JP3261950B2 - Mold equipment for injection molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die apparatus having at least a pair of orthogonal slide cores, wherein the slide cores are fitted into and recessed from each other.

[0002]

2. Description of the Related Art As an injection mold apparatus having at least a pair of orthogonal slide cores, and having their slide cores fitted in an uneven manner, an apparatus as shown in FIG. 8 is known. ing. A cavity block 103 in which a molded product is formed is fixedly arranged on a movable mold platen 102 of a mold 101. A slide core 104 having a double pipe as a molded product is attached to the cavity block 103 so as to be able to move forward and backward. A protrusion 105 is formed at the center of the slide core 104, and a cylindrical portion 106 is formed so as to cover the protrusion 105. A hole 107 is formed in the cylindrical portion 106 to fit an orthogonal slide core described later.

On the other hand, a slide core 108 that moves in a direction perpendicular to the slide core 104 is disposed at a position perpendicular to the slide core 104. The slide core 108 is connected to a cylinder rod 110 of a hydraulic cylinder 109 fixed to a side surface of the mold device 101. That is, the slide core 108 is operated by the hydraulic cylinder 109, and the other slide cores are operated by the angular pins (not shown).

[0004]

However, in the above-mentioned prior art, a hydraulic cylinder is used for engaging and disengaging the slide cores with each other. Then, a bracket 1 for fixing the hose 111, the joint, and the hydraulic cylinder to the mold apparatus to operate the hydraulic cylinder.
Many parts such as 12 are attached. for that reason,
Not only is the mold device itself expensive, but also the device itself has become large. Further, as described above, since many parts are mounted around the mold apparatus, it takes a lot of time to set and set timings as well as to and from the molding machine.

If the operation timing of the hydraulic cylinder is set incorrectly, not only the slide cores of each other but also the mold itself will be damaged. In addition, a special device for operating the hydraulic cylinder had to be incorporated in the molding machine itself.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and in an injection molding die apparatus in which orthogonal slide cores are integrally fixed at the time of injection molding, each slide core is provided. Has a mechanism in which one of the moving blocks to reach the fixed position arrives earlier than the other orthogonal moving block, and has an uneven portion in which the other orthogonal moving block fits only when moved to the fixed position. It is characterized by the following.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding die apparatus in which orthogonal slide cores are integrally fixed at the time of injection molding, wherein one of the moving blocks for moving each slide core is the other. It has a mechanism to reach the fixed position earlier than the orthogonal moving block, and has an uneven portion where the other orthogonal moving block fits only when it moves to the fixed position, so the mold itself is designed inexpensively and compactly. Since the movement of the slide cores is performed by the mold itself, no special setting is required, and damage to the slide core and the mold itself due to an incorrect setting can be prevented.

[0008]

When the injection molding is completed, the second moving block and the third moving block are moved outward by the angular pins, and the respective slide cores are also removed from the molded product. When returning to the state at the time of injection molding, the first moving block, the second moving block, and the third moving block move inward, respectively, and the first moving block is moved by the resilient member to the third moving block. After being moved and positioned faster, the protrusions of the slide core fit into the holes of the positioned slide core to be integrated. Next, injection molding is performed.

[0009]

EXAMPLES moldings illustrated example is a L-shaped pipe section W, the pipe parts W is in a double pipe (outer pipe section W _1, the inner pipe section W _2). Further, the hole W ₃ is formed on one of the inner pipe section W _2.

FIG. 1 is a cross-sectional view showing the entire mold apparatus, and will be described with reference to FIG. 2 which is a partially enlarged view of FIG.
The mold apparatus 1 is composed of a fixed mold plate (not shown) and a movable mold plate 2. The fixed mold plate allows a moving block, which will be described later, to approach and separate in the front-rear and left-right directions. The angular pin of the book is fixed. The two angular pins are fixed to the four sides of the fixed mold plate in pairs. Also, a half of a cavity block in which a cavity for molding a molded product is formed is attached.

A half of the cavity block 3 is mounted on the movable mold platen 2. The cavity 4 is formed by the half of the cavity block 3 of the movable mold plate 2 and the half of the cavity block of the fixed mold plate facing each other and matching. Reference numeral 5 denotes a runner groove for allowing the resin to flow into the cavity 4.

Two slide cores (an inner slide core 6 and a cylindrical outer slide core 7) forming a pipe (inner pipe W ₂ ) inside the molded article W are provided on one side of the L-shaped molded article W. Are slidably inserted. A through hole 8 is formed in an intermediate portion of the cylindrical outer slide core 7. A slide core that moves in a direction orthogonal to the slide cores 6 and 7 described later fits into the through hole 8. A first moving block 9 is fixed to the rear end of the outer slide core 7, and a second moving block 10 for fixing the rear end of the inner slide core 6 is provided on the back of the first moving block. Are located. The first moving block 9 and the second moving block 10 are urged by a repelling member 11 such as a coil spring so as to repel each other. The second moving block 10 is formed with a hole 12 into which an angular pin of the fixed mold plate is inserted.

At a position perpendicular to the slide cores 6 and 7, a slide core 14 having a projection 13 formed to fit into the hole 8 of the outer slide core 7 is disposed. Also, L
Slide cores 15 and 16 that are overlapped and arranged so that a double pipe can be formed also on the other side of the shaped product W are arranged in parallel with the slide core 14. A third moving block 17 that moves in a direction perpendicular to the first and second moving blocks 9 and 10 is fixed to the ends of the slide cores 14, 15 and 16. Like the second moving block 10, the third moving block 17 has
A hole 18 into which an angular pin of the fixed die plate is inserted is formed. Further, a concave portion 19 is formed on a side surface of the third moving block 17 so as to engage with an end surface of the first moving block 9 and prevent the moving block 9 from moving.

Next, the operation will be described. 1 and 2 are views immediately after the resin flows into the cavity 4 and the molded article W is formed. From this state, the fixed mold plate and the movable mold plate 2 of the mold apparatus 1 are opened. First, the second moving block 10 and the third moving block 17 are connected to the mold apparatus 1 by the angular pins. Each moves outward. Then, these second and third moving blocks 10, 1
By the movement of 7, the inner slide core 6 and the slide cores 14, 15, 16 also move and begin to come off from the molded product W. Here, the protrusion 13 of the slide core 14 also comes out of the hole 8 of the outer slide core 7. However, the end of the first moving block 9 is the third moving block 17.
And the repelling member 11 prevents movement. If the operation of the resilient member 11 is guaranteed over time, there is no need to engage the recess 19 of the third moving block 17 with the first moving block 9. In this embodiment, such a configuration is adopted in consideration of safety.

Further, when the fixed mold platen and the movable mold platen 2 are opened, the first moving block 9 also starts to move toward the outside of the mold apparatus 1 by the stop bolt S (FIG. 3).
Finally, each slide core comes out of the molded product W (see FIG. 4). FIG. 5 shows a state in which the slide core 14 does not move. In such a case, the end of the first moving block 9 is engaged with the concave portion 19 of the third moving block 17. The outer slide core 7 also does not move.

Next, the operation of returning each moving block to the state at the time of injection molding from the above operation will be described. In FIG. 4, the first
Moving block 9 (this first moving block 9 is via a resilient member 11), the second moving block 10 and the third moving block 9.
Of the mold apparatus 1 is moved by an angular pin
Is moved inward. At this time, the first moving block 9 is moved by the elastic member 11 to the third moving block 17.
Move faster. That is, after the outer slide core 7 is positioned, the slide core 14 moves while the protrusion 13
Are fitted in the holes 8. Here, if the repelling member 11 does not operate, the side surface 1 of the third moving block 17
7a contacts the end of the first moving block 9, and the third moving block 17 is stopped (see FIG. 6). In this manner, the positioning of the slide core 14 is
This is prevented from being performed prior to positioning.

The present invention is also effective for molding means as shown in FIG. Moldings are mere pipe sections Y, hole Y ₁ is formed in the middle portion of the pipe component Y. When forming this pipe part Y, a pair of slide cores is an essential requirement in the perpendicular direction. Here it may abut so as to be orthogonal to each other of the slide core, but holes Y ₁
The present invention is utilized so that the slide cores forming the above are not bent by the pressure of the resin, and the slide cores may be fitted to each other.

[0018]

According to the present invention, in an injection molding die apparatus in which orthogonal slide cores are fixed together during injection molding, one of the moving blocks for moving each slide core is perpendicular to the other. It has a mechanism to reach the fixed position earlier than the moving block, and has an uneven part where the other moving block that intersects orthogonally only when it moves to the fixed position is provided, so the mold itself can be designed inexpensively and compactly. ,Also,
Since the mutual movement of the slide core is performed by the mold itself, no special setting is required, and damage to the slide core and the mold itself due to an incorrect setting can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially cut front view when injection molding is completed according to one embodiment of the present invention.

FIG. 2 is an enlarged front view of FIG. 1A.

FIG. 3 is a front view when a first moving block and a second moving block in FIG. 2 are retracted in respective directions.

FIG. 4 is a front view in which first and second moving blocks in FIG. 3 are further retracted.

FIG. 5 is a front view when the slide core of FIG. 1 has not moved.

FIG. 6 is a front view when the elastic member of FIG. 5 does not operate.

FIG. 7 is a front sectional view showing a second injection molding means according to the present invention.

FIG. 8 is a front view of a conventional device.

[Explanation of symbols]

W Pipe parts W ₁ Outer pipe W ₂ Inner pipe 1 Mold device 2 Movable mold plate 3 Cavity block 4 Cavity 6,7 Slide core 8 Through hole 9 First moving block 10 Second moving block 11 Resilient member 12 hole 13 convex portion 14, 15, 16 slide core 17 third moving block 18 hole 19 concave portion

Claims (1)

(57) [Claims] In an injection molding apparatus in which orthogonal slide cores are fixed together during injection molding, one of the moving blocks for moving each slide core is faster than the other orthogonal moving block. An injection molding die apparatus, comprising a mechanism for reaching a fixed position, and provided with a concave and convex portion into which the other moving block orthogonal to only when moved to the fixed position is fitted.