JP2718194B2 - Cassette half injection mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention mainly relates to a cassette half injection molding die for molding an audio cassette half by an injection molding method.

[Conventional technology]

Generally, when this type of audio cassette half is injection-molded, the audio cassette half is circulated in the cavity between the mold forming the outer surface of the cassette half and the core forming the inner surface of the cassette half. The molten resin is supplied through a gate to form a product.

[Problems to be solved by the invention]

By the way, in this case, if the position of the gate is provided in the mold corresponding to the outer surface of the cassette half, there is a problem that a gate mark remains on the outer surface of the formed cassette half and the appearance is poor, and there is a problem in appearance. It is desired to select a gate position that has no problem in function. Further, there is a demand for easy separation of the molded product and the solidified resin in the resin passage at the time of release.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent a gate mark from remaining on the outer surface of a cassette half, causing no problem in appearance and function, and further improving the distance. An object of the present invention is to provide an injection mold for a cassette half in which a molded product and a solidified resin in a resin passage at the time of a mold can be easily separated and a gate portion can be cut smoothly.

[Means for solving the problem]

In order to achieve the above object, the injection molding die of the present invention is provided with a resin injection port at a part of the die corresponding to the rear side end surface of the annular portion protruding to the rear side of the through hole of the cassette half, A resin reservoir communicating with the resin injection port is provided at a mold portion corresponding to the inside of the through hole of the cassette half,
The mold includes a first projecting mechanism for releasing the cassette half from the mold, and a second projecting mechanism for releasing the resin reservoir from the mold with a delay from the operation of the first projecting mechanism. In addition, a resilient member is provided between the two protruding mechanisms to urge the two in a direction to separate them.

[Action]

In the injection mold of the cassette half of the present invention,
Gate traces remaining in the cassette half by supplying molten resin into the cavity by the resin injection port provided in the mold portion corresponding to the back side end surface of the annular portion protruding to the back side of the through hole of the cassette half When the cassette half is released from the mold by the first projection mechanism, the Is
The resilient member prevents the second protruding mechanism from interlocking with the first protruding mechanism, and after the cassette half (molded product) is protruded, the solidified resin in the resin pool is protruded to form the gate portion. The product and the solidified resin in the resin pool are separated smoothly.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 11.

In these figures, reference numeral 1 denotes a fixed mold plate, and a movable mold plate 2 is provided so as to open and close to face the fixed mold plate 1. A cavity 3 in the form of a molded product (cassette half) is formed between the mold plates 1 and 2. The fixed mold plate 1 is fixed to a fixed mounting plate via a receiving plate, and the movable mold plate 2 is fixed to a movable mounting plate via a receiving plate.

The first half corresponding to the back side end face of the annular portion protruding to the back side of the reel shaft insertion hole (through hole) of the cassette half.
A tubular mold 4 is arranged inside the movable mold plate 2.
A tongue-shaped concave curved surface 5 is formed in a part of the first cylindrical mold body 4, and the fixed mold plate 1 is opposed to the concave curved surface 5 so as to approach the cavity 3. An inclined groove 6 that is inclined upward is formed. This inclined groove portion 6
As shown in FIG. 10, the groove width is narrowed toward the cavity 3 so that the groove width becomes narrower. The cavity 3 side end of the space formed by the concave curved surface 5 and the inclined groove 6 is connected to the gate 7. Have been. The gate 7 is communicated with a circular resin reservoir (resin passage) 8. Further, the lower surface of the resin reservoir 8 has a second cylindrical mold 9 disposed inside the first cylindrical mold 4 and a support pin 10 disposed inside the second cylindrical mold 9. And the upper surface of the resin reservoir 8 is formed by the fixed mold plate 1. A resin passage 11 is formed in the fixed mold plate 1 so as to face the center of the upper surface of the resin reservoir 8. Furthermore,
The upper part of the support pin 10 is formed in a convex shape, and the inside of the upper part of the second cylindrical mold body 9 is cut off in an annular shape.

The movable mold plate 2 is provided with a movable core 12 for closing the space for filling the secondary injection material of the cavity 3 so as to be able to move in and out of the cavity 3 (movably in the mold opening direction). The movable core 12 penetrates the movable plate 2 and the first receiving plate 13 to which the movable plate 2 is fixed.
The moving cores 12 are connected to the inner moving receiving plates 15 and 16, and the moving core 12 projects into and out of the cavity 3 via the moving receiving plates 15 and 16 by a hydraulic cylinder (not shown).

When the mold is opened, the projecting pin 17 for projecting the product in the cavity 3 is provided with the moving core 12, the moving receiving plates 15, 16 and the third receiving plate.
Through 18, they are connected to the protruding plates 19, 20, 21. The protruding plates 19, 20, and 21 are provided in a space between the third receiving plate 18 and the movable mounting plate 22 so as to be movable in the mold opening direction.

Further, the support pin 10 penetrates through the moving core 12, the moving receiving plates 15, 16, the third receiving plate 18, the projecting plates 19, 20, 21 and the supporting members 23 fixed to the movable mounting plate 22, Installed on 24. Then, the first and second cylindrical mold bodies 4, around the support pin 10,
Reference numeral 9 denotes a moving core 12, moving receiving plates 15, 16, a third receiving plate 18, and a protruding plate.
It penetrates through 19 and 20, and is attached to movable members 25 and 26 in the projecting plate 21. These movable members 25 and 26 are
3 and is supported by the protruding plate 20 and the protruding plate 21.
In the space defined by the recess formed in the mold opening direction within a predetermined distance. Further, a cylindrical pin 27 is provided around the first cylindrical mold body 4.
However, they penetrate the moving core 12, the moving receiving plates 15, 16 and the third receiving plate 18, and are fixed to the protruding plates 19, 20. Further, a spring 28 is mounted between the protruding plate 19 and the movable member 26 so as to urge the two in a direction to separate them.

When the cassette half is molded using the injection mold having the above-described configuration, the fixed mold plate 1 and the movable mold plate 2
After the movable core 12 is protruded toward the fixed mold plate 1 side by the hydraulic cylinder (not shown) via the movable receiving plates 15 and 16 in the mold clamping state in which the secondary injection material filling space is closed, the fixed mold is closed. The molten resin is supplied through the resin passage 11 of the plate 1. As a result, the molten resin enters the resin reservoir 8 via the resin passage 11, and is filled from the resin reservoir 8 via the gate 7 into the space for filling the primary injection material of the cavity 3.

Next, in a state where the movable core 12 is returned into the movable mold plate 2, the molten resin for secondary injection is supplied into the cavity 3 through a resin passage (not shown) formed in the fixed mold plate 1. As a result, the space created by retracting the movable core 12 into the movable mold plate 2 is filled with the molten resin for secondary injection, and as a result, the cassette half is formed in two colors.

Next, after cooling the inside of the cavity 3 to form a product, the mold is opened and the product is taken out. In this case, first, when the space between the solid mold 1 and the movable mold 2 is opened, the product moves together with the movable mold 2 while adhering to the movable mold 2 side. Subsequently, by extruding the protruding plates 19, 20, 21 into the fixed mold plate 1, first,
The protruding pin 17 protrudes from the movable core 12 to move the product to the movable mold plate 2.
Release from mold. At this time, a gap is formed between the protruding plate 21 and the movable member 26, a gap is also formed between the tip of the cylindrical pin 27 and the first cylindrical mold 4, and a spring is formed. 28, the movable members 25, 26
Are urged toward the movable mounting plate 22, the projecting plates 19, 20,
Regardless of the movement of 21 and the cylindrical pin 27, the movable members 25, 26
In addition, the first and second cylindrical members 4, 9 do not move.

As a result, the resin in the gate 7 and the resin in the pool 8 is
The product remains on the second cylindrical molds 4, 9 and the support pins 10, and is separated from the solidified resin at the gate 7 smoothly.

Further, when the protruding plates 19, 20, 21 move and the protruding plate 21 comes into contact with the movable member 26,
25 and 26 move, whereby the first and second cylindrical mold bodies 4 and 9 protrude from the moving core 12 to release the resin in the resin pool 8, and are sucked by the suction cup and removed from the mold. .

〔The invention's effect〕

As described above, the injection molding die of the cassette half of the present invention is provided with the resin injection port at the part of the die corresponding to the back side end surface of the annular portion protruding to the back side of the through hole of the cassette half. A first protruding mechanism for providing a resin reservoir communicating with the resin inlet at a portion of the mold corresponding to the inside of the through hole of the cassette half, and releasing the cassette half from the mold; A second projecting mechanism for releasing the resin reservoir from the mold with a delay from the operation of the projecting mechanism of the mold, and a resilient member for urging the two projecting mechanisms in the direction of separating them from each other. Since the molten resin is supplied into the cavity by a resin injection port provided at a mold portion corresponding to the back surface side end surface of the annular portion protruding to the back surface side of the through hole portion of the cassette half because it is provided. , Cassette half The remaining gate mark is located on the back side end surface of the annular portion protruding to the back side of the through hole, so that the gate mark cannot be seen from outside, and the cassette half is released from the mold by the first protrusion mechanism. In this case, the resilient member prevents the second protruding mechanism from interlocking with the first protruding mechanism, and after the cassette half (molded product) is protruded, protrudes the solidified resin in the resin pool, It is possible to smoothly separate the molded product and the solidified resin in the resin reservoir at the gate portion.

[Brief description of the drawings]

1 to 11 show an embodiment of the present invention.
1 is a cross-sectional view of the resin reservoir, FIG. 2 is a side view of a portion of the resin reservoir, FIG. 3 is a bottom view, FIG. 4 is a detailed view of the resin reservoir, and FIG. FIGS. 6 to 10 show the window nesting portion of the fixed mold plate. FIG. 6 is a front view, FIG. 7 is a side view, FIG. 8 is a sectional view, and FIG. , Tenth
The figure is a detailed view of the inclined groove, and FIG. 11 is a sectional view for explaining the projecting mechanism. 1 ... fixed mold plate, 2 ... movable mold plate, 3 ... cavity,
4... First cylindrical mold, 7... Gate (resin injection port), 8
... Resin pool (resin passage), 9 ... Second cylindrical mold, 17 ...
... projecting pins, 19, 20, 21 ... projecting plates, 25, 26 ... movable members, 28 ... springs (spring members).

Claims (1)

(57) [Claims] 1. A cassette half injection molding die for forming a cavity between molds and supplying a molten resin into the cavity to injection mold the cassette half, wherein a back surface of a through hole of the cassette half is provided. A resin injection port is provided at a portion of the mold corresponding to the back side end surface of the projecting annular portion, and a resin reservoir communicating with the resin injection port is provided at a portion of the mold corresponding to the inside of the through hole of the cassette half. ,
A mold provided with a first projecting mechanism for separating the cassette half from the mold, and a second projecting mechanism for separating the resin reservoir from the mold with a delay from the operation of the first projecting mechanism; An injection molding die for a cassette half, comprising a resilient member for urging the two projection mechanisms in a direction for separating them from each other.