KR0136155B1 - Electricity roll used for electroplating process of steel plate - Google Patents
Electricity roll used for electroplating process of steel plateInfo
- Publication number
- KR0136155B1 KR0136155B1 KR1019940040291A KR19940040291A KR0136155B1 KR 0136155 B1 KR0136155 B1 KR 0136155B1 KR 1019940040291 A KR1019940040291 A KR 1019940040291A KR 19940040291 A KR19940040291 A KR 19940040291A KR 0136155 B1 KR0136155 B1 KR 0136155B1
- Authority
- KR
- South Korea
- Prior art keywords
- coating layer
- conductive ring
- roll
- ring
- polymer coating
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 238000009713 electroplating Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title description 3
- 230000005611 electricity Effects 0.000 title description 2
- 239000011247 coating layer Substances 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract 3
- 229920000642 polymer Polymers 0.000 claims description 38
- 238000007789 sealing Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
- C25D7/0657—Conducting rolls
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
- C25D17/12—Shape or form
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
연속전기도금에 사용되는 통전롤에 관한 것이다.The present invention relates to a rolling roll used for continuous electroplating.
본체 표면 중앙부에 환설된 전기전도링과 그 양단에서 본체 표면 양단부에 형성된 탄성 중합체 피복층의 경계부에서, 탄성중합체 피복층내에 전기전도링의 열팽창율과 비슷하거나 이보다 약간 작은 열팽창율을 갖는 금속링을 매설한 통전롤이 제공된다.In the boundary of the conductive ring annular to the center of the main body surface and the elastomeric coating layer formed at both ends of the main body surface, a metal ring having a thermal expansion rate similar to or slightly less than that of the conductive ring is embedded in the elastomeric coating layer. An energization roll is provided.
이 매설된 삽입링에 의해 전기전도링과 탄성중합체 피복층 경계부근의 급격한 열팽창차이를 완만하게 하여 단차를 줄이고 강판과 전기적인 접촉 및 실링을 양호하게 함으로써 제품 결함의 감소, 통전롤 본체의 부식 방지, 롤수명 연장 등 여러 효과를 가져온다.This buried insertion ring smoothes the rapid thermal expansion difference between the conductive ring and the elastomeric coating layer boundary, reducing the level difference, and making good electrical contact and sealing with the steel plate, thereby reducing product defects and preventing corrosion of the roll body. It has many effects such as extended roll life.
Description
제1도는 전기도금조의 개략구조도1 is a schematic structural diagram of an electroplating tank
제2도는 종래의 통전롤의 측단면도2 is a side cross-sectional view of a conventional energizing roll
제3도는 종래의 통전롤의 전기전도링과 중합체 피복층의 접합면을 나타내는 일부 단면도3 is a partial cross-sectional view showing a joining surface of an electrically conductive ring of a conventional conductive roll and a polymer coating layer.
제4도는 전기전도링과 중합체 피복층 사이에 중간링을 갖는 종래의 통전롤을 보여주는 일부 측단면도4 is a partial side cross-sectional view showing a conventional conducting roll having an intermediate ring between an electrically conductive ring and a polymer coating layer
제5도는 본 발명에 의한 통전롤에서 전기전도링과 중합체 피복층의 접합면을 나타내는 일부 단면도5 is a partial cross-sectional view showing the bonding surface of the conductive ring and the polymer coating layer in the current transfer roll according to the present invention
* 도면의 주요부위에 대한 부호의 설명* Explanation of symbols on the main parts of the drawings
1 : 통전롤2 : 전기전도링1: energizing roll 2: electric conduction ring
3 : 중합체 피복층1a : 롤본체3: polymer coating layer 1a: roll body
4 : 금속링5 : 강판4: metal ring 5: steel sheet
6 : 전해액7 : 중간링6: electrolyte solution 7: middle ring
본 발명은 강판의 연속전기도금공정에 사용되는 통전롤(conductor roll)에 관한 것이며, 보다 상세히는 통전롤의 전기전도링과 중합체 피복층이 이루는 경계면 부위의 열팽창 및 수축을 감소시킨 통전링에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive roll used in a continuous electroplating process of a steel sheet, and more particularly, to a conductive ring which reduces thermal expansion and contraction of an interface portion formed by an electrical conductive ring of a conductive roll and a polymer coating layer. .
강판의 전기도금 공정에 사용되는 통전롤은 전기도금에서 음극으로 작용하는데, 제1, 2도 및 3도에 도시된 바와같이, 일반적으로 강체(강철 또는 주철)로 된 원통형 본체(1a) 중심부에 스테인레스강으로된 전기전도링(2)가 환설되어 있으며, 그 전기전도링(2)의 양단은 유연한 중합체로된 피복층(3)이 형성되어 있다.The energizing roll used in the electroplating process of the steel sheet serves as a cathode in the electroplating, and as shown in FIGS. 1, 2 and 3, generally in the center of the cylindrical body 1a made of a rigid body (steel or cast iron) An electrically conductive ring 2 made of stainless steel is provided, and both ends of the electrically conductive ring 2 are formed with a coating layer 3 made of a flexible polymer.
상기 중합체 피복층(3)은 강판의 이동, 폭변동, 전기적 절연, 실링(sealing), 통전롤 본체의 부식방지등의 기능을 하며 탄성과 절연성이 요구된다.The polymer coating layer 3 functions to move the steel sheet, change the width, electrically insulate, seal, and prevent corrosion of the roll body and require elasticity and insulation.
이 통전롤(1)은 사용시 실내온도보다 높은 온도의 전해액(6)에 반쯤 잠겨지고, 강판(5)가 통전롤(1)이 잠긴부분을 둘러싸면서 전기전도링(2)와 전기적 접촉을 만들고, 탄성 절연체인 중합체 피복층(3)과 접촉하는 부위는 도금부착이 되지 않도록 실링을 한다.The conductive roll 1 is half immersed in the electrolyte 6 at a temperature higher than the room temperature in use, and the steel sheet 5 makes electrical contact with the conductive ring 2 while surrounding the locked portion of the conductive roll 1. And the site | part which contacts the polymer coating layer 3 which is an elastic insulator is sealed so that plating may not be carried out.
강판(5)가 전해액(6)을 통과하면서 도금층이 형성되고 이 도금층의 균일성은 강판(5)와 전기전도링(2) 사이의 전기접촉상태와 균일한 전기밀도 뿐만아니라, 강판(5)양단과 접촉하는 통전롤의 양단 중합체 피복층의 균일한 실링상태에 크게 좌우된다.The plated layer is formed while the steel plate 5 passes through the electrolyte solution 6, and the uniformity of the plated layer is not only in electrical contact state and uniform electrical density between the steel plate 5 and the conductive ring 2, but also at both ends of the steel plate 5. It is largely dependent on the uniform sealing state of the polymer coating layer of both ends of the current-carrying roll.
이같은 이유로 통상 통전롤의 본체(1a) 양단에 피복되는 중합체 피복층(3)은 탄성 접착성 및 실링을 부여하는 고무나 네오프렌, 폴리우레탄 및 이와 유사한 성질을 갖는 탄성중합체가 사용되고 있다.For this reason, rubber, neoprene, polyurethane, and elastomers having similar properties are generally used for the polymer coating layer 3 coated on both ends of the main body 1a of the energizing roll.
그러나 이같은 중합체는 금속재로 만들어진 전기전도링(2)와는 그 성질이 다르기 때문에 중합체 피복층(3)과 전기전도링(2)의 경계면은 열팽창율의 차이등으로 인하여 도금된 강판의 표면에 결함을 발생시키는 등 여러가지 문제점이 야기된다.However, since the polymer has a different property from the conductive ring 2 made of a metallic material, the interface between the polymer coating layer 3 and the conductive ring 2 causes defects on the surface of the plated steel sheet due to a difference in thermal expansion rate. Various problems are caused.
이를 보다 상세히 설명하면 다음과 같다.This will be described in more detail as follows.
통전롤(1)의 표면온도는 전류밀도, 양극 간격, 전해액 조성/온도, 냉각수 온도/ 유량, 강판 속도 등의 변화에 의하여 수시로 변하고 있다.The surface temperature of the current carrying roll 1 is frequently changed by changes in current density, anode gap, electrolyte composition / temperature, cooling water temperature / flow rate, steel sheet speed, and the like.
열팽창/ 수축은 중합체피복층(3)이 전기전도링(2) 보다 훨씬 크고, 온도변화에 대한 열전도도는 전기전도링(2)가 훨씬 크다. 온도변화에 전기전도링(2)가 매우 작게 변하는 것에 대해 중합체 피복층(3)은 상대적으로 큰 값으로 팽창 또는 수축함으로써 전기전도링(2)의 양단 경계면에 단차를 만들 뿐만아니라 중합체 피복층(3)과 전기 전도링(2)와의 접착성을 떨어지게 하며 이들 사이로 전해액을 스며들게 한다. 이때문에 경계면에서의 전기적인 접촉을 나쁘게 하여 상당한 부위에 전류분포를 불균질하게 할 뿐만아니라 무엇보다도 통전롤(1)의 몸체(1a)를 부식하게 만든다. 그래서 이러한 온도 변화는 통전롤(1) 표면에 지속적으로 가해지는 장력(견인력)에도 불구하고 경계면의 물리적인 팽창 또는 수축 즉 단차를 만든다.Thermal expansion / contraction is that the polymer coating layer (3) is much larger than the conductive ring (2), and the thermal conductivity against temperature change is much larger than the conductive ring (2). The polymer coating layer 3 expands or contracts to a relatively large value due to the change in temperature of the conductive ring 2 so small that it not only makes a step at the interface between both ends of the conductive ring 2, but also the polymer coating layer 3 And the adhesion between the electrical conduction ring (2) and soak the electrolyte between them. For this reason, the electrical contact at the interface is poor, thereby making the distribution of currents in a substantial portion not only uniform, but also causing the body 1a of the current roll 1 to corrode. Thus, such a temperature change creates a physical expansion or contraction, or step, at the interface despite the tension (towing force) continuously applied to the surface of the energizing roll 1.
또한 중합체 피복층(3)은 화학결합이나 흡착성이 강한 고온의 전해액(6) 속에 장기간에 걸쳐 잠겨져 서서히 열화됨으로 두께증가등 단차를 더욱 크게 하여 경계면에서의 전기적인 접촉과 실링을 더욱 나쁘게 한다.In addition, the polymer coating layer 3 is immersed in a high temperature electrolytic solution 6 having strong chemical bonding or adsorption for a long period of time, and gradually degrades, thereby increasing the step such as thickness increase, thereby making the electrical contact and sealing at the interface worse.
이렇게 접촉의 질과 균열성이 나빠지는 것은 특히 이러한 단차의 변화는 전기저항의 변화라는 관점에서 보면 강판(5)의 균질성과 설비의 효율에 즉각적인 영향을 가져오는 것이다.The deterioration of the contact quality and cracking property is such that the change of the step has an immediate effect on the homogeneity of the steel sheet 5 and the efficiency of the equipment, in view of the change in electrical resistance.
이러한 통전롤(1)의 단차와 실링상태를 개선시키기 위해 미국 특허 4,849,083 에서는 제4도에 도시된 바와같이 전기전도링(2)와 중합체 피복층(3) 사이에 열팽창 계수, 신축성등이 중간정도인 중간링(intermediate ring)(7)을 두고 있으나 이 구조는 많은 문제를 야기시킬 수 있는 경계면을 또 하나 만드는 결과를 초래한다.In order to improve the step and sealing state of the current roll 1, US Pat. No. 4,849,083 has a moderate coefficient of thermal expansion, elasticity, etc. between the electrically conductive ring 2 and the polymer coating layer 3, as shown in FIG. It has an intermediate ring (7) but this structure results in the creation of another interface that can cause many problems.
이에 본 발명의 목적을 상기와 같은 종래의 통전롤의 문제점을 해결한 보다 개선된 구조의 통전롤을 제공하는 데 있다.It is an object of the present invention to provide a current-carrying roll of a more improved structure that solves the problems of the conventional current-carrying roll as described above.
본 발명의 다른 목적은 통전롤의 전기전도링과 중합체 피복층의 성질차이에서 비롯된 경계면의 단차 변화를 감소시켜 전기접촉과 전기절연 실링을 양호하게 하여 제품의 결함발생을 줄일 수 있는 보다 개선된 구조의 통전롤을 제공하는 데 있다.It is another object of the present invention to improve the electrical contact and electrical insulation sealing by reducing the step change of the interface resulting from the difference in the properties of the conductive rolls and the polymer coating layer of the current transfer roll, thereby improving the structure of the product. It is to provide a roll of electricity.
나아가 본 발명의 또다른 목적은 강판의 도금성을 증진시키고 설비의 에너지 효율향상 및 설비의 휴지주기와 유지보수비를 감소시킬 수 있는 통전롤을 제공하는 데 있다.Furthermore, another object of the present invention is to provide an energizing roll that can improve the plating property of the steel sheet and improve the energy efficiency of the equipment and reduce the downtime and maintenance costs of the equipment.
본 발명에 의하면, 강체로된 원통형 본체, 상기 본체의 표면 중앙부에 환설되어 강판과 전기접촉을 하는 전기전도링 및 상기 전기전도링의 양단에서 본체표면 양단부를 피복하여 강판과 절연 및 실링을 하는 탄성중합체 피복층으로 이루어진 연속도금 강판의 통전롤에 있어서, 상기 탄성 중합체 피복층과 전기전도링과의 경계부근의 중합체 피복층내에 전기전도링의 열팽창율과 비슷하거나 약간 작은 열팽창률을 갖는 금속링을 매설시킨 것을 특징으로 하는 통전롤이 제공된다.According to the present invention, a cylindrical body made of a rigid body, an electrically conductive ring which is provided at the center of the surface of the main body and makes electrical contact with the steel plate, and an elastic body that insulates and seals the steel plate by covering both ends of the body surface at both ends of the electrically conductive ring. In the current-carrying roll of a continuous plated steel sheet composed of a polymer coating layer, embedding a metal ring having a thermal expansion rate similar to or slightly smaller than that of the conductive ring in the polymer coating layer near the boundary between the elastomeric coating layer and the conductive ring. An energizing roll is provided.
본 발명에서는 통전롤에서 전기전도링과 중합체 피복층의 경계면부근의 중합체 피복층내에 전기전도링의 열팽창율과 열팽창율이 같거나 이보다 약간 작은 금속링을 매설함으로써 경계면에서의 온도변화에 의한 단차변동을 크게 감소시키고 실링을 양호하게 한다. 상기 금속링은 그 단면이 삼각형 또는 사각형 모양으로 형성하는 것이 바람직하며, 이 금속링은 중합체 피복층과 전기전도링이 접합되는 부위에서 중합체 피복층내에 매설된다.In the present invention, the step difference caused by the temperature change at the interface is greatly increased by embedding a metal ring having the same or slightly smaller thermal expansion coefficient and thermal expansion coefficient of the conductive ring in the polymer coating layer near the interface between the conductive ring and the polymer coating layer. Reduction and good sealing. The metal ring is preferably formed in a triangular or square shape in cross section, and the metal ring is embedded in the polymer coating layer at the portion where the polymer coating layer and the conductive ring are joined.
이때 중합체 피복층이 전기전도링에 덮히는 경사면은 경계면측에서 중합체 피복층이 금속링과 이루는 경사면보다 약간 작게 형성함으로써 금속링과 전기전도링 사이에서 중합체 피복층이 통전롤의 본체표면과 접촉하는 면적을 넓게 하는 것이 좋다.At this time, the inclined surface covered by the polymer coating layer on the conductive ring is formed to be slightly smaller than the inclined surface formed by the polymer coating layer on the metal ring at the interface side, so that the area where the polymer coating layer contacts the main surface of the conductive roll between the metal ring and the conductive ring. Good to do.
반면 경계면측과 반대되는 쪽의 금속링과 중합체 피복층이 이루는 경사면은 완만하게 형성시키는 것이 바람직하다. 또한 상기 금속링은 그 저면을 통전롤의 본체와 밀착시킴으로써 본체의 냉각효과를 전달받게 하는 것이 바람직하다.On the other hand, it is preferable that the inclined surface formed by the metal ring and the polymer coating layer on the side opposite to the boundary surface is formed smoothly. In addition, it is preferable that the metal ring receives the cooling effect of the main body by bringing the bottom surface into close contact with the main body of the energizing roll.
이하, 본 발명을 첨부도면에 따라 설명한다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
제5도는 본 발명에 의한 통전롤의 전기전도링과 중합체 피복층의 접합면을 단면도로 나타낸 것이다.5 is a cross-sectional view showing the bonding surface of the electrically conductive ring of the current-carrying roll and the polymer coating layer according to the present invention.
도시된 바와같이 중합체 피복층(3)과 전기전도링(2)의 경계면 부근에서 열팽창율이 전기전도링(2)와 같거나 이보다 약간 작은 삼각형(또는 사다리꼴) 형태의 금속링(4)가 중합체 피복층(3)내에 매설되어 있다.As shown, the metal ring 4 in the form of a triangular (or trapezoidal) shape having a coefficient of thermal expansion equal to or slightly smaller than the conductive ring 2 near the interface between the polymeric coating layer 3 and the conductive ring 2 is formed of the polymeric coating layer. It is buried in (3).
이같이 설치된 금속링(4)에 의해 경계부근의 중합체 피복층(3)의 열팽창/수축을 1/4-1/5로 줄이고, 또한 금속링(4)의 밑면이 냉각수에 의해 냉각되고 있는 롤본체(1a)와 접촉하여 냉각되고 있으므로 금속링(4) 부근의 중합체 피복층(3)의 온도를 낮은 온도로 유지케해서 전체적으로 경계부근의 중합체 피복층(3)의 온도변화에 의한 열팽창/수축을 줄이고 완만하게 한다.The roll body in which the thermal expansion / contraction of the polymer coating layer 3 near the boundary is reduced to 1 / 4-1 / 5 by the metal ring 4 provided in this manner, and the bottom surface of the metal ring 4 is cooled by cooling water. Since it is cooled in contact with 1a), it is possible to keep the temperature of the polymer coating layer 3 near the metal ring 4 at a low temperature, thereby reducing the thermal expansion / shrinkage caused by the temperature change of the polymer coating layer 3 near the boundary as a whole. do.
그리고 전기전도링(2)와 금속링(4) 사이는 어느정도 간격으로 떨어져 있는 것이 바람직하다. 전기전도링(2)와 금속링(4)의 간격이 너무 벌어지면 금속링(4)의 매설효과가 미흡하게 될 수 있고 간격이 너무 좁게 되면 금속링(4)의 삽입 작업이 곤란할 수 있다. 예를들면, 피복층(3)의 두께가 약 2㎝ 정도인 경우 전기전도링(2)와 금속링(4) 사이의 간격은 약 0.5-0.7㎝ 정도이면 충분하다. 또한, 금속링(4)의 경사면의 경사각 θ2가 전기전도링(2)의 경사각 θ1보다 크면 이 사이에 끼인 중합체 피복층(3a)의 저면이 롤본체(1a)의 표면과 접촉하는 면적이 넓게 되어 중합체 피복층(3)과 전기전도링(2)의 접착과 실링을 좋게 한다.In addition, it is preferable that the conductive ring 2 and the metal ring 4 are spaced apart to some extent. If the gap between the conductive ring 2 and the metal ring 4 is too wide, the embedding effect of the metal ring 4 may be insufficient, and when the gap is too narrow, the insertion of the metal ring 4 may be difficult. For example, when the thickness of the coating layer 3 is about 2 cm, the distance between the electrically conductive ring 2 and the metal ring 4 is about 0.5-0.7 cm is sufficient. When the inclination angle θ 2 of the inclined surface of the metal ring 4 is greater than the inclination angle θ 1 of the conductive ring 2, the area where the bottom surface of the polymer coating layer 3a sandwiched therebetween is in contact with the surface of the roll body 1a It becomes wider, and the adhesion and sealing of the polymer coating layer 3 and the electrically conductive ring 2 are made good.
이상에서 설명한 바와 같이, 본 발명에 의하면 열팽창율이 상대적으로 크게 다른 두가지 물질이 맞닫는 부분에 열팽창율이 큰 삼각형(또는 사다리꼴)의 물질을 설치(일정한 거리를 두고) 하므로써 경계부근의 급격한 열팽창 차이를 완만하게 하여 단차를 줄여서 강판과 전기적인 접촉과 실링등을 좋게하므로 부적절한 단차에 기인하는 각종 제품결함 예를 들면 밴드 마크(band mark) 아-크 스폿(arc spot) 등이 대폭 감소되어 설비의 에너지 효율, 생산성이 향상되고, 전해액이 스며드는 것을 막아 몸체의 부식등을 방지하여 롤의 수명을 연장하고 설비휴지주기와 유지보수비를 감소시키는 효과를 가져오는 것이다.As described above, according to the present invention, a sudden thermal expansion difference near the boundary is provided by installing (at a certain distance) a triangular (or trapezoidal) material having a large thermal expansion rate at a portion where two materials having relatively large thermal expansion coefficients are in contact with each other. By smoothing the step, the step is reduced to improve electrical contact and sealing with the steel plate, and various product defects caused by inadequate step, such as band mark arc spot, are greatly reduced. It improves energy efficiency, productivity, and prevents electrolyte from penetrating, thus preventing corrosion of the body, thus extending the life of rolls and reducing facility downtime and maintenance costs.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940040291A KR0136155B1 (en) | 1994-12-31 | 1994-12-31 | Electricity roll used for electroplating process of steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940040291A KR0136155B1 (en) | 1994-12-31 | 1994-12-31 | Electricity roll used for electroplating process of steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960023263A KR960023263A (en) | 1996-07-18 |
| KR0136155B1 true KR0136155B1 (en) | 1998-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019940040291A KR0136155B1 (en) | 1994-12-31 | 1994-12-31 | Electricity roll used for electroplating process of steel plate |
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| Country | Link |
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| KR (1) | KR0136155B1 (en) |
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|---|---|---|---|---|
| KR100231268B1 (en) * | 1997-06-23 | 1999-11-15 | 류정열 | Air intake devices of engines for automobiles |
| KR100758438B1 (en) * | 2001-05-10 | 2007-09-14 | 주식회사 포스코 | Step removal device using rubber tube |
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1994
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