JP2006110549A - Metal plate heating apparatus for hot press - Google Patents

Metal plate heating apparatus for hot press Download PDF

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JP2006110549A
JP2006110549A JP2004297046A JP2004297046A JP2006110549A JP 2006110549 A JP2006110549 A JP 2006110549A JP 2004297046 A JP2004297046 A JP 2004297046A JP 2004297046 A JP2004297046 A JP 2004297046A JP 2006110549 A JP2006110549 A JP 2006110549A
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metal plate
heat transfer
heating
transfer body
heat
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JP4611704B2 (en
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Katsunori Ishiguro
克則 石黒
Masaki Furuhashi
正樹 古橋
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Aisin Takaoka Co Ltd
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Aisin Takaoka Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal plate heating apparatus for hot press capable of heating the metal plate to a high temperature in a relatively short period of time, and preventing oxidation of the surface of the metal surface in the heating mode as much as possible. <P>SOLUTION: The heating apparatus is provided with: lower heat transfer bodies (12, 14) which have heating faces (12a, 14a) to be brought into surface-contact with the lower surface of a metal plate and transfer the heat of heat sources (13, 15) to the metal plate via the heating faces; and an upper heat transfer body (22) which has a heating face (22a) to be brought into surface contact with the upper surface of the metal plate and transfers the heat of a heat source (23) via the heating face. The metal plate is held between the heating faces (12a, 14a) of the lower heat transfer bodies and the heating face (22a) of the upper heat transfer body, and heated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、熱間プレス成形に用いられる金属板をプレス前に加熱するための加熱装置に関する。   The present invention relates to a heating device for heating a metal plate used for hot press forming before pressing.

機械部品等の分野では、数百℃の高温状態に加熱した高張力鋼板を熱間プレスして所望形状の製品を得る熱間プレス成形法が知られている（特許文献１，２参照）。特に特許文献２は、所定の高張力鋼板を電気加熱炉で８５０〜１０５０℃の温度に予め加熱し、その鋼板を成形用プレスに高速搬送して高温状態のままの鋼板を相対的に低温のプレス型でプレスすることにより、付形と焼入れとを同時に行って、成形性や引張強度等に優れた部品（車輌用衝突補強材）を製造する方法を開示する。   In the field of machine parts and the like, a hot press forming method is known in which a high-tensile steel sheet heated to a high temperature of several hundred degrees Celsius is hot-pressed to obtain a product having a desired shape (see Patent Documents 1 and 2). In particular, Patent Document 2 preliminarily heats a predetermined high-strength steel plate to a temperature of 850 to 1050 ° C. in an electric heating furnace, conveys the steel plate to a forming press at a high speed, Disclosed is a method of manufacturing a part (vehicle collision reinforcing material) excellent in formability, tensile strength, etc. by simultaneously performing shaping and quenching by pressing with a press die.

しかしながら、特許文献２では、連続式の電気加熱炉を用いて高張力鋼板を加熱しているため、鋼板の温度を８５０℃以上とするのに少なからぬ時間（例えば３〜５分）を要するのみならず、鋼板が電気加熱炉内に滞在する時間を正確に管理しないと、鋼板の温度が望ましい温度範囲を逸脱するおそれがある。例えば、一時的なトラブルで製造ラインが一時停止しただけで、鋼板が加熱超過状態に陥り使用できなくなるという不便さや不自由さがあった。また、連続式電気加熱炉の場合、その内部を極力不活性ガスで満たすよう配慮しても、加熱炉から鋼板を取り出す際に炉内に不可避的に進入する空気により、まだ炉内で加熱中の他の鋼板の表面が酸化してしまうのを避け難い。本発明はこれらの事情に鑑みてなされたものである。   However, in Patent Document 2, since a high-strength steel sheet is heated using a continuous electric heating furnace, a considerable time (for example, 3 to 5 minutes) is required to set the temperature of the steel sheet to 850 ° C. or higher. If the time for which the steel plate stays in the electric heating furnace is not accurately managed, the temperature of the steel plate may deviate from the desired temperature range. For example, there is an inconvenience and inconvenience that the steel sheet falls into an overheated state and cannot be used just by temporarily stopping the production line due to a temporary trouble. In addition, in the case of a continuous electric heating furnace, even if it is considered to fill the interior with inert gas as much as possible, it is still heated in the furnace by the air that inevitably enters the furnace when removing the steel plate from the heating furnace. It is difficult to avoid oxidation of the surface of other steel plates. The present invention has been made in view of these circumstances.

尚、本件出願前の先行技術調査では特許文献３も発見された。但し、特許文献３は、被加熱物として木材合板等を想定したホットプレスの加熱装置に関するものであり、これは積層された薄板材等を接着剤で貼り合わせる際の加熱押圧を意図した技術である。   In addition, Patent Document 3 was also found in the prior art search prior to this application. However, Patent Document 3 relates to a hot press heating device that assumes a wood plywood or the like as an object to be heated, and this is a technique intended for heating and pressing when laminating laminated thin plates with an adhesive. is there.

特開２００１−３１４９２３号公報（要約）JP 2001-314923 A (summary) 特開２００２−１０２９８０号公報JP 2002-102980 A 特開平１１−１１４９０７号公報Japanese Patent Laid-Open No. 11-114907

本発明の目的は、高張力鋼板等の熱間プレス用金属板を比較的短時間で高温度に加熱することができると共に、加熱時において金属板表面の酸化を極力防止することができる熱間プレス用金属板の加熱装置を提供することにある。   The object of the present invention is to enable hot press metal plates such as high-tensile steel plates to be heated to a high temperature in a relatively short time, and to prevent hot oxidation of the metal plate surface as much as possible during heating. It is providing the heating apparatus of the metal plate for a press.

請求項１の発明は、金属板の一方の面に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する第１の伝熱体と、金属板の他方の面に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する第２の伝熱体とを備え、前記第１伝熱体の加熱面と前記第２伝熱体の加熱面との間に金属板を挟み込んで当該金属板を加熱することを特徴とする熱間プレス用金属板の加熱装置である。   The invention according to claim 1 has a heating surface that can be brought into surface contact with one surface of the metal plate, a first heat transfer body that transfers heat of the heat source to the metal plate via the heating surface, A heating surface capable of being brought into surface contact with the other surface, and a second heat transfer body that transfers heat of the heat source to the metal plate through the heating surface, the heating surface of the first heat transfer body, and A metal plate heating apparatus for hot pressing, wherein a metal plate is sandwiched between a heating surface of a second heat transfer body and the metal plate is heated.

請求項１によれば、本加熱装置による金属板の加熱は、第１及び第２伝熱体間に金属板を挟み込み、その両面を各伝熱体の加熱面に接触させることによる固体間熱伝導によって行われる。このため、対流伝熱や放射伝熱を基調とした従来の加熱装置に比べて、金属板を目標温度に加熱するまでの時間が大幅に短縮される。また、金属板の両面は、各伝熱体の加熱面に面接触することで空気（酸化性ガス）との接触を遮断され、あるいは空気露出面積が最小限にとどめられるため、金属板表面の酸化が極力防止される。   According to the first aspect of the present invention, the heating of the metal plate by the present heating device is performed by sandwiching the metal plate between the first and second heat transfer members and bringing both surfaces into contact with the heating surface of each heat transfer member. Done by conduction. For this reason, compared with the conventional heating apparatus based on convective heat transfer or radiant heat transfer, the time until the metal plate is heated to the target temperature is greatly shortened. In addition, since both surfaces of the metal plate are in contact with the heating surface of each heat transfer body, contact with air (oxidizing gas) is blocked, or the exposed area of the air is kept to a minimum. Oxidation is prevented as much as possible.

請求項２の発明は、金属板をほぼ水平に載置可能な載置面を兼ねた、金属板の下面の一部に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する下側固定伝熱体と、前記下側固定伝熱体に隣接して設けられると共に、金属板の下面の一部に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する下側可動伝熱体と、前記下側固定伝熱体及び下側可動伝熱体の上方においてこれらに接近離間可能に設けられると共に、金属板の上面に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する上側可動伝熱体とを備え、前記下側可動伝熱体は、その加熱面が前記下側固定伝熱体の載置面を兼ねた加熱面に載置された金属板の下面に接触する加熱位置と、当該加熱面が前記加熱位置よりも下方又は側方に位置することになる退避位置との間を移動可能となっていることを特徴とする熱間プレス用金属板の加熱装置である。   The invention of claim 2 has a heating surface that can be brought into surface contact with a part of the lower surface of the metal plate that also serves as a mounting surface on which the metal plate can be mounted substantially horizontally, and the heat source A lower fixed heat transfer body that transfers heat to the metal plate, and a heating surface that is provided adjacent to the lower fixed heat transfer body and that can be brought into surface contact with a part of the lower surface of the metal plate. A lower movable heat transfer body for transferring the heat of the heat source to the metal plate via the surface, and provided above and below the lower fixed heat transfer body and the lower movable heat transfer body so as to be close to and away from the metal plate. And an upper movable heat transfer body that transfers heat from the heat source to the metal plate via the heating surface, and the lower movable heat transfer body has a heating surface that is in contact with the upper surface. A heating position that contacts a lower surface of a metal plate placed on a heating surface that also serves as a placement surface of the lower fixed heat transfer body, and the heating surface is the heating position It is a heating apparatus for hot pressing a metal plate, characterized in that is movable between a retracted position which is to be located in remote downward or laterally.

請求項２によれば、金属板の加熱時には、下側固定伝熱体の載置面を兼ねた加熱面上に金属板をほぼ水平に載置（及び面接触）させると共に、加熱位置に配置された下側可動伝熱体の加熱面を金属板の下面の一部に面接触させた状態で、上側可動伝熱体の加熱面を金属板の上面に面接触させる。このように本加熱装置による金属板の加熱は、下側固定伝熱体及び下側可動伝熱体からなる下側伝熱体群と上側可動伝熱体との間に金属板を挟み込み、その上下両面を各伝熱体の加熱面に接触させることによる固体間熱伝導によって行われる。このため、対流伝熱や放射伝熱を基調とした従来の加熱装置に比べて、金属板を目標温度に加熱するまでの時間が大幅に短縮される。また、金属板の両面は、各伝熱体の加熱面に面接触することで空気（酸化性ガス）との接触を遮断され、あるいは空気露出面積が最小限にとどめられるため、金属板表面の酸化が極力防止される。   According to claim 2, when the metal plate is heated, the metal plate is placed almost horizontally on the heating surface which also serves as the placement surface of the lower fixed heat transfer body (and surface contact), and is arranged at the heating position. The heating surface of the upper movable heat transfer body is brought into surface contact with the upper surface of the metal plate in a state where the heating surface of the lower movable heat transfer body is in surface contact with a part of the lower surface of the metal plate. In this way, the heating of the metal plate by the heating device is performed by sandwiching the metal plate between the lower heat transfer body group composed of the lower fixed heat transfer body and the lower movable heat transfer body and the upper movable heat transfer body. This is performed by heat conduction between solids by bringing the upper and lower surfaces into contact with the heating surface of each heat transfer body. For this reason, compared with the conventional heating apparatus based on convective heat transfer or radiant heat transfer, the time until the metal plate is heated to the target temperature is greatly shortened. In addition, since both surfaces of the metal plate are in contact with the heating surface of each heat transfer body, contact with air (oxidizing gas) is blocked, or the exposed area of the air is kept to a minimum. Oxidation is prevented as much as possible.

更に金属板の非加熱時、即ち金属板を下側固定伝熱体の載置面を兼ねた加熱面上に搬入し又はそこから搬出する際には、上側可動伝熱体を下側固定伝熱体から離間配置することで、上下両伝熱体間に金属板の搬送装置が進入する空間を確保できる。それと同時に下側可動伝熱体を加熱位置から退避位置に切替え配置することで、その下側可動伝熱体の加熱面が面接触し得る金属板下面部分の直下にも、金属板の搬送装置の一部（例えば後述するキャッチハンド４２の類）が下側伝熱体と干渉せずに入り込む空間が生まれる。それ故、請求項２の装置によれば、搬送装置による金属板の把持や搬送が非常に楽になり、金属板を加熱装置に搬入又は搬出する際の位置決め精度が向上するのみならず、高温状態にある金属板を次工程のプレス機に搬送する時間が短縮される。   Furthermore, when the metal plate is not heated, that is, when the metal plate is carried into or out of the heating surface which also serves as a mounting surface for the lower fixed heat transfer body, the upper movable heat transfer body is moved to the lower fixed heat transfer body. By being spaced apart from the heat body, it is possible to secure a space for the metal plate transport device to enter between the upper and lower heat transfer bodies. At the same time, the lower movable heat transfer body is switched from the heating position to the retracted position, so that the metal plate conveying device is also directly below the lower surface of the metal plate where the heating surface of the lower movable heat transfer body can come into surface contact. A space is created in which a part (eg, a catch hand 42 described later) enters without interfering with the lower heat transfer body. Therefore, according to the apparatus of claim 2, gripping and transporting of the metal plate by the transport device is very easy, and not only the positioning accuracy when the metal plate is carried into or out of the heating device is improved, but also in a high temperature state. The time for transporting the metal plate to the press machine in the next process is shortened.

なお、請求項２における「下方」とは、直下方のみならず斜め下方をも含む。   It should be noted that “lower” in claim 2 includes not only directly below but also obliquely below.

請求項３の発明は、請求項１又は２に記載の熱間プレス用金属板の加熱装置において、前記熱源の少なくとも一つは、ブロックヒータであることを特徴とする。   According to a third aspect of the present invention, in the heating apparatus for a hot press metal plate according to the first or second aspect, at least one of the heat sources is a block heater.

請求項３によれば、熱源の小型化又は薄型化が図られ、ひいては加熱装置の小型化を図ることができる。また、ブロックヒータは電気加熱器であるため、金属板の温度管理がし易いという利点がある。   According to the third aspect, the heat source can be downsized or thinned, and as a result, the heating device can be downsized. Moreover, since a block heater is an electric heater, there exists an advantage that the temperature control of a metal plate is easy.

請求項４の発明は、請求項１又は２に記載の熱間プレス用金属板の加熱装置において、前記伝熱体の少なくとも一つは、熱源としてのカートリッジヒータを内蔵したブロックヒータによって構成されることを特徴とする。   According to a fourth aspect of the present invention, in the heating device for a hot-pressing metal plate according to the first or second aspect, at least one of the heat transfer members is constituted by a block heater incorporating a cartridge heater as a heat source. It is characterized by that.

請求項４によれば、熱源としてのカートリッジヒータを内蔵したブロックヒータで伝熱体を構成することにより、加熱装置の更なる小型化を図ることができる。また、ブロックヒータによれば、その加熱面全体に広い均熱エリアを確保でき熱再現性にも優れるため、金属板の温度管理がし易いという利点がある。   According to the fourth aspect of the present invention, the heat transfer body is constituted by the block heater having a built-in cartridge heater as a heat source, whereby the heating device can be further reduced in size. Moreover, according to the block heater, since a wide soaking area can be secured on the entire heating surface and heat reproducibility is excellent, there is an advantage that it is easy to manage the temperature of the metal plate.

請求項１〜４の熱間プレス用金属板の加熱装置によれば、熱間プレス用金属板を比較的短時間で高温度に加熱することができ、且つ加熱時において金属板表面の酸化を極力防止することができる。加えて、請求項２の熱間プレス用金属板の加熱装置によれば、下側可動伝熱体を加熱位置から退避位置に切替え配置可能としたことで、下側可動伝熱体の加熱面が面接触し得る金属板下面部分の直下にも、金属板の搬送装置の一部が下側伝熱体と干渉せずに入り込む空間を生み出すことができるため、搬送装置による金属板の把持や搬送が非常に楽になり、金属板を加熱装置に搬入又は搬出する際の位置決め精度が向上すると共に、高温状態にある金属板を次工程のプレス機に搬送する時間の短縮が容易になる。   According to the apparatus for heating a metal plate for hot pressing according to claims 1 to 4, the metal plate for hot pressing can be heated to a high temperature in a relatively short time, and the surface of the metal plate is oxidized during heating. It can be prevented as much as possible. In addition, according to the heating device for a hot press metal plate of claim 2, the lower movable heat transfer body can be switched from the heating position to the retracted position, whereby the heating surface of the lower movable heat transfer body Since a part of the metal plate transport device can enter without directly interfering with the lower heat transfer body, directly below the lower surface portion of the metal plate that can be in surface contact with the metal plate, The conveyance becomes very easy, the positioning accuracy when the metal plate is carried into or out of the heating device is improved, and the time for conveying the metal plate in a high temperature state to the press machine in the next process is easily shortened.

本発明の一実施形態を図面を参照しつつ説明する。図１に示すように、本実施形態の加熱装置は、工場等の設置面上に固定設置される下側ユニット１０と、その下側ユニット１０の上方において該下側ユニット１０に対し接近離間可能に設けられた上側ユニット２０とから構成されている。   An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the heating device according to the present embodiment is capable of approaching and separating from the lower unit 10 fixedly installed on the installation surface of a factory or the like, and the lower unit 10 above the lower unit 10. It is comprised from the upper unit 20 provided in this.

下側ユニット１０は、上方に開口した下側耐火性枠体１１、下側固定伝熱体１２及びその熱源１３、並びに、その下側固定伝熱体１２の左右両側にそれぞれ隣接する下側可動伝熱体１４、その熱源１５及び垂直駆動機構１６を備えている。   The lower unit 10 includes a lower refractory frame 11 that opens upward, a lower fixed heat transfer body 12 and a heat source 13 thereof, and lower movable parts adjacent to the left and right sides of the lower fixed heat transfer body 12, respectively. A heat transfer body 14, its heat source 15 and a vertical drive mechanism 16 are provided.

下側耐火性枠体１１の底壁部１１ａの中央には架台部１１ｂが設けられており、その架台部１１ｂ上には、下側固定伝熱体１２及びその熱源１３が固定設置されている。下側固定伝熱体１２は、概して平盤状の金属直方体であって、銅、銀、金又はアルミニウム等の高熱伝導性金属（後述するブロックヒータのブロック本体よりも熱伝導率が高い金属）で作られている。下側固定伝熱体１２の上端面１２ａは水平で平滑な面となっている。この上端面１２ａは、被加熱物たる金属板を水平に載置可能な載置面を兼ねた、金属板の下面の一部に面接触可能な加熱面１２ａを提供する。   A gantry 11b is provided at the center of the bottom wall 11a of the lower refractory frame 11, and the lower fixed heat transfer body 12 and its heat source 13 are fixedly installed on the gantry 11b. . The lower fixed heat transfer body 12 is generally a flat plate-shaped metal rectangular parallelepiped, and has a high thermal conductivity metal such as copper, silver, gold, or aluminum (a metal having higher thermal conductivity than the block body of the block heater described later). It is made with. The upper end surface 12a of the lower fixed heat transfer body 12 is a horizontal and smooth surface. The upper end surface 12a provides a heating surface 12a that can be brought into surface contact with a part of the lower surface of the metal plate, which also serves as a mounting surface on which the metal plate as the object to be heated can be horizontally mounted.

架台部１１ｂと下側固定伝熱体１２との間に設けられた熱源１３は、ブロックヒータで構成されている。ブロックヒータとは、ステンレス鋼等の耐熱性金属からなる略直方体形状のブロック本体の内部に、カートリッジヒータ等の電気発熱素子を複数個組み込んで構成したヒータユニットであって、ブロック本体の少なくとも一面（通常は上面）を加熱面又は伝熱面として機能させるものをいう（例えば特開平１１−１４５１６６号参照）。ブロックヒータ１３の上面は下側固定伝熱体１２の下端面に密接しており、下側固定伝熱体１２はブロックヒータが発生する熱を受け、その熱を加熱面１２ａを介して下側固定伝熱体１２上に載置された金属板に伝達する。   The heat source 13 provided between the gantry 11b and the lower fixed heat transfer body 12 is configured by a block heater. A block heater is a heater unit configured by incorporating a plurality of electric heating elements such as cartridge heaters inside a substantially rectangular parallelepiped block body made of a heat-resistant metal such as stainless steel, and at least one surface of the block body ( Usually, the upper surface is used as a heating surface or a heat transfer surface (for example, see JP-A-11-145166). The upper surface of the block heater 13 is in close contact with the lower end surface of the lower fixed heat transfer body 12, and the lower fixed heat transfer body 12 receives the heat generated by the block heater and transfers the heat to the lower side via the heating surface 12a. This is transmitted to the metal plate placed on the fixed heat transfer body 12.

下側耐火性枠体１１内には、中央の架台部１１ｂと左右側壁部１１ｃとの間において、下側可動伝熱体１４を設置し且つその垂直動を許容するための設置スペースが確保されている。左右の各設置スペースには垂直駆動機構１６が設けられ、その垂直駆動機構１６の上部には、下側可動伝熱体１４及びその熱源１５が設けられている。各下側可動伝熱体１４は、前記下側固定伝熱体１２と同様の金属直方体であって、その上端面１４ａは水平で平滑な面となっており、金属板の下面の一部に面接触可能な加熱面１４ａを提供する。また、各熱源１５は、前記熱源１３と同様のブロックヒータで構成されている。   In the lower refractory frame 11, an installation space for installing the lower movable heat transfer body 14 and allowing the vertical movement thereof is secured between the central frame portion 11b and the left and right side wall portions 11c. ing. A vertical drive mechanism 16 is provided in each of the left and right installation spaces, and a lower movable heat transfer body 14 and its heat source 15 are provided above the vertical drive mechanism 16. Each lower movable heat transfer body 14 is a metal rectangular parallelepiped similar to the lower fixed heat transfer body 12, and its upper end surface 14a is a horizontal and smooth surface, and is formed on a part of the lower surface of the metal plate. A heating surface 14a capable of surface contact is provided. Each heat source 15 is composed of the same block heater as the heat source 13.

垂直駆動機構１６は、例えば油圧シリンダで構成されており、下側可動伝熱体１４及びその熱源１５を垂直方向に移動させる。垂直駆動機構１６による下側可動伝熱体１４及びその熱源１５の移動可能範囲は、下側可動伝熱体の加熱面１４ａが下側固定伝熱体の加熱面１２ａと面一なる加熱位置（図１及び図２参照）を上限とし、下側可動伝熱体の加熱面１４ａが前記加熱位置よりも下方に後退した退避位置（図３参照）を下限とする範囲である。下側可動伝熱体１４が加熱位置に配置されると、その加熱面１４ａは、下側固定伝熱体１２上に載置された金属板３０の左右にはみ出した各端部の下面に接触可能となる。   The vertical drive mechanism 16 is composed of, for example, a hydraulic cylinder, and moves the lower movable heat transfer body 14 and its heat source 15 in the vertical direction. The movable range of the lower movable heat transfer body 14 and its heat source 15 by the vertical drive mechanism 16 is such that the heating surface 14a of the lower movable heat transfer body is flush with the heating surface 12a of the lower fixed heat transfer body ( 1 and FIG. 2) as an upper limit, and a retreat position (see FIG. 3) in which the heating surface 14a of the lower movable heat transfer body recedes below the heating position is a lower limit. When the lower movable heat transfer body 14 is disposed at the heating position, the heating surface 14a contacts the lower surface of each end portion that protrudes to the left and right of the metal plate 30 placed on the lower fixed heat transfer body 12. It becomes possible.

尚、上記加熱位置と退避位置との高低差（即ち下側可動伝熱体１４の可動ストローク）は、後述する金属板の搬送装置４０が備えるキャッチハンド４２の大きさや必要な可動スペース等を考慮して適宜定められる。また、図５（Ａ）に示唆するように、下側固定伝熱体の加熱面１２ａの面積は、各下側可動伝熱体の加熱面１４ａの面積よりも大きく設定されている。各下側可動伝熱体の加熱面１４ａの面積や形状は、後述する金属板の搬送装置４０が備えるキャッチハンド４２の大きさ等を考慮して定められる。   The difference in height between the heating position and the retracted position (that is, the movable stroke of the lower movable heat transfer body 14) takes into account the size of the catch hand 42 provided in the metal plate transfer device 40 described later, the necessary movable space, and the like. As appropriate. Further, as suggested in FIG. 5A, the area of the heating surface 12a of the lower fixed heat transfer body is set larger than the area of the heating surface 14a of each lower movable heat transfer body. The area and shape of the heating surface 14a of each lower movable heat transfer body are determined in consideration of the size of the catch hand 42 provided in the metal plate transfer device 40 described later.

他方、図１に示すように、上側ユニット２０は、下方に開口した上側耐火性枠体２１、並びに、上側可動伝熱体２２及びその熱源２３を備えている。   On the other hand, as shown in FIG. 1, the upper unit 20 includes an upper refractory frame 21 that opens downward, an upper movable heat transfer body 22, and a heat source 23 thereof.

上側耐火性枠体２１の天井部２１ａの下面側には、熱源２３が固定され、その熱源２３の下側には上側可動伝熱体２２が固定されている。熱源２３は、前記熱源１３と同様のブロックヒータで構成されている。上側可動伝熱体２２は、前記下側固定伝熱体１２と同様の金属直方体であって、その下端面２２ａは水平で平滑な面となっており、金属板の上面に面接触可能な加熱面２２ａを提供する。上側可動伝熱体２２は、その加熱面２２ａを介して熱源２３の熱を金属板に伝達する。   A heat source 23 is fixed to the lower surface side of the ceiling portion 21 a of the upper fireproof frame 21, and an upper movable heat transfer body 22 is fixed to the lower side of the heat source 23. The heat source 23 is composed of a block heater similar to the heat source 13. The upper movable heat transfer body 22 is a metal rectangular parallelepiped similar to the lower fixed heat transfer body 12, and its lower end surface 22 a is a horizontal and smooth surface, and can be brought into surface contact with the upper surface of the metal plate. A surface 22a is provided. The upper movable heat transfer body 22 transfers the heat of the heat source 23 to the metal plate via the heating surface 22a.

上側可動伝熱体の加熱面２２ａと、前記下側固定伝熱体の加熱面１２ａ及び２つの下側可動伝熱体の加熱面１４ａとは対向関係にあり、上側可動伝熱体加熱面２２ａの面積及び形状は、下側固定伝熱体加熱面１２ａと２つの下側可動伝熱体加熱面１４ａとを合わせた面積及び形状に対応する。上側耐火性枠体２１、上側可動伝熱体２２及びその熱源２３からなる上側ユニット２０は、図示しない垂直駆動機構によって前記下側ユニット１０に対し接近離間可能となっている。   The heating surface 22a of the upper movable heat transfer body, the heating surface 12a of the lower fixed heat transfer body, and the heating surface 14a of the two lower movable heat transfer bodies are in an opposing relationship, and the upper movable heat transfer body heating surface 22a. The area and shape correspond to the combined area and shape of the lower fixed heat transfer body heating surface 12a and the two lower movable heat transfer body heating surfaces 14a. The upper unit 20 composed of the upper refractory frame 21, the upper movable heat transfer body 22 and the heat source 23 can be moved toward and away from the lower unit 10 by a vertical drive mechanism (not shown).

なお、図１〜図３の加熱装置では、熱源としてのブロックヒータ（１３，１５，２３）と各伝熱体（１２，１４，２２）とを別個のものとしたが、各伝熱体を省略し、ブロックヒータ（１３，１５，２３）の上面を金属板に直接接触する加熱面としてもよい。つまり各ブロックヒータ（１３，１５，２３）を、熱源であると同時に熱源としてのカートリッジヒータを内蔵した伝熱体そのものとして使用してもよい。   In addition, in the heating apparatus of FIGS. 1-3, although the block heater (13,15,23) as a heat source and each heat exchanger (12,14,22) were made separate, Omitted, the upper surface of the block heater (13, 15, 23) may be a heating surface that directly contacts the metal plate. That is, each of the block heaters (13, 15, 23) may be used as a heat transfer body that is a heat source and also has a built-in cartridge heater as a heat source.

次に、上記加熱装置の使用方法を説明する。なお、本実施形態では、被加熱物たる金属板３０として図４に示すような高張力鋼板を使用した。図４の金属板３０は、長手方向中央位置３１で最も幅広となり、両端部３２，３２に向かうほど次第に幅狭となるような、長手方向にも幅方向にも対称な形状の平板である。金属板３０の厚さは０．５〜４．０ｍｍ程度である。   Next, the usage method of the said heating apparatus is demonstrated. In the present embodiment, a high-tensile steel plate as shown in FIG. 4 is used as the metal plate 30 that is an object to be heated. The metal plate 30 of FIG. 4 is a flat plate having a symmetrical shape in both the longitudinal direction and the width direction, which is widest at the center position 31 in the longitudinal direction and gradually becomes narrower toward both ends 32 and 32. The thickness of the metal plate 30 is about 0.5 to 4.0 mm.

また、図４の金属板３０を加熱装置に搬入し、加熱完了後に加熱装置から搬出するための装置として、図３並びに図５（Ａ）及び（Ｂ）に示すような搬送装置４０を使用した。この搬送装置４０は、金属板３０の長手方向に沿って延びるやや長尺な装置本体４１と、その装置本体４１の四隅に設けられた合計４つのキャッチハンド４２とを備えている。図５（Ｂ）に示すように、各キャッチハンド４２は略Ｌ字状に構成されると共に、装置本体４１に対し軸４３を中心として回動可能に装着されている。各キャッチハンド４２は、その先端部が金属板３０の下面側に潜り込む把持位置（図５（Ｂ）に実線で示す位置）と、その把持位置から９０°外方向に回動した解放位置（図５（Ｂ）に仮想線で示す位置）との間で切替え配置可能となっている。つまり図５に示すように、金属板３０の両端部３２付近の４箇所を把持位置に配置された４つのキャッチハンド４２で把持することで、搬送装置４０は金属板３０を搬送可能となっている。   Moreover, as a device for carrying the metal plate 30 of FIG. 4 into the heating device and carrying it out of the heating device after the heating is completed, a conveying device 40 as shown in FIGS. 3 and 5A and 5B was used. . The transport device 40 includes a slightly long device body 41 extending along the longitudinal direction of the metal plate 30 and a total of four catch hands 42 provided at the four corners of the device body 41. As shown in FIG. 5 (B), each catch hand 42 is configured in a substantially L shape and is attached to the apparatus main body 41 so as to be rotatable about a shaft 43. Each catch hand 42 has a gripping position (a position indicated by a solid line in FIG. 5B) where the tip end of the catch plate sinks into the lower surface side of the metal plate 30, and a release position rotated 90 ° outward from the gripping position (FIG. 5 (B) and a position indicated by a virtual line). That is, as shown in FIG. 5, the conveying device 40 can convey the metal plate 30 by grasping the four locations near the both end portions 32 of the metal plate 30 with the four catch hands 42 arranged at the grasping positions. Yes.

加熱装置の使用に際しては先ず、各熱源１３，１５及び２３を構成するブロックヒータに電力を供給し、各伝熱体の加熱面１２ａ，１４ａ及び２２ａを９００〜９５０℃に予め加熱する。伝熱体１２，１４及び２２は、それぞれが所定の熱容量を持ち蓄熱材としても機能するため、一旦予熱昇温を完了すれば容易に冷めることはない。なお、予熱時には、下側伝熱体１２及び１４と上側伝熱体２２とを接合しておくことは好ましい（大気中への放熱が少なく早期昇温を図り易く、又、伝熱体間で均温化を図り易いため）。   When using the heating device, first, electric power is supplied to the block heaters constituting the heat sources 13, 15 and 23, and the heating surfaces 12a, 14a and 22a of the heat transfer bodies are preheated to 900 to 950 ° C. Since each of the heat transfer bodies 12, 14 and 22 has a predetermined heat capacity and also functions as a heat storage material, it is not easily cooled once the preheating temperature rise is completed. During preheating, it is preferable to join the lower heat transfer bodies 12 and 14 and the upper heat transfer body 22 (there is less heat radiation to the atmosphere and it is easy to raise the temperature quickly, and between the heat transfer bodies Because it is easy to equalize temperature).

続いて図３に示すように、上側ユニット２０を上動させて上側可動伝熱体２２を下側固定伝熱体１２及び下側可動伝熱体１４から離間させると共に、左右の下側可動伝熱体１４を退避位置に下降後退させる。そして、金属板３０を把持した搬送装置４０を下側ユニット１０と上側ユニット２０との間に進入させ、搬送装置４０により、金属板３０の中央部下面が下側固定伝熱体１２の加熱面１２ａに対して正しい位置で接触するように位置決めしながら、金属板３０を加熱面１２ａ上に載置する。このとき、左右の下側可動伝熱体１４は退避位置にあるため、金属板３０の両端部３２付近を把持している各キャッチハンド４２が左右の下側可動伝熱体１４と干渉することはない。   Subsequently, as shown in FIG. 3, the upper unit 20 is moved upward to separate the upper movable heat transfer body 22 from the lower fixed heat transfer body 12 and the lower movable heat transfer body 14 and to the left and right lower movable transfer bodies. The heating element 14 is lowered and retracted to the retracted position. And the conveying apparatus 40 holding the metal plate 30 enters between the lower unit 10 and the upper unit 20, and the lower surface of the central portion of the metal plate 30 is heated by the conveying apparatus 40 on the lower fixed heat transfer body 12. The metal plate 30 is placed on the heating surface 12a while positioning so as to come into contact with 12a at a correct position. At this time, since the left and right lower movable heat transfer bodies 14 are in the retracted position, each catch hand 42 holding the vicinity of both ends 32 of the metal plate 30 interferes with the left and right lower movable heat transfer bodies 14. There is no.

金属板３０の下側固定伝熱体１２上への載置が完了すると、搬送装置４０の全てのキャッチハンド４２が把持位置から解放位置に切替え配置され、金属板３０が搬送装置４０から解き放たれる。そして、搬送装置４０を上下ユニット１０，２０間から退出させた後、垂直駆動機構１６により各下側可動伝熱体１４が退避位置から加熱位置に切替え配置される。その結果、下側固定伝熱体１２の左右に位置する両下側可動伝熱体１４の各加熱面１４ａが、下側固定伝熱体の加熱面１２ａに対して隣り合わせに面一になると共に、下側固定伝熱体１２から左右にはみ出した金属板の端部３２の下面に面接触する。   When the placement of the metal plate 30 on the lower fixed heat transfer body 12 is completed, all the catch hands 42 of the transport device 40 are switched from the gripping position to the release position, and the metal plate 30 is released from the transport device 40. . Then, after the conveying device 40 is retracted from between the upper and lower units 10 and 20, each lower movable heat transfer body 14 is switched from the retracted position to the heating position by the vertical drive mechanism 16. As a result, the heating surfaces 14a of the lower movable heat transfer bodies 14 located on the left and right sides of the lower fixed heat transfer body 12 are flush with the heating surfaces 12a of the lower fixed heat transfer body. Then, surface contact is made with the lower surface of the end portion 32 of the metal plate that protrudes left and right from the lower fixed heat transfer body 12.

続いて図２に示すように、上側ユニット２０を下動させて上側可動伝熱体２２の加熱面２２ａを、下側固定伝熱体１２上に載置された金属板３０の上面に面接触させる。このように下側固定伝熱体１２及び２つの下側可動伝熱体１４と上側可動伝熱体２２との間に金属板３０を挟み込むことにより、当該金属板３０をその上下両面から加熱する。すると、金属板３０は極めて短時間（例えば５〜２０秒）で目標温度（９００℃）に達する。   Subsequently, as shown in FIG. 2, the upper unit 20 is moved down to bring the heating surface 22 a of the upper movable heat transfer body 22 into surface contact with the upper surface of the metal plate 30 placed on the lower fixed heat transfer body 12. Let Thus, by sandwiching the metal plate 30 between the lower fixed heat transfer body 12 and the two lower movable heat transfer bodies 14 and the upper movable heat transfer body 22, the metal plate 30 is heated from both the upper and lower surfaces. . Then, the metal plate 30 reaches the target temperature (900 ° C.) in a very short time (for example, 5 to 20 seconds).

金属板３０が目標温度に加熱されたら、上側ユニット２０を上動させて上側可動伝熱体２２を下側固定伝熱体１２及び下側可動伝熱体１４から離間させると共に、左右の下側可動伝熱体１４を退避位置に下降後退させる。そして、即座に搬送装置４０を上下ユニット１０，２０間に進入させて金属板３０の上方に移動させ、４つのキャッチハンド４２を解放位置から把持位置に切り替えて金属板端部３２の下面側に潜り込ませる。このとき、左右の下側可動伝熱体１４は退避位置にあるため、切替え回動するキャッチハンド４２が左右の下側可動伝熱体１４と干渉することはない。   When the metal plate 30 is heated to the target temperature, the upper unit 20 is moved upward to separate the upper movable heat transfer body 22 from the lower fixed heat transfer body 12 and the lower movable heat transfer body 14, and the lower left and right sides. The movable heat transfer body 14 is lowered and retracted to the retracted position. Then, the conveying device 40 is immediately moved between the upper and lower units 10 and 20 and moved above the metal plate 30, and the four catch hands 42 are switched from the release position to the gripping position so as to move to the lower surface side of the metal plate end portion 32. Let it dive. At this time, since the left and right lower movable heat transfer bodies 14 are in the retracted position, the catch hand 42 that is switched and rotated does not interfere with the left and right lower movable heat transfer bodies 14.

搬送装置４０のキャッチハンド４２で金属板３０をその下面側からすくい上げるようにして把持したら、そのまま搬送装置４０を水平移動させ、加熱装置の上下ユニット１０，２０間から次工程のプレス機に向けて高速搬送する。プレス機において、８５０℃以上の高温状態にある金属板３０を水冷されたプレス型（内部に水冷手段を備える）でプレスすることにより、金属板３０に対する付形と焼入れとが同時に行われ、成形性や引張強度等に優れたプレス成形品が得られる。   After the metal plate 30 is scooped up from the lower surface side with the catch hand 42 of the transport device 40, the transport device 40 is moved horizontally, and the space between the upper and lower units 10 and 20 of the heating device is directed to the next press machine. Transport at high speed. In the press machine, by pressing the metal plate 30 at a high temperature of 850 ° C. or higher with a water-cooled press die (equipped with water cooling means), the metal plate 30 is shaped and quenched at the same time. A press-molded product having excellent properties and tensile strength can be obtained.

（実施形態の効果）：
本実施形態によれば、金属板３０の加熱は、下側固定伝熱体１２及び下側可動伝熱体１４からなる下側伝熱体群（第１の伝熱体）と上側可動伝熱体２２（第２の伝熱体）との間に金属板３０を挟み込み、その上下両面を各伝熱体の加熱面（１２ａ，１４ａ，２２ａ）に接触させることによる固体間熱伝導によっている。このため、対流伝熱や放射伝熱を基調とした従来の加熱装置に比べて、金属板３０を目標温度に加熱するまでの時間を大幅に短縮することができる。 (Effect of embodiment):
According to this embodiment, the metal plate 30 is heated by the lower heat transfer body group (first heat transfer body) including the lower fixed heat transfer body 12 and the lower movable heat transfer body 14 and the upper movable heat transfer. The metal plate 30 is sandwiched between the body 22 (second heat transfer body) and the upper and lower surfaces thereof are brought into contact with the heating surfaces (12a, 14a, 22a) of the respective heat transfer bodies. For this reason, the time until the metal plate 30 is heated to the target temperature can be greatly shortened as compared with a conventional heating device based on convective heat transfer or radiant heat transfer.

また、金属板３０の上下両面は、各伝熱体の加熱面（１２ａ，１４ａ，２２ａ）に面接触することで空気との接触を遮断されるため、金属板表面の酸化（即ち酸化スケール等の発生）を極力防止することができる。   Further, since the upper and lower surfaces of the metal plate 30 are in contact with the heating surfaces (12a, 14a, 22a) of the respective heat transfer members, the contact with the air is cut off. Occurrence) can be prevented as much as possible.

各伝熱体（１２，１４，２２）に対応する熱源（１３，１５，２３）として、比較的小型で薄型化も可能なブロックヒータを採用しているので、加熱装置の小型化及び工場内での設置面積の縮小を図ることができる。また、ブロックヒータは電気加熱器であること、及び、ブロックヒータの加熱面全体に広い均熱エリアを確保でき熱再現性にも優れていることのために、金属板３０の温度管理がし易いという利点がある。このため、本実施形態の加熱装置は、プレス前の金属板３０の温度設定が極めて重要な要素となる熱間プレス成形のための事前加熱器として優れた適性を有する。   As the heat source (13, 15, 23) corresponding to each heat transfer body (12, 14, 22), a block heater which is relatively small and can be thinned is adopted. The installation area can be reduced. In addition, since the block heater is an electric heater, and a large soaking area can be secured on the entire heating surface of the block heater and the heat reproducibility is excellent, the temperature control of the metal plate 30 is easy. There is an advantage. For this reason, the heating device of the present embodiment has excellent suitability as a preheater for hot press forming in which the temperature setting of the metal plate 30 before pressing is a very important factor.

更に、金属板３０を下側固定伝熱体１２の載置面を兼ねた加熱面１２ａ上に搬入し又はそこから搬出する際には、上側可動伝熱体２２を下側固定伝熱体１２から離間配置することで、上下両伝熱体間に金属板の搬送装置４０が進入する空間を確保できる。それと同時に各下側可動伝熱体１４を加熱位置から退避位置に切替え配置することで、各下側可動伝熱体の加熱面１４ａが面接触し得る金属板３０の下面部分の直下にも、搬送装置４０のキャッチハンド４２が下側可動伝熱体１４と干渉せずに入り込む余地が生まれる。それ故、本実施形態によれば、搬送装置４０による金属板３０の把持や搬送が非常に楽になり、金属板３０を加熱装置に搬入又は搬出する際の位置決め精度が向上するのみならず、高温状態にある金属板３０を次工程のプレス機に搬送する時間を短縮できる。   Furthermore, when the metal plate 30 is carried in or out of the heating surface 12a which also serves as a mounting surface for the lower fixed heat transfer body 12, the upper movable heat transfer body 22 is moved to the lower fixed heat transfer body 12. By separating from the space, it is possible to secure a space for the metal plate transport device 40 to enter between the upper and lower heat transfer bodies. At the same time, by switching the lower movable heat transfer bodies 14 from the heating position to the retracted position, the heating surface 14a of each lower movable heat transfer body is also directly below the lower surface portion of the metal plate 30 where the surface contact is possible. There is room for the catch hand 42 of the transfer device 40 to enter without interfering with the lower movable heat transfer body 14. Therefore, according to the present embodiment, the gripping and transporting of the metal plate 30 by the transport device 40 becomes very easy, and not only the positioning accuracy when the metal plate 30 is carried into or out of the heating device is improved, but also the high temperature The time for conveying the metal plate 30 in the state to the press machine in the next process can be shortened.

（変更例）：上記実施形態では、下側可動伝熱体１４及びその熱源１５を垂直駆動機構１６によって垂直方向に移動させることにより、加熱位置と退避位置との切替えを行ったが、垂直駆動機構１６に代えて水平移動機構を採用し、下側可動伝熱体１４及びその熱源１５を前記加熱位置と、その加熱位置の「側方に」位置することになる退避位置との間で水平移動可能としてもよい。つまり、下側可動伝熱体１４の退避位置は、加熱位置の直下である必要はなく、加熱位置の斜め下方や側方（横）であってもよい。   (Modification): In the above-described embodiment, the lower movable heat transfer body 14 and its heat source 15 are moved in the vertical direction by the vertical drive mechanism 16 to switch between the heating position and the retracted position. A horizontal movement mechanism is employed instead of the mechanism 16, and the lower movable heat transfer body 14 and its heat source 15 are placed horizontally between the heating position and a retreat position where the heating position is to be “side”. It may be movable. That is, the retracted position of the lower movable heat transfer body 14 does not have to be directly below the heating position, and may be obliquely below or on the side (lateral) of the heating position.

（変更例）：上記実施形態では、各熱源（１３，１５，２３）をブロックヒータで構成したが、熱源の全て又は一部を火炎式加熱器等の他の発熱手段で置換してもよい。   (Modification): In the above embodiment, each heat source (13, 15, 23) is constituted by a block heater, but all or a part of the heat source may be replaced with other heat generating means such as a flame heater. .

（変更例）：上側可動伝熱体２２と対向する下側伝熱体（下側固定伝熱体１２及び下側可動伝熱体１４）の分割関係については、上記実施形態に限定されるものではなく、図６又は図７に示すような分割関係を採用してもよい。
図６の例では、下側固定伝熱体１２を金属板３０よりも長尺とし、その四隅に相当する各位置に下側可動伝熱体１４（計四つ）を配置している。つまり、下側固定伝熱体１２の加熱面１２ａの平面視形状（図に梨地模様を付す）を十二角形としている。
図７の例では、下側固定伝熱体１２及び下側可動伝熱体１４を金属板３０よりも長尺とし、金属板３０の幅方向に沿って下側固定伝熱体１２及び二つの下側可動伝熱体１４を前者を後者間に挟んで並列配置している。また図７では、搬送装置４０の本体を左側本体部４１Ａ及び右側本体部４１Ｂに分割し、両者を併せて一つの搬送装置４０としている。 (Modification): The division relationship of the lower heat transfer body (the lower fixed heat transfer body 12 and the lower movable heat transfer body 14) facing the upper movable heat transfer body 22 is limited to the above embodiment. Instead, a division relationship as shown in FIG. 6 or 7 may be adopted.
In the example of FIG. 6, the lower fixed heat transfer body 12 is longer than the metal plate 30, and the lower movable heat transfer bodies 14 (four in total) are arranged at positions corresponding to the four corners. That is, the shape of the heating surface 12a of the lower fixed heat transfer body 12 in a plan view (with a satin pattern in the drawing) is a dodecagon.
In the example of FIG. 7, the lower fixed heat transfer body 12 and the lower movable heat transfer body 14 are longer than the metal plate 30, and the lower fixed heat transfer body 12 and the two fixed heat transfer bodies 12 are arranged along the width direction of the metal plate 30. The lower movable heat transfer body 14 is arranged in parallel with the former sandwiched between the latter. In FIG. 7, the main body of the transport device 40 is divided into a left main body portion 41 </ b> A and a right main body portion 41 </ b> B, and both are combined into one transport device 40.

一実施形態に従う加熱装置の概要を示す断面図。Sectional drawing which shows the outline | summary of the heating apparatus according to one Embodiment. 金属板加熱時における加熱装置の断面図。Sectional drawing of the heating apparatus at the time of metal plate heating. 金属板を搬入又は搬出するときの加熱装置の断面図。Sectional drawing of a heating apparatus when carrying in or carrying out a metal plate. 金属板の一例を示す平面図。The top view which shows an example of a metal plate. 金属板と搬送装置との関係を示し、（Ａ）は平面図、（Ｂ）は左又は右から見た側面図。The relationship between a metal plate and a conveying apparatus is shown, (A) is a top view, (B) is the side view seen from the left or the right. 一変更例を示す図５（Ａ）相当の平面図。The top view equivalent to FIG. 5 (A) which shows the example of a change. 一変更例を示す図５（Ａ）相当の平面図。The top view equivalent to FIG. 5 (A) which shows the example of a change.

符号の説明Explanation of symbols

１０…下側ユニット、１１…下側耐火性枠体、１２…下側固定伝熱体（第１の伝熱体）、１２ａ…上端面（載置面を兼ねた加熱面）、１３…熱源、１４…下側可動伝熱体（第１の伝熱体）、１４ａ…上端面（加熱面）、１５…熱源、１６…垂直駆動機構、２０…上側ユニット、２１…上側耐火性枠体、２２…上側可動伝熱体（第２の伝熱体）、２２ａ…下端面（加熱面）、２３…熱源、３０…金属板、４０…金属板の搬送装置、４２…キャッチハンド。   DESCRIPTION OF SYMBOLS 10 ... Lower unit, 11 ... Lower fire-resistant frame, 12 ... Lower fixed heat transfer body (1st heat transfer body), 12a ... Upper end surface (heating surface which also serves as a mounting surface), 13 ... Heat source 14 ... Lower movable heat transfer body (first heat transfer body), 14a ... Upper end surface (heating surface), 15 ... Heat source, 16 ... Vertical drive mechanism, 20 ... Upper unit, 21 ... Upper fireproof frame, DESCRIPTION OF SYMBOLS 22 ... Upper movable heat transfer body (2nd heat transfer body), 22a ... Lower end surface (heating surface), 23 ... Heat source, 30 ... Metal plate, 40 ... Metal plate conveying apparatus, 42 ... Catch hand.

Claims (4)

金属板の一方の面に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する第１の伝熱体と、
金属板の他方の面に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する第２の伝熱体とを備え、
前記第１伝熱体の加熱面と前記第２伝熱体の加熱面との間に金属板を挟み込んで当該金属板を加熱することを特徴とする熱間プレス用金属板の加熱装置。 A first heat transfer body having a heating surface capable of surface contact with one surface of the metal plate, and transferring heat of the heat source to the metal plate through the heating surface;
A heating surface capable of surface contact with the other surface of the metal plate, and a second heat transfer body that transfers heat of the heat source to the metal plate through the heating surface;
An apparatus for heating a metal plate for hot pressing, wherein a metal plate is sandwiched between a heating surface of the first heat transfer body and a heating surface of the second heat transfer body to heat the metal plate. 金属板をほぼ水平に載置可能な載置面を兼ねた、金属板の下面の一部に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する下側固定伝熱体と、
前記下側固定伝熱体に隣接して設けられると共に、金属板の下面の一部に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する下側可動伝熱体と、
前記下側固定伝熱体及び下側可動伝熱体の上方においてこれらに接近離間可能に設けられると共に、金属板の上面に面接触可能な加熱面を有し、その加熱面を介して熱源の熱を金属板に伝達する上側可動伝熱体とを備え、
前記下側可動伝熱体は、その加熱面が前記下側固定伝熱体の載置面を兼ねた加熱面に載置された金属板の下面に接触する加熱位置と、当該加熱面が前記加熱位置よりも下方又は側方に位置することになる退避位置との間を移動可能となっていることを特徴とする熱間プレス用金属板の加熱装置。 A heating surface that can be brought into surface contact with a part of the lower surface of the metal plate, which also serves as a mounting surface on which the metal plate can be mounted almost horizontally, and heat from the heat source is transmitted to the metal plate through the heating surface. A lower fixed heat transfer body,
A lower side that is provided adjacent to the lower fixed heat transfer body and has a heating surface that can be brought into surface contact with a part of the lower surface of the metal plate, and transmits heat from the heat source to the metal plate through the heating surface. A movable heat transfer body,
The lower fixed heat transfer body and the lower movable heat transfer body are provided so as to be close to and away from each other, and have a heating surface that can come into surface contact with the upper surface of the metal plate. An upper movable heat transfer body that transfers heat to the metal plate;
The lower movable heat transfer body has a heating position where the heating surface comes into contact with the lower surface of the metal plate placed on the heating surface also serving as the placement surface of the lower fixed heat transfer body, A heating apparatus for a hot-pressing metal plate, characterized in that it can move between a retreat position that is located below or to the side of the heating position. 前記熱源の少なくとも一つは、ブロックヒータであることを特徴とする請求項１又は２に記載の熱間プレス用金属板の加熱装置。   The apparatus for heating a metal sheet for hot pressing according to claim 1 or 2, wherein at least one of the heat sources is a block heater. 前記伝熱体の少なくとも一つは、熱源としてのカートリッジヒータを内蔵したブロックヒータによって構成されることを特徴とする請求項１又は２に記載の熱間プレス用金属板の加熱装置。   The apparatus for heating a metal plate for hot pressing according to claim 1 or 2, wherein at least one of the heat transfer members is constituted by a block heater incorporating a cartridge heater as a heat source.
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