JP3391077B2 - How to set the net insert - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a net insert when holding the net insert in a mold and performing insert molding. Here, an airbag cover will be described as an example of an insert molded product using a net insert, but the present invention is not limited to this.

[0002]

2. Description of the Related Art As an airbag cover, there is one having a structure as shown in FIG.

The airbag cover 12 is constructed by a cover body portion 14 and a bracket portion 16 formed from a lower surface of the cover body portion 14 through a flexible hinge portion H.
Consists of. Usually, an insert is embedded in the cover body 14 to prevent scattering.

As the insert, it is considered that the net insert 18 is extended to the bracket portion 16 and embedded therein.

The net insert 18 is woven with a thread having high heat resistance and strength, which is made of polyamide fiber, aramid fiber (aromatic polyamide), or the like. The mesh size of the net insert 18 is usually 1 to
It is 3 mm.

As shown in the figure, the airbag cover 12 is attached to an opening 24a formed in the instrument panel 24 at a position directly above the airbag 22 held in the bag case 20. The bracket portion 16 is attached to the bag case 20 by means such as screwing. The free end side of the airbag cover 12 is a breakaway member (not shown).
The closed state of 2 can be maintained.

[0007]

When the airbag cover having the above structure is to be molded by injection molding using the movable mold 26 and the fixed mold 28, it is necessary to set the net insert in the movable mold. There is.

In this case, it is difficult to mechanize the setting of the net insert on the movable product cavity surface and to automatically convey and feed the net insert to the movable mold. This is because the net insert 18 is soft and has no shape-retaining property, and since it is perforated, it cannot be sucked and conveyed by a vacuum pad or the like.

Further, if the specification (particularly the length) of the net insert changes, it is necessary to change the cutting length of the supply net insert each time, which is troublesome. In addition, when trying to use the net inserts of the same length, material loss occurs.

An object of the present invention is to provide a method for setting a net insert which facilitates mechanization of setting the net insert on a movable die.

Another object of the present invention is to provide a method of supplying a net insert, which can easily automatically convey and supply the net insert when setting the net insert in a movable die, and can easily cope with a change in the specifications of the net insert. To provide.

[0012]

[Means for Solving the Problems]

(1) A method for setting a net insert according to a first aspect of the present invention solves the above problem by the following configuration.

In insert molding, a method of setting a net insert in a movable mold, in which the upper end of the net insert is grasped and hung by an insert conveying member having a chuck mechanism, and in that state, the lower end of the net insert is held. The (remaining part) is suspended and inserted into a gap formed between the movable die and the slide core at the time of retreating, and after being pressed and sandwiched by the movable die and the slide core, the insert gripping of the insert conveying member is released, and the net insert is inserted. It is characterized by setting the movable type.

(2) A method for supplying a net insert according to a third aspect of the present invention is to solve the above problems by the following constitution.

A method for feeding a net insert up to a movable type used in the method for setting a net insert according to the present invention, wherein a roll-shaped insert net (hereinafter simply referred to as "net") is fed in the horizontal direction. After that, guide it upward with a guide roller, grasp the tip of the net and pull it upward, hold the upper side of the site to be cut with the insert conveying member while the net is stretched, and lower the site to be cut. A net insert is prepared by cutting while holding the side, and the net insert is gripped and suspended by an insert transport member and transported to a movable insert set position,
It is characterized by including each step of.

[0016]

The present invention will be described in detail below with reference to FIGS. The same parts as those in the above-described example are designated by the same reference numerals, and the description thereof will be omitted in whole or in part.

(1) The structure of the airbag cover 12 to which the molding method of the embodiment is applied will be outlined again.

The airbag cover 12 is similar to the above-mentioned example.
The net insert 18, which is composed of the cover body portion 14 and the bracket portion 16 and is embedded in the cover body portion 14, extends to the bracket portion 16.

(2) The molding die used in the molding method of the embodiment is usually for injection molding.
As shown in FIG. 2, it has a configuration including a movable die 26 and a fixed die 28.

First, the movable mold 26 is provided with a slide core 32 which forms a product part cavity 30 in cooperation with the movable mold 26 in a mold closed state and reciprocally slides a molded product (product) so that it can be released. Has been done. A runner portion (sprue runner gate) 38 for pouring a molding material is located so as to be connected to the end of the base portion of the cover body shaping portion 30b.

Here, the movable die 2 of the net insert 18
The setting to 6 is performed as follows.

The upper end portion of the net insert 18 is grasped by an insert conveying member having a conveying clamp (chuck mechanism) 34 and is hung and conveyed to the set position of the movable die 26.

In this state, the lower end portion of the net insert 18, that is, the surplus portion 18a, is suspended and inserted into the gap S formed between the movable die 26 and the slide core 32 when retracted.

Subsequently, the slide core 32 is moved forward, and the excess portion 18a of the net insert 18 is pressed and sandwiched by the movable die 26 by the slide core 32.
Then, the net insert 18 is set in the product cavity 30 of the movable mold 26 by being locked by a set pin (not shown).

At this time, when the net insert 18 is pulled to the tip side of the cover body-attached space 30b to reach a predetermined position, the chuck mechanism 34 is released and then set, in the case of setting without tension. Compared with the above, it is preferable that the net insert 18 is less likely to be displaced from the set position of the movable die 26 in the product cavity.

Subsequently, the movable mold 26 is raised to close the mold, and the molding material is injected and cured in the product cavity 30 via the runner (sprue / runner / gate) 38. As a molding material for the airbag cover,
Usually, a soft synthetic resin material such as a thermoplastic elastomer is used.

The molded product (airbag cover) molded in this way is adsorbed by a suction plate attached to a take-out machine (not shown), conveyed to a conveyor and placed thereon, and conveyed to a predetermined collection place by the conveyor. .

After that, finishing processing such as removal of the excess portion of the net insert, removal of burrs, coating, and attachment of parts is performed.

(3) Supply of the net insert 18 to the movable type used in the above method of setting the net insert is
The following method is preferable because it facilitates automatic feeding and feeding of the net insert (see FIG. 5). In the illustrated example, a pair of the chuck 50 of the pulling member and the clamp 55 of the insert conveying member are described as an example so as to correspond to the two-molding molding die, but the present invention is not limited to this. Without the chuck 50 and the pressing plate 58,
The number may be one, or three or more.

As shown in the figure, a roll-shaped insert net (hereinafter simply referred to as "net") 40 is fed out in the horizontal direction and then guided upward by a guide roller 42. Here, the accumulator mechanism 44 is provided between the feeding position of the roll-shaped net insert 40 and the guide roller 42.
It is desirable that the net 40 be provided so that an unreasonable tensile force does not act on the net 40.

In the illustrated example, the accumulator mechanism 44 is
A pair of support rolls 46 and 4 arranged side by side in the net conveying direction
6, and an air cylinder 48 between the support rolls 46, 46.
However, other general-purpose accumulator mechanism or the like may be used.

Next, the tip (upper end) of the net 40 is pulled up by grasping the tip of the net 40 with the insert pulling member 52 having the chuck 50. The chuck 50 is not limited to the one shown in the figure, and another general-purpose chuck mechanism may be used.

In the illustrated example, the pair of chucks 50 are vertically moved simultaneously by an air cylinder 51 and a forked arm 53. The chuck 50 can be inserted between the transport clamps 34 (in the open state) of the insert transport member 54. With the net 40 pulled up, the upper and lower sides of the planned cutting portion are cut by the cutting blade 57 while being held by the carrying clamp 34 of the insert carrying member 54 and the lower clamp member 56, respectively. Then, the net insert 18 is prepared. In addition, before the cutting, the chuck 50 of the insert pulling member 52 is opened.

Here, it is desirable that the transport clamp 34 is a plate clamp (face clamp) so as not to be bent and deformed by the cutting blade 57 during cutting. That is, the insert conveying member 54 is composed of a pressing plate 58 and a receiving plate 60, and the pressing plate 58 is driven by an air cylinder 62 arranged on the receiving plate 60 side.

The lower clamp members 56 are each driven by an air cylinder 64, and the pair of clamp bars 6 facing each other.
It is composed of 0 and 0.

In the illustrated example, the cutting blade 57 is of a cut-off type in which the pedestal 66 is opposed to the other side, but a shearing type, a knife cutter type or the like may be used.

The insert transfer member 54 is an air cylinder 68 which moves the transfer clamp 34 up and down, and the air cylinder 68 is formed on a transfer arm 72 running on a transfer rail 70 arranged in the molding die direction. Long hole 7
4 is slidably held. This is to take two inserts 18 and to adjust the position when setting the mold.

In this embodiment, the transport clamp 34 is used.
Although the chuck 50 of the net lifting member 52 is separately provided, it may be configured to be used in combination. The net insert 18 is grasped and hung by the insert conveying member 54 and conveyed to the movable insert set position. That is, the transport clamp 3 of the insert transport member 54
While the net insert 18 is clamped (gripped) at 0, the transfer arm 74 is moved to transfer the net insert 18 to the position of the movable die 26. Net insert 1
When 8 reaches the set position, the air cylinder 68 of the insert conveying member 54 is moved within the elongated hole 74 of the conveying arm 72, and the like, in the same manner as described above.
Open the transport clamp 34 of the net insert 18
Is set on the movable mold 26.

[0039]

[Operation and effect of the invention]

(1) In the method for setting a net insert according to the first aspect of the present invention, the upper end portion of the net insert is grasped and hung by an insert conveying member having a chuck mechanism, and in that state, the lower end portion (remaining portion) Part) is suspended and inserted into a gap formed between the movable die and the slide core at the time of retreating, and is clamped by the movable die and the slide core, and then the insert grip of the insert conveying member is released to set the net insert. With such a configuration, the insert can be reliably set without shifting, and it becomes easy to mechanize the setting of the net insert to the movable die.

(2) In the method for supplying the net insert of the present invention according to claim 3, the roll-shaped net is unrolled in the horizontal direction and then guided upward by a guide roller, and the tip of the net is grasped. Pull up, the net, while gripping the upper side of the planned cutting site with the insert transport member, gripping and cutting the lower side of the planned cutting site, to prepare a net insert, the net insert,
With a configuration that includes each process of gripping and suspending with an insert transport member and transporting it to the movable die insert setting position, even when it is a net, it is easy to automatically transport and insert the net insert when setting the net insert to the movable die It is also possible to easily change the specifications of the net insert.

[Brief description of drawings]

FIG. 1 is a sectional view of a mounting mode of an airbag cover to which the present invention is applied.

FIG. 2 is a schematic sectional view of a molding die to which the net insert setting method of the present invention is applied.

3 is a schematic cross-sectional view showing a state where a net insert is suspended and inserted between a slide core and a movable mold by using the mold of FIG.

FIG. 4 is a schematic cross-sectional view showing a state in which the net insert is clamped between the slide core and the movable mold using the mold of FIG. 2 and then pulled to the tip side of the cover main body attachment part.

FIG. 5 is a schematic perspective view of an apparatus used in the net insert supply method of the present invention.

[Explanation of symbols]

12 airbag cover 14 Airbag cover cover body 16 Airbag cover bracket 18 Net Insert (Flexible Insert) 18a Net insert remainder 26 Movable type (lower type) 28 Fixed type (upper type) 30 product cavities 32 slide core 34 Transport clamp (chuck mechanism) 40 Insert Net 42 Guide roller 52 Insert lifting member 54 Net insert transport member 56 Lower clamp member 57 cutting blade 70 Conveyor rail 72 Transport arm

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60R 21/16-21/32 B29C 33/12 B29C 45/14

Claims (5)

(57) [Claims] 1. A method of setting a net insert in a movable mold in insert molding, wherein an upper end portion of the net insert is grasped and hung by an insert conveying member having a chuck mechanism, and the net insert is held in that state. The lower end (remaining part) of the insert is suspended and inserted into the gap formed between the movable die and the slide core when retracted, and after it is pressed and sandwiched by the movable die and the slide core, the insert grip of the insert conveying member is released. , A method of setting a net insert, characterized in that the net insert is set to a movable type. 2. The method for setting a net insert according to claim 1, wherein the gripping of the insert of the insert conveying member is released to the tip side of the movable product cavity. 3. A method for supplying a net insert up to a movable die used in the method for setting a net insert according to claim 1, wherein a roll-shaped insert net (hereinafter simply referred to as “net”) is horizontally provided. After feeding out, guide upward with a guide roller, grasp the tip of the net and pull it up, grasp the upper side of the planned cutting site and the lower side of the planned cutting site with the insert transport member A net insert supply method comprising the steps of: cutting in a state to prepare a net insert; gripping and suspending the net insert by an insert carrying member and carrying it to a movable insert set position. 4. The net insert supply method according to claim 3, wherein an accumulator mechanism is arranged between the feeding position of the roll-shaped net insert and the guide roller. 5. The method for supplying a net insert according to claim 3, wherein a habit removing heating means is provided between the guide roller and the lower gripping means.