JP2019030896A - クラッド材およびクラッド材の製造方法 - Google Patents
クラッド材およびクラッド材の製造方法 Download PDFInfo
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- JP2019030896A JP2019030896A JP2017154123A JP2017154123A JP2019030896A JP 2019030896 A JP2019030896 A JP 2019030896A JP 2017154123 A JP2017154123 A JP 2017154123A JP 2017154123 A JP2017154123 A JP 2017154123A JP 2019030896 A JP2019030896 A JP 2019030896A
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Abstract
Description
まず、図1および図2を参照して、本発明の一実施形態(第1実施形態)による携帯機器100の概略的な構成について説明する。
シャーシ3は、図2に示すように、ステンレス鋼により構成されるSUS層31と、CuまたはCu合金により構成されるCu層32と、ステンレス鋼により構成されるSUS層33とがこの順に積層された3層構造のクラッド材30から構成されている。Cu層32は、SUS層31のZ2側の下面に圧延接合されているとともに、SUS層33のZ1側の上面に圧延接合されている。なお、SUS層31とCu層32との界面IaおよびCu層32とSUS層33との界面Ibにおいて、互いの層は拡散焼鈍により原子間接合を形成して強固に接合している。なお、SUS層31、Cu層32およびSUS層33は、それぞれ、本発明の「第1層」、「第2層」および「第3層」の一例である。
次に、図2〜図5を参照して、本発明の一実施形態によるシャーシ3を構成するクラッド材30の製造方法を説明する。
ここで、本実施形態の製造方法では、拡散焼鈍前(中間圧延後)のCu板132における厚みt4d(図4参照)を、軟化焼鈍後(調質圧延前)のCu板132における厚みt4a(図3参照)の20%以上にする。つまり、厚みt4dが厚みt4aの20%以上になるように、調質圧延、クラッド圧延および中間圧延での各々の圧下率が設定されている。言い換えると、調質圧延、クラッド圧延および中間圧延での合計の圧下率((t4a−t4d)/t4a×100(%))が、80%以下になるように、調質圧延、クラッド圧延および中間圧延の圧下率が各々設定されている。なお、厚みt4dが厚みt4aの20%以上になるのであれば、調質圧延、クラッド圧延および中間圧延の圧下率は適宜変更することが可能である。また、厚みt4dは厚みt4aの20%以上であればよいが、厚みt4dと厚みt4aとの差がより大きくなるとクラッド材30の圧延効率が高まるため、実用上の観点において、厚みt4dは厚みt4aの25%以上50%以下であるのが好ましい。
ここで、ステンレス鋼により構成されるSUS板131およびSUS板133は機械的強度が大きく延性が低く、CuまたはCu合金により構成されるCu板132は機械的強度が小さく延性が高いので、クラッド圧延を行う前に、SUS板131およびSUS板133とCu板132との延性を近づけておくのが好ましい。これにより、クラッド圧延時に、SUS板131および133の厚みが圧延方向で不均一になるのを抑制することができるとともに、十分に接合された圧接材130を容易に作製することが可能である。したがって、焼鈍されていない場合と比べて組織が軟化されて機械的強度が小さくなったSUS板131および133を用いるとともに、焼鈍されている場合と比べて組織が加工硬化されて機械的強度が大きくなったCu板132を用いるのが好ましい。そこで、調質圧延を行ってCu板132の厚みをある程度小さくすることにより、Cu板132の組織を加工硬化させるのが好ましい。一方で、調質圧延の後にクラッド圧延および中間圧延を行う必要があるため、調質圧延において過度に圧延を行うのはクラッド材30のCu層32の結晶の粗大化を抑制する観点から好ましくない。
また、クラッド圧延において、圧下率が小さすぎると、SUS板131、Cu板132およびSUS板133が十分に接合されない虞がある。そこで、クラッド材30のCu層32の結晶の粗大化への影響を抑制しつつ、クラッド材30に十分な接合強度を得るために、クラッド圧延において、クラッド圧延後のCu板132における厚みt4cが、クラッド圧延前のCu板132における厚みt4bの35%以上50%以下になるようにクラッド圧延するのが好ましい。言い換えると、クラッド圧延における圧下率((t4b−t4c)/t4b×100(%))は、50%以上65%以下であるのが好ましい。なお、クラッド材30のCu層32の結晶の粗大化を抑制する観点からは、厚みt4cは厚みt4bの40%以上であるのが好ましい。また、クラッド材30に十分な接合強度を得る観点からは、厚みt4cは厚みt4bの40%以下であるのがより好ましい。
また、中間圧延では、クラッド材30のCu層32の結晶の粗大化への影響を抑制しつつ厚みの調整が可能なように、圧下率が適宜設定される。つまり、中間圧延では、調質圧延およびクラッド圧延を経たCu板132が、最終的に、所定の範囲(t4d≧t4a×0.2)を満たす厚みt4dになるように圧下率が適宜設定される。
また、拡散焼鈍では、圧接材130に対して850℃以上1000℃以下の温度条件下で拡散焼鈍を行う。たとえば、図5に一例として示すSUS316Lの軟化曲線においては、温度条件が750℃の場合に比べて、温度条件が800℃の場合にはSUS316Lの断面の硬さがほとんど低下していないものの、温度条件が850℃の場合にはSUS316Lの断面の硬さが十分に低下している。したがって、圧接材130に対して850℃以上の温度条件下で拡散焼鈍を行うことにより、ステンレス鋼により構成されるSUS板131およびSUS板133と、ステンレス鋼よりも再結晶温度が低いCuまたはCu合金により構成されるCu板132とにおいて、共に組織が十分に軟化すると考えられる。また、850℃の温度条件下ではSUS板131および133の軟化の速度が小さく、組織の十分な軟化および元素の適度な拡散に時間がかかり、タクトタイムが長くなると考えられる。このため、タクトタイムの短縮の観点から、900℃以上の温度条件下で拡散焼鈍を行うのが好ましい。なお、SUS316L以外のステンレス鋼であっても同様の軟化曲線が得られると考えられるので、SUS316L以外のステンレス鋼であっても850℃以上1000℃以下の温度条件下で拡散焼鈍を行うのがよいと考えられる。
本実施形態(第1実施形態)では、以下のような効果を得ることができる。
次に、図2〜図4、図6および図7を参照して、本発明の効果を確認するために行った、加工性、機械的強度および磁気特性の測定について説明する。
31 SUS層(第1層)
32 Cu層(第2層)
33 SUS層(第3層)
130 圧接材
131 SUS板(第1金属板)
132 Cu板(第2金属板)
133 SUS板(第3金属板)
Claims (12)
- ステンレス鋼により構成される第1層と、
CuまたはCu合金により構成され、前記第1層に圧延接合された第2層と、を備え、
JIS H 0501の比較法により測定される前記第2層の結晶粒度が、0.150mm以下である、クラッド材。 - 前記第2層の結晶粒度が、0.130mm以下である、請求項1に記載のクラッド材。
- ステンレス鋼により構成され、前記第2層の前記第1層とは反対側に圧延接合された第3層をさらに備える、請求項1または2に記載のクラッド材。
- 前記ステンレス鋼は、オーステナイト系ステンレス鋼である、請求項1〜3のいずれか1項に記載のクラッド材。
- ステンレス鋼により構成される第1金属板を軟化させ、CuまたはCu合金により構成される第2金属板を軟化させる、軟化焼鈍と、
前記軟化焼鈍を経た前記第1金属板と前記第2金属板とを互いに積層させた状態で圧延して接合することにより圧接材を作製するクラッド圧延と、
前記圧接材に対して拡散処理を行う拡散焼鈍と、を含み、
前記拡散焼鈍前の前記圧接材における前記第2金属板の厚みを前記軟化焼鈍後の前記第2金属板の厚みの20%以上とすることにより、ステンレス鋼により構成される第1層と、CuまたはCu合金により構成され、前記第1層に圧延接合された第2層と、を備え、JIS H 0501の比較法により測定される前記第2層の結晶粒度が0.150mm以下となるクラッド材を作製する、クラッド材の製造方法。 - 前記拡散焼鈍前の前記圧接材における前記第2金属板の厚みを前記軟化焼鈍後の前記第2金属板の厚みの25%以上50%以下とする、請求項5に記載のクラッド材の製造方法。
- 前記拡散焼鈍を850℃以上1000℃以下の温度条件下で行う、請求項5または6に記載のクラッド材の製造方法。
- 前記拡散焼鈍を900℃以上1000℃以下の温度条件下で行う、請求項7に記載のクラッド材の製造方法。
- 前記軟化焼鈍後、前記クラッド圧延前に、前記第2金属板を硬化させる調質圧延を行うことによって、前記調質圧延後の前記第2金属板の厚みを前記軟化焼鈍後の前記第2金属板の厚みの60%以上100%未満にする、請求項5〜8のいずれか1項に記載のクラッド材の製造方法。
- 前記調質圧延後の前記第2金属板の厚みを前記軟化焼鈍後の前記第2金属板の厚みの80%以上100%未満にする、請求項9に記載のクラッド材の製造方法。
- 前記第2層の結晶粒度が0.130mm以下となる前記クラッド材を作製する、請求項5〜10のいずれか1項に記載のクラッド材の製造方法。
- 前記軟化焼鈍においては、ステンレス鋼により構成される第3金属板を軟化させ、
前記クラッド圧延においては、前記軟化焼鈍を経た前記第1金属板と前記第2金属板と前記第3金属板とをこの順で積層させた状態で圧延して接合することにより圧接材を作製することにより、
ステンレス鋼により構成される第1層と、CuまたはCu合金により構成され、前記第1層に圧延接合された第2層と、ステンレス鋼により構成され、前記第2層の前記第1層とは反対側に圧延接合された第3層と、を備え、前記第2層の結晶粒度が0.150mm以下となるクラッド材を作製する、請求項5〜11のいずれか1項に記載のクラッド材の製造方法。
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CN109382411A (zh) | 2019-02-26 |
CN109382411B (zh) | 2020-06-16 |
CN111229832A (zh) | 2020-06-05 |
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