JP2005047225A - Insert retaining structure of mold, foam molding method, clip for fitting ea material and ea material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert retaining structure of a mold which can retain an insert easily and securely to the inner surface of a mold and allows a pin to be drawn out of a clip easily during mold releasing, a foam molding method using the insert retaining structure, the clip using the structure and the method and an EA material equipped with the clip. <P>SOLUTION: In the insert retaining structure of a mold, a clip securing pin 50 is securely inserted into the clip 40 having a through hole 42 with a stepped part 43 and consequently, the EA material 1 is fitted into the mold 60. Next, a urethane or the like is foam-molded inside the mold 60 and thus the EA material 1 which is buried in the surface part of the mold 60 is manufactured. Since projecting parts 47 are formed on the inner surface of the clip 40, the clip 40 does not budge during foam-molding or the like. The EA material 1 is installed at an automotive door trim or the like through the clip 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an EA material (impact energy absorbing material) and a clip for mounting the EA material. The present invention also relates to a mold insert holding structure and a foam molding method suitable for molding the EA material.

  An EA material made of hard urethane is attached to a door trim of an automobile for energy absorption (EA) at the time of a side collision (side collision). As a method of attaching the hard urethane EA material to the door trim, Japanese Patent Application Laid-Open No. 2001-322507 describes the structure shown in FIGS. 7 is a cross-sectional view showing the EA material mounting structure described in FIG. 7 of the publication, FIG. 8A is a perspective view of the cylindrical body 20 used in this structure, and FIG. 2 is a cross-sectional perspective view of the cylindrical body 20. FIG.

  The cylindrical body 20 is integrally provided with a cylindrical portion 21 and an overhang portion 22. A claw portion 23 is provided inward from the tip of the tube portion 21. A concave portion 27 is provided on the outer peripheral surface of the rod 26 protruding from the trim 31, and the claw portion 23 is engaged with the concave portion 27.

  Note that a slit 24 extends from the tip of the tube portion 21 in a direction parallel to the axial center line of the tube portion 21, and the tube portion 21 can be elastically deformed in the diameter increasing direction.

  To attach the EA material 33 to the trim 31, place the EA material 33 along the surface of the trim 31 so that the rod 26 is inserted into the attachment hole 34 of the EA material 33, and then fit the cylindrical body 20 to the rod 26. Then, the claw portion 23 is engaged with the concave portion 27. Thereby, the overhanging portion 22 presses the peripheral edge portion of the mounting hole 34 of the EA material 33.

  The cylindrical portion 21 has a tapered shape that is easy to insert into the mounting hole 34. When the cylindrical body 20 is mounted on the rod 26, the outer peripheral surface of the cylindrical portion 21 is in close contact with the inner peripheral surface of the mounting hole 34.

  In this EA material mounting structure, since the cylindrical body 20 and the EA material 33 are separate, when attaching the EA material to the trim 31, the work of applying the EA material to the trim 31 Then, two work steps, that is, the work of fitting the cylindrical body 20 to the rod 26 are required, and the work is troublesome.

  The structure shown in FIG. 6 is considered as an EA material attachment structure in which the workability of attaching the EA material to a member such as a trim is remarkably improved. 6A is a cross-sectional view of the EA material mounting structure in a substantially horizontal direction, FIG. 6B is a perspective view of a locking portion of the EA material mounting structure, and FIG. 6C is the EA material. It is a perspective view of the to-be-latched part of this attachment structure.

  An EA material 1 made of a synthetic resin such as rigid urethane foam is attached to a trim (for example, door trim) 2 as a member via a locking portion 3 and a locked portion 4 called a clip. The locked portion 4 is provided on the EA material 1, and the locking portion 3 is engaged with the locked portion 4.

  The locking portion 3 is composed of a pair of protrusions 8 and 8 erected from the trim 2. A claw portion 8a is provided on the side surface of the protrusion 8 in the protruding direction so as to protrude laterally. As the claw portion 8a approaches the substantially semi-cylindrical portion 8b constituting the proximal end side of the protrusion 8, the protruding height toward the side increases. Thereby, the protrusions 8 and 8 can be easily inserted into the opening 12 of the locked portion 4 described later.

  The protrusion 8 is formed of a synthetic resin having elasticity, and the protrusions 8 and 8 can be elastically deformed in the approaching direction.

  The locked portion (clip) 4 includes a cylindrical portion 6, an anchor 5 that protrudes outwardly from the rear end of the cylindrical portion 6, and a flange 7 that protrudes outwardly from the distal end of the cylindrical portion 6. Have The locked portion 4 is provided with a cylindrical opening 12 penetrating the flange 7, the cylindrical portion 6, and the anchor 5 in the axial center line direction. A step 13 is recessed in the direction.

  As shown in FIG. 6A, the locked portion 4 has a cylindrical portion 6 and an anchor 5 embedded in the EA material 1.

  The EA material 1 with the locked portion 4 is attached to the trim 2 by applying the projections 8 and 8 to the trim 2 while inserting them into the openings 12. When the EA material 1 is pressed against the trim 2, the protrusions 8 and 8 are pushed into the opening 12. When the claw portion 8a is pressed against the inner peripheral surface of the opening 12, the protrusions 8 and 8 are inserted into the opening 12 while being bent in the approaching direction. When the claw portion 8a reaches the step portion 13, the protrusions 8 and 8 try to return to the original shape elastically, and the claw portion 8a and the trim 2 sandwich the edge portion of the step portion 13. Further, the outer peripheral surfaces of the substantially semi-cylindrical portions 8 b and 8 b of the protrusions 8 and 8 come into contact with the inner peripheral surface of the opening 12 of the locked portion 4.

  As described above, the EA material 1 can be attached to the trim 2 only by one work process of superimposing the EA material 1 with the locked portion 4 on the trim 2, and the attachment work efficiency is remarkably improved. Further, the claw portions 8a, 8a of the projections 8, 8 and the trim 2 sandwich the edge of the step portion 13, and the outer peripheral surfaces of the substantially semi-cylindrical portions 8b, 8b are in contact with the inner peripheral surface of the opening 12. The EA material 1 is immovable in both the surface direction and the contact / separation direction of the trim 2, and the attachment of the EA material 1 becomes extremely firm.

As shown in FIG. 6A, in the locked portion 4, a part of the flange 7, the cylindrical portion 6 and the anchor 5 are embedded in the EA material 1. As described above, since the locked portion 4 does not penetrate the EA material 1 and the EA material 1 has a sufficient thickness in the vicinity of the locked portion 4, in the vicinity of the locked portion 4. The EA material 1 also has good shock absorption characteristics.
JP 2001-322507 A

  The EA material 1 with the clip (attachment material) 4 is manufactured by holding the clip 4 on the inner surface of the mold with a pin and performing foam molding of urethane or the like in the mold. However, if the clip 4 is pushed and moved by the foaming resin, molding failure occurs. I want to keep the clip firmly in the mold until it foams, but it must be easily removed from the pin when demolding. I want to absorb the variation of the pin and the clip and secure the above-mentioned fitting force stably.

  The present invention can easily and firmly hold the insert on the inner surface of the mold, and can easily be removed from the pin during demolding, and a foam molding method using this structure, It aims at providing the clip which can be used for this structure and method, and EA material provided with this clip.

  The mold insert holding structure according to the present invention is a structure in which an insert is held on the inner surface of the mold, and an insert locking protrusion protrudes from the inner surface of the mold. In an insert holding structure for a mold, wherein an insertion hole into which a stop protrusion is inserted is provided, and the insert is held on the inner surface of the mold by inserting a locking protrusion into the insertion hole Further, at least one of the inner surface of the insertion hole and the outer surface of the locking projection is provided with a convex portion with which the other abuts.

  According to such an insert holding structure of the mold, the insert is held firmly on the mold.

  The foam molding method of the present invention is a foam molding method in which an insert is held on the inner surface of a mold, and a foamed molded body having an insert is molded by foam molding of a synthetic resin in the mold. The insert is held on the inner surface of the mold by the structure of the present invention.

  According to this foam molding method, the insert is prevented from shifting during foam molding, and the yield is improved.

  The clip for attaching an EA material of the present invention is a clip for attaching an EA material to a member, and is an insertion hole into which a clip locking projection provided on the inner surface of a mold for molding the EA material is inserted. In the EA material mounting clip having the above-described configuration, a convex portion with which the clip locking projection abuts is provided on the inner surface of the insertion hole.

  This clip is securely held in the EA material molding die.

  The EA material of the present invention includes the EA material mounting clip of the present invention.

  This EA material with a clip has a high production yield.

  According to the present invention, a molded body having an insert can be molded with a high yield. According to the present invention, the production yield of the EA material provided with the clip for attaching the EA material is improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A is a longitudinal sectional view showing the relationship between an EA material mounting clip and a mold according to one embodiment of the present invention, and FIG. 1B is a partially enlarged sectional view of a mold holding the clip. 2 is an exploded perspective view of the clip. FIG. 3 is a perspective view showing the engagement relationship between the clip and the mold, and FIG. 4 is a cross-sectional view showing a method of attaching the EA material provided with the clip to the trim.

  The EA material attaching clip 40 includes a clip main body 41 and a sealing body 48 attached to one end face (the upper end face in FIG. 1) of the clip main body.

  The clip body 41 is made of an injection molded product of synthetic resin, and has a through hole 42 that penetrates from one end surface (lower end surface in the drawing) to the other end surface (upper end surface in the drawing). In this embodiment, the through hole 42 is a square hole shape, and a clip locking pin 50 described later is a prismatic shape, but these may be a round hole shape and a cylindrical shape.

  The through hole 42 has a large-diameter portion 42a and 42c at one end side and the other end side, and a small-diameter portion 42b between the two. A stepped portion 43 is formed between the small diameter portion 42b and the large diameter portion 42c.

  An outwardly hooked anchor 44 is provided on the other end side of the clip body 41. A flange portion 45 is provided on one end side. A portion adjacent to the flange portion 45 is a tapered portion 46.

  A convex portion 47 is provided on the inner surface of the small diameter portion 42b. In this form, the convex part 47 consists of the rib extended in the insertion / extraction direction of the clip latching pin 50, and is arrange | positioned on both sides on both sides of the center of the small diameter part 42b.

  A sealing body 48 is attached to the end face of the clip body 41 on the anchor 44 side. The sealing body 48 closes the through hole 42 from the upper side in the figure.

  The sealing body 48 has a thin plate shape and is formed separately from the clip main body 41.

  In this embodiment, screw holes 44 a and 48 a are provided in the anchor 44 and the sealing body 48, and the sealing body 48 is fixed to the clip body 41 by hitting the screws 49 through the screw holes 48 a into the screw holes 44 a. However, the sealing body 48 may be attached to the clip main body 41 by an adhesive or ultrasonic welding. The envelope 48 may be smaller than illustrated. The sealing body 48 may be composed of a sheet such as a film having a thickness that does not break.

  You may employ | adopt the clip which has not used the sealing body but has an undercut-shaped hole.

  The EA material 40 is integrated with the EA material 1 so that most of the EA material 40 is embedded in the EA material 1 as shown in FIG. The clip 40 slightly protrudes from the outer surface of the EA material 1 on one end side (flange 45 side), but may be provided in a completely flush manner.

  The EA material 1 is made of a synthetic resin foam such as urethane as in the case of FIG. The EA material 1 with the clip 40 is manufactured by attaching the clip 40 to the molding die via the clip locking pin 50 as the clip locking projection at the time of molding the synthetic resin foam. Since the through hole 42 of the clip 40 is sealed by the sealing body 48 on the anchor 44 side, urethane or the like does not enter the through hole 42.

  The clip locking pin 50 includes a pedestal portion 51, a rectangular column portion 52 erected from the pedestal portion 51, and a tapered portion 53 at the tip of the rectangular column portion 52. The pedestal 51 is fixed to the mold 60 with screws or bolts.

  The rectangular column portion 52 is inserted into the small diameter portion 42b, and at this time, the convex portion 47 is pressed and contracted so as to contact the outer surface of the rectangular column portion 52. Thereby, the clip 40 is firmly held by the mold 60 via the clip locking pin 50, and the clip 40 does not move even during foam molding. Since the clip body 41 is made of synthetic resin, the convex portion 47 is deformed substantially elastically and is in close contact with the clip locking pin 50. After completion of the foam molding, the molded body is easily removed from the mold 60, whereby the EA material 1 with the clip 40 is obtained. The clip 40 can be firmly held on the mold 60, but can be set to a fitting force that can be easily removed when the mold is removed. Further, since the protrusion 47 is fitted by elastic deformation, the clip 40 can be easily pulled out from the pin 50.

  In this way, the EA material 1 is attached to the trim or the like so as to insert the engaging portion 3 protruding from the trim or the like as shown in FIG. 4 into the clip 40 provided on the EA material 1. The structure of FIG. 4 is shown upside down with respect to FIG. The locking portion 3 in FIG. 4 has the same structure as the locking portion 3 in FIG. 6, but may be different.

  In addition, the clip main body 41 of this clip 40 has the through-hole 42, and does not have an undercut part. For this reason, the clip main body 41 can be easily manufactured by injection molding using a mold having a simple structure. In order to make it easy to visually confirm that the sealing body 48 is attached to the clip body 41, the sealing body 48 and the clip body 41 are made of different colors, or a seal or tape of a color different from that of the clip body 41 is sealed. 48 may be applied.

  FIG. 5 is a perspective view of a clip locking pin 50A according to another embodiment.

  The locking pin 50A is provided with convex portions 54, 54 on a pair of both side surfaces thereof. The protrusions 54, 54 are in close contact with the inner surface of the small diameter portion 42 b of the clip 40, so that the clip 40 is firmly held by the mold 60. In this case, it is desirable that the convex portions 47 of the clip 40 are not provided.

  Each of the above forms is an example of the present invention, and the present invention may take forms other than those illustrated. For example, the number of convex portions may be larger than illustrated. The shape of the convex portion may be other than that illustrated. The clip locking pins 50 and 50A may be made of metal or synthetic resin.

  The above clip is for EA material, but the present invention can also be applied to other clips.

It is sectional drawing which shows the engagement relationship of the clip and metal mold | die which concern on one form of this invention.- It is a disassembled perspective view of the clip of FIG. It is a perspective view which shows the engagement relationship of the clip of FIG. 1, and a clip locking pin. It is sectional drawing which shows the engagement relationship of the clip of FIG. 1 provided in EA material, and a latching | locking part. It is a perspective view of the clip locking pin which concerns on another form. It is explanatory drawing of the conventional clip. It is sectional drawing which shows the EA material attachment structure using the clip of FIG. It is explanatory drawing of another conventional clip.

Explanation of symbols

40 clip 41 clip body 42 through hole 43 step portion 44 anchor 45 flange portion 47 convex portion 50, 50A clip locking pin 54 convex portion

Claims (7)

It has a structure in which the insert is held on the inner surface of the mold,
An insert locking projection protrudes from the inner surface of the mold,
The insert is provided with an insertion hole into which the locking projection is inserted,
In the mold insert holding structure in which the insert is held on the inner surface of the mold by inserting a locking projection into the insertion hole,
An insert holding structure for a mold, wherein at least one of the inner surface of the insertion hole and the outer surface of the locking projection is provided with a convex portion that contacts the other.   2. The mold according to claim 1, wherein the insert is an EA material attaching clip for attaching an EA material to a member, and the die is a die for forming an EA material. Insert holding structure. In the foam molding method of holding an insert on the inner surface of the mold, and foaming a synthetic resin in the mold to mold a foam molded body having the insert,
A foam molding method, wherein the insert is held on the inner surface of the mold by the structure according to claim 1. A clip for attaching an EA material to a member,
In the EA material mounting clip having the insertion hole into which the clip locking projection provided on the inner surface of the mold for molding the EA material is inserted,
A clip for attaching an EA material, wherein a protrusion is provided on the inner surface of the insertion hole so that the protrusion for engaging the clip contacts.   5. The clip for attaching an EA material according to claim 4, wherein the clip is made of an injection molded product of synthetic resin.   6. The clip for attaching an EA material according to claim 4, wherein the convex portions are provided on substantially opposite sides across the center of the insertion hole.   An EA material comprising: an EA material main body made of a synthetic resin foam; and the EA material mounting clip according to any one of claims 4 to 6 integrated with the EA material main body.

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