JP2018183970A - Mold structure of vehicle bumper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold structure of a vehicle bumper, capable of reducing the number of specific undercut part-forming slide cores for forming undercut parts.SOLUTION: In the mold structure, a tip 50A of a pushing piece 50 is provided with a projection part 56 projecting toward the side of a stationary side die plate 44, and a protrusion part 58 for forming a hole 32 (undercut part 34) in a flange part 30 provided in an engaging chip 20 of a bumper 10 projects from an undersurface of the projection part 56. An undercut part 34 of the bumper 10 provided in the pushing piece 50 is parted from the pushing piece 50. In this manner, the pushing piece 50, which is provided for parting the bumper 10 from a movable side die plate 46, is used in forming the undercut part 34, hence the number of specific undercut part-forming slide cores for forming undercut parts can be reduced.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a mold structure of a vehicle bumper.

  For example, Patent Document 1 discloses a technique related to a mold structure in which an undercut portion is formed in a resin molded product. Specifically, in this mold structure, a so-called slide core is used, and the slide core slides along a direction orthogonal to the mold opening direction of the mold in a state where the mold is opened. By doing so, an undercut part is formed.

JP 2003-205531 A

  However, in the case of the mold structure in the above prior art, it is necessary to secure the mold thickness of the slide core in order to maintain the mold strength of the slide core, or to ensure the stroke for moving the slide core. For this reason, in the resin molded product shape | molded, the restrictions on a design may be received.

  In view of the above fact, an object of the present invention is to obtain a mold structure of a bumper for a vehicle that can reduce the number of slide cores dedicated to the undercut portion for forming the undercut portion.

  In order to achieve the above object, a mold structure for a vehicle bumper according to claim 1 of the present invention is a vehicle bumper for molding a vehicle bumper using a fixed side mold plate and a movable side mold plate. A mold structure, which is provided on the movable side mold plate, is movable along the mold opening direction of the mold, and is a first undercut portion that intersects the mold opening direction of the mold. A protrusion for forming a hole to be formed in the vehicle bumper, the mold moves while the mold is opened, and the vehicle bumper is pressed to move the vehicle bumper to the movable side mold plate. An extrusion piece to be released from the mold, and provided on the movable side mold plate, and movable along a direction intersecting the mold opening direction of the mold, and the mold moves in a state where the mold is opened. Releasing the second undercut portion formed in the vehicle bumper; and To press the bumper serial vehicle has a slide core for the release from the movable side mold plate with to release the bumper the vehicle from the protrusion.

  In the vehicular bumper mold structure according to the first aspect of the present invention, the movable side mold plate is provided with the pushing piece and the slide core. The extruding piece is movable along the mold opening direction of the mold, moves in a state where the mold is opened, presses the vehicle bumper, and separates the vehicle bumper from the movable side mold plate. It is set to be typed. Here, a protrusion is formed on the extrusion piece, and a hole that is a first undercut portion that intersects the mold opening direction of the mold is formed in the bumper for the vehicle by the protrusion. It is like that.

  On the other hand, the slide core is movable along a direction intersecting the mold opening direction of the mold. And the said slide core moves in the state by which the metal mold | die was opened, and makes the 2nd undercut part formed in the bumper for vehicles release from a movable side mold plate. Furthermore, the slide core moves in a state where the mold is opened, and presses the vehicle bumper to release the vehicle bumper from the protruding portion of the pushing piece and release from the movable side mold plate.

  That is, in the present invention, a protrusion is formed on the extrusion piece to form the first undercut portion formed on the vehicle bumper, and the first undercut portion is formed from the protrusion of the extrusion piece when the vehicle bumper is pressed by the slide core. The peripheral portion of the hole portion is elastically deformed and released (so-called forced removal). As a result, a hole is formed in the vehicle bumper.

  That is, in the present invention, the second undercut portion of the vehicle bumper is released from the slide core by the movement of the slide core along the direction intersecting the mold opening direction of the mold, and is formed on the extrusion piece. Further, the first undercut portion of the vehicle bumper can be released from the pushing piece. Therefore, in this invention, a 1st undercut part can be formed using an extrusion piece and a slide core, without providing the slide core only for an undercut part for forming an undercut part.

  The “direction intersecting the mold opening direction” in the present invention does not include “the direction orthogonal to the mold opening direction”.

  As described above, the vehicle bumper mold structure according to claim 1 has the excellent effect that the number of slide cores dedicated to the undercut portion for forming the undercut portion can be reduced. can get.

It is the disassembled perspective view which looked at the vehicle right side upper part and headlamp of the bumper for vehicles from the diagonally forward side. It is the perspective view which looked at the vehicle right side upper part and headlamp of the bumper for vehicles from the diagonally forward side. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. It is sectional drawing which shows the state by which the metal mold | die to which the metal mold | die structure of the bumper for vehicles which concerns on this embodiment was applied was mold-closed. It is sectional drawing which shows the state by which the metal mold | die to which the metal mold structure of the bumper for vehicles concerning this embodiment was applied was closed, and resin was filled in the cavity. It is sectional drawing which shows the state by which the metal mold | die to which the metal mold structure of the bumper for vehicles concerning this embodiment was applied was opened. It is sectional drawing which shows the state which the metal mold | die to which the metal mold | die structure of the bumper for vehicles which concerns on this embodiment was applied is opened, and a bumper is released. (A)-(B) are main part expansion which shows the state which the metal mold | die with which the metal mold | die structure of the bumper for vehicles which concerns on this embodiment was applied is opened, and the undercut part of a bumper is released. It is sectional drawing. It is sectional drawing which shows the state by which the metal mold | die as a comparative example was closed. It is sectional drawing which shows the state by which the metal mold | die as a comparative example was opened.

  Hereinafter, embodiments of a mold structure of a vehicle bumper according to the present invention will be described with reference to the drawings. For convenience of explanation, an arrow FR appropriately shown in these drawings indicates the front side in the front-rear direction of the vehicle (automobile), and an arrow RH indicates the right side in the width direction of the vehicle. In addition, in the following description, when the vertical, front / rear, and left / right directions are described without special mention, the vertical direction of the vehicle, the front / rear direction of the vehicle, the left / right direction of the vehicle (vehicle width direction) are indicated. To do.

  In general, although not shown, a front bumper cover (hereinafter simply referred to as “bumper”) formed of a resin such as PP (polypropylene) is arranged at the front end of the vehicle so as to extend in the vehicle width direction. Yes. In addition, on both outer sides of the bumper in the vehicle width direction, front fenders are respectively disposed so as to extend along the vehicle front-rear direction, located at outer end portions in the vehicle width direction on the front side of the vehicle. . A headlamp for irradiating light to the front of the vehicle is disposed between the upper part of both sides (left and right) of the bumper in the vehicle width direction and the front fender.

  Here, FIG. 1 is an exploded perspective view showing the upper right portion 12 of the bumper 10 and the headlamp 14. Since the bumper 10 is formed symmetrically with respect to the center in the vehicle width direction, the description of the left side of the bumper 10 is omitted.

  As shown in FIG. 1, a notch 16 (described later) having an opening on the upper side is formed in the upper right portion 12 of the bumper 10, and a headlamp 14 can be arranged in the notch 16. It is said. The headlamp 14 is fixed to a radiator support member (not shown), for example, and the bumper 10 is fixed to the radiator support member so as to cover the headlamp 14 from the outside. As described above, since the notch 16 is formed in the upper right part of the bumper 10, the headlamp 14 is exposed through the notch 16.

  For this reason, the shape of the notch 16 can be changed depending on the vehicle type. By changing the shape of the notch 16, as shown in FIG. 2, as shown in FIG. ) 18 shape changes. That is, by changing the shape of the notch 16 in the bumper 10, the design at the front end of the vehicle is changed.

  As shown in FIG. 1, in the present embodiment, from the outer edge 16 </ b> A located outside the notch 16 formed in the bumper 10 in the vehicle width direction, the upper edge in the vertical direction extends from the upper edge to the center. An engagement piece 20 formed in an arc shape with its lower side protruding so that the tip thereof becomes the apex portion 20A extends into the notch portion 16.

  Further, from the inner edge 16B located on the inner side of the notch portion 16 in the vehicle width direction, it faces the engagement piece 20 and extends into the notch portion 16 from the center in the vertical direction to the lower edge. Toward, a triangular engagement piece 22 whose tip is a top portion 22A projects.

  On the other hand, in the headlamp 14, recesses 24 and 26 are respectively formed facing the engagement pieces 20 and 22 of the bumper 10, and the engagement pieces 20 and 22 of the bumper 10 are respectively engaged in the recesses 24 and 26. (See FIG. 2).

  Here, the retainer 28 formed in accordance with the shape of the recess 24 is fixed in the recess 24 in a state in which it is accommodated. The engaging piece 20 of the bumper 10 is accommodated in the recess 24 and fixed via the retainer 28. For this reason, as shown in FIG. 3, the lower end 20 </ b> C of the engagement piece 20 is formed with a flange portion 30 that protrudes rearward in the bumper 10, and the flange portion 30 has a hole portion 32. It is formed (undercut portion 34).

  On the other hand, the lower end 28 </ b> A of the retainer 28 is formed with a claw portion 36 protruding downward, and the claw portion 36 can be engaged with the hole portion 32. For this reason, when the engagement piece 20 is pressed rearward in a state where the flange portion 30 of the engagement piece 20 of the bumper 10 is in contact with the claw portion 36 from the front side, the flange 30 passes over the claw portion 36 of the retainer 28 and moves to the flange. The hole 32 of the part 30 moves rearward, and the claw 36 of the retainer 28 engages with the hole 32 of the bumper 10. Thereby, the bumper 10 is fixed to the retainer 28.

  Further, the bumper 10 is formed with a flange portion 38 that protrudes toward the rear side of the bumper 10 in a state of being lowered one step from the lower edge 16C of the notch portion 16 (undercut portion 40). The flange portion 38 can be opposed to the lower wall portion 14 </ b> A of the headlamp 14, and the engagement pieces 20 and 22 of the bumper 10 are connected to the headlamp 14 in a state where the bumper 10 is attached to the front end portion of the vehicle. While being fixed in the state of being accommodated in the recesses 24 and 26, the flange portion 38 is disposed to face the lower wall portion 14A of the headlamp 14. In addition to this, the bumper 10 is fixed to the headlamp 14 or the like by a clip or a screw (not shown).

(Configuration of mold structure of bumper for vehicle)
As described above, the bumper 10 is formed by injection molding. For example, FIGS. 4 to 7 are cross-sectional views illustrating the configuration of the mold 42 for molding the bumper 10. As shown in FIG. 4, the mold 42 includes a fixed side mold plate 44 and a movable side mold plate 46. As shown in FIGS. 5 and 6, the movable side mold plate 46 is movable along the horizontal direction (the mold opening direction of the mold 42) and is in contact with and away from the fixed side mold plate 44. To move.

  FIG. 4 shows a state in which the mold 42 is closed, that is, a so-called mold 42 is closed, and the movable side mold plate 46 is in contact with the fixed side mold plate 44. In this state, a cavity 48 is formed between the movable side mold plate 46 and the fixed side mold plate 44. As shown in FIG. 5, the bumper 10 is molded by filling the cavity 48 with resin and cooling.

  Next, as shown in FIG. 6, when the mold 42 is opened, that is, when the mold 42 is opened, the movable side mold plate 46 moves in the direction of the arrow A, and the movable side mold plate 46 is moved to the fixed side. Separated from the template 44. At this time, the bumper 10 moves together with the movable side mold plate 46 in a state of biting on the movable side mold plate 46 side, and is released from the fixed side mold plate 44.

  Thus, after the movable mold plate 46 and the bumper 10 move in the direction of arrow A, the bumper 10 that bites into the movable mold plate 46 side, as shown in FIG. The mold is released from the movable side mold plate 46 by an extruding pin and an extruding plate. When the bumper 10 is released from the movable side mold plate 46, the bumper 10 can be removed from the mold 42.

  In general, although not shown in the drawings, the movable side mold plate and the fixed side mold plate are provided with a taper according to the material of the resin to be molded, and the molded product formed by the movable side mold plate and the fixed side mold plate can be moved. The mold can be released from the side mold plate and the fixed side mold plate. In addition, this draft taper is set so that the opening side used as a parting surface may become wide in a fixed side mold plate and a movable side mold plate.

  For this reason, the molded product is caught in the direction in which the molded product is released from the movable mold plate and the fixed mold plate, such as when the opening side becomes narrower than the removal direction of the movable mold plate and fixed mold plate. Thus, the part that cannot be removed from the movable side mold plate and the fixed side mold plate as it is is a so-called undercut portion. In this case, a separate process for forming the undercut portion is required.

  As shown in FIGS. 3 and 6, in the bumper 10 in the present embodiment, the bumper 10 is formed in the hole 32 formed in the flange portion 30 of the engagement piece 20 of the bumper 10 and the lower edge 16 </ b> C of the notch portion 16. The flange portions 38 become the undercut portions 34 and 40, respectively.

(Operation and effect of the mold structure of the bumper for vehicles)
A process for forming the undercut portions 34 and 40 will be described below. First, a comparative example corresponding to this embodiment will be described. In FIGS. 9 and 10 described below, in order to avoid confusion with the present embodiment, the undercut portions 34 and 40 shown in FIG. 5 in the present embodiment are denoted by the undercut portions 100 and 102, respectively. explain.

  For example, as shown in FIGS. 9 and 10, in the bumper 104, a slide core 108 is used to form a flange portion 106 that becomes the undercut portion 102. For this reason, the slide core 108 is formed with a stepped portion 110 at a portion where the flange portion 106 to be the undercut portion 102 is formed in the bumper 104.

  As shown in FIG. 9, the resin is filled into the cavity 114 in a state where the mold 112 is closed. A part of the bumper 104 molded in the cavity 114 is pressed toward the fixed-side mold plate 116 by the slide core 108 with the mold 112 being opened as shown in FIG.

  Here, since the flange portion 106 of the bumper 104 is an undercut portion 102, the protruding portion that moves along the moving direction of the movable side template 118, such as the extrusion piece 120, moves the flange portion 106. It cannot be released from the side mold plate 118. On the other hand, the slide core 108 moves in a direction of inclining downward as it goes toward the stationary mold plate 116 side.

  For this reason, when the slide core 108 moves toward the fixed side mold plate 116, the position of the stepped portion 110 moves below the flange portion 106, and the bumper 104 is released from the movable side mold plate 118. It becomes possible.

  On the other hand, a slide core 124 is used here in order to form the hole portion 122 to be the undercut portion 100, and the slide core 124 is inclined in a downward direction as it goes to the fixed side template 116 side. It is supposed to move.

  A projection 126 protruding upward is formed at the tip of the slide core 124. As shown in FIG. 9, the tip of the projection 126 is in a state where the mold 42 is closed. The surface 126A comes into contact with the lower surface 120A of the pushing piece 120. A cavity 128 is formed around the protrusion 126 in a state where the front end surface 126 </ b> A of the protrusion 126 is in contact with the lower surface 120 </ b> A of the pushing piece 120. In FIG. 9, the cavity 128 is filled with resin.

  For this reason, when the resin is filled in the cavity 114 formed by the fixed side mold plate 116 and the movable side mold plate 118, the resin is filled in the cavity portion 128 except for the protrusion 126. . As shown in FIG. 10, after the mold 112 is opened, when the slide core 124 moves to the fixed mold plate 116 side, the slide core 124 moves to the fixed mold plate 116 side and moves downward. Moving. That is, since the protrusion 126 moves obliquely downward with the movement of the slide core 124, the hole 122 that becomes the undercut portion 100 is formed.

  On the other hand, in this embodiment, as shown in FIG. 4, in order to form the undercut parts 34 and 40, the extrusion piece 50 and the slide core 52 are used, respectively. In order to release the bumper 10 from the movable side mold plate 46, an extruding piece 50, an ejecting pin, an ejecting plate, or the like (not shown) are used.

  As described above, these members move along the moving direction (substantially horizontal direction) of the movable side mold plate 46, whereas the slide core 52 in this embodiment is directed toward the fixed side mold plate 44 side. As a result, it moves in a direction inclined downward.

  First, the slide core 52 side will be described. In the slide core 52, a step portion 54 is formed at a portion where the flange portion 38 that is the undercut portion 40 in the bumper 10 is formed. Therefore, as shown in FIG. 7, the slide core 52 moves in a direction of inclining downward as it goes toward the fixed side template 44.

  As described in the comparative example, as the slide core 52 moves toward the stationary side template 44 and moves downward, the position of the stepped portion 54 moves below the flange portion 38, and the bumper 10. , The mold can be released from the movable side mold plate 46.

  On the other hand, as shown in FIGS. 4 and 8A, in the present embodiment, a protruding portion 56 that protrudes toward the fixed-side mold plate 44 is formed at the distal end portion 50A of the pushing piece 50. A protrusion 58 protrudes from the lower surface of the protrusion 56. As shown in FIG. 7, a stepped portion 60 that can accommodate the protruding portion 58 is formed on the fixed-side mold plate 44 side. As shown in FIG. 4, the mold 42 is in a closed state. A cavity 49 is provided around the protrusion 58.

  For this reason, as shown in FIGS. 4 and 5, when resin is filled into the cavity 48 formed by the fixed side mold plate 44 and the movable side mold plate 46, the cavity portion 49 is removed except for the protrusions 58. The inside is filled with resin. As shown in FIG. 7, after the mold 42 is opened, the pushing piece 50 moves to the fixed side mold plate 44 side. However, as shown in FIGS. 7 and 8A, the pushing piece 50. The flange portion 30 of the engagement piece 20 of the bumper 10 remains in the state where the flange portion 30 of the bumper 10 is caught.

  From this state, as shown in FIGS. 8B and 8C, the flange 30 of the engagement piece 20 of the bumper 10 is elastically deformed by the movement of the slide core 52 toward the fixed template 44 side. It is released from the protrusion 58 of the pushing piece 50 (so-called forced removal). Thereby, the hole part 32 will be formed in the flange part 30 of the engagement piece 20 of the bumper 10. The flange portion 30 of the engagement piece 20 of the bumper 10 is restored after being released from the protruding portion 58 of the pushing piece 50.

  That is, in this embodiment, as shown in FIGS. 6 and 7, the undercut portion 40 of the bumper 10 is slid by the movement of the slide core 52 along the direction intersecting the mold opening direction of the mold 42. While releasing from the core 52, the undercut part 34 of the bumper 10 formed in the extrusion piece 50 can be released from the extrusion piece 50. FIG.

  As described above, in the present embodiment, the push piece 50 provided for releasing the bumper 10 from the movable side mold plate 46 is used for forming the undercut portion 34, as shown in FIGS. 9 and 10. As a result, the number of slide cores 124 dedicated to the undercut portion can be reduced.

  Therefore, in this embodiment, it is not necessary to secure the mold thickness of the slide core and the stroke for moving the slide core by providing a slide core dedicated to the undercut part, and this limits design restrictions. You will not receive it. That is, according to the present embodiment, the number of parts of the mold 42 can be reduced, and the design of the bumper 10 can be improved.

  As described above, an example of the embodiment of the present invention has been described. However, the embodiment of the present invention is not limited to the above, and one embodiment and various modifications may be used in combination as appropriate. Needless to say, the present invention can be implemented in various modes without departing from the gist of the present invention.

10 Bumper (Vehicle bumper)
32 hole (first undercut)
34 Undercut part (first undercut part)
38 Flange (second undercut)
40 Undercut part (second undercut part)
42 Mold (Vehicle bumper mold structure)
44 Fixed side template 46 Movable side template 50 Extruding piece 52 Slide core 58 Protrusion

Claims (1)

A vehicular bumper mold structure for forming a vehicular bumper using a fixed side mold plate and a movable side mold plate,
A hole provided in the movable side mold plate, which is movable along the mold opening direction of the mold and is a first undercut portion intersecting the mold opening direction of the mold, is used for the vehicle. A protrusion for forming a bumper to be formed, and the die moves when the mold is opened, and pushes the vehicular bumper to release the vehicular bumper from the movable side mold plate; ,
Provided on the movable side mold plate, movable along a direction intersecting the mold opening direction of the mold, and formed in the vehicle bumper by moving the mold in a state where the mold is opened. A slide core for releasing the second undercut portion and pressing the vehicle bumper to release the vehicle bumper from the projection and release from the movable side plate,
A mold structure of a bumper for a vehicle.