JPH11309596A - Reproducing method of consumable member vertical roll mill - Google Patents
Reproducing method of consumable member vertical roll millInfo
- Publication number
- JPH11309596A JPH11309596A JP10131364A JP13136498A JPH11309596A JP H11309596 A JPH11309596 A JP H11309596A JP 10131364 A JP10131364 A JP 10131364A JP 13136498 A JP13136498 A JP 13136498A JP H11309596 A JPH11309596 A JP H11309596A
- Authority
- JP
- Japan
- Prior art keywords
- roll mill
- welding
- layer
- vertical roll
- build
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/004—Shape or construction of rollers or balls
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は竪型ロールミルの消
耗部材、とくにテーブル、ロールの摩耗退入後の再生方
法に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumable member for a vertical roll mill, and more particularly, to a method for regenerating a table or a roll after a roll is worn out.
【０００２】[0002]
【従来の技術】竪型ロールミルは多岐に亘る工業分野、
たとえば石炭火力発電用の石炭微粉砕やセメント原料用
の石灰石、クリンカーの微粉砕に使用されている。竪型
ロールミルの粉砕原理は図５に略示するように、粉砕室
Ｒ内に回転自在に据え付けられたテーブル１の上面へ自
ら転動可能にロール２を吊支し、ロール２はジャーナル
アッセンブリー３によって室内で傾動自在に保持されて
いるが、この図の例では油圧シリンダ３１が基盤Ｂとジ
ャーナルアッセンブリー３とを結んで取り付けられ、油
圧シリンダ３１の伸縮によってピボットピン３２を軸と
して回動し、ジャーナルアッセンブリー３に軸支された
ロール２も共動きする。被砕物は粉砕室の上部よりチャ
―ジされてテ―ブル１の中央から遠心力によって外周へ
寄せられ、ロ―ル２とテ―ブル１間の粉砕空間Ｃ内でで
圧下摺動されて粉化して外側へ押出される型式が一般で
ある。2. Description of the Related Art Vertical roll mills are used in a wide variety of industrial fields,
For example, it is used for pulverizing coal for coal-fired power generation, limestone for cement raw materials, and clinker. As shown in FIG. 5, the grinding principle of the vertical roll mill is such that a roll 2 is rotatably supported on an upper surface of a table 1 rotatably mounted in a grinding chamber R, and the roll 2 is a journal assembly 3. In this example, the hydraulic cylinder 31 is attached by connecting the base B and the journal assembly 3, and the hydraulic cylinder 31 rotates around the pivot pin 32 as the hydraulic cylinder 31 expands and contracts. The roll 2 supported by the journal assembly 3 also moves together. The material to be crushed is charged from the upper part of the crushing chamber, brought to the outer periphery from the center of the table 1 by centrifugal force, and slid under pressure in the crushing space C between the roll 2 and the table 1. The type which is powdered and extruded outward is generally used.
【０００３】粉砕空間Ｃはテーブル１とロール２との対
向する隙間によって形成される。両部材が新品のときに
は図６（Ａ）のように粗粉を受入れる始端に相当するミ
ルセンター側（図の右側）の隙間Ｓ1が最も広くなるよ
うに異なる曲率の円弧が描く軌跡によって隙間は次第に
縮小し、ロール２の最大直径であるロール中心線２１と
テーブル１が対向するテーブル対向線１１における隙間
Ｓ2では、始端の隙間Ｓ1のほぼ半分以下に縮まり、テー
ブル１とロール２とはそのままほぼ同一曲率の円弧面で
対向して隙間Ｓ2とほぼ等しい隙間Ｓ3を保って粉砕空間
終端で開口する。このような粉砕空間Ｃの設定が最も粉
砕効率が高く粉砕コストが極小になることが知られてい
る。すなわち粉砕空間Ｃの始端から粗粉が隙間Ｓ1 内へ
噛み込まれて微粉に粉砕されて終端の隙間Ｓ3から排出
され、この間に通常Ｓ1≒２Ｓ2≒２Ｓ3の関係を維持す
ることが最も高い粉砕効率を得るために必要とされてい
る。The crushing space C is formed by a gap between the table 1 and the roll 2 facing each other. When both members are new, as shown in FIG. 6A, the gap gradually increases due to the locus drawn by arcs of different curvatures so that the gap S1 on the mill center side (right side in the figure) corresponding to the starting end for receiving coarse powder becomes the widest. In the gap S2 between the roll center line 21 that is the maximum diameter of the roll 2 and the table facing line 11 where the table 1 faces, the gap is reduced to substantially less than half of the gap S1 at the start end, and the table 1 and the roll 2 are almost the same. An opening is formed at the end of the pulverizing space while maintaining a gap S3 substantially equal to the gap S2 opposite to the arcuate surface of the curvature. It is known that such a setting of the crushing space C has the highest crushing efficiency and minimizes the crushing cost. That is, the highest pulverization efficiency is that coarse powder is caught in the gap S1 from the beginning of the pulverization space C, pulverized into fine powder, and discharged from the end gap S3, while maintaining the relationship of S1 ≒ 2S2 ≒ 2S3 during this time. Is needed to get
【０００４】この型式の粉砕条件で問題となるのが、ロ
―ルおよびテ―ブルの摩耗後退である。摩耗が粉砕面全
面に亘って均等に進行するのであれば、ロ―ルとテ―ブ
ルの相対的な関係はジャーナルアセンブリー機構の下方
への付勢作用によって常に一定に保たれるから実質的な
弊害はほとんど皆無であるが、実際には両者表面では不
均等な偏摩耗が進行して、当初設定した粉砕面とは異な
る歪つな曲面となって粉砕条件が大幅に悪化し、所定の
効率が持続できなくなって予定を下回る実績しか挙げら
れなくなる。図６（Ｂ）はこの関係を例示した断面図で
あって、図の右側から被粉砕品が装入され左側から粉体
として押し出される経過を続ける間に、テーブル、ロ―
ルともに不均等な摩耗が進み、最初の点線Ｍの位置から
摩耗によって実線Ｎの位置まで偏った後退をすると、粉
砕空間Ｃの構成が逆転し粉砕作用に貢献しない両側の間
隙が狭くなり、実質的に粉砕作用が発揮される中央部が
歪つに変形して粉砕効率は目に見えて低下する。A problem with this type of grinding conditions is the retreat of the rolls and tables. If the wear progresses evenly over the entire crushing surface, the relative relationship between the roll and the table is always kept constant by the downward biasing action of the journal assembly mechanism. There is almost no adverse effect, but in fact, uneven uneven wear progresses on both surfaces, resulting in a distorted curved surface different from the initially set crushed surface, which greatly deteriorates the crushing conditions, Efficiency can no longer be sustained, resulting in less than expected results. FIG. 6B is a cross-sectional view illustrating this relationship. The table and the roaming table are continuously moved while the object to be ground is loaded from the right side of the figure and extruded as powder from the left side.
When the wear is unevenly advanced in both directions, and the retreat is biased from the position of the initial dotted line M to the position of the solid line N due to the wear, the configuration of the pulverizing space C is reversed, and the gaps on both sides which do not contribute to the pulverizing action are narrowed. The central portion where the crushing action is exerted is deformed into a distorted shape, and the crushing efficiency is visibly reduced.
【０００５】効率の低下したテーブル、ロールは現地に
おいて取り替えるときわめて煩瑣な分解、取り外し、取
り付けの作業を強いられ、その間、プラントは停止せざ
るを得ないため多大の労力と時間の浪費を余儀なく強い
られるので、従来から特殊な硬化溶接肉盛法を用いて消
耗部材を一定期間毎に再生復元する技術が開発され大き
な成果を挙げている。一般に摩耗退入した消耗部材の摩
耗面を再生する溶接肉盛には、肉盛層の数に格別の制限
がなく任意の厚さまで多層盛りすることが元の形状に回
復するための最大の要件となり、かつ、できるだけ硬度
が高く耐摩耗性が良好なのがよいことはいうまでもな
い。この要件を満たす溶加材として、たとえばＣ：３．
０〜７．０％、Ｓｉ：０．５〜２．０％、Ｍｎ：０．５
〜４．０％、Ｃｒ：２０．０〜３５．０％、残りＦｅを
主成分とする溶着金属が得られる溶加材を使用すれば、
ビッカース硬度Ｈｖも６００を越えるし、多層盛りも可
能であり目的に叶う。しかも、耐摩耗用鋳造材として慣
用化される高炭素高クロム鋳鉄（Ｎｉ Ｈａｒｄ４）の
２〜２．５倍の耐用期間をもたらすとされている。具体
的にはソウドメタル社（ＳＯＵＤＯＭＥＴＡＬ社−ベル
ギー）の２５６−０、またはストゥーディ社（ＳＴＯＯ
ＤＹ社−アメリカ）の１００−ＨＤなどが代表的な溶加
材として多用されている銘柄である。[0005] Replacement of inefficient tables and rolls in the field requires extremely complicated disassembly, removal and installation work, during which time the plant must be shut down, resulting in a great deal of labor and time waste. Therefore, a technique for regenerating and restoring a consumable member at regular intervals using a special hardened welding overlay method has been developed and has achieved great results. In general, for weld overlays that regenerate the worn surface of wear-out consumable members, there is no particular limitation on the number of overlay layers, and the maximum requirement for restoring the original shape is to build up multiple layers to an arbitrary thickness. It goes without saying that the hardness should be as high as possible and the wear resistance should be good. As a filler material satisfying this requirement, for example, C: 3.
0 to 7.0%, Si: 0.5 to 2.0%, Mn: 0.5
４4.0%, Cr: 20.0 to 35.0%, and the remaining metal is used.
The Vickers hardness Hv also exceeds 600, and a multi-layer pile is also possible, which fulfills the purpose. Moreover, it is said to provide a service life of 2 to 2.5 times that of a high-carbon high-chromium cast iron (Ni Hard4) which is commonly used as a wear-resistant cast material. Specifically, 256-0 of SOUDOMETAL (Belgium) or STUDIO (STOO)
DY Corporation-USA) 100-HD is a brand frequently used as a typical filler material.
【０００６】出願人は先に特公平７−４６６４号におい
て竪型ロールミルのテーブル再生について、また特公平
７−１０２４５６号においてロール再生について、それ
ぞれ独自の再生方法、とくに現地の竪型ロールミルにお
いて消耗した部材を取り外さないでそのまま完全な溶接
肉盛が実施できるような特殊な装置と手順を提示し、発
電プラントやセメント業界などの分野において、摩耗退
入したテーブルやロールの摩耗面を溶接肉盛によって元
の形状に回復させ、再び新品と同じ粉砕効率を取戻して
高い評価を受けてきたのである。[0006] The applicant has previously used a unique method for regenerating a table of a vertical roll mill in Japanese Patent Publication No. Hei 7-4664 and a roll regenerating method in Japanese Patent Publication No. Hei 7-102456, particularly in a local vertical roll mill. We will present special equipment and procedures that enable complete welding overlay without removing parts, and in the fields of power plants and cement industry, we will use the weld overlay to reduce the wear surface of tables and rolls that have worn away. It was restored to its original shape and regained the same crushing efficiency as a new one, and received high praise.
【０００７】[0007]
【発明が解決しようとする課題】図６（Ｂ）に示す摩耗
パターンは、消耗部材の部位によって摩耗退入の進行速
度（摩耗深さ）に大きな違いがあることを明示してい
る。粉砕に最も大きく関与する部位が最も摩耗退入量も
多いことを示しており、図６の例で示せば、取り付け当
初のテーブルとロールとのオリジナルなセット間隔は、
ロール中心線２１とテーブル対向線１１における隙間Ｓ
２が、たとえば図６（Ａ）のように１５ｍｍであり、始
端の隙間Ｓ１がその倍以上の３６．６ｍｍ、終端の隙間
Ｓ３がほぼ同じ１４．４ｍｍ、ロールの軸線の傾きθが
１４．５°の実線Ｍで粉砕空間Ｃを設定したとき、粉砕
能力、粉砕効率がともに最高であることを示している。The wear pattern shown in FIG. 6B clearly shows that there is a great difference in the progress rate of wear regression (wear depth) depending on the position of the consumable member. The portion that is most involved in the pulverization indicates that the wear retreat amount is the largest, and as shown in the example of FIG. 6, the original set interval between the table and the roll at the time of installation is
Clearance S between roll center line 21 and table facing line 11
6 is, for example, 15 mm as shown in FIG. 6 (A), the gap S1 at the start end is 36.6 mm, which is twice or more of that, the gap S3 at the end is about 14.4 mm, and the inclination θ of the axis of the roll is 14.5. When the crushing space C is set by the solid line M in °, it is shown that both the crushing capacity and the crushing efficiency are the highest.
【０００８】摩耗退入が進行しオリジナルのセット間隔
（点線Ｍ）が図６（Ｂ）の実線Ｎで示す摩耗線のように
最大位置Ｓでおよそ１００ｍｍまで進行した状態となる
と、この竪型ロールミルの粉砕能力はおよそ３０％程度
低下する。竪型ロールミルの能力がこのように低下して
も、操業に必要なランニングコストは変わらないから、
製粉単位当りの原価は３０％程度上昇せざるを得ない。
このことは図７で代表例として示すように、竪型ロール
ミルの粉砕時間の経過と共に粉砕能力は低下の一途を辿
り、低下の割合を１０％程度に抑えようとすれば３０％
の低下まで継続する場合のおよそ６０％の寿命で竪型ロ
ールミルの消耗部材を交換または肉盛再生する必要があ
ることとなり、製粉コストおよび消耗部材コストの高騰
が極めて過大な負担に跳ね上がることは言うまでもな
い。When the regression of wear progresses and the original set interval (dotted line M) advances to about 100 mm at the maximum position S as shown by the wear line indicated by the solid line N in FIG. Crushing ability is reduced by about 30%. Even if the capacity of the vertical roll mill decreases in this way, the running cost required for operation does not change,
The cost per mill unit has to rise by about 30%.
This is shown in FIG. 7 as a typical example, as the grinding time of the vertical roll mill elapses, the grinding performance keeps decreasing, and if the reduction rate is to be suppressed to about 10%, it will be 30%.
Needless to say, it is necessary to replace or rebuild the consumable members of the vertical roll mill with a life of about 60% of the case where it continues to decrease, and soaring costs of milling and consumable parts jump up to an extremely large burden. No.
【０００９】粉砕効率の加速的な低下は、結局、従来技
術の再生方法で摩耗退入した摩耗面を溶接肉盛して元の
形状に復元したとしても、再使用時に同じような偏った
摩耗が進行すれば、理想のレース面形状（オリジナルの
粉砕空間）が早々に失われ、急速に図７のような下降カ
ーブを描いて低落することを意味する。すなわち高効率
の粉砕空間は摩耗進行の偏りを許さずにできるだけ長期
に亘って理想の形状を失わないことによってのみ実現さ
れる。[0009] Accelerated reduction of the grinding efficiency is, in the end, the same uneven wear at the time of re-use, even if the worn surface that has been worn away by the prior art regenerating method is overlaid by welding and restored to its original shape. Progresses, it means that the ideal race surface shape (original crushing space) is quickly lost, and rapidly falls with a descending curve as shown in FIG. That is, a highly efficient pulverizing space can be realized only by maintaining the ideal shape for as long as possible without allowing unevenness in the progress of wear.
【００１０】本発明は以上の課題を解決するために、最
初の理想的な粉砕空間の形状をできるだけ長期間維持で
きる竪型ロールミルの消耗部材の再生方法の提供を目的
とする。[0010] In order to solve the above-mentioned problems, an object of the present invention is to provide a method of regenerating a consumable member of a vertical roll mill capable of maintaining the initial ideal shape of a pulverizing space as long as possible.
【００１１】[0011]
【課題を解決するための手段】本発明に係る竪型ロール
ミルの消耗部材の再生方法は、消耗部材の不均等に退入
した摩耗面を、ビッカース硬度Ｈｖ６００以上を具え多
層肉盛の可能な溶加材Ａを用いて多層肉盛層１Ａ，２Ａ
を形成して最高の粉砕効率を約束する粉砕面の元の形状
に回復し、次に少なくともビッカース硬度Ｈｖ７５０以
上の高硬度を具え多層肉盛の困難な溶加材Ｂを用いて前
記多層肉盛層１Ａ，２Ａの表面上へ超硬薄肉層１Ｂ、２
Ｂを形成することによって前記の課題を解決した。According to the present invention, there is provided a method for regenerating a consumable member of a vertical roll mill according to the present invention. Multilayer overlay 1A, 2A using additive A
To restore the original shape of the pulverized surface which promises the highest pulverization efficiency, and then using the filler B having a high hardness of at least Vickers hardness Hv750 and difficult to multi-layer build up. The ultra-hard and thin layers 1B, 2B on the surfaces of the layers 1A, 2A
The above problem was solved by forming B.
【００１２】より具体的には、超硬薄肉層１Ｂ、２Ｂを
形成する溶加材Ｂが、マトリックスを形成するワイヤを
溶着肉盛しつつ該マトリックス溶融プール内へタングス
テン炭化物粉粒体を３０〜５０重量％の割合で添加して
分散した複合組織を形成すること、または重量％にし
て、Ｃ：４．５〜７．０％、Ｃｒ：２０．０〜２５．０
％の他、Ｍｏ：５．０〜８．０％、Ｎｂ：５．０〜８．
０％、Ｗ：１．０〜３．０％、Ｖ：１．０〜２．０％、
Ｂ：１．０〜２．０％のすべて、または少なくともその
一部を含み、残りＦｅよりなる多成分系炭化物析出硬化
型が極めて望ましい形態である。More specifically, the filler material B forming the ultra-hard and thin layers 1B and 2B deposits 30 to 40 tungsten carbide powder particles into the matrix molten pool while depositing wires forming the matrix. Forming a dispersed composite structure by adding at a ratio of 50% by weight, or by weighting, C: 4.5 to 7.0%, Cr: 20.0 to 25.0
%, Mo: 5.0 to 8.0%, Nb: 5.0 to 8.0.
0%, W: 1.0 to 3.0%, V: 1.0 to 2.0%,
B: A multi-component carbide precipitation hardening type containing all or at least a part of 1.0 to 2.0% and remaining Fe is a very desirable form.
【００１３】この再生方法に使用する溶加材Ａはビッカ
ース硬度Ｈｖが６００以上は具えるから、従来の高炭素
高クロム系鋳鉄、たとえばニハード４（Ｎｉ Ｈａｒｄ
４）などの耐摩耗材に比べて一段と高い耐摩耗性を保持
し、かつ、多層肉盛を前提とするから高い生産性を以て
摩耗退入部の大半を再生して元の形状に回復する。その
表面上へ重ねて被覆する溶加材Ｂは、ビッカース硬度Ｈ
ｖ７５０以上の高硬度を具えるが、その代わりに靱性に
乏しく１〜３層の僅かな層厚しか溶接肉盛が難しい。そ
れ以上無理に多層重ねても大きな亀裂と剥離を生じ実機
に取り付けて粉砕運転しても長期の耐用期間を維持する
ことは難しい。しかし、この強力な超硬薄肉層が健全に
溶着して多層肉盛層の表面を被覆する限り、摩耗作用を
受け付けず長期に亘って溶着当初の理想的な粉砕空間の
形状を持続し続けるから、不均等な摩耗の進行に伴う急
速な粉砕効率の低下を阻止することによって課題を解決
する。Since the filler material A used in this recycling method has a Vickers hardness Hv of 600 or more, a conventional high carbon high chromium cast iron such as Nihard 4 (Ni Hard 4) is used.
4) As compared with the wear-resistant material such as 4), the wear resistance is further enhanced, and since the multi-layer build-up is assumed, most of the wear retreating portion is regenerated with high productivity to recover the original shape. The filler material B to be overlaid on the surface has a Vickers hardness H
Although it has a high hardness of v750 or more, it has poor toughness and only a small thickness of 1 to 3 layers is difficult to weld. Even if the layers are forcibly stacked, large cracks and peeling will occur, and it is difficult to maintain a long service life even when mounted on a real machine and crushed. However, as long as this strong ultra-hard thin layer is welded soundly and covers the surface of the multi-layer build-up layer, it does not accept the abrasion action and keeps the ideal shape of the initial grinding space for a long time without welding. The problem is solved by preventing a rapid decrease in grinding efficiency due to uneven wear.
【００１４】[0014]
【発明の実施の形態】図１は本発明の実施形態を示す要
部の縦断正面図であり、テーブル１とロール２の摩耗部
に対し、まず溶加材Ａによって多層肉盛層１Ａ，２Ａを
それぞれ公知技術によって溶接肉盛し、ほぼ使用前の粉
砕空間Ｃに相当する形状に復元する。この溶加材Ａとし
ては、既に述べたように、Ｃ：３．０〜７．０％、Ｓ
ｉ：０．５〜２．５％、Ｍｎ：１．５〜４．０％、Ｃ
ｒ：２０．０〜３５．０％、残りＦｅよりなる高クロム
系肉盛層となるフラックスコアドワイヤによる自動連続
溶接を適用すれば好能率が保証される。引続いて多層肉
盛層１Ａ，２Ａの表面上へ溶加材Ｂによって超硬薄肉層
１Ｂ、２Ｂを溶着する。この溶着は１層だけに限られ、
図２に例示するような溶接装置によってワイヤを送り込
み、多層肉盛層１Ａの上へ一層だけの肉盛層を形成しつ
つ、溶融プールの中へタングステン炭化物を一定割合で
添加し、薄肉ながら抜群の高耐摩耗性を具えた超硬薄肉
層１Ｂを形成する。FIG. 1 is a longitudinal sectional front view of an essential part showing an embodiment of the present invention. First, a multi-layer buildup layer 1A, 2A is applied to a worn portion of a table 1 and a roll 2 by a filler material A. Are welded by a known technique, and restored to a shape substantially corresponding to the crushing space C before use. As described above, as the filler material A, C: 3.0 to 7.0%, S
i: 0.5 to 2.5%, Mn: 1.5 to 4.0%, C
r: 20.0 to 35.0%, the efficiency is assured by applying automatic continuous welding with a flux-cored wire that becomes a high chromium build-up layer composed of the remaining Fe. Subsequently, the ultra-hard and thin layers 1B and 2B are welded on the surfaces of the multi-layer build-up layers 1A and 2A by the filler material B. This welding is limited to only one layer,
A wire is fed by a welding device as illustrated in FIG. 2, and while forming only one overlay layer on the multilayer overlay layer 1 </ b> A, tungsten carbide is added at a fixed rate into the molten pool, and is excellent in thinness. To form a super hard thin layer 1B having high wear resistance.
【００１５】この場合の溶接条件としては、 1.溶接電流 ４００Ａ 2.溶接電圧 ２８Ｖ 3.走行速度 １５００ｍｍ／ｍｉｎ 4.層間温度 ３００℃以下 5.入熱量 ４０００Ｊ／ｃｍ 6.タングステン炭化物 Ｗ：８７．０％，Ｃ：
５．７％，Ｃｏ：６．７％を主成分とする粒径０．４〜
０．９ｍｍのペレット 7.タングステン炭化物投下量 ０．３ｋｇ／ｍｉｎ 8.タングステン炭化物充填率 ３０〜４０％ 9.超硬薄肉層の層厚 １層のみ、約６ｍｍ 10.使用ワイヤ Ｃ：６．０％，Ｃｒ：２８．０％を
主成分とするフラックスコアドワイヤ。 かつ、シールドガスを使用せず、予熱および後熱もなく
薄肉ながら超高硬度の表面層を形成する。The welding conditions in this case are: 1. welding current 400 A 2. welding voltage 28 V 3. running speed 1500 mm / min 4. interlayer temperature 300 ° C. or less 5. heat input 4000 J / cm 6. tungsten carbide W: 87. 0%, C:
Particle size 0.4 to 5.7%, Co: 6.7% as main component
0.9 mm pellet 7. Tungsten carbide drop rate 0.3 kg / min 8. Tungsten carbide filling rate 30-40% 9. Layer thickness of ultra-hard thin layer Only one layer, about 6 mm 10. Wire used: C: 6.0 %, Cr: 28.0% as a major component. In addition, a thin, ultra-hard surface layer is formed without using pre-heating and post-heating without using a shielding gas.
【００１６】本例では装置の簡略さや現地施工の軽便さ
から複合ワイヤを使用するオ―プンア―ク溶接法を採用
した。ロールの材質はクロム２７％をふくむ白銑鋳鉄が
公知の耐摩耗材としては最も定評があるので、肉盛再生
する溶接部もほぼ同一の材質で復元するのが最も望まし
い。溶接デポジットをこの材質で特定し、なおワイヤに
よる連続自動溶接を可能とするために、本例ではフラッ
クスコアドワイヤを使用した。すなわちワイヤの軸芯を
中空とし、この中空部にクロム，炭素など所望の添加成
分の粉末を充填し、ワイヤ自体は可撓性を有する材質と
し、溶接時に反応して母材とほぼ等しい成分を溶製する
ものである。In this embodiment, an open-arc welding method using a composite wire is adopted because of the simplicity of the apparatus and the ease of on-site construction. Since the material of the roll is white iron cast iron containing 27% of chromium, which is the most reputed as a known wear-resistant material, it is most desirable to restore the welded portion for rebuilding with almost the same material. In this example, a flux cored wire was used in order to specify a welding deposit with this material and to enable continuous automatic welding with a wire. That is, the core of the wire is hollow, and the hollow portion is filled with powder of a desired additive component such as chromium, carbon, etc., and the wire itself is made of a flexible material. It is to be melted.
【００１７】超硬薄肉層１Ｂ、２Ｂはマトリックスは高
クロム炭化物の析出したマルテンサイト相をベースと
し、マトリックス中へ粒体に含まれたタングステンおよ
び炭素などの一部が拡散し、タングステン炭化物特有の
魚骨状の炭化物を分散した組織となる。溶融プール中へ
少量のタングステンと炭素が溶出することによって、マ
トリックス自身の硬度も単一相に比べて飛躍的に増加
し、ビッカース硬度Ｈｖ１１００にも達することもあり
得る。加えてマトリックス中に分散しタングステン炭化
物の粒自体のビッカース硬度はおよそＨｖ１８００にも
達し、靱性のない薄層とはいえ耐摩耗性は抜群に強化さ
れて粉砕空間の対向する表面を堅牢緻密に保護し、理想
的な粉砕空間を長く持続する。In the ultra-hard and thin layers 1B and 2B, the matrix is based on a martensitic phase in which high chromium carbide is precipitated, and part of tungsten and carbon contained in the particles is diffused into the matrix, and the matrix is unique to tungsten carbide. It becomes a structure in which fish bone-like carbides are dispersed. Due to the elution of a small amount of tungsten and carbon into the molten pool, the hardness of the matrix itself also increases dramatically compared to the single phase, and can reach Vickers hardness Hv1100. In addition, the tungsten carbide particles themselves dispersed in the matrix have a Vickers hardness of about Hv1800, and even though they are thin layers without toughness, their abrasion resistance is remarkably enhanced and the opposing surfaces of the grinding space are firmly and densely protected. And lasts an ideal grinding space for a long time.
【００１８】図３は本発明の別の実施形態を示す要部の
縦断正面図であり、テーブル１に対しては多層肉盛層１
Ａの上へ超硬薄肉層１Ｂを２層、また、ロール２に対し
ては多層肉盛層１Ｂの上へ超硬薄肉層２Ｂを３層溶接肉
盛した例であり、この場合はタングステン炭化物の分散
硬化に代えて多成分系炭化物析出硬化型の溶加材Ｂを適
用する。Ｍｏ，Ｎｂ，Ｗ，Ｖの一種以上の添加は、それ
ぞれＣｒと共に複合炭化物を形成して一挙に硬度を向上
し、ビッカース硬度Ｈｖ７５０以上を得るが、同時に脆
性も増大するため、溶接肉盛層の層厚は１０〜１２ｍｍ
程度まで、すなわち以下に列挙する溶接条件によっても
１〜３層までの積層に留めることが重要な要件であり、
それ以上の多層溶接肉盛は溶着部に大きな割れ、亀裂を
誘発し、使用中の剥離脱落を呼ぶ主な原因となる懸念が
否定できない。この場合の溶接条件は、 1.溶接電流 ４５０Ａ 2.溶接電圧 ３０Ｖ 3.走行速度 ２０００ｍｍ／ｍｉｎ 4.層間速度 ３００℃以下 5.入熱量 ４０００Ｊ／ｃｍ 6.超硬薄肉層の層厚 １〜３層まで、４〜１２ｍｍの
範囲 7.使用ワイヤ ２．８ｍｍのフラックスコアドワイ
ヤ。主成分はＣ：５．１％，Ｍｎ：０．７％，Ｓｉ：
０．５％，Ｃｒ：２１．０％，Ｎｂ：６．７５％，Ｂ：
０．８％，残Ｆｅよりなる。FIG. 3 is a longitudinal sectional front view of a main part showing another embodiment of the present invention.
This is an example in which two super hard thin layers 1B are welded on A, and three super hard thin layers 2B are welded on the roll 2 on the multi-layer build layer 1B. In this case, tungsten carbide is used. Is used instead of the dispersion hardening of the above. The addition of one or more of Mo, Nb, W and V forms a composite carbide together with Cr and increases the hardness all at once, and obtains a Vickers hardness Hv750 or more, but also increases the brittleness. Layer thickness is 10-12mm
To the extent, that is, it is an important requirement to keep the lamination of up to 1 to 3 layers depending on the welding conditions listed below,
If the multi-layer weld overlay is larger than that, it induces large cracks and cracks in the welded portion, and it cannot be denied that it is the main cause of causing peeling-off during use. The welding conditions in this case are: 1. Welding current 450A 2. Welding voltage 30V 3. Running speed 2000mm / min 4. Interlayer speed 300 ° C or less 5. Heat input 4000 J / cm 6. Layer thickness of ultra-hard thin layer 1-3 To layer, range from 4 to 12 mm 7. Wire used 2.8 mm flux cored wire. The main components are C: 5.1%, Mn: 0.7%, Si:
0.5%, Cr: 21.0%, Nb: 6.75%, B:
0.8%, with the remaining Fe.
【００１９】表１は比較例として従来技術によって形成
した多層肉盛層、および本発明の実施形態の試料を同一
条件で比較をするために実施したラバーホィル式摩耗試
験法（ＲＷＡＴ）の試験条件を示した表であり、表２は
この試験によって得られた摩耗量と耐摩耗倍率を示した
ものである。ここで実施例１はタングステン炭化物を溶
融プールに添加した本発明の第１の態様（図１）であ
り、実施例２は図３に示した多成分系炭化物析出硬化型
による本発明の第２の態様をそれぞれ示し、比較例１
は従来技術、すなわちＣ：３．０〜７．０％、Ｃｒ：２
０．０〜３５．０％の高炭素高クロム系のフラックスコ
アドワイヤによる多層肉盛層である。Table 1 shows, as comparative examples, the test conditions of the rubber wheel abrasion test method (RWAT) which was carried out in order to compare the multilayer build-up layer formed by the prior art and the sample of the embodiment of the present invention under the same conditions. Table 2 shows the wear amount and wear resistance ratio obtained in this test. Here, Example 1 is the first embodiment of the present invention (FIG. 1) in which tungsten carbide is added to the molten pool, and Example 2 is the second embodiment of the present invention using the multi-component carbide precipitation hardening type shown in FIG. Comparative Example 1
Is a conventional technology, that is, C: 3.0 to 7.0%, Cr: 2
It is a multi-layer build-up layer of a high carbon high chromium based flux cored wire of 0.0 to 35.0%.
【００２０】[0020]
【表１】 [Table 1]
【表２】 [Table 2]
【００２１】摩耗試験は、ラバーホイルの回転数を６０
００回転または更に６０００回転と回転数を定めて試験
することにより摩耗量の比較をする方法により、耐摩耗
倍率は比較例１を１．００としたとき本発明の実施形態
が何倍に相当するかを示した。タングステン炭化物添加
方式においては耐摩耗倍率は約６倍弱を記録し、多成分
炭化物析出硬化型であっても約３倍弱を示し、従来、高
耐摩耗性を謳われてきた高クロム鋳鉄系に比べても遥か
に凌駕する好成績を残した。In the wear test, the number of revolutions of the rubber wheel was set to 60.
According to a method of comparing the amount of wear by setting the number of rotations to 00 rotation or 6000 rotations and performing a test, when the comparative example 1 is set to 1.00, the number of times of the embodiment of the present invention is equivalent. Or showed. In the case of tungsten carbide addition method, the wear resistance magnification is about 6 times less, and even in the case of multi-component carbide precipitation hardening type, it shows about 3 times less. It left a good result that far surpassed that of.
【００２２】つぎに高炉スラグを粉砕する竪型ロールミ
ルのテーブル及びロールについて実機テストを行なった
結果が表３である。ここで実機に取り付けた試料１〜５
までは従来技術の多層肉盛層による再生方法で摩耗部を
補修復元したものであり、試料６〜８はタングステン炭
化物添加による本発明の第１実施形態による再生を適用
しものであって、既述の溶接条件をほぼ踏襲して溶接肉
盛したものである。Next, Table 3 shows the results of actual machine tests conducted on the table and rolls of the vertical roll mill for grinding blast furnace slag. Here, samples 1 to 5 attached to the actual machine
Up to now, the worn portion was repaired and repaired by a conventional method of reproducing with a multi-layered overlay. Samples 6 to 8 were obtained by applying the regeneration according to the first embodiment of the present invention by adding tungsten carbide. This is a weld overlay that substantially follows the welding conditions described above.
【００２３】[0023]
【表３】 [Table 3]
【００２４】表３でみるように摩耗速度はほぼ半減し、
結局、すべての作業時間を総括したトータルとしての時
間当りの粉砕能力は、本発明の採用によってほぼ１０％
前後上昇しており、製粉原価の低減に直接貢献している
ことを如実に裏付けている。As shown in Table 3, the wear rate was almost halved,
As a result, the crushing capacity per hour as a total sum of all the working times is almost 10% by adopting the present invention.
It has been rising around before and after, confirming that it is directly contributing to the reduction of milling costs.
【００２５】[0025]
【発明の効果】本発明は以上に述べた通り、竪型ロール
ミルの消耗部材、とくにテーブル、ロールの溶接肉盛に
よる再生に当り、従来の画一的な多層肉盛層の再生では
超えられなかった耐用期間の限界を大幅に更新する効果
が顕著である。すなわち、本発明の原理は多層肉盛が可
能ではあるが耐摩耗性についてはなお不十分である溶加
材Ａを適用して摩耗退入部分の形状回復の下地とし、理
想的な粉砕空間を再現した多層肉盛層の表面上へ、多層
肉盛が不可能ではあるが耐摩耗性が抜群である溶加材Ｂ
の超硬薄肉層を組合わせることにより、独特の不均等な
曲線を描いて摩耗退入していく摩耗線が理想の粉砕空間
から乖離していく傾向を極力抑制し、望ましい粉砕効率
を長く保持し続けて竪型ロールミル全体としての粉砕能
力をレベルアップする効果がもたらされる。As described above, the present invention relates to regeneration of consumable members of a vertical roll mill, particularly tables and rolls by welding overlay, which cannot be exceeded by the conventional uniform multilayer overlay regeneration. The effect of renewing the useful life limit significantly is remarkable. In other words, the principle of the present invention is to use a filler material A, which is capable of forming a multi-layer build-up but is still insufficient in abrasion resistance, as a base for recovering the shape of the abrasion-removed portion, and to provide an ideal grinding space. Filler B with excellent wear resistance, although multilayer buildup is not possible, on the surface of the reproduced multilayer buildup layer
Combination of ultra-thin and ultra-thin layers minimizes the tendency of the wear line to depart from the ideal grinding space by drawing a unique uneven curve and maintaining the desired grinding efficiency for a long time As a result, the pulverizing ability of the entire vertical roll mill is improved.
【図１】本発明の実施形態を示す要部の縦断正面図であ
る。FIG. 1 is a longitudinal sectional front view of a main part showing an embodiment of the present invention.
【図２】同じ実施形態に使用する溶接装置の一例を示す
正面図である。FIG. 2 is a front view showing an example of a welding device used in the same embodiment.
【図３】本発明の別の実施形態を示す要部の縦断正面図
である。FIG. 3 is a longitudinal sectional front view of a main part showing another embodiment of the present invention.
【図４】実機に取り付けた従来技術と本発明実施形態の
摩耗量を示す図表である。FIG. 4 is a table showing the amounts of wear of the conventional technology and the embodiment of the present invention attached to an actual machine.
【図５】竪型ロールミル全体を示す一部断面正面図であ
る。FIG. 5 is a partial cross-sectional front view showing the entire vertical roll mill.
【図６】消耗部材の摩耗前（Ａ）と摩耗後（Ｂ）を示す
要部の正面断面図である。FIG. 6 is a front sectional view of a main part showing before (A) and after (B) wear of the consumable member.
【図７】竪型ロールミルの粉砕時間と粉砕能力の相関関
係を示す図表である。FIG. 7 is a table showing a correlation between a pulverizing time and a pulverizing ability of a vertical roll mill.
１ テーブル １Ａ 多層肉盛層 １Ｂ 超硬薄肉層 ２ ロール ２Ａ 多層肉盛層 ２Ｂ 超硬薄肉層 11 テーブル対向線 21 ロール中心線 Ｃ 粉砕空間 DESCRIPTION OF SYMBOLS 1 Table 1A Multilayer overlay 1B Carbide thin layer 2 Roll 2A Multilayer overlay 2B Carbide thin layer 11 Table facing line 21 Roll center line C Crushing space
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｃ２２Ｃ 38/00 ３０２ Ｃ２２Ｃ 38/00 ３０２Ｚ 38/36 38/36 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification symbol FI // C22C 38/00 302 C22C 38/00 302Z 38/36 38/36
Claims (3)
生方法において、該消耗部材の不均等に退入した摩耗面
をビッカース硬度Ｈｖ６００以上を具え多層肉盛の可能
な溶加材Ａを用いて多層肉盛層１Ａ，２Ａを形成して最
高の粉砕効率を約束する粉砕面の元の形状に回復し、次
に少なくともビッカース硬度Ｈｖ７５０以上の高硬度を
具え多層肉盛の困難な溶加材Ｂを用いて前記多層肉盛層
１Ａ，２Ａの表面上へ超硬薄肉層１Ｂ、２Ｂを形成する
ことを特徴とする竪型ロールミルの消耗部材の再生方
法。1. A method for regenerating a worn consumable member of a vertical roll mill using a filler material A having a Vickers hardness Hv of 600 or more and capable of multi-layer build-up, wherein the consumable member has an unevenly recessed wear surface. A multi-layer overlay 1A, 2A is formed to restore the original shape of the pulverized surface which promises the highest pulverization efficiency, and then has a high hardness of at least Vickers hardness Hv750 or more and is a filler material B which is difficult to multi-layer overlay. A method for regenerating a consumable member of a vertical roll mill, comprising forming super-hard thin layers 1B and 2B on the surfaces of the multi-layer build-up layers 1A and 2A by using the method described above.
Ｂを形成する溶加材Ｂが、マトリックスを形成するワイ
ヤを溶着肉盛しつつ該マトリックス溶融プール内へタン
グステン炭化物粉粒体を３０〜５０重量％の割合で添加
して分散した複合組織を形成することを特徴とする竪型
ロールミルの消耗部材の再生方法。2. The super hard thin layer 1B according to claim 1,
The filler metal B forming B forms a composite structure in which tungsten carbide powder is added to the matrix molten pool at a ratio of 30 to 50% by weight while dispersing the wires forming the matrix by welding. A method for regenerating consumable members of a vertical roll mill.
Ｂを形成する溶加材Ｂが、重量％にしてＣ：４．５〜
７．０％、Ｃｒ：２０．０〜２５．０％の他、Ｍｏ：
５．０〜８．０％、Ｎｂ：５．０〜８．０％、Ｗ：１．
０〜３．０％、Ｖ：１．０〜２．０％、Ｂ：１．０〜
２．０％のすべて、または少なくともその一部を含み、
残りＦｅよりなる多成分系炭化物析出硬化型であること
を特徴とする竪型ロールミルの消耗部材の再生方法。3. The super hard thin layer 1B according to claim 1,
The filler material B forming B is expressed in terms of% by weight and C: 4.5 to
7.0%, Cr: 20.0 to 25.0%, and Mo:
5.0-8.0%, Nb: 5.0-8.0%, W: 1.
0 to 3.0%, V: 1.0 to 2.0%, B: 1.0 to
2.0% all, or at least a portion thereof,
A method of regenerating a consumable member of a vertical roll mill, wherein the consumable member is a multi-component carbide precipitation hardening type comprising the remaining Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10131364A JPH11309596A (en) | 1998-04-23 | 1998-04-23 | Reproducing method of consumable member vertical roll mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10131364A JPH11309596A (en) | 1998-04-23 | 1998-04-23 | Reproducing method of consumable member vertical roll mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11309596A true JPH11309596A (en) | 1999-11-09 |
Family
ID=15056208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10131364A Pending JPH11309596A (en) | 1998-04-23 | 1998-04-23 | Reproducing method of consumable member vertical roll mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11309596A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056656A (en) * | 2004-08-19 | 2006-03-02 | Shinko Electric Co Ltd | Lifting electromagnet |
| KR100580284B1 (en) | 2004-10-25 | 2006-05-16 | (주)대영웰텍 | A recycled roller and recycling method for pulverizer |
| JP2006247539A (en) * | 2005-03-11 | 2006-09-21 | Tokushu Denkyoku Kk | Sintered crusher receiving blade |
| KR100892320B1 (en) * | 2008-09-12 | 2009-04-08 | 주식회사 정원엔지니어링 | Overlay welding layer and pulverizer |
| WO2016101952A1 (en) * | 2014-12-22 | 2016-06-30 | Flsmidth A/S | Wear-resistant roller |
| WO2018146154A1 (en) * | 2017-02-07 | 2018-08-16 | Mec Holding Gmbh | A method of repairing a roller and table used in a roller mill and to a roller and table so repaired |
| WO2019219124A1 (en) * | 2018-05-15 | 2019-11-21 | Prihoda Helmut | Method for improving the productivity of grinding plants |
| KR102534401B1 (en) | 2022-11-21 | 2023-05-18 | 주식회사 정원엔지니어링 | Manufacturing Method of Pulverizing Roll and Roll Table |
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| JPS55165149A (en) * | 1979-06-11 | 1980-12-23 | Mitsubishi Heavy Ind Ltd | Roller for powdered coal combustion apparatus |
| JPS5673553A (en) * | 1979-11-22 | 1981-06-18 | Mitsubishi Heavy Ind Ltd | Roller for powdered coal mill |
| JPH0550237A (en) * | 1991-06-25 | 1993-03-02 | Kurimoto Ltd | Multi-layer buildup welding method for high hardness metal |
| JPH074664B2 (en) * | 1988-12-06 | 1995-01-25 | 株式会社栗本鐵工所 | Vertical roll mill table recycling method and apparatus |
| JPH09108889A (en) * | 1995-10-16 | 1997-04-28 | Kurimoto Ltd | Liner for lining |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55165149A (en) * | 1979-06-11 | 1980-12-23 | Mitsubishi Heavy Ind Ltd | Roller for powdered coal combustion apparatus |
| JPS5673553A (en) * | 1979-11-22 | 1981-06-18 | Mitsubishi Heavy Ind Ltd | Roller for powdered coal mill |
| JPH074664B2 (en) * | 1988-12-06 | 1995-01-25 | 株式会社栗本鐵工所 | Vertical roll mill table recycling method and apparatus |
| JPH0550237A (en) * | 1991-06-25 | 1993-03-02 | Kurimoto Ltd | Multi-layer buildup welding method for high hardness metal |
| JPH09108889A (en) * | 1995-10-16 | 1997-04-28 | Kurimoto Ltd | Liner for lining |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056656A (en) * | 2004-08-19 | 2006-03-02 | Shinko Electric Co Ltd | Lifting electromagnet |
| KR100580284B1 (en) | 2004-10-25 | 2006-05-16 | (주)대영웰텍 | A recycled roller and recycling method for pulverizer |
| JP2006247539A (en) * | 2005-03-11 | 2006-09-21 | Tokushu Denkyoku Kk | Sintered crusher receiving blade |
| KR100892320B1 (en) * | 2008-09-12 | 2009-04-08 | 주식회사 정원엔지니어링 | Overlay welding layer and pulverizer |
| US20170348694A1 (en) * | 2014-12-22 | 2017-12-07 | Flsmidth A/S | Wear resistant roller |
| CN107107065A (en) * | 2014-12-22 | 2017-08-29 | Fl史密斯公司 | Wear resistant roll |
| WO2016101952A1 (en) * | 2014-12-22 | 2016-06-30 | Flsmidth A/S | Wear-resistant roller |
| WO2018146154A1 (en) * | 2017-02-07 | 2018-08-16 | Mec Holding Gmbh | A method of repairing a roller and table used in a roller mill and to a roller and table so repaired |
| WO2019219124A1 (en) * | 2018-05-15 | 2019-11-21 | Prihoda Helmut | Method for improving the productivity of grinding plants |
| KR20210008350A (en) * | 2018-05-15 | 2021-01-21 | 헬무트 프리호다 | How to improve productivity of grinding equipment |
| JP2021523828A (en) * | 2018-05-15 | 2021-09-09 | プリホーダ，ヘルムート | Methods for improving the productivity of grinding equipment |
| US11654439B2 (en) | 2018-05-15 | 2023-05-23 | Helmut Prihoda | Method for improving the productivity of grinding plants |
| KR102534401B1 (en) | 2022-11-21 | 2023-05-18 | 주식회사 정원엔지니어링 | Manufacturing Method of Pulverizing Roll and Roll Table |
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