JP3481820B2 - Composite mold clamping device such as injection molding machine - Google Patents

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 device such as an injection molding machine, and more particularly, to a tie- breaker during a mold opening / closing operation of a moving platen.
The present invention relates to a compound mold clamping device such as an injection molding machine provided with a synchronizing means capable of properly engaging an engaging portion such as a screw or a groove formed on an outer peripheral portion of a bar with a half nut as an engaging means.

[0002]

2. Description of the Related Art Conventionally, as a compound mold clamping device such as an injection molding machine, a mold clamping device having a tie bar which is attached to a fixed plate at one end thereof and which penetrates the movable plate is provided on the tie bar. It is configured to set a predetermined mold clamping dimension corresponding to the mold thickness by selectively engaging the formed engaging portion such as a screw or groove with the half nut attached to the moving platen. .

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

From this point of view, conventionally, for example, a fixed plate holding a fixed mold, a movable plate holding a movable mold, and means for moving the movable plate forward and backward relative to the fixed plate,
In a mold clamping device including a fixed plate and a tie bar for clamping and fixing the fixed plate after the movable plate approaches the fixed plate and the movable mold is closed, the tie bar is fixed to the movable plate. , A long screw part is provided on the opposite side of the fixed end, and a half nut that can be opened and closed almost at right angles to the tie bar axis is provided on the anti-die mounting surface side of the fixed plate. The tip of the ram that forms the insertion hole of the mounted tie bar is urged to press against it, 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, adjusting the half nut meshing position. Has proposed a mold thickness adjusting device configured to adjust the position of the stopper surface by rotating the sprocket (Japanese Patent Laid-Open No. 2-18009).

In the mold thickness adjusting device thus proposed,
Measure the required amount of movement of the half nut to the proper meshing position according to the mold thickness, and adjust the position for that amount of movement.
This is done by rotating the sprocket and moving the positioning stopper. Further, the opening and closing operation of the mold clamping half nut is performed only at the mold closing limit. The high-pressure mold opening operation is performed by the two mold opening / closing cylinders located on the diagonal line.

However, in the above-mentioned conventional mold clamping device, the number of parts is too large and it may cause a failure. Therefore, it is required to have a simple structure. Further, since the opening and closing operation of the mold clamping half nut has to be performed at the mold closing limit, this time becomes a loss time of molding, which is an obstacle to high cycle. Further, depending on the mold, the cavity may become unbalanced due to the structure of the molded product, but since the high-pressure mold opening operation is performed by the two mold opening / closing cylinders located on the diagonal line, a shock occurs at the time of mold release. In addition to the above problems, it is difficult to deal with compression molding.

Therefore, for example, a mold clamping device configured as shown in FIGS. 9A and 9B has been proposed. That is, in FIGS. 9A and 9B, a mold clamping cylinder 60 is formed on the fixed platen 50, a piston is formed at one end of the tie bar 56, and the piston is fitted and inserted into the mold clamping cylinder 60. The other end of 56 is formed so as to penetrate the movable platen 53 to guide the movable platen 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 movable platen 53 are provided. By selectively engaging with each other, a predetermined mold clamping dimension corresponding to the mold thickness is set.

In the above structure, 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 causes the large diameter portion and the small diameter portion of the tie bar 56 to move. After the contact with the stepped part 57 made of, and detecting the contact, the half nut 58 meshes with the screw part 59 provided on the tie bar 56, and the molds 51 and 54 are firmly coupled and fixed. Pressure oil is applied to 60, and the tie bar 56 is pulled rightward in the drawing to perform mold clamping.

As described above, in the mold clamping device, the meshing of the half nut 58 and the tie bar 56 is mechanically determined, and therefore the reliability of the meshing is set when the predetermined mold clamping dimension corresponding to the mold thickness is set. There is an advantage that the property is high.

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

Therefore, as a result of repeated studies to solve the above-mentioned problems, the applicant of the present invention has established a positioning means in which the position where the mold clamping half nut meshes with the thread portion of the tie bar is variable according to the thickness of the mold. By providing the mold clamping device of the injection molding machine, which is capable of reducing the size and weight of the entire device, a patent application has been filed (JP-A-6-297526).

The mold clamping device according to this patent application has the structure shown in FIGS. 10 (a) and 10 (b). For convenience of explanation, the same components as those of the device shown in FIGS. 9A and 9B will be designated by the same reference numerals. That is, in the mold clamping device shown in FIGS. 10A and 10B, the fixed platen 50 to which the fixed mold 51 is attached and the movable platen 53 which is arranged facing the fixed platen 50 and to which the movable mold 54 is attached are mounted. When,
A mold opening / closing cylinder 52 that moves the moving platen 53 back and forth in a direction in which it moves toward and away from the fixed plate 50, and a moving mold 54 moves in and out of the fixed mold 51, and the movement that is moved by the mold opening and closing cylinder 52. A tie bar 56 penetrating the board 53 and having a threaded portion 59 on a part of its outer circumference, and a piston 5 formed on the fixed board 50 and formed at one end of the tie bar 56.
Mold clamping cylinder 6 for inserting 6a and advancing and retracting the tie bar 56
0, a half nut 58 externally fitted to the tie bar 56 that moves forward and backward by the mold clamping cylinder 60, and a half nut 58 that meshes with a threaded portion 59 of the tie bar 56 that moves integrally with the movable plate 53, and a meshing position of the half nut 58. Position detection means 61, an opening / closing operation mechanism (not shown) for engaging the half nut 58 with the screw portion 59 of the tie bar 56, and the moving plate 53 for moving in the mold clamping direction. Half nut 5 that moves the mold opening / closing cylinder 60 and moves integrally with the movable plate 53.
When it is detected by the position detecting means 61 that 8 has reached a predetermined position, the opening / closing operation mechanism of the half nut 58 is operated to engage with the screw portion 59 of the tie bar 56, and the mold clamping cylinder 60 Mold clamping side oil chamber 6
Control means (not shown) for supplying pressure oil to 0a or 60b to strongly press the movable platen 53 toward the fixed platen side 50 to perform mold clamping, the fixed mold 51 and the movable mold 54.
And a positioning means 62 for holding the piston 56a of the mold clamping cylinder 60 in a fixed position in a state where they are in contact with each other.

As the positioning means 62, a cylinder 63 formed in the piston 56a of the mold clamping cylinder 60, a stopper 64 formed of a piston slidably provided in the cylinder 63, and the stopper 64 A push-pull adjusting screw 65 for advancing and retracting the stopper 64 by fixing the one end and projecting the other end outside the mold clamping cylinder 60 and rotating the push-pull adjusting screw 65.
It is characterized in that a fixing nut 66 is provided which is screwed into and fixed to a predetermined position according to the thickness of the mold.

Therefore, in the composite mold clamping device having the above-mentioned structure, the position where the half nut 58 meshes with the threaded portion 59 of the tie bar 56 can be varied by the positioning means 62 according to the thickness of the mold. Even if the die thickness changes, the tie bar itself does not have to be displaced according to the die thickness, and as a result, the die clamping cylinder 60 having the piston 56a to which the tie bar 56 is integrally connected has a stroke for die thickness adjustment. Is not required, and a short stroke structure that can secure only an oil chamber for mold clamping is provided, which enables downsizing and weight reduction of the composite mold clamping device.

[0015]

However, the conventional compound mold clamping device described above has an advantage that it is possible to reduce the size and weight of the entire device, but the structure is complicated and the mold clamping is performed during mold opening and closing. Since it is not possible to smoothly open and close the application half nut, there is a loss time in the molding cycle, and there is a drawback that complex mold closing and mold clamping operations cannot be efficiently achieved.

Therefore, as a result of earnest studies, the present inventor has formed a piston portion at one end of the tie bar, and inserts the piston portion into a mold clamping cylinder provided on a stationary platen to move the tie bar forward and backward. In addition, a tie bar sliding servomotor for advancing and retracting the tie bar in the axial direction is provided adjacent to the mold clamping cylinder, and a position detecting means for detecting the position of the tie bar and a relative speed for calculating a relative speed between the movable plate and the tie bar. provided operation means, mold closing control servo motor for moving means and tie bars slide movable platen such that the relative velocity becomes zero at a predetermined position upon
And your, by operating meshing type half nut for clamping when the relative velocity is zero, with the proper engagement with the threaded portion of the half nut and tie bar can be easily carried out, mold opening and closing It was found that a compound mold clamping device such as an injection molding machine can be obtained which can smoothly open and close the mold clamping half nut and eliminate loss time in the molding cycle.

Therefore, an object of the present invention is to make the mold clamping half nut open and close smoothly during mold opening and closing by making the structure simple and small, thereby eliminating the loss time in the molding cycle and improving the composite time. An object of the present invention is to provide a composite mold clamping device such as an injection molding machine capable of smoothly performing a general mold closing and mold clamping operation and performing efficient injection molding and the like.

[0018]

Means for Solving the Problems] To achieve the above object moving, the composite mold clamping device of an injection molding machine or the like according to the present invention, the fixed plate fitted with a fixed mold, with attached transfer Dokin type board was retractably oppositely arranged with the tie bar, and a mold half nuts for clamping for locking in had us in a predetermined position location thereof moves moving unit Ru is advance and retreat the movable platen on said data Iba in composite clamping apparatus of an injection molding machine or the like to be provided, a mold clamping cylinder which is provided so as to advance and retreat the tie bars fitted a piston portion formed on one end of the tie bar to the fixed plate, the tie bar in the axial direction a servomotor for tie bar sliding advancing and retracting, the position detection means for detecting a position of the tie bar, and the relative speed calculating means for calculating a relative velocity between the said movable platen tie bar, at a predetermined position upon mold closing Wherein as serial relative speed becomes 0
And control means for controlling the servomotor means for moving the movable platen and the tie bars slide, the relative speed is 0
It is characterized in that the half nuts are engaged with each other in response to the signal

[0019] As this case, the moving means movable platen to the movable platen is advanced and retreated on the tie bars, which consist of servomotors mold opening and closing, screwing feed screw shaft for rotating the nut member attached to said movable platen Can be configured to.

Further, in the composite mold clamping device such as the injection molding machine according to the present invention, the movable plate having the movable mold attached thereto is movably opposed to the fixed plate having the fixed mold attached thereto via the tie bar. , you mold clamping plate provided with a mold clamping ram via said tie bar to the rear of the movable platen arranged, the movement and the moving means for advancing and retracting the clamping plate and the movable platen on the tie bar in position in the composite mold clamping device such as an injection molding machine comprising providing a half nut for clamping for locking you are, a position detecting means for detecting a positional relationship between the mold clamping plate and the movable platen, the movable platen and a tuning actuator for adjusting the positional relationship between the <br/> clamping plate and the tie bar before by the position detecting means
Serial to detect the relative position and the relative velocity of the half nuts may be relative speeds of the tuning actuator in the detection position is a configuration that controls such that 0.

In this case, a mold clamping plate provided with a mold clamping ram via the tie bar is disposed behind the movable plate,
The tie bar and the half-nut between the clamping plate to the movable platen and providing a tuning actuator comprising a tuning cylinder for adjusting the positional relationship between the mold clamping plate, further wherein the clamping plate and the movable platen A position detector can be provided to detect the relative position and relative speed of the.

As described above, according to the present invention, the engagement part such as the screw or the groove formed on the tie bar and the mold attached to the moving plate, which have been a problem in the conventional composite mold clamping device of this type, are used. It is possible to easily adjust the meshing position of the clamping half nut and the clamping half nut for proper engagement, and it is possible to open and close the mold clamping half nut during mold opening and closing, reducing the molding cycle time. It is possible to obtain a composite mold clamping device such as an injection molding machine that can be manufactured.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of a composite mold clamping device such as an injection molding machine according to the present invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 to 3 show one embodiment of a composite mold clamping device for an injection molding machine according to the present invention. However, in FIGS. 1 to 3, reference numeral 10 indicates a fixed platen, a fixed mold 12 is attached to the fixed platen 10, and a movable mold 16 is attached to the fixed platen 10 through a tie bar 14. The movable platen 18 is arranged so as to be able to move back and forth.

In addition, a part of the movable platen 18 includes a fixed platen 1
2 is mounted with a nut member 24 which is screwed with the feed screw shaft 22 coupled through the connecting member 22a from the mold opening / closing servomotor 20 as a moving means of the movable platen fixed to the rotary plate. Thus, the movable platen 18 is moved back and forth with respect to the fixed platen, and the mold opening / closing operation of the movable mold 16 with respect to the fixed mold 12 is performed.

On the other hand, on the outer side surface of the movable platen 18, a screw part (or groove part) 14a formed at the tip end side of the tie bar 14 penetrating the movable platen 18 is moved by an opening / closing cylinder 26 and meshed with this. A mold clamping half nut 28 as an engaging means is attached. Further, a mold clamping cylinder 30 is provided at the joint portion of the fixed platen 10 with the tie bar 14, and a piston portion 14b formed at the other end of the tie bar 14 is fitted into the mold clamping cylinder 30 and the tie bar 14 is attached to the shaft. It is configured to move back and forth in any direction.

On the outer side of the mold clamping cylinder 30, the shaft portion 14 of the tie bar 14 is inserted from the piston portion 14b.
The screw shaft 31 is screwed into c, and the screw shaft 31 and the connecting member 3
A tie bar sliding servomotor 32 configured to slide through the tie bar 14 in the front-rear axis direction by attaching the tie bar 1a via the 1a and rotating the same is attached (see FIG. 3). In FIG. 1, reference numeral 34 indicates a nozzle portion of the injection molding machine.

In the composite mold clamping device of this embodiment having the above-described structure, when the molds 12 and 16 are attached and the mold thickness is adjusted, first, as shown in FIG. With the closing operation started, the mold clamping half nut 2
The engagement relationship between the tie bar 14 and the movable platen 18 by 8 is released.

Next, the mold closing operation is performed by the mold opening / closing servomotor 20. In this case, the opening / closing cylinder 26 is operated to close the half nut 28 at the mold closing limit. At this time,
It would be convenient if the half nut 28 and the screw portion 14a of the tie bar 14 can be properly meshed with each other.
In reality, the screw pitches on both sides are misaligned, so they rarely engage with each other.

Then, the tie bar sliding servo motor 32 moves the tie bar 14 slightly to the left to stop the driving of the servo motor 32 at the position where the half nut 28 meshes with the screw portion 14a of the tie bar 14, The half nut 28 is engaged with the thread portion 14a of the tie bar 14 (see FIG. 2). The position of the tie bar 14 at this time is read and stored by the position detecting means (not shown). Therefore, in the subsequent molding operation, the moving board 18
Is controlled by the servo motor 32 so that the tie bar 14 is always in this position in the forward movement limit of the mold. In this way, the work of adjusting the mold thickness is completed.

According to the combined mold clamping apparatus of this embodiment, as described above, after adjusting the meshing position of the mold clamping half nut 28, the mold opening / closing servomotor 20 is driven from the state shown in FIG. Then, the movable platen 18 is moved forward, and after reaching an arbitrary position near the forward limit (position B in FIG. 4), the tie bar sliding servomotor 32 is driven to start the rightward movement of the tie bar 14. , And controls the speeds of the servomotors 20 and 32, respectively, to synchronize their relative speeds (that is, to make the relative speeds zero). Then, when the rightward traveling speed of the movable platen 18 and the tie bar 14 are synchronized (position A in FIG. 4), and when the relative speed at a specific position is 0, the half nut 28 is closed and the screw portion 14a of the tie bar 14 is connected. Engage (see Figure 4).

According to the composite mold clamping apparatus of this embodiment, as described above, after the meshing position of the mold clamping half nut 28 is adjusted, the molding operation including the mold closing operation as shown in FIG. 4 is performed. enter.

First, the mold opening / closing servomotor 20 is driven from the state shown in FIG. 1 to move the moving platen 18 forward (to the right), and the moving platen 18 is moved to an arbitrary position near the mold closing limit (FIG. 4). Position B), the tie bar 14 leftward from the previously stored position is driven rightward by driving the tie bar sliding servo motor 32, and the speeds of the servo motors 20 and 32 are controlled respectively. Then, the relative speed between the movable platen 18 and the tie bar 14 is calculated and synchronized (that is, the relative speed between the movable platen 18 and the tie bar 14 is set to 0). Then, at a predetermined position (position A in FIG. 4), when the rightward traveling speed of the movable platen 18 and the tie bar 14 are synchronized, the half nut 28 and the screw portion 1 of the tie bar 14 are synchronized.
The engagement with 4a is detected.

At the proper meshing position, the half nut 28 is closed while maintaining the speed control so that the relative speed becomes 0, and the screw portion 14 of the tie bar 14 is closed.
Engage with a. When the meshing is completed and the movable platen 18 reaches the mold closing limit, the position of the tie bar 14 is read by a position detector (not shown) and compared with the position of the tie bar 14 stored at the time of adjusting the mold thickness. If the comparison results are in agreement, mold clamping and boosting operation are started.

If the meshing position is not appropriate, the speed of either of the servomotors 20 and 32 is controlled. In FIG. 4, the tie bar slide servo motor 32 is indicated by a dotted line with respect to the synchronous speed.
Acceleration / deceleration control. When the proper meshing position is reached (position C in FIG. 4), the synchronous speed is returned to the synchronous speed again, and the half nut 28 is closed while maintaining the speed control so that the relative speed becomes 0, and the tie bar is closed. Screw part 1 of 14
Mesh with 4a.

Further, as shown in FIG. 5 , the screw portion 14 a of the tie bar 14 is assumed not to depend on the meshing position .
The half-nut 28 can be smoothly closed by widening the spiral groove or the square groove of the half nut 28 that engages with the corresponding thread of the threaded portion 14a of the tie bar 14. it can.

Next, the mold clamping chamber side 30a of the mold clamping cylinder 30.
High pressure mold clamping force is generated through the tie bar 14 by introducing pressure oil into the. After setting in this way, the molten resin material is injected and filled into the mold through the nozzle portion 34 of the injection molding machine,
After the holding pressure and cooling process, the molded product is manufactured, and the process proceeds to the mold opening process.

In this mold opening process, the mold clamping cylinder 30
Since pressure oil is introduced to the return side 30b (high-pressure mold opening chamber side) of the moving plate 18 and the moving plate 18 is screwed with the feed screw shaft 22 via the nut member 24, the mold opening / closing servomotor 20 is driven in reverse. The mold can be opened by doing so. At the same time, during this mold opening operation, the meshing of the mold clamping half nut 28 with the tie bar 14 is released. At the same time, the tie bar sliding servomotor 32 is driven in reverse to move the tie bar 14 to the left in FIG.

In this way, one cycle operation of injection molding can be completed. Therefore, in the composite mold clamping apparatus of the present embodiment, the mold clamping half nut 28 can be opened and closed during mold opening and closing, and the molding cycle time can be shortened.

Embodiment 2 FIG. 6 shows another embodiment of the composite mold clamping device of the injection molding machine according to the present invention. For convenience of explanation, FIGS.
The same components as those of the first embodiment shown in FIG. 3 will be described with the same reference numerals.

That is, in this embodiment, the fixed platen 1
In place of the mold clamping cylinder 30 provided at 0, the mold clamping plate 19 is arranged behind the movable plate 18 via the tie bar 14,
The mold clamping ram 3 is provided between the movable platen 18 and the mold clamping plate 19.
6 is attached. In addition, in this embodiment, a slide plate 39 that moves back and forth with respect to the fixed plate 10 is provided on the base 38 of the injection molding machine, and the movable plate 18 is fixed to this slide plate 39, 18 moving cylinder 40
It is configured to be moved forward and backward to perform a mold opening / closing operation. The moving means of the moving platen 18 may be configured by a servo motor mechanism including a feed screw shaft and a nut member instead of the moving cylinder 40.

One end of the mold clamping ram 36 is attached to the movable platen 18, and a mold clamping cylinder 19a is formed inside the mold clamping plate 19, and the piston 36a of the mold clamping ram 36 is formed in the mold clamping cylinder 19a. It is fitted. Also,
A mold clamping half nut 28 is provided on the outer surface of the mold clamping plate 19 as an engaging means that meshes with the threaded portion 14a of the tie bar 14, and the mold clamping half nut 28 is opened and closed by the open / close cylinder 26. Is composed of.

Therefore, in the compound mold clamping apparatus of the present embodiment, a part of the mold clamping plate 19 is a tuning cylinder 42 as a tuning actuator for adjusting the positional relationship between the movable platen 18 and the mold clamping plate 19. Is provided.
The positional relationship between the movable platen 18 and the mold clamping plate 19 can be adjusted by the operation of the tuning cylinder 42. As the tuning actuator, the tuning cylinder 4 is used.
Instead of 2, a servo motor mechanism having a feed screw shaft and a nut member may be used.

Further, a position detector 44 for detecting the positional relationship between the movable platen 18 and the mold clamping plate 19 is provided. The position detector 44 can detect the relative position and relative speed between the half nut 28 and the tie bar 14. That is, the position of the movable platen 18 is detected by a separately provided conventional pulse scale (optical scale and position detector, position setting control device),
A method of calculating and setting the adjustment amount of the meshing position and the like from the mold thickness can be adopted.

In the composite mold clamping device of this embodiment having the above-described structure, when the molds 12 and 16 are attached and the mold thickness is adjusted, the mold closing operation is started from the mold open position. The engagement relationship between the tie bar 14 and the mold clamping plate 19 by the mold clamping half nut 28 is released. Then, by the tuning cylinder 42, the mold clamping plate 1
The mold clamping plate 19 is advanced through the mold clamping ram 36 so that the distance C between the movable platen 9 and the movable platen 18 is minimized.

Then, the moving cylinder 40 performs a mold closing operation. In this case, the opening / closing cylinder 26 is operated to close the half nut 28 at the mold closing limit. At this time, it is convenient if the half nut 28 and the screw portion 14a of the tie bar 14 can be properly meshed with each other, but in reality, the screw pitches of both are misaligned, and therefore the mesh nuts rarely mesh with each other.

Therefore, the moving cylinder 40 is used to move both molds 1
With the half nuts 28 closed, the half cylinder 28 is pressed against the threaded portion 14a of the tie bar 14, and the tuning cylinder 42 is operated, that is, the mold clamping plate 19 is moved in the direction in which the minimum distance C is increased. In the meantime, since the half nut 28 meshes with the screw portion 14a of the tie bar 14,
At that position, the operation of the tuning cylinder 42 is stopped. Then, the opening amount C of the tuning cylinder 42 and the position L of the movable platen 18
The total value of is stored as the meshing position, and the mold thickness adjustment work is completed.

As described above, the half-nut 28 and the screw portion 14a of the tie bar 14 are not in direct contact with each other to determine the meshing position. A method of determining the meshing position can also be adopted (Japanese Patent Application No. 8-9861 of the applicant's prior application).

According to the combined mold clamping apparatus of this embodiment, as described above, after the meshing position of the mold clamping half nut 28 is adjusted, the molding operation including the mold closing operation as shown in FIG. 7 is performed. enter.

First, from the state shown in FIG. 5, the mold closing operation is performed by the moving cylinder 40 to move the moving platen 18 forward (to the right).
When the movable cylinder 18 is moved and reaches an arbitrary position (position B in FIG. 7) before the mold closing limit of the movable platen 18, the tuning cylinder 42 closed from the previously stored position is driven. The speeds of the moving cylinder 40 and the tuning cylinder 42 are controlled respectively,
The relative speed between the half nut 28 and the fixed tie bar 14 is calculated so that the relative speed becomes zero (FIG. 7).
Position A).

In this position, the tuning cylinder 42
If the total value of the opening amount C ′ of the above and the position L ′ of the movable platen 18 is the memorized position described above, the half nut 28 is closed and the screw portion 14a of the tie bar 14 is engaged.

During this time, the movable platen 18 moves to the right, but the opening amount of the tuning cylinder 42 is further expanded and moved leftward relative to the movable platen 18. Relative speed with the half nut 28 is 0
Can be.

When the meshing is completed and the movable platen 18 reaches the mold closing limit, if the total value of the opening amount C'of the tuning cylinder 42 and the position L'of the movable platen 18 is the previously stored position. The closing operation of the mold clamping ram 36 is performed.

Further, at the position A in FIG. 7, even if the total value of the opening amount C'of the tuning cylinder 42 and the position L'of the movable platen 18 does not coincide with the previously stored position, it is shown in FIG. As described above, by widening the spiral groove or the square groove of the half nut 28 that meshes with the threaded portion 14a of the tie bar 14, a wider gap is provided with respect to the ridge corresponding to the threaded portion 14a of the tie bar 14, and the knives 14 smoothly. The half nut 28 can be closed.

In this case, if the stroke of the mold clamping cylinder 19a is set to be relatively long, an arbitrary position for operating the synchronizing cylinder 42 becomes a condition that enables the meshing at a position considerably before the forward limit, for example, It is advantageous for molding a three-sheet mold.

Next, as described above, the mold clamping cylinder 19
Pressure oil is introduced to the mold clamping chamber side of a, and a high pressure mold clamping force is generated by the mold clamping ram 36. After setting in this way, a molten resin material is injected into the mold through the nozzle portion 34 of the injection molding machine, filled, pressure-holding, and cooled, and then a molded product is manufactured, and a mold opening process is performed. .

In this mold opening process, the moving cylinder 40
Is operated to open the mold, but at the same time, the tuning cylinder 42
Is operated to move the distance C in a direction to reduce the distance C, and the relative speed of the half nut 28 moving to the right with respect to the fixed tie bar 14 and the moving platen 18 moving to the left is set to be zero. Then, during this mold opening operation, the meshing of the mold clamping half nut 28 with the tie bar 14 is released.

In this way, one cycle operation of injection molding can be completed. Therefore, in the composite mold clamping apparatus of the present embodiment, the mold clamping half nut 28 can be opened and closed during mold opening and closing, and the molding cycle time can be shortened.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, 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, according to the present invention, a composite mold clamping device of an injection molding machine or the like according to the present invention, the fixed plate fitted with a fixed mold, through the tie bar to the movable platen fitted with a transfer Dokin type <br/> retractably disposed opposite Te, mold clamping for locking Te Contact have <br/> a predetermined position location thereof moves moving unit Ru is advance and retreat the movable platen on said data Iba in composite clamping apparatus of an injection molding machine or the like to be provided with a half nut, the mold clamping cylinder provided so as to advance and retreat the tie bars fitted a piston portion formed on one end of the <br/> tie bar to said fixed plate When the servomotor tie bar slide for advancing and retracting said data <br/> Iba axially, a position detecting means for detecting a position of the tie bar, relative velocity calculation which calculates a relative speed between the said movable platen tie bar Means and front at a predetermined position when closing the mold
And control means for serial relative speed controlling said moving means movable platen and the servo motor for the tie bar slide such that 0, configured to operate the meshing of the half nut by a signal the relative speed becomes 0 By doing so, the structure can be made simple and small, the mold thickness can be adjusted properly and easily, and the complex mold closing and mold clamping operations can be smoothly achieved to perform efficient injection molding and the like. it can.

In particular, according to the composite mold clamping apparatus of the present invention, the mold clamping half nut can be opened and closed during mold opening and closing, and the advantage of shortening the molding cycle time can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional side view showing an 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.

3 is an enlarged cross-sectional view of an essential part showing the configuration of the essential parts of a mold clamping cylinder in the composite mold clamping device shown in FIG.

FIG. 4 is an explanatory view showing an operation state when the mold is closed in the composite mold clamping device shown in FIG. 1.

FIG. 5 is an enlarged cross-sectional view of an essential part showing an embodiment in which the mold clamping half nut and the thread portion of the tie bar are engaged with each other.

FIG. 6 is a schematic cross-sectional side view showing another embodiment of the composite mold clamping device such as the injection molding machine according to the present invention.

FIG. 7 is a waveform diagram showing an operation state of the composite mold clamping device shown in FIG. 6 when the mold is closed.

FIG. 8 is an enlarged cross-sectional view of essential parts showing another embodiment in which the mold clamping half nut and the thread portion of the tie bar mesh with each other.

9A and 9B are schematic diagrams showing the structure of a composite mold clamping device in a conventional injection molding machine, in which FIG. 9A is an explanatory view showing a mold open state, and FIG. 9B is an explanatory view showing a mold closed state. is there.

10A and 10B show another structural example of a composite mold clamping device in a conventional injection molding machine, wherein FIG. 10A is a schematic structural diagram showing a mold open state, and FIG. 10B shows a mold closed state. It is a schematic diagram.

[Explanation of symbols]

10 Fixed plate 12 Fixed mold 14 Thai bar 14a screw part 14b Piston part 14c Shaft 16 Moving mold 18 Moving board 19 Mold clamping plate 19a Mold clamping cylinder 20 type servo motor for opening and closing 22 Feed screw shaft 22a connecting member 24 Nut member 26 Open / close cylinder 28 Half nut for mold clamping 30 mold clamping cylinder 31 screw shaft 31a connecting member 32 Servo motor for tie bar slide 34 Nozzle part of injection molding machine 36 Mold clamping ram 36a piston 38 Injection molding machine base 39 Sliding board 40 moving cylinders 42 Tuning cylinder (tuning actuator) 44 Position detector

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Claims (2)

(57) [Claims] To 1. A stationary platen fitted with a fixed mold, a movable platen fitted with a transfer Dokin type and retractably disposed opposite via a tie bar, advance and retreat the movable platen on said data Iba <br /> allowed that move means and the composite mold clamping device of an injection molding machine or the like that moves with have your a predetermined position location comprising providing a half nut for clamping for locking, of the tie bar to the fixed plate a mold clamping cylinder which is provided so as to be fitted to a piston portion formed on one end is moved forward and backward the tie bar, and a servo motor for tie bar slide for advancing and retracting the tie bar in the axial direction, before
Position detecting means for detecting the position of the serial tie bar, wherein as the relative velocity calculating means for calculating a relative velocity between the said movable platen tie bar, said relative speed at a predetermined position upon mold closing becomes 0 moves and control means for controlling the panel moving means and said tie bar <br/> over slide servo motor of, characterized in that configured such that the relative velocity is operated meshing said half nuts by becomes zero signal injection Compound mold clamping device such as molding machine. 2. A moving board is moved back and forth on a tie bar.
The moving means of the moving board consists of a mold opening / closing servomotor,
The composite mold clamping device for an injection molding machine or the like according to claim 1, wherein a feed screw shaft that is rotationally driven is configured to be screwed into a nut member attached to the movable plate.