JPH0630419Y2 - Insert landing detector for injection mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an apparatus for detecting in an injection molding die that a molded article molding insert to be replaced has landed on an insert receiving member.

[Conventional technology]

In the conventional mold for injection molding, it is sufficient not to replace the entire mold at the time of mold replacement, but to replace only a part of the mold, which simplifies the replacement work and reduces the mold cost. The mold stock space is being reduced.

[Problems to be solved by the device]

As described above, when only a part of the parts, specifically, for example, the molded product molding insert is replaced, that the replaced insert has landed on the insert receiving member, that is, the insert is mounted on the mold body. It is necessary to perform the injection molding work after confirming that.

Further, for example, since the temperature of the insert during molding must be a predetermined temperature, the insert may be provided with a flow groove for circulating the temperature control fluid, and this flow groove is formed on the end surface of the insert that abuts the insert receiving member. Sometimes. In this way, when the temperature control fluid circulation groove is formed on the end surface of the insert that abuts the insert receiving member, the temperature control fluid is given a pressure to flow therethrough, so that the pressure does not separate the insert from the insert receiving member. Is required.

In this way, when starting the injection molding work, it is not only necessary to confirm that the insert has landed on the insert receiving member, but also to prevent the insert from landing on the insert receiving member by the pressure of the temperature control fluid. Confused,
Therefore, it must be confirmed that the insert is not separated from the insert receiving member when the temperature control fluid is circulated in the circulation groove.

The object of the present invention is to make it possible to start the injection molding work after confirming both the landing of the insert on the insert receiving member and the fact that this landing is performed with a large force. The present invention provides an insert landing detection device.

[Means for Solving the Problems]

For this reason, the insert landing detection device for an injection molding die according to the present invention has an internal cavity and is separable into at least two, and the injection molding is configured to include at least one insert. In the mold for use, a temperature control fluid circulation groove is formed on the end surface of the insert, and the end surface is brought into contact with the insert receiving member by the hydraulic pressure of a hydraulic cylinder to allow the insert to freely land on the insert receiving member. The landing of the insert is detected by the insert landing detecting means, the oil pressure of the hydraulic cylinder is detected by the oil pressure detecting means, and the injection molding machine is driven by the detection signals from the insert landing detecting means and the oil pressure detecting means. It is characterized in that the interlock of the controlling controller is released.

[Action]

When the insert is landed on the insert receiving member, it is detected by the insert landing detection means, and whether the end surface of the insert is in contact with the insert receiving member with a large force so as not to be separated by the pressure of the temperature control fluid, in other words, Whether or not the insert is landing on the insert receiving member with a large force is detected by the hydraulic pressure detecting means for detecting the hydraulic pressure of the hydraulic cylinder, the insert is landing on the insert receiving member, and this landing is performed with a large force. During the operation, the interlock of the controller is released by the signals from the both detecting means, and the injection molding operation by the injection molding machine can be performed.

〔Example〕

The drawings show an injection molding die to which the apparatus according to the embodiment of the present invention is applied. The injection molding die is a lens made of a thermoplastic resin such as PMMA (polymethylmethacrylate) or PC (polycarbonate) as a molten resin. Can be molded. The term "die" as used herein includes not only metal but also all types made of other materials such as glass and ceramics.

In addition, the injection molding die according to the present embodiment, as shown in FIG.
This is for taking two lenses in which two cavities 3 are formed between the upper mold 1 and the lower mold 2. The upper mold 1 and the lower mold 2 are separated from each other on a horizontal parting line PL. The mold body 4 of the upper mold 1 comprises an insert guide member 5, a mold plate 6 and a mold plate 7, and the mold body 8 of the lower mold 2 comprises an insert guide member 9 and a mold plate 10. The inserts 11 and 12 of the upper mold 1 and the lower mold 2 are slidably arranged in the insert fitting portions 13 and 14 inside the vertically-arranged cylindrical insert guide members 5 and 9, respectively. 12 is movable in a direction perpendicular to the parting line PL.

The lower mold 2 is a fixed mold, and the mold body 8 of the lower mold 2 is fixed to the mold mounting member 15. Mold body 4 of upper mold 1 that is movable
Is a mold mounting member 16 including an upper member 16A and a lower member 16B.
2, a disc spring 17A arranged on the outer circumference of the bolt 17 is interposed between the die body 4 and the die mounting member 16. Since the mold clamping device for the injection molding mold according to the present embodiment is a direct pressure type, the mold mounting member 1
A downward mold clamping force (not shown) directly acts on the mold clamping cylinder 6. Further, since the injection molding die according to the present embodiment is for injection compression molding, the mold body 4 and the mold mounting member 16 of the upper mold 1 as shown in FIG.
A gap S is provided between the mold body 4 and the mold mounting member 16 of the upper mold 1, and the mold body 4 and the mold mounting member 16 are opened and closed by the gap S while being guided by the guide pins 18. Therefore, the injection molding die is divided into a total of three dies. A cylinder (not shown) is arranged below the die mounting member 15 of the die body 8 of the lower die 2, and the die mounting member 16 is pushed up by the cylinder against the die clamping force of the die clamping cylinder, whereby the gap S is formed. To be formed.

As shown in FIG. 1, a hydraulic cylinder 19 is provided downward on the die mounting member 16, and a piston rod 21 of a piston 20 of the cylinder 19 penetrates a pack insert 22 fixedly mounted on the lower surface of the cylinder 19 and is provided at the lower end thereof. The T-shaped clamp member 23 is attached. This T-shaped clamp member 23
Is engageable with a T-shaped groove 24 formed in the insert 11. As shown in FIG. 4, one end of the T-shaped groove 24 is an open end 24A that opens to the outer peripheral surface of the insert 11, and the T-shaped clamp member 2 extends from the open end 24A.
3 can be engaged in the T-shaped groove 24. After this engagement is performed, oil is supplied to and discharged from the hydraulic cylinder 19 and the piston rod 21 is moved up and down to insert the insert 11 into the mold body 4 when the upper mold 1 and the lower mold 2 are divided. The insert 11 can be inserted into and removed from the portion 13, and the upper end surface of the insert 11 in which the T-shaped groove 24 is formed comes into contact with the lower surface of the back insert 22, so that the insert 11 is in a clamped state.

As described above, the hydraulic cylinder 19, the piston rod 21 of the piston 20, the back insert 22, the T-shaped clamp member 23, and the T-shaped groove 24 constitute the upper mold insert clamping means 25 for clamping the insert 11. The hydraulic cylinder 19 and the piston rod 21 of the piston 20 constitute upper die insert moving means 25A for moving the insert 11 in the direction perpendicular to the parting line PL and inserting and removing it in the insert fitting portion 13. The back insert 22 serves as an insert receiving member because the upper end surface of the insert 11 comes into contact with the back insert 22 to receive the insert 11.

The insert 12 of the lower mold 2 is also provided with a structure similar to the above, and a hydraulic cylinder 26 is fixed upward to the mold mounting member 15, and the piston rod 28 of the piston 27 of this cylinder 26 is fixed to the mold mounting member 15. And a T-shaped clamp member 29 is attached to the upper end thereof, and the T-shaped clamp member 29 engages with a T-shaped groove 30 formed in the lower end surface of the insert 12. These hydraulic cylinder 26, piston rod 28 of piston 27, T-shaped clamp member 29,
The T-shaped groove 30 and the die mounting member 15 constitute a lower die insert clamp means 31, of which the hydraulic cylinder 2
6. The piston rod 28 of the piston 27 constitutes the lower die insert moving means 31A for moving the insert 12 in the direction perpendicular to the parting line PL and inserting / removing it in / from the insert fitting portion 14, and the die mounting member 15 is the insert 12. Is a receiving member for receiving the insert 12 by abutting the lower end surface thereof.

As described above, the hydraulic cylinder 19 is provided with a necessary seal structure for preventing the oil in the cylinder 19 from leaking and reaching the insert 11, and the upper and lower thickness dimensions of the inserts 11 and 12 are as follows. Insert 1 due to T-shaped grooves 24 and 30 even if the temperature is raised to a predetermined temperature
It is set so that asymmetric thermal strain does not occur in 1 and 12.

The hydraulic cylinder 19 is vertically slidably arranged on the die mounting member 16, and an ejecting pressure receiving member 32 is fixedly mounted on the upper end of the hydraulic cylinder 19 and is not shown from a hole 33 formed in the die mounting member 16. When the eject rod is inserted and the pressure receiving member 32 is pushed down, the hydraulic cylinder 19, the back insert 22, and the insert 11 are also pushed down, and the lens molded in the cavity 3 is projected when the upper mold 1 and the lower mold 2 are divided. It is supposed to be done.

Therefore, the eject rod, the pressure receiving member 32, the hydraulic cylinder 19, the back insert 22, the insert 11, and the piston rod 21 of the piston 20 for fixing the insert 11 to the back insert 22, the T-shaped clamp member 23, the T-shaped groove 24. The eject means 34 is constituted by the hydraulic cylinder 19, the back insert 22, the piston rod 21 of the piston 20, and the T-shaped clamp member 2.
3, T-shaped groove 24 is the upper mold insert clamp means 25
It is a component of the eject means 3 and
The piston rod 21 is incorporated in the inner center of both means 25, 34.

As shown in FIG. 1, an eject pin 35 is vertically slidably arranged also in a central portion of the injection molding die, and a pressure receiving member 36 fixed to an upper end of the eject pin 35 is a die mounting member 16.
The eject pin 35 is pushed down by being pushed down by the eject rod inserted from the hole 37.

As shown in FIGS. 2 and 3, the spring force of the springs 40 and 41 wound around the outer circumference of the eject return pins 38 and 39 acts on the pressure receiving members 32 and 36, so that the pressure receiving members rise if the eject rod rises. 32, 36, etc. have also risen and are returning to the old position.

As shown in FIG. 1, a cylindrical case 60 is fixedly mounted on the upper mold 1, and a detection rod 61 inserted in the case 60 is slidable in the horizontal direction while being guided by a guide member 62. The tip of the detection rod 61, which is constantly urged toward the insert 11, penetrates the insert guide member 5 and contacts the guide inclined surface 64 of the insert 11. The forward movement of the detection rod 61 when the insert 11 descends away from the back insert 22 is detected by the detection rod 6
The first locking portion 61A is regulated by coming into contact with the inner front end of the case 60. A detector 65 by a limit switch or a proximity switch is arranged behind the detection rod 61 by being attached to the upper mold 1 by a bracket (not shown), and the insert 11 is lifted to move the back insert 2
2 in other words, in other words, when the insert 11 lands on the back insert 22, the detection rod 61 retracted by the guide inclined surface 64 of the insert 11 causes the detector 6
5 is activated.

The case 60, the detection rod 61, the guide member 62,
The spring 63 and the detector 65 constitute upper die insert landing detection means 66 for detecting landing of the insert 11.

The insert 12 of the lower mold 2 is also provided with a lower mold insert landing detection means 73 having the same structure as this, and the lower mold insert landing detection means 73 includes a case 67, a detection rod 68 having a locking portion 68A, and a guide. The insert 12 is provided with a guide inclined surface 71 with which the tip of the detection rod 68 abuts, which is composed of a member 69, a spring 70, and a detector 72.

The upper die and lower die insert landing detection means 66 and 73 are provided for each of the two cavities 3 in which the inserts 11 and 12 are arranged.

FIG. 7 is a control block diagram after the detectors 65 and 72 of the insert landing detection means 66 and 73, and the insert landing detection signals from the detectors 65 and 72 are input to the signal processing device 74. The signal from the detector 75 of the oil pressure detecting means 76 is also input to the signal processing device 74. The detector 75 detects the magnitude of the hydraulic pressure supplied to the hydraulic cylinders 19 and 26 by detecting the hydraulic pressure of the hydraulic circuits of the hydraulic cylinders 19 and 26. The magnitude of the hydraulic pressure is detected. By doing the insert 11,1
2 is the magnitude of the force with which the back insert 22 and the die mounting member 15 are in contact, in other words, the back insert 2
2. The magnitude of the landing force of the inserts 11 and 12 with respect to the die mounting member 15 is detected, and when the landing force reaches a predetermined level or more, the hydraulic pressure detector 75 causes the signal processing device 7 to operate.
The signal is output to 4.

The signal processing device 74 is composed of, for example, an AND circuit and a logic circuit other than the AND circuit, and all the insert landing detection means 6 are provided.
When signals are input from the detectors 65 and 72 of Nos. 6 and 73 and the detector 75 of the oil pressure detecting means 76, the signal processing device 74 outputs a signal to the controller 77.

The controller 77 drives and controls the injection molding machine 78 according to a program. Further, the drive control of the injection molding machine 78 by the controller 77 is performed by the controller 7.
The signal is interlocked until a predetermined signal is input to 7. Here, the predetermined signal is a signal indicating that the injection molding die is ready for the next injection molding work, and one of the signals is the signal processing device 7.
It is a signal from 4.

Although the signal processing device 74 and the controller 77 are shown separately in FIG. 7, it is of course possible to provide the signal processing device 74 as part of the controller 77.

As shown in FIG. 2, the inserts 11 and 12 have a stepped shape having large diameter portions 11A and 12A and small diameter portions 11B and 12B, and these large diameter portions 11A and 1A are
A guide taper surface 1 is provided between 2A and the small diameter portions 11B and 12B.
1C, 12C, and insert 1 like this
Guide taper surface 11 provided on the entire side surfaces of 1 and 12
When the inserts 11 and 12 are fitted in the insert fitting portions 13 and 14, C and 12C are inclined so as to form a tapered taper surface in the fitting direction. Since the injection molding die according to the present embodiment is for lens molding as described above, both the inserts 11 and 12 and the insert fitting portions 13 and 14 are formed in a round shape, and the insert fitting is performed. The diameter dimensions of the parts 13, 14 are the inserts 11, 1
2 Amount smaller than the large diameter portions 11A and 12A (for example, tens of μ)
m)), so that the insert fitting parts 13 and 14 are shaped to fit the inserts 11 and 12,
It is dimensioned.

As shown in FIG. 6, a flow groove 42 is formed in a C shape on the upper end surface of the insert 11, and the flow groove 42 is, for example, steam,
A temperature control fluid circulation groove for circulating a temperature control fluid such as water or air to set the temperature of the insert 11 to a predetermined value before, during, or after molding, and inside the back insert 22. Passages 43 and 44 for allowing the temperature control fluid to flow in and out of the circulation groove 42 are provided.

As described above, when the upper end surface of the insert 11 abuts on the back insert 22, the inflow port 43A of the passage 43, the outflow port 44A of the passage 44, and the both end portions 42A of the flow groove 42, which are open to the lower surface of the back insert 22, 42B and the positioning member 45 for performing this matching is fixedly provided on the lower surface of the back insert 22. The positioning member 45 is inserted into a portion of the T-shaped groove 24 close to the opening end 24A, that is, a portion deviated from the engagement position with the T-shaped clamp member 23 to position the insert 11. . Specifically, the lower portion of the positioning member 45 has a conical taper surface 45A that is tapered toward the insert 11, and the positioning member 45 is provided at the portion of the T-shaped groove 24 into which the positioning member 45 is inserted. An inclined surface 24B that widens toward the side is formed.

A temperature sensor 46, which is a thermocouple, is attached to the positioning member 45 in a state of protruding from the lower surface, and a small diameter hole 47 for inserting the temperature sensor 46 is provided on the bottom surface of the T-shaped groove 24 as shown in FIG. There is. The temperature sensor 46 is for detecting the temperature near the molding surface of the insert 11.

The insert 12 is also provided with the same structure as described above, that is, as shown in FIG. 2, a temperature control fluid circulation groove 48 is formed in the lower end surface of the insert 12,
When the lower end surface of the abutment member abuts on the die mounting member 15, the flow groove 48
Are fixed to the mold mounting member 15 so as to align both end portions of the mold with the inflow and outflow ports of a temperature control fluid passage (not shown) provided inside the mold mounting member 15, and the positioning member 49 has a taper. The surface 49A is provided, and the T-shaped groove 30 is provided with an inclined surface 30B. A temperature sensor 50 is attached to the positioning member 49, and the T-shaped groove 30
A small diameter hole 51 for inserting the temperature sensor 50 on the bottom of the
Is provided.

As shown in FIG. 1, temperature control fluid flow passages 52, 53, 54, 55 are also provided inside the mold bodies 4, 8 of the upper mold 1 and the lower mold 2.
The temperature of these mold bodies 4 and 8 is set to a predetermined value.

Since a large number of lenses having different curvatures are molded in the above, a plurality of inserts 11 and 12 forming a pair in the upper and lower direction are prepared having lens molding surfaces having different curvatures.

Next, the operation will be described.

When the inserts 11 and 12 are exchanged, the upper mold 1 including the mold mounting member 16 is lifted and the upper mold 1 and the lower mold 2 are separated from the parting line PL, and the piston rod of the hydraulic cylinder 19 is separated. 21 descends, the piston rod 28 of the hydraulic cylinder 26 rises, and the T-shaped clamp members 23 and 29 attached to the tips of these piston rods 21 and 28 project from the insert fitting portions 13 and 14. The inserts 11 and 12 newly mounted on the mold bodies 4 and 8 of the upper mold 1 and the lower mold 2 are held by a robot arm (not shown) and horizontally transferred from left to right in FIG. The clamp members 23 and 29 are inserted into the T-shaped grooves 24 and 30 of the inserts 11 and 12, respectively.
From the open end of 4, 30, the engagement begins, the insert 11,
It engages with the ends of the T-shaped grooves 24, 30 reaching the center of 12. This state is shown in FIG.

After this, the piston rod 21 of the hydraulic cylinder 19 is raised to pull up the insert 11, and the hydraulic cylinder 2
The piston rod 28 of 6 is lowered to pull down the insert 12. As a result, the inserts 11 and 12 are fitted into the insert fitting portions 13 and 14 having a shape and size suitable for the inserts 11 and 12.
Since the side surfaces of 1 and 12 are provided with the guide taper surfaces 11C and 12C which are tapered in the fitting direction as described above, the guide taper action of these guide taper surfaces 11C and 12C allows the inserts 11 and 12 to be inserted. Will be smoothly and smoothly inserted into the insert fitting portions 13 and 14.

In this way, the inserts 11 and 12 are moved in the direction perpendicular to the parting line PL, so that the inserts 11 and 12 are inserted into the insert fitting portions 13 and 14 having a shape and size suitable for the inserts 11 and 12. After this insertion is completed, the inserts 11 and 12 are arranged in accurate positioning with respect to the insert fitting portions 13 and 14, and the inserts 11 and 12 are attached to the mold bodies 4 and 8 of the upper mold 1 and the lower mold 2, respectively. It is mounted with a predetermined positioning accuracy.

In addition, the inserts 11 and 12 are inserted into the insert fitting portion 13,
After the insertion into the 14, the tapered surfaces 45A and 49A of the positioning members 45 and 49 become the inclined surfaces 2 of the T-shaped grooves 24 and 30.
4B and 30B, inserts 11 and 12 have tapered surfaces 45A and 49A and inclined surfaces 24B and 30.
When the insert 11 is positioned in the circumferential direction by the guide action of B, and the upper end surface of the insert 11 abuts against the pack insert 22 and the insert 11 is clamped, both ends 42A of the flow groove 42 shown in FIG. 42B
Exactly coincides with the inlet 43A and the outlet 44A.
Even when the lower end surface of the insert 12 comes into contact with the die mounting member 15 and the insert 12 is clamped, both ends of the flow groove 48 are aligned with the inlet and outlet (not shown) in the same manner as above. At this time, the temperature sensors 46 and 50 are inserted into the small diameter holes 47 and 51.

The diametrical positioning of the inserts 11 and 12 is
As described above, the T-shaped clamp members 23 and 29 are connected to the T-shaped groove 24,
This is done when engaging the end of 30.

As described above, when the piston rod 21 of the hydraulic cylinder 19 is raised, the upper end surface of the insert 11 comes into contact with the back insert 22 so that the insert 11 is landed, and when the piston rod 28 of the hydraulic cylinder 26 is lowered, the insert 12 moves. When the lower end surface abuts on the mold mounting member 15 and the insert 12 is landed, the insert 1
Since the detection rods 61 and 68 of the insert landing detection means 66 and 73 are retracted by the guide inclined surfaces 64 and 71 of Nos. 1 and 12, the detectors 65 and 72 are operated to detect the insert landing in the signal processing device 74. Output a signal. Further, when the hydraulic pressure supplied to the hydraulic cylinders 19 and 26 is larger than a predetermined level and the landing force of the inserts 11 and 12 is sufficiently large, this is the hydraulic pressure detecting means 7 described above.
No. 6 detector 75, and the detector 75 outputs a detection signal to the signal processing device 74.

In this way, when the signals from the detectors 65 and 72 of all the insert landing detection means 66 and 73 and the signals from the detector 75 of the hydraulic pressure detection means 76 are input to the signal processing device 74,
The signal processing device 74 outputs a signal to the controller 77,
As a result, the interlock of the controller 77 of the injection molding machine 78, which is performed at the time of starting the replacement work of the inserts 11 and 12, is released on condition that the predetermined signal from other than the signal processing device 74 is input to the controller 77. Then, the injection molding operation in the injection molding machine 78 is ready.

In the above, when a foreign substance has entered between the inserts 11 and 12, the back insert 22, and the die mounting member 15, even if a signal is output from the detector 75 of the hydraulic pressure detection means 76, the insert landing detection means 66. , 73 detector 6
No signal is output from 5,72. On the other hand, when the hydraulic pressure of the hydraulic cylinders 19 and 26 is reduced due to oil leakage in the hydraulic circuit, even if signals from the detectors 65 and 72 of the insert landing detection means 66 and 73 are output, the hydraulic pressure detection means. No signal is output from the detector 75 of 76. For this reason,
Insert landing detection means 66, 73 and hydraulic pressure detection means 76
By providing both of them, the preparation for the injection molding work in the injection molding die can be accurately confirmed.

Next, the upper mold 1 is lowered by the mold clamping cylinder, and the upper mold 1 and the lower mold 2 are clamped while aligning with the guide pin 18 and the positioning pin 56 shown in FIG.
Lose. After that, the injection molding machine 7 is driven while being controlled by the controller 77 in which the interlock is released as described above.
The molten resin is injected from the nozzle 8 into the sprue bush 57, and the molten resin is filled in the cavity 3 through the sprue 58 and the runner 59. At this time, the die mounting member 16 is raised by the gap S against the die clamping force of the die clamping cylinder by the cylinder (not shown), thereby increasing the vertical dimension of the cavity 3. In addition, the temperature of the upper mold 1 and the lower mold 2 is set to a required temperature by the temperature control fluid that has been circulated in the flow grooves 42, 48 and the flow passages 52, 53, 54, 55, and near the molding surfaces of the inserts 11, 12. The temperature is detected by the temperature sensors 46 and 50.

At this time, as described above, the inserts 11 and 12 land on the back insert 22 and the die mounting member 15 with a large force, and the inserts 11 in which the temperature control fluid circulation grooves 42 and 48 are formed.
Since the upper end surface of the insert 12 and the lower end surface of the insert 12 are in strong contact with the back insert 22 and the die mounting member 15, even if the temperature-regulating fluid under pressure is passed through the flow grooves 42, 48, the insert 11, 12 is back insert 2
2. It is not separated from the mold mounting member 15, and therefore the temperature control fluid can be circulated as desired. The same effect as this can be obtained when the high-pressure temperature control fluid is circulated in the circulation grooves 42, 48 before the molding is started or after the molding is finished because the inserts 11 and 12 are heated or cooled.

The molten resin in the cavity 3 is gradually solidified, and this solidification is performed while the molten resin receives the pressure of the insert 11 by the mold clamping force of the mold clamping cylinder, and the insert 11 follows the shrinkage of the molten resin due to the solidification. The insert 11 descends by the compression amount.

After the molten resin is solidified in the cavity 3, the upper mold 1 including the mold mounting member 16 is raised by the mold clamping cylinder to divide the upper mold 1 and the lower mold 2 into molds, and the ejects inserted from the holes 33 and 37. By pushing down the pressure receiving members 32 and 36 with the rod, the hydraulic cylinder 19 including the piston rod 21, the back insert 22, the insert 11, and the eject pin 35 are lowered, and the insert 11,
The molded product is ejected from the cavity 3 by the eject pin 35. When the pushing down of the pressure receiving members 32 and 36 by the eject rod is released, the insert 11 or the like is moved to the spring 4
It returns to the old position at 0,41.

The above injection molding is repeated to form the required number of lenses, and then the inserts 11 and 1 for molding the next lens.
When replacing 2, the upper mold 1 and the lower mold 2 are divided, and then the piston rod 21 of the hydraulic cylinder 19 is lowered and the piston rod 28 of the hydraulic cylinder 26 is raised, whereby the used insert 11 , 12 are projected from the insert fitting portions 13, 14. After that, the inserts 11 and 12 are held by the arm of the robot, and the inserts 11 and 12 are horizontally moved from right to left in FIG. 2 to move the T-shaped clamp members 2 from the T-shaped grooves 24 and 30.
3, 29 are removed, and the inserts 11, 12 are removed. By holding the new inserts 11 and 12 by the robot arm and moving them horizontally from left to right in FIG. 2, the T-shaped clamp member 23 is inserted into the T-shaped grooves 24 and 30 of the inserts 11 and 12 as described above. , 29 are engaged.

As described above, according to this embodiment, the insert 11,
The landing of the inserts 11 and 12 on the back insert 22 and the die mounting member 15 when the 12 is replaced is detected by the insert landing detection means 66 and 73, and the landing force of the inserts 11 and 12 is greater than a predetermined value. When the pressure reaches a certain level, this is detected by the oil pressure detecting means 76, and the interlock of the controller 77 of the injection molding machine 78 is released by the detection signals from these detecting means 66, 73, 76, so that the inserts 11, 12 are inserted. After the replacement of the inserts, the injection molding work performed by circulating the pressure-regulated fluid in the flow grooves 42, 48 of the inserts 11, 12 can be performed after surely confirming the preparation of the injection mold. Become.

Although the insert landing detection means 66, 73 of the above-described embodiments are configured by the detection rods 61, 68, the detectors 65, 72, etc., this configuration is arbitrary and is not limited to those of the above-described embodiments. If necessary, the one that can detect the landing of the insert may be used.

Further, although the molds of the above-described embodiments are for injection compression molding, the present invention can be applied to ordinary molds for injection molding without a compression allowance. Moreover, the present invention can be applied to other than the mold for lens molding, and the insert has an upper mold,
The present invention can also be applied to a case in which only one of the lower molds is provided, and the present invention can also be applied to a mold in which the parting line is in the vertical direction.

[Effect of device]

According to the present invention, it is confirmed that the insert is landed on the insert receiving member and that this landing is performed with a large force that does not separate the insert from the insert receiving member due to the pressure of the temperature control fluid. Then, the injection molding work can be started, and therefore, the injection molding work can be performed even when the low-pressure to high-pressure temperature control fluid is passed through the insert.

[Brief description of drawings]

1 is a front sectional view of an injection molding die, and FIG. 2 is a sectional view of FIG.
II-II line sectional view, FIG. 3 is a III-III line sectional view of FIG.
Fig. 4 is a sectional view of the insert, and Fig. 5 is VV of Fig. 4.
FIG. 6 is a perspective view showing the positional relationship between the insert and the positioning member, FIG. 7 is a control block diagram showing the insert landing detection means and the hydraulic pressure detection means, and FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... Upper mold, 2 ... Lower mold, 3 ... Cavity, 4, 8 ... Mold body, 11, 12 ... Insert, 13, 14 ... Insert fitting part, 15 ... Mold mounting member which is an insert receiving member,
19, 26 ... Hydraulic cylinder, 22 ... Back insert which is an insert receiving member, 42, 48 ... Temperature control fluid circulation groove, 66, 73 ... Insert landing detection means, 76 ... Hydraulic pressure detection means, 77 ... Controller, 78 ... Injection Molding machine.

Claims (1)

[Scope of utility model registration request] 1. An injection molding mold having a cavity formed therein, which is separable into at least two parts, and which includes at least one insert. While forming a groove, this end surface is brought into contact with the insert receiving member by the hydraulic pressure of the hydraulic cylinder to allow the insert to freely land on the insert receiving member, and the landing of the insert is detected by the insert landing detecting means, Further, the hydraulic pressure of the hydraulic cylinder is detected by the hydraulic pressure detecting means, and the interlock of the controller for driving and controlling the injection molding machine is released by the detection signals from the insert landing detecting means and the hydraulic pressure detecting means. Insert landing detection device for injection molds.