JPH08174557A - Mold apparatus for press molding of resin - Google Patents

Abstract

PURPOSE: To produce a molded product composed only of a resin and a skinned molded product by the same mold. CONSTITUTION: In a mold apparatus for the press molding of a resin injecting a molten resin into the cavity formed by first and second molds opposed to each other and clamping the both molds to mold the resin, the resin seal frame arranged so as to be slidable in a mold clamping direction, the skin material holding frame 40 held so as to provide a definite distance from the second mold 20 and a skin material holding member 45 equipped with the skin material engaging part 42 of a skin material H and moved accompanied by the movement of the skin material H are provided to the outer periphery of the first mold 10. The space for the movement of the skin material engaging member 42 arranged to the outer periphery of the first mold 10 is formed to the second mold 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for press molding of a core material layer made of a thermoplastic resin or the like, and in particular, it is a molded product made only of resin or a molded product obtained by integrally molding a skin material and resin. The present invention relates to a mold for resin press molding.

[0002]

2. Description of the Related Art Generally, for interior parts of automobiles, a molded product with a skin is widely used in which various skin materials are laminated on the surface of a base material made of a thermoplastic resin or the like in order to give a high-grade feeling. In addition, as a general-purpose product, a molded product made of only a resin in which a cavity surface of a molding die is textured and a skin material is not used is also provided.

When manufacturing the molded product with the skin and the molded product without the skin, it is necessary to manufacture separate molding dies. In other words, when molding a molded product with a skin, the skin material is placed between the opposing molds and the mold is clamped, and the molten synthetic resin is injected between the skin material and one of the molds to perform compression molding or the like. It is formed by.

Therefore, when a resin-molded product which does not use a skin material is molded by a mold using such a skin material,
When the molds are clamped, a gap corresponding to the thickness of the skin material is generated between the molds, and the resin leaks from the gaps of the clamped molds, resulting in burr.

[0005]

As described above, according to the prior art, in order to obtain a molded product with a skin, a resin press molding die with a skin is required, and a resin-only molding without a skin material is required. In the case of a product, a resin press molding die without a skin material was required. For this reason, even if the products have the same shape, it is necessary to separate the molds depending on the presence or absence of the skin material, and there is the inconvenience that the die cost is separately charged depending on the existence of the skin material.

It is an object of the present invention to provide a molded product of resin only,
It is an object of the present invention to provide a resin press-molding die capable of manufacturing a molded product with a skin in the same die.

[0007]

According to another aspect of the present invention, there is provided a resin press molding die apparatus, wherein a cavity is formed by first and second dies facing each other, and a molten resin is provided between the dies facing each other. In a mold device for resin press molding, which comprises injecting and clamping molds, a resin seal frame slidably disposed in the mold clamping direction and a second mold are provided on the outer periphery of the first mold. The second mold is provided with a skin material holding frame held at a constant distance from the mold, and a skin material holding member that includes a skin material locking member that engages with the skin material and that moves with the movement of the skin material. Is formed with a space for moving the skin material locking member arranged on the outer periphery of the first mold.

More specifically, in a resin press molding die apparatus in which a cavity is formed by opposing first and second dies, and a molten resin is injected between the opposing dies to clamp the dies. A resin seal frame disposed slidably in the mold clamping direction, and a skin material holding frame disposed in conjunction with the resin seal frame, on the outer periphery of the first mold, The resin seal frame includes a contact portion that contacts the second die, a sliding contact portion that slidably contacts the first die, a holding frame movable range portion that allows the skin material holding frame to move, and And a means for sliding it in the mold clamping direction, the skin material holding frame comprises a skin material locking member and a moving means of the skin material locking member, and the skin material is mounted on the skin material holding frame. In this case, the skin material is held by the skin material locking member of the skin material holding frame, and the skin material is moved according to the movement of the skin material during mold clamping. Move the stop member, the resin sealing frame characterized in that it moves together with the second mold and the resin sealing frame in contact with the second mold.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1 to 4 show a mold when the skin material is not integrally molded. FIG. 1 is a cross-sectional explanatory view of an initial state in which the mold is opened, and FIG. FIG. 3 is a cross-sectional explanatory view showing a state where the mold has started to be clamped, FIG. 3 is a cross-sectional view showing a mold clamping operation state in a compression step, and FIG. 5 to 8 show a mold for integrally molding a skin material. FIG. 5 is a sectional explanatory view of an initial state in which the mold is opened, and FIG. 6 shows a mold in which resin is injected. FIG. 7 is a cross-sectional explanatory view showing a state in which tightening has started, FIG. 7 is a cross-sectional clear view showing a mold clamping operation state in a compression step, FIG. FIG. 11 is an explanatory diagram of a skin material holding frame, and FIG. 11 is an explanatory diagram of a stop portion of the skin material holding frame.

As shown in FIG. 1, the resin press molding die of this embodiment is composed of a first die 10 and a second die 20, and these first die 10 and second die What is the mold 20?
It is arranged facing each other. In this example, the first mold 10 is a fixed mold, and the second mold 20 is a movable mold. Then, the first mold 10 and the second mold 20 form a cavity K having a predetermined shape.

The first mold 10 of this embodiment has a passage 11 for the molten synthetic resin J formed at a predetermined position.
Through the valve gate 12, the molten synthetic resin J is injected into the cavity K. A guide recess 13 is formed at a predetermined position on the outer periphery of the first mold 10, and a through hole 14 is formed in the guide recess 13. Reference numeral 15 is a valve operating cylinder, and reference numeral 16 is a rod valve.

Then, from the supply device (not shown) of the molten synthetic resin J, the passage 1 in the first mold 10 which is the stationary mold.
The molten synthetic resin J is injected into the cavity K through the gate 1 and the gate 12. Also in this example,
After the pressure die is clamped by the first die 10 and the second die 20, cooling and the like can be performed. Known techniques can be used for the device for injecting the molten synthetic resin J, the mold clamping device, and the like.

The resin used as a base material in the present invention, that is, the molten synthetic resin J to be injected is, for example,
Polypropylene, polyethylene, polystyrene, acrylonitrile-styrene-butadiene copolymer, thermoplastic resin such as nylon, ethylene-propylene block copolymer, thermoplastic elastomer such as styrene-butadiene block copolymer Compression molding, injection molding and extrusion Any of those usually used for molding can be used. In addition, those containing additives such as inorganic fillers, fillers such as glass fibers, pigments, lubricants, and antistatic agents can also be appropriately used.

The guide recess 13 is formed on the outer periphery of the first mold 10.
A resin seal frame 30 is disposed at a position on the extension of the. This resin seal frame 30 is for contacting the mold surface 21 of the second mold 20 and closing the outer peripheral portion of the product to be molded to prevent resin leakage at a set position before completion of mold clamping. The outer periphery of the first mold 10 is formed so as to be slidable in the mold clamping direction. Further, a skin material holding frame 40, which will be described later, is arranged on the resin seal frame 30 so as to interlock with each other.
This interlocking is performed by connecting with a connecting member (not shown), and this connecting member is provided with an adjusting device capable of adjusting the gap between the resin seal frame 30 and the skin material holding frame 40.

The resin seal frame 30 of this example is used as the second mold 2.
A slide contact portion 32 that has a contact surface 31 that abuts the mold surface 21 of 0 and slides in contact with the first mold 10, a holding frame movable range portion 33 that allows the skin material holding frame 40 to move, and a resin seal. Frame 30
Means 35 for sliding the first mold 10 in the mold clamping direction X
The through hole 35a, the recessed portion 35b, the guide rod 35c, and the springs 35d and 35e which constitute a part of the above are constituent elements.

That is, in the resin seal frame 30 of the present embodiment, a through hole 35a is formed in the resin seal frame 30 so as to be aligned with the guide recess 13 formed in the first mold 10, and the through hole 35a has a first hole. The concave portion 35b is continuously formed on the second die 20 side.

As means 35 for sliding the resin seal frame 30 in the mold clamping direction X, the guide recess 13 and the through hole 14 of the first mold 10 and the through hole 35 of the resin seal frame 30.
A guide rod 35c is provided in the a and the recess 35b, and a spring 35d is provided between the first die 10 and the resin seal frame 30 on the outer periphery of the guide rod 35c. And the skin material holding frame 40 between the spring 3
5e is provided.

The guide rod 35c is arranged such that its tip end abuts on the skin material holding frame 40 described below. When the one side 21 of the first mold 10 is rectangular, the resin seal frame 30 is configured as shown in FIG. 9, and the sides of the rectangle are in close contact with each other.

The skin material holding frame 40 of this example holds the skin material H when the skin material H is mounted, and is in a predetermined position of the cavity K when the skin material H is not mounted,
The second mold 20 is configured so that the distance from the mold surface 21 of the second mold 20 is kept constant. The skin material holding frame 40 includes a main body 41.
And a plurality of skin material locking members 4 arranged on the main body 41
2 and a movable means 43 of the skin material locking member 42, and stopper portions 41a, 41a protruding toward the second mold 20 are formed at both side ends of the main body. Note that FIG.
The arrangement position of the stop portion 41a is shown in FIG.

The skin material locking member 42 of this example is composed of a needle protruding toward the second mold 20, and the movable means 43 of the skin material locking member 42 of this embodiment is a guide portion 44 and a skin. The holding member 45 of the material locking member 42, the guide rod 46, and the spring 47 are components. As the skin material locking member 42, other than the needle, a member capable of holding the skin material H,
For example, a holding member such as a clip or a hook-shaped hooking member can be used.

In the main body 41 of the skin material holding frame 40 of this example,
The holding holes 41c for the guide rods 46 are formed in the number perpendicular to the mold clamping direction X according to the number of the skin material locking members 42, and the guide recesses 41b are formed continuously to the holding holes 41c. There is. Further, a rail-shaped guide portion 44 (in this example, there is one, but a plurality of guides may be provided) is formed on the second mold 20 side of the main body 41. Holding member for stop member 42 (that is, skin material holding member) 45
Are slidably supported. The skin material holding frame 40
When the first mold 10 has the shape shown in FIG. 9, the corners are arranged apart from each other.

A holding member 45 of the skin material locking member 42 of this embodiment.
Is composed of an L-shaped plate, and a needle as a skin material locking member 42 is attached to the upper surface of the L-shaped long side, and the surface opposite to the skin material locking member 42. 42a is engaged with the guide portion 44. An engagement hole 45a is formed on the short side of the L-shape, and a guide rod 46 is inserted through the engagement hole 45a.

The guide rod 46 penetrates the engaging hole 45a and has one end serving as a locking portion 46a, which is locked to the holding member 45 of the skin material locking member 42, and the other end of the guide rod 46 is , The guide recess 41b of the main body 41 and the holding hole 41c. A spring 47 is arranged between the L-shaped short length on the outer periphery of the guide rod 46 and the guide recess 41b, and is normally urged by the spring 47 so that the skin material locking member 42 (needle in this example). ) Is located on the outer side of the cavity K.

The second mold 20 has a concave portion 22 forming a cavity K at the center thereof, and the inner surface of the concave portion 22 is textured. The movable recess 23 of the skin material locking member 42 is provided outside the cavity K. The movable concave portion 23 of the present example includes the above-mentioned skin material locking member 42.
The recess is slightly deeper than the height of the needle. A suction hole 24 is formed at a position outside the movable recess 23 of the second mold 20 of this example, and the suction hole 24 is connected to a vacuum device (not shown) via a passage 25 in the mold 20. Has been done.

Next, the operation of the resin press-molding dies 10 and 20 having the above-mentioned structure will be described. First, FIGS. 1 to 4 will be described with reference to FIGS. To do.

FIG. 1 shows an initial state, in which the springs 35d and 35e are in an extended state, and the resin seal frame 30 is located on the second mold 20 side. Further, with the spring 47 of the skin material holding frame 40 also extended, the holding member 45 of the skin material locking member 42 is located on the outermost side from the cavity K. Then, a spacer plate 38 for mold clamping adjustment is provided between the resin seal frame 30 and the first mold 10. The spacer plate 38 is a donut-shaped plate body.

Next, as shown in FIG. 2, the second mold 20 is used.
Is clamped in the direction of the first mold 10 and the molten synthetic resin J is injected by an injection device (not shown). The injected molten synthetic resin J is supplied from the gate 12 into the cavity K through the passage 11 in the first mold 10. At this time, the first mold 10 and the second mold 20 are not completely closed. Therefore, the air in the cavity K is discharged from between the first mold 10 and the second mold 20.

Further, when the first mold 10 and the second mold 20 are clamped, the mold surface 21 becomes a main body 41 of the skin material holding frame 40.
The skin material holding frame 40 is moved by contacting the stop portions 41a, 41a on both sides of. This moving distance is moved within a range (distance) preset by an adjusting device capable of adjusting the gap between the resin seal frame 30 and the skin material holding frame 40 (not shown). Then, as shown in FIG. 3, the mold surface 21 of the second mold 20 and the contact surface 31 of the resin seal frame 30 contact each other. The molten synthetic resin J injected into the cavity K is prevented from leaking out of the cavity K due to the contact between the mold surface 21 of the second mold 20 and the contact surface 31 of the resin seal frame 30. .

When the mold surface 21 and the contact surface 31 come into contact with each other, the resin seal frame 30 and the skin material holding frame 40 are pressed according to the movement of the second mold 20, and the resin seal frame 30 and the skin are The material holding frame 40 moves in the arrow X direction (FIG. 2).

Therefore, the first and second molds 10, 20
The resin seal frame 30 and the skin material holding frame 4 are clamped by
0 moves against the springs 35d and 35e. At this time, since the spring 46 is still extended, the skin material locking member 42 remains in the initial position. Since the skin material H is not used, the resin seal frame 30 contacts the spacer plate 38.

Further, as shown in FIG. 4, when the mold clamping is completed, the rod valve 16 is moved by the cylinder device 15.
Is driven to close the gate 12. At this time, the first mold 1
The resin seal frame 30 and the skin material holding frame 40 are most strongly clamped against the springs 35d and 35e in accordance with the mold clamping of 0 and the second mold 20.

In this embodiment, the timing for closing the rod valve 16 differs depending on the product shape and the resin characteristics, so it is set by a known or well-known timer or position sensor, and the cylinder device 15 is operated to extend the rod valve 16. And, by retracting the rod valve 16, the closing timing of the rod valve 16 can be optimized.

Next, the case of integrally molding the skin material H and the molten synthetic resin J will be described with reference to FIGS. As the material of the skin material H used in the present invention, a thermoplastic resin such as woven cloth, non-woven cloth, polyolefin, vinyl chloride, nylon, etc., and a thermoplastic elastomer sheet such as polyolefin series, polyester series, urethane series, vinyl chloride series, etc. 、 The film is mentioned. Further, the above-mentioned materials may be used alone or a laminate of two or more of them may be used as the skin material H.

In order to give a softer feel, the skin material H
With a foamed sheet of polypropylene, polyethylene, urethane, etc. attached to the back surface of the cloth, or a cloth or sheet for the purpose of protecting it from the heat of the molten synthetic resin during molding and strengthening the adhesive force between the skin material H and the core material layer It is also possible to use a laminate in which the above and the like are attached to the back surface. In using these skin materials H, preheating may be performed prior to the supply in order to adjust the tensile stress and elongation of the skin material H.

As the resin used as the base material, that is, the molten synthetic resin J to be injected, the same materials as described above can be used. In this example, the skin material H
The spacer plate 38 is not attached in order to use.

The initial state is basically the same as the state shown in FIG. 1 as shown in FIG. 5, but in this example,
The skin material H is attached to the second mold 20. The attachment of the skin material H is performed by operating a vacuum device (not shown), and the suction hole 2
4, and the skin material H is attached to the second mold 20.

Next, as shown in FIG. 6, the second mold 20 is used.
Is clamped in the direction of the first mold 10 and the molten synthetic resin J is injected by an injection device (not shown). Second mold 2
When 0 moves, the skin material locking member 42 provided on the skin material holding frame 40 pierces the skin material H, and the skin material H is held together with the suction holes 24 by the skin material locking member 42.

The injected molten synthetic resin J is supplied from the gate 12 into the cavity K through the passage 11 in the first mold 10. At this time, the first mold 10 and the second mold 20 are not completely closed. Therefore, the air in the cavity K is discharged from between the first mold 10 and the second mold 20.

When the first die 10 and the second die 20 are clamped, the skin material H is pressed against the die surface 21 of the second die 20. Further, the stop portions 41a, 41a on both sides of the main body 41 of the skin material holding frame 40 and the mold surface 21 come into contact with each other, and the second mold 2
A space in which the skin material H can move is formed between 0 and the skin material holding frame 40. The mold clamping is performed while the holding member 45 and the skin material locking member 42 move toward the cavity K along the guide portion 44 against the spring 47. Thus, as shown in FIG. 7, the second mold 20
The mold surface 21 and the contact surface 31 of the resin seal frame 30 contact each other via the skin material H.

In this way, the mold surface 21 of the second mold 20,
The molten synthetic resin J injected into the cavity K is prevented from leaking out of the cavity K due to the contact with the contact surface 31 of the resin seal frame 30. At this time, mold surface 2
1 and the holding member 45 are in a state in which a gap (thickness) of the skin material H is opened. Further, the mold surface 21 and the holding member 4
Since 5 is a state in which a gap is opened, the skin material H can be moved to the cavity K side without being affected by the mold surface 21.

Then, the resin seal frame 30 and the skin material holding frame 40 are clamped by clamping the first and second molds 10 and 20.
Moves against the springs 35d and 35e.

Further, as shown in FIG. 8, when the mold clamping is completed, the rod valve 16 is moved by the cylinder device 15.
Is driven to close the gate 12. At this time, the first mold 1
The resin seal frame 30 and the skin material holding frame 40 are most strongly clamped against the springs 35d and 35e in accordance with the mold clamping of 0 and the second mold 20.

Also in this example, the timing for closing the rod valve 16 differs depending on the product shape and the resin characteristics.
It is possible to optimize the closing timing of the rod valve 16 by operating the cylinder device 15 to extend and retract the rod valve 16 by setting by a timer or a position sensor, which is well known and well known in the art.

In the above-mentioned embodiment, the guide rod 35c and the springs 35d and 35e are used as the means 35 for sliding the resin seal frame with the first mold 10 in the mold clamping direction, but other means are provided. Alternatively, a hydraulic or pneumatic cylinder device may be used. Although the stoppers 41a are provided on both sides of the main body 41, they may be provided between the holding members 45.

[0046]

As described above, according to the present invention, it is possible to manufacture a product in which the skin material and the resin are integrally molded by the same mold, or a product containing only the resin.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of the mold according to the present invention in an initial state in which the mold is opened, showing a state in which a skin is not integrally molded.

FIG. 2 is an explanatory cross-sectional view showing a state where resin has been injected and the mold has started to be tightened.

FIG. 3 is a cross-sectional clear view showing a mold clamping operation state in a compression process.

FIG. 4 is a cross-sectional explanatory diagram at the time of completion of compression.

FIG. 5 is a cross-sectional explanatory view of the mold according to the present invention in an initial state in which the mold is opened and shows a state in which the outer skin is integrally molded.

FIG. 6 is an explanatory cross-sectional view showing a state in which resin has been injected and the mold has started to be tightened.

FIG. 7 is a cross-sectional view showing a mold clamping operation state in the compression step.

FIG. 8 is an explanatory cross-sectional view when compression is completed.

FIG. 9 is an explanatory diagram of a resin seal frame.

FIG. 10 is an explanatory diagram of a skin material holding frame.

FIG. 11 is an explanatory diagram of a stop portion of the skin material holding frame.

[Explanation of symbols]

 10 First Mold 12 Gate 13 Guide Recess 14 Through Hole 15 Cylinder Device 16 Rod Valve 20 Second Mold 21 Mold Surface 22 Recess 23 Movable Recess 25 Passage 30 Resin Seal Frame 31 Contact Surface 32 Sliding Contact 33 Holding Frame movable range 35 Means for sliding the resin seal frame in the mold clamping direction 35a Through hole 35b Recessed portion 35c Guide rods 35d, 35e Spring 40 Skin material holding frame 41 Main body 41a Stop portion 41b Guide recessed portion 41c Holding hole 42 Skin material locking Member 43 Movable means 44 Guide part 45 Holding member 45a Engagement hole 46 Guide rod 46a Locking part 47 Spring K Cavity J Synthetic resin H Skin material

Claims (2)

[Claims] 1. A mold apparatus for resin press molding, wherein a cavity is formed by facing first and second molds, and a molten resin is injected between the facing molds and the mold is clamped. On the outer periphery of the first mold, a resin seal frame slidably arranged in the mold clamping direction, a skin material holding frame held at a constant distance from the second mold, and engaged with the skin material. And a skin material holding member that moves with the movement of the skin material, and the skin material locking member disposed on the outer periphery of the first mold in the second mold. A resin press molding die device, characterized in that a space for moving a member is formed. 2. A mold apparatus for resin press molding, wherein a cavity is formed by opposed first and second molds, a molten resin is injected between the opposed molds, and the mold is clamped. The outer periphery of the first mold includes a resin seal frame slidably arranged in the mold clamping direction, and a skin material holding frame arranged in association with the resin seal frame. The seal frame includes a contact portion that contacts the second die, a sliding contact portion that slidably contacts the first die, a holding frame movable range portion that allows the skin material holding frame to move, and a first die. A mold and a means for sliding in the mold clamping direction, the skin material holding frame comprises a skin material locking member and a moving means of the skin material locking member, and when the skin material is mounted Holds the skin material by the skin material locking member of the skin material holding frame, and moves the skin material locking member according to the movement of the skin material during mold clamping. A resin press molding die device, wherein the resin seal frame moves and comes into contact with the second die and moves together with the second die and the resin seal frame.