KR20010061653A - High carbon steel wire rolling mill with groove - Google Patents

High carbon steel wire rolling mill with groove Download PDF

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Publication number
KR20010061653A
KR20010061653A KR1019990064151A KR19990064151A KR20010061653A KR 20010061653 A KR20010061653 A KR 20010061653A KR 1019990064151 A KR1019990064151 A KR 1019990064151A KR 19990064151 A KR19990064151 A KR 19990064151A KR 20010061653 A KR20010061653 A KR 20010061653A
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South Korea
Prior art keywords
wire rod
carbon steel
stands
high carbon
rolling
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KR1019990064151A
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Korean (ko)
Inventor
이영석
최상우
이유완
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이구택
포항종합제철 주식회사
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Priority to KR1019990064151A priority Critical patent/KR20010061653A/en
Publication of KR20010061653A publication Critical patent/KR20010061653A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/42—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for step-by-step or planetary rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

PURPOSE: A high carbon steel wire rod rolling roll having grooves of final two stands is provided which improves roundness of a final product by manufacturing round type and oval type grooves of the final two stands compatibly to steel types during rolling of a high carbon steel material. CONSTITUTION: In a rolling roll having oval type and round type grooves of final two stands in the wire rod rolling process, the wire rod rolling roll is characterized in that a groove radius ratio (Rg/Rl) of the rolling roll having the oval type and round type grooves of the final two stands is 1.50 to 1.52. A wire rod product having superior ovality (standard: 5.5) is effectively manufactured when high carbon steel is produced by optimally setting a radius ratio of oval type and round type grooves of the final two stands of a finishing block mill in a wire rod plant.

Description

공형을 가지는 고탄소강 선재압연롤{High carbon steel wire rolling mill with groove}High carbon steel wire rolling mill with groove

본 발명은 고탄소강 선재의 강(鋼)종 특징을 고려하고, 최종 2개 스탠드의 타원형(Oval type) 공형의 반경비와, 원형(Round type) 공형의 반경비를 적절하게 설정하여 최종 제품의 편경차(Ovality)를 향상시킬 수 있는 공형을 가지는 고탄소강 선재압연롤에 관한 것이다.The present invention considers the characteristics of the steel type of the high carbon steel wire rod, and sets the radius ratio of the oval type ball and the round type ball of the final two stands as appropriate. The present invention relates to a high carbon steel wire rod rolling roll having a ball mold capable of improving the deviation.

일반적으로, 선재압연은 열간 상태에서 강편(Billet)을 수십 개의 압연스탠드를 연속적으로 거치면서 원하는 형상으로 만들어 내는 연속 압연공정이다.In general, wire rod rolling is a continuous rolling process that produces a desired shape while continuously passing dozens of rolling stands through a steel sheet in a hot state.

또한, 일반적인 판압연 공정과는 달리 각 스탠드(패스)별로 압연롤의 형상이 일정하지 않고 압연시 폭방향으로 소재의 유동이 허용된다.In addition, unlike the general sheet rolling process, the shape of the rolling roll is not constant for each stand (pass), and the flow of the material is allowed in the width direction during rolling.

여기서, 세계각국에서 주로 도입되어있는 일반적인 선재 압연에 사용되는 압연롤의 공형은 타원형-원형 (Oval type-Round type) 또는 정사각형-마름모형(Square type-Diamond type)이다.Here, the ball form of the rolling rolls used in general wire rod rolling, which are mainly introduced in the world, is an Oval type-Round type or a Square type-Diamond type.

이는 강편(Billet)이 가열로에서 나와 1번 스탠드의 상자형(Box type)의 압연롤에 첫 압연되고, 그 다음에 2번 스탠드의 타원형(Oval type) 패스에서 압연되며, 3번 스탠드의 원형(Round type)패스에서 압연되고, 그 후에는 타원형-원형(Oval type-Round type) 패스가 반복되면서 최종제품 크기(size)별로 다른 수의 스탠드를 거치면서 원하는 단면 크기의 선재제품을 생산하게 된다.This is because the Billet exits the furnace and is first rolled on a box-type rolling roll on stand # 1, then on an oval type pass on stand # 2, and on the round of stand # 3. It is rolled in a round type pass, after which an oval type-round type pass is repeated to produce wire rods of the desired cross-sectional size, passing through a different number of stands for each end product size. .

도면에서, 도1은 상자형공형(box groove)을 가지는 상하부 선재압연롤의 개략도이고, 도2는 타원형공형(oval groove)을 가지는 선재압연롤의 개략도이며, 도3은 원형공형(round groove)을 가지는 선재압연롤의 개략도이다.In the drawings, FIG. 1 is a schematic diagram of a top and bottom wire rod roll having a box groove, FIG. 2 is a schematic diagram of a wire roll roll having an oval groove, and FIG. 3 is a round groove. Schematic diagram of the wire rod roll having a.

도1 내지 도3에서는, 상하부 선재압연롤(1, 2)에 의해 형성되는 상자형(Boxtype)공형(3a), 타원형(Oval type)공형(3b) 그리고 원형(Round type)공형(3c)의 설정변수(Design Parameter)를 나타내고 있는 바, 선재 제품의 품질을 평가할 때 크게 소재재질과 소재형상으로 나누어서 평가하고 있다.In Figs. 1 to 3, the box type balls 3a, the oval type balls 3b and the round type balls 3c formed by the upper and lower wire rolling rolls 1 and 2 are formed. Design Parameter is shown, and when evaluating the quality of wire rod products, it is divided into materials and shape.

소재형상 평가방법으로 소재의 편경차(Ovality)를 사용하고 있는데, 이는 소재단면이 진원도(Roundness)에 얼마만큼 가까우냐에 따라 평가된다.Ovality of the material is used as a method for evaluating the shape of the material, which is evaluated according to how close the material section is to roundness.

즉, 편경차가 작을수록 소재단면형상이 진원에 가까운 우수한 선재제품이 되는 바, 상기한 편경차(Ovality)는 최종제품 단면의 단축길이와 장축길이와의 차이를 말한다.In other words, the smaller the difference in diameter, the more the cross-sectional shape of the material becomes an excellent wire rod product, and the above-mentioned deviation means the difference between the short axis length and the long axis length of the end product cross section.

현재의 압연공정에서는 최종 2개 패스에 타원형과 원형공형의 압연롤이 있고, 선재 압연공정을 설계할 때, 일반적으로 중탄소강(0.45wt%C)을 기준으로 설정되어 있다.In the present rolling process, there are elliptical and circular ball rolling rolls in the final two passes, and when designing the wire rod rolling process, it is generally set based on medium carbon steel (0.45 wt% C).

그래서, 자동차 타이어용 직경 5.5mm의 POSCORD80S("대한민국 포스코사"에서 생산하는 고탄소강 중에 한 제품)와 같은 고탄소강(0.80wt%C)을 압연할 때는 제품의 편경차가 나빠지고 있다.Therefore, when rolling high carbon steel (0.80 wt% C), such as POSCORD80S (a product of high carbon steel produced by "POSCO Korea") with a diameter of 5.5 mm for automobile tires, the deviation of the product is worsening.

즉, 강종의 특성에 맞게 최종 2개 스탠드의 타원형 및 원형공형의 설정변수를 적절히 변화시키지 않음으로써, 고탄소강의 압연 제품 편경차가 나빠지는 것이다.That is, by varying the setting parameters of the elliptical and circular holes of the last two stands according to the characteristics of the steel grade, the deviation of the rolled products of high carbon steel becomes worse.

여기서, 선재 제품의 편경차는 최종 2개 스탠드의 타원형과 원형공형의 설정방법에 따라 좌우된다.Here, the deviation of the wire rod product depends on the setting method of the elliptical and circular hole of the last two stands.

기존의 압연방법에서는 고탄소강 생산시에도 중탄소강(0.45wt%C)생산할 때사용되는 공형을 그대로 사용하여 단지 타원형공형의 롤갭(Roll Gap)을 변화시키면서 다음스탠드의 원형공형에서 편경차감소를 시도하고 있다.In the existing rolling method, even in the production of high carbon steel, it uses the same ball mold used for the production of medium carbon steel (0.45wt% C) as it is, and changes the roll gap of the elliptical ball shape while attempting to reduce the deviation in the circular ball shape of the next stand. Doing.

그러나, 이 방법은 강종의 특성을 고려하지 않은 채 진원도 향상을 도모하기 때문에, 근본적인 대책이 되지 않을 뿐만 아니라 진원도 향상에 한계가 있고, 진원에 근접되도록 압연 제품을 제작하는데 거의 불가능하게 되는 문제점이 있다.However, since this method aims to improve roundness without considering the characteristics of steel grades, it is not a fundamental countermeasure, it has a limitation in improving roundness, and there is a problem that it is almost impossible to manufacture a rolled product so as to be close to the roundness. .

본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로서, 고탄소강 소재의 압연 시 최종 2개 스탠드의 원형 및 타원형공형을 강종에 적합하도록 제작하여, 최종 제품의 진원도를 향상시킬 수 있는 최종 2개 스탠드의 공형을 가지는 고탄소강 선재압연롤을 제공하는 데 그 목적이 있다.An object of the present invention is to solve the above problems, by manufacturing a round and elliptical mold of the last two stands when rolling high carbon steel material suitable for steel grade, the last two stands that can improve the roundness of the final product The purpose is to provide a high carbon steel wire rod roll having a ball form of.

도1은 상자형공형(box groove)을 가지는 선재압연롤의 개략도이고,1 is a schematic view of a wire rod rolling roll having a box groove;

도2는 타원형공형(oval groove)을 가지는 선재압연롤의 개략도이고,Figure 2 is a schematic diagram of the wire rod roll having an oval groove (oval groove),

도3은 원형공형(round groove)을 가지는 선재압연롤의 개략도이고,3 is a schematic diagram of a wire rod rolling roll having a round groove;

도4는 선재가 타원형-원형공형을 가지는 선재압연롤에 의해 압연되는 과정을 나타낸 개략도이고,4 is a schematic view showing a process in which the wire rod is rolled by a wire rod roll having an elliptical-circular hole;

도5는 단순압축시험에서 마찰계수가 소재의 폭방향으로의 연신 및 형상에 미치는 영향을 도시한 개념도이며,5 is a conceptual diagram showing the effect of the friction coefficient on the stretching and shape of the material in the width direction in a simple compression test,

도6은 타원형공형과 원형공형의 설정변수와 곡률반경비 변화를 도시한 개략도이다.Figure 6 is a schematic diagram showing the change of the set parameters and the radius of curvature ratio of the elliptical ball and the circular ball.

♠도면의 주요부분에 대한 부호의 설명♠♠ Explanation of symbols on the main parts of the drawings.

1 : 상부 선재압연롤 2 : 하부 선재압연롤1: upper wire rod roll 2: lower wire rod roll

3 : 공형 4 : 압연되는 선재3: ball type 4: wire rod to be rolled

앞서 설명한 바와 같은 목적을 달성하기 위한 본 발명에 따르면, 선재 압연공정에서 최종 2개 스탠드의 타원형 및 원형공형을 가지는 압연롤에 있어서, 상기 최종 2개 스탠드의 타원 및 원형공형을 가지는 압연롤의 공형반경비(Rg/R1)가 1.50~1.52인 것을 특징으로 하는 선재압연롤이 제공된다.According to the present invention for achieving the object as described above, in the rolling roll having the elliptical and circular ball of the last two stands in the wire rod rolling process, the ball of the rolling roll having an ellipse and the circular ball of the last two stands Wire rod rolling is provided, characterized in that the radius ratio (Rg / R1) is 1.50 ~ 1.52.

아래에서, 본 발명에 따른 공형을 가지는 고탄소강 선재압연롤을 첨부한 도면을 참조로 하여 상세히 설명하겠다.In the following, with reference to the accompanying drawings, a high carbon steel wire rod roll having a ball mold according to the present invention will be described in detail.

도면에서, 도4는 선재가 타원형-원형공형을 가지는 선재압연롤에 의해 압연되는 과정을 나타낸 개략도이고, 도5는 단순압축시험에서 마찰계수가 소재의 폭방향으로의 연신 및 형상에 미치는 영향을 도시한 개념도이며, 도6은 타원형공형과원형공형의 설정변수와 곡률반경비 변화를 도시한 개략도이다.In the figure, Figure 4 is a schematic diagram showing a process in which the wire is rolled by a wire rolling roll having an elliptical-circular hole, Figure 5 shows the effect of the friction coefficient on the stretching and shape of the material in the width direction in a simple compression test FIG. 6 is a schematic diagram showing a change in the set parameters and the curvature radius ratios of elliptical and circular holes.

도4의 (a)는 도시된 바와 같이, 타원형 선재소재(4)가 원형공형(3c)에 처음 진입되는 모습이고, 도4의 (b)는 선재소재(4)가 원형공형(3c)에서 나오는 모양을 나타내었다.As shown in FIG. 4A, the oval wire rod 4 enters the circular hole 3c for the first time, and FIG. 4B shows the wire rod 4 in the circular hole 3c. The appearance is shown.

도4에 도시된 상하부 선재압연롤(1, 2)의 공형(3c)이 최종 두 스탠드의 압연공정이라면 타원형 선재소재의 곡률 반경비(ρoval)와 원형공형의 반경비(Rg)와는 아주 밀접한 관계가 있다.If the ball 3c of the upper and lower wire rolls 1 and 2 shown in FIG . There is.

즉, 최종제품의 진원도는 공형반경비(Rg/ρoval)를 어떻게 하는가에 따라 크게 좌우된다고 할 수 있다.In other words, the roundness of the final product is highly dependent on how the Rg / ρoval.

한편, 강종에 따라서 공형을 가지는 롤과 압연 선재소재(4)의 마찰계수가 틀리기 때문에 선재소재(4)의 최대폭퍼짐(maximum spread) 및 소재형상이 다르게 된다.On the other hand, since the friction coefficient between the roll having a ball shape and the rolled wire rod material 4 is different according to the steel type, the maximum spread and material shape of the wire rod material 4 are different.

이는 도5에 도시된 바와 같이, 공형 압연을 판압연으로 근사화 시켜 해석할 수 있고 이를 다시 단순압축으로 근사화시킬 수 있다.This can be interpreted by approximating the ball rolling as plate rolling, as shown in FIG. 5, and can be approximated by simple compression again.

압연 시에 마찰계수(Cf)가 클수록 선재소재(4)의 최대폭퍼짐이 증가되고 자유표면의 곡률반경이 작아지게 된다. 그러므로, 고탄소강과 일반 중탄소강(0.45wt%C)생산 시에, 공형 표면과의 마찰계수는 서로 틀리므로 최종스탠드의 원형공형에서 압연되는 선재소재(4)의 자유표면의 곡률반경이 고탄소강 경우와 일반 중탄소강(0.45wt%C)경우는 다르게 된다.As the coefficient of friction Cf increases during rolling, the maximum width spread of the wire rod 4 increases and the radius of curvature of the free surface decreases. Therefore, in the production of high carbon steel and ordinary medium carbon steel (0.45wt% C), the coefficient of friction with the surface of the ball is different from each other, so that the radius of curvature of the free surface of the wire rod material 4 rolled in the circular shape of the final stand is high carbon steel. The case is different from that of ordinary medium carbon steel (0.45 wt% C).

그러므로, 일반 중탄소강(0.45wt%C) 생산공정(pass schedule)에서선재소재(4)의 진원도가 좋지만, 똑같은 생산공정(pass schedule)으로 고탄소강을 생산하면 선재소재(4)의 진원도가 나빠지게 된다.Therefore, roundness of wire rod material 4 is good in general medium carbon steel (0.45wt% C) pass schedule, but when high carbon steel is produced in the same pass schedule, roundness of wire rod material 4 is obtained. Will fall out.

도6에서 도시된 바와 같이, 타원형공형의 곡률반경을 기존의 것을 기준으로 크게 또는 작게 하면서 열간 공형 압연실험을 하였다.As shown in FIG. 6, the hot ball rolling experiment was performed while the radius of curvature of the elliptical ball was increased or decreased based on the existing one.

여기서, 타원형공형의 곡률반경(R1)은 도4의 (a)에 도시된 타원형 선재소재(4)의 곡률 반경비(ρoval)와 같고, 두 공형의 곡률반경비(Rg/R1)가 1.505(=8.28/5.5)가 될 때, 편경차가 기존의 것 보다 30%이상 향상된다.Here, the radius of curvature R1 of the elliptical ball shape is equal to the radius of curvature of the elliptical wire rod material 4 shown in FIG. 4 (a), and the radius of curvature of the two balls (Rg / R1) is 1.505 ( = 8.28 / 5.5), the deviation is more than 30% better than the existing one.

이는 표1에 나타난 바와 같이, 타원 및 원형공형의 곡률반경비와 편경차와의 관계를 나타내는 바, 참고적으로 일반 중탄소강(0.45wt%C) 생산공정용 타원 및 원형공형의 곡률반경비는 1.455이다.As shown in Table 1, this shows the relationship between the radius of curvature of the ellipse and the circular hole and the deflection difference.For reference, the radius of curvature of the ellipse and the circular hole for the production process of general medium carbon steel (0.45wt% C) is 1.455.

Rg[mm]/R1[mm]Rg [mm] / R1 [mm] 편경차[mm]Deviation diameter [mm] 8.0/5.58.0 / 5.5 0.230.23 8.3/5.58.3 / 5.5 0.160.16

이상과 같이 본 발명은, 선재공장 사상압연기(finishing block mill)의 마지막 두개 스탠드의 타원형과 원형 공형반경비를 최적으로 설정하여 고탄소강을 생산하면 편경차(5.5 기준)가 우수한 선재제품을 생산하는데 효과가 있다.As described above, the present invention produces the wire rod product having excellent deviation (5.5 standard) when high carbon steel is produced by optimally setting the elliptical and circular ball radius ratios of the last two stands of the finishing block mill of the wire rod factory. It works.

Claims (1)

선재 압연공정에서 최종 2개 스탠드의 타원형 및 원형공형을 가지는 압연롤에 있어서,In the rolling roll having elliptical and circular hole of the last two stands in the wire rod rolling process, 상기 최종 2개 스탠드의 타원 및 원형공형을 가지는 압연롤의 공형반경비(Rg/R1)가 1.50~1.52인 것을 특징으로 하는 선재압연롤.Wire radius roll (Rg / R1) of the rolling roll having the ellipse and the circular ball of the last two stands is 1.50 ~ 1.52.
KR1019990064151A 1999-12-28 1999-12-28 High carbon steel wire rolling mill with groove KR20010061653A (en)

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KR20030053809A (en) * 2001-12-24 2003-07-02 주식회사 포스코 Rod rolling apparatus for improving the roundness of tirecord
KR100797245B1 (en) * 2006-12-22 2008-01-23 주식회사 포스코 Method for manufacturing rod rolling roll
CN104646414A (en) * 2015-03-20 2015-05-27 天津市金桥焊材集团有限公司 Circular-section solid metal wire reduced-diameter compression roll
CN104707866A (en) * 2014-12-24 2015-06-17 内蒙古包钢钢联股份有限公司 Method for producing phi22 steel wire rod through Morgan fifth-generation high speed wire rod mill
CN106001118A (en) * 2016-05-16 2016-10-12 西宁特殊钢股份有限公司 Hole-shaped structure of phi-65-mm bar and rolling method thereof
CN108620437A (en) * 2018-07-12 2018-10-09 南京钢铁股份有限公司 A kind of pass and its construction method of hot rolled circular steel

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JPS55144302A (en) * 1979-05-01 1980-11-11 Kawasaki Steel Corp Production of round bar
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030053809A (en) * 2001-12-24 2003-07-02 주식회사 포스코 Rod rolling apparatus for improving the roundness of tirecord
KR100797245B1 (en) * 2006-12-22 2008-01-23 주식회사 포스코 Method for manufacturing rod rolling roll
CN104707866A (en) * 2014-12-24 2015-06-17 内蒙古包钢钢联股份有限公司 Method for producing phi22 steel wire rod through Morgan fifth-generation high speed wire rod mill
CN104646414A (en) * 2015-03-20 2015-05-27 天津市金桥焊材集团有限公司 Circular-section solid metal wire reduced-diameter compression roll
CN106001118A (en) * 2016-05-16 2016-10-12 西宁特殊钢股份有限公司 Hole-shaped structure of phi-65-mm bar and rolling method thereof
CN108620437A (en) * 2018-07-12 2018-10-09 南京钢铁股份有限公司 A kind of pass and its construction method of hot rolled circular steel
CN108620437B (en) * 2018-07-12 2024-04-16 南京钢铁股份有限公司 Pass of hot rolled round steel and construction method thereof

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