JP2005138111A - Method and equipment for hot press forming of steel sheet - Google Patents
Method and equipment for hot press forming of steel sheet Download PDFInfo
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- JP2005138111A JP2005138111A JP2003373915A JP2003373915A JP2005138111A JP 2005138111 A JP2005138111 A JP 2005138111A JP 2003373915 A JP2003373915 A JP 2003373915A JP 2003373915 A JP2003373915 A JP 2003373915A JP 2005138111 A JP2005138111 A JP 2005138111A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/001—Shaping combined with punching, e.g. stamping and perforating
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Abstract
Description
本発明は、鋼板を熱間プレス成形する方法及び装置に関し、特に、被加工材である鋼板を高温に加熱し、高温の熱間でプレス成形を行う際に、鋼板のプレス成形と打ち抜き加工を同時に行い、高強度でかつ形状の良好な成形品を得る熱間プレス成形方法及び装置に関するものである。 The present invention relates to a method and an apparatus for hot press forming a steel plate, and in particular, when a steel plate as a workpiece is heated to a high temperature and press forming is performed at a high temperature, press forming and punching of the steel plate are performed. The present invention relates to a hot press molding method and apparatus that are performed simultaneously to obtain a molded product having high strength and good shape.
自動車のドアガードバーやサイドメンバー等の部材は、近年の燃費軽量化の動向に対応すべく軽量化が検討されており、材料面では、薄肉化しても強度および衝突安全性が確保されるという観点から鋼板の高強度化が進められている。しかしながら、材料の成形性は強度が上昇するのに伴って劣化するので、上記部材の軽量化を実現するには、成形性と高強度の両方を満足する鋼板を製造する必要があることから、高強度であり、かつ、成形性に優れた鋼板の開発が数多く行われてきた。しかしながら、これら鋼板は伸びや穴拡げ性といった加工性には優れているものの、鋼板強度が高いことから、形状凍結性が悪いという問題を有している。 Automotive door guard bars and side members are being studied for weight reduction in response to recent trends in fuel economy and weight reduction, and in terms of materials, the strength and collision safety can be ensured even if the thickness is reduced. Since then, the strength of steel sheets has been increasing. However, since the formability of the material deteriorates as the strength increases, it is necessary to manufacture a steel sheet that satisfies both formability and high strength in order to realize the weight reduction of the above member. Many steel plates have been developed that have high strength and excellent formability. However, although these steel plates are excellent in workability such as elongation and hole expansibility, they have a problem that the shape freezing property is poor because the steel plate strength is high.
これら問題を解決する手法として、鋼板を高温まで加熱した後、高温において成形を行い金型内もしくは金型外にて焼入れを行うことで高強度成形品の製造を行う熱間プレス成形方法がある。この手法は、強度の低下する高温で成形、その後、焼き入れることで高強度化を図っているため、引っ張り強度が１４８０ＭＰａ超の形状凍結性に優れた部材を容易に製造可能である。 As a method for solving these problems, there is a hot press forming method in which a steel sheet is heated to a high temperature, then formed at a high temperature, and quenched in or outside the mold to produce a high strength molded product. . In this method, molding is performed at a high temperature at which the strength is reduced, and thereafter, the strength is increased by quenching. Therefore, a member excellent in shape freezing property having a tensile strength exceeding 1480 MPa can be easily manufactured.
しかしながら、焼入れを用いた強化を行うため、８００℃を超えるような高温で加熱せねばならず、炉の中の雰囲気を制御したとしても、炉中での酸化あるいは、炉から取り出し、プレス機に設置し、成形を行うまでに、鋼板表面が酸化し、熱間プレス後の耐食性や熱間プレス後の塗装性を劣化させるという問題を有していた。そこで、特開２０００−３８６４０号公報（特許文献１）や特開２００１−２６４５９１号公報（特許文献２）に記載されるように高温酸化を如何にして抑え、熱間プレス後の耐食性や熱間プレス後の塗装性を向上させるかということに関する研究が数多くなされてきた。あるいは、通常は昇温炉を用いて、被加工材を加熱するため、加熱装置や搬送設備が大型化する傾向にあるため、特開２００２−１８５３１号公報（特許文献３）に示すように、迅速な加熱方法と設備の小型化に関する研究が数多く行われてきた。 However, in order to perform strengthening using quenching, it must be heated at a high temperature exceeding 800 ° C. Even if the atmosphere in the furnace is controlled, oxidation in the furnace or removal from the furnace, Before installation and forming, the steel sheet surface was oxidized, and there was a problem that the corrosion resistance after hot pressing and the paintability after hot pressing deteriorated. Therefore, as described in Japanese Patent Laid-Open No. 2000-38640 (Patent Document 1) and Japanese Patent Laid-Open No. 2001-264591 (Patent Document 2), how to suppress high-temperature oxidation, corrosion resistance after hot pressing and hot There have been many studies on whether to improve paintability after pressing. Or, since a heating apparatus and a conveyance facility tend to be large in order to heat a workpiece usually using a temperature raising furnace, as shown in JP-A-2002-18531 (Patent Document 3), There have been many studies on rapid heating methods and equipment miniaturization.
しかしながら、これら手法において被加工材は、融点の１／２にも達するような高温でプレス成形を行われるため、歪硬化指数（ｎ値）が低く、高温で穴拡げ加工、あるいは、プレス成形を行った場合、成形途中で被加工材の一部が薄くなり、場合によっては破断してしまうため、高温での成形品の複雑加工は困難であるという問題を有していた。その結果、熱間プレスで成形可能な部材としては、単純なプレス成形品しか存在しなかった。 However, in these methods, the work material is press-molded at a high temperature that reaches half of the melting point, so the strain hardening index (n value) is low, and hole expansion or press molding is performed at a high temperature. When this is done, a part of the workpiece is thinned during the molding, and in some cases, it is broken, so that there is a problem that complicated machining of the molded product at a high temperature is difficult. As a result, only simple press-formed products existed as members that can be formed by hot pressing.
あるいは、熱間プレスにて成形後、焼入れを行った後、再度、打ち抜きを行う場合、鋼板強度は１４８０ＭＰａ超の高強度となっている場合があり、その加工には多大なる困難を伴う。また、鋼板強度の増大とともに、加工性は著しく低下しているため、もはや、穴拡げ等の加工を行うことは不可能である。さらには、熱間プレス後の加工は、新たな加工工程を設けることになり、新たな設備投資と製造コスト増を招く。本発明は上記課題を解決し、高温加工性に優れた熱間プレス成形方法及び装置を提供することを目的とする。 Or, after forming by hot pressing, after quenching, and then punching again, the steel sheet strength may be as high as over 1480 MPa, and the processing involves great difficulty. In addition, since the workability is remarkably lowered with the increase in steel plate strength, it is no longer possible to perform processing such as hole expansion. Furthermore, the processing after hot pressing will provide a new processing step, resulting in new equipment investment and increased manufacturing costs. An object of the present invention is to solve the above problems and to provide a hot press molding method and apparatus excellent in high temperature workability.
本発明者等は、種々検討を行った結果、鋼板を熱間プレスする際に、その一部に穴を有する金型あるいはパンチにて、鋼板の成形を行った後、打ち抜き加工を行うことで、成形品の破断なく複雑な成形品の加工ができることを見出した。
本発明は、上記知見に基づいて完成されたもので、その要旨とするところは以下の通りである。
（１）鋼板の成形方法であって、７００℃以上で鋼板のプレス成形を行うと同時に、打ち抜き加工を行うことを特徴とする鋼板の熱間プレス成形方法。
As a result of various studies, the present inventors have conducted a stamping process after forming a steel sheet with a die or punch having a hole in a part thereof when hot pressing the steel sheet. The present inventors have found that a complicated molded product can be processed without breaking the molded product.
The present invention has been completed based on the above findings, and the gist thereof is as follows.
(1) A method for hot-pressing a steel sheet, the method comprising pressing a steel sheet at 700 ° C. or higher and simultaneously performing a punching process.
（２）一旦プレス成形を行った後、再度鋼板を７００℃以上に加熱し、打ち抜き加工を行うことを特徴とする前記（１）記載の鋼板の熱間プレス成形方法。
（３）先端に穴を有するパンチと、前記穴を移動自在な可動金型と、前記パンチと相対し前記可動金型が移動自在な空洞部を有するダイスを有し、前記パンチ、前記可動金型及び前記ダイスにより鋼板を打抜き自在であることを特徴とする鋼板の熱間プレス成形装置にある。
(2) The hot press forming method for a steel sheet according to (1), wherein the steel sheet is again heated to 700 ° C. or more after being press formed, and punching is performed.
(3) A punch having a hole at the tip, a movable mold that can move through the hole, and a die that has a cavity that faces the punch and through which the movable mold can move. The present invention resides in a hot press forming apparatus for a steel sheet, wherein the steel sheet can be punched out freely by a die and the die.
本発明によれば複雑な形状を有する部材の熱間プレスによる成形が可能であり工業的に大きな価値がある。 According to the present invention, a member having a complicated shape can be formed by hot pressing, which is industrially valuable.
本発明は、熱間プレス成形中に、鋼板のプレス加工及び打ち抜き加工を行う鋼板の熱間プレス成形方法及び装置である。通常、熱間プレスで成形を行う場合、強度が低いことから、延性は高いものの、高温で成形を行うため、鋼板の歪硬化指数（ｎ値）が低く、変形が集中した部位へ更に変形が集中してしまい、高い加工性を得ることは困難である。例えば、鋼板の打ち抜きとその後の穴拡げ加工を行う場合、変形は打ち抜き穴周りに集中し、板厚が薄くなり容易に破断してしまう。 The present invention is a hot-press forming method and apparatus for a steel plate that performs press-working and punching of the steel plate during hot press-forming. Usually, when forming by hot pressing, because the strength is low, the ductility is high, but since the forming is performed at a high temperature, the strain hardening index (n value) of the steel sheet is low, and the deformation further concentrates on the concentrated part. It is difficult to obtain high workability due to concentration. For example, when punching a steel plate and subsequent hole expansion processing, the deformation concentrates around the punched hole, and the plate thickness becomes thin and easily breaks.
そこで本発明者等は、高温での加工性、特に、プレス成形後の打ち抜き加工に着目して研究を行った結果、その一部に穴を有する金型又はパンチを用いプレス成形を行うことで、頭頂部での温度低下を抑制し、頭頂部からの材料流入を促進させることで、金型との接触部での板厚減少を抑制できることを見出した。その後、打ち抜き加工を行うことで、板厚減少部を除去し、所定の部品形状を得ることができる。本発明によれば、プレス成形と打ち抜き加工を同一の行程で行うことができ、大幅な行程の省略を導くことから、製造コストの低下が可能である。さらには、新たに打ち抜きや穴拡げのための設備を設ける必要がなく、経済的にも非常に好ましい。 Therefore, the present inventors conducted research by paying attention to workability at high temperatures, particularly punching after press molding, and as a result, by performing press molding using a die or punch having a hole in a part thereof. The present inventors have found that by suppressing the temperature drop at the top of the head and promoting the material inflow from the top of the head, it is possible to suppress the decrease in the plate thickness at the contact portion with the mold. Thereafter, by performing a punching process, the reduced thickness portion can be removed, and a predetermined part shape can be obtained. According to the present invention, press molding and punching can be performed in the same process, leading to a significant omission of the process, so that the manufacturing cost can be reduced. Furthermore, there is no need to newly provide a facility for punching or expanding a hole, which is very preferable economically.
以下に本発明の実施様態を図１と共に詳細に説明する。
図１は、本発明に係る成形装置の概略図であり、図１（ａ）はプレス成形前、図１（ｂ）はプレス成形中、図１（ｃ）はプレス成形及び打ち抜き加工後の様子をそれぞれ示す図である。また、図１（ｄ）はプレス成形及び打ち抜き加工後の製品の概観を示す図である。まず、図１の（ａ）に示すように、炉から取り出した高温に加熱された鋼板８をプレス成形装置に設置する。
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.
FIG. 1 is a schematic view of a molding apparatus according to the present invention, FIG. 1 (a) is before press molding, FIG. 1 (b) is during press molding, and FIG. 1 (c) is a state after press molding and punching. FIG. Moreover, FIG.1 (d) is a figure which shows the external appearance of the product after press molding and stamping. First, as shown in FIG. 1A, the
鋼板は、オーステナイト（γ）単相域で成形する必要があることから、加熱温度は７００℃以上とする必要がある。しかしながら、加熱温度が高温となりすぎると、炉内での鋼板の酸化に伴う耐食性および塗装性の悪化や、鋼板強度の低下に伴う炉からプレス機までの搬送性の低下が懸念される。さらには、過度の高温加熱は経済性の観点からも好ましくない。このことから、鋼板の加熱温度は１１００℃未満のγ単相域（Ａｒ3 以上）とすることが望ましい。 Since the steel sheet needs to be formed in an austenite (γ) single-phase region, the heating temperature needs to be 700 ° C. or higher. However, if the heating temperature is too high, there is a concern that the corrosion resistance and paintability associated with oxidation of the steel sheet in the furnace will deteriorate, and that the transportability from the furnace to the press machine will decrease due to the decrease in steel sheet strength. Furthermore, excessively high temperature heating is not preferable from the viewpoint of economy. For this reason, it is desirable that the heating temperature of the steel sheet is a γ single phase region (Ar 3 or higher) of less than 1100 ° C.
鋼板８を板抑え３に設置後、鋼板８はプレス成形される。この際、鋼板８はプレス成形と打ち抜き加工を金型から取り出すことなく行うため、先端に穴を有するパンチ２と、前記穴を移動自在な可動金型１と、パンチ２と相対し可動金型１が移動自在な空洞部を有するダイス４を有し、パンチ２、可動金型１及びダイス４により鋼板８を打抜き自在である。先端に穴を有するパンチを用いる理由は、パンチ先端での鋼板との接触を避け、この部位での鋼板の温度低下を避け、成形部への材料流入を促すためである。この結果、板厚の減少や、それに伴う破断を生じることなく、形状の優れた部材を成形可能である。
After installing the
可動金型１は、油圧機構を用いて機械的に稼動する。しかしながら、可動機構を油圧のみに限定するものでなく、ＡＣサーボもしくはクランク等の機構により稼動させたとしても、本発明の効果は発揮される。また、一旦熱間プレス成形を行った後、再度上記と同じ温度に鋼板を加熱し、打ち抜き加工を施したとしても本発明の効果は発揮される。 The movable mold 1 is mechanically operated using a hydraulic mechanism. However, the movable mechanism is not limited to only hydraulic pressure, and the effect of the present invention is exhibited even if the movable mechanism is operated by a mechanism such as an AC servo or a crank. Further, the effect of the present invention is exhibited even if the steel sheet is once again heated to the same temperature as described above and punched after the hot press forming.
更には、図１（ｃ）に示すように、パンチ２、可動金型１及びダイス４を用いて鋼板８の打ち抜き加工を行うことにより、優れた形状の部材を成形可能である。鋼板８はパンチ２及びダイス４に接触していないことから、打ち抜き部位の温度は高いため鋼板強度は低く、成形の際に打ち抜き穴周りに亀裂等の欠陥は発生しない。さらには、鋼板強度が低く、打ち抜き時のパンチ２及びダイス４の摩耗を避けることができるので、経済的にも好ましい。加えて、穴を打ち抜く部位の温度は、その周りのパンチ２及びダイス４が接触している部位よりも温度が高く、パンチによる打ち抜きの際に遅れて焼き入れされることとなる。この結果、打ち抜き穴の周りに圧縮の残留応力が残り、疲労耐久性も向上する。
Furthermore, as shown in FIG. 1C, a member having an excellent shape can be formed by punching the
一方、鋼板８はパンチ２およびダイス４を用いて焼入れされる。このことから、パンチ２及びダイス４の温度は、空気や窒素ガスなどの気体、あるいは、水や油等の液体を用いて冷却することで、３００℃未満、更には、２００℃未満に保つことが望ましい。しかしながら、パンチ２及びダイス４の温度がこの範囲を超えていたとしても、プレス成形後に、成形品を気体や液体を用いて、成形品の冷却及び焼入れが行われるのであれば、何ら問題は生じない。
次に、実施例を用いて、本発明の効果を具体的に説明する。
On the other hand, the
Next, the effects of the present invention will be specifically described with reference to examples.
本発明例では、表１に示す成分を有する鋼を、図１に示すプレス装置を用いて、プレス成形とそれに引き続く打ち抜き加工を行った。比較例として、先端に穴を有さないパンチを用いて張り出し試験を行い、その後、室温で打ち抜き加工を行った。更には、Ａｒ3 以上で打ち抜き加工を行った後、焼き入れ、室温、および、Ａｒ3 以上で穴拡げ試験を行いその成形性を調査した。ただし、成形中鋼板は金型に覆われており、正確な温度測定は困難である。そこで、鋼板を１０００℃まで加熱し、速やかに、成形を行うことでＡｒ3 以上での加工を確保した。 In the example of the present invention, the steel having the components shown in Table 1 was subjected to press forming and subsequent punching using the press apparatus shown in FIG. As a comparative example, an overhang test was performed using a punch having no hole at the tip, and thereafter punching was performed at room temperature. Further, after punching with Ar 3 or more, quenching, room temperature, and hole expansion test with Ar 3 or more were conducted to investigate the moldability. However, during forming, the steel plate is covered with a mold, and accurate temperature measurement is difficult. Therefore, the steel sheet was heated to 1000 ° C., and was quickly formed to ensure processing at Ar 3 or higher.
試験は、５水準の試験を、次の手順にて行った。
（１）鋼板を昇温速度１０℃／秒にて、１０００℃まで加熱した後、この温度にて１００秒保持を行った。その後、加熱された鋼板を図１に示すプレス装置に搬送後、鋼板を板抑えに載置し、先端に穴を有するパンチ２を用いて、成形試験を行った。成形試験条件としては、直径２０．３ｍｍの穴を有するパンチ２を用いて、歪速度１０ｍｍ／秒、成形高さ５０ｍｍで行った。高温での打ち抜きは、直径２０ｍｍの可動金型１、を用いて行った。被加工材には、１．２ｍｍ×１００ｍｍ×１００ｍｍの表１に示す成分の炭素鋼を用いた。この可動金型１が下止点まで来た後、パンチ２により、鋼板の打ち抜き加工を行った。この間、鋼板は、パンチ２、可動金型１及びダイス４と常に接触している。
The test was conducted according to the following procedure in five levels.
(1) The steel plate was heated to 1000 ° C. at a temperature rising rate of 10 ° C./second, and then held at this temperature for 100 seconds. Then, after conveying the heated steel plate to the press apparatus shown in FIG. 1, the steel plate was placed to suppress the plate, and a forming test was performed using the
（２）鋼板を昇温速度１０℃／秒にて、１０００℃まで加熱した後、この温度にて１００秒保持を行った。その後、加熱された鋼板に加工を施さずに水焼入れした。その後、室温において、直径１０ｍｍのパンチ、ダイ径１０．３ｍｍのダイを用いて、打ち抜き加工を行った。穴を穿った材料に対し、室温において、穴拡げ加工を施した。
（３）鋼板を昇温速度１０℃／秒にて、１０００℃まで加熱した後、この温度にて１００秒保持を行った。その後、パンチ２の先端に穴を有さない図１と類似の装置に搬送後、鋼板を板抑えに載置し、熱間プレスを行った後、成形品を取り出し、室温にて、打ち抜き加工を行った。
(2) The steel plate was heated to 1000 ° C. at a temperature rising rate of 10 ° C./second, and then held at this temperature for 100 seconds. Thereafter, the heated steel sheet was water quenched without being processed. Thereafter, punching was performed at room temperature using a punch having a diameter of 10 mm and a die having a die diameter of 10.3 mm. The hole-piercing material was subjected to hole expansion processing at room temperature.
(3) The steel plate was heated to 1000 ° C. at a temperature rising rate of 10 ° C./second, and then held at this temperature for 100 seconds. After that, after transporting to a device similar to that shown in FIG. 1 that does not have a hole at the tip of the
（４）鋼板を、直径１０ｍｍのパンチ、ダイ径１０．３ｍｍのダイを用いて、室温にて打ち抜き加工を行った。その後、鋼板を昇温速度１０℃／秒にて、１０００℃まで加熱した後、この温度にて１００秒保持を行った。その後、加熱された鋼板を穴拡げ試験機に搬送後、板を板抑えに載置し、室温にて、６０°円錐パンチを用いて、穴拡げ試験を行った。ただし、成形後に得られる穴径を（１）の条件と等しくするため、穴直径が２０ｍｍに達した際にパンチを止め試験を終了した。 (4) The steel sheet was punched at room temperature using a punch with a diameter of 10 mm and a die with a die diameter of 10.3 mm. Thereafter, the steel sheet was heated to 1000 ° C. at a heating rate of 10 ° C./second, and then held at this temperature for 100 seconds. Then, after conveying the heated steel plate to a hole-expansion tester, the plate was placed to suppress the plate, and a hole-expansion test was performed at room temperature using a 60 ° conical punch. However, in order to make the hole diameter obtained after molding equal to the condition of (1), the punch was stopped when the hole diameter reached 20 mm, and the test was completed.
（５）まず、鋼板を、直径１０ｍｍのパンチ、ダイ径１０．３ｍｍのダイを用いて、室温にて打ち抜き加工を行った。その後、室温にて６０°円錐パンチを用いて、穴拡げ試験を行った。ただし、成形後に得られる穴径を（１）の条件と等しくするため、穴直径が２０ｍｍに達した際にパンチを止め試験を終了した。できた成形品を、１０℃／秒にて、１０００℃まで加熱した後、この温度にて１００秒保持を行った。その後、鋼板を直接水中に入れ、焼入れを行った。 (5) First, the steel sheet was punched at room temperature using a punch with a diameter of 10 mm and a die with a die diameter of 10.3 mm. Thereafter, a hole expansion test was performed using a 60 ° conical punch at room temperature. However, in order to make the hole diameter obtained after molding equal to the condition of (1), the punch was stopped when the hole diameter reached 20 mm, and the test was completed. The formed product was heated to 1000 ° C. at 10 ° C./second, and then held at this temperature for 100 seconds. Then, the steel plate was directly put into water and quenched.
以上５つの手法にて成形した成形品の強度、側壁部での板厚変化及び成形後の穴周りの亀裂の有無を調査した。成形品の強度に関しては、成形部材の各部位での強度を評価するため、成形品を切断した後、図２に示す各部位の強度をビッカース試験を用いて調査した。その硬度が、５００Ｈｖを上回る部材を十分な焼入れ性を有する成形手法と定義した。板厚変化については、正規品に対して、板厚変化が０．５ｍｍ以内のものを良とした。穴周りの亀裂については、目視にてその有無を観察した。以上の結果を表２に示す。 The strength of the molded product molded by the above five methods, the thickness change at the side wall, and the presence or absence of cracks around the hole after molding were investigated. Regarding the strength of the molded product, in order to evaluate the strength of each part of the molded member, the molded product was cut, and then the strength of each part shown in FIG. 2 was investigated using a Vickers test. A member having a hardness exceeding 500 Hv was defined as a molding technique having sufficient hardenability. As for the plate thickness change, a product having a plate thickness change within 0.5 mm with respect to a regular product was regarded as good. About the crack around a hole, the presence or absence was observed visually. The results are shown in Table 2.
本発明である加工条件（１）は、成形品の硬度は５００Ｈｖ超であり、成形性も良好で、穴周りへの亀裂も存在しなかった。
加工条件（２）は、成形品の硬度は５００Ｈｖ超であり、板厚減少はないものの、水焼入れの際に板が若干反ってしまった。更には、鋼板の強度が非常に高いため、室温にて、穴拡げ加工を行った場合、成形中に穴周りに亀裂が生じてしまい、穴直径を２０ｍｍとすることはできなかった。
In the processing condition (1) according to the present invention, the hardness of the molded product was over 500 Hv, the moldability was good, and there was no crack around the hole.
In the processing condition (2), although the hardness of the molded product was over 500 Hv and there was no reduction in the plate thickness, the plate was slightly warped during water quenching. Furthermore, since the strength of the steel sheet is very high, when hole expansion processing was performed at room temperature, cracks occurred around the hole during forming, and the hole diameter could not be reduced to 20 mm.
加工条件（３）は、成形品の硬度は５００Ｈｖ超であり、十分な焼きが入っていた。しかしながら、板厚変化は０．５ｍｍ以上であり、成形性に劣っていた。また、プレス成形と打ち抜き加工を２工程に分けること、及び、複雑な形状にプレスした後の部材に、打ち抜き加工を行うことから生産性に劣る。 In the processing condition (3), the hardness of the molded product was over 500 Hv, and sufficient baking was included. However, the plate thickness change was 0.5 mm or more, and the moldability was poor. Further, the productivity is inferior because press forming and punching are divided into two steps, and the member after being pressed into a complicated shape is punched.
加工条件（４）に関しては、最初にポンチの先端と板が接するため、この部分での冷却が早く、板が硬化してしまう。それに対し、側壁部は、なかなかダイに接することなく変形を受けるため、板厚減少が激しい。さらには、一部の鋼板においては、成形中に破断にいたるものも存在した。加えて、室温にて打ち抜き加工を行った成形品は、加熱炉より取り出した後、金型の正規の位置へセットするのに、約１０〜３０秒の時間を要し、生産性に劣っていた。また、これに起因して、熱間加工前の板温度が低下してしまい十分な焼きが入らず、硬度が５００Ｈｖを下回るものもあった。 Regarding the processing condition (4), since the tip of the punch and the plate first contact each other, the cooling at this portion is fast and the plate is hardened. On the other hand, since the side wall portion is deformed without being in contact with the die, the plate thickness is greatly reduced. Furthermore, some of the steel plates also broke during forming. In addition, the molded product that has been punched at room temperature takes about 10 to 30 seconds to be set in a normal position of the mold after taking out from the heating furnace, and is inferior in productivity. It was. In addition, due to this, the plate temperature before hot working is lowered and sufficient baking does not occur, and there is a case where the hardness is less than 500 Hv.
加工条件（５）の成形品については、室温にての打ち抜き加工は可能であるものの、その後の穴拡げ加工時に、穴周りに多数の亀裂が生じてしまい、穴径を２０ｍｍとすることができなかった。また、この穴周りに亀裂を有する試験片を、加熱炉で加熱し、取り出し、水中に焼入れを行った場合、熱応力の影響で、試験片形状が若干変化し、かつ、室温での加工時に導入された亀裂が大きくなっていた。 For molded products with the processing condition (5), although punching at room temperature is possible, many cracks are generated around the hole during subsequent hole expansion processing, and the hole diameter can be 20 mm. There wasn't. In addition, when a test piece having cracks around this hole is heated in a heating furnace, taken out, and quenched in water, the shape of the test piece changes slightly due to the effect of thermal stress, and during processing at room temperature The introduced crack was large.
以上述べたように、本発明の熱間プレス方法を用いれば、高強度、かつ、成形性に優れた部材の製造が可能となる。さらには、材料としてＡｌめっき鋼板等のめっき鋼板を用いることで、成形後のスケール除去行程が省略できるため、これら鋼板を熱間プレス用鋼板として用いることが更に望ましい。 As described above, by using the hot pressing method of the present invention, it is possible to produce a member having high strength and excellent moldability. Furthermore, since a scale removal process after forming can be omitted by using a plated steel sheet such as an Al plated steel sheet as a material, it is more desirable to use these steel sheets as a steel sheet for hot pressing.
１ パンチ
２ パンチ
３ 板抑え
４ ダイス
５ カウンターパンチ
６ クッションピン
８ 鋼板
特許出願人 新日本製鉄株式会社
代理人 弁理士 椎 名 彊 他１
1
Patent Applicant Nippon Steel Corporation
Attorney Attorney Shiina and others 1
Claims (3)
A punch having a hole at the tip; a movable mold movable through the hole; and a die having a cavity that is movable opposite to the punch, the punch, the movable mold, and the die A hot press forming apparatus for a steel sheet, wherein the steel sheet can be punched out with a die.
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| JP2003373915A JP2005138111A (en) | 2003-11-04 | 2003-11-04 | Method and equipment for hot press forming of steel sheet |
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| JP2003373915A JP2005138111A (en) | 2003-11-04 | 2003-11-04 | Method and equipment for hot press forming of steel sheet |
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| JP2010000536A (en) * | 2008-06-23 | 2010-01-07 | Unipres Corp | Forming die apparatus for hot press, and hot press-forming method |
| JP2011505491A (en) * | 2007-11-26 | 2011-02-24 | イェスタムプ・ハードテック・アクチエボラーグ | Manufacturing method of coated high strength steel sheet products |
| WO2011132501A1 (en) * | 2010-04-23 | 2011-10-27 | 東プレ株式会社 | Hot press molding method enabling hardness adjustment |
| CN102602195A (en) * | 2011-01-20 | 2012-07-25 | 杨丽云 | Pen tube and forming and manufacturing method thereof |
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| JP2010000536A (en) * | 2008-06-23 | 2010-01-07 | Unipres Corp | Forming die apparatus for hot press, and hot press-forming method |
| CN102883833A (en) * | 2010-04-23 | 2013-01-16 | 东普雷株式会社 | Hot press molding method enabling hardness adjustment |
| WO2011132501A1 (en) * | 2010-04-23 | 2011-10-27 | 東プレ株式会社 | Hot press molding method enabling hardness adjustment |
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| JP2013027903A (en) * | 2011-07-28 | 2013-02-07 | Daihatsu Motor Co Ltd | Hot press molding method |
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| JP2017507781A (en) * | 2013-12-17 | 2017-03-23 | ティッセンクルップ スチール ヨーロッパ アーゲーＴｈｙｓｓｅｎｋｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ Ａｇ | Method and apparatus for manufacturing hot formed wheel disks |
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