JPH084919B2 - Casting method of composite roll for rolling excellent in abrasion resistance and surface roughening resistance - Google Patents
Casting method of composite roll for rolling excellent in abrasion resistance and surface roughening resistanceInfo
- Publication number
- JPH084919B2 JPH084919B2 JP62307759A JP30775987A JPH084919B2 JP H084919 B2 JPH084919 B2 JP H084919B2 JP 62307759 A JP62307759 A JP 62307759A JP 30775987 A JP30775987 A JP 30775987A JP H084919 B2 JPH084919 B2 JP H084919B2
- Authority
- JP
- Japan
- Prior art keywords
- core material
- roll
- mold
- resistance
- outer shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は芯材と外殻層材の化学組成が異なる複合ロー
ルの製造において、強靭な芯材を有し、かつ外殻層材と
芯材とが治金的に完全に接合され、かつ外殻層材質が強
靭化された圧延用複合ロールを鋳造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has a tough core material in the production of a composite roll in which the core material and the outer shell layer material have different chemical compositions, The present invention relates to a method for casting a composite roll for rolling in which the material is completely metallurgically bonded and the material of the outer shell layer is toughened.
薄鋼板の熱間圧延等に使用されるワークロールではロ
ール使用層に耐摩耗性および耐肌荒れ性が要求される。In a work roll used for hot rolling a thin steel sheet, the roll-use layer is required to have wear resistance and rough surface resistance.
耐摩耗性の観点からニハード鋳鉄系、高クロム鋳鉄系
の炭化物量の多い材料がロールの外殻層に使用されてい
る。From the viewpoint of wear resistance, materials having a large amount of carbide such as hard cast iron and high chromium cast iron are used for the outer shell layer of the roll.
従来は、ロールの材質選定において、耐摩耗性が重視
されていたが、圧延板の品質の高級化に伴い、耐肌荒れ
性が重視されるようになってきた。耐摩耗性はロール原
単位の向上のみならず、ロールチャンスフリー化を阻害
する局部摩耗を防止するため、ロールの耐摩耗性が必要
である。Conventionally, wear resistance has been emphasized in the selection of material for rolls, but as the quality of the rolled plate has become higher in quality, resistance to surface roughening has come to be emphasized. The wear resistance is required not only to improve the roll unit consumption but also to prevent the local wear that hinders the roll chance from becoming free, so that the wear resistance of the roll is required.
すなわち、ロールは耐摩耗性と耐肌荒れ性を同時に兼
ね備えている必要がある。That is, the roll needs to have both abrasion resistance and rough skin resistance at the same time.
耐肌荒れ性を向上させるためには、ロール材の靱性を
高める必要がある。一方、耐摩耗性を向上させるための
炭化物は、靱性を低下させる。従って、耐摩耗性と耐肌
荒れ性を同時に満足させることは非常に困難であった。In order to improve the resistance to rough skin, it is necessary to increase the toughness of the roll material. On the other hand, carbides for improving wear resistance reduce toughness. Therefore, it was very difficult to satisfy both abrasion resistance and rough skin resistance at the same time.
耐摩耗性および耐肌荒れ性を同時に満たすロール外殻
層を得る方法として、従来は、ロール鋳造時に鋳型を強
制冷却することによって、凝固組織の微細化を図り、共
昌炭化物を小さくして、前述の要求特性を満たす方法が
あった。しかし、鋳型冷却による凝固組織微細化は鋳型
に近い部分では満足されるが、鋳型から離れるにつれて
凝固組織微細化の程度は低下する。従ってロール使用層
全域において、前述の要求特性を満たすことはできな
い。As a method of obtaining a roll outer shell layer that simultaneously satisfies abrasion resistance and surface roughening resistance, conventionally, by forcibly cooling the mold during roll casting, the solidification structure is miniaturized, and Kyochang carbide is reduced, There was a method to meet the required characteristics of. However, although the solidification structure refining by cooling the mold is satisfied in the portion close to the mold, the degree of the solidification structure miniaturization decreases as the mold is separated. Therefore, the above-mentioned required characteristics cannot be satisfied in the entire roll use layer.
本発明者は強靱な芯材を有し、かつ外殻層を強靱化し
たロールを製造する方法として、特願昭62−147000にお
いて、先に芯材を作り、その周囲に治金的に接合した優
れた耐摩耗性および肌荒れ性を合わせもつ外殻層を形成
する方法を提案した。As a method for producing a roll having a tough core material and having a tough outer shell layer, the present inventor discloses in Japanese Patent Application No. 62-147000 that a core material is first formed and metallurgically bonded around the core material. A method of forming an outer shell layer having both excellent wear resistance and rough skin resistance was proposed.
その方法は回転自在なロール鋳型内に芯材を同心に回
転自在に保持し鋳型と芯材を回転させながら、鋳型内に
溶湯を注入してロールの外殻層を鋳造するものである。In the method, a core material is rotatably held concentrically in a rotatable roll mold, and while the mold and the core material are rotated, a molten metal is injected into the mold to cast an outer shell layer of the roll.
本発明は上記提案をさらに発展させ、ロールの使用層
の全域において、耐摩耗性および耐肌荒れ性の両方を具
備すべく、必要な炭化物量と靱性を兼ね備えた外殻層を
有する耐摩耗性および肌荒れ性に優れた圧延用複合ロー
ルの鋳造方法を提供することを目的とする。The present invention is a further development of the above proposal, in which the wear resistance and the outer shell layer having the required amount of carbides and toughness are provided in order to provide both wear resistance and surface roughening resistance in the entire use layer of the roll. An object of the present invention is to provide a method for casting a composite roll for rolling, which is excellent in rough skin property.
本発明は上記問題点解決の技術的手段として、回転自
在なロール鋳型内に、該鋳型の回転軸心に対する偏心量
が調整自在な芯材を回転自在に保持し、注湯開始から注
湯完了までの間においては、前記偏心量をゼロとした状
態で、また、注湯完了直後から注入した溶湯が半溶融状
態となる凝固末期までの間は、前記偏心量をゼロでない
正の値とした状態で前記鋳型と前記芯材とを同方向に回
転させてロールの外殻層を鋳造し前記芯材を鋳ぐるむこ
とを特徴とする耐摩耗性および耐肌荒れ性に優れた圧延
用複合ロールの鋳造方法である。As a technical means for solving the above problems, the present invention rotatably holds a core material whose eccentricity is adjustable with respect to the rotational axis of the mold in a rotatable roll mold, and from the start of pouring to the completion of pouring. In the state until the eccentricity amount is zero, and until the end of solidification in which the injected molten metal is in a semi-molten state immediately after the pouring is completed, the eccentricity amount is a positive value other than zero. In the state, the mold and the core material are rotated in the same direction to cast the outer shell layer of the roll, and the core material is cast around the composite material for rolling excellent in wear resistance and rough surface resistance. This is the casting method.
本発明では、芯材を予め製作しておき、これを外殻層
溶湯で鋳ぐるむもので、外殻層の鋳造組織を微細にする
ため、芯材を鋳型に対して偏心運動させ、ロールの外殻
層をいわば溶湯によって鍛造するような作用によって、
鋳造組織の微細な外殻層を備えた複合ロールの製造を可
能とするものである。In the present invention, a core material is manufactured in advance, and is cast in the outer shell layer molten metal. To make the outer shell layer casting structure fine, the core material is eccentrically moved with respect to the mold, By the action of forging the outer shell layer with a kind of molten metal,
This makes it possible to manufacture a composite roll having a fine outer shell layer having a cast structure.
本発明の構成と作用を第１図を参照しながらさらに詳
細に説明する。The structure and operation of the present invention will be described in more detail with reference to FIG.
外殻層を鋳造するための円筒状の鋳型１を駆動系を有
するローラ４で回転させる。 鋳型１の内部に芯材２を
配設し、鋳型１の回転軸心に対する芯材２の回転軸心の
偏心量を自在に変えられる機能を備えた芯材回転装置
５、5aにより芯材２を回転させる。A cylindrical mold 1 for casting the outer shell layer is rotated by a roller 4 having a drive system. The core material 2 is disposed inside the mold 1, and the core material rotating device 5 or 5a having a function of freely changing the eccentric amount of the rotation axis of the core material 2 with respect to the rotation axis of the mold 1 is used. To rotate.
外殻層の鋳造に当っては、芯材２と鋳型１との間隙
に、図示しない注入管を介して、外殻層溶湯３を必要量
注入する。注湯開始から注湯完了までの間は溶湯が鋳型
１からこぼれるのを防止するため、芯材２と鋳型１の回
転は、方向と速度を一致させ、偏心量をゼロとした状態
で回転させる。When casting the outer shell layer, the required amount of the outer shell layer molten metal 3 is injected into the gap between the core material 2 and the mold 1 via an injection pipe (not shown). In order to prevent the molten metal from spilling from the casting mold 1 from the start of pouring to the completion of pouring, the rotation of the core material 2 and the casting mold 1 is made to rotate in a state where the direction and speed match and the eccentricity is zero. .
外殻層溶湯３は注湯直後から、鋳型１および芯材２と
の接触面から凝固を開始する。この状態で凝固が進行す
ると通常の遠心鋳造で得られる凝固組織となるが、注湯
完了直後から芯材２の回転軸心を鋳型１の回転軸心に対
して偏心させることによって、外殻層溶湯３の内部に溶
湯流および不均一な圧力分布が生じる。その結果、凝固
中のデンドライトが折れて、溶湯中に浮遊し、細かな等
軸晶を形成する核になる。凝固末期においては、半溶融
状態における鍛造効果のために、巨大な共晶炭化物の破
壊が起き、組織の微細化が図られる。Immediately after pouring, the outer shell layer molten metal 3 starts to solidify from the contact surface with the mold 1 and the core material 2. When solidification proceeds in this state, a solidified structure obtained by normal centrifugal casting is obtained. However, immediately after the completion of pouring, the rotation axis of the core material 2 is eccentric with respect to the rotation axis of the mold 1, so that the outer shell layer Inside the molten metal 3, a molten metal flow and a non-uniform pressure distribution occur. As a result, the dendrites during solidification break and float in the molten metal, forming nuclei that form fine equiaxed crystals. At the end of solidification, a huge eutectic carbide is destroyed due to the forging effect in the semi-molten state, and the structure is refined.
本発明で得られた組織は、炭化物量を低減させること
なく微細化されているため、硬さと靱性を備えている。
従って、ロールとして要求される耐摩耗性、耐肌荒れ性
の両方の特性に優れている。The structure obtained by the present invention is refined without reducing the amount of carbide, and thus has hardness and toughness.
Therefore, it is excellent in both the abrasion resistance and the rough skin resistance required for the roll.
溶湯鍛造に伴う溶湯移動および凝固収縮に伴う溶湯補
給のために十分な押湯が必要になる。本発明では、押湯
部を保温するため、鋳型１、芯材２の押湯部との接触部
に保温材６を設置した。Sufficient riser is required to move the molten metal during the forging of molten metal and to replenish the molten metal due to solidification shrinkage. In the present invention, in order to keep the riser portion warm, the heat retaining material 6 is provided at the contact portion between the casting mold 1 and the core material 2 with the riser portion.
本発明による具体的実施列として、外殻層にニッケル
グレン鋳鉄を用い、芯材に球状黒鉛鋳鉄を用いた複合ロ
ールに本発明を適用した結果を述べる。As a concrete embodiment of the present invention, the results of applying the present invention to a composite roll using nickel-grain cast iron for the outer shell layer and spheroidal graphite cast iron for the core material will be described.
実施例の外殻層および芯材の化学組成を第１表に示し
た。The chemical compositions of the outer shell layer and the core material of the examples are shown in Table 1.
ロールのサイズは胴径φ780mm、胴長2100mm、全長490
0mm、目標外殻層厚80mmである。 Roll size is φ780mm, body length 2100mm, total length 490
The target outer shell layer thickness is 0 mm and 0 mm.
予め鋳造した球状黒鉛鋳鉄の芯材を胴径φ630mmに加
工し、鋳型内の所定位置にセットした。A core material of spheroidal graphite cast iron cast in advance was processed into a body diameter of φ630 mm and set at a predetermined position in the mold.
外殻層溶湯約3.7tを温度1350℃で回転している鋳型内
に鋳込んだ。About 3.7 t of molten metal for the outer shell layer was cast in a mold rotating at a temperature of 1350 ° C.
鋳込時の鋳型および芯材の回転数は650rpm（約130
G）、芯材の偏心量は、注湯開始から柱湯完了までの間
は0mmとした。鋳型と芯材の回転方向は同じ方向であ
る。鋳込完了直後から、芯材を鋳型の回転中心に対して
1mm偏心させて回転した。The rotation speed of the mold and core during casting is 650 rpm (about 130
G), the amount of eccentricity of the core material was 0 mm from the start of pouring to the completion of pillar water. The mold and the core material rotate in the same direction. Immediately after the casting is completed, the core material is
It was rotated with eccentricity of 1 mm.
凝固の進行につれて、芯材のトルクが上昇するため、
芯材トルクが50kgfmを越えないよう、偏心量を小さくす
る制御を行った。As the solidification progresses, the torque of the core increases,
The eccentricity was controlled so that the core torque did not exceed 50 kgfm.
本発明を適用した実施例で得られたロールは、硬さHs
が79、引張強さ42kgf/mm2、伸び1.4％であった。従来法
で鋳造された比較ロールでは、硬さHs80、引張強さ40kg
f/mm2、伸び0.5％であった。従って、本発明を適用した
実施例では硬さを低下させることなく、靱性（伸び値で
評価）の向上が図られている。The roll obtained in the example to which the present invention is applied has a hardness Hs
Was 79, the tensile strength was 42 kgf / mm 2 , and the elongation was 1.4%. The comparison roll cast by the conventional method has a hardness of Hs80 and a tensile strength of 40 kg.
It was f / mm 2 and elongation 0.5%. Therefore, in the examples to which the present invention is applied, the toughness (evaluated by the elongation value) is improved without lowering the hardness.
以上のように本発明の複合ロール鋳造方法によれば、
次の効果がある。According to the composite roll casting method of the present invention as described above,
It has the following effects.
１）外殻層の硬さを損なうことなく、外殻層の靱性を向
上させることができ、耐摩耗性、耐肌荒れ性が共に優れ
たロールを容易に製造することができる。1) The toughness of the outer shell layer can be improved without impairing the hardness of the outer shell layer, and a roll excellent in both abrasion resistance and rough skin resistance can be easily manufactured.
２）芯材と外殻層を治金的に強固に接合することができ
る。2) The core material and the outer shell layer can be firmly joined together by metallurgy.
３）芯材に外殻層と異った強靱な材料を使用することが
できる。3) A tough material different from the outer shell layer can be used for the core material.
第１図は本発明を好適に実施するための装置の断面図で
ある。 １……鋳型 ２……芯材 ３……外殻層溶湯 ４……ローラ ５……芯材回転装置 ６……保温材FIG. 1 is a sectional view of an apparatus for carrying out the present invention. 1 ... Mold 2 ... Core material 3 ... Molten shell layer 4 ... Roller 5 ... Core material rotating device 6 ... Heat insulating material
Claims (1)
軸心に対する偏心量が調整自在な芯材を回転自在に保持
し、注湯開始から注湯完了までの間においては、前記偏
心量をゼロとした状態で、また、注湯完了直後から注入
した溶湯が半溶融状態となる凝固末期までの間は、前記
偏心量をゼロでない正の値とした状態で前記鋳型と前記
芯材とを同方向に回転させてロールの外殻層を鋳造し前
記芯材を鋳ぐるむことを特徴とする耐摩耗性および耐肌
荒れ性に優れた圧延用複合ロールの鋳造方法。1. A rotative roll mold holds a rotatably core member whose eccentricity is adjustable with respect to the rotation axis of the mold, and the eccentricity is maintained between the start of pouring and the completion of pouring. In the state where the amount is zero, and until the end of solidification when the injected molten metal becomes a semi-molten state immediately after the pouring is completed, the eccentric amount is a positive value other than zero and the mold and the core material Is rotated in the same direction to cast the outer shell layer of the roll, and the core material is cast around the core material. A method for casting a rolling roll having excellent wear resistance and surface roughening resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62307759A JPH084919B2 (en) | 1987-12-07 | 1987-12-07 | Casting method of composite roll for rolling excellent in abrasion resistance and surface roughening resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62307759A JPH084919B2 (en) | 1987-12-07 | 1987-12-07 | Casting method of composite roll for rolling excellent in abrasion resistance and surface roughening resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01150460A JPH01150460A (en) | 1989-06-13 |
| JPH084919B2 true JPH084919B2 (en) | 1996-01-24 |
Family
ID=17972933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62307759A Expired - Fee Related JPH084919B2 (en) | 1987-12-07 | 1987-12-07 | Casting method of composite roll for rolling excellent in abrasion resistance and surface roughening resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084919B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920864A (en) * | 2014-04-25 | 2014-07-16 | 安岳县金龙机械制造有限公司 | Composite casting grinding roller machining device and machining technology of composite casting grinding roller |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109590444B (en) * | 2019-01-07 | 2020-12-01 | 肇庆华信高精密机械有限公司 | Centrifugal casting equipment for hydraulic cylinder body |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55133860A (en) * | 1979-04-06 | 1980-10-18 | Kubota Ltd | Centrifugal casting method |
-
1987
- 1987-12-07 JP JP62307759A patent/JPH084919B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920864A (en) * | 2014-04-25 | 2014-07-16 | 安岳县金龙机械制造有限公司 | Composite casting grinding roller machining device and machining technology of composite casting grinding roller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01150460A (en) | 1989-06-13 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |