JP2020006527A - Automotive member and method of manufacturing the same - Google Patents

Abstract

To provide an automobile member having excellent design properties and capable of securing a sufficient fixing area and fixing strength.SOLUTION: An automotive member 10 in which is composed of a foamed resin molded body 11, a concave groove 14 indented inward from the surface on the vehicle body side is formed so as to substantially follow the outer peripheral edge 12 at a position near the terminal of a terminal peripheral region 13 of at least a part of the outer peripheral edge 12, a surface 15 n of the vehicle body side outside from the concave groove 14 of the terminal peripheral region 13 and a surface 15 m of the vehicle body side on the inside from the concave groove 14 of the terminal peripheral region 13 are formed substantially flush, and the terminal 16 in the terminal peripheral region 13 is formed in a substantially arc shape from the outer surface 17 to the outer peripheral edge 12 at the end of the surface 15n of the vehicle body side.SELECTED DRAWING: Figure 3

Description

  TECHNICAL FIELD The present invention relates to an automobile member formed of a foamed resin molded article and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a member formed of a foamed resin molded body has been known as an automobile member. As such automobile members, for example, Patent Literatures 1 and 2 disclose side fenders and fronts formed of a foamed resin molded body in which a foamed portion having a plurality of voids is covered with a non-foamed skin layer. A pillar armor plate is disclosed.

JP 2010-221865 A JP 2010-221866 A

  By the way, it is preferable that an automobile member formed of a foamed resin molded article be molded by core-back injection foam molding because it can obtain high rigidity and can be reduced in weight. However, as shown in FIGS. 13 and 14, for example, the cavity 103 provided between the fixed mold 101 and the movable mold 102 is filled with the foamable molten resin 104 by the core back injection foam molding process, and the movable mold 102 is When the foamed molten resin 104 is moved and foamed to form the foamed resin molded body 105, a lug 106 protruding outward in a substantially mountain shape is formed at the end of the foamed resin molded body 105.

  When such a substantially mountain-shaped ear portion 106 is formed, the design of the automobile member deteriorates, and when the automobile member is fixed to the body, the terminal ear 106 cannot be fixed. However, the terminal is in a floating state, and it is difficult to obtain a sufficient fixing strength. Therefore, there is a need for a member for an automobile that is formed of a foamed resin molded article that has excellent design properties and can secure a sufficient fixing area and fixing strength.

  The present invention has been made in view of the above-described problems, and proposes an automotive member formed of a foamed resin molded article, which has excellent design properties, can secure a sufficient fixing area and a sufficient fixing strength, and its manufacture. The aim is to provide a method.

The automotive member of the present invention is formed of a foamed resin molded article, and a groove recessed inward from a surface on the vehicle body side at least at a position near a terminal in a terminal peripheral area of at least a part of the outer peripheral edge substantially follows the outer peripheral edge. And a surface on the vehicle body side outside the concave groove in the terminal peripheral region and a surface on the vehicle body side inside the concave groove in the terminal peripheral region are formed substantially flush with each other, and around the terminal. The terminal of the area is formed in a substantially arc shape from the outer surface to the outer peripheral edge of the tip of the surface on the vehicle body side.
According to this, the terminal at the required portion of the outer peripheral edge of the automobile member or the entire terminal of the outer peripheral edge is inverted with respect to the outer surface or the vehicle body without forming an outwardly protruding ear portion in a substantially mountain shape on the terminal. It can be formed in a substantially arc shape extending from the side surface to the outer peripheral edge of the front end of the vehicle body side surface, and the design of the automobile member can be enhanced. Further, by forming the surface on the vehicle body side outside the groove in the terminal peripheral region and the surface on the vehicle body side inside the groove substantially flush with each other, a wide vehicle body side surface extending inside and outside the groove is fixed. It can be used as Therefore, a sufficient fixing region of the automobile member can be obtained, and it is possible to secure a sufficient fixing strength of the automobile member. Also, a wide surface on the vehicle body extending in and out of the concave groove can be used as a surface for attaching a cushioning material or the like, and the cushioning material or the like can be attached with a sufficient fixing area and a sufficient fixing strength. In addition, since a substantially arc-shaped surface on the vehicle body side near the terminal can be used as the fixing region, it is possible to prevent the terminal from floating. In addition, due to the shape in which the concave groove is formed in the vicinity of the terminal, the manufacturing and processing of an automobile member having a substantially arc-shaped terminal, and a surface on the vehicle body side in a peripheral region of the terminal having a wide, substantially flat surface as a whole. Can be facilitated.

The automotive member of the present invention is characterized in that the foamed resin molded body is a core-back injection foamed molded body in which the periphery of a foamed portion is covered with a skin portion.
According to this, the rigidity of the vehicle member can be increased, and the weight can be significantly reduced. Further, the structure in which the periphery of the foamed portion is covered with the skin portion can further enhance the design of the automobile member. Further, by using the core-back injection foamed molded article, the control of the foamed structure is facilitated, and it is possible to easily obtain an automobile member of a foamed resin molded article more suitable for the type of the member.

The automotive member according to the present invention is characterized in that a portion closer to the end than the concave groove is formed so that the periphery of the foamed portion is covered with the skin portion.
According to this, since the portion closer to the terminal than the groove has a foamed portion, the size of the portion closer to the terminal than the groove can be increased, and the area of the vehicle body side surface outside the groove can be increased. It is possible to further reliably use the wide surface on the vehicle body extending in and out of the concave groove as a fixing surface.

The method for manufacturing an automobile member according to the present invention is a method for manufacturing an automobile member according to the present invention, wherein a foam having a substantially L-shaped cross section provided between a fixed mold and a movable mold has a foamable melt. A first step of filling a resin; and a second step of moving the movable mold away from the fixed mold to foam the foamable molten resin to form the automotive member. .
According to this, a member having a predetermined shape can be easily obtained by filling a cavity having a substantially L-shaped cavity with a foamable molten resin and performing core-back injection foam molding.

The method for manufacturing a member for an automobile according to the present invention includes a first movable mold and a second movable mold as the movable mold, and a substantially L-shaped outer surface of the cavity having a substantially L-shape in sectional view is partitioned by the fixed mold. The first movable mold defines a substantially L-shaped inner side surface of the substantially L-shaped cross-section cavity, and the second movable mold defines a distal end surface of the substantially L-shaped cavity in cross-sectional view. In the method, the foamable molten resin is filled in the substantially L-shaped cross-sectional cavity surrounded by the fixed mold, the first movable mold, and the second movable mold, and in the second step, at least the second movable mold is filled. In this state, the first movable die is moved away from the fixed die to foam the foamable molten resin, thereby forming the automobile member.
According to this, by moving the first movable mold while pressing the front end of the foamable molten resin with the second movable mold and foaming, the surface on the vehicle body side outside the concave groove in the peripheral region of the terminal and the inside of the concave groove are formed. The automobile member whose surface on the vehicle body side is substantially flush can be formed with high accuracy and reliability. Further, it is possible to easily and reliably obtain a structure in which a portion closer to the end than the concave groove has a foamed portion, and to surely increase the area of a region which can be used as a fixing surface of the vehicle body side surface outside the concave groove. Can be.

  ADVANTAGE OF THE INVENTION According to this invention, in the member for motor vehicles comprised by a foamed resin molded object, while designability can be improved, sufficient fixation area | region and fixation strength can be ensured.

The front view which looked at the member for vehicles of the embodiment by the present invention from the outside. The rear view which looked at the member for vehicles of an embodiment from the inside. FIG. 2 is an end view of a state in which the vehicle member according to the embodiment is fixed to a vehicle body. Sectional explanatory drawing which shows a part of the state which formed the cavity by the fixed type | mold and 1st movable type | mold, and the 2nd movable type | mold which manufacture the member for vehicles of embodiment. Sectional explanatory drawing which shows a part of the state where the foamable molten resin was filled into the cavity of FIG. FIG. 6 is an explanatory sectional view showing a part of a state in which the first movable mold is moved away from the fixed mold from the state of FIG. 5; FIG. 7 is an explanatory sectional view showing a part of a state in which the first movable mold and the second movable mold are moved away from the fixed mold from the state of FIG. 6. FIG. 9 is an end view of a state in which a vehicle member according to a modified example of the present invention is fixed to a vehicle body. Sectional explanatory drawing which shows a part of the state where the cavity was partitioned and formed with the fixed type | mold and the movable type | mold which manufacture the member for vehicles of a modification. Sectional explanatory drawing which shows a part of the state which filled the foamable molten resin in the cavity of FIG. Sectional explanatory drawing which shows a part of the state which moved the movable type | mold from the state of FIG. 10 away from the fixed type | mold. FIG. 12 is a cross-sectional explanatory view showing a part of a state in which the movable mold has been moved further away from the fixed mold from the state of FIG. 11. Sectional explanatory drawing which shows a part of the state where the cavity was defined by the fixed mold and the movable mold which manufacture the member for vehicles of the prior art example, and the foam was filled with the foamable molten resin. FIG. 14 is an explanatory sectional view showing a part of a state where the movable mold is moved away from the fixed mold from the state of FIG. 13;

[Automotive member and method of manufacturing the embodiment]
As shown in FIGS. 1 to 3, the automobile member 10 according to the embodiment of the present invention is an example of an automobile side sill, which is an automobile exterior member, and is formed of a foamed resin molded body 11. The foamed resin molded body 11 of the present embodiment is a core-back injection foamed molded body in which the periphery of the foamed part 111 is covered with a skin part 112.

  In a part of the outer peripheral edge 12 of the vehicle member 10, a concave groove 14 is formed at a position near the terminal in the terminal peripheral region 13 so as to substantially indent from the surface on the vehicle body 20 side so as to substantially follow the outer peripheral edge 12. In addition to the configuration in which the concave groove 14 is formed so as to substantially follow a required part of the outer peripheral edge 12 of the vehicle member 10, the concave groove 14 is formed so as to approximately follow the entire outer periphery 12 of the automotive member 10. It is also possible to adopt a configuration in which:

  A surface 15n on the vehicle body 20 side outside the concave groove 14 in the terminal peripheral region 13 and a surface 15m on the vehicle body 20 side inside the concave groove 14 in the terminal peripheral region 13 are formed substantially flush. The terminal 16 in the terminal peripheral region 13 is formed in a substantially arc shape from the outer surface 17 of the vehicle member 10 to the outer peripheral edge 12 at the tip of the surface 15n on the vehicle body 20 side.

  In the automotive member 10 of the present embodiment, a portion closer to the inner side than the concave groove 14 is formed so that the periphery of the foamed portion 111 is covered with the skin portion 112 and substantially corresponds to the substantially arc-shaped terminal 16. A portion closer to the end than the groove 14 to be formed is also formed so that the periphery of the foamed portion 111 is covered with the skin portion 112, and both the surface 15 m and the surface 15 n on the outer surface side of the exterior member are formed of the foamed portion 111. It is formed so that the periphery is covered with the skin portion 112.

  The vehicle member 10 of the present embodiment can use both the surface 15n outside the groove 14 and the surface 15m inside the concave groove 14 of the terminal peripheral region 13 as a surface to be fixed to the vehicle body 20 or a surface to which a cushioning material is attached. For example, as shown in FIG. 3, it is possible to attach the double-sided tape 21 to both the surface 15m and the surface 15n, and attach and fix the automobile member 10 to the vehicle body 20 via the double-sided tape 21. .

  When manufacturing the automobile member 10 of the present embodiment, preferably, the core back injection using the fixed mold 31 and the first movable mold 32 and the second movable mold 33 arranged so as to face the fixed mold 31. It is manufactured by performing foam molding. First, a cavity is formed between the fixed mold 31 and the first movable mold 32 and the second movable mold 33 such that a cavity 34 having a substantially L-shaped cross section is provided. The substantially L-shaped outer surface 341 of the substantially L-shaped cavity 34 in sectional view is defined by the fixed mold 31, and the substantially L-shaped inner surface 342 of the substantially L-shaped cavity 34 in sectional view is defined by the first movable mold 32. The distal end surface 343 of the cavity 34 having a substantially L-shape in cross section is defined by a second movable mold 33 disposed adjacent to the first movable mold 32 (see FIG. 4).

  Then, a foamable molten resin MR is injected and filled into a cavity having a substantially L-shaped cavity 34 in cross section provided between the fixed mold 31 and the first movable mold 32 and the second movable mold 33, and the fixed mold 31 is filled. The foamable molten resin MR is also filled in the cavity 34 having a substantially L-shaped cross section surrounded by the first movable mold 32 and the second movable mold 33, and is filled with the foamable molten resin MR in a substantially L-shaped cross section. (See FIG. 5). In addition, as a material of the foamable molten resin MR, an appropriate material such as a polypropylene-based material and a polyethylene-based material can be used.

  Thereafter, as shown in FIG. 6, the adjacent first movable mold 32 is moved away from the fixed mold 31 with the second movable mold 33 fixed, and the foamable molten resin MR is foamed by releasing the pressure. Then, the automobile member 10 is formed. At this time, the second movable die 33 foams the foamable molten resin MR while holding the foamable molten resin MR at the position of the front end face 343 with the resin contact surface 331 in the stationary state. Also, the first movable mold 32 is retracted and moved to a position where at least the resin contact surface 321 around the adjacent position to the second movable mold 33 is substantially flush with the resin contact surface 331 of the second movable mold 33. At this position, the first movable mold 32 is stopped, and the foamable molten resin MR is foamed to form the automobile member 10 in which the concave groove 14 is formed and the foamed portion 111 is covered with the skin portion 112.

  After the foaming of the foamable molten resin MR is completed and the automobile member 10 is formed, both the first movable mold 32 and the second movable mold 33 are separated from the fixed mold 31 as shown in FIG. Then, the mold is opened, and the molded automobile member 10 is taken out to obtain the automobile member 10.

  According to the present embodiment, the terminal 16 at a required portion of the outer peripheral edge 12 of the automobile member 10 or the entire terminal of the outer peripheral edge 12 is formed without forming an outwardly protruding ear portion in a substantially mountain shape on the terminal. A substantially arcuate shape extending from the outer surface 17 or the side opposite to the vehicle body to the outer peripheral edge 12 at the tip of the surface 15n on the vehicle body side can be obtained, and the design of the vehicle member 10 can be enhanced. Further, by forming the surface 15n on the vehicle body side outside the groove 14 in the terminal peripheral region 13 and the surface 15m on the vehicle body side inside the groove 14 substantially flush with each other, a wide vehicle body extending inside and outside the groove 14 is formed. Side surfaces 15m and 15n can be used as the fixing surfaces. Therefore, a sufficient fixing region of the vehicle member 10 can be obtained, and sufficient fixing strength of the vehicle member 10 can be secured. Further, the wide surfaces 15m and 15n on the vehicle body extending in and out of the concave groove 14 can also be used as a bonding surface of a cushioning material or the like, and the cushioning material or the like can be bonded with a sufficient bonding area and bonding strength. . Further, the substantially arc-shaped surface 15n on the vehicle body side near the terminal can also be used as the fixing region, so that the terminal 16 can be prevented from floating. In addition, a shape in which the concave groove 14 is formed in the vicinity of the terminal has a substantially arc-shaped terminal 16, and the surface 15 m and 15 n on the vehicle body side of the terminal peripheral region 13 have a wide, substantially flat shape as a whole. Manufacture and processing of the member 10 can be facilitated.

  In addition, by forming the foamed resin molded body 11 as a core-back injection foamed molded body in which the periphery of the foamed portion 111 is covered with the skin portion 112, the rigidity of the automobile member 10 can be increased, and the weight can be significantly reduced. Can be planned. Further, the structure in which the periphery of the foamed portion 111 is covered with the skin portion 112 can further enhance the design of the automobile member 10. Further, by using a core-back injection foamed molded article, the control of the foamed structure becomes easy, and the automobile member 10 of the foamed resin molded article 11 more suitable for the type of the member can be easily obtained.

  In addition, the configuration in which the portion closer to the terminal than the concave groove 14 has the foaming portion 111 increases the size of the portion closer to the terminal than the concave groove 14 and increases the area of the vehicle body side surface 15n outside the concave groove 14. As a result, it is possible to more reliably use the wide surfaces 15m and 15n on the vehicle body side extending inside and outside the concave groove 14 as a fixing surface.

  Further, the cavity having the substantially L-shaped cavity 34 in cross section is filled with the foamable molten resin MR, and the automobile member 10 is manufactured by core-back injection foam molding, so that the automobile member 10 having a predetermined shape can be easily obtained. be able to. Further, the first movable mold 32 is moved by the second movable mold 33 while pressing the front end of the foamable molten resin MR to foam the resin, so that the surface 15n on the vehicle body side outside the groove 14 in the terminal peripheral region 13 is recessed. The automobile member 10 in which the surface 15m on the vehicle body side inside the groove is substantially flush can be formed with high accuracy. Furthermore, a structure having a foamed portion 111 at a portion closer to the end than the concave groove 14 can be obtained easily and reliably, and the area of a region that can be used as a fixing surface of the vehicle body side surface 15n outside the concave groove 14 is ensured. Can be increased.

(Inclusion range of the present disclosure)
The invention disclosed in the present specification is not limited to each of the inventions, the embodiments, and the modifications thereof listed as the invention, but may be modified by changing these partial contents to other contents disclosed in the present specification within an applicable range. Specified items, or those specified by adding other contents disclosed in this specification to these contents, or these partial contents are deleted as far as a partial operation and effect can be obtained to form a higher concept. Includes those specified. The invention disclosed in this specification also includes the following modified examples and additional contents.

  For example, the automobile member 10 of the above embodiment is formed such that a portion closer to the end than the concave groove 14 is covered with the skin portion 112 around the foamed portion 111. 8 has a structure in which a portion closer to the end than the concave groove 14 is not foamed as a whole to form the skin portion 112, like the automobile member 10a of the modified example in FIG. 8, that is, the inside of the substantially arc-shaped terminal 16a. The one in which the substantially corresponding part is the skin part 112 is also included.

  In the vehicle member 10a of the modified example of FIG. 8, the portion closer to the terminal than the concave groove 14 is not foamed as a whole, and the size of the skin portion 112 is smaller than that in the above-described embodiment. The area of the surface 15n on the vehicle body 20 side outside the concave groove 14 is smaller than the area in the above embodiment. Other basic configurations of the vehicle member 10a of the modified example are the same as those of the vehicle member 10 of the embodiment.

  When the automobile member 10a of the modified example is manufactured, core member injection foaming molding using, for example, a fixed mold 35 and a movable mold 36 arranged to face the fixed mold 35 is performed, and the fixed mold 35 is manufactured. The cavity is formed such that a cavity 37 having a substantially L-shaped cross section is provided between the movable die 36 and the movable die 36. The substantially L-shaped outer surface 371 of the substantially L-shaped cavity 37 in section is defined by a fixed mold 35, and the substantially L-shaped inner surface 372 and the tip surface 373 of the substantially L-shaped cavity 37 are defined by a movable mold 36. (See FIG. 9). The distal end near the distal end surface 373 of the cavity 37 having a substantially L-shape in cross section forms the skin portion 112 of a portion substantially corresponding to the inside of the substantially arc-shaped terminal 16a. The thickness is smaller than the location.

  Then, the foamable molten resin MR is injected and filled into a cavity having a substantially L-shaped cavity 37 in cross section provided between the fixed mold 35 and the movable mold 36, and a section surrounded by the fixed mold 35 and the movable mold 36. The substantially molten L-shaped cavity 37 is also filled with the foamable molten resin MR so that the substantially molten L-shaped cross-section is filled with the foamable molten resin MR (see FIG. 10). It should be noted that a suitable material such as a polypropylene-based material and a polyethylene-based material can also be used as the material of the foamable molten resin MR of the modified example.

  Thereafter, as shown in FIG. 11, the movable mold 36 is moved so as to be separated from the fixed mold 35, the foamable molten resin MR is foamed by releasing the pressure, the concave groove 14 is formed, and the foamed portion 111 becomes the skin portion 112. To form an automobile member 10a covered with. At this time, a skin portion 112 is formed in a portion substantially corresponding to the inside of the substantially arc-shaped terminal 16a.

  After the foaming of the foamable molten resin MR is completed and the automobile member 10a is formed, as shown in FIG. 12, the movable mold 36 is moved further away from the fixed mold 35, and the mold is opened. The molded automobile member 10a is taken out to obtain the automobile member 10a. Note that the same modified configuration as the vehicle member 10 can be used for the vehicle member 10a.

  In the vehicle member 10a of the modified example, the size of the portion closer to the end than the concave groove 14 is smaller than that of the vehicle member 10 of the above embodiment, and the area of the vehicle body side surface 15n outside the concave groove 14 is reduced. Although the area that can be used as the surface to be fixed to the vehicle body 20 or the surface to which the cushioning material is attached is reduced, a corresponding effect can be obtained from the structure corresponding to the vehicle member 10 and the manufacturing method thereof according to the other embodiments.

  Further, the vehicle member 10 of the above embodiment and the vehicle member 10a of the modified example can be used for an appropriate vehicle exterior member made of a foamed resin molded body other than the side sill, such as a fender and a front grill. , Tailgate doors and the like. Further, the automotive member of the present invention is preferably used as an exterior member for an automobile, but can also be used as an interior member for an automobile. The automotive member of the present invention includes an exterior member and an interior member. Suitable automotive components are included.

  INDUSTRIAL APPLICABILITY The present invention can be used for various types of automobile members formed of a foamed resin molded body such as a side sill, a fender, a front grill, and a tailgate door.

10, 10a: Automotive member 11: Foamed resin molded article 111: Foamed portion 112: Skin portion 12: Peripheral edge 13: Terminal peripheral area 14: Concave groove 15m, 15n: Surface of terminal peripheral area 16, 16a: Terminal 17 ... Outer surface 20 ... Car body 21 ... Double-sided tape 31 ... Fixed mold 32 ... First movable mold 321 ... Resin contact surface 33 ... Second movable mold 331 ... Resin contact surface 34 ... Cavity of approximately L-shape in cross section 341 ... Outside of approximately L-shape Side surface 342: substantially L-shaped inner surface 343 ... distal end surface 35 ... fixed type 36 ... movable type 37 ... substantially L-shaped cavity 371 ... substantially L-shaped outer surface 372 ... substantially L-shaped inner surface 373 ... distal surface MR ... foaming Molten resin 101 ... Fixed mold 102 ... Movable mold 103 ... Cavity 104 ... Foamable molten resin 105 ... Foamed resin molded body 106 ... Ear part

Claims (5)

It is composed of a foamed resin molding,
A groove recessed inwardly from the surface on the vehicle body side is formed at a position near the terminal in a terminal peripheral region of at least a part of the outer peripheral edge so as to substantially follow the outer peripheral edge,
A surface on the vehicle body side outside the concave groove in the terminal peripheral region and a surface on the vehicle body side inside the concave groove in the terminal peripheral region are formed substantially flush,
A member for an automobile, wherein the terminal in the terminal peripheral region is formed in a substantially arc shape from an outer surface to an outer peripheral edge of a front end of the surface on the vehicle body side.   The automobile member according to claim 1, wherein the foamed resin molded body is a core-back injection foamed molded body in which a periphery of a foamed portion is covered with a skin portion.   The automobile member according to claim 2, wherein a portion closer to the end than the concave groove is formed so that the periphery of the foamed portion is covered with the skin portion. It is a manufacturing method of the member for vehicles of Claim 2 or Claim 3, Comprising:
A first step of filling a foamable molten resin into a cavity having a substantially L-shaped cross section provided between a fixed mold and a movable mold,
A second step of moving the movable mold away from the fixed mold to foam the foamable molten resin to form the automobile member, the method comprising: The movable type includes a first movable type and a second movable type,
A substantially L-shaped outer side surface of the substantially L-shaped cavity is defined by the fixed type, and a substantially L-shaped inner side surface of the substantially L-shaped cavity is defined by the first movable type. The tip surface of the substantially L-shaped cavity is partitioned by the second movable mold,
In the first step, the foamable molten resin is filled in the substantially L-shaped cross-sectional cavity surrounded by the fixed mold, the first movable mold, and the second movable mold,
In the second step, at least the second movable mold is fixed and the first movable mold is moved away from the fixed mold to foam the foamable molten resin, thereby forming the automobile member. The method for manufacturing a member for an automobile according to claim 4, characterized in that:

Images