JP2003294010A - Hot press device and method for controlling the same - Google Patents
Hot press device and method for controlling the sameInfo
- Publication number
- JP2003294010A JP2003294010A JP2002098429A JP2002098429A JP2003294010A JP 2003294010 A JP2003294010 A JP 2003294010A JP 2002098429 A JP2002098429 A JP 2002098429A JP 2002098429 A JP2002098429 A JP 2002098429A JP 2003294010 A JP2003294010 A JP 2003294010A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hydraulic cylinder
- hydraulic
- control valve
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は上盤と可動盤との間
の複数の熱板にプレス成形物が配設され、前記可動盤を
油圧機構により上昇させて、前記熱板間でプレス成形物
の加熱・加圧を行うホットプレス装置およびホットプレ
ス装置の制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has press-formed products arranged on a plurality of hot plates between an upper plate and a movable plate, and the movable plates are raised by a hydraulic mechanism to press-form between the hot plates. The present invention relates to a hot press device for heating / pressurizing an object and a method for controlling the hot press device.
【０００２】[0002]
【従来の技術】従来油圧によって制御されるプレス装置
における圧力制御装置としては、実公平３−５７３６０
号の考案が公知である。前記考案には、電磁リリーフ弁
より油圧源からシリンダに供給する作動油の最高圧力を
制限するよう構成された圧力制御装置の、圧力源とシリ
ンダとを連結する管路の電磁圧力制御弁よりシリンダ側
に設定圧が電磁圧力制御弁の最大不感能圧以上に設定さ
れ、設定圧力以上の圧力を逃がして回路中の圧力を設定
圧力に規制する圧力規制弁を設けることが記載されてい
る。しかしながら前記考案によるものは、前記圧力規制
弁により設定圧力以上の圧力をシリンダ側へ逃がすとし
ているが、例え圧力をシリンダ側に逃がしたとしても、
いずれはシリンダ側の圧力が上昇して電磁リリーフ弁の
最大不感能圧と一致してしまうので、低圧領域における
プレス制御を適切に行うことができなかった。2. Description of the Related Art As a pressure control device in a press device which is conventionally controlled by hydraulic pressure, a utility model 3-57360 is used.
The invention of the issue is known. According to the above-mentioned invention, in a pressure control device configured to limit the maximum pressure of hydraulic oil supplied from an oil pressure source to a cylinder by an electromagnetic relief valve, the cylinder is controlled by an electromagnetic pressure control valve in a line connecting the pressure source and the cylinder. It is described that the set pressure is set to be equal to or higher than the maximum insensitive pressure of the electromagnetic pressure control valve, and a pressure regulating valve that releases the pressure equal to or higher than the set pressure to regulate the pressure in the circuit to the set pressure is provided on the side. However, in the device according to the above invention, the pressure regulating valve allows the pressure equal to or higher than the set pressure to be released to the cylinder side. However, even if the pressure is released to the cylinder side,
In some cases, the pressure on the cylinder side rises and coincides with the maximum insensitive pressure of the electromagnetic relief valve, so that press control in the low pressure region could not be appropriately performed.
【０００３】[0003]
【発明が解決しようとする課題】ホットプレス装置を用
いた積層体等のプレス成形物の成形において、成形開始
からの所定の間は熱板からの温度がプレス成形物に十分
に伝達されていないので、低圧領域でのプレス制御を行
うことが望ましい。近年プレス装置の分野の低圧領域で
のプレス制御に関しては、油圧機構にサーボバルブ等を
用いる制御も行われているが、サーボバルブやその制御
手段は高価であるという問題があった。そこで本発明に
おいては、ホットプレス装置における低圧領域における
プレス制御を安価な機構により良好に行うことを目的と
している。In forming a press-formed product such as a laminated body using a hot press device, the temperature from the hot plate is not sufficiently transmitted to the press-formed product during a predetermined period from the start of forming. Therefore, it is desirable to perform press control in the low pressure region. With respect to press control in the low pressure region in the field of press devices in recent years, control using a servo valve or the like as a hydraulic mechanism has been performed, but there is a problem that the servo valve and its control means are expensive. Therefore, an object of the present invention is to satisfactorily perform press control in a low pressure region in a hot press device with an inexpensive mechanism.
【０００４】[0004]
【課題を解決するための手段】上記のような課題を解決
するために本発明のホットプレス装置は、油圧機構の油
圧シリンダとポンプとを接続する主管路からタンクに向
けて分岐した管路に圧力制御弁を取付け、前記主管路に
おける前記圧力制御弁が取付けられた管路との分岐より
油圧シリンダ側に、油圧シリンダ側の主管路の油圧が前
記圧力制御弁の最低作動圧より小さい差圧を発生させる
差圧発生手段を設け、前記差圧発生手段より油圧シリン
ダ側の主管路からタンクに向けて分岐した管路に流量制
御弁を取付けることを特徴とする。In order to solve the above-mentioned problems, the hot press device of the present invention has a main line connecting a hydraulic cylinder of a hydraulic mechanism and a pump to a line branched toward a tank. A pressure difference that is smaller than the minimum operating pressure of the pressure control valve, with the pressure control valve attached, and the hydraulic pressure in the main line on the hydraulic cylinder side being closer to the hydraulic cylinder side than the branch in the main line from the line to which the pressure control valve is attached. Is provided, and the flow control valve is attached to a pipeline branched from the main pipeline on the hydraulic cylinder side toward the tank from the differential pressure generator.
【０００５】また、上記のような課題を解決するために
本発明のホットプレス装置の制御方法は、油圧シリンダ
とポンプとを接続する主管路からタンクに向けて分岐し
た管路に圧力制御弁を取付け、該圧力制御弁により前記
主管路の油圧を制御するとともに、主管路と前記圧力制
御弁が取付けられた管路との分岐より油圧シリンダ側の
主管路からタンクに向けて分岐した管路に流量制御弁を
取りつけ、流量制御弁を介して一部の油をアンロードさ
せ、主管路の前記圧力制御弁が取付けられた管路との分
岐と流量制御弁が取付けられた管路との分岐との間に差
圧発生手段を設け、該差圧発生手段によって差圧発生手
段より油圧シリンダ側の主管路の油圧が、前記差圧発生
手段よりポンプ側の主管路の油圧より低くなるように差
圧を発生させ、前記熱板間でプレス成形物の加圧を行う
ことを特徴とする。In order to solve the above-mentioned problems, the hot press device control method of the present invention employs a pressure control valve in a pipe branching from a main pipe connecting a hydraulic cylinder and a pump toward a tank. The pressure control valve controls the hydraulic pressure of the main pipeline, and the main pipeline on the hydraulic cylinder side is branched from the main pipeline and the pipeline on which the pressure control valve is installed toward the tank. Install a flow control valve, unload some oil through the flow control valve, and branch the main line from the line to which the pressure control valve is attached and from the line to which the flow control valve is attached. And a differential pressure generating means is provided between the differential pressure generating means and the differential pressure generating means so that the hydraulic pressure in the main pipeline on the hydraulic cylinder side of the differential pressure generating means is lower than the hydraulic pressure in the main pipeline on the pump side of the differential pressure generating means. Differential pressure is generated, And performing pressurization of press-molded with heat plates.
【０００６】[0006]
【発明の実施の形態】本発明について図１、図２を参照
して説明する。図１は、本発明のホットプレス装置の油
圧機構を示す図である。図２は、本発明のホットプレス
装置の成形圧力の制御の一例を示す図である。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a hydraulic mechanism of a hot press device according to the present invention. FIG. 2 is a diagram showing an example of control of the molding pressure of the hot press device of the present invention.
【０００７】図１において、１は、ホットプレス装置で
あって、良く知られているように、上盤２に対して昇降
自在な可動盤３が設けられ、その間にプレス板としての
熱板４が、互いに所定の距離を隔てて複数配設されてな
る構成を備えている。可動盤３には油圧シリンダ５のラ
ム６が取付けられており、前記油圧シリンダ５のシリン
ダ室７に油圧源である小容量ポンプ８、大容量ポンプ９
から油を送出することにより前記可動盤３は上昇され
る。そして可動盤３の上昇とともに、最上部の熱板４を
除く各熱板４も順次上昇され、各熱板４に配設された積
層体等のプレス成形物Ｐは、前記熱板４間で加熱・加圧
されプレス成形される。そして本発明では、前記油圧シ
リンダ５により、可動盤３等の上昇とプレス成形物Ｐの
加圧の両方が行われる。In FIG. 1, reference numeral 1 denotes a hot press apparatus, which is well known, in which a movable platen 3 which can be raised and lowered with respect to an upper platen 2 is provided, and a hot plate 4 as a press plate is provided therebetween. However, a plurality of them are arranged at a predetermined distance from each other. A ram 6 of a hydraulic cylinder 5 is attached to the movable platen 3, and a small capacity pump 8 and a large capacity pump 9 which are hydraulic pressure sources are provided in a cylinder chamber 7 of the hydraulic cylinder 5.
The movable platen 3 is raised by sending the oil from the. Then, as the movable platen 3 rises, each hot plate 4 except the uppermost hot plate 4 is also sequentially raised, and the press-formed product P such as a laminated body disposed on each hot plate 4 is distributed between the hot plates 4. Heated and pressed and press molded. In the present invention, the hydraulic cylinder 5 both raises the movable platen 3 and pressurizes the press-formed product P.
【０００８】ホットプレス装置１の油圧機構について説
明すると、油圧シリンダ５のシリンダ室７には主管路１
０が接続され、主管路１０は途中で分岐し小容量ポンプ
８と大容量ポンプ９に接続されている。小容量ポンプ８
側について先に説明すると、小容量ポンプ８側の主管路
１０からタンク１１に向けて分岐した管路１２には、圧
力制御弁としての可変電磁リリーフ弁１３が設けられて
いる。可変電磁リリーフ弁１３は、制御手段１４からの
信号により油圧機構の圧力を制御可能に設けられてい
る。また主管路１０と管路１２との分岐１０ａより油圧
シリンダ５側の主管路１０の途中には差圧発生手段１５
が設けられている。差圧発生手段１５は主管路１０にお
ける差圧発生手段１５より油圧シリンダ５側の主管路１
０の油圧が、ポンプ側の主管路１０の油圧より低くなる
よう両者の油圧に差を発生させるためのものであり、こ
の実施の形態では所定のクラッキング圧の逆止弁が用い
られている。また差圧発生手段１５については、逆止弁
に替えて流量制御弁を用いることもできる。The hydraulic mechanism of the hot press machine 1 will be described. The main pipeline 1 is provided in the cylinder chamber 7 of the hydraulic cylinder 5.
0 is connected, and the main pipe line 10 branches in the middle and is connected to the small capacity pump 8 and the large capacity pump 9. Small capacity pump 8
Explaining the side first, a variable electromagnetic relief valve 13 as a pressure control valve is provided in a pipeline 12 branched from a main pipeline 10 on the small capacity pump 8 side toward a tank 11. The variable electromagnetic relief valve 13 is provided so that the pressure of the hydraulic mechanism can be controlled by a signal from the control means 14. In addition, the differential pressure generating means 15 is provided in the middle of the main pipeline 10 on the hydraulic cylinder 5 side from the branch 10a between the main pipeline 10 and the pipeline 12.
Is provided. The differential pressure generating means 15 is a main pipeline 1 on the hydraulic cylinder 5 side of the main pipeline 10 with respect to the differential pressure generating means 15.
This is for generating a difference between the hydraulic pressures of the two so that the hydraulic pressure of 0 becomes lower than the hydraulic pressure of the main pipe line 10 on the pump side. In this embodiment, a check valve having a predetermined cracking pressure is used. As for the differential pressure generating means 15, a flow control valve can be used instead of the check valve.
【０００９】また管路１０のうちの差圧発生手段１５よ
り油圧シリンダ５側の管路１０からタンク１１に向けて
分岐した管路１６には、流量制御弁１７が取付けられて
いる。よって前記の差圧発生手段１５は、流量制御弁１
７が取付けられた管路１６と主管路１０との分岐１０ｂ
と前記分岐１０ａとの間の主管路１０に設けられている
ことになる。流量制御弁１７はこの実施の形態では圧力
補償型の流量調整弁が用いられているが、流量が制御手
段１４からの信号により可変制御可能なものを用いても
よい。また主管路１０には圧力センサ１８が取付けら
れ、圧力センサ１８による検出信号が制御手段１４に伝
達されるように設けられている。また大容量ポンプ９側
の主管路１０には逆止弁１９が取付けられ、前記逆止弁
１９よりポンプ側の主管路１０からタンク１１に向けて
分岐した管路２０にはリリーフ弁２１が取付けられてい
る。A flow rate control valve 17 is attached to a pipeline 16 of the pipeline 10 which is branched from the differential pressure generating means 15 on the hydraulic cylinder 5 side toward the tank 11. Therefore, the differential pressure generating means 15 is used in the flow control valve 1
Branch 10b of main line 10 and line 16 to which 7 is attached
Is provided in the main pipe line 10 between the branch 10a and the branch 10a. In this embodiment, the pressure control type flow rate adjusting valve is used as the flow rate control valve 17, but a flow rate control valve which can be variably controlled by a signal from the control means 14 may be used. A pressure sensor 18 is attached to the main pipeline 10, and a detection signal from the pressure sensor 18 is provided so as to be transmitted to the control means 14. A check valve 19 is attached to the main pipe line 10 on the side of the large capacity pump 9, and a relief valve 21 is attached to a pipe line 20 branched from the main pipe line 10 on the pump side of the check valve 19 toward the tank 11. Has been.
【００１０】次にホットプレス装置１によるプレス成形
工程、特に成形開始からの所定の間の低圧領域でのプレ
ス制御について説明する。まず小容量ポンプ８と大容量
ポンプ９から油を油圧シリンダ５に向けて送出し、可動
盤３を上昇させる。可動盤３が上昇されプレス成形物Ｐ
の加圧が開始されると、大容量ポンプ９は停止される
か、または図示しない弁によってアンロードされ、小容
量ポンプ８のみによりプレス成形物Ｐの加圧が行われ
る。図２に示されるように、プレス成形物Ｐの加圧は、
プレス開始から第一昇圧工程Ａ、低圧加圧工程Ｂ、第二
昇圧工程Ｃ、高圧加圧工程Ｄ、降圧工程Ｅにより制御が
なされる。第一昇圧工程Ａ、低圧加圧工程Ｂはそれぞれ
必ずしも一段階には限定されないが、それらの工程にお
いては熱板が十分昇温されていないので、プレス成形物
Ｐに対して４ｋｇ／ｃｍ２以下、特に望ましくは３ｋｇ
／ｃｍ２程度での加圧が行われる。Next, the press forming process by the hot press machine 1, particularly the press control in the low pressure region for a predetermined period from the start of forming will be described. First, oil is delivered from the small capacity pump 8 and the large capacity pump 9 toward the hydraulic cylinder 5 to raise the movable platen 3. The movable platen 3 is raised and the press-formed product P
When the pressurization is started, the large capacity pump 9 is stopped or unloaded by a valve (not shown), and the press-formed product P is pressurized only by the small capacity pump 8. As shown in FIG. 2, pressurization of the press-formed product P is
From the start of pressing, control is performed by a first pressurizing step A, a low pressure pressurizing step B, a second pressurizing step C, a high pressure pressurizing step D, and a pressure lowering step E. Each of the first pressurizing step A and the low pressure pressurizing step B is not necessarily limited to one step, but since the hot plate is not sufficiently heated in these steps, 4 kg / cm 2 or less with respect to the press-formed product P. , Especially 3kg
Pressurization is performed at about / cm 2 .
【００１１】プレス成形物Ｐの加圧時に小容量ポンプ８
から送出された油圧については、基本的には圧力制御弁
である可変電磁リリーフ弁１３によりコントロールされ
る。しかし可変電磁リリーフ弁１３については最低作動
圧があり、それ以下の油圧をコントロールすることがで
きない。そこで本発明においては主管路１０と可変電磁
リリーフ弁１３が取付けられた管路１２との分岐１０ａ
より油圧シリンダ５側の主管路１０の途中に取付けられ
た差圧発生手段１５によって、差圧発生手段１５からポ
ンプ側の主管路１０の油圧より、差圧発生手段１５から
油圧シリンダ５側の主管路１０の油圧が低くなるように
設けられている。また、差圧発生手段１５から油圧シリ
ンダ５側の主管路１０からタンク１１に向けて分岐した
管路１６には流量制御弁１７が設けられており、前記差
圧発生手段１５を介して油圧シリンダ５側の管路１０に
送出される油の一部を流量制御弁１７からアンロードす
ることにより、差圧発生手段１５で差圧が確実に発生す
るようにしている。よって油圧シリンダ５の油圧は可変
電磁リリーフ弁１３の作動油圧から差圧発生手段１５に
よる差圧（例えば逆止弁のクラッキング圧）を減算した
値に保たれる。この際差圧発生手段１５より油圧シリン
ダ５側の管路１０の油圧は、圧力センサ１８によって検
出され、可変電磁リリーフ弁１３を制御して所定の圧力
となるように制御がなされる。よってこの実施の形態で
は差圧発生手段１５と流量制御弁１７は制御手段１４に
よる制御が行われず固定的に用いられ、可変電磁リリー
フ弁１３の制御のみによって、差圧発生手段１５より油
圧シリンダ５側の油圧が前記リリーフ弁の最低作動圧以
下に制御することが可能である。しかし差圧発生手段１
５による差圧や流量制御弁１７による流量を制御手段１
４により可変制御することにより更に複雑な制御を行う
ことも可能である。When pressurizing the press-formed product P, a small capacity pump 8
The hydraulic pressure sent out from is controlled by the variable electromagnetic relief valve 13 which is basically a pressure control valve. However, the variable electromagnetic relief valve 13 has a minimum operating pressure and cannot control the hydraulic pressure below that. Therefore, in the present invention, the branch 10a between the main conduit 10 and the conduit 12 to which the variable electromagnetic relief valve 13 is attached.
Due to the differential pressure generating means 15 mounted in the middle of the main pipeline 10 on the hydraulic cylinder 5 side, the differential pressure generating means 15 causes the hydraulic pressure of the main pipeline 10 on the pump side to change from the differential pressure generating means 15 to the main pipeline on the hydraulic cylinder 5 side. It is provided so that the hydraulic pressure in the passage 10 is low. Further, a flow rate control valve 17 is provided in a pipeline 16 branched from the main pressure pipeline 10 on the hydraulic cylinder 5 side to the tank 11 from the differential pressure generator 15, and the hydraulic cylinder is provided via the differential pressure generator 15. By unloading a part of the oil sent to the pipe line 10 on the fifth side from the flow control valve 17, the differential pressure generating means 15 surely generates the differential pressure. Therefore, the hydraulic pressure of the hydraulic cylinder 5 is maintained at a value obtained by subtracting the differential pressure (for example, the cracking pressure of the check valve) from the differential pressure generating means 15 from the operating hydraulic pressure of the variable electromagnetic relief valve 13. At this time, the hydraulic pressure in the conduit 10 on the hydraulic cylinder 5 side of the differential pressure generating means 15 is detected by the pressure sensor 18, and the variable electromagnetic relief valve 13 is controlled so that the pressure becomes a predetermined pressure. Therefore, in this embodiment, the differential pressure generating means 15 and the flow rate control valve 17 are fixedly used without being controlled by the control means 14, and only the control of the variable electromagnetic relief valve 13 causes the differential pressure generating means 15 to control the hydraulic cylinder 5. It is possible to control the hydraulic pressure on the side below the minimum operating pressure of the relief valve. However, the differential pressure generating means 1
The control means 1 controls the differential pressure by 5 and the flow rate by the flow control valve 17.
It is also possible to perform more complicated control by variably controlling by 4.
【００１２】なおこの実施の形態のホットプレス装置１
では、可変電磁リリーフ弁１３の最低作動圧は１Ｍｐａ
であり、差圧発生手段１５である逆止弁のクラッキング
圧は０．９Ｍｐａのものが使用されているから、低圧領
域におけるプレス制御においては、油圧シリンダ５に作
用される油圧は０．１Ｍｐａから制御を行うことができ
る。本発明のホットプレス装置１については、ホットプ
レス装置１の大きさ等によりある程度左右されるが、小
容量ポンプ８の毎分吐出量は５リットルから１０リット
ル程度のものが使用される。また差圧発生手段１５であ
る逆止弁のクラッキング圧は０．３Ｍｐａから０．９Ｍ
ｐａ程度のものが使用され、流量制御弁１７の毎分流量
は０．５リットルから１．５リットル程度のものが使用
される。そして小容量ポンプ８の毎分吐出量に対する前
記流量制御弁１７の毎分流量は５％〜１５％程度である
ことが望ましい。そしてホットプレス装置１は、前記低
圧領域におけるプレス制御が終了すると、可変電磁リリ
ーフ弁１３の作動圧が２１Ｍｐａ程度まで上昇され、油
圧シリンダ５へ送出される油圧が上昇される。The hot press apparatus 1 of this embodiment
Then, the minimum operating pressure of the variable electromagnetic relief valve 13 is 1 MPa.
Since the check valve that is the differential pressure generating means 15 has a cracking pressure of 0.9 MPa, the hydraulic pressure applied to the hydraulic cylinder 5 is 0.1 MPa in the press control in the low pressure region. Control can be performed. Regarding the hot press device 1 of the present invention, the discharge amount per minute of the small capacity pump 8 is about 5 to 10 liters, although it depends to some extent on the size of the hot press device 1. The cracking pressure of the check valve, which is the differential pressure generating means 15, is 0.3 Mpa to 0.9 Mpa.
The flow rate control valve 17 has a flow rate per minute of about 0.5 liter to 1.5 liter. The minute flow rate of the flow rate control valve 17 with respect to the minute discharge rate of the small capacity pump 8 is preferably about 5% to 15%. Then, in the hot press device 1, when the press control in the low pressure region is completed, the operating pressure of the variable electromagnetic relief valve 13 is increased to about 21 MPa, and the hydraulic pressure sent to the hydraulic cylinder 5 is increased.
【００１３】なお、本発明のホットプレス装置１につい
ては小容量ポンプ８と大容量ポンプ９がそれぞれ一づつ
設けられたものについて記載したが、ホットプレス装置
１のポンプの数は一以上であれば特に限定するものでは
ない。さらに流量制御弁１７への管路１６の主管路との
分岐１０ｂと流量制御弁１７との間に開閉弁を取付け、
可動盤３の上昇中や、高圧領域における加圧時には前記
開閉弁を閉鎖し、ポンプから送出される油が流量制御弁
１７からタンク１１へ向けてアンロードされないように
してもよい。The hot press device 1 of the present invention is described as having one small capacity pump 8 and one large capacity pump 9, but the number of pumps of the hot press device 1 is one or more. It is not particularly limited. Further, an on-off valve is installed between the flow control valve 17 and the branch 10b with the main pipe of the pipe 16 to the flow control valve 17,
The opening / closing valve may be closed during the rising of the movable platen 3 or during pressurization in the high pressure region so that the oil delivered from the pump is not unloaded from the flow control valve 17 toward the tank 11.
【００１４】[0014]
【発明の効果】本発明のホットプレス装置においては、
主管路に差圧発生手段を設け、差圧発生手段より油圧シ
リンダ側の主管路から分岐した管路に取付けられた流量
制御弁によって一部の油をアンロード可能し、差圧発生
手段よりポンプ側の主管路から分岐した管路に取付けら
れた圧力調整弁である可変電磁リリーフ弁によって油圧
をコントロールすることにより、可変電磁リリーフ弁の
最低作動圧力以下の圧力で、油圧シリンダに作用する油
圧をコントロール可能となり、ホットプレス装置のプレ
ス開始時の低圧領域における油圧のコントロールを良好
に行うことができる。またこれらの油圧機構は、サーボ
バルブ等で制御するものと比較して安価に製造すること
ができる。In the hot pressing apparatus of the present invention,
A differential pressure generating means is provided in the main pipeline, a part of the oil can be unloaded by a flow control valve attached to the pipeline branched from the main pipeline on the hydraulic cylinder side of the differential pressure generating means, and the differential pressure generating means pumps the oil. By controlling the hydraulic pressure with a variable electromagnetic relief valve, which is a pressure regulating valve installed in the pipeline that branches from the main pipeline on the side, the hydraulic pressure that acts on the hydraulic cylinder at a pressure below the minimum operating pressure of the variable electromagnetic relief valve is controlled. It becomes possible to control, and it is possible to satisfactorily control the hydraulic pressure in the low pressure region at the start of pressing of the hot pressing device. Further, these hydraulic mechanisms can be manufactured at a lower cost than those controlled by a servo valve or the like.
【図１】本発明のホットプレス装置の油圧機構を示す図
である。FIG. 1 is a diagram showing a hydraulic mechanism of a hot press device according to the present invention.
【図２】本発明のホットプレス装置の成形圧力の制御の
一例を示す図である。FIG. 2 is a diagram showing an example of control of a molding pressure of the hot press device of the present invention.
１ ……… ホットプレス装置 ２ ……… 上盤 ３ ……… 可動盤 ４ ……… 熱板 ５ ……… 油圧シリンダ ６ ……… ラム ７ ……… シリンダ室 ８ ……… 小容量ポンプ ９ ……… 大容量ポンプ １０ …… 主管路 １０ａ，１０ｂ …… 分岐 １１ …… タンク １２，１６，２０ …… 管路 １３ …… 可変電磁リリーフ弁 １４ …… 制御手段 １５ …… 差圧発生手段 １７ …… 流量制御弁 １８ …… 圧力センサ １９ …… 逆止弁 ２１ …… リリーフ弁 Ａ ……… 第一昇圧工程 Ｂ ……… 低圧加圧工程 Ｃ ……… 第二昇圧工程 Ｄ ……… 高圧加圧工程 Ｅ ……… 降圧工程 Ｐ ……… プレス成形物 1 ……… Hot press machine 2 ……… Upper board 3 ... Movable plate 4 ……… Hot plate 5 ………… Hydraulic cylinder 6 ……… Ram 7 ……… Cylinder chamber 8 ……… Small capacity pump 9 ……… Large capacity pump 10 ... Main pipeline 10a, 10b ... Branch 11 ... Tank 12, 16, 20 …… Pipe line 13 ... Variable solenoid relief valve 14 ... Control means 15 ...... Differential pressure generating means 17 ... Flow control valve 18 ... Pressure sensor 19 ...... Check valve 21 ... Relief valve A ……… First boosting process B ……… Low pressure pressurization process C ………… Second boosting process D ………… High pressure application process E ……… Step-down process P ………… Press-formed product
Claims (2)
可動盤が設けられ、前記上盤と前記可動盤との間の複数
の熱板にプレス成形物が配設され、前記可動盤を上昇さ
せ、前記熱板間でプレス成形物の加熱・加圧を行うホッ
トプレス装置において、前記油圧機構は、可動盤を上昇
させる油圧シリンダと、該油圧シリンダの油圧源である
ポンプと、油圧シリンダとポンプとを接続する主管路
と、該主管路からタンクに向けて分岐した管路に取付け
られた圧力制御弁と、前記主管路における前記圧力制御
弁が取付けられた管路との分岐より油圧シリンダ側に取
付けられ、油圧シリンダ側の主管路の油圧が前記圧力制
御弁の最低作動圧より小さい差圧を発生させる差圧発生
手段と、前記差圧発生手段より油圧シリンダ側の主管路
からタンクに向けて分岐した管路に取付けられた流量制
御弁と、が設けられたことを特徴とするホットプレス装
置。1. A movable plate that is moved up and down by a hydraulic mechanism is provided with respect to the upper plate, and press-formed products are arranged on a plurality of hot plates between the upper plate and the movable plate. In a hot press device that raises and heats / pressurizes a press-formed product between the hot plates, the hydraulic mechanism includes a hydraulic cylinder that raises a movable plate, a pump that is a hydraulic source of the hydraulic cylinder, and a hydraulic cylinder. And a pump, a main control line connecting the main control line and the pump, a pressure control valve attached to the main control line branching toward the tank, and a hydraulic pressure branching from the main control line in which the pressure control valve is attached. A pressure difference generating means which is mounted on the cylinder side and generates a pressure difference in which the oil pressure in the main line on the hydraulic cylinder side is smaller than the minimum operating pressure of the pressure control valve, and a main line on the hydraulic cylinder side from the pressure difference generating means to the tank. Towards A flow control valve attached to tube channel Toki, heat pressing apparatus, characterized in that is provided.
可動盤が設けられ、前記上盤と前記可動盤との間の複数
の熱板にプレス成形物が配設され、前記可動盤を上昇さ
せ、前記熱板間でプレス成形物の加熱・加圧を行うホッ
トプレス装置の制御方法において、可動盤を上昇させる
油圧シリンダと該油圧シリンダの油圧源であるポンプと
前記油圧シリンダとポンプを接続する主管路が設けら
れ、該主管路からタンクに向けて分岐した管路に圧力制
御弁を取付け、該圧力制御弁により前記主管路の油圧を
制御するとともに、主管路と前記圧力制御弁が取付けら
れた管路との分岐より油圧シリンダ側の主管路からタン
クに向けて分岐した管路に流量制御弁を取りつけ、該流
量制御弁を介して一部の油をアンロードさせ、前記主管
路の前記圧力制御弁が取付けられた管路との分岐と流量
制御弁が取付けられた管路との分岐との間に差圧発生手
段を設け、該差圧発生手段によって差圧発生手段より油
圧シリンダ側の主管路の油圧が、前記差圧発生手段より
ポンプ側の主管路の油圧より低くなるように差圧を発生
させ、前記熱板間でプレス成形物の加圧を行うことを特
徴とするホットプレス装置の制御方法。2. A movable plate that is moved up and down by a hydraulic mechanism is provided with respect to the upper plate, and press-formed products are arranged on a plurality of hot plates between the upper plate and the movable plate. In a method of controlling a hot press device that raises and heats and pressurizes a press-formed product between the hot plates, a hydraulic cylinder that raises a movable plate, a pump that is a hydraulic source of the hydraulic cylinder, the hydraulic cylinder, and the pump are provided. A main pipeline to be connected is provided, a pressure control valve is attached to the pipeline branched from the main pipeline toward the tank, and the hydraulic pressure of the main pipeline is controlled by the pressure control valve, and the main pipeline and the pressure control valve are A flow control valve is attached to a pipeline branched from the main pipeline on the hydraulic cylinder side toward the tank from the branch with the attached pipeline, and a part of the oil is unloaded through the flow control valve, and the main pipeline is connected. Of the pressure control valve A differential pressure generating means is provided between the branch with the attached pipeline and the branch with the flow rate control valve, and the differential pressure generating means causes the main pipeline on the hydraulic cylinder side of the differential pressure generating means to move toward the hydraulic cylinder side. Control of a hot press device characterized in that a differential pressure is generated so that the hydraulic pressure is lower than the hydraulic pressure of the main pipe line on the pump side of the differential pressure generating means, and the press-formed product is pressed between the hot plates. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002098429A JP2003294010A (en) | 2002-04-01 | 2002-04-01 | Hot press device and method for controlling the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002098429A JP2003294010A (en) | 2002-04-01 | 2002-04-01 | Hot press device and method for controlling the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003294010A true JP2003294010A (en) | 2003-10-15 |
Family
ID=29240425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002098429A Pending JP2003294010A (en) | 2002-04-01 | 2002-04-01 | Hot press device and method for controlling the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003294010A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374266C (en) * | 2006-03-30 | 2008-03-12 | 苏州苏福马机械有限公司 | Method of reducing hydraulic system power of multi layer hot press and practical appts |
| CN102121485A (en) * | 2011-01-27 | 2011-07-13 | 济南易久自动化技术有限公司 | Controllable centralized oil supply hydraulic system with multiple press power for multiple hydraulic press machines |
| CN103331407A (en) * | 2013-07-04 | 2013-10-02 | 天津市天锻压力机有限公司 | Automatic cooling system of upper demoulding mechanism of wheel forging forming hydraulic press |
-
2002
- 2002-04-01 JP JP2002098429A patent/JP2003294010A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374266C (en) * | 2006-03-30 | 2008-03-12 | 苏州苏福马机械有限公司 | Method of reducing hydraulic system power of multi layer hot press and practical appts |
| CN102121485A (en) * | 2011-01-27 | 2011-07-13 | 济南易久自动化技术有限公司 | Controllable centralized oil supply hydraulic system with multiple press power for multiple hydraulic press machines |
| CN103331407A (en) * | 2013-07-04 | 2013-10-02 | 天津市天锻压力机有限公司 | Automatic cooling system of upper demoulding mechanism of wheel forging forming hydraulic press |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5058426B2 (en) | Control device for hydraulic press and operation method of hydraulic press | |
| US4142368A (en) | Hydraulic system for supplying hydraulic fluid to a hydraulically operated device alternately at pressures of different value | |
| JP5148175B2 (en) | Resin sealing device and resin sealing method | |
| US20090145192A1 (en) | Pressure Controlled Superplastic Forming | |
| CN101791651A (en) | Superplastic forming and processing method for sheets and superplastic-forming air pressure loading device thereof | |
| JP2017100155A (en) | Slide cushion device of press machine | |
| JP2003294010A (en) | Hot press device and method for controlling the same | |
| CN103939738B (en) | Control method of valve low temperature detection helium gas recycling system | |
| JP5139175B2 (en) | Pressure increase method during re-pressurization | |
| KR101261300B1 (en) | Press apparatus and press method | |
| CN111706559B (en) | Quick stamping hydraulic system | |
| WO2005035232A1 (en) | Platen press | |
| JP7120724B2 (en) | Hydraulic press and its operating method | |
| KR100508981B1 (en) | A device for warm hydro-forming of aluminium alloy and a method | |
| CN110370443B (en) | High-pressure forming slurry curve pressurizing device and method | |
| CN201046985Y (en) | Automatic aerating device | |
| JP2012040601A (en) | Press forming system and control method for press forming system | |
| JP3802805B2 (en) | Hot press molding method | |
| JPH08118083A (en) | Over load protector of hydraulically driven link press machine | |
| KR101951620B1 (en) | Semiconductor encapsulation system comprising a vacuum pump and a reservoir pump | |
| SU948538A1 (en) | Apparatus for hot isostatic pressing of powder articles | |
| JP2700543B2 (en) | Thermal pressure control method for multi-stage press | |
| JPH06339800A (en) | Hydraulic press apparatus and method for controlling pressurizing force thereof | |
| KR20090076774A (en) | Hydraulic pressure molding method and molding device using backpressure | |
| JP4510992B2 (en) | Control method of press hydraulic power source |