JP4324920B2 - Method for manufacturing metal member - Google Patents

Method for manufacturing metal member Download PDF

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JP4324920B2
JP4324920B2 JP2005031838A JP2005031838A JP4324920B2 JP 4324920 B2 JP4324920 B2 JP 4324920B2 JP 2005031838 A JP2005031838 A JP 2005031838A JP 2005031838 A JP2005031838 A JP 2005031838A JP 4324920 B2 JP4324920 B2 JP 4324920B2
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克彦 竹津
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住友金属工業株式会社
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本発明は、金属部材の製造方法に関する。   The present invention relates to a method for manufacturing a metal member.
チタン合金や、耐熱合金などの金属材料は、熱間変形抵抗の温度依存性が高いことから、そのままの状態でロール圧延により熱間圧延しようとすると、圧延ロールとの接触により表面付近の温度が低下し、該表面付近よりも温度の高い内部との変形抵抗が大きく異なることとなる。そのため、このような熱間変形抵抗の温度依存性が高い金属材料は、そのままの状態でロール圧延することが困難で、従来、このような金属材料をロール圧延により金属部材に加工する場合には、この金属材料をコア材とし、該コア材よりも熱間変形抵抗の低い金属材料を被覆材として用いて、前記コア材の表面をこの被覆材で覆った状態、すなわち、コア材の表面温度が圧延ロールにより低下することを抑制した状態でのパック圧延などと呼ばれる圧延方法が採用されている。   Since metal materials such as titanium alloys and heat-resistant alloys have a high temperature dependence of hot deformation resistance, if they are to be hot-rolled by roll rolling as they are, the temperature near the surface is brought about by contact with the rolling roll. The deformation resistance is greatly different from that of the interior having a higher temperature than the vicinity of the surface. Therefore, such a metal material having high temperature dependency of the hot deformation resistance is difficult to roll as it is, and conventionally, when such a metal material is processed into a metal member by roll rolling. The metal material is used as a core material, and a metal material having a lower resistance to hot deformation than the core material is used as a coating material, and the surface of the core material is covered with the coating material, that is, the surface temperature of the core material. Has been adopted a rolling method called pack rolling or the like in a state where it is suppressed that the material is lowered by a rolling roll.
しかし、このパック圧延においては、異なる変形抵抗のものを同時に圧延することから所望の加工精度の製品を得ることが困難で、特許文献1には、チタン合金からなるコア材と、該コア材を上下から挟むカバー材や前記コア材の四周部に配されるスペーサー材などの被覆材とを用いて、前記カバー材とコア材との厚さの比を所定の値としてチタン合金を広幅な薄物金属部材に高い厚さ精度で加工することが記載されている。
また、特許文献2には、コア材と被覆材との変形抵抗が5kg/mm2以下となるようそれぞれの温度を選定してパック圧延することにより、得られる金属部材の波打ち、板厚不良を低減させることが記載されている。
However, in this pack rolling, it is difficult to obtain a product with a desired processing accuracy because the products having different deformation resistances are simultaneously rolled. Patent Document 1 discloses a core material made of a titanium alloy and the core material. Using a covering material such as a cover material sandwiched from above and below and a spacer material arranged on the four circumferences of the core material, the thickness ratio of the cover material to the core material is set to a predetermined value, and the titanium alloy is wide and thin. It describes that a metal member is processed with high thickness accuracy.
In Patent Document 2, the temperature of the core member and the covering material are selected so that the deformation resistance is 5 kg / mm 2 or less, and pack rolling is performed, so that the obtained metal member is corrugated and has poor thickness. It is described to reduce.
ところで、パック圧延では、圧延後に被覆材とコア材とを分離する必要があることから、これらの間にアルミナ粉などの分離剤が挿入されるなどして焼付き防止が行われたりしている。このような、パック圧延では被覆材とコア材との密着性が低く、滑りを生じ易い状態となっている。この滑りが生じるとコア材の表面に擦り傷が生じ、機械的研磨などで除去する必要が生じ、歩留まりの低下やコスト上昇を生じさせている。
一方、被覆材に使用される金属材料は、格落ち品やスクラップ材が用いられる場合が多く。特にその表面性状を顧みられることなく用いられており、例えば、ステンレス鋼材のごとく表面光沢の品質が要求される鋼種では、表面が極めて平滑なものが被覆材として用いられたりもしている。
すなわち、このパック圧延のごとく、金属材料からなるコア材と、前記金属材料よりも熱間変形抵抗の低い金属材料からなる被覆材とを用い、前記コア材を前記被覆材で覆った状態で、圧延ロールにより熱間圧延して前記コア材を金属部材に加工する金属部材の製造方法においては、従来、被覆材とコア材との滑りについての考慮が何等なされておらず、この滑りを抑制させて、コア材の表面に傷が生じることを抑制することが困難であるという問題を有している。
By the way, in pack rolling, since it is necessary to separate the coating material and the core material after rolling, seizure prevention such as alumina powder is inserted between them to prevent seizure. . In such pack rolling, the adhesion between the coating material and the core material is low, and slipping is likely to occur. When this slip occurs, the surface of the core material is scratched and needs to be removed by mechanical polishing or the like, resulting in a decrease in yield and an increase in cost.
On the other hand, the metal material used for the covering material is often an off-the-shelf or scrap material. In particular, the surface properties are used without consideration, and, for example, a steel type that requires a high surface gloss quality such as a stainless steel material may have a very smooth surface.
That is, as in this pack rolling, using a core material made of a metal material and a coating material made of a metal material having a lower hot deformation resistance than the metal material, the core material is covered with the coating material, In the metal member manufacturing method in which the core material is processed into a metal member by hot rolling with a rolling roll, conventionally, no consideration has been given to the slip between the coating material and the core material, and this slip is suppressed. Thus, it is difficult to suppress the occurrence of scratches on the surface of the core material.
特開2001−300603号公報Japanese Patent Laid-Open No. 2001-300603 特開平5−42302号公報JP-A-5-42302
本発明は、金属材料からなるコア材と、前記金属材料よりも熱間変形抵抗の低い金属材料からなる被覆材とを用い、前記コア材を前記被覆材で覆った状態で、圧延ロールにより熱間圧延して前記コア材を金属部材に加工する金属部材の製造方法において、コア材の表面傷の発生を抑制させることを課題としている。   The present invention uses a core material made of a metal material and a coating material made of a metal material having a lower hot deformation resistance than the metal material, and the core material is covered with the coating material and heated by a rolling roll. In the manufacturing method of the metal member which carries out the hot rolling and processes the said core material into a metal member, it makes it the subject to suppress generation | occurrence | production of the surface damage of a core material.
本発明者らは、従来省みられることのなかった被覆材に着目して、金属部材の傷の発生について鋭意検討を行った結果、被覆材とコア材との間に、圧延時にすべりが生じて金属部材の表面に傷が形成されること、ならびに、コア材と接触する接触面において所定の表面粗さを有する被覆材を用いることで前述のようなすべりを抑制し得ることを見出し本発明の完成に到ったのである。
すなわち、本発明は、前記課題を解決すべく、金属材料からなるコア材と、前記金属材料よりも熱間変形抵抗の低い金属材料からなる被覆材とを用い、前記コア材を前記被覆材で覆った状態で圧延ロールにより熱間圧延して前記コア材を金属部材に加工する金属部材の製造方法であって、コア材と接触する接触面が最大表面粗さ(Ry)で0.35μm以上の表面粗さを有している被覆材を前記圧延ロールと前記コア材との間に配して熱間圧延することを特徴とする金属部材の製造方法を提供する。
As a result of intensive investigations on the occurrence of scratches on metal members, the present inventors focused on the coating materials that have not been omitted in the past, and as a result, slip occurred between the coating material and the core material during rolling. The present invention has found that scratches are formed on the surface of the metal member, and that the above-mentioned slip can be suppressed by using a coating material having a predetermined surface roughness on the contact surface in contact with the core material. Has been completed.
That is, the present invention uses a core material made of a metal material and a coating material made of a metal material having a lower hot deformation resistance than the metal material in order to solve the above problems, and the core material is made of the coating material. A metal member manufacturing method in which the core material is processed into a metal member by hot rolling with a rolling roll in a covered state, and the contact surface in contact with the core material has a maximum surface roughness (Ry) of 0.35 μm or more. A method for producing a metal member is provided, wherein a coating material having a surface roughness of 2 is disposed between the rolling roll and the core material and hot rolled.
本発明によれば、圧延ロールと前記コア材との間に配される被覆材として、コア材と接触する接触面が最大表面粗さ(Ry)で0.35μm以上の表面粗さを有することから、圧延を行う際にコア材と被覆材との間のすべりが生じることを抑制することができ、このコア材に傷が発生することを抑制し得る。   According to the present invention, as the covering material disposed between the rolling roll and the core material, the contact surface in contact with the core material has a surface roughness of 0.35 μm or more in terms of the maximum surface roughness (Ry). Therefore, it is possible to suppress the occurrence of slip between the core material and the covering material during rolling, and it is possible to suppress the generation of scratches on the core material.
以下に、本発明の好ましい実施の形態について説明する。
まず、本発明の金属部材の製造方法に用いる、各部材について説明する。
The preferred embodiments of the present invention will be described below.
First, each member used for the manufacturing method of the metal member of this invention is demonstrated.
本実施形態における金属部材の製造方法においては、この金属部材に加工されるコア材と、該コア材よりも熱間変形抵抗の低い金属により形成された被覆材を用いる。   In the manufacturing method of the metal member in this embodiment, the core material processed into this metal member and the coating | covering material formed with the metal whose hot deformation resistance is lower than this core material are used.
本実施形態における前記コア材には、融点が1800℃以上の高融点金属材料により形成されたものを用いることができる。前記高融点金属材料としては、W、Mo、Ta、Crやこれら金属の合金などW、Mo、Ta、Crを主成分とする金属材料を用いることができる。これらは、一般的な鉄鋼設備の運転可能温度である1350℃以下での加工が困難であるが、本実施形態の製造方法においては、1350℃以下で加工することができるようになるため、特殊な設備を必要とせず、製造が容易となる点において好適である。
また、このようなコア材は、熱間静水圧プレス(以下「HIP」ともいう)、鋳込み成形あるいは粉末焼結などにより、通常、直方体形状のスラブに成形されたものを用いる。
As the core material in this embodiment, a material formed of a refractory metal material having a melting point of 1800 ° C. or higher can be used. As the refractory metal material, a metal material mainly composed of W, Mo, Ta, Cr, such as W, Mo, Ta, Cr and alloys of these metals can be used. These are difficult to process at 1350 ° C. or lower, which is the operable temperature of general steel equipment, but in the manufacturing method of this embodiment, it becomes possible to process at 1350 ° C. or lower, It is preferable in that it does not require any equipment and can be easily manufactured.
Such a core material is usually formed into a rectangular parallelepiped slab by hot isostatic pressing (hereinafter also referred to as “HIP”), cast molding or powder sintering.
本実施形態における前記被覆材としては、通常、コア材の上下の面よりも大きな長方形の平板形状を有するカバー材と、前記コア材の厚さと略同厚の角棒に形成されたスペーサー材とを用いる。また、前記カバー材としては、通常、コア材と、該コア材の四周部にスペーサー材を配したよりも僅かに大きな平板形状のものを用いる。すなわち、カバー材の幅は、2本分のスペーサー材の幅とコア材の幅とを足し合わせた幅よりも幅広で、2本分のスペーサー材の幅とコア材の長さとを足し合わせた長さよりも長さが長い長方形状を有している。
これら、カバー材、スペーサー材には、圧延温度における熱間変形抵抗が、コア材に用いられる金属材料よりも低い値を有するものが用いられ、コア材として前述したような高融点金属材料が用いられる場合には、汎用性が高く、種々のサイズ、形状のものが容易に準備できる点から炭素鋼又はステンレス鋼が好適である。
As the covering material in the present embodiment, usually, a cover material having a rectangular flat plate shape larger than the upper and lower surfaces of the core material, and a spacer material formed on a square bar having substantially the same thickness as the core material, Is used. In addition, as the cover material, a core material and a flat plate-shaped material that is slightly larger than a spacer material arranged on the four circumferences of the core material are usually used. That is, the width of the cover material is wider than the sum of the width of the spacer material for two pieces and the width of the core material, and the width of the spacer material for two pieces and the length of the core material are added. It has a rectangular shape whose length is longer than its length.
For these cover material and spacer material, those having a hot deformation resistance at a rolling temperature lower than that of the metal material used for the core material are used, and the refractory metal material as described above is used as the core material. When used, carbon steel or stainless steel is preferred because it is highly versatile and can be easily prepared in various sizes and shapes.
また、前記被覆材には、少なくとも一面が最大表面粗さ(Ry)で0.35μm以上の表面粗さを有しているものが用いられる。なお、このRyの値は、JIS B 0061に準じ表面粗さ計などを用いて測定することができる。また、最大表面粗さ(Ry)で0.35μm以上の表面粗さを有している状態とは、対象となる面の10箇所においてRyを測定した平均値が0.35μm以上となることを意味している。
また、すべりが生じて、傷が発生することをより有効に防止し得る点において、Ryは、0.5μm以上であることが好ましい。
In addition, a material having a surface roughness of at least one surface having a maximum surface roughness (Ry) of 0.35 μm or more is used as the covering material. The value of Ry can be measured using a surface roughness meter or the like according to JIS B0061. In addition, the state having a surface roughness of 0.35 μm or more in terms of the maximum surface roughness (Ry) means that the average value of Ry measured at 10 locations on the target surface is 0.35 μm or more. I mean.
Moreover, it is preferable that Ry is 0.5 μm or more in that it is possible to more effectively prevent slippage and scratches.
次いで、このようなコア材と被覆材とを用いて、圧延ロールによる熱間圧延を行い金属部材を製造する方法について説明する。   Next, a method for producing a metal member by performing hot rolling with a rolling roll using such a core material and a covering material will be described.
圧延ロールにより熱間圧延する被加工体は、前述したようなコア材と被覆材とを用いて以下に示すように、被覆材により形成された箱体の内部にコア材を配した状態に形成される。
まず、カバー材を前述の表面粗さを有する面を上向に設置し、該カバー材の略中央部分にコア材(スラブ)を載置する。次いで、スペーサー材をその外縁がカバー材の外縁に沿うように、前記コア材の四側面から距離を設けて配置する。そして、さらにもう1枚のカバー材を、今度は前述の表面粗さを有する面を下向にして、コア材ならびにスペーサー材上に載置して被加工体を完成させる。このようにして、被覆材で形成された箱体の中央部にコア材を配して被加工体を形成する。なお、前記スペーサー材としては、コア材に面した側面が前述の表面粗さとされているものを用いることが好ましい。
The workpiece to be hot-rolled by the rolling roll is formed in a state in which the core material is arranged inside the box formed by the coating material using the core material and the coating material as described above. Is done.
First, the cover material is installed with the surface having the above-described surface roughness facing upward, and the core material (slab) is placed on the substantially central portion of the cover material. Next, the spacer material is disposed at a distance from the four side surfaces of the core material so that the outer edge thereof is along the outer edge of the cover material. Then, another cover material is placed on the core material and the spacer material with the surface having the above-mentioned surface roughness facing down to complete the workpiece. In this way, the core material is arranged at the center of the box formed of the covering material to form the workpiece. As the spacer material, it is preferable to use a material whose side surface facing the core material has the aforementioned surface roughness.
なお、要すれば、被加工体のカバー材とスペーサー材とはTIG溶接などにより溶接されていてもよい。ただし、その場合は、載置されたコア材とスペーサー材との間の空気により、圧延時に破裂が生じるなどの不具合を抑制すべく、前記被加工体には、コア材が載置されている側から外部に連通する貫通部を設けることが好ましい。   If necessary, the cover material and the spacer material of the workpiece may be welded by TIG welding or the like. However, in that case, the core material is placed on the workpiece to suppress problems such as rupture during rolling due to the air between the placed core material and the spacer material. It is preferable to provide a penetrating portion communicating from the side to the outside.
また、このとき、圧延加工終了後に金属部材から被覆材を容易に除去し得るように、前記被覆材と前記コア材との間にアルミナ粉などの分離剤を配してもよい。
なお、このような分離剤を用いる場合には、前記被覆材は、最大表面粗さ(Ry)で0.5μm以上の表面粗さを有していることが好ましく、1.0μm以上の表面粗さを有していることがさらに好ましい。
At this time, a separating agent such as alumina powder may be disposed between the covering material and the core material so that the covering material can be easily removed from the metal member after the rolling process is completed.
When such a separating agent is used, the covering material preferably has a maximum surface roughness (Ry) of 0.5 μm or more and a surface roughness of 1.0 μm or more. More preferably, it has a thickness.
以上のごとく、コア材を被覆材で覆った被加工体を圧延ロールにより熱間圧延するには、まず、被加工体を所定温度に加熱する。このとき、より高い温度まで加熱して、圧延ロールによる圧下率を高いものとすることもできるが、一般的な製造設備を使用できる観点から、熱間圧延の温度としては800℃を超え、1350℃以下とすることが好ましい。また、20〜350m/minの圧延速度で複数回圧延を実施して所定形状の金属部材を製造することが好ましい。   As described above, in order to hot-roll a workpiece in which the core material is covered with a coating material, using a rolling roll, the workpiece is first heated to a predetermined temperature. At this time, it can be heated to a higher temperature and the rolling reduction by the rolling roll can be increased, but from the viewpoint of using a general production facility, the hot rolling temperature exceeds 800 ° C. and 1350 It is preferable to set it as below ℃. Moreover, it is preferable to roll a plurality of times at a rolling speed of 20 to 350 m / min to produce a metal member having a predetermined shape.
これは、800℃以下の温度では、コア材に割れが発生するおそれを有し、1350℃を超える温度とする場合には、加熱ヒーター、耐火レンガなどの加熱設備を一般のものよりも耐熱性の高い特別仕様のものとする必要があり、さらには、被覆材の表面酸化膜の形成を促進させて該表面酸化膜が圧延時に脱落して傷を発生させるおそれを有するためである。
また、20〜350m/minの圧延速度が好ましいのは、350m/minを超える圧延速度とすると、圧延ロールに被加工体が噛み込んだ時の衝撃が大きく、コア材が割れてしまうおそれを有するためである。また、20m/min未満の圧延速度としても、圧延速度の低下に見合う、衝撃を和らげる効果が得られないばかりか、加工時間が長くなり、被加工体の温度低下により圧下率を低く設定するする必要があるなど作業性を低下させるおそれを有するためである。
また、複数回の圧延を行うことが好ましいのは、圧下率が大きくなり過ぎてコア材に割れが生じることを抑制でき、しかも、複数回の圧延により、一度の圧延で生じた曲がり、反りを二度目以降の圧延で矯正することが可能となるためである。さらには、加工のバラツキが平均化されて金属部材をより平坦化させ得るという点においても複数回の圧延を行うことが好ましい。
また、このとき、少なくとも1回は、被加工体を水平方向に90度回転させて圧延する幅出し圧延を行うことが好ましい。また、この幅出し圧延は、目標とする製品寸法を得られ易い点において圧延初期に実施することが好ましい。
This is because cracks may occur in the core material at a temperature of 800 ° C. or lower. When the temperature exceeds 1350 ° C., the heating equipment such as a heater and a refractory brick is more heat resistant than a general one. This is because the surface oxide film of the coating material is promoted to be formed and the surface oxide film may fall off during rolling to cause scratches.
Further, the rolling speed of 20 to 350 m / min is preferable. If the rolling speed exceeds 350 m / min, the impact when the workpiece is caught in the rolling roll is large, and the core material may be broken. Because. Moreover, even if the rolling speed is less than 20 m / min, not only the impact reducing effect corresponding to the reduction in the rolling speed is obtained, but also the processing time becomes longer, and the rolling reduction is set low due to the temperature reduction of the workpiece. This is because there is a possibility that workability may be reduced, such as necessity.
In addition, it is preferable to perform the rolling a plurality of times because it is possible to suppress the reduction of the core material from cracking due to excessive reduction, and the bending and warping caused by a single rolling can be suppressed by a plurality of rollings. It is because it becomes possible to correct by the second and subsequent rolling. Furthermore, it is preferable to perform the rolling a plurality of times from the viewpoint that the variation in processing can be averaged to flatten the metal member.
Further, at this time, it is preferable to perform tentering rolling in which the workpiece is rolled by being rotated 90 degrees in the horizontal direction at least once. Further, the tenter rolling is preferably performed at the initial stage of rolling in that the target product dimensions can be easily obtained.
なお、圧延後の被覆材表面の温度分布や、赤熱している赤熱領域の寸法を測定することで内部のコア材の寸法を確認することができる。これは、コア材の存在する部分では、内部からの復熱により被覆材表面がそれ以外の場所よりも高温となるためである。このことにより、被覆材を除去することなくコア材の寸法を特定することができ、寸法精度を高め得る製造方法とすることができる。   In addition, the dimension of an internal core material can be confirmed by measuring the temperature distribution of the surface of the coating material after rolling, and the dimension of the red-hot area which is red hot. This is because, in the portion where the core material is present, the surface of the coating material becomes hotter than other places due to recuperation from the inside. Thereby, the dimension of the core material can be specified without removing the covering material, and the manufacturing method can improve the dimensional accuracy.
なお、本実施形態においては、より高温での加工が必要となるため、空気との接触面積を減らして、酸化皮膜が形成されることを抑制し得る点においてより優れた効果を生じさせ得ることから、融点が1800℃以上の高融点金属材料をコア材に用いているが、本発明においては、コア材を高融点金属材料に限定するものではない。   In this embodiment, since processing at a higher temperature is required, it is possible to reduce the contact area with air and produce a more excellent effect in that the formation of an oxide film can be suppressed. Therefore, although a refractory metal material having a melting point of 1800 ° C. or higher is used for the core material, the core material is not limited to the refractory metal material in the present invention.
(実験例1:実施例1〜3、比較例1〜3)
(実施例1)
(コア材スラブの作成)
コア材1:純Mo、コア材2:Mo−1%Ti(A合金)、コア材3:Mo−1%Ta(B合金)の三種類のコア材を用い、各コア材を粉末焼結により、高さ30mm×幅200mm×長さ500mmのコア材スラブを作成した。
(被加工体の形成)
表面粗さ(Ry=0.5μm)のSS400、表面粗さ(Ry=0.5μm)のSUS304の6mm厚さの被覆材を用いて、高さ42mm×幅300mm×長さ650mmとなるようコア材の前後及び左右に空間を設けて被加工体を形成した。
なお、被加工体同士は、TIG溶接により接合したが、長手方向端部に配された被覆材については、それぞれ50mmの区間TIG溶接を行わず、空気抜き用の貫通孔とした。
(熱間圧延)
直径400mmの圧延ロールを備えた2段可逆圧延機を用いて、1パスの圧下率を約10%として、コア材の高さが60mmとなるまで圧延して金属部材の製造を行った。
このとき加工温度は、1250℃で、圧延速度は100〜250m/minとした。
(評価)
製造された金属部材の表面の傷の状況を目視によって評価した。結果を表1に示す。
(Experimental example 1: Examples 1-3, Comparative Examples 1-3)
Example 1
(Creation of core material slab)
Core material 1: Pure Mo, Core material 2: Mo-1% Ti (A alloy), Core material 3: Mo-1% Ta (B alloy), three kinds of core materials are used, and each core material is powder-sintered. Thus, a core material slab having a height of 30 mm, a width of 200 mm, and a length of 500 mm was prepared.
(Forming the workpiece)
Using a 6 mm thick coating material of SS400 with surface roughness (Ry = 0.5 μm) and SUS304 with surface roughness (Ry = 0.5 μm), the core is 42 mm high × 300 mm wide × 650 mm long A workpiece was formed by providing spaces before and after and on the left and right sides of the material.
In addition, although the to-be-processed bodies were joined by TIG welding, about the coating | coated material distribute | arranged to the longitudinal direction edge part, 50 mm area TIG welding was not performed, but it was set as the through-hole for air venting.
(Hot rolling)
Using a two-stage reversible rolling mill equipped with a rolling roll having a diameter of 400 mm, the rolling reduction rate of one pass was about 10%, and the core member was rolled until the height of the core material became 60 mm to produce a metal member.
At this time, the processing temperature was 1250 ° C. and the rolling speed was 100 to 250 m / min.
(Evaluation)
The state of scratches on the surface of the manufactured metal member was visually evaluated. The results are shown in Table 1.
(実施例2)
Moに代えて、コア材1:純Cr、コア材2:Cr−1%Mo、コア材3:Cr−3%Moを用い、1280℃の加工温度で熱間圧延した以外は、実施例1と同様に金属部材を製造した。
(実施例3)
Moに代えて、コア材1:純W、コア材2:50%W−50%Moを用い、1150℃の加工温度で、圧延速度は100〜200m/minで熱間圧延した以外は、実施例1と同様に金属部材を製造した。
(Example 2)
Example 1 except that instead of Mo, core material 1: pure Cr, core material 2: Cr-1% Mo, core material 3: Cr-3% Mo was used and hot rolled at a processing temperature of 1280 ° C. A metal member was produced in the same manner as described above.
(Example 3)
Implemented except that instead of Mo, core material 1: pure W, core material 2: 50% W-50% Mo was used, and the rolling speed was 100 to 200 m / min at a processing temperature of 1150 ° C. A metal member was produced in the same manner as in Example 1.
(比較例1)
表面粗さ(Ry=0.3μm)のSS400、表面粗さ(Ry=0.3μm)のSUS304を用いたこと以外は、実施例1と同様に金属部材を製造した。
(比較例2)
表面粗さ(Ry=0.3μm)のSS400、表面粗さ(Ry=0.3μm)のSUS304を用いたこと以外は、実施例2と同様に金属部材を製造した。
(比較例3)
表面粗さ(Ry=0.3μm)のSS400、表面粗さ(Ry=0.3μm)のSUS304を用いたこと以外は、実施例3と同様に金属部材を製造した。
(Comparative Example 1)
A metal member was produced in the same manner as in Example 1 except that SS400 having a surface roughness (Ry = 0.3 μm) and SUS304 having a surface roughness (Ry = 0.3 μm) were used.
(Comparative Example 2)
A metal member was produced in the same manner as in Example 2 except that SS400 having a surface roughness (Ry = 0.3 μm) and SUS304 having a surface roughness (Ry = 0.3 μm) were used.
(Comparative Example 3)
A metal member was produced in the same manner as in Example 3 except that SS400 having a surface roughness (Ry = 0.3 μm) and SUS304 having a surface roughness (Ry = 0.3 μm) were used.
(実験例2:実施例4〜11)
(実施例4〜11)
加工温度を、700〜1350℃において実施した以外は、実施例1と同様に金属部材を製造した。各金属部材の評価結果を表2に示す。
(実験例3:実施例12〜19)
(実施例12〜19)
コア材スラブをHIPにて作成した以外は実施例4〜11と同様に金属部材を製造した。各金属部材の評価結果を表3に示す。
(Experimental example 2: Examples 4 to 11)
(Examples 4 to 11)
A metal member was produced in the same manner as in Example 1 except that the processing temperature was 700 to 1350 ° C. Table 2 shows the evaluation results of each metal member.
(Experimental example 3: Examples 12 to 19)
(Examples 12 to 19)
A metal member was produced in the same manner as in Examples 4 to 11 except that the core material slab was prepared by HIP. Table 3 shows the evaluation results of each metal member.
(実験例4:実施例20〜28)
(実施例20〜28)
加工温度を、700〜1350℃において実施した以外は、実施例1と同様に金属部材を製造した。その際の、被覆材表面温度を高温タイプの接触式温度計で測定し温度分布から、内部のコア材位置(寸法)特定が可能かどうか、あるいは、赤熱部(赤黒〜赤〜赤白)領域からコア材位置(寸法)特定が可能かどうかの確認した評価結果を表4に示す。
(Experimental example 4: Examples 20 to 28)
(Examples 20 to 28)
A metal member was produced in the same manner as in Example 1 except that the processing temperature was 700 to 1350 ° C. At that time, the surface temperature of the coating material is measured with a high-temperature type contact thermometer, and the internal core material position (dimension) can be specified from the temperature distribution, or the red hot area (red black to red to red white) Table 4 shows the evaluation results for confirming whether the core material position (dimension) can be specified.
なお、表1中の記号「◎」は、コア材表面に傷がなかったことを示し、「○」は、コア材表面に実質上問題とならない程度のかすかな傷が発生したことを示し、「×」は、問題となる傷が発生したことを示す。
以上のように、表1から、Ry0.35μm以上の表面粗さを有している被覆材を用いることで金属部材表面の傷つきを抑制し得ることがわかる。
In addition, the symbol “表” in Table 1 indicates that the surface of the core material was not damaged, and “◯” indicates that the surface of the core material was slightly damaged so as not to cause a problem. “X” indicates that a flaw causing a problem occurred.
As described above, it can be seen from Table 1 that scratches on the surface of the metal member can be suppressed by using a covering material having a surface roughness of Ry 0.35 μm or more.
表2及び表3より、高融点金属材料を用いたコア材については、800℃を超え1350℃以下の加工温度とすることで、加工性が良好となることがわかる。 From Table 2 and Table 3, it can be seen that the core material using the refractory metal material has good workability when the processing temperature is higher than 800 ° C and lower than 1350 ° C.
表4の結果から高融点金属材料を800〜1350℃の温度で圧延した場合は、被覆材を除去することなくコア材の寸法を特定することができ、寸法精度を高め得る製造方法とすることができることがわかる。 From the results shown in Table 4, when the refractory metal material is rolled at a temperature of 800 to 1350 ° C., the core material dimensions can be specified without removing the covering material, and the manufacturing method can improve the dimensional accuracy. You can see that

Claims (10)

  1. 金属材料からなるコア材と、前記コア材よりも熱間変形抵抗の低い金属材料からなる被覆材とを用い、前記コア材を前記被覆材で覆った状態で圧延ロールにより熱間圧延するパック圧延を実施して前記コア材を金属部材に加工する金属部材の製造方法であって、
    コア材と接触する接触面が最大表面粗さ(Ry)で0.35μm以上の表面粗さを有している被覆材を前記圧延ロールと前記コア材との間に配して熱間圧延することを特徴とする金属部材の製造方法。
    Pack rolling using a core material made of a metal material and a coating material made of a metal material having a lower resistance to hot deformation than the core material, and hot rolling with a rolling roll in a state where the core material is covered with the coating material A method of manufacturing a metal member by processing the core material into a metal member,
    A coating material having a contact surface in contact with the core material having a maximum surface roughness (Ry) of 0.35 μm or more is hot-rolled by placing it between the rolling roll and the core material. A method for producing a metal member.
  2. 前記コア材に用いる金属材料が、融点1800℃以上の高融点金属材料である請求項1記載の金属部材の製造方法。   The method for producing a metal member according to claim 1, wherein the metal material used for the core material is a refractory metal material having a melting point of 1800 ° C or higher.
  3. 前記圧延ロールの圧延速度が20〜350m/minである請求項2記載の金属部材の製造方法。   The method for producing a metal member according to claim 2, wherein a rolling speed of the rolling roll is 20 to 350 m / min.
  4. 前記高融点金属材料が、W、Mo、Ta、Crの何れかを主成分とする高融点金属材料である請求項2又は3記載の金属部材の製造方法。   The method for producing a metal member according to claim 2 or 3, wherein the refractory metal material is a refractory metal material mainly containing any one of W, Mo, Ta, and Cr.
  5. 炭素鋼製又はステンレス鋼製の被覆材が用いられる請求項2乃至4の何れかに記載の金属部材の製造方法。   The method for producing a metal member according to any one of claims 2 to 4, wherein a coating material made of carbon steel or stainless steel is used.
  6. 前記高融点金属材料を用い、800℃を超え1350℃以下の温度で熱間圧延する請求項2乃至5の何れかに記載の金属部材の製造方法。   The method for producing a metal member according to any one of claims 2 to 5, wherein the refractory metal material is used and hot-rolled at a temperature exceeding 800 ° C and not exceeding 1350 ° C.
  7. コア材を複数回熱間圧延して金属部材に加工する請求項6記載の金属部材の製造方法。   The method for producing a metal member according to claim 6, wherein the core material is hot rolled a plurality of times to be processed into a metal member.
  8. 前記複数回の熱間圧延の内、少なくとも1回の幅出し圧延を行う請求項7記載の金属部材の製造方法。   The metal member manufacturing method according to claim 7, wherein at least one tenth rolling is performed among the plurality of hot rollings.
  9. 圧延された被覆材の表面温度分布を測定する請求項6乃至8のいずれかに記載の金属部材の製造方法。   The method for producing a metal member according to claim 6, wherein the surface temperature distribution of the rolled coating material is measured.
  10. 圧延された被覆材の表面赤熱領域の寸法測定を実施する請求項6乃至9のいずれかに記載の金属部材の製造方法。   The method for producing a metal member according to any one of claims 6 to 9, wherein the measurement of the dimension of the surface red hot region of the rolled coating material is performed.
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