WO2018193706A1 - パネル部品用接合部の構造及び接合方法 - Google Patents
パネル部品用接合部の構造及び接合方法 Download PDFInfo
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- WO2018193706A1 WO2018193706A1 PCT/JP2018/005973 JP2018005973W WO2018193706A1 WO 2018193706 A1 WO2018193706 A1 WO 2018193706A1 JP 2018005973 W JP2018005973 W JP 2018005973W WO 2018193706 A1 WO2018193706 A1 WO 2018193706A1
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- panel
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- mastic adhesive
- mastic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
Definitions
- the present invention relates to a technique for bonding the back surface of a metal panel component such as an automotive panel component to a reinforcing component with a mastic adhesive.
- surface sinks local out-of-plane deformation of panel parts due to shrinkage of mastic adhesive
- the panel component is, for example, an outer plate component called an outer panel of an automobile or an inner plate component such as a floor or a dash lower.
- Such panel components are a group of components having a large projected area. And the contribution of the weight reduction by plate
- Such a panel component has, for example, a plate shape having a loose and wide curved surface, and the rigidity in the out-of-plane direction tends to be relatively low. For this reason, a reinforcing component that reinforces the panel component may be disposed on the back side. At this time, a mastic adhesive is interposed in the gap between the back surface of the panel component and the reinforcing component, and the panel component and the reinforcing component are joined with the mastic adhesive. Restrained by
- the mastic adhesive is a semi-solid material.
- This mastic adhesive when subjected to heat treatment such as baking heat for panel coating, is foamed (expanded) by the heat and then cured (shrinked) by subsequent cooling. have.
- the provided mastic adhesive has an important role in that when the panel component receives an external force, the mastic arrangement position becomes a support point for the external force, or the vibration of the panel component is suppressed.
- the panel part is a skin part exposed to the eyes of the user
- a high level is often required for the appearance quality of the surface.
- the surface rigidity of the panel component called tension stiffness decreases.
- the surface of a panel component may cause an out-of-plane deformation
- Such poor appearance due to out-of-plane deformation is generally referred to as surface sink, and is one of the problems in thinning the outer plate parts.
- Patent Document 1 discloses a method of reducing the shrinkage on the surface of the panel component by arranging two adhesives having different shrinkage rates in parallel. Further, Patent Document 2 discloses a method of suppressing surface sink by containing resin-made hollow particles in the mastic adhesive and absorbing the shrinkage of the mastic itself. Further, Patent Document 3 discloses a method capable of adjusting the strain generated by heat in the paint baking process by providing a structure capable of adjusting the distance between the outer panel and the reinforcing component.
- JP-A-6-73342 Japanese Patent No. 5707070 JP 2008-62696 A
- Patent Document 3 requires a complicated design of the internal parts, and every time the shape of the panel parts to be used and the relationship between the panel parts and the reinforcing parts change, a countermeasure part design is required. Therefore, the versatility is low as a countermeasure.
- the present invention has been made in view of the above points, and an object of the present invention is to suppress the occurrence of surface sink due to simply bonding panel components with a mastic adhesive.
- one aspect of the present invention provides a panel component for a mastic adhesive interposed when a reinforcing component and a back surface of a metal panel component facing each other with a gap are bonded to each other with a mastic adhesive.
- the outer peripheral contour shape of the adhesive surface to the back surface is formed by a continuous arc, and a cavity is formed at the center of the mastic adhesive.
- the contour shape formed by continuous arcs refers to a contour shape such as a circular shape or an elliptical shape in which there is no portion with a sharp curvature such as a corner in the middle.
- the stress applied to the surface of the panel component is reduced when the mastic adhesive contracts by devising the shape of the interposed mastic adhesive (panel component joint). I can do it.
- the mastic adhesive contracts by devising the shape of the interposed mastic adhesive (panel component joint). I can do it.
- it is possible to easily suppress the occurrence of surface sink due to bonding panel components with a mastic adhesive.
- FIG. 1 It is a figure which shows a hollow type mastic model, (a) is a perspective view, (b) is XX 'sectional drawing of (a). It is a figure which shows the donut shape type mastic model. It is a figure which shows the generation
- the structure of the joint part for panel parts of this embodiment is the structure of the joint part 3 that joins the reinforcing part 1 and the back surface 2a of the panel part 2 made of a metal plate with a space therebetween. And it is the structure of the junction part for panel components which consists of a mastic adhesive.
- the automotive panel parts such as the inner panel parts such as the floor and the dash lower, and the reinforcing parts.
- This technique is suitable for joining with a mastic adhesive.
- the structure of the joint part for panel parts of this embodiment is applicable even when panel parts for other uses are joined with a mastic adhesive.
- Such a panel component 2 is often formed in a plate shape having a curved surface with a loose and wide curvature, and the rigidity in the out-of-plane direction tends to be relatively low.
- the reinforcement component 1 which reinforces the panel component 2 is arrange
- a mastic adhesive is partially interposed in the gap, and with the mastic adhesive, The panel part 2 and the reinforcing part 1 are joined. And the panel component 2 is restrained by the reinforcement component 1 by the junction part 3 by the mastic adhesive.
- the shape (structure) of the joint portion 3 made of the mastic adhesive interposed between the panel component 2 and the reinforcing component 1 is set to a shape that satisfies the following two requirements. To do. (Requirement 1) The outer peripheral contour shape R1 of the adhesion surface 3A to the back surface 2a of the panel component 2 is formed by a continuous arc. (Requirement 2) A cavity 4 is formed at the center position of the joint 3 made of a mastic adhesive. Each requirement will be described.
- Requirement 1 is that the outer peripheral contour shape R1 of the surface (panel adhesive surface 3A) facing the back surface 2a of the panel component 2 in the joint structure made of a mastic adhesive is a sharp curvature portion as shown in FIG. This is achieved by setting a contour having a curved shape that does not have.
- the contour of the panel bonding surface 3A is set to a contour shape such as a circular shape or an elliptical shape made of a continuous arc shape.
- a curvature steep part is a part which a curvature changes suddenly, for example, forms a corner
- the outer peripheral contour shape R1 of the panel adhesive surface 3A is defined, but the outer peripheral contour shape of the adhesive surface 3B to the reinforcing component 1 in the mastic adhesive is also It is preferable to set the contour of a curved shape that does not have a sharply curved portion.
- the contour shape R1 of the panel adhesive surface 3A is constituted by a continuous arc shape.
- the contour shape R1 is a rectangular shape, the corners are locally pulled in when the contraction is contracted. This is because a different behavior can be considered. As a result, visual sensory confirmation may not be consistent with experimental results.
- the shape of the joint 3 made of a mastic adhesive is set to a cylindrical shape, a hemispherical shape, a truncated cone shape, a donut shape, or the like.
- the above requirement 1 can be satisfied by a simple shape of the joint portion 3.
- disconnected in the direction (direction parallel to the surface of a panel component) orthogonal to the line which goes to the reinforcement component 1 from the panel component 2 does not necessarily need to be the same size and the same shape.
- the shape of the mastic adhesive may be a donut shape as shown in FIG. 2 or may be a mountain shape whose cross section gradually decreases.
- FIG. 2 is an example in which the cavity 4 is opened to the panel component 2 side.
- the outer peripheral contour shape R1 of the panel bonding surface 3A in the shape of the joint portion 3 made of a mastic adhesive may be a dharma shape.
- the joint part which consists of two mastic adhesives stuck together and became dharma-like is exemplified assuming a structure having a substantially cylindrical shape (see FIG. 1) or a donut shape (see FIG. 2).
- Requirement 2 is to form a cavity 4 at the center position of the joint 3 made of an intervening mastic adhesive, as shown in FIGS.
- the center position may be the center position as viewed from the thickness direction of the panel component 2, that is, as viewed from the surface side of the panel component 2.
- the void ratio of the cavity 4 is more reliable than the case where the mastic adhesive is solid if it is 5% or more of the volume of the joint when the joint 3 made of mastic adhesive is solid. Demonstrate surface sink effect. More preferably, the void ratio is 10% or more.
- the above void ratio is the void ratio in the state after heating / cooling.
- the void ratio is preferably suppressed to less than 80%. More preferably, the upper limit of the void ratio is less than 60%.
- the cross-sectional shape of the cavity 4 is also a contour shape formed of a curved shape without a sharp curvature portion. Moreover, the cross-sectional shape of the cavity 4 is preferably similar to or similar to the cross-sectional shape of the joint 3 made of a mastic adhesive. Further, if the cavity ratio is the same, it is preferable that the formation position of the cavity 4 in the height direction is close to the panel component 2 side. This is because it is easier to relieve stress on the panel adhesive surface 3A.
- the cavity 4 is opened at least on the panel component 2 side where surface sink marks are likely to occur as shown in FIG.
- the contour R2 of the opening is also formed of a continuous arc (see FIG. 2).
- an opening may also be provided on the reinforcing component 1 side.
- the method of forming the joint portion 3 made of a mastic adhesive that satisfies the above two requirements is, for example, the opening shape of the tip of the filling nozzle for application used when applying the mastic adhesive to a component ( The part where the adhesive blows out is applied using a ring shape (O shape) or C shape.
- the joining process can be performed with the same tact time as in the prior art.
- the opening shape of the tip of the filling nozzle is C-shaped
- the C notch gap may be set so that the cross-section becomes a donut shape by expansion in the heating process.
- the cavity 4 inside the mastic adhesive for example, it is formed by inserting an injection needle into the mastic adhesive applied to a part in a predetermined amount and filling the inside with air or an inert gas. To do.
- the outer peripheral contour R1 of the panel bonding surface 3A has no corners. For this reason, generation
- the shape of the joint portion 3 made of a mastic adhesive the surface of the panel component 2 is loaded when the mastic adhesive contracts easily and without cost. To relieve stress. As a result, it becomes possible to suppress the occurrence of surface sink due to simply bonding the panel component 2 with the mastic adhesive.
- the joint portion 3 made of a hollow type mastic adhesive is employed rather than the joint portion 3 made of a solid type mastic adhesive.
- surface sink marks can be further suppressed. That is, the panel component 2 can be thinned when it is designed to have the same quality as the joint made of a solid type mastic adhesive.
- ⁇ Analysis conditions> As an analysis model, as shown in FIG. 3, a panel part model a simulating an outer panel having a rectangular shape with a side of 286 mm square projected and a convex shape on the upper side, a frame b supporting the panel, and an outer plate A model c simulating the reinforcing part 1 of the part was set.
- the panel component model a is supported in an upward curved curved surface shape.
- the panel part model “a” has a curved R5000 that assumes a roof panel of an automobile directed in one direction, and the surface shape in the direction orthogonal to the curved is set flat.
- a contour diagram of the displacement distribution in the z direction (the thickness direction of the panel component 2) of the panel component 2 in each case, with the plate thickness of the panel component model a being 0.50 mm, 0.60 mm, 0.70 mm, and 1.0 mm. was analyzed and output.
- the frame b was set to be a rigid body, and the material properties of the panel part model a, the model c of the reinforcing part 1 and the model d of the mastic adhesive were input as follows.
- models a and c assuming density of iron, a density of 7.8 g / cm 3 and a Young's modulus of 210 GPa were input, and for model d, a physical property value of the mastic adhesive was input.
- a thermoelastic FEM model is used as a physical property value of the mastic
- the thermal expansion coefficient during expansion is 0.850 ⁇ 10 ⁇ 3 / ° C. ⁇ m
- the Young's modulus is 150 MPa
- the thermal expansion coefficient during contraction is 0.905 ⁇ 10 ⁇ 3 / ° C. ⁇ m
- Young's modulus was 210 MPa.
- FIG. 5 the frame b and the panel part model a were divided into meshes, and the mastic adhesive model d was divided into solid elements as shown in FIG.
- the external shape of the mastic adhesive to be set was set to a cylinder having a diameter of 20 mm ⁇ .
- FIG. 6 is a solid type
- FIG. 7 is a hollow type
- FIG. 8 is a setting example of a donut shape type (a hollow shape opened up and down).
- the diameter of the cavity 4 was set to 5 mm, 10 mm, and 15 mm.
- the inner diameter is 5 mm ⁇ and the cavity ratio is 6%
- the inner diameter is 10 mm ⁇ and the cavity ratio is 25%
- the inner diameter is 15 mm ⁇ and the cavity ratio is 56%
- the cavity ratio is 2% when the inner diameter is 5 mm ⁇
- the cavity ratio is 8% when the inner diameter is 10 mm ⁇
- the cavity ratio is 19% when the inner diameter is 15 mm ⁇ .
- the solid element of the mastic adhesive was analyzed to increase the temperature from 20 ° C. to 170 ° C. and then decrease from 170 ° C. to 20 ° C. . Switching from temperature increase to temperature decrease was performed by a coupled analysis that inherited the panel shape and stress distribution.
- the evaluation of the surface sink was performed by calculating the distribution of the secondary differential value representing the change in the inclination of the surface from the Z displacement amount and the shape of the cross section of the adhesive part (panel center) of the mastic adhesive, and performing the maximum value. It is said that when the second derivative value increases, it becomes easier for humans to see, and it is determined that the larger the number, the greater the surface sink.
- FIG. 9 shows the result of the hollow type.
- the surface sink of the bonded portion of the mastic adhesive is reduced.
- FIG. 10 shows the results organized by the maximum second derivative value in the hollow type.
- the thickness of the joint 3 made of solid mastic adhesive is 0.70 mmt as a reference, if the void ratio is 5%, the plate thickness becomes equal to 0.60 mmt. Even if 2 is made thin, it is recognized that the same level of quality as the conventional solid type can be secured. Here, in the automobile, the panel component 2 having a thickness of about 0.70 mmt is often applied.
- FIG. 11 shows the result of a donut shape type (a hollow type opened up and down).
- the surface sink of the bonded portion of the mastic adhesive is reduced.
- FIG. 12 shows the results organized by the maximum second derivative value in the donut shape type.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Body Structure For Vehicles (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
- Laminated Bodies (AREA)
- Superstructure Of Vehicle (AREA)
Abstract
Description
このようなパネル部品は、例えば緩く広い曲面を持つ板形状となっていて、相対的に面外方向への剛性が低くなる傾向にある。このために、パネル部品を補強する補強部品が裏側に配置される場合がある。このとき、パネル部品の裏面と補強部品との間の隙間にマスチック接着剤を介在させ、当該マスチック接着剤で、パネル部品と補強部品との間を接合し、その接合によって、パネル部品は補強部品に拘束される。
また、特許文献2に記載の方法では、マスチック接着剤の材料とは別に、樹脂製球体を作製しマスチック接着剤に混合する必要がある。このため、特許文献2に記載の方法では、材料のコストアップに繋がる。また、特許文献2に記載の方法では、マスチック接着剤の材質と球体を構成する樹脂の物性バランスが変化すると、安定した効果が得られないため、混合の調整が難しくなるおそれがある。
本発明は、上記のような点に鑑みてなされたもので、簡便に、パネル部品をマスチック接着剤で接着することによる面ヒケの発生を抑えることを目的としている。
ここで、円弧の連続で形成される輪郭形状とは、円形状や楕円形状など、途中に角などの曲率が急峻する部分が存在しない輪郭形状を言う。
本実施形態のパネル部品用接合部の構造は、図1に示すように、間隔を開けて対向配置する補強部品1と金属板からなるパネル部品2の裏面2aとを接合する接合部3の構造であって、マスチック接着剤からなるパネル部品用接合部の構造である。
ここで、本実施形態は、自動車のアウターパネルと呼ばれる外板部品(ドアパネルやルーフパネルなど)や、フロアやダッシュロアなどの内板部品などの自動車用パネル部品と、補強部品との間を、マスチック接着剤による接合に好適な技術である。但し、本実施形態のパネル部品用接合部の構造は、他の用途のパネル部品をマスチック接着剤で接合する場合であっても適用可能である。
このとき、図1のように、パネル部品2の裏面2aと補強部品1との間に隙間が形成されるため、その隙間に対し部分的にマスチック接着剤を介在させ、当該マスチック接着剤で、パネル部品2と補強部品1との間を接合する。そして、そのマスチック接着剤による接合部3によって、パネル部品2は補強部品1に拘束される。
これに対し、本実施形態では、パネル部品2と補強部品1との間に介在させるマスチック接着剤からなる接合部3について、その形状(構造)を、次の2つの要件を満足する形状に設定する。
(要件1)パネル部品2の裏面2aへの接着面3Aの外周輪郭形状R1を、円弧の連続で形成する。
(要件2)マスチック接着剤からなる接合部3の中央部位置に、空洞4を形成する。
各要件について説明する。
要件1は、マスチック接着剤からなる接合部構造における、パネル部品2の裏面2aと対向する面(パネル接着面3A)の外周輪郭形状R1を、図1(b)のように、曲率急峻部を有しない曲線形状からなる輪郭に設定することで達成される。例えば連続する円弧形状からなる円形状や楕円形状などの輪郭形状にパネル接着面3Aの輪郭を設定する。尚、曲率急峻部とは、曲率が急に変化して、例えば角を形成する部分である。
ここで、パネル接着面3Aの輪郭形状R1を円弧形状の連続から構成させたのは、例えば輪郭形状R1が矩形形状の場合は、収縮した場合に角部の引込みが局所的に厳しくなり、実際とは異なる挙動を示すことが考えられるためである。その結果、目視による官能確認において、実験での結果と整合がつかないことがありうる。
なお、パネル部品2から補強部品1に向かう線に直交する方向(パネル部品の面と平行な方向)で切断した各横断面形状が、必ずしも同一寸法同一形状である必要はない。例えば、マスチック接着剤の形状は、図2に示すようなドーナツ形状であっても良いし、徐々に横断面が小さくなっていく山状の形状などであっても良い。図2は、空洞4が、パネル部品2側に開口した一例である。
以下、介在させるマスチック接着剤からなる接合部3の形状が略円柱形状(図1参照)やドーナツ形状(図2参照)の構造体を想定して例示する。
要件2は、図1や図2に示すように、介在させるマスチック接着剤からなる接合部3の中央部位置に空洞4を形成することである。上記の中央部位置は、パネル部品2の板厚方向からみた、つまりパネル部品2の表面側から見た、中央部位置とすればよい。
空洞4の空洞率は、介在させるマスチック接着剤からなる接合部3が中実の場合の当該接合部の体積の5%以上であれば、マスチック接着剤が中実の場合と比較して確実に面ヒケ抑制効果を発揮する。より好ましくは空洞率は10%以上である。
但し、空洞率が所定以上大きくなると、介在させたマスチック接着剤によるパネル部品2の振動抑制、張り剛性向上効果が低くなるため、空洞率は80%未満に抑えることが好ましい。より好ましくは空洞率の上限値は60%未満である。
また、同一空洞率であれば、空洞4の高さ方向の形成位置は、パネル部品2側に近づけて形成することが好ましい。その方が、パネル接着面3Aでの応力を緩和しやすいためである。
また、マスチック接着剤の内部に空洞4を形成する方法としては、例えば、部品に所定量塗布したマスチック接着剤に対し、注射針を刺して、内部に空気や不活性ガスを充填することで形成する。
本実施形態の形状を有するマスチック接着剤を採用した場合には、加熱されたマスチック接着剤が冷却によって収縮する際に、パネル接着面3Aではなく、主に空洞4の部分に変形が生じる。このため、パネル接着面3Aに発生する、パネル部品2を引き込む力が小さくなる。
このように、本実施形態では、マスチック接着剤からなる接合部3の形状を工夫することで、コストをかけずに且つ簡便に、マスチック接着剤が収縮する時に、パネル部品2の面に負荷される応力を緩和することが出来る。この結果、簡便に、パネル部品2をマスチック接着剤で接着することによる面ヒケの発生を抑制することが可能となる。
<解析条件>
解析モデルとして、図3に示すような、投影で一辺が286mm角の矩形形状で且つ上側に凸の曲面形状のアウターパネルを模擬したパネル部品モデルaと、これを支持する枠bと、外板部品の補強部品1を模擬したモデルcとを設定した。中央部に柱状のマスチック接着剤のモデルdを設けることで、パネル部品モデルaは上方に湾曲したかまぼこ状の曲面形状が支持される。
モデルa、cは、鉄を想定して密度7.8g/cm3且つヤング率210GPaを入力し、モデルdはマスチック接着剤の物性値を入力した。本実施例ではマスチックの物性値として、熱弾性のFEMモデルを使用し、膨張時の熱膨張係数を0.850×10-3 /℃・m、ヤング率を150MPa、収縮時の熱膨張係数を0.905×10-3 /℃・m、ヤング率を210MPaとした。
設定するマスチック接着剤の外形形状を、全て直径20mmφの円柱に設定した。ここで、図6は中実タイプを、図7は中空タイプを、図8はドーナツ形状タイプ(上下に開口した中空形状のタイプ)の設定例である。中空タイプ及びドーナツ形状タイプの場合には、空洞4の径として5mm、10mm及び15mmを設定した。
また、図7のような中空タイプの場合、内径5mmφで空洞率2%、内径10mmφで空洞率8%、内径15mmφで空洞率19%となる。
なお、解析は、ソルバーにLS-DYNA ver9.71を使用し、静的陰解法を用いて行った。
面ヒケの評価は、マスチック接着剤接着部(パネル中央)のZ変位量および横断面の形状から面の傾きの変化を表す二次微分値の分布を算出し、その最大値で行った。二次微分値が大きくなると人の目に見えやすくなるとされており、数字が大きい方が、面ヒケが大きいと判断される。
まず図9に中空タイプの結果を示す。
パネル部品2の板厚の増加により、マスチック接着剤の接着部の面ヒケが緩和するが、同じ板厚で比較すると、実施例で内径が大きいほど面ヒケは改善していることが分かる。
更に、図10に、中空タイプにおける最大二次微分値で整理した結果を示す。
図11にドーナツ形状タイプ(上下に開口した中空タイプ)の結果を示す。
パネル部品2の板厚の増加により、マスチック接着剤の接着部の面ヒケが緩和するが、同じ板厚で比較すると、実施例で内径が大きいほど面ヒケは改善していることが分かる。
さらに、図12に、ドーナツ形状タイプにおける最大二次微分値で整理した結果を示す。
以上のように、本発明によれば、パネル板厚を薄くしても現行の中実タイプのマスチック接着剤よりも面ヒケを抑制することが可能であり、車体の軽量化に寄与することが分かる。
ここでは、限られた数の実施形態を参照しながら説明したが、権利範囲はそれらに限定されるものではなく、上記の開示に基づく各実施形態の改変は当業者にとって自明なことである。
2 パネル部品
2a 裏面
3 接合部
3A パネル接着面
4 空洞
R1 外周輪郭形状
R2 開口の輪郭形状
Claims (5)
- 間隔を開けて対向する補強部品と金属製のパネル部品の裏面とを接合する、マスチック接着剤からなるパネル部品用接合部の構造であって、
上記パネル部品の裏面に接着する接着面の外周輪郭形状が、円弧の連続で形成され、
上記パネル部品の板厚方向からみて、上記マスチック接着剤からなるパネル部品用接合部の中央部位置に空洞が形成されていることを特徴とするパネル部品用接合部の構造。 - 上記空洞は上記裏面に接着する接着面に開口し、その開口の輪郭形状が円弧の連続で形成されていることを特徴とする請求項1に記載したパネル部品用接合部の構造。
- 上記空洞の体積は、上記マスチック接着剤からなるパネル部品用接合部を中実とした場合における当該接合部の体積の5%以上に設定したことを特徴とする請求項1又は請求項2に記載したパネル部品用接合部の構造。
- 上記パネル部品は、車両用パネル部品であることを特徴とする請求項1~請求項3のいずれか1項に記載したパネル部品用接合部の構造。
- 補強部品に対し金属製のパネル部品の裏面をマスチック接着剤で接着することで、マスチック接着剤によって上記補強部品にパネル部品を接合する接合方法であって、
上記補強部品と上記パネル部品との間に介在させるマスチック接着剤の形状を、上記パネル部品の裏面への接着面の外周輪郭形状を円弧の連続で形成されるように設定し、且つそのマスチック接着剤の中央部に空洞を形成したことを特徴とする接合方法。
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