JP6074900B2 - Metal plate and automotive body parts - Google Patents
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- JP6074900B2 JP6074900B2 JP2012070931A JP2012070931A JP6074900B2 JP 6074900 B2 JP6074900 B2 JP 6074900B2 JP 2012070931 A JP2012070931 A JP 2012070931A JP 2012070931 A JP2012070931 A JP 2012070931A JP 6074900 B2 JP6074900 B2 JP 6074900B2
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- 239000002184 metal Substances 0.000 title claims description 30
- 238000005452 bending Methods 0.000 description 18
- 238000004049 embossing Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Body Structure For Vehicles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
本発明は、板面内に複数の凸部が形成された金属板であって、剛性が必要とされる金属製のパネル類に適用され、特に自動車用のパネル部品に好適に使用できる金属板および自動車用ボディ部品に関する。 INDUSTRIAL APPLICABILITY The present invention is a metal plate having a plurality of projections formed in the plate surface, and is applied to metal panels that require rigidity, and can be used particularly suitably for automotive panel parts. And body parts for automobiles.
自動車の燃費を向上させるための手段の一つとして、自動車の車体を軽量化することが重要である。そのために、自動車を構成する骨格部品やパネル類に使われる材料は板厚が薄い材料が用いられるようになってきており、その結果部品の剛性が低下するという問題が発生している。特に、パネル類のように比較的平坦で広い面積を有する部品では、張り剛性や曲げ剛性などが著しく低下するため、自動車部品の品質が低下するという問題があった。 As one of the means for improving the fuel consumption of an automobile, it is important to reduce the weight of the automobile body. For this reason, materials used for frame parts and panels constituting automobiles have come to use thin materials, and as a result, there is a problem that the rigidity of the parts is lowered. In particular, parts such as panels that are relatively flat and have a large area have a problem in that the quality of automobile parts deteriorates because the tension rigidity and bending rigidity are significantly reduced.
薄板を使用した部品の剛性を向上させる技術として、板面にエンボスを施すなど、何らかの凹凸のパターンを付与する技術が開示されている。 As a technique for improving the rigidity of a component using a thin plate, a technique for providing some uneven pattern such as embossing on a plate surface is disclosed.
例えば、特許文献１には、胴体部に略菱形形状の凹凸を有する多面体壁を形成した金属缶が開示されている。これは缶の胴体部の剛性を高め、缶を持った際に発生する好ましくない変形を防止するためのものである。 For example, Patent Document 1 discloses a metal can in which a polyhedral wall having substantially rhombic irregularities is formed on a body portion. This is to increase the rigidity of the body portion of the can and prevent undesirable deformation that occurs when the can is held.
また、特許文献２には、エンボス加工によって形成された多数の正六角形または円形の凸部を板面内に有する自動車用ヒートインシュレータが開示されている。この発明では、凸部同士の間に存在する平坦部が直線状にならないように凸部を配置するとされている。 Patent Document 2 discloses a heat insulator for automobiles having a number of regular hexagonal or circular convex portions formed by embossing in the plate surface. In this invention, it is supposed that a convex part will be arrange | positioned so that the flat part which exists between convex parts may not become linear form.
さらに、特許文献３には、略半球状の凸部を板面内に複数有するヒートインシュレータが開示されている。この発明では、前記凸部の隙間を辿っていったときの軌跡が屈曲して表われるように設けられているとされている。 Furthermore, Patent Document 3 discloses a heat insulator having a plurality of substantially hemispherical convex portions in the plate surface. In this invention, it is said that it is provided so that the locus | trajectory when it traces the clearance gap between the said convex parts may bend and appear.
しかしながら、特許文献１に開示されている略菱形の凹凸は、隣り合う菱形の境界稜線が直線的に配列されているため、自動車用のパネルなどのように比較的平坦で面積の広いパネルに適用した場合には、稜線が直線状に並んでいるために、その稜線を起点に曲げ変形が発生しやすく、剛性があまり高くならないという問題がある。 However, the substantially rhombic irregularities disclosed in Patent Document 1 are applied to a relatively flat and large area panel such as a panel for an automobile because the boundary ridge lines of adjacent rhombuses are linearly arranged. In this case, since the ridge lines are arranged in a straight line, there is a problem that bending deformation is likely to occur from the ridge line and the rigidity is not so high.
また特許文献２に開示された技術は、凸部自体が正六角形または円形などの３軸以上の対象軸を有する形状の場合（例えば、後述する図６）、それらの凸部を板面内に規則正しく配置するために、完全に直線の平坦部が存在しなくとも、直線状に並んだ正六角形または円形で挟まれた平坦部は略直線状につながるために、その直線を起点に座屈が発生し易いという問題があった。 In addition, in the technique disclosed in Patent Document 2, in the case where the convex portion itself has a shape having three or more target axes such as a regular hexagon or a circular shape (for example, FIG. 6 described later), the convex portions are placed on the plate surface. In order to arrange them regularly, even if there are no completely straight flat parts, flat parts sandwiched between regular hexagons or circles that are arranged in a straight line are connected to each other in a straight line. There was a problem that it was likely to occur.
さらに、特許文献３に開示された技術は、大きさの異なる略半球状の凸部を板面内に配置するので、小さな直径の凸部と大きな直径の凸部の境界位置に広く平坦な部分が存在するため、その位置を起点に座屈が発生し易いという問題があった。また、直径の異なる半球を配置するため、直径に合わせて凸部の高さを決定すると、板面内に高さの異なる凸部が混在することになり、インシュレータ表面の凸部の高さが揃わず、製品表面が均一でなく、見た目の凹凸感につながるという問題があった。反対に直径の異なる半球の高さをそろえた場合には、プレス成形などによりインシュレータを加工する際に、直径の異なる凸部では成形時の伸び率が異なるため、板厚分布が均一になりにくく成形が安定せず形状不良になるという問題があった。 Furthermore, since the technique disclosed in Patent Document 3 arranges substantially hemispherical convex portions having different sizes in the plate surface, a wide flat portion is located at the boundary position between the small diameter convex portion and the large diameter convex portion. Therefore, there is a problem that buckling is likely to occur starting from the position. In addition, since hemispheres having different diameters are arranged, if the height of the convex portion is determined according to the diameter, convex portions having different heights are mixed in the plate surface, and the height of the convex portion on the insulator surface is reduced. There was a problem that the surface of the product was not uniform and the surface of the product was not uniform, leading to a sense of uneven appearance. On the other hand, when the height of hemispheres with different diameters is made uniform, when processing insulators by press molding, etc., the convex portions with different diameters have different elongation rates at the time of molding, so the plate thickness distribution is difficult to be uniform. There was a problem that the molding was not stable and the shape was poor.
本発明は、素材の板厚が薄い場合においても、板面内に凹凸を付与することにより、張り剛性や曲げ剛性などといったパネルの剛性を確実に向上させ安定した成形を可能とするための金属板、自動車用ボデイ部品および自動車部品を提供することを目的とする。 The present invention provides a metal for reliably improving the panel rigidity such as tension rigidity and bending rigidity by providing unevenness in the plate surface even when the plate thickness of the material is thin, thereby enabling stable molding. An object is to provide a board, an automobile body part and an automobile part.
本発明の要旨は以下の通りである。 The gist of the present invention is as follows.
第一の発明は、板面に複数の凸部が形成された金属板であって、前記凸部は、平面視略長方形または略楕円形を呈し且つ、前記金属板の一方の端部から他方の端部までの間で、前記金属板内の平坦部が連続した直線状を呈しないように、少なくとも一組の前記凸部の長辺部の向きを交差させた配列を形成させたことを特徴とする金属板である。 A first invention is a metal plate having a plurality of convex portions formed on a plate surface, wherein the convex portions have a substantially rectangular shape or a substantially oval shape in a plan view, and from one end portion of the metal plate to the other. In order to prevent the flat portion in the metal plate from forming a continuous linear shape, the arrangement in which the directions of the long side portions of the at least one set of the convex portions intersect is formed. It is a featured metal plate.
第二の発明は、第一の発明に記載の金属板を用いた自動車用ボディ部品である。 The second invention is a body part for an automobile using the metal plate described in the first invention.
第三の発明は、本体を構成する金属板に複数の凸部が形成された自動車用部品であって、前記凸部は平面視略長方形または略楕円形とし且つ、前記金属板の一方の端部から他方の端部までの間で、前記金属板内の平坦部が連続した直線状を呈しないように、少なくとも一組以上の前記凸部の長辺部の向きを交差させた配列を形成させたことを特徴とする自動車用部品である。 A third invention is an automotive part in which a plurality of convex portions are formed on a metal plate constituting a main body, wherein the convex portions are substantially rectangular or substantially elliptical in plan view, and one end of the metal plate An array in which the directions of the long side portions of at least one set of the convex portions intersect is formed so that the flat portion in the metal plate does not exhibit a continuous linear shape between the first portion and the other end portion. This is an automotive part characterized by the above.
本発明によれば、板厚を厚くすることなく成形後のパネルの剛性を向上させることができる。また、自動車用パネル部品などに適用した場合には、車体の軽量化と剛性の向上を両立することができ、車体軽量化による燃費改善効果が期待できる。また、自動車用骨格部品などに適用した場合には、曲げ強度に優れた部材となり、衝突安全特性の向上などが期待できる。 According to the present invention, the rigidity of the molded panel can be improved without increasing the plate thickness. In addition, when applied to automotive panel parts, it is possible to achieve both weight reduction and rigidity improvement of the vehicle body, and an improvement in fuel consumption can be expected by reducing the vehicle weight. In addition, when applied to automobile frame parts and the like, it becomes a member having excellent bending strength, and improvement of collision safety characteristics can be expected.
以下、本発明の金属板および自動車用ボディ部品について図を用いて説明する。 Hereinafter, the metal plate and automobile body part of the present invention will be described with reference to the drawings.
図１は本発明の一実施の形態に係る鋼板に付与する凸部の形状を平面視で略長方形または略楕円形とする図である。 FIG. 1 is a diagram illustrating a shape of a convex portion imparted to a steel plate according to an embodiment of the present invention as a substantially rectangular shape or a substantially oval shape in plan view.
略長方形の場合、凸部の断面形状は、図２に示したように屋根のような形状でも良く、平面視略楕円形の凸部の場合は、楕円球を半裁したような形状でもよい。断面形状や断面の高さは、素材の変形特性に応じて成形可能な範囲で決定すればよく、略長方形または略楕円形であれば、凸部を形成することにより、本発明の効果を得ることができる。 In the case of a substantially rectangular shape, the cross-sectional shape of the convex portion may be a roof-like shape as shown in FIG. 2, and in the case of a substantially elliptical convex portion in plan view, the shape may be a shape in which an elliptical sphere is cut in half. The cross-sectional shape and the height of the cross-section may be determined within a range that can be molded according to the deformation characteristics of the material. be able to.
本発明の特徴は、略長方形または略楕円形の長辺/短辺の比が同一の同じ形状の凸部を、図３に示すように互いに交差するように配置することである。図３の例は長辺／短辺の比率が１．５の場合であり、図４の例は長辺／短辺の比率を図４（ａ）は２．０、図４（ｂ）は３．０とした場合の配置例である。その一つの例を図５に示す。このように略長方形または略楕円形の一組以上の凸部の長辺部の向きを交差するように配列し、該配列した凸部によって、金属板の一方の端部から他方の端部までの間で、板面内の平坦部が連続した直線部を呈しないように配置することにより、金属板面上の全ての方向において、凸部に挟まれた平坦部が略直線状に繋がることがなく、直線上に必ず凸部の一部が存在するために、座屈しにくいパネルとすることができる。 A feature of the present invention is that convex portions having the same shape with the same long side / short side ratio, which are substantially rectangular or substantially oval, are arranged so as to intersect each other as shown in FIG. The example of FIG. 3 is the case where the ratio of the long side / short side is 1.5, and the example of FIG. 4 shows the ratio of the long side / short side as 2.0 in FIG. 4A and FIG. This is an arrangement example in the case of 3.0. One example is shown in FIG. In this way, it is arranged so that the directions of the long sides of one or more pairs of convex portions of a substantially rectangular shape or a substantially oval shape intersect, and from the one end portion of the metal plate to the other end portion by the arranged convex portions. By arranging so that the flat portion in the plate surface does not present a continuous straight portion, the flat portion sandwiched between the convex portions is connected in a substantially straight line in all directions on the metal plate surface. Since there is always a part of the convex portion on the straight line, it is possible to make a panel that is difficult to buckle.
大きさの異なる半球（凸部）を配置する従来技術（特許文献３等）に対し、本発明では、同じ形状の略長方形または略楕円形の凸部を規則正しく配置するため、板面内に座屈の起点となる平坦部が生成されることがないため、座屈しにくく剛性の高いパネルとすることができる。 In contrast to conventional techniques (such as Patent Document 3) in which hemispheres (projections) having different sizes are arranged, in the present invention, substantially rectangular or substantially elliptical convex parts having the same shape are regularly arranged. Since the flat part which becomes the starting point of bending is not produced | generated, it can be set as a panel which is hard to buckle and has high rigidity.
なお、直線状を呈する凸部の数は、最大でも５０個以内とすると良い。これを超えるとパネルが座屈しやすくて、凸部を付与する効果が小さくなるからである。 It should be noted that the number of convex portions exhibiting a linear shape is preferably 50 or less at the maximum. This is because if the thickness exceeds this range, the panel tends to buckle and the effect of imparting the convex portion becomes small.
本発明による金属板は、自動車用部品への適用が好適である。例えばボデイ部品等の自動車用パネルでは、前述の通り軽量化のため薄肉化の傾向があるとともに、素材板厚に対してパネルの面積が広いため、パネルの剛性や曲げ強度が低くなり品質不良や衝突特性の劣化が発生しやすいためである。 The metal plate according to the present invention is preferably applied to automobile parts. For example, automotive panels such as body parts tend to be thinner due to weight reduction as described above, and because the panel area is large relative to the thickness of the material, the panel rigidity and bending strength are reduced, resulting in poor quality and This is because the collision characteristics are likely to deteriorate.
自動車部品に適用する場合には、予めエンボス加工をした金属板を用いて、プレス加工などにより部品を製造してもよいし、平坦な金属板を素材として用い、自動車用部品を製造するプレス工程などの中で、金属板にエンボス形状を付与しながら自動車部品を製造しても良い。 When applied to automobile parts, a metal plate that has been embossed in advance may be used to produce the part by pressing, etc., or a flat metal plate may be used as a raw material to produce a car part. In such a case, an automobile part may be manufactured while giving an embossed shape to the metal plate.
本発明に係る金属板および自動車用ボディ部品の実施例として、寸法が０．７ｍｍ厚×３００ｍｍ幅×３００ｍｍ長さである引張強度２７０ＭＰａ級の冷延鋼板を用いて、本発明による略長方形のエンボスを施した鋼板を製作し、曲げ座屈強度を評価した。比較例として板面内に円形のエンボスを施した鋼板も併せて製作した。図７に示すように比較例の円形のエンボスは直径１３．８ｍｍ、高さ２ｍｍとし、本発明の略長方形のエンボスは長辺１５ｍｍ、短辺１０ｍｍの長方形とし、高さを２ｍｍとした。それぞれの平面視での面積がほぼ同じ程度になるように設定した。それぞれのエンボス形状の配列方法は図７に示すようにした。 As an example of a metal plate and an automobile body part according to the present invention, a cold rolled steel sheet having a tensile strength of 270 MPa class having dimensions of 0.7 mm thickness × 300 mm width × 300 mm length is used. The steel plate which gave was manufactured, and bending buckling strength was evaluated. As a comparative example, a steel plate with circular embossing in the plate surface was also produced. As shown in FIG. 7, the circular embossing of the comparative example had a diameter of 13.8 mm and a height of 2 mm, and the substantially rectangular embossing of the present invention was a rectangle having a long side of 15 mm and a short side of 10 mm, and the height was 2 mm. Each area in plan view was set to be approximately the same. Each embossed shape was arranged as shown in FIG.
図８では，エンボス加工をしていない平坦なパネル、比較例として円形のエンボスを付与したパネル、および本発明による略長方形のエンボスを付与したパネルを折り曲げるのに必要な曲げモーメントを比較した。グラフの縦軸は、エンボス加工をしていない平坦なパネルの曲げモーメント値を１として表したものである。曲げ方向は図７に示した方向とした。 In FIG. 8, the bending moment required to bend a flat panel not embossed, a panel provided with circular embossing as a comparative example, and a panel provided with a substantially rectangular embossing according to the present invention was compared. The vertical axis of the graph represents the bending moment value of a flat panel not embossed as 1. The bending direction was the direction shown in FIG.
比較例の円形エンボスの場合には、平坦な部分が略直線状に存在する部分があるため、エンボス形状の効果が十分に表れず、エンボス加工をしていない平坦なパネルに対し、１．４倍程度の向上効果に留まった。これに対し本発明では、金属板の一方の端部から他方の端部に至る平坦な部分に直線状を呈する部分がないため、エンボス形状が効果的に曲げ強度の向上に寄与しており、平坦なパネルに対し大幅に曲げ強度が改善された。 In the case of the circular embossing of the comparative example, since there is a portion where the flat portion is substantially linear, the effect of the embossing shape does not fully appear, and the flat panel not embossed is 1.4. The improvement effect was about double. On the other hand, in the present invention, since there is no portion that exhibits a linear shape in the flat portion from one end of the metal plate to the other end, the embossed shape contributes to the improvement of the bending strength effectively, Bending strength has been greatly improved for flat panels.
また、上記において、本発明例としてエンボス形状が長方形または楕円で、長辺１０〜５０ｍｍ、短辺５〜２５ｍｍ、長辺と短辺の比を１．２〜５．０、高さ０．５〜５ｍｍとし、板面内の平坦部における直線状をなす凸部の個数を２〜５０個とする場合（Ｎｏ．１〜６）、曲げ変形に必要なモーメントをエンボス無し（Ｎｏ．１０）を基準として比較した。表１にその結果を示す。 Moreover, in the above, as an example of the present invention, the embossed shape is a rectangle or an ellipse, the long side is 10 to 50 mm, the short side is 5 to 25 mm, the ratio of the long side to the short side is 1.2 to 5.0, and the height is 0.5. When the number of convex portions forming a straight line in the flat portion in the plate surface is 2 to 50 (No. 1 to 6), the moment required for bending deformation is not embossed (No. 10). Compared as a reference. Table 1 shows the results.
その結果、エンボス加工無し（Ｎｏ．１０）に較べて、Ｎｏ．１〜６の曲げモーメントは２．０〜３．５倍と良好な結果が得られた。直線状の凸部の個数が２の場合、すなわち、金属板全面に亘り、凸部の長辺部の向きが交差する一組の配列で直線を呈する部分が全くない場合が最も優れた曲げモーメントが得られたが、曲げモーメントを２．０倍まで許容できる場合は、図５に一例を図示するように、直線状の凸部の個数は５０個までとすることができる。 As a result, compared to no embossing (No. 10), No. Bending moments of 1 to 6 were 2.0 to 3.5 times and good results were obtained. The most excellent bending moment when the number of straight convex portions is 2, that is, when there is no straight portion in a set of arrangements where the long side portions of the convex portions cross over the entire surface of the metal plate However, when the bending moment can be allowed up to 2.0 times, the number of linear protrusions can be up to 50 as shown in FIG.
これらに対して、従来例としてエンボス形状を正方形、真円とした場合は、鋼板の一方の端部から対向する他方の端部まで直線が形成されたため、曲げ変形に必要なモーメントは、エンボス無しに比べて１．１〜１．４倍とわずかしか向上しなかった。また、エンボス形状を真円とし、直径が１２、１０、８ｍｍの３種類の大きさのエンボス形状を配置した場合には、直径の異なる境界位置に広く平坦な部分が存在し、その板面内の平坦部を起点として座屈が発生し、曲げ変形に必要なモーメントは、エンボス無しに比べて１．８倍と、本発明例の２．０倍以上に比べて低くとどまった。 On the other hand, when the embossed shape is a square or a perfect circle as a conventional example, a straight line is formed from one end of the steel plate to the other opposite end, so the moment required for bending deformation is not embossed Compared to 1.1 to 1.4 times, it was only slightly improved. In addition, when the embossed shape is a perfect circle and three types of embossed shapes with diameters of 12, 10 and 8 mm are arranged, there are wide and flat portions at the boundary positions with different diameters, and within the plate surface The buckling occurred starting from the flat portion of the material, and the moment required for bending deformation was 1.8 times that of the case without embossing, which was lower than 2.0 times that of the example of the present invention.
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