Abnormality detection device for sizing press device and abnormality detection method for sizing press device

Abstract

To provide a technique capable of suppressing work under width reduction in a state where the number of screws for supporting a press tool is reduced.SOLUTION: A device for detecting an abnormality of a sizing press device including a press tool disposed to face the lateral side of a rolled slab in a width direction, a plurality of screw shafts for adjusting the position of the press tool, and a crank mechanism for causing the press tool to reciprocate and designed to reduce the widths of the screw shafts comprises: position detection means in the screw shafts; a control means for acquiring information from the position detection means to be able to monitor the positions of the screw shafts. A method for detecting the abnormality of the sizing press device uses the device and determines whether the positions of the screw shafts are within a prescribed range by the control means.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an abnormality detection device and an abnormality detection method for detecting abnormalities and deterioration states of a width adjustment mechanism in a hot rolling sizing press device. [Background technology]

[0002] When width reduction is performed using a start-stop sizing press, the maximum press load is 2500tf-3000tf (24.5MN-29.4MN). The press load is designed on the assumption that it will be distributed fairly evenly among multiple screws.

[0003] In a sizing press, a crank mechanism reciprocates the press tool to reduce the width of the rolled material. When the width reduction is released, that is, when the rolled material and the press tool are not in contact, the sizing press moves the rolled material forward and backward to the position where it will come into contact with the next press tool, thereby adjusting the width.

[0004] During this width adjustment, if a failure to transmit input torque occurs in one screw due to, for example, worn coupling teeth or a loose universal joint, this failure to transmit input torque is called drive edge disconnection. In this case, the number of screws supporting the press tool during width reduction will decrease. This can cause loads on the pressure-receiving mechanism, including the press tool and screws, that exceed their design strength, potentially damaging the equipment.

[0005] As a prior art for detecting abnormalities in a sizing press, Patent Document 1 discloses an abnormality detection device for a sizing press. The device is composed of devices that measure the loads on the support wheels, screws, and universal joints that support a block equipped with press tools, i.e., a device that measures the load on the sizing press body.

[0006] Furthermore, Patent Document 2 discloses a monitoring device for a sizing press machine. This device is equipped with a monitoring device that detects the operating speeds of various parts, a computing device that calculates the relative positions of operating bodies, a determining device that determines whether the operating state is normal or abnormal, and a control device that controls the machine to automatically recover from the abnormal state when an abnormality is detected. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 02-006031 [Patent Document 2] Japanese Patent Application Publication No. 03-077704 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the above-mentioned conventional techniques have the following problems. The device described in Patent Document 1 is premised on measuring the load during width reduction and determining whether an abnormality has occurred, and it is difficult to prevent the occurrence of an abnormal load in advance.

[0009] In the device described in Patent Document 2, a computing device calculates the interrelationship between each movable body based on signals from a rotation detection device such as a pulse generator (PLG) that detects the opening and closing speed of the screw.The device is configured so that a determining device determines the width reduction operating state of the sizing press from the calculation results of the computing device.

[0010] However, it is not assumed that the open / closed state of all screws will be monitored.If a rotation detection device is attached to the drive distribution reducer for each screw, there is a problem in that it is difficult to accurately detect an abnormality when drive loss occurs in the coupling or universal joint downstream of the reducer output shaft.

[0011] The present invention has been made in consideration of the above circumstances, and aims to provide a technique for preventing width reduction work in a state where the number of screws supporting the press tool is reduced. [Means for solving the problem]

[0012] In order to solve the above problem, the inventor discovered that by providing a rotation detector or displacement detector on the secondary side of the distribution reducer, i.e., on all screw shafts, it is possible to monitor the position information of all screw shafts, and completed the invention.

[0013] The abnormality detection device for a sizing press of the present invention, which advantageously solves the above-mentioned problems, is an abnormality detection device for a sizing press that comprises a press tool arranged opposite the widthwise sides of the slab to be rolled, a plurality of screw shafts that adjust the position of the press tool, and a crank mechanism that reciprocates the press tool, and that reduces the width of the slab to be rolled, and is characterized in that it has position detection means for all of the screw shafts and control means that can acquire information from the position detection means and monitor the position of the screw shafts.

[0014] The abnormality detection device for a sizing press according to the present invention is (a) the position detection means is either one or both of a rotation detector for the screw shaft and a displacement detector for detecting the amount of movement of the slab in the width direction relative to the screw shaft; (b) the control means has a calculation device that acquires information from either one or both of the rotation detector and the displacement detector and calculates the current position of the screw shaft from the information, and a determination device that automatically determines the obtained calculation result; This may be a more preferable solution.

[0015] The method for detecting an abnormality in a sizing press according to the present invention, which advantageously solves the above-mentioned problem, uses any of the above-mentioned abnormality detection devices for a sizing press, and is characterized in that the control means determines whether the position of the screw shaft is within a predetermined range.

[0016] In addition, in the method for detecting an abnormality in a sizing press according to the present invention, a more preferable solution may be that the control means issues an alarm and stops operation of the sizing press when it determines that the position of the screw shaft is not within a predetermined range. [Effects of the Invention]

[0017] The sizing press anomaly detection device and sizing press anomaly detection method of the present invention can prevent width reduction when the number of screws supporting the press tool is reduced. This can prevent equipment failures due to abnormal loads. Specifically, the position information of all screws is measured and calculations and judgments are performed based on the measurement results. This ensures that all screws are reliably moved to their correct positions even before width reduction is performed, i.e., during the width adjustment operation. This is expected to result in improved equipment availability and is therefore industrially useful.

[0018] Furthermore, by monitoring the changes in the values ​​detected by the rotation detector and displacement detector, it is possible to grasp the backlash of each screw shaft, which makes it possible to detect the progression of deterioration of the screw nuts, etc. This allows preventive maintenance to be carried out before a serious failure occurs. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram showing the configuration of an abnormality detection device for a sizing press according to one embodiment of the present invention. FIG. [Figure 2] FIG. 10 is an enlarged schematic view showing a connection portion between the screw shaft and the press tool at part X according to the embodiment. [Figure 3] 4 is a graph showing an example of the position of the screw shaft measured by the position detection means of the embodiment over time. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following describes in detail the embodiments of the present invention. The following embodiments are merely examples of devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope defined in the claims.

[0021] Fig. 1 is a schematic diagram showing the configuration of an abnormality detection device for a sizing press according to one embodiment of the present invention, and Fig. 2 is a schematic diagram showing an enlarged view of a connection portion between a screw shaft and a press tool.

[0022] The sizing press 100 has an inner block 5 for width adjustment. This inner block 5 reciprocates in a direction perpendicular to the conveying direction FD of the slab material 2, i.e., in the width direction of the slab material 2 as the slab to be rolled. A pair of tapered dies 1 fixed to the inner block 5 presses both sides of the slab material 2 to reduce its width. Each inner block 5 is rotatably connected to multiple width adjustment screws 13. These screws 13 are threadedly engaged with screw nuts 3 fixed to the outer block 6. At the same time, they are driven and rotated by a drive motor 12 of the width adjustment mechanism via a universal joint 7, a spline shaft 8, and a distribution gear. The distribution gear consists of an offset gearbox 9, a gear coupling 10, and a distribution reducer 11.

[0023] Therefore, the screw 13 incorporated in the outer block 6 is driven to rotate by the drive motor 12, and the position of the inner block 5 is adjusted, thereby adjusting the width difference of the slab material 2. The outer block 6 performs reciprocating motion via a crank mechanism (not shown), which causes the width of the slab material 2 to be reduced by the die 1 (width reduction). The press tool consists of the die 1, inner block 5, and outer block 6.

[0024] Meanwhile, the slab material 2 is sandwiched between pinch rolls provided at the front and rear, and is transported to the next press position (material transport) while it is released from the mold 1. In this way, width reduction and material transport are alternately repeated to reduce the entire length of all sides of the slab material 2.

[0025] When the width adjustment screw 13 receives a width reduction force, it rotates in the reverse direction. Therefore, the drive motor 12 is equipped with an air brake, which opens before the screw rotates, and closes and locks the screw when the rotation is complete.

[0026] The sizing press of this embodiment uses various detection devices. For example, a load cell 4 for detecting the width reduction load is attached to the end of the screw 13 or the bottom of the screw nut 3.

[0027] In this embodiment, position detection means 14 are provided to detect the positions of all screws 13. The rotation detector serving as the position detection means 14 is installed on the spline shaft 8 or the screw 13 to detect the amount of rotation, for example, by the direction of rotation, the number of rotations, and the rotation angle. The displacement detector serving as the position detection means 14 is installed on the spline shaft 8 or the screw 13 to directly detect the amount of movement in the width direction of the slab material (the direction perpendicular to the conveying direction FD). Either a rotation detector or a displacement detector is installed for all screws 13; it is preferable to install both. The position detection means 14 is preferably installed on the screw 13, where it can detect abnormalities even when the universal joint 7 breaks.

[0028] In this embodiment, the control means 17 collects information detected by the position detection means 14. The control means 17 is composed of a computer, a sequencer, or the like. The control means 17 has a calculation device that sequentially calculates the information transmitted by the position detection means 14 and determines the current positions of all screws 13. The control means 17 also has a determination device that determines whether all screws 13 are within predetermined ranges set for each stage of width reduction and material transport. If the position deviation of the screws 13 exceeds the predetermined range and is determined to be abnormal, the control device issues an alarm and stops the sizing press 100. For example, if the abnormality is determined to exceed a predetermined value due to drive edge disconnection or coupling tooth skipping, the equipment can be stopped before transitioning to width reduction operation.

[0029] The control means 17 may constantly monitor the position of the screw 13 and also collect information from detection devices, such as the rolling load of the load cell 4, the number of rotations of the drive motor 12, and the number of rotations and rotation speed of the pinch rolls. Then, it comprehensively evaluates this information to monitor the operation of the sizing press apparatus 100, and if an abnormality is detected, it is preferable to avoid the abnormality, notify the abnormality, or stop the equipment.

[0030] FIG. 2 is an enlarged schematic diagram of the area X in FIG. 1, showing the cross-sectional relationship between the pressure block 15 fixed to the inner block 5, the screw fastening ring 16, and the tip of the screw 13. In this embodiment, as shown in FIG. 2, the threshold value for determining abnormal position deviation of each screw 13 is preferably set to be equal to or less than the gap between the screw 13 and the screw fastening ring 16. This prevents damage to the screw fastening ring 16. The threshold value is preferably set to be equal to or less than 2.0 mm. Furthermore, it is more preferable that this threshold value be set to be equal to or less than 1.5 mm. [Example]

[0031] In the sizing press 100 shown in Figure 1, a CYLINC cylinder or laser displacement sensor was used as the position detection means 14, and the positional fluctuation of the screw 13 was calculated by a calculation device in the control means 17. The results are shown in a graph in Figure 3. In Figure 3, the vertical axis represents the positional fluctuation x of the screw 13 during width adjustment operation, and the horizontal axis represents the elapsed time t. During normal operation, the positional fluctuations x of all screws appear superimposed on the solid line A. On the other hand, when a drive edge break occurs in one of the screws, the positional fluctuation x of that screw is represented by the dashed line B. Therefore, a positional deviation of the screw occurs between the solid line A and the dashed line B. For example, a threshold value indicated by D can be set, and when the positional deviation between one screw and another exceeds that value, an equipment abnormality can be detected. This determination can be made by a determination device in the control means 17.

[0032] Furthermore, if the screw nut 3 or the tip of the screw 13 is worn due to poor lubrication or overload rolling, the graph will deviate from the normal screw (solid line A), as shown by the dashed-dotted line C in Figure 3. Normal wear levels can be determined in advance from the equipment's usage history, and when the wear level measured as the deviation between the solid line and the dashed-dotted line exceeds a predetermined value, it can be determined to be abnormal wear. Depending on the degree of wear, this can be reflected in the equipment's maintenance cycle. [Industrial Applicability]

[0033] The sizing press anomaly detection device and sizing press anomaly detection method of the present invention can prevent equipment failures due to abnormal loads caused by width reduction. Furthermore, it is possible to detect the progression of deterioration of the screw nuts, enabling preventive maintenance before a serious failure occurs. As a result, it is expected that the equipment operating rate will be improved, making it industrially useful. [Explanation of symbols]

[0034] 100 Sizing press device 1. Mold 2. Slab material (rolled slab) 3 screw nuts 4 load cells 5 Inner Block 6. Outer Block 7 Universal Joint 8 spline shaft 9 Offset Gearbox 10 Gear Coupling 11 Distribution reducer 12 Drive motor (for width adjustment mechanism) 13 Screw 14 Position detection means (rotation detector, displacement detector) 15 Pressure Block 16 Screw fastening ring 17 Control Means FD Conveying direction

Claims

1. An abnormality detection device for a sizing press apparatus for reducing the width of a rolled slab, the abnormality detection device comprising: press tools arranged opposite to each other on the sides of the width direction of the rolled slab; a plurality of screw shafts provided on each press tool for adjusting the position of the press tools; and a crank mechanism for reciprocating the press tools, position detection means for all of the screw shafts; and control means capable of acquiring information from the position detection means and monitoring the position of the screw shaft.

2. 2. The abnormality detection device for a sizing press apparatus according to claim 1, wherein the position detection means is either one or both of a rotation detector for the screw shaft and a displacement detector for detecting the amount of movement of the rolled slab in the width direction relative to the screw shaft.

3. 3. The abnormality detection device for a sizing press according to claim 2, wherein the control means includes: a calculation device that acquires information from either one or both of the rotation detector and the displacement detector and calculates the current position of the screw shaft from the information; and a determination device that automatically determines the obtained calculation result.

4. Using the abnormality detection device for a sizing press machine according to any one of claims 1 to 3, The control means determines whether the position of the screw shaft is within a predetermined range.

5. 5. The method for detecting an abnormality in a sizing press according to claim 4, wherein the control means issues an alarm and stops operation of the sizing press when it determines that the position of the screw shaft is not within a predetermined range.

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