JP2905022B2 - Splicing of steel strip in continuous annealing line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip in a continuous annealing line which joins the end of a preceding steel strip annealed in a continuous annealing furnace and the beginning of a succeeding steel strip to be fed into the continuous annealing furnace. it relates seaming processing method.

[0002]

2. Description of the Related Art Conventionally, the end of a preceding steel strip annealed in a continuous annealing furnace is welded to the starting end of a succeeding steel strip to be fed into the continuous annealing furnace. And annealed. When the annealed steel strip is subjected to temper rolling by a temper rolling mill, the lap welding portion is crushed by rolling rolls, but particularly when the strip thickness is small, lap welding is performed. The part is hardly crushed,
Since the plate thickness was slightly less than twice, the overlap welding portion remained as a rolling mark on the rolling roll. If the rolling marks remain on the rolling rolls, there is a problem that the rolling marks are transferred to the steel strip subjected to temper rolling, thereby deteriorating the quality. For this reason, the rolling mark of the rolling roll is also polished, but it is difficult to keep the surface gloss uniform in the width direction of the steel strip by polishing, and particularly in the case of a container material,
The unevenness of the surface gloss became a quality problem. Further, when the rolling reduction condition is changed so that the rolling mark does not remain on the rolling roll, there is a problem that a material defect occurs due to insufficient temper rolling.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method in which a rolling mark is transferred to a steel strip during temper rolling so that a rolling mark is not left on a rolling roll by a lap weld during temper rolling. It is to prevent that.

[0004]

SUMMARY OF THE INVENTION The present invention provides a continuous annealing furnace.
Continuous was Unishi'll be welded by overlapping the beginning of the trailing steel band and the end of the preceding steel strip sent from the steel strip roll on the entry side
In the method of joining steel strips in the annealing line,
A joining device with a jointing machine and a grinding machine
At the position where the lap weld between the
Here, the welding of the overlap welding part by the welding machine is performed.
Lap welding by grinding with a grinding machine
Roll of the temper rolling mill during temper rolling
To prevent rolling marks from overlapping welds
Of steel strip in continuous annealing line
This is a joining method .

[0005]

[Function] The lap welding portion is connected to the joint
Grinding with a grinding machine while welding with the welding machine of the alignment device
To reduce the thickness of the lap weld ,
Since the overlap welding portion is not left as a rolling mark on the rolling roll, the rolling mark is not transferred to the steel strip.

[0006]

Next, the present invention will be described in detail with reference to the illustrated embodiment. Reference numeral 1 denotes a continuous annealing furnace, and a preceding steel strip 4 fed from steel strip rolls 2 and 3 is provided on the inlet side of the continuous annealing furnace 1.
A joining apparatus 6 for welding the end of the steel strip 5 and the beginning of the following steel strip 5 is provided, and a temper rolling mill 7 is provided on the exit side of the continuous annealing furnace 1. Further, the joining device 6 includes a welding machine 10 that overlaps and welds the end of the preceding steel strip 4 and the starting end of the following steel strip 5, and the front and back of the overlap welding portion A welded by the welding machine 10. A grinding machine 11 for grinding is provided. The welding machine 10 welds the preceding steel strip 4 and the following steel strip 5 using the upper roll electrode 8 and the lower roll electrode 9.

[0007] The grinding machine 11 grinds the front and back of the overlap welding portion A with an upper grinding wheel 12 and a lower grinding wheel 13.
When it is crushed to 4, it is ground to a thickness that increases by 20 to 40% of the thickness of the steel strip veneer. Reference numeral 15 denotes an electrocleaning section provided on the inlet side of the continuous annealing furnace 1, 16 denotes an inlet looper for adjusting time, 17 denotes an outlet looper for adjusting time, 18 denotes a trimmer, 19 denotes an oiling machine, and 20 denotes a shearing machine. , 21, and 22 are steel strip rolls on the delivery side.

[0008] With the above structure, when the end of the preceding steel strip 4 that has been annealed in the continuous annealing furnace 1 is unwound from the steel strip roll 2, the starting end of the following steel strip 5 is connected to the steel strip. After being unwound from the roll 3, the terminal end of the preceding steel strip 4 and the start end of the following steel strip 5 are overlapped, and then sent to the joining device 6.
Then, the end of the preceding steel strip 4 and the starting end of the following steel strip 5 overlapped by the upper roll electrode 8 and the lower roll electrode 9 of the welding machine 10 are welded. When the preceding steel strip 4 and the following steel strip 5 are welded, the front and back of the overlap welding portion A are ground by a grinder 11.
Are simultaneously ground by the upper grinding wheel 12 and the lower grinding wheel 13.

The amount of grinding at this time is such that when the temper rolling is performed by the rolling rolls 14 of the temper rolling mill 7, the thickness of the crushed lap welding portion A increases by 20 to 40% of the thickness of the steel strip veneer. It is ground to become. The reason why the thickness of the lap welded portion A is increased by 20 to 40% of the thickness of the steel strip veneer is that if it is less than 20%, the strength of the joint portion of the steel strip is insufficient, and the steel strip may be broken during annealing. If it exceeds 40%, a rolling mark remains on the rolling roll 14 during the temper rolling by the temper rolling mill 7.

[0010] While the preceding steel strip 4 and the following steel strip 5 are spliced in this way, the steel strip corresponding to the time adjustment is sent out from the entry side looper 16 to the continuous annealing furnace 1. The preceding steel strip 4 can be stopped by the length of the steel strip for the time adjustment. When the preceding steel strip 4 and the following steel strip 5 are spliced, the entrance looper 16 winds the steel strip corresponding to the time adjustment to prepare for the next splicing. The spliced steel strip is cleaned in the electro-finish section 15 and then sent to the continuous annealing furnace 1 for annealing.

After the annealing, the steel strip is temper-rolled to a desired property by a temper rolling mill 7 provided on the outlet side of the continuous annealing furnace 1, and then subjected to an oiling process by an oiling machine 19. It will be wound around the steel strip roll 21 on the delivery side. Then, when the overlap welding portion A appears, the shearing portion A
Is cut, so that the preceding steel strip 4 is wound around the steel strip roll 21 and carried out, and the starting end of the following steel strip 5 is wound around the next steel strip roll 23.

During this operation, the trailing steel strip 5 annealed and fed out is wound around the exit looper 17 for adjusting the time, so that the starting end of the trailing steel strip 5 may be stopped. it can. In the second embodiment shown in FIG. 3, the grinding machine 11 is replaced with belt sanders 12a, 13a instead of the upper grinding wheels 12, 13.
Since it is the same as the first embodiment except that the running cost is reduced by using a, the same reference numerals are given and the description is omitted. Further, in the first and second embodiments, the welding machine 10 and the grinding machine 11 are provided side by side, and the welded portion is ground while performing the welding to shorten the joining time, and the amount of time adjustment by the entrance looper 16 is performed. but it is not to increase. Simultaneously grinding the front and back of the weld overlay with or grinder 11 scales to shorten the grinding time, the time adjustment amount by the inlet side looper 16 is prevented from increasing, be ground sides separately The good thing is, of course.

[0013]

According to the present invention, as is apparent from the above description, the rolled mark is left by grinding the joined lap welded portion to such a thickness that no rolled mark remains on the rolling roll of the temper rolling mill. Since the rolling marks can be crushed without being rolled, the rolling marks are not transferred to the annealed steel strip by the rolling rolls and the quality does not deteriorate. In addition, since no rolling marks remain, there is no need to perform polishing on the rolling rolls, so that the number of working steps can be reduced, and in addition, unevenness in surface gloss due to polishing does not occur.
High quality container materials can be provided. Welding and grinding of lap welds is performed between the leading steel strip and the succeeding steel strip.
Welder and grinder at the position where the lap weld stops
Using a welding machine with a seaming device
Grinding with a grinder is performed while welding the joint weld.
Therefore, the thickness of the overlap welding portion is reduced, so that it is not necessary to change the rolling condition of the rolling roll of the temper rolling mill, so that the temper rolling can always be performed under the appropriate rolling condition. In spite of the fact that there is no defect in the material of the steel strip, the joint processing of the steel strip in the continuous annealing
It is an extremely large method that contributes to the development of the industry as a logical method.

[Brief description of the drawings]

FIG. 1 is a schematic view of a continuous annealing furnace showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a first embodiment of the splicing device of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the splicing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Continuous annealing furnace 4 Leading steel strip 5 Trailing steel strip 6 Splicing device 7 Temper rolling mill 10 Welding machine 11 Grinding machine 14 Rolling roll A Lap welding part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C21D 9/52, 9/56 B21B 15/00 B23K 37/08 B24B 9/04

Claims (1)

(57) [Claims] 1. Feeding from the steel strip roll to the entrance side of the continuous annealing furnace
It is to come of the preceding steel strip trailing steel band and the end of the beginning and the superposition of the steel strip in the continuous annealing line was I Unishi to welding
In the seaming method, a welding machine and a grinding machine are
Of the preceding and subsequent steel strips
Place it where the weld stops, and
Grinding with a grinder while welding the overlap welding part
To reduce the thickness of the lap weld,
Sometimes welded by overlapping the rolls of the temper rolling mill
Seaming processing method of the steel strip in the continuous annealing line, characterized in that as rolling mark does not remain.