JP6340896B2 - Steel member for center pillar - Google Patents

Steel member for center pillar Download PDF

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JP6340896B2
JP6340896B2 JP2014090700A JP2014090700A JP6340896B2 JP 6340896 B2 JP6340896 B2 JP 6340896B2 JP 2014090700 A JP2014090700 A JP 2014090700A JP 2014090700 A JP2014090700 A JP 2014090700A JP 6340896 B2 JP6340896 B2 JP 6340896B2
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side wall
yield strength
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steel
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俊太郎 松山
俊太郎 松山
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Nippon Steel Corp
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Description

本発明は、センターピラー用鋼部材に関する。   The present invention relates to a steel member for a center pillar.

燃費向上のために自動車等の車両は軽量化が求められる一方で、搭乗者の安全確保の観点から衝突安全性が求められている。軽量化を実現するには、車両の車体を構成する鋼部材の薄肉化が有効である。しかしながら、単に鋼部材を薄肉化しただけでは、衝突時の安全性を確保できない。そこで、鋼部材を構成する鋼板の高強度化や、鋼部材に補強部材を追加することが検討されている。   Vehicles such as automobiles are required to be lighter in order to improve fuel efficiency, while collision safety is required from the viewpoint of ensuring passenger safety. In order to reduce the weight, it is effective to reduce the thickness of the steel member that forms the vehicle body of the vehicle. However, the safety at the time of a collision cannot be ensured only by thinning the steel member. Therefore, it has been studied to increase the strength of the steel plate constituting the steel member and to add a reinforcing member to the steel member.

より具体的には、車両がその側面から衝突を受けた場合には、センターピラーに衝突荷重が加わる可能性がある。衝突時のセンターピラーの変形量が小さければ、搭乗者の安全性が確保される。そこで、センターピラーの対衝突変形量を小さくすることが検討されている。   More specifically, when the vehicle receives a collision from the side, a collision load may be applied to the center pillar. If the deformation amount of the center pillar at the time of collision is small, the safety of the passenger is ensured. Therefore, it has been studied to reduce the deformation amount of the center pillar against collision.

特許文献１には、外側骨格部材、内側骨格部材、補強用骨格部材からなる自動車センターピラーが開示されている。補強用骨格部材は、内側骨格部材に向けて突出する突出部と、外側骨格部材に沿って内側骨格部材に沿って延びる端補強壁部とを有している。   Patent Document 1 discloses an automobile center pillar including an outer skeleton member, an inner skeleton member, and a reinforcing skeleton member. The reinforcing skeleton member includes a protruding portion that protrudes toward the inner skeleton member, and an end reinforcing wall portion that extends along the inner skeleton member along the outer skeleton member.

また、特許文献２には、リーンフォースメントパネルと、センターピラーインナーパネルと、一方及び他方のリーンフォースメントよりなるセンターピラーが開示されている。２つのリーンフォースメントはセンターピラーを補強するものとされている。   Patent Document 2 discloses a center pillar including a reinforcement panel, a center pillar inner panel, and one and the other reinforcement. The two reinforcements are supposed to reinforce the center pillar.

特開２００８−２３０４５３号公報JP 2008-230453 A 特開２００９−２９２３６７号公報JP 2009-292367 A

しかしながら、上記特許文献１、２に記載された技術は、補強部材の追加による重量増が避けられない。よって特許文献１、２に記載の技術では、衝突安全性を確保できたとしても、燃費向上を目的とした軽量化は望めず、軽量化と衝突安全性の両立が困難であった。   However, the techniques described in Patent Documents 1 and 2 cannot avoid an increase in weight due to the addition of a reinforcing member. Therefore, with the techniques described in Patent Documents 1 and 2, even if collision safety can be ensured, weight reduction for the purpose of improving fuel efficiency cannot be expected, and it is difficult to achieve both weight reduction and collision safety.

本発明は上記事情に鑑みてなされたものであって、燃費向上のための軽量化と衝突安全性の両立を可能とするセンターピラー用鋼部材の提供を課題とする。   This invention is made | formed in view of the said situation, Comprising: It aims at provision of the steel member for center pillars which enables coexistence of the weight reduction for a fuel consumption improvement, and collision safety.

［１］ 車両の外側に向けて配置されるアウター部と、前記アウター部の幅方向両側に接続される一対の側壁面部と、前記一対の側壁面部に接続されるとともに前記アウター部に対向して車両の内側に配置されるインナー部とを備え、
前記アウター部、前記側壁面部及び前記インナー部が鋼板から構成され、
前記アウター部における前記鋼板の降伏強度と板厚の３乗との積が、前記側壁面部及び前記インナー部における前記鋼板の降伏強度と板厚の３乗との積よりも高く、
前記側壁面部における前記鋼板の降伏強度と板厚の３乗との積と、前記インナー部における前記鋼板の降伏強度と板厚の３乗との積が等しい、ことを特徴とするセンターピラー用鋼部材。
［２］ 前記アウター部が鋼板で構成され、
前記一対の側壁面部及び前記インナー部が前記鋼板とは別の鋼板を成形加工した成形部材で構成され、
前記アウター部をなす前記鋼板の降伏強度と板厚の３乗との積が、前記成形部材をなす前記別の鋼板の降伏強度と板厚の３乗との積より高いことを特徴とする請求項１に記載のセンターピラー用鋼部材。
［３］ 前記一対の側壁面部および前記アウター部が鋼板を成形加工した成形部材で構成され、
前記アウター部の降伏強度が焼き入れによって前記側壁面部の降伏強度より高くされていることを特徴とする請求項１に記載のセンターピラー用鋼部材。 [1] An outer part disposed toward the outside of the vehicle, a pair of side wall surface parts connected to both sides in the width direction of the outer part, and connected to the pair of side wall surface parts and facing the outer part An inner portion disposed inside the vehicle,
The outer part, the side wall surface part and the inner part are made of a steel plate,
The product of the cube of the yield strength and sheet thickness of the steel plate at the outer portion, rather higher than the product of the cube of the yield strength and sheet thickness of the steel plate in the side wall portion and the inner portion,
Center pillar steel characterized in that the product of the yield strength of the steel sheet at the side wall surface portion and the cube of the plate thickness is equal to the product of the yield strength of the steel plate at the inner portion and the cube of the plate thickness. Element.
[2] The outer portion is made of a steel plate,
The pair of side wall surface portions and the inner portion are formed of a formed member obtained by forming a steel plate different from the steel plate,
The product of the yield strength and the cube of the plate thickness of the steel plate forming the outer part is higher than the product of the yield strength and the cube of the plate thickness of the another steel plate forming the forming member. Item 2. A steel member for a center pillar according to Item 1.
[3] The pair of side wall surface portions and the outer portion are formed of a formed member obtained by forming a steel plate,
The steel member for a center pillar according to claim 1, wherein the yield strength of the outer portion is higher than the yield strength of the side wall surface portion by quenching.

板厚が均一であることを前提にして、アウター部の降伏強度と側壁面部の降伏強度とが同じである場合、アウター部に衝撃が加わると、アウター部がインナー部側に向けて曲げ変形し、この曲げ変形に伴ってアウター部の変形箇所近傍の側壁面部が座屈変形する。座屈変形した側壁面部は、衝撃荷重を吸収せずに折れモードに遷移する。しかしながら、アウター部の降伏強度を側壁面部の降伏強度よりも高くすると、衝突荷重によるアウター部の曲げ変形が衝突箇所のみに集中せず、変形部分がその周囲に広がる。このため、衝突箇所近傍の側壁部が座屈変形しにくくなり、側壁面部が衝撃荷重を吸収するようになり、折れモードへの遷移が抑制される。
これにより、センターピラー用鋼部材のアウター部に衝突荷重が加わった場合であっても、センターピラー用鋼部材が大きく変形することがなく、乗員の安全性を高めることができる。同時に、補強部材が不要なので、センターピラー用鋼部材の軽量化を図ることができる。 Assuming that the plate thickness is uniform, when the yield strength of the outer part and the yield strength of the side wall surface part are the same, when the outer part is impacted, the outer part bends and deforms toward the inner part side. In accordance with this bending deformation, the side wall surface portion in the vicinity of the deformation portion of the outer portion is buckled and deformed. The side wall surface portion that has buckled and deformed transitions to the folding mode without absorbing the impact load. However, if the yield strength of the outer portion is higher than the yield strength of the side wall surface portion, the bending deformation of the outer portion due to the collision load does not concentrate only on the collision location, and the deformation portion spreads around the periphery. For this reason, the side wall near the collision location is unlikely to buckle, the side wall surface absorbs the impact load, and the transition to the folding mode is suppressed.
Thereby, even if it is a case where a collision load is added to the outer part of the steel member for center pillars, the steel member for center pillars does not deform | transform greatly, and it can improve a passenger | crew's safety. At the same time, since the reinforcing member is unnecessary, the weight of the steel member for the center pillar can be reduced.

図１は本発明の第１の実施形態であるセンターピラー用鋼部材を備えた車両の斜視図である。FIG. 1 is a perspective view of a vehicle provided with a center pillar steel member according to a first embodiment of the present invention. 図２は本発明の第１の実施形態であるセンターピラー用鋼部材の断面図である。FIG. 2 is a sectional view of a center pillar steel member according to the first embodiment of the present invention. 図３はセンターピラー用鋼部材に衝撃が加わった場合の変形状態を説明する図である。FIG. 3 is a view for explaining a deformed state when an impact is applied to the center pillar steel member. 図４は、センターピラー用鋼部材の吸収エネルギーとストライカーのストローク量との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the absorbed energy of the center pillar steel member and the stroke amount of the striker. 図５は本発明の第２の実施形態であるセンターピラー用鋼部材の断面図である。FIG. 5 is a cross-sectional view of a center pillar steel member according to a second embodiment of the present invention.

（第１の実施形態）
以下、本発明の第１の実施形態であるセンターピラー用鋼部材について図面を参照して説明する。 (First embodiment)
Hereinafter, the steel member for center pillars which is the 1st embodiment of the present invention is explained with reference to drawings.

本実施形態のセンターピラー用鋼部材１は、図１及び図２に示すように、アウター部２と、アウター部２の幅方向両側に接続される一対の側壁面部３と、一対の側壁面部３に接続されるとともにアウター部２に対向して車両の内側に配置されるインナー部４とを備えている。アウター部２、側壁面部３及びインナー部４は鋼板で構成されている。そして、本実施形態では、アウター部２における鋼板の降伏強度と板厚の３乗との積が、側壁面部３における鋼板の降伏強度と板厚の３乗との積よりも高くなっている。   As shown in FIGS. 1 and 2, the center pillar steel member 1 of the present embodiment includes an outer portion 2, a pair of side wall surface portions 3 connected to both sides in the width direction of the outer portion 2, and a pair of side wall surface portions 3. And an inner portion 4 disposed on the inner side of the vehicle so as to face the outer portion 2. The outer part 2, the side wall surface part 3, and the inner part 4 are made of steel plates. In the present embodiment, the product of the yield strength of the steel plate and the cube of the plate thickness in the outer portion 2 is higher than the product of the yield strength of the steel plate and the cube of the plate thickness in the side wall surface portion 3.

より詳細には、図２に示すように、本実施形態のセンターピラー用鋼部材１は、アウター部２が鋼板１２で構成されている。また、一対の側壁面部３及びインナー部４は、アウター部２をなす鋼板１２とは別の鋼板１３で構成されている。一対の側壁面部３及びインナー部４は、別の鋼板１３を成形部材１３ａに成形加工することによって構成される。成形部材１３ａは、インナー部４と、インナー部４の幅方向両側に接続された一対の側壁面部３と、各側壁面部３に接続されたフランジ部５とから構成される。   More specifically, as shown in FIG. 2, the center pillar steel member 1 of the present embodiment has an outer portion 2 made of a steel plate 12. Further, the pair of side wall surface portions 3 and the inner portion 4 are constituted by a steel plate 13 different from the steel plate 12 forming the outer portion 2. A pair of side wall surface part 3 and the inner part 4 are comprised by shape | molding another steel plate 13 into the shaping | molding member 13a. The molding member 13 a includes an inner portion 4, a pair of side wall surface portions 3 connected to both sides in the width direction of the inner portion 4, and a flange portion 5 connected to each side wall surface portion 3.

そして、本実施形態のセンターピラー用鋼部材１は、成形部材１３ａのフランジ部５に、アウター部２をなす鋼板１２を重ね合わせて溶接することで中空状の部材として構成される。   And the steel member 1 for center pillars of this embodiment is comprised as a hollow member by superimposing and welding the steel plate 12 which makes the outer part 2 to the flange part 5 of the shaping | molding member 13a.

図１及び図２に示すように、センターピラー用鋼部材１を自動車の車体に取り付ける際は、アウター部２が車両の外側に配置され、インナー部４が車両の内側に配置されるように取り付けられる。   As shown in FIGS. 1 and 2, when the center pillar steel member 1 is attached to the vehicle body, the outer part 2 is disposed outside the vehicle and the inner part 4 is disposed inside the vehicle. It is done.

本実施形態においては、アウター部２をなす鋼板１２の降伏強度と板厚の３乗との積が、側壁面部３をなす別の鋼板１３の降伏強度と板厚の３乗との積より高くなっている。これにより、アウター部２における降伏強度と板厚の３乗との積が、側壁面部３における降伏強度と板厚の３乗との積より高くなるように構成される。   In this embodiment, the product of the yield strength of the steel plate 12 forming the outer portion 2 and the cube of the plate thickness is higher than the product of the yield strength of another steel plate 13 forming the side wall surface portion 3 and the cube of the plate thickness. It has become. Thus, the product of the yield strength and the plate thickness of the outer portion 2 is higher than the product of the yield strength and the plate thickness of the side wall surface portion 3.

アウター部２をなす鋼板１２の板厚ｔ１及び降伏強度Ｍ１と、側壁面部３及びインナー部４をなす別の鋼板１３の板厚ｔ２及び降伏強度Ｍ２は、ｔ１ ３・Ｍ１＞ｔ２ ３・Ｍ２の関係を満たすならば、どのような値であってもよいが、好ましくは、板厚ｔ１、ｔ２は同じ厚みにするとよい。従って、Ｍ１＞Ｍ２になるように、各鋼板１２、１３の材質を選定するとよい。 The plate thickness t 1 and the yield strength M 1 of the steel plate 12 forming the outer portion 2 and the plate thickness t 2 and the yield strength M 2 of another steel plate 13 forming the side wall surface portion 3 and the inner portion 4 are t 1 3 · M 1. Any value may be used as long as the relationship> t 2 3 · M 2 is satisfied. Preferably, the plate thicknesses t 1 and t 2 are the same. Therefore, the material of each steel plate 12 and 13 is preferably selected so that M 1 > M 2 .

積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差は、小さすぎると衝撃吸収の効果が小さくなるので好ましくない。積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差が大きいほど、衝撃吸収の効果が大きくなる。しかし、積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差が大きすぎると、側壁面部３及びインナー部４をなす別の鋼板１３の板厚ｔ２及び降伏強度Ｍ２が極端に小さくなり、センターピラー用鋼部材１自体の強度が低下するので好ましくない。 If the difference between the product (t 1 3 · M 1 ) and the product (t 2 3 · M 2 ) is too small, the impact absorption effect is reduced, which is not preferable. The greater the difference between the product (t 1 3 · M 1 ) and the product (t 2 3 · M 2 ), the greater the impact absorption effect. However, if the difference between the product (t 1 3 · M 1 ) and the product (t 2 3 · M 2 ) is too large, the thickness t 2 and the yield strength of another steel plate 13 forming the side wall surface portion 3 and the inner portion 4 will be described. M 2 becomes extremely small, undesirably the strength of the center pillar steel member 1 itself is reduced.

より好ましくは、成形部材１３ａをなす鋼板１３の降伏鋼強度Ｍ２を５００ＭＰａ以上とし、板厚ｔ２を１．２ｍｍ以上とし、さらに積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差を３００Ｎｍ以上にするとよい。 More preferably, the yield steel strength M 2 of the steel plate 13 forming the molding member 13a and above 500 MPa, a sheet thickness t 2 and above 1.2 mm, further the product (t 1 3 · M 1) and product (t 2 3 · The difference from M 2 ) is preferably 300 Nm or more.

具体的には、アウター部２を構成する鋼板１２の降伏強度Ｍ１は、７００〜１２００ＭＰａの範囲が好ましく、８５０〜１２００ＭＰａの範囲がより好ましい。また、板厚ｔ１は１．２〜２．０ｍｍの範囲が好ましく、１．６〜２．０ｍｍの範囲がより好ましい。
また、側壁面部３及びインナー部４を構成する別の鋼板１３の降伏強度Ｍ２は、５００〜８５０ＭＰａの範囲が好ましく、６００〜７００ＭＰａの範囲がより好ましい。また、板厚ｔ２は１．０〜１．６ｍｍの範囲が好ましく、１．０〜１．４ｍｍの範囲がより好ましい。 Specifically, the yield strength M 1 of the steel plate 12 constituting the outer portion 2 is preferably in the range of 700～1200MPa, range 850~1200MPa is more preferable. Further, the thickness t 1 is preferably in the range of 1.2 to 2.0 mm, the range of 1.6~2.0mm is more preferable.
Further, the yield strength M 2 of another steel plate 13 constituting the sidewall portions 3 and the inner part 4 is preferably in the range of 500～850MPa, range 600~700MPa is more preferable. Further, the thickness t 2 is preferably in the range of 1.0～1.6Mm, range 1.0~1.4mm is more preferable.

次に、衝撃試験の結果を通じて、本実施形態のセンターピラー用鋼部材１の作用を説明する。図３（Ａ）には、本実施形態のセンターピラー用鋼部材１の衝撃試験方法を示し、図３（Ｂ）〜図３（Ｄ）には衝撃試験時のセンターピラー用鋼部材１の変形状態を示す。   Next, the effect | action of the steel member 1 for center pillars of this embodiment is demonstrated through the result of an impact test. FIG. 3A shows an impact test method for the center pillar steel member 1 of the present embodiment, and FIGS. 3B to 3D show the deformation of the center pillar steel member 1 during the impact test. Indicates the state.

図３（Ａ）に示すように、センターピラー用鋼部材１の衝撃試験方法は、センターピラー用鋼部材１の長手方向一端１ａと他端１ｂとをそれぞれ試験治具２１に固定した上で、ストライカー２２と呼ばれる半円筒状の治具を、センターピラー用鋼部材１の長手方向中央部分に衝突させる。センターピラー用鋼部材１を試験治具２１に固定する際には、アウター部２が上側を向くように固定する。そして、上方からアウター部２に向けてストライカー２２を落下させることにより、衝撃試験を行う。   As shown in FIG. 3A, the impact test method for the center pillar steel member 1 is performed by fixing the longitudinal end 1a and the other end 1b of the center pillar steel member 1 to the test jig 21, respectively. A semi-cylindrical jig called a striker 22 is caused to collide with the central portion in the longitudinal direction of the center pillar steel member 1. When fixing the steel member 1 for center pillars to the test jig 21, it fixes so that the outer part 2 may face the upper side. Then, the impact test is performed by dropping the striker 22 toward the outer portion 2 from above.

図３（Ｂ）及び図３（Ｃ）は、アウター部２をなす鋼板１２の板厚ｔ１及び降伏強度Ｍ１と、側壁面部３及びインナー部４をなす別の鋼板１３の板厚ｔ２及び降伏強度Ｍ２との関係を、ｔ１ ３・Ｍ１≦ｔ２ ３・Ｍ２にした例である。図３（Ｂ）及び図３（Ｃ）に示すように、ｔ１ ３・Ｍ１≦ｔ２ ３・Ｍ２とした場合は、アウター部２に衝撃が加わると、アウター部２がインナー部４側に向けて曲げ変形し、この曲げ変形に伴って衝撃を受けた箇所の近傍の側壁面部３が座屈変形する。座屈変形した側壁面部３は、衝撃荷重を吸収せずに折れモードに遷移する。 3B and 3C show the plate thickness t 1 and yield strength M 1 of the steel plate 12 forming the outer portion 2, and the plate thickness t 2 of another steel plate 13 forming the side wall surface portion 3 and the inner portion 4. And the relationship with the yield strength M 2 is t 1 3 · M 1 ≦ t 2 3 · M 2 . As shown in FIGS. 3B and 3C, when t 1 3 · M 1 ≦ t 2 3 · M 2 , when an impact is applied to the outer portion 2, the outer portion 2 becomes the inner portion 4. The side wall surface portion 3 in the vicinity of the portion subjected to the impact deformation accompanying the bending deformation is buckled and deformed. The buckled and deformed side wall surface portion 3 transitions to the folding mode without absorbing the impact load.

一方、図３（Ｄ）は、アウター部２をなす鋼板１２の板厚ｔ１及び降伏強度Ｍ１と、側壁面部３及びインナー部４をなす別の鋼板１３の板厚ｔ２及び降伏強度Ｍ２との関係を、ｔ１ ３・Ｍ１＞ｔ２ ３・Ｍ２にした例である。図３（Ｄ）に示すように、ｔ１ ３・Ｍ１＞ｔ２ ３・Ｍ２とした場合は、衝突荷重によるアウター部２の曲げ変形が衝突箇所のみに集中せず、変形部分がその周囲に広がる。このため、衝突箇所近傍の側壁面部３が座屈変形しにくくなり、側壁面部３が衝撃荷重を吸収するようになり、折れモードへの遷移が抑制される。 On the other hand, FIG. 3D shows the plate thickness t 1 and yield strength M 1 of the steel plate 12 forming the outer portion 2, and the plate thickness t 2 and yield strength M of another steel plate 13 forming the side wall surface portion 3 and the inner portion 4. In this example , t 1 3 · M 1 > t 2 3 · M 2 is set. As shown in FIG. 3D, when t 1 3 · M 1 > t 2 3 · M 2 , the bending deformation of the outer portion 2 due to the collision load is not concentrated only on the collision location, and the deformation portion is Spread around. For this reason, the side wall surface portion 3 in the vicinity of the collision location is less likely to buckle and deform, the side wall surface portion 3 absorbs the impact load, and the transition to the folding mode is suppressed.

図４に示すように、図３（Ｄ）のごとくｔ１ ３・Ｍ１＞ｔ２ ３・Ｍ２とした場合は、図３（Ｂ）または図３（Ｃ）のごとくｔ１ ３・Ｍ１≦ｔ２ ３・Ｍ２とした場合に比べて、吸収エネルギーが大きくなっていることが分かる。 As shown in FIG. 4, the case of the t 1 3 · M 1> t 2 3 · M 2 as in FIG. 3 (D), t 1 3 · M as shown in FIG. 3 (B) or FIG. 3 (C) It can be seen that the absorbed energy is larger than when 1 ≦ t 2 3 · M 2 .

以上のように、本実施形態によれば、センターピラー用鋼部材１のアウター部２に衝突荷重が加わった場合であっても、センターピラー用鋼部材１が大きく変形することがなく、乗員の安全性を高めることができる。同時に、補強部材が不要なので、センターピラー用鋼部材１の軽量化を図ることができる。   As described above, according to the present embodiment, even when a collision load is applied to the outer portion 2 of the center pillar steel member 1, the center pillar steel member 1 is not greatly deformed, and Safety can be increased. At the same time, since the reinforcing member is unnecessary, the center pillar steel member 1 can be reduced in weight.

（第２の実施形態）
次に、本発明の第２の実施形態について、図面を参照して説明する。
本実施形態のセンターピラー用鋼部材３１は、図５に示すように、アウター部３２と、アウター部３２の幅方向両側に接続される一対の側壁面部３３と、一対の側壁面部３３に接続されるとともにアウター部３２に対向して車両の内側に配置されるインナー部３４とを備えている。アウター部３２、インナー部３４及び側壁面部３３は鋼板で構成されている。 (Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 5, the center pillar steel member 31 of the present embodiment is connected to the outer portion 32, the pair of side wall surface portions 33 connected to both sides in the width direction of the outer portion 32, and the pair of side wall surface portions 33. And an inner portion 34 disposed inside the vehicle so as to face the outer portion 32. The outer part 32, the inner part 34, and the side wall surface part 33 are comprised with the steel plate.

図５に示すように、本実施形態のセンターピラー用鋼部材３１は、インナー部３４が鋼板４１で構成されている。また、一対の側壁面部３３及びアウター部３２は、インナー部３４をなす鋼板４１とは別の鋼板４２から構成されている。別の鋼板４２は、成形加工されることによって成形部材４２ａとされる。成形部材４２ａは、アウター部３２と、アウター部３２の幅方向両側に接続された一対の側壁面部３３と、各側壁面部３３に接続されたフランジ部３５とから構成される。   As shown in FIG. 5, the center pillar steel member 31 of this embodiment has an inner portion 34 formed of a steel plate 41. The pair of side wall surface portions 33 and the outer portion 32 are composed of a steel plate 42 different from the steel plate 41 forming the inner portion 34. Another steel plate 42 is formed into a formed member 42a by being processed. The molding member 42 a includes an outer portion 32, a pair of side wall surface portions 33 connected to both sides in the width direction of the outer portion 32, and a flange portion 35 connected to each side wall surface portion 33.

そして、本実施形態のセンターピラー用鋼部材３１は、成形部材４２ａのフランジ部３５に、インナー部３４をなす鋼板４１を重ね合わせて溶接することで中空状の部材として構成される。   And the steel member 31 for center pillars of this embodiment is comprised as a hollow member by superimposing and welding the steel plate 41 which makes the inner part 34 on the flange part 35 of the forming member 42a.

センターピラー用鋼部材３１を自動車の車体に取り付ける際は、アウター部３２が車両の外側に配置され、インナー部３４が車両の内側に配置される。   When the center pillar steel member 31 is attached to the vehicle body, the outer portion 32 is disposed outside the vehicle, and the inner portion 34 is disposed inside the vehicle.

本実施形態においては、アウター部３２が焼き入れされており、アウター部３２の降伏強度が側壁面部３３の降伏強度より高くされている。板厚については、アウター部３２及び側壁面部３３は別の鋼板４２が成形加工されることによって形成されたものであるから、ほぼ同じ板厚になる。その結果、アウター部３２における降伏強度と板厚の３乗との積が、側壁面部３３における降伏強度と板厚の３乗との積より高くなる。   In the present embodiment, the outer portion 32 is quenched, and the yield strength of the outer portion 32 is higher than the yield strength of the side wall surface portion 33. About plate | board thickness, since the outer part 32 and the side wall surface part 33 are formed by shape | molding another steel plate 42, they become substantially the same board thickness. As a result, the product of the yield strength and the plate thickness of the outer portion 32 is higher than the product of the yield strength and the plate thickness of the side wall surface portion 33.

焼き入れによるアウター部３２の降伏強度の上昇幅は、焼き入れ前の降伏強度に対して２００％以下程度にすることが望ましく、２０〜１４０％程度にすることがより望ましい。降伏強度の上昇幅は、鋼板の材質の選定や、焼入条件を調整することによって制御できる。   The increase width of the yield strength of the outer portion 32 due to quenching is preferably about 200% or less with respect to the yield strength before quenching, and more preferably about 20 to 140%. The increase in the yield strength can be controlled by selecting the material of the steel plate and adjusting the quenching conditions.

焼き入れ後のアウター部３２における板厚ｔ１及び降伏強度Ｍ１と、側壁面部３３における板厚ｔ２及び降伏強度Ｍ２との関係は、ｔ１ ３・Ｍ１＞ｔ２ ３・Ｍ２を満たすことが望ましい。積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差は、小さすぎると衝撃吸収の効果が小さくなるので好ましくない。積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差が大きいほど、衝撃吸収の効果が大きくなるが、焼き入れによる降伏強度の上昇幅には限度があるので、降伏強度以外の特性値が悪化しない範囲で積の差を広げるとよい。
より好ましくは、アウター部３２における降伏強度Ｍ１を７００ＭＰａ以上とし、側壁面部３３における降伏強度Ｍ２を５００ＭＰａ以上とし、積（ｔ１ ３・Ｍ１）と積（ｔ２ ３・Ｍ２）との差を３００Ｎｍ以上にするとよい。 The relationship between the plate thickness t 1 and the yield strength M 1 in the outer portion 32 after quenching and the plate thickness t 2 and the yield strength M 2 in the side wall surface portion 33 is t 1 3 · M 1 > t 2 3 · M 2. It is desirable to satisfy. If the difference between the product (t 1 3 · M 1 ) and the product (t 2 3 · M 2 ) is too small, the impact absorption effect is reduced, which is not preferable. The greater the difference between the product (t 1 3 · M 1 ) and the product (t 2 3 · M 2 ), the greater the impact absorption effect, but there is a limit to the increase in yield strength due to quenching, It is good to widen the product difference within a range where the characteristic values other than the yield strength do not deteriorate.
More preferably, the yield strength M 1 in the outer portion 32 is 700 MPa or more, the yield strength M 2 in the side wall surface portion 33 is 500 MPa or more, and the product (t 1 3 · M 1 ) and product (t 2 3 · M 2 ) It is preferable to make the difference of 300 Nm or more.

具体的には、アウター部３２における降伏強度Ｍ１は、７００〜１２００ＭＰａの範囲が好ましく、８５０〜１２００ＭＰａの範囲がより好ましい。また、板厚ｔ１は１．２〜２．０ｍｍの範囲が好ましく、１．６〜２．０ｍｍの範囲がより好ましい。
また、側壁面部３３における降伏強度Ｍ２は、５００〜８５０ＭＰａの範囲が好ましく、６００〜７００ＭＰａの範囲がより好ましい。また、板厚ｔ２は１．０〜１．６ｍｍの範囲が好ましく、１．０〜１．４ｍｍの範囲がより好ましい。 Specifically, the yield strength M 1 in the outer portion 32 is preferably in the range of 700～1200MPa, range 850~1200MPa is more preferable. Further, the thickness t 1 is preferably in the range of 1.2 to 2.0 mm, the range of 1.6~2.0mm is more preferable.
Further, the yield strength M 2 in sidewall portions 33 is preferably in the range of 500～850MPa, range 600~700MPa is more preferable. Further, the thickness t 2 is preferably in the range of 1.0～1.6Mm, range 1.0~1.4mm is more preferable.

更に、インナー部３４を構成する鋼板の降伏強度Ｍ３及び板厚ｔ３は特に制限がない。降伏強度Ｍ３は、５００〜１２００ＭＰａの範囲としてもよく、７００〜１２００ＭＰａの範囲としてもよい。また、板厚ｔ３は１．０〜２．０ｍｍの範囲としてもよく、１．６〜２．０ｍｍの範囲としてもよい。 Furthermore, the yield strength M 3 and the plate thickness t 3 of the steel plate constituting the inner part 34 are not particularly limited. Yield strength M 3 are, may be in the range of 500～1200MPa, it may be in the range of 700～1200MPa. Further, the thickness t 3 may be in the range of 1.0 to 2.0 mm, may be in the range of 1.6～2.0Mm.

本実施形態のセンターピラー用鋼部材３１は、第１の実施形態と同様の効果が得られる。   The center pillar steel member 31 of the present embodiment can obtain the same effects as those of the first embodiment.

１、３１…センターピラー用鋼部材、２、３２…アウター部、３、３３…側壁面部、４、３４…インナー部、１２…鋼板、１３…別の鋼板（鋼板）、１３ａ、４２ａ…成形部材。   DESCRIPTION OF SYMBOLS 1, 31 ... Steel member for center pillars, 2, 32 ... Outer part, 3, 33 ... Side wall surface part, 4, 34 ... Inner part, 12 ... Steel plate, 13 ... Another steel plate (steel plate), 13a, 42a ... Forming member .

Claims (3)

車両の外側に向けて配置されるアウター部と、前記アウター部の幅方向両側に接続される一対の側壁面部と、前記一対の側壁面部に接続されるとともに前記アウター部に対向して車両の内側に配置されるインナー部とを備え、
前記アウター部、前記側壁面部及び前記インナー部が鋼板から構成され、
前記アウター部における前記鋼板の降伏強度と板厚の３乗との積が、前記側壁面部及び前記インナー部における前記鋼板の降伏強度と板厚の３乗との積よりも高く、
前記側壁面部における前記鋼板の降伏強度と板厚の３乗との積と、前記インナー部における前記鋼板の降伏強度と板厚の３乗との積が等しい、ことを特徴とするセンターピラー用鋼部材。 An outer portion disposed toward the outer side of the vehicle, a pair of side wall surface portions connected to both sides in the width direction of the outer portion, and an inner side of the vehicle that is connected to the pair of side wall surface portions and faces the outer portion And an inner part arranged on the
The outer part, the side wall surface part and the inner part are made of a steel plate,
The product of the cube of the yield strength and sheet thickness of the steel plate at the outer portion, rather higher than the product of the cube of the yield strength and sheet thickness of the steel plate in the side wall portion and the inner portion,
Center pillar steel characterized in that the product of the yield strength of the steel sheet at the side wall surface portion and the cube of the plate thickness is equal to the product of the yield strength of the steel plate at the inner portion and the cube of the plate thickness. Element. 前記アウター部が鋼板で構成され、
前記一対の側壁面部及び前記インナー部が前記鋼板とは別の鋼板を成形加工した成形部材で構成され、
前記アウター部をなす前記鋼板の降伏強度と板厚の３乗との積が、前記成形部材をなす前記別の鋼板の降伏強度と板厚の３乗との積より高いことを特徴とする請求項１に記載のセンターピラー用鋼部材。 The outer part is made of a steel plate,
The pair of side wall surface portions and the inner portion are formed of a formed member obtained by forming a steel plate different from the steel plate,
The product of the yield strength and the cube of the plate thickness of the steel plate forming the outer part is higher than the product of the yield strength and the cube of the plate thickness of the another steel plate forming the forming member. Item 2. A steel member for a center pillar according to Item 1. 前記一対の側壁面部および前記アウター部が鋼板を成形加工した成形部材で構成され、
前記アウター部の降伏強度が焼き入れによって前記側壁面部の降伏強度より高くされていることを特徴とする請求項１に記載のセンターピラー用鋼部材。 The pair of side wall surface portions and the outer portion are formed of a molded member obtained by molding a steel plate,
The steel member for a center pillar according to claim 1, wherein the yield strength of the outer portion is higher than the yield strength of the side wall surface portion by quenching.
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