JP3361884B2 - Release device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold release device, and more particularly, to a molded product made of an elastic material such as a rubber-like elastic material having a cylindrical bellows shape having different diameters at both ends. The present invention relates to a release device effective for releasing a bellows and the like from a core. 2. Description of the Related Art Generally, a molded article (bellows or the like) made of an elastic body such as a rubber-like elastic body having a cylindrical bellows shape having different diameters at both ends conforms to the shape of the inner peripheral surface thereof. It is formed integrally with a suitable thickness on the peripheral surface of the formed core by vulcanization molding or the like. Various types of mold release devices have been proposed as mold release devices for releasing molded articles formed in this way. For example, mold release devices as shown in FIGS. 8 to 11 are already known. I have. [0004] That is, this release device is disclosed in
No. 94547, a release device described in Japanese Patent Application Laid-Open No. 94547, wherein a cylindrical outer jig 30 is provided so as to be able to advance and retreat in a horizontal direction, and is provided in the outer jig 30 and can advance and retreat integrally with the outer jig 30. And a cylindrical nozzle 31 which can move forward and backward in the axial direction of the outer jig 30 by itself and the outer jig 30
And a drive source (not shown) for moving the nozzle 31 forward and backward
And a pressure supply source (not shown) for supplying compressed air to the nozzle 31. In order to release the molded product 24 from the peripheral surface of the core 23 by using the release device configured as described above, first, the driving source is operated to activate the outer jig 30 and the nozzle. 31 is integrally advanced to a predetermined position, and the outer jig 3
A predetermined amount of the end of the core 23 is inserted into the inside of the zero. Next, only the nozzle 31 is further advanced, and its tip is inserted between the peripheral surface of the core 23 and the inner peripheral surface of the molded product 24, and the small-diameter opening 24 a of the molded product 24 is inserted into the nozzle 3.
1 between the outer peripheral surface of the tip 1 and the inner peripheral surface of the opening of the outer jig 30, and an appropriate gap is formed between the inner peripheral surface of the small-diameter opening 24 a of the molded product 24 and the peripheral surface of the core 23. Then, the compressed air is supplied from the tip of the nozzle 31 by operating the pressure supply source in the gap. As described above, the small-diameter opening 24 of the molded product 24 is formed.
a By supplying compressed air into the gap formed between the inner peripheral surface and the peripheral surface of the core 23, the molded product 24 gradually expands from the small-diameter opening 24a toward the large-diameter opening 24b. The compressed air is deformed and exhausted from the large-diameter opening 24b of the molded product 24. In this case, the small-diameter opening 24a of the molded product 24
Is different from the cross-sectional area of the large-diameter opening 24b, the large-diameter opening 24b and the small-diameter opening 24a of the molded product 24 are different.
A difference in the internal pressure causes a force acting on the molded product 24 from the large-diameter opening 24b toward the small-diameter opening 24a. At this point, it is attempted to move in the direction of the small-diameter opening 24a (the direction of the nozzle 31). Accordingly, the molded article 24 can be easily released from the peripheral surface of the core 23 by retracting the outer jig 30 and the nozzle 31 in synchronization with the force acting on the molded article 24. Become. However, while the force acting on the molded product 24 varies depending on the material of the molded product 24 and variations in finished dimensions, the speed at which the outer jig 30 and the nozzle 31 are retracted and the retraction are started. Since the timing is set to a predetermined value in advance, the two cannot be synchronized with each other, and the small-diameter opening 24a of the molded product 24 comes off from between the outer jig 30 and the nozzle 31. There was a problem that occurred. The present invention has been made to solve the above-mentioned problems of the prior art, and the force acting on a molded product by compressed air from the large-diameter opening to the small-diameter opening varies. It is another object of the present invention to provide a mold release device that does not cause a mold release error of a molded product at all. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is directed to releasing a molded product made of an elastic body having a cylindrical bellows shape having different diameters at both ends from a core. A mold device, which is provided so as to be able to advance and retreat, and a nozzle which can be inserted between a molded product and the core from the small-diameter opening side of the molded product at the time of advancement and supply compressed air therebetween. A driving source for moving the nozzle forward and backward, a pressure supply source for supplying compressed air to the nozzle, a detection unit for detecting a reaction force by a molded product acting on the nozzle, and a signal from the detection unit. And means for controlling the drive source. According to the present invention, by adopting the above-described means, the nozzle is advanced by the drive source and the tip is inserted between the inner peripheral surface of the molded product and the peripheral surface of the core. With
When compressed air is supplied between the molded product and the core through the nozzle by the compression supply source, the molded product gradually expands and deforms from the small-diameter opening to the large-diameter opening, and the large-diameter opening of the molded product is formed. Compressed air is exhausted from the. Here, since the cross-sectional areas of the small-diameter opening and the large-diameter opening of the molded product are different from each other, a difference occurs in the internal pressure between the two openings, and the difference in the internal pressure causes the molded product to have a small-diameter opening from the large-diameter opening. A force directed toward the portion acts, and a reaction force against this force is generated in the nozzle. The reaction force acting on the nozzle is detected by the detecting means. The speed of the nozzle is adjusted by controlling the drive source via the control means in accordance with the signal detected by the detection means. Therefore, even if the force acting on the molded article from the large-diameter opening toward the small-diameter opening varies, the nozzle speed can be adjusted to synchronize with the force. An embodiment of the present invention shown in the drawings will be described below. 1 to 5 show a first embodiment of a mold release apparatus according to the present invention. FIG. 1 is a schematic diagram showing the whole, and FIGS. 2 to 5 are explanatory diagrams showing a procedure of mold release. is there. That is, the release device shown in this embodiment is:
A nozzle 1 provided so as to be able to advance and retreat in the horizontal direction, a support member 17 for supporting the nozzle 1 so as to be able to advance and retreat in the horizontal direction,
A pressure supply source 7 for supplying compressed air to the nozzle 1; and a directional control valve 5 provided between the nozzle 1 and the pressure supply source 7 for controlling the direction of compressed air from the pressure supply source 7.
A load cell 8 which is connected to the nozzle 1 and serves as detecting means for detecting a reaction force of the molded product 24 acting on the nozzle 1; a servo motor 15 which is a drive source for moving the nozzle 1 forward and backward; CP, which is a control means for controlling the transmission member 10 for transmitting the driving force of the nozzle 15 to the nozzle 1, the directional control valve 5, and controlling the servomotor 15 in accordance with a signal from the load cell 8.
U22. The nozzle 1 has a cylindrical shape with one end closed, the load cell 8 is mounted on the closed one end, and a projection 2 projecting annularly in the axial direction is integrally formed at the opening. In addition, a communication hole 3 communicating the inside and outside is formed in the outer peripheral surface. The directional control valve 5 is connected to the communication hole 3 of the nozzle 1 via a pipe 4, and the directional control valve 5 is connected to the pressure supply source 7 via a pipe 6. Has become. Therefore, the compressed air from the pressure supply source 7 is supplied to the inside of the nozzle 1 through the pipe 6, the direction control valve 5, the pipe 4, and the communication hole 3. The protrusion 2 at the opening of the nozzle 1 is formed in such a size that it can be inserted between the inner peripheral surface of the molded product 24 and the peripheral surface of the core 23, which will be described later. An appropriate gap is formed between the core and the core 23. Therefore, the compressed air supplied from the pressure supply source 7 to the inside of the nozzle 1 flows from the tip of the nozzle 1 to the molded product 24.
And the core 23. A connection plate 9 is connected to the load cell 8. The connection plate 9 is connected to one end of the ball screw 11 of a transmission member 10 including a ball screw 11 and a nut 12, and a guide bush 18 and a guide rail 19. One ends of the guide rails 19 of the support member 17 are integrally connected to each other.
And the guide rail 19 are connected to the connecting plate 9 so as to be parallel to each other. A gear 13 is integrally connected to the nut 12, and the gear 13 meshes with a gear 16 of the servomotor 15 mounted on a base 14. Therefore, the servo motor 15
By rotating the nut 12, the nut 12 rotates via the two gears 13 and 16, and the ball screw 11 advances and retreats in the horizontal direction in accordance with the rotation of the nut 12, and is integrated with the ball screw 11 via the connecting plate 9. The connected load cell 8 and nozzle 1 move in the horizontal direction. The guide bush 18 and the guide rail 19 of the support member 17 are relatively slidable. In this case, since the guide bush 18 is fixed to the base 14, the guide rail 19 can move forward and backward with respect to the guide bush 18. The load cell 8 and the nozzle 1 are supported movably in the horizontal direction. Reference numeral 20 denotes a motor driver for amplifying a signal from the servo motor 15, and 21 denotes a throttle valve (flow rate adjustment).
Valve) . Next, the operation of the above-described device will be described. First, a molded article 2 made of an elastic body such as a rubber-like elastic body having a cylindrical bellows shape having a diameter gradually increasing from one end to the other end.
4 is integrally formed with an appropriate thickness on the peripheral surface of the core 23 formed in a shape conforming to the inner peripheral surface thereof by vulcanization molding or the like,
This is located at an appropriate position on the base 14. Next, the servo motor 15 is operated to rotate the nut 12 via the gear 16 on the servo motor 15 side and the gear 13 on the nut 12 side of the transmission member 10, and the ball screw 11 is moved in the direction of the core 23. While moving forward, the load cell 8 and the nozzle 1 are advanced through the connecting plate 9 by following the ball screw 11, and the protrusion 2 at the tip of the nozzle 1 is moved to the inner peripheral surface of the molded product 24 and the peripheral surface of the core 23. A gap is formed between the molded product 24 and the core 23 by inserting the molded product 24 from the side of the small-diameter opening 24a between the molded product 24 and the surface. Next, the pressure supply source 7 is operated, and the pipe 6,
Nozzle 1 through directional control valve 5, pipe 4 and communication hole 3
While supplying compressed air into the gap from the tip of the nozzle 1. Thus, the inner peripheral surface of the molded product 24 and the core 2
By supplying compressed air into the gap formed between the large-diameter opening 3b and the large-diameter opening 24b, the molded product 24 gradually expands and deforms from the small-diameter opening 24a to the large-diameter opening 24b. Compressed air is exhausted from 24b. In this case, the large-diameter opening 24b of the molded product 24
And the small-diameter opening 24a have a different cross-sectional area, a difference occurs in the internal pressure acting on the two openings 24a and 24b. The difference in the internal pressure causes the molded product 24 to move from the large-diameter opening 24b to the small-diameter opening 24a. To the molded product 24
A reaction force against the force acting on the nozzle 1 is generated in the nozzle 1. Here, the reaction force against the molded product 24 generated in the nozzle 1 is detected by a load cell 8 connected to the nozzle 1, and a signal detected by the load cell 8 is sent to the CPU 22. Of the servo motor 15 via the motor driver 20 in accordance with the signal of
Is controlled, the rotation of the nut 12 is adjusted via the gear 16 of the servo motor 15 and the gear 13 of the nut 12 of the transmission member 10, and the retreat speed of the ball screw 11 is adjusted by the rotation of the nut 12. Become. Therefore, the retreating speed of the ball screw 11, that is, the retreating speed of the nozzle 1, can be adjusted in accordance with the force acting on the molded product 24 from the large-diameter opening 24b toward the small-diameter opening 24a. Even if the force acting on the molded product 24 varies due to the above factors, the force is detected one by one by the load cell 8 and processed by the CPU 22 to synchronize the force acting on the molded product 24 with the retreat speed of the nozzle 1. Can be done. As a result, the small-diameter opening 24a of the molded product 24
Does not cause a mold release error of the molded product 24, and the molded product 24 can be reliably released from the peripheral surface of the core 23. FIG. 6 shows a second embodiment of the release apparatus according to the present invention.
In the mold release apparatus shown in this embodiment, a cylindrical rupture prevention cover 25 surrounding the molded product 24 is integrally provided outside the nozzle 1. The other configuration is the same as that shown in the first embodiment. The release apparatus shown in this embodiment also exhibits the same operation and effects as those of the first embodiment, and the large-diameter opening 24b acting on the molded product 24 and the small-diameter opening 24a The retreat speed of the ball screw 11, that is, the retreat speed of the nozzle 1, can be adjusted according to the force toward the load cell. Therefore, even if the force acting on the molded product 24 varies for any reason, the force is applied to the load cell. By detecting at 8 and processing by the CPU 22, the force acting on the molded article 24 and the retreat speed of the nozzle 1 can be synchronized. Therefore, the small-diameter opening 24 of the molded product 24
Even if b is not clamped, there is no occurrence of a mold release error of the molded product 24, and the molded product 24 can be reliably released from the peripheral surface of the core 23. Further, since the mold release apparatus shown in this embodiment is provided with the cover 25 for preventing rupture surrounding the molded product 24, the expansion deformation of the molded product 24 when compressed air is supplied is limited. Thus, the molded product 24 can be prevented from being ruptured. FIG. 7 shows a third embodiment of the release apparatus according to the present invention.
In the mold release apparatus shown in this embodiment, a three-jaw chuck 26 is integrally provided outside the nozzle 1, and the other structure is shown in the first embodiment. It has the same configuration as the one described above. The release device shown in this embodiment also exhibits the same operation and effect as those of the first embodiment, in which the large-diameter opening 24b acting on the molded product 24 and the small-diameter opening 24a The retreat speed of the ball screw 11, that is, the retreat speed of the nozzle 1, can be adjusted according to the force toward the load cell. Therefore, even if the force acting on the molded product 24 varies for any reason, the force is applied to the load cell. By detecting at 8 and processing by the CPU 22, the force acting on the molded article 24 and the retreat speed of the nozzle 1 can be synchronized. Therefore, the small-diameter opening 24 of the molded product 24
Even if a is not clamped, there is no occurrence of a mold release error of the molded product 24, and the molded product 24 can be reliably released from the peripheral surface of the core 23. In this embodiment, since the three-jaw chuck 26 is integrally provided outside the nozzle 1, the small-diameter opening 24a of the molded product 24 is formed.
Of the molded product 24 can be more reliably held. According to the present invention, as described above, a nozzle is inserted between the inner peripheral surface of the molded article and the peripheral surface of the core, and the molded article and the core are inserted through the nozzle. When compressed air is supplied from the pressure supply source during the period, the molded product gradually expands and deforms from the small-diameter opening toward the large-diameter opening, and the compressed air is exhausted from the large-diameter opening of the molded product. Become. in this case,
Since the cross-sectional areas of the large-diameter opening and the small-diameter opening of the molded product are different, a difference occurs in the internal pressure acting on both the openings of the molded product. Due to this internal pressure difference, the molded product has a large-diameter opening and a small-diameter opening. A force in the direction of the part acts, and a reaction force against this force is generated in the nozzle. The reaction force of the molded product acting on the nozzle is detected by the detection means, and the control means controls the drive source for moving the nozzle forward and backward in accordance with a signal from the detection means, thereby adjusting the advance / retreat speed of the nozzle. Will be done. Therefore, even if the force acting on the molded article from the large-diameter opening toward the small-diameter opening varies for some reason, the nozzle advance / retreat speed can be adjusted to synchronize with the variation. As a result, there is an excellent effect that the molded article can be reliably released from the peripheral surface of the core without causing a release error.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a first embodiment of a release device according to the present invention. FIG. 2 is an explanatory view showing a procedure of releasing the mold shown in FIG. 1, and is an explanatory view showing a state before expansion and deformation of a molded article. FIG. 3 is an explanatory view showing a procedure of releasing the mold shown in FIG. 1, and is an explanatory view showing an initial state of expansion and deformation of a molded article. FIG. 4 is an explanatory view showing a procedure of releasing the mold shown in FIG. 1, and is an explanatory view showing a state of a molded product at a later stage of expansion deformation. FIG. 5 is an explanatory view showing a procedure of releasing the mold shown in FIG. 1, and is an explanatory view showing a state in which a molded article is released. FIG. 6 is a schematic view showing a second embodiment of the release device according to the present invention. FIG. 7 is a schematic view showing a third embodiment of the release device according to the present invention. FIG. 8 is a schematic diagram showing a conventional release device, and is an explanatory diagram showing a positional relationship between a core and a release device. FIG. 9 is a schematic view showing a conventional release device, and is an explanatory view showing a state where an end of a core is inserted into an outer jig of the release device. FIG. 10 is a schematic diagram showing a conventional release device, and is an explanatory diagram showing a state where a nozzle of the release device is inserted between a molded product and a core. FIG. 11 is a schematic view showing a conventional release device, and is an explanatory view showing a state in which a molded product is released from a core. [Description of Signs] 1, 31... Nozzle 2... Protrusion 3... Communication holes 4, 6... Piping 5. Plate 10 Transmission member 11 Ball screw 12 Nuts 13 and 16 Gears 14 Base 15 Drive source (servo motor) 17 Support member 18 Guide bush 19 Guide rail 20 ... Motor driver 21 ... Throttle valve (flow regulating valve) 22 ... Control means (CPU) 23 ... Core 24 ... Molded product 24a ... Small diameter opening 24b ... Large diameter opening 25 ... Cover 26 ...... Three-jaw chuck 30 Outside jig

Claims (1)

(1) A mold release device for releasing a molded product (24) made of an elastic body having a cylindrical bellows shape having different diameters at both ends from a core (23), It is provided so that it can advance and retreat,
At the time of forward movement, the front end has a small diameter opening (2) of the molded product (24).
4a) Nozzle (1) inserted between molded article (24) and core (23) from the side and capable of supplying compressed air between them
A driving source (15) for moving the nozzle (1) forward and backward;
A pressure supply source (7) for supplying compressed air to the nozzle (1), and a molded product (24) acting on the nozzle (1)
And a control means (22) for controlling the drive source (15) according to a signal from the detection means (8). apparatus.