JP2019059214A - Resin panel component and method for manufacturing the same - Google Patents

Abstract

To provide a resin panel component formed by multicolor molding, which prevents deformation of a design surface of a primary molding.SOLUTION: A resin panel component (instrument panel 1) has a panel body 10 (primary molding) having a design surface 10a, a body part 22 having a design surface (decorative line 20a) adjacent to the design surface 10a of the panel body 10, and a decorative member 20 (secondary molding) having a fixed part 21 fixed to a rear face 10b of the panel body 10, where the panel body 10 and the decorative member 20 are integrally formed by multicolor molding. Among the panel body 10, a thickness T2 in a boundary B2 between a rear face 10b of the panel body 10 and a rear face of the decorative member 20 is thinner than a thickness T3 in a region (main part 10c) separated from the decorative member 20 rather than the boundary B2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resin panel component, and more particularly to a resin panel component formed by a multicolor molding method in which a primary molded body and a secondary molded body are molded in the same mold.

  In Patent Document 1 below, an interior part of an automobile formed by a so-called multi-color molding method in which a primary molded body and a secondary molded body made of different types of resins are integrally injection molded in the same mold (for example, Is shown. Specifically, first, as shown in FIG. 6, the upper mold 120 and the lower mold 130 are clamped and the slide mold 140 is brought into contact with the upper mold 120 to form a first cavity 150, The resin is injected into the first cavity 150 to form the primary molded body 102. Thereafter, as shown in FIG. 7, the slide mold 140 is separated from the upper mold 120 to form the second cavity 160, and the resin is injected into the second cavity 160 to form the secondary molded body 103. By the above, the resin panel component 101 which integrally has the primary molded object 102 and the secondary molded object 103 is formed.

  In the invention described in the document, the end portion of the first cavity 150 is tapered, so that the end portion of the primary molded body 102 formed in the first cavity 150 is cured early. Thus, when resin is injected into the second cavity 160 shown in FIG. 7, the resin is prevented from entering between the design surface 102 a of the primary molded body 102 and the upper mold 120, and the design of the primary molded body 102 is achieved. The obscuring of the parting line 104 between the surface 102 a and the design surface 103 a of the secondary molded body 103 is prevented.

JP, 2015-9449, A

  As described above, Patent Document 1 discloses a technique for preventing the obscuring of the parting line 104 of the design surface of the resin panel component 101 by reducing the thickness of the end portion of the primary molded body 102. There is. However, on the back surface (surface opposite to the design surface) of the resin panel component 101, even if some resin leakage occurs, it does not affect the appearance, so it has been considered that there is no particular problem.

  However, according to the verification of the present inventors, when resin panel parts are formed by multicolor molding, not only resin leakage near the boundary (parting line) on the design surface side between the primary molding and the secondary molding, but also the back surface It has become clear that resin leakage near the side boundary also becomes a problem. That is, when the resin is injected into the second cavity 160 as shown in FIG. 7, if the primary molded body 102 is not completely solidified, the molten resin P (between the back surface of the primary molded body 102 and the lower mold 130) The injection molding is applied to the molten resin P, whereby the primary molded body 102 is pushed to the design surface side (upper side in the drawing). As a result, a raised portion Q (shown by a dotted line in FIG. 7) may be formed on the design surface 102a of the primary molding 102 of the resin panel component 101 taken out of the mold.

  From the above circumstances, the present invention has an object to prevent deformation of a design surface of a primary molded product in a resin panel component formed by multicolor molding.

  In order to solve the above-mentioned subject, the present invention is fixed to the primary molding which has a design side, the main part provided with the design side which adjoins the design side of the primary molding, and the back of the primary molding. And a secondary molded body having a fixed portion, wherein the primary molded body and the secondary molded body are integrally formed by multicolor molding, wherein the primary molded body among the primary molded bodies A panel component is provided in which the thickness at the boundary between the back surface of the molded body and the back surface of the secondary molded body is thinner than the wall thickness in the area separated from the secondary molded body than the boundary.

  As described above, by thinning the thickness of the primary molded body at the boundary between the back surface of the primary molded body and the back surface of the secondary molded body, after injection molding of the primary molded body, the vicinity of the boundary is cured early. It can be done. Thereby, when the molten resin is injected into the second cavity for forming the secondary molded body, the deformation of the primary molded body in the vicinity of the boundary due to the injection pressure of the molten resin is suppressed, so the back surface of the primary molded body and the mold It is possible to prevent the molten resin from entering between them.

  From this, according to the present invention, a primary molded body having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molded body, and a fixing portion fixed to the back surface of the primary molded body. A method of manufacturing a resin panel component comprising: a secondary molded body having: a mold main body and one mold having a slide mold, and the other metal capable of coming into and coming off from the one mold. Forming a first cavity by clamping with a mold, and molding the primary molded body by injecting a resin into the first cavity; and sliding the slide mold relative to the mold body Forming a second cavity by separating from the other mold, and forming the secondary molded body by injecting a resin different from the resin of the panel main body into the second cavity. , Said first cavity Among them, a resin panel whose dimension in the panel thickness direction at the boundary between the molding surface of the slide mold and the molding surface of the mold body is smaller than the dimension in the panel thickness direction in the region separated from the slide mold than the boundary. It is also characterized as a method of manufacturing parts.

  As described above, according to the present invention, when forming a resin panel component by multi-color molding, resin leakage on the back surface of the resin panel component can be prevented, so that deformation of the design surface of the primary molded product due to this can be prevented. it can.

It is a perspective view of resin panel parts (instrument panel). (A) is XX sectional drawing of FIG. 1, (B) is YY sectional drawing of A figure. (A) And (B) is sectional drawing which shows the procedure which forms the panel main body and decorating member of resin panel components by two-color molding. It is sectional drawing of the resin panel components which concern on other embodiment. It is sectional drawing of the resin panel components which concern on other embodiment. It is sectional drawing which shows a mode that the conventional resin panel component is formed by two-color molding, and shows the process of shape | molding a primary molding. It is sectional drawing which shows a mode that the conventional resin panel component is formed by two-color molding, and shows the process of shape | molding a secondary molding.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

  FIG. 1 shows an instrument panel 1 of a vehicle as a resin panel component according to the present embodiment. The instrument panel 1 integrally includes a panel body 10 and a decorating member 20. The panel main body 10 has a design surface 10 a, and the decorative member 20 has a linear design surface (decorative wire 20 a) continuously extending along the design surface 10 a of the panel main body 10. In the illustrated example, the decorative line 20a extends substantially linearly along the vehicle width direction. The panel body 10 and the decorating member 20 are formed of different resins. Here, “different resins” are resins having different appearances such as color, gloss, texture, etc., and different base resins, and even if the base resins are the same, the types and blending ratios of the materials to be added are made different. Include those with different colors etc.

  The panel main body 10 includes a front portion 12 having a through hole, a recess, and the like to which an instrument, an audio, and the like are attached, and a smooth upper surface portion 13 having no through hole. In the example of illustration, near the upper end of the front part 12, the decoration member 20 provided with the decoration line 20a extended in a vehicle width direction is provided. The decorative line 20a may be provided, for example, at the upper surface portion 13 or at the boundary between the front surface portion 12 and the upper surface portion 13. In the following, for convenience of explanation, the extending direction of the decorative wire 20a {left and right direction in FIG. 2 (B)} is referred to as "longitudinal direction" and a direction orthogonal to the design surface 10a of the panel body 10 (vertical direction in FIG. Is referred to as “panel thickness direction”, and a direction perpendicular to both the longitudinal direction and the panel thickness direction {right and left direction in FIG. 2A} is referred to as “width direction”. In the panel thickness direction, the interior space side (the design surface 10a side) is referred to as "front side", and the opposite side is referred to as "back side".

  As shown in FIG. 2A, the decorative member 20 has a fixing portion 21 fixed to the back surface 10b of the panel main body 10, and a main body portion 22 having a decorative wire 20a. In the illustrated example, the fixing portions 21 are provided on both sides in the width direction of the main body portion 22. Specifically, the main body portion 22 has a curved surface shape convex toward the front side, and the flat fixing portion 21 extends outward in the width direction from the end portion on the back side in the panel thickness direction of the main body portion 22 There is. As described above, by fixing the fixing portion 21 provided on the decorative member 20 to the panel main body 10, the fixed area of the decorative member 20 and the panel main body 10 regardless of the shape, size, etc. of the decorative wire 20a. Can be secured, so that both can be firmly fixed.

  The panel main body 10 has a main portion 10c constituting most of the design surface 10a and a thin portion 10d provided in the vicinity of the decorative wire 20a. In the example of illustration, the thin part 10d is provided continuously in the decoration line 20a side (width direction inner side) of the main part 10c. The main portion 10c has a plate shape having a substantially uniform thickness in the panel thickness direction. The thin portion 10 d is thinner than the main portion 10 c in the panel thickness direction. Specifically, the thickness T1 of the panel body 10 at the boundary B1 of the surface side (the design surface side) of the panel body 10 and the decoration member 20, and the back side of the panel body 10 and the decoration member 20 (design The thickness T2 of the panel body 10 at the boundary B2 opposite to the surface is smaller than the thickness T3 of the main portion 10c. In the illustrated example, the thickness in the panel thickness direction of the thin portion 10d of the panel main body 10 gradually becomes thinner toward the decorative wire 20a side (inward in the width direction) (T1 <T2 <T3). The main portion 10c may be provided with a protrusion, a recess, or the like for the purpose of reinforcement or attachment to another member, but the thickness T3 of the main portion 10c is the one excluding such a protrusion, the recess, etc. It refers to the thickness in the area of uniform thickness.

  In the present embodiment, the panel main body 10 is provided with a slit 11 extending in the longitudinal direction, and the main body 22 of the decorative member 20 enters the inner periphery of the slit 11. The inner surface of the slit 11 of the panel body 10 is in close contact with the side surfaces on both sides in the width direction of the main body portion 22 of the decorative member 20. In the illustrated example, these surfaces are decorated as they go to the front side in the panel thickness direction. It inclines to the width direction center side (the side which approaches mutually) of line 20a. Of the surface on the front side of the main body 22 of the decorative member 20, the area exposed from the slit 11 is the decorative wire 20a. The decorative line 20a of the example of illustration is comprised by the curved surface which comprised convex on the front side, and the design surface 10a adjoins the width direction both sides without gap. In the present embodiment, as shown in FIG. 2B, the decorative line 20a extends continuously in a substantially straight line along the longitudinal direction (the vehicle width direction). The top (end on the front side) of the decorative wire 20a protrudes on the front side relative to the design surface 10a adjacent to both sides in the width direction in the entire longitudinal direction.

  The surface on the front side of the decorative member 20 and the surface on the back side have the same shape. Specifically, the surface on the front side and the surface on the back side of the main body portion 22 are configured by curved surfaces having the same shape. As a result, a groove 23 extending in the longitudinal direction is provided on the rear surface of the main body 22. The surface on the front side and the surface on the back side of the fixing portion 21 are configured as flat surfaces orthogonal to the panel thickness direction.

  The above-described instrument panel 1 is formed by multicolor molding (two-color molding) in which the panel body 10 is a primary molded body and the decorative member 20 is a secondary molded body. Hereinafter, the manufacturing method of said instrument panel 1 is demonstrated.

  The instrument panel 1 is formed using a mold shown in FIG. The mold comprises a movable die 30 and a stationary die 40. The movable die 30 includes a movable die main body 31 and a slide die 32. The slide mold 32 is slidable with respect to the movable mold main body 31, and in the illustrated example, can slide in the panel thickness direction.

  The fixed mold 40 is provided with a first molding surface 40 a having a concave surface shape extending in the longitudinal direction, and a second molding surface 40 b surrounding the entire circumference of the first molding surface 40 a and molding the design surface 10 a of the panel body 10. Be The second molding surface 40b has a substantially flat portion 40b1 for molding the design surface of the main portion 10c of the panel body 10, and an inclined portion 40b2 for molding the design surface of the thin portion 10d of the panel body 10. The movable mold main body 31 has a molding surface 31 a surrounding the entire circumference of the slide mold 32 and molding the back surface 10 b of the panel main body 10. The slide mold 32 has a first molding surface 32a having a convex curved surface extending in the longitudinal direction, and a second molding surface 32b provided on both sides in the width direction of the first molding surface 32a and molding the inner surface of the slit 11 of the panel body 10. And a third molding surface 32 c provided on the outer side in the width direction of the second molding surface 32 b and molding the back surface 10 b of the panel main body 10. In the illustrated example, the pair of second molding surfaces 32b of the slide die 32 is inclined inward in the width direction as it goes to the front side in the panel thickness direction (upward in the drawing), and is smoothly continuous with the first molding surface 32a.

  First, as shown in FIG. 3A, the movable mold 30 and the fixed mold 40 are clamped. Specifically, the movable mold main body 31 is brought into contact with the fixed mold 40, and the first molding surface 32 a of the slide mold 32 is fitted to the first molding surface 40 a of the fixed mold 40. Thereby, the first cavity 51 is formed by the second molding surface 40b of the fixed mold 40, the molding surface 31a of the movable mold main body 31, and the second molding surface 32b and the third molding surface 32c of the slide mold 32. . The first cavity 51 has a main region 51 a for molding the main portion 10 c of the panel body 10 and a thin region 51 b for molding the thin portion 10 d of the panel body 10. The main region 51 a of the first cavity 51 is provided between the substantially flat portion 40 b 1 of the second molding surface 40 b of the fixed mold 40 and the molding surface 31 b of the movable mold main body 31. The thin region 51 b of the first cavity 51 is provided between the inclined portion 40 b 2 of the second molding surface 40 b of the fixed mold 40 and the molding surface 31 b of the movable mold main body 31 and the third molding surface 32 c of the slide mold 32. By injecting a resin into the first cavity 51 and solidifying the resin, the panel body 10 is formed. At this time, the resin in the thin-walled region 51b of the first cavity 51 (thin-walled portion 10d of the panel main body 10) solidifies earlier than the resin in the main region 51a (main-portion 10c of the panel main body 10).

  Thereafter, in a state where the movable mold main body 31 and the fixed mold 40 are in contact with each other, the slide mold 32 is retracted to the side (downward in the figure) separating from the fixed mold 40 as shown in FIG. Thereby, the second cavity 52 is formed by the first molding surface 40a of the fixed mold 40, the inner and back surfaces 10b of the slits 11 of the panel body 10, and the first to third molding surfaces 32a to 32c of the slide mold 32. Ru. The decorative member 20 is formed by injecting a resin different from the resin of the panel main body 10 into the second cavity 52.

  At this time, the injection pressure of the molten resin injected into the second cavity 52 is applied to the panel body 10 formed earlier, but the thin portion 10 d provided on the panel body 10 is solidified early so that the thin portion 10 d is formed. Deformation is suppressed, so that molten resin can be prevented from entering between the panel body 10 and the mold.

  Specifically, in the embodiment, in the state shown in FIG. 3A, the panel thickness direction dimension T1 ′ at the boundary B1 ′ between the slide mold 32 and the fixed mold 40 in the first cavity 51 is the first Since it is smaller than the panel thickness direction dimension T3 ′ in the main region 51a of the cavity 51, the resin in the vicinity of the widthwise inner end (boundary B1 ′) of the first cavity 51 cures earlier than the resin in the main region 51a. . Thereby, the width direction inner end (the slit 11 side end) of the thin-walled portion 10d of the panel main body 10 molded by the first cavity 51 is completely solidified, and is deformed by the pressure of the resin injected into the second cavity 52 This makes it difficult to prevent the resin from entering between the design surface of the thin portion 10 d of the panel body 10 and the inclined portion 40 b 2 of the second molding surface 40 b of the fixed mold 40. As a result, the resin of the decorative member 20 leaks to the design surface 10a of the panel main body 10, and it is possible to prevent a situation where these boundaries (dividing lines) become unclear.

  Further, in the present embodiment, in the state shown in FIG. 3A, the panel thickness direction dimension T2 ′ at the boundary B2 ′ of the slide mold 32 and the movable mold main body 31 in the first cavity 51 is the boundary B2 ′. Since it is smaller than the panel thickness direction dimension T3 'in the region (main region 51a of the first cavity 51) which is further away from the slide die 32, the resin in the vicinity of the boundary B2' of the first cavity is cured early. As a result, the widthwise intermediate portion (near the boundary B2 on the back surface side between the panel main body 10 and the decorative member 20) of the thin-walled portion 10d of the panel main body 10 molded by the first cavity 51 is completely solidified. Since the resin is not easily deformed by the pressure of the resin injected into 52, it is possible to prevent the resin from entering between the back surface of the thin portion 10d of the panel main body 10 and the molding surface 31a of the movable mold main body 31. As a result, the situation where the panel body 10 is pressed to the fixed mold 40 side by the pressure of the molten resin (see P part in FIG. 7) which entered between the panel body 10 and the movable mold body 31 is avoided. The deformation of the design surface 10a can be prevented.

  The present invention is not limited to the above embodiment. Hereinafter, although other embodiments of the present invention are described, explanation is omitted about the same point as the above-mentioned embodiment.

  Although the above-mentioned embodiment showed the case where thickness of thin part 10d of panel body 10 became thin gradually toward the decoration line 20a side, it is not restricted to this. For example, as shown in FIG. 4, the thickness of the thin portion 10 d of the panel main body 10 may be made uniform. In this case, the thickness T1 of the panel body 10 at the boundary B1 of the surface side (the design surface side) of the panel body 10 and the decoration member 20, and the back surface side of the panel body 10 and the decoration member 20 (opposite to the design surface The wall thickness T2 of the panel body 10 at the boundary B2 of the side) is equal to that of the panel body 10, and these are thinner than the wall thickness T3 of the main portion 10c.

  The embodiment shown in FIG. 5 is different from the above embodiment in that the decorative member 20 has a substantially flat shape. Of the decorative member 20, a portion fixed to the back surface 10b of the panel main body 10 is the fixing portion 21, and a region covering the slit 11 of the panel main body 10 from the back side is the main body portion 22. In the example of illustration, the fixing | fixed part 21 is provided in the width direction both sides of the main-body part 22, and the surface of the front side of the main-body part 22 is exposed from the slit 11, and comprises the decoration wire 20a. As described above, by forming the decorative member 20 into a substantially flat plate shape, the second cavity for molding the decorative member 20 also becomes a substantially flat plate shape, so that the resin can be easily filled in the second cavity. Formability, and hence the dimensional accuracy of the decorative wire 20a.

  Moreover, in said embodiment, although the perimeter of the decoration wire 20a is enclosed by the design surface 10a, you may provide the decoration wire 20a in the edge part of the panel main body 10, for example, of the panel main bodies 10 The decorative line 20a may be provided along the edge of the through hole for attaching an audio or the like. Moreover, the design surface of the secondary molded body can be made into arbitrary shapes, such as not only the decoration line 20a but a rectangle etc. FIG.

  Further, the present invention is not limited to the instrument panel, and any resin panel component in which a primary molded body having a design surface and a secondary molded body are integrally formed by multicolor molding, regardless of the application or the shape, is applied. It is possible.

1 Instrument panel 10 Panel body (primary molding)
10a Design surface 10b Back surface 10c Main portion 10d Thin portion 20 Decorative member (secondary molded body)
20a Decorative line (design side)
Reference Signs List 21 fixed part 22 main body part 30 movable mold 31 movable mold main body 32 slide mold 40 fixed mold 51 first cavity 51 a main area 51 b thin area 52 second cavity

Claims (2)

A primary molding having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molding, and a secondary molding having a fixing portion fixed to the rear surface of the primary molding A resin panel component comprising the primary molded body and the secondary molded body integrally formed by multicolor molding,
A panel part whose thickness at the boundary between the back surface of the primary molded body and the back surface of the secondary molded body in the primary molded body is thinner than that in a region separated from the secondary molded body than the boundary . A primary molding having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molding, and a secondary molding having a fixing portion fixed to the rear surface of the primary molding It is a manufacturing method of the resin panel parts provided,
A first cavity is formed by clamping one mold having a mold body and a slide mold, and the other mold that can be moved toward and away from the one mold, to form a first cavity, and resin in the first cavity Forming the primary molded body by injecting
A second cavity is formed by sliding the slide mold with respect to the mold body to separate from the other mold, and injecting a resin different from the resin of the panel body into the second cavity. Forming the secondary molded body according to
The dimension in the panel thickness direction at the boundary between the molding surface of the slide mold and the molding surface of the die body in the first cavity is greater than the dimension in the panel thickness direction in the region separated from the slide mold than the boundary. Also a method of manufacturing small resin panel parts.

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