JP5295705B2 - Clamping device - Google Patents
Clamping device Download PDFInfo
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- JP5295705B2 JP5295705B2 JP2008257321A JP2008257321A JP5295705B2 JP 5295705 B2 JP5295705 B2 JP 5295705B2 JP 2008257321 A JP2008257321 A JP 2008257321A JP 2008257321 A JP2008257321 A JP 2008257321A JP 5295705 B2 JP5295705 B2 JP 5295705B2
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- 239000012530 fluid Substances 0.000 claims description 60
- 230000001808 coupling Effects 0.000 claims description 28
- 238000010168 coupling process Methods 0.000 claims description 28
- 238000005859 coupling reaction Methods 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 21
- 238000000465 moulding Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract 3
- 239000010720 hydraulic oil Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 19
- 238000001514 detection method Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000004512 die casting Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
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- 101710043352 SHFL Proteins 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Abstract
Description
移動ダイプレート4は、移動金型6を前面(固定ダイプレート3に対向する側)に保持している。移動ダイプレート4は、ベース2上に型開方向A1および型閉方向A2に移動可能に設けられている。具体的には、図1及び図3に示すように、ベース2上に固定された摺動板11と、移動ダイプレート4の下方に固定され、摺動板11に対して摺動可能な摺動板12とによりスライダが構成されることにより、移動ダイプレート4は移動可能にベース2に対して支持されている。また、移動ダイプレート4には、タイバー7が挿入される貫通孔4hが形成されている。この貫通孔4hは、たとえば、移動ダイプレート4の四隅に形成されている。
固定金型5と移動金型6の一対の金型が型閉されることにより、固定金型5の凹部5a(図1)と移動金型6の凹部6a(図1)との間にキャビティC(図3)が形成される。 The fixed die plate 3 is fixed on the base 2. The fixed die plate 3 holds the fixed mold 5 on the front side.
The moving die plate 4 holds the moving mold 6 on the front surface (side facing the fixed die plate 3). The moving die plate 4 is provided on the base 2 so as to be movable in the mold opening direction A1 and the mold closing direction A2. Specifically, as shown in FIGS. 1 and 3, a sliding plate 11 fixed on the base 2 and a sliding plate fixed below the movable die plate 4 and slidable with respect to the sliding plate 11. Since the slider is constituted by the moving plate 12, the movable die plate 4 is supported with respect to the base 2 so as to be movable. The moving die plate 4 is formed with a through hole 4h into which the tie bar 7 is inserted. For example, the through holes 4 h are formed at the four corners of the movable die plate 4.
By closing the pair of molds of the fixed mold 5 and the movable mold 6, a cavity is formed between the recess 5 a (FIG. 1) of the fixed mold 5 and the recess 6 a (FIG. 1) of the movable mold 6. C (FIG. 3) is formed.
なお、各部60〜65を含んで射出装置が構成される。また、型締装置1や射出装置を含んでダイカストマシン(成形機)が構成される。 As shown in FIG. 3, the piston rod 64 is advanced in a state where the molten metal ML is supplied to the sleeve 60 through the supply port 60a, thereby forming between the clamped fixed mold 5 and the movable mold 6. The molten metal ML as a molding material is injected and filled in the cavity C to be formed.
In addition, an injection apparatus is comprised including each part 60-65. Further, a die casting machine (molding machine) is configured including the mold clamping device 1 and the injection device.
W1=π/4×(D12−D42)×P1×n…(1)
となる。 Then, assuming that the pressure difference between the pressure supplied to the first cylinder chamber 67a and the tank pressure is P1, the number of tie bars is n, and the tank pressure is sufficiently smaller than the pressure difference P1, the mold clamping force W1 is
W1 = π / 4 × (D1 2 −D4 2 ) × P1 × n (1)
It becomes.
Q1=π/4×(D32−D42)×v×n…(2)
となる。なお、上述の型締時と同様の制御をするとすれば、必要流量は、(2)式において、(D32−D42)に代えて(D12−D42)が用いられることになる。従って、ランアラウンド回路により、必要流量Q1が低減されていることが理解される。 The required flow rate Q1 at this time is expressed as follows, where the required speed of the clamping cylinder 9 is v (mm / s):
Q1 = π / 4 × (D3 2 −D4 2 ) × v × n (2)
It becomes. If the same control as that at the time of mold clamping is performed, the required flow rate is (D1 2 -D4 2 ) instead of (D3 2 -D4 2 ) in equation (2). Therefore, it is understood that the required flow rate Q1 is reduced by the run-around circuit.
W2=π/4×(D22−D32)×P1×n…(3)
となる。また、型開方向の必要流量Q2は、
Q2=π/4×(D22−D32)×v×n…(4)
となる。 The mold opening force W2 at this time is
W2 = π / 4 × (D2 2 −D3 2 ) × P1 × n (3)
It becomes. The required flow rate Q2 in the mold opening direction is
Q2 = π / 4 × (D2 2 −D3 2 ) × v × n (4)
It becomes.
Q3=π/4×(D22−D42)×v×n…(5)
となる。 The required flow rate Q3 at this time is
Q3 = π / 4 × (D2 2 −D4 2 ) × v × n (5)
It becomes.
W1=π/4×(4402−2002)×16.5/9.8/1000×4
=812tonf
W2=π/4×(2752−2402)×16.5/9.8/1000×4
=95.3tonf
Q2=π/4×(2752−2402)×10×60/1000000×4
=34L/min The mold clamping force W1, the mold opening force W2, and the necessary flow rate Q2 are the same in both of the present embodiment and the prior art of FIG. 7, and from the formulas (1), (3), and (4), become.
W1 = π / 4 × (440 2 −200 2 ) × 16.5 / 9.8 / 1000 × 4
= 812tonf
W2 = π / 4 × (275 2 −240 2 ) × 16.5 / 9.8 / 1000 × 4
= 95.3tonf
Q2 = π / 4 × (275 2 −240 2 ) × 10 × 60/1000000 × 4
= 34L / min
Q1=π/4×(2402−2002)×10×60/1000000×4
=33L/min
となる。 The required flow rate Q1 in the present embodiment is obtained from the equation (2):
Q1 = π / 4 × (240 2 −200 2 ) × 10 × 60/1000000 × 4
= 33L / min
It becomes.
Q3=π/4×(2752−2002)×10×60/1000000×4
=67L/min
となる。 On the other hand, the required flow rate Q3 in the prior art shown in FIG.
Q3 = π / 4 × (275 2 −200 2 ) × 10 × 60/1000000 × 4
= 67L / min
It becomes.
第2ロッド部の一例であり、第1方向制御弁83は本発明の第1の弁の一例であり、第2方向制御弁84は本発明の第2の弁の一例であり、第3方向制御弁85は本発明の第3の弁の一例であり、第4方向制御弁87は本発明の第4の弁の一例である。 In the above embodiment, the half nut 20 is an example of the coupling portion of the present invention, the hydraulic source 75 is an example of the hydraulic pressure source of the present invention, and the hydraulic circuit 76 is an example of the hydraulic circuit of the present invention. The tie bar body 7b is an example of the first rod portion of the present invention, the tie bar end portion 7c is an example of the second rod portion of the present invention, and the first directional control valve 83 is the first valve portion of the present invention. The second direction control valve 84 is an example of the second valve of the present invention, the third direction control valve 85 is an example of the third valve of the present invention, and the fourth direction control valve 87 is the present. It is an example of the 4th valve of invention.
Claims (6)
- 固定金型を保持する固定ダイプレートと、
移動金型を保持し、前記固定ダイプレートに対して型開閉方向に移動可能な移動ダイプレートと、
前記固定ダイプレート又は前記移動ダイプレートのいずれか一方に結合するための被結合部と、前記固定ダイプレート又は前記移動ダイプレートのいずれか他方に収容され、型締力を発生させるためのピストンとが設けられたタイバーと、
前記固定ダイプレート又は前記移動ダイプレートの前記一方に備わり、前記被結合部に対して結合又は解放可能な結合部と、
前記固定ダイプレート又は前記移動ダイプレートの前記他方に備わり、前記ピストンを収容する型締シリンダと、
前記型締シリンダに所定圧力の作動液を供給する液圧源と、
前記型締シリンダから排出された作動液を収容するタンクと、
前記液圧源、前記タンク及び前記型締シリンダの間における作動液の流れを制御する液圧回路と、
を有し、
前記型締シリンダは、
大径シリンダ室と、
前記大径シリンダ室のダイプレート対向面側とは反対側に連通し、前記大径シリンダ室よりも径が小さい小径シリンダ室と、
を有し、
前記ピストンは、
前記大径シリンダ室において摺動可能であり、前記大径シリンダ室を、前記小径シリンダ室とは反対側の第1シリンダ室と、前記小径シリンダ室側の第2シリンダ室とに区画する大径ピストン部と、
前記大径ピストン部の前記小径シリンダ室側の端面から突出し、前記小径シリンダ室を摺動可能な小径ピストン部と、
を有し、
前記タイバーは、
前記大径ピストン部のダイプレート対向面側の端面から突出し、前記小径ピストン部よりも径が小さく、前記第1シリンダ室の前記ダイプレート対向面側に開口する開口部を閉塞する第1ロッド部と、
前記小径ピストン部のダイプレート対向面側とは反対側の端面から突出し、前記第1ロッド部よりも径が大きく、前記小径シリンダ室のダイプレート対向面側とは反対側に開口する開口部を閉塞する第2ロッド部と、
を有し、
前記液圧回路は、
前記第1シリンダ室と前記第2シリンダ室とを接続又は遮断可能、
前記第1シリンダ室と前記小径シリンダ室とを接続又は遮断可能、
前記液圧源からの作動液の供給先を前記第1シリンダ室と前記小径シリンダ室との間で切り換え可能、
前記液圧源からの作動液の供給先を前記第1シリンダ室とした状態で、前記第2シリンダ室及び前記小径シリンダ室から前記タンクへの作動液の排出を許容又は禁止可能、
に構成されている
型締装置。 A fixed die plate for holding a fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening and closing direction with respect to the fixed die plate;
A coupled portion for coupling to either the fixed die plate or the movable die plate, and a piston for generating a mold clamping force housed in the other of the fixed die plate or the movable die plate; A tie bar with
The one of the fixed die plate or the movable die plate, and a coupling part that can be coupled to or released from the coupled part;
A mold clamping cylinder provided on the other of the fixed die plate or the movable die plate and containing the piston;
A hydraulic pressure source for supplying hydraulic fluid of a predetermined pressure to the mold clamping cylinder;
A tank for storing the hydraulic fluid discharged from the mold clamping cylinder;
A hydraulic circuit for controlling the flow of hydraulic fluid between the hydraulic pressure source, the tank and the clamping cylinder;
Have
The mold clamping cylinder is
A large-diameter cylinder chamber;
A small-diameter cylinder chamber that communicates with the opposite side of the large-diameter cylinder chamber on the side opposite to the die plate, and has a smaller diameter than the large-diameter cylinder chamber;
Have
The piston is
The large diameter cylinder chamber is slidable in the large diameter cylinder chamber and divides the large diameter cylinder chamber into a first cylinder chamber opposite to the small diameter cylinder chamber and a second cylinder chamber on the small diameter cylinder chamber side. A piston part;
A small-diameter piston portion projecting from the end surface of the large-diameter piston portion on the small-diameter cylinder chamber side, and capable of sliding the small-diameter cylinder chamber;
Have
The tie bar is
A first rod portion that protrudes from an end surface of the large-diameter piston portion on the die plate facing surface side, has a smaller diameter than the small-diameter piston portion, and closes an opening opening on the die plate facing surface side of the first cylinder chamber. When,
An opening projecting from the end surface opposite to the die plate facing surface side of the small diameter piston portion, having a diameter larger than that of the first rod portion and opening to the opposite side of the small diameter cylinder chamber to the die plate facing surface side. A second rod portion for closing;
Have
The hydraulic circuit is
The first cylinder chamber and the second cylinder chamber can be connected or disconnected,
The first cylinder chamber and the small diameter cylinder chamber can be connected or disconnected,
The supply destination of hydraulic fluid from the hydraulic pressure source can be switched between the first cylinder chamber and the small diameter cylinder chamber.
In a state where the supply destination of the hydraulic fluid from the hydraulic pressure source is the first cylinder chamber , discharge of the hydraulic fluid from the second cylinder chamber and the small diameter cylinder chamber to the tank can be permitted or prohibited.
Clamping device is composed of. - 固定金型を保持する固定ダイプレートと、
移動金型を保持し、前記固定ダイプレートに対して型開閉方向に移動可能な移動ダイプレートと、
前記固定ダイプレート又は前記移動ダイプレートのいずれか一方に結合するための被結合部と、前記固定ダイプレート又は前記移動ダイプレートのいずれか他方に収容され、型締力を発生させるためのピストンとが設けられたタイバーと、
前記固定ダイプレート又は前記移動ダイプレートの前記一方に備わり、前記被結合部に対して結合又は解放可能な結合部と、
前記固定ダイプレート又は前記移動ダイプレートの前記他方に備わり、前記ピストンを収容する型締シリンダと、
前記型締シリンダに所定圧力の作動液を供給する液圧源と、
前記型締シリンダから排出された作動液を収容するタンクと、
前記液圧源、前記タンク及び前記型締シリンダの間における作動液の流れを制御する液圧回路と、
を有し、
前記型締シリンダは、
大径シリンダ室と、
前記大径シリンダ室のダイプレート対向面側とは反対側に連通し、前記大径シリンダ室よりも径が小さい小径シリンダ室と、
を有し、
前記ピストンは、
前記大径シリンダ室において摺動可能であり、前記大径シリンダ室を、前記小径シリンダ室とは反対側の第1シリンダ室と、前記小径シリンダ室側の第2シリンダ室とに区画する大径ピストン部と、
前記大径ピストン部の前記小径シリンダ室側の端面から突出し、前記小径シリンダ室を摺動可能な小径ピストン部と、
を有し、
前記タイバーは、
前記大径ピストン部のダイプレート対向面側の端面から突出し、前記小径ピストン部よりも径が小さく、前記第1シリンダ室の前記ダイプレート対向面側に開口する開口部を閉塞する第1ロッド部と、
前記小径ピストン部のダイプレート対向面側とは反対側の端面から突出し、前記第1ロッド部よりも径が大きく、前記小径シリンダ室のダイプレート対向面側とは反対側に開口する開口部を閉塞する第2ロッド部と、
を有し、
前記液圧回路は、
前記第1シリンダ室に接続された第1流路と、
前記第2シリンダ室に接続された第2流路と、
前記小径シリンダ室に接続された第3流路と、
前記第1流路と前記第2流路とを接続する第1連通流路と、
前記第2流路と前記第3流路とを接続する第2連通流路と、
前記第1連通流路を開閉する第1の弁と、
前記第2連通流路を開閉する第2の弁と、
前記第1流路と前記液圧源とを接続しつつ前記第3流路と前記タンクとを接続し、又は、前記第1流路と前記タンクとを接続しつつ前記第3流路と前記液圧源とを接続するように切り替えられる第3の弁と、
前記第3流路を、当該第3流路と前記第2連通流路との接続位置よりも前記第3の弁側において開閉する第4の弁と、
を有する型締装置。 A fixed die plate for holding a fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening and closing direction with respect to the fixed die plate;
A coupled portion for coupling to either the fixed die plate or the movable die plate, and a piston for generating a mold clamping force housed in the other of the fixed die plate or the movable die plate; A tie bar with
The one of the fixed die plate or the movable die plate, and a coupling part that can be coupled to or released from the coupled part;
A mold clamping cylinder provided on the other of the fixed die plate or the movable die plate and containing the piston;
A hydraulic pressure source for supplying hydraulic fluid of a predetermined pressure to the mold clamping cylinder;
A tank for storing the hydraulic fluid discharged from the mold clamping cylinder;
A hydraulic circuit for controlling the flow of hydraulic fluid between the hydraulic pressure source, the tank and the clamping cylinder;
Have
The mold clamping cylinder is
A large-diameter cylinder chamber;
A small-diameter cylinder chamber that communicates with the opposite side of the large-diameter cylinder chamber on the side opposite to the die plate, and has a smaller diameter than the large-diameter cylinder chamber;
Have
The piston is
The large diameter cylinder chamber is slidable in the large diameter cylinder chamber and divides the large diameter cylinder chamber into a first cylinder chamber opposite to the small diameter cylinder chamber and a second cylinder chamber on the small diameter cylinder chamber side. A piston part;
A small-diameter piston portion projecting from the end surface of the large-diameter piston portion on the small-diameter cylinder chamber side, and capable of sliding the small-diameter cylinder chamber;
Have
The tie bar is
A first rod portion that protrudes from an end surface of the large-diameter piston portion on the die plate facing surface side, has a smaller diameter than the small-diameter piston portion, and closes an opening opening on the die plate facing surface side of the first cylinder chamber. When,
An opening projecting from the end surface opposite to the die plate facing surface side of the small diameter piston portion, having a diameter larger than that of the first rod portion and opening to the opposite side of the small diameter cylinder chamber to the die plate facing surface side. A second rod portion for closing;
Have
The hydraulic circuit is
A first flow path connected to the first cylinder chamber;
A second flow path connected to the second cylinder chamber;
A third flow path connected to the small diameter cylinder chamber;
A first communication channel connecting the first channel and the second channel;
A second communication channel connecting the second channel and the third channel;
A first valve that opens and closes the first communication channel;
A second valve for opening and closing the second communication channel;
The third flow path and the tank are connected while the first flow path and the hydraulic pressure source are connected, or the third flow path and the tank are connected with the first flow path and the tank. A third valve that is switched to connect to a hydraulic pressure source;
A fourth valve that opens and closes the third flow path on the third valve side with respect to a connection position between the third flow path and the second communication flow path;
That having a mold clamping apparatus. - 前記被結合部と前記結合部とが結合していないときに、
前記第1シリンダ室と、前記第2シリンダ室及び前記小径シリンダ室とを接続し、前記第2シリンダ室及び前記小径シリンダ室から前記タンクへの作動液の排出を禁止した状態における、前記第1シリンダ室への作動液の供給、及び、
前記第1シリンダ室と前記第2シリンダ室とを接続し、前記第1シリンダ室及び前記第2シリンダ室と前記小径シリンダ室とを遮断し、前記第1シリンダ室から前記タンクへの作動液の排出を許容した状態における、前記小径シリンダ室への作動液の供給、
を選択的に行い、前記被結合部と前記結合部とが結合可能な位置に前記タイバーを移動させ、
前記被結合部と前記結合部とが結合しているときに、前記第1シリンダ室と、前記第2シリンダ室及び前記小径シリンダ室とを遮断し、前記第2シリンダ室及び前記小径シリンダ室から前記タンクへの作動液の排出を許容した状態で、前記第1シリンダ室に作動液を供給して型締めを行うように、
前記結合部及び前記液圧回路を制御する制御装置を有する
請求項1又は2に記載の型締装置。 When the coupled portion and the coupling portion are not coupled,
The first cylinder chamber is connected to the second cylinder chamber and the small-diameter cylinder chamber, and the first cylinder chamber is in a state in which the discharge of hydraulic fluid from the second cylinder chamber and the small-diameter cylinder chamber to the tank is prohibited. Supply of hydraulic fluid to the cylinder chamber, and
The first cylinder chamber and the second cylinder chamber are connected, the first cylinder chamber, the second cylinder chamber, and the small-diameter cylinder chamber are shut off , and the working fluid is supplied from the first cylinder chamber to the tank. Supply of hydraulic fluid to the small-diameter cylinder chamber in a state where discharge is permitted ,
Selectively moving the tie bar to a position where the coupled portion and the coupling portion can be coupled,
When the coupled portion and the coupling portion are coupled, the first cylinder chamber, the second cylinder chamber, and the small-diameter cylinder chamber are blocked, and the second cylinder chamber and the small-diameter cylinder chamber are separated from each other. In a state where the discharge of the hydraulic fluid to the tank is allowed, the hydraulic fluid is supplied to the first cylinder chamber to perform mold clamping.
The mold clamping device according to claim 1, further comprising a control device that controls the coupling portion and the hydraulic circuit. - 前記移動ダイプレートを型開閉方向へ移動させる移動機構を有し、
前記制御装置は、
成形材料の凝固後、前記第1シリンダ室と前記第2シリンダ室とを接続し、前記第1シリンダ室及び前記第2シリンダ室と前記小径シリンダ室とを遮断した状態で、前記小径シリンダ室に作動液を供給して前記移動ダイプレートを型開方向に移動させ、前記固定金型と前記移動金型とを離間させ、
その離間後、前記被結合部と前記結合部との解放を行い、
前記解放後、前記移動機構により前記移動ダイプレートを更に型開方向へ移動させ、
前記解放後から次サイクルの型接触時までに、
前記第1シリンダ室と、前記第2シリンダ室及び前記小径シリンダ室とを接続し、前記第2シリンダ室及び前記小径シリンダ室から前記タンクへの作動液の排出を禁止した状態における、前記第1シリンダ室への作動液の供給、及び、
前記第1シリンダ室と前記第2シリンダ室とを接続し、前記第1シリンダ室及び前記第2シリンダ室と前記小径シリンダ室とを遮断し、前記第1シリンダ室から前記タンクへの作動液の排出を許容した状態における、前記小径シリンダ室への作動液の供給、
を選択的に行い、前記被結合部と前記結合部とが型接触状態において結合可能な位置へ、前記タイバーを移動させるように、
前記移動機構、前記結合部及び前記液圧回路を制御する
請求項3に記載の型締装置。 A moving mechanism for moving the moving die plate in the mold opening and closing direction;
The controller is
After the molding material is solidified, the first cylinder chamber and the second cylinder chamber are connected, and the first cylinder chamber, the second cylinder chamber, and the small diameter cylinder chamber are blocked, Supplying hydraulic fluid, moving the movable die plate in the mold opening direction, separating the fixed mold and the movable mold;
After the separation, release the coupled portion and the coupling portion,
After the release, the moving die plate is further moved in the mold opening direction by the moving mechanism,
From after the release until the mold contact of the next cycle,
The first cylinder chamber is connected to the second cylinder chamber and the small-diameter cylinder chamber, and the first cylinder chamber is in a state in which the discharge of hydraulic fluid from the second cylinder chamber and the small-diameter cylinder chamber to the tank is prohibited. Supply of hydraulic fluid to the cylinder chamber, and
The first cylinder chamber and the second cylinder chamber are connected, the first cylinder chamber, the second cylinder chamber, and the small-diameter cylinder chamber are shut off, and the working fluid is supplied from the first cylinder chamber to the tank. Supply of hydraulic fluid to the small-diameter cylinder chamber in a state where discharge is permitted,
And selectively moving the tie bar to a position where the coupled portion and the coupling portion can be coupled in a mold contact state .
The mold clamping apparatus according to claim 3 , wherein the moving mechanism, the coupling portion, and the hydraulic circuit are controlled. - 前記制御装置は、
前記次サイクルにおける型閉じ開始までに、前記タイバーを前記次サイクルにおける前記結合可能な位置へ到達させ、
その到達後に生じた、前記タイバーの位置と前記次サイクルにおける前記結合可能な位置とのずれをなくすように、前記次サイクルにおける型閉じ中において前記タイバーを移動させる
請求項4に記載の型締装置。 The controller is
The tie bar reaches the connectable position in the next cycle by the start of mold closing in the next cycle,
The mold clamping device according to claim 4, wherein the tie bar is moved during mold closing in the next cycle so as to eliminate a deviation between the position of the tie bar and the position where the tie bar can be combined in the next cycle, which occurs after the arrival. . - 固定金型を保持する固定ダイプレートと、
移動金型を保持し、前記固定ダイプレートに対して型開閉方向に移動可能な移動ダイプレートと、
前記固定金型及び前記移動金型を型締する型締力を発生させるピストン及び当該ピストンを収容する型締シリンダと、
前記型締シリンダに所定圧力の作動液を供給する液圧源と、
前記型締シリンダから排出された作動液を収容するタンクと、
前記液圧源、前記タンク及び前記型締シリンダの間における作動液の流れを制御する液圧回路と、
を有し、
前記型締シリンダは、
前記移動ダイプレートを型締方向へ移動させる際に作動液が供給される大径シリンダ室と、
前記大径シリンダ室に連通し、前記大径シリンダ室よりも径が小さく、前記移動ダイプレートを型開方向へ移動させる際に作動液が供給される小径シリンダ室と、
を有し、
前記ピストンは、
前記大径シリンダ室において摺動可能であり、前記大径シリンダ室を、前記小径シリンダ室とは反対側の第1シリンダ室と、前記小径シリンダ室側の第2シリンダ室とに区画する大径ピストン部と、
前記大径ピストン部の前記小径シリンダ室側の端面から突出し、前記小径シリンダ室を摺動可能な小径ピストン部と、
を有し、
前記小径ピストン部の前記小径シリンダ室側の端面からは、前記小径シリンダ室の前記大径シリンダ室とは反対側に開口する開口部を閉塞するロッド部が突出し、
前記大径ピストン部の前記第1シリンダ室側の受圧面積は、前記大径ピストン部の前記第2シリンダ室側の受圧面積と前記小径ピストン部の前記小径シリンダ室側の受圧面積との和より大きく、
前記液圧回路は、
前記第1シリンダ室と前記第2シリンダ室とを接続又は遮断可能、
前記第1シリンダ室と前記小径シリンダ室とを接続又は遮断可能、
前記液圧源からの作動液の供給先を前記第1シリンダ室と前記小径シリンダ室との間で切り換え可能、
前記液圧源からの作動液の供給先を前記第1シリンダ室とした状態で、前記第2シリンダ室及び前記小径シリンダ室から前記タンクへの作動液の排出を許容又は禁止可能、
に構成されている
型締装置。 A fixed die plate for holding a fixed mold;
A movable die plate that holds a movable mold and is movable in a mold opening and closing direction with respect to the fixed die plate;
A piston that generates a clamping force for clamping the stationary mold and the movable mold, and a clamping cylinder that houses the piston;
A hydraulic pressure source for supplying hydraulic fluid of a predetermined pressure to the mold clamping cylinder;
A tank for storing the hydraulic fluid discharged from the mold clamping cylinder;
A hydraulic circuit for controlling the flow of hydraulic fluid between the hydraulic pressure source, the tank and the clamping cylinder;
Have
The mold clamping cylinder is
A large-diameter cylinder chamber to which hydraulic fluid is supplied when the movable die plate is moved in the mold clamping direction;
A small-diameter cylinder chamber that communicates with the large-diameter cylinder chamber, has a smaller diameter than the large-diameter cylinder chamber, and is supplied with hydraulic fluid when moving the movable die plate in the mold opening direction;
Have
The piston is
The large diameter cylinder chamber is slidable in the large diameter cylinder chamber and divides the large diameter cylinder chamber into a first cylinder chamber opposite to the small diameter cylinder chamber and a second cylinder chamber on the small diameter cylinder chamber side. A piston part;
A small-diameter piston portion projecting from the end surface of the large-diameter piston portion on the small-diameter cylinder chamber side, and capable of sliding the small-diameter cylinder chamber;
Have
From the end surface of the small-diameter cylinder chamber on the small-diameter cylinder chamber side, a rod portion that closes the opening that opens on the opposite side of the small-diameter cylinder chamber from the large-diameter cylinder chamber protrudes,
The pressure receiving area on the first cylinder chamber side of the large diameter piston portion is the sum of the pressure receiving area on the second cylinder chamber side of the large diameter piston portion and the pressure receiving area on the small diameter cylinder chamber side of the small diameter piston portion. big,
The hydraulic circuit is
The first cylinder chamber and the second cylinder chamber can be connected or disconnected,
The first cylinder chamber and the small diameter cylinder chamber can be connected or disconnected,
The supply destination of hydraulic fluid from the hydraulic pressure source can be switched between the first cylinder chamber and the small diameter cylinder chamber.
In a state where the supply destination of the hydraulic fluid from the hydraulic pressure source is the first cylinder chamber , discharge of the hydraulic fluid from the second cylinder chamber and the small diameter cylinder chamber to the tank can be permitted or prohibited.
Clamping device is composed of.
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