JPH0343226A - Mold for injection molding for cassette half - Google Patents

Abstract

PURPOSE:To separate a molded product at a gate section from solidified resin in a resin storage smoothly by providing a knockout mechanism for releasing a cassette half from a mold and a knockout mechanism for releasing the resin storage from the mold and installing a spring component for energizing the both in the separating direction. CONSTITUTION:When a space between a fixed template l and a movable template 2 is opened, a product is moved together with the movable template 2 while adhering to the movable side template 2 side. Knockout plates 19-21 are pushed to the fixed template 1 to knock out a knockout pin 17 from a moving core 12 and release the product out of the movable template 2. A space is formed between the knockout plate 21 and a movable component 26, and also another space is formed between the end of a cylindrical pin 27 and first cylindrical body 4, and as movable components 25 and 26 are energized on the side of movable mounting plate 22 to the knockout plate 19 by a spring 26, the movable components 25 and 26 and the cylindrical bodies 4 and 9 are not moved followingly, irrespective of the movement of the knockout plates 19-21 and the cylindrical pin 27. The resin in a gate section 7 and a resin storage 8 adheres to the cylindrical bodies 4 and 9 and a supporting pin 10 and remain thereon, while the product and solidified resin are separated smoothly at the gate 7.

Description

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

[Conventional technology]

Generally, when injection molding this type of audio cassette half, the air flow inside the cavity mold is placed between the cavity mold forming the outer surface of the cassette half and the core mold forming the inner surface of the cassette half. The product is molded by supplying the molten resin through the gate.

[Problem to be solved by the invention]

However, in this case, if the gate is located in the cavity mold corresponding to the outer surface of the cassette half, there is a problem in that the gate marks remain on the outer surface of the molded cassette half, resulting in poor appearance.

It is desirable to select a gate (device) that has no functional problems.

Furthermore, it is required that the molded product and the solidified resin in the resin passage can be easily separated during mold release.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent gate marks from remaining on the outer surface of the cassette half, to cause no problems in terms of appearance or functionality, and to prevent separation of the cassette halves. To provide an injection mold for a cassette half in which the molded product and the solidified resin in the resin passage can be easily separated during molding, and the gate portion can be smoothly cut.

[Means to solve the problem]

In order to achieve the above object, the injection mold of the present invention has the following features:
A resin injection port is provided in a part of the mold corresponding to the back side of the through-hole portion of the cassette half, and a resin reservoir communicating with the resin injection port is provided in a part of the mold corresponding to the inside of the through-hole of the cassette half; and a first protrusion vA mechanism for releasing the cassette half from the mold, and a second protrusion mechanism for releasing the resin reservoir from the mold after the operation of the first protrusion mechanism. At the same time, an elastic member is provided between both the protruding mechanisms to bias them in a direction to separate them.

[Effect]

In the cassette half injection mold of the present invention, the cassette half The gate marks remaining on the through-hole are located on the back side of the through-hole so that the gate marks are not visible from the outside, and when the cassette half is released from the mold by the first protruding mechanism, the resilient member preventing the second protrusion mechanism from interlocking with the first protrusion mechanism;
After the cassette half (molded product) is ejected, the solidified resin in the resin reservoir is pushed out to smoothly separate the molded product at the gate from the solidified resin in the resin reservoir.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 11.

In these figures, reference numeral 1 denotes a fixed mold plate, and a movable mold plate 2 is provided opposite to this fixed mold plate 2 so as to be openable and closable. A cavity 3 in the shape of a molded product (cassette half) is formed between these templates 1.2. The fixed mold plate 1 is fixed to the fixed mounting plate via a receiving plate, and the movable mold plate 2 is fixed to the movable mounting plate via the receiving plate.

A first cylindrical mold body 4 is disposed inside the movable mold plate 2 corresponding to the back surface of the reel shaft insertion hole (through hole) of the cassette half. In addition, a concave curved surface 5 having a tongue-like shape in plan view is formed in a part of this 'Jl cylindrical mold body 4, and a cavity 3 is formed in the fixed mold plate l opposite to this concave curved surface 5. An inclined groove portion 6 is formed which slopes upward as it approaches.

As shown in FIG. 10, this inclined groove portion 6 is formed in a shape where the groove width becomes narrower as it approaches the cavity 3.
The end of the space formed by the concave curved surface 5 and the inclined groove portion 6 on the cavity 3 side is a gate 7 .

This gate 7 also has a circular resin reservoir (resin passage) 8.
is communicated with. Furthermore, the lower surface of the resin reservoir 8 is
a second cylindrical mold body 9 disposed inside the first cylindrical mold body 4;
The upper surface of the resin reservoir 8 is formed by a support pin 10 disposed inside the second cylindrical mold body 9, and the upper surface of the resin reservoir 8 is opposed to the center of the face by a fixed mold plate l. A resin passage 11 is formed in. Furthermore, the upper part of the support pin IO is formed in a convex shape, and the upper inner side of the second cylindrical mold body 9 is cut out in an annular shape.

The movable mold plate 2 is provided with a movable core 12 that closes the secondary injection material filling space of the cavity 3 so as to be freely retractable into the cavity 3 (moveable in the mold opening direction). The movable core 12 passes through the movable template 2 and the first receiving plate 13 to which the movable template 2 is fixed, and is connected to the movable receiving plate 15, 16 in the second receiving plate I4. The movable core 12 is moved into and out of the cavity 3 via the movable receiving plates 15 and 16 by a hydraulic cylinder (not shown).

Also, when the mold is opened, the protruding pin 17 does not protrude the product inside the cavity 3, and the movable core 12. It is connected to the projecting plate 19.20.21 via the movable receiving plate 15.16 and the third receiving plate 18. This protruding board! 9.20.21 is attached to the third receiving plate I8 and the movable attachment temporary 2.

Further, the support bin 10 includes the moving core 12, the moving receiving plate 15.16, the third receiving plate 18, and the protruding plate 19.20.2.
1 and fixed to the movable mounting plate 22.
It is attached to 3.24. Then, the first . The second cylindrical body 4.9 passes through the movable core 12, the movable receiving plate +5°16, the third receiving plate 18, and the protruding plate 19.20, and is attached to the movable member 25.26 in the protruding plate 21. It is being These movable members 25 and 26 are supported by the distal end surface of the support member 23, and are connected to the protrusion plate 20,
It is provided so as to be movable within a predetermined distance in the mold opening direction within a space defined by a recess formed in the protrusion plate 21. Further, around the first cylindrical mold body 4, a cylindrical pin 27 is arranged such that the movable core 12, the movable receiving plates 15, 16, and the third
Receiving board! 8 and is fixed to the protruding plate 19.20.

Furthermore, a spring 28 is installed between the protrusion tfi, 19 and the movable member 26 to bias them in a direction to separate them.

When molding a cassette half using the injection mold configured as described above, in a clamped state in which the fixed mold plate 1 and the movable mold plate 2 are aligned, the movable receiving plate is moved by a hydraulic cylinder (not shown). The movable core 12 is made to protrude toward the fixed mold plate 1 through the angles 15 and 16, and after closing the secondary injection material filling space, molten resin is supplied through the resin passage 11 of the fixed mold plate 1. As a result, the molten resin enters the resin reservoir 8 through the resin passage 11, and is filled from the resin reservoir 8 through the gate 7 into the primary injection material filling space of the cavity 3.

Next, with the movable core 12 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 l. 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 molded in two colors.

Next, after cooling the inside of the cavity 3 and forming the product,
Open the mold and take out the product. In this case, first, when the fixed mold plate 1 and the movable mold plate 2 are opened, the product moves together with the movable mold plate 2 while remaining attached to the movable mold plate 2 side. Next, protruding plate 1
By extruding the products 9, 20, and 21 onto the fixed mold plate l, the protruding pin 17 first protrudes from the movable core 12 and releases the product from the movable mold plate 2. At this time, a gap is formed between the protrusion [2+ and the movable member 26, a gap is also formed between the tip of the cylindrical bottle 27 and the first cylindrical mold body 4, and the spring 28, the movable members 25, 26 are biased toward the movable mounting plate 22 with respect to the protruding plate 19.
Regardless of the movement of the movable members 25, 26 and the first . The second cylindrical body 4.9 does not move together.

As a result, the resin in the gate 7 portion and the resin reservoir 8 is the same as that in the first portion.
The adhesive I2 remains on the second cylindrical mold body 4.9 and the support pin 10, and the product and other solidified resin are smoothly separated at the gate 7.

Further, the protruding plates 19, 20, 21 move, and the protruding plates 2
1 comes into contact with the movable member 26, the protruding plate 19.20.2
1 and the movable members 25, 26 move, thereby
1st. The second cylindrical mold bodies 4 and 9 protrude from the movable core 12 to release the resin reservoir 8 from the mold, and are removed from the mold by suction with a suction cup.

〔Effect of the invention〕

As explained above, the injection mold for the cassette half of the present invention has a resin injection port provided in the part of the mold corresponding to the back side of the through-hole portion of the cassette half, and a resin reservoir communicating with the resin injection port. A first ejecting mechanism is provided at a part of the mold corresponding to the inside of the through hole of the cassette half and releases the cassette half from the mold; Since the mold is equipped with a second protruding mechanism for releasing the pool from the mold, and a Type 7 springing member is provided between the two protruding rock structures to bias them in a direction to separate them, the cassette Lf of the mold corresponding to the back side of the through-hole part of the half: Penetrate the gate mark left on the cassette half by feeding molten fi F''= into the cavity using the resin injection port provided at Lf:jl. It is positioned on the back side of the hole so that the game mark is not visible from the outside, and when the first protruding mechanism releases the cassette half from the mold, the second protruding member
By preventing the ejection mechanism from interlocking with the first ejection mechanism and ejecting the solidified rosin in the resin reservoir after the cassette half (molded product) has been ejected, the molded product at the gate part and the resin in the resin reservoir are Separation from the solidified resin can be performed smoothly.

[Brief explanation of drawings]

1 to 11 show an embodiment of the present invention, in which FIG. 1 is a sectional view of the resin reservoir, FIG. 2 is a partially sectional side view, and FIG. 3 is a bottom view. Figure 4 is a detailed view of the resin reservoir, Figure 5 is a detailed view of the gate, and Figures 6 to 10.
The figures show the window insert part of the fixed mold board, and Fig. 6 is a front view, Fig. 7 is a side view, Fig. 8 is a cross-sectional view, and Fig. 9 is a bottom view.
FIG. 1O is a detailed view of the inclined groove portion, and FIG. 11 is a sectional view illustrating the protruding mechanism portion. l...Fixed template, 2...Movable template, 3...Cavity, 4...No.! Cylindrical body, 7... Gate (resin injection port), 8... Resin reservoir (resin passage), 9... Second
Cylindrical body, 17... Protrusion pin, 19, 20.21...
- Projection plate, 25. 26... Movable member, 28... Spring (elastic member).

Claims (1)

[Claims] In an injection mold for a cassette half in which a cavity is formed between the molds and a molten resin is supplied into the cavity to injection mold the cassette half, a part of the mold corresponding to the back side of the through-hole portion of the cassette half. a resin injection port is provided in the mold, a resin reservoir communicating with the resin injection port is provided in a part of the mold corresponding to the inside of the through hole of the cassette half, and a first protrusion for releasing the cassette half from the mold. The mold is provided with a mechanism and a second protrusion mechanism that releases the resin reservoir from the mold with a delay from the operation of the first protrusion mechanism, and a second protrusion mechanism is provided between the two protrusion mechanisms in a direction to separate them. An injection mold for a cassette half, characterized by being provided with a resilient member.