JP2565539B2 - A brazing sheet for structural members of a drone cup type heat exchanger with good brazing property - Google Patents
A brazing sheet for structural members of a drone cup type heat exchanger with good brazing propertyInfo
- Publication number
- JP2565539B2 JP2565539B2 JP63092400A JP9240088A JP2565539B2 JP 2565539 B2 JP2565539 B2 JP 2565539B2 JP 63092400 A JP63092400 A JP 63092400A JP 9240088 A JP9240088 A JP 9240088A JP 2565539 B2 JP2565539 B2 JP 2565539B2
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- heat exchanger
- type heat
- alloy
- cup type
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0233—Sheets, foils
- B23K35/0238—Sheets, foils layered
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、すぐれたろう付け性を有し、特にドロン
カツプ型熱交換器の構造部材である液体チユーブシート
材として用いるものに適したAl合金ブレージングシート
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has an excellent brazing property and is particularly suitable for use as an Al alloy brazing material used as a liquid tube sheet material which is a structural member of a drone cup type heat exchanger. It is about the seat.
近年、自動車などの輸送機器に、軽量化、コンパクト
化、および高性能化の要求から、ラジエータ、カークー
ラのコンデンサ、エバポレイタ、オイルクーラ、および
インタークーラなどの熱交換器としてドロンカツプ型の
ものが一部で積載されはじめている。In recent years, due to the demand for lighter weight, more compact size, and higher performance in transportation equipment such as automobiles, some heat exchangers such as radiators, car cooler condensers, evaporators, oil coolers, and intercoolers are of the drone cup type. Is being loaded in.
このドロンカツプ型熱交換器は、構造部材である半割
りの液体チユーブシート材を合わせて１対としたもの
と、同じくフイン材とを１層づつ、あるいは２層以上交
互に積み重ね、この積み重ね体を治具で固定した状態で
フラツクスをう付けあるいは真空をろう付けをすること
により製造されている。This Droncup type heat exchanger is composed of a pair of half-divided liquid tube sheet materials, which are structural members, and a pair of fin materials, one layer at a time, or two or more layers alternately stacked. It is manufactured by brazing a flux or brazing a vacuum while being fixed with a jig.
また、上記の液体チユーブシート材は、JIS3003や695
1、さらに3005などのAl合金からなる芯材の片面あるい
は両面に、同4045や4004などのAl合金からなるろう材を
クラツドしてなるAl合金ブレージングシートからプレス
加工により形成されたものである。In addition, the above liquid tube sheet materials are JIS3003 and 695
1. Further, it is formed by pressing an Al alloy brazing sheet obtained by cladding a brazing material made of Al alloy such as 4045 or 4004 on one or both sides of a core material made of Al alloy such as 3005.
しかし、上記ドロンカツプ型熱交換器においては、こ
れを流れる液体に比較的大きな圧力が負荷されるので、
特に液体チユーブシート材の合せ目はをう付けが完全で
あることが要求されるが、上記の従来ブレージングシー
トで構成されている流体チユーブシート材では、特に、
真空ろう付け炉内の真空が十分に高くなつていない場合
や、不活性雰囲気ろう付け炉内の雰囲気ガスの露点が十
分に低くなつていない場合、さらにろう付けの前のプレ
ス加工で付着した油などの洗浄が十分でない場合などの
拙劣な条件下でのろう付けに際して、合せ面（ろう付け
継手）の内側のフイレット形成が良好でなく、ろう付け
後の耐圧試験で不合格となる場合があり、多い場合には
30％にも及ぶ不良が発生し、この不合格品は手直しを行
なうことができないので、ロツト単位で処分されること
もあり、製造歩留の低いものである。However, in the above Dron cup heat exchanger, since a relatively large pressure is applied to the liquid flowing through it,
In particular, the seam of the liquid tube sheet material is required to be completely filled, but in the fluid tube sheet material composed of the above conventional brazing sheet, in particular,
If the vacuum in the vacuum brazing furnace is not sufficiently high, or if the dew point of the atmosphere gas in the inert atmosphere brazing furnace is not sufficiently low, the oil adhered by pressing before brazing is also used. When brazing under poor conditions such as when cleaning is not sufficient, etc., the fillet formation inside the mating surface (brazing joint) may not be good and the pressure test after brazing may fail. , If many
Since a defect of up to 30% occurs, and this rejected product cannot be reworked, it may be disposed of in lot units, resulting in a low manufacturing yield.
そこで、本発明者等は、上述のような観点から、特に
ドロンカツプ型熱交換器の製造に際して、これの構造部
材、特に液体チユーブシート材として用いた場合に、ろ
う付け条件に影響を受けることなく、良好なろう付け性
を示すブレージングシートを開発すべく研究を行つた結
果、 従来のブレージングシートを構成するろう材の表面粗
さは、圧延方向に直角の方向で、 平均粗さ（Ra）:0.4〜0.6μｍ、 最大粗さ（Rmax）:3〜４μｍ、 であり、その表面に存在する多数の微小亀裂には25〜40
μｍの長さのものが1mm2当り約20個以上存在するが、ブ
レージングシートの製造に際して、冷間圧延における１
回の圧延率をできるだけ小さくする。すなわち圧延回数
を多くすると、長い微小亀裂がなくなるようになり、し
たがつてこの１回の圧延率（圧延回数）を制御して、20
μｍを越えて長い微小亀裂が存在しないようにすると共
に、ブレージングシートの冷間圧延工程における少なく
とも最終冷間圧延を表面がブライト仕上げ、あるいは鏡
面仕上げされた圧延ロールを用いて行ない、その表面粗
さを、圧延方向に直角の方向で、 平均粗さ（Ra）:0.4μｍ以下、 最大粗さ（Rmax）:2.5μｍ以下、 とすると、この状態のブレージングシートから成形され
た液体チユーブシート材においては、ろう付け条件に影
響されることなく、すなわち上記の拙劣なろう付け条件
であつても、すぐれたろう付け性を示し、ろう付け継手
（合せ面）の内側には良好なフイレツドが形成されるよ
うになつて、耐圧試験に十分合格するドロンカツプ型熱
交換器を歩留よく製造することができるという知見を得
たのである。Therefore, the inventors of the present invention, from the above viewpoints, are not affected by brazing conditions, particularly when used as a structural member of the Dron cup heat exchanger, particularly when used as a liquid tube sheet material. , As a result of conducting research to develop a brazing sheet exhibiting good brazing property, the surface roughness of the brazing material constituting the conventional brazing sheet is the average roughness (Ra) in the direction perpendicular to the rolling direction: 0.4 to 0.6 μm, maximum roughness (Rmax): 3 to 4 μm, and 25 to 40 for many microcracks existing on the surface.
There are about 20 or more μm lengths per 1 mm 2, but when manufacturing brazing sheets, 1
Minimize the rolling rate of rolling. That is, when the number of rollings is increased, long microcracks are eliminated, so that the rolling rate (rolling number) of this one time is controlled to 20
In addition to preventing the presence of microcracks longer than μm, at least the final cold rolling in the cold rolling process of the brazing sheet is performed by using a rolling roll having a surface with a bright finish or a mirror finish, and its surface roughness. When the average roughness (Ra) is 0.4 μm or less and the maximum roughness (Rmax) is 2.5 μm or less in the direction perpendicular to the rolling direction, in the liquid tube sheet material formed from the brazing sheet in this state, , Regardless of the brazing conditions, that is, even under the above-mentioned poor brazing conditions, it shows excellent brazing properties, and a good fillet is formed inside the brazing joint (mating surface). Then, they have found that it is possible to manufacture a Dron cup type heat exchanger that passes the pressure resistance test with good yield.
この発明は、上記知見にもとづいてなされたものであ
つて、 Al合金芯材の片面または両面にAl合金ろう材をクラツ
ドしてなるブレージングシートにおいて、 上記Al合金ろう材の少なくとも片面の表面粗さを、圧
延方向に直角の方向で、 平均粗さ（Ra）:0.4μｍ以下、 最大粗さ（Rmax）:2.5μｍ以下、 とすると共に、その表面に存在する微小亀裂の長さを、
20μｍ以下とすることにより、ブレージングシートのろ
う付け性を改善し、ドロンカツプ型熱交換器の構造部
材、特に液体チユーブシート材としての使用に適合せし
めたブレージングシートに特徴を有するものである。The present invention has been made based on the above findings, in a brazing sheet formed by cladding an Al alloy brazing material on one or both sides of an Al alloy core material, wherein the surface roughness of at least one surface of the Al alloy brazing material is In the direction perpendicular to the rolling direction, the average roughness (Ra): 0.4 μm or less, the maximum roughness (Rmax): 2.5 μm or less, and the length of the microcracks existing on the surface is
When the thickness is 20 μm or less, the brazing property of the brazing sheet is improved, and the brazing sheet is characterized by being suitable for use as a structural member of a drone cup heat exchanger, particularly as a liquid tube sheet material.
したがつて、上記の従来ブレージングシートのよう
に、ろう材の表面粗さが、圧延方向に直角の方向で、Ra
で0.4μｍを越え、かつRmaxで2.5μｍを越えると共に、
ろう材表面に存在する微小亀裂に20μｍを越える長さの
ものがあると、良好なろう付けを確保することができな
い。Therefore, like the conventional brazing sheet above, the surface roughness of the brazing material is Ra in the direction perpendicular to the rolling direction.
Exceeds 0.4 μm and Rmax exceeds 2.5 μm,
If the microcracks existing on the surface of the brazing material have a length exceeding 20 μm, good brazing cannot be secured.
つぎに、この発明のブレージングシートを実施例によ
り具体的に説明する。Next, the brazing sheet of the present invention will be specifically described with reference to Examples.
通常の溶解法にて、芯材用Al合金として、3003合金
（組成:Al−1.23％Mn−0.12％Cu）、3005合金（組成:Al
−1.31％Mn−0.36％Mg）、および6951合金（組成:Al−
0.62％Mg−0.38％Si−0.22％Cu、以上重量％、以下％は
重量％を示す）をそれぞれ溶製し、またろう材用Al合金
として、4004合金（組成:Al−9.36％Si−1.33％Mg）お
よび4045合金（組成:Al−10.2％Si）を溶製し、竪型半
連続鋳造装置を用いて厚さ:414mmの鋳塊とした後、3003
および3005合金鋳造には温度:590℃に12時間保持、6951
合金鋳造には560℃に12時間保持、そしてろう材用Al合
金鋳塊には480℃に12時間保持の条件でそれぞれ均質化
処理を施し、ついでこれらの鋳塊の両面に片側7mmづつ
の厚さで面削を施し、かつろう材用Al合金鋳塊には熱間
圧延を施して、その厚さを50mmとし、この状態で、前記
芯材用Al合金鋳塊の両面に、それぞれ第１表に示される
組合せにおいて前記ろう材用Al合金熱延板を重ね合わせ
て合計500mmの厚さとし、これを480℃の圧延開始温度で
熱間圧延して、その厚さが7mmのクラツド材とし、引続
いて、このクラツド材に、厚さが、5mm→3.8mm→2.9mm
→2.2mm→1.7mm→1.3mm→1.0mmと変化する７段（従来は
下記の通り５段）の冷間圧延を施して、ろう材の表面に
大きな微小亀裂が形成されるのを抑制した圧延を行な
い、この冷間圧延において、厚さ:5mmの時点で、不活性
ガス雰囲気中、温度:350℃に２時間保持の条件で中間焼
鈍を施し、また厚さ:1.3mmおよび1.0mmの冷間圧延を、
ロール表面をブライト仕上げあるいは鏡面仕上げして、
その表面粗さを調整した各種の圧延ロールを用いて行な
い、最終的に不活性ガス雰囲気中、温度:350℃に２時間
保持の条件で焼鈍を施すことによつて、第１表に示され
る表面粗さ並びに微小亀裂の最大長を有する本発明のブ
レージングシート１〜２をそれぞれ製造した。3003 alloy (composition: Al-1.23% Mn-0.12% Cu), 3005 alloy (composition: Al
-1.31% Mn-0.36% Mg), and 6951 alloy (composition: Al-
0.62% Mg-0.38% Si-0.22% Cu, above weight%, below% indicates weight%), respectively, and as an Al alloy for brazing material, 4004 alloy (composition: Al-9.36% Si-1.33) % Mg) and 4045 alloy (composition: Al-10.2% Si) were melted and made into a slab with a thickness of 414 mm using a vertical semi-continuous casting machine, then 3003
And for casting 3005 alloy, temperature: held at 590 ℃ for 12 hours, 6951
The alloy casting is homogenized at 560 ℃ for 12 hours, and the brazing aluminum alloy ingot at 480 ℃ for 12 hours. Then, both sides of these ingots have a thickness of 7 mm on each side. And the aluminum alloy ingot for brazing material is hot-rolled to a thickness of 50 mm. In the combination shown in the table, the brazing material Al alloy hot rolled sheets are laminated to a total thickness of 500 mm, which is hot-rolled at a rolling start temperature of 480 ° C. to obtain a clad material having a thickness of 7 mm, Then, the thickness of this cladding material is 5mm → 3.8mm → 2.9mm
->2.2mm->1.7mm->1.3mm-> 1.0mm 7-step cold rolling (previously 5 steps as below) was applied to suppress the formation of large microcracks on the surface of the brazing material. Rolling was performed, and in this cold rolling, at a thickness of 5 mm, an intermediate annealing was performed in an inert gas atmosphere at a temperature of 350 ° C. for 2 hours, and thicknesses of 1.3 mm and 1.0 mm were applied. Cold rolling,
Bright or mirror finish the roll surface,
The results are shown in Table 1 by using various rolling rolls whose surface roughness is adjusted and finally annealing in an inert gas atmosphere at a temperature of 350 ° C. for 2 hours. Brazing sheets 1 and 2 of the present invention having surface roughness and maximum length of microcracks were produced, respectively.
また、比較の目的で、上記冷間圧延を、その厚 さが、5mm→3.2mm→2.1mm→1.4mm→1.0mmに変化する５
段で行なうと共に、この５段冷間圧延のいずれも通常の
圧延ロール、すなわち表面をミル仕上げした各種の圧延
ロールを用いて行なう以外は、同一の条件で同じく第１
表に示される表面粗さ並びに微小亀裂の最大長を有する
従来ブレージングシート１〜４をそれぞれ製造した。な
お、第１表における表面粗さおよび表面微小亀裂の最大
長の値は、ブレージングシートの適宜10ヶ所を測定し、
このうちの最高値をもつで示した。For comparison purposes, the cold rolling was Changes from 5mm → 3.2mm → 2.1mm → 1.4mm → 1.0mm 5
In the same conditions, except that the five-stage cold rolling is performed using normal rolling rolls, that is, various rolling rolls whose surfaces are mill-finished.
Conventional brazing sheets 1 to 4 each having the surface roughness and the maximum length of microcracks shown in the table were manufactured. In addition, the values of the surface roughness and the maximum length of the surface microcracks in Table 1 are measured at 10 points on the brazing sheet,
The highest value among them is shown.
ついで、この結果得られた各種のブレージングシート
から、第１図に概略縦断面図で示されるように、ドロン
カツプ型熱交換器の流体チルーブシート材をモデフアイ
した、内径:40mmφ×深さ:8mmにして、かつ底部中央部
に直径:10mmφの中心孔のあるものと、これのないカツ
プ状試験片をプレス成形し、これを２枚１組にして３組
積み重ね、この状態で、不活性ガス雰囲気中、温度:600
℃に５分間保持の条件でのフラツクスろう付け、または
１×10-4torrの真空中、温度:600℃に３分間保持の条件
での真空ろう付けを行ない、ドロンカツプ型熱交換器に
モデフアイした構造のろう付け積層体を製造し、引続い
てこのろう付け積層体の底部中心孔に接続用パイプをト
ーチろう付けにより取付け、このパイプを耐圧試験機に
接続し、水圧を用いて耐圧試験を行ない、前記試験片の
ろう付け合せ面に剥離が発生した時点の最高圧力を測定
した。これらの結果を第１表に示した。Then, from the various brazing sheets obtained as a result, as shown in the schematic longitudinal sectional view in FIG. 1, the fluid chile sheet material of the drone cup heat exchanger was modified, and the inner diameter was 40 mmφ and the depth was 8 mm. In addition, one with a central hole with a diameter of 10 mmφ in the center of the bottom and a cup-shaped test piece without it were press-molded, and two sets of these were stacked one by one, and three sets were stacked in this state in an inert gas atmosphere , Temperature: 600
Frax brazing under conditions of holding at 5 ° C for 5 minutes or vacuum brazing under conditions of 1 x 10 -4 torr at a temperature of 600 ° C for 3 minutes was carried out, and the Dron cup heat exchanger was modeled. A brazed laminate having a structure is manufactured, and then a connecting pipe is attached to the bottom center hole of the brazed laminate by torch brazing, the pipe is connected to a pressure tester, and a pressure test is performed using water pressure. The maximum pressure was measured when peeling occurred on the brazed surface of the test piece. The results are shown in Table 1.
第１表に示される結果から、本発明ブレージングシー
ト１〜12で製造されたろう付け積層体は、いずれも高い
耐圧強度を示し、ろう付け合せ面（ろう付け継手）のろ
うけが良好で、その内側には良好なフイレツトが形成さ
れているのに対して、従来ブレージングシート１〜４で
製造されたろう付け積層体においては、ろう付け継手の
強度が低く、比較的低い内圧にしか耐えることができ
ず、ろう付けが完全でないことが明らかである。From the results shown in Table 1, all of the brazing laminates produced by the brazing sheets 1 to 12 of the present invention show high pressure resistance, good brazing of the brazing mating surface (brazing joint), and Has a good fillet, whereas in the brazing laminates conventionally produced with brazing sheets 1 to 4, the strength of the brazing joint is low and it can withstand only a relatively low internal pressure. Obviously the brazing is not perfect.
上述のように、この発明のブレージングシートは、す
ぐれたろう付け性を有し、特に高いろう付け強度が要求
されるドロンカツプ型熱交換器の流体チユーブシート材
として用いた場合に、これのろう付け不漁が原因の不良
品の発生が激減し、製品歩留が著しく向上するようにな
るなど工業上有用な効果をもたらすものである。As described above, the brazing sheet of the present invention has excellent brazing properties, and when it is used as a fluid tube sheet material for a drone cup type heat exchanger that requires particularly high brazing strength, it does not braze. The number of defective products caused by is drastically reduced, and the product yield is remarkably improved, resulting in an industrially useful effect.
第１図はドロンカツプ型熱交換器をモデフアイした構造
のろう付け積層体を示す概略縦断面図である。FIG. 1 is a schematic vertical sectional view showing a brazing laminated body having a structure in which a Delon cup type heat exchanger is modified.
Claims (1)
材をクラツドしてなるブレージングシートにおいて、 上記Al合金ろう材の少なくとも片面の表面粗さを、圧延
方向に直角の方向で、 平均粗さ（Ra）:0.4μｍ以下、 最大粗さ（Rmax）:2.5μｍ以下、 とすると共に、その表面に存在する微小亀裂の流さを、
20μｍ以下としたことを特徴とするろう付け性の良好な
ドロンカツプ型熱交換器の構造部材用ブレージングシー
ト。1. A brazing sheet obtained by cladding an Al alloy brazing material on one or both sides of an Al alloy brazing material, wherein the surface roughness of at least one surface of the Al alloy brazing material is averaged in a direction perpendicular to the rolling direction. Roughness (Ra): 0.4 μm or less, maximum roughness (Rmax): 2.5 μm or less, and the flow rate of microcracks existing on the surface is
A brazing sheet for a structural member of a drone cup type heat exchanger having good brazability, which has a thickness of 20 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63092400A JP2565539B2 (en) | 1988-04-14 | 1988-04-14 | A brazing sheet for structural members of a drone cup type heat exchanger with good brazing property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63092400A JP2565539B2 (en) | 1988-04-14 | 1988-04-14 | A brazing sheet for structural members of a drone cup type heat exchanger with good brazing property |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01262091A JPH01262091A (en) | 1989-10-18 |
| JP2565539B2 true JP2565539B2 (en) | 1996-12-18 |
Family
ID=14053367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63092400A Expired - Fee Related JP2565539B2 (en) | 1988-04-14 | 1988-04-14 | A brazing sheet for structural members of a drone cup type heat exchanger with good brazing property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2565539B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1992441B8 (en) | 2005-12-09 | 2012-12-26 | Kabushiki Kaisha Kobe Seiko Sho | Method of manufacturing a clad material |
| JP5704678B2 (en) * | 2010-01-07 | 2015-04-22 | 株式会社Uacj | Aluminum alloy flat tube for heat exchanger and aluminum alloy heat exchanger |
| JP5680857B2 (en) * | 2010-01-07 | 2015-03-04 | 株式会社Uacj | Aluminum alloy flat tube for heat exchanger and aluminum alloy heat exchanger |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6179752A (en) * | 1984-09-27 | 1986-04-23 | Mitsubishi Alum Co Ltd | Manufacture of vacuum brazing sheet for drawn cup material in drawn cup type heat exchanger |
-
1988
- 1988-04-14 JP JP63092400A patent/JP2565539B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6179752A (en) * | 1984-09-27 | 1986-04-23 | Mitsubishi Alum Co Ltd | Manufacture of vacuum brazing sheet for drawn cup material in drawn cup type heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01262091A (en) | 1989-10-18 |
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