JP2000202848A - Method for releasing waterproofing rubber plug from mold and molding machine for waterproofing rubber plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for releasing a waterproofing rubber plug from a mold for easily releasing the plug and a molding machine for the plug. SOLUTION: A device for releasing a molding from a mold of the molding machine has a pin group 30 having three types of pin groups 30A, 30B and 30C including different heights. When a metal plate is pushed to the groups 30, the groups are sequentially advanced from the highest group 30A into a molding space 13 so that the waterproofing rubber plugs 1 contained in the space 13 are sequentially released from the mold. Thus, when released, a reaction force applied to the plate is dispersed and reduced, and hence the releasing work is facilitated, and a deformation of the plate can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a waterproof rubber plug and a device for forming the waterproof rubber plug.

[0002]

2. Description of the Related Art In FIG. 6, reference numeral 1 denotes a general waterproof rubber stopper, which has a structure in which a lip portion 3 protrudes from the outer peripheral surface of a cylindrical body 2, and has a rubber molding die 10 as shown in FIG. It is manufactured by a molding device 12 including a mold release device 11. The rubber mold 10 is an upper mold 10 that can be opened up and down.
A and a lower mold 10B, and the lower mold 10B has a metal plate 1 in which a plurality of molding spaces 13 for the waterproof rubber stopper 1 are formed.
4 are provided detachably. When the metal plate 14 is detached from the lower mold 10B and is held by the arm 15 provided in the mold release device 11 and pressed against the pin group 30, the waterproof rubber in the molding space 13 is pressed by each pin. The stopper 1 is removed so as to be pushed out.

[0003]

By the way, in the conventional molding apparatus, all the pins constituting the pin group 30 have the same height, and the waterproof rubber plug 1 in the entire molding space 13 is removed at a time. Had a configuration. For this reason, in a metal plate in which many molding spaces 13 are formed, a large force is required at the time of demolding, and the demolding operation is difficult, and the metal plate may be deformed by receiving a large reaction force.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for removing a waterproof rubber plug and a molding apparatus for the waterproof rubber stopper which can easily remove the waterproof rubber stopper. I do.

[0005]

To achieve the above object, a method of removing a waterproof rubber plug according to the present invention is to form a waterproof rubber plug in a plurality of molding spaces formed in a rubber molding die. Then, in the method of removing the waterproof rubber plug by inserting the pins into the molding spaces, the timing at which the pins enter each molding space is shifted so that the waterproof rubber plugs are sequentially removed from the molding space. It has features.

According to a second aspect of the present invention, there is provided an apparatus for forming a waterproof rubber plug, comprising: a metal plate having a plurality of molding spaces formed therein for molding the waterproof rubber stopper; and a pin group including a plurality of pins corresponding to the molding space. In a waterproof rubber stopper molding device for removing a waterproof rubber stopper by pressing a metal plate against a pin group and allowing each pin to enter each molding space,
The feature is that the pins of the pin group are set at uneven heights.

[0007]

According to the first aspect of the present invention, the timing at which the pins enter each molding space is shifted.
The reaction force when the waterproof rubber stopper is removed is dispersed and reduced, and the removing operation can be easily performed.

According to the second aspect of the present invention, when the metal plate is pressed against the pin group, the highest pin of the pin group sequentially enters the molding space, and the waterproof rubber plug is sequentially removed. Thereby, since the reaction force applied to the metal plate at the time of removing the mold is dispersed and reduced, the removing operation is facilitated and the deformation of the metal plate can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. Waterproof rubber stopper 1 of the present embodiment
Is shown in FIG. 6 and has the same structure as that described in the prior art. Specifically, the cylindrical body 2 of the waterproof rubber stopper 1 is
An inner lip 4 is provided on the inner peripheral surface of the inner lip 4 to be tightly attached to the electric wire to be crimped to a terminal fitting (not shown).
Is provided. Further, an outer lip 3 provided on the outer peripheral surface of the cylindrical body 2 can be in close contact with an inner wall of a connector (not shown) in which the terminal fitting is accommodated. The molding device 12 for manufacturing the waterproof rubber plug 1 includes a rubber molding die 10 and a demolding device 11 (see FIG. 1) in the same manner as the conventional one (see FIG. 1). It is different from the conventional one.

The rubber molding die 10 is composed of an upper die 10A and a lower die 10B, which can also be opened up and down. Lower mold 10B
Is provided with a metal plate 14 in a detachable manner, and a plurality of molding spaces 13 are formed through the metal plate 14. The molding space 13 has a cross-sectional shape shown in FIG. 6 and has a groove 17 for forming the outer lip 3 near the lower end.

As shown in FIG. 4, a plurality of molding pins 1 corresponding to the molding space 13 are provided on the upper surface of the lower mold 10B.
8 are projected. Further, the upper die 10A communicates with the nozzle portion 19 (see FIG. 2) and the metal plate 14
A plurality of runner portions 20 corresponding to the molding space 13 are formed. The lower end opening of the runner portion 20 is slightly larger than the outer diameter of the forming pin 18 as shown in FIG.

As shown in FIG. 1, the demolding apparatus 11 is provided with a pair of arms 15 which can hold the both sides of the metal plate 14 and move it up and down.
A pressing portion 16 having a pin group 30 projecting downward is provided on an upper portion of the demolding device 11.
When the metal plate 14 is moved upward, each pin of the pin group 30 enters each molding space 13.

Now, as shown in FIG. 6, the pin group 30
It is composed of three types of pin groups 30A, 30B and 30C having different heights. Of these, the highest first pin group 30A is disposed in a portion of the metal plate 14 shown in FIG. 3 corresponding to the region R1 near the outer periphery of the pin forming portion 14A, and corresponds to the region R2 inside the pin forming portion 14A. The second of intermediate height
A pin group 30B is arranged, and furthermore, an inner region R3
The shortest third pin group 30C is arranged at the portion corresponding to.

Next, the manufacturing procedure of the waterproof rubber plug 1 of the present embodiment will be described by dividing it into a molding step and a demolding step. The molding process is as follows. As shown in FIG. 1, the rubber molding die 10 is opened, and the metal plate 14 is placed on the upper surface of the lower die 10B.
Is set. Then, as shown in FIG.
3, the lower open end is closed by the upper surface of the lower mold 10B, the molding pin 18 provided in the lower mold 10B penetrates the molding space 13, and the tip protrudes upward from the molding space 13. Next, when the rubber mold 10 is closed, the upper mold 1 is closed.
The lower end opening of the runner portion 20 formed at 0A is aligned with the upper end opening of the molding space 13 of the metal plate 14 (see FIG. 4), and the tip end of the molding pin 18 enters the runner portion 20. As a result, the opening edge of the runner portion 20 is
3, the upper open end is entirely closed, and the runner part 20 is communicated with the molding space 13 through a slight gap between the runner part 20 and the molding pin 18 (see FIG. 5).
When the molten rubber is injected in this state, the molten rubber flows from the runner portion 20 into the molding space 13 through the gap and enters the molding space 1.
The waterproof rubber stopper 1 is formed in the inside 3.

The demolding step is as follows. As shown in FIG. 1, the rubber molding die 10 is opened, and the metal plate 14 is opened.
Is detached from the lower mold 10B, and is set on the arms 15, 15 provided in the mold release device 11. When the release device 11 is driven, the arm 15 extends upward, and the metal plate 14 is pressed against the pressing portion 16. Then, FIG.
As shown in FIG. 5, the pins of the highest pin group 30A among the pins 30 provided in the pressing portion 16 enter the molding space 13, and the waterproof rubber plug 1 housed therein is removed. . Further, when the metal plate 14 is pressed against the pressing portion 16, each pin of the second highest pin group 30B enters the molding space 13 as shown in FIG. The stopper 1 is removed. Then, when the metal plate 14 is pressed to the end, as shown in FIG. 8, each pin of the shortest third pin group 30C enters the remaining molding space 13, and the waterproof rubber plug 1 housed therein is removed. Demolded and thus the entire molding space 1 of the metal plate 14
The removal of the waterproof rubber plug 1 contained in the mold 3 is completed.

As described above, in the molding apparatus 12 of the present embodiment, the plurality of waterproof rubber plugs 1 are sequentially removed from the mold, so that a large force is not applied to the metal plate 14 at one time. Such a reaction force is dispersed and reduced. Thereby, the removal work becomes easy, and the deformation of the metal plate 14 can be prevented.

<Other Embodiments> The present invention is not limited to the above embodiments. For example, the following embodiments are also included in the technical scope of the present invention.
In addition to the following, various changes can be made without departing from the scope of the invention.

(1) The pin group 30 of the above embodiment is divided and arranged for each of the three types of pin groups 30A, 30B, and 30C. However, the configuration is such that pins of three types are uniformly distributed. It may be.

(2) In the above embodiment, as shown in FIG. 8, the height difference D1 between the pin groups 30A, 30B and 30C.
Was substantially the same as the thickness dimension H1 of the metal plate 14, but as shown in FIG. 9, the pin groups 30A, 30B, 30
The height difference D2 between C may be equal to or less than the thickness dimension H2 of the metal plate 14. Even with such a configuration, the peak of resistance when removing the waterproof rubber plug 1 is shifted, so that the force applied to the metal plate 14 can be dispersed.

(3) In the above embodiment, the pin group 30
Although the pins are composed of the pin groups 30A, 30B, and 30C, the number of pins may be two or four or more.

[Brief description of the drawings]

FIG. 1 is a perspective view of an apparatus for forming a waterproof rubber plug according to a related art and an embodiment of the present invention.

FIG. 2 is a side view showing a state in which a rubber molding die is closed.

FIG. 3 is a plan view of a metal plate.

FIG. 4 is a partial side sectional view of a rubber molding die.

FIG. 5 is an enlarged side sectional view of a communicating portion between a runner portion and a molding space.

FIG. 6 is a side sectional view showing a state in which a first pin group has a waterproof rubber stopper removed.

FIG. 7 is a side sectional view showing a state in which a second pin group has a waterproof rubber stopper removed.

FIG. 8 is a side sectional view showing a state in which a third pin group has a waterproof rubber stopper removed.

FIG. 9 is a side sectional view showing a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waterproof rubber stopper 12 ... Molding device 13 ... Molding space 14 ... Metal plate 14A ... Pin formation part 16 ... Pressing part 30 ... Pin group 30A, 30B, 30C ... Pin group

Claims (2)

[Claims] 1. A method for forming a waterproof rubber stopper in a plurality of molding spaces formed in a rubber molding die, and then allowing a pin to enter the molding space to release the waterproof rubber stopper, wherein: A method for removing a waterproof rubber plug, characterized in that the waterproof rubber plugs are sequentially removed from the mold by shifting the timing of entering each molding space. 2. A metal plate having a plurality of molding spaces through which a waterproof rubber plug is molded, and a pin group including a plurality of pins corresponding to the molding space, wherein the metal plate is pressed against the pin group. In the waterproof rubber plug forming apparatus for releasing the waterproof rubber plug by pressing each pin into each molding space, the pins of the pin group are set at uneven heights. Waterproof rubber stopper molding equipment.