KR20070022223A - Mold clamping device and mold clamping method - Google Patents

Abstract

An object of the present invention is to provide a clamping device 10 that can sufficiently increase the accuracy of mold opening and closing.

A first fixing member on which the stationary mold 15 is mounted, a first movable member on which the movable mold 16 is mounted, and a first movable member on which the movable mold 16 is mounted; It has a 2nd movable member, the clamping force transmission member which connects the said 1st, 2nd movable member, and the mold opening / closing drive part which mold-opens by opening and closing the said 1st movable member. At least a part of the mold opening / closing drive unit and the clamping force transmitting member overlap each other.

Since the mold opening and closing drive part and the mold driving part are independent, the mold opening and closing drive part and the first movable member can be directly connected. Therefore, the precision of mold opening and closing can be made high enough.

Clamping, precision, movable member, clamping force, overlap

Description

Mold clamping device and mold clamping method

The present invention relates to a clamping apparatus and a clamping method.

Conventionally, a molding machine, such as an injection molding machine, includes an injection device, a mold device, and a mold clamping device, in which resin is injected from an injection nozzle of an injection device, filled into a cavity space of a mold device, and solidified to obtain a molded product. . The mold apparatus is provided with a stationary mold and a movable mold, and the mold clamping device is operated by moving the mold apparatus to advance and retract the movable mold with respect to the stationary mold. And mold opening can be performed.

The clamping device includes a fixed platen on which the fixed mold is mounted, a movable platen on which the movable mold is mounted, an electric motor, a ball screw shaft connected to an output shaft of the motor, and a ball nut screwed with the ball screw shaft. A ball screw comprising a ball screw, a cross head connected to the ball nut, a toggle mechanism provided between the cross head and the movable platen, and advancing the cross head by driving the motor, thereby extending the toggle mechanism and extending the mold mechanism. And shape can be performed.

By the way, in the clamping apparatus of the said structure, since a toggle mechanism is used to generate a clamping force, a bending moment acts on a movable platen, and distortion arises in the metal mold | die mounting surface in a movable platen.

In addition, since the mold is formed by extending the toggle mechanism, it becomes difficult to control the mold force.

Therefore, a clamping device including an electric motor and an electromagnet, using the torque of the motor for the operation of mold closing and mold opening and the suction force of the electromagnet for the operation of the mold is provided (see Patent Document 1, for example).

In this mold clamping device, a rear platen is provided at a predetermined interval from the stationary platen, and the movable platen is installed along the tie bar provided between the stationary platen and the rear platen so that the movable platen can move back and forth. Then, the electromagnet is fixed to the rear plate of the rear platen, the suction plate is installed at the rear of the rear platen to advance and retreat, and a link mechanism is installed between the suction plate and the movable platen, and the link mechanism is rotated. The motor is driven to expand and retract the movable platen to perform mold opening and closing.

Therefore, after the mold closing is performed by driving the motor and extending the link mechanism, the mold can be formed by driving the electromagnet to adsorb the suction plate. In this case, since the electromagnet is used to generate the clamping force, the bending moment does not act on the movable platen, and distortion is not generated on the mold mounting surface of the movable platen. In addition, the clamping force can be easily controlled.

[Patent Document 1] Japanese Patent No. 3190600

[Initiation of invention]

[Problem to Solve Invention]

However, in the conventional mold clamping device, it is necessary to provide a plurality of parts between the motor and the movable platen, and the positional accuracy of the movable platen cannot be sufficiently high.

An object of the present invention is to provide a mold clamping apparatus and a mold clamping method which can solve the problems of the conventional mold clamping apparatus and can sufficiently increase the accuracy of mold opening and closing.

[Means for solving the problem]

To this end, in the mold clamping apparatus of the present invention, there is provided a first fixing member on which a fixed mold is mounted, a first movable member on which a movable mold is mounted to face the first fixing member, and a first movable member of the first movable member. It has a 2nd movable member which advances and retreats by advancing, the clamping force transmission member which connects the said 1st, 2nd movable member, and the mold opening / closing drive part which performs mold opening and closing by advancing and retracting said 1st movable member.

At least a part of the mold opening / closing drive unit and the clamping force transmitting member overlap each other.

In another mold clamping apparatus of the present invention, the mold opening and closing driving portion and the clamping force transmitting member have the same axis.

In still another clamping device of the present invention, the mold opening and closing drive portion and the clamping force transmitting member are asymmetrically provided to each other.

In still another clamping device of the present invention, the mold opening and closing drive unit is provided along a guide member independent of the tie bar.

In still another clamping device of the present invention, a second fixing member is further provided between the first and second movable members. A mold driving section for generating a clamping force by the electromagnet is provided on the second fixing member and the second movable member.

In still another clamping device of the present invention, the clamping force transmitting member extends through the second fixing member.

In still another clamping device of the present invention, the clamping force transmitting member is a linking device provided between the second fixing member and the first movable member.

In still another mold clamping apparatus of the present invention, the mold opening and closing drive unit is a linear motor.

In still another mold clamping apparatus of the present invention, a mold thickness adjustment driving portion is further provided on the first movable member.

In still another clamping device of the present invention, a mold thickness adjustment driving part is further provided in the second fixing member.

In still another mold clamping apparatus of the present invention, the mold opening and closing drive unit is provided between at least one of the first and second movable members and the frame.

In still another mold clamping apparatus of the present invention, a movable member support portion is further provided between the mold opening and closing drive portion and at least one of the first and second movable members.

In the mold clamping method of the present invention, the first fixing member on which the stationary mold is mounted, the first fixing member is installed to face the first fixing member, and the first movable member on which the movable mold is mounted, and the first movable member is moved forward and backward according to the advancement and retraction of the first movable member. A mold clamping force transmission member for connecting the second movable member, the first and second movable members, a mold opening and closing driver for advancing and retracting the first movable member, and a mold for advancing the second movable member to mold. The mold opening / closing drive section and the clamping force transmitting member are adapted to be applied to a clamping device in which at least a portion thereof overlaps.

Then, mold closing and mold opening are performed by driving the mold opening and closing drive unit, and mold molding is performed by driving the mold driving unit.

[Effects of the Invention]

According to the present invention, in the mold clamping device, a first fixing member on which a fixed mold is mounted, a first movable member on which a movable mold is mounted, provided to face the first fixing member, and a retraction of the first movable member And a second movable member advancing and receding, a clamp force transmitting member connecting the first and second movable members, and a mold opening / closing driving unit for advancing and opening the first movable member.

At least a part of the mold opening / closing drive unit and the clamping force transmitting member overlap each other.

In this case, the overall length of the mold clamping device can be shortened.

In addition, since the mold opening and closing drive unit and the mold body driving unit are independent, the mold opening and closing drive unit and the first movable member can be directly connected.

Therefore, the precision of mold opening and closing can be made high enough.

1 is a view showing a state at the time of mold closing of the mold apparatus and the mold clamping apparatus in the first embodiment of the present invention.

Fig. 2 is a view showing a state at the start of mold of the mold apparatus and the mold clamping apparatus in the first embodiment of the present invention.

3 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus according to the second embodiment of the present invention.

Fig. 4 is a diagram showing a state at the time of mold closing of the mold apparatus and the mold clamping apparatus in the third embodiment of the present invention.

Fig. 5 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the fourth embodiment of the present invention.

Fig. 6 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along line X-X in FIG. 6.

8 is a cross-sectional view taken along the line Y-Y in FIG. 6.

9 is a cross-sectional view taken along the line Z-Z in FIG. 6.

Fig. 10 is a diagram showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the sixth embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along the line A-A of FIG.

12 is a cross-sectional view taken along line B-B in FIG. 10.

FIG. 13 is a sectional view taken along the line C-C in FIG.

Fig. 14 is a diagram showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the seventh embodiment of the present invention.

* Explanation of Codes *

10: mold clamping device

11: fixed platen

12: movable platen

13: rear platen

15: Fixed mold

16: movable mold

22: adsorption plate

28, 128: linear motor

39, 139, 239: rod

Best Mode for Carrying Out the Invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the present embodiment, however, the moving direction of the movable platen at the time of mold closing is referred to as the front side, and the moving direction of the movable platen at the time of mold opening is referred to as the rearward side of the mold clamping device. The moving direction of the screw at the time of injection is called front, and the moving direction of the screw at the time of measuring is described as back.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a state at the time of mold closing of a mold apparatus and a mold clamping apparatus in a first embodiment of the present invention. The figure which shows.

In the figure, reference numeral 10 denotes a clamping apparatus, Fr denotes an injection molding machine frame, and Gd is attached to the frame Fr to form a rail, and as a first guide member for guiding and supporting the clamping apparatus 10. Guides (in the drawing, only one of the two guides Gd) and 11 are mounted on the guides Gd and are fixed to the frame Fr and the guides Gd. A stationary platen as a fixing member, provided with a rear platen 13 as a second fixing member at a predetermined interval from the fixing platen 11 and facing the fixing platen 11, and provided as a second fixing member. A tie bar 14 (only two of the four tie bars 14 is shown in the figure) is hypothesized between the tongue 11 and the rear platen 13. However, the rear platen 13 is placed on the guide Gd so that the tie bar 14 can move slightly with respect to the guide Gd as it expands and contracts.

Then, the movable platen 12 as the first movable member is provided in the mold opening and closing direction so as to face the stationary platen 11 along the tie bar 14. To this end, a guide hole (not shown) for penetrating the tie bar 14 is formed at a position corresponding to the tie bar 14 in the movable platen 12.

A first screw portion (not shown) is formed at the front end of the tie bar 14, and the fixing platen 11 and the tie bar 14 screw the first screw portion and the nut n1. It is fixed by bonding. In addition, a guide post 21 serving as a second guide member having a smaller outer diameter than the tie bars 14 protrudes rearward from the rear surface of the rear platen 13 to a predetermined portion behind each of the tie bars 14. In addition, it is formed integrally with the tie bar 14. In addition, a second screw portion (not shown) is formed near the rear surface of the rear platen 13, and the fixing platen 11 and the rear platen 13 screw the second screw portion and the nut n2. Is fixed. In this embodiment, the guide post 21 is formed integrally with the tie bar 14, but the guide post 21 and the tie bar 14 may be formed separately.

In addition, a fixed mold 15 as a first mold is fixed to the fixed platen 11, and a movable mold 16 as a second mold is fixed to the movable platen 12, respectively. The mold apparatus 19 is configured by the mold 16. As the movable platen 12 moves forward and backward, the stationary mold 15 and the movable mold 16 are separated from each other, and mold closing, mold clamping, and mold opening are performed.

Here, as the mold is performed, a cavity space (not shown) is formed between the stationary mold 15 and the movable mold 16, and shown as a molding material injected from the injection nozzle 18 of the injection apparatus 17. Unfilled resin is filled in the cavity space. In this case, one cavity space is formed by the stationary mold 15 and the movable mold 16, and molding is performed by the mold apparatus 19 one by one.

After the resin is filled in the cavity space, the mold apparatus 19 is cooled, and when the resin in the cavity space is cooled and solidified, mold opening is performed. At this time, the ejector device 55 provided on the rear surface of the movable platen 12 is operated, and the ejector pin (not shown) protrudes from the movable mold 16, so that the molded article can be taken out.

Then, the suction plate 22 serving as the second movable member provided in parallel with the movable platen 12 is provided so as to be able to move forward and backward along the respective guide posts 21 behind the rear platen 13. Guided by the post 21. However, the suction plate 22 is provided with a guide hole 23 for penetrating the guide post 21 at a position corresponding to each guide post 21. This guide hole 23 is opened to the rear platen 13 side, is opened to the large diameter part 24 which accommodates the ball nut n2, and the back side of the suction plate 22, and the guide post 21 and The small diameter part 25 which has a sliding surface which slides is provided. In the present embodiment, the suction plate 22 is guided by the guide post 21, but the suction plate 22 can be guided by the guide Gd as well as the guide post 21.

By the way, in order to advance and retract the movable platen 12, the linear motor 28 as the first drive unit and the drive unit for the mold opening and closing is provided between the movable platen 12 and the frame Fr. Independent of the bar 14, it is provided along the guide Gd. The linear motor 28 includes a stator 29 as a first drive element provided on the frame Fr in parallel with the guide Gd and corresponding to a moving range of the movable platen 12. And a mover 31 at a lower end of the movable platen 12, facing the stator 29 and provided as a second drive element provided over a predetermined range.

The movable element 31 protrudes toward the stator 29 and further includes a core 34 on which a plurality of magnetic pole teeth 33 are formed at a predetermined pitch, and a coil 35 wound around and mounted on each magnetic pole tooth 33. ). However, the magnetic pole teeth 33 are formed parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. The stator 29 has a core (not shown) and a permanent magnet (not shown) formed so as to extend on the core, and the permanent magnet alternates each magnetic pole of the N pole and the S pole (not shown). Also, it is formed by magnetizing at the same pitch as the magnetic pole teeth 33.

Therefore, when the linear motor 28 is driven by supplying a predetermined current to the coil 35, the mover 31 is moved back and forth, whereby the movable platen 12 is moved back and forth to perform mold closing and mold opening. have.

When the length of the stator 29 is Lp, the length of the movable element 31 is Lm, and the stroke of the movable platen 12 is Lst, the length Lm is a linear motor ( 28 is set corresponding to the maximum propulsion force, and the length Lp is

Lp> Lm + Lst

Becomes

That is, the movable element 31 projects the front end forward by a predetermined amount from the front end surface of the movable platen 12 so as to secure the length Lm, and the rear end is moved. And protrudes rearward from the rear end face of the movable platen 12 by a predetermined amount. The stator 29 protrudes the front end slightly forward than the front end of the core 34 when the movable platen 12 and the movable mold 16 are in the forward limit position. The movable platen 12 and the movable mold 16 are installed so as to project slightly behind the rear end of the core 34 when the movable platen 12 and the movable mold 16 are placed in the retreat limit position.

However, in this embodiment, although the permanent magnet is provided in the stator 29 and the coil 35 is provided in the mover 31, the coil may be provided in the stator and the permanent magnet may be provided in the mover. In this case, as the linear motor 28 is driven, the coil does not move, so that wiring for supplying power to the coil can be easily performed.

By the way, when the movable platen 12 is advanced and the movable mold 16 contacts the stationary mold 15, mold closing is performed, and then mold molding is performed. Then, in order to perform the mold clamping, an electromagnet unit 37 as the second driver portion and the mold driver is provided between the rear platen 13 and the suction plate 22. At the time of mold closing and mold opening, the suction plate 22 is moved forward and backward in linkage with the advancement and fall of the movable platen 12, and the clamping force generated by the electromagnet unit 37 is transferred to the movable platen 12 at the time of mold clamping. In order to transmit, the rod 39 as a clamping force transmitting member connecting the movable platen 12 and the suction plate 22 is capable of moving forward and overlapping the linear motor 28 at least partially in the axial direction. Is installed. In addition, the linear motor 28 and the rod 39 are asymmetrical to each other.

Here, the clamping device 10 is provided by the stationary platen 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the rod 39, and the like. ) Is configured.

The electromagnet unit 37 is composed of an electromagnet 49 as a first drive member provided on the rear platen 13 side, and an adsorption portion 51 as a second drive member provided on the suction plate 22 side. The adsorption | suction part 51 surrounds the said rod 39 in the predetermined part of the front end surface of the said adsorption plate 22, in this Example, and the adsorption plate 22, and opposes the electromagnet 49. As shown in FIG. Is formed on the part. In addition, a predetermined portion of the rear surface of the rear platen 13, in this embodiment, the two grooves 45 are formed parallel to each other so as to extend in the horizontal direction, slightly above and below the rod 39. The yoke 47 is formed at the other portion of the core 46 having a rectangular shape between the grooves 45. The coil 48 is wound around the core 46 to form the electromagnet 49.

Here, the core 46, the yoke 47, and the suction plate 22 are formed by laminating a thin plate made of a ferromagnetic material to form an electronic laminated steel sheet.

In the present embodiment, although the electromagnet 49 is formed separately from the rear platen 13 and the adsorption portion 51 is formed separately from the adsorption plate 22, the electromagnet is used as part of the rear platen 13. The adsorption part can also be formed as part of the adsorption plate 22.

Therefore, in the electromagnet unit 37, when the current is supplied to the coil 48, the electromagnet 49 is driven to adsorb the adsorption unit 51 to generate the clamp force.

The rod 39 is connected to the suction plate 22 at the rear end and connected to the movable platen 12 at the front end. As the movable platen 12 moves forward during mold closing, The adsorbent plate 22 is advanced to advance, and the movable platen 12 is retracted as the movable platen 12 retracts at the time of mold opening, and the adsorption plate 22 is retreated.

To this end, a hole 41 for penetrating the rod 39 in the center portion of the rear platen 13, a hole 42 for penetrating the rod 39 in the center portion of the suction plate 22 A bearing member Br1, such as a bush, which is formed so as to face the opening of the front end of the hole 41 to slidably support the rod 39, is provided. In addition, a screw 43 is formed at the rear end of the rod 39, and the screw 43 and the nut 44 rotatably supported with respect to the suction plate 22 are screwed together.

In the present embodiment, as described above, one cavity space is formed in the mold apparatus 19, and molding is performed one by one, so that the cavity space is almost at the center of the movable platen 12. Is formed. Therefore, since the ejector device 55 is also preferably installed at the center portion of the rear surface of the movable platen 12, a space 56 for accommodating the ejector device 55 is formed in the rod 39. .

However, at the time when mold closing is completed, the suction plate 22 is close to the rear platen 13, and a predetermined gap δ is formed between the rear platen 13 and the suction plate 22, and this gap is formed. If δ becomes too small or too large, the adsorption portion 51 cannot be sufficiently adsorbed, and the clamping force becomes small. In addition, the optimum gap δ changes as the thickness of the mold apparatus 19 changes.

Thus, a gear of large diameter, not shown, is formed on the outer circumferential surface of the nut 44, and the adsorption plate 22 is provided with a mold thickness adjustment motor, not shown, as a third drive portion and as a mold thickness adjustment drive portion. A small diameter gear (not shown) mounted on an output shaft of the mold thickness adjusting motor and a gear formed on the outer circumferential surface of the nut 44 are engaged.

Then, the mold thickness adjustment motor is driven in correspondence with the thickness of the mold apparatus 19, and the nut 44 is rotated by a predetermined amount with respect to the screw 43, whereby the rod 39 with respect to the suction plate 22 The position is adjusted, and the positions of the suction plate 22 with respect to the stationary platen 11 and the movable platen 12 are adjusted, so that the gap δ can be adjusted to the optimal value set.

Here, the mold thickness adjusting device is configured by the mold thickness adjusting motor, the gears, the nuts 44, the rods 39, and the like. Moreover, each gear comprises the rotation transmission part which transmits the rotation of the mold thickness adjustment motor to the nut 44. As shown in FIG. Then, the nut 44 and the screw 43 constitute a motion direction converting portion, and in this motion direction converting portion, the rotational movement of the nut 44 is converted into a straight motion of the rod 39. In this case, the first conversion element is constituted by the nut 44 and the second conversion element is constituted by the screw 43.

Since the linear motor 28 overlaps with the rod 39 at an offset position below the rod 39, the linear motor 28 can shorten the overall length of the clamping device 10. In addition, since the linear motor 28 and the rod 39 are overlapped, and the linear motor 28 and the suction plate 22 are not overlapped, the adsorption area of the electromagnet 49 can be secured, further. It can generate large clamping force.

Next, operation | movement of the clamping apparatus 10 of the said structure is demonstrated.

With the replacement of the mold apparatus 19, when a new mold apparatus 19 is mounted, first, the distance between the suction plate 22 and the movable platen 12 is changed in correspondence with the thickness of the mold apparatus 19. , Mold thickness adjustment is performed. In this mold thickness adjustment, the stationary mold 15 and the movable mold 16 are attached to the stationary platen 11 and the movable platen 12, respectively, and then the movable mold 16 is retracted to form a mold. The device 19 is left open.

Subsequently, in the distance adjusting step, the linear motor 28 is driven to make the mold touch by bringing the movable mold 16 into contact with the fixed mold 15. However, the clamping force does not occur at this time. In this state, the nut 44 is rotated by driving the mold thickness adjusting motor to adjust the distance between the rear platen 13 and the suction plate 22, that is, the gap δ, to be a preset value.

At this time, the rear platen 13 so that the coil 48 does not break even when the rear platen 13 and the suction plate 22 contact each other, and the coil 48 does not protrude from the surface of the rear platen 13. ) Coil 48 is embedded. In this case, the surface of the rear platen 13 functions as a stopper for preventing damage to the coil 48. However, when the coil 48 protrudes from the surface of the rear platen 13, between the rear platen 13 and the suction plate 22, for example, the suction plate 22 in the rear platen 13. On the surface opposite to the rear platen 13 in the suction plate 22, a stopper for preventing contact (not shown) is provided, and the rear platen 13 and the suction plate 22 come into contact with each other to form a coil. Do not break (48).

Thereafter, the mold opening and closing processing means of the control unit (not shown) performs mold opening and closing processing, and supplies current to the coil 35 in the state of FIG. 2 at the time of mold closing. Subsequently, the linear motor 28 is driven, the movable platen 12 is advanced, and as shown in FIG. 1, the movable mold 16 abuts against the stationary mold 15. At this time, an optimum gap δ is formed between the rear platen 13 and the suction plate 22, that is, between the electromagnet 49 and the suction part 51. However, the force required for mold closing becomes small enough compared with the clamping force.

Subsequently, the mold opening and closing processing means supplies a current to the coil 48 in the state of FIG. 1 at the time of clamping, and adsorbs the adsorption portion 51 by the adsorption force of the electromagnet 49. Thereby, the clamping force is transmitted to the movable platen 12 via the suction plate 22 and the rod 39, and the mold is carried out. In addition, in order to form the predetermined gap δ, a gap adjusting stopper (not shown) can be provided. Moreover, a contact prevention stopper can also be provided on frame Fr.

Further, the clamp force is detected by a load detector not shown, and the detected clamp force is sent to the controller, in which the current supplied to the coil 48 is adjusted so that the clamp force is a set value, thereby controlling feedback. Is performed. In the meantime, the molten resin in the injection apparatus 17 is injected from the injection nozzle 18, and is filled in the said cavity space. However, as the load detector, a load cell provided on the rod 39 may be used, or a sensor for detecting the amount of extension of the tie bar 14 may be used.

When the resin in the cavity space cools and solidifies, the mold opening and closing processing means stops supplying current to the coil 48 in the state of FIG. 1 at the time of mold opening. As a result, the linear motor 28 is driven, the movable platen 12 is retracted, and as shown in FIG. 2, the movable mold 16 is placed at the retreat limit position and mold opening is performed.

Thus, in this embodiment, since the linear motor 28 and the electromagnet unit 37 are provided independently, the positional accuracy at the time of stopping the movable platen 12 can be made high.

Further, the suction plate 22 is advanced by the suction force of the electromagnet 49, and the clamping force is transmitted to the movable mold 16 through the rod 39 and the movable platen 12, so that the clamping device 10 at the time of clamping Can improve the responsiveness and stability.

In addition, since there is no need to use a toggle mechanism to generate the clamping force, a bending moment does not act on the movable platen 12, thereby preventing distortion of the mold mounting surface of the movable platen 12 from occurring. have.

In addition, the rod 39 not only has a function of transmitting the clamping force, but also has a function of adjusting the mold thickness, so that the number of parts of the clamping device 10 can be reduced, thereby simplifying the structure of the clamping device 10. Thus, the mold clamping apparatus 10 can be miniaturized.

In addition, since the clamping is performed by the electromagnet unit 37, the clamping force can be easily controlled by adjusting the current supplied to the coil 48, and the linear plate 28 is used to move the movable platen 12. Since it can advance and retreat, the response and stability of the clamping apparatus 10 can be improved further.

In addition, the mold thickness adjusting device may be provided in one place, and it is not necessary to install each of the tie bars 14, so that the cost of the mold clamping device 10 can be reduced. Moreover, since there are few members moved when adjusting mold thickness, a motor with a small capacity can be used as a motor for mold thickness adjustment. Therefore, not only the mold clamping device 10 can be miniaturized, but also the precision of adjusting mold thickness can be made high.

In addition, since the stator 29 and the rod 39 overlap each other in the axial direction, the axial dimension of the mold clamping device 10 can be reduced. Therefore, the overall length of the mold clamping apparatus 10 can be shortened, and the mold clamping apparatus 10 can be further miniaturized.

In addition, since the linear motor 28 and the electromagnet unit 37 are independent, the linear motor 28 and the movable platen 12 can be directly connected. Therefore, the precision of mold opening and closing can be made high enough.

In addition, since the rod 39 is provided at the central portions of the movable platen 12, the rear platen 13 and the suction plate 22, the diameter of the rod 39 can be increased. Therefore, since the lead of the screw 43 can be made small enough, even when the reaction force generated in the movable platen 12 is applied to the rod 39 when the clamp force is transmitted through the rod 39, the rod 39 Does not rotate. As a result, it is not necessary to provide a brake to prevent rotation of the rod 39, so that the structure of the mold thickness adjusting device can be simplified.

After the mold closing is performed by driving the linear motor 28, the electromagnet unit 37 is driven to perform the mold clamping. According to the mold clamping, the movable platen 12 is also slightly advanced. At this time, the mover 31 is slightly advanced in the linear motor 28, but it is not necessary to drive the linear motor 28 in synchronism with the driving of the electromagnet unit 37, supplying a current to the coil 35. It is only necessary to stop the motor and put the linear motor 28 in a non-driven (free) state. Therefore, the control of the drive of the linear motor 28 can be simplified.

In addition, in order to advance the movable platen 12 as the suction plate 22 is advanced at the time of clamping, it is not necessary to provide a lock mechanism such as a mechanism lock, a shutter, and the like. In addition to simplicity, the linear motor 28 can be driven with no load during mold closing and mold opening. Therefore, the movable platen 12 can be moved smoothly during mold closing and mold opening.

In addition, in this embodiment, since the linear motor 28 is provided between the movable platen 12 and the frame Fr, the driving force generated by the linear motor 28 at the time of mold closing is the direct movable plate. Delivered to the tongue 12. Therefore, the positional precision of the movable platen 12 can be made high.

In this embodiment, however, the entirety of the core 46, the yoke 47, and the suction plate 22 are made of an electromagnetic laminated steel sheet, but the core 46 in the rear platen 13 is used. ), Only the adsorption part 51 in the adsorption plate 22 may be comprised by the electromagnetic laminated steel sheet. In addition, in this embodiment, an electromagnet 49 is formed on the rear surface of the rear platen 13 so as to face the electromagnet 49 so that the adsorption portion 51 can move forward and backward on the front surface of the adsorption plate 22. Although it is supposed to be provided, the adsorption part can be opposed to the adsorption part on the rear platen rear face 13, and the electromagnet can be installed in the front of the adsorption plate 22 so that the electromagnet can be moved forward and backward.

In addition, in this embodiment, the space 56 is formed in the rod 39, and the ejector device 55 is provided in the center part of the back surface of the movable platen 12, but as a clamping force transmission member. Instead of using one rod 39, a plurality of rods can be used, and each rod can be installed around the ejector device 55. In addition, when a plurality of cavity spaces are formed in the mold apparatus 19 and a plurality of molds are formed, the ejector apparatus 55 does not need to be provided in the rod 39, but around the rod 39. A plurality of ejector devices can be installed.

In addition, in this embodiment, although the linear motor 28 is provided as a 1st drive part, an electric motor, a hydraulic cylinder, etc. can be provided instead of the linear motor 28. As shown in FIG. However, when the motor is used, the rotational motion of the rotation generated by driving the motor is converted into a straight motion by the ball screw as the motion direction conversion part, and the movable platen 12 is advanced.

Next, a second embodiment of the present invention in which a linear motor is provided between the movable platen 12 and the rear platen 13 will be described. In addition, about the structure same as 1st Example, the description is abbreviate | omitted by attaching | subjecting the same code | symbol, and the effect of the Example is used for the effect of the invention by having the same structure.

3 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus according to the second embodiment of the present invention.

In this case, in order to advance and retract the movable platen 12 as the first movable member, the linear motor 128 as the first drive portion and the drive portion for the mold opening and closing is used as the movable platen 12 and the second fixing member. It is provided between the rear platens 13. The linear motor 128 includes a stator 129 as a first drive element and a mover 131 as a second drive element. The mover 131 is a rear platen 13 and a second movable element. It extends through the adsorption plate 22 as a member, and is formed on the outer circumferential surface of the rod 139 as the clamping force transmission member connecting the movable platen 12 and the adsorption plate 22 to correspond to the moving range of the movable platen 12. do. In addition, the linear motor 128 and the rod 139 have the same axis. In addition, the stator 129 faces the opening of the front end portion of the hole 41 formed to penetrate the rod 139 in the center portion of the rear platen 13 and faces the movable element 131. In addition, it is formed over a predetermined range.

When the length of the movable element 131 is referred to as Lp1, the length of the stator 129 is referred to as Lm1, and the stroke of the movable platen 12 is referred to as Lst, the length Lm1 is a liner motor 128. The length Lp1 is set in correspondence with the maximum thrust force by

Lp1> Lm1 + Lst

Becomes

That is, the stator 129 protrudes the front end forward by a predetermined amount from the front end surface of the rear platen 13 to secure the length Lm 1, and the rear end of the stator 129 in the rear platen 13. In this case, the front end face is installed by being buried rearward by a predetermined amount. The mover 131 slightly projects the front end forward than the front end of the core 34 when the movable platen 12 and the movable mold 16 as the second mold are in the retreat limit position. The rear end is provided so as to project slightly behind the rear end of the core 34 when the movable platen 12 and the movable mold 16 are in the forward limit position.

In addition, the stator 129 protrudes toward the movable element 131, and further includes a core 34 on which the plurality of magnetic pole teeth 33 are formed at a predetermined pitch, and a coil wound around the magnetic pole teeth 33. (35) is provided. However, the magnetic pole teeth 33 are formed parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. The mover 131 has a core (not shown) and a permanent magnet (not shown) formed to extend over the core, and the permanent magnet alternates each magnetic pole of the N pole and the S pole (not shown). Also, it is formed by magnetizing at the same pitch as the magnetic pole teeth 33.

Therefore, when the linear motor 128 is driven by supplying a predetermined current to the coil 35, the mover 131 is retracted, and thus the movable platen 12 is retracted to perform mold closing and mold opening. have.

In addition, the electromagnet unit 37 as a second drive part and as a mold drive part is provided between the rear platen 13 and the suction plate 22 so that mold can be carried out after the mold closing is completed. Then, at the time of mold closing and mold opening, the suction plate 22 is moved forward and backward in linkage with the advance and return of the movable platen 12, and at the time of clamping, the clamping force generated by the electromagnet unit 37 is transferred to the movable platen 12. In order to transmit, the rod 139 is installed to be retractable. Here, the clamping device 10 is provided by the stationary platen 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 128, the electromagnet unit 37, the rod 139, and the like. ) Is configured.

In addition, the hole 41 for penetrating the rod 139 in the center portion of the rear platen 13, the hole 42 for penetrating the rod 139 in the center portion of the suction plate 22 A bearing member Br2, such as a bush, which is formed so as to face the opening of the rear end of the hole 41 and slidably supports the rod 139, is provided. A screw 43 is formed at the rear end of the rod 139, and the screw 43 and the nut 44 rotatably supported with respect to the suction plate 22 are screwed together. Here, the mold thickness adjusting device is constituted by the mold thickness adjusting motor, the gears, the nuts 44, the rods 139, and the like as the mold thickness adjusting drive unit.

In addition, in this embodiment, the movable platen 12 is guided by the tie bar 14 as the connecting member, but not only by the tie bar 14 but also by the guide Gd as the first guide member. It can also be guided.

In this way, since the movable member 131 and the rod 139 are provided to overlap each other in the axial direction, the axial dimension of the mold clamping apparatus 10 can be reduced, and the mold clamping apparatus 10 can be miniaturized.

Next, a third embodiment of the present invention in which a linkage device is provided between the movable platen 12 and the rear platen 13 will be described. In addition, about the structure same as 1st Example, the description is abbreviate | omitted by attaching | subjecting the same code | symbol, and the effect of the Example is used for the effect of the invention by having the same structure.

Fig. 4 is a diagram showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the third embodiment of the present invention.

In this case, in order to advance and retract the movable platen 12 as the first movable member, the linear motor 28 as the first drive unit and the drive unit for the mold opening and closing is provided with the movable platen 12 and the frame Fr. When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the movable element 31 as the second driving element is retracted, and the movable platen 12 is retracted accordingly. Therefore, mold closing and mold opening can be performed.

In addition, after the mold closing is completed, between the rear platen 13 as the second fixing member and the adsorption plate 22 as the second movable member, the second driving portion and the driving portion for the mold body can be molded. The electromagnet unit 37 is installed. Then, at the time of mold closing and mold opening, the suction plate 22 is moved forward and backward in linkage with the advance and return of the movable platen 12, and at the time of clamping, the clamping force generated by the electromagnet unit 37 is transferred to the movable platen 12. In order to transmit, the rod 239 as the first clamping force transmitting member is installed to be retractable.

Further, in order to amplify the clamping force transmitted to the movable platen 12, a toggle mechanism as a second clamping force transmitting member and a clamping force amplifying member between the movable platen 12 and the rear platen 13 ( 65) is installed to be extensible. To this end, the toggle mechanism 65 is made of a linking device and is a toggle lever 66 which is pivotably supported with respect to the rear platen 13 functioning as a toggle support, the toggle lever 66 and the movable plate. The arm 67 which is connected to the tongue 12 and pivotally supported with respect to the toggle lever 66 and the movable platen 12, and a rod 239 functioning as a crosshead with the toggle lever 66. A toggle lever 68 coupled to the front end and swingably supported with respect to the toggle lever 66 and the rod 239. Here, the fixed platen 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the toggle mechanism 65, the rod 239 The mold clamping device 10 is constituted by, for example.

Next, operation | movement of the clamping apparatus 10 of the said structure is demonstrated.

First, the mold opening and closing processing means of the control unit performs mold opening and closing processing, and at the time of mold closing, the current is supplied to the coil 35 to drive the linear motor 28. As a result, the movable platen 12 is advanced, and as shown in the drawing, the movable mold 16 as the second mold comes into contact with the stationary mold 15 as the first mold. At this time, between the rear platen 13 and the adsorption plate 22, that is, between the electromagnet 49 as the first drive member and the adsorption portion 51 as the second drive member, a gap that is optimal for generating adsorption force ( delta 1) is maintained. In addition, as the movable platen 12 moves forward, the toggle mechanism 65 extends and unfolds, but in a state where the movable mold 16 is in contact with the stationary mold 15, the toggle mechanism 65 is completely It is not meant to stretch out.

Subsequently, in the state shown in the drawing, the mold opening and closing processing means supplies an electric current to the coil 48 to drive the electromagnet unit 37 to adsorb the adsorption unit 51 by the adsorption force of the electromagnet 49. do. Accordingly, the clamping force is transmitted to the toggle mechanism 65 through the suction plate 22 and the rod 239, and the clamping force is amplified by the toggle mechanism 65 to be transmitted to the movable platen 12 to perform the clamping. Lose.

Then, the toggle mechanism 65 is further extended and spread, and the gap δ2 between the electromagnet 49 and the adsorption portion 51.

δ2 <δ1

When this is formed, the toggle mechanism 65 is fully extended and unfolded so that a sufficient clamping force is generated and transmitted to the movable platen 12.

Thus, in the present embodiment, since the mold is formed by extending the toggle mechanism 65, the amount of advancement of the suction plate 22 at the time of mold can be made smaller than the amount of advance of the movable platen 12. Therefore, the axial dimension of the mold clamping apparatus 10 can be made small, and the mold clamping apparatus 10 can be miniaturized.

In addition, since the clamping force is amplified by the toggle mechanism 65, the area of the electromagnet 49 can be reduced, and the mold clamping device 10 can be miniaturized.

In addition, since the stator 29 and the toggle mechanism 65 as the first driving element are provided so as to overlap in the axial direction, the axial dimension of the clamping device 10 can be reduced, and the clamping device 10 is further enhanced. It can be miniaturized.

In this case, the gap δ2 is adjusted so that the rear platen 13 and the suction plate 22 do not come into contact while the mold is being formed. And between the rear platen 13 and the adsorption plate 22, for example, the surface which opposes the adsorption plate 22 in the rear platen 13, or the rear platen 13 in the adsorption plate 22. A stopper can be formed on the surface opposite to each other so that the predetermined gap δ2 can be maintained. Further, a stopper can be provided at a predetermined position of the frame Fr between the rear platen 13 and the suction plate 22.

In this embodiment, the drive of the linear motor 28 is stopped and the electromagnet unit 37 is driven before the toggle mechanism 65 is fully extended and unfolded, but when the toggle mechanism 65 is fully extended and unfolded. The drive of the linear motor 28 may be stopped and the electromagnet unit 37 may be driven.

In that case, the mold opening and closing processing means of the control unit performs mold opening and closing processing, and supplies the current to the coil 35 at the time of mold closing to drive the linear motor 28. As a result, the movable platen 12 is advanced, and as shown in the drawing, the movable mold 16 is brought into contact with the stationary mold 15. At this time, the gap δ1 is maintained between the electromagnet 49 and the adsorption part 51. In addition, as the movable platen 12 is advanced, the toggle mechanism 65 is fully extended and unfolded.

Subsequently, the mold opening and closing processing means supplies a current to the coil 48 to drive the electromagnet unit 37 at the time of clamping, so as to adsorb the adsorption unit 51 by the adsorption force of the electromagnet 49. Accordingly, the clamping force is transmitted to the toggle mechanism 65 through the suction plate 22 and the rod 239, and the clamping force is amplified by the toggle mechanism 65 to be transmitted to the movable platen 12 to perform the clamping. Lose.

Then, while the toggle mechanism 65 is fully extended and unfolded, the adsorption plate 22 is advanced, and a gap δ2 is formed between the electromagnet 49 and the adsorption portion 51 to generate a sufficient clamping force. It is delivered to the movable platen (12). Moreover, the mold thickness adjusting apparatus is comprised by the said mold thickness adjusting motor, each gear, the nut 44, the rod 239, etc. as a mold thickness adjusting drive part.

Next, a fourth embodiment of the present invention in which a linear motor is provided between the suction plate 22 and the frame Fr will be described. In addition, about the structure same as 1st Example, the description is abbreviate | omitted by attaching | subjecting the same code | symbol, and the effect of the Example is used for the effect of the invention by having the same structure.

Fig. 5 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the fourth embodiment of the present invention.

In this case, the linear motor 128 as the first drive part and also as the mold opening and closing drive part is movable on the frame Fr in parallel with the guide Gd as the first guide member and also as the first movable member. The stator 129 as a first driving element provided in correspondence with the movement range of the platen 12 and the suction plate 22 as the second movable member, and the lower end of the suction plate 22, facing the stator 129. In addition, a movable element 131 as a second driving element provided over a predetermined range is provided. When the length of the stator 129 is referred to as Lm2, the length of the movable element 131 is referred to as Lp2, and the strokes of the movable platen 12 and the suction plate 22 are referred to as Lst1. The length Lm2 is set in correspondence with the maximum propulsion force by the linear motor 128,

Lm2> Lp2 + Lst1

Becomes

That is, the movable member 131 protrudes the front end forward by a predetermined amount from the front end face of the suction plate 22 in order to secure the length Lp2, and the rear end is turned on the rear end face of the suction plate 22. It is formed by projecting backward by a predetermined amount. The stator 129 slightly forwards the front end than the front end of the core 34 when the movable platen 12, the suction plate 22, and the movable mold 16 are in the forward limit position. It protrudes, and the rear end is formed by projecting slightly behind the rear end of the core 34 when the movable platen 12, the suction plate 22, and the movable mold 16 are in the retreat limit position.

Also, it penetrates through the adsorption plate 22 and the rear platen 13 as the second fixing member, is connected to the adsorption plate 22 at the rear end portion, and is connected to the movable platen 12 at the front end portion, thereby clamping force. The rod 39 as the transmission member is installed.

Accordingly, when the linear motor 128 is driven by supplying a predetermined current to the coil 35 of the linear motor 128 during mold closing and mold opening, the driving force as the first output is generated, and accordingly, the movable element ( 131 advances and retreats, and the propulsion force is output to the suction plate 22 as a mold opening and closing force. The mold opening and closing force is transmitted to the movable platen 12 through the rod 39, and the movable platen 12 is moved forward and backward to perform mold closing and mold opening.

In addition, the electromagnet unit 37 as a second drive part and as a mold drive part is provided between the rear platen 13 and the suction plate 22 so that mold can be carried out after the mold closing is completed. Therefore, when the electromagnet unit 37 is driven by supplying a predetermined current to the coil 48 of the electromagnet 49 at the time of clamping, the driving force as the second output is generated in the adsorption portion 51 as the second drive member. This driving force is output to the suction plate 22 as the clamping force, and the clamping force is transmitted to the movable platen 12. Here, the fixing platen 11 as the first fixing member, the movable platen 12, the rear platen 13, the tie bar 14 as the connecting member, the guide post 21 as the second guide member, and the suction plate ( 22), the clamping device 10 is constituted by the linear motor 128, the electromagnet unit 37, the rod 39 and the like.

In this case, at the time of mold closing, the driving force generated by the linear motor 128 is transmitted to the suction plate 22 and then to the movable platen 12 which is integrally connected to the suction plate 22 through the rod 39. Since it transmits and pushes the center of the movable platen 12, the inclination is not formed in the movable platen 12. Therefore, when performing the mold clamping, the movable mold 16 can be pushed with a uniform mold clamping force.

Next, a fifth embodiment of the present invention in which a slide base is provided between the suction plate 22 and the linear motor 128 will be described. In addition, about the structure same as 4th Example, the description is abbreviate | omitted by attaching | subjecting the same code | symbol, and the effect of the Example is used for the effect of the invention by having the same structure.

6 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus according to the fifth embodiment of the present invention, FIG. 7 is a sectional view taken along line XX of FIG. 6, FIG. ZZ section of the.

In this case, the stationary platen 11 as the first fixing member, the movable platen 12 as the first movable member, and the suction plate 22 as the second movable member are guided through the guide block Gb as the guide member. The rear platen 13 as the second fixing member is fixed to the frame Fr as it is placed on the guide Gd as the guide member. Thus, as the tie bar 14 as the connecting member expands and contracts, the stationary platen 11 slightly moves relative to the guide Gd.

Moreover, the linear motor 128 as a 1st drive part and also as a drive part for opening / closing is provided between the adsorption plate 22 and the frame Fr, and has a driving force at the lower end of the adsorption plate 22 as a movable member support part. The movable element 131 as the second drive element is mounted through the slide base Sb as the transmission portion. The slide base Sb covers the surface of the mover 131 and extends in the longitudinal direction toward the front. Therefore, at the lower end of the rear platen 13, a space 215 is formed through the linear motor 128, the guide Gd, the guide block Gb, the slide base Sb, and the like. As a result, the rear platen 13 is fixed to the frame Fr through leg portions 216 formed on both sides of the space 215.

In this case, at the time of mold closing, the driving force generated by the linear motor 128 is transmitted to the slide base Sb and the suction plate 22, and then integrated with the suction plate 22 through the rod 39 as the clamping force transmission member. It is transmitted to the movable platen 12 which is connected to the outside, and pushes the center of the movable platen 12, so that no inclination is formed on the movable platen 12. Therefore, when performing the mold clamping, the movable mold 16 can be pushed with a uniform mold clamping force.

By the way, the lower end of the adsorption plate 22 and the rear end of the slide base Sb are sufficiently firmly fixed, and the "L" shaped propulsion force functions as a rigid body by the adsorption plate 22 and the slide base Sb. The delivery unit is configured. Therefore, in the mold closing, the propulsion force generated by the linear motor 128 is transmitted to the suction plate 22 through the slide base Sb, and further to the rod 39, so that the inclination of the suction plate 22 is reduced. It can be prevented from forming. As a result, thrust force can be smoothly transmitted to the movable platen 12 through the rod 39.

Next, a sixth embodiment of the present invention in which the slide base Sb is provided between the movable platen 12 and the linear motor 128 will be described. In addition, about the structure similar to Example 5, the description is abbreviate | omitted by attaching | subjecting the same code | symbol, and the effect of the Example is used for the effect of the invention by having the same structure.

10 is a view showing a state of mold closing of a mold apparatus and a mold clamping apparatus according to a sixth embodiment of the present invention, FIG. 11 is an AA sectional view of FIG. 10, FIG. 12 is a BB sectional view of FIG. 10, and FIG. 13 is FIG. 10. CC cross section.

In this case, the stationary platen 11 as the first fixing member, the movable platen 12 as the first movable member, and the suction plate 22 as the second movable member are guided through the guide block Gb as the guide member. The rear platen 13 as the second fixing member is fixed to the frame Fr as it is placed on the guide Gd as the guide member. Thus, as the tie bar 14 as the connecting member expands and contracts, the stationary platen 11 slightly moves relative to the guide Gd.

Moreover, the linear motor 128 as a 1st drive part and also as a drive part for opening / closing is provided between the movable platen 12 and the frame Fr, and acts as a movable member support part at the lower end of the movable platen 12. The movable member 131 as the second driving element is mounted through the slide base Sb. The slide base Sb covers the surface of the mover 131 and extends in the longitudinal direction toward the rear. Therefore, at the lower end of the rear platen 13, a space 215 is formed through the linear motor 128, the guide Gd, the guide block Gb, the slide base Sb, and the like. As a result, the rear platen 13 is fixed to the frame Fr through leg portions 216 formed on both sides of the space 215.

By the way, the lower end of the movable platen 12 and the front end of the slide base Sb are sufficiently firmly fixed, and are made of an "L" shape functioning as a rigid body by the movable platen 12 and the slide base Sb. A propulsion force transmission unit is configured. Therefore, in the mold closing, the driving force generated by the linear motor 128 is transmitted to the movable platen 12 through the slide base Sb, thereby preventing the inclination of the movable platen 12 from being formed. Can be. As a result, when performing a mold clamping, the movable mold 16 can be pushed by a uniform clamping force.

Next, a seventh embodiment of the present invention in which a slide base is provided between the movable platen 12 and the suction plate 22 and the linear motor 128 will be described. In addition, about the structure similar to Example 5, the description is abbreviate | omitted by attaching | subjecting the same code | symbol, and the effect of the Example is used for the effect of the invention by having the same structure.

Fig. 14 is a view showing a state of mold closing of the mold apparatus and the mold clamping apparatus in the seventh embodiment of the present invention.

In this case, the stationary platen 11 as the first fixing member, the movable platen 12 as the first movable member, and the suction plate 22 as the second movable member are guided through the guide block Gb as the guide member. The rear platen 13 as the second fixing member is fixed to the frame Fr as it is placed on the guide Gd as the guide member. Thus, as the tie bar 14 as the connecting member expands and contracts, the stationary platen 11 slightly moves relative to the guide Gd.

Moreover, the linear motor 128 as a 1st drive part and also as a drive part for opening / closing is provided between the movable platen 12 and the suction plate 22, and the frame Fr, and the lower end of the movable platen 12 The movable element 131 as the second driving element is mounted through the slide base Sb1 as the movable member support portion provided between the lower end of the suction plate 22 and the suction plate 22. The slide base Sb1 covers the surface of the movable plate 131 and extends between the movable platen 12 and the suction plate 22 in the longitudinal direction. Therefore, at the lower end of the rear platen 13, a space 215 is formed through which the linear motor 128, the guide Gd, the guide block Gb, the slide base Sb1, and the like are enclosed. As a result, the rear platen 13 is fixed to the frame Fr through leg portions 216 (FIG. 8) formed on both sides of the space 215.

By the way, between the lower end of the movable platen 12 and the front end of the slide base Sb1, and between the lower end of the suction plate 22 and the rear end of the slide base Sb1, the movable platen 12, The suction plate 22 and the slide base Sb1 form a propulsion force transmission unit that functions as a rigid body. Therefore, in the mold closing, the driving force generated by the linear motor 128 is transmitted to the suction plate 22 and the movable platen 12 through the slide base Sb1, so that the suction plate 22 and the movable platen ( It is possible to prevent the inclination formed in 12). As a result, when performing a mold clamping, the movable mold 16 can be pushed by a uniform clamping force.

Further, since the propulsion force transmitted through the rod 39 as the clamping force transmission member pushes the center of the movable platen 12, the movable mold 16 can be pushed with a uniform clamping force at the time of performing the clamping. . In addition, since the driving force generated by the linear motor 128 is transmitted directly to the movable platen 12 at the time of mold closing, the positional accuracy of the movable platen 12 can be increased.

However, between the lower end of the movable platen 12 and the front end of the slide base Sb1, or between the lower end of the adsorption plate 22 and the slide base Sb1, it is fixed so as to be detachable from the mold plate, the mold and the mold opening. In contrast to the meshing when the mold is engaged, the meshing of either mold is released so that the movable platen 12 and the suction plate 22 can be relatively moved when the mold thickness is adjusted.

In the first to fourth embodiments, the stationary platen 11 is fixed to the frame Fr, and the rear platen 13 is placed on the guide Gd to be movable. In the fifth to seventh embodiments, the stationary platen 11 is placed on the guide Gd to be moved and the rear platen 13 is fixed to the frame Fr. Either one of 11 and the rear platen 13 can be fixed to the frame Fr, and the other can be mounted on the guide Gd and moved.

However, this invention is not limited to the said Example, It is possible to make various changes based on the meaning of this invention, and does not exclude them from the scope of the present invention.

The present invention can be applied to a clamping device of an injection molding machine.

Claims (13)

(a) a first fixing member equipped with a fixing mold, (b) a first movable member mounted to face the first fixed member and mounted with a movable mold; (c) a second movable member moved forward and backward as the first movable member moves forward and backward, (d) a clamp force transmitting member for connecting the first and second movable members; (e) having a mold opening / closing driving portion for advancing and retracting the first movable member to perform mold opening and closing, (f) The mold clamping device characterized in that at least part of the mold opening and closing driving portion and the mold clamping force transmitting member overlap each other. The method according to claim 1, The mold opening and closing drive unit and the clamping force transmission member is characterized in that it has the same axis. The method according to claim 1, The mold opening and closing drive unit and the clamping force transmission member is installed asymmetrically characterized in that the installation. The method according to any one of claims 1 to 3, The mold opening and closing drive unit is installed along a guide member independent of the tie bar. The method according to any one of claims 1 to 4, (a) a second fixing member is installed between the first and second movable members, (b) A clamping device, characterized in that a clamping driving portion for generating a clamping force by an electromagnet is provided on the second fixing member and the second movable member. The method according to claim 1, The clamping force transmitting member extends through the second fixing member. The method according to claim 1, The clamping force transmission member is a clamping device, characterized in that the link device provided between the second fixing member and the first movable member. The method according to any one of claims 1 to 4, The mold opening and closing device is characterized in that the mold opening and closing drive unit is a linear motor. The method according to claim 1, A mold clamping device, characterized in that the drive for adjusting the thickness of the mold is installed on the first movable member. The method according to claim 1, Molding apparatus, characterized in that the drive for adjusting the thickness of the mold is installed on the second fixing member. The method according to claim 4, The mold opening and closing drive unit is provided between at least one of the first and second movable members and the frame. The method according to claim 1, A mold clamping device, characterized in that a movable member supporting portion is provided between at least one of the mold opening and closing driving portion and the first and second movable members. A first fixing member equipped with a stationary mold, a first movable member mounted to face the first fixing member, a second movable member with which the movable mold is mounted, and a second movable member which retreats as the first movable member moves forward and backward; And a clamping force transmission member for connecting the second movable member, a mold opening and closing driver for advancing and retracting the first movable member, and a clamping driving portion for advancing the second movable member to perform mold clamping. In the mold clamping method of the mold clamping device, the mold opening / closing drive unit and the clamping force transmitting member overlap at least a part thereof. (a) mold closing and mold opening by driving the mold opening and closing drive unit; (b) A mold clamping method characterized by performing a mold clamping by driving the mold clamping section.

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