JP2745261B2 - Molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method in which a plurality of molded products can be taken out by a set of dies in an assembled state.

[0002]

2. Description of the Related Art In the case of molding and assembling a plurality of molded articles, conventionally, each molded article is molded by a separate mold and then assembled by a robot or the like. That is, FIG. 10 and FIG.
A cover 3 having a hole 3a as shown in FIG.
And a plunger 4 having a locking projection 4a for preventing slippage is formed in a separate mold, and the ejecting pins 5, 5 'are ejected and ejected. Further, as shown in FIG. Was assembled by the person.

[0003]

However, according to the conventional molding method, there are two steps, a molding step and an assembling step, and the operation is complicated, and there is a possibility that an assembly error may occur. The present invention has been made to solve such a problem, and an object of the present invention is to provide a molding method capable of taking out a plurality of molded products in a set of molds in an assembled state.

[0004]

In order to achieve the above object, the present invention comprises a first molded product having a hole, and a locking projection fitted into the hole to prevent the product from falling off. The second molded product is taken out in an assembled state by a set of molds, wherein the molding cavity of the second molded product is equivalent to a hole of the molding cavity of the first molded product. And a gate for each cavity,
Providing a protruding pin at a position corresponding to the locking protrusion of the second molded product, filling the molding cavity of the first molded product with resin, and lowering the protruding pin to lock the protrusion of the second molded product. Forming a space for filling, filling the molding cavity of the second molded product with resin, and removing the first and second molded products from the mold in an assembled state by pushing up a protruding pin after opening the mold. It is characterized by comprising.

[0005]

According to the present invention, in the present invention, the injection molding time is shifted in one set of molds, so that the first molded article having the hole is provided with a locking projection for preventing the hole from coming off. The second molded product can be taken out in a fitted state. For this purpose, the molding cavity of the second molded product is arranged at a position corresponding to the hole of the molding cavity of the first molded product. A gate is provided in each cavity, and a protrusion pin is provided at a position corresponding to the locking protrusion of the second molded product.
Then, after filling the resin into the molding cavity of the first molded product, a projecting pin provided at a position corresponding to the locking projection of the second molded product is lowered to form a space for the locking projection, Subsequently, resin is filled into the molding cavity of this second molded product,
By pushing up the protruding pin after the completion of molding, the first and second molded products can be removed from the mold in an assembled state.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. The same or corresponding members are denoted by the same reference numerals and described.

(Embodiment 1) FIG. 1 shows the configuration of a mold used in the method of this embodiment. This mold has a fixed mold section 10 and a movable mold section 20. FIG. 2 shows a state in which the cover 3 having the hole 3a and the plunger 4 fitted with the hole 3a and having a locking projection 4a for preventing the falling-off are assembled.
In FIG. 1, a plunger cavity 40 is formed at a position corresponding to a hole of the cover cavity 30, and gates 1 and 2 are provided in these cavities 30 and 40, respectively.
A locking projection 4 for preventing the plunger 4 from slipping off.
A protruding pin 5 is provided at a position corresponding to a.

Next, the steps of the method of this embodiment will be described. First, as shown in FIG.
And the cover 3 is molded first. in this case,
As shown in FIG. 3B, a gap is provided between the cavities 30 and 40. Subsequently, the plunger 4 is formed.
As described above, a space (4a) for the locking projection of the plunger 4 is formed with the projection pin 5 slightly lowered. And
The cavity 40 is filled with resin from the gate 2. At this time, the protruding pin 5 is in the protruding plate,
It can be activated by directly connecting the plate with the machine.

As shown in FIG. 5, after the molding is completed, the movable mold 20 is moved with respect to the fixed mold 10 to push up the protruding pin 5, and the cover 3 and the plunger 4 are simultaneously assembled. Take out the product. In this case, since the gap between the hole 3a of the cover 3 and the outer periphery of the plunger 4 is provided by a mold, the cover 3 can be slid up and down.

(Embodiment 2) FIG. 6 shows the configuration of a mold used in the method of this embodiment, and a cover 3 having a hole 3a,
The molding of the plunger 4 fitted into the hole 3a in an assembled state is the same as in the first embodiment. In FIG. 6, a plunger cavity 40 is formed at a position corresponding to the hole of the cover cavity 30, and each of these cavities 3 is formed.
Gates 1 and 2 are provided at 0 and 40, respectively. In addition, the core 6 in the central part which forms the cavity 40 for plungers is
It is constantly pushed upward by the urging pressure of the coil spring 7.

Next, the steps of the method of this embodiment will be described. First, as shown in FIG.
And the cover 3 is molded first. in this case,
As shown in FIG. 7B, the peripheral wall of the core 6 receives the injection pressure. Subsequently, the plunger 4 is molded. As shown in FIG. 8, by filling the cavity 40 with resin from the gate 2, the injection pressure lowers the core 6 downward. At this time, the protruding pin 5 is also mechanically lowered at the same time. However, when the protruding pin 5 is slightly lowered, a space is created.

As shown in FIG. 9, after the molding is completed, the movable mold 20 is moved with respect to the fixed mold 10 to push up the protruding pin 5, and the cover 3 and the plunger 4 are simultaneously assembled. Take out the product. The core 6 returns to the original position by the restoring force of the coil spring 7. Unlike the first embodiment, there is no gap between the cover 3 and the plunger 4 in the product made by this embodiment.

[0013]

As described above, according to the present invention, the molding cavity of the second molded product is arranged at a position corresponding to the hole of the molding cavity of the first molded product, and a gate is provided in each cavity. Providing a protruding pin at a position corresponding to the locking protrusion of the second molded product, filling the molding cavity of the first molded product with resin, and lowering the protruding pin to lock the protrusion of the second molded product. Forming a space for filling and filling the molding cavity of the second molded product with resin, and removing the first and second molded products from the mold in an assembled state by pushing up a protruding pin after opening the mold. Accordingly, a plurality of molded products can be taken out in an assembled state in one set of dies, and therefore, the assembling process can be simplified.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a mold according to a first embodiment.

FIG. 2 is a diagram showing an assembled state of a molded product.

FIG. 3A is a view showing a molded state of a cover,
(B) is an enlarged view of the portion A.

FIG. 4 is a diagram showing a molding state of a plunger.

FIG. 5 is a view showing a state in which a molded product is taken out.

FIG. 6 is a diagram illustrating a configuration of a mold according to a second embodiment.

FIG. 7A is a view showing a molded state of a cover,
(B) is an enlarged view of the portion B.

FIG. 8 is a view showing a molding state of a plunger.

FIG. 9 is a view showing a state in which a molded product is taken out.

FIG. 10 is a diagram showing a cover forming method according to a conventional example.

FIG. 11 is a view showing a method of forming a plunger according to a conventional example.

FIG. 12 is a view showing a method of assembling a molded product according to a conventional example.

[Explanation of symbols]

 1, 2 Gate 3 Cover 3a Hole 4 Plunger 4a Locking protrusion 5 Protruding pin 6 Core 7 Coil spring 10 Fixed side mold section 20 Movable side mold section 30, 40 Cavity

Claims (1)

(57) [Claims] 1. A first molded article having a hole and a second molded article fitted into the hole and provided with a locking projection for preventing a drop are assembled by a set of dies. In a molding method capable of being taken out in a state, a molding cavity of the second molded product is arranged at a position corresponding to a hole of the molding cavity of the first molded product, and a gate is provided in each cavity, and a second Providing a protruding pin at a position corresponding to the locking projection of the molded product, filling the molding cavity of the first molded product with resin, and lowering the protruding pin to reduce the space for the locking projection of the second molded product. Forming and filling the molding cavity of the second molded product with a resin, and removing the first and second molded products from the mold in an assembled state by pushing up a protruding pin after opening the mold. Characteristic molding method.