JP2007175722A - Apparatus and method for carrying heated metal sheet - Google Patents

Apparatus and method for carrying heated metal sheet Download PDF

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JP2007175722A
JP2007175722A JP2005374813A JP2005374813A JP2007175722A JP 2007175722 A JP2007175722 A JP 2007175722A JP 2005374813 A JP2005374813 A JP 2005374813A JP 2005374813 A JP2005374813 A JP 2005374813A JP 2007175722 A JP2007175722 A JP 2007175722A
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metal plate
plate material
curved surface
support member
heated
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JP5286636B2 (en
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Tetsuo Shima
哲男 嶋
Yuichi Ishimori
裕一 石森
Hiroshi Fukuchi
弘 福地
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Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrying technology and a heating technology for a metal sheet, which are sufficiently applicable for a hot press forming technology for molding a heated metal sheet with a metal die, more specifically, to provide a carrying technology for the metal sheet capable of stably and easily carrying the heated metal sheet and to provide a heating technology suited for the carrying technology. <P>SOLUTION: An apparatus for carrying the metal sheet is equipped with a metal sheet supporting member 3 for supporting a heated metal sheet from under the lower side of the sheet, wherein the part of a metal sheet supporting member 3 that is brought into contact with a metal sheet 1 has a convex curved surface, which is convex upward or downward with respect to the metal sheet 1, or has a wavelike curved surface, which is convex upward and downward. Further, there is disclosed a carrying method using this supporting member and a method for hot-press-molding the metal sheet which is carried by this carrying method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は金属板材の搬送技術および加熱技術に関し、特に加熱された金属板材を安定かつ容易に搬送することができる加熱された金属板材の搬送技術およびこれに適した金属板材の加熱技術に関する。さらに、本発明はこのような搬送技術等を応用した熱間プレス成形技術に関する。   The present invention relates to a metal plate material conveyance technique and a heating technique, and more particularly to a heated metal plate material conveyance technique capable of stably and easily conveying a heated metal plate material and a metal plate material heating technique suitable for the technique. Furthermore, the present invention relates to a hot press molding technique using such a transport technique.

金属板材のプレス成形は、生産性が高く、寸法精度に優れ、また、プレス製品間の強度ばらつきが少なく品質が安定していることから、自動車、機械、電気機器、輸送用機器等の製造に広く用いられている最も一般的な加工方法である。
しかし、近年におけるプレス製品、特に自動車部品には軽量化等の観点から高強度化が求められており、これにより成形性の低下、特にスプリングバック等の発生による形状凍結性の低下を招来し、複雑な形状をしたプレス製品を製造することが困難となっている。 Metal sheet press molding is highly productive, excellent in dimensional accuracy, and stable in quality with little variation in strength between pressed products, making it suitable for manufacturing automobiles, machinery, electrical equipment, transportation equipment, etc. It is the most common processing method widely used.
However, press products in recent years, especially automobile parts, are required to have high strength from the viewpoint of weight reduction, etc., and this leads to a decrease in formability, particularly a decrease in shape freezing due to the occurrence of a springback, It has become difficult to manufacture a press product having a complicated shape.

このため、金属板材のプレス業界においては、加熱した金属板材を金型を用いて成形する熱間プレス成形技術が注目されている。熱間プレス成形は、金属板材を高温に加熱した状態でプレス成形するため、材料強度の低下した金属板材は、金型の成形面に沿って素直に変形し、複雑な形状であっても優れた寸法精度で成形することができる。また、成形後は金型抜熱効果により急冷するためスプリングバッグが発生せず、形状凍結性に優れ、プレス製品の寸法精度を向上させることができる。   For this reason, in the press industry of a metal plate material, hot press forming technology for forming a heated metal plate material using a mold is attracting attention. Hot press molding is press-molded with the metal plate heated to a high temperature, so the metal plate with reduced material strength deforms straight along the molding surface of the mold and is excellent even in complex shapes. Can be molded with high dimensional accuracy. Moreover, since it cools rapidly after shaping | molding by the die heat removal effect, a spring bag does not generate | occur | produce, it is excellent in shape freezing property, and can improve the dimensional accuracy of a press product.

熱間プレスを行うに際しては、図１（ａ）に示すように加熱炉等の加熱装置の中に設置された支持部材に被成形材たる金属板材を搭載して高温かつ均一に加熱するのが一般的である。また、このように高温かつ均一に加熱された金属板材を温度低下や温度むらが生じないように金型まで搬送するのが理想とされている。
しかし、図１（ｂ）に示すように、加熱された金属板材は弾性係数および降伏応力、または０．２％耐力等が低下することから加熱前の状態から大きく変形する。したがって、当該金属板材を金型まで搬送しようにも支持部材から搬送装置に金属板材を移送すること自体が困難であり、また、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制することも困難であった。さらには、搬送した金属板材を金型に搭載することや位置決めすることも困難であった。このため、プレス製品間の強度ばらつきが少なく品質が安定しているというプレス成形の特質を十分に発揮することができず、ハンドリング性改善の技術開発がプレス業界における喫緊の課題の一つとなっている。 When performing hot pressing, as shown in FIG. 1A, a metal plate material as a molding material is mounted on a support member installed in a heating apparatus such as a heating furnace and heated uniformly at a high temperature. It is common. In addition, it is ideal that the metal plate heated in this way at a high temperature and uniformly be transported to the mold so as not to cause a temperature drop or temperature unevenness.
However, as shown in FIG. 1B, the heated metal plate is greatly deformed from the state before heating because the elastic modulus, yield stress, 0.2% proof stress and the like are lowered. Therefore, it is difficult to transfer the metal plate material from the support member to the transfer device even if the metal plate material is transferred to the mold, and the temperature drop and uneven temperature due to contact heat removal with the transfer device are suppressed. It was also difficult to do. Furthermore, it is difficult to mount and position the conveyed metal plate material on the mold. For this reason, it is not possible to fully demonstrate the characteristics of press forming that there is little variation in strength between pressed products and the quality is stable, and technical development for improving handling properties has become an urgent issue in the press industry. Yes.

このため、金型から遠く離れた加熱装置で金属板材を加熱し、これを金型まで搬送するのではなく、プレス装置内において金属板材を加熱する方法が提案されている。例えば、パンチとダイの間にセットした金属板材に複数の電極を取り付け、相対する電極間に電力を供給してジュール熱を発生させ、これにより均一に加熱した金属板材を熱間プレスする方法が開示されている（例えば、特許文献１参照）。
しかし、金型にセットするたびに金属板材に複数の電極を取り付けなければならず、しかもジュール熱によって加熱するので生産性が著しく低下し、生産性が要求される金属板材のプレス成形に当該方法を適用するには実用上かなりの問題があった。 For this reason, a method has been proposed in which the metal plate material is heated in the press apparatus, instead of heating the metal plate material with a heating device far from the mold and transporting it to the mold. For example, there is a method in which a plurality of electrodes are attached to a metal plate material set between a punch and a die, electric power is supplied between the opposing electrodes to generate Joule heat, and thereby the uniformly heated metal plate material is hot pressed. It is disclosed (for example, see Patent Document 1).
However, each time it is set in the mold, a plurality of electrodes must be attached to the metal plate material, and the heating is performed by Joule heat, so the productivity is remarkably lowered, and this method is used for press forming of a metal plate material that requires productivity. There were considerable problems in practical application.

一方、加熱炉等の加熱装置の中に設置された支持部材に金属板材を搭載して加熱し、これを金型まで搬送する従来技術を踏襲する場合には、支持部材による支持間隔を狭くしたり、支持部材と金属板材との接触面積を増加させて金属板材の変形を抑制し、少なくとも支持部材から搬送装置へ移送する際のハンドリング性を改善する方法も考えられる。しかし、支持部材から搬送装置へ移送する際のハンドリング性のみを改善しても、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制することはできない。すなわち、搬送装置による搬送段階や金型に搭載する段階におけるハンドリング性の改善も必要なところ、これを実現するためには搬送装置の支持点を増加したり、金属板材との接触面積を増加させなければならず、このために搬送装置との接触抜熱による温度低下や温度むらの発生を抑制することはできなかった。すなわち、ハンドリング性の改善と温度低下や温度むらの抑制とはトレードオフの関係にあり、両者を同時に満たすことはできなかった。   On the other hand, in the case of following a conventional technique in which a metal plate material is mounted on a support member installed in a heating device such as a heating furnace and heated to a mold, the support interval by the support member is reduced. Alternatively, it is conceivable to increase the contact area between the support member and the metal plate material to suppress the deformation of the metal plate material, and at least improve the handling property when transferring from the support member to the transport device. However, even if only the handling property at the time of transfer from the support member to the transport device is improved, it is not possible to suppress the occurrence of temperature drop or temperature unevenness due to contact heat removal with the transport device. In other words, it is necessary to improve handling at the transport stage by the transport device and the stage of mounting on the mold. To achieve this, the support points of the transport device are increased or the contact area with the metal plate is increased. For this reason, it has not been possible to suppress the occurrence of temperature drop and temperature unevenness due to contact heat removal with the conveying device. That is, improvement in handling property and suppression of temperature drop and temperature unevenness are in a trade-off relationship, and both cannot be satisfied at the same time.

以上は、加熱炉等の加熱装置の中に設置された支持部材に金属板材を搭載して加熱し、これを金型まで搬送する熱間プレス成形技術を例として説明したが、加熱したことによって弾性係数等が低下しているハンドリング性の劣悪な金属板材を安定かつ容易に搬送することができる搬送技術の開発は、金属板材のプレス業界のみならず、熱間圧延などを扱う鉄鋼業者や溶融めっき等を扱う表面処理・表面改質業者など加熱された金属板材を扱う産業界においても強く望まれている。
特開２００２−２４８５２５号公報 The above is an example of the hot press molding technology in which a metal plate material is mounted on a support member installed in a heating device such as a heating furnace and heated, and this is conveyed to a mold. The development of transport technology that can stably and easily transport metal plates with poor handling properties that have a reduced elastic modulus has been developed not only by the metal plate press industry but also by steel companies that handle hot rolling, etc. There is also a strong demand in the industry that handles heated metal sheets, such as surface treatment and surface reformers that handle plating.
JP 2002-248525 A

本発明の解決すべき課題は、加熱された金属板材を金型を用いて成形する熱間プレス成形技術にも十分応用することのできる金属板材の搬送技術および加熱技術、より具体的には加熱された金属板材を安定かつ容易に搬送することができる金属板材の搬送技術およびこれに適した加熱技術を提供することである。   The problem to be solved by the present invention is that a metal plate material conveying technology and a heating technology, more specifically heating, which can be sufficiently applied to a hot press forming technology for forming a heated metal plate material using a mold. Another object of the present invention is to provide a metal plate material conveyance technique and a heating technique suitable for the metal plate material that can be conveyed stably and easily.

本発明者は、上記課題を解決すべく数多くの理論検討および実験検討を行った結果、以下の知見を得た。
（Ａ）前記したように加熱された金属板材のハンドリング性が低下する最大の要因は、加熱したことによって金属板材の弾性係数および降伏応力または０．２％耐力等が低下し、弾性変形および塑性変形が容易になっていることである。したがって、何らかの方法によって金属板材の剛性を増加させることができれば、金属板材のハンドリング性が改善されること。
（Ｂ）剛性を増加させる方法としては、金属板材にその後の加工の支障とならない所定の形状を付与し、当該形状の付与によって一時的に搬送すべき金属板材の断面２次モーメントおよび断面係数を増加させる方法が容易かつ低廉であること。 As a result of many theoretical studies and experimental studies to solve the above problems, the present inventor has obtained the following knowledge.
(A) As described above, the biggest factor that the handling property of the heated metal sheet is lowered is that the elastic modulus and yield stress or 0.2% proof stress of the metal sheet are lowered by the heating, and the elastic deformation and plasticity. It is easy to deform. Therefore, if the rigidity of the metal plate can be increased by some method, the handling property of the metal plate can be improved.
(B) As a method of increasing the rigidity, a predetermined shape that does not hinder subsequent processing is imparted to the metal plate, and the secondary moment and section modulus of the metal plate to be transported temporarily by the provision of the shape are determined. The method of increasing is easy and inexpensive.

（Ｃ）所定の形状を付与する方法としては、当該所定の形状を金属板材との接触部位に有する支持部材で支持した状態で金属板材を加熱し、当該支持部材の有する形状を金属板材に転写して付与する方法が容易かつ低廉であること。
（Ｄ）支持部材の有する所定の形状としては、支持する金属板材に対し上に凸若しくは下に凸となる凸状曲面、具体的には、円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかの凸状曲面が、金属板材の断面２次モーメントおよび断面係数の増加に効果を発揮すること。また、前記した上に凸となる凸状曲面および下に凸となる凸状曲面の双方を含む波状曲面も、金属板材の断面２次モーメントおよび断面係数の増加に効果を発揮すること。 (C) As a method of providing a predetermined shape, the metal plate material is heated in a state where the predetermined shape is supported by a support member having a contact portion with the metal plate material, and the shape of the support member is transferred to the metal plate material. The method of granting is easy and inexpensive.
(D) The predetermined shape of the supporting member is a convex curved surface that is convex upward or downward with respect to the supporting metal plate, specifically, an arc surface, a paraboloid, an arc surface and a paraboloid surface. The convex curved surface of any one of the combination surface and the combination surface of these with a flat surface is effective in increasing the sectional moment of inertia and section modulus of the metal sheet. Further, the wavy curved surface including both the convex curved surface that is convex upward and the convex curved surface that is convex downward is also effective in increasing the cross-sectional second moment and the section modulus of the metal plate material.

（Ｅ）したがって、これらの凸状曲面または波状曲面を金属板材との接触部位に有する支持部材で支持した状態で金属板材を加熱すれば、前記支持部材の曲面によって定まる所定の曲率の曲面が金属板材に付与され、当該曲面の付与によって金属板材の断面２次モーメントおよび断面係数が増加し、場合によっては支持部材を取り除いても金属板材は付与された形状を保持して自立することも可能となり、金属板材のハンドリング性が著しく改善されること。 (E) Therefore, if the metal plate is heated in a state where the convex curved surface or the wavy curved surface is supported by a support member having a contact portion with the metal plate, the curved surface having a predetermined curvature determined by the curved surface of the support member is a metal. By applying the curved surface, the second moment of section and section modulus of the metal plate are increased, and even if the support member is removed, the metal plate can maintain its applied shape and can stand by itself. The handling performance of the metal plate material is remarkably improved.

（Ｆ）すなわち、上記方法によって断面２次モーメントおよび断面係数を増加させた金属板材は、付与された曲面を構成する稜線と直交する方向から搬送装置が備えるフォークを挿入して支持搬送することによって、安定かつ容易に金属板材を搬送することができること。また、この場合には、金属板材と搬送装置との接触面積はフォークによる支持面積のみとなり、しかも当該接触部位は金属板材の板端部であるので、搬送装置との接触抜熱による温度低下や温度むらの発生を極めて容易に抑制することができること。 (F) That is, the metal plate material whose section moment of inertia and section modulus are increased by the above method is inserted and supported by a fork provided in the transport device from a direction perpendicular to the ridgeline constituting the given curved surface. The metal plate material can be transported stably and easily. Further, in this case, the contact area between the metal plate material and the conveying device is only the support area by the fork, and the contact portion is the plate end portion of the metal plate material. The occurrence of uneven temperature can be suppressed very easily.

（Ｇ）あるいは、上記方法によって断面２次モーメントおよび断面係数を増加させた金属板材は、付与された曲面に、例えばウォーキングビーム搬送装置やベルト搬送装置等が備える支持部材の凸状曲面または波状曲面を嵌合させて支持搬送することによっても、安定かつ容易に金属板材を搬送することができること。また、この場合には、これらの搬送装置が備える加熱装置により前記支持部材、すなわち金属板材との嵌合部を加熱することにより、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制することができること。 (G) Alternatively, the metal plate material whose cross-sectional secondary moment and section modulus are increased by the above method is provided with a convex curved surface or a wavy curved surface of a support member provided on a given curved surface, for example, a walking beam conveying device or a belt conveying device. The metal plate material can be transported stably and easily also by fitting and supporting. Further, in this case, the supporting device, that is, the fitting portion with the metal plate material is heated by the heating device provided in these conveying devices, thereby causing a temperature drop or uneven temperature due to contact heat removal with the conveying device. It can be suppressed.

（Ｈ）そして、上記搬送技術は所定の加熱装置で金属板材を高温かつ均一に加熱して、金型まで搬送する熱間プレス成形における搬送技術にも十分応用することができること。これにより、ハンドリング性の向上効果により金型への位置決め精度が大幅に向上するとともに、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制できるので、プレス製品間の強度ばらつきが少なく品質が安定しているプレス製品を安定して製造することができること。 (H) And the said conveyance technique can fully be applied also to the conveyance technique in the hot press molding which heats a metal plate material with high temperature uniformly with a predetermined heating apparatus, and conveys it to a metal mold | die. As a result, the accuracy of positioning to the mold is greatly improved due to the improvement in handling properties, and the temperature drop and uneven temperature due to contact heat removal with the transfer device can be suppressed, so there is little variation in strength between pressed products. Stable production of press products with stable quality.

上記の知見に基づき、本発明者は、加熱された金属板材を安定かつ容易に搬送することができる加熱された金属板材の搬送技術およびこれに適した金属板材の加熱技術、ならびに当該搬送技術を応用した熱間プレス成形技術に想到した。その要旨とするところは以下の通りである。   Based on the above knowledge, the present inventor has developed a heated metal plate material transport technology that can stably and easily transport a heated metal plate material, a metal plate material heating technology suitable for this, and the transport technology. I came up with the applied hot press forming technology. The gist is as follows.

（１）加熱される金属板材を下側から支持する金属板材の支持部材において、金属板材との接触部位が、支持する金属板材に対し上に凸若しくは下に凸となる凸状曲面またはこれらの双方を含む波状曲面を有することを特徴とする加熱される金属板材の支持部材。
（２）前記凸状曲面または波状曲面が、円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかであることを特徴とする前記（１）に記載の加熱される金属板材の支持部材。 (1) In the support member of the metal plate material that supports the heated metal plate material from the lower side, the contact surface with the metal plate material is a convex curved surface that protrudes upward or downward with respect to the metal plate material to be supported, or these A support member for a metal sheet to be heated, characterized by having a wavy curved surface including both.
(2) The convex curved surface or the wavy curved surface is any one of an arc surface, a parabolic surface, a combined surface of an arc surface and a parabolic surface, or a combined surface of these and a plane. The support member of the metal plate material to be heated as described in 1).

（３）加熱された金属板材を下側から支持する支持部材を備える加熱された金属板材の搬送装置において、前記支持部材が、支持する金属板材に対し上に凸若しくは下に凸となる凸状曲面またはこれらの双方を含む波状曲面を有することを特徴とする加熱された金属板材の搬送装置。
（４）前記支持部材が、アームに設けられたハンド部、加熱された金属板材を交互に載せ替えながらウォーキングビーム搬送する固定スキッドビームと移動スキッドビーム、または複数の回転自在なローラに当接して回動する無端状ベルトのいずれかであることを特徴とする前記（３）に記載の加熱された金属板材の搬送装置。 (3) In the heated metal plate material conveying apparatus including a support member that supports the heated metal plate material from the lower side, the support member has a convex shape that is convex upward or downward with respect to the metal plate material to be supported. A device for transporting a heated metal plate, characterized by having a curved surface or a wavy curved surface including both of them.
(4) The support member is in contact with a hand portion provided on the arm, a fixed skid beam and a moving skid beam that conveys a walking beam while alternately placing heated metal plates, or a plurality of rotatable rollers. The apparatus for conveying a heated metal sheet according to (3), wherein the conveying apparatus is a rotating endless belt.

（５）前記凸状曲面または波状曲面が、円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかであることを特徴とする前記（３）または（４）に記載の加熱された金属板材の搬送装置。
（６）前記支持部材を加熱する加熱装置を備えることを特徴とする前記（３）〜（５）のいずれか１項に記載の加熱された金属板材の搬送装置。 (5) The convex curved surface or the wavy curved surface is any one of an arc surface, a paraboloid, a combination surface of an arc surface and a paraboloid, or a combination surface of these and a plane. The apparatus for transporting a heated metal sheet according to 3) or (4).
(6) The transport apparatus for a heated metal plate material according to any one of (3) to (5), further including a heating device that heats the support member.

（７）支持部材に金属板材を搭載して金属板材を加熱する方法において、前記（１）または（２）に記載の支持部材で支持した状態で金属板材を加熱して、前記支持部材の曲面によって定まる所定の曲率の曲面を金属板材に付与し、当該曲面の付与により金属板材の断面２次モーメントおよび断面係数を増加させることを特徴とする金属板材の加熱方法。 (7) In the method of mounting a metal plate material on a support member and heating the metal plate material, the metal plate material is heated in a state of being supported by the support member according to (1) or (2), and the curved surface of the support member A method of heating a metal plate material, characterized in that a curved surface having a predetermined curvature determined by the equation (1) is applied to the metal plate material, and by applying the curved surface, the secondary moment of section and the section modulus of the metal plate material are increased.

（８）加熱された金属板材を搬送する方法において、金属板材を加熱する際に所定の形状を付与し、当該形状の付与により金属板材の断面２次モーメントおよび断面係数を増加させて搬送することを特徴とする加熱された金属板材の搬送方法。
（９）前記（１）または（２）に記載の支持部材で支持した状態で金属板材を加熱して、前記支持部材の曲面によって定まる所定の曲率の曲面を金属板材に付与し、付与された曲面を構成する稜線と直交する方向から搬送装置が備えるフォークを挿入して金属板材を支持搬送することを特徴とする前記（８）に記載の加熱された金属板材の搬送方法。
（１０）前記（１）または（２）に記載の支持部材で支持した状態で金属板材を加熱して、前記支持部材の曲面によって定まる所定の曲率の曲面を金属板材に付与し、付与された曲面に前記（３）〜（６）のいずれか１項に記載の搬送装置が備える支持部材の凸状曲面または波状曲面を嵌合させて金属板材を支持搬送することを特徴とする前記（８）に記載の加熱された金属板材の搬送方法。 (8) In the method of transporting a heated metal plate material, a predetermined shape is imparted when the metal plate material is heated, and the second moment and the section modulus of the metal plate material are increased by the provision of the shape, and the metal plate material is transported. A method for transporting a heated metal sheet.
(9) The metal plate material is heated in a state of being supported by the support member according to (1) or (2), and a curved surface having a predetermined curvature determined by the curved surface of the support member is applied to the metal plate material. The method for transporting a heated metal plate material according to (8), wherein the metal plate material is supported and transported by inserting a fork provided in the transport device from a direction orthogonal to the ridge line constituting the curved surface.
(10) The metal plate material is heated in a state of being supported by the support member according to (1) or (2), and a curved surface having a predetermined curvature determined by the curved surface of the support member is applied to the metal plate material. (8) The metal plate material is supported and conveyed by fitting a convex curved surface or a wavy curved surface of a support member included in the conveyance device according to any one of (3) to (6) to a curved surface. The method for transporting a heated metal plate material as described in 1).

（１１）被成形材たる金属板材を加熱し、加熱された金属板材を金型まで搬送し、搬送された金属板材をプレス成形する熱間プレス成形方法において、前記（８）〜（１０）のいずれか１項に記載の搬送方法によって搬送された金属板材をプレス成形することを特徴とする熱間プレス成形方法。 (11) In the hot press molding method of heating the metal plate material as the molding material, transporting the heated metal plate material to the mold, and press-molding the transported metal plate material, the above (8) to (10) A hot press forming method, wherein the metal plate material transported by the transport method according to any one of claims 1 to 6 is press molded.

（１）本発明に係る搬送方法によれば、加熱された金属板材を安定かつ容易に搬送することができる。具体的には、加熱された金属板材は弾性係数および降伏応力、または０．２％耐力等が低下しているので変形し易く、これを搬送することが非常に困難であるところ、本発明に係る搬送方法は、金属板材との接触部位に所定の曲面を有する支持部材で支持した状態で金属板材を加熱し、前記支持部材の曲面によって定まる所定の曲率の曲面を容易かつ低廉に金属板材に付与し、当該曲面の付与によって金属板材の断面２次モーメントおよび断面係数を増加させるので、場合によっては支持部材を取り除いても金属板材は付与された形状を一時的に保持して自立することが可能となり、これにより金属板材のハンドリング性が著しく改善し、加熱された金属板材を安定かつ容易に搬送することができる。 (1) According to the transport method of the present invention, the heated metal plate material can be transported stably and easily. Specifically, the heated metal plate material is easily deformed because its elastic modulus and yield stress, or 0.2% proof stress, etc. are reduced, and it is very difficult to transport it. According to such a transport method, the metal plate is heated in a state of being supported by a support member having a predetermined curved surface at a contact portion with the metal plate, and a curved surface having a predetermined curvature determined by the curved surface of the support member is easily and inexpensively applied to the metal plate. Since the second moment and the section modulus of the metal plate material are increased by applying the curved surface, the metal plate material may temporarily hold the applied shape and become independent even if the support member is removed in some cases. This makes it possible to remarkably improve the handleability of the metal plate material, and to convey the heated metal plate material stably and easily.

（２）また、付与された形状が少なくとも一時的に保持される場合、前記付与された曲面を構成する稜線と直交する方向から搬送装置が備えるフォークを挿入して支持搬送する本発明に係る搬送方法によれば、金属板材と搬送装置との接触面積はフォークによる支持面積のみとなり、しかも当該接触部位は金属板材の板端部であるので、従来技術では困難であった搬送装置との接触抜熱による温度低下や温度むらの発生を極めて容易に抑制することができる。 (2) Further, when the applied shape is at least temporarily held, the transport according to the present invention inserts and supports the fork provided in the transport device from the direction orthogonal to the ridgeline constituting the provided curved surface. According to the method, the contact area between the metal plate material and the conveying device is only the support area by the fork, and the contact portion is the plate end of the metal plate material. Generation of temperature drop and temperature unevenness due to heat can be suppressed very easily.

（３）同様に、付与された曲面に、搬送装置が備えるアームの先端に設けられた支持部材であるハンド部の凸状曲面または波状曲面を嵌合させて支持搬送する本発明に係る搬送方法、および、加熱された金属板材を交互に載せ替えながらウォーキングビーム搬送する支持部材である固定スキッドビームと移動スキッドビームが有する凸状曲面または波状曲面を嵌合させて支持搬送する本発明に係る搬送方法、さらには、複数の回転自在なローラに当接して回動する支持部材である無端状ベルトが有する凸状曲面または波状曲面を嵌合させて支持搬送する本発明に係る搬送方法によれば、搬送装置が備える加熱装置によって前記支持部材、すなわち金属板材との嵌合部を加熱することにより、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制することができる。 (3) Similarly, the conveying method according to the present invention is configured to support and convey a convex surface or a wavy curved surface of a hand portion, which is a support member provided at the tip of an arm provided in the conveying device, to a given curved surface. , And transport according to the present invention for supporting and transporting a fixed skid beam, which is a support member for transporting a walking beam, and a convex curved surface or a wavy curved surface of a moving skid beam, while alternately transferring heated metal plates. According to the method, and further, according to the transport method according to the present invention, the convex curved surface or the wavy curved surface of the endless belt that is a support member that rotates in contact with a plurality of rotatable rollers is fitted and supported. By heating the support member, that is, the fitting portion with the metal plate material, by the heating device provided in the transport device, temperature decrease and uneven temperature due to contact heat removal with the transport device It is possible to suppress the raw.

（４）また、金属板材との接触部位に所定の曲面を有する支持部材で支持した状態で金属板材を加熱する本発明に係る金属板材の加熱方法によれば、前記支持部材の曲面によって定まる所定の曲率の曲面を容易かつ低廉に金属板材に付与することができ、これにより金属板材の断面２次モーメントおよび断面係数が増加して、加熱された金属板材を安定かつ容易に搬送することができる。 (4) According to the method for heating a metal plate material according to the present invention in which the metal plate material is heated in a state of being supported by a support member having a predetermined curved surface at a contact portion with the metal plate material, the predetermined value determined by the curved surface of the support member It is possible to easily and inexpensively impart a curved surface of curvature to the metal plate material, thereby increasing the cross-sectional secondary moment and section modulus of the metal plate material, so that the heated metal plate material can be conveyed stably and easily. .

（５）さらには、上記搬送技術を応用した本発明に係る熱間プレス成形方法によれば、ハンドリング性の向上効果により金型への位置決め精度が大幅に向上するとともに、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制できるので、プレス成形の本来的特質であるプレス製品間の強度ばらつきが少なく品質が安定しているプレス製品を安定して製造することができる。 (5) Furthermore, according to the hot press molding method according to the present invention to which the above-mentioned transport technology is applied, the positioning accuracy to the mold is greatly improved by the effect of improving the handling property, and the contact with the transport device is removed. Since it is possible to suppress the occurrence of temperature drop and temperature unevenness due to heat, it is possible to stably produce a press product having a stable quality with little variation in strength between press products, which is an inherent characteristic of press molding.

以下、図２〜図７を参照して、本発明を実施するための最良の形態を説明する。
本発明に係る金属板材の加熱方法、搬送方法およびこれを応用した熱間プレス成形方法で用いる金属板材１としては、Ａｌめっき鋼板、Ｚｎめっき鋼板、高強度鋼板、普通鋼等のいずれの鋼板にも適用することができる。また、鋼板のみならず、Ａｌ板や銅板等の非鉄金属にも適用することができる。なお、当該搬送方法を鋼板の熱間プレス成形における搬送方法に応用する場合には、マルテンサイト変態またはベイナイト変態をする鋼板であれば、金型との接触抜熱による焼入れによりプレス製品の高強度化を図ることができるので、マルテンサイト変態またはベイナイト変態をする鋼板が望ましい。このとき、金型との接触抜熱時に必ずしも変態する必要はなく、成形後に変態してもかまわない。 Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
The metal plate material 1 used in the heating method, the conveying method and the hot press forming method to which the metal plate material according to the present invention is applied may be any steel plate such as an Al-plated steel plate, a Zn-plated steel plate, a high-strength steel plate, or ordinary steel. Can also be applied. Moreover, it can be applied not only to steel plates but also to non-ferrous metals such as Al plates and copper plates. In addition, when applying the said conveyance method to the conveyance method in hot press forming of a steel plate, if it is a steel plate which carries out a martensitic transformation or a bainite transformation, the high intensity | strength of press products will be by quenching by contact heat removal with a metal mold | die. Therefore, a steel sheet that undergoes martensitic transformation or bainite transformation is desirable. At this time, it is not always necessary to transform at the time of heat removal from the mold, and it may be transformed after molding.

支持部材３に搭載した金属板材１を加熱する手段としては特に限定されるものではなく、電気炉、ガス炉での加熱や火炎加熱、通電加熱、高周波加熱、誘導加熱等のいずれの方法でもよい。   The means for heating the metal plate 1 mounted on the support member 3 is not particularly limited, and any method such as heating in an electric furnace or gas furnace, flame heating, current heating, high-frequency heating, induction heating or the like may be used. .

加熱手段を用いて金属板材１を加熱する際には、図２（ａ）〜（ｃ）に示す支持部材３を用いることが望ましい。当該支持部材３は、加熱される金属板材１を下側から支持する支持部材であって、金属板材１との接触部位が、支持する金属板材１に対し上に凸若しくは下に凸となる凸状曲面またはこれらの双方を含む波状曲面を有している。図２（ａ）が上に凸となる凸状曲面、図２（ｂ）が下に凸となる凸状曲面、図２（ｃ）がこれらの双方を含む波状曲面を有する支持部材３を示した模式図である。当該凸状曲面または波状曲面により、支持部材３に搭載して金属板材１を加熱した場合、当該支持部材３の曲面によって定まる所定の曲率の曲面を容易かつ低廉に金属板材１に付与することができ、当該曲面の付与によって金属板材１の断面２次モーメントおよび断面係数を容易かつ低廉に増加させることができ、これにより金属板材１のハンドリング性が著しく改善される。なお、前記したように図２（ａ）〜（ｃ）は本発明に係る金属板材の支持部材の一例を示す模式図であるが、当該支持部材３は、後述する加熱された金属板材１を下側から支持する支持部材であるハンド部６を備える本発明に係る搬送装置のハンド部６としても用いることができる。   When heating the metal plate 1 using the heating means, it is desirable to use the support member 3 shown in FIGS. The support member 3 is a support member that supports the metal sheet 1 to be heated from the lower side, and a contact portion with the metal sheet 1 is convex upward or convex downward with respect to the metal sheet 1 to be supported. Or a wavy curved surface including both of them. FIG. 2A shows a convex curved surface that protrudes upward, FIG. 2B shows a convex curved surface that protrudes downward, and FIG. 2C shows a support member 3 having a wavy curved surface including both of them. It is a schematic diagram. When the metal plate 1 is mounted on the support member 3 and heated by the convex curved surface or the wavy curved surface, a curved surface having a predetermined curvature determined by the curved surface of the support member 3 can be easily and inexpensively applied to the metal plate 1. In addition, the provision of the curved surface can easily and inexpensively increase the cross-sectional secondary moment and the section modulus of the metal plate 1, thereby significantly improving the handleability of the metal plate 1. 2A to 2C are schematic views showing an example of the support member for the metal plate according to the present invention, as described above, the support member 3 has a heated metal plate 1 to be described later. It can also be used as the hand unit 6 of the transport device according to the present invention including the hand unit 6 that is a support member supported from below.

凸状曲面またはこれを含む波状曲面の形状としては、金属板材１の断面２次モーメントおよび断面係数の増加に効果を発揮する円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかであることが望ましい。なお、平面形状であっても断面２次モーメントおよび断面係数の増加に効果を発揮するが、金属板材の性状、特に熱間プレスの場合にはプレス成形性に影響を与えるので、板の短辺の０．１〜１００倍、さらに好ましくは０．５〜５０倍の曲率半径を有する円弧面等の曲面形状が望ましい。換言すると、支持部材３の有する曲面形状がこれらの曲率半径を有する曲面形状ならば、被成形材たる金属板材１に対しその後の加工の支障とならない曲面形状を付与することができる。   As the shape of the convex curved surface or the wavy curved surface including this, an arc surface, a paraboloid, a combined surface of the arc surface and the paraboloid that exerts an effect on an increase in the section moment of inertia and the section modulus of the metal plate 1, Or it is desirable that it is either the combination surface of these and a plane. Even if it is a flat shape, it is effective in increasing the secondary moment of section and section modulus, but it affects the properties of the metal plate, especially in the case of hot pressing, so the short side of the plate A curved surface shape such as a circular arc surface having a radius of curvature of 0.1 to 100 times, more preferably 0.5 to 50 times that of the curved surface is desirable. In other words, if the curved surface shape of the support member 3 is a curved surface shape having these radii of curvature, a curved surface shape that does not hinder subsequent processing can be imparted to the metal plate 1 that is a material to be molded.

図２（ｂ）、（ｃ）に示す下に凸となる凸状曲面またはこれを含む波状曲面であれば、加熱すべき金属板材１を安定して支持部材３に搭載することができ、また、加熱中に支持部材３から金属板材１が脱落するおそれも少ない。
ただし、金属板材１のハンドリング性の観点および熱間プレス成形等に応用する場合には、図２（ａ）に示すような金属板材１に対して上に凸となる凸状曲面を用いるのが最も望ましい。このような支持部材３で金属板材１を加熱し、当該支持部材３の曲面によって定まる所定の曲率の曲面を金属板材１に付与した場合、支持部材３を取り除いても金属板材１は断面２次モーメントおよび断面係数の増加により、付与された形状を保持して自立することが可能となる場合がある。このとき、図３に示すように付与された曲面を構成する稜線と直交する方向から搬送装置が備えるフォーク５を挿入することにより、容易に金属板材１を支持搬送することができる。さらに、この場合には金属板材１と搬送装置との接触面積はフォーク５による支持面積のみとなり、しかも当該接触部位は金属板材１の板端部であるので、搬送装置との接触抜熱による温度低下や温度むらの発生を極めて容易に抑制することができる。 2 (b) and 2 (c), it is possible to stably mount the metal plate 1 to be heated on the support member 3 if it is a convex curved surface or a wavy curved surface including this. Further, there is little possibility that the metal plate 1 is dropped from the support member 3 during the heating.
However, in the case of application to the handling property of the metal plate 1 and hot press molding, it is preferable to use a convex curved surface that is convex upward with respect to the metal plate 1 as shown in FIG. Most desirable. When the metal plate 1 is heated by such a support member 3 and a curved surface having a predetermined curvature determined by the curved surface of the support member 3 is applied to the metal plate 1, the metal plate 1 is secondary in cross section even if the support member 3 is removed. By increasing the moment and section modulus, it may be possible to hold the applied shape and become independent. At this time, as shown in FIG. 3, the metal plate 1 can be easily supported and conveyed by inserting the fork 5 provided in the conveying device from the direction orthogonal to the ridge line constituting the given curved surface. Further, in this case, the contact area between the metal plate 1 and the conveying device is only the area supported by the fork 5, and the contact portion is the plate end of the metal plate 1, so that the temperature due to contact heat removal with the conveying device. The occurrence of the decrease and the temperature unevenness can be suppressed very easily.

支持部材３の材質としては特に限定されるものではなく、耐熱鋼、ステンレス鋼、セラミック等を用いることができる。
なお、支持部材３は、金属板材１を下側から支持する支持部材であれば、加熱炉等の加熱装置の中に設置されてそれ自体は移動しないものと、それ自体が移動するものの両者を含む。後者の例としては、フォークリフトのハンド部や加熱炉等の加熱装置の中に設置されるウォーキングビーム搬送装置のビーム等が該当する。 The material of the support member 3 is not particularly limited, and heat resistant steel, stainless steel, ceramic, or the like can be used.
In addition, as long as the supporting member 3 is a supporting member that supports the metal plate 1 from the lower side, the supporting member 3 is installed in a heating device such as a heating furnace and does not move itself, and the moving member itself moves. Including. Examples of the latter include a beam of a walking beam transfer device installed in a heating device such as a hand unit of a forklift or a heating furnace.

曲面付与により断面２次モーメントおよび断面係数を増加させた金属板材１は、図３に示すように付与された曲面を構成する稜線と直交する方向から搬送装置が備えるフォーク５を挿入して支持搬送することが望ましい。前記したように曲面付与によって断面２次モーメントおよび断面係数を増加させた金属板材１は、支持部材３を取り除いても付与された形状を保持して自立することが可能となる場合があり、この場合には板端部の下側にフォーク５を挿入して支持することにより安定かつ容易に金属板材１を支持搬送することができる。また、金属板材１と搬送装置との接触面積はフォーク５による支持面積のみとなり、しかも当該接触部位は金属板材１の板端部であるので、搬送装置との接触抜熱による温度低下や温度むらの発生を極めて容易に抑制することができる。
なお、曲面付与のために加熱の際に支持部材３に添う形に上から何らかの治具で挟んで軽くプレス成形するようにしてもよい。また、フォーク５の断面形状としては、金属板材１との接触部位が平坦な角形に限定されるものではなく、丸形であっても構わない。 The metal plate material 1 whose sectional moment of inertia and section modulus are increased by applying a curved surface is supported and transported by inserting a fork 5 provided in the conveying device from a direction perpendicular to the ridgeline constituting the curved surface provided as shown in FIG. It is desirable to do. As described above, the metal plate 1 having the increased moment of section and section modulus by applying a curved surface may be able to stand by itself while retaining the applied shape even if the support member 3 is removed. In this case, the metal plate 1 can be supported and transported stably and easily by inserting and supporting the fork 5 below the plate end. Further, the contact area between the metal plate 1 and the transport device is only the support area by the fork 5, and the contact portion is the plate end portion of the metal plate 1 so that the temperature drop or temperature unevenness due to contact heat removal with the transport device. Can be very easily suppressed.
In order to provide a curved surface, it may be lightly press-molded by sandwiching it with a jig from above in a shape that follows the support member 3 during heating. Further, the cross-sectional shape of the fork 5 is not limited to a flat rectangular shape in contact with the metal plate 1, and may be round.

図４は、支持する金属板材１に対し上に凸となる凸状曲面７を有するハンド部６を備える加熱された金属板材の搬送装置を示す模式図であり、曲面付与により断面２次モーメントおよび断面係数を増加させた金属板材１は、付与された曲面に搬送装置が備えるアーム４の先端に設けられたハンド部６の凸状曲面７を嵌合させて支持搬送することによっても安定かつ容易に金属板材１を搬送することができる。この方法は、支持部材を取り除いたときに自立するには至らない断面２次モーメントおよび断面係数を与えた金属板材１の搬送に用いることができる。なお、搬送装置が備えるアーム４に設けられた支持部材であるハンド部６の曲面形状としては、前記した支持する金属板材１に対し上に凸となる凸状曲面に限定されるものではなく、図７に示すように支持する金属板材に対し下に凸となる凸状曲面やこれらの双方を含む波状曲面を用いることができる。
また、ハンド部６の凸状曲面７または波状曲面に電熱ヒータ、ガスバーナ、誘導コイル等の加熱手段を搭載して嵌合部を加熱することにより、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制することができる。なお、ハンド部６の材質としては特に限定されるものではなく、耐熱鋼、ステンレス鋼、セラミック等を用いることができる。 FIG. 4 is a schematic view showing a heated metal plate material conveying device including a hand portion 6 having a convex curved surface 7 that is convex upward with respect to the supporting metal plate material 1. The metal plate 1 with an increased section modulus can be stably and easily also supported and conveyed by fitting the convex curved surface 7 of the hand portion 6 provided at the tip of the arm 4 provided in the conveying device to the provided curved surface. The metal plate 1 can be conveyed. This method can be used for transporting the metal plate material 1 having a second moment of section and a section modulus that do not lead to self-support when the support member is removed. The curved surface shape of the hand portion 6 that is a support member provided on the arm 4 provided in the transport device is not limited to the convex curved surface that is convex upward with respect to the metal plate 1 to be supported, As shown in FIG. 7, a convex curved surface that protrudes downward with respect to the metal plate material to be supported, or a wavy curved surface including both of them can be used.
Further, by mounting heating means such as an electric heater, a gas burner, an induction coil, etc. on the convex curved surface 7 or the wavy curved surface of the hand unit 6 to heat the fitting portion, a temperature drop or temperature due to contact heat removal with the conveying device is achieved. The occurrence of unevenness can be suppressed. In addition, it does not specifically limit as a material of the hand part 6, Heat resistant steel, stainless steel, a ceramic, etc. can be used.

図５は、加熱された金属板材１を固定スキッドビームと移動スキッドビームに交互に載せ替えながらウォーキングビーム搬送するウォーキングビーム搬送装置８を示す模式図であり、金属板材１を下側から支持する支持部材である固定スキッドビームと移動スキッドビームは、支持する金属板材１に対し上に凸となる凸状曲面７を備えている。したがって、曲面付与により断面２次モーメントおよび断面係数を増加させた金属板材１は、付与された曲面に加熱された金属板材の搬送装置であるウォーキングビーム搬送装置８が備える凸状曲面７を嵌合させてウォーキングビーム搬送することによっても、安定かつ容易に金属板材１を搬送することができる。なお、支持部材である固定スキッドビームと移動スキッドビームが備える曲面形状としては、前記した支持する金属板材１に対し上に凸となる凸状曲面に限定されるものではなく、図示しないが支持する金属板材に対し下に凸となる凸状曲面やこれらの双方を含む波状曲面を用いることができる。また、固定スキッドビームと移動スキッドビームの材質としては特に限定されるものではなく、耐熱鋼、ステンレス鋼、セラミック等を用いることができる。   FIG. 5 is a schematic diagram showing a walking beam transport device 8 that transports a walking beam while alternately placing a heated metal plate 1 on a fixed skid beam and a moving skid beam, and supports the metal plate 1 from below. The fixed skid beam and the moving skid beam which are members are provided with a convex curved surface 7 which is convex upward with respect to the metal plate 1 to be supported. Therefore, the metal plate 1 whose sectional moment of inertia and section modulus are increased by applying the curved surface is fitted with the convex curved surface 7 provided in the walking beam transfer device 8 which is a transfer device of the heated metal plate to the applied curved surface. Also, the metal plate 1 can be transported stably and easily by transporting the walking beam. In addition, the curved surface shape provided to the fixed skid beam and the moving skid beam which are the support members is not limited to the convex curved surface which is convex upward with respect to the above-described metal plate material 1 to be supported. A convex curved surface that protrudes downward with respect to the metal plate material or a wavy curved surface including both of them can be used. Further, the material of the fixed skid beam and the moving skid beam is not particularly limited, and heat resistant steel, stainless steel, ceramic, or the like can be used.

また、図６は、加熱された金属板材１をベルト搬送するベルト搬送装置９を示す模式図であり、当該ベルト搬送装置９は、金属板材１を搭載して回動する無端状ベルトと、当該無端状ベルトに当接してこれを張架する複数の回転自在なローラを備えるとともに、加熱された金属板材を下側から支持する支持部材である無端状ベルトは、支持する金属板材１に対し上に凸となる凸状曲面７を備えている。したがって、曲面付与により断面２次モーメントおよび断面係数を増加させた金属板材１は、付与された曲面に加熱された金属板材の搬送装置であるベルト搬送装置９が備える凸状曲面７を嵌合させてベルト搬送することによっても、安定かつ容易に金属板材１を搬送することができる。なお、支持部材である無端状ベルトが備える曲面形状としては、前記した支持する金属板材１に対し上に凸となる凸状曲面に限定されるものではなく、図示しないが支持する金属板材に対し下に凸となる凸状曲面やこれらの双方を含む波状曲面を用いることができる。また、加熱された金属板材の搬送装置であるウォーキングビーム搬送装置８またはベルト搬送装置９が備える凸状曲面７または波状曲面に電熱ヒータ、ガスバーナ、誘導コイル等の加熱手段を搭載して嵌合部を加熱することにより、ウォーキングビーム搬送装置８またはベルト搬送装置９との接触抜熱による温度低下や温度むらの発生を抑制することができる。   FIG. 6 is a schematic diagram showing a belt conveying device 9 that conveys the heated metal plate 1 by a belt. The belt conveying device 9 includes an endless belt that rotates with the metal plate 1 mounted thereon, The endless belt, which is a support member that supports the heated metal plate material from below, includes a plurality of rotatable rollers that abut against and stretch the endless belt. A convex curved surface 7 is provided. Therefore, the metal plate material 1 whose sectional moment of inertia and section modulus are increased by applying the curved surface is fitted with the convex curved surface 7 included in the belt conveying device 9 that is a conveying device for the heated metal plate material. Thus, the metal plate 1 can be transported stably and easily by transporting the belt. In addition, as a curved surface shape with which the endless belt which is a support member is equipped, it is not limited to the convex curved surface which becomes convex upwards with respect to the metal plate material 1 mentioned above, It is not illustrated but with respect to the metal plate material to support. A convex curved surface that is convex downward or a wavy curved surface including both of them can be used. Further, a heating unit such as an electric heater, a gas burner, and an induction coil is mounted on the convex curved surface 7 or the wavy curved surface of the walking beam conveying device 8 or the belt conveying device 9 which is a heated metal plate material conveying device. By heating the temperature, it is possible to suppress a decrease in temperature and occurrence of temperature unevenness due to contact heat removal with the walking beam conveyance device 8 or the belt conveyance device 9.

前記した加熱された金属板材１を下側から支持する支持部材であるハンド部６を備える搬送装置、加熱された金属板材１を支持部材である固定スキッドビームと移動スキッドビームに交互に載せ替えながらウォーキングビーム搬送するウォーキングビーム搬送装置８、および加熱された金属板材１を搭載して回動する支持部材である無端状ベルトと当該無端状ベルトに当接してこれを張架する複数の回転自在なローラを備えるベルト搬送装置９が備える凸状曲面７または波状曲面としては、加熱される金属板材の支持部材３と同様に、金属板材１の断面２次モーメントおよび断面係数の増加に効果を発揮する円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかであることが望ましい。同様に、板の短辺の０．１〜１００倍、さらに好ましくは０．５〜５０倍の曲率半径を有する円弧面等の曲面形状が望ましい。これらの搬送装置が備える凸状曲面７または波状曲面がこれらの曲率半径を有する曲面形状ならば、被成形材たる金属板材１をその後の加工の支障とならない曲面形状を保持した状態のまま安定して搬送することができる。   A transfer device including a hand portion 6 that is a support member that supports the heated metal plate 1 from the lower side, while the heated metal plate 1 is alternately mounted on a fixed skid beam and a moving skid beam that are support members. A walking beam transport device 8 that transports the walking beam, and an endless belt that is a support member that is rotated by mounting the heated metal plate 1, and a plurality of freely rotatable abuts the endless belt. The convex curved surface 7 or the wavy curved surface included in the belt conveying device 9 including a roller is effective in increasing the cross-sectional secondary moment and the section modulus of the metal plate material 1 in the same manner as the support member 3 of the metal plate material to be heated. It is desirable to be any one of an arc surface, a paraboloid, a combination surface of an arc surface and a paraboloid, or a combination surface of these and a plane. Similarly, a curved surface shape such as an arc surface having a radius of curvature of 0.1 to 100 times, more preferably 0.5 to 50 times the short side of the plate is desirable. If the convex curved surface 7 or the wavy curved surface provided in these conveying devices is a curved surface shape having these radii of curvature, the metal plate 1 that is a material to be molded remains stable while maintaining a curved shape that does not hinder subsequent processing. Can be transported.

支持部材３からウォーキングビーム搬送装置８またはベルト搬送装置９へ金属板材１を移送する際、およびウォーキングビーム搬送装置８またはベルト搬送装置９から金型へ金属板材１を移送する際には、フォーク５を備える搬送装置や凸状曲面７または波状曲面を有するハンド部６を備える搬送装置を用いることが望ましい。これにより、安定かつ容易に金属板材１を移送することができる。   When the metal plate 1 is transferred from the support member 3 to the walking beam transfer device 8 or the belt transfer device 9 and when the metal plate 1 is transferred from the walking beam transfer device 8 or the belt transfer device 9 to the mold, the fork 5 It is desirable to use a transport apparatus provided with a hand apparatus 6 having a convex curved surface 7 or a wavy curved surface. Thereby, the metal plate 1 can be transferred stably and easily.

したがって、被成形材たる金属板材１を加熱し、加熱された金属板材１を金型まで搬送し、搬送された金属板材１をプレス成形する熱間プレス成形方法に上記搬送技術を応用した場合には、ハンドリング性の向上効果により金型への位置決め精度が大幅に向上するとともに、搬送装置との接触抜熱による温度低下や温度むらの発生を抑制できるので、プレス成形の本来的特質であるプレス製品間の強度ばらつきが少なく品質が安定しているプレス製品を安定して製造することができる。   Therefore, when the metal sheet 1 which is a material to be molded is heated, the heated metal sheet 1 is conveyed to a mold, and the above conveying technique is applied to a hot press forming method for press-forming the conveyed metal sheet 1. In addition to greatly improving the positioning accuracy on the mold due to the improvement in handling properties, it is possible to suppress the temperature drop and uneven temperature caused by heat removal from the contact with the transfer device. It is possible to stably produce a pressed product with a stable quality with little variation in strength between products.

また、前記したように加熱したことによって剛性が低下しているハンドリング性の劣悪な金属板材１を安定かつ容易に搬送することができる搬送技術の開発は、金属板材のプレス業界のみならず、金属板材を扱う産業界においても強く望まれているところ、上記搬送技術を熱間圧延工程や溶融めっき工程等に応用することで同様な効果を得ることができる。さらに、鋼板の両端支持や片もち支持のいずれの支持形態であっても同様な効果が得られる。すなわち、本発明に係る搬送方法は、熱間プレスのみならず加熱された金属板材を搬送する必要のある技術分野すべてに適用することが可能であり、産業界に与える影響は極めて甚大である。   In addition, as described above, the development of a conveyance technique capable of stably and easily conveying the metal plate 1 having poor handling property whose rigidity is reduced by heating is not limited to the metal plate press industry, Even in the industry that deals with plate materials, the same effect can be obtained by applying the above conveying technique to a hot rolling process or a hot dipping process. Furthermore, the same effect is acquired even if it is any support form of the both ends support of a steel plate, or a piece-like support. That is, the conveying method according to the present invention can be applied not only to hot pressing but also to all technical fields that need to convey a heated metal sheet, and the influence on the industry is extremely large.

次に本発明の実施例について説明するが、この条件は本発明の実施可能性および顕著な効果を立証するために採用した一条件であり、本発明はこの一条件に限定されるものではない。
表１は、板厚１．２ｍｍ、幅３００ｍｍ、長さ１０００ｍｍの冷延鋼板を大気炉内に設置した所定の支持部材に搭載して１０分間加熱し、９００℃とした加熱鋼板を、フォークリフトを用いて長手方向センター位置で支持したときの加熱鋼板の垂れ下がり量（支持点からの鉛直方向垂れ下がり量の最大値）を示す。なお、フォークの支持ピッチは５００ｍｍである。 Next, although the Example of this invention is described, this condition is one condition employ | adopted in order to prove the feasibility and remarkable effect of this invention, and this invention is not limited to this one condition. .
Table 1 shows that a cold-rolled steel sheet having a thickness of 1.2 mm, a width of 300 mm, and a length of 1000 mm is mounted on a predetermined support member installed in an atmospheric furnace and heated for 10 minutes, and the heated steel sheet at 900 ° C. is It shows the amount of sag of the heated steel sheet when it is supported at the longitudinal center position (the maximum value of the amount of sag in the vertical direction from the support point). The fork support pitch is 500 mm.

Figure 2007175722
Figure 2007175722

まず、冷延鋼板との接触部位に曲面を有さない支持部材に搭載して９００℃に加熱した比較例１については、フォーク支持点からの垂れ下がり量が最大３０ｍｍにも達した。また、加熱中に支持部材と支持部材の間に加熱鋼板が垂下し、フォークの挿入が阻害される現象が生じた。   First, about the comparative example 1 which mounted on the support member which does not have a curved surface in a contact site with a cold-rolled steel plate, and heated to 900 degreeC, the amount of sag from a fork support point reached to 30 mm at the maximum. Moreover, the heating steel plate drooped between the support member during the heating, and the phenomenon that insertion of the fork was inhibited occurred.

一方、支持する加熱鋼板に対し上に凸となる凸状曲面を有する支持部材を用いた本発明例１、反対に下に凸となる凸状曲面を有する支持部材を用いた本発明例２、ならびにこれら曲面の双方を有する波状曲面を有する支持部材を用いた本発明例３においては、加熱鋼板の垂れ下がり量はそれぞれ２ｍｍ、３ｍｍおよび３ｍｍであった。また、比較例１と異なり、加熱中に支持部材と支持部材の間に加熱鋼板が垂下することもなく、加熱鋼板の下側に安定してフォークを挿入することができた。したがって、比較例１と異なり、支持点以外の部位においてはフォークによる接触抜熱が生じることがなく、加熱鋼板に温度むらが生じなかった。なお、本発明例１および２で用いた支持部材の曲率半径は５００ｍｍである。   On the other hand, the present invention example 1 using a support member having a convex curved surface that is convex upward with respect to the heated steel plate to be supported, and the present invention example 2 using a support member having a convex curved surface that is convex downward, In addition, in Invention Example 3 using the support member having a wavy curved surface having both of these curved surfaces, the amount of sag of the heated steel plate was 2 mm, 3 mm, and 3 mm, respectively. Further, unlike Comparative Example 1, the heated steel plate did not hang down between the support member during heating, and the fork could be stably inserted under the heated steel plate. Therefore, unlike Comparative Example 1, contact heat removal by the fork did not occur at portions other than the support point, and temperature unevenness did not occur in the heated steel plate. The curvature radius of the support member used in Invention Examples 1 and 2 is 500 mm.

以上の結果から、本発明によれば、支持部材の曲面によって定まる所定の曲率の曲面を容易かつ低廉に金属板材に付与することができ、さらには当該曲面の付与によって金属板材の断面２次モーメントおよび断面係数を増加できることを確認することができた。すなわち、本発明によれば金属板材のハンドリング性が著しく改善し、加熱された金属板材を安定かつ容易に搬送できることを確認することができた。   From the above results, according to the present invention, a curved surface having a predetermined curvature determined by the curved surface of the support member can be easily and inexpensively applied to the metal plate material, and further, the second moment of the section of the metal plate material can be provided by the provision of the curved surface. It was also confirmed that the section modulus could be increased. That is, according to the present invention, it was confirmed that the handling property of the metal plate material was remarkably improved and the heated metal plate material could be conveyed stably and easily.

加熱によって変形する金属板材を示す模式図であり、（ａ）は加熱前、（ｂ）は加熱後の金属板材を示す模式図である。It is a schematic diagram which shows the metal plate material which deform | transforms by heating, (a) is a schematic diagram which shows the metal plate material after a heating, (b) is the heating. 本発明に係る金属板材の支持部材の一例を示す模式図であり、（ａ）は上に凸となる凸状曲面、（ｂ）は下に凸となる凸状曲面、（ｃ）はこれらの双方を含む波状曲面を有する支持部材を示した模式図である。It is a schematic diagram which shows an example of the supporting member of the metal plate material which concerns on this invention, (a) is the convex curved surface which becomes convex upward, (b) is the convex curved surface which becomes convex downward, (c) is these It is the schematic diagram which showed the supporting member which has a wavy curved surface containing both. 本発明に係る搬送方法の一態様を示す模式図である。It is a schematic diagram which shows the one aspect | mode of the conveying method which concerns on this invention. 本発明に係る搬送方法の一態様を示す模式図である。It is a schematic diagram which shows the one aspect | mode of the conveying method which concerns on this invention. 本発明に係る搬送方法の一態様を示す模式図である。It is a schematic diagram which shows the one aspect | mode of the conveying method which concerns on this invention. 本発明に係る搬送方法の一態様を示す模式図である。It is a schematic diagram which shows the one aspect | mode of the conveying method which concerns on this invention. 本発明に係る搬送方法の一態様を示す模式図である。It is a schematic diagram which shows the one aspect | mode of the conveying method which concerns on this invention.

符号の説明Explanation of symbols

１ 金属板材 ３ 支持部材
４ アーム ５ フォーク
６ ハンド部 ７ 凸状曲面
８ ウォーキングビーム搬送装置 ９ ベルト搬送装置

DESCRIPTION OF SYMBOLS 1 Metal plate material 3 Support member 4 Arm 5 Fork 6 Hand part 7 Convex-curved surface 8 Walking beam conveyance apparatus 9 Belt conveyance apparatus

Claims (11)

加熱される金属板材を下側から支持する金属板材の支持部材において、
金属板材との接触部位が、支持する金属板材に対し上に凸若しくは下に凸となる凸状曲面またはこれらの双方を含む波状曲面を有することを特徴とする加熱される金属板材の支持部材。
In the support member of the metal plate material that supports the heated metal plate material from below,
A support member for a heated metal plate, wherein the contact portion with the metal plate has a convex curved surface that protrudes upward or downward with respect to the metal plate to be supported, or a wavy curved surface including both of them.
前記凸状曲面または波状曲面が、円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかであることを特徴とする請求項１に記載の加熱される金属板材の支持部材。
2. The convex curved surface or the wavy curved surface is any one of an arc surface, a paraboloid, a combined surface of an arc surface and a paraboloid, or a combined surface of these and a plane. The support member of the metal plate material to be heated.
加熱された金属板材を下側から支持する支持部材を備える加熱された金属板材の搬送装置において、
前記支持部材が、支持する金属板材に対し上に凸若しくは下に凸となる凸状曲面またはこれらの双方を含む波状曲面を有することを特徴とする加熱された金属板材の搬送装置。
In the heated metal sheet material conveying device including a support member that supports the heated metal sheet material from below,
The apparatus for transporting a heated metal plate, wherein the support member has a convex curved surface that is convex upward or downward with respect to the metal plate material to be supported, or a wavy curved surface including both of them.
前記支持部材が、アームに設けられたハンド部、加熱された金属板材を交互に載せ替えながらウォーキングビーム搬送する固定スキッドビームと移動スキッドビーム、または複数の回転自在なローラに当接して回動する無端状ベルトのいずれかであることを特徴とする請求項３に記載の加熱された金属板材の搬送装置。
The support member rotates in contact with a fixed skid beam and a moving skid beam, or a plurality of rotatable rollers, which carry a walking beam while alternately placing a hand portion provided on an arm and a heated metal plate. The apparatus for conveying a heated metal sheet according to claim 3, wherein the apparatus is an endless belt.
前記凸状曲面または波状曲面が、円弧面、放物面、円弧面と放物面との組み合わせ面、またはこれらと平面との組み合わせ面のいずれかであることを特徴とする請求項３または４に記載の加熱された金属板材の搬送装置。
5. The convex curved surface or the wavy curved surface is any one of an arc surface, a paraboloid, a combined surface of an arc surface and a paraboloid, or a combined surface of these and a plane. The apparatus for conveying a heated metal plate material according to 1.
前記支持部材を加熱する加熱装置を備えることを特徴とする請求項３〜５のいずれか１項に記載の加熱された金属板材の搬送装置。
The heating device for heating a metal sheet according to any one of claims 3 to 5, further comprising a heating device for heating the support member.
支持部材に金属板材を搭載して金属板材を加熱する方法において、
請求項１または２に記載の支持部材で支持した状態で金属板材を加熱して、前記支持部材の曲面によって定まる所定の曲率の曲面を金属板材に付与し、当該曲面の付与により金属板材の断面２次モーメントおよび断面係数を増加させることを特徴とする金属板材の加熱方法。
In the method of heating the metal plate material by mounting the metal plate material on the support member,
The metal plate material is heated in a state of being supported by the support member according to claim 1 or 2, and a curved surface having a predetermined curvature determined by the curved surface of the support member is applied to the metal plate material, and the cross section of the metal plate material is provided by the provision of the curved surface. A method for heating a metal sheet, wherein the second moment and the section modulus are increased.
加熱された金属板材を搬送する方法において、
金属板材を加熱する際に所定の形状を付与し、当該形状の付与により金属板材の断面２次モーメントおよび断面係数を増加させて搬送することを特徴とする加熱された金属板材の搬送方法。
In a method of conveying a heated metal plate material,
A method for transporting a heated metal sheet, comprising: imparting a predetermined shape when heating the metal sheet, and increasing the cross-sectional second moment and section modulus of the metal sheet by imparting the shape.
請求項１または２に記載の支持部材で支持した状態で金属板材を加熱して、前記支持部材の曲面によって定まる所定の曲率の曲面を金属板材に付与し、付与された曲面を構成する稜線と直交する方向から搬送装置が備えるフォークを挿入して金属板材を支持搬送することを特徴とする請求項８に記載の加熱された金属板材の搬送方法。
A metal plate material is heated in a state of being supported by the support member according to claim 1 or 2, a curved surface having a predetermined curvature determined by a curved surface of the support member is applied to the metal plate material, and a ridge line constituting the applied curved surface; The method for transporting a heated metal plate material according to claim 8, wherein the metal plate material is supported and transported by inserting a fork provided in the transport device from a direction orthogonal to the metal sheet.
請求項１または２に記載の支持部材で支持した状態で金属板材を加熱して、前記支持部材の曲面によって定まる所定の曲率の曲面を金属板材に付与し、付与された曲面に請求項３〜６のいずれか１項に記載の搬送装置が備える支持部材の凸状曲面または波状曲面を嵌合させて金属板材を支持搬送することを特徴とする請求項８に記載の加熱された金属板材の搬送方法。
The metal plate material is heated in a state of being supported by the support member according to claim 1 or 2, and a curved surface having a predetermined curvature determined by the curved surface of the support member is imparted to the metal plate material. 9. The heated metal plate material according to claim 8, wherein the metal plate material is supported and conveyed by fitting a convex curved surface or a wavy curved surface of a support member included in the conveyance device according to claim 6. Transport method.
被成形材たる金属板材を加熱し、加熱された金属板材を金型まで搬送し、搬送された金属板材をプレス成形する熱間プレス成形方法において、
請求項８〜１０のいずれか１項に記載の搬送方法によって搬送された金属板材をプレス成形することを特徴とする熱間プレス成形方法。

In a hot press molding method of heating a metal plate material to be molded, conveying the heated metal plate material to a mold, and press-molding the conveyed metal plate material,
A hot press-molding method, comprising press-molding a metal plate material transported by the transport method according to claim 8.

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