JP3404672B2 - Skin in-mold mold and molding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention molds a molded product such as a glove box lid of an automobile or an instrument panel, which is obtained by forming a molded product on the back surface of the skin with the skin placed in a mold. The present invention relates to a skin in-mold forming die and a forming method.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, for example,
A lid 1 of a glove box of an automobile is composed of a front lid body 2 and a cover body 4 in which a tip portion of a leg portion 3 formed on a back surface side of the lid body 2 is welded and integrated.

The lid main body 2 is formed by skin in-mold molding, and has a resin core material 5 and a skin 6 that decorates the surface of the resin core material 5. The skin 6 is The end portion is formed in a winding portion 7 having a substantially U-shape or V-shape, and the resin core material 5 is inserted into the winding portion 7 to be end-treated. The winding portion 7 of the lid body 2 is in contact with the terminal bent portion 4a of the cover body 4 so that the resin core material 5 is not exposed on the surface.

The skin 6 is formed by cutting a skin material having a cushion layer 6b made of PEF laminated on a skin layer 6a made of cloth, vinyl chloride or TPO into a predetermined size and then forming it into a predetermined shape by vacuum forming. It was formed by.

As shown in FIG. 8, the lid body 2 is generally in the shape of a rectangle composed of two short sides 2a, 2a and two long sides 2b, 2b. The gate portion 8 for injecting the resin is generally located at a substantially central portion of the lid main body 2 so that the molten resin is evenly distributed from the center to the end of the cavity of the molding die. As a result, the distance from the center to the end of the cavity, that is, the distance X from the gate portion 8 to the long side 2b is shorter than the distance Y to the short side 2a.

From these points, the conventional mold shown in FIGS. 9 and 10 will be examined.

That is, FIG. 9 shows the middle of the mold clamping process of the upper mold 9 and the lower mold 10, and FIG. 10 shows the upper mold 9 and the lower mold 1.
0 and 0 are completely clamped, and the molding of the lid body 2 is completed. 9 (1) and 10 (1) respectively show the long side 2b side end portions of the lid body 2, and FIGS. 9 (2) and 10 (2) respectively show the short side of the lid body 2. The end is shown.

The conventional mold comprises an upper mold 9 as a fixed mold and a lower mold 10 as a movable mold, and the upper mold 9 holds a slide core 11.

In molding the lid main body 2, first, with the lower mold 10 open, the outer skin 6 is arranged along the mold surface of the upper mold 9 with respect to the upper mold 9. Then, the molten resin 13 is injected from the gate portion 8 into the cavity 12 in a state where the lower mold 10 is brought close to the upper mold 9, and then the lower mold 10 is driven close to the upper mold 9, 9 (1) and (2), the lower die 10 is driven closer to the upper die 9, and the resin core material 5 is integrally formed with the outer skin 6,
The lid body 2 is molded.

Further, as another conventional molding die, Japanese Patent No. 2
11 and 12 in the Japanese Patent No. 611593.
The following is proposed.

According to this, as shown in FIG. 11, the slide core 11 held by the upper mold 9 has the first sliding contact surface 14 extending in the mold opening / closing direction at the position of the end of the skin 6, and The mold 10 includes a second sliding contact surface 16 and a second sliding contact surface 16 that are in sliding contact with the first sliding contact surface 14.
Vertical mold surface 1 which is continuous with the sliding contact surface 16 and extends along the mold opening / closing direction
6 and a space 17 is formed between the first sliding contact surface 14 and the vertical mold surface 16 in the middle of molding when the lower mold 10 is close to the upper mold 9, and the end of the skin 6 projects into the space 17. Also does not come into contact with the vertical mold surface 16.

As described above, the end of the skin 6 is formed so as not to contact the vertical mold surface 16 even though the end of the skin 6 is projected into the space 17, so that the end of the skin 6 does not interfere with the lower mold 10. When the length of the terminal becomes long due to the cutting error of the outer skin 6 or the like, it is attempted to prevent the generation of wrinkles due to the interference with the lower mold 10.

[0013]

[Problems to be Solved by the Invention] However, the above 2
In the two conventional technologies, the molten resin 13 is
In the case of molding a product having a gate position and an outer dimension in which the propagation velocity reaching from the center side to the end portion of the lid main body 2 is different between the short side 2a side and the long side 2b side, Problem occurs.

That is, the molten resin 13 is clamped by the mold clamping.
9 (1) or FIG. 11 () which shows the long side 2b side due to the difference in distance between the short side 2a side and the long side 2b side. In 1), the molten resin 13 has already reached the end of the winding portion 7 of the skin 6, but in FIG. 9 (2) or 11 (2) showing the short side 2a side, it has not yet reached. Will be.

From this state, when the lower die 10 is further clamped to the upper die 9 to the state of FIG. 12, the short side 2a side is shown in FIG. 10 (2) or FIG. 12 (2). Then, the molten resin 13 has just entered into the rolled-in portion 7 of the skin 6, and is in a good state. However, in FIG. 10 (1) or FIG. 12 (1) showing the long side 2b side, the molten resin 13 The propagating pressure causes the end portion to curl up, and the molten resin 13 enters between this end portion and the lower mold 10 and the slide core 11,
Even if the resin core material 5 is exposed on the surface of the lid main body 2 as a finished product and the cover body 4 is covered, the exposed portion of the resin core material 5 cannot be covered, resulting in a defective product. Further, even if the exposed portion of the resin core material 5 is not formed, the winding portion 7 is pushed by the propagating pressure of the molten resin 13,
Wrinkles may form, which is a very defective product.

In view of the above point, the present invention ensures that the molded resin core material is covered by the wound portion of the skin and exposed even when the molten resin has a different propagation speed in the cavity depending on the shape of the skin. It is an object of the present invention to provide a skin in-mold molding die and a molding method intended not to do so.

[0017]

In order to achieve the above first object, the present invention according to claim 1 is characterized in that a skin having a shape in which an end portion is wrapped around is formed on a first mold surface of a first mold. In the outer skin in-mold forming die, the second die is driven so as to approach the outer skin, and the molten resin is compressed between the second die surface of the second die and the outer skin, The first mold has a first sliding contact surface extending in the mold opening / closing direction at the position of the end of the skin,
The second mold is continuous with the second sliding contact surface that is in sliding contact with the first sliding contact surface and the second mold surface, and extends in the direction of the second sliding contact surface.
The present invention relates to a skin-in-mold forming die, which is configured to have an inclined mold surface that is inclined in an upward slope in the first mold surface direction and guides the end portion of the skin by abutting on the guide surface.

Further, according to the present invention as set forth in claim 2, a skin having a shape in which an end portion is wrapped around is arranged along the first mold surface of the first mold, and the second mold is brought close to the skin. Using a skin in-mold molding die that is driven to compress and mold a molten resin between the second mold surface of the second mold and the skin, the first mold is a mold at a position of an end portion of the skin. The second mold has a first sliding contact surface extending in the opening / closing direction, the second mold is continuous with the second sliding contact surface that is in sliding contact with the first sliding contact surface, and extends in the direction of the second sliding contact surface. Existing and having an inclined mold surface that inclines in an upward gradient in the direction of the first mold surface , and the end of the skin is formed by the inclined mold surface during molding in which the second mold is close to the first mold. The present invention relates to a method for forming a skin in-mold, characterized in that it is brought into contact with a surface and guided in sliding contact with the inclined mold surface in the molding process.

According to the present invention, when the second die is driven close to the first die, the end of the epidermis abuts and is guided to the inclined die surface continuously formed on the second die surface. Therefore, even at a portion where the propagation speed of the molten resin is high, the contact between the inclined surface and the end of the skin causes the molten resin to roll up the end of the skin, or between the inclined surface and the end of the skin. It is possible to prevent the molten resin from entering between them, and it is possible to mold a good molded product.

The present invention according to claim 3 provides the invention according to claim 2.
The curved portion shape of the end portion of the skin of the invention described, the
It is characterized in that it has a substantially V shape in which the opening widens toward the center side of the second mold surface .

According to the present invention, when the cushion layer forming the back surface side of the skin is relatively thick, the wound portion cannot be formed in a U shape, and it is particularly effective when it becomes a V shape. Is. What happens is that if the cushion layer is relatively thick or the shape is made thin, if the wrapping portion is simply formed on the skin, the wrapping portion will stick to the back side of the skin and the molten resin will be formed on the wrapping portion during molding. Since it is possible that it will not enter and become a defective product, the shape of the winding part is formed into a substantially V shape that expands inward, and the end of the epidermis abuts on the inclined surface and guides. By doing so, it is intended that the molten resin surely propagates in the rolled-in portion.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view showing a molding die according to one embodiment of the present invention, and FIG. 1 (1) shows an injection state of molten resin during a mold clamping process.
(2) shows the completion of mold clamping. FIG. 2 is a plan view showing the positional relationship of the four slide cores with respect to the upper mold (or the lower mold).

The forming die 20 in FIGS. 1 and 2 is located on four sides of the upper die 21 (first die) as a fixed die and the upper die 21 and is slidable in a horizontal direction with respect to the upper die 21. The slide core 23 to be held and the lower mold 2 as a movable mold
2 (second type).

The upper die 21 has four slide cores 23 and a first die surface 25 that conforms to the shape of the box-shaped skin 6. The slide core 23 is formed with a first vertical burr cutting surface 26 extending in a substantially vertical direction (this first
The sliding contact surface 26 is directly formed on the upper die 21 when the slide core 23 is not used). Further, in succession to the first sliding contact surface 26, in the direction of the upper mold 21, the horizontal mold surface 23
a is continuous, and the tip is a vertical mold surface 23b.

The lower mold 22 has a second mold surface 28 that forms a cavity 24 together with the first mold surface 25 of the upper mold 21, a second sliding contact surface 27 that makes sliding contact with the first sliding contact surface 26, and a second sliding surface 27. continuously to the mold surface 28 and the first mold surface extends in a direction of the second sliding contact surface 27
It is configured to have a sloped surface 29 that slopes upward in 25 directions.

The inclined mold surface 29 is constructed so that the end 32 of the outer skin 30 passing through the winding portion 31 comes into contact with the upper mold 21 while the lower mold 22 approaches the upper mold 21.
The terminal 32 of 0 is guided by sliding contact with the inclined surface 29. A horizontal die surface 27 a is formed between the inclined die surface 29 and the second sliding contact surface 27.

As a result, the first die surface 25 of the upper die 21 and the horizontal die surface 23a of the slide core 23, together with the second die surface 28 of the lower die 22, conform to the shape of the outer skin 6 formed in the box shape. The cavity 24 is formed.

Next, the molding process by the molding die of the present invention having the above-mentioned structure will be described with reference to FIG.

FIG. 3 shows a terminal 32 of the skin 30 in FIG.
It is sectional drawing which expands and shows the vicinity.

In molding the lid body 2, first, the upper mold 2
1 with the lower mold 22 open, the mold surface 2 of the upper mold 21.
PE along the cloth, vinyl chloride or TPO as shown in 5.
The skin material in which F is laminated is cut, and the skin 30 formed into a predetermined shape so as to have the winding portion 31 at the end is arranged. Then, when the lower mold 22 is close to the upper mold 21 to some extent (the condition of FIG. 3 (1)), PP, PPC, AB
A molten resin 33 made of a general-purpose resin such as S or PC is injected from the gate portion 34 into the cavity 24 in a dumpling shape, and thereafter, the lower mold 22 is driven closer to the upper mold 21, and the lower mold 22 is driven as shown in FIG. ) State. When this state is reached, the end 32 of the skin 30 comes into contact with the inclined mold surface 29 of the lower mold 22. From this point on, in the process of driving the lower die 22 closer to the upper die 21, the molten resin 33 in a dumpling shape is compressed and the inclined die surface 29 slides and guides the end 32 of the outer skin 30. It will be.

As a result, the winding portion 31 of the skin 30 is
It is always held in a V shape ( opening toward the center of the second mold surface 28) (this shape is possible when the cushion layer 30b of the skin 30 is relatively thin). Since the molten resin 33 surely propagates in the winding portion 31 and the end 32 of the outer skin 30 is always in contact with the inclined surface 29, the molten resin 33 rolls over the end 32 of the outer skin 30, There is no leakage into the space 35 formed by the lower mold 22, slide mold 23, and lower mold 22.

Therefore, at the completion of the mold clamping shown in FIG. 3C, as a result of the molten resin 33 propagating, the sloping mold surface 29 of the wound portion 31 of the skin 30 causes the cushion layer 30b of the skin 30 to be crushed slightly, The horizontal mold surface 23b of the slide core 23 and the horizontal mold surface 27a of the lower mold 22 form a U-shaped winding portion 31 together with the skin layer 30a, and the inclined mold surface 29 causes the terminal 32 to move slightly inward. The lid body 1 is molded in the bent state, and at this time, the resin core material 5 formed of the molten resin 33 is covered by the winding portion 31 of the outer skin 30 at the end thereof, When 2 is assembled integrally with the cover body 4, it is not exposed.

Since the end of the skin 30 is bent inward slightly by the inclined mold surface 29, the end 32 of the skin 30 is formed by the cutting error of the skin.
On the other hand, even if the molding is performed with a slight deviation, the molten resin 33 does not leak during the molding process, which contributes to improving the appearance of the lid 1 of the glove box.

The shape of the wound portion 31 of the skin 30 is such that the cushion layer 3 is formed at the stage of preforming after cutting the skin material.
If 0b is made thin or when the shape has been adopted as a relatively thick, although the exhibit shape of V, the anchoring portions 31 of the V-shaped this, as shown in FIG. 4, the terminal 32
Is formed so as to open larger toward the center of the second mold surface 28, the end 32 can be brought into contact with the inclined mold surface 29 early in the molding process. Therefore, the function of further preventing leakage of the molten resin 33 can be improved.

This is as shown in FIG.
By further bending 32a toward the lower die 27, the end 32 can be brought into contact with the inclined die surface 29 at an earlier stage of the molding process, thereby further preventing the molten resin 33 from leaking out. The function can be improved, and the shape of the lid body 2 can be molded to be more stable.

[0037]

As described above, according to the present invention, when the second die is driven close to the first die, the end of the epidermis is formed on the inclined die surface continuously formed on the second die surface. Are contacted with each other and guided, even if the molten resin propagates at a high speed, the contact between the inclined surface and the end of the skin causes the molten resin to roll up the end of the skin, or The molten resin can be prevented from entering and leaking between the surface and the end of the skin, and a good molded product can be molded.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a skin in-mold forming die according to an embodiment of the present invention, (1) shows an injection state of a molten resin in the middle of a die clamping process, and (2) shows when the die clamping is completed. Are shown respectively.

FIG. 2 is an explanatory diagram showing a positional relationship of four slide cores with respect to an upper die (or a lower die) in FIG. 1 in plan view.

3 is an enlarged cross-sectional view showing the vicinity of the end of the skin in FIG. 1, (1) during injection of molten resin, (2) during propagation of the molten resin into the cavity by compression,
(3) shows the completion of mold clamping when the compression of the molten resin is completed.

FIG. 4 is a diagram showing another embodiment of the present invention.
It is a sectional view similar to (1).

FIG. 5 is a sectional view similar to FIG. 3 (1) according to still another embodiment of the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a perspective view showing a lid of a glove box of an automobile.

8 is a sectional view taken along line VII-VII of FIG.

FIG. 9 is a longitudinal cross section of a main part showing a molding process in an example of a conventional skin in-mold forming die, (1) showing a long side and (2) showing a short side.

FIG. 10 is a longitudinal cross-sectional view of a main part showing the completion of molding in an example of a conventional skin in-mold molding die, (1) showing the long side and (2) the short side.

FIG. 11 is a longitudinal cross section of a main part showing a molding process in another example of the conventional skin in-mold molding die, wherein (1) shows the long side and (2) shows the short side.

FIG. 12 is a longitudinal cross-sectional view of a main part showing the completion of molding in another example of the conventional skin in-mold molding die, wherein (1) shows the long side and (2) shows the short side.

[Explanation of symbols]

1 lid 2 Lid body 4 cover body 20 Mold 21 Upper mold (first mold) 22 Lower mold (second mold) 23 Slide core 25 First mold surface 26 First Sliding Surface 27 Second sliding surface 28 Second mold surface 29 Inclined surface 30 epidermis 31 Roll-in section 32 terminals 33 Molten resin 34 gates

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 33 / 12,33 / 14 B29C 45 / 14,45 / 26

Claims (3)

(57) [Claims] 1. A second skin of the second mold is arranged by arranging a skin of which the end portion is wrapped around along a first mold surface of the first mold and driving a second mold so as to approach the skin. In a skin-in-mold molding die for compressing and molding a molten resin between a mold surface and the skin, the first mold has a first sliding contact surface extending in a mold opening and closing direction at a position of an end portion of the skin, The second mold is continuous with the second sliding contact surface that is in sliding contact with the first sliding contact surface, extends in the direction of the second sliding contact surface, and has an upward slope in the first molding surface direction. in inclination <br/> oblique to the skin-mold form characterized by being configured with a slanted surface for guiding by contacting an end portion of the skin. 2. A second skin of the second mold is arranged by arranging a skin of which the end portion is wrapped around along the first mold surface of the first mold and driving the second mold so as to approach the skin. A skin-in-mold molding die in which a molten resin is compressed and molded between the mold surface and the skin.
Used, the first type having a first sliding surface extending in the mold opening and closing direction to the position of the end portion of the epidermis, the second type the said first sliding surface and the second sliding surface in sliding contact with It has a slanted mold surface which is continuous with the second mold surface and extends in the direction of the second sliding contact surface and which is inclined upwardly in the first mold surface direction. A skin characterized in that the end of the skin abuts the inclined mold surface during the molding in which the two molds are close to the first mold and is slidably guided to the inclined mold surface in the molding process. In-mold molding method. 3. The shape of the wraparound portion at the end portion of the skin is approximately V, which is an opening widening toward the center side of the second mold surface.
The outer skin in-mold molding method according to claim 2, wherein the outer skin is in-molded.