JPH0718395A - Roll bearing - Google Patents
Roll bearingInfo
- Publication number
- JPH0718395A JPH0718395A JP5189113A JP18911393A JPH0718395A JP H0718395 A JPH0718395 A JP H0718395A JP 5189113 A JP5189113 A JP 5189113A JP 18911393 A JP18911393 A JP 18911393A JP H0718395 A JPH0718395 A JP H0718395A
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- bearing
- stainless steel
- roll
- roll bearing
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
- F16C13/02—Bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/30—Coating surfaces
- F16C2223/70—Coating surfaces by electroplating or electrolytic coating, e.g. anodising, galvanising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
Landscapes
- Rolls And Other Rotary Bodies (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼板の溶融金属メッキ
装置で使用する浴中ロール軸受に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a in-bath roll bearing used in a molten metal plating apparatus for steel sheets.
【０００２】[0002]
【従来の技術】連続溶融金属メッキ装置の構成を第５図
に示す。加熱炉１２で加熱焼鈍された鋼板１３を、溶融
金属槽１４に導き、鋼板１３へ溶融金属１５をメッキ
し、シンクロール１６およびガイドロール１７を介し
て、これを引き上げ、連続的に金属メッキ鋼板１８を得
る方法が行なわれている。シンクロール１６の構造を第
６図（ａ），（ｂ），（ｃ）に示すが、シンクロール軸
受の固定部材１９は、半割りの円筒または平板の形状を
しており、回転側部材２０は、ロール軸に嵌合された円
筒スリーブまたはロール軸である。ロール軸受であるこ
れら固定側部材および回転側部材には、耐食性の良好な
ステンレス鋼が一般に使用されている。ステンレス鋼
は、溶融金属との反応性が小さく、耐食性は良好である
が、耐摩耗性の面では十分とはいえず、寿命は１０日〜
２０日程度と短い。軸受部材の摩耗が進行すると、鋼板
にばた付き等が発生するため溶融金属メッキ浴中から引
き上げ、軸受部材を交換しなければならないが、溶融金
属メッキ浴中に浸潰されているロール等の部品は、一体
となっているフレーム２１に取り付けられているため、
軸受部材が摩耗すると、ロールには異常がなくとも、生
産を停止し溶融金属メッキ浴中に浸潰されている部品全
体を一括で交換しなければならず、操業上の損失はきわ
めて大きい。2. Description of the Related Art The construction of a continuous hot-dip metal plating apparatus is shown in FIG. The steel plate 13 heated and annealed in the heating furnace 12 is introduced into the molten metal tank 14, the molten metal 15 is plated on the steel plate 13, and the molten metal 15 is pulled up through the sink roll 16 and the guide roll 17 to continuously and continuously plate the metal plated steel plate. The method of obtaining 18 is carried out. The structure of the sink roll 16 is shown in FIGS. 6 (a), (b), and (c), but the fixing member 19 of the sink roll bearing is in the shape of a half cylinder or a flat plate, and the rotating side member 20. Is a cylindrical sleeve or roll shaft fitted to the roll shaft. Stainless steel, which has good corrosion resistance, is generally used for the stationary member and the rotating member that are roll bearings. Stainless steel has low reactivity with molten metal and good corrosion resistance, but is not sufficient in terms of wear resistance and has a life of 10 days to
It is as short as 20 days. As the wear of the bearing member progresses, fluttering occurs on the steel plate, so it is necessary to pull up from the molten metal plating bath and replace the bearing member. Since the parts are attached to the integrated frame 21,
When the bearing member wears, even if there is no abnormality in the roll, production must be stopped and all the parts immersed in the molten metal plating bath must be replaced in a lump, and the operational loss is extremely large.
【０００３】かかる浴中ロールの軸受部材の耐摩耗性を
改善するために、従来からステンレル鋼表面に硬質合金
を溶射したものが使用されており、さらに、この硬質金
属に代わってセラミックスを溶射したものが種々提案さ
れている。ところが、この溶射によって形成される被覆
層は、熱応力により被覆層に剥離が生じるため、例えば
被覆層の厚みは１〜２ｍｍが限界であり、厚く形成でき
ず、したがってその耐用性に自から限界がある。In order to improve the wear resistance of the bearing member of such a roll in a bath, a hard alloy is thermally sprayed on the surface of stainless steel, and a ceramic is sprayed instead of the hard metal. Various things have been proposed. However, in the coating layer formed by this thermal spraying, peeling occurs in the coating layer due to thermal stress. Therefore, the thickness of the coating layer is limited to 1 to 2 mm, and it cannot be formed thick, and therefore its durability is limited by itself. There is.
【０００４】この溶射によって形成される被覆層の厚み
の限界による問題を解消するために、特開平３−９４９
８４号公報には、軸受母材の表面にＣｏ基合金と炭化物
との混合粉末を複合的に溶接溶融肉盛（ＰＴＡ）するこ
とが提案されている。これによって、形成された被覆層
は厚く形成でき、しかも、被覆層も緻密でめっき浴に対
する耐食性と耐摩耗性は良好であり、特に耐摩耗性は、
上記従来の溶射皮膜によるものより、格段に優れた効果
を発揮するものとされている。In order to solve the problem due to the limit of the thickness of the coating layer formed by this thermal spraying, JP-A-3-949 has been published.
In Japanese Patent Publication No. 84, it is proposed that a mixed powder of Co-based alloy and carbide is compositely welded and welded (PTA) on the surface of a bearing base material. As a result, the formed coating layer can be formed thick, and the coating layer is also dense and has good corrosion resistance and wear resistance to the plating bath, and especially wear resistance is
It is said that it exerts a markedly superior effect as compared with the conventional thermal spray coating.
【０００５】しかしながら、この複合肉盛溶着によって
形成された被覆層を有する軸受においても、多層肉盛の
形成過程で発生する割れのために自ら厚みに制限があっ
て、寿命が期待された程ではなく、さらに、残留応力が
大きく使用中に表面にクラックが発生してスポーリング
が起こりやすい等の問題が指摘されている。However, even in the bearing having the coating layer formed by the composite overlay welding, the thickness of the bearing itself is limited due to the cracks generated during the process of forming the multilayer overlay, and the life is not so long as expected. Furthermore, it has been pointed out that the residual stress is large and cracks are easily generated on the surface during use to easily cause spalling.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、従来
の溶融肉盛被覆層と同等以上の耐食性を維持しつつ耐摩
耗性をさらに改善した被覆層を有するロール軸受を提供
することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll bearing having a coating layer which has further improved wear resistance while maintaining corrosion resistance equal to or higher than that of a conventional melt overlay coating layer. .
【０００７】[0007]
【課題を解決するための手段】本発明に係る鋼板の溶融
メッキ浴中に浸潰して使用されるロール軸受は、ステン
レス鋼からなる軸受基材の外表面又は内表面に、熱間等
方圧加圧により形成されたＣｏ基合金からなる焼結被覆
層を有することを特徴とする。A roll bearing used by immersing a steel sheet in a hot dip plating bath according to the present invention has a hot isotropic pressure on the outer or inner surface of a bearing base made of stainless steel. It is characterized by having a sintered coating layer made of a Co-based alloy formed by pressurization.
【０００８】また、耐食性と耐摩耗性を有する被覆材と
して、ＷＣ，Ｃｒ3 Ｃ2 ，ＴｉＣなどの炭化物を４０重
量％未満含有するＣｏ基合金の粉末を用いることができ
る。ここで前記、炭化物の量が４０重量％以上では、強
度及び靭性低下により製造時に割損がおきやすいため、
４０重量％未満が好ましい。さらに、この被覆層は、軸
受の軸方向に環状に分割して形成することによって軸方
向残留応力を低減でき、使用中、被覆層の耐スポーリン
グ性を高める。As a coating material having corrosion resistance and wear resistance, powder of Co-based alloy containing less than 40% by weight of carbide such as WC, Cr 3 C 2 and TiC can be used. Here, when the amount of the carbides is 40% by weight or more, cracking is likely to occur during manufacturing due to deterioration in strength and toughness.
It is preferably less than 40% by weight. Furthermore, this coating layer can reduce the residual stress in the axial direction by forming the coating layer in a ring shape in the axial direction of the bearing, and enhances the spalling resistance of the coating layer during use.
【０００９】[0009]
【作用】被覆層は、粉末の熱間等方圧加圧により作成さ
れた固相焼結材特有の微細組織を有する高硬度、且つ高
強度のものが得られ、摩耗しにくいものとなる。さら
に、熱間等方圧加圧の適用によって、焼結材被覆層は厚
く形成できるため、摩耗寿命が長い。The coating layer has high hardness and high strength and has a fine structure peculiar to the solid-phase sintered material produced by hot isostatic pressing of powder, and is less likely to wear. Further, by applying hot isostatic pressing, the sintered material coating layer can be formed thick, so that the wear life is long.
【００１０】とくに、溶融めっき浴の浴中ロール軸受の
硬質被覆層として、Ｃｏ基合金を使用し軸受基材にオー
ステナイト系以外（フェライト，マルテンサイト，２相
ステンレス）のステンレス鋼を使用した場合、該被覆層
と熱膨張係数が近似するので、残留応力を下げることが
できる。この残留応力は、図３に示すとおり、被覆層を
軸方向に分割した構造とすることにより、さらに低減で
きる。In particular, when a Co-based alloy is used as the hard coating layer of the roll bearing in the bath of the hot dipping bath and stainless steel other than austenite (ferrite, martensite, duplex stainless steel) is used as the bearing base, Since the thermal expansion coefficient is close to that of the coating layer, the residual stress can be reduced. This residual stress can be further reduced by using a structure in which the coating layer is divided in the axial direction as shown in FIG.
【００１１】[0011]
【実施例】以下、本発明を溶融亜鉛めっき浴中で使用す
るロールの軸受に適用した実施例について説明する。EXAMPLES Examples of applying the present invention to bearings of rolls used in a hot dip galvanizing bath will be described below.
【００１２】実施例１ 図１は、マルテンサイト系ステンレス鋼であるＳＵＳ４
１０からなる回転側軸受部材１の外周の摺動面２全面に
硬質材料として、ステライト系のＣｏ基合金粉末を熱間
等方圧加圧（ＨＩＰ）によって被覆層３を形成した例を
示す。熱間等方圧加圧処理は、以下の要領で行った。平
均粒度８０μｍの原料合金粉末を公知のカプセル封入法
を用いて真空封入し、これを、１０００〜１２００℃×
１００〜２００ＭＰａ×１〜４時間保持するＨＩＰ処理
を行なった。その結果、８ｍｍ厚の被覆層を形成した。
それぞれの被覆層の密度は、理論密度に対して、９９．
９％以上の密度を有するもので、それぞれの特性を表１
と表２に示す。併せて、従来の溶融肉盛によって形成し
た同一厚みの被覆層の特性を示す。Example 1 FIG. 1 shows SUS4 which is a martensitic stainless steel.
An example in which a covering layer 3 is formed by hot isostatic pressing (HIP) of stellite-based Co-based alloy powder as a hard material on the entire sliding surface 2 on the outer circumference of the rotating side bearing member 1 made of 10 will be described. The hot isostatic pressing process was performed as follows. A raw material alloy powder having an average particle size of 80 μm is vacuum-encapsulated using a known encapsulation method, and this is 1000 to 1200 ° C.
HIP treatment was carried out for 100 to 200 MPa × 1 to 4 hours. As a result, a coating layer having a thickness of 8 mm was formed.
The density of each coating layer is 99.
It has a density of 9% or more, and its characteristics are shown in Table 1.
Is shown in Table 2. In addition, the characteristics of the coating layer having the same thickness formed by the conventional melt overlay are shown.
【００１３】[0013]
【表１】 [Table 1]
【００１４】表１の結果から明らかなように、同一成分
であっても製造方法をＰＴＡからＨＩＰ焼結法とするこ
とにより、硬度が著しく向上することから耐摩耗性が改
善できる。また、材料強度も向上することから、耐スポ
ーリング性が改善できる。（比較例１と実施例１，比較
例２と実施例４の比較）。これは、図２に示す様にＨＩ
Ｐ焼結にすることにより組織が微細化するためである。
図４に比較例１と実施例１及び実施例６の実機使用時の
摩耗評価結果を示す。図３から明らかなように、本発明
軸受により寿命が大幅に改善された。また、図２
（ａ），（ｂ），（ｃ）は、それぞれ、本発明に係るＨ
ＩＰ処理によって形成された被覆層の顕微鏡写真を示
し、同図（ｄ），（ｅ）は、従来の溶融肉盛によって形
成された被覆層の顕微鏡写真を示す。この比較写真か
ら、本願発明において、組織の微細化が図られているこ
とが明らかである。As is clear from the results shown in Table 1, by changing the manufacturing method from PTA to HIP sintering even with the same components, the hardness is remarkably improved and the wear resistance can be improved. Further, since the material strength is also improved, the spalling resistance can be improved. (Comparative Example 1 and Example 1, Comparative Example 2 and Example 4). This is HI as shown in FIG.
This is because the P-sintering makes the structure finer.
FIG. 4 shows the results of wear evaluation of Comparative Example 1 and Examples 1 and 6 when the actual machine was used. As is clear from FIG. 3, the bearing of the present invention has significantly improved the life. Also, FIG.
(A), (b), (c) are respectively H according to the present invention.
The microscope picture of the coating layer formed by IP processing is shown, and the same figure (d) and (e) shows the microscope picture of the coating layer formed by the conventional melt overlay. From this comparative photograph, it is clear that the structure of the present invention has been refined.
【００１５】実施例２ 図３は、回転側軸受部材１の中央部分に間隙を有する中
間堰５を形成して、被覆層を２つの分割被覆層３１，３
２として形成した例を示す。これによって、それぞれの
被覆層３１，３２の長さは短かくなり、被覆層内の残留
歪みは減少し、スポーリングを起こしにくくなり、その
耐用寿命をさらに延長できる。この２分割とすることに
より軸方向残留応力は２５％低減された。また、中間堰
５の中央部に形成された間隙は、溶融亜鉛が十分流動す
るための溝として機能せしめることができる。これらの
効果は固定側軸受においても同様の効果が得られる。Embodiment 2 In FIG. 3, an intermediate weir 5 having a gap is formed in the central portion of the rotary side bearing member 1, and the covering layer is divided into two divided covering layers 31, 3.
An example formed as No. 2 will be shown. As a result, the length of each coating layer 31, 32 becomes short, the residual strain in the coating layer is reduced, spalling is less likely to occur, and the service life thereof can be further extended. By dividing into two, the residual stress in the axial direction was reduced by 25%. Further, the gap formed in the central portion of the intermediate weir 5 can function as a groove for allowing the molten zinc to flow sufficiently. These effects can be obtained also in the fixed side bearing.
【００１６】[0016]
【発明の効果】本発明によって以下の効果を奏する。 （１）被覆層を形成する被覆材そのものが有する耐食性
を何等低下させることなく、耐摩耗性を向上させる。 （２）緻密な被覆層を厚く形成できるので、寿命延長が
達成できる。 （３）被覆層そのものの残留応力が低減し、クラックの
発生が防止でき、安定性が改善される。The present invention has the following effects. (1) The wear resistance is improved without lowering the corrosion resistance of the coating material forming the coating layer itself. (2) Since the dense coating layer can be formed thick, the life can be extended. (3) The residual stress of the coating layer itself is reduced, the occurrence of cracks can be prevented, and the stability is improved.
【図１】 本発明の第１の実施例を示す。FIG. 1 shows a first embodiment of the present invention.
【図２】 本発明によって形成された被覆層の金属組織
を、溶融肉盛法により形成された被覆層と比較して示
す。FIG. 2 shows a metallographic structure of a coating layer formed according to the present invention in comparison with a coating layer formed by a melt overlay method.
【図３】 本発明の第２の実施例を示す。FIG. 3 shows a second embodiment of the present invention.
【図４】 本発明及び従来材の実機使用結果を示す。FIG. 4 shows the results of actual use of the present invention and conventional materials.
【図５】 連続溶融金属メッキ装置の装置構成を示す。FIG. 5 shows a device configuration of a continuous molten metal plating device.
【図６】 同上設備のシンクロールの軸受構造を示す。FIG. 6 shows a bearing structure of a sink roll of the above equipment.
１ 軸受部材（スリーブ） ２ 鋼板搬送面 ３ 被覆層 ３１，３２ 分割被覆層 ４ 堰 ５ 中間堰 DESCRIPTION OF SYMBOLS 1 Bearing member (sleeve) 2 Steel plate conveyance surface 3 Coating layer 31, 32 Division coating layer 4 Weir 5 Intermediate weir
Claims (2)
クロール端部に嵌合された円筒状のステンレス鋼のスリ
ーブおよび該スリーブに当接して配設されたステンレス
鋼の固定部材から構成されるロール軸受において、前記
スリーブの外表面および固定部材の内表面にＣｏ基合金
からなる被覆層を形成したことを特徴とするロール軸
受。1. A cylindrical stainless steel sleeve fitted to the end of a sink roll to be immersed in a hot-dip galvanizing bath of a steel plate, and a stainless steel fixing member arranged in contact with the sleeve. A roll bearing according to claim 1, wherein a coating layer made of a Co-based alloy is formed on the outer surface of the sleeve and the inner surface of the fixing member.
らなる焼結被覆層が４０重量％未満の炭化物を含有する
ロール軸受。2. The roll bearing according to claim 1, wherein the sintered coating layer made of a Co-based alloy contains less than 40% by weight of carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5189113A JP2902542B2 (en) | 1993-06-30 | 1993-06-30 | Roll bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5189113A JP2902542B2 (en) | 1993-06-30 | 1993-06-30 | Roll bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0718395A true JPH0718395A (en) | 1995-01-20 |
| JP2902542B2 JP2902542B2 (en) | 1999-06-07 |
Family
ID=16235602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5189113A Expired - Fee Related JP2902542B2 (en) | 1993-06-30 | 1993-06-30 | Roll bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2902542B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310745A (en) * | 2001-04-06 | 2002-10-23 | Ricoh Elemex Corp | Double box tangential flow impeller water meter |
| EP1757710A1 (en) * | 2005-08-23 | 2007-02-28 | Sulzer Metco Coatings GmbH | Workpiece with a thermal sprayed coating layer |
| DE112008001304T5 (en) | 2007-06-01 | 2010-03-11 | Toyota Jidosha Kabushiki Kaisha, Toyota-shi | Ignition timing control device for an internal combustion engine |
-
1993
- 1993-06-30 JP JP5189113A patent/JP2902542B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310745A (en) * | 2001-04-06 | 2002-10-23 | Ricoh Elemex Corp | Double box tangential flow impeller water meter |
| EP1757710A1 (en) * | 2005-08-23 | 2007-02-28 | Sulzer Metco Coatings GmbH | Workpiece with a thermal sprayed coating layer |
| DE112008001304T5 (en) | 2007-06-01 | 2010-03-11 | Toyota Jidosha Kabushiki Kaisha, Toyota-shi | Ignition timing control device for an internal combustion engine |
| US8459230B2 (en) | 2007-06-01 | 2013-06-11 | Toyota Jidosha Kabushiki Kaisha | Ignition timing control apparatus for internal combustion engine |
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| JP2902542B2 (en) | 1999-06-07 |
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