JP2736564B2 - Mold mounting mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold mounting mechanism in a molding machine.

2. Description of the Related Art In a molding machine using a mold, the mold needs to be replaced when the product to be molded is changed.

When changing the mold, in order to avoid the danger of replacing the mold due to the heavy weight of the mold and the large workload, transfer the mold from the standby position to the side of the mold clamping section, and then move the mold from that position. In some cases, a mold conveying / feeding device that feeds between a fixed platen and a movable platen of a tightening portion is used.

However, the conventional mold conveying / feeding device only needs to convey and feed the mold, and the operator has to perform fine positioning and clamping. In addition, it is large and expensive.

On the other hand, in molding a small product such as a lens, the mold is relatively small, and an appropriate mold conveying / feeding device is necessary, but the above-mentioned large-scale one may not be necessary.
Particularly, in the case of small-lot production of many kinds, the molds are frequently exchanged, so that a simple one is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold mounting mechanism that can be used for various kinds and small-quantity productions, requires much less time for mold replacement, and can be configured relatively inexpensively. .

Means for Solving the Problems A mold mounting mechanism provided with a mounting portion provided on a mold mounting surface of a fixed platen, a die, and a die pressing device.

The mounting portion has a mold engaging groove parallel to the mold mounting surface of the fixed platen, penetrating in the left-right direction, and having an opening formed in the rear surface.

The mold has an engaging portion fitted to the engaging groove of the mounting portion at the front portion, and the engaging groove and the engaging portion are configured such that the engaging portion fitted to the engaging groove is movable in the left-right direction. However, it has a cross-sectional structure that is positioned in the front-back and up-down directions.

The die pushing device includes a ball screw / nut mechanism. The ball screw has a length extending from one end to the other end of the mounting portion and is arranged in parallel with the engagement groove of the mounting portion. The nut screwed to the ball screw is supported by a frame formed integrally with the mounting part,
Driven by a pushing servomotor. At the inner end of the ball screw, a pushing body that can move left and right along the engagement groove is mounted.

A clamp is provided on the mounting part to fix the mold at the use position.

The mold may be provided with a groove penetrating in the left-right direction on the upper and lower surfaces and an engaging portion formed by a convex portion formed by the groove.

The mold is mounted on the fixed platen by the engagement portion between the mounting portion and the mold.

The mold pushing device moves the mold to the use position using the mold engagement groove.

The ball screw / nut mechanism and the servo motor for pushing position the mold at the correct position.

Embodiment FIG. 2 shows the entirety of an injection molding apparatus 1 constructed using a mold mounting mechanism of the present invention, and comprises an injection molding machine main body 2 and a mold transfer apparatus 3.

The injection molding machine main body 2 includes a fixed platen 4, a movable platen 5, and a rear platen 6, and the fixed platen 4 and the rear platen 6 are connected by a diver 7, and the movable platen 5 can freely move back and forth between them. The movable platen 5 and the rear platen 6 are connected by a toggle link mechanism 8, and when the link mechanism 8 is driven by a mold clamping motor 9, the movable platen 5 moves back and forth.

The fixed platen 4 and the movable platen 5 form a mold clamping unit 10, and the fixed-side mold 13 a and the movable-side mold 13 b are mounted on the mold mounting surfaces 11 and 12 of these platens 4 and 5. Reference numeral 13 denotes a fixed die and a movable side which are joined and integrated until they are attached to the mold clamping portion 10 by a mold.

The fixed platen 4 also has a mounting part 14 and a die pushing device 15 provided at the left end thereof.

The conveyor 3 is fed to the left side of the mold
And a left and right conveyor 17, a right and left conveyor 18, a right and left conveyor 19, and a turntable 20 and a corner conveyor 21 connecting these as a transport route. The turntable 20 includes a pushing device 22 by an actuator.

Therefore, the mold 13 sent out from the mold clamping unit 10 to the right front-rear direction conveyor 18 is sent rearward, and
After the front-to-back direction is changed with respect to the traveling direction, it is placed on the left and right conveyor 19 by the push-feed device 22, is placed on the left front-rear conveyor 17 via the corner conveyor 21, moves forward and reaches the feed conveyor 16, and again. The system returns to the mold clamping unit 10.

As shown in FIG. 1, the mounting portion 14 has a horizontal column shape and is disposed between the upper and lower tie bars 7 above and below the four tie bars 7, and is longer than the fixed platen 4.
Is mounted on the mold mounting surface 11. The mounting portion 14 is provided with a dovetail groove engagement 23 on the mold mounting surface 11, and the mounting portion itself moves right and left with respect to the fixed platen 4 from a molding position P1 shown by a solid line in FIG. It is mounted so that it can move in the direction. At the molding position indicated by the solid line, one end of the mounting portion projects to the left about the width of the feed conveyor 16. The molding position P1 and the feed-out position P2 of the mounting portion 14 with respect to the fixed platen 4 are respectively set in the clamp holes 24 (a, b, c... FIG. 5) provided on the upper surface of the mounting portion 14 on the mold mounting surface side of the fixed platen 4. Is maintained by fitting the pin of the stop clamp 25 fixed to the stop.

The mounting portion 14 has a T-shaped mold engaging groove 27 which is parallel to the mold mounting surface 11 and penetrates in the left-right direction, and has an opening 26 formed on the rear surface and has a T-shaped mold sideways inclined in cross section ( (Fig. 3a).
The groove 27 is formed by cutting out a rear engaging portion in the left half of the mounting portion 14 and merely forming a U-shaped groove 27 ′ opened rearward. A stay 28 is provided below the mounting portion 14 so as to protrude downward. A ball screw 30 arranged in the left-right direction in parallel with the mounting portion 14 is screwed into the ball nut 29, and the ball screw 30 is attached to the fixed platen 4 side (the machine frame side of the injection molding machine 1). It is driven by the fixed feed servo motor M1.

Except during the molding operation, the fixed mold 13a and the movable mold 13b are joined and integrated with each other as shown in FIG. 4 except for the molding operation, but the front part thereof (the front part of the fixed mold 13a corresponds to the front part). ) Is formed with an engaging portion 31 that fits into the mold engaging groove 27 of the mounting portion 14 described above.

The engaging portion 31 is formed by a groove 32 penetrating in the left-right direction on the upper and lower surfaces of the front portion of the mold, and a convex portion 33 formed thereby. Further, the contacting portion with which the pin 35 of the positioning clamp 34 (FIG. 1) for fixing the left and right positions of the mold with respect to the mounting portion 14 fits and contacts is shown in FIGS. 3 (a) and 4 (b). In the case shown, the concave portion 36 is provided at the center in the left-right direction of the front side of the convex portion 33.
It is formed with. The location of the contact portion and the cross-sectional shape can be variously configured. For example, as shown in FIG.
It may be formed in a trapezoidal cross-section in communication with 32, or may be formed in a wedge-shaped cross-section at the center in the left-right direction on the upper surface of the projection 33 as shown in FIG.

Although not shown in this embodiment, the rear portion of the mold 13 (portion of the movable mold 13b) has a normal clamping structure and is assumed to be automatically clamped to the movable platen 5.

The mold pressing device 15 is provided at the left end of the mounting unit 14 and moves left and right integrally with the mounting unit 14. And this device 15 is composed of a pushing servomotor M2 and a ball screw / nut mechanism.
37, which are connected to the mounting part 14 by a frame 38. The ball screw 39 has a length extending from one end of the mounting portion 14 to the other end thereof, is disposed in parallel with the above-described mold engagement groove 27 of the mounting portion 14 and is supported by a frame 38, and the frame 38 The ball-nut 40 is rotatably supported by a shaft and is screwed. As shown in the figure, the ball nut 40 is linked to the pushing servomotor M2 by a timing gear and a timing belt 41, and the ball screw 39 is moved to the left end as a home position. The first stage movement of moving the mold 13 to the use position (the position in FIG. 1) and the second stage operation of further pushing the mold 13 from the right end of the mounting portion are possible.

The ball screw 39 is provided at the inner end with a mold engaging groove of the mounting portion 14.
Cross-shaped pusher made of hard synthetic resin that moves along 27
It has 42.

The pressing body 42 moves in the mold engagement groove 27, but in the left half of the mounting portion 14, the rear surface of the engagement groove 27 is opened and the movement becomes unstable. Mold engagement groove 27
The upper and lower surfaces and the front surface are further provided with guide grooves 43 in which the upper and lower ends and the front end of a cross-shaped pusher 42 are fitted.

In FIG. 1, reference numeral M3 denotes a motor for driving the feed conveyor 16, and reference numeral M4 denotes a motor for driving the left front-rearward conveyor. The description of other conveyor motors is omitted.
Also, in FIG. 1, the feed conveyor 16 and the left front-rear direction conveyor 17 are shown slightly away from the die pushing device 15 and the like. FIG. 5 is a diagram for explaining the operation and is described above. In addition to the structure, limit switches L1 to L3 are displayed, and furthermore, automatic clamp and stop clamp 25 for the movable mold,
The automatic clamp mechanism such as the positioning clamp 34 has a function of transmitting a completion / release state of the clamp.

The drive of the servomotors M1 to M4, as well as the operation of the clamping of each part, as well as the servomotor 9 for mold clamping in the main body 1 of the injection molding machine, are under the control of the NC device provided in the main body 1 of the injection molding machine. The signals from the limit switches L1 to L3 and the signals from each clamp are transmitted to the NC device. NC devices are well-known, and include PMC CPU, NC CPU, RAM, ROM, and shared RAM associated with them, as well as servo circuits, output circuits (D / O), input circuits (D / I), and servo interfaces and servos. A drive circuit is provided, and system programs such as injection molding and mold replacement are provided.

Now, in FIG. 5, when the molding using the mold A is completed, and then the molding using the mold B (located on the left front-rear direction conveyor 17) is started, the next mold exchanging operation is performed. Will be

When a mold change command is entered on a program or manually,
The movable platen 5 is moved to the mold touch position, and the movable mold 13b is joined to the fixed mold 13a.

The processing inside the NC device in this case is roughly as follows.

Upon receiving the mold change command, the PMC CPU issues a command to move the movable mold to the mold touch position to the NC CPU, and in response thereto, the NC CPU determines the mold touch position stored in the shared RAM. The pulse is read out and the necessary pulse distribution is performed to the mold clamping servomotor 9, whereby the mold clamping servomotor 9 is rotated by a corresponding amount via the servo circuit. Then, upon reaching the in-position position of the mold touch, a mold touch completion signal is transmitted to the PMC CPU via the shared RAM.

After confirming the mold touch completion signal, the clamp for the movable mold and the positioning clamp 34 for the fixed mold 13a are released.

The stop clamp 25 is released and its pin is
Removed from b.

The movable platen 5 is slightly retracted to the set predetermined position.

The feed servomotor M1 is driven, and the mounting unit 14 is moved to the position P2.

In this case, the following processing is roughly performed inside the NC device. That is, the PMC CPU issues a command to move the mounting section 14 from the P1 position to the P2 position (FIG. 5) to the NC CPU via the shared RAM, and the NC CPU writes the command to the shared RAM via the servo interface. Current position (B
Reads the position of P2, which was previously set to 1) and was written to another register of the shared RAM, and distributed the pulse corresponding to the rotation amount of the feed servo motor M1 required for the movement, thereby responding through the servo circuit. The feed servo motor M1 is driven by the specified amount, and when it reaches the P2 position, a movement completion signal is sent back to the PMC CPU via the shared RAM. Therefore, it is omitted).

The stop clamp 25 is driven, and its pin is inserted into the clamp hole b,
c, the mounting portion 14 is positioned with respect to the fixed platen 4.

The pushing servomotor M2 is driven to move the ball screw 39 to the second stage, and the die A at the use position is pushed out onto the right front-rear direction conveyor 18 by the pushing body 42 at the tip thereof. In addition,
The first step position and the second step position of the ball screw 39 are fixed values determined in advance by a machine, and are set in the NC device.

Release the stop clamp 25 and insert the pin into the clamp holes b and c.
Pull out from.

Drive the feed motor M1 to return the mounting portion 14 to the P1 position,
Further, the pushing servomotor M2 is driven to return the ball screw 39 to the home position.

Activate the stop clamp 25 and insert the pin into the clamp holes a and b.
And the mounting portion 14 is fixed to the fixed platen 4.

The PMC CPU reads the signal of the limit switch L1 relating to the infeed conveyor 16 from the D / I, and when it is confirmed that the switch L1 is off, drives the motors M3 and M4 via the D / O, and Is moved to the infeed conveyor 16.
The motors M3 and M4 stop when the limit switch L1 is turned on.

For PMC CPU, limit switch L1 from D / I is on and L
2. When the signal that L3 is off is confirmed, the motor M3 is driven via the D / O and the feeding conveyor 16 pushes the mold B into the left half of the mounting portion 14. When both the limit switches L2 and L3 are turned on by the mold B, the motor M
3 stops. The limit switch L1 is turned off by this movement of the mold B. In addition, limit switch L
The position and posture of the mold B when both L2 and L3 are turned on, when this is linearly pushed rightward,
Reference numeral 31 denotes a position where the fitting portion 14 appropriately fits into the mold engaging groove 27.

When the PMC CPU confirms that the signals of the limit switches L2 and L3 from the D / I are both ON, it commands the ball screw 39 to move to the first stage, and the NC CPU issues a push servo motor. M2 is driven to move the mold B to the use position.

Upon receiving the movement completion signal, the positioning clamp 34 is operated, and the pin 35 is fitted into the concave portion 36 (groove 32).

The movable platen 5 moves to the mold touch position. Activate the automatic clamp on the movable mold side.

 In this way, the exchange of the mold is completed.

In the final stage, the ball screw 39 that has sent the mold B to the use position may be returned to the home position, or may be maintained at the same position. Further, in this embodiment, the mold 13 arranged on the conveyor of the transfer device 3 is used.
Is preferably set so that the two dies are not placed on the infeed conveyor 16 at the same time.
Can be achieved by adjusting the feed speed of each of the conveyors.

As described above, at the time of mold replacement, the mold A at the use position is automatically ejected, and the mold 13 pushed into the mounting portion 14 is also automatically arranged at the use position. Time is greatly reduced.

In addition, since the mold pressing / moving device 15 uses the ball screw / nut mechanism 37 and a servomotor is used for driving the same, the mold can be accurately discharged and positioned at the use position.

Further, the mold 13 having the engaging portion 31 can be positioned in the front-rear direction only by being fitted into the mounting portion from the side, and the movement and discharge to the use position slides the mold. Just done easily.

 The above is the embodiment.

The mounting portion 14 may be formed integrally with the fixed platen 4 or may be one that can be attached to and detached from the fixed platen 4 like a mold. In this case, the place of the mold in the above description is a core for the mother die, and the mold of the present invention also includes a replaceable core.

Die transporting means (transporting device 3) and die B
The means for pushing into 14 (feeding conveyor 16) may be any other suitable device having the same function.

The configuration in which the mounting portion 14 itself is moved in the left-right direction with respect to the fixed platen 4 is not essential. However, in this case, the mounting section 14
An intermediate support roller is required between the right end of the device and the transfer device 3 for smooth transfer of the mold.

Mold 13 to be prepared (the configuration of the engaging portion 31 is unified)
When there is a change in the dimension in the left-right direction, the stroke of the first-stage operation of the ball screw 39 in the above embodiment may be changed by detecting the dimension. It should be noted that there is no particular effect even if there is a change in the dimension in the front-rear direction (mold thickness).

Advantageous Effects of the Invention The labor of the operator required for mold replacement is greatly reduced, and in particular, a large number of types and a small amount of molding operations can be efficiently performed.

In combination with the structure of the mold having the engaging portion, a mold mounting mechanism capable of automatically changing the mold can be provided simply and at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part, FIG. 2 is a plan view, and FIG.
Fig. 3 is a longitudinal sectional view of a main part along the line II in Fig. 1, Figs. 3 (b) and 3 (c) are longitudinal sectional views of a main part in another embodiment, Fig. 4 is a perspective view, Fig. 5 FIG. 4 is a mechanism diagram for explaining the operation. 11 ... Mounting surface of fixed platen mold, 13 (a, b) ... Mold, 14 ... Mounting part, 15 ... Mold pusher, 37 ... Ball screw / nut mechanism, 42 ... Press Moving body, M2: Servo motor for pushing.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Susumu Ito 3580 Kobaba, Oshino-mura, Oshino-mura, Minamitsuru-gun, Yamanashi Pref. 3580 No. FANUC Co., Ltd.Product Development Research Center (72) Inventor Kikuo Watanabe Fukushima Co., Ltd.Product Development Research Center, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture 3580 Kobaba FANUC CORPORATION Product Development Laboratory (72) Inventor Toshio Matsukura 2-43 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industrial Co., Ltd. (72) Inventor Kaoru 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Olympus Optical Co., Ltd. (72) Invention Hiroshi Yonekubo 2-43-2, Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Kenji Haga 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industries Co., Ltd. (72) Inventor Tokuda Kazunari 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (1)

(57) [Claims] 1. A fixed platen comprising a mounting portion provided on a mold mounting surface of a fixed platen, a die, and a die pressing device. The mounting portion penetrates in the left-right direction in parallel with the die mounting surface of the fixed platen. A mold engaging groove having an opening formed in a rear surface thereof, the mold including an engaging portion fitted in the engaging groove of the mounting portion at the front portion, and the engaging groove and the engaging portion are engaged. The engaging portion fitted into the groove has a cross-sectional structure in which the engaging portion is movable in the left-right direction, but is positioned in the front-rear and up-down directions. The die pushing device has a ball having a length from one end of the mounting portion to the other end. A screw is arranged in parallel with the engaging groove of the mounting portion, a nut screwed to this is axially supported on a frame formed integrally with the mounting portion side, and the nut is interlocked and connected to a servomotor for pushing, and a ball screw A pusher that can move to the left and right along the engagement groove is attached to the inner end, and the mold is placed in the mounting position at the use position. Mold mounting mechanism characterized in that clamp the constant is provided.