JPH0524491A - Resinous bumper and forming die thereof - Google Patents

Abstract

PURPOSE:To provide a resinous bumper having a large impact absorbing ability to external impact in a bumper corner part. CONSTITUTION:A resinous bumper 1 is constituted in such a way that horizontal directional ribs 2a and 2b are arranged on the reverse 1a of a bumper under an above/below opposing condition, and a vertical directional rib 3 is arranged in a bumper corner part between the horizontal directional ribs 2a and 2b, and the vertical directional rib 3 is arranged so as to turn in the orthogonal direction or in the approximately orthogonal direction to the tangent line in the bumper corner part, and is also arranged so as to separate from the reverse 1a of the bumper by a spatial part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin bumper used for shock absorption in a front part and a rear part of a vehicle, and molding of the resin bumper used for molding the resin bumper. It is about the type.

[0002]

Bumpers used for shock absorption at the front and rear of a vehicle are made of a conventional chrome-plated product made of a ferrous material, and are molded with a resin for weight reduction and appearance design improvement. It is changing into goods.

FIG. 4 shows an example of a conventional resin bumper part. The resin bumper part 51 is
It has a projecting portion 51a on the end side and a rib 51b inside the side surface of the bumper.

As a molding die used for molding the resin bumper component 51 having such a structure, there is, for example, one shown in FIG.

The mold 52 shown in FIG. 5 has a cavity 57 formed between a movable mold 53 which moves up and down and a fixed mold 56 which is fixed on a base 54 and has a gate 55 through which a molding material is injected. The resin bumper part 51 is molded by means of, and in the figure, 58 is a dual structure ejector plate that moves up and down along a guide pin 60 in a storage chamber 59 formed in the movable mold 53, and 61 is a movable mold. A return pin that penetrates downward 53 and pushes the ejector plate 58 to the upper end side of the guide pin 60 by abutting the tip of the movable die 53 on the upper surface of the fixed die 56 while the movable die 53 is located at the bottom dead center. Reference numeral 63 designates a sliding member which is slidable in the ejector plate 58 inward and outward of the die, and 64 is slidable relative to the movable die 53 with its lower end inclined inward. An inclined rod 65 which is held and whose upper end is attached to the sliding member 63 is a lateral groove portion which is divided so that it can be separated downward from the movable die 53 and which forms an overcut portion 51a and an undercut portion 65a and a rib 51b. A split type having 65b and the lower end of the inclined rod 64 fixed, 66 is the ejector plate 58
Is an ejector pin for releasing a molded product, which is fixed to the mold and penetrates the movable mold 53 downward.

The movable die 53 and the fixed die 56 are
Flow path 53 for cooling liquid or the like for cooling the resin bumper component 51
a and 56a are provided in large numbers. Further, the vertical dividing surfaces of the movable die 53 and the dividing die 65 are inclined surfaces in the same direction as the axial direction of the inclined rod 64.

Then, the resin-made bumper component 51 is molded by the molding die 52 having the above-mentioned structure, and the movable die 53 is formed.
When the resin bumper part 51 attached to the movable mold 53 is released, the ejector plate 58 is moved downward by the operation of a drive mechanism (not shown) of the pushing rod 67 as shown in FIG. When pushed down in the direction, the ejector pin 66 pushes out the bottom surface side of the resin bumper component 51 at its tip, and at the same time, the upper end of the inclined rod 64 also slides in the mold inward direction (rightward in FIG. 6) by the sliding portion 63. The split mold 65 is pushed down in the axial direction while being moved.

At this time, since the split mold 65 is pushed down in the axial direction of the tilt rod 64 whose lower end side is tilted inward, the resin bumper part 51 is pushed downward and also in the mold inward direction. Moving.

Therefore, the protrusion 51a and the rib 5 of the resin bumper part 51 are moved along with the movement in the mold.
By separating the undercut portion 65a and the lateral groove portion 65b from 1b in the horizontal direction, the resin bumper component 5
1 can be released in the downward direction of the movable die 53.

FIG. 7 shows another example of a conventional resin bumper part. This resin bumper part 71 is
The structure has an overhang 71a on the end side and a rib 71b inside the front side of the bumper.

As a molding die used for molding the resin bumper part 71 having such a structure, there is, for example, one shown in FIG.

A molding die 72 shown in FIG. 8 is provided with an ejector plate storage chamber 73 having an upper opening and a movable die 74 which can be moved up and down, and a gate 76 which is fixed on a base 75 and is used for injecting a molding material. A cavity 78 is formed between the fixed mold 77 and a protruding portion 71a protruding inward of the mold.
And a resin-made bumper part 71 having a bottom side rib 71b.

Inside the ejector plate storage chamber 73 of the movable die 74, there is provided a guide pin 80 fixed vertically between the plate 79 provided on the upper side of the movable die 74. A dual structure ejector plate 81 that moves up and down while being guided is stored.

The ejector plate 81 is provided with a return pin 8 having its tip end side penetrated through the lower surface of the movable die 74.
2 and an ejector pin 83 are provided, and the return pin 82 functions to raise the ejector plate 81 by bringing the tip into contact with the upper surface of the fixed die 77 when the movable die 74 descends. The ejector pin 83 has a function of pushing the resin bumper component 71 downward (release direction) at its tip as the ejector plate 81 pushed down by the pushing rod 84 descends.

Further, the ejector plate 81 has a sliding member 85 incorporated therein in a slidable state in a direction substantially perpendicular to the mold releasing direction of the resin bumper component 71 (inward and outward directions of the mold), and the sliding member 85. An inclined rod 86 having an upper end attached to the moving member 85, and a fixed rod 87 whose axial direction is the mold release direction of the resin bumper component 71 are provided.

The inclined rod 86 has its lower end inclined toward the inside of the mold, and an insertion hole 88 formed in the movable mold 74.
A slide block of a split mold 90 in which a guide bush 89 is fitted and held slidably with respect to the guide bush 89, and a lower end which penetrates the lower surface of the movable mold 74 is divided from the movable mold 74. It is fixed at 91.

The split mold 90 is divided from the movable mold 74 so as to be separable downward, and is divided into a slide block 91 on the extruding side as the upper stage and an extruding block 92 on the extruding front side as the lower stage. It is divided.

An undercut portion 91a forming an overhanging portion 71a between the slide block 91 and the movable die 74 is provided at the upper end of the die outside the die, and one extruding block 92 is provided on the movable die 54. It is fixed to the tip of a fixed rod 87 that penetrates the slide block 91.

Further, the vertical dividing surfaces of the slide block 91 and the extrusion block 92 and the movable die 74 are
It has an inclined surface in the same direction as the axial direction of the inclined rod 86. Further, the movable mold 54 and the fixed mold 57 are respectively formed with a large number of flow paths 74a and 77a through which cooling water or the like for cooling the resin bumper component 71 flows.

A resin bumper part 71 is formed between the movable mold 74 and the fixed mold 77, and after the movable mold 74 is raised, the resin bumper attached to the lower side of the movable mold 74. In order to release the part 71, first, the push rod 84 is operated by a drive mechanism (not shown),
The ejector plate 81 is pushed downward (in the direction of releasing the resin bumper part 71). As a result, as shown in FIG. 9, by this pushing down, the ejector pin 83 projects from the lower surface of the movable die 74 and pushes out the bottom surface side of the resin bumper component 71, and at the same time, the pushing block 92 together with the fixing rod 87 also the resin bumper component. 71 is pushed downward, and further, the tilt rod 86 is moved by the sliding member 85 at the upper end in the mold direction, while the slide block 91 is moved.
Push in the axial direction.

At this time, the slide block 91 pushed out by the inclined rod 86 which holds the lower end side in the inward direction of the mold is separated from the dividing surface with the movable die 74 and the dividing surface with the extruding block 92. It slides and moves inward with respect to the resin bumper part 71.

Therefore, since the extrusion block 92 pushes out the resin bumper component 71 only in the releasing direction, it does not contact the rib 71b provided on the bottom surface side, and one slide block 91 contacts the rib 71b. Since it moves in the direction away from the resin bumper component 71 on the upper side that does not move, the resin bumper component 71 is not moved.
The protruding portion 71a of the slide block 91 and the undercut portion 91a of the slide block 91 can be moved to a position where they are completely separated from each other, and the resin bumper component 71 can be released from the movable die 74 in the downward direction.

[0023]

However, in the resin bumper parts 51 and 71 shown in FIGS. 4 and 7, although the ribs 51b and 71b are provided near the bumper corners, the ribs are provided at the bumper corners themselves. However, there is a problem that the impact absorption capacity of the corner portion against external impact must be small.

In the conventional molds 52 and 72, when the horizontal or vertical ribs 51b and 71b are formed in the vicinity of the corners away from the bumper corners, it is possible to release the molds after molding. However, there is a problem in that even if ribs are provided on the corners themselves, it becomes difficult to release the mold after molding, and there has been a problem to solve these problems.

[0025]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and in particular, a resin bumper having a large impact absorbing ability against an external impact at a corner portion of a bumper can be obtained, and the resin bumper after being molded by a molding die can be obtained. It is an object of the present invention to provide a resin bumper (including a case of a resin bumper part) that can be easily released from the mold and a molding die thereof.

[0026]

A resin bumper according to the present invention (including a case of a resin bumper part) is provided with a horizontal rib which is vertically opposed to the back surface of the bumper on the back surface of the bumper. Vertical ribs are provided between the horizontal ribs provided at the bumper corner portions and facing each other, and the vertical ribs are oriented in a direction orthogonal or substantially orthogonal to the tangential direction of the bumper corner portions. The molding die of the resin bumper according to the present invention (including the case where the bumper is a component for the resin bumper) is characterized in that it is provided apart from the back surface of the bumper. A bumper for forming a bumper, which is used for molding a bumper, and includes a molding die for forming a cavity for molding a resin bumper. In the molded portion of the inner portion, a cavity for molding one of the vertical ribs facing the bumper front side bumper back surface is formed, and a slide die that reciprocates toward the bumper center side along the horizontal ribs, The present invention relates to the resin bumper and the molding die therefor, characterized in that it is provided with a block die that forms a cavity for molding the other surface of the vertical rib facing the bumper side surface side bumper back surface. Is a means for solving the above-mentioned conventional problems.

[0027]

Since the resin bumper according to the present invention has the above-mentioned structure, it has a remarkably large impact absorbing ability against an external impact at the corner portion, and the vertical ribs are thick. Even if the vertical ribs are provided, since the vertical ribs are provided away from the back surface of the bumper, shrinkage does not occur at the time of solidification after molding, the appearance quality is improved, and the thick vertical wall The use of the directional ribs further improves the impact absorbing ability, and in the case of obtaining the same impact absorbing ability as the conventional one, it is advantageous for thinning, weight saving and cost reduction.

Further, since the resin bumper molding die according to the present invention has the above-mentioned constitution, the vertical rib is formed in the cavity formed by the block die and the slide die, and after the formation, By sliding the slide die along the horizontal rib toward the center of the bumper, the resin bumper can be easily released.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The resin bumper 1 shown in FIG.
And a horizontal rib 2 protruding toward the back surface 1a of the bumper.
a and 2b are provided so as to face each other in the vertical direction, and a vertical rib 3 is provided between the horizontal ribs 2a and 2b provided at the corners of the bumper and facing each other, and the vertical rib 3 is a tangential direction of the bumper corner portion. With respect to the direction orthogonal to or substantially orthogonal with respect to that, in other words, in the radial direction of the bumper corner portion, and provided with a space portion 4 spaced apart from the bumper rear surface 1a, and a mounting portion 5 at the end portion of the bumper side surface. The structure is provided.

FIG. 2 shows an embodiment of the resin bumper molding die according to the present invention, which is used for molding the resin bumper 1 having the structure shown in FIG.

Mold 11 for resin bumper shown in FIG.
Is a movable die 13 that has an ejector plate storage chamber 12 with an upper opening and is movable up and down.
Core mold 1 that is the back side molding mold of the bumper fixed to the bottom of the
4, the core mold 1 is provided with a fixed mold 16 which is a bumper front side molding mold which is fixed on the base 15 and which is also provided with a gate for injection of a molding material (not shown).
A cavity 17 can be formed between the fixed mold 4 and the fixed mold 4.

An ejector plate 21 that moves up and down while being guided by a guide pin (not shown) is housed in the ejector plate housing chamber 12 of the movable die 13. The ejector plate 21 is provided with a space for separating the resin bumper 1. A sliding member 22 that is slidable in a direction substantially perpendicular to the mold direction (left-right direction in FIG. 2);
2 is provided with an upper end and an inclined rod 23 whose axial direction is inclined with respect to the mold release direction of the resin bumper 1 and a vertical rod 24 whose axial direction is the mold release direction of the resin bumper 1. The plate 21 is provided with a long hole 22a through which the tilt rod 23 can move, and a through hole 22b into which the vertical rod 24 is inserted.

The tilted rod 23 is slidable in the tilted through hole 25 provided in the movable mold 13 in the tilted direction with the lower end side tilted toward the mold, and the vertical rod 24 is In the vertical through hole 26 provided in the movable die 13, it is slidable in the vertical direction.

Further, one of the vertical ribs (ribs in the direction perpendicular to the paper surface or the screen in FIG. 2) 3 facing the bumper front side bumper rear surface 1a-1 is formed in the bumper corner portion molding portion of the core mold 14. Cavity 1 for molding 3a
A slide die 27 that forms the outer peripheral surface 7 and reciprocates toward the center of the bumper along the horizontal ribs 2a and 2b; and the bumper side surface side bumper back surface 1 of the vertical ribs 3.
It has a block mold 28 forming a cavity 17 for molding the other surface 3b facing a-2.

At the upper end of the slide die 27, there is provided an undercut portion 27a forming an overhanging portion 1b with the movable die auxiliary portion 13a, and a block die fitting to which the block die 28 is fitted. A joining portion 27b is provided, and the upper end portion of the slide die 27 is connected to the lower end of the tilt rod 23.

Further, the block die 28 is provided with a guide portion 28a which fits into a block die fitting portion 27b formed on the slide die 27, and the block die 28 is connected to the lower end of the vertical rod 26. I am doing it.

Then, the slide die 27 and the core die 14
The contact / separation surface with respect to is inclined in the same direction as the axial direction of the inclined rod 23, and
The contact / separation surface between the block die 28 and the block die 28 is the same as the surface direction of the vertical rib 3, and the core die 14 and the fixed die 1
A large number of cooling water flow paths for flowing cooling water and the like for cooling the resin bumper 1 are formed in the reference numeral 6.

Next, a procedure for manufacturing the resin bumper 1 using the molding die 11 configured as described above will be described.

Between the core mold 14 and the fixed mold 16 fixed to the movable mold 13, between the slide mold 27 and the fixed mold 16, between the block mold 28 and the fixed mold 16, and between the slide mold 27 and the block mold 28. The resin bumper 1 is molded in the cavity 17 formed between the resin bumper 1 and the resin mold bumper 1 attached to the lower side of the core mold 14 after the movable mold 13 is raised together with the core mold 14. When releasing the
First, by operating a drive mechanism (not shown),
The ejector plate 21 is pushed downward (in the direction of releasing the resin bumper 1).

As a result, as shown in FIG. 3, the ejector pin (not shown) is pushed down by the pressing and the core mold 14 is pressed.
Bumper backside 1 of resin bumper 1 protruding from the underside of
At the same time that a is pushed out, the vertical rod 26 becomes a block type 2
8 is moved downward, and at the same time, the tilt rod 23 also moves the slide die 27 downward.

At this time, the slide die 27, which is moved downward by the inclined rod 23 held with the lower end side inclined toward the mold inward, slides in the direction away from the contact / separation surface with the core die 14. It moves and moves in the mold inward direction along the horizontal ribs 2a and 2b of the resin bumper 1.

Therefore, the protruding portion 1a of the resin bumper 1 and the undercut portion 27a of the slide die 27 are provided.
Can be moved to a position where they are completely separated from each other, and can also be moved to a position where the vertical ribs 3 can be separated, and the resin bumper 1 can be moved to the slide mold 27, the block mold 28, and the core mold 14. Can be released from the mold.

Thereafter, the ejector plate 21 is pushed back upward, and the tilt rod 23 and the vertical rod 26 are pulled up to the movable die 13 side, whereby the slide die 27 and the block die 28 are returned to their original positions.

[0044]

According to the resin bumper according to the present invention, horizontal ribs projecting to the back side of the bumper are provided on the back surface of the bumper in a state of being vertically opposed to each other, and at the corners of the bumper and in the horizontal direction provided in the opposing state. Since the vertical ribs are provided between the ribs, and the vertical ribs are oriented in a direction orthogonal or substantially orthogonal to the tangential direction of the bumper corner portion and are spaced apart from the back surface of the bumper, the bumper corner is particularly preferable. The impact absorption capacity of the part against external impact will be greater than before, and if the impact absorption capacity is the same as before, it is possible to reduce the thickness of the vertical ribs and reduce the weight and The cost can be reduced, and even if the thickness of the vertical ribs is increased to further improve the shock absorption capacity, it is separated from the back surface of the bumper. Therefore, there is no problem of shrinkage occurring at the time of solidification after injection molding as in the case of being directly connected to the back surface of the bumper, and a remarkably excellent effect that a good appearance can be obtained is obtained. Be brought.

According to the resin bumper molding die of the present invention, a molding die for forming a cavity for molding the resin bumper is provided, and the bumper corner molding portion of the bumper back side molding die has a vertical direction. A slide mold that forms a cavity that forms one of the ribs facing the back surface of the bumper front side and reciprocates toward the center side of the bumper along the horizontal ribs; and a bumper side surface bumper of the vertical ribs. Since it has a block mold that forms a cavity for molding the other surface facing the back side, even if it is a resin bumper with vertical ribs at the corners of the bumper, the mold release after molding is easy It is possible to provide impact on the bumper corners by providing vertical ribs on the bumper corners. Significantly excellent effect that is possible to mold the larger the resin bumper Osamuno is provided.

[Brief description of drawings]

FIG. 1 is a partial slope explanatory view showing an embodiment of a resin bumper according to the present invention.

FIG. 2 is a partial vertical cross-sectional explanatory view showing an example of a mold for a resin bumper according to the present invention.

FIG. 3 is a partial vertical cross-sectional explanatory view showing a state when the resin bumper is released from the molding die of the resin bumper shown in FIG.

FIG. 4 is a perspective view showing an example of a conventional resin bumper component.

5 is a vertical cross-sectional explanatory view of a molding die of the resin bumper component shown in FIG.

FIG. 6 is a vertical cross-sectional explanatory view showing a state when the resin bumper component is released from the molding die of the resin bumper component shown in FIG.

FIG. 7 is a slope explanatory view showing another example of a conventional resin bumper component.

8 is a vertical cross-sectional explanatory view of a molding die of the resin bumper component shown in FIG.

9 is a vertical cross-sectional explanatory view showing a state of releasing the resin bumper component from the molding die of the resin bumper component shown in FIG.

[Explanation of reference numerals] 1 resin bumper 1a bumper back surface 2a, 2b horizontal rib 3 vertical rib 3a vertical rib bumper front side one side facing the bumper back surface 3b vertical rib bumper side surface bumper other side facing Surface 4 space part 11 resin bumper mold 14 core mold (bumper back side mold) 16 fixed mold (bumper front side mold) 17 cavity 27 slide mold 28 block mold

Claims (2)

[Claims] 1. A bumper back surface is provided with horizontal ribs projecting to the bumper back surface side in a vertically opposing state, and vertical ribs are provided between bumper corner portions and the horizontal ribs provided in the facing state, A resin bumper characterized in that the vertical ribs are oriented in a direction orthogonal or substantially orthogonal to the tangential direction of the bumper corner portion and are spaced apart from the back surface of the bumper. 2. A molding die for molding the resin bumper according to claim 1, further comprising a molding die forming a cavity for molding the resin bumper, wherein the bumper corner portion molding portion of the bumper back side molding die. Among the vertical ribs, a slide die that forms a cavity for molding one surface of the vertical ribs facing the bumper front side bumper back surface and reciprocates toward the bumper center side along the horizontal ribs; Bumper side mold A resin bumper mold characterized by having a block mold that forms a cavity for molding the other surface facing the bumper back surface.