JPH0717451Y2 - Mold clamping device - Google Patents

Description

The present invention relates to a mold clamping device such as an injection molding machine, and more particularly to a vertical mold clamping device having a simple structure and excellent operability.

[Prior Art] Conventionally, among the mold clamping devices of this type, a particularly simple structure and structural advantage is shown in FIG.
The press device according to Japanese Patent No. 57 can be mentioned. This pressing device includes a fixed platen 12 forming a cylinder portion 10B of a press cylinder 10, and a movable platen 18 vertically movably held on a tie rod 14 and a guide rod 16 standing on the fixed platen 12. The material to be pressed is configured to be sandwiched between a hot plate 22 arranged between the press plate 20 formed on the piston portion 10A of the press cylinder 10 and the moving plate 18. When pressing the above materials, the moving platen 18 is a boost cylinder as the first step.
The movable platen 18 is moved from the open position shown by the two-dot chain line to the closed position shown by the solid line via 24, and the stopper 26 is engaged with the engaging recess 30 via the braking cylinder 28. Is fixed to the tie rod 14. Next, as a second step, the press platen 20 is pushed upward through the press cylinder 10, whereby the press work is performed. As described above, according to this press device, the stroke of the press cylinder 10 that requires a large pressure is limited to the stroke of the second stage, and thus, the conventional one that requires the total stroke of the first and second stages. In comparison, since the stroke is greatly reduced, the structure of the entire device is greatly reduced in weight and simplified.

However, in the above-mentioned device, since the boost cylinder 24 having a long stroke is mounted on the connecting plate 32 arranged at the uppermost part, the height of the entire device becomes large and a large building is required. However, it had a drawback that the stability of the device was poor and the operability was poor. Further, since the above-mentioned device is a press device, the moving board 18 in the first stage is
The lowered position, that is, the set interval H between the movable platen 18 and the fixed platen 12 is set to be constant. Therefore, when this device is applied to the vertical mold clamping device of the injection molding machine, the mold thickness of the molding mold differs depending on the molded product, so that the stroke of the press cylinder 10 is substantially lengthened. Had the disadvantage that the structural advantage of was lost.

Therefore, as a vertical mold clamping device for an injection molding machine which eliminates the above-mentioned drawbacks, for example, Japanese Patent Publication No. 61-545 shown in FIG.
A mold clamping device for an injection molding machine according to Japanese Patent No. 74 has been proposed. This mold clamping device elevates and lowers the movable platen 18, that is, lower molds attached to the fixed platen 12 and the movable platen 18, respectively.
The boost cylinder 24 that opens and closes the upper mold 36 and the upper mold 38 is fixed to the stationary platen 12, and the lock member 40 that fixes the movable platen 18 to the closed position (the solid line position in the figure) is the movable platen 18.
Is composed of half nut means capable of fixing the tie rod 14 at any position. This half nut means is known, so that the half nut 40B that is opened and closed by the opening and closing cylinder 40A is releasably engaged with any position of the engaging portion 14A formed of a screw or the like formed on the outer periphery of the tie rod 14. Composed. The mold clamping cylinder 42 corresponding to the press cylinder 10 of the previous pressing device is arranged between the movable platen 18 and the lock member 40, and the piston 42A moves upward to press the lock member 40 to move the movable platen 18 Is pressed downward, and thereby the molds 36 and 38 are clamped.

As described above, according to this mold clamping device, the long boost cylinder 24 does not project from the connecting plate 32.
The overall height of the device is reduced. Further, since the lock member 40 can be fixed to the tie rod 14 at any position, it can be adapted to any mold thickness. Therefore, the stroke length of the mold clamping cylinder 42 can be set to the minimum.

[Problems to be solved by the device]

However, even the mold clamping device described above still has the following drawbacks.

That is, since the mold clamping cylinder 42 is placed on the movable platen 18, firstly, the weight of the vertically movable portion becomes heavy, so that the driving power is increased and the roll or the like occurs. For this reason,
In addition to poor operability and stability, it is especially difficult to shorten the operation cycle. Next, since the mold clamping cylinder has a high pressure, oil leakage from the piston sliding part often occurs and the packing of the sliding part requires maintenance at any time. Since the leaked oil drips through the tie rod, especially on the surface of the mold, the molding quality is deteriorated, and since the mold clamping cylinder is located at a high place, the maintenance work of the packing becomes complicated.

Therefore, the object of the present invention is to set the height of the entire device as low as possible, prevent obstacles due to oil leaks, etc., reduce the weight of moving parts and improve the stability of the device, and An object of the present invention is to provide a mold clamping device having excellent operability, which enables easy mold replacement and mold clamping cylinder maintenance work.

[Means for Solving the Problems]

In order to achieve the above object, a mold clamping device according to the present invention is formed on a mold clamping cylinder (52) fixed on a base (50) and on a vertical movement piston part (52A) side of the mold clamping cylinder. A lower mounting plate (56) for mounting one mold half (54),
It is movably held in the vertical direction on a tie rod (60) provided upright on a substrate (58) formed on the fixed cylinder portion (52B) side of the mold clamping cylinder, and the other half mold (6
2) to install the upper mounting plate (64) and the lower mounting plate (5)
A boost cylinder (66) that is fixed to 6) and moves the upper mounting plate (64) up and down, and a boost cylinder (66) that is provided on the side opposite to the mold mounting side of the upper mounting plate (64) and that is located on the outer peripheral surface of the tie rod (60). A lock member (68) having a half nut (68A) releasably engaged with the formed engagement portion (60A), and an engagement phase difference between the tie rod engagement portion (60A) and the half nut (68A). In the mold clamping device, the tie rod engaging portion (60A) and the half nut (68A) axial direction of the tie rod (60) based on the phase difference detected by the detecting means (72). An arithmetic unit (74) for calculating the adjustment distance of
After moving the lower mounting plate (56) in the mold clamping cylinder (52) to relatively move the lock member (68), the lower mounting plate (56) and the base plate (58) of the fixed cylinder part (52B) are moved. Mold thickness adjusting screw part (76B) driven by a gear mechanism between
And a moving device (76) for moving based on the calculation result of the calculating device (74).

[Action]

In the mold clamping device of the present invention, the tie rod engaging portion (60
A) and the half nut (68A) engagement phase difference detection means (7
2), and based on the phase difference detected by this detection means (72), adjust the tie rod engagement part (60A) and half nut (68A) adjustment distance in the tie rod (60) axial direction by the computing device (74). The lower mounting plate (56) is moved by the mold clamping cylinder (52) to relatively move the lock member (68) based on the calculation result of the arithmetic unit (74). Mounting plate (56) and fixed cylinder (52B)
The mold thickness adjusting screw part (76B) driven by the gear mechanism is moved between the base plate (58) and the base plate (58). In this way, the tie rod engaging portion (60A) and the half nut (68A)
The engagement phase of can be easily adapted.

〔Example〕

An embodiment of the mold clamping device according to the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the mold clamping device of the present invention includes a mold clamping cylinder 52 fixedly mounted on a base 50, and a mold 54 formed on the vertical moving piston portion 52A side of the mold clamping cylinder 52. A lower mounting plate 56 for mounting and a tie rod 60 erected on a substrate 58 formed on the fixed cylinder portion 52B side of the mold clamping cylinder 52.
And the upper mounting plate 64 that is held by the tie rods and mounts the other die 62, and the upper mounting plate 64 that is fixed to the lower mounting plate 56.
The boost cylinder 66 for vertically moving the tie rod 60 and the screw engaging portion 60A formed by a screw formed on the outer surface of the tie rod 60 provided on the side opposite to the die of the upper mounting plate 64, that is, on the upper surface of the upper mounting plate 64. The lock member 68 has a half nut 68A that is engagably engaged, and an engagement phase adjusting means 70 that adjusts the engagement phase of the screw engaging portion 60A and the half nut 68A.

The lock member 68 is made of a known technique similar to that shown in FIG. 3, and the half nut 68A is opened / closed by the open / close cylinder 68B to be engaged / disengaged with the screw engaging portion 60A. The engagement phase matching means 70 is a detection member 72 including a porcelain sensor for detecting the engagement phase difference between the screw engagement portion 60A and the half nut 68A.
A calculation device 74 for calculating the axial adjustment distance between the screw engagement portion 60A and the half nut 68A based on the detected phase difference,
And a moving device 76 capable of engaging the half nut 68A with the screw engaging portion 60A by operating the mold clamping cylinder 52 and the moving device 76 based on the calculated adjustment distance to move the lower mounting plate 56. It consists of The moving device 76
Is, for example, a moving screw portion (mold thickness adjusting screw portion) 76B screwed to the internal female screw portion of the gear cylinder 76A rotatably mounted in the lower mounting plate 56, the gear cylinder 76A, the pinion 76C, the servo. It can be configured to be rotationally driven via a motor 76D.

Next, the operation of the mold clamping device of the present invention having such a configuration will be described. First, when mounting or replacing the mold, the lower mounting plate 56 is set at the lowest position where its stopper 56A abuts on the substrate 58, and the upper mounting plate 64 is extended to the highest position by extending the boost cylinder 66. Install, then place the molds 54, 62 on the lower mounting plate 56 in this state,
Next, the upper mounting plate 64 is lowered by lowering the boost cylinder 66 and brought into contact with the upper surface of the mold 62. Detection member in this state
The engagement phase difference between the screw engagement portion 60A and the half nut 68A is detected by 72. Then, the arithmetic unit 74 calculates the adjustment movement amount based on the detected phase difference. Next, low pressure oil is supplied to the mold clamping cylinder 52 to raise the lower mounting plate 56 by several tens of millimeters. In this state, the servo motor 76D is rotated to adjust and set the die thickness adjusting screw portion 76B to a predetermined position. Therefore, the pressure oil of the mold clamping cylinder 52 is released to lower the lower mounting plate 56 to a position where the mold thickness adjusting screw portion 76B abuts on the substrate 58. This completes the engagement phase adjustment work. Next, when the mold is clamped, the lock member 68 first operates in the above state. That is, the half nut 68A is closed on the screw engagement portion 60A by the opening / closing cylinder 68B, but in this case, since the engagement phases of both are matched, reliable lock is stably achieved. Next, high pressure oil is supplied to the mold clamping cylinder 52, and the upper and lower mounting plates 64, 56
High pressure is applied through the tie rod 60 between the two molds 5
4,62 are clamped. The mold clamping device repeats mold opening, mold closing, and mold clamping for taking out the molded product and the next molding cycle.
Since the mold closing position of 64 is accurately regulated by the mold thickness adjusting screw portion 76B, the lock member 68 operates reliably and stably.

The configuration and operation of the present invention have been described above.
As is clear from these explanations, in the mold clamping device of the present invention, since the boost cylinder 66 that moves up and down the upper mounting plate 64 does not project upward from the connecting plate 78, the overall height of the device is set low. can do. Next, since the mold clamping cylinder 52, which has a heavy structure and may cause oil leakage, is set to the lowest position, firstly, the weight of the movable portion loaded on the upper mounting plate 64 is reduced, and the stability of the apparatus is improved. In addition, the operability is improved, and in particular, the operation cycle can be easily shortened. In addition, the troubles such as the contamination of the die surface due to the oil leakage are prevented, and the most troublesome maintenance of the packing of the mold clamping cylinder can be easily performed by extending the mold thickness adjusting screw portion 76B. Further, since the mold clamping device of the present invention has the engagement phase matching means 70,
It has an advantage that the mold can be easily attached and replaced. The mold clamping device of the present invention is most preferably applied to a vertical mold clamping device of an injection molding machine, but other equipment and applications such as a horizontal mold clamping device of an injection molding machine and a press. It can also be applied to devices and the like.

The preferred embodiments of the mold clamping device of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments, and many design changes can be made without departing from the spirit thereof.

[Effect of device]

As is apparent from the above-described embodiments, according to the mold clamping device of the present invention, the mold clamping cylinder (52) fixed on the base (50) and the vertically moving piston part (52) of the mold clamping cylinder.
Standing on a lower mounting plate (56) formed on the A) side for mounting one half mold (54) of the mold, and a substrate (58) formed on the fixed cylinder section (52B) side of the mold clamping cylinder. An upper mounting plate (64), which is movably held in the vertical direction on the tie rod (60) and on which the other half mold (62) of the mold is mounted,
It is fixed to the lower mounting plate (56) and the upper mounting plate (6
4) The boost cylinder (66) that moves up and down, and the engagement part (60A) that is provided on the anti-die mounting side of the upper mounting plate (64) and is formed on the outer peripheral surface of the tie rod (60). A lock member (68) having a half nut (68A) that can be engaged, and means (72) for detecting an engagement phase difference between the tie rod engagement portion (60A) and the half nut (68A). In the mold clamping device, a computing device (74) for computing an adjustment distance in the axial direction of the tie rod (60) between the tie rod engaging portion (60A) and the half nut (68A) based on the phase difference detected by the detecting means (72). And the mold clamping cylinder (52)
Move the lower mounting plate (56) with the lock member (68).
After the relative movement of the die, a die thickness adjusting screw portion (76B) driven by a gear mechanism is provided between the lower mounting plate (56) and the base plate (58) of the fixed cylinder portion (52B), and the arithmetic unit (74). By providing a moving device (76) for moving the device based on the calculation result of, the height of the entire device is basically made as low as possible without the boost cylinder projecting upward, and the safety of the device is improved. In the structure of the mold clamping device that can improve the performance and prevent damage due to contamination of the mold surface due to oil leakage, when adjusting the lower mounting plate (56) during mold replacement, the mold clamping cylinder ( With the lower mounting plate (56) raised by 52), the moving device (76) can be used to operate the mold thickness adjusting screw (76B), so adjustment can be made without applying a load to the moving device (76). be able to. Therefore, the moving device (76) can be made compact.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a mold clamping device according to the present invention, FIG. 2 is a partially cutaway side view showing a conventional mold clamping device (press device), and FIG. It is a partially notched side view which shows another mold clamping apparatus. 50 …… Base 52 …… Clamping cylinder 52A …… Vertical movement piston 52B …… Fixed cylinder 54 …… Mold 56 …… Lower mounting plate 56A …… Stopper 58 …… Board 60 …… Tie rod 60A …… Screw engaging part 62 …… Mold 64 …… Upper mounting plate 66 …… Boost cylinder 68 …… Lock member 68A …… Half nut 68B …… Opening / closing cylinder 70 …… Engagement phase matching means 72 …… Detecting member 74… … Computing device 76 …… Moving device 76A …… Gear tube 76B …… Mold thickness adjusting screw 76C …… Pinion 76D …… Servo motor 78 …… Coupling plate

Claims (1)

[Scope of utility model registration request] 1. A mold clamping cylinder (52) fixed on a base (50), and a vertically moving piston portion (52) of the mold clamping cylinder.
Standing on a lower mounting plate (56) formed on the A) side for mounting one half mold (54) of the mold, and a substrate (58) formed on the fixed cylinder section (52B) side of the mold clamping cylinder. An upper mounting plate (64), which is movably held in the vertical direction on the tie rod (60) and on which the other half mold (62) of the mold is mounted,
It is fixed to the lower mounting plate (56) and the upper mounting plate (6
4) The boost cylinder (66) that moves up and down, and the engagement part (60A) that is provided on the anti-die mounting side of the upper mounting plate (64) and is formed on the outer peripheral surface of the tie rod (60). A lock member (68) having a half nut (68A) that can be engaged, and means (72) for detecting an engagement phase difference between the tie rod engagement portion (60A) and the half nut (68A). In the mold clamping device, a computing device (74) for computing an adjustment distance in the axial direction of the tie rod (60) between the tie rod engaging portion (60A) and the half nut (68A) based on the phase difference detected by the detecting means (72). After moving the lower mounting plate (56) by the mold clamping cylinder (52) to relatively move the lock member (68), the lower mounting plate (56) and the base plate (58) of the fixed cylinder part (52B). ) And the screw part for mold thickness adjustment driven by a gear mechanism (76B)
And a moving device (76) for moving the device based on the calculation result of the calculating device (74).