JP4575578B2

JP4575578B2 - Hot plate of press machine and press machine

Info

Publication number: JP4575578B2
Application number: JP2000349137A
Authority: JP
Inventors: 岡崎静明
Original assignee: Kitagawa Seiki KK
Current assignee: Kitagawa Seiki KK
Priority date: 2000-11-16
Filing date: 2000-11-16
Publication date: 2010-11-04
Anticipated expiration: 2020-11-16
Also published as: JP2002144435A

Description

【０００１】
【産業上の利用分野】
本発明は、たとえばプラスティック製のＩＣカード（インテグレーテド・サーキット・カード）やプリント基板（PWB）などの被加工物を加熱・加圧して成形するプレス装置の熱板、及びプレス装置に関する。
【０００２】
【従来技術】
従来、プラスティク成形品、たとえばＩＣカードを製造するには、コアシートの貫通孔にＩＣとコイルを挿入し、このコアシートとインナシートを表面側、裏面側の双方からそれぞれオーバーシートで挟んだ状態でプレス装置により加熱・加圧して成形した後、冷却することで、これらのシートを一体成形している。
この加熱・加圧は、上下一対に設けた加圧定盤にそれぞれ取付けられた熱板間にＩＣカード等を挟んで行っていた。この熱板としては、熱板本体内部に形成した孔にヒーターを配置固定し、孔の内壁とヒーターの外周との間の隙間で形成した加熱流路に油などの熱媒を流すようにしたものが知られている（たとえば、本出願人の出願にかかる実公平６−27364号公報に記載のもの）。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記構成の熱板は、上記公告公報に記載されているように熱媒、加熱量が少なくて済む上、コンパクトな設備になると言った利点を有するものの、設備諸元や使用条件等によっては、ヒーターの周りをヒーターの軸線に沿って流れる熱媒によりヒーター自身が振動され、ヒーター端部を熱板に取付けるフランジ部やヒータートリップにクラックが発生してしまうケースがある。こういったケースでは、その対策として、ヒーターやその取付け部の強度をより強くせねばならず、取付け部等の大型化や高剛性材料の使用に起因した高コスト化が避けられなかった。
【０００４】
【発明の目的】
本発明の目的は、熱媒がヒーターに沿って加熱流路を流れても、ヒーターの取付け部の強度をさほど大きくすることなく取付け部等の破損を防止でき、ヒーターの耐久性を向上させることができるようにしたプレス装置の熱板及びプレス装置を提供することにある。
【０００５】
【課題を解決するための手段】
本発明のプレス装置の熱板では、熱板が一対の定盤間に設けられる。この熱板は、熱板本体に油などの熱媒を流入させる入口と、この熱媒を排出する出口とを形成し、入口、出口間を接続する孔を熱板本体内部に形成する。また、この孔内にヒーターを挿入配置してヒーター外周と孔の内壁と間との隙間で形成した加熱流路を設けて、入口、加熱流路、出口と熱媒が流れるようにする。
ヒーターの一端部を熱板本体の一方の側面に固定するとともに、ヒーターの他端部を熱板本体の他方の側面側に設けた有底穴（いわゆる盲穴）に挿入する。この挿入にあっては、ヒーター等の熱膨張が安定した定常稼働時に、有底穴とこの有底穴に挿入した電気ヒーターの他端部との間に径方向及び軸方向の間隙を有するように、有底穴とヒーターの各径の大きさ、軸長さが予め設定してある。この径方向の間隙は、加熱流路を熱媒が流れるときヒーターの振動を抑える大きさに設定してある。
上記径方向の間隙は、好ましくは、その断面積が加熱流路の断面積より小さくなるようにする。
【０００６】
被加工物を加熱・加圧するにあたっては、熱板の入口から孔内壁とヒーター外周との隙間で形成した加熱流路に熱媒を流す。加熱流路内では、熱媒がヒーターにより加熱され、この熱を熱板本体に伝えることで、熱板を加熱する。
この加熱によりヒーターの外径、有底穴の内径も膨張していくが、これらの膨張が安定した定常稼働時になっても、有底穴とヒーターとの間には径方向及び軸方向の間隙が生じるようにされている。
したがって、熱媒が加熱流路を流れていくとき、熱媒がヒーターに加振力を作用するものの、ヒーターと有底穴との間隙により、ヒーターの振動が抑制され、ヒーターの両端を固定した場合に比べヒーター取付け部等が破損しにくくなり耐久性が向上する。
【０００７】
上記ヒーターは、好ましくは、電気ヒーターとし、この電気ヒーターに電力を供給する配線をヒーターの一端部固定側から取り出すようにする。
これにより、加熱温度の調整をヒーターに供給する電力をコントロールすることででき、しかも電気ヒーターへの配線を固定したフランジ部側で行うので、各ヒーターの配線をまとめて一方側から取り出すことが可能となる。
上記ヒーターは、好ましくは、熱板本体の孔から突出させたヒーターの一端部側部分に設けたフランジ部にて熱板本体の側面に固定する。この固定にあっては、フランジ部と熱板本体の側面との間にシールパッキンを挟んでおく。
これにより、熱媒の漏れを確実に阻止しながらヒーターの一端を固定できる。
上記加熱流路は、好ましくは、加熱流路の断面積が、入口、出口の断面積に略等しくなるようにする。
これにより、熱媒の熱板内流速が一定となり、表面熱伝達率も一定となって、熱板を安定した温度分布に保つことができる。
上記加熱流路は、好ましくは、隣接する加熱流路を並列配置して構成し、この上流の熱媒を分流させて並列配置した各加熱流路から同一方向に流した後この下流で合流させるようにする。この場合、望ましくは、この並列配置の加熱流路の合計断面積を、入口及び出口の断面積に略等しくなるように設定する。
これにより、熱板の加熱面積が大きい場合、加熱流路を多数設ける必要があるが、上流の熱媒を分岐し、隣接した加熱流路を並列配置して同一方向に流し、この下流で合流させるようにしたので、１本づつ加熱流路を直列配置した場合に比べ、流通抵抗を小さくできる。また、熱媒の熱板内流速が一定となり、表面熱伝達率も一定となって、熱板を安定した温度分布に保つことができる。
上記加熱流路は、一端側から他端側に熱媒が流れる加熱流路と他端側から一端側に熱媒が流れる加熱流路とを交互に蛇行配置させて構成する。
これにより、熱媒により熱板の各部位によって温度が異なるのを抑えることが可能となる。
また、プレス装置は、好ましくは、以上のように構成した熱板をプレス装置の一対の加圧定盤間に配置して構成する。この場合、熱板は加圧定盤に直接取付けてもよいし、あるいは加圧定盤に直接取付けることなく加圧定盤間に配置して加圧定盤により移動させるようにしてもよい。
これにより、上記特徴を有する熱板間で加熱・加圧することが可能となる。
また、プレス装置は、好ましくは、上記いずれのタイプのプレス装置にあっても、加圧定盤に設けた熱板間にさらに少なくとも１個以上の熱板を配置する多重配置としてもよい。
これにより、被加工物を多重に配置した状態で一度に多数の被加工物を加熱加圧することが可能となる。
【０００８】
【実施の形態】
以下、本発明の実施形態を図１に基づき説明する。
図１は、プレス装置１の全体を示している。同図において、プレス装置１は、フレーム２の上側部位に固定定盤３が固定されるとともに、この固定定盤３の下側に可動定盤４が設けられる。この可動定盤４は油圧シリンダ５により上下動可能とされている。この油圧シリンダ５は、油圧配管６にて油圧ポンプ等の油圧源７に接続され、油圧配管６の途中に設けた切替バルブ１７により油の供給・排出が行われる。切替バルブ１７と油圧源７とは、コントロール・ユニット８により作動が制御される。なお、図中、これらの制御用の配線等は省略して描いてある。
上記プレス装置１にあっては、固定定盤３の下面に断熱材９を介して上側熱板１０が、また可動定盤４の上面に断熱材１１を介して下側熱板１２がそれぞれ取付けられている。
【０００９】
図２は、油圧回路に接続された熱板の詳細構造断面を示す。図３は、この熱板の断面を側方からみた図である。なお、この熱板は、上側熱板、下側熱板で押圧方向等が異なるものの、両者とも実質的に同じ構成である。
図２に示すように、直方体形状の熱板本体１３には、この１辺に平行な６本の貫通孔１４Ａ〜１４Ｆが所定間隔ごとに形成されるとともに、貫通孔１４Ａ〜１４Ｆの両端側位置で、貫通孔１４Ａ〜１４Ｆにそれぞれ直交する連絡貫通孔１５Ａ、１５Ｂが形成される。したがって、各貫通孔１４Ａ〜１４Ｆは、両端部分で連絡貫通孔１５Ａ、１５Ｂを介して連通する。
また、上記貫通孔１４Ａ〜１４Ｆ内には、これらの貫通孔径Ｄより小径ｄの電気ヒーター１６Ａ〜１６Ｆをそれぞれ挿入するとともに、貫通孔内壁とヒーター外周部との間の隙間にて加熱流路２８Ａ〜２８Ｆを形成して、熱媒としての油を流すようにする。
ここで、入口２６、出口２７、連絡貫通孔１５Ａ、１５Ｂの断面積は、同一としてある。また、加熱流路２８Ａ〜２８Ｆの断面積も、入口２６、出口２７、及び連絡貫通孔１５Ａ、１５Ｂの各断面積と略等しくなるように設定してあるが、図では連絡貫通孔１５Ａ、１５Ｂ等に比べ小さく描いてある。
【００１０】
次に、上記電気ヒーターの熱板本体への取付け構造を、図４及び図５に示す。なお、図４及び図５は、各電気ヒーターの取付け構造が実質的に同一であることから、電気ヒーター１６Ｃの取付け構造部分を代表として取り上げ示したものである。
同図において、電気ヒーター１６Ｃの一端側には四角形状のフランジ部１８Ｃが設けられており、このフランジ部１８ｃを熱板本体１３の一端側側面に四本のボルト２１Ａ〜２１Ｄにて取付けることで、電気ヒーター１６Ｃが熱板本体１３に固定される。なお、このフランジ部１８Ｃの固定にあっては、図４に示すように、フランジ部１８Ｃの取付け面に形成した環状溝１９Ｃにシールパッキン２０Ｃを挿入し、このシールパッキン２０Ｃを熱板本体１３とフランジ部１８Ｃ間で圧着した状態にしておくことで、貫通孔１４Ｃからの油漏れを防ぐようにしてある。
また、図２〜図５に示されるように、フランジ部１８Ａ〜１８Ｆから外側へ突出させた各ヒーター１６Ａ〜１６Ｆの一端部からは、それぞれ配線２２Ａ〜２２Ｆが取り出されてサイリスター・ユニット３５に接続されている。サイリスター・ユニット３５は、コントロール・ユニット８にて制御される。コントロール・ユニット８は、熱板本体１３に取付けた温度センサ３４から熱板の温度信号を受け取り、この信号に基づき必要な電力信号をサイリスター・ユニット３５に発信することで、サイリスター・ユニット３５からのサイリスター出力を熱板温度に基づきフィードバック制御し、電気ヒーター１６Ａ〜１６Ｆの温度を最適範囲に保つようにしてある。
ここで、貫通孔１４Ａ〜１４Ｆの径の大きさは、電気ヒーター１６Ａ〜１６Ｆの径より十分大きいので、組立時に電気ヒーター１６Ａ〜１６Ｆを貫通孔１４Ａ〜１４Ｆの一端側開口部から挿入し易い上、組立後も油の流れで電気ヒーター１６Ａ〜１６Ｆが貫通孔内壁と相互干渉することはない。
【００１１】
一方、熱板本体１３の貫通孔１４Ａ〜１４Ｆの他端側端には、有底穴２４Ａ〜２４Ｆが形成された円柱状の支持部材２３Ａ〜２３Ｆが液密に溶接固定される。そして、これらの有底穴２４Ａ〜２４Ｆには、各電気ヒーター１４Ａ〜１４Ｆの他端部が径方向と軸方向とに間隙を有するようにして遊嵌される。
この場合、電気ヒーター１６Ａ〜１６Ｆと有底穴２４Ａ〜２４Ｆとの間隙の断面積を上記加熱流路２８Ａ〜２８Ｆの断面積より小さくする。すなわち、電気ヒーター１６Ａ〜１６Ｆとして、外径１５ｍｍで長さ９００ｍｍ程度、あるいは外径１７．５ｍｍで長さ９００ｍｍ〜１３００ｍｍ程度の通常よく用いられるものを使用する場合、有底穴２４Ａ〜２４Ｆの内径をＤ、電気ヒーター１６Ａ〜１６Ｆの外径をｄとすると、定常稼働時、したがって電気ヒーター１６Ａ〜１６Ｆの熱膨張が安定した状態（もちろんこのとき有底穴も熱膨張している）にあるとき、電気ヒーター１６Ａ〜１６Ｆ外周部と有底穴２４Ａ〜２４Ｆの径方向差（Ｄ−ｄ）が０．２ｍｍ〜０．４ｍｍ程度となるように設定してある。
言いかえれば、上記間隙の設定は、電気ヒーター１６Ａ〜１６Ｆ等が室温となっている非稼働時には、上記径方向差（Ｄ―ｄ）が、有底穴２４Ａ〜２４Ｆの内径と電気ヒーター１６Ａ〜１６Ｆの外径との径方向における熱膨張差分に、上記設定差分０．２ｍｍ〜０．４ｍｍを加算した大きさにしてあることを意味する。
上記にあっては、加熱流路内における熱媒の流速は、熱板内を油が通過する時間が短くなるようにして熱板の温度ばらつきを抑えるため、たとえば３ｍ／秒程度としている。
なお、図では分かり易くするため、間隙の大きさを（図４では電気ヒーター１６Ｃのみを熱膨張時の状態を実線で、また非熱膨張時の状態を二点鎖線で）誇張して描いてある。
また、上記径方向の間隙に加え、有底穴２４Ａ〜２４Ｆの底と電気ヒーター１６Ａ〜１６の他端部先端との間にも、定常稼働時の熱膨張状態にあっても、上記半径方向の間隙よりさらに大きい軸方向の間隙が常に生じるように設定してある。
【００１２】
熱板本体１３には、上記のように貫通孔１４Ａ〜１４Ｆに電気ヒーター１６Ａ〜１６Ｆが挿入されて加熱流路２８Ａ〜２８Ｆが形成されるとともに、一端部側（図２中、下側）に位置する連絡貫通孔１５Ａの両端が開口のままとされて、図２中、右端側の開口が油の入口２６、左端側の開口が油の出口２７とされる。
また、隣接する貫通孔１４Ａ〜１４Ｆ間を接続する連絡貫通孔１５Ａ、１５Ｂの接続部分に、円柱状の閉塞部材２５Ａ〜２５Ｇを、一端部側（図２中の下方側）と他端部側（図２中の上方側）とで二つおきになるようにして溶接し閉塞する。この結果、貫通孔１４Ａ〜１４Ｆはこの順に直列配置されることになり、隣接する貫通孔１４Ａ〜１４Ｆ、したがって加熱流路２８Ａ〜２８Ｆは、一端部側の連絡貫通孔１５Ａと他端部側の連絡貫通孔１５Ｂとによって交互に接続されることになる。
したがって、入口２６から供給された油は、加熱流路２８Ａ（一端側から他端側へ）、他端側の連絡貫通路１５Ｂ、隣の加熱流路２８Ｂ（他端側から一端側へ）、一端側の連絡貫通孔１５Ａ、隣の加熱流路２８Ｃ（一端側から他端側へ）、他端側の連絡貫通孔１５Ｂ、隣の加熱流路２８Ｄ（他端側から一端側へ）、一端側の連絡貫通孔１５Ａ、加熱流路２８Ｅ（一端側から他端側へ）、他端側の連絡貫通孔１５Ｂ、隣の加熱流路２８Ｆ（一端側から他端側へ）の順に蛇行して、最終的に出口２７から排出される。
【００１３】
上記熱板本体１３は、入口２６に油圧パイプ２９を介して電気モータ３８により駆動される油圧ポンプ３０の吐出し口を接続する一方、出口２７に油圧パイプ２９を接続して油圧ポンプ３０の吸込み口に接続することで、油を供給循環可能としている。油圧ポンプ３０の吸込み口の上流には、熱膨張調整用のタンク３９を接続し、油圧回路中の油の熱膨張による体積変化を調整可能にしてある。また、熱板本体の出口２７と油圧ポンプ３０とを結ぶ油圧パイプ２９の途中から分岐する分岐パイプ３２が設けられ、分岐パイプ３２中のオイルクーラー３３を経て油圧パイプ２９の油圧ポンプ３０上流側へ合流するようにしてある。３３ａはオイルクーラー３３の油の入口、３３ｂは油の出口であり、３３ｃは冷却水の出口、３３ｄは冷却水の入口である。上記分岐部分には、切替えバルブ３１（三方弁）が設けられて、出口２７から排出される油を、油圧パイプ２９を通って直接油圧ポンプ３０へ戻るか、分岐パイプ３２へ流れてオイルクーラー３３にて冷却された後、油圧ポンプ３０へ戻るように切り替え可能としてある。
コントロール・ユニット８は、温度センサ３４で検出した温度が所定値より高くなったら分岐パイプ３２を開き出口２７から吐出された油をオイルクーラー３３へ送り込んで冷却し、温度が所定値以下であれば出口２７からの油が分岐パイプ３２へ流れ込むのを阻止して直接油圧ポンプ３０へ戻すように判断する。この判断結果に基づく制御信号が切替バルブ３１へ送られ、切替バルブ３１による油の流れの切替が可能としてある。
この場合、上記所定値は、切替えバルブ３１の開閉を決定する温度間にヒステリシスを設けてもよい。
なお、これらの油圧回路、制御回路は、図１に示すように上側熱板１０側と下側熱板１２側とを共通とし、上側熱板１０の温度を検出してフィードバック制御するようにしたが、下側熱板１２の温度を検出するようにしてもよく、あるいは、それぞれの熱板１０、１２ごとに温度を検出して別々の油圧回路及び制御回路を設けるようにしてもよい。
【００１４】
次に、上記プレス装置の作用につき説明する。
プレス装置１を始動すると、油圧ポンプ３０が油を熱板１０、１１へ供給し始める。と同時に電気ヒーター１６Ａ〜１６Ｆにもサイリスター・ユニット３５から電力が供給されて熱板１０、１１内の加熱通路２８Ａ〜２８Ｆにある油を加熱し始める。この結果、加熱された油は、熱を熱板本体１３へ伝え、熱板１０、１１全体の温度を上昇させていく。このとき、温度センサ３４で検出した温度が所定値以下なので、切替バルブ３１は分岐パイプ３２を閉じて、熱板１０、１１の出口２７から排出された油を直接油圧ポンプ３０へ吸込まさせ、再度、熱板１０、１１へ送り込んで循環させる。
この電気ヒーター１６Ａ〜１６Ｆによる加熱は、熱板１０、１１が目標温度になるまで続けられる。熱板の温度が所定値より高くなったら、コントロール・ユニット８がサイリスター・ユニット３５からの電気ヒーター１６Ａ〜１６Ｆへの給電量を減らしたり停止したりするとともに、切替バルブ３１にて分岐パイプ３２を開きオイルクーラー３３で油を冷却するなどして熱板１０、１１の温度が過大にならないようにして熱板温度を目標温度に維持する。
【００１５】
上記加熱による熱板１０、１１や電気ヒーター１６Ａ〜１６Ｆの温度上昇に伴って、熱板１０、１１の有底穴２４Ａ〜２４Ｆや電気ヒーター１６Ａ〜１６Ｆは、熱膨張しそれらの軸方向寸法、外径寸法が増大していくが、温度が安定した定常稼働時になるとその膨張は安定してほぼ一定となる。
この場合、電気ヒーター１６Ａ〜１６Ｆの他端部側先端と支持部材２３Ａ〜２３Ｆの有底穴の底部２４Ａａ〜２４Ｆａとの軸方向間隙は、加熱による上記熱膨張安定時における電気ヒーター１６Ａ〜１６Ｆの軸方向熱膨張を十分見込んだ大きさに予め設定してあるので、これら同士が当接して破損するようなことはない。
また、有底穴２３Ａ〜２３Ｆの内径と電気ヒーター１６Ａ〜１６Ｆの他端部の外径との径方向の間隙も、上記熱膨張が安定したときでも微小の間隙が確保された状態となっており、油が加熱流路２８Ａ〜２８Ｆ内を流れても電気ヒーターの両端を固定した場合に比べて電気ヒーター１６Ａ〜１６Ｆの振動が抑えられる。
本発明者の実験によると、電気ヒーター１６Ａ〜１６Ｆが、通常用いられる外径１５ｍｍで長さ９００ｍｍ程度、あるいは外径１７．５ｍｍで長さ９００ｍｍ〜１３００ｍｍ程度のもので、熱媒の流速が３ｍ／秒程度の場合、有底穴内径Ｄとヒーター外径ｄと間隙差（Ｄ―ｄ）が０．２ｍｍ〜０．４ｍｍ程度とした場合が、もっとも耐久性が良かった。
一方、熱板の加熱にあっては、加熱流路２８Ａ〜２８Ｆの断面積が入口、出口と略等しく設定してあるので、熱板内流速が一定速となり、表面熱伝達も一定となって熱板をより安定した温度分布に保つことができる。
【００１６】
図６は、熱板の他の実施態様で、熱板の加熱・加圧面積をさらに大きくして、電気ヒーターの本数をさらに増した場合を示す。
この場合、図２の実施態様のように、各加熱流路を１本づつ単純に直列配置すると、流通抵抗が増大し好ましくないので、本実施態様では、隣接する複数の加熱流路を並列配置にして、これら並列の加熱流路を単位として直列配置するようにしたことを特徴とする。
すなわち、同図において、熱板本体１３には両端に他端側が閉塞された有底孔１４ａ、１４ｊが形成されるとともに、これら間に８本の貫通孔１４ａ〜１４ｈが設けられる。これらの有底孔及び貫通孔１４ｂ〜１４ｉには、これらと直交して一端側（図６の下側）と他端側（図６の上側）に連絡貫通孔１５Ａ、１５Ｂが１本づつそれぞれ設けられる。
上記一端側の連絡貫通孔１５Ａにあっては、この連絡通路１５Ａの両端の開口部にそれぞれ閉塞部材２５ａ、２５ｉが、また貫通孔１４ａ〜１４ｂ間、貫通孔１４ｅ〜１４ｆ間、貫通孔１４ｉ〜１４ｊ間の部分に円柱状の閉塞部材２５ｃ、２５ｅ、２５ｇが、それぞれ液密に溶接固定される。
同様に、他端側の連絡貫通孔１５Ｂにあっても、この連絡貫通孔１５Ｂの両端の開口部にそれぞれ閉塞部材２５ｂ、２５ｈが、また貫通孔１４ｃ〜１４ｄ間、貫通孔１４ｇ〜１４ｈ間に円柱状の閉塞部材２５ｄ、２５ｆが、それぞれ液密に溶接固定される。
なお、有底孔１４ａ、１４ｊの一端側開口は、開口のままとし、それぞれ入口２６、出口２７とする。
【００１７】
上記８本の貫通孔１４ｂ〜１４ｉ内には、１本づつ計８本の電気ヒーター１６Ａ〜１６Ｈが挿入され、これらの貫通孔内壁と電気ヒーター外周との間の隙間で、熱媒を流す加熱流路２８ａ〜２８ｈを構成する。
ここで、入口２６、出口２７、有底孔１４ａ、１４ｊ、及び連絡貫通孔１５Ａ、１５Ｂは、これらの断面積が加熱流路２８ａ〜２８ｈの断面積の約２倍となるように設定しておく。
電気ヒーター１６Ａ〜１６Ｈは、これらの一端側端部に固定したフランジ部１８Ａ〜１８Ｈにより、熱板１３の一端側の側面にシールパッキンを挟んだ状態で固定され、他端側端部が貫通孔１４ｂ〜１４ｉの他端側部分に液密に溶接固定した支持部材２３Ａ〜２３Ｈの有底穴２４Ａ〜２４Ｈに挿入される。電気ヒーター１６Ａ〜１６Ｈの他端部と有底穴２４Ａ〜２４Ｈとは、径方向及び軸方向の間隙を有して挿入してある。これらの間隙は、図２、図４の実施態様と同じく熱膨張が安定した定常稼働時に約０．２ｍｍ〜０．４ｍｍの径方向差となり、かつ軸方向にもそれ以上の大きさで隙間ができるように設定してある。
【００１８】
したがって、上記のように構成した熱板の油圧回路にあっては、有底孔１４ａの開口から流入した油は、この他端側へ流れて他端側の連絡貫通孔１５Ｂへ行き、ここから一端側の連絡通路１５Ａとの間を、２本の並列配置した加熱流路を次々蛇行しながら流れた後、他端側の連絡貫通孔１５Ｂから有底孔１４ｊまでたどり着き出口２７から流出する。
すなわち、入口２６から大径の有底孔１４ａから流れ込んだ油は、他端側連絡貫通孔１５Ｂを介して分流され二つの加熱流路２８ａと２８ｂの他端側へ受け渡され、ここで電気ヒーター１６Ａ、１６Ｂにより加熱されながら加熱流路２８ａ、２８ｂの一端側へ向かい、一端側の連絡貫通孔１５Ａで合流した後、再度分流されて二つの加熱流路２８ｃと２８ｄへ流れ込み、電気ヒーター１６Ｃ、１６Ｄで加熱されながら加熱流路２８ｃ、２８ｄの一端側から他端側へ流れる。同様に、他端側に到着した油は、連絡貫通孔１５Ｂで合流した後、再度分流して二つの加熱流路２８ｅ、２８ｆへ向かい、これらの他端側から一端側へ加熱されながら流れ、一端側の連絡貫通孔１５Ａで合流した後、また分流して二つの加熱流路２８ｇ、２８ｈを一端側から他端側へ加熱されながら流れる。油は加熱流路２８ｇ、２８ｈの他端側において連絡貫通孔１５Ｂを介して有底孔１４ｊに受け渡され、熱板本体１３の出口２７から排出される。
【００１９】
この実施態様にあっては、広い熱板面積に対応するように電気ヒーターの本数を最初の実施態様のものよりも増加させているが、断面積が連絡貫通孔１５Ａ、１５Ｂ、入口２６、出口２７の約２分の１倍しかない加熱流路を２本づつ並列配置して連絡貫通孔１５Ａ、１５Ｂ間を流すようにしたので、各加熱流路を１本づつ直列配置した場合に比べ流路抵抗が減少する。また、熱板の加熱にあっては、並列配置した二つの加熱流路の合計断面積が入口、出口の断面積と略等しく設定してあるので、熱板内流速が一定速となり、表面熱伝達も一定となって熱板をより安定した温度分布に保つことができる。
しかも、各加熱流路を流れる油量は、１本の加熱流路の断面積が、入口２６、出口２７、有底孔１４ａ、１４ｊ、及び連絡貫通孔１５Ａ、１５Ｂの断面積に対し約２分の１倍となるように設定してあるので、加熱流路の断面積を入口２６、出口２７等の断面積と同一にする場合に比べ熱板内の熱媒が少ない量で済むことで加熱時のランニング・コストを軽減できる。
【図面の簡単な説明】
【図１】本発明のプレス装置の全体を示す図である。
【図２】本発明に係る熱板の正面断面図である。
【図３】図２中、ＩＩＩ−ＩＩＩからみた熱板の一部断面側面図である。
【図４】図２の電気ヒーター及びこの取付け部分を拡大して示す断面図である。
【図５】図４の電気ヒーターのフランジ部取付け部分の側面図である。
【図６】他の実施態様による熱板の正面断面図である。
【符号の説明】
１プレス装置
３固定定盤
４可動定盤
７油圧源
８コントロール・ユニット
１０上側熱板
１２下側熱板
１３熱板本体
１４Ａ〜１４Ｇ、１４ｂ〜１４ｉ貫通孔（孔）
１５Ａ、１５Ｂ連絡貫通孔
１６Ａ〜１６Ｈ電気ヒーター
１８Ａ〜１８Ｈフランジ部
１９Ｃ環状溝
２０Ｃシールパッキン
２４Ａ〜２４Ｈ有底穴
２５Ａ〜２５Ｇ、２５ａ〜２５ｉ閉塞部材
２６入口
２７出口
２８Ａ〜２８Ｆ、２８ａ〜２８ｈ加熱流路
３０油圧ポンプ
３３オイルクーラー
３４油温センサ
３５サイリスター・ユニット[0001]
[Industrial application fields]
The present invention relates to a hot plate of a press device for forming a workpiece such as a plastic IC card (integrated circuit card) or a printed circuit board (PWB) by heating and pressing, and the press device.
[0002]
[Prior art]
Conventionally, in order to manufacture a plastic molded product, for example, an IC card, an IC and a coil are inserted into a through hole of a core sheet, and the core sheet and the inner sheet are sandwiched by oversheets from both the front side and the back side. These sheets are integrally formed by heating and pressurizing with a press device in a state and then cooling.
This heating and pressurization is performed by sandwiching an IC card or the like between hot plates attached to pressurization surface plates provided in a pair of upper and lower sides. As this hot plate, a heater is arranged and fixed in a hole formed inside the hot plate main body, and a heat medium such as oil is allowed to flow through a heating channel formed by a gap between the inner wall of the hole and the outer periphery of the heater. Are known (for example, those described in Japanese Utility Model Publication No. 6-27364 concerning the application of the present applicant).
[0003]
[Problems to be solved by the invention]
However, as described in the above publication, the heat plate having the above structure has the advantage that it requires a small amount of heating medium and heating amount, and becomes a compact facility. In some cases, the heater itself is vibrated by the heat medium flowing around the heater along the axis of the heater, and cracks occur in the flange portion and heater trip where the heater end is attached to the hot plate. In such a case, as a countermeasure, the strength of the heater and its mounting portion must be increased, and the increase in cost due to the increase in the size of the mounting portion and the use of a high-rigidity material cannot be avoided.
[0004]
OBJECT OF THE INVENTION
The object of the present invention is to prevent damage to the mounting part without increasing the strength of the heater mounting part even if the heat medium flows through the heating flow path along the heater, thereby improving the durability of the heater. It is an object of the present invention to provide a hot plate of a press device and a press device that can perform the above.
[0005]
[Means for Solving the Problems]
In the hot plate of the press device of the present invention, the hot plate is provided between a pair of surface plates. The hot plate forms an inlet for allowing a heat medium such as oil to flow into the hot plate main body and an outlet for discharging the heat medium, and forms a hole connecting the inlet and the outlet inside the hot plate main body. Further, a heater is inserted into the hole and a heating channel formed by a gap between the outer periphery of the heater and the inner wall of the hole is provided so that the inlet, the heating channel, the outlet, and the heat medium flow.
One end of the heater is fixed to one side of the hot plate main body, and the other end of the heater is inserted into a bottomed hole (so-called blind hole) provided on the other side of the hot plate main body. In this insertion, there is a radial and axial gap between the bottomed hole and the other end of the electric heater inserted into the bottomed hole during steady operation where the thermal expansion of the heater or the like is stable. In addition, the diameter of each of the bottomed hole and the heater and the shaft length are preset. The radial gap is set to a size that suppresses vibration of the heater when the heat medium flows through the heating flow path.
The radial gap preferably has a cross-sectional area smaller than that of the heating channel.
[0006]
In heating and pressurizing the workpiece, a heating medium is caused to flow from the inlet of the hot plate to a heating flow path formed by a gap between the hole inner wall and the heater outer periphery. In the heating channel, the heat medium is heated by the heater, and this heat is transmitted to the main body of the hot plate to heat the hot plate.
This heating also expands the outer diameter of the heater and the inner diameter of the bottomed hole, but even when these expansions are stable during steady operation, there are radial and axial gaps between the bottomed hole and the heater. Is supposed to occur.
Therefore, when the heating medium flows through the heating flow path, the heating medium acts on the heater, but the vibration of the heater is suppressed by the gap between the heater and the bottomed hole, and both ends of the heater are fixed. Compared to the case, the heater mounting part and the like are less likely to be damaged, and the durability is improved.
[0007]
The heater is preferably an electric heater, and a wiring for supplying electric power to the electric heater is taken out from the one end fixed side of the heater.
This makes it possible to adjust the heating temperature by controlling the power supplied to the heater, and because the wiring to the electric heater is performed on the fixed flange side, the wiring of each heater can be taken out from one side at a time It becomes.
The heater is preferably fixed to the side surface of the hot plate main body by a flange portion provided at one end portion side portion of the heater that protrudes from the hole of the hot plate main body. In this fixing, a seal packing is sandwiched between the flange portion and the side surface of the hot plate main body.
Thus, one end of the heater can be fixed while reliably preventing leakage of the heat medium.
The heating channel preferably has a sectional area of the heating channel substantially equal to the sectional area of the inlet and outlet.
Thereby, the flow velocity in the hot plate of the heat medium becomes constant, the surface heat transfer coefficient becomes constant, and the hot plate can be kept in a stable temperature distribution.
Preferably, the heating channel is configured by arranging adjacent heating channels in parallel, and the upstream heating medium is divided to flow from the heating channels arranged in parallel in the same direction and then merged downstream of the heating channels. Like that. In this case, desirably, the total cross-sectional area of the heating channels arranged in parallel is set to be approximately equal to the cross-sectional areas of the inlet and the outlet.
As a result, when the heating area of the hot plate is large, it is necessary to provide a large number of heating flow paths. However, the upstream heating medium is branched, adjacent heating flow paths are arranged in parallel and flow in the same direction, and merged downstream of this. Since it was made to do, compared with the case where the heating flow path is arranged in series one by one, distribution resistance can be made small. In addition, the flow rate of the heat medium in the hot plate is constant, the surface heat transfer coefficient is also constant, and the hot plate can be maintained in a stable temperature distribution.
The heating flow path is configured by alternately arranging a heating flow path in which a heat medium flows from one end side to the other end side and a heating flow path in which the heat medium flows from the other end side to the one end side.
Thereby, it becomes possible to suppress that temperature differs with each part of a hot plate with a heat medium.
Further, the press device is preferably configured by disposing the hot plate configured as described above between a pair of pressure platens of the press device. In this case, the hot plate may be directly attached to the pressure platen, or may be arranged between the pressure platens without being directly attached to the pressure platen and moved by the pressure platen.
Thereby, it becomes possible to heat and pressurize between hot plates having the above characteristics.
In addition, the press device may preferably have a multiple arrangement in which at least one or more hot plates are further arranged between the hot plates provided on the pressure platen, regardless of which type of press device is used.
This makes it possible to heat and press a large number of workpieces at a time with the workpieces arranged in multiple layers.
[0008]
Embodiment
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
FIG. 1 shows the entire press apparatus 1. In the figure, a press apparatus 1 has a fixed surface plate 3 fixed to an upper part of a frame 2 and a movable surface plate 4 provided below the fixed surface plate 3. The movable surface plate 4 can be moved up and down by a hydraulic cylinder 5. The hydraulic cylinder 5 is connected to a hydraulic power source 7 such as a hydraulic pump through a hydraulic pipe 6, and oil is supplied / discharged by a switching valve 17 provided in the middle of the hydraulic pipe 6. The operation of the switching valve 17 and the hydraulic pressure source 7 is controlled by the control unit 8. In the figure, these control wires and the like are omitted.
In the press apparatus 1, the upper hot plate 10 is attached to the lower surface of the fixed surface plate 3 via the heat insulating material 9, and the lower heat plate 12 is attached to the upper surface of the movable surface plate 4 via the heat insulating material 11. It has been.
[0009]
FIG. 2 shows a detailed structural section of a hot plate connected to the hydraulic circuit. FIG. 3 is a side view of the cross section of the hot plate. In addition, although this hot plate differs in a pressing direction etc. by an upper side hot plate and a lower side hot plate, both are the substantially the same structures.
As shown in FIG. 2, the rectangular parallelepiped hot plate main body 13 is formed with six through holes 14A to 14F parallel to one side at predetermined intervals, and positions on both ends of the through holes 14A to 14F. Thus, connecting through holes 15A and 15B orthogonal to the through holes 14A to 14F are formed. Accordingly, the through holes 14A to 14F communicate with each other at both end portions via the connecting through holes 15A and 15B.
In addition, electric heaters 16A to 16F having a diameter d smaller than these through-hole diameters D are inserted into the through-holes 14A to 14F, respectively, and a heating flow path 28A is formed in a gap between the through-hole inner wall and the heater outer peripheral portion. ~ 28F is formed so that oil as a heating medium flows.
Here, the cross-sectional areas of the inlet 26, the outlet 27, and the communication through holes 15A and 15B are the same. The cross-sectional areas of the heating channels 28A to 28F are set so as to be substantially equal to the cross-sectional areas of the inlet 26, the outlet 27, and the connecting through holes 15A and 15B, but in the figure, the connecting through holes 15A and 15B are set. It is drawn smaller than etc.
[0010]
Next, the attachment structure of the electric heater to the hot plate body is shown in FIGS. 4 and 5 show the attachment structure portion of the electric heater 16C as a representative because the attachment structure of each electric heater is substantially the same.
In the figure, a rectangular flange portion 18C is provided on one end side of the electric heater 16C, and this flange portion 18c is attached to one end side surface of the hot plate main body 13 with four bolts 21A to 21D. The electric heater 16C is fixed to the hot plate body 13. In fixing the flange portion 18C, as shown in FIG. 4, a seal packing 20C is inserted into an annular groove 19C formed on the mounting surface of the flange portion 18C, and the seal packing 20C is connected to the hot plate main body 13 and the seal plate 20C. Oil leakage from the through hole 14 C is prevented by maintaining a pressure-bonded state between the flange portions 18 C.
As shown in FIGS. 2 to 5, wirings 22 A to 22 F are respectively taken out from one end portions of the heaters 16 A to 16 F that protrude outward from the flange portions 18 A to 18 F and are connected to the thyristor unit 35. Has been. The thyristor unit 35 is controlled by the control unit 8. The control unit 8 receives the temperature signal of the hot plate from the temperature sensor 34 attached to the hot plate main body 13 and transmits a necessary power signal to the thyristor unit 35 based on this signal, so that the thyristor unit 35 receives the power signal. The thyristor output is feedback-controlled based on the hot plate temperature to keep the temperature of the electric heaters 16A to 16F within the optimum range.
Here, since the diameters of the through holes 14A to 14F are sufficiently larger than the diameters of the electric heaters 16A to 16F, the electric heaters 16A to 16F can be easily inserted from the one end side openings of the through holes 14A to 14F at the time of assembly. Even after assembly, the electric heaters 16A to 16F do not interfere with the inner wall of the through hole due to the flow of oil.
[0011]
On the other hand, cylindrical support members 23A to 23F in which bottomed holes 24A to 24F are formed are welded and fixed to the other end side of the through holes 14A to 14F of the hot plate main body 13 in a liquid-tight manner. Then, the other end portions of the electric heaters 14A to 14F are loosely fitted in these bottomed holes 24A to 24F so as to have a gap in the radial direction and the axial direction.
In this case, the sectional area of the gap between the electric heaters 16A to 16F and the bottomed holes 24A to 24F is made smaller than the sectional area of the heating flow paths 28A to 28F. That is, as the electric heaters 16A to 16F, when using a commonly used one having an outer diameter of 15 mm and a length of about 900 mm, or an outer diameter of 17.5 mm and a length of about 900 mm to 1300 mm, the inner diameter of the bottomed holes 24A to 24F Is D, and the outer diameters of the electric heaters 16A to 16F are d. When the electric heaters 16A to 16F are in steady operation, the thermal expansion of the electric heaters 16A to 16F is stable (of course, the bottomed holes are also thermally expanded at this time). The radial direction difference (Dd) between the outer peripheral portions of the electric heaters 16A to 16F and the bottomed holes 24A to 24F is set to about 0.2 mm to 0.4 mm.
In other words, the gap is set such that when the electric heaters 16A to 16F and the like are at room temperature, the radial direction difference (Dd) is such that the inner diameter of the bottomed holes 24A to 24F and the electric heaters 16A to 16F This means that the difference between the thermal expansion difference in the radial direction with respect to the outer diameter of 16F is the size obtained by adding the set difference of 0.2 mm to 0.4 mm.
In the above case, the flow rate of the heat medium in the heating flow path is set to, for example, about 3 m / second in order to suppress the temperature variation of the hot plate by shortening the time for oil to pass through the hot plate.
For the sake of clarity in the drawing, the size of the gap is exaggerated (in FIG. 4, only the electric heater 16C is shown in the state of thermal expansion as a solid line, and the state of non-thermal expansion is shown as a two-dot chain line). is there.
In addition to the gap in the radial direction, the radial direction is also present between the bottom of the bottomed holes 24A to 24F and the other end of the electric heaters 16A to 16F even in the state of thermal expansion during normal operation. It is set so that an axial gap larger than that of the gap always occurs.
[0012]
In the hot plate main body 13, the electric heaters 16 A to 16 F are inserted into the through holes 14 A to 14 F as described above to form heating channels 28 A to 28 F, and on one end side (lower side in FIG. 2). Both ends of the positioned communication through hole 15A are left open. In FIG. 2, the right end opening is the oil inlet 26, and the left end opening is the oil outlet 27.
In addition, columnar blocking members 25A to 25G are connected to one end side (the lower side in FIG. 2) and the other end side of the connecting through holes 15A and 15B connecting the adjacent through holes 14A to 14F. (The upper side in FIG. 2) is welded and closed so that every second line is placed. As a result, the through holes 14A to 14F are arranged in series in this order, and the adjacent through holes 14A to 14F, and thus the heating channels 28A to 28F, are connected to the connecting through hole 15A on one end side and the other end side. The connection through holes 15B are alternately connected.
Therefore, the oil supplied from the inlet 26 is the heating flow path 28A (from one end side to the other end side), the connecting through path 15B on the other end side, the adjacent heating flow path 28B (from the other end side to the one end side), One end side communication through hole 15A, adjacent heating flow path 28C (from one end side to the other end side), the other end side communication through hole 15B, adjacent heating flow path 28D (from the other end side to one end side), one end 15 A of side connection through holes, heating flow path 28E (from one end side to the other end side), the connection through hole 15B on the other end side, and adjacent heating flow path 28F (from one end side to the other end side) are meandered in this order. Finally, it is discharged from the outlet 27.
[0013]
The hot plate main body 13 connects a discharge port of a hydraulic pump 30 driven by an electric motor 38 through a hydraulic pipe 29 to an inlet 26, and connects a hydraulic pipe 29 to an outlet 27 to suck in the hydraulic pump 30. By connecting to the mouth, oil can be supplied and circulated. A thermal expansion adjusting tank 39 is connected upstream of the suction port of the hydraulic pump 30 so that a change in volume due to thermal expansion of oil in the hydraulic circuit can be adjusted. Further, a branch pipe 32 that branches from the middle of the hydraulic pipe 29 connecting the outlet 27 of the hot plate main body and the hydraulic pump 30 is provided, and goes to the upstream side of the hydraulic pump 30 of the hydraulic pipe 29 via the oil cooler 33 in the branch pipe 32. It is supposed to join. 33a is an oil inlet of the oil cooler 33, 33b is an oil outlet, 33c is a cooling water outlet, and 33d is a cooling water inlet. The branch portion is provided with a switching valve 31 (three-way valve), and oil discharged from the outlet 27 returns directly to the hydraulic pump 30 through the hydraulic pipe 29 or flows to the branch pipe 32 and flows into the oil cooler 33. It is possible to switch to return to the hydraulic pump 30 after being cooled at.
When the temperature detected by the temperature sensor 34 becomes higher than a predetermined value, the control unit 8 opens the branch pipe 32 and feeds the oil discharged from the outlet 27 to the oil cooler 33 to cool it. It is determined that the oil from the outlet 27 is prevented from flowing into the branch pipe 32 and returned directly to the hydraulic pump 30. A control signal based on the determination result is sent to the switching valve 31 so that the oil flow can be switched by the switching valve 31.
In this case, the predetermined value may be provided with a hysteresis between temperatures at which opening / closing of the switching valve 31 is determined.
The hydraulic circuit and the control circuit are common to the upper hot plate 10 side and the lower hot plate 12 side as shown in FIG. 1, and the feedback control is performed by detecting the temperature of the upper hot plate 10. However, the temperature of the lower heat plate 12 may be detected, or the temperature may be detected for each of the heat plates 10 and 12, and separate hydraulic circuits and control circuits may be provided.
[0014]
Next, the operation of the press apparatus will be described.
When the press device 1 is started, the hydraulic pump 30 starts to supply oil to the hot plates 10 and 11. At the same time, electric power is supplied to the electric heaters 16A to 16F from the thyristor unit 35 to start heating the oil in the heating passages 28A to 28F in the hot plates 10 and 11. As a result, the heated oil transfers heat to the hot plate body 13 and raises the temperature of the hot plates 10 and 11 as a whole. At this time, since the temperature detected by the temperature sensor 34 is equal to or lower than a predetermined value, the switching valve 31 closes the branch pipe 32 and directly sucks the oil discharged from the outlets 27 of the hot plates 10 and 11 into the hydraulic pump 30. Again, it is sent to the hot plates 10 and 11 for circulation.
The heating by the electric heaters 16A to 16F is continued until the hot plates 10 and 11 reach the target temperature. When the temperature of the hot plate becomes higher than a predetermined value, the control unit 8 reduces or stops the amount of power supplied from the thyristor unit 35 to the electric heaters 16A to 16F, and the switching valve 31 allows the branch pipe 32 to be connected. The hot plate temperature is maintained at the target temperature so that the temperature of the hot plates 10 and 11 does not become excessive, for example, by cooling the oil with the opening oil cooler 33.
[0015]
With the temperature rise of the heat plates 10 and 11 and the electric heaters 16A to 16F due to the heating, the bottomed holes 24A to 24F and the electric heaters 16A to 16F of the heat plates 10 and 11 are thermally expanded to have their axial dimensions. Although the outer diameter size increases, the expansion becomes stable and almost constant at the time of steady operation where the temperature is stable.
In this case, the axial gaps between the ends of the other end portions of the electric heaters 16A to 16F and the bottom portions 24Aa to 24Fa of the bottomed holes of the support members 23A to 23F are the electric heaters 16A to 16F when the thermal expansion is stabilized by heating. Since the size is set so as to allow for sufficient thermal expansion in the axial direction, they do not come into contact with each other and are not damaged.
Also, the radial gap between the inner diameter of the bottomed holes 23A to 23F and the outer diameter of the other end of the electric heaters 16A to 16F is in a state in which a minute gap is secured even when the thermal expansion is stabilized. Even if oil flows in the heating channels 28A to 28F, the vibrations of the electric heaters 16A to 16F can be suppressed as compared with the case where both ends of the electric heater are fixed.
According to the experiments of the present inventors, the electric heaters 16A to 16F have a commonly used outer diameter of 15 mm and a length of about 900 mm, or an outer diameter of 17.5 mm and a length of about 900 mm to 1300 mm, and the flow rate of the heat medium is 3 m. In the case of about / sec, the durability was best when the bottomed hole inner diameter D, the heater outer diameter d, and the gap difference (Dd) were about 0.2 mm to 0.4 mm.
On the other hand, in heating the hot plate, since the cross-sectional areas of the heating channels 28A to 28F are set substantially equal to the inlet and outlet, the flow velocity in the hot plate is constant and the surface heat transfer is also constant. The hot plate can be maintained in a more stable temperature distribution.
[0016]
FIG. 6 shows another embodiment of the hot plate, in which the heating / pressurizing area of the hot plate is further increased to further increase the number of electric heaters.
In this case, as shown in the embodiment of FIG. 2, it is not preferable to arrange each heating channel in series one by one because the flow resistance increases, which is not preferable. In this embodiment, a plurality of adjacent heating channels are arranged in parallel. The parallel heating channels are arranged in series as a unit.
That is, in the figure, the hot plate main body 13 is formed with bottomed holes 14a and 14j whose other ends are closed at both ends, and eight through holes 14a to 14h are provided therebetween. These bottomed holes and through-holes 14b to 14i have one connecting through-hole 15A and 15B on one end side (lower side in FIG. 6) and the other end side (upper side in FIG. 6), respectively. Provided.
In the communication through-hole 15A on the one end side, blocking members 25a and 25i are respectively provided at the openings at both ends of the communication passage 15A, and between the through-holes 14a to 14b, between the through-holes 14e to 14f, and through-holes 14i to 14i. Cylindrical blocking members 25c, 25e, and 25g are fixed by welding in a liquid-tight manner to the portion between 14j.
Similarly, even in the communication through hole 15B on the other end side, the blocking members 25b and 25h are respectively provided between the through holes 14c to 14d and between the through holes 14g to 14h in the openings at both ends of the communication through hole 15B. The cylindrical blocking members 25d and 25f are fixed by welding in a liquid-tight manner.
Note that the openings on the one end side of the bottomed holes 14a and 14j remain open and are referred to as an inlet 26 and an outlet 27, respectively.
[0017]
A total of eight electric heaters 16A to 16H are inserted into the eight through holes 14b to 14i one by one, and a heating medium is heated in a gap between the inner wall of these through holes and the outer periphery of the electric heater. The flow paths 28a to 28h are configured.
Here, the inlet 26, the outlet 27, the bottomed holes 14a and 14j, and the communication through holes 15A and 15B are set so that the cross-sectional area thereof is approximately twice the cross-sectional area of the heating flow paths 28a to 28h. deep.
The electric heaters 16A to 16H are fixed by the flange portions 18A to 18H fixed to the end portions on one end side, with the seal packing sandwiched between the side surfaces on the one end side of the hot plate 13, and the other end side end portion is a through hole. It is inserted into the bottomed holes 24A to 24H of the support members 23A to 23H that are liquid-tightly welded and fixed to the other end portions of 14b to 14i. The other ends of the electric heaters 16A to 16H and the bottomed holes 24A to 24H are inserted with gaps in the radial direction and the axial direction. These gaps have a radial direction difference of about 0.2 mm to 0.4 mm during steady operation with stable thermal expansion as in the embodiment of FIGS. 2 and 4, and the gaps are larger in the axial direction. It is set to be possible.
[0018]
Therefore, in the hydraulic circuit of the hot plate configured as described above, the oil flowing in from the opening of the bottomed hole 14a flows to the other end side and goes to the communication through hole 15B on the other end side. After flowing through the two heating channels arranged in parallel with each other between the communication passages 15A on one end side, the flow passes from the communication through hole 15B on the other end side to the bottomed hole 14j and flows out from the outlet 27.
That is, the oil flowing from the large-diameter bottomed hole 14a through the inlet 26 is divided through the other end side connection through hole 15B and transferred to the other end side of the two heating flow paths 28a and 28b. While being heated by the heaters 16A and 16B, the heating flow paths 28a and 28b are directed to one end side, merged at the communication through hole 15A on one end side, and then diverted again to flow into the two heating flow paths 28c and 28d. , While being heated at 16D, flows from one end side to the other end side of the heating channels 28c, 28d. Similarly, the oil arriving at the other end side joins at the communication through-hole 15B, then diverts again to the two heating flow paths 28e, 28f, and flows while being heated from one end side to the other end side, After joining at the communication through-hole 15A on one end side, the flow is divided again and flows through the two heating channels 28g and 28h while being heated from one end side to the other end side. The oil is transferred to the bottomed hole 14j via the connection through hole 15B on the other end side of the heating flow paths 28g and 28h, and is discharged from the outlet 27 of the hot plate main body 13.
[0019]
In this embodiment, the number of electric heaters is increased from that of the first embodiment so as to correspond to a large hot plate area, but the cross-sectional area is the communication through holes 15A, 15B, the inlet 26, the outlet. Since two heating channels that are only about half as large as 27 are arranged in parallel and flow between the communication through holes 15A and 15B, the heating channels are flowed in comparison with the case where each heating channel is arranged in series. Road resistance decreases. Also, in heating the hot plate, the total cross-sectional area of the two heating channels arranged in parallel is set to be approximately equal to the cross-sectional area of the inlet and outlet, so the flow velocity in the hot plate is constant and the surface heat Transmission is also constant and the hot plate can be kept in a more stable temperature distribution.
In addition, the amount of oil flowing through each heating channel is approximately 2 with respect to the sectional area of the inlet 26, outlet 27, bottomed holes 14a and 14j, and connecting through holes 15A and 15B. Since it is set to be 1 / fold, the amount of heat medium in the hot plate can be reduced compared with the case where the cross-sectional area of the heating channel is the same as the cross-sectional area of the inlet 26, outlet 27, etc. Running costs during heating can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an entire press apparatus according to the present invention.
FIG. 2 is a front sectional view of a hot plate according to the present invention.
FIG. 3 is a partial cross-sectional side view of the hot plate as viewed from III-III in FIG. 2;
4 is an enlarged cross-sectional view of the electric heater of FIG. 2 and its mounting portion. FIG.
5 is a side view of a flange mounting portion of the electric heater of FIG. 4. FIG.
FIG. 6 is a front cross-sectional view of a hot plate according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Press apparatus 3 Fixed surface plate 4 Movable surface plate 7 Hydraulic source 8 Control unit 10 Upper hot plate 12 Lower hot plate 13 Hot plate main body 14A-14G, 14b-14i Through-hole (hole)
15A, 15B Connecting through holes 16A-16H Electric heaters 18A-18H Flange 19C Annular groove 20C Seal packing 24A-24H Bottomed holes 25A-25G, 25a-25i Closing member 26 Inlet 27 Outlets 28A-28F, 28a-28h Heating flow Passage 30 Hydraulic pump 33 Oil cooler 34 Oil temperature sensor 35 Thyristor unit

Claims

By inserting a heater into a hole provided in the inside of the hot plate main body, a heating channel having an annular cross section is formed by a gap formed in the radial direction between the outer peripheral portion of the heater and the inner peripheral wall of the hole, and the hot plate In the hot plate of the press apparatus in which the heat medium introduced from the inlet of the main body is discharged from the outlet via the heating channel,
One end portion of the heater is fixed to one side surface of the hot plate body, and the other end portion of the heater is spaced in a radial direction and an axial direction in a bottomed hole provided on the other side surface of the hot plate body. the insert has a thermal plate of the pressing device, characterized in that, which is to suppress the vibration of the heater due to heat medium flowing along the heating channel in the axial direction of the heater.

It said radial gap, the hot plate of the press device according to claim 1 to the cross-sectional area in the radial direction of the gap is made smaller than the cross-sectional area of the radial direction of the heating channel, characterized by.

The said hot plate is arrange | positioned between a pair of press surface plate of the said press apparatus, The hot plate of the press apparatus as described in any one of Claim 1 or 2 characterized by the above-mentioned.

The heater is an electric heater, to a wiring for supplying electric power to the electric heater was taken out from the one end fixed side of the heater, to any one of claims 1 to 3, characterized in The hot plate of the press apparatus as described.

One end side of the heater is fixed to a side surface of the hot plate main body with a seal packing sandwiched by a flange portion provided at an end protruding from the hole of the hot plate main body. The hot plate of the press apparatus according to any one of claims 1 to 4.

The heating channel is described the cross-sectional area of the radial, in any one of claims 1 to 5, wherein the inlet and that was substantially equal to the cross-sectional area of the radial direction of said outlet, characterized by Hot plate of press machine.

The heating channel is configured such that adjacent heating channels are arranged in parallel, and the upstream heating medium is divided to flow in the same direction from the heating channels arranged in parallel and then merged downstream thereof. The hot platen of the press device according to any one of claims 1 to 5 , wherein

The hot plate of the press apparatus according to claim 7 , wherein the heating flow path has a radial sectional area smaller than a radial sectional area of the inlet and outlet.

The sum of the radial cross-sectional areas of the heating channels arranged in parallel through which the divided heat medium flows is set to be approximately equal to the radial cross-sectional areas of the inlet and the outlet, The hot plate of the press apparatus according to claim 8 .

The heating flow path is configured by alternately and meanderingly arranging a heating flow path for flowing a heat medium from one end side to the other end side and a heating flow path for flowing a heat medium from the other end side to the one end side. The hot plate of the press device according to any one of claims 1 to 9.

In a press apparatus in which a hot plate is provided on a pair of upper and lower surface plates, an outer peripheral portion of the heater and an inner peripheral wall of the hole are inserted by inserting a heater into a hole provided in the hot plate main body. And forming a heating passage having an annular cross section by a gap that can be formed in the radial direction, and letting the heat medium introduced from the inlet of the hot plate main body be discharged from the outlet through the heating passage, and One end of the heater is fixed to one side of the hot plate main body, and the other end of the heater is provided with a gap in a radial direction and an axial direction in a bottomed hole provided on the other side of the hot plate main body. It has been inserted, that the heating channel is configured so as to suppress vibration of the heater due to heat medium flowing along the axial direction of the heater, a press apparatus according to claim.