in advance. is there. At this time, the permissible range of the stroke position is, for example, a variation in the weight (size) of a plurality of molding materials continuously produced during operation, and a variation in the stroke position (permissible range) based on this variation. You may decide. The stroke position on the horizontal axis in the figure indicates that the minus side is descending and the press side is ascending. The broken line in the figure shows an example of the allowable load ratio.
By acquiring the allowable range Gr of such a load ratio in advance and storing it in the storage unit 52 and determining whether or not the calculated measured load ratio is within this allowable range Gr, an abnormality in the eccentric load can be detected. It may be detected. As a result, the abnormality of the eccentric load can be detected with higher accuracy.

Further, the comparison between the actually measured load ratio and the allowable load ratio in step S5 may be performed only at a predetermined singular point in the stroke. The singular point is a point where the load ratio is likely to change during the stroke of the slide 18 (that is, an eccentric load abnormality is likely to become apparent), and the rising point D1 which is the starting point of crushing when the molding material comes into contact with the mold, molding. It contains at least one of a tilt change point D2 and a bottom dead center peak load point D3 where the material fills the mold.
By comparing and determining the measured load ratio and the allowable load ratio only at such singular points, it is possible to reduce the amount of calculation processing while detecting the abnormality of the eccentric load with good accuracy. However, in this case, it is necessary to detect the singular point by, for example, detecting the amount of change in the load ratio with respect to the amount of change in the stroke position.

Further, in the comparison between the total press load F and the maximum allowable press load Fmax in step S2 described above, the total press load F is compared with the predetermined allowable range Gr as in the case of comparing the load ratio in step S5 described above. You may. That is, in combination with (or instead of) the comparison between the total press load F and the maximum allowable press load Fmax, the total press load F is compared with the predetermined allowable range Gr as shown in FIG. 5 (b). , The abnormality of the total press load F may be determined. The permissible range Gf of the total press load F is the total press load F (vertical axis) and the stroke position (horizontal axis) with respect to the basic waveform of the sound total press load F over the entire stroke (or a predetermined stroke range) acquired in advance. The permissible range is set for each. As a result, the abnormality of the total press load F can be detected with higher accuracy.
Further, the comparison between the total press load F and the maximum allowable press load Fmax may be performed only at a predetermined singular point during the stroke, as in the case of comparing the load ratios. Also in this case, it is possible to reduce the amount of calculation processing while detecting the abnormality of the total press load with good accuracy.

Further, the eccentric load in the front-rear direction is sufficiently smaller than the eccentric load in the left-right direction, which is the axial direction of the eccentric shaft 14 and also the arrangement direction of the plurality of upper molds 20U and lower molds 20D. Therefore, it is possible to simply assume that the load values before and after the device are the same (that is, F _RF = F _RB , F _LF = F _LB ), and omit the calculation of _RF B1 and RF B 2 and their comparison. In this case, either the load meters 31RF or 31RB on the right side and the load meters 31LF or 31LB on the left side may not be present. That is, at least one load meter 31 is provided on each of the uprights 22 on both the left and right sides across the press center Pc, the measured load ratio in the left-right direction is calculated from the measured value, and an abnormality in the eccentric load in the left-right direction is detected. I hope I can.
Furthermore, the direction of the comparison in the load ratio (load ratio) to be monitored is not limited to the left-right direction or the front-back direction, and includes any one direction in the plane orthogonal to the press direction (vertical direction). Good. Then, it suffices if an abnormality of the eccentric load in at least one direction can be detected.

[Other]
Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.
For example, in the above embodiment, the load ratio (load ratio) is obtained by using the load meter 31 provided on the upright 22 (frame), but since the load ratio in a predetermined direction acting on the slide 18 can be obtained. If there is, the position of the load meter 31 and the member to be attached thereof are not particularly limited. That is, the load meter 31 may be provided on both sides of the member in which the distribution of the press load acting on the slide 18 is reflected, at least straddling the press center Pc in the predetermined direction.

Further, in the above embodiment, the case where the advancing / retreating direction (pressing direction) of the slide 18 is the vertical direction has been described, but the pressing direction may be a direction other than the vertical direction. However, in this case, the direction of viewing the load ratio (load ratio) is a direction in a plane orthogonal to the press direction, and it is necessary to provide load gauges 31 on both side portions straddling the press center in that direction.

Further, the drive mechanism of the press device according to the present invention is not particularly limited. For example, the motor 11 does not drive the transmission shaft 12, but the transmission shaft (eccentric shaft) is driven by the rotational energy stored in the flywheel. It may be a thing or the like.
In addition, the details shown in the above-described embodiment can be appropriately changed without departing from the spirit of the invention.

1 Press device 14 Eccentric shaft 18 Slide 20D Lower mold 20U Upper mold 22 Upright 25a Tie rod 30 Movement amount measuring instrument 31 (31RF, 31RB, 31LF, 31LB) Load meter 50 Control device 51 Alarm unit 52 Storage unit 53 Control unit 100 Device body 520 Load abnormality detection program 521 Maximum press load data 522 Allowable eccentric load data F Total press load Fmax Allowable maximum press load Lf1 Left and right eccentric amount Lf2 Front and rear eccentric amount Pc Press center RFB1 Allowable load ratio in front and back direction RFB2 Actual measurement in front and back direction Load ratio RRL1 Allowable load ratio in the left-right direction RRL2 Measured load ratio in the left-right direction

Claims (10)

A slide that is supported by the frame and can move forward and backward in the specified press direction,
A load measuring means that is individually provided on both side portions of the frame across the press center in the first direction in a plane orthogonal to the press direction and measures the load in the press direction.
An actually measured load ratio calculating means that calculates an actually measured load ratio with respect to the first direction based on the load measured by the load measuring means, and
An abnormality detecting means for determining that a load abnormality has occurred when the actually measured load ratio calculated by the actually measured load ratio calculating means exceeds a predetermined allowable load ratio according to the stroke position of the slide.
To prepare
Press equipment. A position measuring means for measuring the stroke position of the slide and
Based on the stroke position of the slide measured by the position measuring means and the load measured by the load measuring means, the allowable equation for the first direction is used by using the balance equation of the moment in the first direction around the center of the press. Allowable load ratio calculation means for calculating load ratio and
To prepare
The press device according to claim 1. A storage means for storing in advance the maximum press load data showing the relationship between the stroke position of the slide and the maximum allowable press load of the frame and the maximum allowable eccentricity in the first direction that allows the maximum press load. ,
The allowable load ratio calculation means is
From the maximum press load data, the allowable maximum press load at the measured stroke position of the slide is obtained.
The allowable load ratio is calculated based on the allowable maximum press load, the allowable maximum eccentricity amount, and the load measured by the load measuring means.
The press device according to claim 2. The abnormality detecting means compares the measured load ratio with the allowable load ratio only at a predetermined singular point where the load ratio is likely to change during the stroke of the slide.
The press device according to any one of claims 1 to 3. The singularity includes at least one of a molding material contacting the mold, a molding material filling the mold, and a bottom dead center of the slide.
The press device according to claim 4. The load measuring means is provided on both side portions of the frame straddling the press center in the first direction and both side portions straddling the press center in the second direction orthogonal to the first direction in the plane. Be,
The measured load ratio calculating means individually calculates the actually measured load ratio in the first direction and the actually measured load ratio in the second direction based on the load measured by the load measuring means.
The abnormality detecting means is used when the measured load ratio in the first direction exceeds the allowable load ratio in the first direction, or the measured load ratio in the second direction exceeds the allowable load ratio in the second direction. Judge that a load abnormality has occurred,
The press device according to any one of claims 1 to 5. A load calculating means for calculating the total press load acting on the frame based on the load measured by the load measuring means, and
When the total press load exceeds the maximum allowable press load according to the stroke position of the slide, other abnormality detecting means for determining that a load abnormality has occurred, and
To prepare
The press device according to any one of claims 1 to 6. The first direction is a direction along the eccentric axis that advances and retreats the slide in the press direction.
The press device according to any one of claims 1 to 7. A load abnormality detection method for a press device that is supported by a frame and has a slide that can move forward and backward in a predetermined press direction.
Load measuring means for measuring the load in the pressing direction are individually provided on both side portions of the frame across the press center in the first direction in the plane orthogonal to the pressing direction.
The control means of the press device is
Based on the load measured by the load measuring means, the measured load ratio calculation step of calculating the measured load ratio in the first direction, and the measured load ratio calculation step.
An abnormality detection step of determining that a load abnormality has occurred when the actually measured load ratio calculated in the actually measured load ratio calculation step exceeds a predetermined allowable load ratio according to the stroke position of the slide.
To execute,
How to detect load abnormality in press equipment. A load abnormality detection program for a press device that is supported by a frame and has a slide that can move forward and backward in a predetermined press direction.
Load measuring means for measuring the load in the pressing direction are individually provided on both side portions of the frame across the press center in the first direction in the plane orthogonal to the pressing direction.
The control means of the press device
An actually measured load ratio calculating means that calculates an actually measured load ratio with respect to the first direction based on the load measured by the load measuring means.
An abnormality detecting means for determining that a load abnormality has occurred when the actually measured load ratio calculated by the actually measured load ratio calculating means exceeds a predetermined allowable load ratio according to the stroke position of the slide.
To function as
Load abnormality detection program for press equipment.

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