KR102313889B1 - Deformed reinforcing bar manufacturing method by rolling - Google Patents
Deformed reinforcing bar manufacturing method by rolling Download PDFInfo
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- KR102313889B1 KR102313889B1 KR1020210032335A KR20210032335A KR102313889B1 KR 102313889 B1 KR102313889 B1 KR 102313889B1 KR 1020210032335 A KR1020210032335 A KR 1020210032335A KR 20210032335 A KR20210032335 A KR 20210032335A KR 102313889 B1 KR102313889 B1 KR 102313889B1
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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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
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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
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- 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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- 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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Abstract
Description
본발명은 압연에 의한 이형철근제조방법에 관한 것으로, 보다 상세하게는 빌렛을 압연하여 정확한 치수로 품질이 우수한 이형철근을 빠른 시간내에 제조하며 경제적인 압연에 의한 이형철근제조방법에 관한 것이다.The present invention relates to a method for manufacturing deformed reinforcing bars by rolling, and more particularly, to a method for manufacturing deformed reinforcing bars by rolling billets to produce high-quality deformed reinforcing bars with accurate dimensions in a short time, and to an economical method for manufacturing deformed reinforcing bars by rolling.
일반적으로 이형철근은 공개특허공보 공개번호 10-2011-0034482호에 배경기술로 기재된 바와 같이, 압연기에서는 압연롤이 서로 마주보는 방향으로 회전하면서 압연소재에 힘을 가해 연속적으로 압연을 수행하게 된다.In general, the deformed reinforcing bar is continuously rolled by applying a force to the rolling material while rotating the rolling rolls in a direction facing each other in the rolling mill, as described in the background art in Laid-Open Patent Publication No. 10-2011-0034482 No. 10-2011-0034482.
상기 마디는 이형철근의 표면에 원주방향을 따라 형성된 돌출띠 형태이고, 리브는 이형철근의 표면에 길이방향을 따라 형성된 돌출띠로서, 압연롤의 표면에 가공되어 형성된 오목띠홈의 내면형상에 따라 압연시에 형성된다.The node is in the form of a protruding band formed along the circumferential direction on the surface of the deformed reinforcing bar, and the rib is a protruding band formed along the longitudinal direction on the surface of the deformed reinforcing bar. formed at the time
또한 상기 공개특허공보 공개번호 10-2011-0034482호에는 표면에 길이방향을 따라 복수 줄의 리브가 형성되고, 상기 복수 줄의 리브 사이에 원주방향을 따라 마디가 형성되되, 상기 리브 사이에 형성된 마디는 상기 일측 리브에서 서서히 높아지거나 넓어지다가 중간에서 최고에 이른 후 서서히 낮아지거나 좁아져서 타측 리브에 이르는 형상으로 형성된 것을 특징으로 하는 이형철근이 공개되어 있다.In addition, in the Laid-Open Patent Publication No. 10-2011-0034482, a plurality of rows of ribs are formed on the surface in the longitudinal direction, and nodes are formed along the circumferential direction between the plurality of rows of ribs, and the nodes formed between the ribs are A deformed reinforcing bar is disclosed, characterized in that it gradually rises or widens from the one side rib, and then gradually lowers or narrows after reaching the highest in the middle, and is formed in a shape reaching the other side rib.
또한 공개번호 10-2013-0013656에는 압연롤의 공형 내측면에 이형철근의 마디에 해당되는 부분을 가공하는 압연롤용 이형 철근의 마디 가공장치에 있어서, 상기 압연롤과 상기 마디를 가공하는 바이트가 장착된 바이트홀더에 양극이 접속된 전원과, 상기 압연롤과 바이트홀더 및 상기 전원을 포함하는 전기회로의 통전 여부를 감지하는 통전감지센서와, 상기 통전감지센서로부터In addition, in Publication No. 10-2013-0013656, in the knurl processing apparatus of the deformed reinforcing bar for a rolling roll that processes the part corresponding to the knurl of the deformed reinforcing bar on the inner surface of the ball type of the rolling roll, the rolling roll and the bite for processing the knurl are mounted A power supply having a positive pole connected to the bite holder, a energization sensor for detecting whether an electric circuit including the rolling roll, the bite holder, and the power is energized, and from the energization sensor
통전신호를 전달받는 전자제어유니트와, 상기 통전신호 발생시 상기 전자제어유니트에 의해 작동되는 알림장치를 더 포함하는 것을 특징으로 하는 압연롤용 이형 철근의 마디 가공장치가 공개되어 있다.An electronic control unit for receiving an energization signal, and a node processing apparatus for deformed rebar for a rolling roll, characterized in that it further comprises a notification device operated by the electronic control unit when the energization signal is generated.
그러나 상기 종래기술들은 빌렛을 압연시 치수가 부정확해지기 쉽고, 성질이 변형되어 품질이 저하되는 우려가 있으며 제조속도가 느려 비경제적인 문제점이 있다.However, in the prior art, when the billet is rolled, the dimensions are likely to be inaccurate, the properties are deformed, and there is a concern that the quality is deteriorated, and the manufacturing speed is slow, which is uneconomical.
따라서 본발명은 상기와 같은 문제점을 해결하고자 안출된 것으로, 빌렛을 압연하여 정확한 치수로 품질이 우수한 이형철근을 빠른 시간내에 제조하며 경제적인 압연에 의한 이형철근제조방법을 제공하고자 하는 것이다.Therefore, the present invention has been devised to solve the above problems, and it is to provide a method for manufacturing deformed reinforcing bars by rolling a billet to produce high-quality deformed reinforcing bars with accurate dimensions in a short time and by rolling them economically.
본발명은 압연에 의한 이형철근제조방법에 관한 것으로, 빌렛을 압연기에 장입한후, 가열공정을 거치며 압연된 이형철근을 수냉열처리하여 제조하는 것을 특징으로 한다.The present invention relates to a method for manufacturing deformed reinforcing bars by rolling, characterized in that a billet is charged into a rolling mill, and then the deformed rebars rolled through a heating process are water-cooled and heat-treated to manufacture.
따라서 본발명은 빌렛을 압연하여 정확한 치수로 품질이 우수한 이형철근을 빠른 시간내에 제조하며 경제적인 현저한 효과가 있다.Therefore, the present invention produces a deformed reinforcing bar of excellent quality with accurate dimensions by rolling a billet in a short time, and there is a significant economic effect.
도 1은 본발명의 압연에 의한 이형철근제조방법 공정도
도 2는 철근 제조공장의 기본 레이아웃도
도 3은 최종 PASS에서의 철근으로 압연되는 모식도
도 4는 본발명의 압연에 의한 이형철근제조방법에서의 일반적인 공정 흐름도
도 5는 본발명의 압연에서의 슬리트 원리도
도 6은 본발명의 압연기를 통과하면서 분리되는 슬리트 과정도
도 7은 종래 압연 PASS도면
도 8은 본발명의 2 SLIT 조업 PASS도면1 is a process diagram of a method for manufacturing a deformed reinforcing bar by rolling of the present invention;
2 is a basic layout diagram of a rebar manufacturing plant
3 is a schematic view of rolling with reinforcing bars in the final PASS
4 is a general process flow diagram in the method for manufacturing a deformed reinforcing bar by rolling of the present invention;
5 is a slit principle diagram in rolling of the present invention;
Figure 6 is a slit process that is separated while passing through the rolling mill of the present invention
7 is a conventional rolling PASS diagram
8 is a 2 SLIT operation PASS diagram of the present invention
본발명은 압연에 의한 이형철근제조방법에 관한 것으로, 빌렛을 압연기에 장입한후, 가열공정을 거친 철근을 수냉열처리하여 제조하는 것을 특징으로 한다.The present invention relates to a method for manufacturing deformed reinforcing bars by rolling, characterized in that the reinforcing bars that have undergone a heating process are manufactured by water-cooling heat treatment after a billet is charged into a rolling mill.
또한, 상기 빌렛을 가열공정을 거쳐 연속 압연기를 통과하면서 특정 SLIT PASS에서 단열 압연재을 복열 분할 압연으로 변경하는 연속 압연하는 특징으로 한다.In addition, it is characterized in that the billet passes through a continuous rolling mill through a heating process, and continuous rolling is performed to change the insulating rolled material to double-row split rolling in a specific SLIT PASS.
본발명을 첨부도면에 의해 상세히 설명하면 다음과 같다. 도 1은 본발명의 압연에 의한 철근제조방법 공정도, 도 2는 철근 제조공장의 기본 레이아웃도, 도 3은 최종 PASS에서의 철근으로 압연되는 모식도, 도 4는 본발명의 압연에 의한 이형철근제조방법에서의 일반적인 공정 흐름도, 도 5는 본발명의 압연에서의 슬리트 원리도, 도 6은 본발명의 압연기를 통과하면서 분리되는 슬리트 과정도, 도 7은 종래 압연 PASS도면, 도 8은 본발명의 2 SLIT 조업 PASS도면이다.The present invention will be described in detail with reference to the accompanying drawings as follows. 1 is a process diagram of a rebar manufacturing method by rolling of the present invention, FIG. 2 is a basic layout diagram of a rebar manufacturing plant, FIG. 3 is a schematic diagram of rolling reinforcing bars in the final PASS, FIG. 4 is a deformed rebar by rolling of the present invention A general process flow chart in the manufacturing method, FIG. 5 is a slit principle diagram in rolling of the present invention, FIG. 6 is a slit process that is separated while passing through the rolling mill of the present invention, FIG. 7 is a conventional rolling PASS diagram, FIG. 8 is It is a drawing of 2 SLIT operation PASS of the present invention.
본발명의 철근을 압연방식으로 제조하기 위해 빌렛을 사용하며, 압연 사용 BILLET규격은 치수 150×150×10, 400L, 중량 1,853Kg/본이다.A billet is used to manufacture the reinforcing bar of the present invention by a rolling method, and the rolling billet standard is 150×150×10, 400L, and weight 1,853Kg/bone.
BILLET의 화학성분은 성분비율은 C28~30중량부에 대하여, Si 14~20, Mn 50~60, 중량부이다.The chemical composition of BILLET is 14-20 parts by weight of Si, 50-60 parts by weight of Mn, based on 28-30 parts by weight of C28.
철근제조를 위한 관용의 압연기를 사용하며, BILLET 가열온도는 장입 온도 : 상온~780℃, 가열 및 추출온도 : 1,030~1,100℃이다. 냉각은 수냉 또는 열간 압연 후 대기 중 자연 냉각방식을 채택한다.A conventional rolling mill is used for manufacturing rebar, and the heating temperature of the billet is: charging temperature: room temperature to 780℃, and heating and extraction temperature: 1,030 to 1,100℃. Cooling adopts natural cooling method in the air after water cooling or hot rolling.
생산규격은 실시례에서 이형봉강(철근) D10~D57 중 D22이다. 생산강종은The production standard is D22 among the deformed bars (reinforcing bars) D10 to D57 in the example. The produced steel
KS D 3504 기준 SD300~SD700 이다.It is SD300~SD700 based on KS D 3504.
압연 중 온도 변화를 구체적으로 기재하면, BILLET 추출온도 1,050℃ → 압연 FINAL PASS 980℃~1,020℃ → 수냉 열처리 후 온도 4~600℃ 내외 → 제품 냉각 (공냉)의 처리단계로 단일 연속공정으로 이루어진다.If the temperature change during rolling is described in detail, BILLET extraction temperature 1,050℃ → Rolling FINAL PASS 980℃~1,020℃ → After water cooling heat treatment, the temperature is around 4~600℃ → Product cooling (air cooling) is a single continuous process.
압연 시간에 대해 설명하면, 압연 조업기준에 의한 ROLL 회전수에 따라 각 PASS별 선속을 제어가 가능하다. 압연속도는 최종 PASS 기준하면, 최고 16.5m/sec 및 BILLET 추출 PITCH TIME은 35초~45초이다. 동일 BILLET 사용하여 압연 규격별 PASS-SCHEDULE에 의한 압연 및 수냉 열처리를 통해 SD300~SD700외 강종 생산을 하게 되는 것이다.As for the rolling time, it is possible to control the line speed for each pass according to the number of rotations of the roll according to the rolling operation standard. The rolling speed is based on the final pass, the maximum is 16.5m/sec, and the billet extraction PITCH TIME is 35~45 seconds. By using the same billet, rolling according to the pass-schedule for each rolling standard and water cooling heat treatment will produce steel grades other than SD300~SD700.
일반적으로 압연 공정은 BILLET 추출온도 1,050℃ → 압연 FINAL PASS 980℃~1,020℃ → 수냉 열처리 후 온도 4~600℃ 내외 → 제품 냉각 (공냉)의 처리 단계로 단일 연속 공정으로 이루어 진다(도 1, 도 4).In general, the rolling process consists of a single continuous process with the treatment step of BILLET extraction temperature 1,050℃ → Rolling FINAL PASS 980℃~1,020℃ → Temperature 4~600℃ after water cooling heat treatment → Product cooling (air cooling) (Fig. 1, Fig. 4).
그리고 압연 스케쥴은 And the rolling schedule is
철근 제조용 열간 압연은 BILLET라는 반 소재를 사용하여 회전하는 1쌍의 ROLL에 가열된 소재를 통과 시킴으로 규격별 철근을 만드는 가공법을 일컫는다(도 2, 도 4). 압연의 원리는 최종 제품을 기준으로 각 PASS 마다 적절한 단면적비를 줄 일 수 있는공형(CALIBER)을 각 ROLL에 가공하여 전기 MOTOR를 동력원으로 감속기를 거쳐 ROLL을 회전시킴으로서 공형으로 통과되는 소재가 변형되면서 최종 철근이라는 제품을 만든다(도 3).Hot rolling for rebar manufacturing refers to a processing method of making reinforcing bars according to specifications by passing the heated material through a pair of rotating rolls using a semi-material called billet (Fig. 2, Fig. 4). The principle of rolling is that, based on the final product, a caliber that can reduce the appropriate cross-sectional area ratio for each pass is processed on each roll, and the electric motor is used as a power source to rotate the roll through a speed reducer. A product called final rebar is made (FIG. 3).
그리고 본발명 압연에서의 슬리트 원리에 대해 설명하면, 압연 ROLL에서 통과한 직진력을 통제된 SLIT ROLLER에서 간섭부의 반발력을 이용하여 1개의 압연재를 2개의 압연재로 분리하는 과정 및 원리이다(도 5, 도 6).And, when explaining the slit principle in rolling of the present invention, it is a process and principle of separating one rolled material into two rolling materials by using the repulsive force of the interference part in the controlled SLIT ROLLER with the straight force passing through the rolling roller ( 5, 6).
압연에서 경제성은 압연에 있어 생산성(Ton/Hr)은 Final PASS에서의 ROLL의 회전 속도에 좌우되며 각 PASS별 모타의 정격 회전수 및 부하에 따라 생산 규격별로 각각 다르다. 이는 속도가 빠르면 생산성도 올라가지만 한정된 가열 능력과 한정된 모타 사양에서 생산성 증가는 제한적일 수 밖에 없다. 보통 열간압연에서의 소재의 가열온도는 철의 재결정 온도 이상 900℃~1,100℃ 내외에서 이루어지며 낮은 온도에서의 압연이 보다 우수한 품질을 가져올 수 있지만 압연 부하가 증가함으로 대용량의 압연 모타가 필요하다.In rolling, economic efficiency (Ton/Hr) in rolling depends on the rotational speed of the roll in the final pass, and it is different for each production standard according to the rated rotation speed and load of the motor for each pass. This increases productivity when the speed is high, but productivity increase is inevitably limited in limited heating capacity and limited motor specifications. Usually, the heating temperature of the material in hot rolling is made around 900℃~1,100℃ above the recrystallization temperature of iron, and rolling at a low temperature can bring better quality, but a large-capacity rolling motor is required as the rolling load increases.
이러한 동일 온도 조건에서 압연의 속도는 아래와 같이 표현된다.The rolling speed under these same temperature conditions is expressed as follows.
압연속도 Vr = Pi*Dw*N/60(mm/sec) = Pi*D*N(mm/min)Rolling continuity Vr = Pi*Dw*N/60(mm/sec) = Pi*D*N(mm/min)
* Dw(mm) : 압연 ROLL의 직경 * Dw(mm) : Diameter of rolling roll
* N(rpm) = 60Vr/Pi*Dw * N(rpm) = 60Vr/Pi*Dw
D22의 공칭 단면적은 387.1mm2 임으로 ROLL의 MAX 회전수가 800RPM이고 최종 PASS의 ROLL경이 420mm 일 경우 압연 속도는 17.6m/sec로 최고 제한 속도이다. 이때 시간당 생산량을 계략적으로 산출해보면 D22의 공칭 중량은 3.04kg/m임으로 17.6m/sec*3.04kg*3,600sec(1Hr) =192.6Ton/Hr로 이론적으로 산출되며 BILLET 추출 GAP TIME 등을 고려하면 163.7Ton/Hr 생산성을 갖게 된다.The nominal cross-sectional area of D22 is 387.1mm2, so if the maximum rotation speed of the roll is 800RPM and the diameter of the roll of the final pass is 420mm, the rolling speed is 17.6m/sec, which is the highest limiting speed. At this time, if the hourly production is calculated schematically, the nominal weight of D22 is 3.04kg/m, so 17.6m/sec*3.04kg*3,600sec(1Hr) = 192.6Ton/Hr. It has 163.7Ton/Hr productivity.
결과적으로 동일 조건에서 설비 및 품질에 문제가 없는 한 1 STRAND(도 7)보다 2 STRANDS(2 sliter)는 이론상 두배의 생산성 향상을 가져올 수 있다(도 8).As a result, under the same conditions, as long as there is no problem with equipment and quality, 2 strands (2 sliter) than 1 STRAND (FIG. 7) can in theory double the productivity (FIG. 8).
뿐만 아니라 1 STRAND 압연으로 인한 빠른 ROLL의 공형 마모로 제품 표면 및 단중이 변화가 불규칙함으로 까다로운 제품 관리가 필요한 반면에 2 STRAND 조업의 공형 사용으로 동일 생산량 대비 마모량이 적음으로 안정적이고 우수한 품질을 보다 장시간 유지할 수 있어 경제적이다.In addition, on the other hand, difficult product management is required due to irregular changes in product surface and weight due to rapid roll wear caused by 1-strand rolling. It is economical to maintain.
압연의 특성상 1개의 BILLET로 최종 제품 1개의 제품을 생산하는 설비를 동일 속도로 2개의 제품을 생산한다면 그 생산성은 두 배가 될 것이다(도 8).Due to the nature of rolling, if a facility that produces one final product with one billet produces two products at the same speed, the productivity will be doubled (FIG. 8).
따라서 본발명은 빌렛을 압연하여 정확한 치수로 품질이 우수한 이형철근을 빠른 시간내에 제조하며 경제적인 현저한 효과가 있다.Therefore, the present invention produces a deformed reinforcing bar of excellent quality with accurate dimensions by rolling a billet in a short time, and there is a significant economic effect.
Claims (3)
상기 압연재인 빌렛의 성분비율은 C28~30중량부에 대하여, Si 14~20, Mn 50~60중량부이며, 압연기를 사용할 시, 빌렛 장입 온도는 상온~780℃이며, 빌렛 추출온도 1,050℃이며, 빌렛 가열 및 추출온도는 1,030~1,100℃이며, 이형철근 최종추출온도는 980 ~ 1020℃인 것이며,
생산강종은 KS D 3504 기준 SD300~SD700 이며,
압연속도는 최종 패스(PASS) 기준하면, 최고 16.5m/sec이며
상기 압연에서의 슬리트 공정은 압연 롤을 통과한 1개의 압연재를 슬리트 롤러(SLIT ROLLER)에서 2개의 압연재로 분리하여 복수개로 만드는 과정인 것을 특징으로 하는 이형철근제조방법In the method for producing deformed reinforcing bars by rolling, wherein a billet, which is a rolled material, is charged into a rolling mill, and then subjected to a heating process while rolling, and heat treated to produce deformed reinforcing bars, wherein the final extraction temperature of the deformed rebars is 980 to 1020 ° C.
The component ratio of the billet as the rolling material is 14-20 parts by weight of Si and 50-60 parts by weight of Mn with respect to C28-30 parts by weight, and when using a rolling mill, the billet charging temperature is room temperature to 780°C, and the billet extraction temperature is 1,050°C. , billet heating and extraction temperature is 1,030 ~ 1,100 ℃, the final extraction temperature of deformed rebar is 980 ~ 1020 ℃,
The steel grade produced is SD300~SD700 based on KS D 3504,
The rolling speed is up to 16.5 m/sec based on the final pass.
The slitting process in the rolling is a method for manufacturing deformed reinforcing bars, characterized in that the one rolled material that has passed through the rolling roll is separated into two rolled materials in a slit roller to make a plurality of them.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR950032655A (en) * | 1994-05-02 | 1995-12-22 | 오오따니 시게히사 | High adhesion, high strength release bar and manufacturing method |
| KR20120122249A (en) * | 2011-04-28 | 2012-11-07 | 현대제철 주식회사 | a manufaturing method of reinforced steel bar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR950032655A (en) * | 1994-05-02 | 1995-12-22 | 오오따니 시게히사 | High adhesion, high strength release bar and manufacturing method |
| KR20120122249A (en) * | 2011-04-28 | 2012-11-07 | 현대제철 주식회사 | a manufaturing method of reinforced steel bar |
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