JP5942606B2 - Warm press molding method and molding die having groove shape on the mold surface used therefor - Google Patents
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Description
本発明は、加熱した鋼板（ブランク）をプレス成形する温間プレス成形において、成形時に鋼板と金型との接触部と非接触部とに温度差が生じ、これにより金型離型後に発生する形状変化を抑制し、プレス成形後に寸法精度の良好なパネル形状を得る方法に関する。 In the present invention, in warm press forming for press forming a heated steel plate (blank), a temperature difference is generated between a contact portion and a non-contact portion between the steel plate and the mold during forming, and thus occurs after mold release. The present invention relates to a method of suppressing a change in shape and obtaining a panel shape with good dimensional accuracy after press molding.
燃費向上を目的とした車体の軽量化と、乗員保護のための衝突安全性向上を両立させるため、車両部品への高強度鋼板の適用が進められている。しかしながら、高強度鋼板は一般にプレス成形性に劣り、金型離型後の弾性回復による形状変化（スプリングバック）が大きくて寸法精度不良が発生しやすいため、適用部品が限定されているのが現状である。そのため、プレス成形性の改善およびプレス成形後の形状凍結性向上を狙いとして、ブランクを所定の温度に加熱した後にプレス成形する、特許文献１などに記載される温間プレス成形が適用されている。温間プレス成形は冷間プレス成形よりも高い温度で成形することによって、鋼板の変形抵抗を低下させて変形能を向上させ、プレス時の割れなどの不具合を防止するとともに、成形後の形状凍結性（ブランクをプレス成形したパネルの形状が金型形状を保持する特性）を向上させる技術である。 High-strength steel sheets are being applied to vehicle parts in order to achieve both weight reduction of the vehicle body for the purpose of improving fuel efficiency and improvement of collision safety for occupant protection. However, high-strength steel sheets are generally inferior in press formability, and because the shape change (springback) due to elastic recovery after mold release is large and dimensional accuracy is likely to occur, applicable parts are limited. It is. Therefore, for the purpose of improving the press formability and improving the shape freezing property after press forming, the warm press forming described in Patent Document 1 and the like, in which the blank is heated after being heated to a predetermined temperature, is applied. . Warm press forming is performed at a higher temperature than cold press forming, thereby reducing the deformation resistance of the steel sheet, improving the deformability, preventing defects such as cracking during pressing, and freezing the shape after forming. This is a technique for improving the property (characteristic that the shape of the panel formed by press-molding the blank maintains the mold shape).
また、特許文献２には加熱した金属板を金型を用いて熱間成形する際に金型に冷却機構を持たせて、焼き入れ強度を部位によって変化させる技術が開示されている。 Patent Document 2 discloses a technique in which when a heated metal plate is hot-formed using a mold, the mold is provided with a cooling mechanism and the quenching strength is changed depending on the part.
さらに特許文献３には、熱間プレス成形における焼入れ硬度を得るため、あるいは金型への蓄熱を防ぐため、さらには冷却効率を向上させるために、金型に溝を設けるとともに、その中に冷媒を導入する技術が開示されている。 Further, in Patent Document 3, a groove is provided in the mold in order to obtain quenching hardness in hot press molding or to prevent heat accumulation in the mold, and in order to improve cooling efficiency, and a coolant is contained therein. A technique for introducing the method is disclosed.
温間成形では、加熱されたブランクを金型により挟圧してプレス成形するため、金型との接触によりブランクの温度はプレス成形中に降下し、金型との接触の有無や接触時間の差などの影響により、ブランクを成形して得られたパネル内で不均一な温度分布が生じやすい。薄鋼板が適用される自動車用骨格部品などでは、温間成形後のパネルに温度分布（温度差）が生じている場合には、プレス成形後の空冷中にパネル形状が変化し、所望の寸法のパネルが得られないという問題がしばしば発生していた。 In warm forming, a heated blank is pressed by a mold and press-molded, so the temperature of the blank drops during press molding due to contact with the mold, and there is a difference in the presence or absence of contact with the mold and the contact time. Due to such influences, a non-uniform temperature distribution tends to occur in a panel obtained by molding a blank. In automotive framework parts to which thin steel plates are applied, when the temperature distribution (temperature difference) occurs in the panel after warm forming, the panel shape changes during air cooling after press forming, and the desired dimensions The problem of not being able to obtain the panel often occurred.
本発明は、前記課題を解決し、温間成形後のプレスパネルの寸法精度を向上させるための技術を提供することを目的とする。 An object of the present invention is to solve the above-mentioned problems and to provide a technique for improving the dimensional accuracy of a press panel after warm forming.
前記課題を解決するためになされた本発明のプレス成形方法は、鋼板を４００〜７００℃の範囲に加熱した後にプレス成形を行う温間プレス成形方法において、鋼板とプレス金型の接触時間が長い金型の部位に溝を設定した金型を用いて成形することを特徴とするプレス成形方法である。 The press forming method of the present invention made to solve the above problems is a warm press forming method in which press forming is performed after heating a steel plate to a range of 400 to 700 ° C., and the contact time between the steel plate and the press die is long. A press molding method is characterized in that molding is performed using a mold in which a groove is set in a portion of the mold.
本発明の前提である温間成形は、特許文献２および特許文献３に開示されるような、鋼板を成形時に急冷し焼き入れして強度を得るものではない。 The warm forming which is the premise of the present invention does not obtain strength by rapidly cooling and quenching a steel sheet as disclosed in Patent Document 2 and Patent Document 3.
本発明における金型表面に設けられた溝は、特許文献３に開示されたような冷媒を導入して鋼板の冷却を促進させるものではなく、それとは全く正反対に空冷時の形状不良を防ぐために、温間成形時の鋼板と金型と非接触部との温度差を低減させて、金型と鋼板の接触面積を最小限に抑えるための緩冷却の空間を設ける役割を持つもので、特許文献３の技術とは目的や作用が根本的に異なっている。 The groove provided on the mold surface in the present invention does not promote the cooling of the steel sheet by introducing the refrigerant as disclosed in Patent Document 3, and in order to prevent the shape defect at the time of air cooling, contrary to that. It has the role of providing a space for slow cooling to minimize the contact area between the mold and the steel sheet by reducing the temperature difference between the steel sheet, the mold and the non-contact part during warm forming. The purpose and action are fundamentally different from the technique of Reference 3.
上記課題を解決するために、本発明は以下の構成からなる。 In order to solve the above problems, the present invention has the following configuration.
[１]鋼板を４００〜７００℃の範囲で加熱した後に、該鋼板を上下金型としわ押さえで挟圧して、金型形状に深絞り成形する鋼板の温間プレス成形方法において、前記上下金型としわ押さえの両方、もしくは、上下金型、しわ押さえ、上金型または下金型のいずれかに、緩冷却のための溝形状を設けて前記鋼板の温度低下を防止することを特徴とする鋼板の温間プレス成形方法。 [1] In the warm press forming method of a steel plate, in which the steel plate is heated in a range of 400 to 700 ° C. and then pressed with an upper and lower mold and a wrinkle press, and deep drawn into a mold shape, the upper and lower molds Both the mold and the wrinkle retainer, or the upper and lower molds, the wrinkle retainer, the upper mold or the lower mold are provided with a groove shape for slow cooling to prevent a temperature drop of the steel sheet. Warm press forming method for steel sheet.
[２]鋼板を４００〜７００℃の範囲に加熱した後に、該鋼板を上金型と下金型でフォーム成形する鋼板の温間プレス成形方法において、前記上金型または下金型、もしくは上下金型の両方に、緩冷却のための溝形状を設けて前記鋼板の温度低下を防止することを特徴とする鋼板の温間プレス成形方法。 [2] In the warm press forming method of a steel sheet in which the steel sheet is heated to a range of 400 to 700 ° C. and then formed into an upper mold and a lower mold, the upper mold or the lower mold, A warm press forming method for a steel sheet, characterized in that a groove shape for slow cooling is provided on both dies to prevent a temperature drop of the steel sheet.
[３]上記[１]または[２]に記載の温間プレス成形方法において、金型のダイス肩Ｒ部または金型のポンチ肩Ｒ部、もしくは金型のダイス肩Ｒ部と金型のポンチ肩Ｒ部の両方に、緩冷却のための溝形状を設けて前記鋼板の温度低下を防止することを特徴とする鋼板の温間プレス成形方法。 [3] In the warm press molding method according to [1] or [2] above, a die shoulder R portion of the mold, a punch shoulder R portion of the mold, or a die shoulder R portion of the mold and the punch of the mold A warm press forming method for a steel sheet, characterized in that a groove shape for slow cooling is provided on both shoulders R to prevent a temperature drop of the steel sheet.
[４]前記溝形状の深さは０．５ｍｍ以上であることを特徴とする上記[１]乃至[３]の何れかに記載の鋼板の温間プレス成形方法。 [4] The steel sheet warm press forming method according to any one of [1] to [3], wherein the depth of the groove shape is 0.5 mm or more.
[５]深絞り成形では、上金型、下金型、しわ押さえ、金型のダイス肩Ｒ部、金型のポンチ肩Ｒ部のいずれか、フォーム成形では、上金型、下金型、金型のダイス肩Ｒ部、金型のポンチ肩Ｒ部のいずれかの２０％以上の面積に、緩冷却のための溝形状が設けられた金型を用いることを特徴とする上記[１]乃至[４]の何れかに記載の鋼板の温間プレス成形方法。 [5] In deep drawing, one of the upper die, the lower die, the wrinkle presser, the die shoulder R portion of the die, and the punch shoulder R portion of the die. In the foam molding, the upper die, the lower die, The above-mentioned [1], wherein a die having a groove shape for gentle cooling is used in an area of 20% or more of either the die shoulder R portion of the die or the punch shoulder R portion of the die. Thru | or the hot press forming method of the steel plate in any one of [4].
[６]前記溝形状が成形方向に対し、平行方向、直交方向、傾斜方向に１または複数の溝を設けるか、あるいは、格子状、十字状、円形の溝を１または複数設けてなる金型を用いることを特長とする上記[１]乃至[５]の何れかに記載の鋼板の温間プレス成形方法。 [6] A mold in which the groove shape is provided with one or a plurality of grooves in a parallel direction, an orthogonal direction, and an inclination direction with respect to the molding direction, or one or a plurality of lattice-shaped, cross-shaped, or circular grooves. The method for warm press forming a steel sheet according to any one of the above [1] to [5], wherein
[７]上記[１]乃至[６]の何れかに記載の鋼板の温間プレス成形方法に用いられ、金型表面に溝形状を有する成形金型。 [7] A molding die used in the warm press molding method for a steel sheet according to any one of the above [1] to [6] and having a groove shape on the die surface.
[８] 上記[１]乃至[６]の何れかに記載の鋼板の温間プレス成形方法により成形することを特徴とする自動車用部品。 [8] An automotive part, which is formed by the warm press forming method for a steel sheet according to any one of [1] to [6].
本発明によれば、温間プレス成形後の空冷時に生じるパネルの形状変化を低減することができ、寸法精度が良好な自動車用骨格部品を製造することができる。従来、プレス後の寸法精度不良が原因で適用できなかった高強度鋼板を自動車用骨格部品に適用し寸法精度に優れた自動車用骨格部品を提供できるようになり、車体の軽量化などの環境問題の改善に大きく寄与することができる。 ADVANTAGE OF THE INVENTION According to this invention, the shape change of the panel which arises at the time of the air cooling after warm press molding can be reduced, and the frame | skeleton components for motor vehicles with favorable dimensional accuracy can be manufactured. Conventionally, high-strength steel sheets that could not be applied due to poor dimensional accuracy after pressing can be applied to automotive skeletal components to provide automotive skeletal components with excellent dimensional accuracy. Can greatly contribute to the improvement.
以下に図を用いて本発明を説明する。 The present invention will be described below with reference to the drawings.
図１に示すように、一般に鋼板の深絞り成形を行う場合、成形時に発生するしわを抑制するために、しわ押さえを配置し、フランジ部をダイスとしわ押さえで挟圧しつつ縦壁部に張力を負荷しながら成形を行う。 As shown in FIG. 1, when performing deep drawing of a steel sheet in general, a wrinkle presser is arranged to suppress wrinkles that occur during forming, and the flange portion is used as a die and the vertical wall portion is tensioned with a wrinkle presser. Molding while loading.
図２に示すように、自動車用骨格部品では略ハット型断面形状部品をスポット溶接などで接合し閉断面を構成する場合が多く、フランジ部はプレス品同士をスポット溶接などで接合するための部位として平坦であることが望ましく、これがブランクにしわ抑え力を負荷しながら成形する理由の一つでもある。 As shown in FIG. 2, in car frame parts, generally hat-shaped cross-section parts are often joined by spot welding to form a closed cross section, and the flange part is a part for joining pressed parts by spot welding or the like. It is desirable that the material is flat, and this is one of the reasons for forming the blank while applying a wrinkle restraining force.
このような成形方法の場合には、プレス品のフランジ部は、成形初期から成形完了に至るまでの間、しわ押さえと金型（ダイス）（図２の場合は上金型）によって挟圧されているため、加熱されたブランクをプレス成形する温間成形では、フランジに相当する部分は金型への熱移動が生じ温度が降下しやすくなり、フランジ部分とそれ以外の部分の温度差が大きくなってしまう。 In the case of such a molding method, the flange portion of the press product is clamped by a wrinkle presser and a die (die in the case of FIG. 2) from the initial molding to the completion of molding. Therefore, in warm forming that press-molds a heated blank, heat transfer to the mold occurs in the part corresponding to the flange and the temperature tends to drop, and the temperature difference between the flange part and other parts is large. turn into.
発明者らは、成形品のフランジ部分とそれ以外の部分の温度差が生じていることで、温間成形プレス後の空冷過程において、プレス品の形状変化の原因になることを実験により見出した。 The inventors have found through experiments that the temperature difference between the flange portion of the molded product and the other portions causes a change in the shape of the pressed product in the air-cooling process after the warm forming press. .
図３に略ハット型断面形状部品（パネル）のフランジ部とそれ以外の部分との平均温度差と成形直後から空冷後へのパネルの形状変化量の関係を示す。パネルの形状変化量は、基準となるプレス品に対するフランジ端部での開き量で評価した。図３に示すように、フランジ部とそれ以外の部分との平均温度差が大きくなるにしたがって、空冷後の形状変化量が大きくなることがわかる。パネル内部に温度偏差がある場合、室温までに冷却される過程での熱収縮量がパネル内の場所によって異なるため、パネル内部に残留応力分布が発生することになり、この応力を開放するようにパネルの形状が変化することが空冷時の形状変化の主要因である。 FIG. 3 shows the relationship between the average temperature difference between the flange portion of the substantially hat-shaped cross-sectional component (panel) and other portions and the amount of change in the shape of the panel from immediately after molding to after air cooling. The amount of change in the shape of the panel was evaluated by the amount of opening at the flange end relative to the standard press product. As shown in FIG. 3, it can be seen that the amount of change in shape after air cooling increases as the average temperature difference between the flange portion and the other portions increases. If there is a temperature deviation inside the panel, the amount of thermal shrinkage in the process of cooling to room temperature will vary depending on the location in the panel, so a residual stress distribution will be generated inside the panel and this stress will be released. The change in the shape of the panel is the main cause of the shape change during air cooling.
図３の結果から、平均温度差が１００℃を超えると急激に形状変化量が増加するため、パネル温度差に起因した形状変化量のばらつきを低減するためには、平均温度差は１００℃以内に抑えることが望ましいことは明らかである。 From the result of FIG. 3, since the shape change amount increases rapidly when the average temperature difference exceeds 100 ° C., the average temperature difference is within 100 ° C. in order to reduce the variation in the shape change amount due to the panel temperature difference. Obviously, it is desirable to keep it at a minimum.
そこで、発明者らはブランクが最も高面圧で挟圧されているしわ押さえ面と金型面に溝を付与することにより、ブランクと金型との接触面積を減少させ、ブランクから金型への熱伝導を抑えることによりブランクの温度降下を抑えて緩冷却し、その結果、フランジ部と他の部位との温度差を従来方法より減少し、パネルを空冷した際の寸法精度不良を改善できることを確認した。 Therefore, the inventors reduce the contact area between the blank and the mold by providing a groove on the wrinkle holding surface and the mold surface where the blank is clamped at the highest surface pressure, and from the blank to the mold. By suppressing the heat conduction of the blank, the temperature drop of the blank is suppressed and cooled slowly. As a result, the temperature difference between the flange and other parts can be reduced compared to the conventional method, and the dimensional accuracy failure when the panel is air-cooled can be improved. It was confirmed.
金型に設定する溝の形状は深さが０．５ｍｍ以上がよくブランクと金型との接触部面積の２０％以上の部分に溝形状が設定されていることで十分効果が得られることを確認した。 The groove shape to be set in the mold should have a depth of 0.5 mm or more, and a sufficient effect can be obtained by setting the groove shape in a portion of 20% or more of the contact area of the blank and the mold. confirmed.
また、しわ押さえ、もしくは、金型のいずれかに溝を付与しておくだけでも温度降下を抑えることができ、効果が現れることも確認した。 Moreover, it was confirmed that the temperature drop could be suppressed by merely providing a groove in either the wrinkle holder or the mold, and the effect appeared.
また、しわ押さえを使用しないフォーム成形においては、金型に溝を付与するとよく、また、深絞り成形、プレス成形ともに、金型のポンチ肩Ｒ部および／または金型のダイス肩Ｒ部に溝を付与しても良好な効果が得られる。 Further, in foam molding that does not use a wrinkle retainer, it is preferable to provide a groove in the mold, and in both deep drawing molding and press molding, a groove is formed in the punch shoulder R portion of the mold and / or the die shoulder R portion of the mold. A good effect can be obtained even if it is added.
本発明は、電気炉による加熱や、通電加熱や遠赤外線加熱などの急速加熱など、ブランクの加熱方法の種類によらず同じ効果を発揮するものである。また、本発明は、成形に使用するプレス機の種類にもよらず同じ効果を発揮する。 The present invention exhibits the same effect regardless of the type of heating method of the blank, such as heating by an electric furnace, rapid heating such as energization heating and far-infrared heating. In addition, the present invention exhibits the same effect regardless of the type of press used for molding.
また、溝の形状は図４に示す通り、成形方向に対して、平行方向、直交方向、傾斜方向の溝、あるいは、格子状、十字状、円形の溝を１本または複数本設定するとよい。 Further, as shown in FIG. 4, the shape of the groove may be set to one or a plurality of grooves in a parallel direction, an orthogonal direction, an inclined direction, or a lattice shape, a cross shape, or a circular shape with respect to the forming direction.
板厚１．６ｍｍ、引張強度９８０ＭＰａ級の高強度鋼板を用いて、一例として加熱温度７００℃にてブランクを加熱した後、図５（ａ）に示すような断面がハット形状の部品を図５（ｂ）に示すポンチを用いて温間深絞り成形を行った。このとき上金型としわ押さえ部に深さ０．５ｍｍ、２０ｍｍピッチの溝を成形方向と平行に設定して（図６）温間成形を行った。なお、溝は、ブランクと接触する表面積全体に対して５０％の面積率とした。 Using a high-strength steel plate having a thickness of 1.6 mm and a tensile strength of 980 MPa, for example, after heating the blank at a heating temperature of 700 ° C., a part having a hat-shaped cross section as shown in FIG. Warm deep drawing was performed using the punch shown in (b). At this time, warm molding was performed by setting grooves of 0.5 mm in depth and 20 mm pitch in the upper mold and the wrinkle holding part in parallel with the molding direction (FIG. 6). The groove had an area ratio of 50% with respect to the entire surface area in contact with the blank.
比較のため、従来の溝のない金型を用いて、同じ条件で温間プレス成形を実施した。 For comparison, warm press molding was performed under the same conditions using a conventional mold without grooves.
ブランクの加熱には電気炉を用いた。在炉時間を３００秒に設定しブランク全体が均一な温度分布になるように加熱した。加熱されたブランクを炉から取り出し、１０秒の搬送時間の後にプレス機内に送給して成形を実施した。プレス機は一般的なメカニカルプレス機を使用しプレス速度は１５ｓｐｍ（Strokes per minute）とした。 An electric furnace was used for heating the blank. The in-furnace time was set to 300 seconds, and the whole blank was heated so as to have a uniform temperature distribution. The heated blank was taken out from the furnace and fed into a press machine after a 10-second transfer time to perform molding. The press machine used was a general mechanical press machine, and the press speed was 15 spm (Strokes per minute).
成形後のパネルを十分な時間空冷した後，端部の断面形状を測定して基準となるパネル形状に対する形状変化量を測定した。実験結果を図７に示す。本発明例であるしわ押さえと上金型のフランジ成形部分に溝を設定した金型の場合、従来例である溝のない金型の場合と比較して、形状変化量はわずかであった。 After the molded panel was air-cooled for a sufficient time, the cross-sectional shape of the end was measured to measure the amount of change in shape relative to the reference panel shape. The experimental results are shown in FIG. In the case of the mold having a groove formed in the flange forming portion of the wrinkle presser and the upper mold, which is an example of the present invention, the amount of change in shape is small compared to the case of a mold having no groove as in the conventional example.
また、表１に溝の深さおよび溝の面積率を変化させたときの結果を示す。 Table 1 shows the results when the groove depth and the groove area ratio were changed.
金型またはしわ押さえに溝を設けた本発明例であるＮｏ．１からＮｏ．７の形状変化量は、溝のない従来例であるＮｏ．８の形状変化量に比べて著しく低減することがわかる。
さらに溝深さが０．５ｍｍ以上であるＮｏ．２からＮｏ．７は、金型の溝深さが０．５ｍｍ未満であるＮｏ．１より形状変化量が小さく良好であり、これに加えて、溝の面積率が２０％以上のＮｏ．３からＮｏ．７は、しわ押さえおよび金型の溝の面積率が２０％未満のＮｏ．２よりさらに形状変化量が小さく良好である。
No. 1 which is an example of the present invention in which a groove is formed in a mold or a wrinkle retainer. 1 to No. The shape change amount of No. 7 is No. 7 which is a conventional example without grooves. As can be seen from FIG.
Furthermore, No. whose groove depth is 0.5 mm or more. 2 to No. No. 7 has a groove depth of less than 0.5 mm. No. 1 in which the amount of change in shape is small and good, and in addition to this, No. 1 with a groove area ratio of 20% or more 3 to No. No. 7 is No. 7 in which the area ratio of the wrinkle retainer and the mold groove is less than 20%. The amount of change in shape is smaller and better than 2.
本発明の方法により，温間成形における離型後の空冷によるプレス成形品の形状変化を抑制することができ，寸法精度に優れたプレス成形品を提供することができるようになるため，従来高強度鋼板が適用できなかった自動車用部品に対しても高強度鋼板が適用できるようになり，車体の軽量化と衝突安全性の向上の実現に大きく寄与する． According to the method of the present invention, it is possible to suppress a change in the shape of a press-formed product due to air cooling after release in warm forming, and to provide a press-formed product having excellent dimensional accuracy. High-strength steel sheets can now be applied to automotive parts that could not be applied with high-strength steel sheets, which contributes greatly to the realization of weight reduction and improved collision safety.
１ ダイス
２ ブランク（プレス成形前の鋼板）
３ しわ押さえ
４ ポンチ
５ フランジ部
６ 縦壁部
1 Die 2 Blank (steel plate before press forming)
3 Wrinkle retainer 4 Punch 5 Flange 6 Vertical wall
Claims (7)
前記鋼板の温度低下を防止するために、前記上下金型としわ押さえの両方、もしくは、上下金型、しわ押さえ、上金型または下金型のいずれかに、緩冷却のための溝形状を設けて、該溝と前記鋼板の間に空間を形成することで、前記温間プレス成形時の空冷の際に、熱伝導を抑えることで前記鋼板の温度低下を抑えて、温間プレス成形時に、鋼板の前記上下金型としわ押さえの両方、もしくは、上下金型、しわ押さえ、上金型または下金型のいずれかとの接触部と非接触部との温度差を低減させることを特徴とする鋼板の温間プレス成形方法。 In the warm press forming method of a steel sheet, after heating the steel sheet in the range of 400 to 700 ° C., the steel sheet is clamped with an upper and lower mold and a wrinkle press and deep drawn into a mold shape.
In order to prevent the temperature of the steel plate from decreasing , both the upper and lower molds and the wrinkle retainer, or the upper and lower molds, the wrinkle retainer, the upper mold or the lower mold have a groove shape for slow cooling. By providing a space between the groove and the steel sheet, during air cooling during the warm press forming, the heat conduction is suppressed to suppress the temperature drop of the steel sheet, during the warm press forming. The temperature difference between the contact portion and the non-contact portion of both the upper and lower molds and the wrinkle retainer of the steel sheet, or the upper and lower molds, the wrinkle retainer, the upper mold or the lower mold is reduced. Warm press forming method for steel sheet.
前記鋼板の温度低下を防止するために、前記上金型または下金型、もしくは上下金型の両方に、緩冷却のための溝形状を設けて、該溝と前記鋼板の間に空間を形成することで、前記温間プレス成形時の空冷の際に、熱伝導を抑えることで前記鋼板の温度低下を抑えて、温間プレス成形時に、鋼板の前記上金型または下金型、もしくは上下金型の両方との接触部と非接触部との温度差を低減させることを特徴とする鋼板の温間プレス成形方法。 In a warm press forming method of a steel sheet, in which the steel sheet is heated to a range of 400 to 700 ° C. and then the steel sheet is foam-formed with an upper mold and a lower mold,
In order to prevent a temperature drop of the steel sheet, a groove shape for gentle cooling is provided in both the upper mold, the lower mold, and the upper and lower molds, and a space is formed between the groove and the steel sheet. In the air-cooling at the time of the warm press forming, the heat conduction is suppressed to suppress the temperature drop of the steel plate, and at the time of the warm press forming, the upper die or the lower die, or the upper and lower die of the steel plate A warm press forming method for a steel sheet, characterized by reducing a temperature difference between a contact part and a non-contact part with both molds.
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