JP2010094698A - Method of manufacturing high strength member, hot press molding die used for the method of manufacturing high strength member, and semifinished molded body in method of manufacturing high strength part - Google Patents

Method of manufacturing high strength member, hot press molding die used for the method of manufacturing high strength member, and semifinished molded body in method of manufacturing high strength part Download PDF

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JP2010094698A
JP2010094698A JP2008266349A JP2008266349A JP2010094698A JP 2010094698 A JP2010094698 A JP 2010094698A JP 2008266349 A JP2008266349 A JP 2008266349A JP 2008266349 A JP2008266349 A JP 2008266349A JP 2010094698 A JP2010094698 A JP 2010094698A
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flange portion
split groove
molded body
high strength
outer shape
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Shuntaro Sudo
俊太郎 須藤
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Toyota Motor Corp
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Toyota Motor Corp
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<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a high strength part or the like capable of easily carrying out shape-punching after a hot press process in the method of manufacturing the high strength part using hot press technique. <P>SOLUTION: The method of manufacturing the high strength part includes the hot press step of press-molding and cooling heated steel sheet 1 by a molding die 10 and obtaining a semifinished molded body 2 which is quenched and molded and a shape-punching step of shape-punching the semifinished molded body 2 obtained from the hot press step to be a part shape 3. In the hot press step, a fold divided groove 24 is formed at the flange 21 of the semifinished molded body 2 by a protrusion 17 arranged at the sandwiching surface 12a of the molded die 10 for sandwiching the steel sheet 1. In the step of shape-punching, the flange 21 is folded and divided at the fold divided groove 24 and is removed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、高強度部品製造方法、それに用いられる熱間プレス成形型及びその中間成形体に係り、特に、加熱された鋼板を成形型でプレス成形すると同時に冷却して焼入れ成形された中間成形体を製造する工程と、その後に外形抜きする工程とを含む高強度部品製造方法、その高強度部品製造方法に用いられる熱間プレス成形型及びその高強度部品製造方法における中間成形体に関する。   The present invention relates to a method for producing a high-strength part, a hot press mold used for the method, and an intermediate formed body thereof, and more particularly, an intermediate formed body formed by press-molding a heated steel plate with a forming mold and simultaneously cooling and quench-molding it. The present invention relates to a high-strength component manufacturing method including a step of manufacturing the outer shape and a step of removing the outer shape thereafter, a hot press mold used in the high-strength component manufacturing method, and an intermediate molded body in the high-strength component manufacturing method.

近年、CO排出量低減の面等から、自動車の燃費向上が求められており、そのために車体の軽量化が必要となっている。鋼板をプレス成形して形成されたボディー部品は、車体を構成する主要部品であり、ボディー部品の軽量化が車体の軽量化を大きく左右する。最近、鋼板の軽量化を目的として、高強度鋼板がボディー部品に適用され始めている。これらの高強度鋼板を用いることによりボディー部品の板厚を薄くすることができ、車体全体の軽量化を図ることができる。 In recent years, from the aspect of reducing CO 2 emissions, etc., there has been a demand for improving the fuel efficiency of automobiles, and for this reason, it is necessary to reduce the weight of the vehicle body. Body parts formed by press-molding steel plates are the main parts that make up the vehicle body, and the weight reduction of the body parts greatly affects the weight reduction of the vehicle body. Recently, high-strength steel sheets have begun to be applied to body parts in order to reduce the weight of the steel sheets. By using these high-strength steel sheets, the thickness of the body parts can be reduced, and the weight of the entire vehicle body can be reduced.

一方で車体に要求される他の重要な性能として、衝突安全性能があり、その要求レベルはますます高まっている。高強度鋼板は、その高強度の反面、追加工が困難であるので、高強度鋼を使用しつつ、この衝突安全性能の確保等に対応する形状を作る技術として、熱間プレス技術が提案されている。   On the other hand, as another important performance required for the vehicle body, there is a collision safety performance, and the required level is increasing more and more. On the other hand, high-strength steel sheets are difficult to add, but hot press technology has been proposed as a technology to create a shape that can be used to ensure this collision safety performance while using high-strength steel. ing.

熱間プレス技術は、例えば引張り強さが500MPa程度の鋼板を900℃程度に加熱保持し、その後直ちに金型に挿入し、金型でプレス成形を行うとともに急速冷却を行い、成形による形状付与と、焼入れによる高強度化とを同時に行なう技術である(例えば特許文献1、2を参照)。近年では1470MPa程度の引張り強さを有するボディー部品が製造されている。この熱間プレス技術を用いることによって、高強度鋼板の難成形性が解決され、高強度且つ寸法精度の高いプレス部品が得られる。   For example, the hot pressing technique is to hold a steel plate having a tensile strength of about 500 MPa at about 900 ° C., and then immediately insert it into a mold, perform press molding with the mold and perform rapid cooling, and give shape by molding. This is a technique for simultaneously increasing the strength by quenching (see, for example, Patent Documents 1 and 2). In recent years, body parts having a tensile strength of about 1470 MPa have been manufactured. By using this hot pressing technique, the difficult formability of the high-strength steel sheet is solved, and a pressed part with high strength and high dimensional accuracy is obtained.

特開2003−34845号公報JP 2003-34845 A 特開2005−240072号公報Japanese Patent Laid-Open No. 2005-240072

熱間プレス技術は、高強度且つ寸法精度の高い成形部品を得ることができ、車体の軽量化に有効な技術と考えられる。しかしながら、熱間プレス技術によって成形された部品は、その高強度のために、後加工が困難であるという問題を有している。   The hot pressing technique can be used to obtain molded parts with high strength and high dimensional accuracy, and is considered to be an effective technique for reducing the weight of the vehicle body. However, parts molded by the hot press technique have a problem that post-processing is difficult due to their high strength.

例えば、熱間絞り成形により形成された中間成形部品から、後加工としてフランジ部等を除去する外形抜き加工を行う場合に、通常の金型鋼で造られた抜き刃を用いて外形抜き加工を施すと、抜き刃工具先端の摩耗が激しく、刃先が早期に欠ける場合もあり、金型の補修頻度が高くなるという問題を有している。   For example, when performing an outline punching process that removes the flange portion or the like as a post-processing from an intermediate molded part formed by hot drawing, an outline punching process is performed using a punching blade made of ordinary mold steel. Then, there is a problem that the wear of the cutting edge tool tip is severe and the cutting edge is chipped at an early stage, and the frequency of repairing the mold is increased.

このため、後加工としてレーザ加工技術によってフランジ部等をレーダ切断し、除去することによって外形抜きすることが考えられるが、工数がかかり、生産効率が低下するおそれがある。また、レーザ加工には、広大な工場設備が必要になり設備投資がかさむという問題がある。   For this reason, it is conceivable to remove the outer shape by radar cutting and removing the flange portion or the like by laser processing technology as post-processing, but this may increase man-hours and reduce production efficiency. In addition, laser processing has the problem of requiring a large factory facility and increasing capital investment.

そして、曲げ加工技術を用いてボディー部品を形成することにより、フランジ部の外形抜き加工を省略する方法も提案されているが、自動車部品において、熱間プレス技術を最も適用したいプレス部品は、センターピラーリンフォースなどの衝突時の乗員保護を目的とする部分であり、これらのプレス部品は断面形状が複雑であり、曲げ加工では形状付与ができない。   A method has also been proposed in which the body part is formed using a bending technique, thereby eliminating the outer shape of the flange part. However, in automotive parts, the press part to which hot press technology is most desired is the center. These parts are intended to protect passengers in the event of a collision such as pillar reinforcement. These press parts have a complicated cross-sectional shape and cannot be shaped by bending.

このように、熱間プレス技術においては、その後の外形抜き加工が困難であることから、外形抜き加工を必要としない成形部品にその適用が制限されている。   As described above, in the hot press technique, since the subsequent outline punching process is difficult, the application thereof is limited to a molded part that does not require the outline punching process.

本発明は、上記の点に鑑みてなされたものであり、その目的とするところは、熱間プレス技術を用いる高強度部品製造において、熱間プレス工程後の外形抜き加工を容易に行うことができる高強度部品製造方法、高強度部品製造方法に用いられる熱間プレス成形型、及び高強度部品製造方法における中間成形体を提供することである。   The present invention has been made in view of the above points, and an object of the present invention is to easily perform outline punching after a hot pressing process in manufacturing a high-strength part using a hot pressing technique. It is to provide a high-strength component manufacturing method, a hot press mold used in the high-strength component manufacturing method, and an intermediate molded body in the high-strength component manufacturing method.

上記課題を解決する高強度部品製造方法の発明は、加熱された鋼板を成形型によりプレス成形と同時に冷却し、焼き入れ成形された中間成形体を得る熱間プレス工程と、熱間プレス工程により得た中間成形体を外形抜きして部品形状とする外形抜き工程と、を含む高強度部品製造方法であって、熱間プレス工程では、鋼板を挟持する成形型の挟持面に設けられた突起部により中間成形体のフランジ部に折割溝を形成し、外形抜き工程では、折割溝でフランジ部を折割して除去することを特徴としている。   The invention of a method for producing a high-strength part that solves the above problems includes a hot pressing process in which a heated steel sheet is cooled simultaneously with press molding by a molding die to obtain a quench-molded intermediate molded body, and a hot pressing process. A method of manufacturing a high-strength component including an outer shape extracting step for extracting an outer shape of the obtained intermediate formed body into a component shape, and a protrusion provided on a clamping surface of a molding die for sandwiching a steel plate in the hot pressing step A split groove is formed in the flange portion of the intermediate molded body by the portion, and the outer shape removing step is characterized by breaking and removing the flange portion with the split groove.

この高強度部品製造方法の発明によれば、フランジ部に折割溝を形成し、その折割溝でフランジ部を折割して除去するので、従来の抜き刃工具を用いた外形抜き加工と比較して、大きな抜き荷重を必要とせず、抜き刃工具の摩耗という問題も生じない。従って、抜き金型の補修頻度も低くすることができ、安価で信頼性の高い外形抜き加工が可能となる。   According to the invention of this high-strength part manufacturing method, a split groove is formed in the flange portion, and the flange portion is split and removed by the split groove. In comparison, a large punching load is not required, and the problem of wear of the punching tool does not occur. Therefore, the frequency of repairing the punching dies can be reduced, and an inexpensive and highly reliable outer shape punching process can be performed.

また、高強度部品製造方法の発明では、外形抜き加工において、フランジ部を折割溝で折り曲げる方向に荷重を加えてフランジ部を折割することが好ましい。   Moreover, in the invention of the high strength component manufacturing method, it is preferable to break the flange portion by applying a load in a direction in which the flange portion is bent by the split groove in the outer shape punching process.

そして、高強度部品製造方法の発明では、中間成形体のビッカース硬さをHV350以上HV520以下とし、折割溝の大きさを、フランジ部の板厚と折割溝の溝深さとの比率が0.4以上0.9以下とすることが好ましい。   In the invention of the high strength part manufacturing method, the Vickers hardness of the intermediate molded body is set to HV350 or more and HV520 or less, and the ratio of the split groove size to the plate thickness of the flange portion and the groove depth of the split groove is 0. It is preferable to set it to 4 or more and 0.9 or less.

熱間プレス成形型の発明は、加熱された鋼板をプレス成形と同時に冷却して、焼き入れ成形された中間成形体を製造し、その後に外形抜きして部品形状とする高強度部品製造方法に用いられる熱間プレス成形型であって、鋼板を挟持する挟持面に突設された突起部を有し、突起部がプレス成形により中間成形体のフランジ部にそのフランジ部を折割して除去可能な折割溝を形成する構成を有することを特徴としている。   The invention of a hot press mold is a method for manufacturing a high-strength part that cools a heated steel sheet simultaneously with press forming to produce an intermediate formed body that has been quenched and formed, and then removes the outer shape into a part shape. This is a hot press mold that is used and has a protruding part protruding from the clamping surface that holds the steel sheet. The protruding part is removed by folding the flange part into the flange part of the intermediate formed body by press molding. It has the structure which forms the possible split groove.

そして、熱間プレス成形型の発明によれば、中間成形体がHV350以上HV520以下のビッカース硬さを有する場合に、突起部は、フランジ部の板厚と折割溝の溝深さとの比率が0.4以上0.9以下の折割溝を形成する大きさを有することが好ましい。   According to the invention of the hot press mold, when the intermediate molded body has a Vickers hardness of HV350 or more and HV520 or less, the protrusion has a ratio between the plate thickness of the flange portion and the groove depth of the split groove. It is preferable to have a size for forming a split groove of 0.4 to 0.9.

また、中間成形体の発明は、加熱された鋼板を成形型でプレス成形と同時に冷却し、焼き入れ成形された中間成形体を製造し、その後に外形抜きして部品形状とする高強度部品製造方法における中間成形体であって、中間成形体のフランジ部にそのフランジ部を折割して除去可能な折割溝を有することを特徴としている。   In addition, the invention of the intermediate formed body manufactures a high strength part manufactured by cooling a heated steel sheet simultaneously with press forming with a forming die to produce a quench formed intermediate formed body, and then removing the outer shape to form a part shape. An intermediate molded body in the method, wherein the intermediate molded body has a split groove that can be removed by splitting the flange portion.

中間成形体の発明によれば、中間成形体は、HV350以上HV520以下のビッカース硬さを有し、折割溝は、フランジ部の板厚と折割溝の溝深さとの比率が0.4以上0.9以下の大きさを有することが好ましい。   According to the invention of the intermediate formed body, the intermediate formed body has a Vickers hardness of HV350 or more and HV520 or less, and the split groove has a ratio of the plate thickness of the flange portion to the groove depth of the split groove. It is preferable to have a size of 0.9 or more.

そして、中間成形体の発明によれば、折割溝は、断面が半円形状を有することが好ましい。   And according to the invention of the intermediate molded body, the folding groove preferably has a semicircular cross section.

本発明によれば、フランジ部に折割溝を形成し、その折割溝でフランジ部を折割して除去するので、従来の抜き刃工具を用いた外形抜き加工と比較して、大きな抜き荷重を必要とせず、抜き刃工具の摩耗という問題も生じない。従って、抜き金型の補修頻度も低くすることができ、安価で信頼性の高い外形抜き加工が可能となる。   According to the present invention, a split groove is formed in the flange portion, and the flange portion is split and removed by the split groove. No load is required, and the problem of wear of the punching tool does not occur. Therefore, the frequency of repairing the punching dies can be reduced, and an inexpensive and highly reliable outer shape punching process can be performed.

以下に、図面を用いて本発明に係る実施の形態について詳細に説明する。
本実施の形態では、熱間プレス工程後の中間成形体の形状を、高強度部品の立壁部に外形抜き用のフランジ部が接続された、いわゆる断面ハット形状(例えば図4を参照)とし、外形抜き工程後の高強度部品の形状を、両側方が開口して頂部と立壁部とを有する断面コ字形状(例えば図6を参照)として説明する。
Embodiments according to the present invention will be described below in detail with reference to the drawings.
In the present embodiment, the shape of the intermediate molded body after the hot pressing step is a so-called cross-sectional hat shape (see, for example, FIG. 4) in which a flange portion for outer shape extraction is connected to a standing wall portion of a high-strength part. The shape of the high-strength part after the outer shape extraction step will be described as a U-shaped cross section (see, for example, FIG. 6) having both the top and the standing wall.

尚、この中間成形体や高強度部品の形状は、説明のための一例であって、これ以外の形状であってもよく、例えば外形抜き用のフランジ部を有し、縦断面において略U字状の中間成形体、例えば鍔のある底付円筒を熱間プレス技術によって成形し、その後にフランジ部を外形抜きした高強度部品であってもよい。   The shape of the intermediate molded body and the high-strength part is an example for explanation, and may be other shapes. For example, the intermediate molded body or the high-strength part has a flange portion for removing the outer shape and has a substantially U-shaped longitudinal section. It may be a high-strength part in which a shaped intermediate molded body, for example, a flanged bottomed cylinder is molded by a hot press technique, and then the flange portion is cut out.

図1から図6は、熱間プレス技術を用いる高強度部品製造方法の各工程を説明する図である。図1、図2は熱間プレス工程を構成する各工程を説明するための図、図3は、図2のA部分を拡大して示す図である。そして、図4は、外形抜き工程を説明する図、図5は、図4の部分拡大図、図6は、外形抜き工程後の高強度部品の様子を説明する図である。   FIG. 1 to FIG. 6 are diagrams for explaining each step of a high-strength component manufacturing method using a hot pressing technique. 1 and 2 are diagrams for explaining each process constituting the hot pressing process, and FIG. 3 is an enlarged view of a portion A in FIG. 4 is a diagram for explaining the outer shape removing process, FIG. 5 is a partially enlarged view of FIG. 4, and FIG. 6 is a diagram for explaining the state of the high strength component after the outer shape removing process.

本実施の形態における高強度部品製造方法は、大別すると、加熱された鋼板1を成形型でプレス成形すると同時に冷却して焼入れ成形された中間成形体2を製造する熱間プレス工程と、その後に中間成形体2のフランジ部21を折割してフランジ部21の不要部分26を除去する外形抜き工程とからなる。   The high-strength component manufacturing method in the present embodiment can be broadly classified as follows: a hot press step of manufacturing the intermediate formed body 2 that is formed by press-forming the heated steel sheet 1 with a forming die and simultaneously cooling and quenching, and thereafter And the outer shape removing step of breaking the flange portion 21 of the intermediate molded body 2 to remove the unnecessary portion 26 of the flange portion 21.

熱間プレス工程は、加熱工程と、金型セット工程と、成形工程とからなる。まず、加熱工程では、熱間成形用の鋼板1が所定温度まで加熱されて保持される。鋼板1は、その後の急冷によって焼入れするために、例えば850度(℃)以上の適当な温度まで大気中加熱される。鋼板1の加熱保持は、例えば電気加熱炉を用いて行われ、熱電対で測温し、所定温度で所定時間保持される。鋼板1には、焼入れによって高強度化が可能なものが用いられており、具体的には、熱間プレス工程後の硬さがビッカース硬さHV350からHV520の間となるものが用いられている。   The hot pressing process includes a heating process, a mold setting process, and a molding process. First, in the heating step, the hot forming steel plate 1 is heated to a predetermined temperature and held. The steel sheet 1 is heated in the atmosphere to an appropriate temperature of, for example, 850 degrees (° C.) or higher in order to quench by subsequent quenching. The steel plate 1 is heated and held using, for example, an electric heating furnace, measured by a thermocouple, and held at a predetermined temperature for a predetermined time. As the steel sheet 1, one that can be increased in strength by quenching is used, and specifically, one having a hardness after the hot pressing step between Vickers hardness HV350 to HV520 is used. .

次に、金型セット工程では、加熱工程により所定温度に加熱保持された鋼板1が金型(成形型)10にセットされる。図1には、加熱された鋼板1を金型10にセットする工程が示されている。   Next, in the mold setting process, the steel plate 1 heated and held at a predetermined temperature by the heating process is set in the mold (molding mold) 10. FIG. 1 shows a process of setting the heated steel plate 1 in the mold 10.

金型10は、図1に示すように、ダイ11とパンチ16とで構成され、ダイ11は、下型12と上型13とからなる。下型12と上型13は、その中心部にパンチ16を通すための成形穴14、15が形成されている。成形穴14の内部形状は、鋼板1の板厚分に相当するだけ、パンチ16の外形よりも大きめに形成されている。下型12の上面には、突起部17が設けられており、熱間プレス工程によって、フランジ部21に折割溝24を有する中間成形体2(例えば図4を参照)を成形できるように構成されている。この突起部17の構成については後述する。   As shown in FIG. 1, the mold 10 includes a die 11 and a punch 16, and the die 11 includes a lower mold 12 and an upper mold 13. The lower mold 12 and the upper mold 13 are formed with molding holes 14 and 15 through which the punch 16 passes. The inner shape of the forming hole 14 is larger than the outer shape of the punch 16 so as to correspond to the thickness of the steel plate 1. A protrusion 17 is provided on the upper surface of the lower mold 12, and the intermediate molded body 2 (for example, see FIG. 4) having the split groove 24 in the flange portion 21 can be formed by a hot pressing process. Has been. The configuration of the protrusion 17 will be described later.

鋼板1は、金型10のパンチ16を下げ、ダイ11を開放して下型12と上型13を上下に広げた状態で、下型12と上型13との間に挿入されて、金型10にセットされる。そして、成形工程で、金型10にセットされた鋼板1をプレス成形する。図2には、金型10のプレス成形により中間成形体2が形成された状態が示されている。ここでは、金型10の上型13を下降させて、下型12と上型13との間に鋼板1を挟み込む。そして、かかる状態で成形穴14に沿ってパンチ16を突き上げて、鋼板1を成形するとともに、金型10を介して高温の鋼板1の熱を逃がして急冷し、鋼板1に焼き入れを行う。   The steel plate 1 is inserted between the lower die 12 and the upper die 13 in a state where the punch 16 of the die 10 is lowered, the die 11 is opened and the lower die 12 and the upper die 13 are spread vertically. Set in mold 10. And the steel plate 1 set to the metal mold | die 10 is press-molded at a formation process. FIG. 2 shows a state in which the intermediate molded body 2 is formed by press molding of the mold 10. Here, the upper mold 13 of the mold 10 is lowered, and the steel plate 1 is sandwiched between the lower mold 12 and the upper mold 13. In this state, the punch 16 is pushed up along the forming hole 14 to form the steel plate 1, and the heat of the high temperature steel plate 1 is released through the mold 10 and rapidly cooled, and the steel plate 1 is quenched.

鋼板1は、パンチ16によって突き上げられて塑性変形し、図2に示すように、下型12のしわ押さえ面(挟持面)12aと上型13のしわ押さえ面(挟持面)13aとの間で挟まれたフランジ部21と、パンチ16の側壁と上型13の成形穴15の内側とで挟まれた立壁部22とを含む断面ハット形状に成形され、かかる状態で焼き入れがなされる。従って、焼き入れによる高強度化と、成形による形状付与を同時に行うことができ、高強度で且つ寸法精度の高い中間成形体2を得ることができる。   The steel plate 1 is pushed up by the punch 16 and plastically deformed, and as shown in FIG. 2, between the wrinkle pressing surface (clamping surface) 12a of the lower mold 12 and the wrinkle pressing surface (clamping surface) 13a of the upper mold 13. It is formed into a cross-sectional hat shape including the sandwiched flange portion 21 and the standing wall portion 22 sandwiched between the side wall of the punch 16 and the inside of the molding hole 15 of the upper mold 13, and is quenched in this state. Therefore, the strength can be increased by quenching and the shape can be imparted by molding at the same time, and the intermediate molded body 2 having high strength and high dimensional accuracy can be obtained.

金型10のダイ11には、中間成形体2のフランジ部21に折割溝24を形成するための突起部17が設けられている。突起部17は、本実施の形態では、下型12のしわ押さえ面12aに形成されているが、プレス成形時にフランジ部21に折割溝24を形成することができればよく、下型12のしわ押さえ面12aと上型13のしわ押さえ面13aの少なくとも一方に形成されていればよい。   The die 11 of the mold 10 is provided with a protrusion 17 for forming a split groove 24 in the flange portion 21 of the intermediate molded body 2. In the present embodiment, the protrusion 17 is formed on the wrinkle holding surface 12a of the lower mold 12, but it is sufficient that the split groove 24 can be formed in the flange portion 21 during press molding. What is necessary is just to be formed in at least one of the pressing surface 12a and the wrinkle pressing surface 13a of the upper mold | type 13.

突起部17は、図3に示すように、中間成形体2のフランジ部21を外形抜きする箇所に対応して設けられている。突起部17は、断面が半円形状を有しており、その大きさは、外形抜き工程を考慮して、鋼板1の板厚と硬さに基づいて設定される。尚、突起部17の断面形状は、本実施の形態では曲率半径が一定の半円形状としたが、これに限定されるものではなく、例えば互いに曲率半径が異なる複数の円弧を円滑に連続させた凸形状や、押さえ面12aから突出側に移行するに従って互いに接近する逆さV字形状としてもよい。   As shown in FIG. 3, the protruding portion 17 is provided corresponding to a location where the flange portion 21 of the intermediate molded body 2 is extracted. The protrusion 17 has a semicircular cross section, and its size is set based on the thickness and hardness of the steel plate 1 in consideration of the outer shape removal process. The cross-sectional shape of the protrusion 17 is a semicircular shape having a constant curvature radius in the present embodiment, but is not limited to this. For example, a plurality of arcs having different curvature radii can be smoothly connected. Alternatively, it may be a convex shape or an inverted V-shape that approaches each other as it moves from the pressing surface 12a to the protruding side.

突起部17は、レーザ加工によって形成されるが、その他の機械加工等によって形成してもよい。突起部17は、成形工程により、鋼板1の板厚tと溝深さhとの比率rが0.4以上0.9以下となる(0.4≦r≦0.9)、断面が半円形状の折割溝24を形成するように構成されている。   The protrusion 17 is formed by laser processing, but may be formed by other machining or the like. The protrusion 17 has a ratio r between the plate thickness t and the groove depth h of the steel plate 1 of 0.4 or more and 0.9 or less (0.4 ≦ r ≦ 0.9) and has a half cross section by the forming process. A circular split groove 24 is formed.

図4には、熱間プレス工程において成形された中間成形体2の様子が示されている。中間成形体2は、熱間プレス工程の後に、金型10から取り出されて、図3に示す状態から上下に反転された姿勢状態とされ、外形抜き金型30(図5を参照)にセットされる。   FIG. 4 shows a state of the intermediate formed body 2 formed in the hot pressing step. After the hot pressing step, the intermediate molded body 2 is taken out from the mold 10 and is turned upside down from the state shown in FIG. 3, and is set in the outer die 30 (see FIG. 5). Is done.

中間成形体2は、図4に示すように、頂部23及びその頂部23の両端部で対峙する一対の立壁部22と、立壁部22から互いに離反する方向に突出するフランジ部21とを含む断面がハット形状を有する。   As shown in FIG. 4, the intermediate molded body 2 includes a top portion 23, a pair of standing wall portions 22 facing each other at both ends of the top portion 23, and a cross section including a flange portion 21 projecting in a direction away from the standing wall portion 22. Has a hat shape.

そして、フランジ部21には、金型10の突起部17によって形成された折割溝24が設けられている。折割溝24は、図5に示すように、フランジ部21の上面から板厚方向に溝深さhを有するように凹設されており、本実施の形態では、鋼板1の板厚tと溝深さhの比率rが0.4以上0.9以下となる断面が半円形状を有している。   The flange portion 21 is provided with a split groove 24 formed by the protrusion portion 17 of the mold 10. As shown in FIG. 5, the split groove 24 is recessed so as to have a groove depth h in the plate thickness direction from the upper surface of the flange portion 21, and in the present embodiment, the plate thickness t of the steel plate 1 and The cross section in which the ratio r of the groove depth h is 0.4 or more and 0.9 or less has a semicircular shape.

このようにして製造された中間成形体2に対し、次に外形抜き工程が行われる。外形抜き工程では、フランジ部21を折割溝24で折り曲げる方向に荷重を加えてフランジ部を折割することが行われる。   Next, the outer shape removing step is performed on the intermediate molded body 2 manufactured in this way. In the outer shape removing step, the flange portion is bent by applying a load in a direction in which the flange portion 21 is bent by the split groove 24.

本実施の形態では、図4に太矢印で示されるように、フランジ部21の折割溝24よりも外側の不要部分26に上方から所定の荷重Fを加えて、フランジ部21を折り割り、フランジ部21から不要部分26が分断される。   In the present embodiment, as indicated by a thick arrow in FIG. 4, a predetermined load F is applied to the unnecessary portion 26 outside the folding groove 24 of the flange portion 21 from above, and the flange portion 21 is folded. The unnecessary portion 26 is separated from the flange portion 21.

具体的には、図5に示すように、フランジ部21の折割溝24よりも内側のビード部分25が外形抜き金型30の上型31と下型32に挟持された状態で、図示していない油圧プレスにより、フランジ部21の不要部分26に対して上方から荷重Fが加えられる。中間成形体2は、熱間プレス工程によって高硬度を有しているので、かかる荷重Fが加えられることによって、他の部分よりも薄厚で脆弱な折割溝24に曲げ応力が集中し、折割溝24でフランジ部21が折割されて分断され、不要部分26を簡単に除去することができる。従って、従来のように抜き刃工具の早期摩耗等は発生せず、低コストで大量の高強度部品3を製造することができる。このようにして外形抜き加工された高強度部品3の断面図が図6に示される。   Specifically, as shown in FIG. 5, the bead portion 25 on the inner side of the split groove 24 of the flange portion 21 is illustrated in a state where the bead portion 25 is sandwiched between the upper mold 31 and the lower mold 32. A load F is applied to the unnecessary portion 26 of the flange portion 21 from above by the hydraulic press that is not. Since the intermediate molded body 2 has high hardness by a hot pressing process, when the load F is applied, bending stress concentrates on the split groove 24 which is thinner and fragile than other portions, and the folding is performed. The flange portion 21 is broken and divided by the split groove 24, and the unnecessary portion 26 can be easily removed. Therefore, there is no early wear of the punching tool as in the prior art, and a large amount of high-strength parts 3 can be manufactured at low cost. FIG. 6 shows a cross-sectional view of the high-strength component 3 that has been subjected to outline cutting in this way.

上記した高強度部品製造方法によれば、熱間プレス工程にてフランジ部21に折割溝24を有する中間成形体2を形成し、その後の外形抜き工程にて折割溝24で折り割ることによって、中間成形体2からフランジ部21の不要部分26を除去することができる。   According to the above-described high-strength component manufacturing method, the intermediate formed body 2 having the split groove 24 is formed in the flange portion 21 in the hot pressing process, and then the split groove 24 is split in the subsequent outer shape removing process. Thus, the unnecessary portion 26 of the flange portion 21 can be removed from the intermediate molded body 2.

従って、従来の抜き刃による外形抜き加工と比較して、大きな抜き加工を必要とせず、極めて簡単に高強度部品3を得ることができる。また、抜き刃工具の摩耗という問題も生じないので、外形抜き金型(抜き金具)30の補修頻度も低くすることができ、安価で信頼性の高い外形抜き加工が可能となる。   Therefore, compared with the conventional punching with a punching blade, a large punching process is not required, and the high-strength component 3 can be obtained very easily. In addition, since the problem of wear of the punching tool does not occur, the frequency of repairing the outer punching die (cutting metal fitting) 30 can be reduced, and the outer punching process can be performed at low cost and with high reliability.

次に、本発明の高強度部品製造方法の実施例について説明する。本実施例では、熱間プレス工程(ホットプレス)により、折割溝24を有する試験片Pを製造し、外形抜き工程で油圧プレスを用いて折割溝24で折り曲げる方向に荷重を加えて、折割による外形抜き(フランジ抜き)が可能か否かを評価した。評価としてのフランジ抜き性能は、フランジ抜き可能なものを○、フランジ抜きができなかったものを×とした。その結果を図7に示す。ここでは、実施例として4つ、比較例として4つが示されている。なお、比較例2は、熱間プレス工程(ホットプレス成形)を行わないものである。   Next, an embodiment of the method for manufacturing a high strength part of the present invention will be described. In the present embodiment, a test piece P having a split groove 24 is manufactured by a hot press process (hot press), and a load is applied in a direction to be bent by the split groove 24 using a hydraulic press in the outer shape removing process. It was evaluated whether or not external cutting (flange cutting) was possible by splitting. As the evaluation, the flange removal performance was evaluated as ○ when the flange could be removed and x when the flange could not be removed. The result is shown in FIG. Here, four are shown as examples and four as comparative examples. In Comparative Example 2, the hot pressing process (hot press molding) is not performed.

本実施例では、鋼板として、大きさが30×200ミリメートル、板厚が1.2ミリメートル(mm)の平板状の試験片Pを使用した。試験片Pは、炭素の他に微量のSi及びMn等が添加された成分を有し、化学成分がいずれもmass%にて、炭素量が0.20%、Mnが1.2%、Crが0.2%、残りがFeのものからなる。   In this example, a flat test piece P having a size of 30 × 200 millimeters and a thickness of 1.2 millimeters (mm) was used as the steel plate. The test piece P has a component to which a small amount of Si, Mn and the like are added in addition to carbon, and the chemical components are all mass%, the carbon amount is 0.20%, Mn is 1.2%, Cr Is 0.2% and the balance is Fe.

熱間プレス工程における加熱保持は、電気加熱炉を用いて大気中加熱し、熱電対で測温しながら、所定温度で所定時間保持した。熱間プレス工程における加熱条件及び冷却条件(ホットプレス条件)は、図7に示すように、実施例ごとに変化させ、所定の硬さを得た。熱間プレス工程後(ホットプレス成形後)における試験片Pの硬さは、ビッカース硬さ計で測定した。熱間プレス用の金型10(図1〜図3を参照)は、通常の一般的な金型鋼のものを用いた。そして、金型10の突起部17は、断面が半円形状を有し且つその大きさが異なるものをいくつか用意した(図7の比率rの欄を参照)。   The heating and holding in the hot pressing step was carried out in the air using an electric heating furnace, and held at a predetermined temperature for a predetermined time while measuring with a thermocouple. As shown in FIG. 7, the heating conditions and cooling conditions (hot pressing conditions) in the hot pressing process were changed for each example to obtain a predetermined hardness. The hardness of the test piece P after the hot pressing step (after hot press molding) was measured with a Vickers hardness meter. The hot press mold 10 (see FIGS. 1 to 3) was a normal general mold steel. Several protrusions 17 of the mold 10 were prepared having a semicircular cross section and different sizes (see the column of ratio r in FIG. 7).

熱間プレス工程により、試験片Pには、図8に示すような折割溝24が形成され、また、図9に示すようなマルテンサイト主体の組織が得られた。外形抜き加工は、折割溝24が上方に位置する姿勢状態で試験片Pの折割溝24近傍を外形抜き金型30で支持する(図5を参照)。そして、そこから50ミリメートル離れた位置を、油圧プレスで加圧しながら、試験片Pが破断するか、あるいは90度の角度に曲がるまで、10mm/minの荷重速度で折り曲げた。   By the hot pressing process, the split groove 24 as shown in FIG. 8 was formed in the test piece P, and a martensite-based structure as shown in FIG. 9 was obtained. In the outline punching process, the vicinity of the split groove 24 of the test piece P is supported by the external punch die 30 in a posture state in which the split groove 24 is positioned upward (see FIG. 5). Then, a position 50 mm away from the test piece was bent at a load speed of 10 mm / min while pressing with a hydraulic press until the test piece P was broken or bent at an angle of 90 degrees.

実施例1〜実施例4の場合、板厚tと溝深さhとの比率rが0.4以上0.9以下の範囲(0.4≦r≦0.9)にあり、かつ試験片Pのビッカース硬さがHV350からHV520の範囲にある。そして、その結果は、例えば図11に示すように、折割溝24で折割することができ、外形抜き可能(フランジ抜き可能)という評価となった。尚、図11において、2カ所が破断しているのは、試験片Pに2つの折割溝を形成して試験を行ったことによる。   In the case of Examples 1 to 4, the ratio r of the plate thickness t to the groove depth h is in the range of 0.4 to 0.9 (0.4 ≦ r ≦ 0.9), and the test piece The Vickers hardness of P is in the range of HV350 to HV520. Then, as a result, for example, as shown in FIG. 11, it was possible to divide by the split groove 24, and it was evaluated that the outer shape could be removed (flange removal possible). In FIG. 11, the two parts are broken because the test was performed by forming two split grooves in the test piece P.

これに対し、比較例3は、ビッカース硬さがHV540であり、上限硬さHV520よりも大きく、硬すぎることから、油圧プレスで曲げることができなかった。従って、折割溝24で折り割ることができず、外形抜き不可能という評価になった。   On the other hand, Comparative Example 3 had a Vickers hardness of HV540, which was larger than the upper limit hardness HV520 and was too hard, and thus could not be bent with a hydraulic press. Therefore, it was evaluated that the outer groove could not be removed because it could not be folded by the folding groove 24.

比較例2ではビッカース硬さがHV180、比較例4ではビッカース硬さがHV320であり、下限硬さHV350よりも小さく、柔らかいことから、試験片Pは折割溝24で曲がるのみであって、90度の角度まで折曲された。そして、図10に示すように、更に180度の角度近傍まで折曲しても破断するまでには至らなかった。従って、折割溝24で折り割ることができず、外形抜き不可能(破断せず)という評価になった。従って、以上のことから、熱間プレス後のビッカース硬さは、HV350からHV520が好ましい。   In Comparative Example 2, the Vickers hardness is HV180, and in Comparative Example 4, the Vickers hardness is HV320, which is smaller than the lower limit hardness HV350 and soft, so that the test piece P only bends at the split groove 24, and 90 It was bent to an angle of degrees. And as shown in FIG. 10, even if it bent further to the angle vicinity of 180 degree | times, it did not reach to fracture. Therefore, it was not possible to be folded by the folding groove 24, and it was evaluated that the outer shape could not be removed (not broken). Therefore, from the above, the Vickers hardness after hot pressing is preferably HV350 to HV520.

また、比較例1は、板厚tと溝深さhとの比率rが0.4よりも小さい値であることから、油圧プレスで曲げることができなかった。従って、折割溝24で折割することができず、外形抜き不可能という評価になった。このことから、通常のプレス機での折り曲げ加工を考慮すると、折割により外形抜き可能とするには、比率rが0.4以上となる溝深さhが必要とされる。   Further, in Comparative Example 1, the ratio r between the plate thickness t and the groove depth h was a value smaller than 0.4, so that it could not be bent with a hydraulic press. Therefore, it was evaluated that it was impossible to break the outer shape with the folding groove 24 and the outer shape could not be removed. Therefore, in consideration of bending with a normal press machine, a groove depth h with a ratio r of 0.4 or more is required in order to be able to remove the outer shape by folding.

また、発明者は、板厚tと溝深さhとの比率rが0.9以上の値、具体的には比率rが0.94となる溝深さの場合についても実験も行った。その結果は、熱間プレス工程の途中で折割溝24が破断し、適正な形状に成形することができなかった。これは、熱間プレス工程では鋼板1が加熱されてその材料強度が低下している状況で塑性加工が行われるので、折割溝24の溝深さを深くすると、塑性加工時の鋼板流入量が低下し、鋼板に作用する引っ張り荷重に耐えきれずに破断することが理由として考えられる。従って、以上のことから、折割溝24は、鋼板1の板厚tと溝深さhの比率rが0.4以上0.9以下の範囲となる大きさが好ましい。   The inventor also conducted an experiment for a case where the ratio r between the plate thickness t and the groove depth h is 0.9 or more, specifically, the groove depth at which the ratio r is 0.94. As a result, the split groove 24 broke during the hot pressing process and could not be formed into an appropriate shape. This is because, in the hot pressing process, the steel plate 1 is heated and plastic processing is performed in a state where the material strength is lowered. Therefore, if the groove depth of the split groove 24 is increased, the amount of inflow of the steel plate during plastic processing is increased. The reason for this is considered to be that the material is broken and cannot withstand the tensile load acting on the steel sheet and breaks. Therefore, the size of the split groove 24 is preferably such that the ratio r of the plate thickness t to the groove depth h of the steel plate 1 is in the range of 0.4 to 0.9.

本実施の形態における高強度部品製造方法の金型セット工程を説明する図。The figure explaining the metal mold | die setting process of the high strength component manufacturing method in this Embodiment. 本実施の形態における高強度部品製造方法の熱間プレス成形工程を説明する図。The figure explaining the hot press molding process of the high strength component manufacturing method in this Embodiment. 図2のA部分を拡大して示す図。The figure which expands and shows the A section of FIG. 本実施の形態における高強度部品製造方法の外形抜き工程を概念的に示す図。The figure which shows notionally the external shape extraction process of the high strength component manufacturing method in this Embodiment. 図4に示す外形抜き工程の一例を説明するための部分拡大図。The elements on larger scale for demonstrating an example of the external shape extraction process shown in FIG. 本実施の形態における高強度部品製造方法で製造された高強度部品を示す図。The figure which shows the high strength component manufactured with the high strength component manufacturing method in this Embodiment. 本実施の形態において得られた中間成形体について比較例とともに外形抜き性能を実験した結果を示す図。The figure which shows the result of having experimented the outline extraction performance with the comparative example about the intermediate molded object obtained in this Embodiment. 比較例1における中間成形体の凹溝部の断面を拡大して示す図。The figure which expands and shows the cross section of the ditch | groove part of the intermediate molded object in the comparative example 1. 実施例1における高強度部品の組織写真を示す図。The figure which shows the structure | tissue photograph of the high intensity | strength components in Example 1. FIG. 比較例4における高強度部品の未破断状態を側面から示す図。The figure which shows the unbreakage state of the high strength components in the comparative example 4 from a side surface. 実施例1における高強度部品の破断状態を上面から示す図。The figure which shows the fracture state of the high strength components in Example 1 from the upper surface.

符号の説明Explanation of symbols

1 鋼板
2 中間成形体
3 高強度部品
10 金型
12 下型
13 上型
12a、13a しわ押さえ面(挟持面)
17 突起部
21 フランジ
24 折割溝
26 不要部分
DESCRIPTION OF SYMBOLS 1 Steel plate 2 Intermediate molded body 3 High-strength part 10 Mold 12 Lower mold 13 Upper mold 12a, 13a Wrinkle pressing surface (clamping surface)
17 Protruding part 21 Flange 24 Folding groove 26 Unnecessary part

Claims (8)

加熱された鋼板を成形型によりプレス成形と同時に冷却し、焼き入れ成形された中間成形体を得る熱間プレス工程と、
該熱間プレス工程により得た前記中間成形体を外形抜きして部品形状とする外形抜き工程と、
を含む高強度部品製造方法であって、
前記熱間プレス工程では、前記鋼板を挟持する前記成形型の挟持面に設けられた突起部により前記中間成形体のフランジ部に折割溝を形成し、
前記外形抜き工程では、前記折割溝で前記フランジ部を折割して除去することを特徴とする高強度部品製造方法。
A hot pressing step in which the heated steel sheet is cooled simultaneously with the press forming by a forming die, and an intermediate formed body is formed by quenching;
An outer shape extracting step in which the intermediate molded body obtained by the hot pressing step is subjected to an outer shape to form a part shape,
A high-strength part manufacturing method including
In the hot pressing step, a split groove is formed in the flange portion of the intermediate formed body by a protrusion provided on the holding surface of the forming die for holding the steel plate,
The high-strength component manufacturing method, wherein in the outer shape removing step, the flange portion is broken and removed by the split groove.
前記外形抜き工程では、前記フランジ部を前記折割溝で折り曲げる方向に荷重を加えて前記フランジ部を折割することを特徴とする請求項1に記載の高強度部品製造方法。   The high-strength component manufacturing method according to claim 1, wherein, in the outer shape removing step, the flange portion is folded by applying a load in a direction in which the flange portion is bent by the split groove. 前記熱間プレス工程では、
前記中間成形体のビッカース硬さをHV350以上HV520以下とし、
前記折割溝の大きさを前記フランジ部の板厚と前記折割溝の溝深さとの比率が0.4以上0.9以下とすることを特徴とする請求項1または2に記載の高強度部品製造方法。
In the hot pressing step,
The intermediate molded body has a Vickers hardness of HV350 to HV520,
3. The height according to claim 1, wherein a ratio of the thickness of the split groove to a plate thickness of the flange portion and a groove depth of the split groove is 0.4 or more and 0.9 or less. Strength component manufacturing method.
加熱された鋼板をプレス成形と同時に冷却して、焼き入れ成形された中間成形体を製造し、その後に外形抜きして部品形状とする高強度部品製造方法に用いられる熱間プレス成形型であって、
前記鋼板を挟持する挟持面に突設された突起部を有し、該突起部が前記プレス成形により前記中間成形体のフランジ部に該フランジ部を折割して除去可能な折割溝を形成する構成を有することを特徴とする熱間プレス成形型。
This is a hot press mold used in a high strength part manufacturing method in which a heated steel sheet is cooled at the same time as press forming to produce a quench-molded intermediate molded body, and then the outer shape is removed to form a part shape. And
It has a projecting portion projecting from the clamping surface for sandwiching the steel plate, and the projecting portion forms a split groove that can be removed by splitting the flange portion into the flange portion of the intermediate formed body by the press molding. A hot press mold characterized by having a configuration to
前記中間成形体がHV350以上HV520以下のビッカース硬さを有する場合に、
前記突起部は、前記フランジ部の板厚と前記折割溝の溝深さとの比率が0.4以上0.9以下の折割溝を形成する大きさを有することを特徴とする請求項4に記載の熱間プレス成形型。
When the intermediate molded body has a Vickers hardness of HV350 or more and HV520 or less,
5. The protrusion has a size that forms a split groove having a ratio of a plate thickness of the flange part to a groove depth of the split groove of 0.4 or more and 0.9 or less. 2. Hot press mold according to 1.
加熱された鋼板を成形型でプレス成形と同時に冷却し、焼き入れ成形された中間成形体を製造し、その後に外形抜きして部品形状とする高強度部品製造方法における中間成形体であって、
前記中間成形体のフランジ部に該フランジ部を折割して除去可能な折割溝を有することを特徴とする中間成形体。
The heated steel sheet is cooled at the same time as press forming with a forming die to produce a quenched formed intermediate formed body, and then an intermediate formed body in a high strength part manufacturing method in which the outer shape is extracted and made into a part shape,
An intermediate molded body having a split groove that can be removed by splitting the flange portion in the flange portion of the intermediate molded body.
前記中間成形体は、HV350以上HV520以下のビッカース硬さを有し、
前記折割溝は、前記フランジ部の板厚と前記折割溝の溝深さとの比率が0.4以上0.9以下の大きさを有することを特徴とする請求項6に記載の中間成形体。
The intermediate molded body has a Vickers hardness of HV350 or more and HV520 or less,
The intermediate molding according to claim 6, wherein the split groove has a ratio of a plate thickness of the flange portion and a groove depth of the split groove of 0.4 to 0.9. body.
前記折割溝は、断面が略半円形状を有することを特徴とする請求項7に記載の中間成形体。   The intermediate molded body according to claim 7, wherein the split groove has a substantially semicircular cross section.
JP2008266349A 2008-10-15 2008-10-15 Method of manufacturing high strength member, hot press molding die used for the method of manufacturing high strength member, and semifinished molded body in method of manufacturing high strength part Pending JP2010094698A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015111015A (en) * 2013-12-06 2015-06-18 三菱重工業株式会社 Coal inactivation treatment apparatus
CN105090222A (en) * 2014-12-31 2015-11-25 李立群 Manufacturing method of high-carbon steel and stainless steel compound type precision gasket
CN106964703A (en) * 2017-05-20 2017-07-21 嘉兴金信铝容器有限公司 A kind of mould for being used to be molded inverse hemming aluminium foil box

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JPH05253358A (en) * 1992-03-12 1993-10-05 Kurobaa Kk Scissors and manufacture thereof
JP2005145168A (en) * 2003-11-13 2005-06-09 Aisin Takaoka Ltd Method of manufacturing vehicle skeleton member
JP2007216257A (en) * 2006-02-16 2007-08-30 Toyota Motor Corp Method for manufacturing high-strength component, hot press forming die to be used in the same method, and partially fabricated component in the same method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05253358A (en) * 1992-03-12 1993-10-05 Kurobaa Kk Scissors and manufacture thereof
JP2005145168A (en) * 2003-11-13 2005-06-09 Aisin Takaoka Ltd Method of manufacturing vehicle skeleton member
JP2007216257A (en) * 2006-02-16 2007-08-30 Toyota Motor Corp Method for manufacturing high-strength component, hot press forming die to be used in the same method, and partially fabricated component in the same method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015111015A (en) * 2013-12-06 2015-06-18 三菱重工業株式会社 Coal inactivation treatment apparatus
CN105090222A (en) * 2014-12-31 2015-11-25 李立群 Manufacturing method of high-carbon steel and stainless steel compound type precision gasket
CN106964703A (en) * 2017-05-20 2017-07-21 嘉兴金信铝容器有限公司 A kind of mould for being used to be molded inverse hemming aluminium foil box
CN106964703B (en) * 2017-05-20 2018-08-17 嘉兴金信铝容器有限公司 A kind of mold for being molded inverse hemming aluminium foil box

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