JP2020168649A - Press molded product manufacturing method - Google Patents

Press molded product manufacturing method Download PDF

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JP2020168649A
JP2020168649A JP2019071805A JP2019071805A JP2020168649A JP 2020168649 A JP2020168649 A JP 2020168649A JP 2019071805 A JP2019071805 A JP 2019071805A JP 2019071805 A JP2019071805 A JP 2019071805A JP 2020168649 A JP2020168649 A JP 2020168649A
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steel plate
main body
blank
reinforcing steel
body steel
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JP6824317B2 (en
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康剛 鈴木
Yasutaka Suzuki
康剛 鈴木
方紀 岡崎
Masanori Okazaki
方紀 岡崎
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Toa Kogyo Co Ltd
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Abstract

To manufacture a press molded product comprising a laminated blank in which a body steel plate has a high strength and a reinforcement steel plate has a high ductility.SOLUTION: A body steel plate 1 and a reinforcement steel plate 2 are heated by a first heating furnace 3 and a second heating furnace 4 respectively (Process S1). Then, the reinforcement steel plate 2 is taken out to the exterior from the second heating furnace 4 (process S2). Then, the body steel plate 1 is taken out to the exterior from the first heating furnace 3 (process S3). Then, the reinforcement steel plate 2 is overlapped on the body steel plate 1, thereby forming a laminated blank 10, and this laminated blank 10 is set onto a lower metal mold of a press device 5 (process S4). Then, the laminated blank 10 is sandwiched between the lower metal mold and an upper metal mold of the press device 5 and is press-molded, and at the same time, is quickly cooled (process S5). Thereafter, overlapped parts of the laminated blank 10 are welded (process S6).SELECTED DRAWING: Figure 1

Description

本発明は、プレス成形品の製造方法に関し、特に本体鋼板に補強鋼板を重ね合わせてなる重ね合わせブランクの製造方法に関する。 The present invention relates to a method for producing a press-formed product, and more particularly to a method for producing a laminated blank obtained by superimposing a reinforcing steel plate on a main body steel plate.

一般に、熱間プレスとは鋼板をオーステナイト変態温度以上の温度に加熱し、これを上下方向に対向して配置された２つの金型の間に挟んで押圧し、プレス成形すると同時に金型による急冷により鋼板の金属組織をオーステナイトからマルテンサイトに変態せしめることで、鋼板の焼入れ強化を行うものである。 Generally, a hot press heats a steel sheet to a temperature equal to or higher than the austenite transformation temperature, sandwiches it between two dies arranged facing each other in the vertical direction, presses it, press-molds it, and quenches it with the dies. By transforming the metallographic structure of the steel sheet from austenite to martensite, the steel sheet is hardened and strengthened.

特許文献１には、ピラーレインフォースメント等の自動車車体部品（自動車ボディを構成する部品）において、その機械的強度を局部的に高めるために、本体鋼板に補強鋼板を重ね合わせ、スポット溶接で両鋼板を接合することで重ね合わせブランクを形成し、この重ね合わせブランクを熱間プレスする方法が記載されている。 In Patent Document 1, in order to locally increase the mechanical strength of automobile body parts (parts constituting an automobile body) such as pillar reinforcement, a reinforcing steel plate is superposed on the main body steel plate, and both are spot-welded. A method of forming a superposed blank by joining steel plates and hot-pressing the superposed blank is described.

特開２０１４−１９３７１２号公報Japanese Unexamined Patent Publication No. 2014-193712

しかしながら、特許文献１に記載された発明では、重ね合わせブランクをフェライト変態開始温度（Ａｒ３）以上の温度から急冷するので、本体鋼板及び補強鋼板の両鋼板が焼き入れにより強化され、補強鋼板の延性が低くなるという問題があった。 However, in the invention described in Patent Document 1, since the laminated blank is rapidly cooled from a temperature equal to or higher than the ferrite transformation start temperature (Ar3), both the main steel plate and the reinforcing steel plate are strengthened by quenching, and the ductility of the reinforcing steel plate is increased. There was a problem that it became low.

上述した課題に鑑み、本発明のプレス成形品の製造方法は、本体鋼板及び補強鋼板をそれぞれ第１及び第２の加熱炉で加熱する工程と、前記補強鋼板を前記第２の加熱炉から取り出した後に前記本体鋼板を前記第１の加熱炉から取り出して前記補強鋼板及び前記本体鋼板をそれぞれ自然冷却する工程と、前記本体鋼板と前記補強鋼板を重ね合わせることにより、重ね合わせブランクとする工程と、前記重ね合わせブランクを金型でプレス成形すると同時に急冷するプレス工程と、前記重ね合わせブランクを前記金型から取り出し、前記重ね合わせブランクの重ね合わせ部を溶接する工程と、を備え、
前記プレス工程において、前記本体鋼板はフェライト変態開始温度（Ａｒ３）より高い温度から急冷し、前記補強鋼板はフェライト変態開始温度（Ａｒ３）より低い温度から急冷することを特徴とする。 In view of the above-mentioned problems, in the method for producing a press-formed product of the present invention, a step of heating the main body steel plate and the reinforcing steel plate in the first and second heating furnaces, respectively, and taking out the reinforcing steel plate from the second heating furnace. After that, the main body steel plate is taken out from the first heating furnace to naturally cool the reinforcing steel plate and the main body steel plate, respectively, and the main body steel plate and the reinforcing steel plate are overlapped to form a laminated blank. A step of pressing the laminated blank at the same time as press molding with a mold and a step of taking out the laminated blank from the mold and welding the overlapped portion of the laminated blank are provided.
In the pressing step, the main body steel sheet is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), and the reinforced steel sheet is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3).

本発明によれば、重ね合わせブランクにおいて、本体鋼板は焼き入れにより高い強度が得られるとともに、補強鋼板については焼き入れが抑制されるため高延性を得ることができる。これにより、プレス製品（重ね合わせブランク）に衝撃が加わり、本体鋼板が破断する場合でも、補強鋼板が延びて追従するため、プレス成形品（重ね合わせブランク）の分断を防止することができる。 According to the present invention, in the laminated blank, the main body steel plate can obtain high strength by quenching, and the reinforcing steel plate can obtain high ductility because quenching is suppressed. As a result, even when an impact is applied to the pressed product (lapped blank) and the main body steel plate breaks, the reinforcing steel plate extends and follows, so that the press-formed product (lapped blank) can be prevented from being divided.

本発明の実施形態におけるプレス成形品の製造工程を示す図である。It is a figure which shows the manufacturing process of the press-molded article in embodiment of this invention. 本発明の実施形態におけるプレス成形品の製造フローを示す図である。It is a figure which shows the manufacturing flow of the press-molded article in embodiment of this invention. 本発明の実施形態における本体鋼板及び補強鋼板の温度変化を示す図である。It is a figure which shows the temperature change of the main body steel plate and the reinforcing steel plate in embodiment of this invention.

本発明の実施形態におけるプレス成形品の製造方法を図１乃至図３に基づいて説明する。 The method for producing a press-formed product according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

先ず、工程Ｓ１において、本体鋼板１及び補強鋼板２をそれぞれ第１の加熱炉３及び第２の加熱炉４でオーステナイト変態温度（Ａｃ３）以上の温度Ｔ０に加熱する。オーステナイト変態温度（Ａｃ３）は鋼板の炭素含有量によっても異なるが、例えば８７０℃である。これにより、本体鋼板１及び補強鋼板２の金属組織は、オーステナイトになる。 First, in step S1, the main body steel plate 1 and the reinforcing steel plate 2 are heated to a temperature T0 equal to or higher than the austenite transformation temperature (Ac3) in the first heating furnace 3 and the second heating furnace 4, respectively. The austenite transformation temperature (Ac3) varies depending on the carbon content of the steel sheet, but is, for example, 870 ° C. As a result, the metallographic structure of the main body steel plate 1 and the reinforcing steel plate 2 becomes austenite.

次に、工程Ｓ２において、時刻ｔ１で補強鋼板２を第２の加熱炉４から外部に取り出す。第２の加熱炉４から取り出された補強鋼板２はプレス装置５への搬送中に常温大気中で自然冷却され、その温度Ｔ２はＴ０から低下していく。
その後、工程Ｓ３において、時刻ｔ２（ｔ２＞ｔ１）で本体鋼板１を第１の加熱炉３から外部に取り出す。第１の加熱炉３から取り出された本体鋼板１もプレス装置５への搬送中に常温大気中で自然冷却され、その温度Ｔ１はＴ０から低下していく。 Next, in step S2, the reinforcing steel plate 2 is taken out from the second heating furnace 4 at time t1. The reinforcing steel plate 2 taken out from the second heating furnace 4 is naturally cooled in the air at room temperature during transportation to the press device 5, and its temperature T2 decreases from T0.
Then, in step S3, the main body steel plate 1 is taken out from the first heating furnace 3 at time t2 (t2> t1). The main body steel plate 1 taken out from the first heating furnace 3 is also naturally cooled in the air at room temperature during transportation to the press device 5, and its temperature T1 decreases from T0.

その後、工程Ｓ４において、時刻ｔ３（ｔ３＞ｔ２）で、プレス装置５の下金型の上で、本体鋼板１の上に補強鋼板２を重ね合わせることにより、重ね合わせブランク１０を形成する。この場合、補強鋼板２は本体鋼板１よりも先の時刻ｔ１で取り出されているために、その分、冷却時間が長くなっている。補強鋼板２の冷却時間はｔ３−ｔ１、本体鋼板１の冷却時間はｔ３−ｔ２である。 Then, in step S4, at time t3 (t3> t2), the reinforcing steel plate 2 is superposed on the main body steel plate 1 on the lower die of the press device 5, to form the superposed blank 10. In this case, since the reinforcing steel plate 2 is taken out at the time t1 earlier than the main body steel plate 1, the cooling time is lengthened by that amount. The cooling time of the reinforcing steel plate 2 is t3-t1, and the cooling time of the main body steel plate 1 is t3-t2.

そのため、図３に示すように、時刻ｔ３では、本体鋼板１の温度Ｔ１はフェライト変態開始温度（Ａｒ３）より高くなっており、補強鋼板２の温度Ｔ２はフェライト変態開始温度（Ａｒ３）より低くなっているという状態を作り出すことができる。この段階では、重ね合わせブランク１０の重ね合わせ部は溶接していない。なお、上述の各鋼板１，２の冷却時間は、鋼板の厚さ等によって異なるが、予め実験を行うことにより設定することがきる。 Therefore, as shown in FIG. 3, at time t3, the temperature T1 of the main body steel plate 1 is higher than the ferrite transformation start temperature (Ar3), and the temperature T2 of the reinforcing steel plate 2 is lower than the ferrite transformation start temperature (Ar3). You can create a state of being. At this stage, the superposed portion of the superposed blank 10 is not welded. The cooling time of each of the above-mentioned steel plates 1 and 2 varies depending on the thickness of the steel plate and the like, but can be set by conducting an experiment in advance.

その後、工程Ｓ５において、重ね合わせブランク１０をプレス装置５の下金型と上金型の間に挟んでプレス成形すると同時にマルテンサイト変態開始温度（Ｍｓ）以下の温度まで急冷する。この場合、本体鋼板１についてはフェライト変態開始温度（Ａｒ３）より高い温度から急冷されることからマルテンサイト変態が生じ、１．５ＧＰａ以上の高い引張強度が得られる。 Then, in step S5, the superposed blank 10 is sandwiched between the lower die and the upper die of the press device 5 and press-formed, and at the same time, it is rapidly cooled to a temperature equal to or lower than the martensitic transformation start temperature (Ms). In this case, the main body steel sheet 1 is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), so that martensitic transformation occurs and a high tensile strength of 1.5 GPa or more can be obtained.

一方、補強鋼板２については、フェライト変態開始温度（Ａｒ３）より低い温度から急冷されることから、マルテンサイト変態が抑制されるため、高延性を得ることができる。 On the other hand, since the reinforcing steel sheet 2 is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3), the martensitic transformation is suppressed, so that high ductility can be obtained.

その後、金型を開放して、重ね合わせブランク１０を取り出し、重ね合わせブランク１０の重ね合わせ部における本体鋼板１と補強鋼板２を溶接する。この場合、重ね合わせブランク１０はハット形等の３次元形状にプレス成形されているため、溶接箇所の自由度が高いレーザー溶接を行うことが好ましい。その後、ナット等の締結部材を補強鋼板２に抵抗溶接する。 After that, the mold is opened, the superposed blank 10 is taken out, and the main body steel plate 1 and the reinforcing steel plate 2 at the superposed portion of the superposed blank 10 are welded. In this case, since the laminated blank 10 is press-formed into a three-dimensional shape such as a hat shape, it is preferable to perform laser welding with a high degree of freedom in the welded portion. After that, a fastening member such as a nut is resistance welded to the reinforcing steel plate 2.

ここで、改めて本実形態の製造方法と従来の製造方法を対比すると、従来のように、重ね合わせブランク１０をフェライト変態開始温度（Ａｒ３）以上の温度から急冷する方法では本体鋼板１及び補強鋼板２の両鋼板が焼き入れにより強化されるので、補強鋼板２の延性が低くなってしまう。 Here, when the manufacturing method of the present embodiment and the conventional manufacturing method are compared again, the main body steel plate 1 and the reinforcing steel plate are obtained by quenching the laminated blank 10 from a temperature equal to or higher than the ferrite transformation start temperature (Ar3) as in the conventional method. Since both steel plates of No. 2 are strengthened by quenching, the ductility of the reinforcing steel plate 2 is lowered.

この場合、重ね合わせブランク１０における本体鋼板１と補強鋼板２との重ね合わせ部は熱容量が大きいため、温度低下が遅くなる。そのため、従来のように、あらかじめ抵抗溶接で接合した重ね合わせブランク１０を加熱し、これを自然冷却するという方法では、プレス時に本体鋼板１の温度をフェライト変態開始温度（Ａｒ３）より高くしながら、補強鋼板２の温度をフェライト変態開始温度（Ａｒ３）より低くすることはできない。 In this case, since the superposed portion of the main body steel plate 1 and the reinforcing steel plate 2 in the superposed blank 10 has a large heat capacity, the temperature drop becomes slow. Therefore, as in the conventional method, in the method of heating the laminated blank 10 previously joined by resistance welding and naturally cooling it, the temperature of the main body steel plate 1 is set higher than the ferrite transformation start temperature (Ar3) at the time of pressing. The temperature of the reinforcing steel plate 2 cannot be made lower than the ferrite transformation start temperature (Ar3).

一方、補強鋼板２として特殊な高延性鋼板を用いれば、フェライト変態開始温度（Ａｒ３）より高い温度から急冷した場合でも高延性を得ることができるが、鋼板の種類に制約が生じ、コストが高くなるという問題がある。 On the other hand, if a special high ductility steel sheet is used as the reinforcing steel sheet 2, high ductility can be obtained even when quenching from a temperature higher than the ferrite transformation start temperature (Ar3), but the type of steel sheet is restricted and the cost is high. There is a problem of becoming.

これに対して、本実施形態の製造方法によれば、本体鋼板１と補強鋼板２の冷却時間に差を設けているので、プレス時に補強鋼板２の温度をＡｒ３より低くすることができ、補強鋼板２として、特に制限なく様々な鋼板を使用することができる。 On the other hand, according to the manufacturing method of the present embodiment, since the cooling time of the main body steel plate 1 and the reinforcing steel plate 2 is different, the temperature of the reinforcing steel plate 2 can be made lower than that of Ar3 at the time of pressing, and the reinforcing steel plate 2 is reinforced. As the steel plate 2, various steel plates can be used without particular limitation.

また、上述の実施形態では、本体鋼板１及び補強鋼板２をそれぞれ第１の加熱炉３及び第２の加熱炉４で加熱しているため、それぞれの鋼板に適した加熱条件を設定することができる。 Further, in the above-described embodiment, since the main body steel plate 1 and the reinforcing steel plate 2 are heated in the first heating furnace 3 and the second heating furnace 4, respectively, it is possible to set heating conditions suitable for each steel plate. it can.

これに対して、２台の加熱炉３，４を用いるのではなく、１台の加熱炉を用いることもできる。この場合、本体鋼板１及び補強鋼板２を１台の加熱炉で加熱し、同様に時間差をもって、本体鋼板１及び補強鋼板２を加熱炉から取り出し、プレス時に本体鋼板１の温度をフェライト変態開始温度（Ａｒ３）より高くし、補強鋼板２の温度をフェライト変態開始温度（Ａｒ３）より低くすることができる。そして、この状態からプレス成形及び急冷することにより、同等の特性を有したプレス成形品を得ることができる。 On the other hand, instead of using two heating furnaces 3 and 4, one heating furnace can also be used. In this case, the main body steel plate 1 and the reinforcing steel plate 2 are heated in one heating furnace, the main body steel plate 1 and the reinforcing steel plate 2 are taken out from the heating furnace with a time difference, and the temperature of the main body steel plate 1 is set to the ferrite transformation start temperature at the time of pressing. It can be made higher than (Ar3) and the temperature of the reinforcing steel sheet 2 can be made lower than the ferrite transformation start temperature (Ar3). Then, by press molding and quenching from this state, a press molded product having the same characteristics can be obtained.

また、逆に、本体鋼板１に高い延性を、補強鋼板２に高強度を持たせたい場合がある。例えば、本体鋼板１とアルミニウムで形成された部品とを接合する場合にはスポット溶接ができないため、機械接合が必要となる。この場合、熱間プレスされた本体鋼板１の引張強度が例えば１．５ＧＰａと高いと機械接合ができないため、本体鋼板１については強度を下げる必要がある。 On the contrary, there are cases where it is desired that the main body steel plate 1 has high ductility and the reinforcing steel plate 2 has high strength. For example, when joining the main body steel plate 1 and a part made of aluminum, spot welding is not possible, so mechanical joining is required. In this case, if the tensile strength of the hot-pressed main body steel sheet 1 is as high as 1.5 GPa, mechanical joining cannot be performed, so it is necessary to reduce the strength of the main body steel sheet 1.

このような場合、上述の実施形態において、加熱炉３，４もしくは１台の加熱炉から本体鋼板１及び補強鋼板２を取出す順序を逆に変更することで対応することができる。すなわち、本体鋼板１を取り出した後に補強鋼板２を取り出す。そして、プレス工程において、補強鋼板２をフェライト変態開始温度（Ａｒ３）より高い温度から急冷し、本体鋼板１をフェライト変態開始温度（Ａｒ３）より低い温度から急冷することで、本体鋼板１に高い延性を、補強鋼板２に高強度を持たせることができる。 In such a case, in the above-described embodiment, the order of taking out the main body steel plate 1 and the reinforcing steel plate 2 from the heating furnaces 3, 4 or one heating furnace can be changed in reverse. That is, after taking out the main body steel plate 1, the reinforcing steel plate 2 is taken out. Then, in the pressing process, the reinforcing steel sheet 2 is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), and the main body steel sheet 1 is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3), so that the main body steel sheet 1 has high ductility. , The reinforcing steel plate 2 can be provided with high strength.

１ 本体鋼板
２ 補強鋼板
３ 第１の加熱炉
４ 第２の加熱炉
５ プレス装置
１０ 重ね合わせブランク 1 Main body steel plate 2 Reinforced steel plate 3 First heating furnace 4 Second heating furnace 5 Pressing device 10 Overlapping blank

Claims (6)

本体鋼板及び補強鋼板をそれぞれ第１及び第２の加熱炉で加熱する工程と、
前記補強鋼板を前記第２の加熱炉から取り出した後に前記本体鋼板を前記第１の加熱炉から取り出して前記補強鋼板及び前記本体鋼板をそれぞれ自然冷却する工程と、
前記本体鋼板と前記補強鋼板を重ね合わせることにより、重ね合わせブランクとする工程と、
前記重ね合わせブランクを金型でプレス成形すると同時に急冷するプレス工程と、
前記重ね合わせブランクを前記金型から取り出し、前記重ね合わせブランクの重ね合わせ部を溶接する工程と、を備え、
前記プレス工程において、前記本体鋼板はフェライト変態開始温度（Ａｒ３）より高い温度から急冷し、前記補強鋼板はフェライト変態開始温度（Ａｒ３）より低い温度から急冷することを特徴とするプレス成形品の製造方法。 The process of heating the main body steel plate and the reinforced steel plate in the first and second heating furnaces, respectively.
A step of taking out the reinforcing steel plate from the second heating furnace and then taking out the main body steel plate from the first heating furnace to naturally cool the reinforcing steel plate and the main body steel plate, respectively.
A process of superimposing the main body steel plate and the reinforcing steel plate to form a superposed blank.
A press process in which the laminated blank is press-molded with a die and at the same time rapidly cooled.
A step of taking out the superposed blank from the mold and welding the superposed portion of the superposed blank is provided.
In the pressing step, the main body steel sheet is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), and the reinforced steel sheet is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3). Method. 本体鋼板及び補強鋼板を１台の加熱炉で加熱する工程と、
前記補強鋼板を前記加熱炉から取り出した後に、前記本体鋼板を前記加熱炉から取り出して、前記補強鋼板及び前記本体鋼板をそれぞれ自然冷却する工程と、
前記本体鋼板と前記補強鋼板を重ね合わせることにより、重ね合わせブランクとする工程と、
前記重ね合わせブランクを金型でプレス成形すると同時に急冷するプレス工程と、
前記重ね合わせブランクを前記金型から取り出し、前記重ね合わせブランクの重ね合わせ部を溶接する工程と、を備え、
前記プレス工程において、前記本体鋼板はフェライト変態開始温度（Ａｒ３）より高い温度から急冷し、前記補強鋼板はフェライト変態開始温度（Ａｒ３）より低い温度から急冷することを特徴とするプレス成形品の製造方法。 The process of heating the main body steel plate and the reinforcing steel plate in one heating furnace,
A step of taking out the reinforcing steel plate from the heating furnace, then taking out the main body steel plate from the heating furnace, and naturally cooling the reinforcing steel plate and the main body steel plate, respectively.
A process of superimposing the main body steel plate and the reinforcing steel plate to form a superposed blank.
A press process in which the laminated blank is press-molded with a die and at the same time rapidly cooled.
A step of taking out the superposed blank from the mold and welding the superposed portion of the superposed blank is provided.
In the pressing step, the main body steel sheet is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), and the reinforced steel sheet is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3). Method. 本体鋼板及び補強鋼板をそれぞれ第１及び第２の加熱炉で加熱する工程と、
前記本体鋼板を前記第１の加熱炉から取り出した後に前記補強鋼板を前記第２の加熱炉から取り出して前記補強鋼板及び前記本体鋼板をそれぞれ自然冷却する工程と、
前記本体鋼板と前記補強鋼板を重ね合わせることにより、重ね合わせブランクとする工程と、
前記重ね合わせブランクを金型でプレス成形すると同時に急冷するプレス工程と、
前記重ね合わせブランクを前記金型から取り出し、前記重ね合わせブランクの重ね合わせ部を溶接する工程と、を備え、
前記プレス工程において、前記補強鋼板はフェライト変態開始温度（Ａｒ３）より高い温度から急冷し、前記本体鋼板はフェライト変態開始温度（Ａｒ３）より低い温度から急冷することを特徴とするプレス成形品の製造方法。 The process of heating the main body steel plate and the reinforced steel plate in the first and second heating furnaces, respectively.
A step of taking out the main body steel plate from the first heating furnace and then taking out the reinforcing steel plate from the second heating furnace to naturally cool the reinforcing steel plate and the main body steel plate, respectively.
A process of superimposing the main body steel plate and the reinforcing steel plate to form a superposed blank.
A press process in which the laminated blank is press-molded with a die and at the same time rapidly cooled.
A step of taking out the superposed blank from the mold and welding the superposed portion of the superposed blank is provided.
In the pressing step, the reinforcing steel sheet is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), and the main body steel sheet is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3). Method. 本体鋼板及び補強鋼板を１台の加熱炉で加熱する工程と、
前記本体鋼板を前記加熱炉から取り出した後に、前記補強鋼板を前記加熱炉から取り出して、前記補強鋼板及び前記本体鋼板をそれぞれ自然冷却する工程と、
前記本体鋼板と前記補強鋼板を重ね合わせることにより、重ね合わせブランクとする工程と、
前記重ね合わせブランクを金型でプレス成形すると同時に急冷するプレス工程と、
前記重ね合わせブランクを前記金型から取り出し、前記重ね合わせブランクの重ね合わせ部を溶接する工程と、を備え、
前記プレス工程において、前記補強鋼板はフェライト変態開始温度（Ａｒ３）より高い温度から急冷し、前記本体鋼板はフェライト変態開始温度（Ａｒ３）より低い温度から急冷することを特徴とするプレス成形品の製造方法。 The process of heating the main body steel plate and the reinforcing steel plate in one heating furnace,
A step of taking out the main body steel plate from the heating furnace, then taking out the reinforcing steel plate from the heating furnace, and naturally cooling the reinforcing steel plate and the main body steel plate, respectively.
A process of superimposing the main body steel plate and the reinforcing steel plate to form a superposed blank.
A press process in which the laminated blank is press-molded with a die and at the same time rapidly cooled.
A step of taking out the superposed blank from the mold and welding the superposed portion of the superposed blank is provided.
In the pressing step, the reinforcing steel sheet is rapidly cooled from a temperature higher than the ferrite transformation start temperature (Ar3), and the main body steel sheet is rapidly cooled from a temperature lower than the ferrite transformation start temperature (Ar3). Method. 前記溶接はレーザー溶接であることを特徴とする請求項１乃至４のいずれかに記載のプレス成形品の製造方法。 The method for producing a press-molded product according to any one of claims 1 to 4, wherein the welding is laser welding. 前記重ね合わせブランクの重ね合わせ部を溶接した後に、前記補強鋼板に締結部材を抵抗溶接する工程を備えることを特徴とする請求項１乃至５のいずれかに記載のプレス成形品の製造方法。 The method for manufacturing a press-formed product according to any one of claims 1 to 5, further comprising a step of resistance welding a fastening member to the reinforcing steel plate after welding the superposed portion of the superposed blank.
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