JPH0253136B2 - - Google Patents
Info
- Publication number
- JPH0253136B2 JPH0253136B2 JP61015357A JP1535786A JPH0253136B2 JP H0253136 B2 JPH0253136 B2 JP H0253136B2 JP 61015357 A JP61015357 A JP 61015357A JP 1535786 A JP1535786 A JP 1535786A JP H0253136 B2 JPH0253136 B2 JP H0253136B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- bimetal
- atmosphere
- treatment
- expansion
- 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
- 229910045601 alloy Inorganic materials 0.000 claims description 22
- 239000000956 alloy Substances 0.000 claims description 22
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 19
- 230000032683 aging Effects 0.000 claims description 18
- 238000005530 etching Methods 0.000 claims description 10
- 230000035882 stress Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 238000002845 discoloration Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000005097 cold rolling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000004649 discoloration prevention Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Details Of Measuring And Other Instruments (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Laminated Bodies (AREA)
Description
利用産業分野
この発明は、２枚重ねあるいは３枚重ねのバイ
メタルの製造方法に係り、スタンピング加工につ
づいて施される大気中での時効処理に伴ない、表
面材質識別用エツチングマークが変色により不鮮
明となるのを防止でき、かつ該時効処理後の寸
法、形状的なばらつきを防止できるバイメタルの
製造方法に関する。
背景技術
一般に、高膨脹側合金と低膨脹側合金とからな
る２枚重ねのバイメタルは、熱制御機器用部品等
に用いられ、また、高膨脹側合金と低膨脹側合金
との間に中間層合金を介在圧着した３枚重ねのバ
イメタルは、電流ブレーカー用等に用いられる
が、いずれも同様の工程で製造される。
一例として、２枚重ねのバイメタルの製造方法
について説明すると、まず、高膨脹側合金と低膨
脹側合金を冷間圧接し、拡散焼鈍、中間冷延、中
間焼鈍、つづいて仕上冷延を施す。
その後、通常はバイメタルの材質の違いを識別
するために、いずれか片面にエツチングマークを
施し、必要に応じて切断、平坦度の矯正をおこな
つたのち、所要部品形状に、スタンピング加工
し、さらに時効処理されて製品化する。
上記の時効処理は、通常大気中にて行なわれる
ため、処理品表面が濃青色に変色し、前記エツチ
ングマークが不鮮明になり、バイメタルの材質区
別が不明確となり、商品価値が低下する問題があ
つた。
そこでスタンピング加工後の時効処理を、無酸
化雰囲気あるいは真空中で行なうことが提案され
ている。同処理により変色は防止できるが、スタ
ンピング加工後の製品を時効処理すると、寸法、
形状的ばらつきを生じ易く、寸法、形状精度公差
の厳しいバイメタルの品質低下を生じる問題があ
つた。
発明の目的
この発明は、従来のバイメタルの製造方法にお
ける欠点を解決し、大気中時効処理に伴なう変色
によりエツチングマークが不鮮明となるのを防止
し、さらに時効処理後の寸法、形状的ばらつきの
発生を防止でき、品質のすぐれたバイメタルが得
られる製造方法を目的としている。
発明の構成と効果
この発明は、大気中時効処理に伴なう変色防止
及び製品品質向上を目的に種々検討した結果、エ
ツチングマークを施したバイメタル板に、特定露
点の水素雰囲気での加熱処理を施すことにより、
該変色の防止とともに、大気中時効処理後の寸
法、形状的ばらつきを減少させることができるこ
とを知見したものである。
すなわち、この発明は、
Ni17.5wt％〜26wt％に
Cr3.1wt％〜12wt％、Mn5wt％〜6wt％、
Mo4wt％〜6wt％の１種を含有するFe合金か
らなる高膨脹側合金板を一面に有し、
Ni35wt％〜50wt％またはCr13wt％〜18wt％
含有のFe合金からなる低膨脹側合金板を他面に
有する２枚重ねまたは３枚重ねのバイメタル板を
圧接して仕上げたのち、
該バイメタル板のいずれか一方面に識別用エツ
チングマークを施し、さらに、
後続の大気中時効処理に伴なう表面変色防止処
理として、
露点−60℃〜40℃のH2雰囲気中にて、
温度200℃〜500℃の焼付け応力除去処理を行な
い、
その後スタンピング加工に続いて大気中時効処
理を行なうことを特徴とするバイメタルの製造方
法である。
この発明は、該バイメタル板のいずれか一方面
に識別用エツチングマークを施した後、露点−60
℃〜40℃のH2雰囲気中にて、温度200℃〜500℃、
30秒以上、３時間以下の焼付け応力除去処理を行
ない、バイメタル表面に極薄不動態膜を形成させ
ることにより、スタンピング加工に続く大気中で
の時効処理後に、材料表面が濃青色に変色するの
を防止し、エツチングマークが鮮明で材質識別が
容易になり、また、焼付け応力除去処理により、
時効処理時の寸法、形状的なばらつきが減少する
効果が得られる。
発明の好ましい実施態様
この発明において、高膨脹側Fe合金は、Niが
17.5wt％未満では熱膨脹係数が小さくなりすぎ、
また、26wt％を越えると同様に熱膨脹係数が小
さくなりすぎて好ましくない。また、Mnが5wt
％未満、Crが3.1wt％未満、Mo4wt％未満では、
高膨脹特性の安定性の点で好ましくなく、Mnが
6wt％を越えると耐食性が悪くなり、また、Crが
12wt％を越えたり、Moが6wt％を越えると加工
性が悪くなるため好ましくない。
従つて、高膨脹側合金は、Ni17.5wt％〜26wt
％にMn5wt％〜6wt％またはCr3.1wt％〜12wt％
あるいはMo4wt％〜6wt％の１種を含有するFe
合金とし、特に、
Ni19.5〜20.5−Cr5.5〜6.5−Fe合金（wt％）、
Ni21.5〜22.5−Cr3.1〜3.6−Fe合金（wt％）、
Ni17.5〜18.5−Cr11.0〜12.0−Fe合金（wt％）、
Ni24〜26−Mo4〜６−Fe合金（wt％）、
Ni22.5〜23.5−Mn5.0〜6.0−Fe合金（wt％）が
好ましい。
また、低膨脹側Fe合金は、Niが35wt％未満、
Crが13wt％未満では熱膨脹係数が大きくなりす
ぎ、また、Niが50wt％を越え、またCrが18wt％
を越えると同様に熱膨脹係数が大きくなりすぎて
好ましくないため、Ni35wt％〜50wt％、または
Cr13wt％〜18wt％含有のFe合金とし、アンバー
合金、Ni38wt％−Fe合金、Ni42wt％−Fe合金、
Cr13〜18wt％−Fe合金が好ましい。
中間層合金は、用途等に応じて適宜選択すれば
よい。
この発明の特徴である焼付け応力除去処理にお
いて、H2雰囲気の露点が−60℃未満では、バイ
メタル表面に形成される不動態被膜の厚みが極め
て薄く、大気中時効処理に伴なう製品表面の変色
防止効果が少なく、また、H2雰囲気露点が40℃
を越えると、焼付け処理品が黄色に変色するため
好ましくない。従つて、H2雰囲気の露点は−60
℃〜40℃とする。
焼付け応力除去処理温度が200℃未満では、生
成する不動態被膜厚みが薄く、大気中時効処理に
伴なう製品表面の変色防止効果が少なく、また、
処理温度が500℃を越える材料が軟化して、材料
のばね姓が劣化するため好ましくない。処理温度
は200℃〜500℃とする。
また、処理時間は、30秒未満では、不動態被膜
の生成が不十分であり、また、３時間を越える
と、変色防止効果が飽和し、コスト的にも好まし
くない。また、好ましい処理時間は、１分から60
分である。
実施例
実施例 １
高膨脹側合金板に、20Ni−6Cr−Fe合金（wt
％）を使用し、低膨脹側合金板に、36Ni−Fe合
金（wt％）を使用し、冷間圧接し、拡散焼鈍、
中間冷延、中間焼鈍、つづいて仕上冷延して、板
厚0.4mm×板幅30mmのバイメタル帯板を製造し、
片面にエツチングマークを施した。
次に、露点−40℃のH2雰囲気中にて、温度400
℃、１分間の焼付け応力除去処理を行なつた。
その後、平坦度矯正を行なつたバイメタル板
を、0.4mm×25mm×50mm寸法に打ち抜き加工及び
曲げ加工の成形加工し、さらに大気中で、350℃、
１時間の時効処理を行ない、得られたこの発明に
よるバイメタルの外観状況、変形量（反り）を観
察、測定し、その結果を第１表に示す。
また、比較のため、同一の高膨脹側合金及び低
膨脹側合金を使用し、H2雰囲気中の焼付け応力
除去処理を施さない以外は、同一工程、条件で製
造した２枚重ねのバイメタルの時効処理後の外観
状況及び変形量（反り）を観察、測定し、結果を
第１表に示す。
Field of Application This invention relates to a method for manufacturing two-ply or three-ply bimetals, in which the etching mark for identifying the surface material becomes unclear due to discoloration due to aging treatment in the atmosphere that is performed following stamping. The present invention relates to a method for manufacturing a bimetal that can prevent such occurrence and also prevent variations in size and shape after the aging treatment. BACKGROUND ART In general, a two-layer bimetal consisting of a high expansion alloy and a low expansion alloy is used for parts for thermal control equipment, etc., and an intermediate layer is formed between the high expansion alloy and the low expansion alloy. A three-ply bimetal crimped with an alloy interposed therebetween is used for current breakers, etc., and all of them are manufactured using the same process. As an example, to explain a method for manufacturing a two-layer bimetal, first, a high-expansion alloy and a low-expansion alloy are cold-welded, followed by diffusion annealing, intermediate cold rolling, intermediate annealing, and final cold rolling. After that, usually an etching mark is made on one side of the bimetal to identify the difference in material, and after cutting and flatness correction as necessary, stamping is performed to the required part shape, and then It is aged and turned into a product. Since the above aging treatment is usually carried out in the atmosphere, the surface of the treated product turns dark blue, the etching marks become unclear, the material distinction of the bimetal becomes unclear, and the product value decreases. Ta. Therefore, it has been proposed that the aging treatment after stamping be performed in a non-oxidizing atmosphere or in a vacuum. This process can prevent discoloration, but if the product is aged after stamping, the dimensions and
There was a problem that the quality of the bimetal, which is prone to shape variations and has strict dimensional and shape accuracy tolerances, deteriorated. Purpose of the Invention The present invention solves the drawbacks of conventional bimetal manufacturing methods, prevents etching marks from becoming unclear due to discoloration due to aging treatment in the air, and also prevents variations in size and shape after aging treatment. The aim is to create a manufacturing method that can prevent the occurrence of metallurgy and produce bimetals of excellent quality. Structure and Effects of the Invention As a result of various studies aimed at preventing discoloration due to atmospheric aging treatment and improving product quality, the present invention was developed by applying heat treatment to a bimetal plate with etching marks in a hydrogen atmosphere at a specific dew point. By applying
It has been discovered that it is possible to prevent the discoloration and to reduce variations in size and shape after aging in the atmosphere. That is, in this invention, a high expansion side alloy plate made of an Fe alloy containing 17.5wt% to 26wt% of Ni, 3.1wt% to 12wt% of Cr, 5wt% to 6wt% of Mn, and 4wt% to 6wt% of Mo is coated on one side. Ni35wt%~50wt% or Cr13wt%~18wt%
After pressing and finishing two or three stacked bimetal plates having a low-expansion side alloy plate made of a containing Fe alloy on the other side, an etching mark for identification is applied to one side of the bimetal plates, Furthermore, as a treatment to prevent surface discoloration due to the subsequent aging treatment in the air, stress relief treatment is performed by baking at a temperature of 200℃ to 500℃ in an H2 atmosphere with a dew point of -60℃ to 40℃, followed by stamping processing. This is a method for producing bimetals, which is characterized in that the method is followed by aging treatment in the atmosphere. In this invention, after making an identification etching mark on either side of the bimetal plate, a dew point of -60
Temperature 200℃~500℃, in H2 atmosphere of ℃~40℃,
By performing baking stress relief treatment for 30 seconds or more and 3 hours or less to form an ultra-thin passive film on the bimetal surface, the material surface will not turn dark blue after stamping and aging in the atmosphere. The etching marks are clear, making it easy to identify the material, and the baking stress relief process
The effect of reducing dimensional and shape variations during aging treatment can be obtained. Preferred Embodiment of the Invention In this invention, the high-expansion Fe alloy contains Ni.
If it is less than 17.5wt%, the coefficient of thermal expansion will be too small,
Moreover, if it exceeds 26 wt%, the coefficient of thermal expansion becomes too small, which is not preferable. Also, Mn is 5wt
%, Cr is less than 3.1wt%, Mo4wt% is less than
It is unfavorable in terms of stability of high expansion characteristics, and Mn is
If it exceeds 6wt%, corrosion resistance will deteriorate and Cr
If it exceeds 12wt% or if Mo exceeds 6wt%, workability will deteriorate, which is not preferable. Therefore, the high expansion side alloy is Ni17.5wt%~26wt
%Mn5wt%~6wt% or Cr3.1wt%~12wt%
Or Fe containing one of Mo4wt% to 6wt%
Alloys, especially Ni19.5~20.5−Cr5.5−6.5−Fe alloy (wt%), Ni21.5−22.5−Cr3.1−3.6−Fe alloy (wt%), Ni17.5−18.5−Cr11 .0-12.0-Fe alloy (wt%), Ni24-26-Mo4-6-Fe alloy (wt%), Ni22.5-23.5-Mn5.0-6.0-Fe alloy (wt%) are preferred. In addition, the low expansion side Fe alloy contains less than 35wt% Ni,
If Cr is less than 13wt%, the thermal expansion coefficient becomes too large, and if Ni exceeds 50wt% and Cr is 18wt%
Ni35wt% to 50wt% or
Fe alloy containing Cr13wt% to 18wt%, amber alloy, Ni38wt%-Fe alloy, Ni42wt%-Fe alloy,
A Cr13-18wt%-Fe alloy is preferred. The intermediate layer alloy may be appropriately selected depending on the application and the like. In the baking stress relief treatment that is a feature of this invention, when the dew point of the H2 atmosphere is less than -60℃, the thickness of the passive film formed on the bimetal surface is extremely thin, and the product surface due to atmospheric aging treatment is It has little discoloration prevention effect, and the H2 atmosphere dew point is 40℃.
Exceeding this is not preferable because the baked product will turn yellow. Therefore, the dew point of H2 atmosphere is −60
The temperature should be between ℃ and 40℃. If the baking stress relief treatment temperature is less than 200℃, the thickness of the passive film formed will be thin, and the effect of preventing discoloration of the product surface due to aging treatment in the atmosphere will be small.
Processing temperatures exceeding 500°C soften the material and deteriorate the spring properties of the material, which is undesirable. The processing temperature is 200°C to 500°C. Furthermore, if the treatment time is less than 30 seconds, the formation of a passive film will be insufficient, and if it exceeds 3 hours, the discoloration prevention effect will be saturated, which is not preferable in terms of cost. In addition, the preferred processing time is 1 minute to 60 minutes.
It's a minute. Examples Example 1 20Ni-6Cr-Fe alloy (wt
%), and 36Ni-Fe alloy (wt%) was used for the low expansion side alloy plate, cold welded, diffusion annealed,
Intermediate cold rolling, intermediate annealing, and final cold rolling were performed to produce a bimetal strip with a thickness of 0.4 mm and a width of 30 mm.
Etched marks on one side. Next, in an H2 atmosphere with a dew point of -40℃, the temperature was 400℃.
C. for 1 minute to remove stress. Thereafter, the bimetal plate that had undergone flatness correction was punched and bent into a size of 0.4 mm x 25 mm x 50 mm, and then heated at 350°C in the atmosphere.
After aging for 1 hour, the appearance and deformation (warpage) of the obtained bimetal according to the present invention were observed and measured, and the results are shown in Table 1. In addition, for comparison, we used the same high-expansion side alloy and low-expansion side alloy, and compared the aging results of two-layer bimetals manufactured under the same process and conditions, except that baking stress relief treatment in an H2 atmosphere was not performed. The appearance and amount of deformation (warpage) after treatment were observed and measured, and the results are shown in Table 1.
【表】
実施例 ２
高膨脹側合金板に、23Ni−5Mn−Fe合金（wt
％）を使用し、低膨脹側合金板に、36Ni−Fe合
金（wt％）を使用し、さらに両者間の中間層合
金に、0.5Co−Ni合金を用いて、冷間圧接し、拡
散焼鈍、中間冷延、中間焼鈍、つづいて仕上冷延
して、板厚0.2mm×板幅20mmのバイメタル帯板を
製造し、片面にエツチングマークを施した。
次に、露点−15℃のH2雰囲気中にて、温度350
℃、２分間の焼付け応力除去処理を行なつた。
その後、平坦度矯正を行なつたバイメタル板
を、厚み0.2mm×18mmφ寸法に打ち抜き加工の成
形加工を行ない、さらに大気中で、350℃、１時
間の時効処理を行ない、得られたこの発明による
バイメタルの外観状況、変形量（反り）を観察、
測定し、その結果を第２表に示す。
また、比較のため、同一の高膨脹側合金及び低
膨脹側合金を使用し、H2雰囲気中の焼付け応力
除去処理を施さない以外は、同一工程、条件で製
造した３枚重ねのバイメタルの時効処理後の外観
状況及び変形量（反り）を観察、測定し、結果を
第２表に示す。[Table] Example 2 23Ni-5Mn-Fe alloy (wt
%), 36Ni-Fe alloy (wt%) is used for the low expansion side alloy plate, and 0.5Co-Ni alloy is used as the intermediate layer alloy between the two, cold welded and diffusion annealed. , intermediate cold rolling, intermediate annealing, and final cold rolling to produce a bimetallic strip with a thickness of 0.2 mm and a width of 20 mm, and etching marks were made on one side. Next, in a H2 atmosphere with a dew point of -15 °C, the temperature was 350 °C.
A baking stress relief treatment was performed at ℃ for 2 minutes. Thereafter, the bimetal plate that had undergone flatness correction was punched and formed into a size of 0.2 mm in thickness x 18 mm in diameter, and then aged in the atmosphere at 350°C for 1 hour. Observe the appearance condition and amount of deformation (warpage) of the bimetal,
The results are shown in Table 2. In addition, for comparison, the aging of a three-ply bimetal fabricated using the same high-expansion alloy and low-expansion alloy and using the same process and conditions except that baking stress relief treatment in an H2 atmosphere was not performed. The appearance and amount of deformation (warpage) after treatment were observed and measured, and the results are shown in Table 2.
Claims (1)
Mo4wt％〜6wt％の１種を含有するFe合金から
なる高膨脹側合金板を一面に有し、 Ni35wt％〜50wt％またはCr13wt％〜18wt％
含有のFe合金からなる低膨脹側合金板を他面に
有する２枚重ねまたは３枚重ねのバイメタル板を
圧接して仕上げた後、 該バイメタル板のいずれか一方面に識別用エツ
チングマークを施し、さらに、 露点−60℃〜40℃のH2雰囲気中にて、 温度200℃〜500℃の焼付け応力除去処理を行な
い、 その後、スタンピング加工に続いて大気中時効
処理を行なうことを特徴とするバイメタルの製造
方法。[Claims] 1 Ni17.5wt% to 26wt%, Cr3.1wt% to 12wt%, Mn5wt% to 6wt%,
Has a high expansion side alloy plate made of Fe alloy containing one of Mo4wt% to 6wt% on one side, Ni35wt% to 50wt% or Cr13wt% to 18wt%
After pressing and finishing two or three stacked bimetal plates having a low-expansion side alloy plate made of a containing Fe alloy on the other side, an etching mark for identification is applied to one side of the bimetal plates, Furthermore, the bimetal is manufactured by performing a baking stress relief treatment at a temperature of 200°C to 500°C in an H2 atmosphere with a dew point of -60°C to 40°C, and then performing an aging treatment in the atmosphere following stamping. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1535786A JPS62173039A (en) | 1986-01-27 | 1986-01-27 | Manufacture of bimetal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1535786A JPS62173039A (en) | 1986-01-27 | 1986-01-27 | Manufacture of bimetal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62173039A JPS62173039A (en) | 1987-07-29 |
| JPH0253136B2 true JPH0253136B2 (en) | 1990-11-15 |
Family
ID=11886546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1535786A Granted JPS62173039A (en) | 1986-01-27 | 1986-01-27 | Manufacture of bimetal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62173039A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02303688A (en) * | 1989-05-17 | 1990-12-17 | Hitachi Cable Ltd | Manufacture of clad material having front and rear easily distinguishable |
| JPH0317594U (en) * | 1989-07-03 | 1991-02-21 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847288A (en) * | 1981-09-14 | 1983-03-18 | 株式会社東芝 | Manufacture of bimetal member |
-
1986
- 1986-01-27 JP JP1535786A patent/JPS62173039A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847288A (en) * | 1981-09-14 | 1983-03-18 | 株式会社東芝 | Manufacture of bimetal member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62173039A (en) | 1987-07-29 |
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