JP4942388B2 - Composite roll for rolling - Google Patents
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- JP4942388B2 JP4942388B2 JP2006124642A JP2006124642A JP4942388B2 JP 4942388 B2 JP4942388 B2 JP 4942388B2 JP 2006124642 A JP2006124642 A JP 2006124642A JP 2006124642 A JP2006124642 A JP 2006124642A JP 4942388 B2 JP4942388 B2 JP 4942388B2
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- 238000005096 rolling process Methods 0.000 title claims description 76
- 239000002131 composite material Substances 0.000 title claims description 31
- 239000000463 material Substances 0.000 claims description 64
- 239000010959 steel Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000011162 core material Substances 0.000 description 79
- 239000007921 spray Substances 0.000 description 13
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- 238000005266 casting Methods 0.000 description 7
- 238000007711 solidification Methods 0.000 description 6
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- 238000005098 hot rolling Methods 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
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- 238000005097 cold rolling Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910001361 White metal Inorganic materials 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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Description
本発明は、熱間圧延又は冷間圧延用の複合ロールに関する。 The present invention relates to a composite roll for hot rolling or cold rolling.
ホットストリップミルの熱間圧延用ロールは、典型的には、外周面が圧延面となる外層が遠心鋳造や鋳掛により製造された鋳造材によって形成され、前記外層の内側に芯材が静置鋳造による高級鋳鉄や球状黒鉛鋳鉄等の鋳造材又は圧延や鍛造による鋼材によって形成され、外層と芯材とが溶着一体化(冶金学的に一体化)された構成であり、芯材の軸方向両端部に形成された軸部にはチョック(ベアリング等を含む軸受機構)が装着されている。
この熱間圧延用複合ロールは、使用状態に応じて、適宜、ロール外層の圧延面を良好な表面状態に回復させるために、ロール研削機による研削が繰り返し行われる。例えば、仕上スタンドでは、１０００〜１００００トンの圧延毎に、ロール外層の圧延面の研削(０.１〜１ｍｍ)が行われ、その研削回数は約３００回に達する場合がある。
A hot strip mill hot rolling roll is typically formed of a cast material whose outer surface is a rolled surface and formed by centrifugal casting or casting, and a core material is statically cast inside the outer layer. It is made of cast material such as high-grade cast iron or spheroidal graphite cast iron or steel material by rolling or forging, and the outer layer and core material are welded and integrated (metallurgically integrated), and both axial ends of the core material A chock (bearing mechanism including a bearing or the like) is attached to the shaft portion formed in the portion.
This composite roll for hot rolling is repeatedly ground by a roll grinder in order to properly restore the rolled surface of the roll outer layer to a good surface state according to the state of use. For example, in a finishing stand, the rolling surface of the outer layer of the roll is ground (0.1 to 1 mm) every 1000 to 10,000 tons, and the number of times of grinding may reach about 300 times.
従来、圧延機からロールを取り外して研削作業場においてロール研削作業を行うに際して、チョックをロール軸部から取り外して研削作業を行う場合とチョックをロール軸部に装着したままで研削作業を行う場合があった。
ロール外層の研削時にチョックをロール軸から取り外して研削作業を行なう場合、ロールの回転支持は、軸受け材料で成形されたレスト装置によりロールのジャーナル部を受けて支持することによりロールの重量を回転可能に支持するものがある（特許文献１）。
ロール外層の研削時にチョックをロール軸部に装着したままで研削作業を行う場合、外層の両肩部に設けられたランド部を、受金をもつ受台によって支持することによって、ロール重量を回転可能に支持し、チョック重量は上記とは別の受台により支持している（特許文献２）。
いずれの場合も、図６に示すように、上記ジャーナル部やランド部等のロール外層の両肩部に形成された環状受部(3)を、上記レスト装置やロール受台等のロール支持部材(5)によって支持することにより、研削作業時にロールの回転支持を行っている。図６で、(4)はロール軸部(2)に装着されたチョックを示す。
Conventionally, when a roll is removed from a rolling mill and a roll grinding operation is performed in a grinding work place, there are a case where the chock is removed from the roll shaft portion and a grinding operation is performed, and a case where the chock is attached to the roll shaft portion and the grinding operation is performed. It was.
When grinding is performed with the chock removed from the roll shaft during grinding of the outer layer of the roll, the roll rotation can be supported by receiving and supporting the roll journal by a rest device formed of bearing material. (Patent Document 1).
When grinding with the chock attached to the roll shaft when grinding the outer layer of the roll, the roll weight is rotated by supporting the land portions provided on both shoulders of the outer layer with a cradle with a catcher. The chock weight is supported by a cradle different from the above (Patent Document 2).
In any case, as shown in FIG. 6, an annular receiving part (3) formed on both shoulders of the outer roll layer such as the journal part and the land part is used as a roll supporting member such as the rest device and the roll cradle. By supporting by (5), the roll is supported during grinding. In FIG. 6, (4) shows a chock mounted on the roll shaft (2).
ロールの重量は約５〜２０トンもあり、場合によっては、ロール重量に加えてチョックの重量（典型的なもので、約５トン）も支持することもあるため、支持部材(5)によって回転可能に支持されるロールの環状受部(3)は、摩擦力に対する耐磨耗性を要求される領域であった。
しかし、上記構成の圧延用複合ロールに環状受部(3)が形成される領域は、鋳造材よりなる場合はロールを支持するのに硬度が不十分であったり硬度の均一性が得られない問題があり、また鋼材よりなる場合は硬度が十分でないときにその領域だけの硬度を上げることが困難である問題がある。
このため、外層の圧延面の研削作業を繰り返すうちに、環状受部は、硬さが充分でないことや硬さの不均一に起因して、磨耗量が多くなったり、局部的に摩耗量が異なるいわゆる偏摩耗を生じる。そして環状受部が磨耗したり偏摩耗した状態でロールの研削作業を行なうと、研削されたロールの真円度が低下する。
The roll weight is about 5 to 20 tons. In some cases, the weight of the chock (typically about 5 tons) may be supported in addition to the roll weight. The annular receiving portion (3) of the roll that is supported as possible is an area that requires wear resistance against frictional forces.
However, the region in which the annular receiving portion (3) is formed in the composite roll for rolling having the above-described configuration, when made of cast material, has insufficient hardness to support the roll or hardness uniformity cannot be obtained. There is a problem, and when it is made of steel, there is a problem that it is difficult to increase the hardness of only that region when the hardness is not sufficient.
For this reason, while repeating the grinding operation of the outer surface of the rolled surface, the annular receiving portion has a large amount of wear or a local amount of wear due to insufficient hardness or uneven hardness. Different so-called uneven wear occurs. If the roll is ground while the annular receiving portion is worn or unevenly worn, the roundness of the ground roll decreases.
本発明の目的は、圧延部の圧延面を研削する際、ロール支持部材によって支持される環状受部において磨耗や偏摩耗が生じるのを極力防止し、ロール圧延面の研削を行ってもロール圧延使用時において必要とされるロール真円度を維持することができるようにすることである。 An object of the present invention is to prevent wear and uneven wear as much as possible in an annular receiving portion supported by a roll support member when grinding a rolled surface of a rolled portion, and roll rolling even if the rolled surface is ground. It is to be able to maintain the roll roundness required at the time of use.
本発明の圧延用複合ロールは、外周に圧延面を有する圧延部と、該圧延部の径方向内側及び圧延部より軸方向外側に位置する芯部とを備え、該芯部は、軸受により回転可能に支持される軸部を圧延部より軸方向外側に備え、軸方向において圧延部と軸部との間に位置する芯部には、ロール支持部材によって支持される環状受部を備え、該環状受部は、芯部に設けられた鍛造材若しくは圧延材からなる部材により、又は芯部に溶射された溶射部材により形成されていることを特徴とするものである。
環状受部の外径寸法は、圧延部外径以下の寸法、より好ましくは圧延部外径の設計使用限度外径以下の寸法、かつ軸部外径以上の寸法であることが好ましい。
環状受部の外周面の硬度はショアー硬さ４５以上であることが好ましい。
鋳造材または圧延材からなる部材は、鋼材で構成された環状体でありその外表面が表面焼入れされ、芯部に嵌合されていることが好ましい。
The rolling composite roll of the present invention comprises a rolled part having a rolling surface on the outer periphery, and a core part located radially inside the rolled part and axially outside the rolled part, and the core part is rotated by a bearing. A shaft portion that is supported is provided on the axially outer side from the rolling portion, and a core portion positioned between the rolling portion and the shaft portion in the axial direction is provided with an annular receiving portion supported by a roll support member, The annular receiving portion is formed by a member made of a forging material or a rolled material provided in the core portion, or by a thermal spraying member sprayed on the core portion.
The outer diameter of the annular receiving part is preferably a dimension equal to or smaller than the outer diameter of the rolled part, more preferably a dimension equal to or smaller than the design use limit outer diameter of the rolled part outer diameter, and a dimension equal to or larger than the outer diameter of the shaft part.
The hardness of the outer peripheral surface of the annular receiving portion is preferably a Shore hardness of 45 or more.
The member made of a cast material or a rolled material is an annular body made of a steel material, and it is preferable that the outer surface thereof is surface-hardened and fitted to the core portion.
本発明の圧延用複合ロールにおける環状受部は、鍛造材若しくは圧延材からなる部材により、又は溶射部材により形成されているから、その部分の硬さをロールを支持するのに必要な耐磨耗性を得るために必要な硬さに調整することが容易であり、又環状受部における硬度のバラツキが鋳造材に比べて少ないから、ロール支持に支障をきたすような磨耗や偏摩耗は起こらず、ロール外層の圧延面の研削作業を行っても、ロール圧延使用時において必要とされるロール真円度を維持することができるロールを得ることができる。
また、環状受部の外径寸法を、圧延部外径以下の寸法、かつ軸部外径以上の寸法とする場合には、圧延面の研削作業を環状受部により支障を受けることなく行うことができ、かつロール強度も保つことができる。
また、環状受部の外径寸法を圧延部外径の設計使用限度外径以下の寸法とする場合は、圧延面の研削作業を環状受部により支障を受けることなく圧延部の設計使用限度厚さまで行うことができる。
また、環状受部の外周面の硬度を、ショアー硬さＨｓ４５以上とする場合は、環状受部がすぐれた耐摩耗性を発揮することができる。
また、鍛造材又は圧延材からなる部材が、鋼材で構成された環状体でありその外表面が表面焼入れされており、芯部に嵌合されている場合は、環状受部に必要とされる耐磨耗性をその必要とされる環状体の表面部分に焼入れ加工により付加することができ、ロール全体のコストアップとすることなく、ロール外層の圧延面の研削作業を行っても、ロール圧延使用時において必要とされるロール真円度を維持することができる。
Since the annular receiving part in the composite roll for rolling of the present invention is formed by a member made of a forged material or a rolled material, or by a thermal spray member, the wear resistance necessary to support the roll with the hardness of that part. It is easy to adjust to the necessary hardness to obtain the properties, and since there is less variation in hardness at the annular receiving part compared to the cast material, there is no wear or uneven wear that interferes with the roll support. Even if the rolling operation of the rolled surface of the outer roll layer is performed, a roll capable of maintaining the roll roundness required when using roll rolling can be obtained.
In addition, when the outer diameter of the annular receiving part is set to be equal to or smaller than the outer diameter of the rolling part and larger than the outer diameter of the shaft part, the grinding operation of the rolling surface should be performed without being hindered by the annular receiving part. And roll strength can be maintained.
In addition, when the outer diameter of the annular receiving part is set to be equal to or less than the design use limit outer diameter of the outer diameter of the rolling part, the design use limit thickness of the rolling part is not affected by the annular receiving part. Can be done.
Moreover, when the hardness of the outer peripheral surface of the annular receiving portion is set to a Shore hardness Hs45 or more, the annular receiving portion can exhibit excellent wear resistance.
Moreover, the member which consists of a forging material or a rolling material is an annular body comprised with steel materials, and when the outer surface is surface-hardened and it is fitted by the core part, it is required for an annular receiving part. Roll resistance can be applied to the surface part of the annular body where it is required by quenching, and roll rolling even if the rolling surface of the outer layer of the roll is ground without increasing the cost of the entire roll. The roll roundness required at the time of use can be maintained.
本発明の圧延用複合ロールは、外周が圧延面となる外層が遠心力鋳造された後、遠心力鋳造金型を起立させ、その両端に芯材鋳込み用の上型と下型を配備して静置鋳型を構成し、その内部に芯材溶湯を鋳込むことによって形成される。外層の凝固完了直後又は凝固途中に、芯材を鋳造することにより、外層と芯材は溶着一体化される。
なお、圧延用複合ロールには、外層の凝固完了直後又は凝固途中に、外層の内側に中間層をさらに遠心力鋳造し、中間層の凝固完了直後又は凝固途中に、中間層の内側に芯材を静置鋳造し、外層、中間層及び芯材を溶着一体化させるものがある。本発明は、このような中間層を有する複合ロールにも適用できることは勿論である。
遠心力鋳造用金型は、回転軸が水平方向の横型、斜め方向の傾斜型、垂直方向の縦型の各種方法を適用することができる。
In the composite roll for rolling of the present invention, after the outer layer whose outer periphery is the rolling surface is cast by centrifugal force, the centrifugal casting mold is erected, and an upper die and a lower die for casting a core material are provided at both ends thereof. It is formed by forming a stationary mold and casting a molten core material into the inside thereof. By casting the core material immediately after completion of solidification of the outer layer or during solidification, the outer layer and the core material are welded and integrated.
In the composite roll for rolling, immediately after completion of solidification of the outer layer or during solidification, an intermediate layer is further cast on the inner side of the outer layer, and immediately after completion of solidification of the intermediate layer or during solidification, the core material is placed inside the intermediate layer. In which the outer layer, the intermediate layer, and the core material are welded and integrated. Of course, the present invention can also be applied to a composite roll having such an intermediate layer.
Various methods can be applied to the centrifugal casting mold, in which the rotation axis is a horizontal type in the horizontal direction, an inclined type in the oblique direction, and a vertical type in the vertical direction.
本発明におけるロールの圧延部は、その外周に圧延面を有し、圧延材に接し、直接圧延使用される部分であり、その領域は外層の一部又は全部で構成される。遠心力鋳造により外層を製造する場合、その外層の厚さは、補修のため圧延面を研削して圧延に使用される設計使用層厚さに対して、１０ｍｍ程度の余肉厚さを設けることが多い。従って、圧延部の圧延に使用される部分の厚さは、最大限外層の厚さであるが、通常は外層における芯材との境界部において組織が劣化する虞を考慮して、外層厚さより少ない厚さとされる。
本発明における芯部は、圧延部より径方向内側部分及び圧延部より軸方向外側部分を意味するので、外層と芯材からなる２層ロールの場合は、外層のうち圧延に使用されない部分と芯材で構成され、外層と中間層と芯材からなる３層ロールの場合は、外層のうち圧延に使用されない部分と中間層と芯材で構成される。
The rolled portion of the roll according to the present invention is a portion that has a rolling surface on the outer periphery thereof, is in contact with the rolled material, and is used for direct rolling, and the region is constituted by a part or all of the outer layer. When manufacturing the outer layer by centrifugal casting, the outer layer should have a thickness of about 10 mm with respect to the design layer thickness used for rolling by grinding the rolling surface for repair. There are many. Therefore, the thickness of the portion used for rolling of the rolling part is the maximum thickness of the outer layer, but in consideration of the possibility that the structure deteriorates at the boundary between the outer layer and the core material, Less thickness.
Since the core part in the present invention means a radially inner part from the rolled part and an axially outer part from the rolled part, in the case of a two-layer roll comprising an outer layer and a core material, a part and a core that are not used for rolling in the outer layer. In the case of a three-layer roll composed of an outer layer, an intermediate layer, and a core material, the outer layer includes a portion that is not used for rolling, an intermediate layer, and a core material.
芯部の軸方向両端部には、ロールを圧延使用時に回転可能に支持する軸受け部に支持される軸部が形成されている。
環状受部は、軸方向において圧延部と軸部との間に位置する芯部中間部において、芯部の外周面に、圧延部の軸方向端部と連続又は近接する位置に周設され、鍛造材若しくは圧延材からなる部材により、又は溶射材が溶射された溶射部材により形成される。
Shaft portions that are supported by bearing portions that rotatably support the roll during rolling are formed at both axial ends of the core portion.
The annular receiving portion is provided in the core intermediate portion located between the rolled portion and the shaft portion in the axial direction, on the outer peripheral surface of the core portion, at a position continuous or close to the axial end of the rolled portion, It is formed by a member made of a forged material or a rolled material, or by a sprayed member on which a sprayed material is sprayed.
環状受部の外径は圧延部の外径以下の寸法又は圧延部の外径より小さい寸法とされ、軸部外径以上の寸法又は軸部外径より大きな寸法とすることが必要である。この場合、圧延部の外径は、その最大外径はロール製造時における外径であり、その最小外径は補修のために圧延面を複数回にわたって研削して使用する設計使用限度となる外径（廃棄径）である。環状受部の外径は、最適には、上記設計使用限度外径（廃棄径）以下の寸法又は設計使用限度外径より小さな寸法とする。これは、環状受部の外径が圧延部の外径より大きくなると、研削時に環状受部が切削工具移動の支障となりロール圧延面の研削作業が困難になり、軸部径より小さくなるとロール強度面で問題になるからである。また、環状受部の外径を設計使用限度外径以下とすれば、ロール圧延面の研削作業を環状受部により支障を受けることなくロールの設計使用限度まで行うことができる。 The outer diameter of the annular receiving part is set to a dimension equal to or smaller than the outer diameter of the rolled part or smaller than the outer diameter of the rolled part, and needs to be larger than the outer diameter of the shaft part or larger than the outer diameter of the shaft part. In this case, the outer diameter of the rolled portion is the maximum outer diameter at the time of roll production, and the minimum outer diameter is the design use limit for grinding the rolled surface multiple times for repair. The diameter (discarded diameter). The outer diameter of the annular receiving portion is optimally set to a dimension equal to or smaller than the design use limit outer diameter (discard diameter) or smaller than the design use limit outer diameter. This is because if the outer diameter of the annular receiving part is larger than the outer diameter of the rolled part, the annular receiving part becomes an obstacle to the movement of the cutting tool during grinding, making it difficult to grind the roll rolling surface. This is a problem. Further, if the outer diameter of the annular receiving portion is set to be equal to or smaller than the design use limit outer diameter, the roll rolling surface can be ground to the design use limit of the roll without being hindered by the annular receiving portion.
外層の材料は、ハイス系鋳鉄材、高合金グレン材、高クロム鋳鉄材等のように、耐摩耗性にすぐれる材料が好適に用いられ、芯材は、高級鋳鉄材、ダクタイル鋳鉄材が好適に用いられる。
外層に中間層を含む場合、中間層の材料として、アダマイト材又は黒鉛鋼又はダクタイル鋳鉄が好適に用いられる。
As the outer layer material, a material having excellent wear resistance such as high-speed cast iron material, high alloy grain material, high chrome cast iron material, etc. is preferably used, and as the core material, high-grade cast iron material, ductile cast iron material is suitable. Used for.
When the outer layer includes an intermediate layer, an adamite material, graphite steel, or ductile cast iron is suitably used as the intermediate layer material.
本発明は上記のような遠心鋳造により外層を製造する遠心鋳造製複合ロール以外に鋳掛け法（ＣＰＣ法）により製造する複合ロールにも適用することができる。
この場合、芯材は鋼材でありこの鋼材の外周と鋳型の間に、溶融したハイス系合金が供給されこれが芯材の鋼材外周に溶着してハイス系合金の外層が形成される。
この鋳掛け複合ロールにおいても遠心力鋳造複合ロールと同様に、本発明における圧延部は、外層の一部又は全部で構成される。本発明の芯部は、外層のうち圧延に使用されない部分と芯材で構成される。軸部、環状受部の構成については上記遠心鋳造複合ロールと同様の構成とすることができるので、説明を省略する。
なお、鋳掛け複合ロールの場合は、芯材が鋼材であるので、この鋼材部分を環状受部にする場合と、本発明の場合を比較すると、本発明では環状受部は、芯部に設けられた鍛造材若しくは圧延材からなる部材により、又は芯部に溶射された溶射部材により形成されているので、鋼材ではロールを回転支持するのに耐磨耗性が不足する場合に、芯部全体でなく、耐磨耗性が必要とされる部分（環状受部）だけにロールを回転支持するのに必要な耐磨耗性を付加することが容易にでき、ロール全体のコストアップとなることがない。
The present invention can be applied to a composite roll manufactured by a casting method (CPC method) in addition to a centrifugal cast composite roll that manufactures an outer layer by centrifugal casting as described above.
In this case, the core material is a steel material, and a molten high-speed alloy is supplied between the outer periphery of the steel material and the mold, and this is welded to the outer periphery of the steel material of the core material to form an outer layer of the high-speed alloy.
Also in this cast composite roll, like the centrifugal cast composite roll, the rolled portion in the present invention is constituted by a part or all of the outer layer. The core part of this invention is comprised with the part and core material which are not used for rolling among outer layers. About the structure of a shaft part and an annular receiving part, since it can be set as the structure similar to the said centrifugal casting composite roll, description is abbreviate | omitted.
In the case of a cast composite roll, since the core material is a steel material, comparing the case where the steel material portion is an annular receiving portion and the case of the present invention, the annular receiving portion is provided in the core portion in the present invention. Since the steel material is formed by a member made of forged material or rolled material, or by a sprayed member sprayed on the core part, when the wear resistance is insufficient to rotate and support the roll in the steel part, In addition, it is easy to add the wear resistance necessary to rotationally support the roll only to the part where the wear resistance is required (annular receiving part), which can increase the cost of the entire roll. Absent.
＜実施例１＞
環状受部は、鍛造材又は圧延材からなる部材によって形成される。前記部材は、例えば、環状スリーブであり、図１は、環状スリーブが芯部に装着された複合ロールを示している。
図１中、(1)は遠心鋳造又は鋳掛けにより製造した外層、(2)は鋳造材又は鋼材からなる芯材、(3)は環状受部、(11)は圧延部、(12)は芯部、(12a)はロール圧延使用時に軸受け部により回転可能に支持される軸部、(12b)は軸方向において圧延部と軸部との間に位置する芯部中間部、(12c)は圧延部(11)の径方向内側に位置する芯部中央部、(30)は環状スリーブであり、芯部中間部(12b)に設けられる。この実施例では芯部中間部(12b)の外径は、圧延部(11)外径より小さく軸部(12a)外径より大きく形成され、芯部中間部(12b)は圧延部(11)と軸部(12a)との間で段部(13)となっている。環状スリーブ(30)は芯部(12)における段部(13)に装着され、環状スリーブ(30)の外径は、圧延部(11)外径より小さく軸部(12a)外径より大きく形成されている。
<Example 1>
The annular receiving portion is formed by a member made of a forged material or a rolled material. The member is, for example, an annular sleeve, and FIG. 1 shows a composite roll in which the annular sleeve is attached to the core.
In FIG. 1, (1) is an outer layer manufactured by centrifugal casting or casting, (2) is a core made of cast or steel, (3) is an annular receiving part, (11) is a rolled part, and (12) is a core. Part, (12a) is a shaft part that is rotatably supported by the bearing part when using roll rolling, (12b) is a core intermediate part located between the rolling part and the shaft part in the axial direction, (12c) is rolled A central portion of the core portion located on the radially inner side of the portion (11), (30) is an annular sleeve, and is provided in the intermediate portion (12b) of the core portion. In this embodiment, the outer diameter of the core intermediate portion (12b) is formed to be smaller than the outer diameter of the rolled portion (11) and larger than the outer diameter of the shaft portion (12a), and the intermediate portion of the core portion (12b) is formed of the rolled portion (11). And a shaft portion (12a), a step portion (13) is formed. The annular sleeve (30) is attached to the step portion (13) in the core portion (12), and the outer diameter of the annular sleeve (30) is smaller than the outer diameter of the rolled portion (11) and larger than the outer diameter of the shaft portion (12a). Has been.
外層(1)は、外周面が圧延面として供され、ロール胴部を構成する。芯材(2)は外層(1)の径方向内側に位置しかつ外層(1)の軸方向外側まで伸びるいわゆるロール軸であり、その軸方向両端部が第５図で示されたチョック(4)等の軸受により回転支持されるロール軸部(12a)を構成する。
外層(1)のうち圧延に使用される部分が圧延部(11)であり、芯部(12)は外層(1)のうち圧延に使用されない部分と芯材(2)で構成される。
つまり、芯部(12)は、圧延部(11)の径方向内側の芯部中央部(12c)と、圧延部(11)より軸方向外側の軸方向両端部に位置し軸受により支持される軸部(12a)と、軸方向において圧延部(11)又は芯部中央部(12c)と軸部(12a)との間に位置する芯部中間部(12b)で構成される。
例えば、熱間圧延の仕上スタンド用ロールの場合、ロール胴部は、外径約５００〜９００ｍｍ、長さ約１４００〜３０００ｍｍであり、ロール軸の全長は約３５００〜６１００ｍｍである。
The outer layer (1) has an outer peripheral surface serving as a rolling surface and constitutes a roll body. The core material (2) is a so-called roll shaft that is located on the radially inner side of the outer layer (1) and extends to the outer side in the axial direction of the outer layer (1), and both end portions in the axial direction are chocks (4 ) Or the like to constitute a roll shaft portion (12a) that is rotatably supported.
The portion used for rolling in the outer layer (1) is a rolled portion (11), and the core portion (12) is constituted by a portion not used for rolling in the outer layer (1) and a core material (2).
That is, the core portion (12) is positioned at the center portion (12c) in the radial direction inside the rolled portion (11) and at both axial end portions in the axial direction outside the rolled portion (11) and is supported by the bearings. The shaft portion (12a) and the core portion intermediate portion (12b) positioned between the rolling portion (11) or the center portion of the core portion (12c) and the shaft portion (12a) in the axial direction.
For example, in the case of a hot rolling finishing stand roll, the roll body has an outer diameter of about 500 to 900 mm, a length of about 1400 to 3000 mm, and a total length of the roll shaft of about 3500 to 6100 mm.
外層(1)は、一般的には、圧延使用層に約１０ｍｍの余肉を加えた層厚であり、その層厚は約３０〜７０ｍｍである。圧延使用層は、被圧延材に接し、直接圧延に供される部分であり、その厚さは、ミル設計時に決定されている。
環状受部(3)は、外径約４００〜７００ｍｍ、軸方向長さ約１２０〜３７０ｍｍである。なお、環状受部(3)の外径は、外層がワークロールとして使用される限界径である設計使用限度外径（廃棄径）よりも小さくなるように設計される。これはロール研削機の砥石の軸方向移動の支障にならないようにするためである。なお、ロール研削時の研削負荷を受ける際の応力集中を避けるために、環状受部の外径は大きい方が好ましいので、ロールの前記廃棄径にできるだけ近い寸法に設定することが望ましい。
The outer layer (1) is generally a layer thickness obtained by adding a surplus of about 10 mm to the rolling working layer, and the layer thickness is about 30 to 70 mm. The rolling layer is a portion that is in direct contact with the material to be rolled and directly subjected to rolling, and its thickness is determined at the time of mill design.
The annular receiving portion (3) has an outer diameter of about 400 to 700 mm and an axial length of about 120 to 370 mm. The outer diameter of the annular receiving portion (3) is designed to be smaller than the design use limit outer diameter (discard diameter), which is a limit diameter in which the outer layer is used as a work roll. This is in order not to hinder the axial movement of the grinding wheel of the roll grinder. In order to avoid stress concentration when receiving a grinding load at the time of roll grinding, it is preferable that the outer diameter of the annular receiving portion is larger, so it is desirable to set the dimensions as close as possible to the discard diameter of the roll.
環状受部(3)を構成する環状スリーブ(30)は、鍛造材又は圧延材から形成され、通常の焼入れ、焼戻しの熱処理を施すことにより、少なくとも環状スリーブの外表面がショアー硬度Ｈｓ４５以上を得られる材料が好適に用いられる。その材種として、例えば、ＳＣ、ＳＮＣ、ＳＣｒ、ＳＣＭ、ＳＮＣＭ等のように、ＪＩＳに規定される構造用炭素鋼、構造用合金鋼が挙げられる。また、圧延用複合ロールが腐食環境で使用される場合、耐食性にすぐれるステンレス鋼を用いることが好ましい。
鍛造材又は圧延材を用いるのは、これら材料は、鍛造又は圧延工程を経ることによって、微細で均一な金属組織を有しており、硬度のバラツキが少なく、ロール支持部材によって支持される際、偏摩耗を生じ難いからである。
ショアー硬度Ｈｓ４５以上とするのは、所定の耐摩耗性を具備させるためであり、Ｈｓ６０以上がより望ましい。
The annular sleeve (30) constituting the annular receiving portion (3) is formed of a forged material or a rolled material, and is subjected to a normal quenching and tempering heat treatment so that at least the outer surface of the annular sleeve has a Shore hardness of Hs45 or more. The material used is preferably used. Examples of the material type include structural carbon steel and structural alloy steel defined in JIS, such as SC, SNC, SCr, SCM, SNCM, and the like. Moreover, when the composite roll for rolling is used in a corrosive environment, it is preferable to use stainless steel having excellent corrosion resistance.
The forged material or the rolled material is used because these materials have a fine and uniform metal structure through a forging or rolling process, have less variation in hardness, and are supported by a roll support member. This is because uneven wear hardly occurs.
The reason why the Shore hardness is Hs45 or more is to provide a predetermined wear resistance, and Hs60 or more is more desirable.
圧延部(11)と軸部(12a)との間に位置する芯部中間部(12b)は、外層(1)の軸方向両端部を削り取り形成するが、場合によっては外層(1)の内側に外層(1)内径と同径の外径をもつ芯材(2)を形成した後、この芯材(2)を削って芯部中間部(12b)と軸部(12a)を形成してもよい。環状スリーブ(30)は、このように形成された芯部中間部(12b)に装着される。
環状スリーブ(30)の芯部(12)への装着は、焼嵌めによって行なうことが好ましい。
なお、焼嵌め率は、２／１００００乃至１５／１００００程度でよい。２／１００００より小さいと、環状スリーブが空転する可能性があるためであり、１５／１００００よりも大きくする必要性はなく、焼嵌め作業に時間がかかるのを避けるためである。
The core intermediate part (12b) located between the rolled part (11) and the shaft part (12a) is formed by scraping both axial ends of the outer layer (1), but in some cases, the inner part of the outer layer (1). After forming the core material (2) having the same outer diameter as the inner diameter of the outer layer (1), the core material (2) is shaved to form the core intermediate portion (12b) and the shaft portion (12a). Also good. The annular sleeve (30) is attached to the core intermediate part (12b) formed in this way.
The annular sleeve (30) is preferably attached to the core (12) by shrink fitting.
The shrinkage fit may be about 2/10000 to 15/10000. If it is smaller than 2/10000, there is a possibility that the annular sleeve is idled, and it is not necessary to make it larger than 15/10000, and this is to avoid taking time for shrink fitting.
環状受部(30)は、図２に示す如く、製造上の容易性から、芯部(12)の段部(13)全体を環状スリーブで構成してもよいし、図３に示されるように、ロール研削機のロール支持部材と接触する部分だけを環状スリーブから構成するようにしてもよい。
なお、芯部中間部(12b)は、圧延部(11)の端部と隣接する箇所に応力が集中するのを避けるために、図２に示す如く、圧延部(11)と芯部中間部(12b)とのコーナ部(20)にはＲが形成されている。このため、環状スリーブ(30)の外層側端部は、Ｒ部との接触を回避するために、テーパ部(30a)が形成されている。勿論テーパではなくＲ形状でも問題はないが、加工時間が長くなる可能性がある。
環状スリーブ(30)の肉厚は、約１０〜５０ｍｍであることが好ましい。約１０ｍｍよりも薄いと、スリーブの焼嵌め力が不足し、また、前記コーナ部(20)のＲを大きくすることができず、圧延荷重による応力集中が大きくなるためである。一方、あまり厚くすると、芯材部の外径が小さくなり、ロール軸の強度不足を生ずる虞れがあるので、５０ｍｍ以下にすることが好ましい。
As shown in FIG. 2, the annular receiving portion (30) may be formed of an annular sleeve for the entire step portion (13) of the core portion (12) for ease of manufacturing, as shown in FIG. In addition, only the portion that comes into contact with the roll support member of the roll grinding machine may be formed of an annular sleeve.
The core intermediate portion (12b) is formed between the rolled portion (11) and the core intermediate portion, as shown in FIG. 2, in order to avoid stress concentration on the portion adjacent to the end of the rolled portion (11). R is formed in the corner portion (20) with (12b). For this reason, a tapered portion (30a) is formed at the outer layer side end of the annular sleeve (30) in order to avoid contact with the R portion. Of course, there is no problem with the R shape instead of the taper, but there is a possibility that the processing time becomes long.
The wall thickness of the annular sleeve (30) is preferably about 10 to 50 mm. If the thickness is less than about 10 mm, the shrink-fitting force of the sleeve is insufficient, and the R of the corner portion (20) cannot be increased, and the stress concentration due to the rolling load increases. On the other hand, if the thickness is too large, the outer diameter of the core portion is reduced, and there is a risk of insufficient strength of the roll shaft.
環状受部を、Ｓ４５Ｃの鍛造材から形成した環状スリーブを、焼嵌めにより芯部に装着した圧延用複合ロールを作製した。ロール胴部は、外径８００ｍｍ、長さ２３５０ｍｍであり、ロール軸は全長５３０２ｍｍであり、外層は、層厚７０ｍｍ、圧延使用層厚さ５８ｍｍである。環状スリーブは、図２に示す例であり、外径６７０ｍｍ、肉厚３５ｍｍ、硬度は、ショアー硬さＨｓ６５である。この圧延用ロールについて、外層の圧延面の研削作業を約３００回行なったが、環状受部に偏摩耗は殆んど生じなかった。 A composite roll for rolling was produced in which an annular sleeve formed of a forged material of S45C was attached to the core by shrink fitting. The roll body portion has an outer diameter of 800 mm and a length of 2350 mm, the roll shaft has a total length of 5302 mm, and the outer layer has a layer thickness of 70 mm and a rolling working layer thickness of 58 mm. The annular sleeve is an example shown in FIG. 2 and has an outer diameter of 670 mm, a wall thickness of 35 mm, and a hardness of Shore hardness Hs65. With respect to this rolling roll, grinding of the outer layer rolling surface was performed about 300 times, but there was almost no uneven wear in the annular receiving portion.
環状受部を、ＳＣＭ４４０の圧延材から形成した環状スリーブを、焼嵌めにより芯部に装着した圧延用複合ロールを作製した。ロール胴部は、外径８２５ｍｍ、長さ１５８０ｍｍであり、ロール軸は全長５３９０ｍｍであり、外層は、層厚５５ｍｍ、圧延使用層厚さ４５ｍｍである。環状スリーブは、図３に示す例であり、外径７００ｍｍ、肉厚３５ｍｍ、硬度は、ショアー硬さＨｓ７０である。この圧延用ロールについて、外層の圧延面の研削作業を約３００回行なったが、環状受部に偏摩耗は殆んど生じなかった。 A composite roll for rolling was prepared in which an annular sleeve formed from a rolled material of SCM440 was attached to the core portion by shrink fitting. The roll body portion has an outer diameter of 825 mm and a length of 1580 mm, the roll shaft has a total length of 5390 mm, and the outer layer has a layer thickness of 55 mm and a rolling working layer thickness of 45 mm. The annular sleeve is an example shown in FIG. 3, and has an outer diameter of 700 mm, a wall thickness of 35 mm, and a hardness of Shore hardness Hs70. With respect to this rolling roll, grinding of the outer layer rolling surface was performed about 300 times, but there was almost no uneven wear in the annular receiving portion.
なお、環状スリーブの芯部への装着は、焼嵌めの他、溶接により、又はボルト等の適当な締結具を用いて行なうことができる。
また、ロール支持部材は、ホワイトメタル等の軸受材料で形成され環状受部形状に沿った上向き弧状をなす形状の受金をもつものやＹ字形状をなす受金をもつものや場合よっては一対のローラーであってもよく、その材質や形状は問わずロールやチョックの重量を支えロールを回転支持できるものであればよい。なお、環状受部と、ロール支持部材との間は、摩擦を少なくするため潤滑油が使用される場合がある。
The annular sleeve can be attached to the core part by shrinkage fitting, welding, or using an appropriate fastener such as a bolt.
In addition, the roll support member is formed of a bearing material such as white metal, and has a shape of a metal receiving portion that forms an upward arc shape along the shape of the annular receiving portion, or has a shape of a Y shape receiving portion, or a pair of cases. Any material and shape may be used as long as they can support the weight of the roll or chock and can rotate and support the roll. In addition, lubricating oil may be used between an annular receiving part and a roll support member in order to reduce friction.
＜実施例２＞
実施例２の環状受部(3)は、図４に示される如く、外層(1)の軸方向両端部を削り取って形成した圧延部(11)と軸部(12a)との間に位置する芯部(12)に、溶射材を溶射された溶射部材(32)により形成される。
上記実施例では、実施例１と同様に、圧延部と軸部との間に位置する芯部中間部(12b)の外径は、圧延部(11)外径より小さく軸部(12a)外径より大きく形成され、芯部中間部(12b)は段部(13)となっており、この段部(13)に溶射部材(32)を形成して環状受部としているが、芯部中間部(12b)を段部(13)としないで、芯部中間部(12b)の外径を軸部(12a)外径と同径にして同径とした芯部中間部(12b)に溶射部材を形成して環状受部としてもよい。
<Example 2>
As shown in FIG. 4, the annular receiving portion (3) of Example 2 is positioned between the rolling portion (11) and the shaft portion (12a) formed by scraping off both axial ends of the outer layer (1). The core portion (12) is formed by a thermal spray member (32) sprayed with a thermal spray material.
In the above embodiment, the outer diameter of the core intermediate portion (12b) located between the rolled portion and the shaft portion is smaller than the outer diameter of the rolled portion (11) and the shaft portion (12a) outside as in the first embodiment. It is formed larger than the diameter, and the core intermediate part (12b) is a step part (13), and a thermal spray member (32) is formed on this step part (13) to form an annular receiving part. Spray the core intermediate part (12b) with the same diameter as the outer diameter of the shaft part (12a) without changing the part (12b) to the step part (13). A member may be formed as an annular receiving portion.
溶射層(32)の層厚は、前記環状スリーブの肉厚に比べて薄く、約５〜５００μｍであり、その外径は、好適には、外層がワークロールとして使用される限界径である廃棄径よりも僅かに小さいだけであるから、芯材の上に限らず、外層(外層の余肉部又は中間層)の領域に形成することもできる。
環状受部を、溶射材の溶射によって形成する場合も、溶射層の硬度のバラツキは殆どなく、金属組織は微細で均一であるから、ロール支持部材によって支持される際、偏摩耗を生じ難い。
The layer thickness of the thermal spray layer (32) is about 5 to 500 μm, which is thinner than the wall thickness of the annular sleeve, and the outer diameter is preferably the limit diameter that the outer layer is used as a work roll. Since it is only slightly smaller than the diameter, it can be formed not only on the core material but also in the region of the outer layer (the surplus part of the outer layer or the intermediate layer).
Even when the annular receiving portion is formed by thermal spraying of the thermal spray material, there is almost no variation in the hardness of the thermal spray layer, and the metal structure is fine and uniform, so that it is difficult to cause uneven wear when supported by the roll support member.
溶射材、溶射条件の例は次の通りである。
組成がＷＣ：Ｃｏ＝８５：１５の超硬合金を、高速フレーム溶射により１００μｍの厚さの溶射皮膜を形成する。
Examples of thermal spray material and thermal spraying conditions are as follows.
A cemented carbide having a composition of WC: Co = 85: 15 is formed by a high-speed flame spraying to form a sprayed coating having a thickness of 100 μm.
超硬合金材の溶射材を芯材に溶射することによって環状受部を形成し、図４に示す如く溶射層を有する圧延用複合ロールを作製した。ロール胴部は、外径８１３ｍｍ、長さ２０５０ｍｍであり、ロール軸は全長５１０５ｍｍであり、外層は、層厚５５ｍｍ、使用層厚さ４２ｍｍである。溶射層は、外径６９５ｍｍ、層厚１００μｍ、硬度は、ビッカース硬さＨｖ１１００である。この圧延用ロールについて、外層の圧延面の研削作業を約３００回行なったが、環状受部に偏摩耗は殆んど生じなかった。 An annular receiving portion was formed by spraying a thermal spray material of a cemented carbide material onto a core material, and a composite roll for rolling having a thermal spray layer as shown in FIG. 4 was produced. The roll body portion has an outer diameter of 813 mm and a length of 2050 mm, the roll shaft has a total length of 5105 mm, and the outer layer has a layer thickness of 55 mm and a use layer thickness of 42 mm. The sprayed layer has an outer diameter of 695 mm, a layer thickness of 100 μm, and a hardness of Vickers hardness Hv1100. With respect to this rolling roll, grinding of the outer layer rolling surface was performed about 300 times, but there was almost no uneven wear in the annular receiving portion.
＜変形例＞
図５(ａ)、図５(ｂ)は、遠心鋳造により形成した外層(1)の内側に遠心鋳造により形成した中間層(6)を設け、中間層(6)の内側に静置鋳造により形成した芯材(2)を設けたロールの例を示している。
図５(a)の例は、芯材(2)により構成される芯部(12)に形成された段部(13)に環状受部(3)が形成された例を示している。
図５(b)の例は、中間層(6)により構成される芯部(12)に形成された段部(13)に環状受部(3)が形成された例を示している。
<Modification>
5 (a) and 5 (b) show that an intermediate layer (6) formed by centrifugal casting is provided inside the outer layer (1) formed by centrifugal casting, and the inner layer (6) is fixed by stationary casting. An example of a roll provided with the formed core material (2) is shown.
The example of Fig.5 (a) has shown the example by which the cyclic | annular receiving part (3) was formed in the step part (13) formed in the core part (12) comprised by the core material (2).
The example of FIG.5 (b) has shown the example by which the annular receiving part (3) was formed in the step part (13) formed in the core part (12) comprised by the intermediate | middle layer (6).
本発明の圧延用複合ロールは、圧延層の圧延面をロール研削機で研削を行なう際、ロール支持部材によって支持される環状受部が磨耗や偏摩耗を生じ難いので、ロール圧延面の研削を行ってもロール圧延使用時において必要とされるロール真円度を維持することができ、熱間又は冷間圧延用として好適に用いられる。 In the composite roll for rolling of the present invention, when the rolled surface of the rolled layer is ground with a roll grinder, the annular receiving portion supported by the roll support member is less likely to be worn or unevenly worn. Even if it performs, the roll roundness required at the time of roll rolling use can be maintained, and it is suitably used for hot or cold rolling.
(1) 外層
(2) 芯材
(3) 環状受部
(6) 中間層
(11) 圧延部
(12) 芯部
(12a) 軸部
(12b) 芯部中間部
(12c) 芯部中央部
(13) 段部
(30) 環状スリーブ
(32) 溶射層
(5) ロール支持部材
(1) Outer layer
(2) Core material
(3) Annular receiving part
(6) Middle layer
(11) Rolling part
(12) Core
(12a) Shaft
(12b) Middle part of core
(12c) Center of the core
(13) Step
(30) Annular sleeve
(32) Thermal spray layer
(5) Roll support member
Claims (6)
該芯部(12)は、軸受により回転可能に支持される軸部(12a)を圧延部(11)より軸方向外側に備え、軸方向において圧延部(11)と軸部(12a)との間に位置する芯部(12)には、ロール支持部材(5)によって支持される環状受部(3)を備え、
該環状受部(3)は、芯部(12)に設けられた鍛造材又は圧延材からなる部材(30)により形成され、
前記鍛造材又は圧延材からなる部材(30)は、圧延部(11)側の端部に、芯部(12)との間に空間が存するようにテーパ部(30a)が形成されていることを特徴とする圧延用複合ロール。 Includes rolling part having a rolling surface on the outer periphery (11), the core portion positioned axially outward from the radially inner and rolling of the rolling portion (11) (11) and (12),
The core portion (12) includes a shaft portion (12a) rotatably supported by a bearing on an axially outer side from the rolling portion (11) , and in the axial direction, the rolling portion (11) and the shaft portion (12a) The core portion (12) located between them includes an annular receiving portion (3) supported by a roll support member (5) ,
The annular receiving part (3) is formed by a member (30) made of a forged material or a rolled material provided in the core part (12) ,
The member (30) made of the forged material or the rolled material is formed with a tapered portion (30a) at the end on the rolled portion (11) side so that there is a space between the core portion (12). A composite roll for rolling.
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