JP2610197B2 - Core exchange mechanism - Google Patents

Description

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

2. Description of the Related Art A molding machine using a mold changes the mold when changing a molded product. When the molded product is small and is produced in a variety of types and in small quantities, only the core in which the molding cavity is formed may be replaced in the mold.

The core is relatively lightweight and easy to handle in view of the weight of the entire mold, but there is no molding machine provided with a core exchange mechanism.

SUMMARY OF THE INVENTION An object of the present invention is to provide a core exchange mechanism that can be used for automatic core exchange.

Means for Solving the Problems A molding machine is provided with a core stocker and a core exchange arm, and these operations are controlled by an NC device provided in the molding machine.

The core stocker is for assembling a fixed side and a movable side to store a plurality of cores as a pair.

The core exchange arm reciprocates between a predetermined core storage position of the core stocker and a core mounting position of the mother die in the mold.

Operation The core stacker assembles the fixed side and the movable side and stores a plurality of cores as a pair, and arranges any cores at the transfer position.

The core exchange arm moves the core in the core stacker transfer position to the mother core mounting position, or conversely, moves the core in the mother die core mounting position to the core stacker core transfer position. Transport.

The NC device reciprocates the core exchange arm in accordance with the molding timing of the molding machine.

FIG. 1 shows a mold clamping unit 1 of an injection molding machine, which is provided with a core changing mechanism 2 according to the present invention.

As the mold clamping unit 1, a fixed platen 3, a movable platen 4, and a tie bar 5 are illustrated.

The core exchange mechanism 2 is configured on the fixed platen 3 side as shown in FIG. 2, and includes a core stocker 6 and a core exchange arm 7.

For convenience of explanation, the side of the fixed platen 3 is defined as the front, and the side of the movable platen 4 is defined as the rear.

A fixed-side mold 8a is fixed to the fixed-side platen 3, and the mold 8a includes a core 9a. The movable mold 8b has a core 9b.

The core 9 (a, b) has a cylindrical structure as a whole as shown in FIG. 3, and a molding cavity (for a lens) is formed on the joint surface between the fixed core 9a and the movable core 9b. I have. And
An annular groove 10 is formed on the outer periphery at the front part of the fixed-side core 9a,
The movable-side core 9b has a tapered surface whose rear portion is narrowed in the mounting direction.

Core replacement mechanism 2, servo motor M ₁ for driving the the core changer arms 7 as in the second view, the extrusion actuator 1
1. It has a return actuator 12.

The core exchanging arm 7 has a tip portion formed in the core holding portion 13,
In this embodiment, a ring (FIG. 4) having an inner diameter substantially matching the outer shape of the core 9 is used.

The base of the core exchange arm 7 is supported by a single tie bar 5 so as to be rotatable around the tie bar 5 at a fixed position. Core exchange arm 7
Is supported by a single tie bar 5 at a position close to the fixed platen 3.

The opening of the core holder 13 moves parallel to the rear surface of the fixed platen 3. The inner surface of the hole is covered with a soft metal such as brass to protect the core.

A gear G1 is fixed to the base of the core exchange arm 7, and the servomotor attached to the top of the fixed platen 3 is fixed to the gear G1.
The gear G2 of M1 meshes. The operation of the servo motor M1 is controlled by an NC device (numerical control device) 14 provided in the molding machine.

The push actuator 11 and the return actuator 12 are operated by solenoid valves 15 and 16 with air actuators.
The solenoid valves 15 and 16 are two-way switching valves for switching between air supply and exhaust to the actuators 11 and 12, and are switched by a command from the NC device 14. Each of the pistons of the actuators 11 and 12 has a spring inside thereof, protrudes by a predetermined stroke by air supply, is quickly retracted by the internal spring by exhaustion, and returns to the home position.

The core stocker 6 has a plurality of storage holes 17 (through holes) that can store a plurality of cores 9 along the circumference as shown in the figure.
And is rotatably supported by a stay 18 attached to the fixed platen 3 with a shaft 19 in the front-rear direction.
The core stocker 6 is disposed such that its rear surface is located forward of the bottom surface of the core mounting groove 20 in the fixed master block 8a (second
Figure).

A gear G3 is fixed to the outer periphery of the core stocker 6, and the gear G3 of the servomotor M2 attached to the top of the stay 18 meshes with the gear G3. Operation of servo motor M2 is NC device
Controlled by 14.

The core stocker 6 has a core preliminary temperature control function for each storage hole 17 for storing the core 9.

The push actuator 11 and the return actuator 12
A predetermined position with respect to the core stocker 6, that is, any one of the cores 9 stored by rotating the stocker 6 can be disposed between both actuators 11 and 12. The core stocker 6 is interposed at a fixed position that the core holding unit 13 can reach, that is, at the core transfer position E, facing the front and rear (second example).
Figure).

The arrangement of the pushing actuator 11 and the amount of protrusion of the piston are determined by moving the core 9 (a and b are fitted and integrated) accommodated in the storage hole 17 of the core stocker 6 from the front to the rear. This is an amount that can be protruded and transferred to the core holding unit 13. The arrangement of the return actuator 12 and the amount of protrusion of the piston are determined by the core 9 held by the core holding unit 13.
Is pushed back into the storage hole 17 of the stocker 6 and released from the core holder 13.

Therefore, the core holder 13 is located between the return actuator 12 and the rear surface of the stocker 6, and is arranged to rotate along the rear surface of the stocker 6.

The width (thickness) of the core holding portion 13 in the front-rear direction is set to be slightly smaller than the interval when the mother dies 8 (a, b) are closest to each other in the mold clamping state.

Letter S ₂ designates intended to detect whether the core 9 in the gap between the core holding portion 13 and the core stocker 6 in the transfer position by the photoelectric sensor is present, turned on in the absence. The reference numeral S ₃ is a magnetic sensor, disposed at the entrance of the core housing hole 17, and detects whether the core 9 is present in the receiving hole 17, turned on when the person is present .

Here, a dovetail-shaped core with an open rear is attached from the top surface to the position of the sprue bush 18 at the center of the master block 8a, as shown in FIGS. A groove 20 is formed along the trajectory of the core exchange arm 7 in the core exchange mechanism 2, and the sprue bush 21 (the sixth
A stopper 22 is arranged in the vicinity of FIG.

The core mounting groove 20 has a dovetail-shaped cross section wide on the entrance side, and at the core mounting position D at the end, is a groove having a dimension exactly matching the outer shape of the core 9 with the sprue bush 21 as a center, There is no backlash in the core 9 attached here.

Further, the stopper 22 is disposed from the front side of the master block 8a to the rear and penetrates the master block 8a, and is driven by the air actuator 23. The air actuator 23 includes an electromagnetic valve 24 that operates according to a command from the NC device 14. The solenoid valve 24 is a two-way switching valve that switches between an air supply side and an exhaust side of the actuator 23.

On the other hand, as shown in FIG. 7, the center of the movable master block 8b corresponds to the core mounting position D end of the core mounting groove 20, as shown in FIG.
A tapered core mounting hole 25 (FIG. 7) whose peripheral surface is slightly narrowed inward is formed.

A hole 28 (FIG. 7) through which an eject rod 27 of a core projecting device 26 described later penetrates is formed in the movable-side core 9b,
An eject pin 29 having a diameter smaller than the diameter of the hole 28 is slidably disposed in the front end side in the front-rear direction. A return spring 30 for urging the eject pin 29 rearward is disposed in the hole 28.

The core protruding device 26 is a through-type servo motor M3 mounted on the center of the rear surface of the movable platen 4, and its motor shaft
An eject rod 27 directly connected to the motor shaft 31 and solenoids 32 disposed on both sides of the motor shaft 31;
Penetrates from the rear surface of the movable platen 4 into the core mounting hole 25 of the mother die 8b, and the hole is provided when the movable core 9b is mounted.
It is arranged so as to be slidably fitted in a hole 33 leading to 28.

The penetrating servo motor M3 has a configuration in which the motor shaft 31 is a ball screw that allows only sliding in the axial direction and has a ball nut that rotates with the rotor inside.
Controlled by 14. When the motor M3 is driven, the motor shaft 31 is directly moved back and forth in the axial direction.

The eject rod 27 is protruded forward to perform a first-stage operation in which only the eject pin 29 is pushed to project the product, and a second-stage operation in which the eject rod 27 is further advanced to project the movable side portion 9b of the core forward. It has become.

Further, the plunger 34 of the solenoid 32 is operated in a short time, and is a kind of electromagnetic hammer that is abutted against the core 9b.

The through servomotor M3 can be replaced by a two-stage air actuator or the like.

FIGS. 8 (a), (b), (c) and (d) show an example of the core exchange processing performed by the NC device.

When a code for a newly used core (selected core) is input and a core replacement command is input, first, the rotation position of the core replacement arm 7 is changed from the rotation position of the servomotor M1 to the mounting position ( It is determined whether or not the center position of the matrix 8 is a position (a position at which the molding operation is performed) P1 (step S200). In addition,
The rotation position of each servomotor is stored in the shared RAM by the NC device 16.

When the position of the core exchange arm 7 is P1, it means that the core 9 is attached to the mother die 8, so the cleaning operation is performed by retracting the movable platen 4 once to the set position P3. (Step 202).

When the cleaning operation is completed, the movable platen 4 is moved to a position P4 just before the position touched by the core 9 (a, b) by a small amount δ (step 203).

Drive servo motor M3 to eject rod 27
It is moved to a position P5 slightly before touching 9a, 9b (step 204).

The solenoid 32 is actuated for a short time to apply an impact force to the core 9b fitted to the master block 8b on the movable platen 4 side, so that the core
The engagement of the tapered surface between 9b and the matrix 8b is released (step 205).

It is determined at predetermined time intervals (by the timer of the NC device) whether the eject rod 27 has reached the set position P5 (steps 206 to 208).
Repeat the blow with 32. When the movement of the eject rod 27 is completed, the servo motor M3 is set to the torque limit control, and the movement command is set to a position P6 at which the core 9b completely comes out of the core mounting hole 25 of the master block 8b (step S209).

At the same time, the core 9b is
Then, at a speed such that the movable platen 4 moves at a speed slightly lower than the moving speed, a movement command to the core replacement position P7 is issued, the movable platen 4 is retracted, and the mold opening operation is performed (step S210).

The eject rod 27 moves to the set position P6 by driving the servo motor M3, and a movement completion signal is sent (step S211). As a result, the movable-side core 9b is pressed and held in a state of being in close contact with the fixed-side core 9a, and remains on the fixed platen 3 side.

The eject rod 27 is retracted to the home position P8, the electromagnetic valve 24 is turned off, and the lock of the core 9a to the master block 8a is released by the air actuator 23 (steps S212 and S213).

Even if the eject rod 27 no longer presses the core 9b, the core 9 (a, b) is formed by the guide pin between the fixed-side core 9a and the movable-side core 9b. 8a.

Next, the movable platen 4 is moved to the position P7 (Step S214).

Drive the servo motor M1 to move the core replacement arm 7 to the position P2 corresponding to the storage hole 17 of the core stocker 6 (the position shown in FIG. 5).
(Step 215). Since the core stocker 6 is prevented from rotating after the core 9 is taken out, when the core replacement arm 7 is positioned at the position P2, the center position of the core holding part 13 of the replacement arm 7 is the core. 9 matches the center position of the storage hole 17 from which the 9 is taken out.

The core 9 held by the operation of the actuator 12 is pushed toward the accommodation hole 17. (Step S216).

It is determined whether the photoelectric sensor S2 is on and the magnetic sensor S3 is on. The core 17 indicates that the photoelectric sensor S2 is on.
Is not detected, and that the magnetic sensor S3 is ON means that the core 9 is stored in the storage hole 17 of the core stocker 6 (steps S217 and S218). Then, when the photoelectric sensor S2 is turned on and the magnetic sensor S3 is turned on, it means that the core 9 is completely housed in the housing hole 17, and the actuator 14 is returned (step S1).
S219).

The NC device 14 reads the core storage hole position relating to the selected core 9 to be used next from the table, and drives the servo stocker M2 to position the core stocker 6 so as to set the core 9 to the transfer position E. (Step S220).

The push-out actuator 11 is driven to insert the selected core into the core holder 13 (Step S221).

While the core is moving from the storage hole 17 to the core holding portion 13, the photoelectric sensor S2 detects the core and is off, and the magnetic sensor S3 has the core 9 partially remaining in the core storage hole 17. As long as it is on. The core 9 moves to the core holding unit 13, the photoelectric sensor S2 is turned on to detect no core, and the magnetic sensor S3 is turned off so that there is no core part in the core storage hole 17. Is detected (steps S222 and S223), the pushing actuator 1
1 is restored (step S224).

Drive the servo motor M1 and set the core exchange arm 7 to the master 8a.
(Step S22)
Five).

The solenoid valve 24 is turned on, and the core 9 is locked to the master block 8a by the air actuator 23 as shown in FIG. 6 (step S2).
26).

Then, the movable platen 4 is moved to the set mold clamping force position by driving the servo motor M0 (step 22).
7). The core 9b is fitted into the core mounting hole 25.

Thereby, the core 9a is fixed to the matrix 8a on the fixed platen 3 side, and the core 9b is fixed to the matrix 8b on the movable platen 4 side.

The movable platen 4 is moved to the position P9 to open the mold (step S228).

 Thus, the core exchange process is completed.

The core replacement command issued in a state where the core 9 is not mounted on the mother die 8 is substantially a core mounting command,
In step S200, the NC device 16 detects that the position of the core replacement arm 7 is not at the mounting position P1, and shifts from step S200 to step S220 to perform the following processing.

Further, if the core is simply removed from the mother die instead of exchanging the core, only the processing from step S200 to step S221 is performed.

FIG. 9 shows a second embodiment, in which a core exchanging mechanism 2 has a core exchanging arm 7 having a core holding portion 13 at a distal end and a driving mechanism thereof.
35 and a core stocker 6.

A tapered core mounting hole 25a similar to the core mounting hole 25 (25b) of the movable core 9b in the master 8b is formed in the master 8a, and solenoids 36 used as electromagnetic hammers are formed on both sides thereof. Are located. The configuration of the movable master block 8b is the same as that of the first embodiment, but the joint surfaces of both the master blocks 8a and 8b are also close to each other when the mold is clamped, and the entire core 9 is wrapped. The difference is that the structure is clamped by the shape.

Each of the cores 9a and 9b has a cylindrical structure as a whole as shown in FIG. 10, and a molding cavity (for a lens) is formed in a joint surface between the fixed core 9a and the movable core 9b. The outer peripheral surfaces on the mounting side are formed on tapered surfaces 40 (a, b) narrowing in the mounting direction.

The fixed-side core 9a includes a flange 37 and an engagement groove 38.
The engagement groove 38 has a wall 39 at the rear and the tapered surface at the front
It is naturally interrupted and opened by crossing with 40a.

Further, a portion of the fixed core 9a projecting from the flange 37 toward the movable platen 4 is a holding projection 41 held by the core replacement arm 7.

Also, the inner peripheral surface for attaching the cores 9 (a, b) to the matrix 8 (a, b) as shown in FIG.
A core mounting hole 25 (a, b) narrowing in the mounting direction of (a, b) is formed.

When the fixed-side core 9a is mounted on the mother die 8a, the flange 37 comes into contact with the rear surface of the mother die 8a as shown in FIG. 9, and the solenoid 36 is located in front of the flange 37.

The core exchange arm 7 rotated by the servo motor M1 is configured as an air actuator and is extendable and contractable.
As shown in FIG. 11, the core holding portion 13 is formed at the tip of the piston. The cross section of the piston 42 is quadrangular and cannot be rotated only by expansion and contraction with respect to the cylinder side. An electromagnetic hammer 44 comprising the solenoid 36 and its plunger 43 is attached to the plunger 43. Can be brought into contact with the flange 37 of the fixed core 9a pressed into the core mounting hole 25a of the mother die 8a.

An electromagnetic hammer 45 comprising a solenoid 32 and a plunger 34 and a penetrating servomotor M3, and an actuator 46 comprising an eject rod 27 directly connected to the motor shaft 31 are attached to the movable platen 4, as shown in FIG. The plunger 34 of the hammer 45 and the eject rod 27 of the actuator 46 penetrate the movable platen 4 and the movable matrix 6b, respectively, and can reach the bottom surface of the core 9b. The core 9b is a core insertion hole of the platen 4.
It is press-fit into 25b.

The servo motor M3 is under the control of the NC device (numerical control device) provided in the injection molding machine, and the eject rod 27 is protruded forward and pushes only the eject pin in front of it to project the product in the first stage. Then, the second stage operation of further moving forward and projecting the movable side core 9b forward is performed.

In the movable platen 4, the electromagnetic hammer 45 and the actuator 46 form a projecting device 47 for the movable core 9b, and the device 47, the tapered surface 40b of the core 9b and the matrix 8
The engagement structure of the core mounting hole 25b with the tapered surface 40b constitutes a core mounting mechanism.

The core exchange arm 7 is configured as an air actuator, is extendable and contractable, and is rotated by a servo motor M1.

The core holding portion 13 is a U-shape with an upper finger and a lower finger, and is open at the tip end side.
Is provided. When the stopper 48 is protruded, it fits into an engagement groove 38 (FIG. 10) formed in the movable core 9b.

On the other hand, a servomotor M2 is fixed to the fixed platen 3 side, and a ball screw 49 is suspended in the front-rear direction.
Is connected to a servomotor M1 for driving the core exchange arm 7. Therefore, when the servo motor M2 is driven, the core exchange arm 7 is moved back and forth together with the ball nut 50.

The core stocker 6 has a disk shape and a plurality of core accommodation holes 17 around the core.
Having. Reference numeral 12 denotes a return actuator, which is fixedly arranged in conformity with the transfer position E.

When the molding operation using the pair of cores 9 (a, b) is completed, the cores 9 are replaced in the following manner.

After the mold clamping unit 1 is in the mold clamping state and the fixed-side core 9a and the movable-side core 9b are joined, the core 9a is slightly retracted, and
Make a small gap between (a, b).

The electromagnetic hammer 45 in the movable platen 4 operates,
The bottom surface of the movable core 9b pressed into the movable master block 8b is hit (may be several times). This makes core 9b
The engagement between the tapered surface 40b and the tapered surface of the core mounting hole 25b is released. The gap is eliminated.

The actuator 46 of the ejecting device 47 is operated to the second stage, and the core 9b is driven by the predetermined torque of the servomotor M3 into the master 8b.
The movable platen 4 is retracted while projecting from
9b is left on the fixed side. The remaining movable-side core 9b is joined to the fixed-side core 9a to form a pair, so that it does not drop (the state of FIG. 9).

Servo motor M1 of drive mechanism 35 in core exchange mechanism 2
Is rotated in the forward direction, and the core replacement arm 7 is
Then, the piston 40 is extended and the core holding portion 13 at the tip holds the core 9 (FIG. 9). The holding part is the holding protrusion of the fixed side core 9a.
41.

 The stopper 48 is fitted into the engagement groove 38 of the core 9a.

The electromagnetic hammer 44 of the fixed platen 3 operates to strike the flange 37 of the core 9a, thereby releasing the engagement between the tapered surface 40a of the core 9a and the core mounting hole 25a of the fixed master block 8a.

The servo motor M2 of the drive mechanism 35 is driven in the forward direction, and the entire core replacement arm 7 holding the core 9 is retracted (same as above). Then, the core 9 (a, b) disengaged from the fixed master block 8 a is pulled backward from the master block 8 a by the stopper 48 of the core holding portion 13.

The core exchange arm 7 is shortened, and then the core 9 held by rotating the servo motor M1 in the reverse direction is set to the transfer position E of the core stocker 6 (same as above).

 The stopper 48 is pulled out of the engagement groove 38.

The return actuator 12 is operated to push the held core 9 back into the storage hole 17.

The core stocker 6 rotates and the core 9 to be mounted next is set to the delivery position E.

Due to the reverse rotation of the servomotor M2, the core exchange arm 7 moves forward to hold the core 9 in the core holding portion 13.

 The stopper 48 is fitted into the engagement groove 38.

Servo motor M2 rotates forward to retract core exchange arm 7,
The core 9 is pulled out from the core storage hole 17.

Due to the reverse rotation of the servomotor M3, the core exchange arm 7 is rotated in the opposite direction to the above, and the core 9 is inserted into the core mounting hole of the fixed-side mother die 8a.
Position 25a.

Servo motor M2 is reversed and core exchange arm 7 moves forward,
The fixed platen side of the held core 9 is slightly inserted into the core mounting hole 25a of the fixed mother block 8a.

The movable platen 4 is advanced, and the movable platen side of the core 9 is inserted into the core insertion hole 25b of the movable mother block 8b, so that the core 9 is supported by two platens (3, 4).

The stopper 48 is retracted, and the engagement with the core 9a is released.

After the core replacement arm 7 is shortened, it is rotated in the forward direction, the core holding part 11 is retracted from the mold clamping part, and stops at that position. The core 9 is supported by two platens at the front and rear and does not fall.

The movable platen 4 is further advanced to bring the dies (the mother die 8 and the core 9) into a mold clamped state. This allows both cores (a,
b) are both press-fitted into the respective core fitting holes 25 (a, b) to be positioned and fixed to the matrix 8 (a, b).

Thus, the replacement of the core is completed, and the process proceeds to the injection molding process.

Such an operation is possible by controlling the solenoids of the servomotors M1, M2, M3 and the electromagnetic hammers 44, 45 by a program stored in the NC device of the injection molding machine.

In the second embodiment, unlike the first embodiment, a long core mounting groove 20 extending from the top surface of the mother die 8a to the core mounting portion D is not required.

In the third embodiment shown in FIG. 12, the reciprocating movement of the core exchange arm 7 (the transfer position E of the core stocker 6 and the core mounting position D
2) indicates a linear motion, and the core mounting groove 20 provided in the matrix 8a mounted on the fixed platen 3 is formed linearly. Further, the core stocker 6 moves up and down in a vertical rack shape and arranges the accommodated core 9 at the transfer position E. The core holding portion 13 is provided with the stopper 48 in the second embodiment, or has a structure for opening and closing the upper finger and the lower finger, and particularly when holding the core when returning to the transfer position E from the mounting position D of the core. It is necessary to provide a structure that can be engaged.

The above is the embodiment, the mounting operation of the core is not limited to the above, and the attaching and detaching directions of the core 9 are up and down, left and right,
Alternatively, various things such as before and after can be adopted.

The wrist of the part holding the core may be rotatable.

Effect of the Invention The core exchange can be automated, and various and small amount molding operations can be performed efficiently and continuously.

[Brief description of the drawings]

1 is a perspective view, FIG. 2 is a schematic plan view, FIG. 3 is a perspective view, FIG. 4 is a perspective view of a main part, and FIG. 5 is I in FIG.
FIG. 6 is a front view of a main part showing a part in cross section, FIG. 7 is a front view of a main part showing in cross section, FIG. (B), (c) and (d) are flowcharts of the core exchange process, FIG. 9 is a plan view schematically showing the second embodiment, FIG. 10 is a perspective view, FIG. 11 is a perspective view of a main part, No.
FIG. 12 is a perspective view schematically showing the third embodiment. DESCRIPTION OF SYMBOLS 1 ... Clamping part, 2 ... Core exchange mechanism, 6 ... Core stocker, 7 ... Core exchange arm, 8 ... Mother, 9 ... Core, 13 ...
... Core holder, 20 ... Core mounting groove, 25 ... Core mounting hole, 26 ... Core ejector, 44,45 ... Electromagnetic hammer.

Continued on the front page (72) Inventor Susumu Ito 3580 Kobaba, Oshino-son, Oshino-mura, Minamitsuru-gun, Yamanashi Pref. (72) Inventor Kikuo Watanabe 3580 Kobaba, Oshino-mura, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture FANUC Co., Ltd. Address FANUC CORPORATION Product Development Laboratory (72) Inventor Toshio Matsukura 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industrial Co., Ltd. (72) Inventor 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 Kenji Haga Shibuya-ku, Tokyo Months valley 2-chome 43 address No. 2 Olympus Optical Co., Ltd. in the (72) inventor Kazunari Tokuda Shibuya-ku, Tokyo Hatagaya 2-chome 43 address No. 2 Olympus Optical Co., Ltd. in

Claims (3)

(57) [Claims] 1. A core stocker in which a plurality of cores are stored as a pair by assembling a fixed side and a movable side, a predetermined core transfer position of the core stocker, and a core mounting position of a mother die in a mold. A core exchanging arm which reciprocates between the arm and the core exchanging mechanism, wherein the operation of the exchanging arm and the operation of the core stocker are controlled by an NC device provided in the molding machine. 2. The core exchange mechanism according to claim 1, wherein a mounting groove for guiding the core from a peripheral edge thereof to a core mounting position is formed in the matrix fixed to the fixed platen. 3. A core stocker in which a fixed platen is a mother die itself for a core of a mold, and a fixed stocker in which a fixed side and a movable side are assembled and a plurality of cores are stored as a pair.
A core exchange arm that reciprocates between a predetermined core transfer position and a platen core mounting position for the core stocker,
The molding machine was equipped with the operation of the exchange arm and the operation of the core stocker.
Core exchange mechanism controlled by NC equipment.