JP2013043184A - Method for caulking magnesium alloy plate - Google Patents

Method for caulking magnesium alloy plate Download PDF

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JP2013043184A
JP2013043184A JP2011180702A JP2011180702A JP2013043184A JP 2013043184 A JP2013043184 A JP 2013043184A JP 2011180702 A JP2011180702 A JP 2011180702A JP 2011180702 A JP2011180702 A JP 2011180702A JP 2013043184 A JP2013043184 A JP 2013043184A
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upper plate
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JP5813414B2 (en
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Yasuo Shimokawa
養雄 下川
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TSUTSUMI IND Inc
TSUTSUMI INDUSTRIES Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a method for caulking magnesium alloy plates which contains magnesium of ≥90 mass%.SOLUTION: Two or more magnesium alloy plates are lapped, the joining position 9 of the plurality of the magnesium alloy plates 1a, 1b is heated and the magnesium alloy plates are pushed into a die 3 with a punch 2 while keeping a constant heating temperature, and thereby the magnesium alloy plates are deformed plastically and subjected to clinching caulking.

Description

本発明は、Mg合金板を塑性変形させて接合するカシメ方法に関するものである。   The present invention relates to a caulking method in which an Mg alloy plate is joined by plastic deformation.

一般に、ＪＩＳ規格AZ31等のマグネシウムを主成分（Mg含有量90質量％以上）とする合金（以下、Mg合金という）は、軽量かつ高強度で、しかも電磁波遮蔽性や放熱性に優れているので、携帯電話やＴＶカメラ等の電子機器の筺体等の素材として注目されている。
しかしながら、Mg合金板は接合することが難しいので、Mg合金からなる製品を得るために、鋳造が広く行なわれている。ところが、鋳造によって得られる製品は、寸法精度が劣り、生産性が低いという問題がある。 In general, alloys such as JIS standard AZ31 whose main component (Mg content is 90% by mass or more) (hereinafter referred to as Mg alloy) is light and high in strength, and has excellent electromagnetic shielding and heat dissipation. It has been attracting attention as a material for housings of electronic devices such as mobile phones and TV cameras.
However, since it is difficult to join Mg alloy sheets, casting is widely performed in order to obtain products made of Mg alloys. However, the product obtained by casting has a problem that the dimensional accuracy is inferior and the productivity is low.

鋳造以外の成形技術としては、加熱した型を用いて、板状のMg合金（以下、Mg合金板という）に曲げ加工や絞り加工等を施して所定の形状に成形すれば、寸法精度の良好なMg合金板の成形品を得ることは可能である。しかし、その成形品同士を接合しなければならないので、Mg合金板の接合技術を確立する必要がある。
たとえば特許文献１には、Al−Mg系のAl合金板の抵抗スポット溶接方法が開示されている。この技術は、自動車ボディ等に使用されるAl−Mg系のAl合金板を、通電によって局部的に溶融させ、さらに凝固させることによって、図３に示すようなナゲット５を形成して接合するものである。そのAl−Mg系のAl合金板のMg含有量は５〜９wt％であり、主成分はAlであるから抵抗スポット溶接を容易に行なうことができる。 As a molding technique other than casting, if a plate-shaped Mg alloy (hereinafter referred to as Mg alloy plate) is bent or drawn into a predetermined shape by using a heated mold, the dimensional accuracy is good. It is possible to obtain a molded product of a Mg alloy plate. However, since the molded products must be joined together, it is necessary to establish a joining technique for Mg alloy sheets.
For example, Patent Document 1 discloses a resistance spot welding method for an Al-Mg Al alloy plate. In this technology, an Al-Mg-based Al alloy plate used for an automobile body or the like is locally melted by energization and further solidified to form and join a nugget 5 as shown in FIG. It is. The Al-Mg-based Al alloy plate has an Mg content of 5 to 9 wt%, and since the main component is Al, resistance spot welding can be easily performed.

ところが、Mgを90質量％以上含有するMg合金板の接合に抵抗スポット溶接法を適用すると、Mg合金板は放熱性が高い性質であることから、Mg合金板を中心部まで十分に加熱して溶融させることができないので、Mg合金板の溶接は困難であった。また、他の溶接法（たとえばアーク溶接等）を用いても、Mg合金板の放熱性が高い故に、Mg合金板の溶接による接合は困難であった。   However, if the resistance spot welding method is applied to the joining of Mg alloy plates containing 90% by mass or more of Mg, the Mg alloy plate has a high heat dissipation property, so the Mg alloy plate is sufficiently heated to the center. Since it could not be melted, it was difficult to weld Mg alloy sheets. Further, even when other welding methods (for example, arc welding) are used, it is difficult to join the Mg alloy plates by welding because the heat dissipation of the Mg alloy plates is high.

そこで、Mg合金板を溶接以外の方法で接合する技術としては、たとえば特許文献２に、無機接合層を介してマグネシウム合金片を接合したマグネシウム合金部材が開示されている。この技術は、マグネシウム合金片の接合面に無機系接着剤を塗布し、その接合面を圧接して接合した後、さらに熱処理により有機溶媒を除去するものであり、製造工程が複雑になり、生産性の低下を招くという問題がある。   Thus, as a technique for joining Mg alloy plates by a method other than welding, for example, Patent Document 2 discloses a magnesium alloy member in which magnesium alloy pieces are joined via an inorganic joining layer. In this technology, an inorganic adhesive is applied to the joint surface of the magnesium alloy piece, the joint surface is joined by pressure welding, and then the organic solvent is removed by heat treatment. There is a problem of causing a decline in sex.

また、特許文献３には、MgおよびMg合金の摩擦攪拌接合方法が開示されているが、この技術は、２枚のMg合金板材を突き合わせて、その突き合わせ部を摩擦攪拌接合用ツールで摩擦攪拌して、発生する摩擦熱を利用して接合するものである。この方法は、Mg合金板がかなり厚い場合に有効であり、比較的薄いMg合金板では接合できないという問題がある。   Further, Patent Document 3 discloses a friction stir welding method for Mg and Mg alloy. This technique is a method in which two Mg alloy plate materials are butted and the butted portion is friction stir using a friction stir welding tool. Then, joining is performed using the generated frictional heat. This method is effective when the Mg alloy plate is considerably thick, and there is a problem that it cannot be joined by a relatively thin Mg alloy plate.

特開平5-277751号公報Japanese Patent Laid-Open No. 5-277751 特開2010-125624号公報JP 2010-125624 A 特開2011-79022号公報JP 2011-79022 A

本発明は、Mgを90質量％以上含有するMg合金板のカシメ方法を提供することを目的とする。   An object of the present invention is to provide a caulking method for an Mg alloy sheet containing 90% by mass or more of Mg.

発明者は、Mg合金板を塑性変形させてカシメ接合する方法について検討した結果、Mg合金板が厚い場合にはカシメ接合は困難であるが、携帯電話やＴＶカメラ等の筺体等の素材として使用される比較的薄いMg合金板では、Mg合金板を一定の加熱温度に保持しながら、図２(a)に示すようなパンチ２とダイス３を用いてプレス加工すれば、クリンチングカシメ接合が可能であるという知見を得た。   As a result of examining the method of caulking and joining the Mg alloy plate by plastic deformation, the inventor finds that caulking joining is difficult when the Mg alloy plate is thick, but it is used as a material for casings of mobile phones and TV cameras. With a relatively thin Mg alloy plate, clinching and caulking joining can be achieved by pressing the punch 2 and the die 3 as shown in FIG. 2 (a) while maintaining the Mg alloy plate at a constant heating temperature. The knowledge that it was possible was obtained.

ここで、クリンチングカシメ接合とは、図２(b)に示すように、上板1aに突出部４を形成し、その突出部４を下板1bと噛み合わせて、上板1aと下板1bをカシメ接合するものである。
本発明は、このような知見に基づいてなされたものである。
すなわち本発明は、Mg合金板を複数枚重ねて、複数枚のMg合金板の接合位置を加熱し、一定の加熱温度に保持しながら加熱されたMg合金板をパンチでダイス内に押し込むことによってMg合金板を塑性変形させてクリンチングカシメを行なうMg合金板のカシメ方法である。 Here, as shown in FIG. 2 (b), clinching and caulking is performed by forming a protruding portion 4 on the upper plate 1a and engaging the protruding portion 4 with the lower plate 1b. 1b is caulked and joined.
The present invention has been made based on such knowledge.
That is, the present invention stacks a plurality of Mg alloy plates, heats the joining position of the plurality of Mg alloy plates, and presses the heated Mg alloy plate into the die with a punch while maintaining a constant heating temperature. This is a method of caulking an Mg alloy plate in which the Mg alloy plate is plastically deformed and clinched and caulked.

本発明のMg合金板のカシメ方法においては、Mg合金板の厚さを0.1〜４mmとし、加熱温度を250〜300℃とすることが好ましい。また、加熱を、ヒーターからの伝熱または電極からの通電によって行なうことが好ましい。   In the caulking method of the Mg alloy plate of the present invention, it is preferable that the thickness of the Mg alloy plate is 0.1 to 4 mm and the heating temperature is 250 to 300 ° C. Moreover, it is preferable to perform heating by heat transfer from a heater or energization from an electrode.

本発明によれば、Mgを90質量％以上含有するMg合金板を簡略な方法で、カシメ接合を行なうことが可能であるから、携帯電話やＴＶカメラ等の筺体等のMg合金板が使用される製品の製造に有利であり、産業上格段の効果を奏する。   According to the present invention, a Mg alloy plate containing 90% by mass or more of Mg can be caulked and joined by a simple method. Therefore, an Mg alloy plate such as a mobile phone or a TV camera is used. This is advantageous for the manufacture of products and has a remarkable industrial effect.

本発明を適用してMg合金板のクリンチングカシメを行なった例を示す斜視図であり、(a)は上板側、(b)は下板側を示す。It is a perspective view which shows the example which performed the crimping crimping of the Mg alloy board by applying this invention, (a) shows the upper board side, (b) shows the lower board side. クリンチングカシメの例を模式的に示す断面図であり、(a)上板，下板，ダイス，パンチの配置の例、(b)接合部の例を示す。It is sectional drawing which shows the example of a clinching caulking typically, (a) The example of arrangement | positioning of an upper board, a lower board, dice | dies, and a punch, (b) The example of a junction part is shown. スポット溶接による接合部の例を模式的に示す断面図である。It is sectional drawing which shows the example of the junction part by spot welding typically.

図１は、Mgを90質量％以上含有するMg合金板を２枚重ねてクリンチングカシメ接合を行なった接合部９の例を示す斜視図であり、(a)は上板側、(b)は下板側を示す。また、図２は、クリンチングカシメ接合の例を模式的に示す断面図であり、(a)は上板1a，下板1b，ダイス２，パンチ３の配置、(b)は接合部９を示す。以下に、図１，２を参照して、Mg合金板を２枚重ねてクリンチングカシメ接合を行なう手順について説明する。ここでは２枚のMg合金板のうち、上側（パンチ２側）のMg合金板を上板1a、下側（ダイス３側）のMg合金板を下板1bとする。   FIG. 1 is a perspective view showing an example of a joint portion 9 in which two Mg alloy plates containing Mg of 90% by mass or more and clinching and caulking joining are performed, (a) is an upper plate side, (b) Indicates the lower plate side. 2 is a cross-sectional view schematically showing an example of clinching and caulking, where (a) shows the arrangement of the upper plate 1a, the lower plate 1b, the die 2 and the punch 3, and (b) shows the joining portion 9. FIG. Show. In the following, referring to FIGS. 1 and 2, a procedure for performing clinching and caulking joining by stacking two Mg alloy plates will be described. Here, of the two Mg alloy plates, the upper (the punch 2 side) Mg alloy plate is the upper plate 1a, and the lower (die 3 side) Mg alloy plate is the lower plate 1b.

Mg合金板のクリンチングカシメ接合で使用するパンチ２は、図２(a)に示すように、その下端部に円形の突起６を有しており、ダイス３は、円形の凹部７の底部に円環状の溝８を有する。パンチ２の下面21（すなわち突起６の下面）とダイス３の上面31は、いずれも平面とする。パンチ２の下面21と上板1aの上面がそれぞれに上板1a、下板1bに当接する位置が、クリンチングカシメ接合による接合位置となる。   As shown in FIG. 2 (a), the punch 2 used for clinching and caulking the Mg alloy plate has a circular protrusion 6 at its lower end, and the die 3 is formed at the bottom of the circular recess 7. An annular groove 8 is provided. The lower surface 21 of the punch 2 (that is, the lower surface of the protrusion 6) and the upper surface 31 of the die 3 are both flat. The position where the lower surface 21 of the punch 2 and the upper surface of the upper plate 1a are in contact with the upper plate 1a and the lower plate 1b, respectively, is a bonding position by clinching and caulking.

Mg合金板のクリンチングカシメ接合においては、図２(a)に示すように、上板1a，下板1bをパンチ２とダイス３で挟持して、上板1a，下板1bの接合位置を加熱し、一定の加熱温度に保持しながら、パンチ２で上板1aと下板1bをダイス３に押し込むことによって、図２(b)に示すように上板1aと下板1bを塑性変形させて接合する。このとき、上板1aと下板1bが溝８に流れ込むことによって、接合部９では、上板1aに突出部４が形成され、かつその突出部４が下板1bと噛み合い、上板1aと下板1bが強固に接合される。   In clinching and caulking of Mg alloy plates, as shown in Fig. 2 (a), the upper plate 1a and the lower plate 1b are sandwiched between the punch 2 and the die 3, and the joining positions of the upper plate 1a and the lower plate 1b are determined. While heating and holding at a constant heating temperature, the upper plate 1a and the lower plate 1b are pushed into the die 3 with the punch 2 to plastically deform the upper plate 1a and the lower plate 1b as shown in FIG. 2 (b). And join. At this time, the upper plate 1a and the lower plate 1b flow into the groove 8, so that a projection 4 is formed on the upper plate 1a at the joint 9, and the projection 4 meshes with the lower plate 1b, The lower plate 1b is firmly joined.

上板1aと下板1bの接合位置の加熱温度は250〜300℃の範囲内が好ましい。接合位置における上板1a，下板1bの温度が250℃未満では、上板1a，下板1bが変形し難いので、クリンチングカシメ接合が困難になる。一方、接合位置における上板1a，下板1bの温度が300℃を超えると、上板1a，下板1bが局部的に溶融するので、クリンチングカシメ接合が困難になる。   The heating temperature at the joining position of the upper plate 1a and the lower plate 1b is preferably in the range of 250 to 300 ° C. If the temperature of the upper plate 1a and the lower plate 1b at the joining position is less than 250 ° C., the upper plate 1a and the lower plate 1b are not easily deformed, so that clinching and caulking joining becomes difficult. On the other hand, when the temperature of the upper plate 1a and the lower plate 1b at the joining position exceeds 300 ° C., the upper plate 1a and the lower plate 1b are locally melted, so that clinching and caulking joining becomes difficult.

上板1aと下板1bの接合位置を加熱する手段は特に限定しないが、上記した通りパンチ２とダイス３がそれぞれ上板1a，下板1bに当接することから、パンチ２とダイス３にヒーターを配設して上板1a，下板1bに伝熱する、あるいはパンチ２とダイス３に電極を配設して上板1a，下板1bに通電する等によって加熱することが好ましい。
ヒーターを配設したパンチ２，ダイス３から上板1a，下板1bに伝熱する場合は、パンチ２またはダイス３のいずれか片方にヒーターを配設して、上板1a，下板1bに伝熱することは可能である。しかし、Mg合金板は放熱性が極めて高いことから、パンチ２およびダイス３の両方にヒーターを配設して上板1a，下板1bに伝熱することによって、接合位置の上板1a，下板1bを加熱することが好ましい。 The means for heating the joining position of the upper plate 1a and the lower plate 1b is not particularly limited. As described above, the punch 2 and the die 3 are in contact with the upper plate 1a and the lower plate 1b, respectively. It is preferable to heat by transferring heat to the upper plate 1a and the lower plate 1b, or by providing electrodes on the punch 2 and the die 3 and energizing the upper plate 1a and the lower plate 1b.
When heat is transferred from the punch 2 and the die 3 provided with the heater to the upper plate 1a and the lower plate 1b, a heater is provided on either the punch 2 or the die 3 so that the upper plate 1a and the lower plate 1b are heated. It is possible to transfer heat. However, since the Mg alloy plate has extremely high heat dissipation, heaters are installed on both the punch 2 and the die 3 to transfer heat to the upper plate 1a and the lower plate 1b, so It is preferable to heat the plate 1b.

また、電極を配設したパンチ２，ダイス３から上板1a，下板1bに通電して、その抵抗発熱によって接合位置の上板1a，下板1bを加熱する場合は、一般の単相交流電源が使用できるので、パンチ２とダイス３の極性は特に限定しない。
通電時間は、50Hzの単相交流では７〜12サイクル（すなわち0.14〜0.24秒）の範囲内が好ましい。通電時間が0.14秒未満では、接合位置の上板1a，下板1bを十分に加熱できないので、上板1a，下板1bが十分に変形せず、その結果、クリンチングカシメ接合が困難になる。一方、通電時間が0.24秒を超えると、上板1a，下板1bが過剰に加熱されて局部的に溶融して、クリンチングカシメ接合が困難になる。 When the upper plate 1a and the lower plate 1b are energized from the punch 2 and the die 3 provided with the electrodes and the upper plate 1a and the lower plate 1b are heated by the resistance heat, a general single-phase alternating current is used. Since the power source can be used, the polarities of the punch 2 and the die 3 are not particularly limited.
The energization time is preferably within a range of 7 to 12 cycles (that is, 0.14 to 0.24 seconds) for a single-phase AC of 50 Hz. If the energization time is less than 0.14 seconds, the upper plate 1a and lower plate 1b cannot be sufficiently heated at the joining position, so the upper plate 1a and lower plate 1b do not deform sufficiently, and as a result, clinching and caulking joining becomes difficult. . On the other hand, if the energization time exceeds 0.24 seconds, the upper plate 1a and the lower plate 1b are excessively heated and locally melted, and clinching and caulking joining becomes difficult.

通電する電流は、2.0〜2.5kAの範囲内が好ましい。電流が2.0kA未満では、接合位置の上板1a，下板1bを十分に加熱できないので、上板1a，下板1bが十分に変形せず、その結果、クリンチングカシメ接合が困難になる。一方、電流が2.5kAを超えると、上板1a，下板1bが過剰に加熱されて局部的に溶融して、クリンチングカシメ接合が困難になる。
そして、上板1a，下板1bの接合位置の加熱に引き続き、パンチ２をエアーシリンダーで押下してクリンチングカシメを行なう。パンチ２を押下するためにエアーシリンダーに付与するエアー圧は、１台のパンチで0.3〜0.5MPaの範囲内が好ましい。エアー圧が0.3MPa未満では、パンチ２の押下が弱いので、上板1a，下板1bは変形しない。一方、エアー圧が0.5MPaを超えると、上板1a，下板1bの変形速度が速すぎるので、突出部４が十分に形成されず、クリンチングカシメ接合が不十分となる。 The current to be applied is preferably in the range of 2.0 to 2.5 kA. When the current is less than 2.0 kA, the upper plate 1a and the lower plate 1b cannot be sufficiently heated at the joining position, so that the upper plate 1a and the lower plate 1b are not sufficiently deformed, and as a result, clinching and crimping joining becomes difficult. On the other hand, when the current exceeds 2.5 kA, the upper plate 1a and the lower plate 1b are excessively heated and locally melted, and clinching and caulking joining becomes difficult.
Then, following the heating of the joining position of the upper plate 1a and the lower plate 1b, the punch 2 is pressed by an air cylinder to perform clinching and caulking. The air pressure applied to the air cylinder for pressing the punch 2 is preferably within a range of 0.3 to 0.5 MPa with one punch. When the air pressure is less than 0.3 MPa, the pressing of the punch 2 is weak, so that the upper plate 1a and the lower plate 1b are not deformed. On the other hand, if the air pressure exceeds 0.5 MPa, the deformation speed of the upper plate 1a and the lower plate 1b is too high, so that the protrusion 4 is not sufficiently formed, and clinching and caulking joining becomes insufficient.

パンチ２を押下するにあたって、上板1a，下板1bが所定の温度に加熱された後、パンチ２の押下までに長時間が経過すると、放熱性が高い上板1aと下板1bの温度が急速に低下するので、クリンチングカシメ接合が困難になる。そこで、パンチ２とダイス３がそれぞれ上板1a，下板1bに当接した状態で、パンチ２のエアーシリンダーに上記したエアー圧を付与しながら、上板1a，下板1bを加熱することが好ましい。このようにして、接合位置の上板1a，下板1bを一定の加熱温度に保持しながらパンチ２を押下して、クリンチングカシメ接合を行なうことが可能となる。   When the punch 2 is pressed, if the upper plate 1a and the lower plate 1b are heated to a predetermined temperature and a long time elapses until the punch 2 is pressed, the temperature of the upper plate 1a and the lower plate 1b having high heat dissipation is increased. Since it decreases rapidly, clinching and caulking joining becomes difficult. Therefore, the upper plate 1a and the lower plate 1b can be heated while the air pressure is applied to the air cylinder of the punch 2 with the punch 2 and the die 3 in contact with the upper plate 1a and the lower plate 1b, respectively. preferable. In this way, it is possible to perform clinching and crimping joining by pressing the punch 2 while maintaining the upper plate 1a and the lower plate 1b at the joining positions at a constant heating temperature.

同一の接合位置で、パンチ２を押下する回数は、１回とすることが好ましい。パンチを２回以上押下するためには、上板1a，下板1bの接合位置を加熱した後に時間を要するので、放熱性が高い上板1aと下板1bの温度が急速に低下して、２回目以降の押下が困難になる。そのため、パンチ２の押下を１回に限定してクリンチングカシメ接合を行なうことが好ましい。   The number of times the punch 2 is pressed at the same joining position is preferably one. In order to depress the punch twice or more, it takes time after heating the joining position of the upper plate 1a and the lower plate 1b. Therefore, the temperature of the upper plate 1a and the lower plate 1b having high heat dissipation decreases rapidly, It becomes difficult to press the second and subsequent times. For this reason, it is preferable to perform clinching and caulking bonding by limiting the pressing of the punch 2 to one time.

このようにしてクリンチングカシメ接合を行ない、Mg合金板を塑性変形させることによって、図１に示すような接合部９を形成する。図１には接合部９を３ケ所に設ける例を示したが、本発明では接合部９の数は限定しない。上板1a，下板1bの大きさや接合部に求められる接合強さ等に応じて、接合部９の数を適宜設定する。
たとえば図１に示すように、接合部９を３ケ所に設ける場合は、３組のパンチ２とダイス３を並列して同時にクリンチングカシメ接合を行なう、あるいは１組のパンチ２とダイス３を用いて、それぞれの接合位置でクリンチングカシメ接合を合計３回行なうことによって、接合部９を３ケ所に設けることができる。 In this manner, clinching and caulking are performed, and the Mg alloy plate is plastically deformed, thereby forming the joint 9 as shown in FIG. Although the example which provides the junction part 9 in three places was shown in FIG. 1, in this invention, the number of the junction parts 9 is not limited. The number of joints 9 is appropriately set according to the size of the upper plate 1a and the lower plate 1b, the joint strength required for the joints, and the like.
For example, as shown in FIG. 1, when three joints 9 are provided, three sets of punches 2 and dies 3 are paralleled and clinching and caulking are performed simultaneously, or one set of punches 2 and dies 3 is used. Thus, the joint portions 9 can be provided at three locations by performing clinching and crimping joints at each joining position three times in total.

Mg合金板（すなわち上板1a，下板1b）の厚さは、いずれも0.1〜４mmの範囲内が好ましい。厚さが0.1mm未満では、加熱によってMg合金板の温度が急激に上昇するので、反りが発生し易くなる。一方、Mg合金板は放熱性が極めて高い性質であることから、厚さが４mmを超えると、加えられた熱量が放散されるので、加熱してもMg合金板の温度が上昇せず、その結果、クリンチングカシメ接合が困難になる。   The thicknesses of the Mg alloy plates (that is, the upper plate 1a and the lower plate 1b) are preferably in the range of 0.1 to 4 mm. If the thickness is less than 0.1 mm, the temperature of the Mg alloy plate rapidly increases due to heating, and thus warpage is likely to occur. On the other hand, since the Mg alloy plate has a very high heat dissipation property, when the thickness exceeds 4 mm, the applied heat is dissipated, so the temperature of the Mg alloy plate does not rise even when heated. As a result, clinching and caulking joining becomes difficult.

なお、上板1aと下板1bの厚さは必ずしも同一とする必要はないが、クリンチングカシメ接合によって、図２(b)に示すように、上板1aに十分な大きさの突出部４を安定して形成し、かつその突出部４を下板1bと噛み合わせて接合部９を形成するためには、同じ厚さの上板1aと下板1bを接合することが好ましい。
２枚のMg合金板をクリンチングカシメ接合によって接合する手順を説明したが、本発明は、接合するMg合金板を２枚に限定するものではない。３枚以上のMg合金板を接合する場合も、同様の手順でクリンチングカシメ接合を行なうことができる。 Although the thicknesses of the upper plate 1a and the lower plate 1b are not necessarily the same, as shown in FIG. 2 (b), the protruding portion 4 having a sufficient size on the upper plate 1a is obtained by clinching and caulking. In order to form the joint 9 by engaging the protrusion 4 with the lower plate 1b, it is preferable to join the upper plate 1a and the lower plate 1b with the same thickness.
Although the procedure for joining two Mg alloy plates by clinching and caulking has been described, the present invention is not limited to two Mg alloy plates to be joined. Even when three or more Mg alloy plates are joined, clinching and caulking joining can be performed in the same procedure.

また、本発明は、ＪＩＳ規格AZ31，AZ61，AM60，AM80等のMgを90質量％以上含有するMg合金板のクリンチングカシメ接合に適用できる。   Further, the present invention can be applied to clinching and caulking joining of Mg alloy plates containing 90 mass% or more of Mg such as JIS standards AZ31, AZ61, AM60, and AM80.

図２(a)に示すようにパンチ２とダイス３を１組用いてクリンチングカシメ接合を行ない、２枚のMg合金板（ＪＩＳ規格AZ31）を、図１に示すように接合した。その手順について説明する。
使用したパンチ２の突起６の外径は４mm、ダイス３の凹部７の内径は６mmとし、上板1aと下板1bの厚さは、いずれも１mmとした。 As shown in FIG. 2 (a), clinching and caulking joining was performed using a pair of punch 2 and die 3, and two Mg alloy plates (JIS standard AZ31) were joined as shown in FIG. The procedure will be described.
The outer diameter of the projection 6 of the punch 2 used was 4 mm, the inner diameter of the recess 7 of the die 3 was 6 mm, and the thicknesses of the upper plate 1a and the lower plate 1b were both 1 mm.

これらの上板1aと下板1bを重ねて、図２(a)に示すように、パンチ２とダイス３で挟持し、パンチ２の下面21を上板1aの上面に当接させ、ダイス３の上面31を下板1bの下面に当接させた。
次に、パンチ２を押下するエアーシリンダー（図示せず）にエアー圧（0.3MPa）を付与しながら、パンチ２とダイス３に配設した電極（図示せず）から50Hzの単相交流電流を通電（通電時間10サイクル＝0.2秒，電流2.2kA）して、上板1aと下板1bを加熱した。このようにして上板1aと下板1bの接合位置を加熱して280℃に保持しながら、パンチ２を１回押下して、クリンチングカシメを行なった。これを発明例１として表１に示す。 As shown in FIG. 2 (a), the upper plate 1a and the lower plate 1b are overlapped and sandwiched between the punch 2 and the die 3, and the lower surface 21 of the punch 2 is brought into contact with the upper surface of the upper plate 1a. The upper surface 31 of this was brought into contact with the lower surface of the lower plate 1b.
Next, while applying air pressure (0.3 MPa) to an air cylinder (not shown) for pressing the punch 2, a single-phase alternating current of 50 Hz is applied from the electrodes (not shown) arranged on the punch 2 and the die 3. The upper plate 1a and the lower plate 1b were heated by energization (energization time 10 cycles = 0.2 seconds, current 2.2 kA). In this manner, the joining position of the upper plate 1a and the lower plate 1b was heated and held at 280 ° C., and the punch 2 was pressed once to perform clinching and caulking. This is shown in Table 1 as Invention Example 1.

表１に示す発明例２〜４は、Mg合金板の厚さを本発明の範囲内で変化させてクリンチングカシメを行なった例である。また、比較例１，２は、加熱温度が本発明の範囲を外れる例である。これらの例では、Mg合金板の厚さに応じてパンチ２とダイス３を選択し、加熱温度に応じて電流と通電時間を設定した。   Invention Examples 2 to 4 shown in Table 1 are examples in which clinching and caulking were performed by changing the thickness of the Mg alloy sheet within the scope of the present invention. Comparative Examples 1 and 2 are examples in which the heating temperature is outside the scope of the present invention. In these examples, the punch 2 and the die 3 were selected according to the thickness of the Mg alloy plate, and the current and energization time were set according to the heating temperature.

Figure 2013043184
Figure 2013043184

さらに接合位置を変更して、同様の手順でクリンチングカシメ接合を行なうことによって、図１に示すように、３ケ所に接合部９を設けた。
発明例１〜４では、いずれの接合部９も、接合不良や反りは認められず、十分な接合強さが得られた。また、接合部９の断面を調査したところ、図２(b)に示すように、上板1aに突出部４が形成され、かつその突出部４が下板1bと噛み合った状態で接合されており、良好な接合部が得られた。 Furthermore, by changing the joining position and performing clinching and caulking joining in the same procedure, joining parts 9 were provided at three places as shown in FIG.
In Invention Examples 1 to 4, no bonding failure or warpage was observed in any of the bonding portions 9, and sufficient bonding strength was obtained. Further, when the cross section of the joint portion 9 was examined, as shown in FIG. 2 (b), the protrusion 4 was formed on the upper plate 1a, and the protrusion 4 was joined with the lower plate 1b engaged. As a result, a good joint was obtained.

一方、比較例１，２では、上板1aに突出部４が十分に形成されず、その突出部４が下板1bと噛み合った状態も不完全であった。   On the other hand, in Comparative Examples 1 and 2, the protrusion 4 was not sufficiently formed on the upper plate 1a, and the state where the protrusion 4 meshed with the lower plate 1b was also incomplete.

1a 上板
1b 下板
２ パンチ
21 パンチの下面
３ ダイス
31 ダイスの上面
４ 突出部
５ ナゲット
６ 突起
７ 凹部
８ 溝
９ 接合部 1a Top plate
1b Lower plate 2 Punch
21 Bottom of the punch 3 Dice
31 Upper surface of die 4 Protruding part 5 Nugget 6 Protruding 7 Recessed part 8 Groove 9 Joint part

Claims (3)

Mg合金板を複数枚重ねて、該複数枚のMg合金板の接合位置を加熱し、一定の加熱温度に保持しながらMg合金板をパンチでダイス内に押し込むことによって前記Mg合金板を塑性変形させてクリンチングカシメを行なうことを特徴とするMg合金板のカシメ方法。   A plurality of Mg alloy plates are stacked, the joining position of the plurality of Mg alloy plates is heated, and the Mg alloy plate is plastically deformed by pressing the Mg alloy plate into a die with a punch while maintaining a constant heating temperature. A method for crimping an Mg alloy sheet, characterized by performing clinching and crimping. 前記Mg合金板の厚さを0.1〜４mmとし、前記加熱温度を250〜300℃とすることを特徴とする請求項１に記載のMg合金板のカシメ方法。   2. The method of caulking an Mg alloy plate according to claim 1, wherein the thickness of the Mg alloy plate is 0.1 to 4 mm, and the heating temperature is 250 to 300 ° C. 前記加熱を、ヒーターからの伝熱または電極からの通電によって行なうことを特徴とする請求項１または２に記載のMg合金板のカシメ方法。   The method of caulking an Mg alloy plate according to claim 1 or 2, wherein the heating is performed by heat transfer from a heater or energization from an electrode.
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