JPH05318487A - Hydraulic circuit for mold mounting/demounting device - Google Patents
Hydraulic circuit for mold mounting/demounting deviceInfo
- Publication number
- JPH05318487A JPH05318487A JP4155824A JP15582492A JPH05318487A JP H05318487 A JPH05318487 A JP H05318487A JP 4155824 A JP4155824 A JP 4155824A JP 15582492 A JP15582492 A JP 15582492A JP H05318487 A JPH05318487 A JP H05318487A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- cylinder device
- pressure reducing
- hydraulic cylinder
- reducing valve
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、射出成形機等に金型
を着脱するための金型着脱装置の油圧回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit of a mold attaching / detaching device for attaching / detaching a mold to / from an injection molding machine or the like.
【０００２】[0002]
【従来の技術】例えば射出成形機にあっては、図４に示
すように可動盤Ｐと固定盤Ｑの金型取付け部Ｒに金型着
脱装置Ｓが設けられ、その金型着脱装置Ｓにより金型Ｍ
の着脱がなされている。2. Description of the Related Art For example, in an injection molding machine, a mold attaching / detaching device S is provided at a mold attaching portion R of a movable platen P and a fixed platen Q, as shown in FIG. Mold M
Is being put on and taken off.
【０００３】従来、前記金型着脱装置として図３に示す
ものがある。その金型着脱装置４０は、前記可動盤と固
定盤の金型取付け部Ｒに固着される本体ボディ４２と、
該本体ボディ４２内に前後動可能に収納されたクランプ
部材４４と、該クランプ部材４４を前後動させる油圧シ
リンダ装置５０とからなる。なお、前記クランプ部材４
４前部の正面側、すなわち金型取付け部Ｒ側はテーパー
面の金型係着部４６になっている。Conventionally, there is the mold attaching / detaching device shown in FIG. The mold attaching / detaching device 40 includes a main body 42 fixed to the mold attaching portions R of the movable plate and the fixed plate,
It comprises a clamp member 44 housed in the main body body 42 so as to be movable back and forth, and a hydraulic cylinder device 50 for moving the clamp member 44 back and forth. The clamp member 4
4 The front side of the front portion, that is, the die mounting portion R side is a die engaging portion 46 having a tapered surface.
【０００４】また前記油圧シリンダ装置５０は、ピスト
ン５２最前進位置近くにピストン前側配管口５４、ピス
トン最後退位置近くにピストン後側配管口５６が各々形
成され、その配管口５４，５６に油圧回路が連結され
る。In the hydraulic cylinder device 50, a piston front piping port 54 is formed near the piston 52 most advanced position, and a piston rear piping port 56 is formed near the piston rearmost retracting position, and hydraulic circuits are provided at the piping ports 54, 56. Are connected.
【０００５】従来の油圧回路は、図５と図６に示す構成
からなる。その油圧回路６０は、油圧ポンプから送られ
てくる加圧油を、減圧弁６２と逆止弁６４を通した後油
圧シリンダ装置５０に供給する往路６６と、油圧シリン
ダ装置５０から油をタンクに戻す復路６８とを有する。
往路６６と復路６８は、切り換え弁７０を介して油圧シ
リンダ装置５０に連結されている。A conventional hydraulic circuit has a structure shown in FIGS. 5 and 6. The hydraulic circuit 60 supplies the pressurized oil sent from the hydraulic pump to the hydraulic cylinder device 50 after passing through the pressure reducing valve 62 and the check valve 64, and the oil from the hydraulic cylinder device 50 to the tank. Return path 68.
The outward path 66 and the return path 68 are connected to the hydraulic cylinder device 50 via a switching valve 70.
【０００６】前記油圧回路６０は、金型着脱装置のクラ
ンプ時、すなわち金型の取付け時、図５に示すように油
圧ポンプから往路６６に送られてきた加圧油を、減圧弁
６２で所定の圧力に下げ、その後切り換え弁７０で分流
させてピストン５２両側の配管口５４，５６より油圧シ
リンダ装置５０内に供給する。In the hydraulic circuit 60, when the die attaching / detaching device is clamped, that is, when the die is attached, the pressure oil sent from the hydraulic pump to the outward path 66 as shown in FIG. Then, the pressure is reduced to the pressure of No. 2, and then the flow is divided by the switching valve 70 and supplied into the hydraulic cylinder device 50 through the piping ports 54 and 56 on both sides of the piston 52.
【０００７】ピストン前側の配管口５４から油圧シリン
ダ装置５０内に供給された加圧油は、ピストン前面５１
を後方に加圧し、またピストン後側の配管口５６から油
圧シリンダ装置５０内に供給された加圧油はそのピスト
ン後面５３を前方に加圧する。The pressurized oil supplied into the hydraulic cylinder device 50 from the piping port 54 on the front side of the piston is the front surface 51 of the piston.
Is pressurized rearward, and the pressurized oil supplied into the hydraulic cylinder device 50 from the piping port 56 on the piston rear side pressurizes the piston rear surface 53 forward.
【０００８】その際、ピストン前面５１の受圧面積とピ
ストン後面５３の受圧面積とを比較すると、ピストン後
面５３の受圧面積の方がピストンロッド５８の断面積分
だけ大きくなっている。したがってそのピストン前後面
の受圧面積差によりピストン後面５３側に加わる圧力が
大になって、ピストン５２およびそのピストンと一体に
なったピストンロッド５８が前方に押され前進する。そ
して、それによりクランプ部材４４が前進して、クラン
プ部材前部のテーパー面からなる金型係着部４６と前記
金型取付け部Ｒ間で金型基板Ｎを挟着する。この時、金
型係着部４６がテーパー面になっているため、クランプ
部材４４前端が金型基板Ｎの端に当たることなくスムー
ズに金型基板Ｎ表面に摺動する。At this time, comparing the pressure receiving area of the piston front surface 51 with the pressure receiving area of the piston rear surface 53, the pressure receiving area of the piston rear surface 53 is larger by the integral of the cross section of the piston rod 58. Therefore, the pressure applied to the piston rear surface 53 side increases due to the difference in pressure receiving area between the front and rear surfaces of the piston, and the piston 52 and the piston rod 58 integrated with the piston are pushed forward and moved forward. Then, as a result, the clamp member 44 advances, and the mold substrate N is sandwiched between the mold engaging portion 46 formed of the tapered surface of the front portion of the clamp member and the mold attaching portion R. At this time, since the die engaging portion 46 is a tapered surface, the front end of the clamp member 44 slides smoothly on the surface of the die substrate N without hitting the end of the die substrate N.
【０００９】他方、金型着脱装置のアンクランプ時、す
なわち金型の取外し時、油圧回路６０は、図６に示すよ
うに切り換え弁７０が作動して油圧ポンプと通じる往路
６６がピストン前側の配管口５４とのみ連結し、タンク
７２と通じる復路６８についてはピストン５２後側の配
管口５６と連結する。その結果、シリンダ装置５０内の
ピストン５２は一次減圧弁６２によって減圧された加圧
油によりピストン前面５１側から押されて後退し、それ
に応じてピストン後面５３側の油が切り換え弁７０を介
して復路６８を通りタンク７２に戻される。On the other hand, when the die attaching / detaching device is unclamped, that is, when the die is removed, in the hydraulic circuit 60, as shown in FIG. Only the port 54 is connected, and the return path 68 communicating with the tank 72 is connected to the piping port 56 on the rear side of the piston 52. As a result, the piston 52 in the cylinder device 50 is pushed back from the piston front surface 51 side by the pressurized oil whose pressure is reduced by the primary pressure reducing valve 62, and accordingly the oil on the piston rear surface 53 side is passed through the switching valve 70. It is returned to the tank 72 through the return path 68.
【００１０】ところで、前記クランプ部材４４は、前端
の金型係着部４６がテーパー面になっているため、金型
開閉の繰り返しによる振動、あるいは長時間に及ぶ金型
基板Ｎの押圧等により、金型取付け時よりもクランプ部
材４４が前進して、金型係着部４６が金型取付け時より
も金型基板Ｎ表面に食い込むことがある。そのため、ア
ンクランプ時にはクランプ時よりも大なる圧力がクラン
プ部材に加わるようにしなければ金型の取外しができな
くなることがある。By the way, since the die engaging portion 46 at the front end of the clamp member 44 has a taper surface, it may be vibrated by repeated opening and closing of the die, or the die substrate N may be pressed for a long time. The clamp member 44 may move forward more than when the die is attached, and the die engaging portion 46 may bite into the surface of the die substrate N more than when the die is attached. Therefore, when unclamping, the mold may not be detached unless a pressure larger than that during clamping is applied to the clamp member.
【００１１】しかし、前記油圧回路にあっては、クラン
プ時とアンクランプ時にシリンダ装置に供給される加圧
油は減圧弁で同じ圧力に減圧されている。しかもクラン
プ時におけるピストンの受圧面積（ピストンロッドの断
面積に相当）とアンクランプ時におけるピストンの受圧
面積（ピストンロッド外周にあるピストン前面の面積に
相当）とが、通常近似したものとされる。そのため、ク
ランプ時とアンクランプ時とでピストンの両側に加わる
圧力がほぼ等しくなり、クランプ部材が金型基板Ｎ表面
に食い込んだ場合にアンクランプが困難になることがあ
る。However, in the hydraulic circuit, the pressure oil supplied to the cylinder device at the time of clamping and unclamping is reduced to the same pressure by the pressure reducing valve. Moreover, the pressure receiving area of the piston during clamping (corresponding to the cross-sectional area of the piston rod) and the pressure receiving area of the piston during unclamping (corresponding to the area of the piston front surface on the outer circumference of the piston rod) are normally approximated. Therefore, the pressures applied to both sides of the piston during clamping and unclamping become substantially equal, and it may be difficult to unclamp when the clamping member digs into the surface of the mold substrate N.
【００１２】なお、アンクランプ用に別の油圧回路を設
けることも考えられるが、回路が複雑になってコストが
上昇する等の問題がある。Although it is conceivable to provide another hydraulic circuit for unclamping, there is a problem that the circuit becomes complicated and the cost increases.
【００１３】[0013]
【発明が解決しようとする課題】この発明は前記の問題
を解決して、アンクランプ力をクランプ力よりも大にで
きる金型着脱装置の油圧回路を提供するものである。SUMMARY OF THE INVENTION The present invention solves the above problems and provides a hydraulic circuit of a mold attaching / detaching device capable of increasing the unclamping force larger than the clamping force.
【００１４】[0014]
【課題を解決するための手段】この発明は、油圧シリン
ダ装置によりクランプ部材を前後動させる金型着脱装置
の前記油圧シリンダ装置に連結されて、切り換え弁によ
りクランプ時に加圧油を油圧シリンダ装置内のピストン
両側に供給し、他方アンクランプ時には加圧油を油圧シ
リンダ装置内のピストン前側のみに供給してピストン後
側の油を油圧シリンダ装置から排出させる金型着脱装置
の油圧回路において、油圧ポンプ側を一次減圧弁、前記
油圧シリンダ装置側を一次減圧弁よりも低圧に設定した
二次減圧弁とする二つの減圧弁を加圧油の往路に直列に
設け、前記油圧シリンダ装置と二次減圧弁間に前記切り
換え弁を設けて、アンクランプ時にピストン後側の油を
油圧シリンダ装置から排出させるとともに二次減圧弁の
パイロット回路を大気と連通するようにしたことを特徴
とする金型着脱装置の油圧回路に係る。SUMMARY OF THE INVENTION The present invention is connected to the hydraulic cylinder device of a mold attaching / detaching device for moving a clamp member back and forth by a hydraulic cylinder device, and pressurizes oil in the hydraulic cylinder device at the time of clamping by a switching valve. In the hydraulic circuit of the mold attaching / detaching device that supplies pressurized oil only to the front side of the piston in the hydraulic cylinder device and discharges the oil behind the piston from the hydraulic cylinder device during unclamping. Two pressure reducing valves, one side being the primary pressure reducing valve and the hydraulic cylinder device side being the secondary pressure reducing valve set to a pressure lower than the primary pressure reducing valve, are provided in series in the forward path of the pressurized oil, and the hydraulic cylinder device and the secondary pressure reducing valve are provided. By providing the switching valve between the valves, the oil on the rear side of the piston is discharged from the hydraulic cylinder device during unclamping, and the pilot circuit of the secondary pressure reducing valve is installed. According to the hydraulic circuit of the mold attachment apparatus is characterized in that so as to communicate with the air.
【００１５】[0015]
【実施例】以下添付の図面に従ってこの発明を詳細に説
明する。図１はこの発明の一実施例に関してクランプ時
を示す油圧回路図、図２はアンクランプ時を示す油圧回
路図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a hydraulic circuit diagram showing a clamp time according to an embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram showing an unclamp time.
【００１６】油圧回路１０は、往路１２および復路１４
と、該往路１２および復路１４を切り換え弁１６を介し
て前記油圧シリンダ装置５０のピストン前側配管口５４
とピストン後側配管口５６へ連結するピストン前側流路
１８およびピストン後側流路２０を有する。The hydraulic circuit 10 includes a forward path 12 and a return path 14.
And a piston front side piping port 54 of the hydraulic cylinder device 50 via the switching valve 16 between the forward path 12 and the return path 14.
And a piston front side flow path 18 and a piston rear side flow path 20 connected to the piston rear side piping port 56.
【００１７】往路１２は、油圧ポンプから送られてくる
加圧油を油圧回路１０に供給するためのもので、一端が
油圧ポンプ、他端が切り換え弁１６に連結されている。
この往路１２には、油圧ポンプ側に一次減圧弁２２、切
り換え弁１６側に二次減圧弁２４が直列に設けられてい
る。また、一次減圧弁２２と二次減圧弁２４間には逆止
弁２６が設けられている。The outward path 12 is for supplying the pressurized oil sent from the hydraulic pump to the hydraulic circuit 10, and has one end connected to the hydraulic pump and the other end connected to the switching valve 16.
The forward path 12 is provided with a primary pressure reducing valve 22 on the hydraulic pump side and a secondary pressure reducing valve 24 on the switching valve 16 side in series. A check valve 26 is provided between the primary pressure reducing valve 22 and the secondary pressure reducing valve 24.
【００１８】一次減圧弁２２と二次減圧弁２４は、油圧
ポンプから送られてくる加圧油を所定圧力に調整した後
油圧シリンダ装置５０に供給するためのもので、二次減
圧弁２４が一次減圧弁２２よりも低圧に設定される。減
圧弁２２，２４としては、市販のものが用いられる。こ
の実施例ではダイキン製のＭＧ−０２Ａ−１−５０を用
いている。なお破線で示す２３，２５は、減圧弁の圧力
を調整するパイロット回路である。The primary pressure-reducing valve 22 and the secondary pressure-reducing valve 24 are for adjusting the pressurized oil sent from the hydraulic pump to a predetermined pressure and then supplying it to the hydraulic cylinder device 50. The pressure is set to be lower than that of the primary pressure reducing valve 22. Commercially available pressure reducing valves 22 and 24 are used. In this embodiment, MG-02A-1-50 manufactured by Daikin is used. The broken lines 23 and 25 are pilot circuits for adjusting the pressure of the pressure reducing valve.
【００１９】逆止弁２６は、加圧油を油圧ポンプから切
り換え弁１６へ向けて流し、その逆には流れないように
するものである。The check valve 26 allows the pressurized oil to flow from the hydraulic pump to the switching valve 16 so that it does not flow in the opposite direction.
【００２０】切り換え弁１６は、４ポート２位置切り換
え弁からなり、一側が往路１２および復路１４に連結さ
れ、他側がピストン前側流路１８およびピストン後側流
路２０に連結されている。この切り換え弁１６は、後記
するようにクランプ時にピストン前側流路１８とピスト
ン後側流路２０の両者を同時に往路１２と連結し、一方
アンクランプ時には前記ピストン前側流路１８のみを往
路１２に連結して他方のピストン後側流路２０および二
次減圧弁２４のパイロット回路２５を復路１４と連結す
るものである。The switching valve 16 is a 4-port 2-position switching valve, one side of which is connected to the forward path 12 and the return path 14, and the other side of which is connected to the piston front side flow path 18 and the piston rear side flow path 20. As will be described later, the switching valve 16 connects both the piston front side flow passage 18 and the piston rear side flow passage 20 to the forward passage 12 at the same time during clamping, while only the piston front side passage 18 is connected to the forward passage 12 during unclamping. The other piston rear passage 20 and the pilot circuit 25 of the secondary pressure reducing valve 24 are connected to the return passage 14.
【００２１】復路１４は、前記切り換え弁１６とタンク
２８間を連結して、アンクランプ時に油をタンク２８に
回収するとともに二次減圧弁２４のパイロット回路２５
を大気と連通させるためのもので、一端が大気中のタン
ク２８、他端が切り換え弁１６に連結されている。The return path 14 connects the switching valve 16 and the tank 28 to collect the oil in the tank 28 at the time of unclamping and also to the pilot circuit 25 of the secondary pressure reducing valve 24.
Is connected to the atmosphere. One end is connected to the tank 28 in the atmosphere and the other end is connected to the switching valve 16.
【００２２】油圧シリンダ装置５０は、金型着脱装置の
一部をなすもので、前記図３に示した金型着脱装置４０
と同じ構成からなる。また、油圧シリンダ装置５０のピ
ストンロッド５８前端に配置されるクランプ部材４４等
も前記の金型着脱装置４０のものと同様の構成からな
る。The hydraulic cylinder device 50 forms a part of the mold attaching / detaching device, and is the mold attaching / detaching device 40 shown in FIG.
It has the same structure as. Further, the clamp member 44 and the like arranged at the front end of the piston rod 58 of the hydraulic cylinder device 50 also have the same configuration as that of the mold attaching / detaching device 40.
【００２３】次にクランプ時、アンクランプ時における
油圧回路１０の作動について説明する。この実施例では
一次減圧弁２２を１４０kg／cm2 、二次減圧弁２４を７
０kg／cm2 に設定し、またピストン５２の直径を５０m
m、ピストンロッド５８の直径を３５．５mmにした。前
記ピストン５２およびピストンロッド５８の直径から計
算されるクランプ時のピストンの受圧面積（ピストンロ
ッド５８の断面積に相当）は９．９cm2 、アンクランプ
時の受圧面積（ピストンロッド５８外周にあるピストン
５２の前面面積に相当）は９．７cm2 である。Next, the operation of the hydraulic circuit 10 during clamping and unclamping will be described. In this embodiment, the primary pressure reducing valve 22 is 140 kg / cm 2 , and the secondary pressure reducing valve 24 is 7
0kg / cm 2 and the diameter of piston 52 is 50m
m, and the diameter of the piston rod 58 was 35.5 mm. The pressure receiving area of the piston during clamping (corresponding to the cross-sectional area of the piston rod 58) calculated from the diameters of the piston 52 and the piston rod 58 is 9.9 cm 2 , and the pressure receiving area during unclamping (the piston on the outer circumference of the piston rod 58). (Corresponding to the front surface area of 52) is 9.7 cm 2 .
【００２４】まず図１に示すクランプ時について説明す
る。クランプ時、油圧回路は、切り換え弁１６によって
ピストン前側流路１８およびピストン後側流路２０の両
者が往路１２に連結される。そして、油圧ポンプから往
路１２に送られてきた加圧油は、一次減圧弁２２通過時
に１４０kg／cm2 に、さらに二次減圧弁２４通過時に７
０kg／cm2 に減圧され、その後切り換え弁１６により分
流してピストン前側流路１８とピストン後側流路２０の
両者に流れる。First, the clamp operation shown in FIG. 1 will be described. At the time of clamping, in the hydraulic circuit, both the piston front passage 18 and the piston rear passage 20 are connected to the outward passage 12 by the switching valve 16. Then, the pressurized oil sent from the hydraulic pump to the outward path 12 becomes 140 kg / cm 2 when passing through the primary pressure reducing valve 22 and 7 when passing through the secondary pressure reducing valve 24.
The pressure is reduced to 0 kg / cm 2 , and then the flow is divided by the switching valve 16 to flow to both the piston front passage 18 and the piston rear passage 20.
【００２５】ピストン前側流路１８に流れた７０kg／cm
2 の加圧油は油圧シリンダ装置５０のピストン前側配管
口５４からピストン５２の前側に流入し、他方ピストン
後側流路２０に流れた７０kg／cm2 の加圧油は油圧シリ
ンダ装置５０のピストン後側配管口５６からピストン５
２後側に流入する。そして前記で計算したクランプ時の
ピストンの受圧面積９．９cm2 と加圧油の圧力７０kg／
cm2 との積からなる押圧力６９３kgにより、ピストン５
２が前方に押され前進する。それによりピストンロッド
５８を介してクランプ部材４４が前進し、クランプ部材
前端のテーパー面からなる金型係着部４６が金型基板Ｎ
表面に係着する。70 kg / cm flowing in the piston front passage 18
The pressurized oil of 2 flows into the front side of the piston 52 from the piston front side piping port 54 of the hydraulic cylinder device 50, while the 70 kg / cm 2 pressurized oil flowing into the piston rear side flow passage 20 is the piston of the hydraulic cylinder device 50. Piston 5 from rear side piping port 56
2 It flows into the rear side. And the pressure receiving area of the piston at the time of clamping calculated above is 9.9 cm 2 and the pressure of the pressurized oil is 70 kg /
The piston pressure of 693 kg, which is the product of cm 2 and piston 5,
2 is pushed forward and moves forward. As a result, the clamp member 44 advances through the piston rod 58, and the die engaging portion 46 formed of the tapered surface at the front end of the clamp member is attached to the die substrate N.
Attach to the surface.
【００２６】それに対してアンクランプ時には、図２に
示すように切り換え弁１６によってピストン前側流路１
８のみが往路１２に連結され、ピストン後側流路２０お
よびそのピストン後側流路２０に一端のある二次減圧弁
２４のパイロット回路２５については復路１４と連結さ
れる。On the other hand, at the time of unclamping, as shown in FIG.
Only 8 is connected to the forward path 12, and the piston rear passage 20 and the pilot circuit 25 of the secondary pressure reducing valve 24 having one end in the piston rear passage 20 are connected to the return passage 14.
【００２７】油圧ポンプから往路１２に送られてきた加
圧油は、一次減圧弁２２通過時に１４０kg／cm2 にさ
れ、その後二次減圧弁２４を通過してピストン前側流路
１８に流れる。その際、二次減圧弁２４のパイロット回
路２５が復路１４を介して大気圧のタンク２８に連結さ
れてパイロット圧が大気圧になるため、パイロットが作
動せず二次減圧弁２４が減圧作用をしなくなる。その結
果、一次減圧弁２２通過時の圧力１４０kg／cm2 のまま
で加圧油が油圧シリンダ装置５０のピストン前側配管口
５４からピストン前側に流入する。The pressurized oil sent from the hydraulic pump to the outward path 12 is adjusted to 140 kg / cm 2 when passing through the primary pressure reducing valve 22, then passes through the secondary pressure reducing valve 24 and flows into the piston front passage 18. At that time, since the pilot circuit 25 of the secondary pressure reducing valve 24 is connected to the atmospheric pressure tank 28 via the return path 14 and the pilot pressure becomes atmospheric pressure, the pilot does not operate and the secondary pressure reducing valve 24 does not perform a pressure reducing action. Will not do. As a result, the pressurized oil flows into the piston front side from the piston front side piping port 54 of the hydraulic cylinder device 50 while maintaining the pressure of 140 kg / cm 2 when passing through the primary pressure reducing valve 22.
【００２８】そして、アンクランプ時のピストンの受圧
面積９．７cm2 と加圧油の圧力１４０kg／cm2 の積から
なる押圧力１３５８kgによりピストン５２が後方に押さ
れる。それによって前記クランプ部材４４がクランプ時
のほぼ倍の力で後方に押されて後退し、クランプ部材４
４前端のテーパー形状の金型係着部４６が金型基板Ｎか
ら確実に離れる。また、油圧シリンダ装置５０内のピス
トン５２後部にある油は、ピストン後部流路２０から復
路１４を通ってタンク２８に戻る。Then, the piston 52 is pushed backward by a pressing force of 1358 kg which is the product of the pressure receiving area of the piston during unclamping of 9.7 cm 2 and the pressure of the pressurized oil of 140 kg / cm 2 . As a result, the clamp member 44 is pushed rearward with a force almost double that at the time of clamping and retracts, and the clamp member 4
4 The taper-shaped die engaging portion 46 at the front end is reliably separated from the die substrate N. Further, the oil in the rear portion of the piston 52 in the hydraulic cylinder device 50 returns from the piston rear passage 20 to the tank 28 through the return passage 14.
【００２９】[0029]
【発明の効果】以上図示し説明したように、この発明に
よればクランプ時には一次減圧弁と二次減圧弁の二つの
減圧弁によって二段階に減圧された加圧油を油圧シリン
ダ装置に供給し、他方アンクランプ時には一次減圧弁の
みで減圧された加圧油を油圧シリンダ装置に供給するた
め、金型着脱装置のアンクランプ力をクランプ力よりも
大にできる。そのため、テーパー形状の金型係着部を有
するクランプ部材が、金型取付け時よりも金型基板表面
に食い込んだ場合でも確実に金型の取外しができるよう
になる。しかも、従来と同様に一つの油圧回路で済み、
アンクランプ用に別個の回路を設けなくてもよいため、
回路が複雑になる等の不具合いもない。As shown and described above, according to the present invention, pressurized oil which is depressurized in two stages by the two pressure reducing valves, the primary pressure reducing valve and the secondary pressure reducing valve, is supplied to the hydraulic cylinder device during clamping. On the other hand, since the pressurized oil whose pressure is reduced only by the primary pressure reducing valve is supplied to the hydraulic cylinder device during unclamping, the unclamping force of the mold attaching / detaching device can be made larger than the clamping force. Therefore, even when the clamp member having the taper-shaped die engaging portion digs into the surface of the die substrate more than when the die is attached, the die can be reliably removed. Moreover, one hydraulic circuit is required as in the conventional case,
Since it is not necessary to provide a separate circuit for unclamping,
There are no problems such as complicated circuits.
【図１】この発明の一実施例におけるクランプ時を示す
油圧回路図である。FIG. 1 is a hydraulic circuit diagram showing a clamped state in an embodiment of the present invention.
【図２】同実施例におけるアンクランプ時を示す油圧回
路図である。FIG. 2 is a hydraulic circuit diagram showing an unclamping state in the embodiment.
【図３】金型着脱装置の断面図である。FIG. 3 is a cross-sectional view of a mold attaching / detaching device.
【図４】射出成形機の側面図である。FIG. 4 is a side view of the injection molding machine.
【図５】従来例におけるクランプ時を示す油圧回路図で
ある。FIG. 5 is a hydraulic circuit diagram showing a conventional example during clamping.
【図６】従来例におけるアンクランプ時を示す油圧回路
図である。FIG. 6 is a hydraulic circuit diagram showing a state of unclamping in a conventional example.
１２ 往路 １４ 復路 １６ 切り換え弁 １８ ピストン前側流路 ２０ ピストン後側流路 ２２ 一次減圧弁 ２４ 二次減圧弁 ２５ 二次減圧弁のパイロット回路 ２６ 逆止弁 ４４ クランプ部材 ５０ 油圧シリンダ装置 ５２ ピストン 12 Forward path 14 Return path 16 Switching valve 18 Piston front side flow path 20 Piston rear side flow path 22 Primary pressure reducing valve 24 Secondary pressure reducing valve 25 Secondary pressure reducing valve pilot circuit 26 Check valve 44 Clamp member 50 Hydraulic cylinder device 52 Piston
Claims (1)
前後動させる金型着脱装置の前記油圧シリンダ装置に連
結されて、切り換え弁によりクランプ時には加圧油を油
圧シリンダ装置内のピストン両側に供給し、他方アンク
ランプ時には加圧油を油圧シリンダ装置内のピストン前
側のみに供給してピストン後側の油を油圧シリンダ装置
から排出させる金型着脱装置の油圧回路において、 油圧ポンプ側を一次減圧弁、前記油圧シリンダ装置側を
一次減圧弁よりも低圧に設定した二次減圧弁とする二つ
の減圧弁を加圧油の往路に直列に設け、前記油圧シリン
ダ装置と二次減圧弁間に前記切り換え弁を設けて、アン
クランプ時にピストン後側の油を油圧シリンダ装置から
排出するとともに二次減圧弁のパイロット回路を大気と
連通するようにしたことを特徴とする金型着脱装置の油
圧回路。1. A hydraulic cylinder device is connected to the hydraulic cylinder device of a mold attaching / detaching device for moving a clamp member back and forth, and a switching valve supplies pressurized oil to both sides of a piston in the hydraulic cylinder device during clamping, and the other. At the time of unclamping, in the hydraulic circuit of the mold attaching / detaching device that supplies pressurized oil only to the front side of the piston in the hydraulic cylinder device and discharges the oil on the rear side of the piston from the hydraulic cylinder device, the hydraulic pump side is connected to the primary pressure reducing valve and the hydraulic pressure Two pressure reducing valves, which are secondary pressure reducing valves set to a pressure lower than the primary pressure reducing valve on the cylinder device side, are provided in series in the forward path of the pressurized oil, and the switching valve is provided between the hydraulic cylinder device and the secondary pressure reducing valve. To discharge the oil on the rear side of the piston from the hydraulic cylinder device during unclamping and to connect the pilot circuit of the secondary pressure reducing valve to the atmosphere. Hydraulic circuit of the die detachment apparatus according to claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4155824A JP2999332B2 (en) | 1992-05-22 | 1992-05-22 | Hydraulic circuit of mold attaching / detaching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4155824A JP2999332B2 (en) | 1992-05-22 | 1992-05-22 | Hydraulic circuit of mold attaching / detaching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05318487A true JPH05318487A (en) | 1993-12-03 |
| JP2999332B2 JP2999332B2 (en) | 2000-01-17 |
Family
ID=15614293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4155824A Expired - Lifetime JP2999332B2 (en) | 1992-05-22 | 1992-05-22 | Hydraulic circuit of mold attaching / detaching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2999332B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762034A (en) * | 2021-02-10 | 2021-05-07 | 山西高行液压股份有限公司 | Ultra-precise hydraulic control method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102185198B1 (en) * | 2019-05-14 | 2020-12-01 | 국방과학연구소 | Actuator assembly operated by air pressure and oil pressure and control method for the actuator assembly |
-
1992
- 1992-05-22 JP JP4155824A patent/JP2999332B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762034A (en) * | 2021-02-10 | 2021-05-07 | 山西高行液压股份有限公司 | Ultra-precise hydraulic control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2999332B2 (en) | 2000-01-17 |
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