JP6039598B2 - Daboca method - Google Patents

Daboca method Download PDF

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JP6039598B2
JP6039598B2 JP2014040470A JP2014040470A JP6039598B2 JP 6039598 B2 JP6039598 B2 JP 6039598B2 JP 2014040470 A JP2014040470 A JP 2014040470A JP 2014040470 A JP2014040470 A JP 2014040470A JP 6039598 B2 JP6039598 B2 JP 6039598B2
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dowel
plate material
plate
side punch
hole
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JP2015165151A (en
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洋一 川嶋
洋一 川嶋
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NIKKOH METAL INDUSTRY CO., LTD.
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本発明は、接合しようとする板材間において板厚を同等の関係にできるなど、板厚に起因する制限を減らして汎用性を高めるようにし、また高い（強い）接合強度を得ることができるようにしたダボカシメ方法に関する。   In the present invention, it is possible to increase the versatility by reducing the limitation caused by the plate thickness, such as making the plate thickness equivalent between the plate materials to be bonded, and to obtain a high (strong) bonding strength. It is related to the method of making a dowel.

板材同士を接合する方法としては、一般に、スポット溶接やカシメなどが知られている。このうちスポット溶接は、重ねた板材を挟持させるように電極を圧着し給電する作業が基本になるが、溶接位置と電極との位置合わせが面倒であるうえに、溶接後処理、接合強度確認など種々の付随作業によって長いタクトタイムを要する。そのため、板材を製作するプレス工程等には組み込むことができずに、生産ラインの長大化や生産能率の低下などを招来する不都合がある。また接合強度の観点からは、強度不足や強度のバラツキが生じやすいといった事情もあった。   In general, spot welding, caulking, or the like is known as a method for joining plate members together. Of these, spot welding is basically the work of crimping and feeding the electrodes so that the stacked plate materials are sandwiched, but the positioning between the welding position and the electrodes is troublesome, post-welding processing, confirmation of bonding strength, etc. Long tact time is required due to various incidental operations. For this reason, it cannot be incorporated into a press process for producing a plate material, and there is a disadvantage in that the production line is lengthened and the production efficiency is lowered. In addition, from the viewpoint of bonding strength, there are circumstances such as insufficient strength and unevenness in strength.

一方、カシメによる接合方法には、板材の他にハトメやリベットといった接合部品を用いる方法をはじめとして、一方の板材にバーリングを形成して行うバーリングカシメやダボを形成して行うダボカシメなど、種々の方法が知られている。このうちバーリングカシメやダボカシメは、ハトメやリベットを必要としないために使用部品の点数を減らすことができる点で好適とされる（例えば、ダボカシメについては特許文献１等参照）。なかでもダボカシメは、バーリングカシメよりも接合強度が高くなる点、及びバーリングと違って板厚を貫通するような孔が形成されない点で好適とされることがある。   On the other hand, the joining method by caulking includes various methods such as a method of using joining parts such as eyelets and rivets in addition to the plate material, burring caulking performed by forming a burring on one plate material, and dowel crimping performed by forming a dowel. The method is known. Of these, burring caulking and dowel caulking are preferred because they do not require eyelets or rivets and can reduce the number of parts used (for example, refer to Patent Document 1 for dabo caulking). Among them, the dowel caulking may be preferable in that the bonding strength is higher than that of the burring caulking, and unlike the burring, a hole penetrating the plate thickness is not formed.

特開２００２−４５９３４号公報JP 2002-45934 A

ダボカシメを行うには、当然ながら一方の板材にダボ（中空の突起）を形成する必要がある。一般に、ダボを形成するには、元になる板材の板厚ｔを含めて１．５ｔ以内のダボ高さに抑えるのが、亀裂のないダボを形成させるための必要条件とされていた。すなわち、板材の表面からダボが突出する高さ（板厚ｔを除いた高さ）は板厚ｔの半分と同じか、これより小さい寸法に制限される。そのため、このダボを形成させた板材（以下、「ダボ
付き板材」と言う）に対し、ダボ孔を形成させる方の板材（以下、「ダボ孔付き板材」と言う）として同じ板厚のものを選択したとすると、ダボ孔からダボを突き抜けさせることができないことになる。 In order to perform dowel crimping, it is naturally necessary to form dowels (hollow protrusions) on one plate material. In general, in order to form a dowel, the dowel height within 1.5 t including the thickness t of the original plate material is a necessary condition for forming a dowel without cracks. That is, the height at which the dowels protrude from the surface of the plate material (the height excluding the plate thickness t) is limited to a dimension that is the same as or smaller than half the plate thickness t. Therefore, for the plate material on which this dowel is formed (hereinafter referred to as “plate material with dowels”), the plate material with the same thickness as the plate material on which dowel holes are formed (hereinafter referred to as “plate material with dowel holes”). If it is selected, the dowel cannot be penetrated from the dowel hole.

その結果として、ダボ孔付き板材は、ダボ付き板材のおおよそ半分以下の板厚のものに制限されることとなってしまい、それだけ汎用性が低くなる（ダボカシメの適用条件が厳しくなる）という問題があった。また、ダボ高さを十分に高くできないことがネックになるため、たとえダボ孔付き板材が薄い場合でも、接合強度に自ずと上限があるという問題があった。   As a result, the plate material with the dowel hole is limited to a plate thickness of about half or less than the plate material with the dowel plate, and the versatility is lowered accordingly (the application condition of the dowel caulking becomes severe). there were. In addition, since it is a bottleneck that the dowel height cannot be increased sufficiently, there is a problem that the bonding strength naturally has an upper limit even if the plate material with dowel holes is thin.

本発明は、上記事情に鑑みてなされたものであって、接合しようとする板材間において板厚を同等の関係にできるなど、板厚に起因する制限を減らして汎用性を高めるようにし、また高い（強い）接合強度を得ることができるようにしたダボカシメ方法を提供することを目的とする。   The present invention has been made in view of the above circumstances, and it is possible to increase the versatility by reducing restrictions due to the plate thickness, such as being able to make the plate thickness equivalent between the plate materials to be joined, It is an object of the present invention to provide a dowel-caulking method capable of obtaining a high (strong) bonding strength.

前記目的を達成するために、本発明は次の手段を講じた。
即ち、本発明に係るダボカシメ方法は、板厚方向に貫通するダボ孔が形成されたダボ孔付き板材とこのダボ孔付き板材の前記ダボ孔を突き抜けて突出する中空のダボが形成されたダボ付き板材とを準備し、前記ダボ付き板材では前記ダボの根本部内面に当該ダボ付き板材の板厚内に収まり且つ前記ダボの内径よりも径大となる開口端を有した段差状又はテーパ状の拡径部を形成しておき、前記ダボ孔付き板材と前記ダボ付き板材とを前記ダボ孔に前記ダボが嵌る状態にして重ね合わせ、前記ダボ付き板材に対しては前記ダボの内部へ前記拡径部の内周面と非接触を保持しつつ前記ダボの開口端を支持して立ち上がる末広がりのテーパ基部が形成された受け側パンチを挿入すると共に、前記ダボ孔付き板材に対しては前記ダボ孔を突き抜けて突出している前記ダボの先端部へ潰し側パンチを突き当て、前記受け側パンチと前記潰し側パンチとを対向押圧させることにより前記ダボの先端部を前記ダボ孔の開口周部で径方向外方へ押し広げて前記ダボ孔付き板材と前記ダボ付き板材とを接合することを特徴とする。 In order to achieve the above object, the present invention has taken the following measures.
That is, the dowel crimping method according to the present invention includes a dowel hole-formed plate material in which dowel holes penetrating in the plate thickness direction and a dowel hole in which a hollow dowel projecting through the dowel hole of the dowel hole-made plate material is formed. In the plate material with a dowel, a stepped or tapered shape having an open end that is within the thickness of the plate material with the dowel and is larger than the inner diameter of the dowel on the inner surface of the dowel . An enlarged diameter portion is formed, and the dowel holed plate material and the doweled plate material are overlapped with the dowel hole fitted into the dowel hole, and the doweled plate material is expanded into the dowel. It is inserted the receiving side punches inner peripheral surface and a divergent tapered base that rising supports the open end of the dowel while maintaining the non-contact is formed of diameter, relative to the dowel perforated plate Through the dowel hole The crushing side punch is abutted against the tip of the dowel, and the crushing side punch is pressed against the receiving side punch and the crushing side punch so that the tip of the dowel is radially outward at the opening peripheral part of the dowel hole. The plate material with dowel holes is joined to the plate material with dowel holes.

前記ダボ付き板材の板厚に対し、前記ダボ孔付き板材が同等以上の板厚を有したものとすることができる。
前記潰し側パンチのパンチ先端部に対し前記ダボよりも径小の突起を設けておき、前記受け側パンチと前記潰し側パンチとの対向押圧時に前記突起によるダボ先端部の径方向外方への押し広げを促進させるようにしてもよい。 The plate material with dowel holes may have a thickness equal to or greater than the plate thickness of the plate material with dowels.
A protrusion having a diameter smaller than that of the dowel is provided on the punch tip portion of the crushing side punch, and the dowel tip end portion of the dowel tip portion due to the protrusion is radially outward when the receiving side punch and the crushing side punch are pressed against each other. You may make it promote spreading.

前記ダボ孔付き板材における前記ダボ孔の開口周部に対し、前記ダボ孔から前記ダボが突き抜けた時の根本部を取り囲むように環状凹部を形成しておき、前記受け側パンチと前記潰し側パンチとの対向押圧時にダボ先端部の径方向外方への押し広げ部分を前記環状凹部内へ収容させるようにしてもよい。   An annular recess is formed so as to surround a base portion when the dowel penetrates from the dowel hole with respect to the opening peripheral portion of the dowel hole in the plate material with the dowel hole, and the receiving side punch and the crushing side punch A portion of the dowel tip extending outward in the radial direction may be accommodated in the annular recess when pressed against the annular recess.

本発明に係るダボカシメ方法は、接合しようとする板材間において板厚を同等の関係にできるものとなって板厚に起因する制限を減らして汎用性を高めることができ、また高い（強い）接合強度を得ることができる。   The dowel caulking method according to the present invention can make the plate thickness equivalent between the plate materials to be joined, and can reduce the restriction caused by the plate thickness to increase versatility, and can also achieve high (strong) joining. Strength can be obtained.

本発明に係るダボカシメ方法を説明した側断面図である。It is a sectional side view explaining the dowel caulking method according to the present invention. 本発明に係るダボカシメ方法の実施前状況を説明した側断面図である。It is a sectional side view explaining the situation before implementation of the dowel caulking method concerning the present invention. 本発明に係るダボカシメ方法の途中経過を説明した側断面図である。It is a sectional side view explaining the middle course of the dowel caulking method concerning the present invention. 本発明に係るダボカシメ方法の実施により構成された接合構造を示した側断面図である。It is the sectional side view which showed the joining structure comprised by implementation of the dowel caulking method which concerns on this invention. ダボ付き板材のダボに対して設ける拡径部を第２例とした場合の受け側パンチとの関係を示した側断面図である。It is the sectional side view which showed the relationship with the receiving side punch at the time of making the enlarged diameter part provided with respect to the dowel of a board | plate material with a dowel into a 2nd example. ダボ付き板材のダボに対して設ける拡径部を第３例とした場合の受け側パンチとの関係を示した側断面図である。It is the sectional side view which showed the relationship with the receiving side punch at the time of making the enlarged diameter part provided with respect to the dowel of a board | plate material with a dowel into a 3rd example.

以下、本発明の実施の形態を、図面に基づき説明する。
図１乃至図３は、本発明に係るダボカシメ方法を実施してダボ孔付き板材１とダボ付き板材２とを接合する状況を示しており、また図４は、このダボカシメ方法の実施により構成された接合構造を示している。本実施形態では、ダボ孔付き板材１の板厚ｔ1とダボ付き板材２の板厚ｔ2とを同じ寸法にする場合を例示してある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 to 3 show a state in which the dowel-caulking method according to the present invention is performed to join the dowel holed plate material 1 and the dowel-attached plate material 2, and FIG. 4 is configured by the implementation of the dowel-caulking method. FIG. In the present embodiment, it is illustrated the case where the thickness t 2 of the sheet thickness t 1 and the dowel with plate 2 dowel perforated plate 1 in the same dimension.

図２に示すように、ダボ孔付き板材１には、板厚方向に貫通するダボ孔５が形成されている。これに対してダボ付き板材２には中空のダボ６が形成されている。言うまでもなく、これらダボ孔５とダボ６とは、ダボ孔５（内径）に対してダボ６（外径）を嵌め入れることができる寸法関係としてある。
なお、ダボ孔付き板材１の板形状や用途、またダボ付き板材２の板形状や用途等は、特に限定されるものではない。例えば、ダボ孔付き板材１をベース材としてダボ付き板材２をベース材に取り付けるブラケットやフック等の小物類としたり、その反対に、ダボ付き板材２をベース材にしてダボ孔付き板材１を小物類としたりすることは、任意に選択可能である。また筐体等を製作する際などにあって、ダボ孔付き板材１とダボ付き板材２とのいずれもが、筐体の壁材や仕切材を形成するための要素（板状部品）とすることも、当然に可能である。 As shown in FIG. 2, dowel holes 5 penetrating in the plate thickness direction are formed in the plate material 1 with dowel holes. On the other hand, a hollow dowel 6 is formed in the plate material 2 with dowels. Needless to say, the dowel hole 5 and the dowel 6 have a dimensional relationship that allows the dowel 6 (outer diameter) to be fitted into the dowel hole 5 (inner diameter).
In addition, the plate shape and use of the plate material 1 with dowel holes and the plate shape and use of the plate material 2 with dowels are not particularly limited. For example, the dowel holed plate material 1 is used as a base material, and the doweled plate material 2 is attached to the base material, such as brackets and hooks. The classification can be arbitrarily selected. Further, when manufacturing a housing or the like, both the plate material 1 with dowel holes and the plate material 2 with dowels are elements (plate-like components) for forming the wall material and partition material of the housing. Of course, it is possible.

また、ダボ孔付き板材１の板厚ｔ1とダボ付き板材２の板厚ｔ2との寸法関係においても、同厚とすることが限定されるものではなく、多少の板厚差（例えば、１ｍｍ以内）を有する「同等」の範囲としたり、明らかに板厚が異なるもの（例えば、ｔ1＝０．５×ｔ2）としたりすることも可能である。更に、ダボ孔付き板材１やダボ付き板材２の材質についても、金属板であれば特に限定されるものではなく、加えて各板材１，２を同一材質としても異なる材質としてもよい。要するに、これら寸法的な要件や材質的な要件は、ダボ付き板材２に関して言えば中空のダボ６を形成でき、またそのダボ６をプレスで押し潰せるものであることで判断すればよい。 Also in the dimensional relationship between the thickness t 1 and the thickness t 2 of dowels with plate 2 dowel perforated plate 1, is not limited to be the same thickness, some of the plate thickness difference (e.g., It is also possible to make it an “equivalent” range having a thickness of 1 mm or less, or a plate thickness that is obviously different (for example, t 1 = 0.5 × t 2 ). Further, the material of the plate material 1 with dowel holes and the plate material 2 with dowels is not particularly limited as long as it is a metal plate. In addition, the plate materials 1 and 2 may be made of the same material or different materials. In short, these dimensional requirements and material requirements may be determined by the fact that a hollow dowel 6 can be formed with respect to the dowel-equipped plate member 2 and that the dowel 6 can be crushed by a press.

ダボ孔付き板材１には、ダボ孔５の開口周部に対してその開口をテーパ状に拡げた環状凹部７が形成されている。そのため、ダボ孔５に対してダボ付き板材２のダボ６を嵌め入れたとき、この環状凹部７がダボ孔５から突き抜けたダボ６の根本部を取り囲むようになる（図３参照）。
一方、ダボ付き板材２において、ダボ６のダボ高さｈ（板厚ｔ2を含んだ寸法）は、図３に示すように、このダボ６をダボ孔付き板材１のダボ孔５へ嵌め付けたときに、ダボ孔５を突き抜けて突出するダボ先端部の高さｍ（ｍ＝ｈ−ｔ2−ｔ1）が、おおよそダボ孔付き板材１の板厚ｔ1の半分以上となること（即ち、ｍ≧０．５×ｔ1）を目安として、形成されている。そのうえで、このダボ６には、その根本部内面に内径を拡大させた拡径部８が形成されている。 The dowel-holed plate member 1 is formed with an annular recess 7 in which the opening is expanded in a tapered shape with respect to the opening peripheral portion of the dowel hole 5. Therefore, when the dowel 6 of the dowel plate 2 is fitted into the dowel hole 5, the annular recess 7 surrounds the root of the dowel 6 protruding from the dowel hole 5 (see FIG. 3).
On the other hand, in the plate material 2 with dowels, the dowel height h (the dimension including the plate thickness t 2 ) of the dowel 6 is fitted into the dowel hole 5 of the plate material 1 with dowel holes as shown in FIG. The height m (m = h−t 2 −t 1 ) of the dowel tip protruding through the dowel hole 5 is approximately equal to or more than half the plate thickness t 1 of the plate material 1 with dowel holes ( That is, it is formed with m ≧ 0.5 × t 1 ) as a guide. In addition, the dowel 6 is formed with an enlarged diameter portion 8 having an inner diameter enlarged on the inner surface of the root portion.

この拡径部８は、ダボ６の内径よりも径大となる開口端を有したものとしてあり、例えば、開口端から板厚内（ダボ６）へ向かう方向で徐々に径小化させたテーパ部８ａを備える孔とすることができる。なお、この拡径部８の形成深さｄは、ダボ付き板材２の板厚ｔ2よりも小さくなるように抑えてある（ｔ2＞ｄ）。このようにすることで、ダボ６の根元部に対し、その全周を取り巻くようにして残肉部１０が形成される。この残肉部１０により、ダボ６の根元部に亀裂を発生させることなく、ダボ６の突出高さｈを可及的に大きくすることができる。 The enlarged diameter portion 8 has an opening end that is larger in diameter than the inner diameter of the dowel 6, for example, a taper that is gradually reduced in diameter in the direction from the opening end to the inside of the plate thickness (the dowel 6). It can be set as the hole provided with the part 8a. The formation depth d of the enlarged diameter portion 8, are suppressed to be smaller than the thickness t 2 of dowels with plate 2 (t 2> d). By doing in this way, with respect to the base part of the dowel 6, the remaining part 10 is formed so that the perimeter may be surrounded. By this remaining portion 10, the protrusion height h of the dowel 6 can be increased as much as possible without causing a crack in the root portion of the dowel 6.

このような拡径部８は、フライス盤やボール盤等を用いた切削加工により形成することもできるが、好ましくはダボ６の形成と並行して行うプレス加工により形成する。プレス加工を採用することで、残肉部１０を圧密化（圧縮による組成の緻密化）ができるので、その結果としてより一層、ダボ根元部の亀裂防止作用を得ることができる。なお、圧密化の作用を効果的に得るためには、ダボ６の形成後に拡径部８(テーパ部８ａ)の形成を行わせるようにするのが好適である。   Such a diameter-expanded portion 8 can be formed by cutting using a milling machine, a drilling machine, or the like, but is preferably formed by pressing performed in parallel with the formation of the dowel 6. By adopting the press working, the remaining portion 10 can be consolidated (composition densification by compression), and as a result, the crack prevention action of the dowel root can be further obtained. In order to effectively obtain the consolidation action, it is preferable to form the enlarged diameter portion 8 (tapered portion 8a) after the dowel 6 is formed.

これらダボ孔付き板材１とダボ付き板材２とを接合するためのダボカシメ方法では、受け側パンチ１２と潰し側パンチ１３とを備えたカシメ装置を用いる。
受け側パンチ１２はダボ６内へ挿入する突起形状を有して形成されたもので、ダイプレ
ート１４から突出する基部まわりには、末広がりのテーパ基部１５が形成されている。このテーパ基部１５は、ダボ６に設けられた拡径部８の内周面とは非接触を保持するものとなっている。ここにおいて「非接触を保持する」とは、ダボ６に対して受け側パンチ１２を挿入した時点（受け側パンチ１２と潰し側パンチ１３との対向押圧を行う前の段階）を言う。すなわち、テーパ部８ａを備える拡径部８の場合、この拡径部８の内周面と受け側パンチ１２のテーパ基部１５との周間には、菱形状の隙間が環状に連通した状態で形成されることになる。 In the dowel caulking method for joining the dowel holed plate material 1 and the doweled plate material 2, a caulking device including a receiving side punch 12 and a crushing side punch 13 is used.
The receiving side punch 12 is formed to have a protruding shape to be inserted into the dowel 6, and a tapered base portion 15 is formed around the base portion protruding from the die plate 14. The taper base portion 15 is not in contact with the inner peripheral surface of the enlarged diameter portion 8 provided in the dowel 6. Here, “holding non-contact” refers to a point in time when the receiving side punch 12 is inserted into the dowel 6 (a stage before the opposing pressing between the receiving side punch 12 and the crushing side punch 13 is performed). That is, in the case of the enlarged diameter portion 8 provided with the tapered portion 8a, a rhombus-shaped gap is communicated in an annular shape between the inner peripheral surface of the enlarged diameter portion 8 and the taper base portion 15 of the receiving side punch 12. Will be formed.

これに対し、潰し側パンチ１３は、ダボ孔５及びこのダボ孔５に嵌ったダボ６と同心配置となる円柱状に形成されたもので、ダボ６へ向けたパンチ先端部には、同じくダボ孔５及びダボ６と同心配置となる突起１６が設けられている。この突起１６は、ダボ６よりも径小となるように形成されたもので、本実施形態では、突出方向に徐々に径小となるテーパが付されたもの（円錐台形）としてある。   On the other hand, the crushing side punch 13 is formed in a columnar shape concentrically arranged with the dowel hole 5 and the dowel 6 fitted in the dowel hole 5. Protrusions 16 that are concentric with the holes 5 and dowels 6 are provided. The protrusion 16 is formed to have a diameter smaller than that of the dowel 6. In the present embodiment, the protrusion 16 has a tapered shape (conical trapezoidal shape) that gradually decreases in diameter in the protruding direction.

次に、これら受け側パンチ１２及び潰し側パンチ１３が備えられたカシメ装置を用いて、本発明に係るダボカシメ方法によりダボ孔付き板材１とダボ付き板材２とを接合する実施状況を説明する。
まず、図３に示すように、ダボ孔付き板材１とダボ付き板材２とを、ダボ孔５にダボ６が嵌る状態で重ね合わせる。そして、ダボ付き板材２のダボ６内へ受け側パンチ１２を挿入する。このとき、受け側パンチ１２のテーパ基部１５がダボ６の拡径部８内に収まり、ダイプレート１４がダボ付き板材２（ダボ６の下端部まわり）を支持した状態にする。 Next, the implementation situation which joins the board | plate material 1 with a dowel hole and the board | plate material 2 with a dowel hole by the dowel caulking method which concerns on this invention using the crimping apparatus provided with these receiving side punch 12 and the crushing side punch 13 is demonstrated.
First, as shown in FIG. 3, the plate material 1 with dowel holes and the plate material 2 with dowel holes are overlaid with the dowels 6 fitted in the dowel holes 5. And the receiving side punch 12 is inserted in the dowel 6 of the board | plate material 2 with a dowel. At this time, the taper base portion 15 of the receiving side punch 12 is accommodated in the enlarged diameter portion 8 of the dowel 6 so that the die plate 14 supports the plate material 2 with dowels (around the lower end portion of the dowel 6).

次に、ダボ孔付き板材１のダボ孔５を突き抜けて突出しているダボ６の先端部へ潰し側パンチ１３を突き当て、更に受け側パンチ１２と潰し側パンチ１３とを対向押圧させる。受け側パンチ１２を加圧側とするか潰し側パンチ１３を加圧側とするかはカシメ装置の仕様によるものであって、特に限定されるものではない。
この両パンチ１２，１３の対向押圧により、ダボ６の先端部が潰し側パンチ１３の突起１６によって軸方向（図３下方）に押圧される。従って、ダボ６においてダボ孔５から突出（露出）している周壁部分には、図１に示すように、押し潰しの負荷と同時にダボ孔５の開口周部で径方向外方へ拡がるように変形させる負荷（矢符Ｘ参照）が生じる。そのためダボ６は、その先端部が実際にダボ孔付き板材１の表面に沿う方向で拡径状に変形を起こすことになる。 Next, the crushing side punch 13 is abutted against the tip of the dowel 6 protruding through the dowel hole 5 of the dowel holed plate 1, and the receiving side punch 12 and the crushing side punch 13 are pressed against each other. Whether the receiving side punch 12 is the pressing side or the crushing side punch 13 is the pressing side depends on the specifications of the caulking device and is not particularly limited.
By the opposing pressing of both the punches 12 and 13, the tip of the dowel 6 is pressed in the axial direction (downward in FIG. 3) by the projection 16 of the crushing side punch 13. Accordingly, the peripheral wall portion of the dowel 6 protruding (exposed) from the dowel hole 5 is expanded radially outward at the opening periphery of the dowel hole 5 simultaneously with the crushing load as shown in FIG. A load to be deformed (see arrow X) is generated. Therefore, the tip of the dowel 6 is deformed in an enlarged diameter in the direction along the surface of the plate material 1 with the dowel hole.

潰し側パンチ１３には突起１６が設けられているために、ダボ６の先端部に拡径状の変形を起こさせる作用は促進される。殊に、本実施形態では、突起１６が突出方向に徐々に径小となるテーパ付き（円錐台形）とされているので、ダボ６の先端部に拡径状の変形を起こさせる作用は更に一層、強化される。
ダボ６は、突起１６による押圧部分が、この突起１６の形状に対応した凹み形状に変形されるが、この凹み変形部分の外周部は、潰し側パンチ１３において突起１６を取り囲んでいる円環状の平坦な先端面で押圧されて、押し返しによる***は抑えられることになる。そのため、ダボ６において拡径状の変形を起こした部分は、ダボ孔付き板材１の環状凹部７内を埋めるように収容されるようになり、ダボ孔付き板材１の表面にダボ６による凸部は生じず、ほぼフラットな状態に保持されることになる。 Since the protrusion 16 is provided on the crushing side punch 13, the action of causing the diameter-shaped deformation at the tip of the dowel 6 is promoted. In particular, in this embodiment, since the protrusion 16 is tapered (conical trapezoidal shape) whose diameter gradually decreases in the protruding direction, the effect of causing the diameter-shaped deformation at the tip of the dowel 6 is further increased. To be strengthened.
In the dowel 6, a pressing portion by the protrusion 16 is deformed into a concave shape corresponding to the shape of the protrusion 16, and the outer peripheral portion of the concave deformation portion is an annular shape surrounding the protrusion 16 in the crushing side punch 13. It is pressed by the flat tip surface, and the bulge caused by pushing back is suppressed. Therefore, the portion of the dowel 6 that has undergone a diameter-expanded deformation is accommodated so as to fill the annular recess 7 of the dowel-holed plate material 1, and the dowel-hole-formed plate member 1 has a convex portion formed on the surface thereof Will not occur and will be held in a substantially flat state.

一方、ダボ６の根元部では、潰し側パンチ１３の押圧に伴う軸方向の押圧力が残肉部１０を介してダボ付き板材２へと伝搬される。ダボ付き板材２は受け側パンチ１２のダイプレート１４によりバックアップされた状態にあるので、ダボ６の根元部でも、前記した周壁部と同様にやはり軸方向（図１の下方向き）に圧縮変形を受けることになる。
ここにおいて、ダボ付き板材２の拡径部８と受け側パンチ１２のテーパ基部１５との周間には環状の隙間が形成されていることから、ダボ６の根元部はこの隙間内へ向けた（縮径方向へ向けた）変形が許容される状況にある。そのため、この変形を起こそうとする作用が、ダボ６の根元部に負荷する軸方向圧縮力を緩和し、且つダボ６の径方向外方へ負荷を円滑に逃がすように作用する（矢符Ｙの円弧カーブ参照）。実質的に、ダボ６の根元部が隙間内へ向けて変形し、受け側パンチ１２のテーパ基部１５へ接触干渉するようになれば、ダボ６の径方向外方へ負荷を逃がす作用は、より一層高くなる。 On the other hand, in the root portion of the dowel 6, the axial pressing force accompanying the pressing of the crushing side punch 13 is transmitted to the plate material 2 with the dowel through the remaining portion 10. Since the dowel-equipped plate member 2 is backed up by the die plate 14 of the receiving punch 12, the base portion of the dowel 6 is also compressed and deformed in the axial direction (downward in FIG. 1) similarly to the peripheral wall portion described above. Will receive.
Here, since an annular gap is formed between the enlarged diameter portion 8 of the doweled plate member 2 and the taper base portion 15 of the receiving punch 12, the root portion of the dowel 6 is directed into this gap. It is in a situation where deformation (toward the diameter reduction direction) is allowed. Therefore, the action of causing the deformation acts to relieve the axial compressive force applied to the root portion of the dowel 6 and to smoothly release the load radially outward of the dowel 6 (arrow Y Arc curve). If the root portion of the dowel 6 is substantially deformed into the gap and interferes with the taper base portion 15 of the receiving punch 12, the action of releasing the load radially outward of the dowel 6 is more It gets even higher.

要するに、潰し側パンチ１３の押圧に伴う軸方向の押圧力がダボ６の根元部をダイプレート１４へ直線的に押し付けて圧縮させるといった過激な作用の発生は回避されることになる。そのため、残肉部１０では応力集中が起こり難くなり、結果としてこの残肉部１０で亀裂等が発生することはない。
このようにして、図４に示すように、ダボ孔付き板材１とダボ付き板材２とが確実に、且つ高い（強い）接合強度で接合されるものとなる。 In short, the occurrence of an extreme action in which the axial pressing force accompanying the pressing of the crushing side punch 13 linearly presses and compresses the root of the dowel 6 against the die plate 14 is avoided. Therefore, stress concentration hardly occurs in the remaining portion 10, and as a result, no crack or the like occurs in the remaining portion 10.
In this way, as shown in FIG. 4, the plate material 1 with dowel holes and the plate material 2 with dowels are reliably bonded with high (strong) bonding strength.

なお、本発明に係るダボカシメ方法では、スポット溶接などとは異なってタクトタイムを短縮することができるので、ダボ孔付き板材１やダボ付き板材２を製造するための順送プレスやタレパン（タレットパンチプレス）の中の１工程として本発明に係るダボカシメ方法による接合工程を組み込むようにすることもできる。
ところで、本発明は、前記実施形態に限定されるものではなく、実施の形態に応じて適宜変更可能である。 In the dowel crimping method according to the present invention, the tact time can be shortened unlike spot welding or the like, and therefore, a progressive press or a turret punch (turret punch for producing the dowel plate 1 or dowel plate 2 is provided. It is also possible to incorporate a joining step by the dowel crimping method according to the present invention as one step in the press.
By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.

例えば、環状凹部７は、テーパ状とすることが限定されるものではなく、段差状の凹み（深さ方向がストレートの内周面を備えた凹み）として形成してもよい。また、環状凹部７は省略して、ダボ６の先端部がダボ孔付き板材１の表面で径方向外方へ拡がるように押し潰す構造にしてもよい。
図５に示すように、ダボ付き板材２のダボ６に対して設ける拡径部８のテーパ部８ａと、受け側パンチ１２の基部まわりに設けるテーパ基部１５とを接近させて形成することも可能である。この場合には、拡径部８のテーパ部８ａに付与するテーパ角αよりも、受け側パンチ１２のテーパ基部１５に付与するテーパ角βのほうが小さくなる関係にすることで、拡径部８とテーパ基部１５との間を非接触に保持させる（隙間を生じさせる）ことができる。 For example, the annular recess 7 is not limited to a tapered shape, and may be formed as a step-shaped recess (a recess having a straight inner peripheral surface in the depth direction). Alternatively, the annular recess 7 may be omitted, and the tip of the dowel 6 may be crushed so as to expand outward in the radial direction on the surface of the plate material 1 with dowel holes.
As shown in FIG. 5, the taper portion 8 a of the enlarged diameter portion 8 provided on the dowel 6 of the dowel plate 2 and the taper base portion 15 provided around the base portion of the receiving punch 12 can be formed close to each other. It is. In this case, the diameter-enlarged portion 8 can be obtained by making the taper angle β imparted to the taper base 15 of the receiving punch 12 smaller than the taper angle α imparted to the taper portion 8 a of the diameter-enlarged portion 8. And the taper base portion 15 can be held in a non-contact manner (a gap is created).

図６に示すように、ダボ付き板材２のダボ６に対して設ける拡径部８は、ダボ付き板材２の板厚内に段差を生じさせた段付き孔とすることもできる。この場合、この拡径部８の内周面と受け側パンチ１２のテーパ基部１５との周間には、逆三角形状の隙間が環状に連通した状態で形成されることになる。   As shown in FIG. 6, the enlarged diameter portion 8 provided for the dowel 6 of the doweled plate member 2 may be a stepped hole in which a step is generated in the plate thickness of the doweled plate member 2. In this case, an inverted triangular gap is formed between the inner peripheral surface of the enlarged diameter portion 8 and the taper base portion 15 of the receiving punch 12 in an annularly communicating state.

１ ダボ孔付き板材
２ ダボ付き板材
５ ダボ孔
６ ダボ
７ 環状凹部
８ 拡径部
１０ 残肉部
１２ 受け側パンチ
１３ 潰し側パンチ
１４ ダイプレート
１５ テーパ基部 DESCRIPTION OF SYMBOLS 1 Plate material with dowel hole 2 Plate material with dowel hole 5 Dowel hole 6 Dowel 7 Annular recessed part 8 Wide diameter part 10 Remaining part 12 Receiving side punch 13 Crushing side punch 14 Die plate 15 Taper base

Claims (4)

板厚方向に貫通するダボ孔が形成されたダボ孔付き板材とこのダボ孔付き板材の前記ダボ孔を突き抜けて突出する中空のダボが形成されたダボ付き板材とを準備し、
前記ダボ付き板材では前記ダボの根本部内面に当該ダボ付き板材の板厚内に収まり且つ前記ダボの内径よりも径大となる開口端を有した段差状又はテーパ状の拡径部を形成しておき、
前記ダボ孔付き板材と前記ダボ付き板材とを前記ダボ孔に前記ダボが嵌る状態にして重ね合わせ、
前記ダボ付き板材に対しては前記ダボの内部へ前記拡径部の内周面と非接触を保持しつつ前記ダボの開口端を支持して立ち上がる末広がりのテーパ基部が形成された受け側パンチを挿入すると共に、
前記ダボ孔付き板材に対しては前記ダボ孔を突き抜けて突出している前記ダボの先端部へ潰し側パンチを突き当て、
前記受け側パンチと前記潰し側パンチとを対向押圧させることにより前記ダボの先端部を前記ダボ孔の開口周部で径方向外方へ押し広げて前記ダボ孔付き板材と前記ダボ付き板材とを接合する
ことを特徴とするダボカシメ方法。 Preparing a dowel holed plate material in which dowel holes penetrating in the plate thickness direction are formed and a dowel plate material in which a hollow dowel protruding through the dowel hole of the dowel hole plate material is formed;
Wherein the dowel with the plate material to form a stepped or tapered expanded diameter section base portion inner surface falls within the thickness of the dowel with the plate material and having an open end serving as a diameter larger than the inner diameter of the dowel of the dowels Leave
The dowel holed plate material and the doweled plate material are overlapped with the dowel hole fitted into the dowel hole,
Receiving For the dowel with plate members diverging tapered base that rising supports the open end of the dowel while maintaining the inner peripheral surface and the non-contact of the expanded diameter portion into the interior of the dowel is formed While inserting the side punch,
With respect to the plate material with the dowel hole, the crushed side punch is abutted against the tip of the dowel protruding through the dowel hole,
The receiving side punch and the crushing side punch are pressed against each other so that the tip end portion of the dowel is expanded radially outward at the opening peripheral portion of the dowel hole, and the dowel holed plate material and the doweled plate material are formed. A dowel caulking method characterized by joining. 前記ダボ付き板材の板厚に対し前記ダボ孔付き板材が同等以上の板厚を有していることを特徴とする請求項１記載のダボカシメ方法。   2. The dowel crimping method according to claim 1, wherein the dowel holed plate material has a plate thickness equal to or greater than a plate thickness of the doweled plate material. 前記潰し側パンチのパンチ先端部に対し前記ダボよりも径小の突起を設けておき、前記受け側パンチと前記潰し側パンチとの対向押圧時に前記突起によるダボ先端部の径方向外方への押し広げを促進させることを特徴とする請求項１又は請求項２記載のダボカシメ方法。   A protrusion having a diameter smaller than that of the dowel is provided on the punch tip portion of the crushing side punch, and the dowel tip end portion of the dowel tip portion due to the protrusion is radially outward when the receiving side punch and the crushing side punch are pressed against each other. 3. The method of claim 1 or claim 2, wherein the spreading is promoted. 前記ダボ孔付き板材における前記ダボ孔の開口周部に対し、前記ダボ孔から前記ダボが突き抜けた時の根本部を取り囲むように環状凹部を形成しておき、前記受け側パンチと前記潰し側パンチとの対向押圧時にダボ先端部の径方向外方への押し広げ部分を前記環状凹部内へ収容させることを特徴とする請求項１乃至請求項３のいずれか１項に記載のダボカシメ方法。   An annular recess is formed so as to surround a base portion when the dowel penetrates from the dowel hole with respect to the opening peripheral portion of the dowel hole in the plate material with the dowel hole, and the receiving side punch and the crushing side punch The dowel crimping method according to any one of claims 1 to 3, wherein a portion of the tip of the dowel extending outward in the radial direction is accommodated in the annular recess at the time of opposing pressing.
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