JPH07323430A - Molding parting device - Google Patents

Abstract

PURPOSE:To eliminate an error in parting a molding from a mold by synchronizing the parting speed of a molding with the motion speed of a nozzle advance and retreat. CONSTITUTION:A nozzle 1 is moved back and forth in a level direction by connecting the nozzle 1 to a servo motor 15, and the same time, a compressed air can be supplied into the interior by connecting a pressure supply source to the interior through piping. On the other hand, a load cell 8 is connected to the nozzle 1 so that a load acting on the nozzle can be detected, and at the same time, both load cell 8 and servo motor 15 are connected to CPU 22. The nozzle is moved forward to introduce its tip part into a space between a core and a molding, and a compressed air is fed into a space between the core and the molding. Consequently, a force heads for the nozzle 1 works on the molding, and at the same time, a reaction force corresponding to the force generates in the nozzle 1. This reaction force is detected using the load cell 8 and thereby the rotation of the servo motor 15 is controlled through CPU 22. Thus the parting speed of a molding can be synchronized with the shuttle motion speed of the nozzle 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold releasing device, and more particularly, a molded product (bellows, etc.) made of an elastic body such as a rubber-like elastic body having a cylindrical bellows shape with different diameters at both ends is released from a core. The present invention relates to a release device effective for

[0002]

2. Description of the Related Art Generally, a molded product (bellows, etc.) made of an elastic body such as a rubber-like elastic body having a cylindrical bellows shape with different diameters at both ends is formed into a shape that matches the shape of the inner peripheral surface thereof. The core is integrally formed with a proper thickness on the peripheral surface of the core by vulcanization molding or the like.

Various types of mold releasing devices have been proposed as a mold releasing device for releasing a molded product thus formed. For example, the mold releasing devices shown in FIGS. 8 to 11 are already known. There is.

That is, this mold releasing device is disclosed in Japanese Utility Model Application No. 56-
A mold releasing device described in Japanese Patent Publication No. 94547, which is a tubular outer jig 30 that can be moved forward and backward in a horizontal direction, and can be integrally moved with the outer jig 30 provided inside the outer jig 30. In addition, the cylindrical nozzle 31 that can advance and retreat in the axial direction of the outer jig 30 alone and the outer jig 30
And a drive source for moving the nozzle 31 forward and backward (not shown)
And a pressure supply source (not shown) for supplying compressed air to the nozzle 31.

Then, in order to release the molded product 24 from the peripheral surface of the core 23 by using the releasing device constructed as described above, first, the driving source is operated to operate 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 portion of the core 23 is inserted into the inside of 0.

Next, only the nozzle 31 is further advanced so that 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 24a of the molded product 24 is inserted into the nozzle 3.
It is sandwiched between the outer peripheral surface of the tip portion of No. 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 24a of the molded product 24 and the peripheral surface of the core 23. Then, a pressure supply source is operated into this gap to supply compressed air from the tip of the nozzle 31.

As described above, the small diameter opening 24 of the molded product 24
By supplying compressed air into the gap formed between the inner peripheral surface of the a and the peripheral surface of the core 23, the molded product 24 gradually expands from the small diameter opening 24a side toward the large diameter opening 24b side. The deformed compressed air is 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
The cross-sectional area of the molded product 24 is different from the cross-sectional area of the large-diameter opening 24b.
A difference occurs in the internal pressure of the molded product 24. Due to this difference in the internal pressure, a force is applied to the molded product 24 from the large-diameter opening 24b toward the small-diameter opening 24a. In the direction of (a), it tries to move in the direction of the small-diameter opening 24a (direction of the nozzle 31).

Therefore, by retracting the outer jig 30 and the nozzle 31 in synchronism with the force acting on the molded product 24, the molded product 24 can be easily released from the peripheral surface of the core 23. Become.

However, while the force acting on the molded product 24 changes depending on the material of the molded product 24 and variations in the finished dimensions, the speed at which the outer jig 30 and the nozzle 31 are retracted and the backward movement is 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 between the outer jig 30 and the nozzle 31, resulting in a mold release error. There was a problem that occurred.

The present invention solves the above-mentioned problems of the conventional ones, in which the force exerted on the molded article by the compressed air from the large diameter opening toward the small diameter opening varies. Also, it is an object of the present invention to provide a mold releasing apparatus in which there is no risk of a mold release error of a molded product.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a mold releasing device for releasing a molded product made of a cylindrical bellows-like elastic body having different diameters at both ends from a core. There is a nozzle that is provided so as to be able to move forward and backward, and at the time of forward movement, insert the tip between the molded product and the core from the small-diameter opening side of the molded product and supply compressed air between the two, A drive source for moving the nozzle forward and backward, a pressure supply source for supplying compressed air to the nozzle, a detection means for detecting a reaction force of a molded product acting on the nozzle, and the drive source according to a signal from the detection means. The control means for controlling is adopted.

[0013]

According to the present invention, by adopting the above means, the nozzle is advanced by the drive source to insert the tip end portion between the inner peripheral surface of the molded product and the peripheral surface of the core, and
When compressed air is supplied from the compression source between the molded product and the core through the nozzle, 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. The compressed air is exhausted from. Here, since the cross-sectional areas of the small-diameter opening and the large-diameter opening of the molded product are different, a difference occurs in the internal pressure at both openings, and the difference in the internal pressure causes the molded product to open from the large-diameter opening to the small-diameter opening. A force acting toward the side acts, and a reaction force against this force is generated in the nozzle. The reaction force acting on this nozzle is detected by the detection means. The speed of the nozzle is adjusted by controlling the drive source via the control means according to the signal detected by the detection means. Therefore, even if the force acting on the molded product from the large diameter opening toward the small diameter opening varies, the speed of the nozzle can be adjusted so as to synchronize with the force.

[0014]

Embodiments of the present invention shown in the drawings will be described below. 1 to 5 show a first embodiment of a releasing apparatus according to the present invention, FIG. 1 is a schematic view showing the whole, and FIGS. 2 to 5 are explanatory views showing a releasing procedure. is there.

That is, the mold releasing device shown in this embodiment is
A nozzle 1 provided so as to be capable of advancing and retreating in the horizontal direction, and a support member 17 for supporting the nozzle 1 so as to be capable of advancing and retreating 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 that is connected to the nozzle 1 and that detects a reaction force of the molded product 24 that acts on the nozzle 1, a servo motor 15 that is a drive source that advances and retracts the nozzle 1, and the servo motor. CP, which is a control unit that controls the transmission member 10 that transmits the driving force of the nozzle 15 to the nozzle 1 and the direction control valve 5, and that also controls the servomotor 15 in response to a signal from the load cell 8.
It is equipped with U22.

The nozzle 1 has a tubular shape with one end closed, the load cell 8 is attached to the closed one end, and a projection 2 which is annularly projected in the axial direction is integrally formed in the opening. In addition, the outer peripheral surface is formed with a communication hole 3 that communicates the inside and the outside.

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 via 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.
Will be supplied into the gap between the core 23 and the core 23.

A connecting plate 9 is connected to the load cell 8, and the connecting plate 9 includes 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 end of the guide rail 19 of the supporting member 17 is integrally connected to each other, and in this case, the ball screw 11
The guide rail 19 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 is adapted to mesh with a gear 16 of the servomotor 15 mounted on a base 14. Therefore, the servomotor 15
By rotating the nut 12, the nut 12 rotates via both gears 13 and 16, and the ball screw 11 advances and retracts in the horizontal direction according to the rotation of the nut 12, and the ball screw 11 is integrated with the ball screw 11 via the connecting plate 9. The connected load cell 8 and nozzle 1 move forward and backward 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 be moved back and forth in the horizontal direction with respect to the guide bush 18, and by the cooperation of the guide bush 18 and the guide rail 19, The load cell 8 and the nozzle 1 are supported so as to be movable in the horizontal direction.

Reference numeral 20 is a motor driver for amplifying a signal from the servo motor 15, and 21 is a speed controller.

Next, the operation of the above will be described. First, a molded product 2 made of an elastic body such as a rubber-like elastic body having a cylindrical bellows shape whose diameter gradually increases from one end to the other end.
4 is integrally formed on the peripheral surface of the core 23 formed in a shape that matches the inner peripheral surface thereof with an appropriate thickness by vulcanization molding or the like,
This is positioned at an appropriate position on the base 14.

Next, the servomotor 15 is operated to rotate the nut 12 via the gear 16 on the servomotor 15 side and the gear 13 on the nut 12 side of the transmission member 10 to move the ball screw 11 in the direction of the core 23. While moving forward, the load cell 8 and the nozzle 1 are moved forward via the connecting plate 9 so as to follow the ball screw 11, and the projection 2 at the tip of the nozzle 1 is moved to the inner peripheral surface of the molded product 24 and the circumference of the core 23. The molded product 24 is inserted between the molded product 24 and the core 23 from the small-diameter opening 24a side to form an appropriate gap between the molded product 24 and the core 23.

Next, the pressure supply source 7 is activated, and the pipe 6,
Nozzle 1 via directional control valve 5, piping 4 and communication hole 3
Compressed air is supplied to the inside of the nozzle and compressed air is supplied from the tip of the nozzle 1 into the gap.

Thus, the inner peripheral surface of the molded product 24 and the core 2
By supplying compressed air into the gap formed between the peripheral surface of No. 3 and the peripheral surface of 3, the molded product 24 gradually expands and deforms from the small diameter opening 24a side toward the large diameter opening 24b side, and the large diameter opening Compressed air is exhausted from 24b.

In this case, the large-diameter opening 24b of the molded product 24
Since the cross-sectional areas of the small-diameter opening 24a and the small-diameter opening 24a are different from each other, a difference occurs in the internal pressure acting on both the openings 24a and 24b, and 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. The force toward
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 the load cell 8 connected to the nozzle 1, and the signal detected by the load cell 8 is sent to the CPU 22. From this load cell 8. Servo motor 15 via the motor driver 20 according to the signal of
Is controlled, and 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 backward speed of the ball screw 11 is adjusted by the rotation of the nut 12. Become.

Therefore, the retreat speed of the ball screw 11, that is, the retreat 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 such a cause, the force acting on the molded product 24 and the retreat speed of the nozzle 1 are synchronized by detecting the force with the load cell 8 and processing it by the CPU 22. You will be able to

As a result, the small diameter opening 24a of the molded product 24 is formed.
Even if the molded product 24 is not sandwiched, the molded product 24 will not be released from the mold, and the molded product 24 can be reliably released from the peripheral surface of the core 23.

FIG. 6 shows a second mold release apparatus according to the present invention.
In the mold releasing device shown in this embodiment, a cylindrical rupture-preventing cover 25 that covers the periphery of the molded product 24 is integrally provided outside the nozzle 1. The other structure is similar to that shown in the first embodiment.

The mold releasing apparatus of this embodiment also exhibits the same effects as those of the first embodiment, and the large-diameter opening 24b to the small-diameter opening 24a that act on the molded product 24. Since the retreat speed of the ball screw 11, that is, the retreat speed of the nozzle 1 can be adjusted in accordance with the force directed to, even if the force acting on the molded product 24 varies for some reason, the force is applied to the load cell one by one. By detecting in 8 and processing by CPU 22, the force acting on the molded product 24 and the retreat speed of the nozzle 1 can be synchronized.

Therefore, the small diameter opening 24 of the molded product 24 is formed.
Even if b is not sandwiched, the molded product 24 will not be released from the mold, and the molded product 24 can be reliably released from the peripheral surface of the core 23. Further, since the mold releasing device shown in this embodiment is provided with the rupture preventing cover 25 that wraps the periphery of the molded product 24, expansion deformation of the molded product 24 when compressed air is supplied is limited. Therefore, the molded product 24 can be prevented from bursting.

FIG. 7 shows a third mold release apparatus according to the present invention.
In the mold releasing device shown in this embodiment, a three-jaw chuck 26 is integrally provided on the outer side of the nozzle 1, and other structures are shown in the first embodiment. It has the same structure as the one.

The releasing apparatus of this embodiment also exhibits the same operation and effect as those of the first embodiment, and the large-diameter opening 24b to the small-diameter opening 24a that act on the molded product 24. Since the retreat speed of the ball screw 11, that is, the retreat speed of the nozzle 1 can be adjusted in accordance with the force directed to, even if the force acting on the molded product 24 varies for some reason, the force is applied to the load cell one by one. By detecting in 8 and processing by CPU 22, the force acting on the molded product 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 held, the molded product 24 will not be released from the mold, and the molded product 24 can be reliably released from the peripheral surface of the core 23. Further, since the one shown in this embodiment is integrally provided with the three-jaw chuck 26 on the outside of the nozzle 1, the small diameter opening 24a of the molded product 24 is formed.
Thus, the molded product 24 can be more reliably released from the mold.

[0037]

As described above, according to the present invention, the nozzle is inserted between the inner peripheral surface of the molded product and the peripheral surface of the core, and the space between the molded product and the core is inserted through the nozzle. When compressed air is supplied from the pressure supply source to the molded product, the molded product is gradually expanded and deformed 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. in this case,
Since the large-diameter opening and the small-diameter opening of the molded product have different cross-sectional areas, there is a difference in the internal pressure that acts on both openings of the molded product.The difference in the internal pressure causes the molded product to open from the large-diameter opening to the small-diameter opening. A force acting in the direction of the section acts, and a reaction force against this force is generated in the nozzle. Then, 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 back and forth according to the signal from the detection means to adjust the forward / backward speed of the nozzle. Will be done. Therefore, even if the force acting on the molded product from the large-diameter opening portion to the small-diameter opening portion varies for some reason, the advancing / retreating speed of the nozzle can be adjusted so as to be synchronized with the variation. As a result, there is an excellent effect that the molded product can be reliably released from the peripheral surface of the core without causing a release error.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of a releasing apparatus 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 deformation of the molded product.

FIG. 3 is an explanatory view showing a procedure for releasing the mold shown in FIG. 1, and is an explanatory view showing a state of a molded product in an initial stage of expansion and deformation.

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 in the latter stage of expansion deformation.

FIG. 5 is an explanatory diagram showing a procedure for releasing the mold shown in FIG. 1, and is an explanatory diagram showing a state where a molded product is released from the mold.

FIG. 6 is a schematic view showing a second embodiment of the releasing apparatus according to the present invention.

FIG. 7 is a schematic view showing a third embodiment of the releasing apparatus according to the present invention.

FIG. 8 is a schematic view showing a conventional mold releasing device, and an explanatory view showing a positional relationship between the core and the mold releasing device.

FIG. 9 is a schematic view showing a conventional mold releasing device, and an explanatory view showing a state in which an end portion of a core is inserted into an outer jig of the mold releasing device.

FIG. 10 is a schematic view showing a conventional mold releasing device, and an explanatory view showing a state in which a nozzle of the mold releasing device is inserted between a molded product and a core.

FIG. 11 is a schematic view showing a conventional mold releasing device, and an explanatory view showing a state where a molded product is released from the core.

[Explanation of symbols]

 1, 31 ... Nozzle 2 ... Protrusion 3 ... Communication hole 4, 6 ... Piping 5 ... Direction control valve 7 ... Pressure supply source 8 ... Detection means (load cell) 9 ... Connecting plate 10 ... Transmission Member 11 ...... Ball screw 12 ...... Nut 13, 16 ...... Gear 14 ...... Base 15 ...... Drive source (servo motor) 17 ...... Support member 18 ...... Guide bush 19 ...... Guide rail 20 ...... Motor driver 21 ...... Speed controller 22 …… Control means (CPU) 23 …… Core 24 …… Molded product 24 a …… Small diameter opening 24 b …… Large diameter opening 25 …… Cover 26 …… Three claw chuck 30 …… Outside cure Ingredient

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 9, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Reference numeral 20 is a motor driver for amplifying a signal from the servomotor 15, and 21 is a throttle valve (flow rate adjustment).
Valve) .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 1, 31 ... Nozzle 2 ... Protrusion 3 ... Communication hole 4, 6 ... Piping 5 ... Direction control valve 7 ... Pressure supply source 8 ... Detection means (load cell) 9 ... Connection Plate 10 ... Transmission member 11 ... Ball screw 12 ... Nut 13, 16 ... Gear 14 ... Base 15 ... Drive source (servo motor) 17 ... Support member 18 ... Guide bush 19 ... Guide rail 20 ...... Motor driver 21 ...... Throttle valve (flow rate adjusting 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 …… Outer jig

Claims (1)

[Claims] 1. A mold releasing 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), the device being provided so as to be movable back and forth.
At the time of advancing, the front end has a small diameter opening (2) of the molded product (24).
Nozzle (1) which can be inserted between the molded product (24) and the core (23) from the side 4a) and can supply compressed air between them.
And a drive 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 article (24) acting on the nozzle (1).
A mold release characterized by comprising detection means (8) for detecting a reaction force by the detection means, and control means (22) for controlling the drive source (15) according to a signal from the detection means (8). apparatus.