JP2003251410A - Combined manufacturing facility of cold-rolled steel sheet and plated steel sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined manufacturing facility of a cold-rolled steel sheet and a plated steel sheet with which interference between the pass route of the plated steel sheet and the pass route of the cold-rolled steel sheet is avoided, the modification of an existing line is facilitated and the cost of equipment is reduced. <P>SOLUTION: In the combined manufacturing facility of the cold-rolled steel sheet and the plated steel sheet having a pass switching apparatus for switching the plating pass route for supplying a steel sheet taken out of an annealing furnace to a plating device and manufacturing the plated steel sheet and the cold-rolling pass route for manufacturing the cold-rolled steel sheet without passing the steel sheet taken out of the annealing furnace through the plating device, a plurality of helical turn rolls for obliquely changing the pass route of the steel sheet are installed in the poststage of the pass switching apparatus. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined production facility for cold-rolled steel sheets and galvanized steel sheets for producing cold-rolled steel sheets and galvanized steel sheets using the same equipment.

[0002]

2. Description of the Related Art Conventionally, a plated steel sheet for plating the surface of a steel sheet and a cold-rolled steel sheet for which an annealing treatment is applied to the steel sheet to adjust the surface oxide film and processing characteristics have been manufactured using different lines. . A production line for plated steel sheets and cold-rolled steel sheets includes a cleaning device that is an inlet side device of an annealing furnace that anneales the steel plate that is the original plate, and a temper rolling device, an oil coating device, and a winding device that is an output side device. Etc. are the same configuration, but in order to share these devices, there is a problem that switching work of steel plates is required, and that it takes time and effort to ensure the quality of the steel plates after switching. there were.

As a countermeasure against this, for example, JP-A-58-7
Japanese Patent No. 1366 discloses a manufacturing facility for separately forming a cold-rolled steel sheet and a plated steel sheet by providing means for bypassing the plating apparatus. However, in this conventional technology, although the outline of the bypass means is shown, since the specific method of changing the path route has not been sufficiently studied, it is not possible to realize a combined manufacturing facility for cold-rolled steel sheets and plated steel sheets. It hasn't arrived. Specifically, while avoiding the interference between the path route of galvanized steel sheet and the path route of cold-rolled steel sheet, or modifying the existing equipment to make the cold-rolled steel sheet and galvanized steel sheet combined manufacturing equipment, while operating the existing line. There was no established method for remodeling or reducing equipment costs.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the prior art as described above, avoids the interference between the path route of the plated steel sheet and the path route of the cold rolled steel sheet, and makes it easy to modify the existing line. It is an object of the present invention to provide a combined manufacturing facility for cold-rolled steel sheets and plated steel sheets that can reduce equipment costs.

[0005]

According to the present invention, a plurality of helical turn rolls for changing the passing direction of a steel sheet are installed in a plating pass route or a cold rolling pass route.
It is intended to provide a combined production facility for cold-rolled steel sheets and plated steel sheets, which avoids interference between the coated steel sheet path routes and cold-rolled steel sheet path routes, and can easily modify existing lines and reduce equipment costs. The gist thereof is the following contents as described in the claims.

(1) A plating pass route for producing a plated steel sheet by supplying a steel sheet discharged from an annealing furnace to a plating apparatus, and a cold rolling steel sheet for manufacturing a cold rolled steel sheet without passing the steel sheet discharged from the annealing furnace through the plating apparatus. In a combined manufacturing facility for cold-rolled steel sheets and galvanized steel sheets that has a path switching device for switching to the rolled path route, installing a plurality of helical turn rolls that change the steel sheet passing direction on the galvanized path route or cold rolled path route. Combined production facility for cold-rolled steel sheet and plated steel sheet. Here, the plating apparatus includes various plating apparatuses such as an electroplating apparatus and a vapor deposition plating apparatus in addition to a hot-dip galvanizing apparatus and an alloy hot-dip galvanizing apparatus. (2) The combined manufacturing facility for cold-rolled steel sheet and plated steel sheet according to (1), wherein the helical turn roll has a non-oxidizing gas blowing means for floating the steel sheet from the pass line. (3) Use of the cold rolled steel sheet and the plated steel sheet according to (1) or (2), characterized in that the atmosphere in the plating pass route and the cold rolling pass route, which are divided by the pass switching device, is made to be an inert gas. production equipment.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a combined production facility for cold-rolled steel sheets and plated steel sheets according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a diagram showing the equipment configuration of a combined production facility for cold-rolled steel sheets and plated steel sheets according to the present invention.

On the upstream side of the hot dip coating apparatus 9, the payoff reel 1, the welding machine 2, the hot side washing apparatus 3, the hot side loop car 4, and the annealing furnace 5 of the hot side equipment 6 are provided. On the downstream side, the water cooling tank 1 included in the outlet facility 14
1, a skin pass mill 12, a post-treatment device 13, an exit side loop car 15, a trimmer 16, an inspection room 17, and a tension reel 18 are arranged respectively, and the entrance side equipment 6 and the exit side equipment 14 are steel plates of a plurality of types. It is an elemental facility that is commonly used when manufacturing. Here, the payoff reel 1 pays out the steel plate, and the welding machine 2
Is to connect the rear end of the preceding steel plate and the front end of the following steel plate and continuously convey the steel plate to the hot dipping device 9. In addition, the inlet and outlet loop cars 4 and 15 are provided to enable continuous transport of the steel sheet supplied to the hot dip coating apparatus 9 and the steel sheet discharged from the hot dip coating apparatus 9, respectively, without temporary stop. Plays the role of a buffer. The tension reel 18 is for winding and collecting the manufactured steel plate.

FIG. 2 is a detailed view of the switching portion between the cold rolling pass route and the plating pass route in the present invention. The route from X to Y indicated by the dotted line in FIG. 2 is the cold rolling pass route 7.
The route from X to Y indicated by the solid line is the plating pass route 8. Pass switching devices 10 and 10 'are provided at the switching portion between the cold rolling pass route 7 and the plating pass route 8. When manufacturing a cold rolled steel plate, the steel plate is connected to the dotted cold rolling pass route by a pass switching roll 19. When manufacturing a plated steel sheet, the steel sheet is connected to the solid-line plating path route 8.

Helical turn rolls 20 and 20 'are installed in the subsequent stage of the path switching device 10 on the entry side of the plating path route 8. By changing the passing direction of the steel sheet of the plating path, the pass line of the plated steel sheet is changed. The cold rolled steel sheet pass line and the equipment width direction are shifted. By doing so, it is possible to avoid interference between the cold rolling pass route and the plating pass route. A pot 21 is installed in the plating pass route 8, and after the galvanization is continuously performed here, the pot 21 joins the cold rolling pass route again through the steel plate ascending path 27 and the steel plate descending path 31.

On the plating path route, in addition to the transport rolls 22 and 28 for changing the direction, the plating adhesion amount control device 2
3. There are alloying furnaces 24 and 25. In addition, the vibration damping device 2
6 and 30 prevent flapping of the steel plate. Further, helical turn rolls 29, 29 'are also installed in the subsequent stage of the plating pass route, and by again turning the pass line diagonally, the pass line is returned to its original position in the equipment width direction, and the cold It matches the pass line of the rolled steel sheet. Thereafter, the path switching device 10 'merges the cold switching path route with the path switching roll 32. Accordingly, the plating apparatus can be installed while operating the cold-rolled steel sheet manufacturing equipment, so that the equipment can be easily modified and the equipment cost can be reduced.

On the other hand, the cold rolling pass route 7 goes straight from the pass switching device 10 and joins with the plating pass route by the pass switching device 10 '. In the present embodiment, the plating pass route 8 is replaced by the helical turn roll 20,
Although interference with the cold rolling pass route 7 is avoided by changing the steel sheet passing direction by 20 ', 29, 29', conversely, by installing a helical turn roll in the cold rolling pass route, It is also possible to avoid the interference. In this case, the helical turn roll can also be used as a roll cooling device for the steel plate. Sealing devices 33 and 34 are installed on the upstream side of the path switching device 10 and on the downstream side of 10 'to prevent the oxidation of the steel plate surface by keeping the atmosphere in the path switching section pipe in an inactive state. ing. The inert gas is preferably N2 gas or N2 gas containing 0.1 to 1% of H2.

FIG. 3 is a perspective view of a plating pass route according to the embodiment of the present invention. Helical turn roll 2
It can be seen that after 0 and 20 ', the passing direction of the steel sheet is changed to shift the pass line in the width direction of the equipment, the helical turn rolls 29 and 29' restore the path.
In addition, in the present embodiment, in the existing cold-rolled steel sheet manufacturing equipment,
Although a new plating equipment was installed, a large number of helical turn rolls were installed to connect the existing cold-rolled steel sheet manufacturing equipment with the existing galvanized steel sheet manufacturing equipment, without major equipment modification. It is also possible to realize a combined production facility for cold-rolled steel sheets and plated steel sheets.

FIG. 4 is a view showing the structure of the helical turn roll used in the present invention. The non-oxidizing gas is supplied to the hollow roll, and the non-oxidizing gas is sprayed from the nozzle provided on the roll surface onto the steel sheet surface, so that the steel sheet does not come into direct contact with the roll surface and the direction of the pass line of the steel sheet is changed You can Since the steel sheet and the roll do not come into direct contact with each other, it is possible to prevent flaws and stains on the surface of the steel sheet, so that the present invention can be applied to plated steel sheets that require strict control of surface properties. Furthermore, hot-dip galvanizing and vapor deposition plating are performed at a high steel plate temperature of several hundred degrees, so by spraying a non-oxidizing gas to float,
It is possible to prevent a heat buckle that causes plate breakage due to meandering due to heat crown due to thermal expansion of rolls and buckling phenomenon due to thermal strain of the steel plate.

[0015]

According to the present invention, a plurality of helical turn rolls for obliquely changing the path route of the steel sheet are installed in the subsequent stage of the path switching device for plating and cold rolling, whereby the path route of the plated steel sheet and the cold rolled steel sheet are installed. It is possible to provide a combined production facility for cold-rolled steel sheets and galvanized steel sheets that avoids interference with the above-mentioned path route and that can easily modify the existing line and reduce equipment costs. Play.

[Brief description of drawings]

FIG. 1 is a diagram showing a facility configuration of a combined production facility for cold-rolled steel sheets and plated steel sheets according to the present invention.

FIG. 2 is a detailed view of a switching portion between a cold rolling pass route and a plating pass route in the present invention.

FIG. 3 is a perspective view of a plating pass route according to the embodiment of the present invention.

FIG. 4 is a diagram showing a structure of a helical turn roll used in the present invention.

[Explanation of symbols]

1: Payoff reel 2: Welder 3: Entry side cleaning device 4: Incoming loop car 5: Annealing furnace 6: Entry side equipment 7: Cold rolling pass route 8: Plating path route 9: Plating equipment 10, 10 ': Path switching device 11: Water cooling tank 12: Skin pass mill 13: Post-processing device 14: Delivery side equipment 15: Exit loop car 16: Trimmer 17: Inspection room 18: Tension reel 19: Path switching roll 20, 20 ': Helical turn roll 21: pot 22: Transport roll 23: Plating adhesion amount control device 24, 25: Alloying furnace 26: Vibration control device 27: Steel plate rising path 28: Transport roll 29, 29 ': Helical turn roll 30: Vibration control device 31: Steel plate descending path 32: Path switching roll 33, 34: Sealing device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigenori Tanaka             2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan             Steelmaking Co., Ltd. F term (reference) 4E026 EA02 EA10 EA11 GA02 GA10                 4K027 AA05 AA22 AD02 AD11

Claims (3)

[Claims] 1. A plating pass route for producing a plated steel sheet by supplying a steel sheet discharged from an annealing furnace to a plating apparatus, and a cold rolling method for producing a cold rolled steel sheet without passing the steel sheet discharged from the annealing furnace through the plating apparatus. In a combined manufacturing facility for cold-rolled steel sheets and galvanized steel sheets that has a path switching device that switches between the path roots, it is possible to install a plurality of helical turn rolls that change the passage direction of the steel sheets in the plating path roots or the cold rolling path roots. Characteristic cold rolling steel sheet and galvanized steel sheet combined production facility. 2. The combined production facility for cold-rolled steel sheet and plated steel sheet according to claim 1, wherein the helical turn roll has a non-oxidizing gas blowing means for floating the steel sheet from the pass line. 3. The cold rolled steel sheet and the plated steel sheet according to claim 1 or 2, wherein the atmosphere in the plating pass route and the cold rolling pass route, which are divided by the pass switching device, is an inert gas. Combined manufacturing equipment.