KR100914473B1 - Coating method for coating insulation film of non-oriented electrical steel sheet - Google Patents

Coating method for coating insulation film of non-oriented electrical steel sheet Download PDF

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KR100914473B1
KR100914473B1 KR1020080117095A KR20080117095A KR100914473B1 KR 100914473 B1 KR100914473 B1 KR 100914473B1 KR 1020080117095 A KR1020080117095 A KR 1020080117095A KR 20080117095 A KR20080117095 A KR 20080117095A KR 100914473 B1 KR100914473 B1 KR 100914473B1
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coating
roll
rolls
fixed
electrical steel
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KR20090004814A (en
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박순복
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
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Abstract

본 발명은 무방향성 전기강판의 절연피막 코팅방법에 관한 것으로, 쿨링존과 건조로 사이에 세워 고정된 고정포스트와, 바닥면에 경사고정되고 고정포스트에 연결된 하부 리프트와, 고정포스트의 상단부에 연결되고 하부 리프트와 동일한 경사를 갖도록 고정된 상부 리프트와, 상부 및 하부 리프트에 각각 고정되고 서로 갭을 가지며 그 사이로 스트립이 통과되는 상부 및 하부 코팅롤과, 이들 사이로 인입되는 스트립의 상,하면에 절연코팅액을 도포하도록 배관된 노즐로 구성된 2롤 타입 코팅장치를 이용하여 냉간압연 후 탈탄, 소둔되어 인입되는 무방향성 전기강판용 스트립의 표면에 절연코팅할 때 절연코팅액을 0.08∼0.20mils로 코팅하기 위해, 절연 코팅액은 비중 1.18∼1.24, 점도 12∼12.9cps의 무기질 절연 코팅액을 사용하며, 코팅에 사용하는 상,하부 코팅롤은 직경: 300∼350㎜, 주속비: 90∼100%, 압하량: 110~140kg로 설정하고, 스트립 인입각: 4~6°, 수직에 대한 상,하부 코팅롤과의 경사각: 5~11°, 롤간 편심: 2~8㎜로 설정하여 코팅하는 것을 특징으로 하는 무방향성 전기강판의 절연피막 코팅방법을 제공한다.The present invention relates to a method for coating an insulating coating of non-oriented electrical steel sheet, fixed post fixed between the cooling zone and the drying furnace, a lower lift inclined to the bottom surface connected to the fixed post, and connected to the upper end of the fixed post Upper and lower coating rolls fixed to the upper and lower lifts, fixed to have the same inclination as the lower lift, the upper and lower coating rolls fixed to the upper and lower lifts, and having a gap therebetween, and the strips inserted between them, respectively. In order to coat the insulation coating liquid with 0.08 to 0.20 mils when the insulation coating is applied to the surface of the strip for non-oriented electrical steel sheet which is decarburized, annealed and drawn after cold rolling using a two-roll coating apparatus composed of nozzles piped to apply the coating liquid, Insulation coating liquid uses inorganic insulating coating liquid with specific gravity 1.18 ~ 1.24, viscosity 12 ~ 12.9cps. The coating roll is set to a diameter of 300 to 350 mm, a circumferential ratio of 90 to 100%, a rolling reduction of 110 to 140 kg, and a strip entry angle of 4 to 6 ° and an inclination angle of the upper and lower coating rolls to the vertical: 5 11 °, roll-to-roll eccentricity: Provides an insulating film coating method of non-oriented electrical steel sheet, characterized in that the coating is set to 2 ~ 8mm.

이에 따라, 본 발명은 300∼350mpm 정도의 라인속도에서도 코팅롤의 훼손이 적으며 코팅 표면이 미려한 절연코팅 품질 확보와 코팅롤 표면부 훼손을 최소화시켜 코팅롤 조기 교체에 따른 생산장애 시간을 줄일 수 있는 효과와 코팅 작업성이 향상되는 효과를 제공한다.Accordingly, the present invention is less damage of the coating roll at the line speed of about 300 ~ 350mpm and minimizes the damage of the coating roll surface portion and minimize the damage of the coating roll surface to reduce the production failure time due to the early replacement of the coating roll Effect and to improve the coating workability.

무방향성, 전기강판, 절연피막, 후막, 롤 Non-oriented, electrical steel sheet, insulation film, thick film, roll

Description

무방향성 전기강판의 절연피막 코팅방법{COATING METHOD FOR COATING INSULATION FILM OF NON-ORIENTED ELECTRICAL STEEL SHEET}COATING METHOD FOR COATING INSULATION FILM OF NON-ORIENTED ELECTRICAL STEEL SHEET}

본 발명은 무방향성 전기강판의 절연피막 코팅방법에 관한 것으로, 보다 상세하게는 코팅롤의 훼손이 적으면서도 코팅품질이 우수한 절연코팅이 가능하도록 한 개선된 무방향성 전기강판의 절연피막 코팅방법에 관한 것이다.The present invention relates to a method for coating insulating films of non-oriented electrical steel sheet, and more particularly, to an improved coating method for insulating films of non-oriented electrical steel sheet, which enables an excellent coating quality with little damage to the coating roll. will be.

일반적으로, 각종 모터, 발전기, 안전기 등과 같은 전기기기용 철심으로 사용되는 무방향성 전기강판은, 와전류 발생에 따른 전력손실을 최소화하기 위하여 그 표면에 절연피막이 코팅된다.In general, the non-oriented electrical steel sheet used as iron cores for electric devices such as various motors, generators, safety devices, etc., is coated with an insulating coating on the surface of the sheet to minimize the power loss caused by eddy currents.

도 1 및 도 2에는 전기강판에 절연피막을 코팅하기 위한 종래 3롤 타입 코팅장치(1)가 도시되어 있는바, 도시된 바와 같이, 3롤 타입 코팅장치(1)는 각각 3개의 롤로 구성되며, 서로 대칭적인 구조를 갖는 상부롤(10) 및 하부롤(20)을 구비한다.1 and 2 shows a conventional three roll type coating apparatus 1 for coating an insulating film on an electrical steel bar, as shown, the three roll type coating apparatus 1 is composed of three rolls, respectively. , The upper roll 10 and the lower roll 20 having a symmetrical structure with each other.

상기 상부롤(10)과 하부롤(20)은 코팅장치(1)의 스탠드(2)에 설치되며, 하부롤(20)은 아암(3)의 작동에 의해 승강될 수 있다.The upper roll 10 and the lower roll 20 are installed on the stand 2 of the coating apparatus 1, the lower roll 20 can be elevated by the operation of the arm (3).

또한, 도 2에서와 같이, 상부롤(10)은 레저버(14)에 저장된 코팅액(4)을 직 접 픽업하는 상부픽업롤(11), 상부픽업롤(11)으로부터 픽업된 코팅액(4)을 공급받아 전기강판용 스트립(s)에 코팅하는 상부코팅롤(13), 상부픽업롤(11)과 상부코팅롤(13)의 사이에 배치되며 상부픽업롤(11)로부터 상부코팅롤(13)로 전달되는 코팅액(4)의 양이 조절되도록 하는 상부전달롤(12)로 구성된다. 통상적으로 각 롤은 원통형태로 만들어지며, 상부픽업롤(11)과 상부코팅롤(13)은 고무재질로 만들어지며, 상부전달롤(12)은 스틸재질로 만들어진다.In addition, as shown in Figure 2, the upper roll 10 is the upper pick-up roll 11, which picks up the coating liquid 4 stored in the reservoir 14, the coating liquid 4 picked up from the upper pick-up roll 11 The upper coating roll 13, the upper pick-up roll 11 and the upper coating roll 13 to be coated on the strip (s) for electrical steel supplied to the upper coating roll 13 from the upper pick-up roll (11) Consisting of the upper transfer roll 12 to control the amount of the coating liquid 4 is delivered to. Typically, each roll is made of a cylindrical shape, the upper pick-up roll 11 and the upper coating roll 13 is made of a rubber material, the upper transfer roll 12 is made of a steel material.

하부롤(20)은 상부롤(10)과 대칭구조를 가지므로, 하부롤에 대하여는 굳이 설명하지 않는다. 다만, 하부코팅롤(23)은 상부롤(10)의 하중에 따른 부하를 저감시키기 위하여 상부코팅롤(13)에 대하여 편심 배치되어 있다. 통상적으로 편심거리(d)는 2∼5㎜로 설정된다.Since the lower roll 20 has a symmetrical structure with the upper roll 10, the lower roll is not necessarily explained. However, the lower coating roll 23 is disposed eccentrically with respect to the upper coating roll 13 in order to reduce the load according to the load of the upper roll 10. Usually, the eccentric distance d is set to 2-5 mm.

한편, 스트립(s)은 지지롤(30)에 의해 지지되어 상,하부롤(10,20)의 사이로 인입되는데, 이때 스트립(s)이 지지롤(30)과 일정한 각도를 이루며 인입되는 각도를 스트립의 인입각(θ)이라 한다.On the other hand, the strip (s) is supported by the support roll 30 and drawn between the upper and lower rolls (10, 20), wherein the strip (s) at a predetermined angle with the support roll 30 at an angle It is called the inlet angle θ of the strip.

도 2를 참조하여 이러한 코팅장치를 이용한 종래의 전기강판 절연피막 코팅방법에 대하여 살펴본다.With reference to Figure 2 looks at the conventional electrical steel sheet insulation coating method using such a coating device.

아래의 표 1은, 200∼250mpm(mpm: 스트립의 분당 이동거리)의 통상적인 라인속도에 대응하는 각 롤의 공정조건을 나타낸 것이다. 여기서 주속비는 스트립(s)의 진행속도에 해당하는 라인속도에 대한 롤속도의 비(롤속도/라인속도)를 퍼센트(%)로 나타낸 것을 말한다.Table 1 below shows the process conditions for each roll corresponding to a typical line speed of 200 to 250 mpm (mpm: travel per minute of the strip). Here, the circumferential speed ratio refers to a ratio (roll speed / line speed) of the roll speed to the line speed corresponding to the traveling speed of the strip s as a percentage (%).

공정조건Process conditions 상,하부 픽업롤Upper and lower pickup roll 상,하부 전달롤Upper and Lower Transfer Roll 상,하부 코팅롤Upper and Lower Coating Roll 직경(㎜)Diameter (mm) 200-220200-220 240-260240-260 250-280250-280 주속비(%)Main Speed Ratio (%) 23-2723-27 88-9288-92 118-122118-122 압하량(kg)Rolling amount (kg) 115-125115-125 95-10595-105 95-10595-105

한편, 기타의 공정조건을 살펴보면, 통상적으로 사용되는 절연 코팅용액은 유,무기질 코팅용액으로서 비중: 1.23~1.26, 점도: 13~14cps, 온도: 24~34℃의 조건을 가지며, 인입 스트립(s)의 온도는 28~40℃ 정도이고, 스트립 인입각은 3.0~4.5°이다.On the other hand, when looking at the other process conditions, commonly used insulating coating solution is an organic and inorganic coating solution, specific gravity: 1.23 ~ 1.26, viscosity: 13 ~ 14cps, temperature: 24 ~ 34 ℃ conditions, the incoming strip (s ) Temperature is 28 ~ 40 ℃, strip entry angle is 3.0 ~ 4.5 °.

위와 같은 공정조건에서 종래에는 최상의 코팅두께를 얻기 위하여 1/2리버스 코팅방법을 사용하여 스트립에 절연 코팅용액을 도포하였다. 여기서 1/2리버스 코팅방법이란, 코팅롤(13,23)이 스트립(s)의 진행방향과 반대방향으로 슬라이딩 접촉되면서 코팅롤(13,23)에 공급된 코팅액(4) 전량을 스트립(s)으로 전달할 수 있도록 코팅롤(13,23)의 회전방향을 결정하고, 전달롤(12,22)은 코팅롤(13,23)과 동일한 방향으로 회전하면서 마찬가지로 공급된 코팅액 전량이 코팅롤(13,23)에 전달할 수 있도록 구성하며, 픽업롤(11,21)은 전달롤(12,22)과 반대방향으로 회전하면서 레저버(14)에서 픽업한 코팅액(4)의 1/2을 전달롤(12,22)에 전달할 수 있도록 구성하는 방법이다.Under the above process conditions, the insulating coating solution was applied to the strip using a 1/2 reverse coating method in order to obtain the best coating thickness. Here, the 1/2 reverse coating method refers to the entire coating liquid 4 supplied to the coating rolls 13 and 23 while the coating rolls 13 and 23 are in sliding contact with each other in the direction in which the strips s travel. The rotational direction of the coating rolls 13 and 23 is determined so as to be delivered to the coating rolls, and the transfer rolls 12 and 22 rotate in the same direction as the coating rolls 13 and 23, while the entire amount of the coating liquid supplied is applied to the coating rolls 13. , 23, and the pickup rolls 11 and 21 rotate in the opposite directions to the transfer rolls 12 and 22 and transfer 1/2 of the coating liquid 4 picked up from the reservoir 14 to the transfer rolls. (12,22) is configured to be delivered to.

이와 같은 1/2리버스 코팅방법에 따르면, 픽업롤(11,21)에서 픽업하는 코팅액(4)의 양이 1이라 가정할 경우, 전달롤(12,22)에 1/2이 전달되며, 코팅롤(13,23) 또한 1/2을 공급받는다. 따라서, 코팅롤은 픽업롤(11,21)이 픽업한 코팅액의 1/2 정도를 스트립(s)에 도포한다.According to the 1/2 reverse coating method, when the amount of the coating liquid 4 picked up from the pickup rolls 11 and 21 is 1, 1/2 is transferred to the transfer rolls 12 and 22, and the coating is performed. The rolls 13 and 23 are also supplied with 1/2. Therefore, the coating roll is applied to the strip (s) about 1/2 of the coating liquid picked up by the pickup roll (11, 21).

그러나, 이와 같이 1/2리버스 코팅방법을 사용하여 최대한 높은 주속비 조건에서 절연코팅을 실시함에도 불구하고, 절연코팅 후 얻어질 수 있는 피막 최고 두께는 0.04~0.05mils 정도일 뿐, 고품질의 절연코팅에 요구되는 0.06∼0.08mils 정도의 두께를 얻는 데에는 한계가 있었다. 특히, 종래의 0.04~0.05mils 정도의 박막 코팅층은 코팅층의 박리현상이 나타날 뿐만 아니라 코팅층의 외관이 불량한 경우가 많았다.However, despite the insulation coating at the highest circumferential ratio condition using the 1/2 reverse coating method as described above, the maximum thickness of the film that can be obtained after the insulation coating is only about 0.04 to 0.05 mils. There was a limit in obtaining the required thickness of 0.06 to 0.08 mils. In particular, the conventional thin film coating layer of about 0.04 ~ 0.05mils was not only the peeling phenomenon of the coating layer but also the appearance of the coating layer was often poor.

또한, 종래의 경우, 코팅롤의 주속비가 높아 롤손상으로 인한 롤의 교체주기가 짧다는 문제가 있었다.In addition, in the related art, there is a problem that the replacement cycle of the roll due to roll damage is short due to a high circumferential speed ratio of the coating roll.

뿐만 아니라, 종래의 라인속도는 200∼250mpm로 조절되어 왔는 바, 생산능률의 향상을 위하여 300∼400mpm 정도의 라인속도에서도 코팅품질이 우수한 후막코팅을 가능게 하기 위한 2롤 타입 코팅기술의 개선이 요구되고 있다.In addition, the conventional line speed has been adjusted to 200 to 250mpm, and the improvement of the two-roll type coating technology to enable the thick film coating with excellent coating quality even at the line speed of 300 to 400mpm for the improvement of the production efficiency. It is required.

본 발명은 상술한 바와 같은 종래 기술상의 제반 문제점을 감안하여 이를 해결하고자 창출한 것으로, 300~400㎜ 정도의 라인속도에서 코팅롤의 훼손이 적으면서도 코팅품질이 우수하며 후막코팅이 가능하도록 한 무방향성 전기강판의 절연피막 코팅방법을 제공함에 그 주된 목적이 있다.The present invention has been made in view of the above-mentioned problems in the prior art, which was created to solve this problem, and the coating quality is excellent while the damage of the coating roll is reduced at a line speed of about 300 to 400 mm. Its main purpose is to provide an insulating coating method for a grain-oriented electrical steel sheet.

본 발명은 쿨링존과 건조로 사이에 세워 고정된 고정포스트와, 바닥면에 경사고정되고 고정포스트에 연결된 하부 리프트와, 고정포스트의 상단부에 연결되고 하부 리프트와 동일한 경사를 갖도록 고정된 상부 리프트와, 상부 및 하부 리프트에 각각 고정되고 서로 갭을 가지며 그 사이로 스트립이 통과되는 상부 및 하부 코팅롤과, 상부 코팅롤과 하부 코팅롤 사이로 인입되는 스트립의 상,하면에 절연코팅액을 도포하도록 배관된 노즐로 구성된 무방향성 전기강판의 2롤 타입 절연피막 코팅장치를 이용하여 냉간압연 후 탈탄, 소둔되어 인입되는 무방향성 전기강판용 스트립의 표면에 절연코팅할 때 절연코팅액을 0.08∼0.20mils로 코팅하기 위해,The present invention provides a fixed post fixed between the cooling zone and the drying furnace, a lower lift inclined to the bottom surface and connected to the fixed post, and an upper lift connected to the upper end of the fixed post and fixed to have the same inclination as the lower lift. Nozzles piped to apply insulating coating liquid to the upper and lower coating rolls fixed to the upper and lower lifts, respectively, having a gap therebetween, and having the strips passed therebetween, and the upper and lower surfaces of the strips introduced between the upper and lower coating rolls. In order to coat the insulation coating liquid with 0.08 to 0.20 mils when the insulation coating is performed on the surface of the strip for non-oriented electrical steel sheet which is decarburized, annealed and drawn after cold rolling using a two-roll type insulating film coating apparatus of non-oriented electrical steel sheet,

절연 코팅액은 비중 1.18∼1.24, 점도 12∼12.9cps의 무기질 절연 코팅액을 사용하며, 코팅에 사용하는 상,하부 코팅롤은 직경: 300∼350㎜, 주속비: 90∼100%, 압하량: 110~140kg로 설정하고, 스트립 인입각: 4~6°, 수직에 대한 상,하부 코팅롤과의 경사각: 5~11°, 롤간 편심: 2~8㎜로 설정하여 코팅하는 것을 특징으로 하는 무방향성 전기강판의 2롤 타입 절연피막 코팅장치를 이용한 코팅방법을 제공 하게 된다.Insulating coating liquid uses inorganic insulating coating liquid with specific gravity 1.18 ~ 1.24, viscosity 12 ~ 12.9cps. Upper and lower coating rolls used for coating are 300 ~ 350mm in diameter, 90 ~ 100% in rolling ratio, 110 It is set to ˜140kg, strip entry angle: 4-6 °, inclination angle with the upper and lower coating roll for the vertical: 5-11 °, eccentricity between rolls: non-directional coating, characterized in that the coating is set It provides a coating method using a two-roll type insulating film coating apparatus of electrical steel sheet.

본 발명은 300∼350mpm 정도의 라인속도에서도 코팅롤의 훼손이 적으며 코팅 표면이 미려한 절연코팅 품질 확보와 코팅롤 표면부 훼손을 최소화시켜 코팅롤 조기 교체에 따른 생산장애 시간을 줄일 수 있는 효과와 코팅 작업성이 향상되는 효과를 제공한다.The present invention is less damage of the coating roll at the line speed of about 300 ~ 350mpm and the effect of reducing the production failure time due to the early replacement of the coating roll by minimizing the damage of the coating coating surface and the surface of the coating roll to ensure the beautiful coating quality It provides the effect of improving the coating workability.

본 발명은 상기한 기술적 과제를 달성하기 위하여, 쿨링존과 건조로 사이에 세워 고정된 고정포스트와, 바닥면에 경사고정되고 고정포스트에 연결된 하부 리프트와, 고정포스트의 상단부에 연결되고 하부 리프트와 동일한 경사를 갖도록 고정된 상부 리프트와, 상부 및 하부 리프트에 각각 고정되고 서로 갭을 가지며 그 사이로 스트립이 통과되는 상부 및 하부 코팅롤과, 상부 코팅롤과 하부 코팅롤 사이로 인입되는 스트립의 상,하면에 절연코팅액을 도포하도록 배관된 노즐로 구성된 무방향성 전기강판의 2롤 타입 절연피막 코팅장치를 이용하여 냉간압연 후 탈탄, 소둔되어 인입되는 무방향성 전기강판용 스트립의 표면에 절연코팅할 때 절연코팅액을 0.08∼0.20mils로 코팅하기 위해, 절연 코팅액은 비중 1.18∼1.24, 점도 12∼12.9cps의 무기질 절연 코팅액을 사용하며, 코팅에 사용하는 상,하부 코팅롤은 직경: 300∼350㎜, 주속비: 90∼100%, 압하량: 110~140kg로 설정하고, 스트립 인입각: 4~6°, 수직에 대한 상,하부 코팅롤과의 경사각: 5~11°, 롤간 편심: 2~8㎜로 설정하여 코팅하는 무방향성 전기강판의 2롤 타입 절연피막 코팅장치를 이용한 코팅방법을 제공함에 의해 상기한 또 다른 기술적 과제를 달성할 수 있다.The present invention, in order to achieve the above technical problem, a fixed post fixed between the cooling zone and the drying furnace, a lower lift inclined to the bottom surface connected to the fixed post, and connected to the upper end of the fixed post and the lower lift and The upper and lower coating rolls fixed to have the same inclination, the upper and lower coating rolls fixed to the upper and lower lifts respectively, having a gap therebetween, and the strips passed therebetween, and the upper and lower surfaces of the strips introduced between the upper and lower coating rolls. Insulating coating liquid is applied to the surface of non-oriented electrical steel strip which is decarburized, annealed and drawn after cold rolling by using a two-roll type insulating film coating device of non-oriented electrical steel sheet composed of nozzles piped to apply insulating coating liquid In order to coat at 0.08 to 0.20 mils, the insulating coating liquid is inorganic insulating coating liquid having a specific gravity of 1.18 to 1.24 and a viscosity of 12 to 12.9 cps. The upper and lower coating rolls used for coating are set to diameter: 300 to 350 mm, circumferential speed ratio: 90 to 100%, rolling reduction: 110 to 140 kg, and strip entry angle: 4 to 6 °. The inclination angle with the upper and lower coating rolls: 5 to 11 °, the eccentricity between rolls: 2 to 8 mm to provide a coating method using a two-roll type insulating film coating apparatus of non-oriented electrical steel sheet for coating. Technical challenges can be achieved.

이하에서는, 첨부도면을 참고하여 본 발명에 따른 바람직한 실시예를 보다 상세하게 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

도 3은 본 발명을 설명하기 위한 2롤 타입 절연 코팅장치의 예시도이다.Figure 3 is an illustration of a two-roll type insulating coating apparatus for explaining the present invention.

먼저, 본 발명 방법을 제시하기 위한 코팅장치를 설명하자면, 도 3에서와 같이 본 발명 코팅장치는 스트립(s)이 쿨링존(100)에서 건조로(200)로 이동하는 경로상에 설치되어 패스롤(300)을 경유하여 진행하는 스트립(s)의 양 표면에 절연코팅액을 도포하게 되는데 도포방식은 노즐(N)을 통한 직접 분사와 두 개의 코팅롤을 이용하여 직접 코팅하는 방식이다.First, referring to the coating apparatus for presenting the method of the present invention, as shown in FIG. 3, the coating apparatus of the present invention is installed on a path through which a strip s moves from the cooling zone 100 to the drying furnace 200. Insulating coating liquid is applied to both surfaces of the strip (s) that proceeds via the roll 300. The coating method is a method of directly spraying through the nozzle N and directly coating using two coating rolls.

이러한 코팅장치는 바닥면에 세워 설치된 고정포스트(400)를 포함한다.This coating device includes a fixed post 400 installed on the bottom surface.

이때, 상기 고정포스트(400)에는 서로 간격을 두고 상,하부 연결바(410a,410b)가 고정된다.At this time, the fixing post 400 is fixed to the upper and lower connection bars (410a, 410b) at intervals from each other.

그리고, 상기 하부 연결바(410a)에는 하부 리프트(420)가 고정되고, 상기 상부 연결바(410b)에는 상부 리프트(450)가 고정된다.In addition, a lower lift 420 is fixed to the lower connection bar 410a, and an upper lift 450 is fixed to the upper connection bar 410b.

아울러, 상기 상,하부 리프트(420,450)에는 각각 하부 코팅롤(430)과 상부 코팅롤(440)이 설치된다.In addition, the upper and lower lifts 420 and 450 are provided with a lower coating roll 430 and an upper coating roll 440, respectively.

여기에서, 상기 상,하부 코팅롤(430,440)은 후술하겠으나 서로 2~8㎜의 편심을 갖고 그 축중심이 어긋나게 설치되며, 이를 위해 상기 상,하부 리프트(420,450)가 경사지게 설치되는바, 그 경사각은 수직선에 대하여 5~11°를 유지하도록 함이 바람직하다.Here, the upper and lower coating rolls 430 and 440 will be described later, but have an eccentricity of 2 to 8 mm and the shaft centers are alternately installed. For this purpose, the upper and lower lifts 420 and 450 are installed to be inclined. It is preferable to maintain 5 to 11 degrees with respect to the vertical line.

덧붙여, 상부 리프트(450)의 경우에는 경사각 조절을 위한 수단이 더 구비될 수 있는데, 이는 링크(460)와 작동실린더(480)에 의해 달성될 수 있다.In addition, in the case of the upper lift 450, a means for adjusting the inclination angle may be further provided, which may be achieved by the link 460 and the operation cylinder 480.

즉, 상기 고정포스트(400)의 상단에 링크(460)의 중심을 축(470)으로 고정하고, 그 양단에 각각 상부 리프트(450)의 후단과 작동실린더(480)의 선단을 연결하며, 상부 연결바(410b)의 일단에 상기 작동실린더(480)의 하단을 유동가능하게 연결하는 형태로 이루어질 수 있다.That is, the center of the link 460 is fixed to the upper end of the fixed post 400 by the shaft 470, and both ends thereof connect the rear end of the upper lift 450 and the front end of the operation cylinder 480, respectively, One end of the connection bar 410b may be formed in such a way as to fluidly connect the lower end of the operation cylinder 480.

그리하여, 작업조건에 따라 필요시 상부 코팅롤(440)의 위치를 변경할 수 있는데, 이는 코팅액이 스트립(s) 상면에서는 정체량이 많음에 반해, 하면에서는 정체됨이 없이 곧바로 낙하 제거되기 때문에 그 코팅두께를 용이하게 조절하기 위함이다.Thus, if necessary, the position of the upper coating roll 440 can be changed according to the working conditions, because the coating liquid has a large amount of stagnation on the upper surface of the strip (s), whereas the coating thickness falls down immediately without stagnation. This is to easily adjust.

그리고, 도시하지는 않았지만 낙하된 코팅액은 별도의 코팅액받이에 수납된 후 재사용되도록 함이 바람직하다.And, although not shown, it is preferable that the dropped coating liquid is stored in a separate coating liquid container and then reused.

따라서, 진행하는 스트립(s)의 표면에는 그 표면과 상,하부 코팅롤(430,440)간의 갭만큼 코팅액이 도포되게 된다.Therefore, the coating liquid is applied to the surface of the strip (s) that is advanced by the gap between the surface and the upper and lower coating rolls (430, 440).

다음, 본 발명에 따른 각 롤의 공정조건을 표로 정리하면 다음과 같다.Next, the process conditions of each roll according to the present invention are summarized as follows.

항목 Item 롤직경(㎜) Roll diameter (mm) 스트립인입각 (수평선기준)Strip Entry Angle (Based on Horizontal Line) 상,하 코팅롤간 경사각(수직선기준)Tilt angle between the top and bottom coating rolls (vertical line) 상,하코팅롤간 편심(㎜)Eccentricity between upper and lower coating rolls (mm) 2롤타입 절연코팅조건2-roll type insulation coating condition 300-350 300-350 4-6° 4-6 ° 5-11° 5-11 ° 2-8° 2-8 °

냉간압연 후 탈탄, 소둔되어 인입되는 무방향성 전기강판용 스트립은, 종래와는 다르게 2롤 타입 코팅방법에 의해 절연코팅되며, 상,하부 코팅롤(430,440)간 압하량은 110~140㎏으로 설정하여 적용하는 것이 바람직하다.The strip for non-oriented electrical steel sheet, which is decarburized and annealed and drawn after cold rolling, is insulated coated by a two-roll type coating method unlike the conventional method, and the rolling reduction amount between the upper and lower coating rolls (430,440) is set to 110 to 140 kg. It is desirable to apply.

*먼저, 상,하부 코팅롤(430,440)의 직경을 300∼350㎜로 유지하는 이유를 살펴본다.First, the reason for maintaining the diameter of the upper and lower coating rolls 430 and 440 to 300 to 350 mm will be described.

상기 상,하부 코팅롤(430,440)의 직경을 300㎜ 이하로 할 경우, 스트립(s)에 도포되는 코팅액의 두께가 0.08∼0.20mils 정도로 유지될 수 있도록 하기 위해서는 상,하부 코팅롤(430,440)에 묻혀지는 절연코팅량을 과다하게 도포해야 하며, 이는 절연코팅시 코팅액이 흘러내리거나 건조력이 떨어져 코팅의 표면이 거칠어지게 된다.When the diameter of the upper and lower coating rolls 430 and 440 is 300 mm or less, the upper and lower coating rolls 430 and 440 may be used to maintain the thickness of the coating liquid applied to the strip s at about 0.08 to 0.20 mils. The amount of insulation coating to be buried must be applied excessively, which causes the coating liquid to flow down or the drying force to be reduced, resulting in a rough surface of the coating.

또한, 상,하부 코팅롤(430,440)의 직경을 350㎜ 이상이 되도록 할 경우, 스트립(s)의 표면에 절연 코팅액이 과다하게 도포된다.In addition, when the diameter of the upper and lower coating rolls 430 and 440 is 350 mm or more, the insulating coating solution is excessively applied to the surface of the strip s.

따라서, 이 경우 주속비를 100% 이하로 낮추어 스트립(s) 표면에 도포되는 절연코팅용액의 두께를 얇게 할 필요가 있다.Therefore, in this case, it is necessary to lower the peripheral speed ratio to 100% or less to reduce the thickness of the insulating coating solution applied to the surface of the strip s.

그러나, 스트립(s)의 진행속도보다 코팅롤의 회전속도를 낮게 설정하는 경우, 코팅롤의 표면이 심하게 훼손(스트립의 속도와 연동됨이 없이 끌려가는 현상으로 스트립과 롤 접촉부간 과다마찰로 인한 롤 표면부 조기훼손)되는 문제가 발생된다.However, if the rotational speed of the coating roll is set lower than the traveling speed of the strip s, the surface of the coating roll is severely damaged (a phenomenon in which the surface of the coating roll is dragged without being linked with the speed of the strip, resulting from excessive friction between the strip and the roll contact portion. Premature damage to the roll surface) occurs.

다음으로, 스트립 인입각(수평선기준)을 4~6도로 한정한 이유를 살펴본다.Next, look at the reasons for limiting the strip entry angle (horizontal basis) to 4-6 degrees.

스트립 인입각(수평선기준)을 4도 이하로 설정시 스트립(s)이 누르는 힘이 과해 하부 코팅롤(430)에 과부하로 인해 조기 훼손은 물론 코팅표면이 거칠어지고, 상하부간 두께 편차를 가져온다.When the strip inlet angle (horizontal line reference) is set to 4 degrees or less, the force applied by the strip s is excessive, resulting in premature damage as well as roughness of the coating surface due to overloading the lower coating roll 430, resulting in thickness variation between the upper and lower portions.

스트립 인입각(수평선기준)을 6도 이상으로 할 경우에는 스트립과 패스롤(300)간 접촉 불량으로 인해 미세한 긁힌흠 발생 및 상하부 코팅면에 두께 편차가 발생된다.When the strip entry angle (horizontal line reference) is 6 degrees or more, fine scratches occur due to poor contact between the strip and the pass roll 300, and thickness deviations occur on the upper and lower coating surfaces.

그리고, 상,하부 코팅롤(430,440)간 경사각(수직선기준)을 5도 이하로 설정할 경우 상,하부 코팅롤(430,440)간 중심이 수직선에 가까워지면서 상,하부 코팅롤(430,440)에 가해지는 압하력이 증가하여 스트립과의 마찰력 증가 및 코팅층이 불균일하게 형성되므로 부적합하다.When the inclination angle (vertical line reference) between the upper and lower coating rolls 430 and 440 is set to 5 degrees or less, the center of the upper and lower coating rolls 430 and 440 is closer to the vertical line, and the pressure is applied to the upper and lower coating rolls 430 and 440. It is unsuitable because the force is increased so that the friction force with the strip is increased and the coating layer is formed unevenly.

한편, 상,하부 코팅롤(430,440)간 경사각(수직선기준)을 11도 이상으로 설정하게 되면 상,하부 코팅롤(430,440)간 중심선이 일치되어 하부 코팅롤(430)에 가해지는 힘이 너무 과해 스트립(s)과 미끄러짐 발생으로 코팅층이 불균일하며, 하부 코팅롤(430)의 표면 손상이 과해 조기에 코팅롤을 교체해야 하는 문제가 야기된다.On the other hand, when the inclination angle (vertical line reference) between the upper and lower coating rolls (430, 440) is set to 11 degrees or more, the center line between the upper and lower coating rolls (430, 440) coincides with the force applied to the lower coating roll (430) too much. The coating layer is uneven due to the strip s and the slip, and the surface coating of the lower coating roll 430 is excessive, causing a problem that the coating roll needs to be replaced early.

아울러, 상,하부 코팅롤(430,440)간 편심(㎜)을 2㎜ 이하로 설정시 상,하부 코팅롤(430,440)간 무게중심이 일치되어 하부 코팅롤(430)에 가해지는 압력이 증가하여 롤 표면부 훼손은 물론 스트립 하부 코팅층이 거칠어지며, 반면 상,하부 코팅롤(430,440)간 편심(㎜)을 8㎜ 이상로 할 경우에는 상,하부 코팅롤(430,440)간 무게중심 과다 이격에 따른 스트립(s) 상하부 표면에 도포되는 절연 코팅층이 고르지 못하는 문제가 야기된다.In addition, when the eccentricity (mm) between the upper and lower coating rolls (430, 440) is set to 2 mm or less, the center of gravity between the upper and lower coating rolls (430, 440) is coincident with the pressure applied to the lower coating roll (430), thereby increasing the roll. In addition to damage to the surface portion, the lower coating layer of the strip becomes rough, whereas when the eccentricity (mm) between the upper and lower coating rolls 430 and 440 is 8 mm or more, the strip due to the excessive center of gravity between the upper and lower coating rolls 430 and 440. (s) A problem arises that the insulating coating layer applied to the upper and lower surfaces is uneven.

그러므로, 상술한 조건에 합당하게 설계함이 바람직하다.Therefore, it is desirable to design appropriately for the conditions described above.

이하, 실시예에 대하여 설명하기로 하며, 설명의 편의상 도면부호는 생략하기로 한다.Hereinafter, exemplary embodiments will be described, and reference numerals will be omitted for convenience of description.

[실시예]EXAMPLE

절연코팅은, C: 0.04~0.07wt% , Si: 2.5~4.0wt%, Mn: 0.5~0.25wt%, P: 0.03wt%, S:0.02wt% , Al: 0.1wt%, N: 0.01wt% 잔부 Fe 및 기타 불가피하게 함유되는 불순물로 조성되는 무방향성 전기강판용 스트립(강종: PN23)을 0.5㎜두께로 냉간압연하고, 압연된 스트립을 860~1,100℃온도에서 2~4분가량 정체시간을 두어 탈탄, 소둔처리한 다음, 2롤 코팅장치를 사용하여 스트립의 표면에 정방향 코팅방법으로 연속적으로 절연코팅액을 도포하는 방법으로 실시하였다.Insulation coating is C: 0.04 ~ 0.07wt%, Si: 2.5 ~ 4.0wt%, Mn: 0.5 ~ 0.25wt%, P: 0.03wt%, S: 0.02wt%, Al: 0.1wt%, N: 0.01wt Cold rolled strip for non-oriented electrical steel sheet (steel grade: PN23) composed of% residual Fe and other unavoidable impurities (steel grade: PN23) to 0.5 mm thickness, and the rolled strip was held for 2-4 minutes at a temperature of 860-1,100 ℃. After the decarburization and annealing, and then using a two-roll coating apparatus was carried out by the method of continuously applying an insulating coating liquid to the surface of the strip by a forward coating method.

300∼400mpm의 라인속도에서 절연코팅액을 0.08∼0.20mils로 코팅할 수 있도록, 절연 코팅액은 비중 1.18∼1.24, 점도 12∼12.9cps의 무기질 절연 코팅액을 사용하며, 상,하부 코팅롤은 직경:300∼350㎜, 주속비:90∼100%, 압하량:110~140kg, 스트립 인입각:4~ 6도, 수직에 대한 상,하부 코팅롤과의 경사각:5~11도, 롤간 편심:2~8㎜로 각각 설정하여 코팅완료된 절연피막의 품질을 평가하기 위해 응력제거소둔전의 피막외관, 절연성, 밀착성, 내식성 및 용접성과 응력제거소둔 후의 피막박리현상 및 절연성을 비교하였으며, 그 비교방법은 아래와 같다.In order to coat the insulation coating liquid at 0.08 to 0.20 mils at the line speed of 300 to 400mpm, the inorganic coating liquid is used as the inorganic coating liquid having a specific gravity of 1.18 to 1.24 and the viscosity of 12 to 12.9 cps. The upper and lower coating rolls have a diameter of 300 350 mm, circumferential speed ratio: 90 to 100%, rolling reduction: 110 to 140 kg, strip entry angle: 4 to 6 degrees, inclination angle with upper and lower coating rolls relative to vertical: 5 to 11 degrees, eccentricity between rolls: 2 to In order to evaluate the quality of the coated insulating film by setting it to 8mm, the film appearance, insulation, adhesion, corrosion resistance, weldability and weldability after stress relief annealing were compared before the stress relief annealing, and the comparison method is as follows. .

즉, 응력제거소둔(Stress Relief Annealing: SRA)은 전기절연피막재를 건조한 100% N2 가스 분위기에서 750℃에서 2시간동안 열처리를 실시하였다.That is, the stress-relief annealing (Stress Relief Annealing: SRA) is 100% dry, the electrical insulation film material N 2 Heat treatment was performed at 750 ° C. for 2 hours in a gas atmosphere.

이때, 표면외관은 얼룩, 줄무늬 등을 육안 관찰하여 종합적으로 평가하였으며, 얼룩 및 줄무늬 현상이 없을수록 피막외관을 양호한 것으로 평가하였다.At this time, the surface appearance was evaluated by visual observation of stains, streaks, and the like, and the film appearance was evaluated as good as there were no stains and streaks.

그리고, 절연성은 300psi 압력하에서 입력 0.5V, 1.0A의 전류를 통하였을 때의 수납전류값(Amps)으로 평가하되, 통상의 기준에 따라 SAR전의 경우 0.10~0.14Amps이면 양호, 0.14~0.90Amps 정도면 불량으로 판단하였으며, SAR후의 경우는 0.40Amps 이하이면 양호, 0.14Amps 이상이면 불량인 것으로 판단하였다.Insulation is evaluated by the storage current value (Amps) when the current is input through 0.5V, 1.0A under 300psi pressure, but in the case of SAR, 0.10 ~ 0.14Amps is good, about 0.14 ~ 0.90Amps. It was determined that the surface was defective, and in the case of SAR after 0.40 Amps or less, it was considered good, and when it was above 0.14 Amps.

또한, 밀착성(㎜φ)은 소둔 후 시편을 10, 20, 30∼100㎜φ인 원호를 갖는 환봉 주위에 접하여 180˚구부릴 때 피막박리가 없는 최소 원호직경으로 평가하되 10㎜에서 박리가 되면 양호, 20㎜에서 박리가 되면 보통, 30~100㎜에서 박리가 되면 불량으로 판단하였다. 내식성은 1년간 실내방치 및 3개월간 옥외폭로시의 피막표면의 녹 발생 유무를 병행하여 육안 관찰하여 나타내었다.In addition, the adhesiveness (mmφ) should be evaluated as the minimum arc diameter without film peeling when the specimen is bent 180 ° by bending around an annular bar having an arc of 10, 20, 30-100mmφ after annealing, but should be peeled off at 10mm. When it peeled at 20 mm, it was judged as defect normally when peeled at 30-100 mm. Corrosion resistance was observed by visual observation with the presence of rust on the surface of the film during 1 year indoor exposure and 3 months outdoor exposure.

그리고, 용접성은 TIG용접(용접전류:150A, 전극:pure-W(3.2㎜φ), 전극 갭:0.35㎜, 용접속도:15㎜/sec)후 용접 비드부에 나타나는 외관형상 및 블로우 홀(blow hole)생성 여부를 육안 관찰하여 평가하였다.The weldability and appearance are shown in the weld bead after TIG welding (welding current: 150A, electrode: pure-W (3.2 mmφ), electrode gap: 0.35 mm, welding speed: 15 mm / sec). Hole formation was evaluated by visual observation.

마지막으로, 피막박리는 응력제거소둔 후의 피막상에 점착테이프(폴리프로필렌)를 부쳤다 떼었을 때 나타나는 피막박리분의 부착 유무로 판단하였다.Finally, the film peeling was judged by the presence or absence of adhesion of the film peeling powder which appeared when the adhesive tape (polypropylene) was attached to the film after the stress relief annealing.

실험결과, 종래와 동일한 압하량 조건하에서, 상,하부 픽업롤의 직경 300∼350㎜, 주속비 15∼22%이고, 상,하부 전달롤의 직경 360∼410㎜, 주속비: 80∼87%이고, 상,하부 코팅롤의 직경 390∼420㎜, 주속비 100∼110% 일 때 절연코팅층의 품질이 우수한 것으로 나타났다.As a result of the experiment, under the same rolling reduction conditions, the upper and lower pick-up rolls had a diameter of 300 to 350 mm and a circumferential speed ratio of 15 to 22%, and the upper and lower transfer rolls had a diameter of 360 to 410 mm and a circumferential speed ratio: 80 to 87%. When the diameter of the upper and lower coating rolls was 390 to 420 mm and the peripheral speed ratio was 100 to 110%, the quality of the insulating coating layer was excellent.

즉, 아래의 표 3에서 볼 수 있는 바와 같이, 절연코팅의 외관, 절연성, 내식성, 용접성이 우수한 것으로 나타났으며, 응력제거소둔 열처리 후 피막의 박리현상이나 절연성은 거의 저하되지 않는 것으로 나타났다.That is, as can be seen in Table 3 below, the appearance of the insulation coating, insulation, corrosion resistance, weldability was found to be excellent, the peeling phenomenon or insulation of the film after the stress relief annealing was found to hardly decrease.

구분  division 응력제거소둔전 Before stress relief annealing 응력제거소둔후 After stress relief annealing 피막외관 Outer appearance 절연성 (Amps)Insulation (Amps) 밀착성 (㎜φ)Adhesiveness (mmφ) 내식성Corrosion resistance 용접성 Weldability 피막 박리현상Film peeling phenomenon 절연성 (Amps)Insulation (Amps) 실내inside 실외Outdoor 품질 quality 양호 Good 0.1-0.13 0.1-0.13 10 10 양호 Good 양호 Good 양호 Good 없음 none 0.1-0.3 0.1-0.3

도 1은 종래 3롤 타입의 코팅장치를 보인 예시도,1 is an exemplary view showing a conventional three roll type coating apparatus,

도 2는 도 1에 도시된 코팅장치의 요부를 보인 작동상태도,Figure 2 is an operating state showing the main portion of the coating apparatus shown in FIG.

도 3은 본 발명에 따른 2롤 타입 코팅장치의 예시도.Figure 3 is an illustration of a two roll type coating apparatus according to the present invention.

♧ 도면의 주요 부분에 대한 부호의 설명 ♧♧ description of the symbols for the main parts of the drawing ♧

400....고정포스트 420....하부 리프트400 .... Fixed post 420 .... Lower lift

430....하부 코팅롤 440....상부 코팅롤430 .... Lower coating roll 440 .... Upper coating roll

450....상부 리프트 460....링크450 .... Top Lift 460 ... Link

470....축 480....작동실린더470 .... axis 480 .... operating cylinder

Claims (1)

쿨링존과 건조로 사이에 세워 고정된 고정포스트와, 바닥면에 경사고정되고 고정포스트에 연결된 하부 리프트와, 고정포스트의 상단부에 연결되고 하부 리프트와 동일한 경사를 갖도록 고정된 상부 리프트와, 상부 및 하부 리프트에 각각 고정되고 서로 갭을 가지며 그 사이로 스트립이 통과되는 상부 및 하부 코팅롤과, 상기 상부 코팅롤과 하부 코팅롤 사이로 인입되는 스트립의 상,하면에 절연코팅액을 도포하도록 배관된 노즐로 구성된 무방향성 전기강판의 2롤 타입 절연피막 코팅장치를 이용하여 냉간압연후 탈탄, 소둔되어 인입되는 무방향성 전기강판용 스트립의 표면에 절연코팅할 때 절연코팅액을 0.08∼0.20mils로 코팅하기 위해,A fixed post fixed between the cooling zone and the drying furnace, a lower lift inclined to the bottom and connected to the fixed post, an upper lift connected to the upper end of the fixed post and fixed to the same slope as the lower lift, The upper and lower coating rolls fixed to the lower lift and having a gap therebetween, and the strips passed therebetween, and nozzles piped to apply the insulating coating liquid to the upper and lower surfaces of the strip introduced between the upper coating roll and the lower coating roll. In order to coat the insulation coating liquid with 0.08 ~ 0.20mils when insulation coating on the surface of non-oriented electrical steel strip which is decarburized, annealed and drawn after cold rolling by using 2 roll type insulating film coating device of non-oriented electrical steel sheet, 절연 코팅액은 비중 1.18∼1.24, 점도 12∼12.9cps의 무기질 절연 코팅액을 사용하며,Insulating coating liquid uses inorganic insulating coating liquid having a specific gravity of 1.18 to 1.24 and viscosity of 12 to 12.9 cps. 코팅에 사용하는 상,하부 코팅롤은 직경: 300∼350㎜, 주속비: 90∼100%, 압하량: 110~140kg로 설정하고,The upper and lower coating rolls used for coating are set to diameter: 300 to 350 mm, circumferential speed ratio: 90 to 100%, rolling reduction: 110 to 140 kg, 스트립 인입각: 4~6°, 수직에 대한 상,하부 코팅롤과의 경사각: 5~11°, 롤간 편심: 2~8㎜로 설정하여 코팅하는 것을 특징으로 하는 무방향성 전기강판의 2롤 타입 절연피막 코팅장치를 이용한 코팅방법.Strip inlet angle: 4 ~ 6 °, inclination angle with upper and lower coating rolls about vertical: 5 ~ 11 °, eccentricity between rolls: 2 roll type of non-oriented electrical steel sheet, characterized in that the coating is set to 2-8mm Coating method using insulation coating device.
KR1020080117095A 2008-11-24 2008-11-24 Coating method for coating insulation film of non-oriented electrical steel sheet KR100914473B1 (en)

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JPS60138016A (en) * 1983-12-27 1985-07-22 Kawasaki Steel Corp Improvement of insulating film characteristic of grain oriented silicon steel sheet
JPS637385A (en) * 1986-06-26 1988-01-13 Kawasaki Steel Corp Device for coating separating agent for annealing onto electrical steel sheet
JPH06335649A (en) * 1993-05-28 1994-12-06 Kawasaki Steel Corp Both-faces simultaneous coating apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138016A (en) * 1983-12-27 1985-07-22 Kawasaki Steel Corp Improvement of insulating film characteristic of grain oriented silicon steel sheet
JPS637385A (en) * 1986-06-26 1988-01-13 Kawasaki Steel Corp Device for coating separating agent for annealing onto electrical steel sheet
JPH06335649A (en) * 1993-05-28 1994-12-06 Kawasaki Steel Corp Both-faces simultaneous coating apparatus

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