JP5357587B2 - Method for producing press-formed product made of aluminum alloy material and method for producing press-formed product made of light alloy material - Google Patents

Method for producing press-formed product made of aluminum alloy material and method for producing press-formed product made of light alloy material Download PDF

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JP5357587B2
JP5357587B2 JP2009068471A JP2009068471A JP5357587B2 JP 5357587 B2 JP5357587 B2 JP 5357587B2 JP 2009068471 A JP2009068471 A JP 2009068471A JP 2009068471 A JP2009068471 A JP 2009068471A JP 5357587 B2 JP5357587 B2 JP 5357587B2
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JP2010012517A (en
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哲也 増田
康夫 高木
信也 為広
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株式会社神戸製鋼所
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本発明は、自動車パネル、自動車用部品、その他鉄道車両等の輸送機用のパネル、或いは電気機械部品等に用いられるアルミニウム合金をはじめとする軽合金材料製のプレス成形品を、被加工材から製造する際に、絞り成形工程時に被加工材に発生するしわやスプリングバック、R形状の曲率半径過大といった形状不良を、プレス成形品の製造時に矯正することができるアルミニウム合金材料製プレス成形品の製造方法および軽合金材料製プレス成形品の製造方法に関するものである。   The present invention relates to a press-formed product made of a light alloy material including an aluminum alloy used for an automobile panel, an automobile part, a panel for a transport machine such as a railway vehicle, or an electric machine part. A press-formed product made of an aluminum alloy material that can correct shape defects such as wrinkles, springbacks, and excessive R-shaped curvature radii that occur in the work piece during the draw-forming process during manufacture of the press-formed product. The present invention relates to a manufacturing method and a manufacturing method of a press-formed product made of a light alloy material.
近年の自動車は、安全性の向上や快適装備の充実といった背景から車体重量が増加する傾向にある。また、自動車をはじめとする輸送機全体の車体分野では、排気ガス等による地球環境問題に対して、軽量化による燃費の向上も追求されている。そのため、従来から自動車などの輸送機の車体に用いられている鋼板に代えて、より軽量なアルミニウム合金板をはじめとする軽合金の圧延板によるプレス成形品や押出型材が採用されることが多くなってきている。また、電気機械部品等にもアルミニウム合金板をはじめとする軽合金材料製のプレス成形品が採用されることが多くなってきている。   In recent years, automobile weight tends to increase due to the background of improving safety and enhancing comfort equipment. In addition, in the body field of the entire transportation equipment including automobiles, improvement of fuel efficiency by pursuing light weight is pursued for global environmental problems caused by exhaust gas and the like. For this reason, press-formed products and extruded molds made of light alloy rolled plates, such as lighter aluminum alloy plates, are often used instead of steel plates that have been used in the body of transportation equipment such as automobiles. It has become to. In addition, press-molded products made of light alloy materials such as aluminum alloy plates are increasingly used for electromechanical parts and the like.
圧延板を用いて複雑な形状の絞り成形を行う場合には、絞り成形品にしわが発生することがある。そこで、従来から絞り成形品を製造するために多く用いられてきた鋼板では、しわの発生を抑制するために、ビードの設置、その調整、或いはしわ押さえ力を上げるなどして部分的にブランク流入を抑制する対策がとられてきた。この対策を施すことによりしわは発生しにくくなるものの、プレス割れが発生しやすくなる傾向があるため、これらを両立するべく調整が図られてきた。   When drawing a complex shape using a rolled plate, wrinkles may occur in the drawn product. Therefore, in steel plates that have been widely used to produce drawn products from the past, in order to suppress the generation of wrinkles, it is possible to partially introduce blanks by installing beads, adjusting them, or increasing the wrinkle holding force. Measures to suppress this have been taken. By taking this measure, wrinkles are less likely to occur, but since press cracks tend to occur, adjustments have been made to achieve both.
しかしながら、軽合金板、特にアルミニウム合金板は、鋼板などに比べると成形性が劣る傾向があることから、プレス成形割れが発生しやすく、しわの発生とプレス割れの発生を同時に抑制することは非常に困難であるという問題があった。   However, light alloy plates, especially aluminum alloy plates, tend to be inferior in formability compared to steel plates, etc., so press forming cracks are likely to occur, and it is very difficult to suppress the occurrence of wrinkles and press cracks at the same time. There was a problem that it was difficult.
このような背景から、絞り成形時にしわや割れが発生することを抑制するために、従来から様々な提案がなされているが、それらの提案の何れもが、絞り成形を行う装置、すなわち絞り成形工程に何らかの改善を施し、しわの発生を抑制しようとするものであった。   Against this background, various proposals have heretofore been made in order to suppress the occurrence of wrinkles and cracks during drawing, but any of these proposals is an apparatus for drawing, that is, drawing. Some improvements were made to the process to suppress the generation of wrinkles.
特許文献1〜7に記載された技術は、その何れもが絞り成形工程の絞り成形を行う装置に何らかの改善を施している。特許文献1には、ブランクのフランジ部を挟着する板押さえとダイスを、夫々に設けた加熱ヒーターで加熱することで、成形時のブランクのフランジ部を加熱する技術が記載されている。特許文献2には、電気ヒーターが内部に設けられたしわ押さえと、電気ヒーターが内部に設けられたダイスで、板材を挟持すると共にこの挟持部分を加熱し、同時に加熱の影響を受けるパンチの端面が接触する板材の部分を、パンチの反対側に設けた冷却風供給装置からの冷却気体で冷却する技術が記載されている。   All of the techniques described in Patent Documents 1 to 7 provide some improvement to an apparatus that performs drawing in the drawing process. Patent Document 1 describes a technique of heating a blank flange portion at the time of molding by heating a plate presser and a die sandwiching the flange portion of the blank with respective heaters. Patent Document 2 discloses an end face of a punch that is affected by heating while holding a plate material with a wrinkle presser provided with an electric heater inside and a die provided with an electric heater inside. Describes a technique for cooling a portion of a plate material in contact with a cooling gas from a cooling air supply device provided on the opposite side of the punch.
また、特許文献3には、電気ヒーターが内部に設けられたしわ押さえと、電気ヒーターが内部に設けられたダイスで、板材を挟持すると共にこの挟持部分を加熱し、同時に加熱の影響を受けるパンチの端面が接触する板材の部分を、パンチの反対側に設けた非酸化性ガス供給装置から吹き出す非酸化性ガスで冷却する技術が記載されている。特許文献4には、ダイスおよび/または板押さえの取り付け部に電熱ヒーター等の加熱媒体を設置すると共に、パンチに貫通路を穿孔して冷却水等の冷却媒体を還流させ、そのダイス、板押さえ、パンチを用いて金属薄板を深絞り加工する技術が記載されている。   Further, Patent Document 3 discloses a punch which sandwiches a plate material and heats the sandwiched portion with a wrinkle presser provided with an electric heater inside and a die provided with an electric heater inside, and is simultaneously affected by heating. A technique is described in which the portion of the plate material that comes into contact with the end face is cooled with a non-oxidizing gas blown from a non-oxidizing gas supply device provided on the opposite side of the punch. In Patent Document 4, a heating medium such as an electric heater is installed in a die and / or plate press attachment part, and a through passage is formed in the punch to recirculate a cooling medium such as cooling water. A technique for deep drawing a metal sheet using a punch is described.
更には、特許文献5には、温間プレス加工に関する技術として、ヒーターを埋め込んだダイス及びしわ押さえ金具と、冷媒を循環させる配管を埋め込んだポンチでアルミニウム合金板を温間成形する技術が記載されている。特許文献6には、温間成形に関する技術として、ヒーターを内蔵するパンチ、ダイス、及びしわ押さえを具備する成形装置を用いて、アルミニウム合金板を温間成形する技術が記載されている。特許文献7には、ダイとワーク保持具(しわ押さえ)の少なくとも一方に金型ベース部とは別体になったワーク押面部を設け、そのワーク押面部を複数のワーク加熱ブロックに分け、そのワーク加熱ブロックを各々独立して温度制御することで、アルミニウム合金板等のワークを温間でプレス成形する技術が記載されている。   Furthermore, Patent Document 5 describes a technique relating to warm press working, in which an aluminum alloy plate is warm-formed with a die embedded with a heater and a wrinkle holding metal fitting, and a punch embedded with a pipe for circulating a refrigerant. ing. Patent Document 6 describes a technique for warm forming an aluminum alloy plate using a forming apparatus including a punch, a die, and a wrinkle presser with a built-in heater as a technique related to warm forming. In Patent Document 7, at least one of a die and a work holder (wrinkle presser) is provided with a work pressing surface part that is a separate body from the mold base part, and the work pressing surface part is divided into a plurality of work heating blocks. A technique is described in which a workpiece such as an aluminum alloy plate is press-formed warm by controlling the temperature of each workpiece heating block independently.
しかしながら、特許文献1〜7に記載された技術は、その何れもが絞り成形工程の絞り成形を行う装置自体にヒーター等の温度制御装置を内蔵するものである。これらの場合には、ポンチ、ダイスそのものを加熱あるいは冷却する必要があることから、非常に金型構造が複雑になり、たとえできたとしても金型寿命が短くなりやすいという問題があった。また、被加工材を加工温度まで加熱するため、被加工材を表裏から挟持して保持する時間が必要となるなど、通常の冷間プレス成形と比較して生産性が著しく低下するという問題もあった。これらの問題が発生することを避けるためには、絞り成形工程に先立って加熱工程を追加設置しなければならなかった。   However, all of the techniques described in Patent Documents 1 to 7 incorporate a temperature control device such as a heater in an apparatus itself that performs the drawing process in the drawing process. In these cases, since it is necessary to heat or cool the punch and the die itself, there is a problem that the mold structure becomes very complicated, and even if possible, the mold life is likely to be shortened. In addition, since the work material is heated to the processing temperature, it takes time to hold the work material from the front and back, and the productivity is significantly reduced compared to ordinary cold press forming. there were. In order to avoid the occurrence of these problems, a heating process had to be additionally installed prior to the drawing process.
また、アルミニウム合金板をはじめとする金属板に絞り成形等のプレス成形を施した場合、弾性回復による変形、すなわちスプリングバックが生じるという問題もある。この問題を解消するためにも従来から様々な提案がなされている。   In addition, when press forming such as drawing is performed on a metal plate such as an aluminum alloy plate, there is a problem that deformation due to elastic recovery, that is, springback occurs. Various proposals have been made in order to solve this problem.
特許文献8と特許文献9には、絞り成形において、金属板の弾性回復の発生が予想される部位を予め把握し、プレス下死点前で加熱して軟化させ、絞り成形により生じる残留応力を低減させる技術が記載されている。また、特許文献10には、金型の加圧拘束力が付与されている成形品の特定の部位に対して、成形品自体を含む二枚の金属板同士を重ね合わせた状態でその重合方向に通電することにより局部加熱処理を施して、特定の部位での応力を調整する技術が記載されている。   In Patent Document 8 and Patent Document 9, in drawing, the portion where the elastic recovery of the metal plate is expected to be grasped in advance, and softened by heating before the bottom dead center of the press, the residual stress generated by drawing is described. Techniques for reducing are described. Further, in Patent Document 10, the polymerization direction in a state where two metal plates including the molded product itself are overlapped with each other on a specific part of the molded product to which the pressure restraining force of the mold is applied. Describes a technique for adjusting the stress at a specific portion by applying a local heat treatment by energizing the current.
しかしながら、これらの技術は、その何れもが絞り成形の段階で、スプリングバックが発生することを抑制しようとする技術であって、スプリングバックが発生してしまった場合の絞り成形後の工程で矯正を行うことができる技術ではなかった。   However, these techniques are all techniques for suppressing the occurrence of springback at the stage of drawing, and are corrected in the process after drawing when springback has occurred. It wasn't a technology that could do that.
また、自動車パネルにアルミニウム合金板を用いる場合、従来から自動車パネルに多く用いられている鋼板と比較して成形限界が低く、鋼板と同様のR形状に成形しようとした場合、割れが発生するという問題があるため、比較的大きい曲率半径にて部品設計される。この場合、曲率半径の小さい鋼板部品と接合する際にR部が干渉してしまうという問題があった。その解決のため、多段プレス工程として曲率半径を逐次小さくしていく手法を採用することが考えられるが、今度はプレス工程が多くなるという新たな問題を発生してしまう。   In addition, when using an aluminum alloy plate for an automobile panel, the forming limit is lower than that of a steel plate that has been conventionally used for an automobile panel, and cracking occurs when attempting to form an R shape similar to that of a steel plate. Due to problems, parts are designed with a relatively large radius of curvature. In this case, there is a problem that the R portion interferes with the steel plate part having a small curvature radius. In order to solve this problem, it is conceivable to adopt a method of successively reducing the radius of curvature as a multi-stage pressing process, but this time a new problem of increasing the pressing process occurs.
特開平4−351229号公報JP-A-4-351229 特開平5−237558号公報JP-A-5-237558 特開平5−309425号公報JP-A-5-309425 特開平11−309518号公報Japanese Patent Laid-Open No. 11-309518 特開2007−125601号公報JP 2007-125601 A 特開2006−205244号公報JP 2006-205244 A 特許第3380286号公報Japanese Patent No. 3380286 特開平1−233019号公報Japanese Patent Laid-Open No. 1-233019 特開平7−155856号公報JP-A-7-155856 特開2007−118014号公報JP 2007-1118014 A
本発明は、上記従来の問題を解決せんとしてなされたもので、アルミニウム合金をはじめとする軽合金材料製のプレス成形品を、被加工材から製造する際に、絞り成形工程時に被加工材に発生するしわやスプリングバック、R形状の曲率半径過大といった形状不良を、絞り成形工程後の後加工工程で確実に矯正することができるアルミニウム合金材料製プレス成形品の製造方法および軽合金材料製プレス成形品の製造方法を提供することを課題とするものである。   The present invention has been made as a solution to the above-described conventional problems. When a press-molded product made of a light alloy material such as an aluminum alloy is manufactured from a work material, the work material is used during the draw forming process. Forming method of aluminum alloy material press-molded product and light alloy material press capable of reliably correcting generated defects such as wrinkles, springback and excessive radius of curvature of R shape in post-processing step after drawing process It is an object of the present invention to provide a method for manufacturing a molded product.
請求項1記載の発明は、絞り成形工程と後加工工程を順に経てアルミニウム合金材料製の被加工材からプレス成形品を製造するアルミニウム合金材料製プレス成形品の製造方法において、後加工工程時の、加圧体により被加工材を挟持した際の前記被加工材の表面温度(T)と、前記加圧体による被加工材の挟持で成形を行う前後の曲率半径の比(R/R )を、下記2式を満足する条件として、前記加圧体による前記被加工材の挟持で、前記被加工材に形成されたR形状を、更に小さい曲率半径の形状に成形すると共に、後加工工程で前記被加工材を加工する金型に、その被加工材を表裏から挟持する加圧体を付設し、それら加圧体のうち少なくとも一方の加圧体を加熱体とし、その加熱体により前記被加工材の表面温度を100〜400℃に加熱した状態で、並行して前記後加工工程での加工を行うことを特徴とするアルミニウム合金材料製プレス成形品の製造方法である。
R/R ≧1.0−0.005×T
R/R ≧0.002×T−0.3
但し、R/R ≧0.3、Rは成形後の曲率半径、R は成形前の曲率半径である。
The invention according to claim 1 is a method of manufacturing a press-formed product made of an aluminum alloy material from a work piece made of an aluminum alloy material through a drawing process and a post-processing process in order . The ratio of the surface temperature (T) of the workpiece when the workpiece is clamped by the pressurization body and the radius of curvature before and after forming by clamping the workpiece by the pressurizer (R / R 0) ) As a condition satisfying the following two formulas, the R shape formed on the work material is formed into a shape having a smaller radius of curvature by holding the work material by the pressure body, and post-processing A die for processing the workpiece in the process is provided with a pressure body for sandwiching the workpiece from the front and back, and at least one of the pressure bodies is a heating body, and the heating body The surface temperature of the workpiece is 100 to 40 ℃ while heating to a method for producing a parallel aluminum alloy material manufactured by press-molded article, characterized in that for machining in the later processing steps.
R / R 0 ≧ 1.0−0.005 × T
R / R 0 ≧ 0.002 × T−0.3
However, R / R 0 ≧ 0.3, R is a radius of curvature after molding, and R 0 is a radius of curvature before molding.
請求項2記載の発明は、前記加熱体は、前記金型のベース部からは独立して設けられており、単独で温度制御されることを特徴とする請求項記載のアルミニウム合金材料製プレス成形品の製造方法である。 According to a second aspect of the invention, the heating body is provided independently from the base portion of the mold, an aluminum alloy material made press of claim 1, wherein the temperature controlled independently It is a manufacturing method of a molded article.
請求項3記載の発明は、前記後加工工程は、トリム工程、ピアス工程、曲げ工程のうち、いずれか一つ以上の工程であることを特徴とする請求項1または2に記載のアルミニウム合金材料製プレス成形品の製造方法である。 The invention according to claim 3 is the aluminum alloy material according to claim 1 or 2 , wherein the post-processing step is one or more of a trimming step, a piercing step, and a bending step. It is a manufacturing method of a press-formed product.
請求項4記載の発明は、絞り成形工程と後加工工程を順に経て軽合金材料製の被加工材からプレス成形品を製造する軽合金材料製プレス成形品の製造方法において、後加工工程時の、加圧体により被加工材を挟持した際の前記被加工材の表面温度(T)と、前記加圧体による被加工材の挟持で成形を行う前後の曲率半径の比(R/R)を、下記2式を満足する条件として、前記加圧体による前記被加工材の挟持で、前記被加工材に形成されたR形状を、更に小さい曲率半径の形状に成形すると共に、後加工工程で前記被加工材を加工する金型に、その被加工材を表裏から挟持する加圧体を付設し、それら加圧体のうち少なくとも一方の加圧体を加熱体とし、その加熱体により前記被加工材の表面温度を100〜400℃に加熱した状態で、並行して前記後加工工程での加工を行うことを特徴とする軽合金材料製プレス成形品の製造方法である。
R/R≧1.0−0.005×T
R/R≧0.002×T−0.3
但し、R/R≧0.3、Rは成形後の曲率半径、Rは成形前の曲率半径である。
According to a fourth aspect of the present invention, there is provided a light alloy material press-molded product manufacturing method in which a press-formed product is manufactured from a light alloy material work material through a drawing process and a post-processing process in order . , the surface temperature of the workpiece at the time of clamping the workpiece (T) by pressing body, the ratio of the front and rear radius of curvature forming is carried out by pinching of the workpiece by the pressing body (R / R 0 ) As a condition satisfying the following two formulas, the R shape formed on the work material is formed into a shape having a smaller radius of curvature by holding the work material by the pressure body, and post-processing A die for processing the workpiece in the process is provided with a pressure body for sandwiching the workpiece from the front and back, and at least one of the pressure bodies is a heating body, and the heating body In a state where the surface temperature of the workpiece is heated to 100 to 400 ° C. In parallel a method for producing a light alloy material manufactured by press-molded article, characterized in that for machining in the later processing steps.
R / R 0 ≧ 1.0−0.005 × T
R / R 0 ≧ 0.002 × T−0.3
However, R / R 0 ≧ 0.3, R is a radius of curvature after molding, and R 0 is a radius of curvature before molding.
本発明の請求項1記載のアルミニウム合金材料製プレス成形品の製造方法によると、アルミニウム合金材料製のプレス成形品を、被加工材から製造する際に、絞り成形工程時に被加工材に発生するしわやスプリングバック、R形状の曲率半径過大といった形状不良を、絞り成形工程後の後加工工程で加圧加熱することで確実に矯正することができる。また、絞り成形工程時に前記被加工材に形成されたR形状を、更に小さい曲率半径の形状に成形するための追加加工工程を必要とせず、絞り成形工程後の後加工工程で並行して被加工材のR形状を、更に小さい曲率半径の形状に、適切な条件で被加工材に割れを発生させることなく確実に成形することができる。 According to the method for manufacturing a press-formed product made of an aluminum alloy material according to claim 1 of the present invention, when a press-formed product made of an aluminum alloy material is manufactured from the work material, it is generated in the work material during the drawing process. Shape defects such as wrinkles, springbacks, and excessive radius of curvature of the R shape can be reliably corrected by pressurizing and heating in the post-processing step after the draw forming step. Further, there is no need for an additional processing step for forming the R shape formed on the workpiece during the draw forming step into a shape having a smaller radius of curvature, and in parallel with the post-processing step after the draw forming step. The R shape of the workpiece can be reliably formed into a shape having a smaller radius of curvature without cracking the workpiece under appropriate conditions.
本発明の請求項記載のアルミニウム合金材料製プレス成形品の製造方法によると、加熱体の熱が金型のベース部に伝達してしまい被加工材に熱が十分に伝わらず、しわやスプリングバック、形状Rの矯正が十分にできなくなるといった問題が発生することがなくなる。 According to the method for manufacturing a press-formed product made of an aluminum alloy material according to claim 2 of the present invention, the heat of the heating body is transmitted to the base portion of the mold, and the heat is not sufficiently transmitted to the workpiece, so that wrinkles and springs are formed. The problem that the back and the shape R cannot be sufficiently corrected does not occur.
本発明の請求項記載のアルミニウム合金材料製プレス成形品の製造方法によると、絞り成形工程の後加工工程が、トリム工程、ピアス工程、曲げ工程の何れの場合であっても、また、複数の工程であっても、しわやスプリングバック、R形状の曲率半径過大といった形状不良の矯正を確実に行うことができる。 According to the method for manufacturing a press-formed product made of an aluminum alloy material according to claim 3 of the present invention, the post-processing step of the draw forming step is any of a trim step, a piercing step, and a bending step, Even in this process, it is possible to surely correct shape defects such as wrinkles, springback, and excessive curvature radius of the R shape.
本発明の請求項記載の軽合金材料製プレス成形品の製造方法によると、軽合金材料製のプレス成形品を、被加工材から製造する際に、絞り成形工程時に被加工材に発生するしわやスプリングバック、R形状の曲率半径過大といった形状不良を、絞り成形工程後の後加工工程で加圧加熱することで確実に矯正することができる。また、絞り成形工程時に前記被加工材に形成されたR形状を、更に小さい曲率半径の形状に成形するための追加加工工程を必要とせず、絞り成形工程後の後加工工程で並行して被加工材のR形状を、更に小さい曲率半径の形状に、適切な条件で被加工材に割れを発生させることなく確実に成形することができる。 According to the light alloy material press-molded product manufacturing method according to claim 4 of the present invention, when a light alloy material press-molded product is manufactured from the workpiece, it is generated in the workpiece during the drawing process. Shape defects such as wrinkles, springbacks, and excessive radius of curvature of the R shape can be reliably corrected by pressurizing and heating in the post-processing step after the draw forming step. Further, there is no need for an additional processing step for forming the R shape formed on the workpiece during the draw forming step into a shape having a smaller radius of curvature, and in parallel with the post-processing step after the draw forming step. The R shape of the workpiece can be reliably formed into a shape having a smaller radius of curvature without cracking the workpiece under appropriate conditions.
本発明のアルミニウム合金材料製プレス成形品の製造方法および軽合金材料製プレス成形品の製造方法で、プレス成形品を製造する工程を示す縦断面図であり、(a)は絞り成形工程を、(b)は後加工工程のうちトリム(切断)工程を、(c) は後加工工程のうち曲げ工程を夫々示す。It is a longitudinal cross-sectional view which shows the process of manufacturing a press-formed product in the manufacturing method of the press-formed product made of the aluminum alloy material and the light-molded material press-formed product of the present invention, and (a) shows the drawing process. (B) shows a trimming (cutting) process in the post-processing process, and (c) shows a bending process in the post-processing process. 本発明のプレス成形品の製造方法に基づき製造したプレス成形品を示し、左図はプレス成形品の全容写真を、右図はプレス成形品の絞り加工された要部の表面写真を夫々示す。The press-formed product manufactured based on the manufacturing method of the press-formed product of the present invention is shown, the left figure shows the entire photograph of the press-formed article, and the right figure shows the surface photograph of the main part of the press-formed product that has been drawn. 図2の左図のA〜A’の位置で、表面に発生したしわの高さを示すグラフ図である。It is a graph which shows the height of the wrinkle which generate | occur | produced on the surface in the position of A-A 'of the left figure of FIG. 加熱体での供試材表面の加熱温度と、プレス成形品の表面に発生したしわ高さの関係を示すグラフ図である。It is a graph which shows the relationship between the heating temperature of the surface of a test material in a heating body, and the wrinkle height which generate | occur | produced on the surface of the press-molded article. 90°V曲げ金型により被加工材をプレス成形する状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which press-molds a to-be-processed material with a 90 degreeV bending metal mold | die. スプリングバック角度を説明するための縦断面図である。It is a longitudinal cross-sectional view for demonstrating a springback angle. 加熱体により加熱された供試材の表面温度(金型温度)と、スプリングバック角度の関係を示すグラフ図である。It is a graph which shows the relationship between the surface temperature (mold temperature) of the test material heated by the heating body, and a springback angle. 実施例3,4で、プレス成形品を被加工材から製造する際の被加工材のR成形限界を評価するために用いた供試材を示し、(a)は平面図、(b)は正面図である。In Example 3 and 4, the test material used in order to evaluate the R shaping | molding limit of the workpiece at the time of manufacturing a press-molded article from a workpiece is shown, (a) is a top view, (b) is It is a front view. 成形限界R比(R/R)と、成形時の加工材の表面温度(T)の関係を示すグラフ図である。It is a graph which shows the relationship between a shaping | molding limit R ratio (R / R0 ) and the surface temperature (T) of the workpiece at the time of shaping | molding.
以下、本発明を添付図面に示す実施形態に基づいて更に詳細に説明する。   Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.
本発明により製造されるプレス成形品1は自動車パネル材のような成形品であって、例えば、図1に示すような、絞り成形工程と後加工工程を順に経て被加工材1aから製造することができる。図1(a)に示す製造工程は絞り成形工程であり、図1(b)と(c)に示す製造工程は後加工工程である。図1に示す実施形態の場合、後加工工程には、図1(b)に示すトリム(切断)工程と、図1(c)に示す曲げ工程がある。   The press-molded product 1 manufactured according to the present invention is a molded product such as an automobile panel material, and is manufactured from a workpiece 1a through a drawing process and a post-processing process in order as shown in FIG. Can do. The manufacturing process shown in FIG. 1A is a drawing process, and the manufacturing process shown in FIGS. 1B and 1C is a post-processing process. In the case of the embodiment shown in FIG. 1, the post-processing steps include a trim (cutting) step shown in FIG. 1 (b) and a bending step shown in FIG. 1 (c).
図1(a)に示す製造工程は絞り成形工程であって、アルミニウム合金をはじめとする軽合金材料製の被加工材1aが、ポンチ4、ダイス5、ブランクホルダー6で成るプレス成形用金型を用いた絞り成形で所望の形状に成形される。   The manufacturing process shown in FIG. 1A is a drawing process, and a press molding die in which a work material 1 a made of a light alloy material such as an aluminum alloy is composed of a punch 4, a die 5, and a blank holder 6. Is formed into a desired shape by drawing using
図1(b)に示す製造工程は後加工工程のトリム(切断)工程であって、切断用の金型3を用いて、被加工材1aの外周部が所望の形状に切断される。この工程の金型3には、切断加工時の被加工材1aを表裏(図1では上下)から挟持する一対の加圧体2aが付設されている。これら加圧体2aのうち少なくとも一方は加熱体2であり、加熱体2は、切断加工時の被加工材1aを挟持してその発熱により図1(a)に示す絞り成形工程で被加工材1aの表面に発生したしわや、その絞り成形工程後に被加工材1aに発生したスプリングバックを矯正し、また、絞り成形工程において一度成形されたR部を更に小さな径のR形状に成形する。尚、上下の加圧体2aは、両方とも加熱体2であることが望ましい。   The manufacturing process shown in FIG. 1B is a trim (cutting) process of a post-processing process, and the outer peripheral portion of the workpiece 1a is cut into a desired shape by using a cutting die 3. The mold 3 in this step is provided with a pair of pressurizing bodies 2a that sandwich the workpiece 1a at the time of cutting from the front and back (up and down in FIG. 1). At least one of these pressurizing bodies 2a is a heating body 2, and the heating body 2 sandwiches the workpiece 1a at the time of cutting and heats the workpiece in the drawing process shown in FIG. The wrinkles generated on the surface of 1a and the spring back generated in the workpiece 1a after the drawing process are corrected, and the R part once formed in the drawing process is formed into an R shape having a smaller diameter. In addition, it is desirable that both the upper and lower pressurizing bodies 2a are heating bodies 2.
加熱体2は、切断用の金型3のベース部3aとは独立して設けられた金属ブロックであり、内部に埋め込まれたシーズヒーター等の加熱手段により単独で温度制御される。尚、加熱体2の加熱手段は、誘導加熱、通電加熱等のどのような加熱手段であっても構わない。   The heating body 2 is a metal block provided independently of the base portion 3a of the cutting die 3 and is independently temperature controlled by heating means such as a sheathed heater embedded therein. In addition, the heating means of the heating body 2 may be any heating means such as induction heating or energization heating.
この加熱体2は、しわやスプリングバックが発生している等で矯正が必要な部位に設けられる。被加工材1aの矯正が必要な部位が、その中央部付近の場合は、図1(b)に示すように、金型3の加工部とは別に独立して設けられるが、被加工材1aの矯正が必要な部位が、被加工材1aの切断加工部の近傍の場合は、金型3のワーク押さえパッド3bに隣接して設けられたり、或いはワーク押さえパッド3b自体が加熱体2であったりしても良い。   The heating element 2 is provided at a site where correction is required due to wrinkles or springback. When the part that needs to be corrected of the workpiece 1a is in the vicinity of the central portion thereof, as shown in FIG. 1B, the workpiece 1a is provided separately from the processing portion of the mold 3, but the workpiece 1a is not provided. If the part that needs to be corrected is in the vicinity of the cut portion of the workpiece 1a, it is provided adjacent to the workpiece pressing pad 3b of the mold 3 or the workpiece pressing pad 3b itself is the heating element 2. You may do it.
また、加熱体2が金型3のベース部3aと接触したり、一体となって設けられていると、加熱体2で発生する熱が金型3のベース部3aに伝達してしまうことになり、加熱体2による被加工材1aの矯正が必要な部位の加熱が不十分になったり、温度維持が困難になったりしてしまう。その問題を解消するためにはこの構成のままでは必要以上の加熱が必要になるので、加熱体2と金型3のベース部3aは、熱的に縁が切られた状態で独立して設けられることが望ましい。特に図示はしないが、具体的には、加熱体2と金型3のベース部3aの間に断熱材が設けられたり、スプリングが介装されたりして相互に直接接触しない状態で設けられる。   Further, if the heating body 2 is in contact with the base portion 3 a of the mold 3 or is provided integrally, the heat generated in the heating body 2 is transferred to the base portion 3 a of the mold 3. Therefore, the heating of the part that needs to be corrected of the workpiece 1a by the heating body 2 becomes insufficient, or the temperature maintenance becomes difficult. In order to solve the problem, the structure requires heating more than necessary. Therefore, the heating body 2 and the base 3a of the mold 3 are provided independently in a state where the edges are thermally cut. It is desirable that Although not particularly illustrated, specifically, a heat insulating material is provided between the heating body 2 and the base portion 3a of the mold 3 or a spring is interposed so that they are not in direct contact with each other.
また、加熱体2の表面は、焼き付き防止のための表面処理が施されていることが望ましい。表面処理としては、硬質クロムめっき、TD処理、PVD(TiC、TiN、TiAlN)、CVD(TiC、TiN、TiCN、DLC)等を挙げることができる。   Moreover, it is desirable that the surface of the heating element 2 is subjected to a surface treatment for preventing seizure. Examples of the surface treatment include hard chrome plating, TD treatment, PVD (TiC, TiN, TiAlN), CVD (TiC, TiN, TiCN, DLC) and the like.
図1(c)に示す製造工程は後加工工程の曲げ工程であって、トリム工程による外周部の切断加工が終了した被加工材1aの外周部を、更に曲げ加工用の金型7を用いて曲げ加工し、最終的なプレス成形品1とする。尚、図1(c)には特に加圧体2aおよび加熱体2を図示していないが、図1(b)と同様に加圧体2aおよび加熱体2が設けられていても良い。   The manufacturing process shown in FIG. 1 (c) is a bending process as a post-processing process, and the outer peripheral portion of the workpiece 1a that has been subjected to the cutting process of the outer peripheral portion by the trimming process is further used with a bending die 7. To be the final press-formed product 1. In addition, although the pressurization body 2a and the heating body 2 are not specifically shown in FIG.1 (c), the pressurization body 2a and the heating body 2 may be provided similarly to FIG.1 (b).
以上、図1に基づいて、本発明の一実施形態を説明したが、この実施形態は、絞り成形工程→後加工工程(トリム工程→曲げ工程)という順の製造工程で、被加工材1aからプレス成形品1を製造する実施形態である。後加工工程は、トリム工程、曲げ工程の単独でも良く、トリム工程と曲げ工程のほかに、ピアス(穴あけ)工程を選択することもできる。また、これら3種の工程を適宜組み合わせて複数の工程よりなる後加工工程としても良い。後加工工程が複数の工程よりなる場合は、少なくとも一つの工程に、加圧体2aおよび加熱体2が設けられておれば良い。   As described above, one embodiment of the present invention has been described based on FIG. 1, but this embodiment is a manufacturing process in the order of a drawing process → a post-processing process (trim process → bending process). 1 is an embodiment for producing a press-formed product 1. The post-processing step may be a trim step or a bending step, and a piercing (drilling) step can be selected in addition to the trim step and the bending step. Moreover, it is good also as a post-processing process which consists of several processes combining these 3 types of processes suitably. When the post-processing step includes a plurality of steps, the pressurizing body 2a and the heating body 2 may be provided in at least one step.
本発明では、後加工工程に加圧体2aおよび加熱体2を設けたが、もし、絞り成形工程に加圧体2aおよび加熱体2を設けることを想定した場合、必然的にポンチ4やダイス5に近接して加圧体2aおよび加熱体2を設置することとなり、ポンチ4やダイス5への熱伝導を避けることが困難になるか、たとえその熱伝導を避けることができても構造を非常に複雑な構造とする必要がある。また、荷重が最もかかるプレス成形用金型に加圧体2aおよび加熱体2を設置することとなり、設置自体が困難になるか、たとえ設置することができても、プレス成形用金型の強度が低下する等の悪影響があり、金型寿命が短くなってしまう。   In the present invention, the pressurizing body 2a and the heating body 2 are provided in the post-processing step. However, if it is assumed that the pressurizing body 2a and the heating body 2 are provided in the drawing process, the punch 4 and the die are inevitably provided. Therefore, it is difficult to avoid heat conduction to the punch 4 and the die 5 or even if the heat conduction can be avoided. It is necessary to have a very complicated structure. In addition, the pressurizing body 2a and the heating body 2 are installed in the press molding mold that is most loaded, and the installation itself becomes difficult, or even if it can be installed, the strength of the press molding mold. There is an adverse effect such as lowering the mold life, and the mold life is shortened.
これに対し、本発明のように、後加工工程に加圧体2aおよび加熱体2を設ける場合、加熱体2を金型3のベース部3aから離して独立して設けることができ、金型3の構造を大きく変更する必要もない。また、金型3の寿命にも影響を与えることもない。   On the other hand, when the pressurizing body 2a and the heating body 2 are provided in the post-processing step as in the present invention, the heating body 2 can be provided independently from the base portion 3a of the mold 3, There is no need to greatly change the structure of 3. Further, the life of the mold 3 is not affected.
次に、本発明のアルミニウム合金材料製プレス成形品の製造方法および軽合金材料製プレス成形品の製造方法に用いる軽合金材料、加熱体2により加熱した際の被加工材1aの表面温度、加圧体2aでの加圧力、その加圧時間について説明する。   Next, the light alloy material used in the manufacturing method of the aluminum alloy material press-molded product and the light alloy material press-molded product of the present invention, the surface temperature of the workpiece 1a when heated by the heating body 2, The pressurizing force in the pressure body 2a and the pressurizing time will be described.
本発明のアルミニウム合金材料製プレス成形品の製造方法および軽合金材料製プレス成形品の製造方法に用いる軽合金材料については特に規定しないが、アルミニウム合金、特に自動車部品用途に用いられる3000系アルミニウム合金、5000系アルミニウム合金、6000系アルミニウム合金を用いることが有効である。   The light alloy material used in the manufacturing method of the aluminum alloy material press-molded product and the light alloy material press-molded product manufacturing method of the present invention is not particularly specified, but aluminum alloy, particularly 3000 series aluminum alloy used for automobile parts. It is effective to use a 5000 series aluminum alloy or a 6000 series aluminum alloy.
加熱体2により加熱した際の被加工材1aの表面温度が、100℃未満の場合は、素材強度への影響が少なく、しわ矯正効果や、残留応力低減による形状矯正効果(スプリングバックの矯正効果)を得ることができない。一方、被加工材1aの表面温度が400℃を超えると、加熱体2による加熱、温度維持が困難となる。好ましくは、被加工材1aの表面温度は300℃以下とする必要がある。従って、加熱体2により加熱した際の被加工材1aの表面温度は、100〜400℃、更に好ましくは100〜300℃とする。   When the surface temperature of the workpiece 1a when heated by the heating body 2 is less than 100 ° C., there is little influence on the material strength, and the wrinkle correction effect and the shape correction effect by reducing the residual stress (spring back correction effect) ) Can not get. On the other hand, when the surface temperature of the workpiece 1a exceeds 400 ° C., it becomes difficult to heat and maintain the temperature with the heating element 2. Preferably, the surface temperature of the workpiece 1a needs to be 300 ° C. or less. Therefore, the surface temperature of the workpiece 1a when heated by the heating body 2 is 100 to 400 ° C, more preferably 100 to 300 ° C.
加圧体2aでの加圧力については特に限定しないが、しわおよびスプリングバックを矯正する場合は、0.1MPa以上なければ十分な効果を得ることができなくなる。特に加圧力の上限はないが、金型強度の観点からその上限は50MPaとすることが望ましい。絞り成形工程において一度成形されたR形状を、更に小さい曲率半径の形状に成形する場合については、加圧力の上下限は特に設定しない。   The pressure applied by the pressure member 2a is not particularly limited. However, when wrinkles and springback are corrected, a sufficient effect cannot be obtained unless the pressure is 0.1 MPa or more. Although there is no particular upper limit of the applied pressure, the upper limit is preferably 50 MPa from the viewpoint of mold strength. In the case where the R shape once formed in the drawing step is formed into a shape having a smaller radius of curvature, the upper and lower limits of the pressing force are not particularly set.
加圧体2aでの加圧時間についても特に限定しない。必要な加圧力に到達した直後に開放しても(これを加圧時間0秒とする。)、しわ矯正効果や、スプリングバック矯正効果を得ることはできる。尚、5秒以上加圧しても効果が飽和し、生産性が低下することになるので、5秒未満の加圧で十分である。   There is no particular limitation on the pressurizing time in the pressurizing body 2a. Even if it is released immediately after reaching the required applied pressure (this is set to a pressurization time of 0 seconds), it is possible to obtain a wrinkle correction effect and a springback correction effect. It should be noted that even if pressurization is performed for 5 seconds or more, the effect is saturated and productivity is lowered, so pressurization for less than 5 seconds is sufficient.
また、絞り成形工程において一度成形されたR形状を、更に小さい所望の曲率半径の形状に成形する追加工を行う場合においては、加圧体2aにより被加工材1aを挟持した際の被加工材1aの表面温度(T)と、加圧体2aによる被加工材1aの挟持で成形を行う前後の曲率半径の比(R/R)が、次の2式を満足する条件となるようにして成形する必要がある。 In addition, in the case of performing additional processing for forming the R shape once formed in the drawing process into a shape having a smaller desired radius of curvature, the work material when the work material 1a is sandwiched by the pressure member 2a. The surface temperature (T) of 1a and the ratio of the radius of curvature (R / R 0 ) before and after forming by sandwiching the workpiece 1a by the pressurizing body 2a are such that the following two expressions are satisfied. Need to be molded.
その2式は、R/R≧1.0−0.005×Tと、R/R≧0.002×T−0.3であり、但し、R/R≧0.3である。尚、Rは成形後、Rは成形前の曲率半径を夫々示す。この2式を満足する条件で追加工を実施することで、追加工時にR部に割れが発生することを防止することができる。尚、この2式を、追加工時の成形を実施する際の条件としたのは以下の理由からである。 The two formulas are R / R 0 ≧ 1.0−0.005 × T and R / R 0 ≧ 0.002 × T−0.3, provided that R / R 0 ≧ 0.3. . R represents the radius of curvature after molding, and R 0 represents the radius of curvature before molding. By performing the additional work under the conditions satisfying these two formulas, it is possible to prevent the R portion from cracking during the additional work. In addition, the reason why these two formulas are used as conditions for carrying out the molding during the additional work is as follows.
室温での絞り成形工程で被加工材1aには歪みが蓄積されるが、その歪みは後加工工程で回復して、成形余裕度が高まる。この歪み回復効果は、加熱体2での加熱温度が高くなるほど顕著になる傾向がある。以上のことから、追加工による成形限界R比(R/R)は、R/R≧1.0−0.005×Tという条件式で規定することができる。 Although distortion is accumulated in the workpiece 1a in the drawing process at room temperature, the distortion is recovered in the post-processing process, and the forming margin is increased. This strain recovery effect tends to become more prominent as the heating temperature in the heating element 2 increases. From the above, the forming limit R ratio (R / R 0 ) due to additional processing can be defined by the conditional expression R / R 0 ≧ 1.0−0.005 × T.
一方、温度が高くなると素材(被加工材1a)の引張強さは低下する傾向がある。ポンチ肩Rとダイ肩Rの間で大きい引張力が作用する場合は、破断に至る場合があることから、追加工による成形限界R比である(R/R)は、R/R≧0.002×T−0.3という条件式でも規定される。 On the other hand, when the temperature increases, the tensile strength of the material (workpiece 1a) tends to decrease. When a large tensile force acts between the punch shoulder R and the die shoulder R, it may lead to breakage. Therefore, the forming limit R ratio (R / R 0 ) by additional processing is R / R 0 ≧ It is also defined by a conditional expression of 0.002 × T−0.3.
以上の2式は、実験、検討を鋭意重ねることで求め出した条件式であるが、特に加熱のための保持時間は必要としない。よって、汎用プレスに使用される金型を用いて成形することが可能で、特殊な成形条件とする必要はない。   The above two formulas are conditional formulas obtained by earnestly conducting experiments and studies, but do not require a holding time for heating. Therefore, it is possible to mold using a mold used for a general-purpose press, and it is not necessary to use special molding conditions.
<実施例1>
実施例1では、プレス成形品を被加工材から製造する際に被加工材の表面に発生したしわの高さを評価した。供試材として用いた軽合金材料は5000系アルミニウム合金であり、本発明のプレス成形品の製造方法に基づき、加熱体により供試材の表面を25℃(室温)〜300℃に加熱した。その際の加圧体(加熱体)での加圧時間は0秒或いは10秒、加圧力は0.8MPa或いは1.6MPaの何れかとした。得られたプレス成形品の表面に発生したしわの高さを測定した。尚、合格判定基準は300μm以下とした。
<Example 1>
In Example 1, the height of wrinkles generated on the surface of the workpiece when the press-molded product was manufactured from the workpiece was evaluated. The light alloy material used as the test material was a 5000 series aluminum alloy, and the surface of the test material was heated to 25 ° C. (room temperature) to 300 ° C. by a heating body based on the method for producing a press-formed product of the present invention. In this case, the pressurizing time with the pressurizing body (heating body) was 0 second or 10 seconds, and the applied pressure was either 0.8 MPa or 1.6 MPa. The height of wrinkles generated on the surface of the obtained press-molded product was measured. The acceptance criterion was 300 μm or less.
図2は実際に本発明のプレス成形品の製造方法に基づき製造したプレス成形品を示し、左図(写真)はプレス成形品の全容を、右図(写真)はプレス成形品の絞り加工された要部の状態を夫々示す。尚、図2の写真の表面の模様は、表面形状がわかりやすいようにするため印刷した模様である。右図のA〜A’の位置で表面に発生したしわの高さを示すのが図3である。図3によると、絞り成形工程で発生したしわ(図3では矯正前として示す。)を、後加工工程で加圧することで矯正することができるが(図3では加圧温度:室温として示す。)、加圧時に加熱することにより更に確実に矯正することができていることがわかる。しわの高さ(グラフの上下限の差)は矯正前では800μm以上であるのに対し、加圧温度:200℃と300℃の場合は、しわの高さは合格判定基準の300μm以下となっており、表面に発生したしわを確実に矯正することができている。   FIG. 2 shows a press-molded product actually manufactured based on the method of manufacturing a press-molded product according to the present invention, the left figure (photo) shows the entire press-molded article, and the right figure (photo) shows the press-molded product drawn. The state of the main part is shown respectively. Note that the pattern on the surface of the photograph in FIG. 2 is a printed pattern so that the surface shape can be easily understood. FIG. 3 shows the height of wrinkles generated on the surface at positions A to A ′ in the right figure. According to FIG. 3, wrinkles generated in the drawing process (shown as before correction in FIG. 3) can be corrected by pressurizing in the post-processing process (shown as pressurization temperature: room temperature in FIG. 3). It can be seen that correction can be made more reliably by heating at the time of pressurization. The wrinkle height (difference between the upper and lower limits of the graph) is 800 μm or more before correction, whereas when the pressing temperature is 200 ° C. and 300 ° C., the wrinkle height is 300 μm or less, which is the acceptance criterion. Therefore, wrinkles generated on the surface can be reliably corrected.
図4には、加熱体での供試材表面の加熱温度(図4では加圧温度として示す。)と、プレス成形品の表面に発生したしわ高さの関係を示す。加熱体での供試材表面の加熱温度が、100〜400℃の間の200℃と300℃の場合のしわ高さは、加圧力、加圧時間に関係なく全て合格判定基準の300μm以下となっているのに対し、加熱体での供試材表面の加熱温度が、100℃未満や室温の場合では、しわ高さは300μm超となり、プレス成形品としては不適なものとなる。   FIG. 4 shows the relationship between the heating temperature of the surface of the test material with the heating element (shown as the pressing temperature in FIG. 4) and the height of wrinkles generated on the surface of the press-formed product. The wrinkle height when the heating temperature of the surface of the test material at the heating body is between 200 ° C. and 300 ° C. between 100 ° C. and 400 ° C. is 300 μm or less of the acceptance criterion, regardless of the applied pressure and pressurizing time. On the other hand, when the heating temperature of the surface of the test material with the heating body is less than 100 ° C. or room temperature, the wrinkle height exceeds 300 μm, which is not suitable as a press-molded product.
<実施例2>
実施例2では、プレス成形品を被加工材から製造する際に発生するスプリングバックについて評価した。供試材として用いた軽合金材料は6000系アルミニウム合金であり、その板厚は1mmである。図5に示すように、この供試材を90°V曲げ金型によりプレス成形し、更に加熱体を付設した同形状の金型によって加圧保持し、開放後の供試材の角度変化(スプリングバック角度=A−A)を測定した。図6に示すスプリングバック角度が、5°以下を適とし、4°以下を最適として夫々合格とする。
<Example 2>
In Example 2, spring back generated when a press-formed product was manufactured from a workpiece was evaluated. The light alloy material used as the test material is a 6000 series aluminum alloy, and the plate thickness is 1 mm. As shown in FIG. 5, this specimen is press-molded with a 90 ° V-bending mold and further held under pressure with the same-shaped mold provided with a heating element, and the angle change of the specimen after opening ( Springback angle = A−A 0 ) was measured. The spring back angle shown in FIG. 6 is 5 ° or less, and 4 ° or less is optimum, and each is acceptable.
尚、加熱体により加熱された供試材の表面温度は25℃(室温)〜300℃であり、その際の金型(加圧体)での加圧時間は0秒或いは10秒、加圧力は0.1MPa、0.8MPa、1.6MPaの何れかとした。   The surface temperature of the test material heated by the heating body is 25 ° C. (room temperature) to 300 ° C., and the pressurizing time in the mold (pressurizing body) at that time is 0 second or 10 seconds, the applied pressure Was set to 0.1 MPa, 0.8 MPa, or 1.6 MPa.
図7によると、加熱体により加熱された供試材の表面温度(=金型温度)が100℃以上で、加圧力、加圧時間に関係なくスプリングバック角度は全て5°以下となっていることがわかる。更には、加熱体により加熱された供試材の表面温度(=金型温度)を100℃以上とした上で、加圧力を0.5MPa以上(0.8MPa、1.6MPa)とすれば、スプリングバック角度は全て4°以下になることがわかる。   According to FIG. 7, the surface temperature (= mold temperature) of the test material heated by the heating body is 100 ° C. or more, and the springback angles are all 5 ° or less regardless of the applied pressure and pressurization time. I understand that. Furthermore, when the surface temperature of the test material heated by the heating body (= mold temperature) is set to 100 ° C. or higher and the applied pressure is set to 0.5 MPa or higher (0.8 MPa, 1.6 MPa), It can be seen that the springback angles are all 4 ° or less.
<実施例3>
実施例3では、プレス成形品を被加工材から製造する際の被加工材のR成形限界を評価した。供試材として用いた軽合金材料は5000系アルミニウム合金であり、その板厚は1mmである。まず、室温にてプレス成形を行って、図8に示すような形状の肩RがR10mmのプレス成形品を得て供試材とした。その供試材を、表面温度が25℃(室温)〜300℃になるようにして加熱体で加熱した状態で、肩Rのうち図8に*R10として示した部位の曲率半径が、夫々R10mmからR3mm、R5mm、R7mmになるようにして再度プレス成形を行った。このプレス成形後に、*R10として示した部位の成形割れの発生有無について評価した。尚、加圧体での加圧時間は0秒、成形荷重は10トンとした。
<Example 3>
In Example 3, the R molding limit of the workpiece when the press-formed product was manufactured from the workpiece was evaluated. The light alloy material used as the test material is a 5000 series aluminum alloy, and the plate thickness is 1 mm. First, press molding was performed at room temperature to obtain a press-molded product having a shoulder R having a shape of R10 mm as shown in FIG. In the state where the test material was heated with a heating body so that the surface temperature was 25 ° C. (room temperature) to 300 ° C., the radius of curvature of the portion indicated as * R10 in FIG. Then, press molding was performed again so as to obtain R3 mm, R5 mm, and R7 mm. After this press molding, the presence or absence of molding cracks at the site indicated as * R10 was evaluated. The pressurizing time with the pressurizing body was 0 second and the molding load was 10 tons.
表1によると、25℃(室温)のままでは、割れが発生しない成形は不可能であったが、加熱温度が80℃の場合、R7mmまでの成形が可能であり、加熱温度が100℃の場合、R5mmまでの成形が可能である。また、加熱温度が200℃と300℃の場合は、R3mmまで全ての成形が可能であった。   According to Table 1, molding without cracking was impossible at 25 ° C. (room temperature), but when the heating temperature was 80 ° C., molding up to R7 mm was possible, and the heating temperature was 100 ° C. In this case, molding up to R5 mm is possible. In addition, when the heating temperature was 200 ° C. and 300 ° C., all moldings up to R 3 mm were possible.
<実施例4>
実施例4では、プレス成形品を被加工材から製造する際の被加工材のR成形限界を評価した。供試材、および室温でのプレス成形品は実施例3と同様である。その供試材を、表面温度が25℃(室温)〜400℃になるようにして加熱体で加熱した状態で、肩Rのうち図8に*R10として示した部位の曲率半径が、夫々R10mmからR2mm、R3mm、R5mm、R7mmになるようにして再度プレス成形を行った。このプレス成形後に、*R10として示した部位の成形割れの発生有無について評価した。尚、加圧体での加圧時間は0秒、成形荷重は10トンとした。その試験結果を表2に示す。
<Example 4>
In Example 4, the R forming limit of the workpiece when the press-formed product was manufactured from the workpiece was evaluated. The test material and the press-formed product at room temperature are the same as in Example 3. In the state where the test material was heated with a heating body so that the surface temperature was 25 ° C. (room temperature) to 400 ° C., the radius of curvature of the portion indicated as * R10 in FIG. Then, press molding was performed again so as to obtain R2 mm, R3 mm, R5 mm, and R7 mm. After this press molding, the presence or absence of molding cracks at the site indicated as * R10 was evaluated. The pressurizing time with the pressurizing body was 0 second and the molding load was 10 tons. The test results are shown in Table 2.
また、成形限界R比(R/R)と、成形時の加工材の表面温度(T)の関係を図9に示す。25℃(室温)では成形限界R比0.7でも割れが発生したが、成形温度(成形時の加工材の表面温度)が100℃の場合の成形限界R比は0.5、成形温度が200℃の場合の成形限界R比は0.3であった。この結果は、R/R≧1.0−0.005×Tという条件式での規定が正しいことを示している。一方、成形温度が300℃の場合の成形限界R比は0.3、成形温度が400℃の場合の成形限界R比は0.5であった。この結果は、R/R≧0.002×T−0.3という条件式での規定が正しいことを示している。また200℃および300℃での成形限界R比は0.3であった。この結果はR/R≧0.3という規定が正しいことを示している。 Further, FIG. 9 shows the relationship between the molding limit R ratio (R / R 0 ) and the surface temperature (T) of the workpiece during molding. At 25 ° C (room temperature), cracking occurred even at a molding limit R ratio of 0.7, but when the molding temperature (surface temperature of the workpiece during molding) was 100 ° C, the molding limit R ratio was 0.5 and the molding temperature was The molding limit R ratio at 200 ° C. was 0.3. This result shows that the definition in the conditional expression R / R 0 ≧ 1.0−0.005 × T is correct. On the other hand, the molding limit R ratio when the molding temperature was 300 ° C. was 0.3, and the molding limit R ratio when the molding temperature was 400 ° C. was 0.5. This result shows that the definition in the conditional expression R / R 0 ≧ 0.002 × T−0.3 is correct. The molding limit R ratio at 200 ° C. and 300 ° C. was 0.3. This result shows that the definition of R / R 0 ≧ 0.3 is correct.
1…プレス成形品
1a…被加工材
2…加熱体
2a…加圧体
3、7…金型
3a…金型ベース部
3b…ワーク押さえパッド
4…ポンチ
5…ダイス
6…ブランクホルダー
DESCRIPTION OF SYMBOLS 1 ... Press molded product 1a ... Work material 2 ... Heating body 2a ... Pressurizing body 3, 7 ... Mold 3a ... Mold base part 3b ... Work holding pad 4 ... Punch 5 ... Die 6 ... Blank holder

Claims (4)

  1. 絞り成形工程と後加工工程を順に経てアルミニウム合金材料製の被加工材からプレス成形品を製造するアルミニウム合金材料製プレス成形品の製造方法において、
    後加工工程時の、加圧体により被加工材を挟持した際の前記被加工材の表面温度(T)と、前記加圧体による被加工材の挟持で成形を行う前後の曲率半径の比(R/R )を、下記2式を満足する条件として、前記加圧体による前記被加工材の挟持で、前記被加工材に形成されたR形状を、更に小さい曲率半径の形状に成形すると共に、
    後加工工程で前記被加工材を加工する金型に、その被加工材を表裏から挟持する加圧体を付設し、それら加圧体のうち少なくとも一方の加圧体を加熱体とし、
    その加熱体により前記被加工材の表面温度を100〜400℃に加熱した状態で、並行して前記後加工工程での加工を行うことを特徴とするアルミニウム合金材料製プレス成形品の製造方法。
    R/R ≧1.0−0.005×T
    R/R ≧0.002×T−0.3
    但し、R/R ≧0.3、Rは成形後の曲率半径、R は成形前の曲率半径である。
    In the manufacturing method of the press-formed product made of aluminum alloy material, in which the press-formed product is manufactured from the work material made of aluminum alloy material through the draw forming step and the post-processing step in order,
    The ratio of the surface temperature (T) of the workpiece when the workpiece is clamped by the pressure body and the radius of curvature before and after forming by clamping the workpiece by the pressurizer during the post-processing step (R / R 0 ) as a condition satisfying the following two formulas, the R shape formed on the workpiece is formed into a shape with a smaller radius of curvature by sandwiching the workpiece with the pressure body As well as
    A die that processes the workpiece in a post-processing step is provided with a pressure body that sandwiches the workpiece from the front and back, and at least one of the pressure bodies is a heating body,
    A method for producing a press-formed product made of an aluminum alloy material, wherein the post-processing step is performed in parallel in a state where the surface temperature of the workpiece is heated to 100 to 400 ° C by the heating body.
    R / R 0 ≧ 1.0−0.005 × T
    R / R 0 ≧ 0.002 × T−0.3
    However, R / R 0 ≧ 0.3, R is a radius of curvature after molding, and R 0 is a radius of curvature before molding.
  2. 前記加熱体は、前記金型のベース部からは独立して設けられており、単独で温度制御されることを特徴とする請求項記載のアルミニウム合金材料製プレス成形品の製造方法。 The heating body is provided independently from the base portion of the mold process according to claim 1, wherein the aluminum alloy material manufactured by press-molded article, characterized in that it is solely the temperature control.
  3. 前記後加工工程は、トリム工程、ピアス工程、曲げ工程のうち、いずれか一つ以上の工程であることを特徴とする請求項1または2に記載のアルミニウム合金材料製プレス成形品の製造方法。 The method of manufacturing a press-formed product made of an aluminum alloy material according to claim 1 or 2 , wherein the post-processing step is one or more of a trimming step, a piercing step, and a bending step.
  4. 絞り成形工程と後加工工程を順に経て軽合金材料製の被加工材からプレス成形品を製造する軽合金材料製プレス成形品の製造方法において、
    後加工工程時の、加圧体により被加工材を挟持した際の前記被加工材の表面温度(T)と、前記加圧体による被加工材の挟持で成形を行う前後の曲率半径の比(R/R)を、下記2式を満足する条件として、前記加圧体による前記被加工材の挟持で、前記被加工材に形成されたR形状を、更に小さい曲率半径の形状に成形すると共に、
    後加工工程で前記被加工材を加工する金型に、その被加工材を表裏から挟持する加圧体を付設し、それら加圧体のうち少なくとも一方の加圧体を加熱体とし、
    その加熱体により前記被加工材の表面温度を100〜400℃に加熱した状態で、並行して前記後加工工程での加工を行うことを特徴とする軽合金材料製プレス成形品の製造方法。
    R/R≧1.0−0.005×T
    R/R≧0.002×T−0.3
    但し、R/R≧0.3、Rは成形後の曲率半径、Rは成形前の曲率半径である。
    In a light alloy material press-molded product manufacturing method for manufacturing a press-molded product from a light alloy material work material through a drawing process and a post-processing process in order,
    The ratio of the surface temperature (T) of the workpiece when the workpiece is clamped by the pressure body and the radius of curvature before and after forming by clamping the workpiece by the pressurizer during the post-processing step (R / R 0 ) as a condition satisfying the following two formulas, the R shape formed on the workpiece is formed into a shape with a smaller radius of curvature by sandwiching the workpiece with the pressure body As well as
    A die that processes the workpiece in a post-processing step is provided with a pressure body that sandwiches the workpiece from the front and back, and at least one of the pressure bodies is a heating body,
    A method for producing a press-formed product made of a light alloy material, wherein the post-processing step is performed in parallel with the surface temperature of the workpiece being heated to 100 to 400 ° C by the heating element.
    R / R 0 ≧ 1.0−0.005 × T
    R / R 0 ≧ 0.002 × T−0.3
    However, R / R 0 ≧ 0.3, R is a radius of curvature after molding, and R 0 is a radius of curvature before molding.
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