KR101205151B1 - Apparatus for slitting steel using local rapid cooling and method for slitting soft steel using the same - Google Patents
Apparatus for slitting steel using local rapid cooling and method for slitting soft steel using the same Download PDFInfo
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- KR101205151B1 KR101205151B1 KR20100084110A KR20100084110A KR101205151B1 KR 101205151 B1 KR101205151 B1 KR 101205151B1 KR 20100084110 A KR20100084110 A KR 20100084110A KR 20100084110 A KR20100084110 A KR 20100084110A KR 101205151 B1 KR101205151 B1 KR 101205151B1
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- steel sheet
- slitting
- temperature
- cooling
- scissor
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Abstract
The present invention relates to a slitting apparatus of a steel sheet and a method of slitting a steel sheet using the same, and immediately before cutting by a scissor, the portion to be cut of the steel sheet is subjected to a DBTT (Ductile Brittle Transition Temperature) temperature The present invention relates to an apparatus and a method for preventing burrs from occurring at edges of a steel sheet by performing brittle fracture in the steel sheet during slitting by performing local rapid cooling in advance.
Description
The present invention relates to a slitting apparatus for a steel sheet including a local rapid cooling apparatus and a slitting method of the steel sheet using the same. More specifically, the steel sheet is brought to a temperature below DBTT (Ductile Brittle Transition Temperature) just before slitting is performed. The present invention relates to a technique of performing rapid cooling so that no defect occurs when the steel sheet is slit.
As one of the steel sheet manufacturing methods for forming automotive parts, a method of cutting a steel sheet in the longitudinal direction to produce a plurality of ribbon steel sheets is used.
To this end, generally, a wide strip rolled with a strip mill is first slitted and shipped in a coil form.
Next, a method of manufacturing a finished product by secondary slitting again according to the size of the automotive part is used in the manufacturing process of the automotive part as described above.
An object of the present invention is to immediately cool the steel sheet below the DBTT temperature immediately before the steel sheet is slitted, so that brittle fracture occurs when the steel sheet is slitted, thereby cutting the edge of the slitted steel sheet. It is to provide a slitting method of the steel sheet to prevent the occurrence of (burr).
In addition, another object of the present invention is to provide a slitting apparatus for steel sheets equipped with a local rapid cooling apparatus in a region adjacent to the scissor in order to realize the above-described method.
Slitting apparatus of the steel sheet according to an embodiment of the present invention is a roller table for transferring the uncoiled steel sheet, and disposed at the end of the roller table, the continuous slit along the longitudinal direction of the steel sheet It is characterized in that it comprises a plurality of scissor for performing the casting and the plurality of cooling unit that is disposed adjacent to the scissor, the cooling key locally only the region where the slitting is to be made just before the steel sheet touches the scissor.
Here, the scissor is characterized in that it comprises a disk-shaped blade, the cooling unit is characterized in that it includes a number corresponding to 1: 1 with the scissor.
Next, the cooling unit is characterized in that the line width of the portion corresponding to the end of the steel sheet is 10 ~ 30mm, the length of the portion corresponding to the longitudinal direction of the steel sheet is 30 ~ 150mm.
Next, the cooling unit is characterized in that it comprises a quench nozzle for injecting a liquefied gas to the steel sheet passed through the lower portion, characterized in that the cooling unit is connected to a temperature control unit for controlling the quench temperature below the DBTT temperature.
At this time, the temperature control unit is disposed under the scissor, characterized in that it further comprises a thermometer (Thermometer) for monitoring the temperature of the steel sheet on which the slitting is performed.
In addition, the slitting method of the steel sheet according to an embodiment of the present invention includes the step of transferring the uncoiled steel sheet and during the transfer, the step of performing a continuous cutting process along the longitudinal direction of the steel sheet However, immediately before performing the cutting process, the cutting portion after the local rapid cooling of the portion to be cut is characterized in that to perform the cutting process.
In this case, the rapid cooling is characterized in that the cooling medium is sprayed through a nozzle.
In this case, the cooling medium is characterized in that the liquefied gas containing at least one of oxygen (O 2 ), hydrogen (H 2 ), nitrogen (N 2 ) and argon (Ar).
Next, the rapid cooling is characterized in that it is carried out until the temperature of the portion to be cut of the steel sheet is below the DBTT (Ductile Brittle Transition Temperature) temperature.
In this case, the rapid cooling temperature is controlled by monitoring the steel plate temperature after the cutting process is performed.
By using the slitting apparatus and method according to the present invention, it is possible to solve a problem in which burrs are generated at steel sheet edges without limitations such as soft steel sheets or thick steel sheets.
In particular, when the steel sheet manufactured using the slitting apparatus according to the present invention is molded into an automotive part, cracks may be propagated and the quality of the parts may not be deteriorated.
In addition, when slitting a high strength steel sheet as a basic method, the blade portion of the scissor may be easily blunted. When the slitting method according to the present invention is used, brittle fracture is easily progressed using local rapid cooling. As a result, it is possible to extend the life of the scissor and to significantly lower the probability of burrs.
Thus, by using the steel sheet slitting method according to the present invention, by reducing the rate of defective parts, it provides an effect that can reduce the cost of waste by reducing the waste of manpower and material waste caused by the molding of the defective parts.
1 is a schematic view showing a steel sheet slitting apparatus as a comparative example according to the present invention.
2 is a side view showing a problem of a comparative example according to the present invention.
3 is a schematic view showing a slitting apparatus of a steel sheet including a local rapid cooling apparatus according to an embodiment of the present invention.
4 is a schematic view showing a slitting apparatus of a steel sheet including a local rapid cooling apparatus according to another embodiment of the present invention.
Figure 5 is a schematic diagram showing a slitting apparatus for a steel sheet according to another embodiment of the present invention and a method for slitting the steel sheet using the same.
Hereinafter, with reference to the accompanying drawings it will be described in detail with respect to the slitting apparatus of the steel sheet including a local rapid cooling apparatus according to a preferred embodiment of the present invention and a slitting method of the steel sheet using the same.
Advantages and features of the present invention, and methods of achieving the same will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
Currently, steel sheets for slitting for forming automotive parts are mainly used for soft steel sheets. Such a soft steel sheet is excellent in formability for manufacturing automotive parts, but burrs are generated during slitting and cracks are propagated at edges during actual molding of parts.
Therefore, to prevent burr generation, the blade of the scissor for cutting the steel sheet must always be kept in the best state.
On the other hand, in recent years, the use of a softer steel sheet than the current is required as a higher formability than the existing.
Thus, the probability of burr is increasing. In addition, when the thickness of the steel sheet is thick, the frequency of occurrence of burr is further increased.
In order to manage such burrs, first, the scissor must be kept sharp at all times when slitting the coil in the coil center. However, as the high-strength high-strength steel sheet is developed, the scouring edge of the scissor blade becomes faster.
Therefore, a lot of time and money are spent on maintaining the day of Caesar.
1 is a schematic view showing a steel sheet slitting apparatus as a comparative example according to the present invention.
Referring to FIG. 1, after the
Next, after arranging the
At this time, when the blade state of the
Here, the burr may be generated in the cut and the friction portion made by the
2 is a side view showing a problem of a comparative example according to the present invention.
Referring to FIG. 2, it can be seen that
Therefore, when burrs are generated, all edge portions of the steel sheet are ground to solve the problem of defects. In this case, time and cost are unnecessarily increased, and manpower may be wasted.
Accordingly, in the present invention, a phenomenon in which the shape of the fracture is changed from a ductile fracture state to a brittle fracture state in a low temperature state is used.
To this end, a local cooling unit is further mounted on the front of the scissor during slitting of the steel sheet, and the liquefied gas is locally sprayed onto the steel sheet, thereby lowering the temperature of the steel sheet below the DBTT temperature.
Therefore, when the scissor touches the steel sheet, the brittle fracture may proceed so that burrs are not generated after slitting. This can contribute not only to improving the quality of the parts but also to increasing the usefulness of the procedure management, thereby improving the overall characteristics of the slitting process.
3 is a schematic view showing a slitting apparatus of a steel sheet including a local rapid cooling apparatus according to an embodiment of the present invention.
Referring to FIG. 3, the
At this time, the drive unit for uncoiling, the roller table unit for moving the steel sheet and other devices for driving the scissor are all to follow the general installation. Therefore, in the present invention, since no special indication or explanation is given, the present invention is not limited to the fact that they are not shown.
Next, a
In this case, the
Here, the cooling medium is preferably a liquefied gas containing at least one of oxygen (O 2 ), hydrogen (H 2 ), nitrogen (N 2 ) and argon (Ar), in particular, considering the economical efficiency Most preferred.
The cooling unit of the present invention provided as described above performs local rapid cooling until the temperature of the steel sheet is below the DBTT (Ductile Brittle Transition Temperature) temperature. In this case, when the temperature of the steel sheet exceeds the DBTT temperature, ductile fracture is performed in the
Therefore, it is preferable to rapidly lower the temperature below the DBTT temperature according to the moving speed of the steel sheet. For this purpose, the size of the cooling unit according to the present invention has a line width of 10 to 30 mm corresponding to the end portion of the steel sheet, and corresponds to the longitudinal direction of the steel sheet. It is preferable that the length of the part to become is 30-150 mm.
Here, the
In this case, when the size of the cooling unit is installed below the minimum range, the cooling time is not sufficiently secured, and the injection amount of the cooling medium is also reduced, so that rapid cooling may not be performed below the DBTT temperature according to the speed at which the steel sheet proceeds.
On the contrary, when the maximum cooling unit size is exceeded, the liquefied gas injection cost is increased, and the front cooling can be performed unnecessarily instead of local cooling, so that the efficiency of local rapid cooling can be reduced.
Therefore, the cooling unit according to the present invention complies with the given size range, but can finally perform local rapid cooling through cooling medium injection.
In this case, a thermometer for measuring the cooling temperature and a control unit for controlling whether or not to perform further cooling by analyzing the monitoring value of the thermometer may be further included. It is shown in Figure 5 below.
Figure 5 is a schematic diagram showing a slitting apparatus for a steel sheet according to another embodiment of the present invention and a method for slitting the steel sheet using the same.
Referring to FIG. 5, as a slitting method of a steel sheet according to an embodiment of the present invention, the
In this case, rapid cooling should be performed until the temperature of the
As described above, the use of the slitting apparatus and method according to the present invention can solve a problem in which burrs are generated at the edge portions of the slitted steel sheet without limitation such as soft steel sheets or thick steel sheets.
If the burr does not occur, there may be no problem that cracks propagate and deteriorate the quality of the part. Therefore, if the slitting apparatus according to the present invention is used, not only the slitting process for molding automobile parts but also various molding processes having the risk of other cracks can be utilized.
In addition, using the slitting method according to the present invention can extend the life of the scissor, thereby reducing the cost and time for equipment maintenance.
Therefore, by using the steel sheet slitting method according to the present invention, it is possible to significantly reduce the rate of defective parts, and to reduce the waste of manpower and material waste, because the separate molding process that has been previously performed to correct the defective parts can be omitted. Cost reduction can be induced.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Such changes and modifications are intended to fall within the scope of the present invention unless they depart from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.
10, 100, 200, 300: steel coil
20, 120, 220, 320: uncoiled steel sheet
30, 130, 230, 330: Caesar
40: slitted steel sheet
50: Burr
140, 240, 340: local cooling zone
150, 250, 350: cooling section
360: temperature control unit
370: Thermometer
Claims (13)
The cooling unit slitting apparatus of the steel sheet, characterized in that connected to the temperature control unit for controlling the quench temperature below the DBTT temperature.
The scissor is a slitting device of the steel sheet, characterized in that it comprises a disk-shaped blade.
Slitting apparatus of the steel sheet, characterized in that the cooling unit is included in the number corresponding to 1: 1 with the scissor.
The cooling unit
Slitting apparatus of the steel sheet, characterized in that the line width of the portion corresponding to the end of the steel sheet is 10 ~ 30mm.
The cooling unit
Slitting device of the steel sheet, characterized in that the length of the portion corresponding to the longitudinal direction of the steel sheet is 30 ~ 150mm.
The cooling unit
And a quenching nozzle for injecting liquefied gas into the steel sheet passed through the lower portion.
The temperature control unit
The apparatus of claim 1, further comprising a thermometer disposed under the scissor for monitoring the temperature of the steel sheet on which the slitting is performed.
The rapid cooling is carried out until the temperature of the cut portion of the steel sheet is below the DBTT (Ductile Brittle Transition Temperature) temperature.
The rapid cooling is
Slitting method of the steel sheet, characterized in that performed by spraying the cooling medium through the nozzle.
The cooling medium is
It is a liquefied gas containing at least one of oxygen (O 2 ), hydrogen (H 2 ), nitrogen (N 2 ) and argon (Ar).
And monitoring the steel sheet temperature after the cutting process is performed to control the rapid cooling temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20100084110A KR101205151B1 (en) | 2010-08-30 | 2010-08-30 | Apparatus for slitting steel using local rapid cooling and method for slitting soft steel using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20100084110A KR101205151B1 (en) | 2010-08-30 | 2010-08-30 | Apparatus for slitting steel using local rapid cooling and method for slitting soft steel using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20120020476A KR20120020476A (en) | 2012-03-08 |
| KR101205151B1 true KR101205151B1 (en) | 2012-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR20100084110A KR101205151B1 (en) | 2010-08-30 | 2010-08-30 | Apparatus for slitting steel using local rapid cooling and method for slitting soft steel using the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210007673A (en) | 2019-07-12 | 2021-01-20 | 주식회사 엘지화학 | Cutting device for lithium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102382821B1 (en) | 2020-03-17 | 2022-04-05 | 아주철강산업주식회사 | Steel plate slitting and cutting machine |
| KR102309248B1 (en) | 2020-03-17 | 2021-10-07 | 아주철강산업주식회사 | Side guide for steel plate slitting and cutting machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62136307A (en) | 1985-12-07 | 1987-06-19 | Nippon Kokan Kk <Nkk> | Slit device in steel strip rolling fine |
| JPH10235515A (en) | 1997-02-24 | 1998-09-08 | Nkk Corp | Warm slitting method and equipment for high silicon band steel |
| KR100758575B1 (en) * | 2005-10-14 | 2007-09-14 | 에어 프로덕츠 앤드 케미칼스, 인코오포레이티드 | Cryofluid assisted forming method |
-
2010
- 2010-08-30 KR KR20100084110A patent/KR101205151B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62136307A (en) | 1985-12-07 | 1987-06-19 | Nippon Kokan Kk <Nkk> | Slit device in steel strip rolling fine |
| JPH10235515A (en) | 1997-02-24 | 1998-09-08 | Nkk Corp | Warm slitting method and equipment for high silicon band steel |
| KR100758575B1 (en) * | 2005-10-14 | 2007-09-14 | 에어 프로덕츠 앤드 케미칼스, 인코오포레이티드 | Cryofluid assisted forming method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210007673A (en) | 2019-07-12 | 2021-01-20 | 주식회사 엘지화학 | Cutting device for lithium |
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| Publication number | Publication date |
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| KR20120020476A (en) | 2012-03-08 |
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