JPS5910467A - Production of blank material for brazing - Google Patents

Abstract

PURPOSE:To obtain a blank material for brazing formed continuously with a uniform clad layer having good adhesion at a low cost, by melt-spraying a brazing alloy on the surface of an Al extrudate right after extrusion thereby forming the coating layer of the brazing alloy. CONSTITUTION:Melt spraying guns 4 are disposed so as to melt-spray a brazing alloy perpendicularly to the surface of an Al extrudate 2 from an extruder 1 from above the extrudate 2 or, if necessary, from the conveyance rolls 3 for the extrudate 2. Plural pieces of the guns 4 are properly disposed according to the shape and purpose of the extrudate 2 in this case to make the layer to be melt sprayed uniform. In the case of, for example, an extrudate for a heat sink, a brazing alloy of Al-Si is melt-sprayed to the brazing parts or the coating of the brazing alloy is formed thereon by melt spraying the brazing alloy of a low m.p. in order to provide the stronger brazing between the base material and the extrudate in the stage of extrusion.

Description

【発明の詳細な説明】 本発明はアルミニウム押出材の表面にろう合金を被覆し
たろう肘用素材の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a material for a brazing elbow, in which the surface of an aluminum extrusion is coated with a brazing alloy.

今日アルミニウムはアルミニウムの軽量性。Today, aluminum is lightweight.

加工性、熱の良導性等の利点を生かし、かつ近年のろう
付技術の発達と相まって各種産業用機器、車輛等の放熱
器、熱交換器等に使用されている。たとえば、電子機器
等に使用するヒートシンクは種々の形状および厚さを有
する押出材を基板上にろう付し、また車輛等に使用する
ラジェータはろう合金の被覆された扁平管とフィンをろ
う付して所望の形状とし、使用される。Taking advantage of its advantages such as workability and good thermal conductivity, coupled with the recent development of brazing technology, it is used in various industrial equipment, radiators and heat exchangers for vehicles, etc. For example, heat sinks used in electronic devices are made by brazing extruded materials of various shapes and thickness onto a substrate, and radiators used in vehicles are made by brazing flat tubes and fins coated with a brazing alloy. It is then shaped into the desired shape and used.

一方この種のろう肘用素材の製造方法として■あらかじ
め製造したろう合金板を芯材となるアルミニウムあるい
はアルミニウム合金（以下単にアルミニウムという）板
面にクラッドに圧延接合する圧延接合方法、そしてこの
クラツド板を所要の形状にまるめ、しかる後連続的にシ
ーム接合してクラツド管を製造する方法、■ろう合金材
と芯材となるアルミニウムをクラッドして押出加工する
クラッド押出方法、◎溶融したろう合金に芯材となるア
ルミニウムを浸漬する浸漬方法などがあシ、いずれの方
法によってもろう合金を被覆したろう肘用素材を製造す
ることができる。しかし、■の圧延接合方法の場合は、
接合すべき板面の酸化物等を除去して清浄にせねばなら
ずそのための複雑な前処理および設備が必要となること
、さらにこのクラツド板を用いて管を製造する場合はシ
ーム接合部分のろう合金層に所期する均一な厚さのもの
を得難いこと。一方■のクラッド押出方法の場合はクラ
ッドした二重ビレットを必要とすること。On the other hand, as a manufacturing method for this kind of material for brazing elbows, there is a rolling joining method in which a pre-manufactured brazing alloy plate is rolled and joined to a core plate of aluminum or aluminum alloy (hereinafter simply referred to as aluminum) to a cladding, and this cladding plate is A method of manufacturing a clad pipe by rounding it into a desired shape and then continuously seaming it. ■A cladding extrusion method of cladding and extruding a brazing alloy material and aluminum as a core material. There are various methods, including a dipping method in which aluminum serving as a core material is immersed, and a material for a brazing elbow coated with a brazing alloy can be produced by any method. However, in the case of the rolling joining method (■),
The surfaces of the plates to be joined must be cleaned to remove oxides, etc., which requires complex pre-treatment and equipment, and when manufacturing pipes using this clad plate, the solder at the seam joints must be cleaned. It is difficult to obtain the desired uniform thickness of the alloy layer. On the other hand, in the case of clad extrusion method (■), a clad double billet is required.

その上に押出材の全長に亘るろう合金層の厚さの均一性
の維持、コントロールが難かしく２合金の組合せたとえ
ば融点の低いろり合金と融点の高いアルミニウムの場合
は押出加工できないこと。更に◎の浸漬方法の場合は形
状的な制約。Furthermore, it is difficult to maintain and control the uniformity of the thickness of the brazing alloy layer over the entire length of the extruded material, and extrusion cannot be performed in the case of a combination of two alloys, such as a brazing alloy with a low melting point and aluminum with a high melting point. Furthermore, in the case of ◎ dipping method, there are shape constraints.

ろう合金層の厚さおよび均一性の維持、コントロールが
難しいこと等の問題点がある。There are problems such as difficulty in maintaining and controlling the thickness and uniformity of the brazing alloy layer.

本発明は、上記１−だような実情に基づいて検討し開発
されたものであって１通常の押出プロセスに溶射プロセ
スを組合せることにより、連続的にしかも各種形状のア
ルミニウム押出材の外表面に均一なろう合金層を強固に
形成せしめることができることを確認した。The present invention has been studied and developed based on the above-mentioned circumstances. 1. By combining a normal extrusion process with a thermal spraying process, the outer surface of aluminum extrusions of various shapes can be continuously and It was confirmed that a uniform brazing alloy layer could be formed strongly.

」二重したような本発明方法についてさらに説明すると
、温間押出′または熱間押出されたアルミニウム押出材
は、押出直後においては表面は清浄でかつ酸化皮膜未形
成の活性な表面であ机それ故に溶射されたろう合金は素
地に機械的に付着した後直ちにぬれ易い高温表面に融着
し。To further explain the method of the present invention, the aluminum extruded material subjected to warm extrusion or hot extrusion has a clean surface and an active surface with no oxide film formed immediately after extrusion. Therefore, after being mechanically attached to the substrate, the sprayed braze alloy immediately fuses to the wettable hot surface.

また一部は表面に拡散して１強固に密着するものと考え
られる。It is also believed that some of the particles diffuse to the surface and adhere firmly to the surface.

本発明方法の実施態様としては、押出機のダイス出口端
近くに自動溶射装置を、押出材の所定表面または全表面
を均一に被覆するため１基または複数基設置して行なう
もので、自動溶射装置の設置Ｗ例としては、第１図装置
側面図、第２図および第３図押出材進行方向からの正面
図に示すように押出機１からの押出材２に対して上方か
ら、また下方は必要に応じて押出材の搬送用ローラ６の
中間から、溶射ガン４にょシ押出材面に対し垂直溶射と
なるよう配置し、溶射被覆層の均一化を図っている。な
お溶射ガンの配置は、押出材の形状、目的に応じ１基以
上複数基を適宜配置すれば良い。In an embodiment of the method of the present invention, one or more automatic thermal spraying devices are installed near the die exit end of the extruder in order to uniformly coat a predetermined surface or the entire surface of the extruded material. As an example of the installation W of the device, as shown in the side view of the device in FIG. 1, and the front view from the direction of progress of the extruded material in FIGS. 2 and 3, If necessary, the thermal spraying gun 4 is arranged to spray perpendicularly to the surface of the extruded material from the middle of the roller 6 for conveying the extruded material, thereby making the thermal spray coating layer uniform. Note that one or more thermal spray guns may be appropriately arranged depending on the shape and purpose of the extruded material.

たとえば、ピー１−シンク用の押出型材の場合は押出の
際に基台と型制のろう伺を強固にするため、ろう付箇所
にλｇ−８１系のろう合金を溶射し、あるいは低融点ろ
う合金を溶射して、うう合金の被覆層を形成せしめる。For example, in the case of extruded mold materials for P1-sinks, in order to strengthen the solder joint between the base and mold during extrusion, a λg-81 type brazing alloy is thermally sprayed at the brazing points, or a low melting point wax is used. The alloy is thermally sprayed to form a coating layer of the alloy.

また特に熱交換器等の部品で孔腐食を好まないたとえば
冷媒の通路となる扁平管の如き部品の場合は押出の際に
Ｚｎを含有するろう合金、−例としては人、ｅ−Ｓムー
Ｚｎ系のろう合金を溶射することが特に有効であって、
その後のろう何工程でＺｎの拡散１を該扁平管の表面に
形成することができ。Particularly in the case of parts such as heat exchangers that do not like pit corrosion, such as flat tubes that serve as refrigerant passages, brazing alloys containing Zn are used during extrusion. It is particularly effective to thermally spray a brazing alloy based on
In the subsequent waxing step, Zn diffusion 1 can be formed on the surface of the flat tube.

孔腐食を適切に防止することができる。Pore corrosion can be appropriately prevented.

本発明方法によれば、溶射に通常必要とされるプラスチ
ング、予備加熱を要せず優れた皮膜密着性を得ることが
でき、工程的にも簡略化される。なお、ろう合金溶射に
際しては１粒子が酸化され易いので、これを防止するに
は、火焔をなるべく還元性となし、要すれば不活性ガス
を利用する。また溶射距離をなるべく短かくするなどの
一般的配慮が必要でア＃）、不活性雰囲気下で溶射工程
を行なっても良い。また押出材の押出速度と溶射条件を
制御することによりクラッド層の厚さを任意に制御する
ことが可能である。According to the method of the present invention, excellent film adhesion can be obtained without the need for plasting and preheating that are normally required for thermal spraying, and the process is also simplified. Note that during thermal spraying of a brazing alloy, one particle is likely to be oxidized, so to prevent this, the flame should be made as reducing as possible, and if necessary, an inert gas should be used. In addition, general considerations such as making the spraying distance as short as possible are necessary, and the spraying process may be carried out under an inert atmosphere. Further, by controlling the extrusion speed of the extruded material and the thermal spraying conditions, it is possible to arbitrarily control the thickness of the cladding layer.

本発明方法によれば、均一で密着性の良いクラッド層が
連続的にしかも各種形材の外表面に形成される。装置Ｗ
も簡便であって、コスト面ににおいても低摩な実用性に
浸れたクラツド材の製造方法ということができる。According to the method of the present invention, a uniform and highly adhesive cladding layer is continuously formed on the outer surface of various shapes. Equipment W
This method is also simple and can be said to be a practical method for manufacturing cladding materials with low friction and low cost.

本発明方法によるものの具体的な実施例について説明す
ると、以下の通りである。Specific examples of the method according to the present invention will be described below.

実施例１ 第１図および第２図に示すように、押出機のダイス端近
傍に自動溶射設備１基を設置し、第７の櫛歯型ヒートシ
ンクを押出速度約１８ｍ／分で押出成形し、押出中に第
２表に示す溶射条件で第１表に示す組成のろう合金線を
用いて基板の取付けられる部分に連続的に溶射を行なっ
た。Example 1 As shown in FIGS. 1 and 2, one automatic thermal spraying equipment was installed near the die end of the extruder, and a seventh comb-shaped heat sink was extruded at an extrusion speed of about 18 m/min. During extrusion, under the thermal spraying conditions shown in Table 2, a brazing alloy wire having the composition shown in Table 1 was continuously sprayed onto the part to be attached to the substrate.

第　　　１　　　表 第　　　２　　　表 その結果、押出材表面に１００−ｍ−ｇ　／　ｍ”のろ
う合金被覆層が形成された。Table 1 Table 2 As a result, a brazing alloy coating layer of 100-mg/m'' was formed on the surface of the extruded material.

このようにして成形でれた櫛歯型材と基板（図示せず）
とを１１合せて１次の第３表に示す条件で、ろう付を行
ないヒートシンクのろう付品を作成した。The comb-shaped material and substrate formed in this way (not shown)
11 were combined and brazed under the conditions shown in Table 3 below to create a brazed heat sink.

第　　　３　　　表 接着率９５％以上で良好なろう接部を形成し。Table 3 Forms a good soldered joint with an adhesion rate of 95% or more.

十分なろう伺性が得られ、アルミニウムのろう付に対し
、極めて有効な方法であることが示された。Sufficient solderability was obtained, and it was shown to be an extremely effective method for brazing aluminum.

実施例２ 実施例１の如く、第３図に示すように、押出機のダイス
端近傍に自′ｌＩＪ溶射設備４基を設置し。Example 2 As in Example 1, as shown in FIG. 3, four IJ thermal spraying equipment were installed near the die end of the extruder.

第４表に示す組成でかつ実施例１に示す寸法のビレット
を用い、第４図に示す断面形状の幅２６咽、高さ５關、
４本の冷媒流路を有する管厚０．Ｂｍｍ＋　障壁厚１．
０ｍｍの扁平管を押出速度約１５ｍ／分で押出成形し、
押出中に第２表に示す溶射条件で第４表に示す組成のＺ
ｎ含有ろう合金線を用いて全表面に連続的に溶射を行な
った０ 第　　　４　　　表 その結果、押出材表面に約５０　ｐｍのろう合金被覆層
が形成された。Using a billet having the composition shown in Table 4 and the dimensions shown in Example 1, the cross-sectional shape shown in FIG.
Pipe thickness 0.0 with 4 refrigerant channels. Bmm+ Barrier thickness 1.
A 0 mm flat tube was extruded at an extrusion speed of about 15 m/min,
Z of the composition shown in Table 4 under the thermal spraying conditions shown in Table 2 during extrusion.
As a result, a brazing alloy coating layer of about 50 pm was formed on the extruded material surface by continuous thermal spraying on the entire surface using n-containing brazing alloy wire.

このようにして成形された押出扁平管とＡ３００！、材
で形成されたコルゲートフィンとを組合せて、第３表に
示す条件で、ろう付を行ない積層型のろう付品を作成し
た。The extruded flat tube formed in this way and A300! , and a corrugated fin made of material, and brazing was performed under the conditions shown in Table 3 to create a laminated brazed product.

ろう付温度に保持された結呆押出扁平管表層部にＺｎ濃
度１０重量％、Ｚｎ拡散層深さ８０茫δ拡散層が形成さ
れていることがＸ線マイクロアナライザーにより確認さ
れた。とのろう付品をＪＩ８　１■　８６６１　に規定
されているＣＡＳＳ０ 試験７２０ｈｒを行なった結果１発生した腐食は何れも
面食形態で、孔食の発生は認められず。It was confirmed by an X-ray microanalyzer that a Zn concentration of 10% by weight and a Zn diffusion layer depth of 80mm δ diffusion layer were formed in the surface layer of the extruded flat tube that had been kept at the brazing temperature. As a result of conducting CASS0 test for 720 hours as specified in JI8 1■ 8661 on brazed products, all corrosion that occurred was in the form of face corrosion, and no pitting corrosion was observed.

均一で密着１７たＺｎ含有ろう合金被覆層力ぶ形成され
ていることが示された。It was shown that a uniform and adherent Zn-containing braze alloy coating layer was formed.

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

第１図は本発明方法火施態様例の側■ｎ図、第２図およ
び第６図は溶射ガンの配置ｆ！ｌを示す押出拐進行方向
からの正面図、第４図は押出扁平管の拡大断面図である
。 １は押出機、２は押出材、５は搬送用ローラ４は溶射ガ
ン。 特許出願人　日本軽金属株式会社FIG. 1 is a side view of an embodiment of the method of the present invention, and FIGS. 2 and 6 are views showing the arrangement of a thermal spray gun. FIG. 4 is an enlarged sectional view of the extruded flat tube. 1 is an extruder, 2 is an extruded material, and 5 is a conveyance roller 4 is a thermal spray gun. Patent applicant Nippon Light Metal Co., Ltd.

Claims (1)

【特許請求の範囲】 １、押出成形機の押出口近傍におけるアルミニウム押出
材の表面にろう合金を溶射してろう合金の被覆層を形成
したことを特徴とするろう肘用素材の製造方法。 ２、前記ろう合金が亜鉛を含有していることを特徴とす
る特許請求の範囲第１項記載のろう肘用素材の製造方法
。[Scope of Claims] 1. A method for manufacturing a material for a brazing elbow, characterized in that a coating layer of a brazing alloy is formed by spraying a brazing alloy onto the surface of an extruded aluminum material in the vicinity of an extrusion port of an extrusion molding machine. 2. The method for producing a material for a brazing elbow according to claim 1, wherein the brazing alloy contains zinc.