JPH0518110Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention produces a molded product by sequentially injecting a primary injection material and a secondary injection material into a cavity formed between a pair of opposing molds. This invention relates to a two-color mold for molding.

[Conventional technology]

Conventionally, for example, in an audio cassette half constructed of two colors, two transparent windows 2 and 3 are fitted into an opaque half body 1 in a divided state, as shown in FIG. If you try to mold this with two-color molding when there is a
Molding is not possible unless two injection ports are provided.

[Problem that the invention attempts to solve]

However, if a separate injection port is provided for each of the windows 2 and 3, the number of injection ports increases, and this places restrictions on the temperature adjustment system of the mold when manufacturing the mold. There may be cases where a direct hot runner with good productivity cannot be provided. In addition, an extra runner section unrelated to the product is created, which results in wasted material, and heat is required to heat the extra runner section, which reduces the molding cycle. In addition to being disadvantageous, there is also a problem in that the number of molding machines that can be used is limited.

This invention was made in view of the above circumstances,
The purpose of this is to minimize the number of injection ports when molding two-color molded products, to avoid various restrictions when manufacturing molds, and to avoid the need for unnecessary materials or An object of the present invention is to provide a two-color molding die that does not consume heat and can improve productivity.

[Means for solving problems]

In order to achieve the above object, the present invention has a plurality of movable mold bodies that form a space for filling a secondary injection material in a part of the mold, each movable in the mold release direction of the molded product. A passage mold body for communicating a plurality of spaces formed by these movable mold bodies is provided movably in the mold release direction of the molded product.

[Effect]

In the two-color mold of the present invention, when injecting the primary injection material into the mold, each movable mold body and the channel mold body create a space for filling the secondary injection material. When injecting the secondary injection material, the secondary injection material is closed by moving each movable mold body and the passage mold body in the mold release direction of the molded product. A two-color molded product is formed by forming a space for filling the injection material and a passage connecting these spaces.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

In these figures, the reference numeral 10 is a fixed mold plate, and this fixed mold plate 10 is attached to the runner stripper 1.
1 to a fixed mounting plate 12.
In addition, a movable template 13 is provided opposite to the fixed template 10.
is provided movably, and this movable template 13
are the first, second, and third movable receiving plates 14, 15, 16
and is attached to the movable mounting plate 17 via a spacer block (not shown). Engraved surfaces 10a and 13a for forming the outer surface and inner surface of the cassette half 4 are formed on opposing surfaces of the templates 10 and 13, respectively.
Further, a core back assembly 18 is provided inside the movable mold plate 13, the first and second movable receiving plates 14, 15, and the cassette half (molded product).
4 (vertical direction in FIGS. 1 and 2).

The core bag assembly 18 has first and second movable mold bodies 19 and 20 for molding the two window parts 2 and 3 of the cassette half 4, respectively, and a mold body for communicating these window parts 2 and 3. A passage mold body 21;
First, second and third receivers 22, 23 and 24 supporting these mold bodies 19, 20 and 21 respectively, and between the first and second receivers 22 and 23 and the second and third receivers 2
The connecting pins 25 and 26 connect the connecting pins 3 and 24 at a predetermined distance, respectively. In addition, the first receiver 22 of this core bag assembly 18
is connected to a piston rod 27a of a hydraulic cylinder 27 disposed inside the third movable receiving plate 16, and an oil passage 1 is provided at both ends of the hydraulic cylinder 27.
6a and 16b are connected. Then, when the mold is closed, the piston rod 27 of the hydraulic cylinder 27
By advancing a, the front end surfaces of the first and second movable mold bodies 19 and 20 come into close contact with the fixed mold plate 10, and a space is created between the front end surface of the passage mold body 21 and the fixed mold plate 10. , for primary injection material (half body 1
1), and by retracting the piston rod 27a of the hydraulic cylinder 27, the tip surfaces of the mold bodies 19, 20, 21 are retracted so that the same plane is formed. (See Figure 2).

A pair of locate rings 28 and 29 are attached to the fixed mounting plate 12, and sprue bushes 30 and 31 are inserted through the fixed mounting plate 12 and the runner stripper 11. The sprue bush 30, the fixed mold plate 10, and the movable mold plate 13 are filled with a primary injection material (opaque), respectively, into the cavity formed between the mold plates 10 and 13, and the cassette half A primary injection material passage 32 is formed to be injected from a portion corresponding to the outer surface of 4. Further, the sprue bush 31 and the fixed mold plate 10 are filled with secondary injection material into the gap in the cassette half 4.
A secondary injection material passage 33 is formed to be injected from a portion corresponding to the surface of the window portion 3 .

Furthermore, the third movable receiving plate 16 and the movable mounting plate 1
7, first and second protruding plates 34, 35 are installed movably in the mold release direction of the molded product 4 (vertical direction in FIGS. 1 and 2).
The second protrusion plates 34 and 35 include a protrusion pin 36 for protruding the molded product 4 and a runner protrusion pin 37 for protruding the solidified material in the primary injection material passage 32.
and each of the above-mentioned protruding plates 34, 35 and each protruding pin 3
A return pin 38 for retracting the pins 6 and 37 is respectively attached. A return spring 39 is attached to this return pin 38.

When molding the audio cassette half 4 using the two-color mold configured as described above, the hydraulic cylinder 27 is first pressed at the same time as mold clamping starts.
The piston rod 27a is advanced to move the core back assembly 18 in an integrated state, bringing the front end surfaces of the first and second movable mold bodies 19, 20 into close contact with the engraved surface 10a of the fixed mold plate 10, and closing the passageway. The distance between the distal end surface of the mold body 21 and the engraving surface 10a is maintained at a predetermined value (see FIG. 1). In this state,
The primary injection material injected from the first molding machine (not shown) guided by the locate ring 28 is transferred to the sprue bush 30, the fixed mold plate 10, and the movable mold plate 1.
The space for molding the half body 1 is filled with the primary injection material through a primary injection material passage 32 formed inside the body 3 . As a result, the half body 1 is formed.

Next, when the piston rod 27a of the hydraulic cylinder 27 is moved backward, the first receiver 22 connected to the piston rod 27a and the first movable body 19 attached to the first receiver 22 are moved backward. Subsequently, the second receptacle 23 connected to the first receptacle 22 via the connecting pin 25 and the second movable body 20 attached to the second receptacle 23 are connected to the first and second receptacles. The receivers 22 and 23 are moved back with a predetermined distance between them, and the connecting pin 2 is attached to the second receiver 23.
a third receptor 24 connected via a
The passage mold body 21 attached to the receiver 24 is moved back with a predetermined distance between the second and third receivers 23 and 24. As a result, each mold body 19, 2
The tip surfaces of 0 and 21 are coplanar, and a space for the secondary injection material is formed between these tip surfaces and the engraving surface 10a of the fixed mold plate 10. In this state, the secondary injection material injected from the second molding machine (not shown) guided by the locate ring 29 is applied to the secondary injection material formed inside the sprue bush 31 and the fixed mold plate 10. The space for the secondary injection material is filled via the passage 33. in this case,
The space includes both windows 2 of the cassette half 4,
Spaces 40 and 41 corresponding to 3 and these spaces 4
0 and 41, the secondary injection material flows from the space 41 corresponding to the window 3 through the passage 42 into the space 40 corresponding to the window 2. The windows 2 and 3 are molded in a communicating state inside the half body 1, and as a result, the cassette half 4 is molded in two colors.

[Effect of idea]

As explained above, in the present invention, a plurality of movable mold bodies that form a space for filling the secondary injection material are provided in a part of the mold, each movable in the mold release direction of the molded product. , and the passage mold body for communicating the plurality of spaces formed by these movable mold bodies is provided so as to be movable in the mold release direction of the molded product, so that the primary injected material is not injected into the mold. When injecting, each movable mold body and passage mold body
In addition to closing the spaces for filling the secondary injection material and the passages communicating these spaces, when injecting the secondary injection material, move each movable mold body and passage mold body in the mold release direction of the molded product. The number of injection ports for the secondary injection material is reduced by moving the secondary injection material to form a space for filling the secondary injection material and a passage connecting these spaces to form a two-color molded product. This allows mold manufacturing to be less subject to various restrictions (restrictions on installation of temperature control lines, direct hot runners, etc.), reduces material and heat consumption, and improves productivity. It has the excellent effect of being able to achieve the following.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a cross-sectional view of a mold used for primary molding, and Figure 2 is a cross-sectional view of a mold used for secondary molding. FIG. 3 is a perspective view of the cassette half. 10... fixed template, 13... movable template, 19...
...First movable body, 20... Second movable body, 21...
...Mold body for passage, 40, 41... Space, 42... Passage.

Claims (1)

[Scope of utility model registration request] A two-color molding mold for molding a molded product by sequentially injecting a primary injection material and a secondary injection material into a gap formed between a pair of opposing molds, wherein a part of the mold includes: A plurality of movable mold bodies forming a space for filling with the secondary injection material are provided movably in the mold release direction of the molded product, and the plurality of spaces formed by these movable mold bodies are communicated. A mold for two-color molding, characterized in that a mold body for a passage is provided movably in the mold release direction of the molded product.