KR100807682B1 - Workpiece moving device for billets in induction heating furnace - Google Patents

Workpiece moving device for billets in induction heating furnace Download PDF

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KR100807682B1
KR100807682B1 KR1020010062502A KR20010062502A KR100807682B1 KR 100807682 B1 KR100807682 B1 KR 100807682B1 KR 1020010062502 A KR1020010062502 A KR 1020010062502A KR 20010062502 A KR20010062502 A KR 20010062502A KR 100807682 B1 KR100807682 B1 KR 100807682B1
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South Korea
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furnace
billet
induction heating
induction
heating furnace
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KR1020010062502A
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Korean (ko)
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KR20030030388A (en
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조기현
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주식회사 포스코
재단법인 포항산업과학연구원
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • F27B2009/122—Preheating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

본 발명은 유도가열로 내부의 소재 이송빔과 소재의 접촉형태를 개선하여 가열대상인 빌레트 소재의 온도 균일화를 꾀하고 소요 전력에너지를 절감시킬 수 있도록 한 빌레트용 유도가열로의 소재이송장치에 관한 것이다.The present invention relates to a material transfer apparatus for a billet induction furnace for improving the contact form of the material transfer beam and the material inside the induction furnace to achieve uniform temperature of the billet material to be heated and to reduce the power energy required. .

본 발명은 강관 소재인 원형빌레트를 이송시키면서 예열시킬 수 있도록 구성된 유도가열로의 소재이송장치에 있어서; 상기 소재가 통과되는 유도가열로의 로내 내화벽의 바닥면에 다수 형성된 반원형상의 설치홈과; 상기 소재의 바닥면과 구름접촉되도록 상기 설치홈에 유동가능하게 안치된 구형상의 이송볼을 포함하여 구성된다.The present invention provides a material transfer apparatus for an induction furnace configured to be preheated while transferring a circular billet of steel pipe material; Semi-circular installation grooves formed in the bottom surface of the furnace fire wall of the induction heating furnace through which the material passes; It is configured to include a spherical conveying ball seated in the installation groove so as to be in contact with the bottom surface of the material.

본 발명에 따르면, 강관 제조시 발생하는 품질 불량률을 현저히 낮출 수 있고, 후공정과의 일치도를 증대시키게 되어 가열로 처리 능력향상이 가능하며, 소재의 목표온도 저하의 문제가 해결됨에 따라 승온에너지의 절감을 꾀할 수 있다.According to the present invention, it is possible to significantly lower the quality defect rate generated during the production of steel pipes, increase the consistency with the post-processing process to improve the heat treatment capacity, and the problem of lowering the target temperature of the material is solved. Savings can be made.

Description

빌레트용 유도가열로의 소재이송장치{WORKPIECE MOVING DEVICE FOR BILLETS IN INDUCTION HEATING FURNACE}WORKPIECE MOVING DEVICE FOR BILLETS IN INDUCTION HEATING FURNACE}

도 1은 일반적인 유도가열로의 개략적인 모식도,1 is a schematic diagram of a typical induction furnace,

도 2a는 유도가열원리를 설명하기 위한 설명도,2A is an explanatory diagram for explaining the principle of induction heating;

도 2b는 종래 유도가열로의 소재이송장치를 보인 단면도 및 요부 사시도,Figure 2b is a cross-sectional view and a perspective view of the main portion showing the conventional material transfer apparatus in induction furnace,

도 3은 본 발명에 따른 유도가열로의 소재이송장치를 보인 단면도,3 is a cross-sectional view showing a material transfer device of the induction furnace according to the present invention;

도 4는 본 발명에 따른 소재이송장치의 일부 단면도 및 요부 사시도.4 is a partial cross-sectional view and a perspective view of the main portion of the material transfer apparatus according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 : 소재 12 : 내화벽1: Material 12: Fireproof Wall

18 : 이송볼 19 : 설치홈18: transfer ball 19: mounting groove

본 발명은 유도가열로 내부의 소재 이송빔과 소재의 접촉형태를 개선하여 가열대상인 빌레트 소재의 온도 균일화를 꾀하고 소요 전력에너지를 절감시킬 수 있도록 한 빌레트용 유도가열로의 소재이송장치에 관한 것이다.The present invention relates to a material transfer apparatus for a billet induction furnace for improving the contact form of the material transfer beam and the material inside the induction furnace to achieve uniform temperature of the billet material to be heated and to reduce the power energy required. .

일반적으로 유도 가열로는 도 1과 같이 장입시부터 가열을 시작하는 순서 에 따라 제1가열대(2), 제2가열대(3), 제3가열대(4)로 이루어진 가열대부분과 소재(1)인 빌레트(Billet)를 밀어서 장입시키는 소재장입기(5), 상기 제3가열대(4)를 지나온 소재(1)를 일정온도로 유지하면서 후공정과의 공정일치를 위해 일종의 버퍼역할을 하는 홀딩챔버(8), 그리고 상기 홀딩챔버(8)로부터 소재(1)를 취부하여 추출하는 소재추출기(6), 소재(1)를 압출공정으로 밀어주는 리젝터(9), 강종마다 일정한 설정온도로 유지시키기 위해 소재(1)의 온도를 검출하는 복사온도계(7)를 포함하여 구성된다.In general, the induction heating furnace is a heating zone portion and the material (1) consisting of the first heating zone (2), the second heating zone (3), the third heating zone (4) in order to start heating from the time of charging as shown in FIG. The holding chamber which serves as a buffer for the process matching with the post process while maintaining the material 1 passing through the billet (Billet) and the material 1 passing through the third heating table 4 at a constant temperature ( 8) and a material extractor 6 which mounts and extracts the material 1 from the holding chamber 8, a rejector 9 which pushes the material 1 to the extrusion process, and to maintain a constant set temperature for each steel grade. The radiation thermometer 7 which detects the temperature of the raw material 1 is comprised.

소재(1)는 강관용으로서 원형단면을 갖는 빌레트이고, 설정된 타이머의 신호에 따라 대략 37 mm의 스트로크를 유지하면서 소재장입기(5)에 의해 한개씩 로 내부로 장입되며, 로 내부에서는 소재끼리 연속적인 접촉을 유지하면서 좌에서 우로 이송되게 된다.The material 1 is a billet having a circular cross section for steel pipes, and is charged into the furnace one by one by the material inserter 5 while maintaining a stroke of approximately 37 mm according to a set timer signal. It is transferred from left to right while maintaining normal contact.

이때, 도 2a의 도시와 같은 유도가열원리에 의해 소재(1)가 가열되게 되는 바, 이를테면 유도코일(16)에 교류전류(17)를 통하면 유도코일(16) 주변의 교류전류(17)에 의한 자기장(14)이 발생하고 이 자기장(14)속에 놓인 도전체인 소재(1)에는 유도전류(15)가 발생하게 된다. 이 전류를 와전류(Eddy Current)라 하고 피가열체인 소재(1)의 고유저항과 와전류에 의한 주울열이 발생하며 이를 와전류 손실이라 하고 유도가열시의 발열원이 된다.At this time, the material 1 is heated by the induction heating principle as shown in FIG. 2A. For example, if the induction coil 16 passes through the alternating current 17, the alternating current 17 around the induction coil 16. The magnetic field 14 is generated and the induced current 15 is generated in the material 1, which is a conductor placed in the magnetic field 14. This current is called Eddy Current and Joule heat is generated by the resistivity and eddy current of the material 1 to be heated. This is called Eddy Current Loss and it is a heating source during induction heating.

그러나, 도 2b에서와 같이, 소재(1)를 안내하는 이송빔(13)이 호형상의 요입만곡 형태로 형성되기 때문에 소재(1)와 이송빔(13) 사이에는 상당히 넓은 면에 걸쳐 접촉됨으로써 소재(1) 하부의 온도가 그 상부보다 매우 낮게 형성되어 심한 온 도편차를 유발하게 되고 이 온도편차는 후공정인 압출시 강관 표면에 결함을 유발시키거나 압출공정을 정상적으로 수행할 수 없는 상태를 만들기도 하며, 특히 유도가열로의 내부는 약 1250 ℃ 정도로 매우 고온이므로 설비를 보호하기 위해 다수의 냉각관(10)을 구비하고 있으므로 그 냉각작용에 의해 국부적인 냉각이 더욱 가속되게 된다.However, as shown in FIG. 2B, since the conveying beam 13 for guiding the raw material 1 is formed in an arc-shaped concave curvature form, the contact between the raw material 1 and the conveying beam 13 is considerably wider. The temperature of the lower part of the material (1) is formed much lower than the upper part, which causes severe temperature deviation. This temperature deviation may cause defects on the surface of the steel pipe during extrusion, which is a post-process, or may not perform the extrusion process normally. In particular, since the inside of the induction furnace is very high temperature of about 1250 ℃ is provided with a plurality of cooling tubes 10 to protect the facility, the local cooling is further accelerated by the cooling action.

이러한 현상을 억제하기 위해서는 소재 하부의 가열패턴을 다른 위치보다 강하게 해주거나 혹은 소재(1)를 로 내부에서 부상시키는 방법이 있기는 하나, 유도가열의 특성상 동일한 위치에서 소재(1) 단면부의 차등가열이 불가능한 실정이며, 소재(1)의 이동 메커니즘 특성상 반드시 로 내의 바닥면과 접촉이 되는 상태로 소재를 이송시켜야만 하므로 로 내에서 소재(1) 하부의 국부적인 온도강하 문제를 해결하는 것은 매우 어려운 문제이다.In order to suppress this phenomenon, there is a method of making the heating pattern of the lower part of the material lower than other positions or floating the material (1) in the furnace, but the differential heating of the cross section of the material (1) at the same position due to the induction heating This is impossible and it is very difficult to solve the local temperature drop problem of the lower part of the material 1 in the furnace because the material must be transported in contact with the bottom surface of the furnace due to the movement mechanism of the material 1. to be.

본 발명은 상기 설명한 종래 기술의 문제점을 해결하기 위하여 이루어진 것으로, 로내에서 소재의 온도편차가 발생하는 것을 최소화하고 이송하는데 요구되는 장입력도 저감시킴으로써 압출시 강관의 품질을 향상시킴은 물론 소재 가열시 요구되는 최소온도를 저전력량으로도 확보할 수 있도록 한 빌레트용 유도가열로의 소재이송장치를 제공함에 그 목적이 있다.The present invention has been made in order to solve the problems of the prior art described above, by minimizing the occurrence of the temperature deviation of the material in the furnace and reducing the field input required to transport to improve the quality of the steel pipe during extrusion as well as during material heating It is an object of the present invention to provide a material transfer device for a billet induction heating furnace which can ensure the minimum temperature required even at a low power consumption.

본 발명의 상기한 목적은 소재인 빌레트를 이송시키면서 예열시킬 수 있도록 구성된 유도가열로의 소재이송장치에 있어서; 상기 소재가 통과되는 유도가열로의 로내 내화벽의 바닥면에 다수 형성된 반원형상의 설치홈과; 상기 소재의 바닥면과 구름접촉되도록 상기 설치홈에 유동가능하게 안치된 구형상의 이송볼을 포함하여 구성되는 것을 특징으로 하는 빌레트용 유도가열로의 소재이송장치를 제공함에 있다.The above object of the present invention is a material transfer apparatus for induction heating furnace configured to be preheated while transferring the billet is a material; Semi-circular installation grooves formed in the bottom surface of the furnace fire wall of the induction heating furnace through which the material passes; It is to provide a material transfer apparatus for billet induction heating furnace comprising a spherical conveying ball seated in the installation groove so as to be in contact with the bottom surface of the material to flow.

이하에서는, 첨부도면을 참조하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 소재이송장치의 설치상태를 보인 도 2b의 대비도면이고, 도 4는 본 발명 장치의 요부 다면 및 사시도이다.Figure 3 is a contrast view of Figure 2b showing the installation state of the material transfer apparatus according to the present invention, Figure 4 is a main face and perspective view of the device of the present invention.

도 3 및 도 4에 따르면, 로내 냉각관(10) 내부에 설치된 내화벽(12)의 바닥면에 반원형의 단면을 갖는 설치홈(19)이 형성된다.According to FIGS. 3 and 4, an installation groove 19 having a semicircular cross section is formed on the bottom surface of the fireproof wall 12 installed inside the furnace cooling tube 10.

상기 설치홈(19)은 소재(1)의 직선운동을 원활하게 안내하기 위해 두개를 연하여 형성함이 바람직하다.The installation groove 19 is preferably formed by connecting two in order to smoothly guide the linear motion of the material (1).

설치홈(19)에는 이송볼(18)이 안치된다.The transfer ball 18 is placed in the installation groove 19.

상기 이송볼(18)은 구형상의 것으로서 상기 설치홈(19) 내에서 구름가능하게 설치된다.The conveying ball 18 is spherical and is installed in a cloudable manner in the installation groove 19.

특히, 상기 이송볼(18)은 내열성을 갖고 최소한 상기 설치홈(19) 직경의 ⅔정도를 갖되 최대 상기 설치홈(19)의 직경정도의 직경을 갖도록 형성함이 바람직하다.In particular, the conveying ball 18 is preferably formed to have a heat resistance and at least about the diameter of the installation groove 19, the diameter of the maximum diameter of the installation groove 19.

이는 설치홈(19)과 이송볼(18) 사이의 구름 접촉성을 극대화시켜, 즉 설치홈(19) 내부에서 이송볼(18)이 원활한 유동성을 갖도록 하여 소재(1)의 이송능력을 향상시키기 위한 것이다. This maximizes the rolling contact between the installation groove 19 and the conveying ball 18, that is, the conveying ball 18 to have a smooth fluidity in the installation groove 19 to improve the conveying ability of the material (1) It is for.                     

이러한 구성으로 이루어진 본 발명은 다음과 같은 작동관계를 갖는다.The present invention made up of such a configuration has the following operational relationship.

먼저, 소재(1)가 소재장입기(5)에 의해 유도가열로(2,3,4) 내부로 이송될 때 소재(1)의 하면과 구름접촉되는 이송볼(18)이 배치되어 있으므로 소재(1)에 별도의 큰 외력이 가해지지 않더라도 아주 쉽게 장입시킬 수 있게 된다.First, when the material 1 is transferred into the induction heating furnaces 2, 3, and 4 by the material inserter 5, the transfer ball 18 is placed in contact with the lower surface of the material 1, so that the material (1) can be charged very easily even if no large external force is applied.

로 내부로 이송된 소재(1)는 이송볼(18)과 소재(1) 사이에서 면접촉이 아닌 점접촉을 하게 되므로 소재(1)의 단면에서의 온도편차가 현저히 줄어들게 된다.Since the material 1 transferred into the furnace is in point contact instead of surface contact between the transport ball 18 and the material 1, the temperature deviation in the cross section of the material 1 is significantly reduced.

즉, 기존과 같이 소재(1)의 하면이 이송수단과 거의 전면에 걸쳐 면접촉됨으로써 열이 쉽게 전도되어 쉽게 온도편차가 유발되던 것이 점접촉에 의해 열의 이동에 있어 제한을 받게 되므로 최소한의 온도편차를 보이게 되는 것이다.That is, since the lower surface of the material 1 is in surface contact with the transfer means almost over the entire surface, heat is easily conducted and temperature deviation is easily caused by the point contact, thereby limiting the movement of heat. Will be shown.

특히, 소재(1)의 길이 대비 대략 2개 1조의 이송볼(18)을 적어도 2조정도 소재(1)의 하면과 점접촉되게 배열함으로써 이송의 원활성 확보는 물론 소재의 열 손실을 줄여 온도편차를 최소화시키게 된다.In particular, by arranging approximately two sets of conveying balls 18 in at least two adjustment degrees in contact with the lower surface of the material 1 relative to the length of the material 1, the smoothness of the conveyance and the heat loss of the material can be reduced by reducing the temperature. Minimize the deviation.

이상에서 상세히 설명한 바와 같이, 본 발명은 다음과 같은 효과를 제공한다.As described in detail above, the present invention provides the following effects.

첫째, 종래의 소재 이송용 빔을 사용함으로써 문제가 되어 왔던 소재의 단면의 온도편차 발생문제를 저감시킴으로써 강관 제조시 발생하는 품질 불량률을 현저히 낮출 수 있다.First, by reducing the problem of temperature deviation of the cross section of the material, which has been a problem by using a conventional material transfer beam, it is possible to significantly lower the quality defect rate generated during steel pipe manufacturing.

둘째, 후공정과의 일치도를 증대시켜 가열로 처리 능력향상이 가능하며, 소재의 목표온도 저하의 문제가 해결됨에 따라 승온에너지의 절감을 꾀할 수 있다.Second, it is possible to improve the treatment capacity of the furnace by increasing the consistency with the post-process, and it is possible to reduce the temperature rise energy as the problem of lowering the target temperature of the material is solved.

Claims (2)

강관 소재(1)인 원형단면을 갖는 빌레트를 이송시키면서 예열시킬 수 있도록 구성된 유도가열로의 소재이송장치에 있어서;In the material transfer device to the induction heating furnace configured to be preheated while transferring the billet having a circular cross section which is a steel pipe material (1); 상기 소재(1)가 통과되는 유도가열로의 로내 내화벽(12)의 바닥면에 다수 형성된 반원형상의 설치홈(19)과;Semi-circular installation grooves 19 formed on the bottom surface of the furnace fire wall 12 of the induction heating furnace through which the material 1 passes; 상기 소재(1)의 바닥면과 구름접촉되도록 상기 설치홈(19)에 유동가능하게 안치된 구형상의 이송볼(18)을 포함하여 구성되는 것을 특징으로 하는 빌레트용 유도가열로의 소재이송장치.Material transfer apparatus for billet induction heating furnace characterized in that it comprises a spherical transfer ball (18) seated in the installation groove 19 so as to be in contact with the bottom surface of the material (1). 제1항에 있어서, 상기 이송볼(18)은 내열성을 갖고 최소 상기 설치홈(19) 직경의 ⅔에서 최대 상기 설치홈(19)의 직경에 해당하는 직경을 갖도록 형성되는 것을 특징으로 하는 빌레트용 유도가열로의 소재이송장치.The billet according to claim 1, wherein the conveying ball 18 has a heat resistance and is formed to have a diameter corresponding to the diameter of the installation groove 19 at a maximum of the diameter of the installation groove 19 at least. Material transfer device to induction furnace.
KR1020010062502A 2001-10-10 2001-10-10 Workpiece moving device for billets in induction heating furnace KR100807682B1 (en)

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