JP2019059215A - Resin molding - Google Patents

Abstract

To reduce a step generated on a back surface side between a first molded body and a second molded body to reduce the thickness of a resin molding and enhance installation workability of the resin molding or peripheral members.SOLUTION: Provided is a resin molding 1 having a first molded body 2 and a second molded body 3 provided with a decorative part 3a being exposed from a design surface of the first molded body 2. In a boundary portion between the back surface of the first molded body 2 and the back surface of the second molded body 3, the second molded body 3 is provided such as to be embedded from the back surface of the first molded body 2 in the thickness direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resin molded article in which a decorative portion of a second molded body is exposed from a design surface of the first molded body.

  For example, for the purpose of improving the design of a vehicle interior member used for a car or the like, a resin molded product in which a stitch pattern such as a seam of a thread is reproduced has been proposed.

  As shown in FIG. 9, the resin molded product having a stitch pattern is generally exposed from the design surface of the first molding 112 and the first molding 112 constituting the main part of the design surface, and is a stitch pattern And a second molded body 110 provided with a projecting shaped decorative portion 110a (see Patent Document 1).

JP, 2016-147497, A

  Here, in the resin molded product shown in FIG. 9, a level difference M is generated between the back surface of the first molded body 112 and the back surface of the second molded body 110. Such a level difference may hinder the installation operation of the resin molded product and the installation operation of the peripheral members. For example, in the case where the resin molded product is an instrument panel installed in a vehicle compartment such as a car, when installing the harness by putting it on the back side, the harness is caught on the step of the instrument panel Can be a hindrance to Moreover, since the resin molded product with such a level | step difference increases in thickness by the part | minute of a level | step difference, improvement is desired in the application to the product in which size reduction is calculated | required especially.

  Therefore, the present invention reduces the difference in level between the first molded body and the second molded body on the back side to reduce the thickness of the resin molded product, and at the same time installing the resin molded product or its peripheral members. Intended to improve gender.

  In order to solve the above problems, the present invention is a resin molded article having a first molded body and a second molded body provided with a decorative portion exposed from a design surface of the first molded body, The resin molded product is provided such that the second molded body is embedded in the thickness direction from the back surface of the first molded body at the boundary between the back surface of the first molded body and the back surface of the second molded body. Do.

  Thus, at the boundary between the back surface of the first molded body and the back surface of the second molded body, the second molded body is provided so as to be embedded in the thickness direction from the back surface of the first molded body. It is possible to reduce the step on the back surface side that occurs between the one molded body and the second molded body.

  According to the present invention, it is possible to reduce the step on the back surface side which occurs between the first molded body and the second molded body, so that the thickness of the resin molded product can be reduced, and the resin molded product or peripheral members thereof Installation workability can be improved.

It is a perspective view of the panel concerning one embodiment of the present invention. It is a figure which shows each part cross-sectional shape of the panel shown in FIG. 1, Comprising: (A) is an AA cross section of FIG. 1, (B) is a BB cross section of FIG. It is sectional drawing of the metal mold | die apparatus for shape | molding the panel shown in FIG. 1, Comprising: (A) is sectional drawing of the location corresponding to FIG. 2 (A), (B) respond | corresponds to FIG. 2 (B). It is sectional drawing of a location. It is sectional drawing which shows the modification of a metal mold | die apparatus. It is a figure for demonstrating the formation method of the panel shown in FIG. It is a figure for demonstrating the formation method of the panel shown in FIG. It is a figure for demonstrating the formation method of the panel shown in FIG. It is a figure for demonstrating the formation method of the panel shown in FIG. It is a perspective view of the conventional resin molded product.

  Hereinafter, a resin molded product according to an embodiment of the present invention will be described by taking an instrument panel installed in a front portion of a vehicle compartment such as a car as an example. However, the resin molded product according to the present invention is not limited to the instrument panel. For example, the present invention can be applied to other vehicle interior members such as door trims and console boxes, and resin molded products used other than vehicles.

  FIG. 1 is a perspective view of an instrument panel (hereinafter simply referred to as “panel”) according to the present embodiment, and FIG. 2 is a view showing a sectional shape of each part of the panel shown in FIG. 1A is a cross-sectional view of FIG. 1, and FIG. 1B is a cross-sectional view of FIG.

  As shown in FIGS. 1 and 2, the panel 1 is configured of a first molded body 2 and a second molded body 3 which are molded with resin materials of different colors. In FIG. 1, the front side of the panel 1 is a design surface. The second molded body 3 is disposed on the back surface side opposite to the design surface of the first molded body 2 so as to be laminated. The second molded body 3 is intermittently provided with a plurality of projected streaks 3 a as a decorative portion, and these projected streaks 3 a are exposed from the design surface of the first molded body 2, On the design surface of the first molded body 2, a stitch pattern as sewn with a thread is formed. In the present embodiment, the plurality of protrusions 3 a are disposed along the groove 2 a formed in the design surface of the first molded body 2.

  Further, the protruding portion 3a is integrally provided on the base portion 3b of the second molded body 3 which is formed wider than the protruding portion 3a. The base portion 3b is continuously provided in the direction in which the ridges 3a are arranged, and the back surface is a convex curved surface (the surface on the design side) of the ridges 3a at the location where the ridges 3a are provided. It is molded to be a concave surface by copying. On the other hand, in the other places, the back surface of the base portion 3b is formed to be flat.

  In addition, the base portion 3b has a thickness from the back surface of the first molded body 2 at least at a boundary portion between the back surface of the first molded body 2 and the back surface of the second molded body 3 (a portion surrounded by an alternate long and short dash line in FIG. 2). It is provided to be embedded in the direction. For this reason, the recessed part 2b in which the base part 3b is embedded is provided in the back surface of the 1st molded object 2. As shown in FIG.

  Thus, in the present embodiment, unlike the configuration shown in FIG. 9 described above, the second molded body 3 (base portion 3 b) is formed at the boundary between the back surface of the first molded body 2 and the back surface of the second molded body 3. Is provided so as to be embedded in the thickness direction from the back surface of the first molded body 2, so that the step on the back surface side that occurs between the first molded body and the second molded body as compared with the configuration shown in FIG. Can be reduced or eliminated. As a result, the peripheral members such as the harness are less likely to be caught by the step on the back surface side of the panel, so the installation operation of the peripheral members and the panel installation operation can be easily performed, and the workability can be improved. In addition, the thickness of the panel can be reduced by reducing the step on the back surface side which occurs between the first molded body and the second molded body, so application to a product requiring compactness is advantageous. In particular, as shown in FIG. 1 and FIG. 2, by making the level difference completely disappear between the back surface of the first molded body 2 and the back surface of the second molded body 3, It is preferable because the effects of improvement and compactness can be obtained remarkably.

  In addition, even if a level difference is generated on the back surface side, if the level difference can be reduced to a certain extent by providing the second molded body so as to be embedded in the thickness direction from the rear surface of the first molded body, certain effects can be obtained. Can be expected. Accordingly, the present invention is not limited to the configuration in which there is no level difference on the back side, but also includes the configuration in which there is level difference.

  Subsequently, a mold apparatus and a molding method for molding a panel according to the above-described embodiment will be described.

FIG. 3 is a cross-sectional view of the mold apparatus.
The cross sections of the mold apparatus shown in FIGS. 3A and 3B correspond to the cross sections of the panel shown in FIGS. 2A and 2B.

  As shown in FIG. 3, the mold apparatus 4 includes an upper mold 5 as a first mold for molding the design side of the panel and a lower mold 6 as a second mold for molding the back side of the panel. Prepare.

  The upper mold 5 has a design forming surface 5a for forming the main part of the design surface, a pair of inclined surface portions 5b for forming both side surfaces of the groove portion 2a, a flat surface portion 5c for forming the bottom portion of the groove portion 2a, and a ridge portion 3a. And a recess 5d for forming the The pair of inclined surface portions 5b are inclined so as to approach each other downward. The flat surface portion 5c and the recessed portion 5d are disposed between the pair of inclined surface portions 5b, and are provided so as to be continuous with the end portions of the respective inclined surface portions 5b. Further, the inner surface of the recess 5d is inclined so as to spread from the bottom 5d1 toward the opening edge 5d2.

  The lower mold 6 has a main mold 7 and a slide mold 8 provided slidably with respect to the main mold 7. The slide mold 8 is configured to approach and move away from the upper mold 8 by sliding movement in the vertical direction. On the upper surface of the slide die 8, a pair of inclined surface portions 8b opposed to the pair of inclined surface portions 5b of the upper mold 5, a flat surface portion 8c opposed to the flat surface portion 5c of the upper mold 5, and a recessed portion 5d of the upper mold 5 Convex portion 8d is provided. The pair of inclined surface portions 8b of the slide mold 8 are inclined so as to be separated from each other upward, and the flat surface portions 8c are provided in a substantially horizontal direction. The convex portion 8 d is formed in the same shape as the inner surface of the concave portion 5 d (so as to match the inner surface shape).

  As shown by the alternate long and two short dashes line in FIG. 3, in a state where the slide mold 8 ascends and approaches the upper mold 5, the convex portion 8 d of the slide mold 8 is inserted into the concave portion 5 d of the upper mold 5 and the outer surface of the convex portion 8 d Are disposed in contact with the entire inner surface of the recess 5d. On the other hand, the pair of inclined surface portions 8b and the flat surface portions 8c of the slide mold 8 are disposed in a state of not being in contact with the pair of inclined surface portions 5b and the flat surface portions 5c of the upper die 5 via a gap.

  As described above, in a state where the slide mold 8 is raised and the convex portion 8 d of the slide mold 8 contacts the entire inner surface of the concave portion 5 d of the upper mold 5, the concave portion 5 d is sealed by the convex portion 8 d. That is, the convex part 8d of the slide mold 8 functions as the sealing part 9 which seals the concave part 5d by contact with the concave part 5d.

  Further, unlike the present embodiment, as in the example shown in FIG. 4, the convex portion 8 d may be cut at the upper portion. In this case, the convex portion 8d is not in contact with the bottom portion 5d1 of the concave portion 5d, and is in contact with the inner peripheral portion of the opening edge 5d2 of the concave portion 5d, whereby the concave portion 5d is sealed. With such a configuration, it is not necessary to make the shape of the convex portion conform to the shape of the entire inner surface of the concave portion, so that the concave portion is sealed even without manufacturing or positioning the mold with high accuracy. Is possible.

  In order to form a panel using the mold apparatus, first, as shown in FIG. 5, the upper mold 5 and the lower mold 6 are clamped, and the upper mold 5 and the lower mold 6 are brought into contact with each other. Further, in this state, the slide mold 8 is disposed at a position close to the upper mold 5 so that the convex portion 8 d (sealing portion 9) of the slide mold 8 against the inner surface of the concave portion 5 d of the upper mold 5. Touch. Thereby, the recess 5 d is sealed. As a result, a first cavity 11 not in communication with the recess 5 d is defined between the upper mold 5 and the lower mold 6.

  Then, as shown in FIG. 6, the first resin material softened by heating is filled into the first cavity 11 while applying pressure by the injection molding machine. At this time, since the concave portion 5d is sealed by the convex portion 8d, the first resin material is prevented from entering the concave portion 5d. Thereafter, the first resin material is cooled and cured to form the first molded body 2.

  Next, as shown in FIG. 7, with the first molded body 2 remaining in the first cavity 11, the slide mold 8 is lowered to separate the slide mold 8 from the upper mold 5. As a result, the contact between the convex portion 8 d (sealing portion 9) of the slide mold 8 and the concave portion 5 d of the upper mold 5 is released, and the concave portion 5 d is opened. As a result, a second cavity 12 is defined between the upper mold 5 and the lower mold 6 in which the area formed by lowering the slide mold 8 and the recess 5 d communicate with each other.

  Then, as shown in FIG. 8, the second resin material softened by heating is filled into the second cavity 12 while applying pressure by the injection molding machine. Thereafter, the second resin material is cooled and cured to form the second molded body 3 having the plurality of protruding portions 3a. Then, the upper mold 5 and the lower mold 6 are opened, and the resin molded product is released to obtain a panel in which the first molded body 2 and the second molded body 3 are integrated.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

  In the description of each of the above-described embodiments, as a mold for molding a resin molded article, the first mold for molding the design surface side of the resin molded article is the upper mold, and the second mold for molding the back side of the resin molded article Although the case where a mold is a lower mold was mentioned as an example, arrangement of the first mold and the second mold may be upside down, or may be arranged left and right.

  Moreover, the resin molded product which concerns on this invention is not restricted to what consists of a resin material from which a color mutually differs. The present invention can also be applied to resin molded articles formed of resin materials of different types such as texture and hardness other than color.

  Furthermore, the present invention is not limited to the resin molded product which constitutes a stitch pattern by intermittently providing the above-mentioned ridges. For example, the decorative portion of the second molded body exposed from the design surface of the first molded body may be a decorative portion extending continuously and linearly, or may be a flat surface-like additional portion which does not protrude to the design surface side It may be a decorative part.

1 instrument panel 2 first molded body 3 second molded body 3a ridge portion (decored portion)
4 Mold device 5 Upper mold (first mold)
5d Recess 6 Lower mold (second mold)
7 main mold 8 slide type 8d convex part 9 sealing part 11 first cavity 12 second cavity

Claims (1)

A resin molded article having a first molded body and a second molded body provided with a decorative portion exposed from a design surface of the first molded body,
The second molded body is provided so as to be embedded in the thickness direction from the back surface of the first molded body at the boundary between the back surface of the first molded body and the back surface of the second molded body. Resin molded products.

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