JP4115824B2 - Clamping device - Google Patents

Clamping device Download PDF

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Publication number
JP4115824B2
JP4115824B2 JP2002366953A JP2002366953A JP4115824B2 JP 4115824 B2 JP4115824 B2 JP 4115824B2 JP 2002366953 A JP2002366953 A JP 2002366953A JP 2002366953 A JP2002366953 A JP 2002366953A JP 4115824 B2 JP4115824 B2 JP 4115824B2
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Japan
Prior art keywords
mold
movable
mold clamping
clamping cylinder
fixed
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Application number
JP2002366953A
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Japanese (ja)
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JP2004195804A (en
Inventor
敏彰 中野
慎也 伊谷
俊昭 豊島
眞 辻
三郎 野田
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東芝機械株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold clamping device.
[0002]
[Prior art]
In a molding machine such as a die casting machine or an injection molding machine, a molding material such as a resin or a molten metal is injected and filled in a cavity with a mold clamped by a mold clamping device.
As the mold clamping device, for example, a toggle type mold clamping device, a direct pressure type mold clamping device, a composite mold clamping device and the like are known (see Patent Documents 1 to 3).
[0003]
[Patent Document 1]
JP-A-9-193162 [Patent Document 2]
Japanese Utility Model Publication No. 7-50046 [Patent Document 3]
Japanese Examined Patent Publication No. 39-23714
[Problems to be solved by the invention]
By the way, in the mold clamping apparatus, when the molding material is injected and filled into the cavity, the mold clamped by the pressure of the molding material injected into the mold is opened, and the molding material is released from the mold mating surface. It is necessary to prevent eruption. In particular, in a die casting machine, the metal mold is easy to open because of the large inertia of the molten metal as a molding material.
In general, the toggle type mold clamping device and the direct pressure type mold clamping device have a disadvantage that the size of the device is increased.
Furthermore, in the direct pressure type mold clamping device and the composite type mold clamping device, it is necessary to continuously drive the hydraulic cylinder device for mold clamping during the mold clamping operation. Therefore, there is a disadvantage that power consumption is large.
[0005]
The present invention has been made in view of the above-mentioned problems, and its object is to reduce the size, reliably prevent mold opening when a molding material is injected and filled, and enable energy saving operation. Is to provide a simple mold clamping device.
[0006]
[Means for Solving the Problems]
The mold clamping device of the present invention includes a fixed plate that holds a fixed die, a movable plate that is provided so as to be movable with respect to the fixed plate, and that holds a movable die that faces the fixed die, and the movable plate. The mold clamping cylinder is provided on the opposite side of the fixed plate so as to be movable with respect to the fixed plate, and is capable of pressing the movable plate in the mold closing direction. A tie bar fixed to the stationary platen and having a threaded portion at the other end, a half nut provided on the clamping cylinder and meshable with the threaded portion, and between the clamping cylinder and the movable platen. A wedge body that increases the distance between the mold clamping cylinder and the movable plate as it is pushed into the mold, and a drive that drives the wedge body in the direction of pushing between the mold clamping cylinder and the movable plate or in the opposite direction. And the fixed mold and the movable mold are molds. Perform mold closing until the touch, by the driving device to move the wedge member, said wedge to a position of the wedge body distance is predetermined set distance between the front SL clamping cylinder and the movable plate After the positioning, the mold clamping cylinder is moved toward the movable platen, and the wedge body is sandwiched between the mold clamping cylinder and the movable platen, whereby the mold clamping cylinder and the The distance to the movable platen is controlled to the set distance, and after the mold closing and the control to the set distance is completed, the half nut is closed and the half nut and the screw portion are meshed,
In a state where the half nut and the threaded portion are engaged, the movable plate is pressed toward the fixed plate by the mold clamping cylinder, and the fixed die and the movable die are applied with a force according to the extension of the tie bar. And the wedge body is pushed between the mold clamping cylinder and the movable mold according to the extension of the tie bar, and then the pressure applied by the mold clamping cylinder is released.
[0007]
Preferably, the mold closing and the control to the set distance are performed in parallel.
[0009]
In the present invention, when the mold clamping cylinder is driven in a state where the fixed mold and the movable mold are in contact with each other, the movable platen is pressed toward the fixed platen, and the fixed die and the movable die are applied with a force according to the extension of the tie bar. And are clamped. When the tie bar is extended, the movable platen and the mold clamping cylinder are in a relative positional relationship corresponding to the extension of the tie bar. This relative positional relationship is locked by a lock mechanism having a wedge body. This reliably prevents mold opening when the molding material is injected and filled.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a configuration of a mold clamping device according to an embodiment of the present invention.
A mold clamping device 1 shown in FIG. 1 includes a fixed mold 2, a fixed platen 3, a movable mold 4, a movable plate 5, a tie bar 6, a mold opening / closing cylinder 10, a mold clamping cylinder 15, and a lock mechanism. 20, a half nut 30, a half nut driving cylinder 31, a moving cylinder 40, and a position detector 50.
[0011]
The fixed mold 2 is held by a fixed platen 3.
The fixed platen 3 is fixed on a base (not shown).
The movable mold 4 is held by the movable platen 5 so as to face the fixed mold 2.
The movable platen 5 is provided so as to be movable in directions indicated by a mold opening direction A1 and a mold closing direction A2 that approach and separate from the fixed platen 3 on the base to which the fixed platen 3 is fixed.
[0012]
By closing the fixed mold 2 and the movable mold 4, a cavity (not shown) is formed between the fixed mold 2 and the movable mold 4. The molten metal is injected and filled in the cavity by an injection device (not shown) provided on the back side of the fixed mold 2.
[0013]
The mold opening / closing cylinder 10 is fixed to the stationary platen 3. The tip of the piston rod 11 provided in the mold opening / closing cylinder 10 is connected to the movable platen 5.
The mold opening / closing cylinder 10 is driven by, for example, hydraulic pressure, and the movable platen 5 moves in the mold opening direction A1 and the mold closing direction A2 by expansion and contraction of the piston rod 11.
[0014]
A plurality of tie bars 6 are provided, one end portion is fixed to the stationary platen 3, and the other end is formed with a threaded portion 6 a that meshes with the half nut 30. The tie bar 6 penetrates the movable platen 5.
[0015]
The mold clamping cylinder 15 is disposed on the back surface 5b side of the movable platen 5 so as to be movable toward and away from the movable platen 5 indicated by arrows B1 and B2.
The mold clamping cylinder 15 includes a piston 16, and when the hydraulic oil is supplied to the mold clamping cylinder 15 from a hydraulic pump (not shown), the piston 16 can press the back surface 5 b of the movable platen 5 in the mold closing direction A <b> 2. ing.
[0016]
The half nut 30 is provided in the mold clamping cylinder 15 so as to be able to mesh with a threaded portion 6 a formed on the tie bar 6. The mold clamping cylinder 15 and the tie bar 6 are coupled by the half nut 30 meshing with the threaded portion 6 a of the tie bar 6.
The half nut driving cylinder 31 is provided in the mold clamping cylinder 15. By driving the half nut driving cylinder 31, the half nut 30 meshes with the threaded portion 6 a of the tie bar 6.
[0017]
The lock mechanism 20 includes a movable wedge member 21, a fixed wedge member 22, and a cylinder 23. As will be described later, the lock mechanism 20 locks the relative position between the movable platen 5 and the mold clamping cylinder 15 during mold clamping. As many lock mechanisms 20 as necessary are provided.
The movable wedge member 21 is connected to the piston rod 23a of the cylinder 23, and is held so as to be movable in the backward direction C1 and the pushing direction C2 perpendicular to the moving direction of the movable platen 5. The movable wedge member 21 has a back surface 21b that contacts the end surface 15f of the mold clamping cylinder 15 and an inclined surface 21f that contacts the fixed wedge member 22 and is inclined at a predetermined angle. The back surface 21b is a surface perpendicular to the moving direction of the movable platen 5, and the inclined surface 21f is inclined at a predetermined angle with respect to the back surface 21b.
[0018]
The fixed wedge member 22 has a back surface 22b fixed to the movable platen 5 and includes an inclined surface 22f inclined at the same angle as the inclined surface 21f of the movable wedge member 21. The inclined surface 22f faces the inclined surface 21f of the movable wedge member 21 so as to be able to come into contact therewith. The inclination angle of the inclined surface 21f of the movable wedge member 21 and the inclined surface 22f of the fixed wedge member 22 is such that when a force acts between the movable wedge member 21 and the fixed wedge member 22 during mold clamping, The angle at which the member 21 does not move in the backward direction C1 is set.
[0019]
The cylinder 23 is connected to the mold clamping cylinder 15 by a fixing member 24. By driving the cylinder 23, the movable wedge member 21 is moved and positioned in the backward direction C1 and the pushing direction C2.
The actuator that moves the movable wedge member 21 is not limited to the cylinder 23 and may be any actuator that can position the movable wedge member 21 in the backward direction C1 and the pushing direction C2, such as a slide mechanism including a servo motor.
[0020]
The moving cylinder 40 is fixed to the mold clamping cylinder 15. A piston rod 40 a provided in the moving cylinder 40 is connected to the movable platen 5. The clamping cylinder 15 moves relative to the movable platen 5 by driving the moving cylinder 40 and extending and contracting the piston rod 40a.
[0021]
The position detector 50 detects the distance T between the mold clamping cylinder 15 and the movable platen 5. As the position detector 50, for example, a linear scale is used.
The mold clamping device 1 having the above configuration is comprehensively controlled by a control device (not shown).
[0022]
Next, an example of operation | movement of the mold clamping apparatus 1 of the said structure is demonstrated with reference to the flowchart shown to FIG. 2 and FIG.
2 and 3 show a control procedure of the mold clamping device 1 by a control device (not shown).
As shown in FIG. 2, first, before starting the casting cycle, it is confirmed whether preparation for the casting cycle is completed (step ST1).
If the preparation has not been completed, the mold thicknesses Dt 1 and Dt 2 of the fixed mold 2 and the movable mold 4 shown in FIG. 1 are input to the control device (step ST5). Incidentally, preparation for the casting cycle is omitted also present other than the input of the mold thickness Dt 1 and Dt 2 is described.
[0023]
In the control device, the set distance TA between the mold clamping cylinder 15 and the movable platen 5 when performing mold clamping is calculated from the inputted mold thicknesses Dt 1 and Dt 2 and the dimensions of the tie bar 6 and the fixed mold 2 Then, the mold opening distance Ls when the movable mold 4 is opened is calculated (step ST6).
[0024]
When the calculation of the distance TA and the mold opening distance Ls is completed, the casting cycle is started (step ST2).
First, the mold opening / closing cylinder 10 is driven, and the movable platen 5 is advanced in the mold closing direction A2 as shown in FIG. 4 (step ST3). The movable platen 5 is moved forward in the mold closing direction A2, and the movement of the movable platen 5 is stopped at a position where the movable die 4 contacts the fixed die 2 (step ST4). As a result, the mold is closed.
In parallel with mold closing by driving the mold opening / closing cylinder 10, control is performed such that the distance T between the mold clamping cylinder 15 and the movable platen 5 becomes the calculated set distance TA (step ST7).
[0025]
In the operation of controlling the distance T between the mold clamping cylinder 15 and the movable platen 5 to the set distance TA, first, the position of the movable wedge member 21 that becomes the set distance TA calculated by the distance T is calculated. That is, in the state where the inclined surface 21f of the movable wedge member 21 and the inclined surface 22f of the fixed wedge member 22 are in contact, the distance between the back surface 21b of the movable wedge member 21 and the back surface 21b of the fixed wedge member 22 becomes the set distance TA. Thus, the position of the movable wedge member 21 is calculated. Then, the cylinder 23 is driven and controlled to move the movable wedge member 21 in the pushing direction C2 to perform positioning.
From this state, when the moving cylinder 40 is driven and the mold clamping cylinder 16 is moved toward the movable platen 5, the inclined surface 21f of the movable wedge member 21 comes into contact with the inclined surface 22f of the fixed wedge member 22. At the position where the inclined surface 21f contacts the inclined surface 22f, the distance T between the mold clamping cylinder 15 and the movable platen 5 becomes the set distance TA.
[0026]
Next, the half nut driving cylinder 31 is driven to close the half nut 30 (step ST8). As a result, the half nut 30 meshes with the threaded portion 6 a of the tie bar 6, and the mold clamping cylinder 15 and the stationary platen 3 are connected by the tie bar 6.
[0027]
Next, hydraulic oil is supplied to the mold clamping cylinder 15 to perform mold clamping (step ST9).
When the piston 16 of the clamping cylinder 15 presses the back surface of the movable platen 5 toward the fixed platen 3 side, the tie bar 6 extends due to elastic deformation as shown in FIG. When the extension of the tie bar 6 is ΔL, the distance T between the mold clamping cylinder 15 and the movable platen 5 is TA + ΔL. The mold clamping force is calculated based on the distance T detected by the position detector 50, and it is confirmed whether a desired mold clamping force is generated by the mold clamping cylinder 15.
[0028]
When the tie bar 6 extends, a gap is generated between the back surface 21 b of the movable wedge member 21 and the end surface 15 f of the mold clamping cylinder 15. The movable wedge member 21 is pushed into the generated gap (step ST10).
[0029]
After the movable wedge member 21 is pushed into the gap between the back surface 21b of the movable wedge member 21 and the end surface 15f of the clamping cylinder 15 generated by the extension of the tie bar 6, supply of hydraulic oil to the clamping cylinder 15 by the hydraulic pump is stopped. (Step ST11). By stopping the driving of the hydraulic pump, the pressing of the movable platen 5 by the piston 16 of the clamping cylinder 15 is stopped, and a force corresponding to the extension of the tie bar 6 acts between the movable wedge member 21 and the fixed wedge member 22. To do. Since a large frictional force is generated between the inclined surface 21f of the movable wedge member 21 and the inclined surface 22f of the fixed wedge member 22, the position of the mold clamping cylinder 15 and the movable platen 5 is in a state where the distance T is TA + ΔL. Locked by. Since the mold clamping state can be maintained without driving the mold clamping cylinder 15, the power consumption of the hydraulic pump can be suppressed.
[0030]
Next, the molten metal is injected and filled into the cavity formed between the fixed mold 2 and the movable mold 4 by an injection device (not shown) (step ST12). The injection and filling of the molten metal usually includes an injection process for controlling the injection speed and a pressure increasing process for controlling the injection pressure of the molten metal filled in the cavity.
In the injection process, when the injection speed is switched from low speed to high speed, the molten metal that has been injected into the cavity at a low speed is rapidly injected at a high speed. Acts and a force to open the mold acts. However, the mold opening is reliably prevented by the wedge effect of the movable wedge member 21 and the fixed wedge member 22.
[0031]
It is determined whether injection and filling of the molten metal into the cavity are completed (step ST13). If completed, supply of hydraulic oil to the mold clamping cylinder 15 by the hydraulic pump is resumed (step ST14).
When the supply of hydraulic oil to the mold clamping cylinder 15 by the hydraulic pump is resumed, the movable platen 5 is pressed again by the piston 16 of the mold clamping cylinder 15. Thereby, the movable wedge member 21 becomes movable. The movable wedge member 21 is retracted in the retracting direction C1 (step ST15). In this state, the tie bar 6 is in an extended state.
[0032]
Next, the supply of hydraulic oil to the mold clamping cylinder 15 is stopped (step ST16). When the supply of hydraulic oil to the mold clamping cylinder 15 is stopped, the pressing of the movable platen 5 by the piston 16 is stopped, and the extended tie bar 6 is restored to the original length. As a result, the mold clamping force acting on the movable mold 4 and the fixed mold 2 is released.
[0033]
Next, the half nut driving cylinder 31 is driven to open the half nut 30 (step ST17). Thereby, the half nut 30 is released from the threaded portion 6a of the tie bar 6, and the connection between the mold clamping cylinder 15 and the stationary platen 3 is released.
[0034]
Next, the mold opening / closing cylinder 10 is driven, the movable platen 5 is retracted in the mold opening direction A1, and the mold is opened (step ST18). The movable mold 4 moves to a position separated from the fixed mold 2 by a mold opening distance Ls.
In this state, the cast product is taken out by extruding it from the mold with an unillustrated push pin (step ST19).
Thereafter, operations such as cleaning of the mold and application of a release agent to the mold are performed, and it is determined whether or not to continue the casting cycle (step ST20). Similar processing is repeated.
[0035]
As described above, according to the present embodiment, the distance T between the movable platen 5 and the mold clamping cylinder 10 is defined by positioning the movable wedge member 21 of the lock mechanism 20. Therefore, by increasing the positioning accuracy of the movable wedge member 21, the distance T between the movable platen 5 and the mold clamping cylinder 10 can be accurately set to the set distance TA.
Further, according to the present embodiment, the movable platen 5 is directly pressed by the mold clamping cylinder 15 to extend the tie bar 6 to perform mold clamping, and the lock mechanism 20 moves the movable platen 5 and the mold clamping cylinder 15 in the mold clamping state. Lock relative position with. After locking the relative position, the pressing of the movable platen 5 by the mold clamping cylinder 15 is stopped. Thereby, power consumption for driving the mold clamping cylinder 15 can be suppressed.
Further, according to the present embodiment, since the operation for adjusting the distance T between the movable platen 5 and the mold clamping cylinder 10 and the mold closing operation can be performed in parallel, the cycle time can be shortened.
[0036]
【The invention's effect】
According to the present invention, it is possible to obtain a mold clamping device that is reduced in size, can reliably prevent mold opening when a molding material is injected and filled, and can perform energy saving operation.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a mold clamping device according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining an example of the operation of the mold clamping device according to the embodiment of the present invention.
FIG. 3 is a flowchart for explaining the operation following FIG. 2;
FIG. 4 is a cross-sectional view showing a state where the mold clamping device is closed.
FIG. 5 is a cross-sectional view showing a state where the mold clamping device is clamped.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mold clamping apparatus 2 ... Fixed mold 3 ... Fixed platen 4 ... Movable die 5 ... Movable platen 6 ... Tie bar 10 ... Mold opening / closing cylinder 15 ... Clamping cylinder 20 ... Lock mechanism 30 ... Half nut 31 ... Half nut drive Cylinder 40 ... Moving cylinder 50 ... Position detector

Claims (2)

  1. A fixed platen for holding a fixed mold;
    A movable platen movably provided with respect to the fixed platen and holding a movable die facing the fixed die;
    A mold clamping cylinder provided on the opposite side of the movable plate to the fixed plate so as to be movable with respect to the fixed plate, and capable of pressing the movable plate in a mold closing direction;
    A tie bar penetrating the movable plate, having one end fixed to the fixed plate and the other end formed with a thread;
    A half nut provided in the mold clamping cylinder and meshable with the thread portion;
    A wedge shaped to increase the distance between the mold clamping cylinder and the movable plate as it is pushed between the mold clamping cylinder and the movable plate;
    Drive means for driving the wedge body in a direction of pushing in between the mold clamping cylinder and the movable plate or in the opposite direction;
    Close the mold until the fixed mold and the movable mold come into contact with the mold,
    After the wedge member is moved, the distance between the front SL clamping cylinder and the movable plate has positioning the wedge member to a position of the wedge body as a predetermined set distance by the drive means, the mold clamping cylinder Is moved toward the movable platen, and the wedge body is sandwiched between the mold clamping cylinder and the movable platen, whereby the distance between the mold clamping cylinder and the movable platen is set. Control to distance,
    After the mold closing and the control to the set distance is completed, the half nut is closed to mesh the half nut and the threaded portion,
    In a state where the half nut and the threaded portion are engaged, the movable plate is pressed toward the fixed plate by the mold clamping cylinder, and the fixed die and the movable die are applied with a force according to the extension of the tie bar. And mold clamping
    A mold clamping device that releases the pressure applied by the mold clamping cylinder after the wedge body is pushed between the mold clamping cylinder and the movable mold in accordance with the extension of the tie bar.
  2. The mold clamping apparatus according to claim 1, wherein the mold closing and the control to the set distance are performed in parallel.
JP2002366953A 2002-12-18 2002-12-18 Clamping device Active JP4115824B2 (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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JP4115824B2 true JP4115824B2 (en) 2008-07-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424649A (en) * 2016-08-12 2017-02-22 秦皇岛信越智能装备有限公司 Wedge block locking device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101716669B (en) * 2009-12-15 2012-05-23 江苏大学 Liquid forging device of multisection mold surface for universal oil hydraulic press
JP5682488B2 (en) 2011-07-12 2015-03-11 株式会社豊田自動織機 Clamping device
JP5889630B2 (en) * 2011-12-26 2016-03-22 住友重機械工業株式会社 Injection molding machine
CN106890975A (en) * 2017-04-26 2017-06-27 苏州三基铸造装备股份有限公司 New and effective die fixture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424649A (en) * 2016-08-12 2017-02-22 秦皇岛信越智能装备有限公司 Wedge block locking device

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