JPH04351210A - Method for cutting end part to join bar stock and continuous hot sheet rolling equipment - Google Patents

Abstract

PURPOSE:To offer a method for cutting end part to join bar stocks so as to reduce curve in the vicinity of the joined part when joining them and to eliminate trouble in sheet passing in a a continuous hot sheet rolling equipment. CONSTITUTION:A detector 7 is arranged on the outlet side of a roughing mill 1 and curvedness at the rear end of a preceding bar stock 9 and that at the tip of the following bar stock 10 are measured. A cutting angle that reduces the curve in the vicinity of the joined part when joining the bar stocks, is calculated based on those curves with a computer 11, the bar stock holding angle of positioning guides 3, 4 or angle of the blade of a crop shear 5A is adjusted so as to obtain that cutting angle, and the rear end of the preceding bar stock and tip of the following bar stock are cut off. When end faces are joined together by a joining machine 6 after that, joining with small curve is made possible.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for cutting the joint end of a bar material and continuous hot thin plate rolling equipment, and in particular, the present invention relates to a method for cutting the joint end of a bar material and continuous hot thin plate rolling equipment, and in particular, the present invention relates to a method for cutting the joint end portion of a bar material and a continuous hot thin plate rolling equipment. The present invention relates to a method for cutting a joined end of bar material in a continuous hot thin plate rolling facility in which hot thin plates are manufactured by joining and continuously rolling in a finishing mill, and to the continuous hot thin plate rolling facility.

0002

BACKGROUND OF THE INVENTION After being rolled in a rough rolling mill, there are quality defects at the leading and trailing ends of the bar material, which impede the ability of the bar to pass through the finishing mill or cause narrowing. For this reason, as shown in FIG. 13, in conventional hot rolling equipment, a crop shear 42 is installed between the rough rolling mill 1 and the finishing rolling mill group 2 to cut the front and rear ends of the bar materials 40 and 41. There is. In this crop cutting, in order to improve the yield, the front and rear ends of the crop shown in FIG. 14 are detected in the television image of the television camera 43 shown in FIG. 13, pattern recognition is performed, and the appropriate cutting length L is automatically determined again. However, there are also systems that perform crop cuts. However, the purpose of this crop cutting is to cut crops with a high yield on the premise of batch rolling.

[0003] Further, as ancillary equipment for crop shears used in conventional hot rolling equipment, for example, "Steel Handbook I
As described in "II (1) Rolled Base Steel Plate", pages 179 to 180, there is a positioning guide device (centering device), which is installed in the front of the crop shear and guides the bar material so that it is perpendicular to the cutter.

On the other hand, recently, for example, Japanese Patent Laid-Open No. 58-112
As described in Publication No. 601, a continuous hot thin plate rolling facility has been proposed in which the trailing end of the leading bar material and the leading end of the trailing bar material after rolling in a roughing mill are joined together and then continuously rolled in a group of finishing mills. ing.

[0005]

[Problem to be Solved by the Invention] In continuous hot thin plate rolling equipment, the trailing end of the leading bar material and the leading end of the trailing bar material are joined together and rolled continuously, so there is no chance of biting or biting away from the finishing rolling mill group. This improves sheet threadability. However, there is a bend in the plate due to rough rolling at the front and rear ends of the bar material, which are the joints. This bending cannot be removed by simply cutting the front and rear ends of the bar material using a crop shear equipped with the conventional positioning guide as shown in FIG. 11. For this reason, the front and rear ends of the bar material are joined while being curved. If the bar material is joined with the front and rear ends bent in this way, the center line of the bar material will suddenly change (offset) with respect to the path center line near the joint portion. For this reason, the subsequent finish rolling causes a difference in plate thickness between the operating side and the driving side, that is, a difference in elongation, which causes threading problems such as drawing.

[0006] In order to avoid the above-mentioned troubles, when crop-cutting the leading and trailing ends of the bar material and when joining the bar material, the bar material is adjusted so that the amount of offset of the bar material center line with respect to the pass center line near the joint during joining is small. It is necessary to position. However, the bend at the tip and rear end of the bar material can be more than 10 meters long,
If this is attempted, a large-scale guide device will be required to position and hold the bent portion during crop cutting of the leading and trailing ends before joining and during joining.

An object of the present invention is to provide a method for cutting a joint end of a bar material and continuous hot thin plate rolling equipment that can reduce the amount of bending in the vicinity of the joint during joining of the bar material and eliminate troubles in threading the bar material. That's true.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for cutting the trailing end of the leading bar material and the leading end of the trailing bar material after rolling in a rough rolling mill with a crop shear, joining them together, and then finishing the material. In the cutting method of the joint end of bar material in continuous hot thin plate rolling equipment that manufactures hot thin plate by continuous rolling in a rolling mill, the amount of bending of the trailing end of the leading bar material at the exit side of the rough rolling mill and the amount of bending of the trailing end of the bar material Measure the amount of bending at the tip of the bar material, and based on this amount of bending,
This method calculates a cutting angle that reduces the amount of bending in the vicinity of the joint when joining bar materials, and cuts the rear end of the leading bar material and the tip of the trailing bar material so that this cutting angle is obtained. In this case, the cutting angle can be obtained by holding the rear end of the leading bar material and the leading end of the trailing bar material with positioning guides placed at the front and rear of the crop shear, and adjusting the angle of the bar center line with respect to the pass center line. Alternatively, it may be obtained by adjusting the angle of the crop shear knife with respect to the path center line.

[0009] In order to achieve the above object, the present invention also provides that the trailing end of the leading bar material and the leading end of the trailing bar material after being rolled in a rough rolling mill are cut by a crop shear and then joined together, and then they are joined in a finishing rolling mill. In continuous hot sheet rolling equipment that manufactures hot thin sheets by continuous rolling, positioning guides are installed before and after the crop shear to hold the rear end of the leading bar material and the leading end of the trailing bar material, and the bars of these positioning guides are The material holding angle can be adjusted.

[0010] Furthermore, in the present invention, the trailing end of the leading bar material and the leading end of the trailing bar material after being rolled in a rough rolling mill are cut by a crop shear and then joined together, and then continuously rolled in a finishing rolling mill to heat the trailing bar material. In continuous hot thin plate rolling equipment for manufacturing thin sheets, the angle of the crop shear cutter relative to the path center line can be adjusted.

[0011] The continuous right-hand hot thin plate rolling equipment of the present invention is preferably installed on the outlet side of the rough rolling mill, and has a leading and trailing end bending measurement device for measuring the amount of bending of the trailing end of the leading bar material and the leading end of the trailing bar material. Based on the bending amount measured by the measuring means and the measuring means, a cutting angle is calculated to reduce the bending amount in the vicinity of the joint portion when joining the bar materials, and the positioning guide or crop shear is driven so as to obtain this cutting angle. The apparatus further includes a control means.

0012

[Operation] Measure the amount of bending at the rear end of the leading bar material and the amount of bending at the tip of the trailing bar material at the exit side of the rough rolling mill, and based on these amounts of bending, reduce the amount of bending near the joint when joining the bar materials. By calculating the cutting angle and cutting the rear end of the leading bar material and the tip of the trailing bar material to obtain this cutting angle, it is possible to join with a small amount of bending by aligning the end faces straight in subsequent joining. becomes.

The cutting angle may be adjusted by adjusting the bar material holding angle of the positioning guide, or by adjusting the angle of the crop shear blade,
This may be done by adjusting this angle. In the former case, the angle of the bar center line with respect to the pass center line is adjusted, and the cutting angle is adjusted. In the latter case, the angle of the blade relative to the path center line is adjusted, and the cutting angle is adjusted.

[0014]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. FIG. 2 shows the overall configuration of the continuous hot thin plate rolling equipment of this embodiment. Between the rough rolling mill 1 and the finishing rolling mill group 2, a crop shear 5 equipped with positioning guides 3 and 4 at the front and rear, The joining machine 6 and the lifting table 7 are arranged in this order. Also, on the exit side of the rough rolling mill 1, there is a detector 8, such as a television camera, that detects the shape and amount of bending of the front and rear ends of the bar material.
A detector 30 for detecting passage of the rear end of the leading bar material 9 and a detector 31 for detecting passage of the leading end of the trailing bar material are installed on both sides of the shape detector 8. Furthermore, a measuring roll 32 is installed on the exit side of the positioning guide 4 to detect the amount of movement of the rear end of the leading bar material, and on the exit side of the rough rolling mill 1, a measuring roll 32 is installed to detect the amount of movement of the leading end of the trailing bar material. A measuring roll 33 is installed. These detectors 8, 30, 31 and measuring rolls 32, 33
The signal from the computer 11 is sent to the computer 11, and the signal from the computer 11 is sent to the positioning guides 3, 4, the crop shear 5, and the splicing machine 6.
A control signal that drives the is output.

The bar materials 9 and 10 rolled to a thickness of 30 to 80 mm by the rough rolling mill 1 are crop-cut at the front and rear ends by a crop shear 5. During this crop cutting, the computer 11 calculates the optimum cutting angle based on the signals from the detectors 8, 30, 31 and the measuring rolls 32, 33, and cuts the crop at this cutting angle. This will be explained later.

The bar materials 9 and 10 from which the crops at the rear end and the leading end have been cut are guided to the joining machine 6 on the table 12, and the rear end of the leading bar material 9 and the leading end of the trailing bar material 10 are joined to form an endless bar material. The bar material is sent to the finishing mill group 2. Welding may be carried out with the welding machine 6 stationary or while it is running, but when it is carried out between runs, the table 7 moves up and down so that the welding machine 6 can move together with the bar material.

FIGS. 1, 3 and 4 show the positioning guide 3.
, 4 are shown in detail. Each of the positioning guides 3 and 4 includes a width adjustment mechanism that moves the entire body in the board width direction and a guide roll rotation mechanism that tilts the guide tip at an appropriate angle. That is, the guide roll 15 is supported by a rotating frame 16, a sector gear 17 is attached to this rotating frame 16, and the rotating frame 16 is driven by driving the sector gear 17 with an electric motor 19 via a worm 18. Moreover, this rotating frame 16 is connected to the main frame 20.
The main frame 20 is rotatably supported by a screw 21 and a nut 22, and moves on a base 26 in the board width direction to correspond to the board width of the bar material. The screw 21 is driven by an electric motor 24 via a worm mechanism 23 to determine the position of the guide roll 15 in the width direction. nut 2
2 and a conductive motor 24 are attached to a frame 25 fixed to a base 26.

Note that the illustrated positioning guides 3 and 4 may be driven by other methods. For example, a hydraulic motor may be used instead of an electric motor, or it may be driven directly by a hydraulic cylinder.

Next, the principle of the method of cutting the joint end of the bar material according to this embodiment will be explained with reference to FIGS. 5 to 8. First, Figure 5
The case of cutting using a conventional positioning guide will be explained with reference to FIG. There is a bend in the leading and trailing ends of the bar material rolled by a rough rolling mill, and this bending cannot be removed by simply crop-cutting the leading and trailing ends of the bar material with a conventional crop shear equipped with a positioning guide. FIGS. 5(a) and 5(b) show this state. FIG. 5(a) shows a case where the front and rear ends of the bar material are bent in the same direction, and FIG. 5(b) shows a case where the front and rear ends of the bar material are bent in the opposite direction. Therefore, in the past, the front and rear ends of the bar materials were joined with a bend in them, as shown in Fig. 6 (
As shown in a) and (b), the center line 13 of the bar material suddenly changes (offsets) by X with respect to the path center line 14 near the joint. Therefore, due to the subsequent finish rolling, there is a difference in thickness between the operating side and the driving side.
That is, a difference in elongation occurs, which causes threading problems such as narrowing.

In this embodiment, in order to solve this problem,
At the exit side of the rough rolling mill 1, a detector 8 detects the preceding bar material 9.
The pattern of the amount of bending of the rear end and the leading end of the trailing bar material 10 is recognized, and the amount of bending of the bar material near the joint part, that is, the bar material center line relative to the pass center line 14, is determined according to this amount of bending when joining the bar materials. The cutting angle that minimizes the offset amount of No. 13 is calculated. Here, the cutting angle is the angle of the cutting surface 15 with respect to the bar center line 13. Then, in order to obtain this cutting angle, the bar materials 9 and 10 are held by the positioning guides 3 and 4 on the front and rear of the crop shear, the angle of the bar material center line 13 with respect to the pass center line 14 is adjusted, and the bar material is cut with the crop shear 5. Cut the front and rear ends of the material. This state is shown in Figures 7(a) and 8(
Shown in a). FIG. 7 shows a case where the front and rear ends of the bar are bent in the same direction, and FIG. 8 shows a case where the front and rear ends of the bar are bent in the opposite direction. By cutting the rear end of the leading bar material and the tip of the trailing bar material at an optimal angle in this way, as shown in FIGS. 7(b) and 8(b), when joining the bar materials, the leading bar material 9 is simply By positioning and joining the end surfaces of the trailing bar material 10 and the trailing bar material 10, the path center line 1 is
Offset amount x of bar material center line 13 with respect to 4
0, x1, x2, x3, x4 become the minimum.

[0021] Here, x0, x1, x2 are the offset amount of the joining position (x0) when the front and rear ends of the bar materials are bent in the same direction, and the offset amount of the bar materials 9 and 10 (x1, x2). In this case, when all three offset amounts x0, x1, and x2 are equal, that is, when x0 = x1 = x2, the maximum value of the offset amount, that is, the amount of bending becomes the minimum. The calculator 11 performs this calculation and calculates the cutting angle that provides this offset amount.

Furthermore, x3 and x4 are the offset amounts of the bar materials 9 and 10 when the front and rear ends of the bar materials are bent in opposite directions, and in this case, the larger the cutting angle, the more the offset amounts x3 and x4 becomes smaller. Therefore, the calculator 11 stores the maximum cutting angle of the blade 5a that the capability of the crop shear 5 allows, and calculates this as the cutting angle.

Next, the operation of the control system of this embodiment for carrying out the above cutting method will be explained with reference to FIGS. 9 to 11. 9 to 11 are flowcharts showing the processing contents performed within the computer 11, and the circled numbers next to the procedures are reference numbers of the detectors or measuring rolls involved in that procedure.

First, in FIG. 9, when the detector 30 detects the passing of the rear end of the preceding bar material 9 on the exit side of the rough rolling mill 1 in step 100, the measuring roll 3 is detected in step 101.
2, the amount of rear end movement is measured, and in step 102, the amount of bending (deviation from a predetermined width direction position) is measured by the detector 8. Next, in step 103, the amount of bending of the rear end of the preceding bar material is calculated from the measured amount of movement of the rear end and the amount of bending. Similarly, when the detector 30 detects the passing of the rear end of the trailing bar material 10 on the outlet side of the rough rolling mill 1 in step 104, the amount of tip movement is measured by the measuring roll 33 in step 105, and In step 106, the amount of bending (deviation from a predetermined width direction position) is measured by the detector 8, and in step 107, the amount of bending of the leading end of the trailing bar material is calculated from the measured amount of movement of the leading end and the amount of bending. When the amount of bending of the rear end of the leading bar material and the amount of bending of the tip of the trailing bar material are calculated in this way, step 10
Proceeding to 8,109, using these data and the above-mentioned idea, the optimal cutting angle of the rear end of the leading bar material and the leading end of the trailing bar material are determined to minimize the amount of bending near the joint when joining the leading and trailing ends of the bar material. Calculate the optimal cutting angle.

In addition, in FIG. 10, in step 110,
When the detector 31 detects the passing of the rear end of the leading bar material 9 on the entry side of the positioning guide 3, the amount of rear end movement is measured by the measuring roll 32 in step 111.
When it is confirmed in step 2 that the rear end of the preceding bar material 9 has reached the predetermined cutting position on the positioning guide 4, in step 113 the positioning guide 4 is closed to hold the bar material. Next, in order to obtain the optimal cutting angle of the rear end of the preceding bar material calculated in step 108 above, the bar material holding angle of the positioning guide 4 is set in step 114, and the crop shear 5 is driven in step 115 to cut the rear end of the preceding bar material. Cut the crop.

Similarly, in FIG. 11, when the detector 31 detects the passage of the leading end of the trailing bar material 10 on the entry side of the positioning guide 3 in step 120, the measuring roll 33 moves the leading end of the trailing bar material 10 in step 121. When the amount of movement is measured and it is confirmed in step 122 that the tip of the trailing bar material 10 has reached a predetermined cutting position on the positioning guide 3, the positioning guide 3 is closed in step 123 to hold the bar material. Then,
In order to obtain the optimal cutting angle for the leading end of the trailing bar material calculated in step 109 above, the bar material holding angle of the positioning guide 3 is set in step 124, and the crop shear 5 is driven in step 125 to cut the leading end crop. do.

As described above, the rear end of the leading bar material and the leading end of the trailing bar material are cut at the optimum cutting angle as shown in FIGS. By joining straight, it is possible to join with a small amount of bending in the vicinity of the joint as shown in FIGS. 7(b) and 8(b).

As described above, according to this embodiment, the bar material 9
By cutting the leading and trailing ends of , 10, the amount of bending of the bar material after joining is reduced, so it is possible to suppress the meandering of the plate during finish rolling, and it is possible to reduce the narrowing, which is the biggest problem for stable continuous rolling operation. It is possible to eliminate plate threading troubles such as the following. In addition, the shape and bending of the leading and trailing ends of the bar material are measured on the exit side of the rolling mill 1, and the cutting is performed after positioning based on the above measurement results during crop cutting. be understood correctly. Therefore, by utilizing this information in the welding machine 6, it is possible to correctly set the front and rear ends of the bar materials during welding, and it is possible to improve the reliability of the welding. Furthermore, since the cutting is carried out after grasping the shape and bend as described above, it is possible to perform cutting with the highest efficiency in terms of yield.

Another embodiment of the present invention will be explained with reference to FIG. In this embodiment, the angle of the crop shear blade is adjusted instead of adjusting the angle of the positioning guide. That is, in FIG. 12, the positioning guides 3A and 4A are ordinary guides, and the crop shear 5A can adjust the angle of the blade 5a. The turning device for the cutter 5a is the positioning guide 3, which is explained with reference to FIGS. 3 and 4.
It can be configured similarly to the turning device of No. 4. According to this embodiment, by adjusting the angle of the cutter 5a with respect to the center line of the bar material, the cutting angle of the bar material can be adjusted in the same manner as in the first embodiment, and the amount of bending in the vicinity of the joint portion during joining can be adjusted. can be minimized.

[0030]

[Effects of the Invention] Since the present invention is constructed as described above, it has the following effects. (1) When joining the rear end of the leading bar material and the leading end of the trailing bar material, the amount of bending (offset) of the bar material near the joint is reduced, so meandering of the plate during finish rolling can be suppressed to a minimum, and continuous rolling It is possible to eliminate threading troubles such as throttling, which is the biggest problem for stable operation. (2) The shape and bend of the leading and trailing ends of the bar material are measured on the exit side of the rough rolling mill, and the cutting is performed after positioning based on the above measurement results during crop cutting. This information can be used by the cutting machine, making it possible to set the bar material correctly for joining, thereby improving the reliability of joining. (3) Cutting is done after grasping the shape and bend as described above,
It is also possible to perform cutting with the highest efficiency in terms of yield.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a crop shear and positioning guides before and after the crop shear in a continuous hot thin plate rolling facility according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram including a control system of a continuous hot thin plate rolling facility according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of the positioning guide shown in FIG. 1;

FIG. 4 is a cross-sectional view of the positioning guide shown in FIG. 1;

FIG. 5 is a diagram showing the bending of the end of a bar material whose end is crop-cut using a conventional method. FIG. Indicates that it is bent in the opposite direction.

FIG. 6 is a diagram showing the bending in the vicinity of the joint when the front and rear ends of the bar shown in FIG. 5 are joined, and FIG.
), and FIG. 6(b) corresponds to FIG. 5(b).

FIG. 7(a) shows the shape of the end of the bar material which has been crop-cut by the cutting method of the present invention when the front and rear ends of the bar material are bent in the same direction, and FIG. 7(b) It is a figure showing the state where the front and rear ends of this bar material are joined.

FIG. 8(a) shows the shape of the end of the bar material which has been crop-cut by the cutting method of the present invention when the front and rear ends of the bar material are bent in opposite directions, and FIG. 8(b) It is a figure showing the state where the front and rear ends of this bar material are joined.

FIG. 9 is a flowchart showing the operation of the control system shown in FIG. 2, and shows the procedure up to calculating the optimum cutting angle.

FIG. 10 is a flowchart illustrating the operation of the control system shown in FIG. 2, and shows a procedure for cutting the rear end crop of the preceding bar material.

FIG. 11 is a flowchart illustrating the operation of the control system shown in FIG. 2, and shows a procedure for cutting the tip end crop of the trailing bar material.

FIG. 12 is a plan view of a crop shear and positioning guides before and after the crop shear in a continuous hot thin plate rolling facility according to another embodiment of the present invention.

FIG. 13 is a schematic diagram of a conventional hot rolling facility.

FIG. 14 is a diagram illustrating a conventional method of cutting a tip end crop of a bar material.

[Explanation of symbols]

1 Rough rolling mill 2 Finishing rolling mill group 3,4 Positioning guide 5 Cropshire 6　Joining machine 8 Shape detector 9,10 Bar material

Claims (6)

[Claims] [Claim 1] The rear end of the leading bar material and the leading end of the trailing bar material after being rolled in a rough rolling mill are cut and joined using a crop shear, and then continuously rolled in a finishing mill to produce a hot thin plate. In the method of cutting the joint ends of bar materials in continuous hot thin plate rolling equipment, the amount of bending of the trailing end of the leading bar material and the amount of bending of the leading end of the trailing bar material at the exit side of the rough rolling mill is measured, and based on these amounts of bending, A cutting method characterized in that a cutting angle is calculated to reduce the amount of bending in the vicinity of a joint when joining bar materials, and the trailing end of the leading bar material and the leading end of the trailing bar material are cut so as to obtain this cutting angle. 2. The method of cutting a joint end of a bar material according to claim 1, wherein the cutting angle is maintained by positioning guides disposed at the front and rear of the crop shear for the rear end of the leading bar material and the leading end of the trailing bar material; A cutting method characterized in that the cutting method is obtained by adjusting the angle of the bar center line with respect to the pass center line. 3. The method of cutting a joint end of a bar material according to claim 1, wherein the cutting angle is obtained by adjusting the angle of a crop shear blade with respect to a path center line. 4. After rolling in a rough rolling mill, the trailing end of the leading bar material and the leading end of the trailing bar material are cut with a crop shear and then joined together, and then continuously rolled in a finishing rolling mill to produce a hot thin plate. In the continuous hot thin plate rolling equipment, positioning guides for holding the rear end of the leading bar material and the leading end of the trailing bar material are installed before and after the crop shear, and the bar material holding angles of these positioning guides can be adjusted respectively. Continuous hot thin plate rolling equipment featuring: 5. After rolling in a rough rolling mill, the trailing end of the leading bar material and the leading end of the trailing bar material are cut with a crop shear and then joined together, and then continuously rolled in a finishing rolling mill to produce a hot thin plate. Continuous hot thin plate rolling equipment characterized in that the angle of the cutter of the crop shear with respect to the pass center line can be adjusted. 6. In the continuous hot thin plate rolling equipment according to claim 4 or 5, a leading and trailing end bending measurement device is installed on the outlet side of the rough rolling mill and measures the amount of bending of the trailing end of the leading bar material and the leading end of the trailing bar material. Based on the bending amount measured by the measuring means and the measuring means, a cutting angle is calculated to reduce the bending amount in the vicinity of the joint portion when joining the bar materials, and the positioning guide or crop shear is driven so as to obtain this cutting angle. A continuous hot thin plate rolling facility further comprising a control means.