JP4890120B2 - Metal plate joining method and continuous rolling apparatus - Google Patents

Description

  The present invention relates to a method for joining metal plates and a continuous rolling apparatus.

  As a method for joining metal plates, a method for joining metal plates by welding such as a laser method or induction heating method has been conventionally known. In these metal plate joining methods by welding, of the two metal plates to be joined, the rear end of the metal plate (hereinafter referred to as the preceding material) that enters the rolling mill first, and the metal plate that enters the rear of the rolling mill (hereinafter referred to as the following) The trailing material) is abutted against each other, and the abutted portion between the trailing edge of the preceding material and the leading edge of the succeeding material is heated and welded to join.

  In addition, as a method for joining metal plates, a method for joining metal plates by pressure welding is also known. In this joining method by pressure welding, the leading end of the preceding material and the leading end of the following material are overlapped, and the leading material and the following material are simultaneously pressed while cutting the plate by applying a shearing force with the upper blade and the lower blade. Japanese Patent Laid-Open No. 2001-232403 and a rolling pressure welding method are disclosed.

  In general, the rolling state during rolling is most unstable when the front end of the metal plate enters the rolling mill and when the rear end of the metal plate exits from the rolling mill. By joining the succeeding material, continuous and stable rolling becomes possible.

Japanese Patent Laid-Open No. 10-137808 Japanese Patent Laid-Open No. 5-7907 CAMP-JSIJ Vol. 10 (1997) -1093

  However, when the joining portion passes through the rolling mill and the width of either the preceding material or the following material is large, the corner portion 21 of the metal plate 20 having the larger width as shown in FIG. In some cases, problems such as drooping upward or downward may occur. When such a problem occurs, the metal plate may fail to pass through because the plate passing property of the metal plate deteriorates. And when a metal plate fails to pass, rolling must be interrupted for a long time for recovery. In addition, if there is a wrinkling phenomenon, the load at the wrinkled portion is locally increased during rolling, and there is a problem that the material is burned into the roll or the roll is locally damaged.

  Furthermore, when the difference between the width of the preceding material and the following material is large, the work load bender plays a role in controlling the shape of the cross section of the metal plate because the rolling load changes suddenly when the joint passes through the rolling mill. The setting of the plate cross-sectional shape control device such as hydraulic AGC (Automatic Gauge Control) cylinder that plays the role of controlling the plate thickness of the metal plate must be changed abruptly. When the limit of the control capability of the device is exceeded, the rolling state becomes unstable.

  Further, when the metal plates 20 and 22 having different widths are joined as shown in FIG. 7, since the cross section of the joined portion changes suddenly, stress concentration due to rolling tension occurs at the width end portion as shown by F. Although the fracture occurs when the stress at the stress concentration portion exceeds the joint strength, the partial fracture causes an increase in stress due to a reduction in the cross-sectional area, and finally the entire joint portion is instantaneously broken. Therefore, if there is stress concentration at the joint, the allowable fracture resistance of the joint is lowered.

  Moreover, in the said patent document 2, although both the edge part widths of the junction part of a preceding material and a succeeding material are changed, when the width | variety of a metal plate with a narrow width | variety is expanded, the width | variety which can be expanded is small. Furthermore, there is a problem that accuracy when expanding the width is low.

  Moreover, in the said nonpatent literature 1 of the induction heating joining method, in order to prevent that the low joint strength part of a board width both ends opens and fractures | ruptures, the low tension rolling of a junction part and an ear extension shape rolling Is described as valid. Thus, the low joint strength at both ends of the plate width places restrictions on the rolling conditions. In addition to this problem, if the stress concentration at the end of the plate width due to the above-described width difference overlaps, the difficulty of rolling so as not to break is dramatically increased.

  Accordingly, an object of the present invention is to provide a metal plate joining method and continuous rolling equipment capable of continuously rolling metal plates having different widths.

The metal plate joining method according to the first invention (corresponding to claim 1) for solving the above-mentioned problems is as follows.
A width adjusting device including at least one of a sizing press or a roller adjusts the rear end of the preceding metal plate in accordance with the width of the following metal plate, or includes at least one of a sizing press or a roller. With the width adjustment device, adjust the tip of the following metal plate according to the width of the preceding metal plate,
The rear end of the preceding metal plate or the front end of the following metal plate that matches one width is composed of the same width portion having the same width as that of the one metal plate and a tapered portion connected to the same width portion. And
The rear end of the preceding metal plate having substantially the same width is joined to the front end of the subsequent metal plate through the same width portion .

A metal plate joining method according to a second invention (corresponding to claim 2) for solving the above-described problem is a metal plate joining method according to the first invention,
When the preceding metal plate is wider than the following metal plate, the rear end of the preceding metal plate is matched to the width of the following metal plate,
Alternatively, when the following metal plate is wider than the preceding metal plate, the leading end of the following metal plate is adjusted to the width of the preceding metal plate.

Continuous rolling apparatus according to the third aspect of the present invention (corresponding to claim 3) for solving the above problems,
Adjust the trailing edge of the preceding metal plate to the width of the leading edge of the following metal plate, and connect the taper portion and the taper portion to the trailing edge of the preceding metal plate. Provide the same width portion as the width of the tip , or adjust the leading edge of the following metal plate to the width of the trailing edge of the preceding metal plate, the leading edge of the following metal plate , The width adjusting device is provided with at least one of a sizing press or a roller as a width adjusting device provided with the same width portion having the same width as the rear end of the preceding metal plate and a tapered portion connected to the same width portion .

  According to the method for joining metal plates according to the first invention, even if the width of either the preceding material or the following material is large, the corner of the metal plate having the larger width is used to adjust the width. Does not cause problems such as dripping upward or downward. Thereby, since it can prevent that the plate | board property of a metal plate falls, a metal plate does not fail to pass.

Further, since a locally high load during rolling can be avoided, the roll is not damaged.
Moreover, even when the difference between the width of the preceding material and the following material is large, the setting of the plate cross-sectional shape control device such as the work roll bender and the setting of the plate thickness control device such as the hydraulic AGC cylinder are rapidly changed. There is no need. Thus, stable rolling can be performed without exceeding the limit of the control capability of these apparatuses.

In addition, since there is no sudden change in the cross section of the joint, the stress concentration is greatly relaxed. Thereby, the fracture | rupture tolerance tension | tensile_strength of a junction part can be raised.
Further, even when the bonding strength at both ends of the plate width is weak and it is necessary to limit the rolling conditions, the sheet can be rolled in a state substantially equivalent to that when a metal plate having the same width is bonded.

In addition, any width metal plate can be continuously rolled in any order. Thereby, it becomes schedule free, the work efficiency of rolling improves, and cost can be reduced. The leading end of the preceding metal plate and the leading end of the following metal plate, which are matched to one width, are configured by the same width portion and the tapered portion, so that the width of the preceding material and the following material can be matched. It is easy, and the accuracy of width alignment can be increased.

  According to the method for joining metal plates according to the second invention, when the preceding metal plate is wider than the following metal plate, the trailing edge of the preceding metal plate is adjusted to the width of the following metal plate. Or, when the following metal plate is wider than the preceding metal plate, the leading metal plate and the following metal plate are adjusted by adjusting the leading edge of the following metal plate to the width of the preceding metal plate. The present invention can also be applied when there is a large difference in width.

According to the continuous rolling apparatus according to the third aspect of the invention, even if the width of either the preceding material or the following material is large, the corner of the metal plate having the larger width is upward to adjust the width. Or problems such as drowning downward do not occur. Thereby, since it can prevent that the plate | board property of a metal plate falls, a metal plate does not fail to pass.

Further, since a locally high load during rolling can be avoided, the roll is not damaged.
Moreover, even when the difference between the width of the preceding material and the following material is large, the setting of the plate cross-sectional shape control device such as the work roll bender and the setting of the plate thickness control device such as the hydraulic AGC cylinder are rapidly changed. There is no need. Thus, stable rolling can be performed without exceeding the limit of the control capability of these apparatuses.

In addition, since there is no sudden change in the cross section of the joint, the stress concentration is greatly relaxed. Thereby, the fracture | rupture tolerance tension | tensile_strength of a junction part can be raised.
Further, even when the bonding strength at both ends of the plate width is weak and it is necessary to limit the rolling conditions, the sheet can be rolled in a state substantially equivalent to that when a metal plate having the same width is bonded.

  In addition, any width metal plate can be continuously rolled in any order. Thereby, it becomes schedule free, the work efficiency of rolling improves, and cost can be reduced.

  Embodiments of the continuous rolling apparatus and the method for joining metal plates according to the present invention will be described with reference to FIGS. 1 is a schematic view of a continuous rolling apparatus, FIG. 2 is a plan view showing width adjustment of a metal plate, FIG. 3 is a plan view of a joined state of the metal plate, FIG. 4 is a plan view showing width adjustment by a sizing press, and FIG. FIG. 5 is a plan view showing width adjustment by an edger.

  The configuration of the continuous rolling apparatus will be described with reference to FIG. 1, which is a schematic diagram of a continuous rolling apparatus that joins a preceding metal plate and a subsequent metal plate used in this embodiment and performs rolling continuously. The continuous rolling apparatus has a heating furnace 2 installed in the uppermost stream when viewed in the direction in which the metal plate 1 flows, and hereinafter, a first width adjusting device 3a, a rough rolling mill 4, a second width adjusting device 3b, and a coil. Each device is installed in the order of the box 5, the joining device 6, the finish rolling mill 7, and the strip shear 8, and the down coiler 9 is installed in the most downstream.

  Below, the joining method of the metal plate 1 in a continuous rolling apparatus is demonstrated. In the heating furnace 2, the metal plate 1 is heated for rolling. The heated metal plate 1 is sent from the heating furnace 2 to the width adjusting device 3.

  The width of the metal plate 1 sent from the heating furnace 2 to the width adjusting device 3a is adjusted by the width adjusting device 3a. FIG. 2 shows an example of the width adjustment of the metal plate 1. When the width of the succeeding material 11 is wider than the width of the preceding material 10 as indicated by a dotted line Aa, the width is such that the end portion of the following material 11 has a width indicated by an arrow Ac (same width portion). By adjusting the difference and providing a tapered portion as shown by the arrow Ab, the corner of the leading end of the trailing member 11 is not bent and the passing plate does not fail.

  Conversely, when the width of the preceding material 10 is wider than the width of the following material 11, the width of the rear end of the preceding material 10 is adjusted. The same width portion indicated by arrow Ac may be omitted. The metal plate 1 subjected to the width adjustment is sent from the width adjustment device 3 a to the roughing mill 4. If the width adjustment of the metal plate 1 can be sufficiently performed by the width adjustment device 3b, the width adjustment by the width adjustment device 3a may be omitted.

  The metal plate 1 sent from the width adjusting device 3 a to the roughing mill 4 is rolled by the roughing mill 4. At this time, the plate thickness of the metal plate 1 is roughly rolled to a plate thickness that can be joined by the joining device 6 or rolled by the finish rolling mill 7. In order to reduce the thickness of the metal plate 1, one or more rough rolling mills 4 may be installed as necessary. However, if it is not necessary to reduce the thickness of the metal plate 1, the rough rolling mill is used. 4 may not be installed. The rolled metal plate 1 is sent from the roughing mill 4 to the width adjusting device 3b.

  The width of the metal plate 1 sent from the rough rolling mill 4 to the width adjusting device 3b is adjusted by the width adjusting device 3b in the same manner as the width adjusting device 3a. That is, as shown in FIG. 2, when the width of the trailing material 11 is wider than the width of the preceding material 10 as indicated by the dotted line Aa, the width difference between the leading end of the trailing material 11 and the trailing end of the preceding material 10 is When joining in the joining device 6, the corner is tapered as shown by the arrow Ab so that the corner of the leading end of the trailing material 11 is not bent and the passing plate does not fail, and the width of the end The width difference is adjusted so that becomes the width indicated by the arrow Ac.

  Conversely, when the width of the preceding material 10 is wider than the width of the following material 11, the width of the rear end of the preceding material 10 is adjusted. The same width portion indicated by arrow Ac may be omitted. One or a plurality of width adjusting devices 3b are provided. The width-adjusted metal plate is sent from the width adjusting device 3b to the coil box 5. If the width adjustment of the metal plate 1 is sufficiently performed by the width adjustment device 3a, the width adjustment by the width adjustment device 3b may be omitted.

  The metal plate 1 sent to the coil box 5 is wound up by the coil box 5 to form a coil. The coil wound up by the coil box 5 is then developed, and the developed metal plate 1 is sent to the joining device 6.

  The metal plate 1 sent from the coil box 5 to the joining device 6 is joined by the joining device 6. FIG. 3 shows an example of joining of the metal plate 1. The leading edge of the succeeding material and the trailing edge of the preceding material are joined as indicated by B. The joining method may be a welding joining method or a pressure joining method. The metal plate 1 joined by the joining device 6 is sent from the joining device 6 to the finish rolling mill 7.

  The metal plate 1 sent from the joining device 6 to the finish rolling machine 7 is finish-rolled by the finish rolling device 7. One or a plurality of finish rolling mills 7 are installed. The metal plate 1 rolled by the finish rolling mill 7 is sent from the finish rolling mill 7 to the down coiler 9.

  The metal plate 1 sent from the finish rolling mill 7 to the down coiler 9 is cut to an appropriate length by the strip shear 8 and then wound up by the down coiler 9 to form a coil.

  In this embodiment, the width adjusting device 3a is installed between the heating furnace 2 and the rough rolling mill 4, and the width adjusting device 3b is installed between the rough rolling mill 4 and the coil box 5, but the width adjustment of the metal plate 1 is sufficient. If necessary, a width adjusting device 3b between the heating furnace 2 and the roughing mill 4 may be installed as necessary. Alternatively, only one of the width adjusting devices 3b between the rough rolling mill 4 and the coil box 5 may be installed. Further, the place where the width adjusting device 3a or the width adjusting device 3b is installed may be installed anywhere in the continuous rolling device as long as the width of the metal plate 1 can be sufficiently adjusted.

  Moreover, even when the difference between the width of the preceding material and the following material is large, the setting of the plate cross-sectional shape control device such as the work roll bender and the setting of the plate thickness control device such as the hydraulic AGC cylinder are rapidly changed. There is no need. For this reason, stable rolling can be performed without exceeding the limit of the control capability of these apparatuses.

  In addition, any width metal plate can be continuously rolled in any order. For this reason, it becomes schedule free, the work efficiency of rolling improves, and cost can be reduced.

  In this example, a sizing press was used as the width adjusting device. FIG. 4 shows an example of width adjustment by a sizing press. The sizing press is a device that adjusts the width of the metal plate 1 using a mold 12 that can reciprocate as indicated by an arrow C in the width direction of the metal plate 1. It is used to adjust the entire area from the rear end to the rear end.

  In general, the shape of the mold 12 used in the sizing press has a tapered surface as shown by an arrow Da in order to reduce the load during width reduction. For this reason, the width reduction performed conventionally over the whole area is performed only on the front end of the following material 11 or the rear end of the preceding material 10, so that the corner of the metal plate 1 is tapered as indicated by the arrow Db. The width can be adjusted.

  According to this embodiment, the width of the leading end of the leading material 10 or the leading edge of the trailing material 11 can be adjusted and the width-adjusted portion can be formed in a tapered shape, so that the leading material 10 and the trailing material can be formed. Even if one of the widths of 11 is large, there is no problem that the corner of the metal plate 1 having the larger width is bent upward or downward.

Thereby, since it can prevent that the plate | board property of the metal plate 1 falls, the metal plate 1 does not fail in a plate | board passage.
Further, since a locally high load during rolling can be avoided, the roll is not damaged.
In addition, since there is no sudden change in the cross section of the joint, the stress concentration is greatly relaxed. Thereby, the fracture | rupture tolerance tension | tensile_strength of a junction part can be raised.
Further, even when the bonding strength at both ends of the plate width is weak and it is necessary to limit the rolling conditions, the sheet can be rolled in a state substantially equivalent to that when a metal plate having the same width is bonded.
Further, by using a conventionally used sizing press, the cost can be suppressed even when this embodiment is applied.

  In this embodiment, an edger is used as the width adjusting device. FIG. 5 shows an example of width adjustment by the edger. The edger is a device that adjusts the width of the metal plate 1 by using a roller 13 that can reciprocate in the width direction of the metal plate 1, and is conventionally used to adjust the width of the metal plate 1 over the entire area. Yes.

  In FIG. 5, the movement of the roller 13 along the movement of the metal plate 1 is indicated by a dotted line so that the state of the width adjustment can be easily understood, but the roller 13 actually operates only in the width direction as indicated by the arrow H. . By performing width reduction only on the front end of the following material 11 or the rear end of the preceding material 10 over the entire area, the width of the metal plate 1 can be adjusted in a tapered shape as indicated by the arrow Dc. . Alternatively, the width may be adjusted by the roller 13 after cutting an excess portion using a shear (not shown) for cutting the metal plate 1.

  According to this embodiment, the width of the leading end of the leading material 10 or the leading edge of the trailing material 11 can be adjusted and the width-adjusted portion can be formed in a tapered shape, so that the leading material 10 and the trailing material can be formed. Even if one of the widths of 11 is large, there is no problem that the corner of the metal plate 1 having the larger width is bent upward or downward.

Thereby, since it can prevent that the plate | board property of the metal plate 1 falls, the metal plate 1 does not fail in a plate | board passage. Further, since a locally high load during rolling can be avoided, the roll is not damaged.
In addition, since there is no sudden change in the cross section of the joint, the stress concentration is greatly relaxed. Thereby, the fracture | rupture tolerance tension | tensile_strength of a junction part can be raised.
Further, even when the bonding strength at both ends of the plate width is weak and it is necessary to limit the rolling conditions, the sheet can be rolled in a state substantially equivalent to that when a metal plate having the same width is bonded.
Further, by using an edger that has been used in the past, the cost can be suppressed even when this embodiment is applied.

  Here, the above-described sizing press and edger are not only used for adjusting the width of the trailing end of the preceding material and the leading end of the following material, but also performing the normal overall width adjustment.

  The present invention is highly effective when continuously rolling metal plates having different widths.

It is a schematic diagram of a continuous rolling apparatus. It is a top view which shows the width adjustment of a metal plate. It is a top view of the joining state of a metal plate. It is a top view which shows the width adjustment by a sizing press. It is a top view of width adjustment by an edger. It is a top view which shows the bending phenomenon of a metal plate. It is a top view which shows stress distribution of the metal plate with a sudden width change part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate 3 Width adjusting device 6 Joining device 10 Prior material (preceding metal plate)
10a Leading material rear end 11 Backing material (following metal plate)
11a Trailing material tip 12 Mold (sizing press)
13 Laura

Claims (3)

A width adjusting device including at least one of a sizing press or a roller adjusts the rear end of the preceding metal plate in accordance with the width of the following metal plate, or includes at least one of a sizing press or a roller. With the width adjustment device, adjust the tip of the following metal plate according to the width of the preceding metal plate,
The rear end of the preceding metal plate or the front end of the following metal plate that matches one width is composed of the same width portion having the same width as that of the one metal plate and a tapered portion connected to the same width portion. And
A metal plate joining method comprising joining a rear end of a preceding metal plate having substantially the same width and a front end of a subsequent metal plate through the same width portion . In the joining method of the metal plate of Claim 1,
When the preceding metal plate is wider than the following metal plate, the rear end of the preceding metal plate is matched to the width of the following metal plate,
Alternatively, when the following metal plate is wider than the preceding metal plate, the leading end of the following metal plate is matched with the width of the preceding metal plate. Adjust the trailing edge of the preceding metal plate to the width of the leading edge of the following metal plate, and connect the taper portion and the taper portion to the trailing edge of the preceding metal plate. providing the same width of the same width as the front end, or, to adjust to the width of the rear end of the metal plate which precedes the leading edge of the metal plate for the rear row, the tip of the metal plate row after such, the prior A continuous rolling device comprising at least one of a sizing press or a roller as a width adjusting device for providing a width portion having the same width as the rear end of the metal plate and a taper portion connected to the width portion .

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