JP3456460B2 - Rolling abnormality detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a factor that causes a rolling abnormality when inserting a mandrel bar into a hollow shell in a mandrel mill rolling or at an initial stage of rolling, and thus prevents rolling trouble from occurring. The present invention relates to a rolling abnormality detection device for preventing the rolling abnormality.

[0002]

2. Description of the Related Art As a method for producing a seamless steel pipe, a method using a mandrel mill is known. In this method, a solid round billet heated to a high temperature is made into a hollow shell by a punching machine, a mandrel bar is inserted into this hollow shell, and the hollow shell in this state is rolled to a predetermined size. Pass it through the mandrel mill.

The mandrel mill is a rolling facility in which a plurality of rolling roll stands equipped with caliber rolls are continuously arranged. When the hollow shell passes through the mandrel mill, the outer diameter of the mandrel bar and the inner diameter of the caliber roll are measured. By this, the outer and inner diameters are reduced and stretched to a predetermined size to form a seamless steel pipe.

FIG. 9 shows a general rolling procedure in a mandrel mill at the time of manufacturing a seamless steel pipe. The hollow shell 51 pierced by the piercing machine 50 is transported to the mandrel mill inlet side facility 53A by the transport facility 52. To insert the mandrel bar 54, the hollow shell 51
To the mandrel mill rolling equipment 53.

The mandrel mill inlet side equipment 53A has a mandrel bar driving device 55. The mandrel bar driving device 55 advances the mandrel bar 54 and, for example, by a pinch roll 56 provided as a conveying device for the hollow shell 51. The hollow shell 51 is advanced to feed the hollow shell 51 with the mandrel bar 54 inserted into the first stand 57 of the mandrel mill rolling equipment 53. Then, the hollow shell 51 is rolled in the mandrel mill rolling equipment 53.

In the step of inserting the mandrel bar 54 into the hollow shell 51, when a dimensionally defective material of the hollow shell 51, especially a dimensionally defective material at the tail end is conveyed, or when the mandrel bar 54 is used in the inserting step. Even if the insertion position of the hollow shell 51 is not properly adjusted, an operator who constantly monitors the insertion process can visually detect an abnormality during the insertion process, or the mandrel bar 54 in the insertion process. It will continue automatically until overload is detected.

[0007]

Therefore, in the manufacturing process of the seamless steel pipe, the monitoring by the operator is an important element, but in recent years, the insertion process is constantly monitored by the reduction of personnel due to labor saving. The number of operating operators is also decreasing, and it is difficult to monitor the process of inserting the mandrel bar 54 into the hollow shell 51 by the operator as described above. Further, in the case of detecting the overload of the mandrel bar 54, since it is judged to be abnormal after the overload is detected and the operation is stopped, it often happens that the equipment is already damaged.

On the other hand, in the step of feeding the hollow shell 51 into which the mandrel bar 54 is inserted into the first stand 57, the pinch roll 56 and the outer surface of the hollow shell 51 slide,
In the first stand 57, the hollow shell 51 is bitten late (delayed biting), resulting in defective rolling, or
Mandrel bar 54 by mandrel bar driving device 55
When the hollow shell 51 is pushed out by the pinch roll 56 and the hollow shell 51 is pushed by the mandrel bar 54, the hollow shell 51 is quickly bitten in the first stand 57 (biting in). (Early) Rolling failure may occur.

Both the delay of the biting of the hollow shell 51 and the early biting of the hollow shell 51 result in a poor protrusion length of the mandrel bar 54 and the hollow shell 51. The protrusion length defect means that the distance between the tip of the mandrel bar 54 when the hollow shell 51 is bitten into the first stand 57 and the center of the first stand 57 is deviated from the setting. Yes,
If the protrusion length defect occurs, rolling defect occurs.

Conventionally, for example, in Japanese Patent No. 2897700, strict control of the protrusion length is required so that the application area of the lubricant used for rolling in the mandrel bar is defined in advance. However, excessive bite delay or early bite rolling leads to non-lubricating rolling, and as rolling abnormality, for example, seizure of the mandrel bar, further,
The mismatch between the hollow shell and the setting of the mass flow due to the increase in the friction coefficient of the mandrel bar leads to the breakage of the material and the material stagnation between the rolling stands, which necessitates a long production stoppage.

In order to improve such a problem, in Japanese Patent No. 2636690, it is detected that the mandrel bar is rolled in a state where it is not inserted into the hollow shell, and the protruding length of the next hollow shell is detected. Feedback is made to the set value of. However, this method has a problem that an abnormality cannot be detected unless the first one is rolled, and that it cannot be said that the reproducibility is always accurate.

As described above, conventionally, an abnormality caused by a position error between the hollow shell and the mandrel bar or a dimensional failure of the hollow shell is detected when the mandrel bar is inserted into the hollow shell, and the equipment is damaged. It has not been possible to prevent the trouble that causes the occurrence of rolling, or to prevent the occurrence of defective rolling by detecting the early biting and the delayed biting that cause defective rolling at the initial stage of rolling.

The present invention has been made to solve the above problems, and detects a dimensional defect of a hollow shell and a position error between the mandrel bar and the hollow shell when inserting the mandrel bar into the hollow shell. Or, it is possible to detect an early biting and a biting delay in the initial stage of rolling, and therefore to provide a rolling abnormality detection device capable of preventing serious troubles and rolling defects leading to equipment damage. To do.

[0014]

In order to achieve the above object, the rolling anomaly detecting device of the present invention comprises a load torque detecting means for detecting a load torque when a mandrel bar is driven, or a mandrel bar inserted into a hollow shell. When the mandrel bar is inserted into the hollow shell, the mandrel bar is equipped with a load detecting means for detecting an insertion load applied to the mandrel bar when the mandrel bar is compared with the detected load torque signal or the load signal. Poor position of bar and hollow shell,
This is to detect dimensional defects of the hollow shell.

Further, the rolling abnormality detecting device of the present invention comprises position detecting means for detecting the mandrel bar position and bite detecting means for detecting that the hollow shell has been bitten by the first stand of the mandrel mill. By comparing the mandrel bar position when the hollow shell with the mandrel bar inserted into the first stand is bitten with a preset range, early biting and biting delay are detected in the initial rolling stage. It is a thing.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rolling anomaly detection apparatus according to claim 1 of the present invention detects rolling anomalies when a mandrel bar is inserted into a hollow shell in Mannesmann-mandrel mill rolling. A device, which is provided in a drive device that drives a mandrel bar, is provided in a load torque detection means that detects a load torque when the mandrel bar is driven, or in a holding device that holds the mandrel bar, and the mandrel bar is a hollow element. A load detecting means for detecting a load applied to the mandrel bar when the tube is inserted into a pipe, and a comparing means for comparing a signal level detected by the load torque detecting means or the load detecting means with a preset threshold value, And a control means for stopping and controlling the drive device when the comparison means determines that the threshold value is exceeded.

When the mandrel bar is inserted into the hollow shell by the driving device, the load torque signal detected by the load torque detecting means is output to the comparing means. The comparison means sets a threshold value for the load torque signal and compares the threshold value with the load torque signal.

If the positions of the mandrel bar and the hollow shell are not proper, or if the dimensions of the hollow shell are not proper, the load torque signal exceeds the threshold value, and at this time, the comparison means controls to that effect. Output to the means. Then, the control means immediately controls to stop the driving device of the mandrel bar.

For example, in the load torque signal, when the mandrel bar is inserted into the hollow shell, it is in a constant speed state or an acceleration state. The load torque referred to here is the acceleration torque removed from the total drive torque. Therefore, whether the load torque signal level exceeds the threshold value or not can be detected accurately in both the acceleration state and the constant speed state.

Further, instead of the above load torque detecting means, the load detecting means provided in the holding device for holding the mandrel bar detects the insertion load applied to the mandrel bar when inserting the mandrel bar into the hollow shell. However, even when the comparison means is configured to compare the load signal from the load detection means with the threshold value, it is possible to obtain the same effect as the above.

In the load torque signal or the load signal, the threshold value is divided according to the operation schedule of the dimensions of the mandrel bar and the hollow shell, for example, for each outer diameter of the final stand of the mandrel mill rolling equipment. It is set as a level that will not be over-detected in actual manufacturing.

As described above, by detecting the state in which the mandrel bar is caught at the tip of the hollow shell or the state in which the mandrel bar is not correctly inserted into the hollow shell, serious troubles that may cause equipment damage can be prevented. be able to.

Further, the rolling anomaly detection apparatus according to claim 2 of the present invention is characterized in that in the initial stage of rolling the hollow shell with the mandrel bar inserted in the Mannesmann-mandrel mill rolling,
A rolling abnormality detecting device for detecting a factor causing a rolling abnormality, which detects position of a mandrel bar inserted in the hollow shell and position of the hollow shell caught in the first stand. The bite detection means and the mandrel bar position when the bite detection means detects that the hollow shell has been bitten into the first stand are
Comparing means for comparing the inside and outside of a preset range, and calculating and predicting the mandrel bar position corresponding to when the hollow shell is normally bitten into the first stand, and includes the predicted position. As described above, the mandrel bar positions at a certain time earlier and later are set as a range and given to the comparison means, and the rolling control is stopped when the comparison means determines that the mandrel bar position is out of the range. And a control means.

According to the above structure, in the rolling abnormality detecting device of the present invention, the bite detecting means detects that the hollow shell is bitten into the first stand, and at this time, the position detecting means is the mandrel. Detect the position of the bar. The comparing means sets the mandrel bar positions when the hollow shell is bitten by the first stand in a normal state by the control means so as to include the mandrel bar positions corresponding to the early time and the late time by a certain time. Has been given.

Then, the comparing means determines that the mandrel bar position is earlier than the range of the constant time and that the bite is early, and when the mandrel bar position is behind the range of the constant time, it is the bite delay and the comparison is made. Output to the control means. The control means immediately stops rolling when the comparison means outputs a determination signal of early biting or delayed biting.

As described above, by detecting the early biting and the biting delay in the initial rolling stage, that is, by detecting the mandrel bar position when the hollow shell is bitten into the first stand of the mandrel mill, the entire hollow shell can be detected. It is possible to prevent rolling failure over a period of time.

Further, the rolling abnormality detecting apparatus according to claim 3 of the present invention is characterized in that when the mandrel bar is inserted into the hollow shell in the Mannesmann-mandrel mill rolling and at the beginning of rolling.
A rolling abnormality detecting device for detecting a factor causing a rolling abnormality, comprising the above-mentioned configuration of claim 1 and configuration of claim 2.

That is, the rolling abnormality detecting device of the present invention is
The load torque detection means or the load detection means for detecting the load, the position detection means, the bite detection means, the comparison means, and the control means are provided. The comparing means in such a configuration compares the signal level detected by the load torque detecting means or the load detecting means with a preset threshold value, and detects that the hollow shell is bitten into the first stand. The mandrel bar position at that time is compared with whether it is inside or outside the preset range.

Further, the control means controls the driving device of the mandrel bar to stop when the comparison means determines that the load torque signal or the load signal exceeds the threshold value, and in the normal state, the hollow shell is set to the first position. The mandrel bar position corresponding to when bitten into one stand is calculated and predicted, and the mandrel bar positions at a certain time earlier and later are set as a range so as to include the predicted position and compared. The control means stops the rolling when the comparison means determines that the mandrel bar position is out of the range.

By doing so, it is possible to detect the factor causing the rolling trouble from the stage of inserting the mandrel bar into the hollow shell to the initial rolling, so that serious trouble can be prevented. Therefore, the rolling is properly performed and the productivity is improved.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rolling anomaly detecting device of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic configuration of a rolling abnormality detecting device according to claim 1 of the present invention. FIG. 2 shows a load torque monitoring situation in the rolling abnormality detecting apparatus according to claim 1 of the present invention. FIG. 3 shows a schematic configuration of a rolling abnormality detecting device according to claim 2 of the present invention. FIG. 4 shows a procedure for detecting an early biting and a biting delay in the rolling abnormality detecting device according to claim 2 of the present invention. FIG. 5 shows the protruding state of the mandrel bar.
FIG. 6 shows the relationship between the mandrel bar position and the time when the hollow shell is bitten by the first stand. Figure 7
Indicates a deviation between the predicted position X1 and the first stand biting position Y in actual operation. FIG. 8 shows a schematic configuration of a rolling abnormality detecting device according to claim 3 of the present invention.

(First Embodiment) A rolling abnormality detecting apparatus according to claim 1 of the present invention will be described with reference to FIGS. 1 and 2. No. 1 is a rolling abnormality of the present invention in which, when the mandrel bar B is inserted into the hollow shell P, the cause of trouble leading to equipment damage is detected by comparing, for example, a load torque signal with a threshold value in the first embodiment. It is a detection device and has the following configuration.

Reference numeral 2 is a mandrel bar driving device for advancing the mandrel bar B in the direction of the mandrel mill S (see FIG. 5). The mandrel bar driving device 2 also has the function of a holding device for holding the mandrel bar B in the first embodiment, for example, and the rack 2A holding the rear end of the mandrel bar B and the pinion gear meshed with the rack 2A. 2B, a rotating machine 2C for rotating the pinion gear 2B, and a drive device 2D for driving the rotating machine 2C.
It has and.

The drive device 2D is configured to detect the load torque of the rotating machine 2C, and the load torque signal from which the acceleration / deceleration component has been removed by the drive device 2D is output to the comparison device 3 described later.

Reference numeral 3 is a comparator which receives the load torque signal of the rotating machine 2C output from the drive unit 2D and compares the load torque signal with a predetermined threshold value.

Reference numeral 4 denotes a control device for immediately stopping and controlling the drive device 2D when an abnormality is detected based on the comparison result of the comparison device 3. The control device 4 controls, for example, each block of the production line. It corresponds to the process computer.

Next, before the mandrel bar B is inserted into the hollow shell P in the rolling anomaly detection apparatus 1 having the above-described structure,
Poor position of mandrel bar B and hollow shell P and hollow shell P
The operation for detecting the dimensional defect will be described.

A threshold value of the load torque signal is given to the comparison device 3 from the control device 4. The threshold value given to the comparison device 3 is, for example, 29 since the load torque in the case of a normal insertion process is usually about 80 kN · m.
It is set to 0 kN · m.

When the mandrel bar B is inserted into the hollow shell P, if the height of the mandrel bar B and the hollow shell P is improper and the mandrel bar B strikes inside the hollow shell P, the mandrel bar B moves to the rotary machine 2C. A load is applied, and as shown in FIG. 2, a high level signal appears in the load torque signal and exceeds the threshold value.

At this time, the comparison device 3 outputs to the control device 4 that the threshold value has been exceeded, and the control device 4 causes the drive device 2 to operate.
Stop D. Alternatively, the control device 4 issues an alarm to that effect by light or sound, and the worker stops the drive device 2D.

When an abnormality is detected when inserting the mandrel bar B into the hollow shell P, the mandrel bar B is quickly separated from the hollow shell P by using the mandrel bar B withdrawing device. The P baking-out treatment is performed. When the mandrel bar B is not inserted into the hollow shell P and the hollow shell P is repelled by the mandrel bar B, the hollow shell P is burned out by a crane.

As described above, when the mandrel bar B is inserted into the hollow shell P, by detecting the position defect between the mandrel bar B and the hollow shell P and the dimension defect of the hollow shell P,
Trouble can be prevented and productivity is improved.

In the first embodiment, the load torque of the rotating machine 2C is detected by the drive device 2D and output to the comparison device 3, but instead of this, a mandrel bar (not shown) is used. By using a load meter provided in a holding device for holding (the mandrel bar driving device 2 also serves as the first embodiment), the insertion load applied to the mandrel bar B when the mandrel bar B is inserted into the hollow shell P is measured. Even if it detects and compares a load signal and a threshold value, the same effect as the above can be obtained.

(Second Embodiment) A rolling abnormality detecting device according to a second aspect of the present invention will be described with reference to FIGS. 3 to 7. 11 is a hollow shell P with a mandrel bar B inserted
The rolling abnormality detecting device of the present invention detects early biting and biting delay, which are factors that cause rolling abnormalities during the entire rolling process, and has the following configuration.

Rolling abnormality detecting apparatus 1 in the second embodiment
1 is a mandrel bar drive device 2 (rack 2A, pinion gear 2B, rotating machine 2C, drive device 2D), and rack 2
The position detector 2E for obtaining the position of the mandrel bar B from the moving amount of A and the roll of the first stand S1 of the mandrel mill S are provided on the hollow shell P by detecting the roll reaction force.
The load measuring device 5 for detecting that the vehicle is bitten into the first stand S1, the comparison device 13, and the control device 14 are provided.

The comparison device 13 in the rolling anomaly detection device 11 of the second embodiment uses the load measuring device 5 for the hollow shell P.
The position of the mandrel bar B when it is detected that the bite is bitten into the first stand S1 is compared with whether it is inside or outside a preset range.

Then, the controller 14 in the rolling abnormality detecting device 11 of the second embodiment calculates the position of the mandrel bar B corresponding to the hollow shell P being bitten into the first stand S1 in the normal state. Then, the position of the mandrel bar B at a time earlier and later than a certain time is set as a range so as to include the predicted position, and the rolling control is stopped based on the comparison judgment of the comparison device 13. .

As shown in FIG. 5, the control unit 14 preliminarily sets the position of the mandrel bar B at the moment when the hollow shell P is bitten into the first stand S1 of the mandrel mill S, that is, the tip position of the mandrel bar B. A prediction (hereinafter referred to as a predicted position X1) is given, and a value obtained by adding or subtracting a range position α of ± 1000 mm as a constant range to the predicted position X1 is given to the comparison device 13.

In order to determine the range position α, FIG. 7 shows a deviation such as how much the actual position is deviated from the predicted position X1. Further, the range position α is adjusted so that the deviation between the detection position Y and the predicted position X1 is confirmed and the level is not excessively detected.

The above-mentioned predicted position X1 is set in the comparison device 13.
In addition to the ± range position α being input, the position signal of the mandrel bar B from the position detector 2E and the biting signal from the load measuring device 5 are input.

Then, when the biting signal from the load measuring device 5 is output, the position of the mandrel bar B is acquired from the position detector 2E, and the comparing device 13 predicts the position of the mandrel bar B at this time. X1 ± range position α is compared and judged.

FIG. 4A shows the early detection of biting, as shown in FIG.
(B) has shown the flow of biting delay detection. The early detection of biting will be described below with reference to FIG. In the comparison device 13, as shown in FIG. 4A, the position of the mandrel bar B by the position detector 2E (hereinafter, the detection position Y
6), when the hollow shell P having the mandrel bar B inserted therein is bitten into the first stand S1 of the mandrel mill S (YES in FIG. 4 (a) # 1), FIG. As shown, when the detected position Y is in front of the predicted position X1−range position α, it is determined that the hollow shell P is pushed and the biting is early (see # 2 in FIG. 4A). YE
S), the fact is output to the control device 14, and the control device 14 stops the rolling (Fig. 4 (a) # 3).

Next, the bite delay detection will be described with reference to FIG. In the comparison device 13, when the detected position Y reaches a position exceeding the predicted position X1 + range position α as shown in FIG. 6D (YES in # 5 of FIG. 4B),
The biting signal in the first stand S1 is the load measuring device 5.
Is not output (NO in # 6 of FIG. 4B),
It is determined that slippage has occurred between the hollow shell P and the pinch roller (not shown) and there has been a biting delay, and this is output to the control device 14, and the control device 14 stops rolling (Fig. 4 (b) #).
8).

When the rolling is stopped, the mandrel bar B is quickly separated from the hollow shell P by using the mandrel bar B withdrawing device, and the hollow shell P is burned out. This work takes only about 10 minutes. For it,
Conventionally, when a rolling defect occurs between the stands of the mandrel mill S, the stoppage time may be as long as 7 hours.

Further, in FIG. 4A, when the hollow shell P is engaged with the first stand S1 (FIG. 4A #).
1), if the detected position Y is Y ≧ predicted position X1−range position α (NO in FIG. 4 (a) # 2), it is determined to be normal and rolling is continued (FIG. 4 (a) # 4). ). Furthermore, FIG.
In FIG. 4B, when the detected position Y exceeds the predicted position X1 + range position α (YES in # 5 of FIG. 4B), the biting signal is detected by the first stand S1 (FIG. 4).
(B) YES in # 6), it is determined to be normal, and rolling is continued (FIG. 4 (b) # 7). Note that FIG. 6A is the same as FIG.
The relationship between time and the biting signal detected by the load measuring device 5 provided with the first stand S1 of the mandrel mill S shown in each of (d) to (d) is shown.

As described above, in the rolling abnormality detecting device 11 of the second embodiment, the mandrel bar B at the moment when the hollow shell P is bitten by the first stand S1 of the mandrel mill S.
It is possible to detect early biting or bite delay that causes rolling defects at the initial stage of rolling by detecting the position of the roll and determining the position, and therefore rolling defects can be spread over the entire rolling process. Can be prevented in advance.

(Third Embodiment) A rolling abnormality detecting device according to claim 3 of the present invention will be described with reference to FIG. Two
1 is for inserting the mandrel bar B into the hollow shell P,
A rolling abnormality detecting device according to the present invention, which detects a positional defect between the mandrel bar B and the hollow shell P and a dimension defect of the hollow shell P, and detects an early biting and a biting delay in an early stage of rolling. , Is configured as follows.

The rolling anomaly detection device 21 has the configuration of the first embodiment and the configuration of the second embodiment, and the comparison device 23 and the control device 24 have the above-mentioned points of functioning as follows. Different from the first and second embodiments.

The comparing device 23 compares the load torque signal output from the driving device 2D with a preset threshold value, and at the same time, the mandrel bar when the hollow shell P is bit into the first stand S1. The position of B is compared with the inside or outside of the preset range.

Further, the control device 24 stops the drive device 2D when the comparison device 23 determines that the load torque signal exceeds the threshold value, and sets the predicted position X1 ± range position α. When it is given to the comparison device 23 and the detected position Y is out of the range, the rolling is stopped and controlled.

By doing this, the mandrel bar B
At the stage of inserting the hollow shell P into the hollow shell P, the position error between the mandrel bar B and the hollow shell P and the dimensional failure of the hollow shell P are detected, so that troubles during rolling can be prevented. In addition, since the early biting and the bite delay are detected in the early stage of rolling, it is possible to prevent rolling defects from reaching the entire hollow shell, and as a result, the rolling is performed properly. Increase productivity

The present invention is not limited to the above embodiment, but various modifications can be made. First and third described above
Although the position detector 2E detects the tip position of the mandrel bar B from the movement amount of the rack 2A in the embodiment, for example, only the movement amount of the rack 2A may be simply detected as a comparison element.

Further, in the above-mentioned second and third embodiments,
Although the load measuring device 5 is used to detect that the hollow shell P is bitten into the first stand S1 of the mandrel mill S, for example, the load of the drive device that drives the roll of the first stand S1. You may make it detect an electric current.

[0064]

As described above, the rolling abnormality detecting device of the present invention is the load torque detecting means for detecting the load torque when the mandrel bar is driven, or the mandrel bar for inserting the mandrel bar into the hollow shell. Since a load detection means for detecting the insertion load applied to the mandrel is compared with the load torque signal or the load signal and the threshold value is exceeded, the mandrel bar drive device is stopped and controlled when the threshold value is exceeded. When the hollow shell is inserted into the mill, it is possible to detect the position error between the mandrel bar and the hollow shell and the dimension error of the hollow shell, thus preventing the troubles leading to equipment damage. .

Further, the rolling abnormality detecting device of the present invention is provided with the position detecting means for detecting the mandrel bar position and the biting detecting means for detecting that the hollow shell has been bitten by the first stand, and has a normal state. When the hollow shell is bitten into the first stand, the position of the corresponding mandrel bar is calculated and predicted, and when the mandrel bar is located outside a certain range including the predicted position, the biting early Or it is judged as biting delay and the rolling is stopped, so
In the initial stage of rolling, it becomes possible to prevent the abnormal rolling of the entire hollow shell from being continued.

Further, the rolling abnormality detecting device of the present invention compares the load torque signal or the load signal detected by the load torque detecting means or the load detecting means with the threshold value when inserting the mandrel bar into the hollow shell. When the threshold value is exceeded, the drive device is stopped, and at the initial stage of rolling, the mandrel when the hollow shell is caught in the first stand of the mandrel mill by the position detection means and the engagement detection means. The bar position is detected, and rolling is stopped when the detected mandrel bar position is outside the range including the predicted position.Therefore, from the stage of inserting the mandrel bar into the hollow shell to the beginning of rolling, there is a rolling problem. It is possible to detect the factors that cause the rolling, so that the rolling is performed properly and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a rolling anomaly detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a load torque signal and time in the first embodiment of the rolling anomaly detection device of the present invention, showing a situation where an abnormality is determined when a threshold value is exceeded.

FIG. 3 is a diagram showing a configuration of a rolling anomaly detection device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a procedure for determining an early biting and a biting delay in the second embodiment of the rolling abnormality detecting device of the present invention.

FIG. 5 is a diagram showing a predicted position, an early biting range position, and a biting delay range position in a second embodiment of the rolling abnormality detection device of the present invention.

FIG. 6 is a diagram showing a relationship between mandrel bar position and time in the second embodiment of the rolling abnormality detecting device of the present invention, (b) is a normal state, (c) is an early biting state, (D)
FIG. 6B is a diagram showing a timing at which the hollow shell is bitten into the first stand when biting is delayed.

FIG. 7 is a diagram showing a deviation between a predicted position X1 and a first stand biting position Y in actual operation in the second embodiment of the rolling abnormality detecting device of the present invention.

FIG. 8 is a diagram showing a configuration of a rolling anomaly detection device according to a third embodiment of the present invention.

FIG. 9 is a diagram for explaining a Mannesmann-mandrel mill rolling facility.

[Explanation of symbols]

1 Rolling anomaly detector 2 Mandrel bar drive 2C rotating machine 2D drive device (load torque detection means) 2E Position detector (position detection means) 3 Comparison device (comparison means) 4 Control device (control means) 5 Load measuring device (bite detection means) 11 Rolling anomaly detector 13 Comparison device (comparison means) 14 Control device (control means) 21 Rolling anomaly detector 23 Comparison device (comparison means) 24 Control device (control means) B Mandrel bar P Hollow shell S Mandrel Mill S1 first stand

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-59-120309 (JP, A) JP-A-3-169408 (JP, A) JP-A-59-61513 (JP, A) JP-A-8- 117816 (JP, A) Actual Kaihei 3-9203 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 25/02 B21B 17/02-17/06 B21C 51/00

Claims (3)

(57) [Claims] 1. A rolling abnormality detecting device for detecting a factor causing rolling abnormality when a mandrel bar is inserted into a hollow shell in a Mannesmann-mandrel mill rolling, the rolling abnormality detecting device being provided in a driving device for driving the mandrel bar, A load torque detecting means for detecting a load torque when driving the mandrel bar, or a load provided for a holding device for holding the mandrel bar, and detecting a load applied to the mandrel bar when the mandrel bar is inserted into the hollow shell. Detecting means, comparing means for comparing the signal level detected by the load torque detecting means or the load detecting means with a preset threshold value, and it is determined by this comparing means that the threshold value has been exceeded. A rolling anomaly detection device, comprising: a control means for stopping and controlling the drive device. 2. A rolling abnormality detecting device for detecting a factor that causes rolling abnormality at an initial stage of rolling a hollow shell having a mandrel bar inserted in a Mannesmann-mandrel mill rolling, the mandrel being inserted into the hollow shell. The position detecting means for detecting the bar position, the bite detecting means for detecting that the hollow shell is bitten into the first stand, and the hollow shell is bitten into the first stand by this bite detecting means. The mandrel bar position at the time of detecting that the comparison means for comparing whether the inside or outside of the preset range,
In a normal state, the mandrel bar position corresponding to when the hollow shell is bitten into the first stand is calculated and predicted, and the mandrel bar at a certain time earlier and later is included so as to include the predicted position. A position is set as the range and is given to the comparison means, and a control means for stopping and controlling the rolling when the mandrel bar position is determined to be outside the range by the comparison means is provided. Rolling abnormality detection device. 3. A rolling abnormality detecting device for detecting a factor that causes rolling abnormalities when a mandrel bar is inserted into a hollow shell in a Mannesmann-mandrel mill rolling and at an initial stage of rolling, wherein the apparatus according to claim 1 is provided. Item 2. A rolling anomaly detection device having the configuration of Item 2.