JPS5960193A - Heat exchanging element plate and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent a pressure-rolled plate from distortion, and a pressure rolled surface from breakage, by pinching a fluid passageway tube made of copper material by a fin part made of aluminum material, and by expanding the tube after it is cold-rolled into a flat form under the same rolling rate. CONSTITUTION:The upper surface of an aluminum plate 1, the outer surface of a steel tube 2' and the under surface of an aluminum plate 3 are respectively roughed by a brush 14, and at the same time, deposited foreign matters are removed from them. A releasant is previously put on the inside surface of a copper tube 2' to prevent the inner surface from being pressure-rolled to each other. A groove 17 is formed in the position of a cold pressure roller 16 corresponding to the pathway of a steel tube 2' or a flat steel tube 2, and a pressure- rolled plate 18 is rolled up at one passing of it under the uniform rolling rate as a whole. The pressure-rolled plate 18, made in the above-mentioned manner, is cut into a purposed size, and is pinched between pressure plates 19. The tip of a nozzle 20 is inserted into the detached end part of a flat copper tube 2, from which the fluid pressure such as air or water is introduced into the tube 2 to expand it to form a fluid passage-way tube.

Description

【発明の詳細な説明】 本発明は太陽熱温水器、苗内暖房用パネルラジＴ−ター
等に使用されるパネル状熱交換器の熱交換素板Ｊ３よび
その製造法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange blank J3 for a panel heat exchanger used in solar water heaters, panel radiators for heating seedlings, etc., and a method for manufacturing the same.

従来、ロールボンド法によるアルミニウム製熱交換素板
は多くの熱交換器に使用されているが、例えば熱交換媒
体としＣ水を用いる熱交換器には、アルミニウムの腐食
の問題があり、使用でき４１かった。Conventionally, aluminum heat exchange blank plates made by the roll bonding method have been used in many heat exchangers, but for example, heat exchangers that use C water as the heat exchange medium have problems with corrosion of the aluminum and cannot be used. It was 41.

腐食の問題を解決りるには熱交換器の流体通路を銅系月
利でつくることが望ましいが、素板金体を銅系月利でつ
くると価格的にも又、重市点にも問題があった。To solve the problem of corrosion, it is desirable to make the fluid passages of the heat exchanger with copper-based metal, but if the blank metal body is made with copper-based metal, there will be problems in terms of price and heavy market. was there.

本発明はこのＪ、うな従来の欠点をなくすため、流体通
路には銅系月利を、その他の熱交換フィン部にはアルミ
ニウム系月利を用い、これらを一体面に汀着覆ることに
よって熱交換素板を提供りるちのである。In order to eliminate this conventional drawback, the present invention uses a copper-based material for the fluid passage and an aluminum-based material for the other heat exchange fins, and covers them in one piece to heat up the heat. Riruchino provides replacement plates.

かかる［１的を達成り−るために、従〉１ξ、例えば特
公昭５５−１８！ｉ２号公報にみられるように下記の如
き技ｉ＋ｊｉが知られＣいる。In order to achieve this goal, for example, the Special Publication Act 1986-18! As seen in the i2 publication, the following technique i+ji is known.

すなわら、該技術には第１図に示づ如く、アルミニウム
板１の」ニに所定の間隔を置いて圧潰扁平化した扁平銅
管２を載置し、その」−からアルミニウム板３を挟着し
、熱間および冷間圧延を施し、２枚のアルミニウム板１
．３をその相対面に８３いて圧着し、第２図に示ｔ　、
Ｊ、うな扁平銅管２を内包する圧着板４を１ｑるもので
ある。In other words, in this technique, as shown in FIG. 1, flat copper tubes 2 which have been crushed and flattened are placed on the aluminum plate 1 at a predetermined interval, and an aluminum plate 3 is inserted from the aluminum plate 1 at a predetermined interval. Sandwiched and subjected to hot and cold rolling, two aluminum plates 1
．． 3 on its opposite surface and crimped as shown in FIG. 2.
J, 1q is a crimp plate 4 containing an elongated flat copper tube 2.

この場合、銅とアルミニウムの変形抵抗のｊｕいを考慮
して、扁平銅管２とアルミニウム板１゜３とを予めリベ
ツ１−あるいは溶接等にＪ、り一体的に強固に結合固定
しておく。そして、扁平鋼管２は熱間圧延時に高温酸化
して管内面が圧着づることなく、離型剤や圧着防止剤を
用いなくでも膨管１−ることができるものである。In this case, taking into consideration the high deformation resistance of copper and aluminum, the flat copper tube 2 and the aluminum plate 1゜3 are firmly connected and fixed in advance by rivets or welding. . The flat steel tube 2 can be made into an expanded tube without using a mold release agent or an anti-crimping agent, without causing the inner surface of the tube to be compressed due to high-temperature oxidation during hot rolling.

かかる従来技術において、扁平銅管２とアルミニウム板
１．３とを重ね−（−圧下すると、アルミニウム板部分
の圧下率は Ｔへ−ｔＡ　　　　ｔへ チー−＝　１−− Ｔ　Ａ　　　　　　ＴＡ　　　　・・・・・・（１）但
し、ＴＡ　＝　１”Ａ　＋　−１−’ＴΔ２　（第１図
参照）また、扁平鋼管部分の圧下率は １−’Ａ＋−１−Ｃ−ｔ　Ａ　　　　　　ｔ　Ａ−１−
□ １”　Ａ　＋　Ｔ　ＣＴΔト１−Ｃ ・・・・・・（２） となり、（２＋　＞　（１１となる。すなわち、第１図
の状態１）＋　＋ら第２図の状態に圧着りると、扁平鋼
管介在部とそうでない部分とでは圧下率に差ができて、
各断面部分で伸び率の差を生じ、第３図に示ずＪ：うに
、圧延ロール５の手前側では扁平鋼管介在部に材料のタ
マリ部６が生じ、最終的には圧延不能となるか、そうで
なくても歩留りが非常に悪くなる。このことは、アルミ
ニウム板と扁平鋼管とを強固に固定しておいても、上記
の如き根本的な圧下率の違いは、前述の［タマリ、１の
問題を発生する。In this conventional technique, when the flat copper tube 2 and the aluminum plate 1.3 are stacked and rolled down, the rolling reduction rate of the aluminum plate portion is T -tA tHechi = 1-- T A TA . ...(1) However, TA = 1"A + -1-'TΔ2 (see Figure 1) Also, the rolling reduction ratio of the flat steel pipe section is 1-'A+-1-C-t A t A-1-
□ 1" A + T CTΔto1-C (2) (2+ > (11). In other words, the state 1 in Fig. 1) + is crimped to the state in Fig. 2. As a result, there is a difference in the reduction rate between the interposed part of the flat steel pipe and the part without it,
Differences in elongation occur at each cross-sectional portion, and as shown in Fig. 3, a bulging portion 6 of the material occurs at the flat steel pipe intervening portion on the front side of the rolling roll 5, eventually making it impossible to roll. , otherwise the yield will be very poor. This means that even if the aluminum plate and the flat steel pipe are firmly fixed, the fundamental difference in rolling reduction ratio as described above will cause the problem 1 mentioned above.

さらに熱間および冷間圧延を施りど、熱間）Ｆ延のどき
銅とアルミニウムどの圧着界面部は０ｊ１−△ρ金属間
化合物を生じ、（＾めで砕り易く、銅とアルミニウムの
膨張率の差が影響）シて、Ｉ［着面破壊という問題を内
蔵している。Furthermore, when hot and cold rolling is applied, the crimped interface between copper and aluminum during hot rolling produces 0j1-△ρ intermetallic compounds, which are easily crushed due to the expansion coefficient of copper and aluminum. The problem is that the contact surface is damaged due to the difference in

また、圧着板の各部分に圧下率の差を右Ｊるということ
は、極端に内部応力を右りることどなり、熱交換器どし
て高温側で使用づる場合に、この応力が解放されるど、
汀看板が大きく歪むため商品となし得ない欠点もある。In addition, applying different rolling reduction rates to each part of the crimp plate causes an extreme increase in internal stress, and when used in a heat exchanger at high temperatures, this stress is released. Rudo,
There is also a drawback that the shore signboard is severely distorted and cannot be used as a commercial product.

本発明は、以上の従来の欠点を解消したもので、その第
１ずれ明は、銅系材料よりなる流体通路管がアルミニウ
ム系４４石よりなるフィン部によって挟着されてなり、
該流体通路管部（まフィン部ど同−圧下率にＪ、っ−Ｃ
冷間にて扁平状に１［下されたのち、膨管されたもので
あることを特徴とづる熱交換素板を要旨どする。The present invention solves the above-mentioned conventional drawbacks, and the first advantage is that a fluid passage tube made of a copper-based material is sandwiched between fin parts made of aluminum-based 44 stones.
The fluid passage pipe part (the same as the muffin part - the reduction rate is J, -C
Abstract: A heat exchange blank plate is characterized in that it is flattened in the cold and then expanded into tubes.

第４図（よその−例を示づ斜視図で、銅系材料Ｊ、りな
る流体通路管７がアルミニラ１＼系＋Ａ　Ｆよりなるフ
ィン部８内に挟着されて、１３す、該流体通路管７はフ
ィン部Ｅ３ど同−肚手率によって冷間にて扁平状に圧下
させたのち膨管されたもので、その境弄部のフィン部８
には同−圧下率で汁着けしめられたために段部９が形成
されでいる。す４Ｔわち、住盾覆る２枚のアルミニウｌ
＼板を同一厚さのものを用い〕、：場合には、流体通路
管７に接りるアルミニウム系月利部分の厚さはフィン部
８の半分どなる。これにＪ、す、流体通路管７内に流イ
ホＬ［〈内圧）が人きくＩＵｌいた場合、膨管端部９″
部分に引張ノｊ以外に曲げ応力が人さく作用覆るが、こ
のような薄板の場合（よ段部９がこれを軽減させる補強
効果がある。またフィン部８からの熱伝導率もこの段部
９で流体通路管゛７にλ１して熱の均等分散伝導が可能
となる。FIG. 4 (a perspective view showing another example) shows that a fluid passage tube 7 made of a copper-based material J is sandwiched within a fin portion 8 made of an aluminum 1\ system + A F, The passage pipe 7 is formed by rolling down the fin portion E3 into a flat shape in cold conditions and then expanding it, and the fin portion 8 at the boundary between the fin portions E3
A stepped portion 9 is formed because the material is soaked with liquid at the same rolling reduction rate. 4T, two pieces of aluminum covering the shield
If the plates are of the same thickness, the thickness of the aluminum part in contact with the fluid passage pipe 7 will be half the thickness of the fin part 8. In addition, if there is a flow L [<internal pressure] in the fluid passage tube 7, the expansion tube end 9''
In addition to the tensile stress, bending stress acts on the part, but in the case of such a thin plate (the stepped part 9 has a reinforcing effect to reduce this stress. Also, the thermal conductivity from the fin part 8 is also At 9, heat can be evenly distributed and conducted by λ1 to the fluid passage pipe 7.

流体通路管７の銅系材料は、例えばＪＩＳｌ−１３３０
０，Ｃｌ２２０などの銅おにび銅合金よりなり、又、フ
ィン部８のアルミニウムは例えばＪＩＳｌ−１４０００
，Ａ１１００．Ａ３００３などのアルミニウムおＪ、σ
アルミニウム合金Ｊ：りなる。The copper material of the fluid passage pipe 7 is, for example, JIS I-1330.
The aluminum of the fin portion 8 is made of JIS I-14000, for example.
, A1100. Aluminum J, σ such as A3003
Aluminum alloy J: Rinaru.

かかる熱交換素板は、これを多数並置して熱間換器が使
用する場合に、その成形加」二に何等無理がないため強
固に圧着されており、圧着部が破壊りるようなことがな
い。又、内部応力の不拘−心なく、歪みが生じるような
ことらない。When such heat exchange blank plates are used in a heat exchanger by placing a large number of them side by side, they are firmly crimped together because there is no force in the forming process, and there is no possibility that the crimped parts will break. There is no. Moreover, there is no restriction of internal stress and no distortion occurs.

したがって、熱交換器に組込む際には正（イ「に相合け
ることができる。Therefore, when incorporated into a heat exchanger, it can be compatible with positive (A).

第２発明は、内面に剥離剤を塗布した銅系月料管を２枚
のアルミニウム系材料ス１−リップにイれぞれの対向面
を粗面化して挾み、これらを溝イ（］きロールを用いて
、そのロールの溝部分が扁平どなった銅系月利管部分に
位置りるようにしで、連続的に各部同一圧下率の十に冷
間圧延してｆＸ　ｕけしめ圧延プレートどなし、ついで
該圧延プレーミル内に配置された扁平銅系材料管の剥Ｈ
１剤によって圧着され−Ｃいない内面に加圧流体を導入
して該扁平銅系材料管を膨管させ流体通路を形成づるこ
とを特徴どする熱交換素板の製造法を要旨どする。　こ
れを図面によって説明Ｊるど、第５図は一実施例の説明
図ｒ、１０はｊ′ルミニウム板１を巻イ」りであるアル
ミニウムシートロイル、１１は銅管２′を巻付ＧＪ　’
Ｕある銅管コイル、］２はアルミニウム板３を巻付ＩＪ
　’Ｕあるアルミニウムシー１へ］イルＣある−０これ
らの王者からそれぞれ素材を引き出し、冷間ル接目−ル
１６．′１６で圧着し、圧着板を巻取二１イル１３に巻
取るものであるが、圧着に先立って、アルミニウム板１
の−Ｌ面、鋼管２″の外表面、アルミニウム板３の下面
をぞれぞれブラシ１４をもって粗面化し、同Ｉ１．′Ｊ
に表面の酸化１１９での他町着異物を除去する。又、鋼
管２′は必要に応じ加圧ＩＮ−ル１５をもつ−Ｃ扁平鋼
管２どしτから圧着し−（”ｂよい。この鋼管２′は内
面に予め剥自１１剤を介在せしめでおき、内面同士が圧
着されないにうにηる。In the second invention, a copper-based monthly charge pipe coated with a release agent on the inner surface is sandwiched between two aluminum-based material slips with their opposing surfaces roughened, and these are placed in a groove. Using a roll, the groove part of the roll is positioned on the flattened copper-based monthly profit pipe part, and each part is continuously cold-rolled to the same rolling reduction rate. Peeling of the plate and then the flat copper-based material tube placed in the rolling play mill.
This article summarizes a method for manufacturing a heat exchange blank plate, which is characterized by introducing a pressurized fluid into the inner surface of the flat copper material tube, which is compressed by a single agent and which is not -C, to expand the flat copper material tube and form a fluid passage. This will be explained using drawings. Fig. 5 is an explanatory diagram of one embodiment, 10 is an aluminum sheet roll around which the aluminum plate 1 is wound, and 11 is an aluminum sheet roll around which the copper tube 2' is wound.
A copper tube coil,] 2 is wrapped around an aluminum plate 3.
'To a certain aluminum sheet 1] Il C aru-0 Pull out the materials from each of these kings, and cold-apply them.16. 16, and the crimped plate is wound up on the winding coil 13. Prior to crimping, the aluminum plate 1 is
The -L surface of the steel pipe 2'', the outer surface of the steel pipe 2'', and the lower surface of the aluminum plate 3 are each roughened with a brush 14, and
Then, foreign matter deposited on the surface due to oxidation 119 is removed. Further, the steel pipe 2' is crimped from the C flat steel pipe 2 with a pressurizing IN-rule 15 as required. Make sure that the inner surfaces are not crimped together.

冷間圧接［」−ル１６には第６図に示りょうに銅管２　
あるいは扁平銅管２の通過対応位置に満１７を形成しで
ある。As shown in FIG.
Alternatively, a hole 17 may be formed at a position corresponding to the passage of the flat copper tube 2.

第５図のＡ−Ａ断面では、各素材は第７図あるいは第８
図に示１如き配直どなつ′Ｃおり、又、Ｂ　−＋３断面
では第９図に示づ如く、鋼管圧着部は厚く、その（［ｊ
（の／Ｉ着部は薄くなっている。In the A-A cross section of Fig. 5, each material is shown in Fig. 7 or 8.
As shown in Figure 1, there is no wiring alignment, and in the B-+3 cross section, as shown in Figure 9, the steel pipe crimping part is thick and its ([j
(The /I part is thinner.

このようにして、各アルミニ【シム板１．３と扁平ｆＦ
Ｊ管２どを冷間圧接ロール１Ｇにより１パスで例えば７
０％の圧下率をもって、しかし全体的に圧下率を均等に
した状態でＬ［着板１８を巻取る。In this way, each aluminum [shim plate 1.3 and flat fF
J pipe 2 etc. is rolled in one pass by cold pressure welding roll 1G, for example 7
Roll up the L [attached plate 18] with a rolling reduction rate of 0%, but with the rolling reduction rate being uniform throughout.

こうしてつくった圧着板１Ｂは適当用法に切断し、第１
０図に示Ｊように、第１１図の如ぎ△−Ａｌｉｉ面を右
−りる押え型１９に挟着し、ノズル２０の先端を扁平銅
管２端部の離間部に挿入して、空気、水等の流体圧を導
入し、扁平銅管２を拡開して流体通路管を形成する。The crimp plate 1B thus produced is cut into an appropriate shape, and the first
As shown in FIG. 0, the △-Alii surface as shown in FIG. Fluid pressure such as air or water is introduced to expand the flat copper tube 2 to form a fluid passage tube.

このにう４丁製法によれば、まり゛各素祠の１１着面が
粗面化によって酸化物イの他の異物が除去されているの
で、冷間にお（プる１パス圧着が可１ｉｕである。又、
冷間圧接ロールには溝が形成しＣあるので、圧着板全体
の圧下率が均等どなり、かつ圧着板の内部応力がＶＲｔ
ｌｉされても歪みの発生の′１．にい製品が１１〕られ
る。しかも、鋼管は’（ｉｌｌｌに自然と誘導されるの
で、その位置決めのための手段を全く必要としない。According to this 4-piece manufacturing method, the 11 bonding surfaces of each grain are roughened to remove oxides and other foreign substances, so cold one-pass crimping is possible. It is 1iu.Also,
Since the cold pressure welding roll has a groove formed therein, the rolling reduction rate of the entire pressure bonding plate is uniform and the internal stress of the pressure bonding plate is VRt.
'1. Distortion occurs even if it is li. 11] products are produced. Moreover, since the steel pipe is naturally guided to the position, there is no need for any means for positioning it.

冷間１パス圧着のため、銅系月利とアルミニウム系）、
Ａ　ｉｌどの圧着部での金属間化合物の成長はなく、圧
着面破壊の心配は全くない。Due to cold one-pass crimping, copper-based monthly rate and aluminum-based),
There is no growth of intermetallic compounds at the crimped parts, and there is no fear of damage to the crimped surfaces.

４Ｔお、」ニ記例（・は同じ大きざのアルミニウム板を
正対面さけているが、第１２（ａ）図に承り如くノアル
ミニウム板１，３を左右にずらけ−で対向させ、その対
向端面において扁平鋼管２″と圧６しＣもよい。：した
、第１２（＋１）図の如く上干ス１〜リップ祠の板【１
］を変えてもよい。このように４れば累月の有効利用が
泪られる。4T,'' example (2) indicates that aluminum plates of the same size are placed facing each other, but as shown in Fig. 12(a), aluminum plates 1 and 3 are shifted left and right to face each other, and the It is also good to press the flat steel pipe 2'' and the pressure C on the opposite end surface.As shown in Fig. 12(+1),
] may be changed. In this way, if you get 4, you will be able to make effective use of the accumulated months.

本発明にＪ、って得られた熱交換素板１２Ｇま例えば第
′１３図に示ＩＮ、うに、並列状に多数配回し、流体通
路管の両端をそれぞれ連結バイブＰを介して／＼ツダ〜
管１１にろう付けし、別途黒色表面処理をし、適宜透明
カバーをイラする断熱箱イホにレッ１〜して、太陽熱温
水器として利用される。In accordance with the present invention, a large number of heat exchange blank plates 12G obtained according to the present invention are arranged in parallel, as shown in FIG. ~
It is used as a solar water heater by brazing the tube 11, separately applying a black surface treatment, and fitting it into an insulating box with a transparent cover as appropriate.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来の熱交換素板の製作説明図、第２図はその
製伯後の断面図、第３図はその加１ｆ時の斜視図、第４
図は本発明素板の一例の斜視図、第５図は本発明の製法
の一例の説明図、第６図は冷間圧接ロールの正面図、第
７図【ま第５図へ−Ａｆｆｌｉ面図、第８図は同変形例
、第９図は第５図Ｂ−１３断面図、第１０図は拡開装買
の説明図、第１１図は同へ−Ａ　ＩＩＪｉ面図、第１２
（ａ）（ｂ）図は本発明素板の変形例の断面図、第１３
図は）１Ｌ、用例の平面図をぞれぞれ示覆。 １．３・・・アルミニウム板　　２・・・扁平銅管４・
・・汀着板　　　　　５・・・Ｊ工延ロール６・・・タ
マリ部　　　　７・・・流体通路管８・・・フィン部　
　　　９・・・段部１０．１２・・・アルミニウム板コ
イル１１・・・銅管コイル　　１３・・・巻取コイル１
４・・・ブラシ　　　　１５・・・加１１０−ル１（５
・・・冷間ｊ１接＝］イル　　　１７・・・溝１ε３・
・・圧着機　　　　１９・・・押え型２０・・・ノズル １＜・・・熱交換素板　　　１〕・・・連絡バイブ１−
１・・・ヘッダー管 特許出願人 ［１本アルミニウム工業株式会社 代理人　弁理士　　小　松　秀　岳 第１図 第２図 第３図 第５図 ７ ？＋ｉ’；　’）図 Ｉρ 第１１図 ９ 召ベゴ〜′ 口大コFig. 1 is an explanatory diagram of the production of a conventional heat exchange blank plate, Fig. 2 is a cross-sectional view of the same after milling, Fig. 3 is a perspective view of it at 1f, and Fig. 4
The figure is a perspective view of an example of the blank plate of the present invention, Figure 5 is an explanatory diagram of an example of the manufacturing method of the present invention, Figure 6 is a front view of a cold pressure welding roll, and Figure 7 is a perspective view of an example of the blank plate of the present invention. Figure 8 is a modification of the same example, Figure 9 is a cross-sectional view of Figure 5 B-13, Figure 10 is an explanatory diagram of the expanded installation, Figure 11 is a side view of the same - A IIJi, Figure 12
(a) and (b) are cross-sectional views of modified examples of the blank plate of the present invention, No. 13.
The figure shows the plan view of 1L and an example of use. 1.3... Aluminum plate 2... Flat copper tube 4.
・・Floating plate 5・・J rolling roll 6・・Tamari part 7・・Fluid passage pipe 8・・・Fin part
9... Step portion 10.12... Aluminum plate coil 11... Copper tube coil 13... Winding coil 1
4...Brush 15...Additional 110-ru 1 (5
・・・Cold j1 contact =] Ile 17...Groove 1ε3・
... Crimping machine 19 ... Presser die 20 ... Nozzle 1 < ... Heat exchange blank plate 1] ... Connection vibrator 1-
1...Header pipe patent applicant [1Pon Aluminum Industry Co., Ltd. agent Patent attorney Hide Komatsu Figure 1 Figure 2 Figure 3 Figure 5 Figure 7 ? ＋i';

Claims (3)

【特許請求の範囲】[Claims] （１）　　銅系月利よりなる流体通路管がアルミニウム
系梢オ′」よりなるフィン部によって挟着されて４１つ
、該流体通路管部はフィン部と同−圧下率によって冷間
にで扁平状に圧子されたのち、ＩＩＱｊ管されたもので
あることをｔ！＋徴どＪる熱交換素板。(1) Fluid passage pipes made of copper-based steel are sandwiched between fin parts made of aluminum-based wood, and the fluid passage pipe parts are cold flattened at the same reduction rate as the fin parts. t! +Characteristic heat exchange base plate. （２）　　内面に剥蛸ハリを塗布した銅系月わ１管を２
枚のアルミニウム系月利ス１−リップにぞれぞれのズ・
１向而を粗面化して挾み、これらを溝付き［−１−ルを
用いて、そのＵ−ルの溝部分が扁平ど４１つたＳｌ・ｉ
系月利管部分に位置するＪ：うにしく、連続的に各部同
一圧下率の下に冷間圧延して圧Ｃｕｔ、め圧延プレー１
〜となし、ついで該ＬＬ延プレー１〜内に配置された扁
平銅系材料管の剥頗１剤によって圧着されていない内面
に加圧流８体を導入して該扁平銅系材料管を膨管さＩ！
流体通路を形成りることを特徴ど′りる熱交換素板の製
造法。(2) 1 copper tube with takohari applied on the inside to 2
Aluminum monthly rate slip 1-lip with each
Using a grooved [-1-ru], the groove part of the U-ru is flat and 41 Sl・i.
J located in the monthly profit pipe section: Continuously, each part is cold rolled under the same rolling reduction rate and then rolled and rolled.
〜, and then a pressurized flow 8 is introduced into the inner surface of the flat copper material tube placed in the LL rolling play 1 which is not crimped by the peeling agent 1 to expand the flat copper material tube. SaI!
A method for producing a heat exchange blank plate characterized by forming fluid passages. （３）膨管端部に段部が形成されて４する４’ｌ　ｉ’
１品求の範囲第１項記載の熱交換素板。(3) A stepped portion is formed at the end of the swelling tube to form 4'l i'
1. A heat exchange blank plate as described in Item 1 of the Requested Item.