JP2000085495A - Bumper for vehicle and forming die for bumper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the rigidity of a bumper by strengthening the intersection where a horizontal rib and a vertical rib cross each other. SOLUTION: A vertical face section 3a of a bumper face is reinforced by a horizontal rib 5 and a vertical rib 7 which intersect each other on the back face side of a bumper. A gap 9 is formed between the vertical rib 7 and the back face of the vertical face section 3a of the bumper face. The intersection of the horizontal rib 5 and the vertical rib 7 is strengthened for shock by connecting both sides of the vertical rib 7 and the horizontal rib 5 at a curved face 11a in the section where the horizontal rib 5 and the vertical rib 7 intersect each other and making a connection section 11 thick.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle bumper and a molding die thereof, and more particularly to a measure for reinforcing a rib.

[0002]

2. Description of the Related Art In a resin bumper for a vehicle, a reinforcing rib is integrally formed on a back surface of a vertical surface portion of a bumper face to secure rigidity so as not to be damaged in a collision. For example, in Japanese Utility Model Laid-Open Publication No. 61-113161 (hereinafter referred to as "conventional example 1"), a vertical rib is integrally formed on the back surface of a vertical surface portion of a bumper face. Also,
10259 (hereinafter referred to as "Conventional Example 2") and JP-A-9-201841 (hereinafter referred to as "Conventional Example 3")
In this example, the horizontal ribs and the vertical ribs are integrally formed on the back surface of the bumper face vertical surface portion so as to cross each other.

By the way, when the reinforcing rib is integrally formed on the vertical surface of the bumper face as described above, the thickness of the connecting portion between the reinforcing rib and the vertical surface of the bumper face becomes thicker than other portions. A difference in heat shrinkage is generated between the first and second portions, and a depression called sink marks is formed on the surface of the vertical surface of the bumper face corresponding to the thick portion, and the appearance is deteriorated.

Therefore, in the above-mentioned conventional example 1, the thickness of the upper end of the vertical rib is made thinner than other portions so that the surface of the upper surface of the bumper face does not have sink marks.

[0005] In Conventional Example 2, the thickness of the base end of the vertical rib is made thinner than the other portions so that the surface of the bumper face vertical surface does not have sink marks.

In Conventional Example 3, the thickness of the base end of the vertical rib is made smaller than that of the other portions, and a hollow portion is formed at the base end of the horizontal rib by gas injection so that the thickness of the base end becomes smaller. The thickness of the bumper face is not thicker than that of the portion, so that the surface of the vertical surface of the bumper face does not have sink marks.
In the third conventional example, the reason why the thickness of the base end of the vertical rib is made thinner than that of the other parts is as a measure against sink marks by providing a gap between the vertical rib and the rear surface of the bumper face vertical surface so as not to come into contact with each other. It is described in the column of [Problems to be Solved by the Invention] that the reinforcement effect of the horizontal ribs is reduced when the molding is performed, and that the reason is that the balance between sink and reinforcement is considered. When considering only sink measures, it is needless to say that it is better that the vertical ribs are not in contact with the bumper face at a distance than in contact with the back surface of the vertical surface of the bumper face.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a conventional example 3 of the prior arts 1 to 3, which is disclosed as a problem to be solved in the prior art 3 "to prevent the vertical ribs from contacting the back surface of the bumper face vertical surface. A structure that forms a gap between them. ''
In other words, it is an object of the present invention to improve the reinforcing effect of the ribs and the bumper in a state in which there is no room for sinks to occur. In particular, in the bumper having such a structure, the vertical rib crosses the cross rib extending from the middle of the horizontal rib toward the tip end of the horizontal rib extending in the longitudinal direction of the bumper face. A crack is easily formed at the intersection between the horizontal rib and the vertical rib due to the impact, and some reinforcement measures are desired so that the bumper is not damaged.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the strength of an intersection between a horizontal rib and a vertical rib to secure the rigidity of a bumper. .

[0009]

In order to achieve the above object, the present invention is characterized in that the intersection between the horizontal rib and the vertical rib is strengthened against impact.

Specifically, the present invention relates to a curved bumper face vertical surface portion extending in the vehicle width direction and having a central portion protruding toward the vehicle body side, and a rear side of the bumper face vertical surface portion from upper and lower ends of the bumper face vertical surface portion. A bumper face having a U-shaped cross-section in which a bumper face upper surface portion and a bumper face lower surface portion are integrally formed, and a bumper face integrally formed so as to project horizontally on the back surface of the bumper face vertical surface portion and extend in the longitudinal direction. Between the horizontal rib and a rear surface of the vertical surface of the bumper face that extends perpendicularly to the horizontal rib and perpendicular to the longitudinal direction of the bumper face at the end of the bumper face in the longitudinal direction from the center of the bumper face in the longitudinal direction. For vehicles made of resin consisting of horizontal ribs and vertical ribs integrally molded with a gap And bumpers and assumes its mold,
The following solution was taken.

That is, the first aspect of the present invention relates to the former vehicle bumper. In consideration of the above-mentioned premise, both sides of the vertical rib and the horizontal rib are formed at the intersection of the horizontal rib and the vertical rib. Are connected by a curved surface or an inclined surface, and the connecting portion is formed thick.

According to the above construction, the intersection of the horizontal rib and the vertical rib is reinforced by the thick connecting portion, and the connecting portion is connected even if an impact at the time of collision acts on the connecting portion. There is no crack in the part and the bumper does not break. In addition, the rigidity of the entire horizontal rib is ensured by reinforcing the intersection, and the reinforcing effect of the horizontal rib does not decrease even if there is a gap between the vertical rib and the rear surface of the bumper face vertical surface.

A second aspect of the present invention relates to the latter mold for a vehicle bumper. In view of the above-mentioned premise, a first mold for molding the surface of the vertical surface of the bumper face, A second mold for contacting / separating a mold in a direction perpendicular to the longitudinal direction of the bumper face and molding the back surface of the vertical surface of the bumper face, the upper and lower surfaces of the horizontal ribs, and one side surface of the longitudinal rib opposite the central portion in the longitudinal direction of the bumper face. The molding die, slides toward the center of the bumper face in the longitudinal direction at the time of removal from the mold, and then slides in the direction perpendicular to the longitudinal direction of the bumper face, and slides in the direction perpendicular to the longitudinal direction of the bumper face. And a slide mold for molding the other side surface at the center in the direction. Further, a projecting portion for forming a gap between the vertical rib and the back surface of the bumper face vertical surface portion is formed in the second rib.
The protrusion extends from the surface of the vertical rib formed by the forming die toward the center of the bumper face in the longitudinal direction and protrudes from the slide die.
Further, at the intersection of the horizontal ribs and the vertical ribs, a curved portion or an inclined surface connects both sides of the vertical ribs and the horizontal ribs to form a thick connection portion, and the second molding die and Provided on a slide type. In this case, the projecting portion of the slide mold is made to project at least in the clamped state at a position closer to the center of the bumper face in the longitudinal direction than the rounded or inclined portion of the second molding die.

According to the second aspect of the present invention, both sides of the vertical rib and the horizontal rib are formed at the intersection of the horizontal rib and the vertical rib by the round portion or the inclined portion of the second molding die and the slide die. They are connected by a curved surface or an inclined surface, and thick connecting portions are formed at the four corners of the intersection. In this case, since the projecting portion of the slide mold projects at least in the clamped state from the rounded portion or the inclined portion of the second molding die toward the center of the bumper face in the longitudinal direction, the vertical rib and the bumper face vertical surface portion are formed. The molding material does not intrude into the gap between the back surface and the gap, and the gap is reliably formed. Therefore, the provision of a molding die for molding a bumper that is strong against impact as described in claim 1 is realized.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

3 to 5 show a vehicle bumper 1 according to an embodiment of the present invention. The bumper 1 is integrally formed of resin and includes a bumper face 3 extending in the vehicle width direction while being mounted on a vehicle body. The bumper face 3 extends in the vehicle width direction and has a curved bumper face vertical surface portion 3a whose central portion protrudes toward the vehicle body side, and extends from both upper and lower ends of the bumper face vertical surface portion 3a to the back side of the bumper face vertical surface portion 3a. Bumper face upper surface 3b and bumper face lower surface 3
c is a U-shaped section integrally formed.

On the back of the bumper face vertical surface 3a, three horizontal ribs 5 extending in the longitudinal direction of the bumper face are provided.
Are integrally formed so as to protrude horizontally with an interval in the vertical direction. The bumper face vertical surface 3a
On the back surface, four vertical ribs 7 extending in the vertical direction are integrally formed so as to be symmetrical on both the left and right sides with respect to the center in the longitudinal direction of the bumper face, two by two. A vertical direction at the end of the bumper face in the longitudinal direction of the bumper face, a direction perpendicular to the longitudinal direction of the bumper face. It is integrally formed with each horizontal rib 5 at a distance from the back surface of the bumper face vertical surface portion 3a so as to have. In this manner, the gap 9 is formed because the vertical ribs 7 are connected to the rear surface of the bumper face vertical surface portion 3a, so that sinks are generated on the surface of the bumper face vertical surface portion 3a due to a difference in heat shrinkage during the molding, and the bumper face 3 is formed. This is in order to eliminate the situation where the appearance of the camera deteriorates.

As a feature of the present invention, as shown in enlarged detail in FIGS.
At the intersection with the both sides of the vertical rib 7 and the horizontal rib 5 are connected by a curved surface 11a, that is, the four corners of the intersection are rounded, and the thick walled connecting portion 11 is formed by this round. I have. The connecting portion 11 is provided on the curved surface 1.
In addition to 1a, both sides of the vertical rib 7 and the horizontal rib 5 may be connected by an inclined surface.

As described above, since the intersection between the horizontal rib 5 and the vertical rib 7 is reinforced by the thick connecting portion 11, even if a collision impact acts on the connecting portion 11, Is not cracked, and damage to the bumper 1 can be prevented. Moreover, by reinforcing the intersection, the horizontal rib 5
The overall rigidity can be ensured, and even if there is a gap 9 between the vertical rib 7 and the back surface of the bumper face vertical surface 3a, the reinforcing effect of the horizontal rib 5 can be ensured.

The bumper 1 as described above is formed by using a forming die 13 shown in detail in FIG. FIG.
FIG. 6A is a partially enlarged view of a molding die 13 for molding the bumper 1 on the right side from the center in the longitudinal direction of the bumper face in FIG. The mold 13 includes a first mold 15 as a fixed mold, a second mold 17 as a movable mold, and a slide mold 1.
The first molding die 15 is a die for molding the surface of the bumper face vertical surface 3a. The second
The molding die 17 is located on the back of the bumper face vertical surface 3a,
This is a mold for molding the upper and lower surfaces of the horizontal ribs 5 and one side surface of the vertical ribs 7 on the side opposite to the longitudinal direction of the bumper face, and at the time of molding, the direction of the solid arrow E perpendicular to the longitudinal direction of the bumper face shown in FIG. From the first molding die 15 while the mold is closed, and at the time of demolding after molding, the mold is separated from the first molding die 15 in the direction of a dashed arrow F orthogonal to the longitudinal direction of the bumper face shown in FIG. It is designed to open. The slide mold 19 is a mold for molding the back surface of the bumper face vertical surface portion 3a, the upper and lower surfaces of the horizontal ribs 5, and the other side surface of the vertical rib 7 on the central side in the longitudinal direction of the bumper face. As shown by the solid arrow G, the slider slides in a direction perpendicular to the longitudinal direction of the bumper face to approach the first molding die 15 and then slides from the central portion in the longitudinal direction of the bumper face toward the opposite central portion in the longitudinal direction of the bumper face. On the other hand, at the time of demolding after molding, FIG.
(A), as shown by a dashed arrow H, slides from the center portion of the bumper face in the longitudinal direction opposite to the longitudinal direction of the bumper face, and then slides in the direction orthogonal to the longitudinal direction of the bumper face to form the first molding die. 15 away. The operation of the slide mold 19 is performed before the mold clamping, that is, before the second mold 17 approaches the first mold 15 so as not to hinder the operation.

In addition, since the bumper face 3 has a center portion in the vehicle width direction of the bumper face vertical surface portion 3a curved toward the opposite side of the vehicle body, the slide die 19 is directed toward the center portion in the longitudinal direction of the bumper face when the mold is removed. When sliding, the slide mold 19 moves in a direction away from the back surface of the bumper face vertical surface 3a, so that the slide mold 19 can slide easily. If the slide mold 19 is arranged on the opposite side of the longitudinal rib 7 in the longitudinal direction opposite to the center of the bumper face (the right side in FIG. 2A), the slide mold 19 is disengaged from the vertical rib 7 when the mold is removed. Since it slides while rubbing the back surface of 3a, it cannot be removed.

At the tip of the slide mold 19 on the side of the first molding die 15, a projection 21 is provided so as to protrude from the center part of the bumper face in the longitudinal direction, and this projection 21 is attached to the second molding die 17.
, And extends laterally (on the side opposite to the center in the longitudinal direction of the bumper face) from the vertical rib forming surface. Then, a gap 9 is formed between the vertical rib 7 and the back surface of the bumper face vertical surface 3a from the projecting portion 21.

As shown in FIG. 2B, the vertical rib forming surface of the second forming die 17 and the vertical rib forming surface of the slide die 19 correspond to the intersection of the horizontal rib 5 and the vertical rib 7. As a result, the round portions 23 and 25 are formed.
At the intersection of the horizontal rib 5 and the vertical rib 7
Are connected to the lateral ribs 5 by curved surfaces 11a to form thick connecting portions 11. The projecting portion 21 of the slide mold 19 projects at least in the clamped state toward the center of the second molding die 17 away from the round portion 23 in the longitudinal direction of the bumper face, and the vertical rib 7 and the bumper face vertical surface The gap 9 can be reliably formed by preventing the intrusion of the forming raw material into the space between the back surface 3a and the molding material 3a. Thus, the protrusion 21 of the slide die 19
Is made to project laterally beyond the round portion 23 of the second mold 17 if the amount of protrusion of the above-mentioned protrusion 21 is reduced so that the tip of this protrusion 21 is longer than the above-mentioned round portion 23 in the bumper face longitudinal direction. When extending to the center side,
A gap is formed between the tip of the protruding portion 21 and the round portion 23, and the molding material infiltrates into this gap, so that the gap 9 can be formed between the vertical rib 7 and the back surface of the bumper face vertical surface 3 a. At the same time, the portion of the second molding die 17 facing the protruding portion 21 is located between the vertical rib 7 and the bumper face vertical surface 3a after molding. This is because there is a problem that the mold cannot be opened. On the other hand, the other round part 2
On the fifth side, the slide die 19 is separated from the formed bumper 1 only by sliding the slide mold 19 from the side opposite to the center in the longitudinal direction of the bumper face toward the center in the longitudinal direction of the bumper face, so that the above-described problem does not occur. Note that, instead of the round portions 23 and 25, a triangular inclined portion is
May be formed corresponding to the intersection of the vertical rib 7 and the vertical rib 7, and in this case, the formed connecting portion 11 becomes an inclined surface.

In order to mold the bumper 1 using the molding die 13 configured as described above, first, the second molding die 17 is moved from the first molding die 15 as shown by a broken arrow F in FIG. When the mold is opened, the slide mold 19 is moved to the position shown in FIG.
As shown by a solid line arrow G, the first molding die 15 is slid in a direction orthogonal to the longitudinal direction of the bumper face to approach the first molding die 15, and then slid toward the center of the bumper face in the longitudinal direction. . Next, the second molding die 17 is approached to the first molding die 15 from the direction of the solid line arrow E shown in FIG. 2A and clamped, and the molding material is injected into the mold to form the bumper 1. After molding, the second mold 1
7 in the direction of the dashed arrow F shown in FIG.
Open the mold away from 5. Next, the slide mold 19 is slid from the center of the bumper face in the longitudinal direction to the center of the bumper face in the longitudinal direction as shown by a broken line arrow H in FIG. The bumper 1 is slid away from the first molding die 15 and the molded bumper 1 is released.

Therefore, despite the presence of the gap 9 between the vertical rib 7 and the bumper face vertical surface 3a, the intersection of the horizontal rib 5 and the vertical rib 7 has a thick connecting portion 11
The bumper 1 which is reinforced by the above and is strong against impact can be formed.

[0026]

As described above, according to the first aspect of the present invention, the horizontal rib and the vertical rib intersect and are integrally formed on the back surface of the vertical surface of the bumper face, and the vertical rib and the bumper face vertical are formed. In a bumper in which a gap is formed between the surface rib and the rear surface, both sides of the vertical rib and the horizontal rib are connected by a curved surface or an inclined surface at an intersection of the horizontal rib and the vertical rib, and this connection portion is thickened. Since it is molded, the intersection can be reinforced with a thick connecting portion to provide a bumper that is strong against impact.

According to the second aspect of the present invention, since the projecting portion of the slide mold projects in the clamped state at least from the longitudinal rib forming surface of the second mold to the center of the bumper face in the longitudinal direction, The gap between the vertical rib and the rear surface of the bumper face can be reliably formed by preventing the raw material from entering between the vertical rib and the rear surface of the bumper face. As described above, a bumper that is strong against impact can be formed.

[Brief description of the drawings]

FIGS. 1A and 1B show a vehicle bumper according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view taken along line AA of FIG. 3, and FIG.
FIG. 4 is a cross-sectional view taken along line BB of FIG.

2A and 2B show a mold for a vehicle bumper according to an embodiment of the present invention, wherein FIG. 2A is a view corresponding to FIG. 1A and FIG. 2B is a cross-sectional view taken along line CC of FIG. .

FIG. 3 is a sectional view taken along line DD in FIG. 4;

FIG. 4 is a front view showing a right half of the vehicle bumper according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view schematically showing an entire vehicle bumper according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bumper 3 Bumper face 3a Bumper face vertical surface part 3b Bumper face upper surface part 3c Bumper face lower surface part 5 Horizontal rib 7 Vertical rib 9 Gap 11 Connection part 11a Curved surface 13 Mold 15 Mold 1 17 Mold 2 Slide 19 Projection 23, 25 R

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // B29L 31:30 F term (reference) 4F202 AG28 AH24 AM34 CA01 CB01 CK42 CK54 4F204 AG28 AH24 AM34 EA03 EB01 EF27 EK01 EK24 EK25

Claims (2)

[Claims] 1. A curved bumper face vertical surface portion extending in the vehicle width direction and having a central portion protruding toward the vehicle body side, a bumper face upper surface portion extending from upper and lower ends of the bumper face vertical surface portion to the rear side of the bumper face vertical surface portion, and A bumper face having a U-shaped cross section formed integrally with a lower surface of the bumper face; a lateral rib extending in a longitudinal direction of the bumper face integrally formed so as to protrude horizontally on the back of the vertical surface of the bumper face; At the end of the bumper face in the longitudinal direction from the center in the direction perpendicular to the lateral ribs, and extending in the direction perpendicular to the longitudinal direction of the bumper face, and having a gap between the bumper face and the rear surface of the vertical surface of the bumper face. A resin bumper for a vehicle, comprising a rib and a vertical rib integrally formed, A vehicle bumper characterized in that both sides of the vertical rib and the horizontal rib are connected by a curved surface or an inclined surface at an intersection of the horizontal rib and the vertical rib, and the connection portion is formed thick. 2. A curved bumper face vertical surface portion extending in the vehicle width direction and having a central portion protruding toward the vehicle body side, a bumper face upper surface portion extending from upper and lower ends of the bumper face vertical surface portion to the rear side of the bumper face vertical surface portion, and A bumper face having a U-shaped cross section formed integrally with a lower surface of the bumper face; a lateral rib extending in a longitudinal direction of the bumper face integrally formed so as to protrude horizontally on the back of the vertical surface of the bumper face; At the end of the bumper face in the longitudinal direction from the center in the direction perpendicular to the lateral ribs, and extending in the direction perpendicular to the longitudinal direction of the bumper face, and having a gap between the bumper face and the rear surface of the vertical surface of the bumper face. Molding to form a resin bumper made of resin consisting of ribs and longitudinal ribs integrally molded A first molding die for molding the surface of the bumper face vertical surface portion, and a back surface of the bumper face vertical surface portion and a lateral rib which are in contact with and separated from the first molding die in a direction orthogonal to the longitudinal direction of the bumper face. A second molding die for molding one side surface of the upper and lower surfaces and the longitudinal rib on the side opposite to the center of the bumper face in the longitudinal direction; and a direction perpendicular to the longitudinal direction of the bumper face after sliding toward the center of the bumper face in the longitudinal direction when the mold is released. A slide mold that slides and forms the back surface of the bumper face vertical surface, the upper and lower surfaces of the horizontal ribs, and the other side of the longitudinal rib on the center side in the longitudinal direction of the bumper face. The slide mold includes the vertical rib and the bumper face. The protruding portion for forming a gap between the vertical surface portion and the rear surface of the bumper face is located at the center of the bumper face in the longitudinal direction opposite to the vertical rib forming surface of the second mold. The second molding die and the slide die are thickened by connecting both sides of the vertical rib and the horizontal rib at the intersection of the horizontal rib and the vertical rib with a curved surface or an inclined surface. The protrusion of the slide die is provided at least on the side closer to the center of the bumper face in the longitudinal direction than the radius or the slope of the second molding die in a clamped state. A molding die for a vehicle bumper, which is protruding.