JPH10296810A - Composite mold-clamping unit for injection molding machine or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently injection mold by constituting simply in a small size, suitably and simply regulating a mold thickness, and smoothly performing composite mold closing and mold clamping operations. SOLUTION: In the composite mold clamping unit for an injection molding machine comprising a movable platen 18 mounting a movable mold 16 via a tie bar 14 to a fixed platen 10 mounting a fixed mold 12 and telescopically oppositely disposed, a moving means 24 for telescopically moving the platen 18 on the bar 14, and an engaging means for locking the movement of the means 24 at a predetermined position, a mold clamping plate 20 having a mold clamping ram 22 provided via the bar 14 is disposed rear of the platen 18, and as the engaging means, a mold clamping half nut 30 for engaging the bar 14 with the plate 20, and a mold opening half nut 28 for deciding a high pressure mold opening position by a position moving means 26 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite mold clamping apparatus such as an injection molding machine, and more particularly to a composite mold clamping apparatus such as an injection molding machine having a mold clamping cylinder which also serves as a normal high-pressure mold opening and mold thickness adjusting device. It relates to a mold clamping device.

[0002]

2. Description of the Related Art Conventionally, as a composite mold clamping device such as an injection molding machine, a mold clamping device provided with a tie bar having one end fixed to a fixed plate and disposed so as to penetrate a moving plate, has a tie bar. By selectively engaging a formed engaging portion such as a screw or a groove with a half nut attached to the moving plate, a predetermined mold clamping dimension corresponding to the mold thickness is set. .

[0003] In the mold clamping device having such a configuration, in order to properly engage an engaging portion such as a screw or a groove formed on a tie bar with a half nut attached to a moving platen, both of them are required. It is necessary to appropriately adjust the meshing position of.

[0004] From such a viewpoint, conventionally, for example, a fixed plate holding a fixed die, a moving plate holding a moving die, means for moving the moving plate forward and backward with respect to the fixed plate,
After the moving plate approaches the fixed plate and the fixed die and the moving die are closed, the tie bar is fixed to the moving plate, and the tie bar is fixed to the moving plate. A half nut having a long screw portion on the opposite side of the fixed end thereof, and a half nut which can be opened and closed substantially at right angles to the tie bar axis is provided on the opposite die mounting surface side of the fixed plate, and this half nut is attached to the fixed plate. It is urged to press against the tip of the ram that constitutes the insertion hole of the attached tie bar, and at the same time, the end surface of the ram is pressed against the stopper surface of the sprocket that moves forward and backward by rotating, and the half nut meshing position adjustment In Japanese Patent Application Laid-Open No. 2-18009, there has been proposed a mold thickness adjusting device configured to be able to adjust the position of the stopper surface by rotating the sprocket.

[0005] In the mold thickness adjusting device proposed as described above,
Measure the required amount of movement of the half nut to the appropriate meshing position according to the mold thickness, and adjust the position for the amount of movement.
This is done by rotating the sprocket and moving the positioning stopper. The opening and closing operation of the mold clamping half nut is performed at the mold closing limit. The high-pressure mold opening operation is performed by two mold opening / closing cylinders located on a diagonal line.

However, in the conventional mold clamping device, a simple structure is required because the number of parts is too large and causes a failure. Further, since the opening and closing operation of the mold clamping half nut must be performed at the mold closing limit, this time becomes a molding loss time, which is an obstacle to a high cycle. Further, depending on the mold, the cavity may be unbalanced due to the structure of the molded product. However, since the high-pressure mold opening operation is performed by the two mold opening / closing cylinders located diagonally, a shock occurs at the time of mold release. In addition to the problem that it is difficult to perform compression molding.

Therefore, a mold clamping device configured as shown in FIGS. 16 (a) and 16 (b) has been proposed. That is, in FIGS. 16A and 16B, a mold clamping cylinder 60 is formed on the fixed plate 50, a piston is formed at one end of the tie bar 56, and this piston is inserted into the mold clamping cylinder 60, The other end of 56 is formed so as to penetrate and guide the moving plate 53, and an engaging portion 59 such as a screw or a groove formed on the tie bar 56 and a half nut 58 attached to the moving plate 53. By selectively engaging, a predetermined mold clamping dimension corresponding to the mold thickness is set.

In the above construction, when the movable platen 53 is moved forward by the mold opening / closing cylinder 52 fixed to the fixed platen 50 to close the molds 51 and 54, the stopper 55 is connected to the large diameter portion and the small diameter portion of the tie bar 56. The half nut 58 meshes with the threaded portion 59 provided on the tie bar 56, and the two dies 51 and 54 are firmly connected and fixed. The tie bar 56 is pulled rightward in the figure to perform mold clamping.

As described above, in the mold clamping device, the meshing between the half nut 58 and the tie bar 56 is mechanically determined. Therefore, the reliability of the meshing when setting a predetermined mold clamping dimension corresponding to the mold thickness is determined. The advantage that the property becomes high is obtained.

[0010]

However, in the conventional mold clamping device, the engaging portion such as a screw or a groove formed on the tie bar and the mold clamping half nut mounted on the moving plate are properly fitted. In order to engage, it is necessary to adjust the meshing position of both. That is, according to the above configuration, since the engagement position is always constant, when the mold thickness changes, the position of the piston of the mold clamping cylinder must be moved within the mold clamping cylinder by the change. Therefore, in order to be able to cope with various mold thicknesses, it is necessary to design a long mold clamping cylinder. In this case, not only does the weight increase, but also the overall machine length increases and the manufacturing cost increases. There are disadvantages.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and compact structure, to appropriately and easily perform mold thickness adjustment, and to smoothly perform complex mold closing and clamping operations. An object of the present invention is to provide a composite mold clamping device such as an injection molding machine capable of performing efficient injection molding and the like.

[0012]

In order to achieve the above-mentioned object, a composite mold clamping apparatus such as an injection molding machine according to the present invention uses a movable mold through a tie bar to a fixed plate on which a fixed mold is mounted. A composite of an injection molding machine and the like, in which the mounted moving plate is disposed so as to be capable of moving forward and backward, and moving means for moving the moving plate forward and backward on the tie bar and engaging means for locking the movement at a predetermined position are provided. In the mold clamping device, a mold clamping plate provided with a mold clamping ram via a tie bar is arranged behind the moving platen, and as the engagement means, a mold clamping half nut that engages the tie bar with the mold clamping plate. And a mold opening half nut for determining the high pressure mold opening position by the moving means with respect to the tie bar.

[0013] Further, as a composite mold clamping device such as the injection molding machine or the like, as the engaging means, a mold clamping half nut disposed on the outer surface of the moving plate for engaging the tie bar with the moving plate, and its opening / closing means. And a mold opening half nut movably disposed on the tie bar to determine a meshing position between the mold clamping half nut and the tie bar, and an opening / closing means and a moving means therefor.

In this case, the means for moving the mold opening half nut can be configured such that a cylinder is mounted on a fixed platen to move the mold opening half nut to an arbitrary position.

In the moving means of the mold opening half nut, a connecting bracket is mounted on a moving plate, and the bracket and the mold opening half nut are engaged and guided by the opening and closing means of the mold opening half nut. In this case, the mold opening half-nut can be moved to an arbitrary position by moving the moving plate and adjusted.

Further, as a composite mold clamping device such as the injection molding machine or the like, a mold clamping plate provided with a mold clamping ram via a tie bar is disposed behind the movable platen, and a tie bar and a mold are provided as the engaging means. A mold clamping half nut disposed on the mold clamping plate for engaging the clamping plate, a mold opening half nut for determining a meshing position between the mold clamping half nut and the tie bar, and disposed on the mold clamping plate; The half nut for opening the mold and a connecting bracket that operates so as to be connected when the half nut is opened and separated when the half nut is closed may be provided.

As described above, according to the present invention, an engaging portion such as a screw or a groove formed on a tie bar and a mold attached to a moving plate or the like, which are difficult points in a conventional composite mold clamping device of this type. It is easy to adjust the meshing position of the half nut for proper engagement with the clamping half nut, and it is possible to open and close the mold half nut while opening and closing the mold, shortening the molding cycle time. Injection molding machine that can achieve high pressure mold opening with a mold clamping cylinder provided on a tie bar, thereby preventing shocks that occur when the mold is opened and reducing the overall machine length. Etc. can be obtained.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a composite mold clamping apparatus such as an injection molding machine according to the present invention.

In the following first to third embodiments, the mold clamping half nut 30, the moving plate 18, and the high-pressure mold opening half nuts 28 and 36, which will be described later, mesh with the threaded portion (or groove) 14a of the tie bar 14. Since the thickness of the mold clamping plate 20 to be engaged in the reciprocating direction is set to the integral pitch of the screw portion 14a, the reciprocating position of the mold clamping plate 20 and the moving plate 18 coincides with the pitch phase of the screw portion 14a. At this time, the mold clamping half nut 30 and the high pressure mold opening half nuts 28 and 36 can be properly engaged and engaged.

Embodiment 1 FIGS. 1 to 3 show an embodiment of a composite mold clamping apparatus for an injection molding machine according to the present invention. 1 to 3, reference numeral 10 denotes a fixed plate. A fixed die 12 is mounted on the fixed plate 10, and a movable die 16 is mounted on the fixed plate 10 via a tie bar 14. The movable platen 18 is arranged to be able to move forward and backward. further,
A mold clamping plate 20 is arranged behind the moving plate 18 via a tie bar 14, and the moving plate 18 and the mold clamping plate 20 are arranged.
And the mold clamping ram 22 is attached between the two.

That is, one end of the clamping ram 22 is attached to the moving plate 18, while a clamping cylinder 20a is formed inside the clamping plate 20, and the piston 22a of the clamping ram 22 is attached to the clamping cylinder 20a. Is fitted.
The moving plate 18 is moved by a moving cylinder 24 as moving means fixed to the fixed plate 12.
The movable die 16 is connected to the distal end of the movable die 16 via a coupling member 24b to open and close the fixed die 12 of the movable die 16.

On the other hand, the moving platen 18 and the mold clamping plate 20
, A rod 26a which is moved forward and backward by a moving cylinder 26 as moving means fixed to the fixed platen 10.
A high-pressure mold opening half nut 28 is connected to the tip of the tie bar 14, and the high-pressure mold opening operation is performed by contacting the inner surface of the mold clamping plate 20. The screw portion (or groove portion) 14a is configured to be moved by an open / close cylinder or the like (not shown) and engaged with the screw portion (or groove portion). In this case, the moving plate 18 is mounted on the tie bar 14 by the high-pressure mold opening half nut 28.
The half nut 28 is configured so as to be able to pass freely on the tie bar 14 by cutting out a part thereof (not shown) so as not to interfere with the tie bar 14. A mold clamping half nut 30 is provided on the outer surface of the mold clamping plate 20 as an engagement means that meshes with the screw portion 14a of the tie bar 14, and the mold clamping half nut 30 is opened and closed by an opening and closing cylinder 30a. It is configured to In FIG. 1, reference numeral 32 indicates a nozzle portion of the injection molding machine.

In the thus-configured composite mold clamping apparatus according to the present embodiment, when the molds 12 and 16 are attached and the mold thickness is adjusted, first, as shown in FIG. In the state where the closing operation is started, the mold clamping half nut 3
0, the engagement between the tie bar 14 and the mold clamping plate 20 is released.
4 has been released. And mold clamping ram 2
2 is located at the forward end.

Next, a mold closing operation is performed by the moving cylinder 24. In this case, as shown in FIG. 3, at the time of closing the mold of the moving plate 18, the moving cylinder 26 moves the high-pressure mold opening half nut 28 forward and backward, and the high-pressure mold opening half nut is attached to the inner surface of the mold clamping plate 20. 28 are brought into contact. In this contact position, the half nut 28 is closed by operating an opening / closing cylinder (not shown) or the like. At this time, it is convenient if the half nut 28 and the threaded portion 14a of the tie bar 14 can be properly engaged with each other.

Therefore, both dies 1 are moved by the moving cylinder 24.
With the high-pressure mold opening half nut 28 pressed against the threaded portion 14 a of the tie bar 14 in a state where the nuts 2 and 16 are closed, the moving cylinder 26 moves the side surface of the half nut 28 from the inner surface of the mold clamping plate 20. The moving cylinder 26 is stopped at a position where the half nut 28 and the screw portion 14a of the tie bar 14 are properly engaged with each other in the direction of the board 18. As described above, when the high-pressure mold opening half nut 28 is engaged with the screw portion 14a of the tie bar 14, this state is always maintained except when the mold is replaced and the mold thickness is adjusted.

As a method of setting the high-pressure type opening half nut 28 to an appropriate meshing position, there is a method of directly and mechanically meshing as described above, but a position detector or the like is used. After calculating the meshing position from the mold thickness and moving the half nut 28 by the moving cylinder 26 to the calculated position, the opening / closing cylinder (not shown) is operated to set the half nut 28 at the meshing position. You can also.

Next, the engagement position of the mold clamping half nut 30 is adjusted. In this case, since the side surface of the half nut 28 is separated from the inner side surface of the mold clamping plate 20 in the above-described adjustment of the engagement position of the half nut 28 for opening the high-pressure mold, there is a gap S. Therefore, as shown in FIG.
While the mold is closed, the high-pressure mold opening side B of the mold closing cylinder 20a.
The mold clamping plate 20 is moved forward (relatively rightward) to bring its inner surface into contact with the side surface of the high-pressure mold opening half nut 28. At this contact position, the opening / closing cylinder 30a is operated to close the mold clamping half nut 30 and engage it with the screw portion 14a of the tie bar 14.

According to the thus-configured composite mold clamping apparatus of the present embodiment, in the molding operation, the mold clamping ram 22 is at the retracted position, and the movable cylinder 24 is operated to operate the mold clamping as described above. At the position where the side surface of the high-pressure mold opening half nut 28 abuts against the inner surface of the plate 20,
0a is operated and the mold clamping half nut 30 is
The mold can be closed by meshing with the screw portion 14a of FIG. 4 and moving the moving plate 24 forward to the mold closing position by continuously operating the moving cylinder 24 (see FIG. 2).

Next, pressure oil is introduced into the clamping chamber side A of the clamping cylinder 20a, and a high-pressure clamping force is generated by the clamping ram 22. After such setting, the nozzle unit 3 of the injection molding machine is used.
The molded product is manufactured through the injection, filling, pressure-holding, and cooling steps of the molten resin material into the mold via 2 and the process proceeds to the mold opening step.

In this mold opening step, since the high-pressure mold opening half nut 28 is always in a closed state, pressure oil is introduced into the high-pressure mold opening side B of the mold clamping cylinder 20a and the mold clamping ram 22 is retracted. (Leftward) and open the high pressure mold. At the same time, during the high-pressure mold opening operation, the engagement of the mold clamping half nut 30 with the tie bar 14 is released, and the movable cylinder 24 opens the mold.

Thus, one cycle operation of the injection molding can be completed. Therefore, in the composite mold clamping device according to the present embodiment, the mold clamping half nut can be opened and closed while the mold is being opened and closed, and the molding cycle time can be reduced, and the high-pressure mold opening can be performed by the mold clamping ram. By doing so, it is possible to prevent a shock that occurs when the mold is opened.

Embodiment 2 FIGS. 4 to 9 show another embodiment of the composite mold clamping apparatus of the injection molding machine according to the present invention.

That is, in this embodiment, the fixed plate 1
A tie bar 14 is provided at a joint portion of the tie bar 14 with the tie bar 14, and a piston portion 14b formed at the other end of the tie bar 14 is inserted into the mold clamping cylinder 34 so that the tie bar 14 can move forward and backward. A mold-clamping half nut 30 is provided on the outer surface of the tie bar 18 as an engagement means that meshes with the screw portion 14a of the tie bar 14. Further, a high-pressure mold opening half nut 36 for determining a meshing position of the mold clamping half nut 30 is provided at a position on the screw portion 14a of the tie bar 14 on the inner side surface of the movable platen 18. The high-pressure half nut 36 for opening is connected to an upper half nut 36a and a lower half nut 36b movably by a connecting plate described later, and the upper end of the upper half nut 36a is connected to the opening / closing cylinder 38 via a piston rod 36c. Insert through. A connection bracket 40 is provided on a part of the moving plate 18 so as to correspond to the tip of the piston rod 36c of the half nut 36 for opening the high-pressure mold. 14a, the piston rod 36c of the half nut 36 is attached to the engaging portion 40a of the connection bracket 40.
Are configured to engage with each other.

Since the other structure is the same as that of the first embodiment shown in FIGS. 1 to 3, the same components are denoted by the same reference numerals, and detailed description will be omitted.

In the thus-configured composite mold clamping apparatus according to the present embodiment, when the molds 12 and 16 are mounted and the mold thickness is adjusted, first, as shown in FIG. In the state where the closing operation is started, the mold clamping half nut 3
0, the engagement relationship between the tie bar 14 and the moving plate 18 is released, and the high-pressure opening half nut 36 is also released from the connection relationship with the tie bar 14. The tie bar 14 is moved and held at the left end by the mold clamping cylinder 34.

However, the high-pressure mold opening half nut 3
Details of 6 are as shown in FIGS.
That is, in FIGS. 9A to 9C, the tie bar 1
The upper half nut 36a and the lower half nut 36b of the high-pressure mold opening half nut 36 are disposed on the upper half 4. A piston rod 36c protrudes from the upper end of the upper half nut 36a, and is inserted through the opening / closing cylinder 38. A connecting plate 37 is attached to the opening / closing cylinder 38, and the other ends of connecting rods 37a and 37b each having one end connected to the connecting plate 37 are connected to the lower half nut 36.
b, the upper half nut 36a and the lower half nut 36b are interconnected. When the high-pressure mold opening half nut 36 is not engaged with the screw portion 14a of the tie bar 14, as shown in FIG.
The movement of the opening / closing cylinder 38 causes the piston rod 36c to move upward, and its distal end engages with the engaging portion 40a of the connecting bracket 40 provided on a part of the moving plate 18 [FIG.
(B)). Therefore, when the high-pressure mold opening half nut 36 is not engaged with the threaded portion 14a of the tie bar 14, the piston rod 36c is engaged with the connection bracket 40, and the half nut 36 is moved in accordance with the movement of the moving plate 18. The nut 36 can be placed on the tie bar 14 and slid.

As means for engaging with the piston rod 36c of the high-pressure type opening half nut 36, the half nut 3 is attached to the fixed plate 10 instead of the connection bracket 40.
6 and the half nut 36 is connected to the tip of the rod of the positioning cylinder to obtain a configuration similar to that of the first embodiment.

Next, the mold closing operation is performed by the moving cylinder 24. In this case, as shown in FIG. 8, at the predetermined mold closing position, the opening / closing cylinder 30 a is operated to engage the mold clamping half nut 30 with the tie bar 14. At this time, it is convenient if the half nut 30 and the threaded portion 14a of the tie bar 14 can be properly engaged with each other, but actually, there is little displacement due to the screw pitch, so that the engagement is small.

Therefore, both dies 1 are moved by the moving cylinder 24.
In a state where the cylinders 2 and 16 are closed, pressure oil is introduced into the high-pressure mold clamping chamber side A of the mold clamping cylinder 34, and the tie bar 14 relatively moves backward (leftward). During this time, the mold clamping half nut 3
0 and the threaded portion 14a of the tie bar 14 mesh at the meshing position, and the mold clamping cylinder 34 is stopped by the meshing position signal at this time.

In this position, the half nut 36 for opening the high-pressure die, which has been guided and moved by the connecting bracket 40, is in a state where the side surface of the half nut 36 is in contact with the inner surface of the moving plate 18. In this position, the opening / closing cylinder 38 is operated, and the half nut 3 for opening the high pressure mold is opened.
6 is closed, this is engaged with the screw portion 14 a of the tie bar 14, and is engaged with the tie bar 14. At this time, the connection between the half nut 36 and the connection bracket 40 is released. As described above, when the high-pressure mold opening half nut 36 is engaged with the screw portion 14a of the tie bar 14, this state is always maintained except when the mold is replaced and the mold thickness is adjusted (see FIGS. 5 and 5). 7).

According to the composite mold clamping device of this embodiment, as described above, after the meshing position of the high-pressure mold opening half nut 36 is adjusted, the molding operation is started. The moving cylinder 24 is operated from the state shown in FIG. 6, and the opening and closing cylinder 30 a is operated at a position where the side surface of the high-pressure mold opening half nut 36 abuts against the inner surface of the moving plate 18, and the mold clamping half nut 30. With the screw portion 14a of the tie bar 14.
At this time, the tie bar is also pushed forward (rightward) by being pressed by the moving platen 18. Subsequently, the moving cylinder 24 is operated to move the moving plate 18 forward to the mold closing position (see FIGS. 5 and 7).

Next, pressure oil is introduced into the clamping chamber side A of the clamping cylinder 34 to generate a high-pressure clamping force via the tie bar 14. After such setting, the nozzle unit 3 of the injection molding machine is used.
The molded product is manufactured through the injection, filling, pressure-holding, and cooling steps of the molten resin material into the mold via 2 and the process proceeds to the mold opening step.

In this mold opening step, the high-pressure mold opening half nut 36 is always in a closed state, so that pressurized oil is introduced into the high-pressure mold opening side B of the mold clamping cylinder 34, and the tie bar 14 is retracted (left). And high pressure mold opening. At the same time, during the high-pressure mold opening operation, the engagement of the mold clamping half nut 30 with the tie bar 14 is released, and the movable cylinder 24 opens the mold.

Thus, one cycle of the injection molding operation can be completed. Therefore, also in the composite mold clamping device of the present embodiment, the mold clamping half nut 30 can be opened and closed while the mold is opened and closed, and the molding cycle time can be shortened, and the high-pressure mold opening is provided on the tie bar. By enabling the use of the mold clamping cylinder, it is possible to prevent a shock generated when the mold is opened. Further, the overall machine length can be reduced.

Embodiment 3 FIGS. 10 to 15 show still another embodiment of the composite mold clamping apparatus of the injection molding machine according to the present invention.

That is, in the present embodiment, in place of the mold clamping cylinder 34 provided in the fixed platen 10 in the second embodiment, a tie bar 14 is provided behind the movable platen 18 as shown in the first embodiment. A mold clamping plate 20 is disposed between the movable platen 18 and the mold clamping plate 20.
Is attached. In this embodiment,
On a base 42 of the injection molding machine, there is provided a slide 44 which moves forward and backward with respect to the fixed plate 10.
8, the movable platen 18 is moved forward and backward by a movable cylinder 24 to perform a mold opening / closing operation.

A high-pressure mold opening half nut 36 for determining the engagement position of the mold clamping half nut 30 is provided at a position on the screw portion 14a of the tie bar 14 on the inner side surface of the mold clamping plate 20. A connection bracket 40 is provided on a part of the mold clamping plate 20 so as to correspond to the protruding portion 38 a of the opening / closing cylinder 38 of the high-pressure mold opening half nut 36. When not engaged with the screw portion 14a, the projecting portion 38a of the opening / closing cylinder 38 of the half nut 36 is engaged with the engaging portion 40a of the connection bracket 40.

Other structures are the same as those of the first embodiment shown in FIGS. 1 to 3 or the second embodiment shown in FIGS. 4 to 9, and therefore, the same components are denoted by the same reference characters. And detailed description is omitted.

In the composite mold clamping apparatus according to the present embodiment having the above-described structure, when the molds 12 and 16 are attached and the mold thickness is adjusted, the mold opening limit is set in the same manner as in the first and second embodiments. In the state where the mold closing operation is started from the position, the engagement relationship between the tie bar 14 and the mold clamping plate 20 by the mold clamping half nut 30 is released, and the engagement relationship between the high pressure mold opening half nut 36 and the tie bar 14 is also reduced. Has been released. The mold clamping ram 22 is located at the retreat limit.

Next, the mold closing operation is performed by the moving cylinder 24. In this case, as shown in FIG. 10, the open / close cylinder 38 is operated at a predetermined mold closing position to engage the high-pressure mold opening half nut 36 with the tie bar 14. At this time, the half nut 36 and the screw portion 14 of the tie bar 14 are
It is convenient if it can be properly engaged with a, but actually there is little displacement due to a deviation due to the screw pitch.

Therefore, both dies 1 are moved by the moving cylinder 24.
With the plates 2 and 16 closed, pressurized oil is introduced into the high-pressure mold-clamping chamber side A of the mold-clamping cylinder 20a to relatively retreat (leftward) the mold-clamping plate 20. During this time, the high-pressure mold opening half nut 36 and the threaded portion 14a of the tie bar 14 mesh at the meshing position. At this time, the connection between the half nut 36 and the connection bracket 40 is released. As described above, when the high-pressure mold opening half nut 36 engages with the screw portion 14 of the tie bar 14, this state is always maintained except when the mold is replaced and the mold thickness is adjusted (FIGS. 14 and 1).
5).

The details of the high-pressure mold opening half nut 36 in this embodiment are basically the same as those used in the second embodiment shown in FIGS. 9A to 9C. In the second embodiment, the distal end of the piston rod 36c penetrating the opening / closing cylinder 38 is configured to engage with the engaging portion 40a of the connection bracket 40.
6c is provided with a protruding portion 38a at the top of the opening / closing cylinder 38 without penetrating the opening / closing cylinder 38, and
8a is configured to engage with the engaging portion 40a. However, both perform the same operation.

As a method of setting the high-pressure type opening half nut 36 to an appropriate meshing position, there is a method of directly and mechanically meshing as described above, but a position detector or the like is used. Then, the engagement position can be calculated from the mold thickness, the mold clamping plate 20 and the half nut 36 can be moved to the calculated position by the moving cylinder 24, and the half nut 36 can be set at the engagement position.

Next, the engagement position of the mold clamping half nut 30 is adjusted. In this case, by adjusting the meshing position of the high-pressure mold opening half nut 36 described above, between the inner surface of the mold clamping plate 20 and the side surface of the high-pressure mold opening half nut 36,
Due to the meshing position signal and the delay of the actual meshing operation,
There is a gap S. Therefore, the moving cylinder 24 is operated, pressure oil is introduced into the high-pressure mold opening side B of the mold clamping cylinder 20a while the mold is closed, and the mold clamping plate 20 is moved forward (relatively rightward). The inner surface is brought into contact with the side surface of the high-pressure mold opening half nut 36. At this contact position, the opening / closing cylinder 3a is operated to close the mold clamping half nut 30 and engage it with the screw portion 14a of the tie bar 14.

According to the composite mold clamping apparatus of this embodiment thus configured, as described above, after the engagement position of the high-pressure mold opening half nut 36 is adjusted, the molding operation is started.
The movable cylinder 24 is operated from the state shown in FIGS. 11 and 12, and the opening / closing cylinder 30 a is operated at a position where the side surface of the high-pressure mold opening half nut 36 abuts against the inner surface of the mold clamping plate 20. The half nut 30 is engaged with the screw portion 14a of the tie bar 14. Subsequently, the moving cylinder 24 is operated to move the moving platen 18 forward to the mold closing position, thereby closing the mold (see FIG. 13).

Next, pressurized oil is introduced into the clamping chamber side A of the clamping cylinder 20a, and the clamping ram 22 generates a high-pressure clamping force. After such setting, the nozzle unit 3 of the injection molding machine is used.
The molded product is manufactured through the injection, filling, pressure-holding, and cooling steps of the molten resin material into the mold via 2 and the process proceeds to the mold opening step.

In this mold opening step, since the high-pressure mold opening half nut 36 is always in a closed state, the high-pressure mold is opened by directly introducing pressure oil into the high-pressure mold opening side B of the mold clamping cylinder 20a. At the same time, during the high-pressure mold opening operation, the engagement of the mold clamping half nut 30 with the tie bar 14 is released, and the movable cylinder 24 opens the mold.

Thus, one cycle of the injection molding operation can be completed. Therefore, also in the composite mold clamping device of the present embodiment, the mold clamping half nut 30 can be opened and closed while the mold is opened and closed, and the molding cycle time can be shortened, and the high-pressure mold opening is provided on the tie bar. By enabling the use of the mold clamping cylinder, it is possible to prevent a shock generated when the mold is opened. Further, the overall machine length can be reduced.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and many design changes can be made without departing from the spirit of the present invention. That is, it goes without saying that the composite mold clamping device of the present invention can be similarly applied to, for example, a composite mold clamping device of a die casting machine.

[0060]

As described above, the composite mold clamping apparatus such as an injection molding machine according to the present invention comprises a movable plate having a movable die attached via a tie bar to a fixed plate having a fixed die attached thereto. In a composite mold clamping device such as an injection molding machine, which is provided so as to be capable of moving back and forth and moving means for moving the moving plate on and off the tie bar and engaging means for locking the movement at a predetermined position, A mold clamping plate provided with a mold clamping ram via a tie bar is arranged behind the moving platen, and as the engagement means, a mold clamping half nut for engaging the tie bar and the mold clamping plate, and a tie bar. By providing a configuration in which a mold opening half nut for determining the high-pressure mold opening position by the position moving means is provided, the configuration can be made simple and compact, and the mold thickness can be adjusted properly and easily, and the composite Typical Closed and clamping operation to be smoothly achieved efficient injection molding or the like can be performed.

In particular, according to the composite mold clamping apparatus according to the present invention, the mold clamping half nut can be opened and closed while the mold is being opened and closed, so that the molding cycle time can be shortened and the high-pressure mold opening can be performed by using a tie bar. Can be prevented by the use of the mold clamping cylinder provided at the time of opening the mold. In addition, there are many excellent advantages such as a reduction in the overall machine length.

[Brief description of the drawings]

FIG. 1 is a schematic sectional side view showing one embodiment of a composite mold clamping device such as an injection molding machine according to the present invention.

FIG. 2 is a schematic cross-sectional side view showing an operation state at the time of completion of mold thickness adjustment in the composite mold clamping device shown in FIG.

FIG. 3 is a schematic sectional side view showing an operation state at the time of mold thickness adjustment in the composite mold clamping device shown in FIG.

FIG. 4 is a schematic sectional plan view showing another embodiment of a composite mold clamping device such as an injection molding machine according to the present invention.

FIG. 5 is a schematic sectional plan view showing an operation state of the composite mold clamping device shown in FIG. 4 at the time of mold thickness adjustment.

6 is a schematic cross-sectional side view showing a mold open state after adjusting the mold thickness in the composite mold clamping device shown in FIG. 4;

FIG. 7 is a schematic sectional side view showing a mold clamping operation state of the composite mold clamping device shown in FIG. 6;

8 is a schematic cross-sectional side view of the composite mold clamping device shown in FIG. 4 at the time of attaching a mold and adjusting a mold thickness.

9A and 9B are schematic front views of the high-pressure mold opening half nut when the high-pressure mold opening half nut is closed, and FIG. 9B is a schematic front view when the high-pressure mold opening half nut is closed. It is a schematic front view at the time of opening of a half nut, (c) is a schematic side view in the connection state with a connection bracket at the time of opening of a high-pressure type opening half nut.

FIG. 10 is a schematic sectional side view showing another embodiment of the composite mold clamping device such as an injection molding machine according to the present invention, showing an operation state at the time of mold thickness adjustment.

11 is a schematic cross-sectional side view showing a mold open state after adjusting the mold thickness in the composite mold clamping device shown in FIG.

FIG. 12 is a schematic sectional plan view of the composite mold clamping device shown in FIG.

13 is a schematic sectional plan view showing a mold closing operation state of the composite mold clamping device shown in FIG.

14 is a schematic cross-sectional side view of the composite mold clamping device shown in FIG. 10 at the time of attaching the mold and adjusting the mold thickness.

FIG. 15 is a schematic cross-sectional side view of the composite mold clamping device shown in FIG. 10 at the time of completion of mold attachment and mold thickness adjustment.

16A and 16B are schematic diagrams illustrating a schematic configuration of a conventional composite mold clamping device, wherein FIG. 16A is an explanatory diagram illustrating a mold open state, and FIG. 16B is an explanatory diagram illustrating a mold closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed board 12 Fixed mold 14 Tie bar 14a Screw part 14b Piston part 16 Moving mold 18 Moving board 20 Mold clamping plate 20a Mold clamping cylinder 22 Mold clamping ram 22a Piston 24 Moving cylinder 24a Rod 24b Coupling member 26 Moving cylinder 26a Rod 28 High pressure mold opening half nut 30 Mold clamping half nut 30a Opening / closing cylinder 32 Nozzle part of injection molding machine 34 Mold clamping cylinder 36 High pressure mold opening half nut 36a Upper half nut 36b Lower half nut 36c Piston rod 37 Connecting plate 37a, 37b Connecting rod 38 Opening / closing cylinder 38a Projecting part 40 Connecting bracket 40a Engaging part 42 Base of injection molding machine 44 Slide table

Claims (5)

[Claims] A moving means for moving a moving plate on a tie bar with a moving plate mounted thereon with a movable die via a tie bar so as to advance and retreat, and a moving means for moving the moving plate on the tie bar. In a composite mold clamping device such as an injection molding machine provided with an engaging means for locking a predetermined position, a clamping plate provided with a clamping ram via a tie bar is arranged behind the moving platen. And, as the engagement means,
A composite mold clamping system for an injection molding machine, comprising: a mold clamping half nut for engaging a tie bar with a mold clamping plate; and a mold opening half nut for determining a high-pressure mold opening position by a moving means with respect to the tie bar. apparatus. 2. A moving means for moving a moving plate on which a movable die is mounted via a tie bar so as to be able to move forward and backward with respect to a fixed plate on which a fixed die is mounted, and moving the moving plate on and off the tie bar. In a composite mold clamping device such as an injection molding machine provided with an engaging means for locking at a predetermined position, the engaging means is provided on an outer surface of the moving plate for engaging the tie bar with the moving plate. The provided mold clamping half nut and its opening and closing means, and the mold opening half nut movably arranged on the tie bar to determine the meshing position between the mold clamping half nut and the tie bar, and its opening and closing means and moving means And a composite mold clamping device such as an injection molding machine. 3. The injection molding machine according to claim 2, wherein the means for moving the mold opening half nut is configured to move the mold opening half nut to an arbitrary position by mounting a cylinder on a fixed platen. Composite mold clamping device. 4. The moving means of the mold opening half nut is provided with a connecting bracket attached to a moving plate, and the opening and closing means of the mold opening half nut is operated so that the bracket and the mold opening half nut are engaged and guided. 3. The composite mold clamping device according to claim 2, wherein the mold opening half nut is configured to be moved to an arbitrary position by moving the moving plate and adjusted. 5. A moving means for moving a moving plate on which a moving mold is attached via a tie bar so as to be able to move forward and backward with respect to a fixed plate on which a fixed mold is mounted, and moving the moving plate on and off the tie bar. In a composite mold clamping device such as an injection molding machine provided with an engaging means for locking a predetermined position, a clamping plate provided with a clamping ram via a tie bar is arranged behind the moving platen. And, as the engagement means,
A mold clamping half nut disposed on the mold clamping plate to engage the tie bar and the mold clamping plate; a mold opening half nut for determining a meshing position between the mold clamping half nut and the tie bar; and a mold clamping plate. A half-nut for mold opening and a connection bracket which operates so as to be connected when the half-nut is opened and separated when the half-nut is closed. .