JP2008055764A - Composite resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite resin molding which is produced by inserting a hard resin plate into a mold and injecting a resin material of a rate of shrinkage different from that of the hard resin plate into the mold to mold the bulk resin section and the hard resin plate in an integrated form and controls sinks, uneven luster, etc. occurring on the surfaces of joints of the hard resin plate and the bulk resin section. <P>SOLUTION: A pillar garnish (composite resin molding) 10 consists of a garnish body (the bulk resin section) 20 formed by injection molding of a soft resin and a hard resin plate 30 inserted preliminarily into the mold. A rapid flow of resin in the joints during molding of the garnish body 20 is controlled by forming a section 34 varying gradually in the thickness of the plate in the edge part of the hard resin plate 30, which enables clearance of defects of the appearance, e.g. sinks and uneven luster from the surface of the product. The occurrence of sinks and uneven luster on the surface of the product is also controlled by making the thin hinge section 21 of the garnish body 20 in the shape of a gently sloping V groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite resin molded article suitable for automobile interior parts and the like, and in particular, a hard resin plate having a high rigidity is inserted into a molding die, and a soft resin is injected and filled into the mold. It is a composite resin molded product that is formed by molding the main body resin part integrally with the resin plate, and in particular, appearance defects such as sink marks and uneven gloss on the product surface at the joint between the hard resin plate and the main body resin part during molding. The present invention relates to a composite resin molded product excellent in appearance performance.

  For example, as shown in FIG. 12, a pillar garnish 3 is mounted on the interior side of a back pillar panel (not shown) that defines a quarter window opening 1 and a back door opening 2, and this pillar As shown in FIG. 13, the garnish 3 employs a composite resin molded product including a garnish body 4 made of a soft resin and a hard resin plate 5 having a high rigidity. As a procedure for manufacturing the pillar garnish 3, a hard resin plate 5 is inserted into a molding die, a soft resin material is injected and filled into a cavity of the molding die, and the garnish body 4 is molded into a required shape. Thus, it is molded as a simultaneous molded product. As the hard resin plate 5, PP (polypropylene) resin, PPC resin (resin in which a filler such as talc is mixed in polypropylene resin) is used, and as the garnish body 4, TPO (thermoplastic olefin) resin, PVC resin or the like is used. The soft resin is used.

  The hard resin plate 5 has a clip mounting seat 5a for mounting on the pillar panel and mounting pieces 5b extending from the upper and lower ends, and mounting holes 5c are formed in the mounting pieces 5b. 14 and 15 show the cross-sectional structure of the pillar garnish 3, so that when the airbag device 6 provided therein is deployed, the garnish body 4 also follows the deployment. A hinge portion 4a serving as a starting point at the time of deployment is formed. As described above, the pillar garnish 3 is molded by inserting the hard resin plate 5 previously molded into a required shape into the molding die and injecting the molten resin into the cavity of the molding die. By filling, the garnish main body 4 is formed into a required shape, and the hard resin plate 5 and the garnish main body 4 having different shrinkage rates are integrated. The relationship between the garnish main body 4 and the hard resin plate 5 in the pillar garnish 3 is constant as shown in FIG. 14, so that the thickness of the garnish main body 4 at the portion wrapping with the hard resin plate 5 is thin. In particular, as shown in FIG. 15, the portion where the stress is applied is such that the end portion of the hard resin plate 5 is held by a hook-like holder portion 4b integrated with the garnish body 4, as shown in FIG. Yes. The configuration and the molding method of the pillar garnish 3 incorporating the airbag device 6 are described in detail in Patent Document 1.

JP 2005-306219 A

  Thus, the pillar garnish 3 ensures a strong mounting strength to the vehicle body panel and has a contraction rate between the hard resin plate 5 and the soft garnish body 4 so as to follow the deployment operation of the airbag device 6. Composite resin molded products using two different types of materials are adopted, and the hard resin plate 5 is integrated by inserting the hard resin plate 5 into the molding die and injection molding the garnish main body 4. Since the plate thickness of the garnish body 4 changes abruptly at the edge portion 5, appearance defects such as sink marks and gloss unevenness are likely to occur at the portions indicated by A 1 and A 2 in FIG. In such a case, a finishing process is added by post-coating, which raises a problem that the manufacturing cost is significantly increased.

  The present invention has been made in view of such circumstances, and is a composite resin molded product in which a hard resin plate is inserted into a molding die, and a soft resin is injected and filled. By sharply changing the thickness of the resin part at the edge, it is possible to prevent appearance defects such as sink marks and gloss unevenness from occurring on the product surface as much as possible. The object is to provide a composite resin molded product that can eliminate the process and bring about cost reduction.

  In order to solve the above-mentioned problem, the present inventor has made an ingenuity in the shape of the edge portion of the hard resin plate that is inserted in advance into the molding die, thereby making a sudden change in the thickness of the main body resin portion. The present invention has been completed by paying attention to the fact that occurrence of appearance defects such as sink marks and gloss unevenness can be suppressed on the surface of the main body resin part.

  That is, the present invention is a composite resin in which a hard resin plate is inserted into a molding die, a soft resin material is injected and filled into a cavity of the molding die, and a main body resin portion is integrated with the hard resin plate. In the molded product, the taper-shaped gradually changing thickness portion is formed at the edge of the hard resin plate, so that occurrence of sink marks, gloss unevenness, etc. on the product surface at the mating portion is avoided. It is characterized by.

  Here, as composite resin molded products, it is applied to various pillar garnishes such as front pillar garnish, center pillar garnish, rear pillar garnish, back pillar garnish, rear side trim, luggage side trim, etc. it can. The composite resin molded product is a resin molded product using at least two different resin materials. For example, when applied to a pillar garnish, a hard resin plate having mounting rigidity with respect to the pillar panel, and an airbag The garnish body is made of a soft resin that can be flexed and deformed following the unfolding movement of the body. The high rigidity of the hard resin plate ensures mounting rigidity to the vehicle body panel, and the garnish body is easily bent and deformed. Due to its nature, it easily follows the deployment operation of the airbag and does not impair the functionality of the airbag.

  PP resin or PPC resin (polypropylene resin mixed with filler such as talc) is used as the hard resin plate, and this hard resin plate has a clip mounting seat and mounting pieces with screw holes. It has become. Moreover, as a main body resin part to be molded by injecting and filling molten resin into a cavity of a molding die with a hard resin plate inserted, soft resin materials such as TPO (thermoplastic olefin) resin and PVC resin are suitable. . Further, as the plate thickness gradual change portion formed at the edge of the hard resin plate, the rate of gradual change is not abrupt and the effect is more gentle. As for the relationship between the main body resin portion and the hard resin plate, the thickness of the wrap portion in the main body resin portion may be made thin so that the entire thickness is constant, and the thickness of the main body resin portion is made constant. The thickness of the hard resin plate and the main body resin portion in the wrap portion can be set to be thicker than that of the main body resin portion alone.

  Next, the present invention is a composite resin in which a hard resin plate is inserted into a molding die, a soft resin material is injected and filled into a cavity of the molding die, and a main body resin portion is integrated with the hard resin plate. In the molded product, a thin hinge portion is formed as a starting point when the main body resin portion is bent and deformed, and both sides of the thin hinge portion are respectively set as plate thickness gradually changing portions and extended to this portion. The edge part of the hard resin plate is provided with a tapered plate thickness gradually changing portion.

  And as a thin hinge part provided in a main body resin part, thickness does not change abruptly, but it is formed in the gentle V-groove shape as a hinge part which provided the board thickness gradual change part on both sides. When the hard resin plate is wrapped around this portion, it is preferable to set a plate thickness gradual change portion where the thickness gradually decreases toward the terminal even at the edge of the hard resin plate. The main body resin portion is integrally formed with a holder portion for holding a thin hinge portion and an edge portion of the hard resin plate.

  As described above, according to the present invention, since the thickness of the edge of the hard resin plate is gradually changed in the mating portion of the main body resin portion and the hard resin plate, when the main body resin portion is molded, it is abrupt. Resin flow does not occur, and appearance defects such as sink marks and gloss unevenness do not occur on the surface of the main body resin portion at the mating portion.

  Furthermore, when setting the thin-walled hinge part in the main body resin part, the configuration is adopted in which the plate thickness on both sides of the thin-walled hinge part is gradually changed, and the hard resin plate is extended to this part while gradually changing the thickness. Therefore, sink marks, uneven gloss, etc. do not occur on the product surface corresponding to the thin hinge portion.

  In this way, there is no sink or gloss unevenness on the product surface corresponding to the mating part of the main body resin part and the hard resin plate and the product surface corresponding to the thin hinge part, so that the appearance performance can be maintained well. Additional processes such as post-coating can be abolished.

  As described above, the composite resin molded product according to the present invention is obtained by inserting a hard resin plate having excellent rigidity into a molding die and injecting and filling a soft resin material into a product cavity in the molding die. In the composite resin molded product formed by integrally molding the main body resin portion made of a soft resin integrally with the hard resin plate, in particular, by gradually changing the thickness of the edge portion of the hard resin plate, Since it is possible to reliably prevent the occurrence of sink marks, gloss unevenness, etc. on the product surface, it is possible to maintain good appearance performance and eliminate the need for a post-coating process, thereby having the effect of reducing costs.

  Further, in the configuration in which the thin hinge portion is formed in the main body resin portion, the thickness of both sides of the thin hinge portion is gradually changed, and the thickness of the hard resin plate extended to the thin hinge portion is also gradually changed. If adopted, there will be no sudden plate thickness change when molding the main body resin part, and appearance defects such as sink marks and gloss unevenness will not occur on the product surface corresponding to the thin hinge part. Since processing such as post-coating is not required, the production cost can be reduced and the cost can be reduced.

  Hereinafter, an example in which a composite resin molded product according to the present invention is applied to a pillar garnish will be described in detail with reference to the accompanying drawings. Note that the gist of the present invention is as described in the scope of claims, and the contents of the embodiments described below are merely examples of the present invention.

  1 to 5 show a first embodiment of the present invention. FIG. 1 is a perspective view of a pillar garnish to which a composite resin molded product according to the present invention is applied as viewed from the indoor side. FIG. 2 is a perspective view of the pillar garnish. FIG. 3 is a sectional view of the pillar garnish, FIG. 4 is a sectional view showing a terminal shape of a hard resin plate in the pillar garnish, and FIG. 5 is a sectional view showing a modification of the pillar garnish.

  In FIG. 1, a pillar garnish 10 is attached so as to cover a part of the indoor side of a back pillar panel (not shown) located between the quarter window opening 1 and the back door opening 2. As shown in FIG. 2, a composite resin molded product 10 is formed by integrating two members of the garnish main body 20 and the hard resin plate 30. The garnish main body 20 is made of a soft resin such as TPO (thermoplastic olefin) resin, PVC resin or the like. As the hard resin plate 30, a filler such as talc is mixed with PP resin or PPC resin (polypropylene resin). Operation of the airbag device 6 disposed inside the garnish body 20 is made of a soft resin, while securing rigidity and shape retention to the vehicle body panel by the hard resin plate 30. Sometimes it can be bent and deformed so as to follow the airbag device 6 and a good feel is ensured. As shown in the figure, the hard resin plate 30 has a clip mounting seat 31 formed substantially at the center. A clip (not shown) is mounted on the clip mounting seat 31 and press-fitted into the mounting hole of the back pillar panel. Thus, the pillar garnish 10 is fixed to the panel side. In addition, attachment pieces 32 are formed at the upper and lower ends of the hard resin plate 30, and attachment holes 33 are formed in the attachment pieces 32 on the left and right sides, and these are also attached to the attachment holes of the back pillar panel by screws or the like not shown. Tightened and fixed.

  And about the integrated structure of the hard resin board 30 and the garnish main body 20, the hard resin board 30 is inserted in the molding die, and the soft resin material is injected and filled in the cavity of the molding die, so that the garnish is obtained. The main body 20 can be integrally formed with the hard resin plate 30 to form the pillar garnish 10 that is a composite resin molded product. About this garnish main body 20, the thin hinge part 21 is set along the corner line extended up and down so that it can turn at the time of expansion | deployment of the airbag apparatus 6, and it is formed in the concave groove shape inside.

  By the way, the pillar garnish 10 according to the present invention has no appearance of sink marks, gloss unevenness, or the like at the site indicated by A1 in FIGS. It is characterized by improved performance. For this purpose, as shown in FIGS. 3 and 4, it is a structural feature that a plate thickness gradual change portion 34 is set at an end edge portion of the hard resin plate 30. That is, by setting the plate thickness gradual change portion 34 in the hard resin plate 30, when the soft resin is injected and filled at the time of molding the garnish main body 20, there is no sudden change in the plate thickness, so that the resin flow is maintained almost uniform. 2 and appearance defects such as sink marks and gloss unevenness do not occur at the position indicated by A1 in FIG. As the gradual change ratio of the plate thickness gradual change portion 34, as shown in FIG. 4, when the thickness direction displacement x is set to the length direction displacement x, x ≧ y is better, and the larger the ratio of x, The effect of suppressing the occurrence of sink marks and uneven gloss is high.

  Next, FIG. 5 shows a modified example. Similarly, although a plate thickness gradual change portion 34 is set at the edge of the hard resin plate 30 in the pillar garnish 10, in this modified example, the garnish body 20 is shown. The thickness of the wrap portion of the garnish body 20 and the wrap portion of the garnish body 20 and the hard resin plate 30 are variable. By forming the deformed portion 34, the degree of overall plate thickness change is alleviated, so that occurrence of sink marks, uneven gloss, etc. is prevented as much as possible on the surface of the pillar garnish 10 shown in A1 in the figure. be able to.

  FIGS. 6 to 11 show a second embodiment of the present invention, which is applied to a pillar garnish 10 mounted on a part of the back pillar panel on the indoor side as in the first embodiment. FIG. 6 is a perspective view of the pillar garnish 10, FIGS. 7 and 8 are cross-sectional views showing the configuration of the thin hinge portion in the pillar garnish, and FIGS. 9 to 11 show various modifications of the thin hinge portion in the pillar garnish. It is sectional drawing.

  Also in the second embodiment, the pillar garnish 10 is the same as the first embodiment in that the pillar garnish 10 is composed of a composite resin molded product including the garnish main body 20 and the hard resin plate 30. In the second embodiment, In addition, by devising the configuration in the vicinity of the thin hinge portion 21 in the garnish body 20, it is possible to prevent the appearance of defects such as sink marks and gloss unevenness on the product surface corresponding to the thin hinge portion 21 as much as possible. It is. Accordingly, the materials, the molding method, and the like of the garnish main body 20 and the hard resin plate 30 are the same as those in the first embodiment, and the description thereof is omitted here.

  In the second embodiment, as shown in FIGS. 7 and 8, the thin hinge portion 21 of the garnish body 20 is provided with plate thickness gradually changing portions 21a and 21b on the left and right sides, respectively, and the thin hinge portion 21 is gentle. When the garnish main body 20 is formed, the resin flow does not change abruptly, and it is possible to suppress the occurrence of sink marks, gloss unevenness, etc. on the product surface. Also for the edge portion of the hard resin plate 30 integrated with the inner surface of the plate 21, a plate thickness gradual change portion 35 is set, and the inner surface of the garnish body 20 is held so as to hold the edge portion of the hard resin plate 30. A holder portion 22 extending in a hook shape from the thin hinge portion 21 is formed.

  Thus, in 2nd Example, while making the thin hinge part 21 in the garnish main body 20 into a gentle V-groove shape, while eliminating the rapid change of the board thickness in the garnish main body 20, also about the hard resin board 30 Since the plate thickness gradually changing portion 35 is held by the holder portion 22 of the garnish body 20, there is no sink or gloss unevenness in the portion indicated by A2 in FIGS. 6 to 8, and the appearance performance can be maintained well. There is an advantage that processing such as post-coating can be abolished.

  Furthermore, as shown in FIG. 9, the structure which sets the flange part 36 to the hard resin board 30, and the board thickness of the garnish main body 20 as the board thickness gradual change part 35 formed in the hard resin board 30 as shown in FIG. Basically, the garnish is adopted such as setting the gradual change portion 35 having a shape corresponding to the gradual change portion 21b, or adopting a shape that eliminates the holder portion 22 on the garnish body 20 side as shown in FIG. It is only necessary to adopt a basic configuration in which the thin hinge portion 21 in the main body 20 is set to have a gentle V-groove shape and the plate thickness gradual change portion 35 is set in the end edge portion of the hard resin plate 30.

  Therefore, according to the second embodiment, since the hinge function of the thin hinge portion 21 in the garnish main body 20 is not impaired, the garnish main body 20 is based on the thin hinge portion 21 in accordance with the deployment operation of the airbag device 6. The thin-walled hinge portion 21 has a gentle V-groove shape and the edge portion of the hard resin plate 30 can be deformed into an unfolded shape without impairing the function of the airbag device 6. Therefore, the product surface corresponding to the thin-walled hinge portion 21 has no appearance defects such as sink marks and gloss unevenness, and the product appearance is further improved, and processing such as post-coating is unnecessary. It has the advantage that the manufacturing cost can be reduced.

  The first and second embodiments described above are applied to the pillar garnish 10 mounted on the interior side of the back pillar panel. However, the hard resin plate 30 is inserted into the molding die, and the main body resin portion is integrated. It can be applied to all composite resin molded products to be molded.

It is the external view which looked at the pillar garnish which applied the composite resin molding which concerns on this invention from the vehicle interior side. It is a perspective view which shows the pillar garnish which applied the composite resin molding which concerns on this invention. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is explanatory drawing which shows the shape of the edge part of the hard resin board in the pillar garnish shown in FIG. It is sectional drawing which shows the modification of a pillar garnish. It is a perspective view which shows the pillar garnish which applied the composite resin molding which concerns on this invention. FIG. 7 is a sectional view taken along line VII-VII in FIG. 6. It is an expanded sectional view which shows the structure of the thin hinge part vicinity in the pillar garnish shown in FIG. It is sectional drawing which shows the modification of the pillar garnish shown in FIG. It is sectional drawing which shows the modification of the pillar garnish shown in FIG. It is sectional drawing which shows the modification of the pillar garnish shown in FIG. It is explanatory drawing which shows the indoor side of the rear pillar of a vehicle. It is a perspective view which shows the conventional pillar garnish. FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13. It is the XV-XV sectional view taken on the line in FIG.

Explanation of symbols

1 Quarter window opening 2 Back door opening 6 Airbag device 10 Pillar garnish (composite resin molded product)
20 Garnish body (main body resin part)
21 Thin-walled hinge portions 21a, 21b Plate thickness gradually changing portion 22 Holder portion 30 Hard resin plate 31 Clip mounting seat 32 Mounting piece 33 Mounting hole 34, 35 Plate thickness gradually changing portion 36 Flange portion

Claims (2)

The hard resin plate (30) is inserted into the molding die, the soft resin material is injected and filled into the cavity of the molding die, and the main body resin portion (20) is integrated with the hard resin plate (30). In the composite resin molded product (10)
The taper-shaped gradually changing thickness portion (34) is formed at the edge of the hard resin plate (30), thereby avoiding the occurrence of sink marks and uneven gloss on the product surface at the mating portion. A composite resin molded product characterized by being. The hard resin plate (30) is inserted into the molding die, the soft resin material is injected and filled into the cavity of the molding die, and the main body resin portion (20) is integrated with the hard resin plate (30). In the composite resin molded product (10)
The main body resin portion (20) is formed with a thin hinge portion (21) serving as a starting point when bending and deforming, and both sides of the thin hinge portion (21) are set as plate thickness gradually changing portions (21a, 21b), respectively. In addition, the composite resin molded product is characterized in that a tapered plate thickness gradually changing portion (35) is provided at an edge portion of the hard resin plate (30) extending to this portion.

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