JP4065069B2 - Method and apparatus for thermoforming press working - Google Patents

Method and apparatus for thermoforming press working Download PDF

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Publication number
JP4065069B2
JP4065069B2 JP36925298A JP36925298A JP4065069B2 JP 4065069 B2 JP4065069 B2 JP 4065069B2 JP 36925298 A JP36925298 A JP 36925298A JP 36925298 A JP36925298 A JP 36925298A JP 4065069 B2 JP4065069 B2 JP 4065069B2
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plate
cooling
heating
temperature
workpiece
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JP2000190099A (en
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静明 岡崎
容行 市川
一博 千葉
吉智 渡辺
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Kitagawa Seiki KK
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • B30B15/064—Press plates with heating or cooling means

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  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、熱可塑性樹脂を接着剤として用いる被加工物の熱成型を行うプレス加工の方法及び装置に関する。
【０００２】
【従来の技術】
熱可塑性樹脂を接着剤として用いる被加工物の熱成型を行うプレス加工においては、
（ア）熱間プレス
（イ）冷間プレス
の２工程で被加工物を成型する。
【０００３】
（ア）熱間プレス
熱間プレスは、被加工物を加熱しながら押圧する上下一対の熱盤間で行われる。
まず、被加工物をベルトコンベア上に乗せ、下部の熱盤上に移送する。そこでベルトコンベアを停止し、上方から別の熱盤を降下させて、被加工物を上部の熱盤と下部の熱盤の間で押圧しながら、被加工物全体の温度が接着剤の軟化温度以上になるまで加熱する。被加工物の温度が十分上がった時点で、上部の熱盤を上昇させ、熱間プレス工程が完了する。
【０００４】
（イ）冷間プレス
冷間プレスは、被加工物を冷却しながら押圧する上下一対の冷却盤間で行われる。
熱間プレス工程を終了した被加工物は前記ベルトコンベアで下流の冷却盤上へ移送される。被加工物が下流の冷却盤上に置かれた時点で、ベルトコンベアを停止し、上方から別の冷却盤を降下させる。被加工物を上部の冷却盤と下部の冷却盤の間で押圧しながら、被加工物全体の温度が接着剤の硬化温度以下になるまで冷却する。被加工物の温度が十分下がった時点で、上部の冷却盤を上昇させ、熱成型が完了する。
【０００５】
【発明が解決しようとする課題】
従来の熱成型プレス加工法では、加工中の被加工物上面と下面の温度差の為に、製品に寸法誤差を生じていた。
図３は、熱成型プレス装置の動作と被加工物に対する熱の授受の時間的関連を示した図である。
同図に示すように、被加工物下面は被加工物が下部の熱盤に載せられた時点（装置の動作状態１０１と１０２の間）で加熱され始め、被加工物が下部の熱盤から取り去られるまで（同１０７と１０８の間）加熱される。それに対し、被加工物上面が加熱されるのは、熱間プレス開始（同１０４）から熱間プレス完了（同１０５）までであり、下面側の加熱時間の方が長い。従って、上部の熱盤と下部の熱盤が同じ温度であれば、被加工物下面の方が熱盤との接触時間が長いので、冷却プレス移行時には、被加工物下面の方が上面よりも高い温度になる。
【０００６】
また冷間プレス工程では、被加工物下面は被加工物が下部の冷却盤に載せられた時点（装置の動作状態１０７と１０８の間）で冷却され始めるため、被加工物上面よりも先行して冷却され始める（被加工物上面の冷却開始点は、装置の動作状態１１０）。然しながら、被加工物下面は熱間プレス工程で上面よりも高い温度となっており、かつ被加工物下面と下部冷却盤の間のベルトコンベアも熱容量を持っているため、冷間プレス工程中も下面の方が上面より温度が相対的に高い状態を維持したまま冷却される。
【０００７】
上記の被加工物上面と下面の熱成型プレス加工中の温度変化を表したグラフが図４である。
同図中A1部で示されるように、被加工物上面の方が下面よりも先に接着剤の硬化温度まで冷却され、上面の接着剤が硬化を開始する。
更に、被加工物はプレスされながら冷却され、上面・下面が共に硬化温度以下に達した後に、冷却プレス盤から解放されるが、このとき、被加工物は上面と下面の相対温度差を依然として残したままである（図中A2部）。また、このとき、上下両面の接着剤は完全に硬化していない。
上下両面の接着剤が完全に硬化するのは、被加工物全体が常温付近まで冷却されたときであるが、冷間プレス完了後の自然冷却による被加工物の収縮量は、冷間プレス完了時の相対温度差からして、被加工物上面と下面とで異なるものとなり、この過程で被加工物は次第に反りを発生する。
従来の熱成型プレス装置では、この反りによって製品の寸法誤差が生じるという問題点があった。
【０００８】
【課題を解決するための手段】
本発明は、熱可塑性樹脂を接着剤として用いる被加工物の熱成型を行うものに於いて、被加工物が上下一対の熱盤の間で熱盤に押圧され加熱された後に上下一対の冷却盤の間で冷却盤に押圧され冷却され、上部の冷却盤と下部の冷却盤の冷却温度を異なる温度にして被加工物上面と下面が接着剤硬化温度に到達する時点をほぼ等しくする、ことを特徴とする熱成型プレス加工の方法である。
更に、上部の熱盤と下部の熱盤の加熱温度を異なる温度にして被加工物上面と下面が接着剤軟化温度に到達する時点をほぼ等しくする方法をとれば、より効果的である。
【０００９】
上記発明の方法は、熱可塑性樹脂を接着剤として用いる被加工物と、上下一対の熱盤と、上下一対の冷却盤と、熱盤を加熱する加熱手段と、冷却盤を冷却し上部の冷却盤の温度と下部の冷却盤の温度を異なる温度に設定できる冷却手段と、被加工物を上部の熱盤と下部の熱盤との間で押圧する押圧手段と、被加工物を上部の冷却盤と下部の冷却盤との間で押圧する押圧手段と、被加工物を装置外から下部の熱盤上に移送し、下部の熱盤上から下部の冷却盤上に移送し、下部の冷却盤上から装置外に移送する移送手段、から構成される熱成型プレス加工装置で実現可能である。
更に、上記熱成型プレス加工装置の加熱手段が、上部の熱盤と下部の熱盤の温度を異なる温度に設定できるものであることが好ましい。
また、上部の冷却盤の温度と下部の冷却盤の温度を異なる温度に設定できるよう冷却手段を制御する冷却制御装置を備えるよう構成することもできる。
同様に、上部の熱盤の温度と下部の熱盤の温度を異なる温度に設定できるよう加熱手段を制御する加熱制御装置を備える構成としても良い。
【００１０】
【発明の実施の形態】
この説明では、図１に示す鋼製ハニカム構造の本体に鋼製外板を熱可塑性樹脂の接着剤で接着する鋼製ドアーを成型する場合を想定する。
図１は、被加工物となる鋼製ドアーの分解図である。
鋼製ドアー１は、ハニカムコア２aに枠２bを取り付けたコア２を、上下両面から表面鋼板３で挟み、コア２と表面鋼板３の間に塗布された接着剤で両部材を接着して製造される。
【００１１】
図２は本発明の実施形態である熱成型装置の構成を示す図である。
被加工物（ここでは前記鋼製ドアー）１は耐熱ベルトコンベア４によって下部熱盤６の上に載せられる。下部熱盤６は加熱手段７bによって加熱されており、高温を保っている。加熱手段７bは下部熱盤６が所定の温度を保つよう、加熱制御装置８によって制御されている。この時点で下部熱盤６は被加工物１の下面を接触伝熱により加熱し始めることになる。次に、被加工物１の上方から上部熱盤５が押し付けられる。上部熱盤５は装置筐体１０に固定されたシリンダ９により昇降可能となっており、また加熱手段７aにより加熱され高温を保っている。加熱手段７aは上部熱盤５が所定の温度を保つよう、加熱制御装置８によって制御されている。この時点で上部熱盤５は被加工物１の上面を接触伝熱により加熱し始める。この状態を保って、 被加工物１は、ある一定時間上下の熱盤から加熱圧縮される。
【００１２】
被加工物１中の接着剤が十分に軟化した状態となったところで、上部熱盤５が被加工物１から離され、再びベルトコンベア４が稼働し、被加工物１を移送し始める。
被加工物１は、ベルトコンベア４によって下部冷却盤１２の上に載せられる。下部冷却盤１２は冷却手段１３bによって冷却されている。冷却手段１３bは下部冷却盤 １２が所定の温度を保つよう、冷却制御装置１４によって制御されている。この時点で下部冷却盤１２は被加工物１の下面を接触伝熱により冷却し始める。次に、被加工物１の上方から上部冷却盤１１が押し付けられる。上部冷却盤１１はシリンダ１５により昇降可能となっており、また冷却手段１３aによって冷却されている。冷却手段１３aは、上部冷却盤１１が所定の温度を保つよう、冷却制御装置１４で制御されている。ここで上部冷却盤１１は被加工物１の上面を接触伝熱により冷却し始める。この状態がある一定時間維持され、被加工物１は、上下の冷却盤から冷却される。
被加工物中の接着剤が十分に硬化したところで、上部冷却盤１１は被加工物１から離され、再びベルトコンベア４が稼働し、被加工物１をプレス装置外部まで移送して、熱成型プレス加工が完了する。
【００１３】
上記説明中の加熱手段、冷却手段はそれぞれ上部と下部の熱盤温度、上部と下部の冷却盤温度を個別に（異なる温度に）制御できるようになっており、この点について説明を補足する。
図６は、加熱制御装置８の構成図である。
加熱制御装置８は、上部熱盤温度センサー８aと下部熱盤温度センサー８bを有しており、それぞれ上部熱盤５と下部熱盤６の温度を検出する。加熱制御回路８cは、検出された熱盤の温度に基づき、各熱盤がそれぞれの目標温度を保つよう、上部熱盤加熱手段７aと下部熱盤加熱手段７bを個別に制御する。
このとき、熱盤加熱手段７aと７bは、二つの独立した加熱手段であっても良いし、一つの加熱源から上部熱盤への加熱量と下部熱盤への加熱量を独立して調整できる加熱手段であっても良い。
また、熱盤加熱手段７aと７b自身が、各熱盤の温度を個別に制御し目標温度に保つことが出来るものであれば、加熱制御装置８は不要である。
【００１４】
図７は、冷却制御装置１４の構成図である。
冷却制御回路１４cは、上部冷却盤温度センサー１４aと下部冷却盤温度センサー１４bで検出された冷却盤の温度に基づき、各冷却盤が目標温度を保つよう、上部冷却盤冷却手段１３aと下部冷却盤冷却手段１３bを個別に制御する。
冷却盤冷却手段１３aと１３bは、二つの独立した冷却手段でも、一つの冷却源を持ち二つの冷却盤の冷却量を独立して調整できるものであっても良い。
また、冷却盤冷却手段１３aと１３b自身が、各冷却盤の温度を個別に制御し目標温度に保つことが出来るものであれば、冷却制御装置１４は不要である。
【００１５】
図５は、本発明の方法による熱成型プレス加工時の被加工物上面と下面の温度変化を示したグラフである。
熱盤加熱手段７a、７bを個別に制御することで、上部熱盤５の温度は、下部熱盤６の温度よりも高く設定される。このように熱盤の温度を設定することで、被加工物上面は下面よりも遅れて加熱され始めるにもかかわらず、下面よりも速くその温度が上昇し、上面と下面はほぼ同時に接着剤軟化温度に到達する（図中B'部）。尚、本来本発明の目的を達するためには、接着剤軟化温度への到達時点をそろえる必要はないが、下記に示す冷間プレス工程における被加工物上面と下面の温度差を小さくする制御を容易にするために、このような上下の熱盤温度の制御を行う。
また、冷却盤冷却手段１３a、１３bを個別に制御することで、上部冷却盤１１の温度は、下部冷却盤１２の温度よりも低く設定される。このように冷却盤の温度を設定することで、被加工物上面は下面よりも遅れて冷却され始めるにもかかわらず、下面よりも速くその温度が低下し、上面と下面はほぼ同時に接着剤硬化温度に到達する（図中A1'部）。
【００１６】
このように、冷間プレス工程完了間際の、接着剤が硬化する時点を、被加工物上面と下面とでほぼ同じにしておくことで、冷間プレス完了時の被加工物上面と下面の温度をほぼ等しくすることが出来る（図中A2'部）。
従って、被加工物は、上面と下面の温度差が少ない状態で、冷間プレス完了後の硬化過程を完了することになり、反りの少ない製品を得ることができる。
ここで、各熱盤・冷却盤の設定温度は、あらかじめ熱間プレス、冷間プレス中の被加工物の反りがもっとも小さくなるよう、あらかじめ調整して決定される。本装置の稼働時には、上下の熱盤・冷却盤温度が該設定温度を保つように制御される。
【図面の簡単な説明】
【図１】は、実施例の説明で被加工物として想定した鋼製ドアーの分解図である。
【図２】は、本発明の実施形態である熱成型装置の構成を示す図である。
【図３】は、熱成型プレス加工装置の動作と、被加工物に対する熱の授受の時間的関連を示した図である。
【図４】は、従来の技術による熱成型プレス加工における、被加工物上面・下面の温度変化を模式的に示したグラフである。
【図５】は、本発明の方法による熱成型プレス加工における、被加工物上面・下面の温度変化を模式的に示したグラフである。
【図６】は、本発明の実施例における、加熱制御装置の構成図である。
【図７】は、本発明の実施例における、冷却制御装置の構成図である。
【符号の説明】
１ 被加工物（鋼製ドアー）
２a ハニカムコア
２b 枠
３ 表面鋼板
４ ベルトコンベア
５ 上部熱盤
６ 下部熱盤
７a 上部熱盤加熱手段
７b 下部熱盤加熱手段
８ 加熱制御装置
９ シリンダ
１０ 装置筐体
１１ 上部冷却盤
１２ 下部冷却盤
１３a 上部冷却盤冷却手段
１３b 下部冷却盤冷却手段
１４ 冷却制御装置
１５ シリンダ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press working method and apparatus for thermoforming a workpiece using a thermoplastic resin as an adhesive.
[0002]
[Prior art]
In the press processing that performs thermoforming of a workpiece using a thermoplastic resin as an adhesive,
(A) Hot press (A) The work piece is molded in two steps of cold press.
[0003]
(A) Hot pressing Hot pressing is performed between a pair of upper and lower hot plates that press while heating a workpiece.
First, the workpiece is placed on a belt conveyor and transferred onto a lower heating platen. Therefore, stop the belt conveyor, lower another hot platen from above, and press the work piece between the upper hot platen and the lower hot platen, while the temperature of the whole work piece is the softening temperature of the adhesive Heat until above. When the temperature of the workpiece is sufficiently raised, the upper hot platen is raised and the hot pressing process is completed.
[0004]
(A) Cold pressing Cold pressing is performed between a pair of upper and lower cooling plates that press while cooling the workpiece.
The workpiece after the hot pressing step is transferred onto the downstream cooling plate by the belt conveyor. When the workpiece is placed on the downstream cooling plate, the belt conveyor is stopped and another cooling plate is lowered from above. While the workpiece is pressed between the upper cooling plate and the lower cooling plate, the workpiece is cooled until the temperature of the entire workpiece is equal to or lower than the curing temperature of the adhesive. When the temperature of the workpiece is sufficiently lowered, the upper cooling plate is raised to complete the thermoforming.
[0005]
[Problems to be solved by the invention]
In the conventional thermoforming press processing method, a dimensional error has occurred in the product due to the temperature difference between the upper surface and the lower surface of the workpiece being processed.
FIG. 3 is a diagram showing the temporal relationship between the operation of the thermoforming press device and the transfer of heat to the workpiece.
As shown in the figure, the lower surface of the workpiece starts to be heated when the workpiece is placed on the lower heating platen (between the operating states 101 and 102 of the apparatus), and the workpiece is removed from the lower heating platen. Heat until removed (between 107 and 108). In contrast, the upper surface of the workpiece is heated from the start of hot pressing (104) to the completion of hot pressing (105), and the heating time on the lower surface is longer. Therefore, if the upper hot platen and the lower hot platen are at the same temperature, the lower surface of the work piece has a longer contact time with the hot platen, so that when the cooling press is transferred, the lower surface of the work piece is lower than the upper surface. High temperature.
[0006]
In the cold pressing process, the lower surface of the workpiece starts to cool when the workpiece is placed on the lower cooling plate (between the operation states 107 and 108 of the apparatus), and therefore precedes the upper surface of the workpiece. (The cooling start point on the upper surface of the workpiece is the operating state 110 of the apparatus). However, the lower surface of the workpiece has a higher temperature than the upper surface in the hot pressing process, and the belt conveyor between the lower surface of the workpiece and the lower cooling plate also has a heat capacity, so even during the cold pressing process The lower surface is cooled while maintaining a relatively higher temperature than the upper surface.
[0007]
FIG. 4 is a graph showing the temperature change during the thermoforming press processing of the workpiece upper and lower surfaces.
As indicated by A1 in the figure, the upper surface of the workpiece is cooled to the curing temperature of the adhesive before the lower surface, and the adhesive on the upper surface starts to cure.
Furthermore, the workpiece is cooled while being pressed, and after the upper surface and the lower surface both reach the curing temperature or less, they are released from the cooling press machine. At this time, the workpiece still has a relative temperature difference between the upper surface and the lower surface. It remains (A2 part in the figure). At this time, the adhesives on the upper and lower surfaces are not completely cured.
The adhesive on both the upper and lower surfaces is completely cured when the entire workpiece is cooled to near room temperature, but the amount of shrinkage of the workpiece due to natural cooling after the cold press is completed is the cold press completed. Due to the relative temperature difference at the time, the upper surface and the lower surface of the workpiece are different, and the workpiece gradually warps during this process.
The conventional thermoforming press apparatus has a problem that a dimensional error of the product occurs due to this warpage.
[0008]
[Means for Solving the Problems]
The present invention relates to a method for thermoforming a workpiece using a thermoplastic resin as an adhesive, and a pair of upper and lower coolings after the workpiece is pressed and heated between a pair of upper and lower hot plates. It is pressed by the cooling plate between the plates and cooled, and the cooling temperature of the upper cooling plate and the lower cooling plate is made different to make the time point when the upper and lower surfaces of the workpiece reach the adhesive curing temperature almost equal. This is a method of thermoforming press working.
Furthermore, it is more effective to adopt a method in which the heating temperature of the upper heating plate and the lower heating plate are set to different temperatures so that the time points when the upper surface and the lower surface of the workpiece reach the adhesive softening temperature are substantially equal.
[0009]
The method of the invention includes a workpiece using a thermoplastic resin as an adhesive, a pair of upper and lower heating plates, a pair of upper and lower cooling plates, a heating means for heating the heating plates, and cooling the cooling plate to cool the upper portion. The cooling means that can set the temperature of the board and the temperature of the lower cooling board to different temperatures, the pressing means that presses the workpiece between the upper heating board and the lower heating board, and the upper cooling of the workpiece The pressing means for pressing between the panel and the lower cooling panel, and the work piece is transferred from the outside of the apparatus to the lower heating panel, from the lower heating panel to the lower cooling panel, and the lower part is cooled. This can be realized by a thermoforming press working apparatus constituted by a transfer means for transferring the apparatus from the board to the outside of the apparatus.
Furthermore, it is preferable that the heating means of the thermoforming press working apparatus can set the temperature of the upper hot platen and the lower hot platen to different temperatures.
It is also possible to provide a cooling control device that controls the cooling means so that the temperature of the upper cooling plate and the temperature of the lower cooling plate can be set to different temperatures.
Similarly, it is good also as a structure provided with the heating control apparatus which controls a heating means so that the temperature of an upper heating board and the temperature of a lower heating board can be set to a different temperature.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In this description, it is assumed that a steel door is formed by bonding a steel outer plate to the main body of the steel honeycomb structure shown in FIG. 1 with a thermoplastic resin adhesive.
FIG. 1 is an exploded view of a steel door to be processed.
The steel door 1 is manufactured by sandwiching a core 2 with a frame 2b attached to a honeycomb core 2a from both upper and lower surfaces with a surface steel plate 3, and bonding both members with an adhesive applied between the core 2 and the surface steel plate 3. Is done.
[0011]
FIG. 2 is a diagram showing a configuration of a thermoforming apparatus according to an embodiment of the present invention.
A workpiece (here, the steel door) 1 is placed on a lower heating plate 6 by a heat-resistant belt conveyor 4. The lower heating plate 6 is heated by the heating means 7b, and keeps high temperature. The heating means 7b is controlled by the heating control device 8 so that the lower heating plate 6 maintains a predetermined temperature. At this time, the lower heating plate 6 starts to heat the lower surface of the workpiece 1 by contact heat transfer. Next, the upper heating platen 5 is pressed from above the workpiece 1. The upper heating platen 5 can be moved up and down by a cylinder 9 fixed to the apparatus housing 10, and is heated by the heating means 7a to maintain a high temperature. The heating means 7a is controlled by the heating control device 8 so that the upper heating platen 5 maintains a predetermined temperature. At this time, the upper heating platen 5 starts to heat the upper surface of the workpiece 1 by contact heat transfer. In this state, the workpiece 1 is heated and compressed from the upper and lower hot plates for a certain period of time.
[0012]
When the adhesive in the workpiece 1 is sufficiently softened, the upper heating platen 5 is separated from the workpiece 1, the belt conveyor 4 is operated again, and the workpiece 1 starts to be transferred.
The workpiece 1 is placed on the lower cooling plate 12 by the belt conveyor 4. The lower cooling board 12 is cooled by the cooling means 13b. The cooling means 13b is controlled by the cooling control device 14 so that the lower cooling panel 12 maintains a predetermined temperature. At this time, the lower cooling plate 12 starts cooling the lower surface of the workpiece 1 by contact heat transfer. Next, the upper cooling platen 11 is pressed from above the workpiece 1. The upper cooling board 11 can be moved up and down by a cylinder 15 and is cooled by a cooling means 13a. The cooling means 13a is controlled by the cooling control device 14 so that the upper cooling platen 11 maintains a predetermined temperature. Here, the upper cooling platen 11 starts to cool the upper surface of the workpiece 1 by contact heat transfer. This state is maintained for a certain time, and the workpiece 1 is cooled from the upper and lower cooling boards.
When the adhesive in the workpiece is sufficiently cured, the upper cooling platen 11 is separated from the workpiece 1, the belt conveyor 4 is operated again, the workpiece 1 is transferred to the outside of the press device, and thermoforming is performed. Press work is completed.
[0013]
The heating means and cooling means in the above description can individually control the upper and lower hot platen temperatures and the upper and lower cooling platen temperatures (to different temperatures), respectively.
FIG. 6 is a configuration diagram of the heating control device 8.
The heating control device 8 includes an upper hot platen temperature sensor 8a and a lower hot platen temperature sensor 8b, and detects the temperatures of the upper hot platen 5 and the lower hot platen 6, respectively. The heating control circuit 8c individually controls the upper heating plate heating means 7a and the lower heating plate heating means 7b so that each heating plate maintains the target temperature based on the detected temperature of the heating plate.
At this time, the heating plate heating means 7a and 7b may be two independent heating means, and the heating amount from one heating source to the upper heating plate and the heating amount to the lower heating plate are adjusted independently. The heating means which can be used may be sufficient.
Further, if the heating plate heating means 7a and 7b themselves can individually control the temperature of each heating plate and maintain the target temperature, the heating control device 8 is unnecessary.
[0014]
FIG. 7 is a configuration diagram of the cooling control device 14.
The cooling control circuit 14c includes an upper cooling plate cooling means 13a and a lower cooling plate so that each cooling plate maintains a target temperature based on the temperature of the cooling plate detected by the upper cooling plate temperature sensor 14a and the lower cooling plate temperature sensor 14b. The cooling means 13b is individually controlled.
The cooling panel cooling means 13a and 13b may be two independent cooling means or one having a single cooling source and capable of independently adjusting the cooling amount of the two cooling disks.
Further, if the cooling panel cooling means 13a and 13b themselves can individually control the temperature of each cooling panel and maintain the target temperature, the cooling control device 14 is unnecessary.
[0015]
FIG. 5 is a graph showing the temperature change of the upper surface and the lower surface of the workpiece during thermoforming press processing by the method of the present invention.
By controlling the heating platen heating means 7a and 7b individually, the temperature of the upper heating platen 5 is set higher than the temperature of the lower heating platen 6. By setting the temperature of the heating plate in this way, the upper surface of the workpiece starts to be heated later than the lower surface, but the temperature rises faster than the lower surface, and the upper surface and the lower surface soften the adhesive almost simultaneously. The temperature is reached (B 'in the figure). In order to achieve the purpose of the present invention, it is not necessary to align the time when the adhesive softening temperature is reached, but control to reduce the temperature difference between the upper surface and the lower surface of the workpiece in the cold pressing process shown below. In order to facilitate, the upper and lower hot platen temperatures are controlled.
Further, the temperature of the upper cooling plate 11 is set lower than the temperature of the lower cooling plate 12 by individually controlling the cooling plate cooling means 13a and 13b. By setting the temperature of the cooling board in this way, the upper surface of the work piece starts to cool later than the lower surface, but the temperature decreases faster than the lower surface, and the upper surface and the lower surface are cured almost simultaneously. The temperature is reached (A1 'in the figure).
[0016]
Thus, the temperature of the upper surface and the lower surface of the workpiece when the cold pressing is completed is made by making the time when the adhesive hardens immediately before the completion of the cold pressing process between the upper surface and the lower surface of the workpiece. Can be made almost equal (A2 'in the figure).
Therefore, the workpiece completes the curing process after the cold pressing is completed in a state where the temperature difference between the upper surface and the lower surface is small, and a product with less warpage can be obtained.
Here, the set temperature of each hot platen / cooling plate is determined by adjusting in advance so that the warpage of the workpiece during the hot press and cold press is minimized. During the operation of this apparatus, the upper and lower hot / cooling plate temperatures are controlled to maintain the set temperature.
[Brief description of the drawings]
FIG. 1 is an exploded view of a steel door assumed as a workpiece in the description of the embodiment.
FIG. 2 is a diagram showing a configuration of a thermoforming apparatus according to an embodiment of the present invention.
FIG. 3 is a diagram showing the temporal relationship between the operation of the thermoforming press working apparatus and the transfer of heat to the workpiece.
FIG. 4 is a graph schematically showing temperature changes on the upper and lower surfaces of a workpiece in thermoforming press working according to a conventional technique.
FIG. 5 is a graph schematically showing temperature changes on the upper and lower surfaces of the workpiece in thermoforming press working according to the method of the present invention.
FIG. 6 is a configuration diagram of a heating control device in an embodiment of the present invention.
FIG. 7 is a configuration diagram of a cooling control device in an embodiment of the present invention.
[Explanation of symbols]
1 Workpiece (steel door)
2a honeycomb core 2b frame 3 surface steel plate 4 belt conveyor 5 upper heating plate 6 lower heating plate 7a upper heating plate heating means 7b lower heating plate heating means 8 heating control device 9 cylinder 10 device housing 11 upper cooling plate 12 lower cooling plate 13a Upper cooling panel cooling means 13b Lower cooling panel cooling means 14 Cooling control device 15 Cylinder

Claims (6)

本体と、該本体の上下両面に夫々熱可塑性樹脂の接着剤を介して配置された上部及び下部外板とからなる被加工物の熱成型プレス加工を行う方法であって、
前記上部及び下部外板を夫々上部及び下部熱盤に接触させて前記被加工物を該熱盤間で熱間プレスする処理と、
前記熱間プレス後に、前記上部及び下部外板を夫々上部及び下部冷却盤に接触させて前記被加工物を該冷却盤間で冷間プレスする処理と、
前記上部冷却盤と前記下部冷却盤の温度を異なる温度にして、前記上部外板と前記下部外板が前記接着剤硬化温度に到達する時点をほぼ等しくする、
ことを特徴とする方法。A method of performing thermoforming press processing of a work piece composed of a main body and upper and lower outer plates disposed on both upper and lower surfaces of the main body via a thermoplastic resin adhesive,
The upper and lower skins are brought into contact with the upper and lower heating plates, respectively, and the workpiece is hot pressed between the heating plates; and
After the hot pressing, the upper and lower outer plates are brought into contact with the upper and lower cooling plates, respectively, and the workpiece is cold pressed between the cooling plates, and
The temperature of the upper cooling plate and the lower cooling plate are set to different temperatures, and the time point when the upper outer plate and the lower outer plate reach the adhesive curing temperature is substantially equal.
A method characterized by that. 前記上部熱盤と前記下部熱盤の温度を異なる温度にして前記上部外板と前記下部外板が前記接着剤軟化温度に到達する時点をほぼ等しくする、
ことを特徴とする請求項１に記載の熱成型プレス加工の方法。Making the temperature of the upper heat plate and the lower heat plate different from each other, and making the upper outer plate and the lower outer plate reach the adhesive softening temperature substantially equal,
The method of thermoforming press working according to claim 1. 本体と、該本体の上下両面に熱可塑性樹脂の接着剤を介して配置された上部外板及び下部外板とからなる被加工物の熱成型に適したプレス装置であって、
上下一対の熱盤と、
上下一対の冷却盤と、
前記熱盤を加熱する加熱手段と、
前記冷却盤を冷却し前記上部冷却盤の温度と前記下部冷却盤の温度を異なる温度に設定できる冷却手段と、
前記被加工物を前記上部熱盤と前記下部熱盤との間で押圧する第１の押圧手段と、
前記被加工物を前記上部冷却盤と前記下部冷却盤との間で押圧する第２の押圧手段と、
前記被加工物を、前記上部及び下部外板が夫々前記上部及び下部熱盤と対向するように装置外から該下部熱盤上に移送し、前記上部及び下部外板が夫々前記上部及び下部冷却盤と対向するように前記下部熱盤上から該下部冷却盤上に移送し、前記下部冷却盤上から装置外に移送する移送手段と
から成る熱成型プレス加工装置。A press apparatus suitable for thermoforming a workpiece comprising a main body and an upper outer plate and a lower outer plate disposed on both upper and lower surfaces of the main body via an adhesive of a thermoplastic resin,
A pair of upper and lower heating plates;
A pair of upper and lower cooling plates;
Heating means for heating the hot platen;
Cooling means for cooling the cooling plate and setting the temperature of the upper cooling plate and the temperature of the lower cooling plate to different temperatures;
First pressing means for pressing the workpiece between the upper heating plate and the lower heating plate;
A second pressing means for pressing the workpiece between the upper cooling plate and the lower cooling plate;
The workpiece is transferred from the outside of the apparatus onto the lower heating plate so that the upper and lower outer plates face the upper and lower heating plates, respectively, and the upper and lower outer plates are cooled by the upper and lower cooling plates, respectively. A thermoforming press working apparatus comprising: transfer means for transferring from above the lower heating plate to the lower cooling plate so as to face the plate, and transferring from the lower cooling plate to the outside of the device. 前記加熱手段が前記上部熱盤と前記下部熱盤の温度を異なる温度に設定できることを特徴とする請求項３に記載の熱成型プレス加工装置。  The thermoforming press working apparatus according to claim 3, wherein the heating means can set the temperature of the upper heating plate and the lower heating plate to different temperatures. 前記上部冷却盤の温度と前記下部冷却盤の温度を異なる温度に設定できるよう前記冷却手段を制御する冷却制御装置
を更に備えたことを特徴とする請求項３乃至４に記載の熱成型プレス加工装置。The thermoforming press working according to claim 3, further comprising a cooling control device that controls the cooling means so that the temperature of the upper cooling plate and the temperature of the lower cooling plate can be set to different temperatures. apparatus. 前記上部熱盤の温度と前記下部熱盤の温度を異なる温度に設定できるよう前記加熱手段を制御する加熱制御装置
を更に備えたことを特徴とする請求項４乃至５に記載の熱成型プレス加工装置。The thermoforming press according to any one of claims 4 to 5, further comprising a heating control device that controls the heating means so that the temperature of the upper heating plate and the temperature of the lower heating plate can be set to different temperatures. apparatus.
JP36925298A 1998-12-25 1998-12-25 Method and apparatus for thermoforming press working Expired - Fee Related JP4065069B2 (en)

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