JP3625494B2

JP3625494B2 - Metal plate joining structure and joining method

Info

Publication number: JP3625494B2
Application number: JP16645794A
Authority: JP
Inventors: 晃加藤
Original assignee: Sanyo Machine Works Ltd
Current assignee: Sanyo Machine Works Ltd
Priority date: 1994-07-19
Filing date: 1994-07-19
Publication date: 2005-03-02
Anticipated expiration: 2020-03-02
Also published as: JPH0824967A

Description

【０００１】
【産業上の利用分野】
本発明は、金属製板材を導通状態で接合する金属製板材の接合構造及び接合方法に関する。
【０００２】
【従来の技術】
従来より、家電製品の筐体の組立（例えば箱状に形成される外枠端部の接合）や自動車の板金構造部における接合には、用途に応じ多種多用の金属製板材の接合構造あるいは接合方法が提案され使用されている。
【０００３】
例えば、電子レンジやオーブン等の調理機器（３０）の加熱用内箱（３１）（図３（Ａ）参照）は、開口部（３２ａ）を有する前板（３２）と角筒状の胴部（３３）及び後板（３４）とから構成され（図３（Ｂ）参照）、前板（３２）と胴部（３３）とは、図４に示すように、接合箇所の断面構造が逆「Ω」字形状となるように絞り出しかしめ加工されて接合される（特公昭６０−１８２５９号公報、特公昭６１−１３８８９号公報、特開昭６２−２４４５３３号公報参照）。
【０００４】
その一方、接合箇所（６０）に電気的導通性を持たせたものとして、一方の金属製板材（６１）の一部（６１ａ）（図５（Ａ）参照）を絶縁性塗膜（６８）と共に切断しながら他方の金属製板材（６２）に上述した絞り出しかしめ加工を施すことにより電気的導通部（６３）（図５（Ｂ）参照）を形成する電子レンジ用の加熱箱も提案されている（特開平１−１０７０１７号公報）。
【０００５】
【発明が解決しようとする課題】
しかるに、図４に示す接合構造（方法）では、接合すべき前板（３２）と胴部（３３）を絶縁性塗膜を有するＰＣＭ材で構成した場合、両者の間に絶縁性塗膜が介在するため、電気的に絶縁されることなる。このような絶縁現象が、例えば上述した電子レンジの内箱を構成する金属製板材間に生じると、外部への電波漏れという問題が生じるため、当該箇所の絶縁性塗膜を剥離する等の特別な対策が必要となる。
【０００６】
このような絶縁性塗膜による絶縁を防止するため、上述した電気的導通部を形成する加熱箱（特開平１−１０７０１７号公報参照）が提案されたが、この板材の接合構造（方法）によると、図５（Ａ）（Ｂ）に示すように、切断箇所（６１ａ）が露出するため、当該切断箇所（６１ａ）から金属製板材（６１）が酸化して錆（鉄製の場合は二酸化鉄）が発生するという新たな課題が生じる。この絶縁性塗膜の剥離を防止するためにマスキング加工を施すと加工費用が大きくなる。
【０００７】
本発明は、このような経緯に鑑みて提案されたもので、板材同士を確実に接合すると共にＰＣＭ材等の表面被膜（絶縁性塗膜）を有する板材同士でも両者間の電気的導通が得られる金属製板材の接合構造及び接合方法を提供することを目的としている。
【０００８】
【課題を解決するための手段】
前述した目的達成のため、本発明の金属製板材の接合方法は、第１の金属製板材に小穴が形成され、かつ、第２の金属製板材の接合面に絶縁性塗膜が形成された２枚の金属製板材を、前記小穴の位置で両金属製板材を絞り出しかしめ加工するに際し、第２の金属製板材の絶縁性塗膜を小穴の端部で切断しつつ、第２の金属製板材の一部が小穴に嵌入され、小穴に嵌入した第２の金属製板材の部分と小穴の内壁面とを金属接触させることを特徴としている。
【０００９】
このような方法によって接合された２枚の金属製板材は、第１の金属製板材に小穴が形成され、かつ、第２の金属製板材の接合面に絶縁性塗膜が形成された２枚の金属製板材が、前記小穴の位置で絞り出しかしめ状態にあり、第２の金属製板材の一部が小穴の端部で絶縁性塗膜を切断されて小穴に一体的に嵌入され、小穴に嵌入した第２の金属製板材の部分と小穴の内壁面とを金属接触させている構造を特徴としている。
【００１０】
【作用】
雄型治具と雌型治具の間に２枚の金属製板材を配置して絞り出しかしめ加工を施すと、雄型治具により２枚の金属製板材が雌型治具のダイス穴内に絞り込まれ、さらに、両金属製板材の突出部分の端部が雄型治具の先端面と上記ダイス穴の底面との間で強圧されて据え込まれる。その結果、上記突出部分の端部の材料が横方向に展延して両金属製板材が相互にかしめられる。
【００１１】
このとき、小穴が形成されていない方の金属製板材の上記突出部分の端部における材料が、他方の金属製板材の小穴に押し出されて嵌入する。
【００１２】
この嵌入過程で、少なくともいずれか一方の金属製板材の接合面に形成された絶縁性塗膜は切断され、そのまま小穴の非接合側面まで押し出される。また、小穴内に嵌入した一方の金属製板材の部分と小穴の内壁面とが金属接触し、電気的導通が得られる。
【００１３】
その結果、２枚の金属製板材は共に雌型治具のダイス穴に沿って膨出した状態でしっくりと結合され、しかも電気的に導通状態となる。
【００１４】
【実施例】
次に、本発明の第１実施例である金属製板材の接合方法を図１を参照しながら説明する。
【００１５】
概略すると本実施例は、小穴（２）が形成された第１の金属製板材（１）に第２の金属製板材（７）を重ね合わて絞り出しかしめ加工を施すことにより、両者を接合すると共に、第１の金属製板材（１）の小穴（２）内に第２の金属製板材（７）の一部を嵌入させて両金属製板材（１），（７）を電気的に導通させるようにしたものである。
【００１６】
図１（Ａ）は接合前の金属製板材（１），（７）の断面形状を示し、図１（Ｂ）は一体構造に接合された第１の金属製板材（１）及び第２の金属製板材（７）の断面形状を示す。
【００１７】
本実施例で使用する第１の金属製板材（１）は、従来例と同様に電子レンジ等の調理機器（３０）の加熱用内箱（３１）の前板等に適用されるもので、図１（Ａ）に示されるように、一定間隔ごとに小穴（２）が穿設されている。
【００１８】
第２の金属製板材（７）は、同様に加熱用内箱（３１）の胴部等に適用されるもので、図１（Ａ）に示されるように、第１の金属製板材（１）と接合される表面に絶縁性塗膜（８）が形成されている。
【００１９】
また、第１の金属製板材（１）を支持する雌型治具（１０）は第１の金属製板材（１）の小穴（２）の内径よりも大径の凹部すなわちダイス穴（１１）を有する。ダイス穴（１１）は、弾性的に拡径可能に支持された分壁部（１０ａ）の内壁面と、アンビル（１０ｂ）の上面とで構成される。一方、雄型治具（１５）は雌型治具（１０）のダイス穴（１１）の内径よりも小径の凸部（１６）を有している。
【００２０】
第１の金属製板材（１）と第２の金属製板材（７）の接合に際しては、雌型治具（１０）で第１の金属製板材（１）を小穴（２）が中心位置にくるように支持し、雄型治具（１５）で図１（Ａ）に示すように荷重（Ｐ）をかける。
【００２１】
荷重（Ｐ）の負荷によって、第１および第２の金属製板材（１），（７）が雄型治具（１５）の凸部（１６）に沿うようにして雌型治具（１０）のダイス穴（１１）内に絞り込まれる。
【００２２】
雄型治具（１５）がさらに降下すると、ダイス穴（１１）内に膨出した部分が雄型治具（１５）とアンビル（１０ｂ）の間で据え込まれて横方向に展延する。このとき、雌型治具（１０）の分壁部（１０ａ）が図１（Ａ）中矢印Ｄで示されるように、拡径して材料の横方向への展延を許容する。
【００２３】
この据え込み作用の際の材料の塑性流動により、第２の金属製板材（７）の一部が第１の金属製板材（１）の小穴（２）内に押し出される。これに伴い、第２の金属製板材（７）の絶縁性塗膜（８）が小穴（２）の端部（２ａ）で切断され、小穴（２）に嵌入した第２の金属製板材（７）の部分と小穴（２）の内壁面との間は金属接触となり、電気的導通が得られる。
【００２４】
かかる方法によって結合された第１及び第２の金属製板材（１），（７）は、図１（Ｂ）に示すように、小穴（２）において導電状態で下端部が膨出した状態で、しっくりと一体化された状態となるため、第１の金属製板材（１）と第２の金属製板材（７）との間にいかなる方向のズレも発生せず実用上十分な強度を持った接合構造が得られる。
【００２５】
次に、本発明の第２実施例である金属製板材の接合方法を図２を参照しながら説明する。
【００２６】
この方法は、絶縁性塗膜（２８）が第１及び第２の金属製板材（２１），（２７）の各両面に形成されている場合の接合方法であり、接合に際して使用される雌型治具（１０）及び雄型治具（１５）並びに小穴（２）の構成等は第１実施例と同様であるので図１に付した符号と同一符号を付して作用及び効果の説明を簡略にする。
【００２７】
本実施例も第１実施例と同様に、重ねあわせた第１および第２の金属製板材（２１），（２７）を雌型治具（１０）で支持し、雄型治具（１５）で荷重（Ｐ）をかけて絞り出しかしめ加工を施すことにより第１の金属製板材（２１）と第２の金属製板材（２７）を接合する。
【００２８】
本実施例によれば、接合直前に小穴（２）に対面していた第２の金属製板材（２７）の絶縁性塗膜（２８）が、小穴（２）で切断されて押し出され第１の金属製板材（２１）の非連結側表面（２１ａ）の絶縁性塗膜（２８）と面一となる。
【００２９】
したがって、本方法によって結合された第１及び第２の金属製板材（２１），（２７）は、図２（Ｂ）に示すような形態を呈し、第１実施例によって接合された場合と同様に電気的導通性を備える強固な結合構造が得られる上に、第１の金属製板材（２１）の小穴（２）を第２の金属製板材（２７）の絶縁性塗膜（２８）で被覆して隠蔽する作用を奏し耐錆性に優れる。そのため、ＰＣＭ材同士の接合にも好適である。
【００３０】
なお、小穴（２）を第１の金属製板材（１），（２１）ではなく第２の金属製板材（７），（２７）に形成し、上述した各実施例における雌型治具（１０）と雄型治具（１５）の配置を上下反対にしてもよい。また、第１の金属製板材（１），（２１）の絞出穴（２）の平面形状をほぼ円形状（図示せず）に構成したが、これに限られず三角形状あるいは四角形状に構成してもよい。さらに、この発明は、電子レンジの等の加熱用内箱の接合のみならず、自動車の板金構造部等各種接合に適用できる。
【００３１】
【発明の効果】
以上説明したように、本発明によれば、絞り出しかしめ加工で接合すべき２枚の金属製板材のいずれか一方の金属製板材に予め小穴を形成しておくことにより、金属製板材の接合面に絶縁性塗膜が形成されている場合であっても、強固な結合が得られ、同時に防錆性及び両金属製板材間の電気的導通性も達成できる。
【００３２】
とくに、一方の金属製板材に小穴を形成しておくだけでよく、他方の金属製板材には突起や切起し、穴等を形成する必要がないため、通常使用される雌型治具と雄型治具で絞り出しかしめ加工を施すだけで容易かつ迅速に接合できる。しかも、電気的導通を確保した接合構造が実現する。
【００３３】
したがって、製品の寸法精度が向上するとともに電波漏れも防止でき、調理機器の加熱用内箱等の組立工数の節減に対しても顕著な効果が発揮される。
【図面の簡単な説明】
【図１】第１実施例によって接合する前の各金属製板材の構造を示す断面図（Ａ）及び接合した後の各金属製板材の構造を示す断面図（Ｂ）である。
【図２】第２実施例によって接合する前の各金属製板材の構造を示す断面図（Ａ）及び接合した後の各金属製板材の構造を示す断面図（Ｂ）である。
【図３】電子レンジ又はオーブンの全体構造を示す斜視図（Ａ）及び前板と胴部との接合状態を説明する斜視図（Ｂ）である。
【図４】従来技術の第１例を示す拡大断面図である。
【図５】従来技術の第２例を示す拡大斜視図（Ａ）及び（Ａ）のＶ−Ｖ線断面図（Ｂ）である。
【符号の説明】
１，７，２１，２７金属製板材
２小穴
８，２８絶縁性塗膜[0001]
[Industrial application fields]
The present invention relates to a metal plate material joining structure and a joining method for joining metal plate materials in a conductive state.
[0002]
[Prior art]
Conventionally, assembling of housings for home appliances (for example, joining of edge portions of outer frames formed in a box shape) or joining at the sheet metal structure part of an automobile, various metal plate joining structures or joining depending on applications A method has been proposed and used.
[0003]
For example, a heating inner box (31) (see FIG. 3 (A)) of a cooking device (30) such as a microwave oven or an oven has a front plate (32) having an opening (32a) and a rectangular tubular body. (33) and the rear plate (34) (see FIG. 3 (B)), the front plate (32) and the body portion (33) are reverse in cross-sectional structure at the joint as shown in FIG. They are squeezed and joined so as to form an “Ω” shape (see Japanese Patent Publication Nos. 60-18259, 61-13889, and 62-244533).
[0004]
On the other hand, a part (61a) (see FIG. 5 (A)) of one metal plate (61) is treated as an insulating coating film (68), assuming that the joint (60) has electrical conductivity. A heating box for a microwave oven is also proposed in which the other metal plate material (62) is subjected to the above-described squeezing and squeezing process to form an electrically conductive portion (63) (see FIG. 5B). (Japanese Patent Laid-Open No. 1-1007017).
[0005]
[Problems to be solved by the invention]
However, the joint structure shown in FIG. 4 (method), if the front plate to be joined (32) and body portion (33) is constituted by PCM material having an insulating coating film, both the insulating coating film during the Because they are interposed, they are electrically insulated. Such insulation phenomenon, for example, occurs between the metal plate constituting the inner box of the above-mentioned microwave oven, since the problem of radio wave leakage to the outside occurs, special like peeling the insulating coating of the location Measures are required.
[0006]
In order to prevent insulation by such an insulating coating film, a heating box (see Japanese Patent Laid-Open No. 1-1007017) for forming the above-described electrically conductive portion has been proposed, but depending on the joining structure (method) of this plate material 5 (A) and 5 (B), since the cut portion (61a) is exposed, the metal plate material (61) is oxidized from the cut portion (61a) to rust (in the case of iron, iron dioxide). ) Occurs. If a masking process is performed in order to prevent peeling of the insulating coating film, the processing cost increases.
[0007]
The present invention has been proposed in view of such circumstances, and it is possible to obtain electrical continuity between the plate materials even when the plate materials have a surface coating ( insulating coating ) such as a PCM material while being securely joined together. It is an object of the present invention to provide a joining structure and joining method for metal plate materials.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, the metal plate material joining method of the present invention has a small hole formed in the first metal plate material and an insulating coating film formed on the joint surface of the second metal plate material . When the two metal plate materials are squeezed and squeezed out at the position of the small hole, the second metal plate material is cut while the insulating coating film of the second metal plate material is cut at the end of the small hole . some of the plate is fitted into the small hole, a second portion and the inner wall surface of the eyelet of the metal plate which is fitted into the small hole is metallic contact is characterized in Rukoto.
[0009]
The two metal plate members joined by such a method are two sheets in which small holes are formed in the first metal plate member and an insulating coating film is formed on the joint surface of the second metal plate member. metal plate is in the caulking state squeezed in position of the eyelet, is integrally fitted to a portion of the second metallic plate material eyelets are cut insulating coating at the end of the eyelet, the eyelet It is characterized by a structure in which the portion of the inserted second metal plate and the inner wall surface of the small hole are in metal contact .
[0010]
[Action]
When two metal plates are placed between the male jig and the female jig and squeezed and squeezed, the two metal plates are drawn into the die hole of the female jig by the male jig. In addition, the ends of the protruding portions of the two metal plate members are installed with a strong pressure between the tip surface of the male jig and the bottom surface of the die hole. As a result, the material at the end of the protruding portion extends in the lateral direction, and the two metal plate materials are caulked together.
[0011]
At this time, the material at the end portion of the protruding portion of the metal plate member on which the small hole is not formed is pushed out and inserted into the small hole of the other metal plate member.
[0012]
In this insertion process, the insulating coating film formed on the joining surface of at least one of the metal plate members is cut and extruded as it is to the non-joining side surface of the small hole. Moreover, the metal plate part and the inner wall surface of a small hole which are inserted in the small hole are in metal contact, and electrical conduction is obtained.
[0013]
As a result, the two metal plate members are joined together in a state where they bulge along the die hole of the female jig, and become electrically conductive.
[0014]
【Example】
Next, a metal plate joining method according to the first embodiment of the present invention will be described with reference to FIG.
[0015]
In summary, in this embodiment, the second metal plate material (7) is overlapped on the first metal plate material (1) in which the small holes (2) are formed, and the two metal plates (7) are squeezed and squeezed to join them together. A part of the second metal plate (7) is inserted into the small hole (2) of the first metal plate (1) to electrically connect the two metal plates (1) and (7). It is what I did.
[0016]
FIG. 1A shows a cross-sectional shape of the metal plate materials (1) and (7) before joining, and FIG. 1B shows the first metal plate material (1) and the second metal plate material joined in a unitary structure. The cross-sectional shape of a metal plate material (7) is shown.
[0017]
The first metal plate material (1) used in this example is applied to the front plate of the heating inner box (31) of the cooking appliance (30) such as a microwave oven as in the conventional example, As shown in FIG. 1A, small holes (2) are formed at regular intervals.
[0018]
The second metal plate (7) is similarly applied to the body of the heating inner box (31) and the like, and as shown in FIG. 1 (A), the first metal plate (1 ) Is formed on the surface to be joined.
[0019]
The female jig (10) for supporting the first metal plate (1) has a recess having a diameter larger than the inner diameter of the small hole (2) of the first metal plate (1), that is, a die hole (11). Have The die hole (11) includes an inner wall surface of the dividing wall portion (10a) supported so as to be elastically expandable and an upper surface of the anvil (10b). On the other hand, the male jig (15) has a convex portion (16) having a smaller diameter than the inner diameter of the die hole (11) of the female jig (10).
[0020]
At the time of joining the first metal plate (1) and the second metal plate (7), the small hole (2) is centered on the first metal plate (1) with the female jig (10). As shown in FIG. 1A, a load (P) is applied by the male jig (15).
[0021]
The female jig (10) is arranged so that the first and second metal plate members (1), (7) are along the convex portion (16) of the male jig (15) by the load (P). The die hole (11) is narrowed down.
[0022]
When the male jig (15) is further lowered, the portion swelled in the die hole (11) is placed between the male jig (15) and the anvil (10b) and extends laterally. At this time, the dividing wall portion (10a) of the female jig (10) is expanded in diameter as shown by an arrow D in FIG. 1 (A) to allow the material to spread in the lateral direction.
[0023]
Due to the plastic flow of the material during this upsetting action, a part of the second metal plate (7) is pushed into the small hole (2) of the first metal plate (1). Accordingly, the insulating coating (8) of the second metal plate (7) is cut at the end (2a) of the small hole (2), and the second metal plate ( 7) and the inner wall surface of the small hole (2) are in metal contact, and electrical conduction is obtained.
[0024]
As shown in FIG. 1 (B), the first and second metal plate members (1) and (7) joined by such a method are in a conductive state in the small hole (2) in a state where the lower end portion bulges. Because it is in an integrated state, it does not cause any misalignment between the first metal plate (1) and the second metal plate (7), and has sufficient strength for practical use. Can be obtained.
[0025]
Next, a metal plate joining method according to a second embodiment of the present invention will be described with reference to FIG.
[0026]
This method is a joining method in the case where the insulating coating film (28) is formed on both surfaces of the first and second metal plate materials (21) and (27). Since the configurations of the jig (10), the male jig (15), and the small hole (2) are the same as those in the first embodiment, the same reference numerals as those in FIG. Keep it simple.
[0027]
Similarly to the first embodiment, the first and second metal plate materials (21) and (27) are supported by the female jig (10) in this embodiment, and the male jig (15). The first metal plate (21) and the second metal plate (27) are joined by applying a load (P) and performing squeezing and constricting.
[0028]
According to the present embodiment, the insulating coating film (28) of the second metal plate (27) facing the small hole (2) immediately before joining is cut and extruded through the small hole (2). It becomes flush with the insulating coating (28) on the non-connecting side surface (21a) of the metal plate (21).
[0029]
Accordingly, the first and second metal plate members (21) and (27) joined by this method have a form as shown in FIG. 2 (B), and are the same as the case of being joined by the first embodiment. In addition, a strong coupling structure having electrical conductivity can be obtained, and the small holes (2) of the first metal plate (21) can be formed by the insulating coating (28) of the second metal plate (27). Covers and conceals and has excellent rust resistance. Therefore, it is also suitable for joining PCM materials.
[0030]
A small hole (2) is formed in the second metal plate (7), (27) instead of the first metal plate (1), (21), and the female jig ( 10) and the male jig (15) may be arranged upside down. Moreover, although the planar shape of the squeezing hole (2) of the first metal plate members (1) and (21) is substantially circular (not shown), it is not limited to this and is configured to be triangular or square. May be. Furthermore, the present invention can be applied not only to the joining of heating inner boxes such as microwave ovens, but also to various joinings such as automobile sheet metal structures.
[0031]
【The invention's effect】
As described above, according to the present invention, by forming a small hole in advance in one of the two metal plate members to be joined by squeezing and squeezing, the joint surface of the metal plate member is formed. Even when an insulating coating film is formed on the surface, strong bonding can be obtained, and at the same time, rust prevention and electrical continuity between both metal plate materials can be achieved.
[0032]
In particular, it is only necessary to form a small hole in one metal plate material, and it is not necessary to form protrusions, cuts, holes or the like in the other metal plate material. It can be easily and quickly joined by simply squeezing or squeezing with a male jig. Moreover, a junction structure that ensures electrical continuity is realized.
[0033]
Therefore, the dimensional accuracy of the product can be improved and the leakage of radio waves can be prevented, and a remarkable effect can be achieved for the reduction in the number of assembly steps such as the heating inner box of the cooking appliance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view (A) showing the structure of each metal plate before joining according to the first embodiment and a cross-sectional view (B) showing the structure of each metal plate after joining.
FIG. 2 is a cross-sectional view (A) showing the structure of each metal plate before joining according to the second embodiment, and a cross-sectional view (B) showing the structure of each metal plate after joining.
FIG. 3 is a perspective view (A) showing an entire structure of a microwave oven or an oven, and a perspective view (B) for explaining a joined state between a front plate and a body portion.
FIG. 4 is an enlarged cross-sectional view showing a first example of the prior art.
FIG. 5 is an enlarged perspective view (A) and a cross-sectional view taken along line VV of (A) showing a second example of the prior art.
[Explanation of symbols]
1, 7, 21, 27 Metal plate 2 Small hole 8, 28 Insulating coating

Claims

Two metal plate materials in which small holes are formed in the first metal plate material and an insulating coating film is formed on the joint surface of the second metal plate material, and both metal plate materials are disposed at the positions of the small holes. upon caulking squeezed, while the insulating coating of the second metal plate is cut at the end of the small hole, a second metal part of the second metal plate is fitted in the small hole and fitted into the eyelet joining method of metal plate material and a part and the inner wall surface of the eyelet of manufacturing sheet material, characterized in Rukoto to metal contact.

Two metal plate materials in which a small hole is formed in the first metal plate material and an insulating coating is formed on the joint surface of the second metal plate material are squeezed out at the position of the small hole . A part of the second metal plate material is cut at the end of the small hole, and the insulating coating is cut into the small hole . The second metal plate member and the inner wall surface of the small hole are inserted into the small hole. A metal plate joining structure, wherein the metal plates are in metal contact .