KR960021202A - How to set operation roll replacement cycle of hot rolling mill - Google Patents

How to set operation roll replacement cycle of hot rolling mill Download PDF

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Publication number
KR960021202A
KR960021202A KR1019940034285A KR19940034285A KR960021202A KR 960021202 A KR960021202 A KR 960021202A KR 1019940034285 A KR1019940034285 A KR 1019940034285A KR 19940034285 A KR19940034285 A KR 19940034285A KR 960021202 A KR960021202 A KR 960021202A
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South Korea
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roll
rolling
allowable
hot
surface roughness
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KR1019940034285A
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Korean (ko)
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KR970010775B1 (en
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유재화
박종일
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김만제
포항종합제철 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Abstract

본 발명은 열간압연에서의 마무리 압연기의 작동롤 교체주기를 설정하는 방법에 관한 것으로써, 열간압연중에 마무리압연기의 작동롤에 가해지는 열적, 기계적 손상의 정량화를 통해 작동롤의 교체주기를 설정하므로써, 열연강판의 표면품질, 생산성 및 롤원단위를 향상시킬 수 있는 열간압연 마무리압연기의 작동롤 교체주기 설정방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method for setting an operation roll replacement cycle of a finishing rolling mill in hot rolling, and by setting a replacement cycle of an operation roll through quantification of thermal and mechanical damage applied to the operation roll of the finishing rolling mill during hot rolling. In order to improve the surface quality, productivity and roll unit of hot rolled steel sheet, the purpose of the present invention is to provide a method for setting a rolling roll replacement cycle of a hot rolling mill.

본 발명은 열간압연 마무리압연기의 작동롤에 가해지는 피로손상량(FD)을 하기식과 같이 구하는 단계;The present invention is to obtain the fatigue damage (FD) applied to the operation roll of the hot rolling finish rolling mill as shown in the following formula;

(여기서, m: 작동롤 교체시까지 압연되는 압연매수,σRi:i번째 압연되는 열연강판 1매 압연시의 압연응력, Ni:i번째 압연되는 열연강판 1매 압연시의 작동롤 회전수, C:피로인성지수,σci:i번재 압연되는 열연강판 1매 압연시의 작동롤과 지지롤 사이의 최대접촉응력, b:파단 응력지수)작동롤의 표면거침 정도와 열연강판의 표면결함 발생량과의 상관성으로부터 허용되는 표면결함 발생량에 상응하는 허용 표면거첨정도를 구하는 단계; 상기와 같이 구한 피로손상량(FD)과 작동롤의 표면 거침정도와의 상관성을 구하는 단계; 상기와 같이 구한 상관성으로부터 허용 표면 거침정도에 상응하는 허용피로 손상량(FD)를 구하는 단계; 및 상기와 같이 구한 허용 피로 손상량(FD)을 상기 식에 대입하여 압연매수(m)를 구하는 단계; 및 상기와 같인 구한 압연매수(m)에 의해 작동롤의 교체주기를 설정하는 단계를 포함하여 구성되는 열간압연 마무리 압연기의 작동롤 교체 주기 설정방법을 그 요지로 한다.Where m is the number of rolling rolls rolled until the replacement of the working roll, σ Ri: rolling stress at the time of rolling the first hot rolled steel sheet rolled at the i th roll, and nir. C: Fatigue toughness index, σ ci: i Maximum rolling stress between operating roll and supporting roll when rolling one sheet of hot rolled steel sheet, b: Breaking stress index) Surface roughness of operating roll and surface defect occurrence amount of hot rolled steel sheet Obtaining a degree of allowable surface erosion corresponding to the allowable amount of surface defect occurrence from correlation with; Obtaining a correlation between the fatigue damage (FD) obtained as described above and the surface roughness of the operation roll; Obtaining the allowable fatigue damage (FD) corresponding to the allowable surface roughness from the correlation obtained as described above; And calculating the number of rolls (m) by substituting the allowable fatigue damage amount (FD) obtained as described above into the above formula; And a method for setting an operation roll replacement cycle of the hot rolling finish rolling mill comprising the step of setting an operation cycle for the operation roll by the obtained number of rolls (m) as described above.

Description

열간압연 마무리 압연기의 작동롤 교체주기 설정방법How to set operation roll replacement cycle of hot rolling mill

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 통상적인 4단 마무리 압연기의 구성도.1 is a block diagram of a conventional four-stage finishing mill.

Claims (2)

열간압연 마무리압연기의 작동롤에 가해지는 피로손상량(FD)을 하기식과 같이 구하는 단계;Obtaining a fatigue damage amount (FD) applied to the operation roll of the hot rolling finish mill as in the following formula; (여기서, m: 작동롤 교체시까지 압연되는 압연매수,σRi:i번째 압연되는 열연강판 1매 압연시의 압연응력, Ni:i번째 압연되는 열연강판 1매 압연시의 작동롤 회전수, C:피로인성지수,σci:i번재 압연되는 열연강판 1매 압연시의 작동롤과 지지롤 사이의 최대접촉응력, b:파단 응력지수)작동롤의 표면거침 정도와 열연강판의 표면결함 발생량과의 상관성으로부터 허용되는 표면결함 발생량에 상응하는 허용 표면거첨정도를 구하는 단계; 상기와 같이 구한 피로손상량(FD)과 작동롤의 표면 거침정도와의 상관성을 구하는 단계; 상기와 같이 구한 상관성으로부터 허용 표면 거침정도에 상응하는 허용피로 손상량(FD)를 구하는 단계; 및 상기와 같이 구한 허용 피로 손상량(FD)을 상기 식에 대입하여 압연매수(m)를 구하는 단계; 및 상기와 같인 구한 압연매수(m)에 의해 작동롤의 교체주기를 설정하는 단계를 포함하여 구성되는 열간압연 마무리 압연기의 작동롤 교체 주기 설정방법.Where m is the number of rolling rolls rolled until the replacement of the working roll, σ Ri: rolling stress at the time of rolling the first hot rolled steel sheet rolled at the i th roll, and nir. C: Fatigue toughness index, σ ci: i Maximum rolling stress between operating roll and supporting roll when rolling one sheet of hot rolled steel sheet, b: Breaking stress index) Surface roughness of operating roll and surface defect occurrence amount of hot rolled steel sheet Obtaining a degree of allowable surface erosion corresponding to the allowable amount of surface defect occurrence from correlation with; Obtaining a correlation between the fatigue damage (FD) obtained as described above and the surface roughness of the operation roll; Obtaining the allowable fatigue damage (FD) corresponding to the allowable surface roughness from the correlation obtained as described above; And calculating the number of rolls (m) by substituting the allowable fatigue damage amount (FD) obtained as described above into the above formula; And setting the replacement cycle of the operation roll by the obtained number of rolls (m) as described above. 제1항에 있어서, 상기 작동롤의 재질이 피로인성지수(c)가 0.7이고, 파단응력지수(b)가 0.11인 고크롬주철이고; 상기 작동롤이 2번째 작동롤이고; 그리고 상기 허용 표면거침정도가 유성홈의 깊이가 얕고 소량존재할때의 표면거침 정도인 것을 특징으로 하는 열간압연마무리 압연기의 작동롤 교체주기 설정방법.The material of the operating roll is high chromium cast iron having a fatigue toughness index (c) of 0.7 and a fracture stress index (b) of 0.11; The operation roll is the second operation roll; And the permissible surface roughness is a surface roughness when the depth of the planetary groove is shallow and a small amount is present. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940034285A 1994-12-14 1994-12-14 Method of change rolling mill roll KR970010775B1 (en)

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KR970010775B1 KR970010775B1 (en) 1997-07-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100775325B1 (en) * 2001-12-26 2007-11-08 주식회사 포스코 How to set the replacement cycle of hot rolling rolls

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100775325B1 (en) * 2001-12-26 2007-11-08 주식회사 포스코 How to set the replacement cycle of hot rolling rolls

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