JPH0469481B2 - - Google Patents
Info
- Publication number
- JPH0469481B2 JPH0469481B2 JP62243614A JP24361487A JPH0469481B2 JP H0469481 B2 JPH0469481 B2 JP H0469481B2 JP 62243614 A JP62243614 A JP 62243614A JP 24361487 A JP24361487 A JP 24361487A JP H0469481 B2 JPH0469481 B2 JP H0469481B2
- Authority
- JP
- Japan
- Prior art keywords
- carbide
- roll
- cermet
- plating
- coating
- 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 - Lifetime
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 70
- 238000007747 plating Methods 0.000 claims description 44
- 229910052759 nickel Inorganic materials 0.000 claims description 34
- 239000011195 cermet Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- 229910003470 tongbaite Inorganic materials 0.000 claims description 4
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 4
- 229910001096 P alloy Inorganic materials 0.000 claims description 3
- 238000007796 conventional method Methods 0.000 claims 2
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 claims 2
- 239000000463 material Substances 0.000 description 28
- 239000011651 chromium Substances 0.000 description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010419 fine particle Substances 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 229910018104 Ni-P Inorganic materials 0.000 description 3
- 229910018536 Ni—P Inorganic materials 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004439 roughness measurement Methods 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
Description
（産業上の利用分野）
本発明は、圧延プロセス用ロールおよびその製
造方法に関し、特に冷圧ミル、スキンパスミル、
リコイラなどの冷延鋼板製造プロセス用圧延設備
に適用される複合皮膜を有する冷間圧延プロセス
用ロールについての提案である。
（従来の技術）
一般に、冷延鋼板、各種めつき用原板などは、
製鋼、分塊、熱延の各工程を経た後、酸洗、冷間
圧延、焼鈍、調質圧延を行つて製造されている。
冷延工程において用いられる各種の圧延プロセス
用ロールとしては、次のような特性が要求されて
いる。
(1) 通板材に対し適度の摩擦係数を有し、いわゆ
るグリツピング性があること。
(イ) あらかじめ設定された張力が付与できるこ
と。
(ロ) 通板材をスリツプさせないこと。
(ハ) 通板材の蛇行防止機能を有すること。
(2) 通板材に対し、すり傷、圧痕などの表面疵を
発生させないこと。
(3) 表面に異物（油、鉄鉱粉、その他一般ダスト
など）が付着しにくいこと。
(4) 上記機能が長期間維持できること。
従来、こうした要請に応えられる圧延プロセス
用ロールとしては、表面に電気クロムめつきを施
したものが使用されている。
しかしながら、従来使用されている電気クロム
めつきロールは、通板材に対し表面疵を発生させ
ないという点において優れてはいるが、なお次の
ような欠点があつた。
(1) 耐摩耗性が不十分であり、寿命が短い。
(2) 高温履歴（300℃以上）を受けると、クロム
めつき層の硬さが低下し、耐摩耗性が極端に劣
化する。
(3) 耐摩耗性を向上させるには、硬度を上昇させ
る必要があるが、クロムめつき法では限界があ
り、現在の硬度（Hv850〜930）以上のものに
することは困難である。又、仮りに高硬度のも
のが得られたとしても、非常に脆く、剥離した
クロムめつきの小塊によつて通板材に疵が付く
と共に、クロムめつきの寿命が却つて短くな
る。以上説明したように、従来冷間圧延プロセ
ス用ロールとして汎用されている電気クロムめ
つきロールは、主として寿命が短いという致命
的な欠点の他、通板材の高機能性や生産性向上
などの要求を満足させることができないという
問題点もあつた。
（問題点を解決するための手段）
上述の如き解決を必要とする問題点に対して、
本発明は、
ロール表面に、タングステンカーバイドあるい
はクロムカーバイド、チタンカーバイドなどの炭
化物にコバルトやニツケルまたはニツケル・クロ
ム合金などの金属を複合化させた溶射材料を溶射
した後、さらにその表面にニツケル−リン合金に
よる無電解ニツケルめつきを施し、さらに必要に
応じて熱処理を施すという技術を提案する。
この技術にもとづくと、上述の各種の要請に応
えられる圧延プロセス用ロールを有利に製造する
ことができる。
なお、Ni−Ｐ合金の無電解めつき層は、めつ
き処理後熱処理を行うことによつて硬質クロムめ
つき並の硬さにもすることができるので、本発明
ではロールの用途に応じてその表面機能を調整す
るために前記複合皮膜に適当な熱処理を施す。
（作用）
一般に、ロール表面に溶射したWCサーメツト
（タングステンカーバイド＋ニツケルなど）皮膜
は、電気クロムめつき（Hv850〜930）より硬質
（Hv1100〜1300）で耐摩耗性に優れているが、そ
の表面をミクロ的に観察すると、鋭角を有する
WC微粒子が林立した構造となつている。このた
め、通板材に高張力を与えることができ、スリツ
プを起こすことのない優れた通板機能を長期間に
亘つて維持することができる特徴がある。しかし
一方では、通板材にスリ傷や圧痕を与え易いとい
う欠点がある。
本発明は、前記WCサーメツト溶射皮膜のもつ
特性をそのまま活かす一方で、前記欠点を補うべ
く該溶射皮膜上に無電解ニツケルめつきを施すこ
とに着目した。すなわち、このめつき処理によ
り、鋭角を有するWC微粒子の下地は、析出ニツ
ケルによつて完全に覆われる。しかも、このめつ
き皮膜は溶射皮膜の谷底部（凹部）にも確実に析
出するので、均一な平滑表面が得られやすい。
なお、このニツケルめつき処理の場合、次亜リ
ン酸塩を還元剤とする無電解ニツケルめつきを行
うと、次に示すような反応によつて非晶質のNi
−Ｐ合金（通常Ｐ含有量は５〜８％）を析出させ
ることができる。しかも、このNi−Ｐ合金は、
適当な熱処理（例えば400℃×0.1h以上）を行え
ば、結晶化してHv1000程度に硬質化し、電気ク
ロムめつきを凌駕する耐摩耗性を示す特性があ
る。
Ni2+＋H2PO2 -＋H2O
→
Ni
（析出）＋H2PO3 -＋2H+
H2PO3 -＋4H+
→
Ｐ
（析出）＋3H2O
このため、本発明の圧延プロセス用ロールは、
使用初期には従来の電気クロムめつき加工ロール
と同等の特性を示し、適当な耐摩耗係数と平滑性
を維持して通板材に疵を発生させることがない。
すなわち、実際にロールを使用する場合、その
使用期間が長くなると通板材と接触している部分
のニツケルめつき皮膜が摩耗し、WC微粒子が露
出して通板材と接触しはじめる。しかし、露出し
たWC微粒子は、その周囲をWC粒子より軟質の
ニツケルめつき皮膜に囲まれているため、通板材
との接触は微小な点接触にとどまるので、疵を発
生させることが少なくなるのである。
一方、通板材と接触しない凹部は、ニツケルめ
つきに覆われているため比較的平滑であり、たと
え鉄さび、その他の固形粉塵類が付着したとして
も系外へ排出され易く、清浄な状態を維持するこ
とができる。
さらに、ロールの使用期間が長くなつてニツケ
ルめつき皮膜の摩耗が進むと、WC粒子と通板材
との接触部が増加することとなる。しかし、その
接触域増加の速度は、一般に緩慢であるため、溶
射皮膜単独の場合の接触部に見られるような大き
な疵を発生させるようなことはなく、むしろ両者
は馴染み易い状態になるものと考えられる。
（実施例）
実施例 １
本発明の複合皮膜を有する圧延プロセス用ロー
ルの製造工程を第１図に示す。
(1) 供試材の材質および寸法
材質：一般構造用圧延鋼板
寸法：横50×縦100×厚６mm
(2) 製造工程と条件
供試材をグリツドブラスト（アルミナ質人造
研削材 WA 80）して表面の鉄さびおよび異
物を除去すると同時に凹凸を付与した後、酸素
＋炭化水素ガスの高圧燃焼炎を熱源とするジエ
ツトコート法により、次に示す化学成分のWC
サーメツトを100μｍの厚さとなるように溶射
した。
(A) WC（88％）−Co（12％）
(B) WC（73％）−Cr（20％）−Ni（７％）
その後、下記組成の無電解ニツケルめつき液
中に浸漬して、WCサーメツト皮膜上にNi−Ｐ
合金を析出被覆させた。
＜無電解ニツケルめつき液組成＞
塩化ニツケル 30ｇ／
次亜リン酸ソーダ 10ｇ／
クエン酸ソーダ 10ｇ／
＜めつき条件＞
液温 90〜95℃
時間 10〜20min
ニツケルめつき後、その表面状況を触針式表
面アラサ計にて測定した後、400℃×1hの熱処
理を行つた。
(3) 複合皮膜の効果について
本発明法に従つて供試材表面に形成した複合
皮膜の効果を調べた。この調査は表面アラサの
形状および各皮膜の硬さを測定することによつ
て行つた。比較例としては現在実施されている
電気クロムめつきおよびWCサーメツト溶射を
用いた。なお、電気クロムめつきは、クロム酸
250ｇ／、硫酸2.5ｇ／、液温53℃±２℃、
電流密度30A／ｄm2で1.5時間処理し、又WCサ
ーメツト溶射は第１図の(1)〜(3)の工程によつて
実施したものである。その結果を第２図Ａ〜Ｄ
に示す。
第２図Ａ〜Ｂは、WC（88％）−Co（12％）の
供試表面処理皮膜の表面アラサ測定結果を示し
たものである。第２図のＡ〜Ｄの符号と表面処
理皮膜の関係は次の通りである。
第２図Ａ：比較例の電気クロムめつき表面のアラ
サ曲線
第２図Ｂ：比較例のWCサーメツト溶射皮膜表面
のアラサ曲線
第２図Ｃ：Ｂの上に無電解ニツケルめつき処理し
た本発明の複合皮膜表面のアラサ曲線（本発
明）
第２図Ｄ：Ｃの複合皮膜を電気炉中で400℃×1h
の熱処理を施したものの表面のアラサ曲線（本
発明）
この結果から明らかなように、比較例(A)として
示した現在使用されている電気クロムめつき表面
に存在する凸部はすべて丸味を帯びており、これ
と接触する通板材に疵を与え難い状態になつてい
る。
これに対し、ＢのWCサーメツト溶射皮膜の表
面は、多数の鋭角を有する微粒子が林立する状態
を示している。この林立する粒子が非常に硬いた
め、高い摩擦力を示すものの、これと接触する通
板材に疵を発生させやすい状態であることが判つ
た。
この溶射皮膜上に無電解ニツケルめつきを施し
た本発明の複合皮膜Ｃの表面は、Ａの電気クロム
めつき同様、凸部は全体に丸味を帯びた状態に変
化している。この形状は、複合皮膜を400℃×1h
の熱処理を施しても変化することがなく、安定な
状態を維持している。
次に、第２図Ａ〜Ｄ皮膜の断面硬さを測定し
た。第１表はこの結果を示したもので、比較例Ａ
の電気クロムめつきは、室温（25℃）では850〜
930Hvの硬さを示したが、これを400℃×1h以上
加熱すると250〜350Hvに軟化し耐摩耗性を消失
することがわかつた。これに対し、WCサーメツ
ト皮膜は室温はもとより400℃×1h加熱後でもそ
の硬さ（1200〜1300Hv）は変化していない。こ
の溶射皮膜上に処理した無電解ニツケルめつき層
は、室温では530〜580Hv程度であるが、400℃×
1hの熱処理によつて930〜980Hvと電気クロムめ
つきを凌駕する硬さを示した。
(Industrial Application Field) The present invention relates to a roll for a rolling process and a method for manufacturing the same, and in particular to a cold rolling mill, a skin pass mill, and a method for manufacturing the same.
This is a proposal for a roll for cold rolling process having a composite coating applied to rolling equipment for manufacturing process of cold rolled steel sheets such as a recoiler. (Prior art) In general, cold-rolled steel sheets, various plated original sheets, etc.
After going through the steps of steelmaking, blooming, and hot rolling, it is manufactured by performing pickling, cold rolling, annealing, and temper rolling.
Various rolling process rolls used in cold rolling processes are required to have the following characteristics. (1) It should have an appropriate coefficient of friction against the running material, and should have so-called gripping properties. (b) A preset tension can be applied. (b) Do not allow the threaded material to slip. (c) It must have a meandering prevention function for running plate material. (2) Surface flaws such as scratches and impressions should not occur on the plated material. (3) Foreign matter (oil, iron ore powder, other general dust, etc.) should not easily adhere to the surface. (4) The above functions can be maintained for a long period of time. Conventionally, rolls for rolling processes that meet these demands have been used whose surfaces are electroplated with chrome. However, although the conventionally used electrochromic plating rolls are excellent in that they do not cause surface flaws on the threaded material, they still have the following drawbacks. (1) Insufficient wear resistance and short life. (2) When subjected to high temperature history (over 300°C), the hardness of the chrome plating layer decreases and the wear resistance deteriorates significantly. (3) In order to improve wear resistance, it is necessary to increase the hardness, but there are limits to the chrome plating method, and it is difficult to increase the hardness beyond the current hardness (Hv850-930). Moreover, even if a material with high hardness can be obtained, it is very brittle, and the threaded material will be damaged by the peeled off small lumps of chromium plating, and the life of the chrome plating will be shortened. As explained above, electrochrome plated rolls, which have been commonly used as rolls for cold rolling processes, have the fatal drawback of short lifespan, as well as demands for high functionality and improved productivity for threading materials. There was also the problem that it was not possible to satisfy the requirements. (Means for solving the problems) For the problems that need to be solved as mentioned above,
In the present invention, after spraying a thermal spray material in which a carbide such as tungsten carbide, chromium carbide, or titanium carbide is combined with a metal such as cobalt, nickel, or a nickel-chromium alloy on the surface of the roll, a nickel-rinsing material is further applied to the surface of the roll. We propose a technology in which electroless nickel plating is applied using an alloy, followed by heat treatment if necessary. Based on this technology, it is possible to advantageously manufacture rolls for rolling processes that meet the various demands mentioned above. Note that the Ni-P alloy electroless plated layer can be made as hard as hard chrome plating by performing heat treatment after plating. The composite coating is subjected to a suitable heat treatment in order to adjust its surface functionality. (Function) In general, the WC cermet (tungsten carbide + nickel, etc.) coating sprayed on the roll surface is harder (Hv 1100 - 1300) and has better wear resistance than electrochrome plating (Hv 850 - 930), but the surface When observed microscopically, it has an acute angle.
The structure has a forest of WC fine particles. Therefore, it is possible to apply high tension to the threading material, and it is possible to maintain an excellent threading function without causing slippage over a long period of time. However, on the other hand, it has the disadvantage that it is easy to cause scratches and impressions on the threaded material. The present invention focuses on applying electroless nickel plating on the WC cermet spray coating to compensate for the drawbacks while utilizing the properties of the WC cermet spray coating. That is, by this plating process, the base of the WC fine particles having an acute angle is completely covered with the precipitated nickel. Moreover, since this plating film is reliably deposited even in the valley bottoms (recesses) of the thermal sprayed film, a uniform and smooth surface is easily obtained. In addition, in the case of this nickel plating process, when electroless nickel plating is performed using hypophosphite as a reducing agent, amorphous Ni is converted by the following reaction.
-P alloy (usually P content is 5-8%) can be precipitated. Moreover, this Ni-P alloy
If an appropriate heat treatment (for example, 400°C x 0.1h or more) is performed, it will crystallize and become hard to about Hv1000, and has characteristics that show wear resistance that surpasses electrochrome plating. Ni 2+ +H 2 PO 2 - +H 2 O → Ni (precipitation) +H 2 PO 3 - +2H + H 2 PO 3 - +4H + → P (precipitation) +3H 2 O Therefore, the roll for the rolling process of the present invention
At the initial stage of use, it exhibits properties similar to those of conventional electro-chromium plated processing rolls, maintains an appropriate wear resistance coefficient and smoothness, and does not cause flaws in the threaded material. That is, when a roll is actually used, as the period of use increases, the nickel plating film on the part that is in contact with the threading material wears out, and the WC fine particles are exposed and begin to come into contact with the threading material. However, since the exposed WC fine particles are surrounded by a nickel plating film that is softer than the WC particles, their contact with the threaded material is limited to minute point contact, which reduces the possibility of causing scratches. be. On the other hand, the recesses that do not come into contact with the running material are covered with nickel plating and are relatively smooth, so even if iron rust or other solid dust adheres to them, they are easily discharged out of the system and remain clean. can do. Furthermore, as the period of use of the roll increases and the wear of the nickel plating film progresses, the number of contact areas between the WC particles and the threading material increases. However, since the rate of increase in the contact area is generally slow, it does not cause large flaws like those seen in the contact area when the thermal spray coating is applied alone, and rather the two become more compatible. Conceivable. (Examples) Example 1 The manufacturing process of a roll for a rolling process having a composite coating of the present invention is shown in FIG. (1) Material and dimensions of the test material Material: General structural rolled steel plate Dimensions: Width 50 x Height 100 x Thickness 6 mm (2) Manufacturing process and conditions The test material was grit blasted (alumina artificial abrasive material WA 80). After removing iron rust and foreign matter from the surface and adding unevenness at the same time, a WC coating with the following chemical components is applied using a jet coating method using a high-pressure combustion flame of oxygen + hydrocarbon gas as a heat source.
Cermet was sprayed to a thickness of 100 μm. (A) WC (88%) - Co (12%) (B) WC (73%) - Cr (20%) - Ni (7%) After that, it was immersed in an electroless nickel plating solution with the following composition. , Ni-P on WC cermet film
The alloy was deposited and coated. <Electroless nickel plating solution composition> Nickel chloride 30g/sodium hypophosphite 10g/sodium citrate 10g/<Plating conditions> Liquid temperature 90~95℃ Time 10~20min After nickel plating, check the surface condition. After measuring with a needle-type surface roughness meter, heat treatment was performed at 400°C for 1 hour. (3) Regarding the effect of the composite film The effect of the composite film formed on the surface of the sample material according to the method of the present invention was investigated. This investigation was conducted by measuring the shape of the surface roughness and the hardness of each film. As comparative examples, electrochrome plating and WC cermet thermal spraying, which are currently practiced, were used. In addition, electrochromic plating is performed using chromic acid.
250g/, sulfuric acid 2.5g/, liquid temperature 53℃±2℃,
Treatment was carried out at a current density of 30 A/dm 2 for 1.5 hours, and WC cermet thermal spraying was performed according to steps (1) to (3) in FIG. The results are shown in Figure 2 A to D.
Shown below. FIGS. 2A to 2B show the surface roughness measurement results of a sample surface treatment film of WC (88%)-Co (12%). The relationship between the symbols A to D in FIG. 2 and the surface treatment film is as follows. Figure 2 A: Abrasion curve of electrochrome plated surface of comparative example Figure 2 B: Abrasion curve of WC cermet sprayed coating surface of comparative example Figure 2 C: Invention of electroless nickel plating on B Aging curve of the surface of the composite film (invention) Figure 2 D: Composite film of C was heated in an electric furnace at 400°C
Roughness curve of the surface of the heat-treated product (invention) As is clear from this result, all the convexities present on the electrochrome plated surface currently used as comparative example (A) are rounded. This makes it difficult to damage the threaded material that comes into contact with it. In contrast, the surface of the WC cermet sprayed coating B shows a state in which fine particles with many acute angles stand in a forest. It was found that these clustered particles are extremely hard, and although they exhibit high frictional force, they tend to cause flaws in the threaded material that comes into contact with them. On the surface of the composite coating C of the present invention in which electroless nickel plating has been applied to this thermal sprayed coating, the convex portions have changed to a rounded state as a whole, similar to the electrochromic plating in A. This shape allows the composite film to be heated to 400℃ x 1h.
It does not change even after heat treatment and remains stable. Next, the cross-sectional hardness of the films A to D in FIG. 2 was measured. Table 1 shows the results, Comparative Example A
Electrochrome plating is 850 ~ at room temperature (25℃)
It showed a hardness of 930Hv, but it was found that if it was heated at 400°C for more than 1 hour, it would soften to 250-350Hv and lose its wear resistance. On the other hand, the hardness of the WC cermet film (1200 to 1300 Hv) remains unchanged not only at room temperature but also after heating at 400°C for 1 hour. The electroless nickel plating layer treated on this thermal spray coating has a voltage of about 530 to 580 Hv at room temperature, but at 400°C
After 1 hour of heat treatment, it showed a hardness of 930 to 980 Hv, which exceeds that of electrochrome plating.
【表】
以上の結果を総合すると、次のようなことが理
解できる。
本発明の複合処理皮膜の表面アラサの形状は、
電気クロムめつき表面のそれに類似しているため
通板材に疵を発生させることはなく、しかも硬質
であることから、その寿命はクロムめつきと同等
の長さを示すことが考えられる。しかも、無電解
ニツケルめつき層が摩耗してくると、WCサーメ
ツト溶射皮膜がニツケルめつき層中に点状となつ
て露出してくるので、両材質が通板材と接触す
る。その結果、溶射皮膜の鋭角的接触とそれを緩
和する働きの無電解ニツケルめつき層との作用が
相俟つてニツケルめつき層の耐摩耗性不足（電気
クロムめつきと同等であるが、WCサーメツトに
比較して劣る）をWCサーメツト皮膜が補うこと
となり、ひいてはこれが冷間圧延プロセス用ロー
ルとしての機能をより効率的に発揮させるのに好
都合となつている。
なお、複合皮膜上の無電解ニツケルめつき層
は、加熱条件によつて次のように硬度変化するこ
とが判明したので、冷間圧延プロセス用ロールと
して使用する際、通板材の機械的性質、通板条
件、使用目的などによつて適宜その硬さを制御す
ること可能であり、現用の電気クロムめつきに比
し用途は頗る広い。
無電解ニツケルめつきのまま 530〜580Hv
同上を200℃×0.1h加熱 750〜800Hv
400℃×0.1h加熱 930〜980Hv
600℃×0.1h加熱 380〜410Hv
なお、WC（73％）−Cr（20％）−Ni（７％）の無
電解ニツケルめつきの性状を調査した結果、WC
（88％）−Co（12％）のものと同様であり、溶射皮
膜の組成の影響は認められなかつた。
実施例 ２
実施例１の供試材を用い、下記のような金属炭
化物サーメツトを100μｍ溶射した後、無電解ニ
ツケルめつきを施し、400℃×0.1h以上の熱処理
を行つた。
(1) Cr3C2（80％）＋20％（80％Ni−20％Cr）
(2) TiC（75％）−25％（80％Ni−20％Cr）
この例においても、複合皮膜表面のアラサ曲線
は、第１図ＣおよびＤと同様な形状を示すととも
に、無電解ニツケルめつき層の硬さも熱処理によ
つて900Hv程度と硬化した。
この結果から明らかなように、本発明のロール
表面に形成する複合皮膜はWCサーメツト溶射皮
膜に限らず、Cr3C、TiCのように炭化物サーメツ
トであればすべて適用できることが明らかとなつ
た。
（発明の効果）
以上説明したように本発明によれば、耐摩耗性
に優れるとともに通板材に疵を生じさせる虞の少
ない高い平滑度を有する圧延プロセス用ロールを
得ることができる。また、本発明によれば、下地
の耐焼付性に優れるWCサーメツトの特性をも失
うこともなく、ロール用複合皮膜として好適であ
る。さらに、薄くても上述した種々の硬化を有す
るので経済的なロール被覆を果たすことができ
る。[Table] Combining the above results, the following can be understood. The shape of the surface roughness of the composite treatment film of the present invention is as follows:
Since it is similar to that of an electro-chromium plated surface, it does not cause scratches on the running material, and since it is hard, it is thought that its lifespan will be the same as that of chrome-plated. Furthermore, as the electroless nickel plating layer wears away, the WC cermet thermal spray coating becomes exposed in the form of dots within the nickel plating layer, and both materials come into contact with the threaded material. As a result, the combination of the sharp contact of the sprayed coating and the action of the electroless nickel plating layer, which acts to alleviate the contact, causes the nickel plating layer to have insufficient wear resistance (equivalent to electrochrome plating, but WC The WC cermet film compensates for this (inferiority compared to cermet), which in turn makes it convenient to more efficiently function as a roll for the cold rolling process. It has been found that the hardness of the electroless nickel plated layer on the composite coating changes as follows depending on the heating conditions. Its hardness can be controlled appropriately depending on the threading conditions and purpose of use, and its uses are much wider than the current electrochrome plating. With electroless nickel plating 530~580Hv Heating the same as above at 200℃ x 0.1h 750~800Hv Heating at 400℃ x 0.1h 930~980Hv Heating at 600℃ x 0.1h 380~410Hv Note that WC (73%) - Cr (20%) ) - As a result of investigating the properties of electroless nickel plating of Ni (7%), WC
(88%)-Co (12%), and no influence of the composition of the sprayed coating was observed. Example 2 Using the sample material of Example 1, a metal carbide cermet as shown below was thermally sprayed to a thickness of 100 μm, followed by electroless nickel plating and heat treatment at 400° C. for 0.1 h or more. (1) Cr 3 C 2 (80%) + 20% (80% Ni - 20% Cr) (2) TiC (75%) - 25% (80% Ni - 20% Cr) Also in this example, the composite coating surface The roughness curve shows the same shape as in FIG. 1 C and D, and the hardness of the electroless nickel plating layer was also hardened to about 900 Hv by heat treatment. As is clear from these results, it has become clear that the composite coating formed on the roll surface of the present invention is not limited to the WC cermet thermal spray coating, but can be applied to any carbide cermet such as Cr 3 C and TiC. (Effects of the Invention) As explained above, according to the present invention, it is possible to obtain a roll for a rolling process that is excellent in wear resistance and has high smoothness with little risk of causing flaws in the threaded material. Further, according to the present invention, the property of the WC cermet, which has excellent seizure resistance as a base, is not lost, and it is suitable as a composite film for rolls. Furthermore, even if it is thin, it has the various types of curing described above, so it can be economically rolled coated.
第１図は、本発明にかかる圧延プロセス用ロー
ルの製造工程図、第２図は、ロール表面アラサを
示すグラフであり、同図Ａは電気クロムめつき表
面、ＢはWCサーメト溶射皮膜表面、Ｃは本発明
複合皮膜表面、Ｄは本発明の熱処理複合皮膜表面
について示す。
FIG. 1 is a manufacturing process diagram of a roll for a rolling process according to the present invention, and FIG. 2 is a graph showing roll surface roughness, in which A is an electrochromic plated surface, B is a WC cermet sprayed coating surface, C indicates the surface of the composite film of the present invention, and D indicates the surface of the heat-treated composite film of the present invention.
Claims (1)
面の該溶射皮膜上に、無電解ニツケルめつき皮膜
を被成して複合皮膜を形成してなる圧延プロセス
用ロール。 ２ 上記溶射皮膜は、タングステンカーバイド、
クロムカーバイド、チタンカーバイドの如き金属
炭化物とコバルト、ニツケルおよびそれらの合金
の如き金属とから構成された炭化物サーメツトで
ある特許請求の範囲第１項に記載の圧延プロセス
用ロール。 ３ 常法に従つて表面処理したロール表面に、タ
ングステンカーバイドやクロムカーバイド、チタ
ンカーバイドの如き炭化物と、コバルトやニツケ
ルあるいはそれらの合金の如き金属との炭化物サ
ーメツトを溶射し、その溶射面の上からニツケル
−リン合金による無電解ニツケルめつきを施すこ
とを特徴とする圧延プロセス用ロールの製造方
法。 ４ 常法に従つて表面処理したロール表面に、タ
ングステンカーバイドやクロムカーバイド、チタ
ンカーバイドの如き炭化物と、コバルトやニツケ
ルあるいはそれらの合金の如き金属との炭化物サ
ーメツトを溶射し、その溶射面の上からニツケル
−リン合金による無電解ニツケルめつきを施し、
次いで200℃以上0.1時間以上の熱処理を行うこと
を特徴とする圧延プロセス用ロールの製造方法。[Scope of Claims] 1. A roll for a rolling process, which has a carbide cermet sprayed coating on the surface of the roll and is coated with an electroless nickel plating coating to form a composite coating. 2 The above thermal spray coating is made of tungsten carbide,
The roll for rolling process according to claim 1, which is a carbide cermet composed of metal carbide such as chromium carbide and titanium carbide and metal such as cobalt, nickel and alloys thereof. 3. A carbide cermet consisting of a carbide such as tungsten carbide, chromium carbide, or titanium carbide, and a metal such as cobalt, nickel, or an alloy thereof is thermally sprayed onto the surface of the roll that has been surface-treated according to a conventional method, and then A method for manufacturing a roll for a rolling process, characterized by applying electroless nickel plating using a nickel-phosphorus alloy. 4 A carbide cermet consisting of a carbide such as tungsten carbide, chromium carbide, or titanium carbide, and a metal such as cobalt, nickel, or an alloy thereof is thermally sprayed onto the surface of the roll that has been surface-treated according to a conventional method, and then Electroless nickel plating is applied using nickel-phosphorus alloy,
A method for producing a roll for a rolling process, which comprises then performing heat treatment at 200°C or higher for 0.1 hour or longer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24361487A JPS6487005A (en) | 1987-09-30 | 1987-09-30 | Roll for rolling process and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24361487A JPS6487005A (en) | 1987-09-30 | 1987-09-30 | Roll for rolling process and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6487005A JPS6487005A (en) | 1989-03-31 |
| JPH0469481B2 true JPH0469481B2 (en) | 1992-11-06 |
Family
ID=17106439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24361487A Granted JPS6487005A (en) | 1987-09-30 | 1987-09-30 | Roll for rolling process and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6487005A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0763669B2 (en) * | 1990-05-11 | 1995-07-12 | 東洋製罐株式会社 | Seamless can holding material |
| CA2092235C (en) * | 1992-03-30 | 2000-04-11 | Yoshio Harada | Spray-coated roll for continuous galvanization |
| US5931269A (en) * | 1997-04-21 | 1999-08-03 | Alliedsignal Inc. | Aircraft wheel part with corrosion and wear resistance |
| CN102732866A (en) * | 2012-06-08 | 2012-10-17 | 汕头大学 | Thermal-sprayed ceramic coating surface hole sealing method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52107243A (en) * | 1976-03-05 | 1977-09-08 | Yoshinobu Kobayashi | Surface treating process for cemented carbide |
| JPS54148166A (en) * | 1978-05-15 | 1979-11-20 | Toyo Karoraijingu Kougiyou Kk | Roller for use in aluminum rolling machine |
| JPS58221298A (en) * | 1982-06-16 | 1983-12-22 | Nippon Koushitsu Giken Kk | Conductor roll for supplying electric current |
| JPS6087910A (en) * | 1983-10-21 | 1985-05-17 | Kawasaki Steel Corp | Roll for rolling |
| JPS60196209A (en) * | 1984-03-19 | 1985-10-04 | Sumitomo Metal Ind Ltd | Three-layer plated hot rolling roll |
| JPS60196208A (en) * | 1984-03-16 | 1985-10-04 | Sumitomo Electric Ind Ltd | Built-up rolling roll |
| JPS61165212A (en) * | 1985-01-16 | 1986-07-25 | Nippon Steel Corp | Work roll for hot rolling excellent in resistance to seizure |
| JPS6216808A (en) * | 1985-07-12 | 1987-01-26 | Kawasaki Steel Corp | Roll for metallic strip |
| JPS62137111A (en) * | 1985-12-09 | 1987-06-20 | Nippon Steel Corp | Manufacture of cold rolled steel plate having excellent coating sharpness |
| JPH0469481A (en) * | 1990-07-05 | 1992-03-04 | Furukawa Electric Co Ltd:The | Shape memory alloy coupling structure |
-
1987
- 1987-09-30 JP JP24361487A patent/JPS6487005A/en active Granted
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52107243A (en) * | 1976-03-05 | 1977-09-08 | Yoshinobu Kobayashi | Surface treating process for cemented carbide |
| JPS54148166A (en) * | 1978-05-15 | 1979-11-20 | Toyo Karoraijingu Kougiyou Kk | Roller for use in aluminum rolling machine |
| JPS58221298A (en) * | 1982-06-16 | 1983-12-22 | Nippon Koushitsu Giken Kk | Conductor roll for supplying electric current |
| JPS6087910A (en) * | 1983-10-21 | 1985-05-17 | Kawasaki Steel Corp | Roll for rolling |
| JPS60196208A (en) * | 1984-03-16 | 1985-10-04 | Sumitomo Electric Ind Ltd | Built-up rolling roll |
| JPS60196209A (en) * | 1984-03-19 | 1985-10-04 | Sumitomo Metal Ind Ltd | Three-layer plated hot rolling roll |
| JPS61165212A (en) * | 1985-01-16 | 1986-07-25 | Nippon Steel Corp | Work roll for hot rolling excellent in resistance to seizure |
| JPS6216808A (en) * | 1985-07-12 | 1987-01-26 | Kawasaki Steel Corp | Roll for metallic strip |
| JPS62137111A (en) * | 1985-12-09 | 1987-06-20 | Nippon Steel Corp | Manufacture of cold rolled steel plate having excellent coating sharpness |
| JPH0469481A (en) * | 1990-07-05 | 1992-03-04 | Furukawa Electric Co Ltd:The | Shape memory alloy coupling structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6487005A (en) | 1989-03-31 |
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