JP6285675B2

JP6285675B2 - Center pillar reinforcement member

Info

Publication number: JP6285675B2
Application number: JP2013193877A
Authority: JP
Inventors: 石畝　祐樹; 祐樹石畝
Original assignee: Aisin Takaoka Co Ltd
Current assignee: Aisin Takaoka Co Ltd
Priority date: 2013-09-19
Filing date: 2013-09-19
Publication date: 2018-02-28
Anticipated expiration: 2033-09-19
Also published as: JP2015058810A

Description

本発明は、車両（例えばセダン型乗用車）が備えるセンターピラーを補強するためのセンターピラー補強部材に関する。 The present invention relates to a center pillar reinforcing member for reinforcing a center pillar included in a vehicle (for example, a sedan type passenger car).

従来、車両の側面における衝突の際に搭乗者の安全性を高めるため、センターピラーの内部にセンターピラー補強部材が挿入されている。このセンターピラー補強部材は、軽量でかつ高強度なものが求められている。 Conventionally, a center pillar reinforcing member has been inserted into the center pillar in order to increase the safety of the passenger in the event of a collision on the side of the vehicle. The center pillar reinforcing member is required to be lightweight and have high strength.

軽量でかつ高強度なセンターピラー補強部材を製造する方法の一つとして、加熱した鋼板を、その鋼板とは相対的に低温のプレス型を用いてプレス加工する、いわゆる熱間プレス成形法（「ダイクエンチ工法」ともいう）が用いられている。この熱間プレス成形法を用いることにより、オーステナイト変態温度Ａｃ_３以上に加熱された鋼板はプレス加工により急冷されて焼入れ硬化するため、強度が大幅に向上したセンターピラー補強部材を得ることができる。そのため、センターピラー補強部材の製造に用いる鋼板の板厚を薄くすることができ、軽量のセンターピラー補強部材を得ることができる。 As one of the methods for manufacturing a lightweight and high-strength center pillar reinforcing member, a so-called hot press forming method (“ Also called “die quench method”. By using this hot press forming method, the steel plate heated to the austenite transformation temperature Ac ₃ or higher is quenched by press working and hardened by hardening, so that a center pillar reinforcing member having greatly improved strength can be obtained. Therefore, the plate thickness of the steel plate used for manufacturing the center pillar reinforcing member can be reduced, and a lightweight center pillar reinforcing member can be obtained.

また、車両の側面衝突の際に搭乗者の安全性を高めるため、センターピラー（センターピラー補強部材）を単に高強度化するだけでなく、側面衝突時にセンターピラーの変形モードを適切にコントロールすることも提唱されている。センターピラーの変形モードをコントロールする方法としては、例えばセンターピラー補強部材の強度を部分的に変える方法があり、このような部分的に強度を変えたセンターピラー補強部材は、例えば特許文献１および特許文献２に開示されている。 In addition, in order to increase the safety of passengers in the event of a side collision of the vehicle, not only the center pillar (center pillar reinforcing member) is simply strengthened, but also the deformation mode of the center pillar is appropriately controlled during a side collision. Has also been proposed. As a method for controlling the deformation mode of the center pillar, for example, there is a method of partially changing the strength of the center pillar reinforcing member. Such a partially changed center pillar reinforcing member is disclosed in, for example, Patent Document 1 and Patent It is disclosed in Document 2.

特許文献１は、引張強度の異なる複数の鋼板を一体的に溶接接合した結合鋼板（一般に「テーラードブランク材」と呼ばれる）を、プレス加工によって所定の形状に成形したセンターピラー補強部材について開示する（特許文献１の請求項１、段落００３０および００３１、並びに図１参照）。なお、特許文献１の技術は、冷間プレス加工および熱間プレス加工のいずれにも適用可能とされている（例えば段落００１３、００１７参照）。 Patent Document 1 discloses a center pillar reinforcing member in which a bonded steel plate (generally referred to as a “tailored blank material”) obtained by integrally welding a plurality of steel plates having different tensile strengths is formed into a predetermined shape by press working ( (See claim 1 of patent document 1, paragraphs 0030 and 0031, and FIG. 1). The technique of Patent Document 1 can be applied to both cold pressing and hot pressing (see, for example, paragraphs 0013 and 0017).

特許文献２は、オーステナイト変態温度Ａｃ_３以上融点未満の温度に加熱された鋼板を、金型を用いて成形しながら金型内部で焼入れ処理を行う際に、鋼板の少なくとも一部における冷却速度をその他の部位よりも低速とすることで、センターピラー補強部材の一部を軟化部位として形成したセンターピラー補強部材について開示する。具体的には、軟化部位としたい箇所では、鋼板と金型との間にクリアランスを設けることによって、金型による抜熱が行われずに緩冷となるため、軟化部位が形成されるというものである（特許文献２の請求項８、段落００５０、段落００６１および図３参照）。 Patent Document 2 discloses a cooling rate for at least a part of a steel plate when a steel plate heated to an austenite transformation temperature Ac ₃ or higher and lower than the melting point is subjected to a quenching treatment inside the die while being formed using the die. Disclosed is a center pillar reinforcing member in which a part of the center pillar reinforcing member is formed as a softened portion by making the speed lower than other portions. Specifically, at the location where the softening site is desired, by providing a clearance between the steel plate and the mold, the softening site is formed because heat is slowly removed without removing heat from the mold. (See claim 8, paragraph 0050, paragraph 0061 and FIG. 3 of Patent Document 2).

特開２００９−００１１２１号公報JP 2009-001121 A 特開２００９−２７４５９０号公報JP 2009-274590 A

ところで、センターピラー補強部材においては、当該補強部材の基本な骨格／形状をプレス加工で形作った後に、穴あけ加工やトリミング（トリム加工）などの後加工（二次又は三次加工）を施すことが多い。しかしながら、センターピラー補強部材の全部または大半の部分が熱間プレスによって予め焼入れ硬化されていると、事後的な加工に支障を来たす。具体的には、穴あけ加工やトリミング時に、穴あけ用のパンチ型やトリミング用の型が破損するという問題がある。また、焼入れ硬化された部位に無理に穴あけやトリミングを施すと、当該切断面での残留応力が高くなることによって遅れ破壊（被加工部位が時間遅れで自己崩壊する現象）が発生しやすくなるという問題がある。 By the way, in the center pillar reinforcing member, after the basic skeleton / shape of the reinforcing member is formed by pressing, post-processing (secondary or tertiary processing) such as drilling or trimming is often performed. . However, if all or most of the center pillar reinforcing member is pre-quenched and hardened by hot pressing, the subsequent processing is hindered. Specifically, there is a problem that a punching die for punching or a die for trimming is damaged during drilling or trimming. Also, if forcibly drilling or trimming the hardened part, the residual stress at the cut surface will increase, and delayed fracture (a phenomenon where the part to be processed self-collapses with a time delay) is likely to occur. There's a problem.

この点、特許文献１のテーラードブランク材を採用する技術は、熱間プレス加工後の後加工が抱える問題について、特に解決策を示すものではない。 In this regard, the technique that employs the tailored blank material of Patent Document 1 does not particularly indicate a solution for the problem of post-processing after hot pressing.

他方、特許文献２の技術は、基本的に焼き入れ硬化されるセンターピラー補強部材の一部を意図的に軟化部位（つまり、非焼き入れ部位または焼き入れ不完全部位）とするものであるため、穴あけ等の後加工を配慮しているのかもしれない。しかしながら、特許文献２に開示された方法では、軟化部位は抜熱が行われないため成形終了後でも製品に熱がそのまま残り、その結果、金型から外した後に熱収縮することで製品が変形してしまうおそれがある。そのため、あらかじめ熱収縮を見越した製品設計が必要となったり、あるいは熱収縮した製品の再加工が必要になったりするという別の課題が浮上する。 On the other hand, the technique of Patent Document 2 is to intentionally set a part of the center pillar reinforcing member to be hardened and hardened intentionally as a softened part (that is, a non-quenched part or a hardened part). Maybe, post-processing such as drilling is considered. However, in the method disclosed in Patent Document 2, since heat is not removed from the softened portion, heat remains in the product even after the molding is finished, and as a result, the product is deformed by heat shrinking after being removed from the mold. There is a risk of it. For this reason, another problem arises that it is necessary to design a product in anticipation of heat shrinkage in advance, or it is necessary to rework the heat-shrinked product.

本発明の目的は、鋼板のプレス加工によって製造可能なセンターピラー補強部材であって、強度確保のために局部的な熱間プレス加工により焼入れ硬化された部位と、二次加工等を容易にするために焼入れ硬化されていない部位とを併せ持ったセンターピラー補強部材を提供することにある。 An object of the present invention is a center pillar reinforcing member that can be manufactured by pressing a steel plate, facilitating secondary hardening and the like, a part that has been hardened and hardened by local hot pressing to ensure strength Accordingly, it is an object of the present invention to provide a center pillar reinforcing member having a portion not quenched and hardened.

本発明のセンターピラー補強部材は、
柱状部と、ルーフサイドレールに連結されるべく前記柱状部の上端において車両前後方向に形成された上側取付け部と、サイドシルに連結されるべく前記柱状部の下端において車両前後方向に形成された下側取付け部と、を備え、
前記柱状部、前記上側取付け部および前記下側取付け部が、鋼板のプレス加工によって一体成形されると共に、前記柱状部、前記上側取付け部および前記下側取付け部の各部には、それぞれの少なくとも一部において、アウタ板部、腹板部およびフランジ部からなるクランク状の横断面形状が前記プレス加工により付与されてなるセンターピラー補強部材であって、
前記アウタ板部と前記腹板部との境界には、アウタ稜線部が形成されると共に、
前記腹板部と前記フランジ部との境界には、フランジ稜線部が形成されており、
前記上側取付け部のアウタ稜線部は、車両前後方向から車両高さ方向に次第に向きを変えるように湾曲しながら延びると共に、車両高さ方向に延びる前記柱状部のアウタ稜線部と連続しており、
前記上側取付け部のフランジ稜線部は、車両前後方向から車両高さ方向に次第に向きを変えるように湾曲しながら延びると共に、車両高さ方向に延びる前記柱状部のフランジ稜線部と連続しており、
前記上側取付け部および前記柱状部におけるアウタ稜線部およびフランジ稜線部は局部的な熱間プレス加工によって焼入れ硬化されており、前記上側取付け部および前記柱状部におけるアウタ板部、腹板部およびフランジ部は焼入れ硬化されていない、ことを特徴としている。 The center pillar reinforcing member of the present invention is
A columnar portion, an upper mounting portion formed in the vehicle front-rear direction at the upper end of the columnar portion to be connected to the roof side rail, and a lower portion formed in the vehicle front-rear direction at the lower end of the columnar portion to be connected to the side sill. A side mounting portion,
The columnar portion, the upper mounting portion, and the lower mounting portion are integrally formed by pressing a steel plate, and at least one of each of the columnar portion, the upper mounting portion, and the lower mounting portion is provided. In the portion, a center pillar reinforcing member formed by the press working with a crank-shaped cross-sectional shape composed of an outer plate portion, a belly plate portion and a flange portion,
At the boundary between the outer plate portion and the abdominal plate portion, an outer ridge line portion is formed,
At the boundary between the abdominal plate portion and the flange portion, a flange ridge line portion is formed,
The outer ridge line portion of the upper mounting portion extends while curving so as to gradually change the direction from the vehicle longitudinal direction to the vehicle height direction, and is continuous with the outer ridge line portion of the columnar portion extending in the vehicle height direction,
The flange ridge line portion of the upper mounting portion extends while curving so as to gradually change the direction from the vehicle longitudinal direction to the vehicle height direction, and is continuous with the flange ridge line portion of the columnar portion extending in the vehicle height direction,
The upper mounting portion and the outer ridge portion and the flange ridge of the columnar portion localized hot are quench hardened by press working, the outer plate portion of the upper mounting portion and the columnar portion, webs portion and the flange portion Is characterized by not being hardened by hardening .

上記特徴によれば、一般に、鋼板のプレス加工によって柱状部、上側取付け部および下側取付け部を一体成形すると共に、各部にクランク状の横断面形状を付与した場合、クランク状断面の折り曲げ点にあたるアウタ稜線部（アウタ板部と腹板部との境界部位）およびフランジ稜線部（腹板部とフランジ部との境界部位）が、他の平面状部位（アウタ板部、腹板部およびフランジ部）に比べて相対的に強度的な弱点となる。本発明では、この強度的な弱点となるアウタ稜線部およびフランジ稜線部を、局部的な熱間プレス加工によって選択的に焼入れ硬化することにより、センターピラー補強部材に必要な強度を確保している。その一方で、アウタ稜線部およびフランジ稜線部以外の部位は、基本的に熱間プレス加工ではなく温間プレス加工によって付形されるため、焼入れ硬化はなく、したがって穴あけ加工やトリミング等の後加工において支障をきたさない。 According to the above feature, generally, when the columnar portion, the upper mounting portion, and the lower mounting portion are integrally formed by pressing a steel plate, and a crank-shaped cross-sectional shape is given to each portion, it corresponds to a bending point of the crank-shaped cross section. The outer ridge line part (boundary part between the outer plate part and the abdomen plate part) and the flange ridge line part (boundary part between the abdomen plate part and the flange part) are other planar parts (the outer plate part, the abdominal plate part and the flange part). It is a relatively weak point compared to. In the present invention, the strength required for the center pillar reinforcing member is ensured by selectively quenching and hardening the outer ridge line portion and the flange ridge line portion, which are weak points of strength, by local hot pressing. . On the other hand, parts other than the outer ridge line part and flange ridge line part are basically shaped by warm press work rather than hot press work, so there is no quench hardening, and therefore post-processing such as drilling and trimming. Will not cause any trouble.

また、柱状部のアウタおよびフランジ稜線部が上側取付け部のアウタおよびフランジ稜線部にそれぞれ連続すると共に、当該上側取付け部のアウタおよびフランジ稜線部が上述のように次第に向きを変えるように湾曲していることで、柱状部の上端域及びその近傍（つまり、概ね、柱状部の上端と上側取付け部との境界領域）には、各稜線にとっての端点や折れ点となる箇所が存在しない。従って、これらの端点や折れ点が過負荷時における亀裂等の発生開始点となることが回避されることで、センターピラー補強部材の総合的な強化向上が図られている。 Further, the outer and flange ridge line portions of the columnar portion are continuous with the outer and flange ridge line portions of the upper mounting portion, respectively, and the outer and flange ridge line portions of the upper mounting portion are curved so as to gradually change the direction as described above. As a result, there are no end points or break points for each ridge line in the upper end region of the columnar portion and in the vicinity thereof (that is, in general, the boundary region between the upper end of the columnar portion and the upper mounting portion). Therefore, it is avoided that these end points and break points become starting points of occurrence of cracks and the like at the time of overload, thereby improving the overall strengthening of the center pillar reinforcing member.

前記柱状部におけるアウタ稜線部およびフランジ稜線部は車両高さ方向全長にわたって焼入れ硬化されており、前記下側取付け部におけるアウタ稜線部およびフランジ稜線部も、局部的な熱間プレス加工によって焼入れ硬化されており、焼入れ硬化された前記柱状部におけるアウタ稜線部およびフランジ稜線部は焼入れ硬化された前記下側取付け部におけるアウタ稜線部およびフランジ稜線部とそれぞれ連続していることが好ましい。
なお、前記下側取付け部のアウタ稜線部が、車両高さ方向に延びる前記柱状部のアウタ稜線部と連続すると共に、車両高さ方向から車両前後方向に次第に向きを変えるように湾曲しながら延びており、且つ、前記下側取付け部のフランジ稜線部が、車両高さ方向に延びる前記柱状部のフランジ稜線部と連続すると共に、車両高さ方向から車両前後方向に次第に向きを変えるように湾曲しながら延びていることは、更に好ましい。 The outer ridge line part and the flange ridge line part in the columnar part are hardened and hardened over the entire length in the vehicle height direction, and the outer ridge line part and the flange ridge line part in the lower attachment part are also hardened and hardened by local hot pressing. It is preferable that the outer ridge line portion and the flange ridge line portion in the quench-hardened columnar portion are respectively continuous with the outer ridge line portion and the flange ridge line portion in the quench-hardened lower attachment portion .
The outer ridge line portion of the lower mounting portion is continuous with the outer ridge line portion of the columnar portion extending in the vehicle height direction, and extends while curving so as to gradually change the direction from the vehicle height direction to the vehicle front-rear direction. And the flange ridge line portion of the lower mounting portion is continuous with the flange ridge line portion of the columnar portion extending in the vehicle height direction and is curved so as to gradually change the direction from the vehicle height direction to the vehicle longitudinal direction. However, it is more preferable that it extends.

下側取付け部におけるアウタ稜線部およびフランジ稜線部も、局部的な熱間プレス加工によって焼入れ硬化されていることによって、より強度の高いセンターピラー補強部材を提供することができる。 Since the outer ridge line portion and the flange ridge line portion in the lower attachment portion are also hardened and hardened by local hot pressing, a center pillar reinforcing member having higher strength can be provided.

前記柱状部には、前側のフランジ部から、前側の腹板部、中央のアウタ板部および後側の腹板部を経由して後側のフランジ部に到る横断線に沿って、局部的な熱間プレス加工により焼入れ硬化された線状または帯状の横断焼入れ硬化部が形成されており、
前記線状または帯状の横断焼入れ硬化部は、焼入れ硬化された前記柱状部におけるアウタ稜線部およびフランジ稜線部と交差していることが好ましい。
また、前記柱状部のアウタ稜線部およびフランジ稜線部のうち、前記横断焼入れ硬化部よりも下側の部位、並びに、前記下側取付け部のアウタ稜線部およびフランジ稜線部は、焼入れ硬化されていないことが好ましい。 The columnar portion includes a local line along a transverse line from the front flange portion to the rear flange portion via the front abdominal plate portion, the central outer plate portion, and the rear abdominal plate portion. A linear or belt-like transverse quenching hardened part that is hardened and hardened by hot pressing is formed,
It is preferable that the linear or belt-like transverse quenching and hardening portion intersects the outer ridge line portion and the flange ridge line portion in the quench-hardened columnar portion.
Of the outer ridge line part and the flange ridge line part of the columnar part, the part below the transverse quenching hardening part and the outer ridge line part and flange ridge line part of the lower mounting part are not hardened by hardening. It is preferable.

線状または帯状の横断焼入れ硬化部と、柱状部におけるアウタ稜線部およびフランジ稜線部とが交差していることで、線状または帯状の横断焼入れ硬化部に沿った領域は、当該補強材中でも強度が最も高い部位となる。なお、下側取付け部のアウタおよびフランジ稜線部を焼入れ硬化させていない場合には、当該下側取付け部を含む、横断焼入れ硬化部よりも下方の部位がセンターピラー補強部材の中でも相対的に脆弱な部位になると共に、当該部位と上記線状または帯状の横断焼入れ硬化部との間の強度差が顕著になる。その結果、車両の側面衝突時には、柱状部の中でも、上記横断焼入れ硬化部の下側近傍に位置する部位が相対的に折れ易くなる。このような設計は、センターピラーの変形モードを適切にコントロールするための一手法として極めて有用である。 The region along the linear or belt-like cross-curing hardening part is strong even in the reinforcing material by crossing the linear or belt-like cross-hardening hardening part with the outer ridge line part and flange ridge line part in the columnar part. Is the highest part. In addition, when the outer side of the lower mounting portion and the flange ridge line portion are not hardened by hardening, the portion below the transverse hardening hardened portion including the lower mounting portion is relatively weak among the center pillar reinforcing members. together it becomes a site, the intensity difference between the site and the linear or strip-shaped transverse quench hardened portion becomes remarkable. As a result, at the time of a side collision of the vehicle, a portion of the columnar portion located near the lower side of the transverse quenching and hardening portion is relatively easily broken. Such a design is extremely useful as a technique for appropriately controlling the deformation mode of the center pillar.

好ましくは、前記局部的な熱間プレス加工は、プレス加工される前の鋼板の焼入れ予定部位に対する近赤外線照射による局部的な加熱と、局部的に加熱された鋼板のプレス加工とによって達成される。 Preferably, the localized hot pressing is accomplished with local heating by NIR irradiation for hardening the proposed site of the previous steel sheet stamping, by the pressing of the locally heated steel sheet .

近赤外線は、光の照射領域を制限しやすく、かつ、高速加熱が可能である。そのため、各稜線部や柱状部を横断する横断線のような幅狭であるが線状に延びる部位だけを選択して局所加熱を短時間で行うことができる。 Near-infrared rays can easily limit the light irradiation region and can be heated at high speed. Therefore, it is possible to perform local heating in a short time by selecting only a portion that is narrow but has a linear shape such as a transverse line that crosses each ridge line portion or columnar portion.

本発明によれば、強度確保のために局部的な熱間プレス加工により焼入れ硬化された部位と、二次加工等を容易にするために焼入れ硬化されていない部位とを併せ持ったセンターピラー補強部材を提供できる。 According to the present invention, a center pillar reinforcing member having both a part that has been hardened by local hot pressing to ensure strength and a part that has not been hardened to facilitate secondary processing or the like. Can provide.

本発明の第一実施形態におけるセンターピラー補強部材の正面図である。It is a front view of the center pillar reinforcement member in a first embodiment of the present invention. （ａ）は図１におけるＡ−Ａ矢視断面図、（ｂ）は図１におけるＢ−Ｂ矢視断面図、（ｃ）は図１におけるＣ−Ｃ矢視断面図である。1A is a cross-sectional view taken along the line AA in FIG. 1, FIG. 1B is a cross-sectional view taken along the line BB in FIG. 1, and FIG. （ａ）は鋼板を加熱装置にセットした状態を表す側面視での概略図、（ｂ）は熱遮蔽プレートの概略平面図、（ｃ）は熱間プレス加工後の鋼板に対して穴あけ加工およびトリミングを施した後の概略平面図である。(A) is a schematic diagram in a side view showing a state in which a steel plate is set in a heating device, (b) is a schematic plan view of a heat shielding plate, and (c) is a drilling process for a steel plate after hot pressing. It is a schematic plan view after performing trimming. 本発明の第二実施形態におけるセンターピラー補強部材の正面図である。It is a front view of the center pillar reinforcement member in the second embodiment of the present invention. （ａ）は図４におけるＤ−Ｄ矢視断面図、（ｂ）は図４におけるＥ−Ｅ矢視断面図である。(A) is the DD arrow sectional drawing in FIG. 4, (b) is the EE arrow sectional drawing in FIG. 本発明の第二実施形態におけるセンターピラー補強部材を製造するために用いる熱遮蔽プレートの概略平面図である。It is a schematic plan view of the heat shielding plate used in order to manufacture the center pillar reinforcement member in 2nd embodiment of this invention.

本発明のセンターピラー補強部材を、図面を参照しながら説明する。 The center pillar reinforcing member of the present invention will be described with reference to the drawings.

［第一実施形態］
図１に示すように、本発明のセンターピラー補強部材１は、紙面の上下方向（即ち車両の高さ方向）に延びる柱状部２と、車両のルーフサイドレール（図示略）に連結されるべく柱状部２の上端において車両前後方向（紙面の左右方向）に張り出し形成された上側取付け部３と、車両のサイドシル（図示略）に連結されるべく柱状部２の下端において車両前後方向（紙面の左右方向）に張り出し形成された下側取付け部４とを備えている。なお、柱状部２、上側取付け部３および下側取付け部４は、単一の鋼板６（図２（ａ）参照）をプレス加工することで一体成形されている。また本実施形態では、柱状部２及び下側取付け部４において、例えばドアストライカーやドアヒンジやハーネスなどの他の部品を取り付けるための貫通孔５が複数設けられている。鋼板６としては、亜鉛やアルミニウム等のメッキ鋼板を使用することもできる。 [First embodiment]
As shown in FIG. 1, the center pillar reinforcing member 1 of the present invention is to be connected to a columnar portion 2 extending in the vertical direction of the paper (that is, the height direction of the vehicle) and a roof side rail (not shown) of the vehicle. The upper mounting portion 3 is formed to project in the vehicle front-rear direction (left-right direction of the paper surface) at the upper end of the columnar portion 2, and the vehicle front-rear direction (paper surface direction) at the lower end of the columnar portion 2 to be connected to the side sill (not shown) of the vehicle. And a lower mounting portion 4 that projects in the left-right direction. The columnar portion 2, the upper mounting portion 3, and the lower mounting portion 4 are integrally formed by pressing a single steel plate 6 (see FIG. 2A). In the present embodiment, the columnar portion 2 and the lower attachment portion 4 are provided with a plurality of through holes 5 for attaching other components such as a door striker, a door hinge, and a harness. As the steel plate 6, a plated steel plate such as zinc or aluminum can also be used.

図１及び図２（ａ）〜（ｃ）に示すように、柱状部２、上側取付け部３および下側取付け部４には、鋼板６をプレス加工することによって、アウタ板部７、一対の腹板部８（前側腹板部８ａ、後側腹板部８ｂ）、および一対のフランジ部９（前側フランジ部９ａ、後側フランジ部９ｂ）から形成されるクランク状の横断面形状がそれぞれ付与されている。ここで、本明細書において「クランク状」とは、腹板部８とフランジ部９とが略Ｌ字状の連結関係にあり、腹板部８とアウタ板部７とが略逆Ｌ字状の連結関係にあり、腹板部８の両端にそれぞれ位置するフランジ部９とアウタ板部７とが互いに反対方向を向いているような、三者（アウタ板部７、腹板部８、フランジ部９）間の横断面形状をいう。 As shown in FIG. 1 and FIGS. 2A to 2C, the columnar portion 2, the upper mounting portion 3, and the lower mounting portion 4 are formed by pressing a steel plate 6, thereby forming an outer plate portion 7 and a pair of pairs. A crank-shaped cross-sectional shape formed by the abdominal plate portion 8 (front side abdominal plate portion 8a, rear side abdominal plate portion 8b) and a pair of flange portions 9 (front side flange portion 9a, rear side flange portion 9b) is provided. Has been. Here, in the present specification, “crank shape” means that the abdominal plate portion 8 and the flange portion 9 are connected in a substantially L shape, and the abdominal plate portion 8 and the outer plate portion 7 are substantially inverted L shapes. In which the flange portion 9 and the outer plate portion 7 respectively positioned at both ends of the abdominal plate portion 8 face in opposite directions to each other (the outer plate portion 7, the abdominal plate portion 8, the flange). The cross sectional shape between the portions 9).

そして、アウタ板部７と一対の腹板部８との境界には一対のアウタ稜線部１０が形成されているとともに、一対の腹板部８と一対のフランジ部９との境界には一対のフランジ稜線部１１が形成されている。 A pair of outer ridge line portions 10 are formed at the boundary between the outer plate portion 7 and the pair of abdominal plate portions 8, and a pair of boundary portions between the pair of the abdominal plate portions 8 and the pair of flange portions 9 are formed. A flange ridge portion 11 is formed.

上側取付け部３のアウタ稜線部１０ａは、車両前後方向から車両の高さ方向に次第に向きを変えるように湾曲しながら延びており、車両の高さ方向に延びる柱状部２のアウタ稜線部１０ｂと連続している。そして、下側取付け部４のアウタ稜線部１０ｃは、柱状部２のアウタ稜線部１０ｂと連続しており、車両の高さ方向から車両の前後方向に次第に向きを変えるように湾曲しながら延びている。 The outer ridge line portion 10a of the upper mounting portion 3 extends while curving so as to gradually change the direction from the vehicle longitudinal direction to the vehicle height direction, and the outer ridge line portion 10b of the columnar portion 2 extending in the vehicle height direction. It is continuous. The outer ridge line portion 10c of the lower mounting portion 4 is continuous with the outer ridge line portion 10b of the columnar portion 2, and extends while curving so as to gradually change the direction from the vehicle height direction to the vehicle front-rear direction. Yes.

また、アウタ稜線部１０ａと同様に、上側取付け部３のフランジ稜線部１１ａも、車両前後方向から車両の高さ方向に次第に向きを変えるように湾曲しながら延びており、車両の高さ方向に延びる柱状部２のフランジ稜線部１１ｂと連続している。そして、下側取付け部４のフランジ稜線部１１ｃは、柱状部２のフランジ稜線部１１ｂと連続しており、車両の高さ方向から車両の前後方向に次第に向きを変えるように湾曲しながら延びている。 Similarly to the outer ridge line portion 10a, the flange ridge line portion 11a of the upper mounting portion 3 extends while curving so as to gradually change the direction from the vehicle front-rear direction to the vehicle height direction, and in the vehicle height direction. It is continuous with the flange ridge line part 11b of the columnar part 2 that extends. And the flange ridgeline part 11c of the lower side attachment part 4 is following the flange ridgeline part 11b of the columnar part 2, and it extends, curving so that it may change direction gradually from the height direction of a vehicle to the front-back direction of a vehicle. Yes.

本実施形態のセンターピラー補強部材１のアウタ稜線部１０（１０ａ、１０ｂ、１０ｃ）とフランジ稜線部１１（１１ａ、１１ｂ、１１ｃ）とは、熱間プレス加工により焼入れ硬化されているが、その一方で、それ以外の部位であるアウタ板部７、腹板部８およびフランジ部９は焼入れされていない。アウタ稜線部１０およびフランジ稜線部１１は、クランク状断面の折り曲げ点にあたる部位であり、他の平面状部位であるアウタ板部７、腹板部８およびフランジ部９に比べて相対的に強度が弱くなる部位である。特に、アウタ稜線部１０ａ、アウタ稜線部１０ｃ、フランジ稜線部１１ａおよびフンラジ稜線部１１ｃにおける湾曲部位は強度的に弱くなる部位であり、強度を向上させることが求められる部位である。本発明では、この強度的に弱点となるアウタ稜線部１０（１０ａ、１０ｂ、１０ｃ）およびフランジ稜線部１１（１１ａ、１１ｂ、１１ｃ）を、局部的な熱間プレス加工によって選択的に焼入れ硬化することにより、センターピラー補強部材に必要な強度が確保されている。なお、アウタ稜線部１０（１０ａ、１０ｂ、１０ｃ）およびフランジ稜線部１１（１１ａ、１１ｂ、１１ｃ）は、所定の幅（例えば５〜１０ｍｍ）を持った焼入れ硬化された部位であってもよい。 The outer ridge line portion 10 (10a, 10b, 10c) and the flange ridge line portion 11 (11a, 11b, 11c) of the center pillar reinforcing member 1 of the present embodiment are hardened and hardened by hot pressing, one of them. Thus, the outer plate portion 7, the abdominal plate portion 8 and the flange portion 9 which are other parts are not quenched. The outer ridge line portion 10 and the flange ridge line portion 11 are portions corresponding to bending points of the crank-shaped cross section, and have relatively higher strength than the outer plate portion 7, the abdominal plate portion 8 and the flange portion 9 which are other flat portions. It is a weakened part. In particular, the curved portions in the outer ridge line portion 10a, the outer ridge line portion 10c, the flange ridge line portion 11a, and the funicular ridge line portion 11c are portions that are weak in strength, and are portions that are required to improve strength. In the present invention, the outer ridge line portion 10 (10a, 10b, 10c) and the flange ridge line portion 11 (11a, 11b, 11c), which are weak points in strength, are selectively hardened and hardened by local hot pressing. Thereby, the strength required for the center pillar reinforcing member is ensured. The outer ridge line portion 10 (10a, 10b, 10c) and the flange ridge line portion 11 (11a, 11b, 11c) may be quench-hardened portions having a predetermined width (for example, 5 to 10 mm).

［センターピラー補強部材１の製造方法］
次に、本発明のセンターピラー補強部材１の製造方法について説明する。本発明のセンターピラー補強部材１は、主として鋼板６の加熱工程、プレス成形工程、穴あけ・トリミング工程を経て製造される。そして、プレス成形工程においては、熱間プレス成形法が用いられている。 [Method of Manufacturing Center Pillar Reinforcing Member 1]
Next, the manufacturing method of the center pillar reinforcement member 1 of this invention is demonstrated. The center pillar reinforcing member 1 of the present invention is manufactured mainly through a heating process, a press forming process, a drilling / trimming process of the steel plate 6. In the press molding process, a hot press molding method is used.

鋼板６の加熱工程においては、図３（ａ）に示すように、上部に加熱源として複数の近赤外線ランプ２０が配置された加熱装置２１内に鋼板６が配置され、そして近赤外線ランプ２０と鋼板６との間に熱遮蔽プレート２２が配置された状態で加熱（即ち近赤外線の照射）が行われる。近赤外線ランプ２０の数や強度は特に限定されないが、少なくとも鋼板６の焼入れ予定部位をオーステナイト変態温度Ａｃ_３（例えば９００℃）以上に加熱できるように設定されている。なお、近赤外線の波長λの範囲は、好ましくは０．７６〜３マイクロメートルであり、より好ましくは０．８〜２マイクロメートルである。 In the heating process of the steel plate 6, as shown in FIG. 3A, the steel plate 6 is arranged in a heating device 21 in which a plurality of near infrared lamps 20 are arranged as a heating source in the upper part, and the near infrared lamp 20 and Heating (that is, irradiation of near infrared rays) is performed in a state where the heat shielding plate 22 is disposed between the steel plate 6 and the steel plate 6. The number and intensity of near-infrared lamp 20 is not particularly limited, and is configured to allow heat quenching the proposed site of at least the steel plate 6 above the austenite transformation temperature Ac 3 _(e.g. 900 ° C.). The range of the near infrared wavelength λ is preferably 0.76 to 3 micrometers, and more preferably 0.8 to 2 micrometers.

図３（ｂ）に示すように、熱遮蔽プレート２２は、焼入れ予定部位以外の部位をオーステナイト変態温度Ａｃ_３以上に加熱しないようにするための熱遮蔽部２２ａと、熱遮蔽プレート２２を貫通する平面視線状の切欠き部２２ｂおよび切欠き部２２ｃと、から構成されている。そして、切欠き部２２ｂおよび切欠き部２２ｃは、焼入れ予定部位であるアウタ稜線部１０およびフランジ稜線部１１の形状に合わせてそれぞれ設けられている。 As shown in FIG. 3 (b), the heat shield plate 22 through the portion other than hardened proposed site and the heat-shielding portion 22a for preventing heated to austenite transformation temperature Ac ₃ or more, the thermal shield plates 22 It is composed of a cutout portion 22b and a cutout portion 22c that are in a line of sight. And the notch part 22b and the notch part 22c are each provided according to the shape of the outer ridgeline part 10 and the flange ridgeline part 11 which are quenching plan parts.

近赤外線ランプ２０から発せされた近赤外線は、切欠き部２２ｂおよび切欠き部２２ｃを通過し、プレス加工前の鋼板６のうち、焼入れ予定部位であるアウタ稜線部１０およびフランジ稜線部１１に相当する位置に照射される。その結果、焼入れ予定部位のみを局部的にオーステナイト変態温度Ａｃ_３以上に加熱することができる。 Near-infrared rays emitted from the near-infrared lamp 20 pass through the notch portion 22b and the notch portion 22c, and correspond to the outer ridge line portion 10 and the flange ridge line portion 11 which are the portions to be quenched in the steel plate 6 before press working. It is irradiated to the position to do. As a result, only the part to be quenched can be locally heated to the austenite transformation temperature Ac ₃ or higher.

ここで、熱遮蔽プレート２２は、例えばセラミックス（網目状多孔質セラミックス）や石英ガラスなどのような近赤外線ランプ２０から発せられた近赤外線を部分的に透過又は吸収する材料で作製されていることが好ましい。熱遮蔽プレート２２がこのような材料で構成されていることで、近赤外線ランプ２０から発せられた近赤外線の一部は、熱遮蔽プレート２２（熱遮蔽部２２ａ）を透過し、鋼板６の焼入れ予定部位以外の部位に照射される。即ち、熱遮蔽部２２ａが近赤外線の二次放射源となる。近赤外線ランプ２０から発せられた近赤外線のうち、一部は熱遮蔽部２２ａによって反射および／または吸収されるため、熱遮蔽部２２ａから焼入れ予定部位以外の部位に対して二次放射される近赤外線の強度は、切欠き部２２ｂおよび切欠き部２２ｃを通過して鋼板６に照射される近赤外線の強度よりも弱くなっている。その結果、プレス加工前の鋼板６のうち焼入れ予定部位以外の部位は、オーステナイト変態温度Ａｃ_３未満の温度（例えば６００℃）に加温される。したがって、焼入れ予定部位以外の部位は、焼入れには至らない加温状態でのプレス加工を受けることになる。なお、この焼入れ予定部位以外の部位は、例えば６００℃といったある程度加温された状態でプレス加工が行われるため、プレス加工後におけるスプリングバックなどの問題が発生しなくなる。 Here, the heat shielding plate 22 is made of a material that partially transmits or absorbs near-infrared rays emitted from the near-infrared lamp 20 such as ceramics (reticulated porous ceramics) or quartz glass. Is preferred. Since the heat shielding plate 22 is made of such a material, a part of the near infrared rays emitted from the near infrared lamp 20 is transmitted through the heat shielding plate 22 (heat shielding portion 22a), and the steel plate 6 is quenched. Irradiation is performed on a site other than the planned site. That is, the heat shield 22a becomes a near-infrared secondary radiation source. Since some of the near infrared rays emitted from the near infrared lamp 20 are reflected and / or absorbed by the heat shielding portion 22a, the near infrared rays that are secondarily emitted from the heat shielding portion 22a to a portion other than the portion to be quenched. The intensity of the infrared light is weaker than the intensity of the near infrared light that passes through the notch 22b and the notch 22c and is applied to the steel plate 6. As a result, the part other than the part to be quenched in the steel plate 6 before press working is heated to a temperature (for example, 600 ° C.) lower than the austenite transformation temperature Ac ₃ . Therefore, parts other than the part to be quenched are subjected to press working in a heated state that does not lead to quenching. In addition, since a part other than the part to be quenched is pressed while being heated to some degree, for example, 600 ° C., problems such as a spring back after the pressing are not generated.

プレス成形工程においては、加熱された鋼板６を、加熱された鋼板６よりも低温（例えば室温〜２００℃程度）であるプレス型を用いて、プレス加工を行う。このプレス加工により、柱状部２、上側取付け部３および下側取付け部４には、アウタ板部７、腹板部８およびフランジ部９からなるクランク状の断面形状がそれぞれ付与される。そして、アウタ板部７と腹板部８との境界にアウタ稜線部１０が形成され、腹板部８とフランジ部９との境界にフランジ稜線部１１が形成される。このアウタ稜線部１０およびフランジ稜線部１１は、熱間プレス加工によるオーステナイト変態温度Ａｃ_３以上からの急冷によって焼入れ硬化されることにより、強度が向上する。 In the press forming step, the heated steel plate 6 is pressed using a press die having a temperature lower than that of the heated steel plate 6 (for example, about room temperature to 200 ° C.). By this pressing, the columnar portion 2, the upper mounting portion 3 and the lower mounting portion 4 are each given a crank-like cross-sectional shape including the outer plate portion 7, the abdominal plate portion 8 and the flange portion 9. An outer ridge line portion 10 is formed at the boundary between the outer plate portion 7 and the abdominal plate portion 8, and a flange ridge line portion 11 is formed at the boundary between the abdominal plate portion 8 and the flange portion 9. The outer ridge line portion 10 and the flange ridge line portion 11 are hardened and hardened by quenching from an austenite transformation temperature Ac ₃ or higher by hot pressing, whereby the strength is improved.

穴あけ・トリミング工程においては、図３（ｃ）に示すように、穴あけ用のパンチ型を用いて穴あけ加工を行うとともに、トリミング用の型を用いて不要な部分（図中、仮想線で示す部分）を切除する。このとき、アウタ稜線部１０およびフランジ稜線部１１以外の部位は焼入れされていないため、穴あけ加工やトリミングを施しても支障をきたさない。 In the drilling / trimming step, as shown in FIG. 3 (c), drilling is performed using a punching die for punching and unnecessary portions (portions indicated by phantom lines in the drawing) are used using the trimming die. ). At this time, since parts other than the outer ridge line portion 10 and the flange ridge line portion 11 are not quenched, there is no problem even if drilling or trimming is performed.

［第二実施形態］
本発明のセンターピラー補強部材１の第二実施形態について説明する。なお、第一実施形態と同一の構成については説明を省略する。 [Second Embodiment]
A second embodiment of the center pillar reinforcing member 1 of the present invention will be described. In addition, description is abbreviate | omitted about the structure same as 1st embodiment.

図４および図５に示すように、本実施形態のセンターピラー補強部材１は、柱状部２において、前側のフランジ部９ａから、前側の腹板部８ａ、中央のアウタ板部７および後側の腹板部８ｂを経由して後側のフランジ部９ｂに到る横断線に沿って線状に焼入れされた横断焼入れ硬化部１２が形成されている。なお、この横断焼入れ硬化部１２は、一定の幅（例えば５〜１０ｍｍ）を持った帯状の部位であってもよい。 As shown in FIGS. 4 and 5, the center pillar reinforcing member 1 according to the present embodiment includes, in the columnar part 2, the front side abdomen part 8 a, the center outer plate part 7, and the rear side part from the front flange part 9 a. A transverse hardening and hardening portion 12 is formed which is hardened linearly along a transverse line that reaches the rear flange portion 9b via the abdomen plate portion 8b. In addition, this cross-hardening hardening part 12 may be a strip | belt-shaped site | part with a fixed width | variety (for example, 5-10 mm).

上側取付け部３のアウタ稜線部１０ａとフランジ稜線部１１ａ、並びに、柱状部２のアウタ稜線部１０ｂおよびフランジ稜線部１１ｂのうち横断焼入れ硬化部１２よりも上側の部位は、焼入れ硬化されている。その一方で、柱状部２のアウタ稜線部１０ｂおよびフランジ稜線部１１ｂのうち横断焼入れ硬化部１２よりも下側の部位、並びに、下側取付け部４のアウタ稜線部１０ｃとフランジ稜線部１１ｃは焼入れ硬化されていない。なお、図４において焼入れ硬化されていないアウタ稜線部１０およびフランジ稜線部１１は破線で示されている。 Of the outer ridge line part 10a and the flange ridge line part 11a of the upper mounting part 3, and the outer ridge line part 10b and the flange ridge line part 11b of the columnar part 2, the part above the transverse quenching hardening part 12 is hardened and hardened. On the other hand, of the outer ridge line part 10b and the flange ridge line part 11b of the columnar part 2, the part below the transverse quenching hardening part 12 and the outer ridge line part 10c and the flange ridge line part 11c of the lower attachment part 4 are quenched. Not cured. In FIG. 4, the outer ridge line portion 10 and the flange ridge line portion 11 that are not quenched and hardened are indicated by broken lines.

上記のような構成により、本実施形態のセンターピラー補強部材１では、横断焼入れ硬化部１２よりも上側の部位は高強度部位となり、一方、横断焼入れ硬化部１２よりも下側の部位は相対的に低強度部位となる。そして、焼入れ硬化されたアウタ稜線部１０ｂおよびフランジ稜線部１１ｂと、横断焼入れ硬化部１２とが交差・連結していることで、この交差連結部分を含む横断焼入れ硬化部１２に沿った領域がセンターピラー補強部材１の中で最も強度が高くなる。このため、車両の側面衝突時には、柱状部２の中でも、上記横断焼入れ硬化部１２の下側近傍に位置する部位が相対的に折れ易くなる。すなわち、この横断焼入れ硬化部１２を適切な位置に設けることにより、車両の側面衝突時におけるセンターピラーの変形モードをコントロールすることができる。さらに、本実施形態のセンターピラー補強部材であれば、溶接が必要となるテーラードブランク材と比較して低コストで製造することができる。 With the configuration as described above, in the center pillar reinforcing member 1 of the present embodiment, the portion above the transverse hardening and hardening portion 12 is a high strength portion, while the portion below the transverse hardening and hardening portion 12 is relative. It becomes a low strength part. Then, the outer ridge line portion 10b and the flange ridge line portion 11b that have been hardened and hardened, and the transverse hardening and hardening portion 12 intersect and are connected, so that the region along the transverse hardening and hardening portion 12 including the cross-linking portion is the center. The strength is highest among the pillar reinforcing members 1. For this reason, at the time of a side collision of the vehicle, a part of the columnar part 2 located near the lower side of the transverse hardening and hardening part 12 is relatively easily broken. That is, the deformation mode of the center pillar at the time of a side collision of the vehicle can be controlled by providing the transverse hardening and hardening portion 12 at an appropriate position. Furthermore, if it is a center pillar reinforcement member of this embodiment, it can manufacture at low cost compared with the tailored blank material which requires welding.

第二実施形態のセンターピラー補強部材１の製造方法は、概ね第一実施形態のセンターピラー補強部材１の製造方法と同じである。図６には、第二実施形態のセンターピラー補強部材１の製造に用いられる熱遮蔽プレート２２が示されている。第二実施形態で使用される熱遮蔽プレート２２は、焼入れ予定部位以外の部位をオーステナイト変態温度Ａｃ_３（例えば９００℃）以上に加熱しないようにするための熱遮蔽部２２ａと、熱遮蔽プレート２２を貫通する平面視線状の切欠き部２２ｂ、切欠き部２２ｃおよび切欠き部２２ｄとから構成されている。切欠き部２２ｂ、切欠き部２２ｃおよび切欠き部２２ｄは、焼入れ予定部位であるアウタ稜線部１０、フランジ稜線部１１および横断焼入れ硬化部１２の形状に合わせてそれぞれ設けられている。 The manufacturing method of the center pillar reinforcing member 1 of the second embodiment is substantially the same as the manufacturing method of the center pillar reinforcing member 1 of the first embodiment. FIG. 6 shows a heat shielding plate 22 used for manufacturing the center pillar reinforcing member 1 of the second embodiment. The heat shielding plate 22 used in the second embodiment includes a heat shielding portion 22a for preventing a part other than the part to be quenched from being heated to an austenite transformation temperature Ac ₃ (for example, 900 ° C.) or higher, and the heat shielding plate 22. The cut-out portion 22b, the cut-out portion 22c, and the cut-out portion 22d have a line-of-view in a plan view. The notch portion 22b, the notch portion 22c, and the notch portion 22d are provided in accordance with the shapes of the outer ridge line portion 10, the flange ridge line portion 11, and the transverse hardening and hardening portion 12, which are the portions to be quenched.

近赤外線ランプ２０から発せられた近赤外線は、切欠き部２２ｂ、切欠き部２２ｃおよび切欠き部２２ｄを通過し、プレス加工前の鋼板６のうち、焼入れ予定部位であるアウタ稜線部１０、フランジ稜線部１１および横断焼入れ硬化部１２に相当する位置に照射される。その結果、焼入れ予定部位のみを局部的にオーステナイト変態温度Ａｃ_３以上に加熱することができる。そして、それらの各部位は、熱間プレス加工によるオーステナイト変態温度Ａｃ_３以上からの急冷によって焼入れ硬化されることにより、強度が向上する。 Near-infrared rays emitted from the near-infrared lamp 20 pass through the notch portion 22b, the notch portion 22c and the notch portion 22d, and the outer ridge line portion 10 and the flange, which are to be quenched, of the steel plate 6 before press working. Irradiation is performed at positions corresponding to the ridge line portion 11 and the transverse hardening and hardening portion 12. As a result, only the part to be quenched can be locally heated to the austenite transformation temperature Ac ₃ or higher. Then, each of those sites, by being quench hardened by quenching from the austenite transformation temperature Ac ₃ or more by hot pressing, strength is improved.

［その他の実施形態］
鋼板６の加熱工程において、焼入れ予定部位とそれ以外の部位との温度差を大きくすることで、熱が高温側（焼入れ予定部位側）から低温側（焼入れ予定部位以外の部位側）へ移動し、それに伴って温度徐変部位が広くなる。その結果、成形加工後におけるセンターピラー補強部材１の強度変遷部位も広くなる。このように、鋼板６の加熱の際に、焼入れ予定部位とそれ以外の部位との温度差を適宜調節することにより、所望の強度分布を有するセンターピラー補強部材１を製造することが可能となる。 [Other Embodiments]
In the heating process of the steel plate 6, by increasing the temperature difference between the part to be quenched and the other part, the heat moves from the high temperature side (the part to be quenched) to the low temperature side (the part other than the part to be quenched). Along with this, the temperature gradually changing portion becomes wide. As a result, the strength transition part of the center pillar reinforcing member 1 after the forming process is also widened. Thus, when the steel plate 6 is heated, the center pillar reinforcing member 1 having a desired strength distribution can be manufactured by appropriately adjusting the temperature difference between the part to be quenched and the other part. .

上記実施形態では、上側取付け部３および下側取付け部４を柱状部２に対して車両前後方向に張り出し形成したが、上側取付け部３および／または下側取付け部４を張り出さないように形成してもよい。 In the above embodiment, the upper mounting portion 3 and the lower mounting portion 4 are formed so as to project from the columnar portion 2 in the vehicle front-rear direction, but the upper mounting portion 3 and / or the lower mounting portion 4 are formed so as not to project. May be.

本発明は上記実施形態に限られず、本発明の趣旨を逸脱しない範囲で適宜変更可能である。 The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

１センターピラー補強部材
２柱状部
３上側取付け部
４下側取付け部
５貫通孔
６鋼板
７アウタ板部
８腹板部
９フランジ部
１０アウタ稜線部
１０ａ上側取付け部のアウタ稜線部
１０ｂ柱状部のアウタ稜線部
１０ｃ下側取付け部のアウタ稜線部
１１フランジ稜線部
１１ａ上側取付け部のフランジ稜線部
１１ｂ柱状部のフランジ稜線部
１１ｃ下側取付け部のフランジ稜線部
１２横断焼入れ硬化部
２０近赤外線ランプ
２１加熱装置
２２熱遮蔽プレート
２２ａ熱遮蔽部
２２ｂ切欠き部
２２ｃ切欠き部
２２ｄ切欠き部 DESCRIPTION OF SYMBOLS 1 Center pillar reinforcement member 2 Columnar part 3 Upper attachment part 4 Lower attachment part 5 Through-hole 6 Steel plate 7 Outer plate part 8 Abdomen plate part 9 Flange part 10 Outer ridgeline part 10a Outer ridgeline part 10b of upper attachment part Outer of columnar part Edge line portion 10c Outer ridge line portion 11 of lower attachment portion Flange ridge line portion 11a Flange ridge line portion 11b of upper attachment portion Flange ridge line portion 11c of columnar portion Flange ridge line portion 12 of lower attachment portion Transverse quenching hardening portion 20 Near infrared lamp 21 Heating Device 22 Heat shield plate 22a Heat shield 22b Notch 22c Notch 22d Notch

Claims

A columnar portion, an upper mounting portion formed in the vehicle front-rear direction at the upper end of the columnar portion to be connected to the roof side rail, and a lower portion formed in the vehicle front-rear direction at the lower end of the columnar portion to be connected to the side sill. A side mounting portion,
The columnar portion, the upper mounting portion, and the lower mounting portion are integrally formed by pressing a steel plate, and at least one of each of the columnar portion, the upper mounting portion, and the lower mounting portion is provided. In the portion, a center pillar reinforcing member formed by the press working with a crank-shaped cross-sectional shape composed of an outer plate portion, a belly plate portion and a flange portion,
At the boundary between the outer plate portion and the abdominal plate portion, an outer ridge line portion is formed,
At the boundary between the abdominal plate portion and the flange portion, a flange ridge line portion is formed,
The outer ridge line portion of the upper mounting portion extends while curving so as to gradually change the direction from the vehicle longitudinal direction to the vehicle height direction, and is continuous with the outer ridge line portion of the columnar portion extending in the vehicle height direction,
The flange ridge line portion of the upper mounting portion extends while curving so as to gradually change the direction from the vehicle longitudinal direction to the vehicle height direction, and is continuous with the flange ridge line portion of the columnar portion extending in the vehicle height direction,
The upper mounting portion and the outer ridge portion and the flange ridge of the columnar portion localized hot are quench hardened by press working, the outer plate portion of the upper mounting portion and the columnar portion, webs portion and the flange portion Is a center pillar reinforcing member, which is not hardened by hardening .

The outer ridge line part and the flange ridge line part in the columnar part are hardened and hardened over the entire length in the vehicle height direction, and the outer ridge line part and the flange ridge line part in the lower attachment part are also hardened and hardened by local hot pressing. The outer ridge line portion and the flange ridge line portion in the columnar portion that has been hardened and hardened are continuous with the outer ridge line portion and the flange ridge line portion in the lower attachment portion that have been hardened and hardened, respectively. The center pillar reinforcing member according to 1.

The columnar portion includes a local line along a transverse line from the front flange portion to the rear flange portion via the front abdominal plate portion, the central outer plate portion, and the rear abdominal plate portion. A linear or belt-like transverse quenching hardened part that is hardened and hardened by hot pressing is formed,
2. The center pillar reinforcing member according to claim 1, wherein the linear or belt-like transverse quenching and hardening portion intersects the outer ridge line portion and the flange ridge line portion in the quench-hardened columnar portion.

Of the outer ridge line part and flange ridge line part of the columnar part, the lower part of the transverse quenching hardening part, and the outer ridge line part and flange ridge line part of the lower mounting part are not hardened by hardening. The center pillar reinforcing member according to claim 3.

Before Symbol localized hot pressing is accomplished with local heating by NIR irradiation for hardening the proposed site of the previous steel sheet stamping, by the pressing of the locally heated steel sheet, it The center pillar reinforcing member according to any one of claims 1 to 4, wherein: