JP2673839B2 - Mold - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mold having a core suitable for core replacement using a robot.

2. Description of the Related Art In a molding machine using a mold such as an injection molding machine, in the case of various types of small-quantity production, only the core of the mold may be replaced to shorten the time required for the mold replacement.

For this reason, the use of a core changing robot is considered. In this kind of robot, the arm moves like a product take-out device, and when replacing the core, after removing the core from the mold dies attached to the movable platen and fixed platen respectively, and storing it in the core stocker Then, a new core to be used is taken out from the core stocker and attached to the mother die of each mold.

However, in order to accurately and accurately convey the core held by the robot's hand to the position of the mounting hole of the mother die and properly fit it in this mounting hole, the robot arm should have high rigidity and be precise. It requires control and is expensive. In order to avoid such a situation as much as possible, the movable side core and the fixed side core are assembled together in advance, this is first attached to the movable side mold, and then the movable side platen is moved to move the solid side. Although it is considered that the core is attached to the fixed-side mother die and the assembly of both cores is finally released, the front and rear dimensions of the integrally assembled core are long, so the movable platen and the fixed platen are attached at the time of attachment. It is necessary to widen the space between them, and there is a problem that the cycle time for core replacement becomes long.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide a mold that does not require strict control of the transfer of the core by the robot at the core mounting position in core replacement using a robot.

Means for Solving the Problems The movable side mold and the fixed side mold are each composed of a mother die and a core.

A temporary fixing rod and a positioning pin for temporarily fixing the core of the opposite die are provided on the parting surface of each mother die.

The temporary fixing rod has a hook-shaped end and is provided so as to be retractable from the parting surface of the mother die.

The positioning pin is provided so as to project from the parting surface to the other side.

Each core is provided with a flange on the parting surface side, and the parting surface side is provided with an engaging hole with which the hook-shaped part of the tip of the temporary fixing rod engages and a positioning hole with which the positioning pin fits. To be done.

Each mother die is further provided with means for rotating the hook-shaped portion at the protruding and retracting positions of the temporary fixing rod and for fixing the mounted core therein.

By the temporary fixing of the mating core by the working temporary fixing rod and the positioning pin, the core is accurately determined on the parting surface of the other mold to which the core is to be mounted.

Embodiment FIG. 2 shows mechanically the part of the injection molding machine for carrying out the present invention. The core exchanging device 2 and the core stockers 3a, 3b are attached to the mold clamping part 1 of the injection molding machine. Are arranged.

The mold clamping unit 1 has a normal configuration and includes a fixed platen 4, a movable platen 5 and a rear platen 6. The fixed platen 4 and the rear platen 6 are connected by a tie bar 7, and the movable platen 5 is movable in the front-rear direction with respect to the tie bar 7. It is installed.

The movable platen 5 is connected to the rear platen 6 by a mold clamping mechanism 8, and the mold clamping mechanism 8 is driven by a mold clamping servomotor 9 attached to the rear platen 6.

A fixed side mold 10a is attached to the fixed platen 4 and a movable side mold 10b is attached to the movable platen 5 by a clamp 11 (Fig. 1). These molds 10 (a, b)
Is composed of a matrix 12 (a, b) and a core 13 (a, b), and each core 13 is detachable from the matrix 12.

The cores 13 (a, b) are formed to have the same outer dimensions, and as shown in FIG. 3, each has a cylindrical body 14 (a, b).
b) and the flange 15 formed on the parting surface side
(A, b) is provided. The flange 15a is long in the Y-axis direction when the central axis of the main body 14 is the Z-axis (front-back direction), and the flange 15b is long in the X-axis direction.

Engagement grooves 16 (a, b), 17 (a, b) having a flat bottom surface with a certain distance in the front and back extending on the X-axis direction on the back side and the ventral side of the core body 14 (a, b). ) Has been formed. Further, the flange 15 (a, b) is formed with an engaging hole 18 (a, b) for temporary fixing which penetrates in the Z-axis direction and a positioning hole 19 (a, b) in the vicinity thereof in the vertical position. Engaging holes 20 (a, b) for main fixing are formed in the Y-axis direction on the upper and lower end surfaces of the flange 15 (a, b). A projecting edge 21 is formed on each of the parting surface sides of the temporary fixing engagement holes 18 (a, b) (FIG. 5).

The cores 13a and 13b are flanged as shown in FIG.
The cavity and the core of the parting surface are formed so that the molds are clamped in a form in which 15a and 15b are orthogonal to each other.

As shown in FIG. 3 for the movable side 12b, the mother die 12 (a, b) has a central core mounting hole 22b and a lock pin 23 arranged so as to project inside the hole 22b. It has a fixed rod 24b and a positioning pin 25b.

The core mounting hole 22b has a structure that conforms to the form of the core 13b described above as shown in FIG. 4, and the lock pin 23b is provided in the recess into which the flange 15b is fitted so that the main fixing air actuator 26b.
It is driven by and comes in and out. The main fixing air actuator 26b is a means for permanently fixing the core in this embodiment.

The temporary fixing rod 24b is a rod whose tip is formed in the hook-shaped portion 27, to which the pinion gear 28 is fixed, and can be moved back and forth in the Z-axis direction by an air actuator 29b for temporary fixing. Further, the mother die 12b has a plunger 31 having a rack gear 30 at its front end portion, and has a rotating air actuator.
32b is attached, and the rack gear 30 meshes with the pinion gear 28 described above. The pinion gear 28 is Z
It is long in the axial direction, and in meshing relation with the rack gear 30, it can cope with the forward and backward movement of the temporary fixing rod 24.

That is, the air actuator 29 for temporary fixing, the pinion gear 28, the air actuator 32 for rotating, the plunger.
In this embodiment, the rack gear 30, the rack gear 30 and the like constitute means for rotating the hook-shaped portion 27 at the protruding and retracting positions of the temporary fixing rod 24 and the protruding position thereof. By this means, the temporary fixing rod 24b is projected from the parting surface of the mother die 12b as shown in FIG. 4 and rotated about 90 °, and the retracted position (temporary fixing screw 24b) completely retracted from the parting surface. Home position) and.

The positioning pin 25 has a tapered tip and
As shown in the figure, it is fixed to the parting surface of the mother die 12b so as to project toward the fixed-side die 10a.

Although the fixed side is attached to the mother die 12a, illustration and description thereof are omitted, but the positions of the temporary fixing rod 24a and the lock pin 23a are displaced by 90 ° relative to the case of the movable side, and there is no particular difference.

The core exchanging device 2 is a robot having a cylindrical coordinate system.
It is attached so that it can move in parallel with
A telescopic arm 35 is horizontally rotatably attached to the arm 35, and an openable and closable gripping hand 36 is attached to the end of the arm 35. The height of the arm 35 is between the upper and lower tie bars 7 and 7 when the mold clamping unit 1 is viewed from the front, and when the arm 35 is contracted, the tip of the hand 36 is tie bar 7, 7 of the mold clamping unit 1 in plan view. Is configured to be located outside the. Arm 35
The home position is a position H in which the main body portion 34 points toward the mold clamping portion 1 at the center of the base portion 33 in the front-rear direction and the arm length is contracted, and the arm 35
The turning range is 90 ° to the right and 90 ° to the left from the front. And
When the mold clamping unit 1 is in the mold open state, when the arm 35 is extended at the home position, the tip hand 36 enters from the front side between the fixed and movable molds 10 (a, b) to the core mounting position A. To reach. Further, when the arm 35 is contracted and rotated to the left as it is, the tip of the hand 36 reaches the movable side core take-out position B, and when turned to the right, the fixed side core take-out position C is reached.

The core stocker 3 (a, b) has a structure in which a plurality of gripping devices 37 (a, b) arranged along a vertical rotation surface facing the mold clamping unit 1 are supported by a rotating shaft 38. 37 (a, b) has a scissor-like structure that can be opened and closed like the hand 36.

Then, the core stocker 3a storing the fixed core 13a.
As shown in FIG. 2, the core 13a is stored by gripping the front engaging groove 16a of the main body 14a of the core 13a, and the movable core 13b is stored in the core stocker. In 3b, the core 13b is stored by gripping the position of the rear engagement groove 17b in the main body 14b. In addition, the core stocker 3 (a, b) is selected by rotating the core 13 (a, b)
Are placed at core removal positions C and B.

In the above, the mold clamping servomotor 9, the core changing device 2, the core stocker 3 (a, b), and the main fixing air actuator 2 in the mother die 12 (a, b) are driven.
6. The drive of the temporary fixing air actuator 29, the rotating air actuator 32, and the like is under the control of an NC device (numerical controller) provided in the injection molding machine.

The core 13 (a, b) exchange operation is performed as follows based on the core exchange program stored in the NC device by setting the NC device in the core exchange mode. As an initial state of this mode, the temporary fixing rod 24 (a, b) and the hand 36 of the core exchanging device 2 are in their home positions,
The lock pin 23 (a, b) of the mother die 12 (a, b) is in a position engaged with the main fixing engagement hole 18 (a, b) of the mounted core 13 (a, b). . Furthermore, the core stocker 3 (a, b) maintains the position when the core currently used is taken out last time, and the gripping devices 37 (a, b) at the core take-out positions B, C do not show what is. Is not gripped (the core is shown in FIG. 1 for convenience of explanation).

When it is confirmed that the movable platen 5 is at the mold touch position, the left and right temporary fixing air actuators 29a in the fixed-side mother die 12a are driven, and the temporary fixing rod 24 is projected.
Then, the rotating air actuator 32 is driven in the forward direction. As a result, the hook-shaped portions 2 at the tips of the left and right temporary fixing rods 24a are formed.
7 enters the temporary fixing engagement hole 18b in the flange 15b of the movable side core 13b, and after rotating to engage the projecting edge 21,
Since the movable core 13b is attracted, the movable core 13b is temporarily fixed to the parting surface of the stationary mother die 12a.

The main fixing air actuator 26b of the movable side mold 12b is operated in the opposite direction, and the main fixing of the movable side core 13b and the mold 12b by the lock pin 23b is released.

The mold clamping servomotor 9 is driven to move the movable mold 10b.
Is retracted to a position (core replacement position) having a space L3 slightly larger than the length L1 of the front and rear of the core 13b plus the space L2 with respect to the fixed mold 10a (Fig. 6).

In this case, inside the NC device, including the above-mentioned confirmation work, the PMC CPU operates various parts together with the NC CPU based on commands from the core replacement program to operate each part, and If drive is needed, finally NC
The CPU for CPU performs appropriate pulse distribution and drives the above-mentioned mold clamping servomotor 9 and the like via the servo circuit. However, since the signal exchange and processing method or contents during this period are the same as before, the following operation is performed. Only the explanation will be given, and the explanation about the processing inside the NC device will be omitted.

The arm 35 extends from the home position H to reach the core device position A, and the hand 36 grips the core 13b that is temporarily fixed to the fixed-side mother die 12a. Grip position is core 13b
These are the engaging grooves 16b on the front side of the body 14 of FIG.

The rotating air actuator 32a and the temporary fixing air actuator 29a are driven in the opposite directions to release the temporary fixing between the fixed-side mother die 12a and the movable-side core 13b.

After the main body 34 of the robot moves L2 to the left and slightly separates the core 13b from the parting surface of the mother die 12a, the arm 3
5 is contracted together with the movable side core 13b, and the movable side core 13b is taken out from the mold clamping unit 1.

The arm 35 is rotated 90 ° to the left as it is to rotate the core 13b.
Is the core removal position B.

Grasping device at core removal position B of core stocker 3b
Open 37b.

The core 13b which the arm 35 extends and grips is transferred to the gripping device 37b. The gripping device 37b grips the rear engagement groove 17b of the core 13b, and the hand 36 of the core replacing device 2 releases the grip of the core 13b.

The arm 35 contracts at that position, turns to the mold clamping unit 1, that is, stands by at a position displaced from the home position H to the left by L2. This completes the removal of the movable core 13b.

 The movable platen 5 is set to the mold touch position again.

The fixed core 13a is temporarily fixed to the parting surface of the movable mother die 12b by the upper and lower temporary fixing rods 24b on the movable side in the same manner as described above.

The main fixing by the lock pin 23a is released, the movable platen 5 retracts, and the fixed core 13a is taken out from the fixed mold 12a.

The arm 35 of the core changing device 2 extends from the above position to grip the core 13a. The hand 36 of the arm 35 grips the rear engagement groove 17a of the core 13a.

Air actuator 29b for temporary fixing of movable mold
Then, the rotating air actuator 32b is rotated in the opposite direction, and the temporary fixing of the movable side mold 12b and the fixed side core 13a is released.

The main body 34 of the robot moves to L2 to the right and separates the core 13a from the parting surface of the movable-side mother die 12b.

The core 13 that the arm 35 contracts and rotates to the right and grips
a is transferred to the gripping device 37a of the core stocker 3a.

This completes the removal of the fixed core 13a.
The gripping device 31a of the core stocker 3a grips the front engaging groove 16a.

The arm 35 stands by at the home position H with the direction of the mold clamping unit 1.

Then, the core stocker 3 (a, b) is rotated and the movable side mold 13 (a, b) to be used next is conveyed to the take-out positions B and C, respectively.

The arm 35 is rotated 90 ° to the right to the core take-out position C, and then it is extended and fixed with the hand 36 to the fixed side core 13a (new).
To grip. The gripping device 37a at the take-out position C of the core stocker 3a releases the grip. The core gripping position of the hand 36 is the engagement groove 17a at the rear portion.

The arm 35 contracts together with the core 13a, returns to the home position H, and then extends. Core 13a is core device position A
Becomes

The main body 34 moves leftward by L2, and the flange 15a of the fixed core 13a is pressed against the parting surface of the movable mold 12b. At this time, the positioning pin 25b on the parting surface of the movable mold 12b is fitted into the positioning hole 19a of the flange 15a to correct the position and posture of the fixed core 13a correctly.

The upper and lower temporary fixing air actuators 29b and the rotating air actuator 32 of the movable side mold 12b are driven in the forward direction, and the temporary fixing rod 24b moves the fixed side core 13b to the movable side mold.
It is attracted and temporarily fixed to the parting surface of 12b (No. 7).
Figure).

The arm 29 contracts and stands by at a position displaced from the home position H to the left by L2.

The movable platen 5 is advanced to the mold touch position together with the stationary core 13a, and the stationary core 13a is mounted on the stationary mother die 12a. The fixed core 13a is fitted in the core mounting hole 22a.

The temporary fixing air actuator 29b and the rotating air actuator 32 on the movable side are driven in the opposite directions to move the temporary fixing rod 29b.
24b is set to the retracted position, and at the same time, the main fixing air actuator 26a in the fixed-side mother die 12a operates to lock the lock pin 23a.
Is engaged with the engagement hole 19a of the fixed core 13a.

As a result, the fixed core 13a (new) is fixed to the fixed mold 12a.

 The movable platen 5 is again set to the core replacement position.

The arm 35 rotates 90 ° to the left to move the hand 36 to the core take-out position B, and then extends at that position to make the hand 36 move the core 13
Hold b (new). The grip position is the engagement groove 16b at the front part.

The gripping device 37b at the take-out position B of the core stocker 3b
Opens to release the grip of the core 13b.

The arm 35 contracts, then turns to the mold clamping unit 1 side and extends together with the movable side core 13b to move the core 13b to the core mounting position A.
And

The main body 34 is moved rightward by L2. The flange 15b of the movable core 13b abuts the parting surface of the fixed side mold 12a, and the positioning pin 25a fixed to the parting surface from the fixed side mold 12a is fitted into the positioning hole 19b. Since the tip of the pin 25a is tapered as described above, even if the position of the core 13b is slightly displaced, the pin 2a
The position is corrected by fitting with 5a.

Air actuator 2 for temporary fixing in fixed side mold 12a
9a and the rotating air actuator 32 are driven in the forward direction, and the left and right temporary fixing rods 24a move the movable side core 13b to the fixed side mother die 12.
Attach it to the parting surface of a and temporarily fix it.

The hand 36 opens to release the grip of the core 13b, and the arm 35 contracts to return to the home position H.

The movable platen 5 advances from the core replacement position to the mold touch position, and the movable side core 13b is moved to the core mounting hole 22 of the movable side mother die 12b.
Fit with b.

The movable-side main fixed air actuator 26b is actuated in the forward direction so that the lock pin 23b is engaged with the main fixing engagement hole 20b of the core 13b.
And the core 13b is fixed to the mother die 12a. At the same time, the temporary fixing air actuator 29a and the rotating air actuator 32a of the fixed-side mother die 12a are driven in opposite directions, and the temporary fixing of the movable-side core 13b and the fixed-side mother die 12a is released.

This completes the attachment of the movable core 13b (new).

 This completes the entire core exchange process.

The core 13 (a, b) is not attached to the mother mold 12 (a, b),
When the core 13 (a, b) is newly mounted, the operation is the same as that after the core 13 (a, b) currently used is removed.

In the above operation, the cores (a, b) are temporarily fixed to the parting surface of the master mold of the mating mold at the time of attachment / detachment. Therefore, when removing from the master mold, grasp with the robot hand 36. It is easy, and when it is mounted, if it is conveyed to the temporary fixing position by the hand 36, it is arranged in the correct position and the correct posture by the temporary fixing operation of the core.

In addition, the range in which the movable platen 5 is moved during the core replacement is the mold touch position and the core replacement position, and the distance is slightly larger than the length of one core 13a or 13b in the Z-axis direction (L3). Is.

 The above is a description based on the first embodiment device.

In the practice of the present invention, a screw rod or an electromagnet capable of intermittent magnetic force can be used for temporarily fixing the core 13 (a, b), which is driven in and out.

INDUSTRIAL APPLICABILITY The present invention can be used not only in an injection molding machine, but also in a molding machine using a mold provided with a core.

The expansion and contraction and rotation of the arm 35, the movement of the drive platen 5 and the movement of the core stocker in the core exchanging device 2 can be overlapped.

Advantageous Effects of the Invention A core as a core exchanging device can be replaced with a robot relatively easily and accurately.

When exchanging the core, the movable platen moves a small distance, so that the core exchanging cycle is shortened.

Since the cores to be handled are separate on the fixed side and the movable side, the robot arm is not required to have that much strength, and as a result, the core can be replaced by an inexpensive device in addition to the above.

[Brief description of the drawings]

1 is a front view (partially omitted) of the main part shown in cross section, FIG. 2 is a plan view showing the overall mechanism, FIG. 3 is a perspective view, FIG. 4 is a perspective view, 5 is a cross-sectional view of a main part, FIG. 6 is a plan view of the main part with a part omitted, and FIG. 7 is a plan view of the main part with a part omitted. 1 ... Mold clamping unit, 2 ... Core changing device, 3 ... Core stocker, 12 ... Mother mold, 13 ... Core, 24 ... Temporary fixing rod, A ...
… Core mounting position, B, C …… Core removal position.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B29C 33/76 B29C 33/76 45/36 45/36 (72) Inventor Susumu Ito Minamitsuru-gun, Yamanashi Prefecture Oshinomura Shinobi Kozaba 3580 Address FANUC Co., Ltd. Product Development Research Center (72) Inventor Takayuki Taira Oshino Village Minamitsuru-gun Minamitsuru-gun Oshinomura Shinobuba 3580 Address FANUC Co., Ltd. Product Development Research Center (72) Inventor Watanabe Kikuo Yamanashi Prefecture 3580 Kobuba, Oshinomura, Minamitsuru-gun, Fukunaba Co., Ltd. Product Development Research Center (72) Inventor, Akira 3580, Oshinomura, Otsunomura, Minamitsuru-gun, Yamanashi Prefecture 3580 Fanac Co., Ltd. Product Development Research Center (72) Inventor, Toshio Matsukura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Invention Kaoru Maeda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Hiroshi Yonekubo 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Haga Kenji 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Issei Tokuda 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

(57) [Claims] 1. A movable side mold and a fixed side mold are each composed of a mother die and a core, and the tip for temporarily fixing the core of the counterpart die to the parting surface of each mother die has a hook-shaped portion. The formed temporary fixing rod is provided in a retractable manner, and positioning pins protruding from the parting surface to the other side are provided, and a flange is formed on the parting surface side of each core, and the tip of the temporary fixing rod is formed on the parting surface side. Means for engaging with the hook-shaped portion of the base and a positioning hole for fitting the positioning pin, and means for rotating the hook-shaped portion at the protruding / retracting position of the temporary fixing rod and the protruding position thereof in each mother die. And a mold comprising means for permanently fixing the mounted core.