JPH0794136B2 - Multi-material molding method and multi-material molding die - Google Patents

Description

The present invention relates to a multi-material molding method and a multi-material molding die used for the same, and is used for, for example, molding shift boots of automobiles. It is something.

(Prior Art) As a conventional multi-material molding method such as a multi-color molding method and a multi-material molding die, for example, there is one described in JP-A-57-203531.

The multi-material molding die described in FIGS. 1 and 2 of the publication is
The fixed mold is provided with a first fixed insert and a second fixed insert, and the rotatable movable mold is provided with a first movable insert and a second movable insert of the same shape. . Then, the fixed mold and the movable mold are closed to mold the first molded product in the first cavity formed between the first fixed insert and the movable insert, and then the first mold is formed. The mold is opened with the molded product left on the movable mold side, the movable mold is rotated by 180 °, and then the mold is closed again to form the first molded product formed between the second fixed insert, the movable insert and the first molded product. The second molded product is molded in the second cavity.

In addition, the multi-material molding dies shown in FIGS. 3 and 4 of the above publication are a fixed die having a fixed insert and a movable die having a movable insert, and slide in the opening and closing directions of the fixed die and the movable die. It has a structure in which a stationary slide insert that moves and a movable slide insert are provided. Then, in the mold closed state, a part of the space between the fixed insert and the movable insert is closed by the slide insert to form between the fixed insert, the movable insert and the slide insert. A first molded product is molded in the first cavity, and then both slide inserts are slid to form a second mold in a second cavity formed between these slide inserts and the first molded product. I am trying to mold a molded product.

By the way, in the multi-material molded product molded in this way, the separation of a plurality of integrated molded products becomes a problem. In order to prevent this separation, it is conceivable to form a winding part having a shape of being wound around the edge of another molded product on one molded product. However, in the former multi-material molding die and multi-material molding method of the related art, the fixed mold and the movable mold are simply opened and closed, and in the latter one, the slide insert has a fixed mold and a movable mold. Since it slides only in the same direction as the opening / closing direction, it is impossible to form the above-mentioned winding portion.

(Problems to be Solved by the Invention) As described above, in the conventional multi-material molding method and multi-material molding die, since the cavity surface only moves in one direction,
There is a problem in that the winding portion for preventing separation cannot be formed.

The present invention is intended to solve such a problem, and prevents a molded article from being separated from another molded article by forming a rolled-up portion on another molded article in one molded article of a multi-material molded article. The purpose is to form the part with an easy and simple mold structure.

[Structure of Invention]

(Means for Solving the Problem) In the multi-material molding method of the present invention, when a plurality of molded products 2 and 3 made of different materials are integrally molded, one molded product 3 is rolled into another molded product 2. In forming the winding portion 7 that prevents the molded products 2 and 3 from coming off, first, the movable die
21 and a slide core 22 slidably provided on the movable mold 21 and a first fixed mold 23 to close the mold to form a first cavity.
25, and the first molded product 2 is molded in the first cavity 25, and then the movable mold 21 and the slide core 22 are left with the first molded product 2 left. And the first fixed die 23 are opened, and then the slide core 22 is slid in the direction in which the edge portion of the first molded product 2 is released from the mold, and the movable die 21 and the slide core. 22 and the second fixed die 24 are closed to form a second cavity 26 having a portion around the boundary between the slide core 22 and the second fixed die 24 around the first molded product 2. The second molded product 3 is formed in the second cavity 26 formed.

Further, the multi-material molding die of the present invention is used in the multi-material molding method described above, and includes a movable mold 21, a slide core 22 slidably provided on the movable mold 21, and a movable mold
21 and the slide core 22 are opened and closed so that the first molded product 2 is formed between the movable mold 21 and the slide core 22.
The first fixed mold 23 forming the first cavity 25 in which the mold is molded, and the movable mold 21 and the slide core 22 are opened and closed so that the movable mold 21, the slide core 22 and the first mold are closed.
The second fixed mold 24 forming a second cavity 26 in which the second molded product 3 is molded between the molded product 2 and the second fixed mold 24, and the first fixed mold 24 on the cavity surface of the slide core 22. A wrapping portion forming surface 27 such as an inclined surface or a step surface facing the fixed molds 23, 24 is formed at a portion adjacent to the cavity surfaces of both the fixed mold 23 and the second fixed mold 24. .

(Operation) In the multi-material molding method of the present invention, the movable die 21 and the slide core are
After the first molded product 2 is molded by 22 and the first fixed mold 23, the first fixed mold 23 is replaced with the second fixed mold 24 and the
The molded product 3 is integrally molded with the first molded product 2. At this time, the slide core 22 is slid in the direction in which the end edge of the first molded product 2 is released. Core 22
Between the first core 2 and the first molded product 2 to form a gap between the slide core 22 and the second fixed mold 24 in the second cavity 26 in which the second molded product 3 is molded. Molded product 2
Form a part that wraps around the edge of the. Therefore, in this part, the first molded product 2 and the second molded product 3
The second molded product 3 is formed with a rolled-in portion 7 for preventing the separation from the second molded product 3.

Therefore, in the multi-material molding die used in the multi-material molding method described above, the first fixed mold 23 and the second fixed mold 23 on the cavity surface of the slide core 22 are used as the winding portion forming surface 27.
By forming an inclined surface or a step surface facing the fixed molds 23, 24 in a portion adjacent to both cavity surfaces of the fixed mold 24, the slide core 22 slides when the second molded product 3 is molded. When this is done, a portion around the edge of the first molded product 2 and the like is formed at the boundary between the slide core 22 and the second fixed mold 24.

(Example) Hereinafter, an example of the multi-material molding method and multi-material molding die of the present invention will be described with reference to the drawings.

First, the structure of the shift boot 1 for automobiles, which is a multi-material molded product to be molded, will be described with reference to FIGS. 4 and 5.

The shift boot 1 includes a finisher 2 as a first molded product made of a hard synthetic resin and a boot body 3 as a second molded product made of a soft synthetic resin integrally molded with the finisher 2. ing. The finisher 2 is formed in a rectangular frame shape, and a plurality of leg portions 4 are vertically provided integrally on the peripheral edge of the lower surface of the finisher 2, and the claw portions 5 are provided below the leg portions 4. It is formed so as to project in one direction. On the other hand, the boot body 3 is formed in a flexible bellows tubular shape, and a flange portion 6 formed at a lower end portion of the boot body 3 covers the entire upper surface of the finisher 2. On the lower surface of the flange portion 6, a plurality of winding portions 7 wound downward from the side are integrally formed on the outer peripheral edge portion of the finisher 2, and by these winding portions 7, the boot body 3 and The detachment from the finisher 2 is reliably prevented.

Then, as shown in FIG. 5, the shift boot 1 is mounted on the console body 8 in the automobile, facing the opening 9 formed in the console body 8. That is, the finisher 2 is inserted into the plurality of locking holes 10 formed in the console body 8 on the outer peripheral side of the opening 9.
The leg portions 4 are inserted from above, and the claw portions 5 of the leg portions 4 prevent the leg portions 4 from coming off.

Next, the structure of the multi-material molding die used for molding the shift boot 1 will be described with reference to FIGS. 1 to 3. 1 (A) and 2 (A) are cross-sectional views at a position corresponding to the AA cross section in FIG. 3, and FIGS. 1 (B) and 2 (B) are third cross-sections. It is sectional drawing of the position corresponding to the BB cross section of a figure.

21 is a movable type, 22 is a slide core, 23 is a first fixed type, 24
Is a second fixed type, and the movable type 21 and the slide core 22 are
And the first fixed mold 23 are the first for molding the finisher 2
The cavity 25 of the movable mold 21 and the slide core are formed.
22, the second fixed mold 24, and the finisher 2 form a second cavity 26 for molding the boot body 3. The slide core 22 includes the leg portion 4 in the first cavity 25.
The movable mold is located on four outer sides of the position where the
It is slidably supported on the radial direction. In addition, the fixed molds 23 and 24 include the movable mold 21 and the slide core 22.
The molds are opened and closed in a direction orthogonal to the sliding direction of the slide core 22, but each of them is divided into two parts on the left and right, and can be moved in the left and right directions.

Then, on the cavity surface of the slide core 22,
In a portion adjacent to the cavity surfaces of both the first fixed die 23 and the second fixed die 24, a winding portion inclined toward the fixed die 23, 24 with respect to the sliding direction of the slide core 22. An inclined surface 27 is formed as a forming surface.

Next, the molding method will be described with reference to FIGS. 1 to 3.

First, as shown in FIG.
These movable molds 21 are placed in the innermost position with respect to
The slide core 22 and the first fixed die 23 are closed from the vertical direction in the figure. At this time, the first fixed mold 23, which is divided into two right and left, is first opened and then the slide core 22
After joining to the left side, slide it to the left and right to close it
And is bonded to the cavity surface forming the cavity 26 of FIG.
In this state, the movable die 21, the slide core 22, and the first fixed die 23
A hard synthetic resin such as ABS is injected into the first cavity 25 formed between and to form the finisher 2.

Next, after the finisher 2 is hardened, the first fixed mold 23, which is divided into left and right halves, is opened by sliding in the left and right direction, and then the first fixed mold 23, the movable mold 21, and the slide core 22 are separated. The mold is opened vertically in the drawing. At this time, since the claw portion 5 of the finisher 2 has an undercut shape with respect to the mold closing direction, the finisher 2 remains on the movable mold 21 and the slide core 22 side, and the first fixed mold 23 Will be withdrawn.

Next, after the movable die 21 and slide core 22 on which the finisher 2 is mounted are reversed, the movable die 21 and slide core 22 and the second fixed die 24 are closed as shown in FIG. At this time, the second fixed mold 24 divided into two
Is first opened, and after being joined to the slide core 22, it is slid to the left and right to be closed. At the same time, the slide core 22 is slid outward, that is, in the direction of separating from the finisher 2. In this state, a second cavity 26 is formed between the movable die 21, the second fixed die 24, the slide core 22 and the finisher 2. The slide core 22 is slid in the second cavity 26. When the slanted surface 27 moves away from the peripheral edge of the finisher 2, the portion around the peripheral edge of the finisher 2 at the boundary between the slide core 22 and the second fixed die 24 moves to the movable die 21 and the second die. Is formed in communication with other portions of the second cavity 26, such as between the fixed mold 24 and the fixed mold 24. A gap 28 is also formed between the slide core 22 and the leg portion 4 of the finisher 2.
The second cavity 26 is blocked by the fact that the lower surface of the finisher 2 is still joined to the surface of the slide core 22 adjacent to the lower side of the inclined surface 27 in the drawing.

Then, a soft synthetic resin such as soft vinyl chloride is injected into the second cavity 26 to mold the boot body 3.
At this time, the winding portion 7 is integrally molded with the boot body 3 so as to surround the peripheral portion of the finisher 2 from the four directions in which the slide core 22 is present, and is integrated with the finisher 2.

Next, after the boot body 3 is hardened, the second fixed mold 24, which is divided into two left and right parts, is slid in the left-right direction to open the cavity surface of the second fixed mold 24 from the undercut portion of the boot body 3. Pull out. After that, the movable die 21 and the slide core 22 are retracted so that the movable die 21 and the slide core 22 and the second
The fixed mold 24 and the fixed mold 24 are opened in the vertical direction in the figure. Then, release air is blown between the movable mold 21 and the boot main body 3 to expand and deform the boot main body 3, and the finisher 2
Is ejected by an ejection pin (not shown), and the shift boot 1 in which the boot body 3 and the finisher 2 are integrated is taken out from the movable mold 21 and the slide core 22. The claw portion 5 that is the undercut portion of the finisher 2
Has already been removed from the slide cores 22 when the slide cores 22 are slid before the boot body 3 is molded, and does not hinder the release.

According to the above configuration, it is possible to form one winding portion 7 that prevents the finisher 2 and the boot body 3 from being separated from each other.
This is possible only by adding one slide core 22 in addition to the movable die 21, the first fixed die 23, and the second fixed die 24, and the winding portion 7 can be easily formed with a simple die structure. Moreover, the same slide core 22 can be used for forming the finisher 2 having an undercut portion such as the claw portion 5, so that the structure can be made less wasteful.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7.

In this embodiment, a plurality of protrusions 31 are formed on the inclined surface 27 of the slide core 22. Therefore, the finisher 2
At the time of molding, a plurality of slits 32 are formed on the peripheral edge of the finisher 2. Then, as shown in FIG.
When the boot main body 3 is molded after sliding the slide core 22, the synthetic resin flows into the slit portion 32, and the inside of the winding portion 7 of the boot main body 3 is embedded in the slit portion 32. Reference numeral 33 is a slit portion 33 formed in the boot body 3 by the protruding portion 31 of the slide core 22.

According to the above configuration, the inside of the winding portion 7 of the boot body 3 bites into the slit portion 32 of the finisher 2, so that the peeling resistance of the winding portion 7 from the finisher 2 becomes larger, and the boot body 3 and the finisher 2 It is possible to more reliably prevent the disengagement from.

Note that, depending on the case, the peeling resistance may be further increased by performing a honing process or the like on the protruding portion 31 of the slide core 22 for forming the slit portion 32.

In addition, in the above-mentioned embodiment, the molding of the shift boot 1 has been described, but the present invention can of course be applied to molding of a multi-material molded product other than the shift boot 1.

Further, in the above embodiment, the fixed molds 23, 24 are divided into two left and right, but this is for molding the bellows-shaped boot body 3, and when molding other ones, naturally, , In some cases, a fixed type is used.

Further, in the above embodiment, the winding portion forming surface of the slide core 22 is an inclined surface, but the winding portion forming surface formed in the portion of the cavity surface of the slide core 22 adjacent to the cavity surfaces of both the fixed molds 23, 24 is A stepped surface facing the fixed molds 23, 24 and shallower than a portion of the cavity surface of the slide core 22 adjacent to the inside may be used.

〔The invention's effect〕

According to the present invention, for example, in the portion of the cavity surface of the slide core that is adjacent to the cavity surfaces of both the first fixed mold and the second fixed mold, a winding portion forming surface facing the fixed mold is formed, At the time of molding, after molding the first molded product by the movable mold, the slide core, and the first fixed mold, by sliding the slide core in the direction in which the edge of the first molded product is released, A second mold cavity formed by the movable mold, the slide core, the second fixed mold and the first molded product is formed with a portion around the first molded product,
Since the rolled-in portion for preventing separation of both molded products is formed here, the first molded product can be molded by one slide core, and the rolled-in portion can be formed in the second molded product, which is easy. In addition, the winding portion for preventing separation can be formed with a simple mold structure.

[Brief description of drawings]

1 to 5 show one embodiment of the multi-material molding method and multi-material molding die of the present invention, and FIG. 1 (A)
(B) is a cross-sectional view showing the molding state of the first molded article, and FIGS. 2 (A) and (B) are cross-sectional views showing the molding state of the second molded article.
FIG. 3 is a plan view of the first molded product, the movable mold, and the slide core, FIG. 4 is a perspective view of the shift boot as a multi-material molded product, and FIG. 5 is the shift boot attached to the console body of an automobile. It is sectional drawing of a state. Also, FIGS. 6 and 7
FIG. 6 shows another embodiment of the present invention. FIG. 6 is a sectional view showing a molding state of a second molded product, and FIG. 7 is a plan view of the first molded product, a movable die and a slide core. 6 corresponds to the VI-VI cross section in FIG. 7. 2 ... Finisher as the first molded product, 3 ... Second
Boot body as a molded product of 7 ... Entrainment part, 21 ...
… Movable type, 22 …… Slide core, 23 …… First fixed type,
24 …… Second fixed mold, 25 …… First cavity, 26 ……
The second cavity, 27 ... An inclined surface as a surface for forming the rolled-in portion.

Claims (2)

[Claims] 1. A multi-material molding method in which, when a plurality of molded products made of different materials are integrally molded, a winding portion is formed that prevents one molded product from being caught in another molded product and prevents the molded product from coming off. And a movable die, a slide core slidably provided on the movable die, and a first fixed die are closed to form a first cavity, and a first molded product is formed in the first cavity. Molding, and leaving the first molded product in the movable mold and the slide core to open the movable mold and the slide core and the first fixed mold, and to make the slide core the end of the first molded product. The movable part, the slide core, and the second fixed mold are closed while the edges are slid in the mold releasing direction, and the first molded product is formed at the boundary between the slide core and the second fixed mold. A second cavity with a portion that wraps around Multi material molding method characterized by form molding a second molded article to the second cavity. 2. A multi-material molding method in which, when a plurality of molded products made of different materials are integrally molded, a rolled-in portion is formed to prevent one molded product from being caught in another molded product to prevent the molded product from coming off. And a slide core slidably provided on the movable die, and the movable die and the slide core are opened and closed to close the movable die and the slide. A first fixed mold that forms a first cavity for molding a first molded product between the core and the core; and the movable mold and the slide core are openably and closably closed to form the movable mold, the slide core, and the first mold. A second fixed die that forms a second cavity in which the second molded article is molded between the first fixed die and the second fixed die on the cavity surface of the slide core. Both fixed Multi material mold, characterized in that Yabiti surface and winding forming surface facing toward the fixed mold to the adjacent portion is formed.