KR101230193B1 - Apparatus for manufacturing cold rolled stainless coil by semi-sequential way - Google Patents

Abstract

The present invention provides a continuous cold rolling device comprising a first uncoiler installed at an inlet end to unwind a hot rolled stainless coil, and a continuous rolling machine for cold rolling the hot rolled strip discharged from the first uncoiler; A first coiler winding the cold rolled strip discharged from the continuous mill with a cold rolled coil; Transfer means for transferring the cold rolled coil; An integrated annealing and pickling system comprising a second uncoiler for unwinding the cold rolled coil produced by the first coiler, an annealing furnace and a pickling facility for continuously annealing the cold rolled strip discharged from the second uncoiler; And a second coil provided on the exit side of the integrated annealing pickling plant to wind up the cold rolled strip passing through the pickling plant, wherein the conveying means transfers the cold rolled coil from the first coil to the second uncoiler. Or lowering the production yield of the cold rolled stainless steel coil manufacturing apparatus according to the semi-continuous method, wherein the cold rolled coil produced by the first coiler is transferred to the first uncoiler of the continuous cold rolling facility to re-roll. It can improve the yield of cold rolled stainless coils.

Description

Cold Rolled Stainless Steel Coil Manufacturing Equipment by Semi-Continuous Method {APPARATUS FOR MANUFACTURING COLD ROLLED STAINLESS COIL BY SEMI-SEQUENTIAL WAY}

The present invention relates to an apparatus for manufacturing cold rolled stainless coils, and more particularly, by continuously rolling a hot rolled strip in a continuous cold rolling facility, winding it with a cold rolled coil, and annealing the cold rolled coil in an integrated annealing plant, followed by winding with a cold rolled stainless coil. The present invention relates to a cold rolled stainless steel coil manufacturing apparatus based on a semi-continuous method capable of achieving a reduction in production cost while maximizing operating efficiency of a cold rolling facility.

In general, stainless steel sheets (hot bands, ie black bands) produced by hot rolling of the strip or by strip casting are subjected to annealing, shot blasting and pickling. It is converted into a white band through a pickling process such as). The white steel sheet is manufactured into a cold rolled steel sheet, that is, a final dimension product, through a cold rolling process. These final dimension products are annealed to remove internal stresses, soften steels or adjust the crystal structure. If necessary, the annealed final dimension product is corrected in the correction line, plated and processed into high value products.

As described above, in order to manufacture a hot rolled steel sheet into a cold rolled steel sheet, a number of unit processes such as a hot rolled steel sheet annealing process, a hot rolled steel sheet pickling process, a cold rolling process, and a cold rolled steel sheet annealing process are required and corrected as necessary. Many unit processes are required, such as processes and / or plating processes. In each of the unit processes, a pay off reel for unwinding the coil is provided at the entry side, and a tension reel for winding the strip is provided at the exit side. In manufacturing, relatively high installation costs are required.

Since one unit process is not affected by another unit process, the operation efficiency of each unit process can be maximized. However, there is a relatively large production time as well as a relatively excessive installation cost, which requires additional facilities for winding up and unwinding the product produced in each unit process and for transferring the product between the unit processes. As a result, there was a limit to the yield of cold rolled steel sheet by unit processes.

In order to solve the above problems, a method of manufacturing a cold rolled steel sheet has been conventionally proposed by a single-continuous operation of directly connecting a plurality of unit processes.

For example, in US Patent Nos. 5,606,787 and 5,197,179, as shown in Figs. 1 and 2, a rolling mill for rolling a hot rolled steel strip to a thickness of a final dimension, an annealing zone, and a pickling zone are continuously provided. A continuous process line for producing final dimension products is disclosed. However, this continuous process line has the following problems.

1) Production yields are different in rolling mills, annealing zones and pickling zones. These differences in yield have limited the production yield of final dimension products.

2) Rolling process, annealing process and pickling process are carried out continuously. In case of failure in annealing zone or pickling zone, continuous process line should be stopped as a whole.

3) In the rolling mill, the size of the final product was limited due to the reduction in the rolling reduction ratio for the hot rolled steel sheet by the number of roll mill stands installed.

Therefore, there is a need for an apparatus and a method capable of manufacturing a cold rolled steel sheet having a final dimension with a relatively low yield and high yield in a short time.

The present invention has been proposed to solve the conventional problems as described above, while maximizing the operation efficiency of the cold rolling equipment cold rolled stainless coil by the semi-continuous method to maximize the production amount of the cold rolled stainless coil and lower the production cost The object is to provide a manufacturing apparatus.

Another object of the present invention is to provide an apparatus for manufacturing cold rolled stainless coils in a semi-continuous manner in which the annealing pickling equipment can operate normally without being affected by the operating state of the cold rolling equipment.

In addition, the present invention is a cold rolling stainless coil manufacturing apparatus that can improve the rolling speed while improving the surface quality of the final product by using neat oil in place of emulsion type rolling oil in order to improve the rolling speed in cold rolling equipment The purpose is to provide.

In order to achieve the above object, according to the present invention, the apparatus for manufacturing a cold rolled stainless coil according to the semi-continuous method of the present invention includes a first uncoiler installed at an inlet end to unwind a hot rolled stainless coil, and discharged from the first uncoiler. Continuous rolling equipment consisting of a continuous rolling mill for cold rolling the hot rolled strip to be; A first coiler winding the cold rolled strip discharged from the continuous mill with a cold rolled coil; Transfer means for transferring the cold rolled coil; An integrated annealing and pickling system comprising a second uncoiler for unwinding the cold rolled coil produced by the first coiler, an annealing furnace and a pickling facility for continuously annealing the cold rolled strip discharged from the second uncoiler; And a second coil provided on the exit side of the integrated annealing pickling plant to wind up the cold rolled strip passing through the pickling plant, wherein the conveying means transfers the cold rolled coil from the first coil to the second uncoiler. Or to transfer the cold rolled coil produced by the first coil to the first uncoiler of the continuous cold rolling facility.

The cold rolled stainless coil manufacturing apparatus may be operated so that the following cold rolled coil may temporarily wait while the preceding cold rolled coil is unwound from the second uncoiler.

The cold rolled strip unwound by the second uncoiler may be connected by welding a trailing end of the preceding cold rolled strip and a trailing end of the subsequent cold rolled strip in a welder.

The cold rolled strip unwound by the first uncoiler may be cold rolled after connecting the rear end of the preceding cold rolled strip and the leading end of the subsequent cold rolled strip by welding in a welder.

The apparatus may further include a degreasing and cooling system installed between the continuous mill and the first coiler to degrease and cool the cold rolled strip discharged from the continuous mill.

The apparatus may further include a defect detection device installed in front of the first coil to detect surface defects of the cold rolled strip discharged from the continuous mill.

The apparatus may further include a degreasing facility installed between the second uncoiler and the annealing furnace to degrease the cold rolled strip entering the annealing furnace.

In addition, according to the present invention, a method for manufacturing a hot rolled stainless coil into a cold rolled stainless coil by a semi-continuous method comprises: unwinding the hot rolled stainless coil into a hot rolled strip; Continuously cold rolling the hot rolled strip to produce a cold rolled strip; Winding the cold rolled strip with a cold rolled coil; Unwinding the cold rolled coil with a cold rolled strip to perform annealing; In addition, the annealing pickled cold rolled strip characterized in that it consists of a step of rewinding.

According to the present invention, it is possible to effectively produce a hot rolled stainless coil as a cold rolled stainless coil for a relatively short process time by lowering production yield and increasing cost by separately installing the continuous cold rolling facility and the integrated annealing pickling facility.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which showed schematically the structure of the prior art example which manufactures a cold rolled stainless coil.
2 is a view schematically showing a configuration of another conventional example of manufacturing a cold rolled stainless coil;
Figure 3 is a block diagram schematically showing the configuration of a cold rolled stainless steel coil manufacturing apparatus according to the present invention;
4 is a block diagram of a continuous cold rolling facility of the cold rolled stainless steel coil manufacturing apparatus according to the present invention;
5 is a configuration of the integrated annealing pickling equipment of the cold rolled stainless steel coil manufacturing apparatus according to the present invention;
6 is a view showing the configuration of a cold rolled stainless coil manufacturing apparatus according to an embodiment of the present invention.

Specific details of other embodiments are included in the detailed description and the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. In the following description, when a part is connected to another part, it is only directly connected. It also includes a case in which another device is electrically connected in the middle. In the drawings, parts not relating to the present invention are omitted for clarity of description, and like parts are denoted by the same reference numerals throughout the specification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, in particular the term 'hot rolled stainless coil' herein refers to annealing a coil or strip cast strip wound after hot rolling and annealing the strip. After the cold rolled coil refers to a coil, the cold rolled coil of the cold rolled coil and wound, the cold rolled stainless coil refers to a coil wound after pickling the strip of cold rolled coil .

In addition, the term 'semi-sequential way' is intended to distinguish the concept of the unit process described above and the concept of a continuous process or a continuous process line as described below. The process takes place.

First, referring to FIG. 3, the apparatus 100 for manufacturing a cold rolled stainless steel coil according to the present invention may be a hot rolled or annealed hot rolled strip or a strip casted and annealed hot rolled strip. Cold rolling facility 110, cold rolling coiler 120 for winding cold rolled cold rolled strip, integrated annealing pickling facility 130 for annealing cold rolled strip, and anhydrous acid for winding annealed strip It is comprised of the washing coiler 140.

Referring to FIG. 4, in the continuous cold rolling facility 110, an uncoiler 112 for cold rolling for winding up and unrolling the hot rolled stainless coil 102 into a hot rolled strip is provided at the inlet end. The hot rolled strip discharged from the cold rolled uncoiler 112 is cold rolled while passing through the continuous mill 114. At this time, the thickness of the hot rolled strip is reduced to the thickness of the target dimension.

Continuous rolling machine 114 is used a three or more tandem rolling mill (Z-Hi Mill) to cold-roll the hot rolled strip to a cold rolled strip of the museum. Tandem rolling mills include, but are not limited to, inserting an intermediate roll between a back up roll and a work roll, for example, so that the upper three rolls and the lower three rolls are vertical. It can be configured as a rolling mill to be six stages.

In tandem rolling mills, the work roll has a relatively small diameter, for example about 200 mm or less, preferably about 160 mm or less. As a result, it is possible to produce a product having a higher value of a thin product. In addition, since the tandem rolling mill is composed of three or more stands, the hot rolled strip passing through the continuous rolling mill 114 is cold rolled in an irreversible manner.

Rolled oil is used to cool the heat generated during cold rolling in the continuous mill 114 and reduce friction. At this time, the rolled oil is used to secure the cooling ability and friction reduction effect as well as to secure the product gloss (neat oil). Such knitted oil is sprayed at an optimum spraying amount per stand of the rolling mill and has a viscosity of about 10 to 30 to secure oil film stability. This is because when the injection amount is less than the proper amount, the cooling effect by the rolling oil is insignificant, whereas when the injection amount is exceeded, the supercooling phenomenon appears. In addition, when the viscosity is less than 10, the friction reducing effect is insignificant, and when the viscosity is greater than 30, the friction amount is excessive to cause surface defects. Therefore, it is preferable that the viscosity of rolled oil is about 10-20.

Reference numeral 116 is a welding machine for connecting the rear end of the preceding strip and the leading end of the trailing strip discharged from the cold rolling uncoiler 112, and reference numeral 117 prepares and mounts the hot rolled stainless coil 102 at the entrance side. Or a side looper that temporarily stores a hot rolled strip that proceeds to the continuous mill 114 to compensate for the welding time in the welder 116.

According to the present invention, a cold rolled coiler 120 for winding a cold rolled strip produced from the continuous mill 114 is provided at the discharge end of the continuous cold roll facility 110. Thus, the cold rolled strip is wound into the cold rolled coil 104 through the cold rolled coiler 120. The cold rolled coil 104 may be directly injected into a subsequent process facility, for example, an integrated annealing plant 130 or a continuous cold rolled plant 110, or a cold rolled uncoiler 112 to produce a thinner product. Transfer to the first uncoiler can be re-rolled. At this time, in the case of re-rolling, the exit steel strip temperature is 50 ° C or less. In addition, the cold rolled coil may be conveyed by a conveying means, which conveys the cold rolled coil from the first coil of the cold rolling coiler 120 to the second uncoiler of the annealing pickling coil 132. Or to the first uncoiler, which is the cold rolling uncoiler 112 of the continuous cold rolling facility, to re-roll the cold rolled coil produced by the first coiler, which is the cold rolling coiler 120. You can.

Referring to Figure 5, the integrated annealing pickling facility 130 annealing the cold rolled strips discharged from the annealing pickling uncoiler 132 and the annealing pickling uncoiler 132 to unwind the cold rolled coil 104. And an annealing furnace 134 for pickling, and a pickling facility 136 for pickling the annealing strip. The cold rolled strip may be continuously annealed by the annealing furnace 134 and the pickling facility 136.

Annealing furnace 134 is a furnace for heating the cold rolled strip to induce internal stress relief and recrystallization of the cold rolled strip. The annealing furnace 134 is a preheating zone, a heating zone, a cracking zone, a slow cooling zone, a quenching zone, an overaging zone, and a final cooling zone. And it can be divided into a water cooling stand and the like.

The pickling facility 136 adopts a neutral salt electrolytic pickling method to secure the surface glossiness of the annealed strip.

Reference numeral 137 is a welding machine for connecting the rear end of the preceding strip and the leading end of the trailing strip discharged from the annealing pickling uncoiler 132, and reference numeral 138 prepares a cold rolled coil at the entrance or at the welding machine 137 The side looper temporarily stores the hot rolled strip that proceeds to the annealing furnace 134 in order to compensate for the welding time. In addition, reference numeral 139 is a degreasing facility for removing foreign matter present on the surface of the cold-rolled strip discharged from the annealing annealed uncoiler 132.

According to the present invention, in order to wind up the strip passing through the pickling plant 136, an annealing pickling coiler 140 is provided on the exit side of the integrated annealing plant. By winding the strip pickled by the annealing pickling coiler 140, a cold rolled stainless coil 106 as a final product is provided.

On the other hand, the semi-continuous cold-rolled stainless steel coil manufacturing apparatus according to the present invention further has a degreasing and cooling device 152 installed in the discharge end of the continuous mill 114, as shown in FIG. This is applied to the surface of the cold rolled strip passed through the continuous rolling mill 114 so that the cold rolling coil 104 wound in the cold rolling coiler 120 can be cold rolled again in the continuous rolling mill 114 as described below. This is to remove foreign matter present and to sufficiently cool the cold rolled strip.

Preferably, a defect detector 154 is provided between the degreasing and cooling device 152 and the cold rolling coiler 120 to automatically operate to detect surface defects of the strip. This is because it is almost impossible for the operator to visually detect the surface defect of the cold rolled strip passing through the continuous mill 114 at high speed.

On the other hand, the skin pass rolling mill 162, the degreasing apparatus 164, the flattening apparatus 166, and the defect inspection apparatus 168 are provided in the discharge end of the pickling installation 136 sequentially. The skin pass rolling mill 162 is a facility for roughly rolling the pickled strip to correct the shape of the strip, improve mechanical properties, and improve surface roughness. The degreasing device 164 is a device for removing foreign matter from the surface of the pickled strip, and the flattening device 166 is a device for correcting deformation of the pickled strip. And, the flaw detector 168 is a device for detecting the surface defects of the pickled strips, to provide a good quality end product.

At this time, the reference numeral 161 is an exit looper for temporarily storing the strip passing through the pickling equipment 136, thereby preventing the strip from passing through the pickling equipment 136 at a constant speed to prevent over-acid or non-pickling. Can be. In addition, the apparatus for manufacturing a stainless coil may be operated so that the following cold rolled coil may temporarily wait while the preceding cold rolled coil is unwound from the second uncoiler, which is the annealing annealed uncoiler 132.

Hereinafter will be described the operation of the cold rolled stainless steel coil manufacturing apparatus 100 by a semi-continuous method according to the present invention.

First, the coil wound after hot rolling and annealing the strip, or the coil wound after annealing the strip cast strip, that is, the hot rolled stainless coil 102 of the cold rolled stainless steel coil manufacturing apparatus 100 according to the present invention It is transferred to the continuous cold rolling facility (110). The hot rolled strip provided by unrolling the hot rolled stainless coil 102 in the cold rolled uncoiler 112 proceeds to the continuous mill 114 via the welder 116 and the side looper 117.

At this time, the welding machine 116 is a rear end of the preceding hot rolled strip to the end of the trailing hot rolled strip provided by unwinding the subsequent hot rolled stainless coil supplied after the previous hot rolled stainless coil is completely unwound to perform cold rolling continuously. Weld on

The hot rolled strip is cold rolled while continuously passing through the continuous rolling mill 114, the cold rolled strip is produced in the cold rolling coiler 120 via the degreasing and cooling device 152 and the flaw detector 154. The cold rolled coil 104 is wound up.

The cold rolled coil 104 is conveyed to the integrated pickling annealing plant according to the present invention by a conveying means (not shown) or to the first coiler side of the continuous cold rolled plant. A cold rolled strip is provided by unwinding the cold rolled coil 104 transferred to the integrated pickling annealing unit 130 in the annealing pickling uncoiler 132. At this time, the trailing cold rolled coil may be operated to temporarily wait while the cold rolled coil is unwound from the annealing annealed uncoiler 132. For example, the trailing cold rolled coil may wait in a yard. The trailing end of the preceding cold rolled strip and the leading end of the trailing cold rolled strip are welded in the welder 137 so that annealing can be performed continuously.

The cold rolled strip passes through the annealing furnace 134 and the pickling facility 136 through the annealing pickling looper 138 after passing through the degreasing device 139 so that foreign substances existing on the surface can be removed. Annealed and pickled. The cold rolled strip passing through the pickling facility 136 is roughly rolled in the skin pass rolling mill 162 via the annealing outlet looper 161.

Thereafter, the pickled strip is surface corrected while passing through the degreasing device 164 and the flattening device 166. Then, the pickled strip passing through the defect detector 168 is wound by the cold rolled stainless coil 106 in the annealing pickling coiler 140.

Meanwhile, according to another embodiment of the present invention, the cold rolled coil 104 provided by winding the cold rolled strip in the cold rolling coiler 120 is supplied to the continuous cold rolling facility side before being fed to the integrated annealing plant side and cold rolled again. Can be. That is, the cold rolled coil 104 is unwound in the cold rolled uncoiler 112, and the cold rolled strip is cold rolled in a thin state while passing through the continuous rolling mill 114.

Subsequently, the cold rolled strip which has passed through the degreasing and cooling device 152 and the flaw detector 154 continuously is wound from the cold rolling coiler 120 to the cold rolled coil 104 and supplied to the integrated annealing plant. Through the route as described, the final product, ie cold rolled stainless steel coil 106, is manufactured.

The foregoing is merely illustrative of preferred embodiments of the present invention and those skilled in the art to which the present invention pertains may make modifications and changes to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. It must be recognized.

100: coil manufacturing apparatus
110: continuous cold rolling facility
112, 132: uncoiler
114: continuous rolling mill
116, 137: welding machine
117, 138, 161: looper
120, 140: coiler
130: integrated annealing plant
134: annealing furnace
136: Pickling equipment

Claims (7)

A continuous cold rolling facility including a first uncoiler installed at an inlet end to unwind a hot rolled stainless coil, and a continuous rolling machine for cold rolling the hot rolled strip discharged from the first uncoiler;
A first coiler winding the cold rolled strip discharged from the continuous mill with a cold rolled coil;
Conveying means for conveying the cold rolled coil;
An integrated annealing and pickling system comprising a second uncoiler for unwinding the cold rolled coil produced by the first coiler, an annealing furnace and a pickling facility for continuously annealing the cold rolled strip discharged from the second uncoiler; And
And a second coil provided on the exit side of the integrated annealing pickling plant to wind up the cold rolled strip passing through the pickling plant.
The conveying means transfers the cold rolled coil passed through the continuous mill from the first coiler to the second uncoiler to pass through the integrated annealing pickling plant, or transfers the cold rolled coil passed through the continuous mill to the continuous mill. Transfer the feeder from the first coiler to the first uncoiler of the continuous cold rolling facility so as to be rerolled.
And a degreasing and cooling system installed between the continuous mill and the first coiler to degrease and cool the cold rolled strip discharged from the continuous mill. The method of claim 1,
The cold rolled stainless steel coil manufacturing apparatus according to the semi-continuous method, characterized in that the following cold rolled coil is operated to temporarily wait while the preceding cold rolled coil is unwound in the second uncoiler. The method of claim 1,
The cold rolled strip unwound by the second uncoiler is a cold rolled stainless steel coil manufacturing apparatus according to the semi-continuous method, characterized in that for welding the connecting end of the preceding cold-rolled strip and the leading end of the following cold-rolled strip by a welder. The method of claim 1,
The cold rolled strip unwound by the first uncoiler is cold rolled stainless steel coil manufacturing apparatus according to the semi-continuous method, characterized in that the cold rolled after connecting the end of the preceding cold rolled strip and the end of the following cold rolled strip by welding in a welding machine. . delete The method according to claim 1 or 2,
And a defect detection apparatus installed in front of the first coil to detect surface defects of the cold rolled strip discharged from the continuous mill. The method according to claim 1 or 2,
And a degreasing facility installed between the second uncoiler and the annealing furnace to degrease the cold rolling strip entering the annealing furnace.

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