JP2012131199A - Cooling mechanism for injection mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling mechanism for an injection mold which enables a pair of molds to be cooled equally in a specified time.SOLUTION: The cooling mechanism includes cooling passages 12 and 13, which are formed in each molds 1 and 2 so as to close a pair of molds 1 and 2 thereby making them communicate with each other by abutting the mating faces 1b and 2b of the molds 1 and 2 on each other, and a cooling water supply control means 14, which detects the drive of a mold advance and retreat driving mechanism 11 for opening and closing the pair of molds 1 and 2 by advancing and retreating the molds 1 and 2 and supplies and circulates cooling water W to the cooling passages 12 and 13 for a specified time after the pair of molds 1 and 2 are closed.

Description

  The present invention relates to a cooling mechanism for an injection mold.

  For example, when a joint or the like is manufactured by injection molding, as shown in FIGS. 4 and 5, a pair of substantially cylindrical core molds (an inner mold, a pair of molds 1 and 2) are closed and the outer A molten resin is injected and filled into a cavity H formed between the mold (cavity mold) 3. At this time, the core molds 1 and 2 are cooled by the cooling mechanism 4, and the hardening of the injection-filled molten resin is promoted to increase the productivity.

  The cooling mechanism 4 extends from the rear ends 1a and 2a of the pair of core molds 1 and 2 toward the mold mating surfaces 1b and 2b, and further from the vicinity of the mating surfaces 1b and 2b. A configuration in which cooling channels 5 and 6 extending to the rear ends 1a and 2a are provided in each of a pair of core molds 1 and 2 is widely used (for example, see Patent Document 1). In the cooling mechanism 4, the cooling water W is supplied from the inlets on the mold rear ends 1a, 2a side and circulated, and the cooling water W flowing through the cooling flow paths 5, 6 and the core molds 1, 2 The molds 1 and 2 are cooled by causing heat exchange between them.

JP 2010-99964 A

  However, in the conventional injection mold (cooling mechanism 4), cooling channels 5 and 6 are formed in each of the pair of core molds 1 and 2, and the rear ends 1a of the molds 1 and 2 are formed. Cooling water W is circulated from the 2a side to the mating surfaces 1b and 2b and from the mating surfaces 1b and 2b to the rear ends 1a and 2a to cool the dies 1 and 2. For this reason, the mating surfaces 1b and 2b side of the molds 1 and 2 are difficult to be cooled, and cooling of this portion may be insufficient. If the mating surfaces 1b and 2b are not sufficiently cooled as described above, the temperature of the molten resin (molded product) filled in the cavity H becomes non-uniform, and the molded product is subject to thermal deformation and distortion. there were.

  The cooling mechanism of the injection mold according to claim 1 includes a cooling flow path formed in each mold so as to close and communicate with the pair of molds by bringing the mating surfaces of the molds into contact with each other. Detecting the drive of the mold advancing / retracting driving means for opening and closing the pair of molds by moving the mold back and forth, and supplying cooling water to the cooling flow path for a predetermined time after the pair of molds are closed. And a cooling water supply control means for circulating.

  The injection mold cooling mechanism according to claim 2 is the injection mold cooling mechanism according to claim 1, wherein after the predetermined time has elapsed, compressed air is supplied to the cooling flow path. Compressed air supply control means for circulation is provided.

  In the cooling mechanism of the injection mold according to the first aspect, a cooling flow path is formed in each mold, the pair of molds are closed, and the cooling flow paths of the respective molds communicate with each other. Then, the cooling water is supplied and circulated through the cooling flow path for a predetermined time after the pair of molds are closed by the cooling water supply control means. As a result, the cooling water passes through the mating surface and circulates from one mold to the other. Therefore, unlike the conventional cooling mechanism, the mold mating surface side is difficult to be cooled and partially cooled. Will not be insufficient. That is, the mold can be cooled uniformly for a predetermined time. Therefore, the temperature of the molten resin (molded product) filled in the cavity can be reliably made uniform, and the molded product can be suitably manufactured without causing thermal deformation or distortion.

  3. The cooling mechanism for an injection mold according to claim 2, wherein after a predetermined time has passed after supplying the cooling water to the cooling flow path, the compressed air supply control means detects this and compresses it into the cooling flow path. Supply and distribute air. As a result, the mold can be uniformly cooled, and the cooling water can be removed from the cooling flow path, so that a molded product can be manufactured efficiently.

It is a figure which shows the cooling mechanism of the injection mold which concerns on one Embodiment of this invention. It is a figure which shows the cooling mechanism of the injection mold which concerns on one Embodiment of this invention. It is a figure which shows the modification of the cooling mechanism of the injection mold which concerns on one Embodiment of this invention. It is a figure which shows the cooling mechanism of the conventional injection mold. It is a X1-X1 line arrow directional view of FIG.

  Hereinafter, with reference to FIG.1 and FIG.2, the cooling mechanism of the injection mold which concerns on one Embodiment of this invention is demonstrated. Here, in this embodiment, it demonstrates as what cools a pair of substantially cylindrical core metal mold | die used when manufacturing a coupling etc. by injection molding, for example by a cooling mechanism.

  As shown in FIGS. 1 and 2, the cooling mechanism A for the injection mold according to this embodiment is a pneumatic cylinder for moving the pair of core molds (molds) 1 and 2 forward and backward to open and close the mold. (Mold Advancing / Retracting Driving Units) 10 and 11 and the mating surfaces 1b and 2b of the core molds 1 and 2 are brought into contact with each other so that the pair of core molds 1 and 2 are closed at the same time. The cooling channels 12 and 13 are formed in the core molds 1 and 2, and the cooling water supply control means 14 that supplies and circulates the cooling water W to the cooling channels 12 and 13 is configured.

  The cooling channels 12 and 13 formed in the pair of core molds 1 and 2 are formed to extend from the rear ends 1a and 2a of the core molds 1 and 2 to the mating surfaces 1b and 2b. . Moreover, the cooling flow path 12 of one core metal mold | die 1 is formed in communication with the water flow part engaging hole 15 dented toward the rear end 1a side of the axis O1 direction from the mating surface 1b. Furthermore, the other core mold 2 is provided with a water passage portion 16 that protrudes from the mating surface 2b toward the outer side (front side) in the axis O1 direction. The cooling channel 13 of the other core mold 2 is It is formed so as to extend from the rear end 2 a side in the direction of the axis O <b> 1 and open at the tip of the water flow portion 16. Further, a seal member 17 such as an O-ring is attached to the outer periphery of the water passing portion 16.

  Further, one core mold 1 is formed with a guide hole 18 that is recessed from the mating surface 1b toward the rear end 1a in the axis O1 direction, and the other core mold 2 projects outward from the mating surface 2b in the axis O1 direction. A guide pin 19 is integrally formed.

  On the other hand, the cooling water supply control means 14 for supplying and circulating the cooling water W to the cooling flow path 13 (14) operates by receiving the sensor 20 for detecting the expansion and contraction drive of the pneumatic cylinder 11 and the signal of the sensor 20. A timer 21 and an electromagnetic valve (first electromagnetic valve) 22 that opens only during the timer operation and supplies the cooling water W to the cooling flow path 13 (14) to flow therethrough are configured. A pipe 23 connected to a cooling water supply means such as a pump is connected to the cooling flow path 13, and the electromagnetic valve 22 is attached to the pipe 23.

  In this embodiment, as shown in FIGS. 1 and 2, when the pneumatic cylinders 10 and 11 are driven to advance the core molds 1 and 2, the other is inserted into the guide hole 18 of one core mold 1. The guide pins 19 of the core mold 2 are inserted, the guide holes 18 and the guide pins 19 are guided to each other, and the pair of core molds 1 and 2 are respectively positioned at predetermined positions. At this time, when the guide pin 19 interferes, the interlock is applied, and the mold closing operation of the pair of core molds 1 and 2 is controlled to stop.

  Further, when the guide hole 18 and the guide pin 19 guide each other and the core molds 1 and 2 further advance, the water flow of the other core mold 2 enters the water passage engaging hole 15 of one core mold 1. The part 16 is engaged, and the mating surfaces 1b and 2b of the pair of core molds 1 and 2 come into contact with each other to close the mold. In this way, with the pair of core molds 1 and 2 closed, the cooling flow path 12 of one core mold 1 and the cooling flow path 13 of the other core mold 2 are the water flow section 16 and the water flow section. Communication is established by engagement of the engagement holes 15. In addition, since the seal member 17 is provided on the outer periphery of the water flow portion 16, the cooling flow paths 12 and 13 of the pair of core molds 1 and 2 communicate with each other in a state where water tightness is ensured. The water passage 16 is accurately inserted into the water passage engaging hole 15 by engaging the water passage 16 with the water passage engaging hole 15 while the guide hole 18 and the guide pin 19 guide each other. (Engagement), and it is possible to prevent the water passage 16 from being damaged.

  Then, as shown in FIG. 2, when the mold closing of the pair of core molds 1 and 2 is completed and the outer mold 3 is installed, the core molds 1 and 2 are melted in the cavities H of the injection molds 1, 2 and 3. The resin 24 is injected and filled, and the molds 1 and 2 are cooled by the cooling mechanism A, whereby the injection-filled molten resin 24 is cured.

  Further, when cooling the injection molds 1 and 2 by the cooling mechanism A of the present embodiment (in the cooling method of the injection molds 1 and 2 by the cooling mechanism A of the present embodiment), a pair of cores When the molds 1 and 2 are closed, the sensor 20 of the cooling water supply control means 14 detects the driving of the pneumatic cylinder 11. Then, a forward limit detection signal of the pneumatic cylinder 20 is sent from the sensor 20 to the timer 21 and the timer 21 is activated. Simultaneously with the operation of the timer 21, the electromagnetic valve 22 is opened to start the flow of the cooling water W, and the cooling water W flows through the cooling channels 12 and 13 of the paired core molds 1 and 2. The core molds 1 and 2 are uniformly cooled.

  In addition, the predetermined time has elapsed, the operation of the timer 20 measuring this is stopped, the electromagnetic valve 22 is closed, and the flow of the cooling water W is stopped. At this time, by setting a predetermined time in advance, the core molds 1 and 2 are uniformly cooled for a predetermined time, whereby the temperature of the molten resin 24 (molded product) filled in the cavity H is increased. Ensure uniformization. Then, while a predetermined molding time elapses, the pneumatic cylinders 10 and 11 are driven backward to open the pair of core molds 1 and 2 to take out the molded product. At this time, since the temperature of the molten resin 24 filled in the cavity H is made uniform by the cooling mechanism A of the present embodiment, the molded product is manufactured in a suitable state free from thermal deformation and distortion.

  Therefore, in the cooling mechanism A for the injection mold according to the present embodiment, the cooling channels 12 and 13 are formed in the respective molds 1 and 2, the pair of molds 1 and 2 are closed, and each mold is closed. The cooling channels 12 and 13 communicate with each other. The cooling water supply control means 14 supplies the cooling water W to the cooling flow paths 12 and 13 for a predetermined time after the pair of molds 1 and 2 are closed. As a result, the cooling water W passes through the mating surfaces 1b and 2b and flows from one mold 2 to the other mold 1, so that the mating surfaces of the molds 1 and 2 as in the conventional cooling mechanism. The 1b and 2b sides are not easily cooled, and there is no case where the cooling is partially insufficient. That is, the molds 1 and 2 can be uniformly cooled for a predetermined time. Therefore, the temperature of the molten resin 24 filled in the cavity H can be surely made uniform, and a molded product can be suitably manufactured without causing thermal deformation or distortion.

  As mentioned above, although one embodiment of the cooling mechanism of the injection mold according to the present invention has been described, the present invention is not limited to the above-mentioned one embodiment, and can be appropriately changed without departing from the gist thereof. is there.

  For example, as shown in FIG. 3, after a predetermined time has passed since the mold was closed, the cooling mechanism A is provided with a compressed air supply control means 25 for supplying the compressed air S to the cooling flow passages 12 and 13 for circulation. It may be configured. That is, the cooling mechanism A includes sensors 20, 26 for detecting the driving of the pneumatic cylinders 10, 11, a first electromagnetic valve 22 for supplying the cooling water W to the cooling flow paths 12, 13, and the cooling water. A second electromagnetic valve 27 for discharging W from the cooling flow paths 12 and 13, a third electromagnetic valve 28 (25) for supplying compressed air S to the cooling flow paths 12 and 13, and cooling the compressed air S A fourth solenoid valve 29 (25) for discharging from the flow paths 12, 13, a first timer 21 for controlling the opening and closing of the first solenoid valve 22 and the second solenoid valve 27, and a third solenoid valve 28; A second timer 30 (25) for controlling the opening and closing of the fourth electromagnetic valve 29 may be provided.

  In this case, when the pair of core molds 1 and 2 are closed, the sensors 20 and 26 of the coolant supply control means 14 detect the driving of the pneumatic cylinders 10 and 11. A forward limit detection signal of the pneumatic cylinders 10 and 11 is sent from the sensors 20 and 26 to the first timer 21, and at the same time the first timer 21 is activated, the first electromagnetic valve 22 and the second electromagnetic valve 27 are opened. Then, the cooling water W starts to flow. Thereby, each core metal mold | die 1 and 2 is cooled uniformly.

  Next, a predetermined time elapses, the operation of the first timer 21 measuring this stops, and the first electromagnetic valve 22 and the second electromagnetic valve 27 are closed to stop the flow of the cooling water W. . Further, the first timer 21 is stopped and the second timer 30 is activated to start counting time. As the second timer 30 starts counting, the third solenoid valve 28 and the fourth solenoid valve 29 are opened to allow the compressed air S to flow through the cooling passages 12 and 13. Moisture is removed. Further, when the predetermined time has elapsed, the third electromagnetic valve 28 and the fourth electromagnetic valve 29 are closed, and the mold opening operation is started.

  Therefore, after the cooling water W is supplied to the cooling flow paths 12 and 13 and a predetermined time has elapsed in this way, the compressed air supply control means 25 detects and distributes the compressed air S to the cooling flow paths 12 and 13. By doing so, the molds 1 and 2 can be uniformly cooled, and the cooling water W can be removed from the cooling flow paths 12 and 13, thereby making it possible to manufacture a molded product efficiently.

1 Mold (core mold)
1a Rear end 1b Mating surface 2 Mold (core mold)
2a Rear end 2b Mating surface 3 Outer mold (cavity mold)
4 Conventional cooling mechanism 5 Cooling flow path 6 Cooling flow path 10 Pneumatic cylinder (Die advance / retreat drive means)
11 Pneumatic cylinder (Mold advance / retreat drive)
12 Cooling channel 13 Cooling channel 14 Cooling water supply control means 15 Water passage engaging hole 16 Water passing portion 17 Seal member 18 Guide hole 19 Guide pin 20 Sensor 21 Timer (first timer)
22 Solenoid valve (first solenoid valve)
23 Piping 24 Molten resin 25 Compressed air supply control means 26 Sensor 27 Solenoid valve (second solenoid valve)
28 Solenoid valve (third solenoid valve)
29 Solenoid valve (4th solenoid valve)
30 timer (second timer)
A Cooling mechanism of injection mold H Cavity O1 Axis S Compressed air W Cooling water

Claims (2)

Cooling channels formed in each mold so that the mating surfaces of the molds are brought into contact with each other to close and communicate with the pair of molds;
Detecting the drive of the mold advancing / retracting driving means for opening and closing the pair of molds by moving the mold back and forth, and supplying cooling water to the cooling channel for a predetermined time after the pair of molds are closed. A cooling mechanism for an injection mold, comprising: a cooling water supply control means for circulation. In the cooling mechanism of the injection mold according to claim 1,
A cooling mechanism for an injection mold, comprising compressed air supply control means for supplying compressed air to the cooling flow path after the predetermined time has passed.

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