JP5644073B2 - Thick plate shearing equipment and steel plate meandering prevention method - Google Patents

Description

  The present invention relates to a steel plate meandering prevention technique in a thick plate shearing facility.

  Conventionally, as a technique for preventing meandering of a steel sheet in a thick plate shearing facility, there is a technique disclosed in Patent Document 1. The meandering prevention technique of this document uses a presser roller and an intermediate presser roller to prevent meandering of the steel sheet. This technique will be described with reference to the side view of FIG. 5 and the plan view of FIG. It is as follows.

  In other words, the thick plate shearing equipment to which the steel plate meandering prevention technology is applied includes an entrance-side transport table 23 composed of a plurality of table rolls 22 and both ears of the steel plate 21 along the traveling direction of the steel plate 21. DSS inlet side pinch roll 24 and DSS outlet side pinch roll 26 in which double side ear shears (hereinafter referred to as DSS) 25 and a pair of upper and lower roll pinch rolls are arranged in a pair on the left and right sides. And a shearing machine (Slitter) (hereinafter referred to as SL) 28 that shears the steel sheet 21 in the longitudinal direction and divides the steel sheet 21 into a plurality of sheets along the width direction, and a pair of pinch rolls composed of upper and lower rolls. It consists of an SL entry side pinch roll 27 and an SL exit side pinch roll 29 and an exit side conveyance table 31 comprising a plurality of table rolls 22.

  Further, in addition to these facilities, the presser roller 32 is disposed on the entrance-side transport table 23, the presser roller 34 is disposed on the exit-side transport table 31, and the intermediate presser roller 36 is disposed in the DSS 25.

  As shown in the front view of FIG. 7, the presser rollers 32 and 34 described above are coated on the outer peripheral surface with a high friction elastic material. The presser rollers 32 and 34 sandwich the steel plate 21 between the table rolls 22 and are supported by the fluid pressure cylinders 38 at the positions of the bearing portions 32a and 34a on both sides thereof. ing.

  Further, as shown in the front view of FIG. 8, the intermediate presser roller 36 also has an outer peripheral surface covered with a high friction elastic material. The intermediate presser roller 36 comes in contact with the steel plate 21 whose both side ears are sheared in the DSS 25 from the upper surface, and is attached to a support member 39 that rotatably supports the intermediate presser roller 36. The fluid pressure cylinder 38 can be moved up and down.

  In the above-described thick plate shearing equipment, when the steel plate is sheared, a pair of upper and lower pairs of the DSS inlet side pinch roll 24, the DSS outlet side pinch roll 26, the SL inlet side pinch roll 27, and the SL outlet side pinch roll 29 are respectively paired. The steel plate is sandwiched by the pinch rolls and sheared while the steel plate 21 is running.

  At this time, a force to meander the steel plate 21 is applied to the steel plate 21, but the force to meander is to be prevented by the pressing force of the presser rollers 32 and 34 and the intermediate presser roller 36 described above. It is disclosed that if the steel plate 21 is cut without preventing meandering, both side surfaces 21a of the steel plate 21 have a saw-tooth shape as shown in the plan view of FIG. ing.

  Moreover, there is a technique disclosed in Patent Document 2 as a meandering prevention technique in a meandering adjustment feeder apparatus that intermittently feeds a web-like sheet. The present technology is a meandering adjustment feeder device that intermittently feeds a web-like sheet, and moves the position in the width direction of the nip roll and the feed roll with the web-like sheet interposed therebetween, thereby A meandering adjustment feeder apparatus having a function of adjusting a position. It is described that the position of the feed roll in the width direction is controlled based on a signal (not shown) from a sensor that detects the position of the web-like sheet in the width direction.

Japanese Utility Model Laid-Open No. 5-18702 JP 2006-282373 A

As a cause of meandering that occurs in the above-described shearing steel plate,
(1) Meandering force generated by the angle (θ) formed between the steel sheet conveying direction and the roll axis in a horizontal plane including the axis of the left and right pinch rolls (hereinafter referred to as a straightness difference);
(2) Left-right speed difference during conveyance of a steel sheet due to uneven wear difference between left and right pinch rolls (hereinafter referred to as uneven wear difference),
(3) Left-right speed difference (hereinafter referred to as peripheral speed difference) during conveyance of the steel sheet due to the speed difference between the left and right pinch rolls,
(4) A left-right pinch force difference (hereinafter referred to as a pinch force difference) when a steel plate is clamped by an actuator that moves up and down the pinch rolls is considered.

Among the above causes of meandering, roll replacement based on periodic roll diameter measurement for (2),
For (3), a mechanical tie structure in which a connecting shaft is provided between the left and right pinch rolls or electric signal control of a pinch roll drive actuator for synchronizing the left and right roll peripheral speeds, and for (4) actuator settings (for example, hydraulic cylinders) In this case, it is generally managed by adjusting the set pressure).

  However, with regard to the difference in the straightness of the pinch roll of (1), it is necessary to perform high-precision measurement in the direction of conveying the steel sheet, which is a reference for the straightness. For example, over the entire length from the entrance side to the exit side of the thick plate shearing equipment, a piano wire corresponding to the steel plate conveyance direction is stretched and the positional relationship with the pinch roll is measured. There is a problem that regular management becomes difficult because of the large labor and long line down time.

On the other hand, although the steel plate meandering prevention method in the thick plate shearing facility disclosed in Patent Document 1 has a moderate meandering prevention effect, it counteracts the meandering force caused by the frictional force of the roller to prevent meandering. There is a problem that it is not a drastic measure to prevent meandering.
In addition, when the frictional force is reduced due to roller wear or the like, the effect of preventing meandering is reduced, so that there is a problem that the roller needs to be replaced. Furthermore, since the amount of meandering of the steel sheet cannot be detected, there is a problem that the replacement cycle of the roller cannot be accurately grasped and a large amount of quality defects may be induced.

  The meandering prevention method disclosed in Patent Document 2 is based on a signal (not shown) from a sensor that detects the position in the width direction of the web-like sheet. Regarding the amount detection means, in reality, the steel sheet is not a perfect rectangular parallelepiped, and there is a case where there is a bend in the conveying direction, and the end face of the steel sheet changes due to the shearing of the plate width end face by the thick plate shearing equipment. In the steel plate end face position measurement, which is a typical meandering amount detection means, there is also a problem that it is difficult to accurately evaluate the meandering amount.

  The present invention has been made in order to solve the above-described problems of the prior art. By examining the installation state of the pinch rolls, it is possible to implement countermeasures against essential causes of meandering. An object of the present invention is to provide a thick plate shearing equipment and a steel plate meandering prevention method capable of solving the problems related to the position measurement of the end face of the steel plate, which is a detecting means, and reducing the installation space and various costs.

The inventors have intensively studied the meandering phenomenon of the steel plate in the steel plate shear line,
(A) When the angle (θ) between the steel plate conveyance direction and the pinch roll axis in the horizontal plane including the pinch roll axis is orthogonal (θ = 90 °), the steel plate conveyance direction and the actual steel plate movement direction Note that there is no meandering of the steel plate because
(B) When there is a deviation in the straightness (when there is a difference in the straightness (θ ≠ 90 °)), the relative speed component due to the deviation between the steel plate conveyance direction and the pinch roll circumferential speed direction is the meandering speed component. And the occurrence of meandering of the steel plate according to the speed,
(C) If a speed component that cancels the meandering speed component is given in the axial direction of the pinch roll, even if there is a difference in the degree of straightness, the steel plate conveyance direction and the actual steel plate movement direction match.
And the present invention has been completed.
The gist of the present invention is as follows.

A first invention is provided with an ear cutting machine that simultaneously cuts both side ears of a steel sheet, and a pair of upper and lower rolls that are provided on the entry side and the exit side of the ear part cutting machine, respectively, near each ear part of the steel sheet. Pinch rolls sandwiched between, a split cutting machine that splits the steel sheet along the width direction, and a pair of upper and lower rolls provided on both the inlet and outlet sides of the split cutting machine and in the vicinity of both end portions of the steel sheet to be split It is a thick plate shearing equipment consisting of a pinch roll sandwiched between
While the steel plate is running through the ear cutting machine or the split cutting machine, meandering caused by the angle (θ) formed by the steel sheet conveying direction and the roll axis in the horizontal plane including the roll axis of the pinch rolls on the left and right sides of the steel sheet width direction A mechanism that can move the pinch roll in the axial direction without being constrained so that the generated force is canceled by the axial displacement of the pinch roll, and while the steel sheet is being sheared by the ear cutting machine or the divided cutting machine, In order to prevent lateral displacement, a thick plate shearing facility comprising a pinch roll having a mechanism for stopping movement of the pinch roll in the axial direction.

  According to a second aspect of the present invention, in the mechanism in which the pinch roll is movable in the axial direction without being constrained, the power transmission shaft between the upper and lower pinch rolls and the roll driving force generation source has a spline connection structure, and the pinch roll The mechanism that stops the movement in the axial direction is an actuator with a position holding function that stops the flange surface or spline shaft end surface provided on the side surface of the pinch roll or the outer periphery of the spline shaft on the pinch roll side via a thrust bearing. The thick plate shearing equipment according to the first invention.

  The third invention uses the thick plate shearing equipment according to the second invention to release the position holding function of the actuator attached to the pinch roll while the steel plate is running, and roll the pinch rolls on the left and right sides in the steel plate width direction. The pinch roll is not constrained so that the meandering force caused by the angle (θ) between the steel plate conveyance direction and the roll axis in the horizontal plane including the axis is offset by the axial displacement of the pinch roll. When the steel plate is sheared by the ear cutting machine or the split cutting machine, the position holding function of the actuator is operated to fix the axial displacement of the pinch roll and prevent the lateral deviation during the steel plate shearing. This is a method for preventing meandering of a steel sheet.

  The fourth invention is such that the displacement of the pinch roll in the roll axis direction returns to the initial position state before the shearing of the steel plate is completed by the ear cutting machine or the split cutting machine and before the shearing of the next steel sheet is started. The method for preventing meandering of a steel sheet according to a third aspect of the invention is characterized in that the stroke of the actuator is adjusted.

  According to the present invention, with regard to the meandering phenomenon caused by the angle (θ) between the steel sheet conveying direction and the roll axis in the horizontal plane including the axis of the left and right pinch rolls, the difference in roll perpendicularity with a large effort and line stop time ( Alignment) The meandering caused by the same factor can be prevented without performing the measurement work. Further, since the meandering of the steel sheet can be prevented without newly installing a presser roll or the like, the cost and installation space required for preventing the meandering of the steel sheet can be greatly reduced. In addition, since it is not necessary to detect the amount of meandering of the steel sheet, it is possible to solve the problems related to the conventional meandering detection method due to the change in the position of the end face of the sheet width due to the bending or shearing of the steel sheet.

It is a top view explaining the pinch roll equipment of the present invention. It is a figure explaining the principle of operation of the present invention. It is a figure explaining the driving cycle using the installation of the present invention. It is a figure explaining the effect of this invention. It is a side view which shows the conventional thick plate shear equipment. It is a top view which shows the conventional thick plate shearing equipment. It is a front view which shows the structure of the presser roll of the conventional thick plate shearing equipment. It is a front view which shows the structure of the intermediate presser roll of the conventional thick plate shear equipment. It is a top view which shows the end surface shape of the steel plate sheared while meandering.

  As shown in FIG. 6, the thick steel plate shearing equipment has a DSS 25 for cutting both edges in the longitudinal direction of the steel plate and an SL 28 for cutting the central portion in the width direction of the steel plate adjacent to the steel plate shear line. A pair of upper and lower pinch rolls 24, 26, 27, and 29 that are driven on both sides of the widthwise direction of the steel plate from above and below are installed on the exit side and the entrance and exit sides of the SL 28.

  A pair of upper and lower pinch rolls are both rotationally driven by a motor M via a speed reducer (not shown) and a power transmission shaft (roll shaft), as shown in the plan view of FIG. It is a mechanism. Further, the upper roll and the lower roll have a mechanism that is opened and closed by a fluid pressure cylinder (for example, 38 in FIG. 7) that is not shown, so that when the steel sheet is sandwiched between the upper and lower rolls, the steel sheet can be conveyed for a certain length. ing.

In the present invention, the power transmission shaft (roll shaft) from the motor M has a spline connection structure (FIG. 1A), and the upper and lower rolls of the pinch roll can move without being restricted in the roll axis direction. ing.
The spline connecting structure used in the present invention has a hollow boss side on the motor side and a spline shaft with involute tooth profile on the pinch roll side. A possible involute spline structure is preferable.

  In the present invention, there is further provided an actuator with a position holding function for fixing a flange surface or a spline shaft end surface provided on the side surface of the pinch roll or on the outer periphery of the spline shaft on the pinch roll side through a thrust bearing (FIG. 1B). ).

  An actuator with a position-holding function is a type of hydraulic cylinder that applies hydraulic pressure between the cylinder and the cylinder rod, allows the cylinder rod to move by expanding the inner peripheral wall of the cylinder, and tightens the cylinder when the hydraulic pressure is released. Returning to the original state, the cylinder rod can be fixedly held (FIGS. 1B and 1C). The actuator may be an actuator using another method as long as the operation can be fixed at an arbitrary timing.

  In the present invention, by adopting the mechanism described above, the upper and lower pinch rolls can be moved without being restricted in the roll axis direction, and the movement of the pinch rolls in the roll axis direction can be fixed at an arbitrary timing. It becomes possible.

  Next, the operation principle of the present invention will be described with reference to FIG.

  FIG. 2 (a) is a diagram showing a state in which the angle (θ) formed between the steel sheet conveying direction and the roll axis in a horizontal plane including the axis of the left and right pinch rolls is orthogonal (θ = 90 °). In the state, since the steel plate conveying direction and the actual steel plate moving direction coincide with each other, no meandering of the steel plate occurs.

  FIG. 2B is a diagram showing a state where there is a straightness deviation (straightness difference) (θ ≠ 90 °), and the relative speed component due to the deviation between the steel sheet conveyance direction and the roll circumferential speed direction becomes a meandering speed component. Then, meandering corresponding to the same speed occurs.

  FIG.2 (c) is a figure explaining the operation | movement using the installation of this invention. That is, when the upper and lower rolls of the pinch roll are made movable in the roll axis direction, the meandering speed component shown in FIG. 2b is not restrained in the roll axis direction by the pinch roll movement speed in the roll axis direction. Therefore, the steel plate conveyance direction and the actual steel plate movement direction coincide with each other, and the occurrence of meandering can be suppressed.

  When the present invention is applied and the above meandering velocity component is present between the steel plate and the pinch roll, the unconstrained pinch roll moves in the roll axis direction, but this phenomenon is a balance of inertial force. Can be explained by For example, the weight of a steel plate to be subjected to thick plate shear is generally 5 tons or more, whereas the pinch roll has a hollow structure with a roll diameter of 600 to 700 mm and a roll length of about 300 mm. In general, the weight is about 0.5 tons.

The balance of the force of the meandering speed component generated between the steel plate and the pinch roll (corresponding to the inertial force F in the present invention)
Inertial force F = m _{steel plate} x a _{steel plate} = M _{pinch roll} x a _{pinch roll}
Therefore, the acceleration for moving the steel sheet is about 1/10 of the acceleration of the pinch roll. Furthermore, since the steel plates are supported not only by the pinch rolls but also by the table rolls installed before and after the thick plate shearing equipment, the steel plates are more difficult to move relative to the pinch rolls. is there. Therefore, when the present invention is applied, the steel sheet does not move in the meandering direction, and only the unconstrained pinch roll moves in the roll axis direction.

  Next, the operation of this facility will be described with reference to FIG.

  FIG. 1A is a diagram illustrating an initial state in which the axial movement of the pinch roll is zero.

  FIG. 1 (b) is a diagram showing a state in which the steel plate is running, and the actuator with a position holding function is in an unlocked state, that is, a stroke is free, and can move in the roll axis direction without the pinch roll being restrained. It is in a state. Although the orthogonality difference of the angle (θ) between the steel plate conveyance direction and the pinch roll axis is not shown, the pinch roll moves in the roll axis direction at a speed that cancels the steel plate meandering speed according to the orthogonality difference. .

  FIG. 1C is a diagram showing a state during shearing of the steel sheet, and the above-mentioned actuator with the position holding function is locked by an interference effect to fix the displacement in the roll axis direction, thereby preventing the lateral displacement at the time of shearing the steel sheet. .

The operation cycle of the thick plate shearing equipment for one steel plate will be described with reference to FIG.
While the steel plate is traveling, the position holding function of the actuator is released, and the pinch roll is in a state of being movable in the roll axis direction without being restrained. Before the start of shearing, the position of the pinch roll in the width direction of the steel sheet is in the initial state (zero displacement). Next, in response to a signal to start shearing the steel plate (not shown), the position holding function of the actuator is fixed, so that the movement of the pinch roll in the roll axis direction is fixed. When one shearing cut is completed, the pinch roll is driven in response to an end signal (not shown), and the steel sheet is conveyed for a certain length. During this time (while the steel plate is running), the position holding function of the actuator is released, and the pinch roll is movable in the roll axis direction without being restrained. The above operation is repeated for each shearing cut, and when the shearing operation of the steel sheet is completed, the actuator is operated until the shearing of the next steel sheet is started, and the pinch roll is displaced in the axial direction of the roll axis. Return to the initial position that becomes zero.

  In FIG. 4, the effect at the time of applying this invention to the pinch roll of a thick plate shear line is shown. When the mean of product defect occurrence frequency due to meandering before application of the present invention is 1.0, application of the present invention can drastically reduce the product defect occurrence frequency to 1/10 before application, and the quality of the shear surface of the steel sheet product is reduced. Greatly improved.

21 Steel plate 21a Steel plate width end 22 Table roll 23 Entrance side conveyance table 24 DSS entrance side pinch roll 25 Double-sided ear cutting machine (DSS)
26 DSS Outlet Pinch Roll 27 SL Inlet Pinch Roll 28 Split Shearing Machine (SL)
29 SL Outlet Pinch Roll 31 Outlet Transport Table 32 Inlet Side Presser Roller 34 Outlet Side Presser Roller 36 Intermediate Presser Roller 38 Fluid Pressure Cylinder 39 Support Member

Claims (4)

An ear cutting machine that simultaneously cuts both ears of the steel sheet, a pinch roll that is provided on the entry side and the exit side of the ear cutting machine, and sandwiches each of the vicinity of both ears of the steel sheet with a pair of upper and lower rolls; a dividing cutting machine to the width divider steel plates, provided on the inlet side and the outlet side of the dividing cutting machine, thick plate made of a pinch roll sandwiching each of both side ends near the steel sheet divided by a pair of upper and lower rolls Shearing equipment,
Meander ears cutter or divided cutting machine during running steel plate, due to the angle (theta) formed by the steel plate conveyance direction and the roll axis in the horizontal plane containing the roll axis of the steel plate width direction left and right pinch rolls A mechanism that can move the pinch roll in the axial direction without being constrained so that the generated force is canceled by the axial displacement of the pinch roll, and while the steel sheet is being sheared by the ear cutting machine or the divided cutting machine, A thick plate shearing facility comprising a pinch roll having a mechanism for stopping movement of the pinch roll in the axial direction in order to prevent lateral displacement of the pinch roll.   In the mechanism in which the pinch roll is movable in the axial direction without being constrained, the power transmission shaft between the upper and lower pinch rolls and the roll driving force generating source has a spline connection structure, and the movement in the axial direction of the pinch roll 2. The mechanism for stopping the movement is an actuator with a position holding function for fixing a flange surface or a spline shaft end surface provided on the side surface of the pinch roll or the outer periphery of the spline shaft on the pinch roll side through a thrust bearing. Plate shearing equipment.   The steel plate in the horizontal plane including the roll axis of the pinch roll on the left and right in the width direction of the steel sheet is released while the steel plate is running using the thick plate shearing equipment according to claim 2. The pinch roll moves in the axial direction without being constrained so that the meandering force caused by the angle (θ) between the transport direction and the roll axis is offset by the axial displacement of the pinch roll, and the ear is cut. During the shearing of the steel sheet by the machine or the split cutting machine, the position holding function of the actuator is operated to fix the axial displacement of the pinch roll to prevent the lateral displacement during the shearing of the steel sheet. Prevention method.   Adjust the stroke of the actuator so that the displacement of the pinch roll in the roll axis direction returns to the initial position before the shearing of the steel plate is completed and the shearing of the next steel plate is started. The method for preventing meandering of a steel sheet according to claim 3.

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