JPH05220750A - Core changing method of mold and molding apparatus employing core changing type mold - Google Patents

Abstract

PURPOSE:To provide a core changing method capable of readily changing the core in a core changing robot and an apparatus thereof regarding an injection molding apparatus employing a core changing type mold. CONSTITUTION:A movable side core 30b is forwardly projected only at the predetermined distance with respect to a movable side matrix 35b, subsequently a stationary side matrix 35b is moved forwardly at the predetermined distance with respect to a stationary side core 30a so as to form the handle insertion gap of a core changing robot. The movable side core part and stationary side core part on both sides of a core parting line CPL exposed on the gap are held together, and the core 30 is removed from the mold clamping part of the molding apparatus by the operation of the core changing robot. Furthermore, there is provided core extruding means for forwardly extruding the movable side core 30a relative to the movable side matrix 35b and core drawing means for forwardly moving the stationary parent mold relative to the stationary side core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus provided with a core-exchangeable mold and a core exchange method therefor.

[0002]

2. Description of the Related Art A core-replaceable mold is provided with a mother die and a core on each of a fixed side and a movable side, and a molding machine using the die has a movable side die as a fixed side platen and a movable side die as a movable platen. It is possible to change the molded product by replacing the core while it is attached. Therefore, the molding apparatus mainly including such a molding machine is suitable for producing small-sized molded products in various types in small quantities.

However, since it is difficult to take out the core from the mother die by the core exchanging robot for exchanging the core, a satisfactory automation has not yet been made, and manpower is required for exchanging the core. For this reason, the core-exchangeable molding apparatus cannot operate for a long period of time even if other conditions are substantially satisfied.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a core replacing method in which a core replacing robot can easily take out the core, and a molding apparatus for executing this method.

[0005]

[Means for Solving the Problems]

[Method] The following steps are taken when the core is taken out. The movable-side core is caused to project forward by a predetermined distance (d ₁ ) with respect to the movable-side mother die. While maintaining the protruding state of the movable side core, press the fixed side core forward with the movable side core,
Position the parting line of the core in place from the die mounting surface of the stationary platen. The fixed side mold is moved forward with respect to the fixed side core by a predetermined distance (d ₂ ) to form a hand insertion gap of the core changing robot between the rear surface of the fixed side mold and the front surface of the movable side mold. At the same time, the core parting line is positioned in the hand insertion gap.

After the movable side core part and the fixed side core part on both sides of the core parting line are clamped by the robot hand all at once, the movable side mold is retracted and the movable side core is removed from the mold. , The sandwiched core is taken out from the mold clamping part of the molding device by the operation of the core exchange robot.

In the process of taking out the core, in order to project the movable side core forward by a predetermined distance (d ₁ ) with respect to the mother die, the movable side mold is retracted with respect to the fixed side mold to a predetermined distance. A space of (d ₁ ) is formed, the movable side core is projected at this space, and in order to obtain a predetermined distance (d ₂ ), the fixed side is fixed to an intermediate plate which is provided on the fixed side mold and is adjustable in the front-rear position. A structure in which the core is inserted and locked to be attached, and the intermediate plate and the fixed-side core are unlocked and the intermediate plate is moved forward,
This is one preferable concrete method. When pressing the fixed core with the movable core, it is one preferable specific method to dispose a positioning jig between the main body of the fixed mold and the intermediate plate.

[Apparatus] A molding apparatus, which is a molding machine, a core changing robot, a mold including a combination of a mother die and a core,
The core push-out means for projecting the movable core forward with respect to the movable mold and the core push-out means for moving the rear surface of the fixed mold forward with respect to the fixed core are provided for removing the core. Positioning the parting line of the core at a predetermined distance from the die mounting surface of the fixed platen, and forming the hand insertion gap of the core changing robot between the rear surface of the fixed side mold and the front surface of the movable side mold. In addition, a parting line drawing means for arranging the core parting line in the gap is provided.

A state in which the core pushing-out means is compressed between a core locking mechanism arranged between the movable core and the movable mold and the mother mold when the core is mounted on the mold. It is one preferable specific configuration that the movable side core is maintained at the mounting position by the core locking mechanism. It is one preferable specific configuration that the core pushing-out means is a pushing-out mechanism driven by a molded article ejecting mechanism.

It is one preferable concrete construction that the core pushing-out means is provided with a core pushing-out mechanism driven by a molded article ejecting mechanism. The fixed-side mold is composed of a mother mold body and an intermediate plate whose front and rear positions can be adjusted, and the core pushing-out means is fixed to the fixed-side core by moving the intermediate plate forward. It is one preferable specific configuration that the rear surface of the master die is moved forward.

The parting line drawing means is provided with a positioning jig for inserting and withdrawing into and from the gap between the mother die main body and the intermediate plate, and the positioning jig is interposed in the gap between the mother die main body and the intermediate plate and fixed on the movable side core. It is one preferable specific configuration that the parting line of the core is positioned at a predetermined distance from the die mounting surface of the fixed platen by pressing the core together with the jig onto the mother die body.

[0012]

[Operation] By the process of positioning the parting line of the core at a predetermined position from the die mounting surface of the fixed platen,
The core is always placed at an appropriate position for the core exchange robot. Form the hand insertion gap of the core exchange robot,
At the same time, the process of locating the parting line in the hand insertion gap makes it possible to handle the movable side core and the fixed side core simultaneously and surely by the hand of the robot.

The core pushing-out means and the core pushing-out means are parting line drawing means, and when the core is removed, the hand of the core-changing robot is inserted between the rear surface of the fixed-side mold and the front surface of the movable-side mold. A gap is formed and a parting line of the core is arranged in the gap.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An injection molding apparatus is taken as a molding apparatus equipped with a core exchange type mold, and a core exchange method and a configuration for executing this method will be described below. The core replacement method will be described together with the operation of the injection molding apparatus. Figure 1
As shown in FIG. 1, the injection molding apparatus 1 includes an injection molding machine 2, a core replacement robot 3, a core storage device 4, a jig device 5, a temperature control device 6, and a numerical control device for comprehensively controlling these operations. (NC device) 7. It should be noted that other devices such as a molded product take-out device included in the injection molding device 1 will be omitted.

The injection molding machine 2 has a well-known structure including a mold clamping unit 8 and an injection unit 9 located opposite to the mold clamping unit 8. In FIG. 1, only the tip of the injection cylinder of the injection unit 9 is shown by a broken line. Mold clamping unit 8
Includes a fixed platen 10, a movable platen 11 and a rear platen 12 from the front (FIG. 3). The fixed platen 10 and the rear platen 12 are connected by four parallel tie bars 13, and the movable platen 11 is fitted into the tie bar 13 and arranged between the platens 10 and 12, and can be slid back and forth. .. The movable platen 11 is the rear platen 12
Servo motor 1 for mold clamping, which is coupled with the mold clamping mechanism 14.
It is moved back and forth by the drive of 5. A mold 16 is arranged at a mold clamping portion between the fixed platen 10 and the movable platen 11.
The mold 16 is composed of a fixed side mold 17a and a movable side mold 17b. The fixed side mold 17 is mounted on the mold mounting surface of the fixed platen 10.
a is a movable mold 1 on the mold mounting surface of the movable platen 11.
7b are attached respectively. The mold 16 is a core exchange type mold. For convenience of description, the direction of the fixed platen 10 is defined as the front in this specification.

The NC device 7 is connected via an input / output device 18 (FIG. 1) so as to be able to transmit various operation commands to the drive section of each of the above-mentioned devices, and a manual input device, operation panel or It is adapted to receive outputs from various sensors (these are not shown) arranged in each part of the injection molding apparatus 1. Then, the NC device 7 executes control based on the program stored in the memory unit, the set data, and the output from the sensor. The NC device 7 itself has a well-known configuration and operation, and detailed description thereof will be omitted.

As shown in FIGS. 2 and 3, the core-changing robot 3 includes a rail 19 bridged between a fixed platen 10 and a rear platen 12, a movable body 20 fitted in the rail 19, and a movable body that can slide back and forth. A core pinching claw 21 is mounted so as to be movable up and down with respect to 20. The moving body 20 has a ball nut fixed inside screwed onto a ball screw penetrating the inside of the rail 19, and a ball screw is moved by a pawl forward / backward moving motor 22 attached to the rear end of the rail 19. It is moved back and forth by driving. Core pinching claw 21
Is attached to the tip of the piston 24 of the air cylinder 23 which is vertically fixed to the moving body 20 so that the sandwiching surface can rotate between a vertical state (FIG. 2) and a horizontal state (FIG. 3).
Further, it has a function of moving the entire core pinching claw 21 in the horizontal direction orthogonal to the injection axis IL with respect to the tip of the piston 24 and a well-known function of opening and closing the core pinching claw 21 itself.
Reference numeral 25 is a clamping surface rotating motor.

The core storage device 4 is arranged on the upper surface of the cover 26 of the mold clamping unit 8 and is composed of a storage disk 27 which rotates horizontally on the cover 26 and a drive device for the storage disk 27. The storage disk 27 is provided with a large number of bottomed circular holes 28, which are open on the upper surface, in a centered arrangement on the same circumference, and the drive device is provided with a disk motor 29. The storage disk 27 has a bottomed circular hole 2
The rotation locus of 8 is arranged immediately below the horizontal movement locus of the core pinching claw 21 described above (FIG. 1). In FIG. 3, reference numeral 30 is a core, which will be described later together with the mold 16.

As shown in FIG. 3, the jig device 5 includes a stand 31 standing on the upper surface of the fixed platen 10, an air cylinder 32 vertically attached to the stand 31, and a piston 33 thereof.
The positioning jig 34 is attached to the lower end of the. The stand 31 is fixed right above the injection axis line IL set by penetrating the center of the mold clamping unit 8 and the mold 16 in the front-rear direction, and the air cylinder 32 is fixed at that position.
It is possible to project the positioning jig 34 to the position of the core 30 in the mold 16 by projecting it to the rear surface side of 0. The structure and operation of the positioning jig 34 will be described later.

The temperature controller 6 monitors the mold temperature and operates so as to maintain the preset mold temperature. The temperature control device 6 is connected to the temperature control liquid flow path of the mold by a hose, and circulates the temperature control liquid whose temperature is adjusted according to the mold temperature into the mold. The mold 16 is provided with a mother die 35 composed of a first plate to a ninth plate (indicated by numbers in the drawing to replace the reference numerals) and a core 30 which is detachably attached to the mold 35 (see FIG. 4). ).

The first plate to the third plate form a fixed-side mother die 35a. The No. 4 plate to the No. 9 plate form the movable side mold 35b. As described above, the fixed core 30a is fixed to the fixed mold 35a.
Is mounted, and the movable core 30 is attached to the movable mold 35b.
b is attached. Then, the parting line PL of the mold 16 is formed on the rear surface of the third plate and the front surface of the fourth plate, and the core 30 is formed on the joint surface of the fixed core 30a and the movable core 30b.
The parting line CPL of is formed.

The stationary mold 35a has the following structure. Locating ring 36 and sprue bush 37 on the 1st plate from the front, 2nd bush 38 on the 2nd plate, and 3
The number 3 bushes 39 are fixed to the number plate by bolts so that the center axis of the bush 39 is aligned with the injection axis IL. Locate ring 36, sprue bush 37 and second bush 3
8 is a normal structure. The runner following the sprue is formed between the rear surface of the second bush 38 and the fixed core 30a. The No. 3 bush 39 is fitted into a through hole formed in the No. 3 plate, and the inner peripheral surface thereof forms a core mounting hole 40a (FIGS. 9 and 10) for the fixed core 30a.

A flange 41 (FIGS. 4 and 8) that engages with the front surface of the fixed core 30a and determines the front-rear position of the fixed core 30a with respect to the No. 3 plate is provided on the inner peripheral front portion of the No. 3 bush 39. ) Is formed in a ring shape. A front end of a knock pin 42a protruding in the front-rear direction in the core mounting hole 40a (FIG. 10) is fixed to the flange 41. The inner diameter r _{1 of the} flange 41 is the positioning jig 34 (FIGS. 18 and 27) described later.
Larger than the outer diameter of.

An annular temperature adjusting groove 43a and a lock pin through hole 45 through which the lock pin 44a penetrates are formed vertically on the outer peripheral surface of the third bush 39. The temperature adjusting groove 43a is formed in an annular shape surrounding the outer circumference of the No. 3 bush 39 (FIG. 9), and its upper and lower parts are partially closed. The lock pin through hole 45 is formed in these closed portions.

The lock pin 44a is slidably mounted on the No. 3 plate in the vertical direction, and is driven by an air cylinder 46a attached to the outer surface of the No. 3 plate. The air cylinder 46a is a single-acting type that pulls in the lock pin 44a while compressing an internal spring when air is supplied.

It should be noted that, in the figure, for example, the lock pins 44a, etc., which are arranged vertically symmetrically, should be displayed at other corresponding positions in the figure, but the figure becomes complicated. One is omitted to avoid it. That is, the figures used in the description herein should be understood to represent the relative positions and functions of the components.

A plate temperature adjusting hole 47a (FIGS. 8 and 9) is provided in each of the first plate, the second plate, and the third plate, and a communication hole of a holder 48a attached to the outer surface of each plate is used to connect the left and right plates. The plate temperature adjusting hole 47a is connected to form a temperature adjusting liquid flow path. Here, the temperature control passages of the first plate and the second plate are simple type A (FIG. 8) in which the communication holes of the upper holder 48a and the right and left plate temperature control holes 47a are connected. However, in the temperature control passage of the third plate, two left and right plate temperature control holes 47a are connected by the communication holes in the upper and lower holders 48a, and the inner two number plate temperature control holes 47a are three. No. Bush 3
B type of complex flow path which is formed in a ring shape in 9 and is connected to each of the temperature control grooves 43a divided into left and right by upper and lower closing portions and which surrounds the core 30 as a whole and is connected to one. Has become.

One end and the other end of the plate temperature adjusting hole 47a are connected to the temperature adjusting device 6 by a hose 49 for each plate, and the temperature adjusted liquid is circulated in the temperature adjusting liquid flow path. ..

Further, No. 1, No. 2, No. 3 and No. 3 plates are combined in the following relationship (FIG. 4, FIG. 6, FIG. 7). 1
The fixed side guide 50 is fixed to the number plate toward the rear, and the number 2 plate and the number 3 plate are fitted and inserted in the guide holes 51 provided in these. The fixed-side guide 50 extends rearward through the third plate, penetrates the fourth plate described later, and reaches the fifth plate. The No. 3 plate is provided with a guide hole 53 that is fixed to the No. 4 plate and is inserted into a movable guide 52 extending forward. The third plate is fixed to the rear end of the piston 55 of the air cylinder 54.

Two air cylinders 54 are arranged on the front surface of the fixed platen 10 at diagonal positions of the fixed platen 10.
The piston 55 is attached so that the direction of expansion and contraction is front and back (FIGS. 1 and 3), and its piston 55 penetrates through the fixed platen 10, the 1st plate and the 2nd plate. The air cylinder 54 is a return type. However, the force by which the cylinder 54 pushes the No. 3 plate backward is sufficiently smaller than the force by which the movable platen 11 is moved forward by the mold clamping servomotor 15 and the mold clamping mechanism 14, and the No. 3 plate is simply moved to the No. 4 plate. It is only about to contact the plate. Therefore, when the movable platen 11 pushes the No. 3 plate and moves forward, the resistance that is a problem does not occur. The structure in which the two air cylinders 54 are arranged at diagonal positions of the fixed platen 10 causes the injection unit 9 to swivel (horizontal rotation).
This is to avoid interference between members when the injection cylinder collides with each other.

A No. 2 plate stopper pin 56 and a No. 3 plate stopper pin 57 are integrally fixed to the No. 2 plate in the front-rear direction on the same axis (FIG. 7). The rear portion of the second plate stopper pin 56 is in the engagement hole 58 of the first plate, and when the mold 16 is completely closed, the engagement bulge portion at the front end is the secondary engagement distance from the bottom portion of the engagement hole 58. It is arranged so as to have a front-rear direction margin of only d ₃ . The No. 3 plate stopper pin 57 projects rearward from the No. 3 plate, and when the mold 16 is completely closed, the engaging bulge portion at the rear end is a margin of the primary engaging distance d ₄ with the rear surface of the No. 3 plate. Have been made. The protruding portion of the third plate stopper pin 57 enters the holes 59 prepared in the fourth plate and the fifth plate when the mold 16 is closed.

The guides 50 and 52, the guide holes 51 and 53, and the stopper pins 56 and 57 are arranged four at left and right and up and down symmetrically with respect to the injection axis IL (FIG. 9). In addition, although not shown, fixing bolts and knock pins for positioning are also symmetrically arranged to achieve mechanical balance.

The above is the configuration of the fixed-side mother die 35a. The movable side mold 35b has the following configuration. The No. 4 bush 60 is fixed to the No. 4 plate with bolts. The No. 4 bush 60 is fitted in a through hole formed in the No. 4 plate, and the inner peripheral surface of the No. 4 bush 60 fits the core mounting hole 40b for the front part of the movable core 30b.
(FIG. 10). An auxiliary bush 61 is attached to the rear portion of the fourth bush 60. The diameter of the auxiliary bush 61 is smaller than that of the core mounting hole 40b.
It protrudes like a flange on the inner peripheral side of 0b, and the position of the movable core 30b with respect to the No. 4 plate is determined at this portion. Further, a knock pin 42b is fixed to this portion by protruding forward. A temperature adjusting groove 43b is formed in an annular shape on the outer peripheral surface of the No. 4 bush 60, and the upper and lower parts thereof are partially closed.

A core mounting hole 40c is formed along the injection axis IL in the center of plate No. 5 (FIG. 10), and a lock pin 44b is mounted slidably in the vertical direction. The pin 44b is driven by an air cylinder 46b attached to the outer surface of the No. 5 plate. The air cylinder 46b is a single-acting type similar to the air cylinder 46a. The No. 6 plate is a kind of spacer interposed between the No. 5 plate and the No. 9 plate as shown in FIG. 6, and has a substantial portion only in the peripheral portion and a space 6 in the central portion.
2 is formed. The 7th and 8th plates are lock plates 63
(FIG. 4) and the rear ends of the left and right two return pins 64 (FIGS. 5 and 6) are attached to the guide pin 65 (see FIG. 6). ) Will be guided. The guide pin 65 has a rear end fixed to the No. 9 plate and projects forward.

The lock plate 63 is a plate provided with darma holes 66 (broken lines in FIG. 5) having a small diameter at one end and a large diameter at the other end at two positions vertically, and is a vertical guide formed by plate No. 7 and plate No. 8. It is slidably fitted in the groove 67 (FIG. 4). The lock plate 63 is vertically moved around the position of the injection axis IL by a return type air cylinder 46c attached to the outer surface of the No. 8 plate.

The return pin 64 (FIG. 6) is fixed by sandwiching the flange portion at the rear end between the No. 7 plate and the No. 8 plate, and the front portion penetrates the No. 5 plate and No. 4 plate, and the mold 16 When is completely closed, the front end face abuts against the rear surface of the No. 3 plate on the fixed side and is pushed back to make the No. 7 and No. 8 plates contact the front surface of the No. 9 plate which is the initial position. Reference numeral 68 is a coil spring which is interposed between the No. 4 plate and the No. 7 plate and constantly biases the No. 7 plate and No. 8 plate so as to push them back toward the initial position. Reference numeral 69 is a return pin receiver, and a return pin 64
It is attached to the No. 3 plate corresponding to the tip of.

The rear end of the guide pin 65 is fixed to the 9th plate, and the rod through hole 70 is provided at the position of the injection axis IL.
(FIGS. 4 and 6) are formed, and the core pushing mechanism 71 is formed.
The rear end (Fig. 7) is fixed.

The core push-out mechanism 71 is a spacer 6
It is arranged so as to project forward in the space 62 formed by the number plate,
It is composed of a case 72, a push-out pin 73, and a coil spring 74 that constantly biases the pin 73 forward. The push-out pin 73 is the movable core 3 attached to the fifth plate.
0b is always in contact with the rear surface. In FIG. 7 (similar to the case of FIG. 4), the rear surface of the movable side core 30b is shown in the same plane as the rear surface of the fifth plate, and the coil spring 74
Is in a compressed state. The molded product eject rod 75 (FIGS. 4 and 6) of the molded product eject mechanism mounted on the movable platen 11 side is inserted into and removed from the rod through hole 70. In the molded product eject mechanism, only the molded product eject rod 75 is shown by a broken line.

The above is the configuration of the movable side mold 35b. In FIG. 6, reference numeral 76 is a coil spring for constantly biasing the return pin 64 forward so as to absorb the play of mounting the pin 64. Reference numeral 77 in FIG. 7 is a coil spring which constantly urges the No. 3 plate rearward with respect to the No. 2 plate.

The core 30 is composed of a fixed core 30a and a movable core 30b (FIG. 4). The number of this pair is prepared according to the type of molded product manufactured in the production plan, and the storage disk 27 in the core storage device 4 is prepared.
Of the bottomed circular holes 28. In addition, the core 30 itself is actually configured by assembling several blocks on both the fixed side and the movable side and assembling them with bolts.
Since the present invention is not particularly relevant, only the necessary parts will be described.

As a whole, the fixed side core 30a has a front-rear dimension and a mounting hole whose rear surface matches the rear surface of the fixed side mold 35a when it is mounted in the core mounting hole 40a of the fixed side mold 35a. It has an outer peripheral surface shape capable of slidingly moving 40a in the front-back direction. No. 3 bush 3 on the front side of the fixed core 30a
In the portion of 9 that abuts the rear surface of the flange 41,
A guide hole 78a into which the knock pin 42a enters is formed, and the locking groove 7 is formed on the outer peripheral surface of the core 30a.
9a and a handling groove 80a are formed.

The locking groove 79a is provided in the fixed core 30.
It is formed by cutting the circular outer peripheral surface of a in the tangential direction,
It is located above and below the outer peripheral surface corresponding to the tip of the lock pin 44a. The handling groove 80a is for fitting a projection provided on the core pinching claw 21 of the core replacing robot 3 and is an annular groove formed on the rear end side of the stationary core 30a. Other configurations of the fixed core 30a are not different from the conventional ones.

As a whole, the movable side core 30b has its front surface aligned with the front surface of the movable side mold 35b (the front surface of the No. 4 plate) when it is mounted in the core mounting hole 40b of the movable side mold 35b. In addition, the size of the No. 5 plate is substantially the same as the rear surface of the No. 5 plate, and the outer peripheral surface shape is slidable in the mounting hole 40b in the front-back direction. However, the outer peripheral surface has a larger diameter at the front portion than at the rear portion, and the stepped surface abuts on the front surface of the auxiliary bush 61 protruding toward the inner peripheral side of the core mounting hole 40b. A guide hole 78b into which the knock pin 42b enters is formed in the step surface portion.

A handling groove 80b and locking grooves 79b, 79c (FIG. 4) are formed on the outer peripheral surface of the movable core 30b. The handling groove 80b is formed in an annular shape like the handling groove 80a in the fixed core 30a, and the locking grooves 79b and 79c are tangentially cut like the lock groove 79a in the fixed core 30a. It is formed and is located at a position corresponding to the tip of the lock pin 44b. Lock groove 79b and lock groove 79c
Are separated from each other by a distance d _{2 in the} front-rear direction, and the mold 16
When is completely closed, the tip of the lock pin 44b can be inserted into the front lock groove 79b.

The rear portion of the movable core 30b has a hollow structure, and the eject pin drive mechanism 81 is provided in the space.
The mechanism 81 includes a drive plate 82, a push rod 83, a return spring 84 and an eject pin 85.
The return spring 84 is arranged between the drive plate 82 and the main body side of the movable core 30b. The eject pin 85 penetrates the movable core 30b and extends in the front-rear direction, and the rear end is fixed to the drive plate 82.

The drive plate 82 is inserted into the space so as to be movable back and forth, and is constantly biased rearward by a return spring 84.
The push rod 83 has a flange-shaped engagement bulge portion 86 at the rear end thereof, the front portion of the push rod 83 penetrates the rear portion of the movable core 30b slidably in the front-rear direction, and the front end thereof is fixed to the drive plate 82. ing. The return spring 84 is a coil spring and has an injection axis IL.
The push rods 83 are arranged symmetrically with respect to each other, and the push rods 83 are arranged vertically symmetrical with respect to the injection axis IL (FIG. 5).

The engaging bulging portion 86 of the push rod 83 is disengageably engaged with the dharma hole 66 (FIG. 5) of the lock plate 63. In FIG. 5, the push rod 83 is in the small diameter portion of the dharma hole and is in a state of being engaged with the lock plate 63. When the lock plate 63 is lifted from this state, the engagement bulging portion 86 of the push rod 83 reaches the position of the large diameter hole of the darma hole 66, and the push rod 83 and the lock plate 63 are disengaged. become.

The positioning jig 34 (FIG. 27) has the following structure. A substrate 87 fixed to the lower end of the piston 33
And a trapezoidal receiving portion 88 having a circular shape and arranged on the front surface thereof. The receiving portion 88 has a guide pin 89 in the front-rear direction at the center on the front surface side, and the guide pin 89 penetrates the substrate 87. The tip of the guide pin 89 is formed on the flange portion 90 to prevent it from coming off. A coil spring is interposed between the substrate 87 and the receiving portion 88, and always urges the receiving portion 88 rearward with respect to the substrate 87. The outer diameter of the receiving portion 88 is smaller than the inner diameter r ₁ (FIG. 9) of the flange 41 attached to the No. 3 bush 39.

The positioning jig 34 is the fixed core 3a of the core 30a.
When the number plate is moved rearward by the maximum distance by the air cylinder 54, that is, the primary engagement distance d ₄ , the number plate enters the gap formed between the number plate and the center reaches the position of the injection axis IL. Can be made When the receiving portion 88 is pushed forward, the guide pin 89 projects forward, and the flange portion 90 at the tip comes into contact with the rear end of the sprue bush 37.

The necessary parts of the structure of the injection molding apparatus 1 according to the embodiment have been described above.

According to the technical idea of the present invention, the mold 16 is provided with a fixed-side mother die 35a, a movable-side mother die 35b, and a fixed-side core 30a and a movable-side core 30b attached to these, and the fixed side. The core 35a is a mother plate body 91 (FIG. 27) composed of the first plate and the second plate, and an intermediate plate 92 composed of the third plate.
Will be equipped with. Therefore, the air cylinder 54 is an air cylinder for moving the intermediate plate. Hereafter, the mother body 9
1. The term "air cylinder 92 for moving the intermediate plate" is used.

The operated injection molding apparatus 1 operates as follows, and the method of the present invention is carried out. A mold 16 is attached to the mold clamping part of the injection molding machine 2, and a necessary program such as a core replacement time and a molding procedure based on the production plan, and a code for specifying each core 30 are provided in the NC device 7. , Core 30
It is assumed that the selection order, the molding data based on the characteristics of each core 30, and the like have been input. The core 30 is the fixed side core 30.
a is attached to the intermediate plate 92 of the fixed-side mother die 35a and fixed by the lock pin 44a, the movable-side core 30b is attached to the movable-side mother die 35b, and the lock pin 44b is in the front locking groove 79b. It is fixed by entering.

Below, only the operation of each part will be explained centering on the mold clamping unit 8 of the injection molding machine 2, and there will be no explanation regarding the exchange of signals and the processing of data inside the NC device 7 since there are no special features. Omit it. [Molding operation] The NC device 7 is controlled in the molding mode.
The air cylinder 54 for moving the intermediate plate is freed, the mold clamping servomotor 15 is driven in the forward direction, and the movable platen 11, that is, the movable mold 17b is pressed against the fixed mold 17a via the mold clamping mechanism 14. The mold clamping is completed (Fig. 4). The second plate and the third plate are guided by the fixed side guide 50, and the movable side guide 52 and the fixed side guide 50 determine the mutual positions of the fixed side mold 17a and the movable side mold 17b and combine them. There is.

By the operation of the injection unit 9, the cavity of the core 30 is filled with resin. After the pressure holding and cooling processes are completed, air is supplied to the intermediate plate moving air cylinder 54, the mold clamping servomotor 15 is driven in the opposite direction, and the movable platen 11 is moved backward. Fixed side mold 17a
The intermediate plate 92 is moved by being guided by the fixed side guide 50 while being in contact with the front surface of the movable side mold 17b.
At this time, the coil spring 77 (FIG. 7) interposed between the No. 2 plate and the intermediate plate 92 assists the initial movement of the No. 2 plate and the intermediate plate 92.

The rearward movement of the movable platen 11 continues, and when the movement of the intermediate plate 92 reaches the primary engagement distance d ₄ , the intermediate plate 92 is moved.
Comes into contact with an engagement bulge formed on the rear side of the third plate stopper pin 57 (FIG. 7), and thereafter moves further rearward by the secondary engagement distance d ₃ together with the second plate. Then, the rearward movement of the intermediate plate 92 is stopped by the engagement bulging portion of the second stopper pin 56 contacting the bottom portion of the engagement hole 58 (see FIG. 16).

As a result, a gap into which the positioning jig 34 enters is formed between the intermediate plate 92 and the rear surface of the main mold body 91 of the fixed-side master mold 35a (the rear surface of the second plate). Further, the sprue resin is cut from the sprue bush by separating the No. 2 plate from the No. 1 plate in the master mold body 91, and the runner resin formed between the No. 2 plate and the intermediate plate 92 is separated and dropped. To do.

The movable platen 11 reaches the mold opening end position and stops. The molded product eject mechanism is operated and the molded product eject rod 75 is advanced. This rod 75
Of the guide pin 6 penetrates the rod through hole 70 of the No. 9 plate and contacts the rear surface of the No. 8 plate.
Use 5 as a guide and move it forward. Then, the push rod 83 engaged with the dharma hole 66 of the lock plate 63 moves forward, and the eject pin drive mechanism 81 is operated.

That is, the drive plate 82 inside the movable core 30a is pushed forward by the push rod 83 against the return spring 84, the eject pin 85 is projected forward, and the molded product is moved forward from the movable cavity. To be removed. At this time, since the lock pin 44b has entered the locking groove 79b, the movable side core 30b does not move even if the push rod 83 is pushed forward.

The air cylinder 32 is driven and the piston 3
The positioning jig 34 reciprocates up and down once through the gap between the No. 2 plate and the intermediate plate 92 by way of 3. As a result, the runner resin that may be caught and left in the gap is knocked off. Further, the molded product is taken out from the mold clamping portion by a product taking-out device (not shown).

In this case, the intermediate plate 92 and the movable side mold 35b
Since there is no connecting bar or the like for separating the intermediate plate 92 from the matrix main body 91 between the two, the operable range of the product take-out device is wide.

The molded product eject rod 75 is moved backward and returned to its original position. The drive plate 82 is moved backward by being pushed by the return spring 84, and the eject pin 85 is returned to the original position. When the drive plate 82 is retracted, the 7th plate and the 8th plate are also moved rearward via the push rods 83 and returned to their original positions. This return operation is performed by the coil spring 68 (FIG. 6) interposed between the No. 4 plate and the No. 7 plate.
Assisted by.

Further, this return operation is performed by the return pin 64.
Secured by. That is, when the return of the No. 7 plate and the No. 8 plate is incomplete, the tip of the return pin 64 projects from the front surface of the movable-side mold 17b (the front surface of the No. 4 plate), and returns at the next mold clamping. The pin 64 abuts against the return pin receiver 69 of the third plate and is pushed back. As a result, the incomplete return of the No. 7 plate and the No. 8 plate is corrected prior to the complete mold clamping.

During this time, the temperature adjusting device 6 circulates the temperature adjusting liquid through the hose 49 to the temperature adjusting liquid flow path formed by the plate temperature adjusting holes 47a, 47b and the like. The temperature and flow rate of the temperature control liquid are adjusted based on signals or data sent to the NC device 7 from various parts of the mold 16 or various sensors arranged in the temperature control device 6. Further, in the third plate and the fourth plate, the temperature control liquid flow path is the core 3
It surrounds 0, and the temperature of the core 30 is adjusted evenly and accurately.

Then, the mold clamping operation is performed again, and when the injection unit 9 is ready, the resin is injected and filled. [Core Replacement Operation] When the NC device 7 determines that a predetermined number of molded products have been obtained by counting the molding cycle, the control of the NC device 7 becomes the core replacement mode. When it is confirmed by signals from these devices that the operating parts of the jig device 5 and the molded product take-out device are completely retracted from the mold clamping part, the mold clamping servomotor 15 is driven in the forward direction, The mold 16 is clamped by the mold clamping operation, and is once completely closed.

Next, air is supplied in the forward direction to the air cylinder 54 for the intermediate plate, and the servomotor 15 for clamping the mold.
Are driven in the opposite direction, and the movable platen 11 is moved backward. As a result, the intermediate plate 92 is opened in the same manner as when opening the mold.
Moves rearward together with the movable side mold 17b in a state of being in contact with the front surface of the movable side mold 17b. Similar to the above, the intermediate plate 9
The backward movement of 2 is guided by the fixed-side guide 50 and reaches the primary engagement distance d ₄ by the No. 3 plate stopper pin 57 (FIG. 7) and then moves backward by the secondary engagement distance d ₃ .

The intermediate plate 92 has a primary and secondary distance (d ₄ + d
_{When (3} ) is moved, the engagement bulging portion at the front portion of the No. 2 plate stopper pin 56 comes into contact with the bottom portion of the engagement hole 58, and further rearward movement is blocked.

The movable platen 11 is further moved rearward and stopped when a gap of distance d ₁ is formed with the rear surface of the intermediate plate 92 stopped as described above. Movable mold 17b
(FIG. 4), air is supplied to the air cylinder 46b, and the lock pin 44b is removed from the locking groove 79b of the movable core 30b. Air is supplied to the air cylinder 46c, and the lock plate 63 is moved upward. The engagement bulge portion 86 of the push rod 83 has the lock plate 6
3 moves from the small diameter portion to the large diameter portion of the Dharma hole 66, and the lock of the lock plate 63 by the push rod 83 is released. As a result, the movable core 30b is in a state where it can freely slide forward.

Then, the coil spring 74 of the core push-out mechanism 71 (FIG. 7) springs to push the push-out pin 74 forward from the case 72. Since the tip of the push-out pin 74 is in contact with the rear surface of the movable core 30a, the movable core 30b thereby projects forward and abuts against the rear surface of the fixed core 30a and stops. That is, the movable die 30b is projected forward by a predetermined distance (d ₁ ) with respect to the movable mother die 35b (FIG. 17). At this time, the rear locking groove 79c of the movable core 30b faces the tip of the lock pin 44b.

The lock plate 63 having the dharma hole 66 formed therein, the air cylinder 46c and the push rod 83 constitute a core lock mechanism, and the core push-out mechanism 71 and the air cylinder 46c provided with a coil spring 74 are provided therein. The core pushing-out means is configured by combining the NC device 7 for giving an operation command to the core. The air in the air cylinder 46b is wiped out, and the lock pin 44b is pushed out by the spring provided inside the cylinder, so that the lock groove 79c is released.
To re-lock the movable core 30b (see FIG. 1).
8).

At the same time, the jig device 5 is driven to move the positioning jig 34 to the main mold body 91 of the fixed-side master mold 35a and the intermediate plate 9.
Then, the center of the receiving portion 88 is made to coincide with the position of the emission axis line IL and stopped (FIG. 27).

The air in the air cylinder 54 for moving the intermediate plate is released, and the servomotor 15 for clamping the mold is driven in the forward direction to move the movable side mold 17b forward. Then, the fixed mold 30a, the positioning jig 34 and the second plate are pushed forward, and the fixed core 30a and the positioning jig 34 are pushed.
Between the positioning jig 34 and the second plate and between the second plate and the first plate.
The gap between the rear surface of the plate and the back plate is completely erased (Fig. 19,
20 and 28).

As a result, the parting line of the core 30
The CPL is positioned at a predetermined distance from the die mounting surface of the fixed platen 10. As for the position in the rotation direction, the fixed side and movable side knock pins 42a and 42b are respectively provided with guide holes 78a and 78 of the fixed side core 30a and the fixed side core 30b.
Positioning is carried out by fitting into b.

The contact between the positioning jig 34 and the second plate is such that the receiving portion 88 of the positioning jig 34 is pushed forward, the guide pin 89 projects forward from the substrate 87, and the flange portion 90 at the tip of the guide pin 89 projects. The structure comes into contact with the rear end of the sprue bush 37 (FIG. 27). Further, the forward rotation of the mold clamping servomotor 15 is stopped by detecting an increase in the torque current due to an increase in the addition due to the clearance. Core 30 of all lock pins 44a, 44b and lock plate 63 in fixed-side mold 17a and movable-side mold 17b.
The locked state for is released (FIG. 21).

Air is supplied to the intermediate plate moving air cylinder 54 in the opposite direction, and the intermediate plate 92 is moved forward by a distance d ₁ . That is, the fixed core 30 that stops at that position
a is exposed to the rear side from the rear surface of the intermediate plate 92 by the dimension d ₁ (FIGS. 22 and 29). That is, the fixed core 30a is pushed out from the intermediate plate 92 by the dimension d ₁ .

As a result, a gap of size d ₁ + d ₂ is formed between the rear surface of the fixed-side mold 35a and the front surface of the movable-side mold 35b. Then, the core parting line CPL, the handling groove 80a (FIG. 1) in the fixed side core 30a, and the handling groove 80b in the movable side core 30b are exposed at the center of this gap. Further, this gap is a hand insertion gap into which the core pinching claw 21 of the core exchanging robot 3 enters.

As described above, the intermediate plate 92, the air cylinder 54 for moving the intermediate plate, the positioning jig 34, and the NC device 7 for giving an operation command to the cylinder 54 constitute core pushing-out means.

The above-mentioned core pushing-out means and core pushing-out means constitute a parting line drawing means, by which the parting line of the core 30 is drawn out to the area of the hand insertion gap. .. When it is confirmed that the moving body 20 of the core exchanging robot 3 is in the set core exchanging position on the rail 19 and that the sandwiching surface of the core sandwiching claw 21 is vertical, the air of the robot 3 is removed. Air is supplied to the cylinder 23 and driven in the forward direction. As a result, the core pinching claw 21 enters the hand inserting gap from the home position set outside the region of the mold clamping part, and pinches the core 30 (FIG. 23).

Two protrusions are arranged on the inner surface side of the core pinching claw 21 with a space in front and back. The protrusions are engaged with the handling grooves 80a and 80b, respectively, and the core 30 is retained. Hold it. That is, the core clamping claw 21 clamps the fixed core part and the movable core part on both sides of the core parting line CPL at once. In this case, the core parting line CPL is exposed in the hand insertion gap,
By the core pinching claw 21, the fixed core part and the movable core part are easily clamped at the same time.

Upon receipt of the pinching completion signal from the core changing robot 3, the NC device 7 drives the mold clamping servomotor 15 in the reverse direction to retract the movable platen 11 to the mold opening position (FIG. 24). As a result, the movable side core 30b is left on the side of the fixed side mold 17a, and is removed from the movable side mold 35b (FIG. 24). The claw front-back movement motor 22 of the core changing robot 3 is driven in the forward direction, the core 30 is pulled out rearward (FIG. 25), and taken out from the mold clamping part.

Next, air is supplied to the air cylinder 23 and driven in the opposite direction, the core 30 is lifted up, and the core 30 is extracted outside the region of the mold clamping portion. Then, the holding surface rotating motor 25 is driven in the forward direction to orient the core 30 in the vertical direction.

The pawl front-rear moving motor 22 is further driven in the forward direction so that the core 30 is left as it is in the rear core storage device 4.
Move up. The air cylinder 23 is driven in the forward direction,
The core 30 is stored in the empty bottomed circular hole 28 in the storage disk 27 of the core storage device 4. The core pinching claw 21 is a core 30
Then, the air cylinder 23 is driven in the opposite direction to move directly above the stored core 30 and is stopped in the standby state (FIG. 2, broken line position).

Air is supplied to the intermediate plate moving air cylinder 54 and driven in the forward direction to move the intermediate plate 92 through the distance d.
₁ + d ₂ is moved backward, and the mother die body 91 and the intermediate plate 9 are moved.
The interval of 2 is widened to the interval when the positioning jig 34 enters.

Air is supplied to the air cylinder 32 of the jig device 5 and driven in the opposite direction to retract the positioning jig 34 upward and return it to the home position outside the area of the mold clamping portion. As a result, the operation of taking out the core 30 is completed.

Subsequently, a new core 30 is mounted on the mold clamping unit 8 in the next operation. When it is confirmed that the movable platen 11 is in the mold opening position, air is supplied to the intermediate plate moving air cylinder 54 and is driven in the opposite direction. As a result, the intermediate plate 92 is attracted to the mother die body 91 (FIG. 10). The NC device 7 reads the code of the core 30 to be mounted next from the memory, drives the storage disk 27 by the disk motor 29, and waits for the core 30 corresponding to the code. Position it just below.

The core exchanging robot 3 is driven in the same manner as described above, but with the order and direction of the dismounting operations reversed, and the core 30 is arranged between the fixed side mold 35a and the movable side mold 35b. .. The central axis of the core 30 coincides with the injection axis IL. The core changing robot 3 moves the core 30 forward to insert the front portion of the fixed core 30a into the core mounting hole 40a of the fixed mold 35a. The storage disk 27 stops at that position when a new core is taken out, and an empty bottomed circular hole 28 for the core 30 attached this time is prepared.

The mold clamping servomotor 15 is driven in the forward direction, the movable side mold 35b is advanced, the rear part of the movable side core 30b is inserted into the core mounting hole 40b, and the fixed side mold 35a is moved. It stops when the distance from the rear surface reaches the distance d ₁ + d ₂ (FIG. 13).

The core pinching claw 21 of the core exchanging robot 3 releases the core 30 and is pulled out from the gap to return to the home position (FIG. 14). The mold clamping servomotor 15 is further driven in the positive direction, and the movable platen 11 is advanced to the mold clamping position. The air in the air cylinders 46a and 46b is released, and the lock pins 44a, 4
4b respectively enter into the locking groove 79a of the fixed core 30a and the locking groove 79b of the movable core 30b, and the core 3
0 is fixed to each of the matrixes 35a and 35b. Also,
The coil spring 74 of the core pushing mechanism 71 is compressed.

At the same time, air is supplied to the air cylinder 46c, the lock plate 63 is driven in the opposite direction, and the lock plate 63 is provided at the rear end of the push rod 83 which has entered the position of the large diameter hole of the Darma hole 66. Engagement bulge 86
Are engaged at the small-diameter holes (FIGS. 15 and 4). As described above, the mounting of the core 30 is completed. Then, the core replacement operation that has executed the method of the present invention ends.

30 to 35 show the second embodiment,
The structure of the core pushing mechanism 71 and the lock plate 63 is different from that of the first embodiment. The core pushing-out mechanism 71 (FIG. 35) in the second embodiment is composed of a push-out pin 93 and a returning coil spring 94. The protruding pin 93 is fitted into the hole of the lock plate 63 so as to be movable only in the front-rear direction, and the elongated hole 95 provided in the No. 8 plate (see FIG. 3).
It penetrates 3). The tip end of the protrusion pin 93 faces the space 62 formed by the No. 6 plate, and the rear end thereof is arranged in the rod through hole 70 formed in the No. 9 plate. This pin 9
In No. 3, the tip end portion of the No. 7 plate is prevented from coming out backward, and the coil spring 94 is mounted between the bulging portion at the rear end and the No. 7 plate. This spring 94
Always pushes the protruding pin 93 backward.

Therefore, when the push-out pin 93 is pushed forward, the tip thereof comes into contact with the rear surface of the movable core 30b. Also, the diameter of the protrusion pin 93 is sufficiently smaller than the diameter of the rod through hole 70, and the lock plate 63
It is possible to move up and down in the hole 70 according to the up and down movement of the.

The cross-sectional shapes of the protruding pin 93, the elongated hole 95 and the molded product eject pin 75 (rod through hole 70) are schematically shown in FIG. That is, the vertical dimension of the long hole 95 is 2 times larger than the diameter of the protruding pin 93.
The diameter of the molded product eject rod 75 is sufficiently larger than the lateral (left and right) dimension of the elongated hole 95, and is about 3/4 of the vertical dimension of the elongated hole 95.

On the other hand, in the case of the second embodiment, the tip end portion of the molded product eject rod 75 is notched by the protrusion amount of the protrusion pin 93 protruding in the rod through hole 70 in the No. 9 plate as shown in FIG. Is the excision part 96.

In the lock plate 63 of the second embodiment, the duller holes 66 are arranged on the left and right (FIG. 34), and the protrusion pin 93 penetrates the intermediate portion above them. Therefore, the push rods 83 projecting rearward from the rear surface of the movable side core 30b are arranged on the left and right, and the elongated holes 95 are located above the left and right daruma holes 66 as a position in front view, and the eject pin drive is performed. The return spring 84 of the mechanism 81 is arranged vertically. Other configurations are the same as those in the first embodiment.

The core pushing out mechanism 71 of the second embodiment operates as follows. In the state where the core 30 is mounted on the mother die 35 and the injection molding operation is being performed (FIG. 35), the lock plate 63 is pulled up and the ejection pin 93 is moved up. This is the rod through hole 70 of plate 9.
As for the ejector pin 93,
It is located at the upper part of (Fig. 35, Fig. 32). Further, the rear end of the push rod 83 is engaged with the dharma hole 66.

In the molding operation, when the injection, pressure-holding and cooling steps are completed, the molded product ejecting process starts and the molded product eject rod 75 is ejected forward.

The tip of the molded product eject rod 75 hits the rear surface of the No. 8 plate, pushes the No. 8 plate forward, and push rod 83, drive plate 82, as in the case of the first embodiment.
The molded product is moved to the movable mold 17 via the eject pin 85.
Push it down from the cavity of b. At this time, the rear end portion of the protruding pin 93 projects into the rod through hole 70, but this portion does not fit into the cutout portion 96 of the molded product eject pin 75 and is not pushed. Therefore, the core 30 is not subjected to the pushing action during the injection molding operation.

In the core replacement operation, the rear surface of the intermediate plate 92 and the
A gap d ₁ is formed between the front side of the number plate and the movable side mold 35.
When the lock pin 44b that has fixed the movable die 30b in b is released (FIGS. 16 and 17), the lock plate 63 descends to push the protrusion pin 93 into the rod through hole 7.
It is placed at the bottom of 0 (FIG. 30). At the same time, the engaging bulging portion 86 of the push rod 83 is arranged in the large diameter portion of the dharma hole 66 to release it.

Next, the molded product eject rod 75 is projected forward. At this time, the rear end of the protrusion pin 93 is in a position where it abuts against the tip of the molded product eject pin 75. As a result, the ejecting pin 93 is first pushed forward so that the tip portion projects into the space 62, and then the tip comes into contact with the rear surface of the No. 8 plate. When the molded product eject rod 75 is further projected, the projecting pin 93 pushes the No. 7 plate and No. 8 plate forward while keeping contact with the rear surface of the movable core 30b. The subsequent core removing operation is the same as in the first embodiment.

When the movable core 30b is mounted, the protruding pin 93 is located below the rod through hole 70, but since it is returned to the rear by the coil spring 94, the tip end is retracted from the space 62. When the movable core 30b is mounted, it does not get in the way. The core mounting operation other than this is the same as that of the first embodiment. That is, the core pushing-out mechanism 71 in the core pushing-out means of the second embodiment is a mechanism characterized by being driven by the molded product ejecting mechanism.

In the case of the second embodiment, since the core pushing mechanism 71 is strongly driven by the molded product eject rod 75, the movable core 30b can be surely pushed.
The core pushing-out means includes a spring 74 which is maintained in a compressed state with the movable-side mold 35b when the movable-side mold 30b according to the first embodiment is mounted on the movable-side mold 35b. It is also possible to provide both a mechanism similar to the provided core pushing mechanism 71 and a core pushing mechanism 71 driven by the molded product eject pin 75 of the second embodiment.

In this case, the core pushing-out mechanism by the molded product eject rod 75 has the movable core 3 which is tightly fitted.
It is only necessary to give 0b an initial operation, and there is an advantage that a large stroke and a strong stroke are not required. That is, the core pushing-out means is provided with an pushing-out mechanism driven by the molded article ejecting mechanism, so that the movable-side core 3
It can be used as an initial actuation means of 0b to ensure the actuation.

The embodiment shown in the drawings has been described above.
It can also be configured as follows.

When the core exchanging robot 3 is provided with its own NC device and the program of this NC device has an operating procedure and judgment at the time of exchanging the core, when the conditions are satisfied from the NC device 7 of the injection molding machine 2. Alternatively, a collaborative system that simply issues an operation start permission command may be used.

In the first and second embodiments, the second plate and the third plate on the fixed side are movable with respect to the first plate to have a structure similar to that of a three-plate mold, but the present invention is limited to the third plate. It is also possible to implement a structure similar to a two-plate mold in which is movable.

As a sensor for detecting the temperature of the core 30, a thermocouple is inserted into the tips of the lock pins 44a and 44b, and the lead wire is taken out through the inside of these pins 44a and 44b, and the NC device 7 or the temperature control unit is operated. When connected to the device 6, a more accurate core temperature can be detected.

[0106]

As described above, the core can be easily replaced with respect to the mother die attached to the mold clamping portion of the injection molding machine by using the core exchanging robot. It is possible to continuously and automatically operate the core changing robot and the injection molding device using the core changing mold.

[Brief description of drawings]

FIG. 1 is a plan view mechanically showing.

FIG. 2 is a side view taken along the line AA of FIG.

FIG. 3 is a simplified front view, partly in section.

FIG. 4 is a simplified vertical cross-sectional view of a mold, only a part of which is hatched.

FIG. 5 is a side view of a third plate side along a parting line PL.

FIG. 6 is a simplified cross-sectional view of a mold, only a part of which is hatched.

FIG. 7 is a schematic vertical sectional view of a mold.

FIG. 8 is a simplified side view of the first plate.

FIG. 9 is a side view showing the third plate in a simplified manner.

FIG. 10 is a mechanical front view (at the time of mounting) for explaining an operating state.

FIG. 11 is a mechanical front view for explaining an operating state.

FIG. 12 is a mechanical front view for explaining an operating state.

FIG. 13 is a mechanical front view for explaining an operating state.

FIG. 14 is a mechanical front view for explaining an operating state.

FIG. 15 is a mechanical front view for explaining an operating state.

FIG. 16 is a mechanical front view (at the time of removal) for explaining an operating state.

FIG. 17 is a mechanical front view for explaining an operating state.

FIG. 18 is a mechanical front view for explaining an operating state.

FIG. 19 is a mechanical front view for explaining an operating state.

FIG. 20 is a mechanical front view for explaining an operating state.

FIG. 21 is a mechanical front view for explaining an operating state.

FIG. 22 is a mechanical front view for explaining an operating state.

FIG. 23 is a mechanical front view for explaining an operating state.

FIG. 24 is a mechanical front view for explaining an operating state.

FIG. 25 is a mechanical front view for explaining an operating state.

FIG. 26 is a mechanical front view for explaining an operating state.

FIG. 27 is a mechanical front view (jig device) for explaining an operating state.

FIG. 28 is a mechanical front view for explaining an operating state.

FIG. 29 is a mechanical front view for explaining an operating state.

FIG. 30 is a partially enlarged front view for explaining the operating state (second embodiment).

FIG. 31 is a partially enlarged front view for explaining an operating state.

FIG. 32 is a partially enlarged front view for explaining an operating state.

FIG. 33 is a side view showing the dimensional relationship.

FIG. 34 is a side view of the third plate side along the parting line PL (second embodiment).

FIG. 35 is a schematic vertical sectional view of a movable side die, only a part of which is hatched.

[Explanation of symbols]

2 injection molding machine 3 core exchange robot 5 jig device 7 NC device 17a fixed side mold 17b movable side mold 30a fixed side core 30b movable side core 34 positioning jig 35a fixed side mold 35b movable side mold 71 Core Extrusion Mechanism 75 Molded Article Eject Mechanism 81 Eject Pin Drive Mechanism 91 Master Mold Body 92 Intermediate Plate (3
Plate ₁ ) Extrusion amount d ₂ Extrusion amount PL Parting line CPL Core parting line IL Injection axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Ito 3580 Koshinoba, Oshinomura, Minamitsuru-gun, Yamanashi Prefecture FANUC Co., Ltd. Local FANUC Co., Ltd. (72) Inventor Kikuo Watanabe 3580 Koshinoba, Oshinomura, Minamitsuru-gun, Yamanashi Pref. (72) Inventor Toshio Matsukura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Kaoru Maeda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Incorporated (72) Inventor Hiroshi Yonekubo 2-34-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optics (72) Inventor Kenji Haga 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Issei Tokuda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd.

Claims (9)

[Claims] 1. A core replacement method for a mold, characterized in that the following steps are taken when a core is taken out in a core replacement type molding apparatus; a movable core is separated from a movable mold by a predetermined distance ( d ₁ ) projecting forward, while maintaining this state, the movable side core presses the fixed side core forward, so that the parting line of the core is moved to a predetermined position from the die mounting surface of the fixed platen. Position and move the fixed-side mold forward with respect to the fixed-side core by a predetermined distance (d ₂ ) so that the hand of the core-changing robot is inserted between the rear surface of the fixed-side mold and the front surface of the movable-side mold. While forming a gap, position the core parting line in the gap, and sandwich the movable core part and the fixed core part on both sides of the core parting line with the robot hand all at once, Move the mold back and move the core After removing from the mold, taking out the nipped core from the mold clamping unit of the molding apparatus by the operation of the core replacement robot. 2. The core replacing method according to claim 1, wherein the fixed core is fitted and locked on an intermediate plate provided on the fixed mold and the front-rear position of which is adjustable. The method of replacing the core of the mold is characterized by taking the following steps; the movable mold is retracted with respect to the fixed mold to form a predetermined distance (d ₁ ) and The movable core is projected forward by a predetermined distance (d ₁ ) with respect to the mother die by protruding, and the intermediate plate and the fixed core are unlocked to move the intermediate plate forward by a predetermined distance (d ₁ ). ₂ ) get 3. The core replacement method according to claim 2, wherein the mold core replacement method is characterized by the following steps; when the movable core presses the fixed core. , A positioning jig is arranged between the main body of the fixed-side master die and the intermediate plate. 4. A molding machine, a core exchange robot, a mold including a combination of a mother die and a core, a core pushing-out means for projecting the movable core forward with respect to the movable mother die, and a fixed core. On the other hand, a molding device provided with a core pushing-out means for moving the rear surface of the fixed-side mother die forward, when removing the core,
The parting line of the core is located at a predetermined distance from the mold mounting surface of the fixed platen, and a hand insertion gap of the core changing robot is formed between the rear surface of the fixed side mold and the front surface of the movable side mold. A molding apparatus using a core-exchangeable mold, comprising a parting line drawing-out means for arranging the parting line in the gap. 5. The core pushing-out means compresses between a core locking mechanism arranged between the movable core and the movable mother die and the mother die when the core is mounted on the mother die. The core-replaceable mold according to claim 4, wherein the movable core is maintained at a mounting position by a core locking mechanism, the spring being maintained in a closed state. Molding equipment. 6. The molding apparatus using a core-replaceable mold according to claim 4, wherein the core pushing-out means is a pushing mechanism driven by a molded article ejecting mechanism. 7. A molding apparatus using a core-replaceable mold according to claim 5, wherein the core pushing-out means comprises a pushing mechanism driven by a molded article ejecting mechanism. 8. The fixed-side mother die is composed of a mother die main body and an intermediate plate whose front and rear positions can be adjusted, and the core push-out means moves the intermediate plate forward so that the fixed-side core becomes On the other hand, the molding apparatus using the core-replaceable mold according to any one of claims 4 to 7, wherein the rear surface of the fixed-side mother die is moved forward. 9. The parting line drawing means includes a positioning jig for inserting and withdrawing into a gap between the mother die main body and the intermediate plate, and when the parting line of the core is positioned at a predetermined distance from the die mounting surface of the fixed platen, 9. The core replacement according to claim 8, wherein a positioning jig is interposed in a gap between the mother die main body and the intermediate plate, and the stationary core is pressed against the mother die body by the movable core together with the jig. Molding equipment using a metal mold.