JP2019217960A - Air bag lid reinforcement member, metal mold device for manufacture thereof, and manufacturing method - Google Patents

Abstract

To make it possible chiefly to stably embed a hinge member at an on-target position, and so on.SOLUTION: Plural door parts, which are capable of opening and closing, and a flange part, which surrounds an outer periphery of the plural door parts, have a molding space 102 for molding air bag lid reinforcement members, which are formed from separate members, and are respectively connected by a hinge member 54 which has an excess length portion 52, in the interiors of metal molds 103, 104. The air bag lid reinforcement member has, in the molding space 102, plural projection parts 105 for excess length portion formation which respectively form the excess length portion 52 at a position between each door part and the flange part with respect to one hinge member 54 which is so set as to be over the plural door parts and the flange part, and a cutting part 106 which cuts one hinge member 54 into plural pieces according to the plural door parts by mold clamping of the metal molds 103, 104.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an airbag lid reinforcing member, a mold device for manufacturing the same, and a manufacturing method.

  2. Description of the Related Art In vehicles such as automobiles, an airbag device is provided in a vehicle cabin as an emergency safety means. For example, an airbag device for a passenger seat includes an airbag module that folds and accommodates a bag-shaped airbag body, a lid member that covers the airbag module from above, and an airbag grid reinforcing member (for example, And Patent Document 1).

  The airbag lid reinforcing member is attached to the rear surface side of the lid member to reinforce the lid member, accommodates at least a part of the airbag module, and guides the airbag body deployed from the airbag module to the lid member.

  The airbag lid reinforcing member has a door, a flange, a leg, and a hinge. The hinge connects the door to the flange so that the door can be opened and closed. The hinge portion includes one formed by a hinge member formed of another member. The hinge member is embedded in the airbag lid reinforcing member by insert molding.

JP 2017-140951 A

However, the means for manufacturing the air backgrid reinforcing member described in Patent Document 1 has the following problems.
That is, when a hinge member formed of a separate member is used for the hinge portion, for example, the hinge member is buried inside the airbag lid reinforcing member by insert molding, but the hinge member is positioned when the mold is clamped. It has been difficult to stably embed the hinge member at the intended position due to displacement or the like.

  Therefore, an object of the present invention is mainly to solve the above-mentioned problems.

In order to solve the above problems, the present invention provides
A plurality of openable and closable door portions and a flange portion surrounding the outer periphery of the plurality of door portions are formed as separate members, and form an airbag lid reinforcing member connected by a hinge member having an extra length. In a mold apparatus for manufacturing an air back grid reinforcing member having a molding space for performing,
In the molding space, with respect to one hinge member set so as to straddle the plurality of door portions and the flange portion, the extra length is provided at a position between each door portion and the flange portion. A plurality of extra-length portion forming projections each forming a portion,
And a cutting unit that cuts one hinge member into a plurality of pieces in accordance with the plurality of door parts by mold clamping.
Further, the present invention is characterized by a method of manufacturing an air backgrid reinforcing member using the above mold apparatus for manufacturing an air bag grid reinforcing member, and an air back grid reinforcing member.

  According to the present invention, with the above-described configuration, the hinge member can be stably embedded at the intended position.

FIG. 2 is a longitudinal sectional view of the airbag device according to the present embodiment as viewed from the side. FIG. 4 is a longitudinal sectional view of a mold (lower mold) showing a manufacturing process of the airbag lid reinforcing member according to the first embodiment. FIG. 3 is a manufacturing process diagram following FIG. 2. FIG. 4 is a manufacturing process diagram (partially enlarged view) following FIG. 3. FIG. 5 is a partially enlarged longitudinal sectional view of an airbag lid reinforcing member manufactured in the manufacturing process of FIGS. 2 to 4. It is the elements on larger scale of FIG. It is a longitudinal section of a metal mold (lower metal mold) part showing a manufacturing process of an air bag grid reinforcement member concerning Example 2. FIG. 8 is a manufacturing process diagram following FIG. 7. FIG. 9 is a manufacturing process diagram (partially enlarged view) following FIG. 8. It is a modification of FIG. It is another modification of FIG. It is another modification of FIG. FIG. 10 is a partially enlarged longitudinal sectional view of an airbag lid reinforcing member manufactured in the manufacturing process of FIGS. 7 to 9. It is the elements on larger scale of FIG. It is a manufacturing process drawing concerning a comparative example. FIG. 13 is a manufacturing process diagram following FIG. 12. It is a figure showing the situation of the locate pin and the locate hole after molding.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 14 are for describing this embodiment. 2 to 6 show Example 1, FIGS. 7 to 11 show Example 2, and FIGS. 2 to 14 show Comparative Examples.

  <Structure> The structure of this embodiment will be described below.

  FIG. 1 shows an airbag device. The directions in the figure are a vehicle front-rear direction X, a vehicle width direction Y, and a vertical direction Z.

  A vehicle 1 such as an automobile is provided with an airbag device 3 in a vehicle compartment 2 as an emergency safety means. For example, the airbag device 3 for a passenger seat includes an airbag module 5 that folds and accommodates a bag-shaped airbag body 4, a lid member 6, and an airbag lid reinforcing member 31.

  The lid member 6 normally covers the airbag module 5 from above and forms an opening for inflating the airbag body 4 deployed from the airbag module 5 into the vehicle compartment 2 in an emergency. The lid member 6 has a lid portion 21 opened by the airbag body 4 and a lid outer peripheral portion 22 surrounding the outer periphery of the lid portion 21.

  In this embodiment, two lid portions 21 are provided in the vehicle front-rear direction X. The lid portion 21 and the lid outer peripheral portion 22 are defined by a cleavage line 23. The cleavage line 23 is formed as a cut formed on the rear surface side of the lid member 6 to a depth that does not reach the surface of the lid member 6. The lid member 6 includes a member integrated with the instrument panel 8 and a member separate from the instrument panel 8.

  The airbag lid reinforcing member 31 is attached to the back side of the lid member 6 to reinforce the lid member 6, accommodates at least a part of the airbag module 5, and removes the airbag body 4 deployed from the airbag module 5. Guide to the lid member 6.

  The airbag lid reinforcing member 31 has a door portion 32, a flange portion 33, a leg portion 34, and a hinge portion 35. Among these, the door part 32 is attached to the back surface of each lid part 21 to reinforce each lid part 21 and is opened and closed integrally with the lid part 21.

  The flange portion 33 is attached to the back surface of the lid outer peripheral portion 22 while surrounding the outer periphery of the door portion 32, and reinforces the lid outer peripheral portion 22. Welding ribs 36 and 37 for welding to the lid member 6 are provided on the surfaces of the door 32 and the flange 33.

  The leg portion 34 is disposed below the door portion 32 and the flange portion 33 in a state surrounding the upper portion of the airbag module 5. The upper portion of the airbag module 5 is inserted into the leg portion 34 from below, and the leg portion 34 guides the deployed airbag body 4 toward the door portion 32 and the lid portion 21. Functions as a unit. For this purpose, the leg portion 34 has a substantially frame-like shape that extends in the direction of bulging into the vehicle interior 2 around the outside of the door portion 32 and the position on the outer peripheral side of the door portion 32.

  Hook portions 42 are provided on the front and rear side surfaces of the upper portion of the airbag module 5, and locking holes 43 in which the hook portions 42 can be loosely fitted are formed in the leg portions 34. The lower portion of the airbag module 5 is fixed to a vehicle body strength member 44 such as a steering support member provided on the vehicle body using brackets 45 and 46.

  The hinge portion 35 connects the door portion 32 to the flange portion 33 so as to be openable and closable. The hinge portion 35 has a surplus length portion 52 that detours downward. The extra length 52 is substantially U-shaped or substantially V-shaped in a side view. The hinge part 35 is installed at a position inside the leg part 34. The hinge portion 35 includes a hinge member 54 formed of a separate member (separate hinge). As the hinge member 54, a flexible resin net or film, a metal plate such as an iron plate, or the like can be used. In this embodiment, a resin net is used for the hinge member 54. The hinge member 54 is embedded in the airbag lid reinforcing member 31 by insert molding.

  In contrast to the above basic configuration, this embodiment is provided with the following configuration.

<About the mold apparatus 101 for manufacturing the air back grid reinforcing member 31>
The mold apparatus 101 for manufacturing the airbag grid reinforcing member 31 is as shown in FIGS. 2 to 4 (hereinafter mainly referred to as FIG. 3), and a plurality of doors that can be opened and closed as shown in FIG. In order to form the airbag lid reinforcing member 31 in which the portion 32 and the flange portion 33 surrounding the outer periphery of the plurality of door portions 32 are formed by separate members and connected by a hinge member 54 having an extra length portion 52, respectively. Is formed inside the molds 103 and 104.

Then, in the molding space 102, an extra length is provided at a position between each door portion 32 and the flange portion 33 with respect to one hinge member 54 set so as to straddle the plurality of door portions 32 and the flange portion 33. A plurality of extra-length portion forming projections 105 each forming the portion 52;
A cutting portion 106 (FIG. 4) that cuts one hinge member 54 into a plurality of doors 32 in accordance with the plurality of doors 32 by clamping the molds 103 and 104 is provided.

  Here, the manufacturing mold apparatus 101 includes at least two molds 103 and 104, an upper mold and a lower mold, and the molding space 102 is formed between the upper mold and the lower mold. In the drawing, the mold 103 is a lower mold, and the mold 104 is an upper mold. A locating pin 107 for positioning the hinge member 54 at the time of setting is provided inside the molding space 102. The locate pin 107 is provided on the lower die. On the other hand, the hinge member 54 is provided with a locating hole 108 for positioning by fitting the locating pin 107 to the outside at the time of setting in the molding space 102.

  In this embodiment, the extra-length-portion forming protrusion 105 is provided on the upper die. The lower mold is provided with a surplus portion forming recess 109 at a position facing the surplus portion forming protrusion 105. The extra-long portion forming protrusion 105 and the extra-long portion forming recess 109 form an extra-long portion forming portion. The extra length forming recess 109 has substantially the same shape and size as the extra length forming projection 105. The extra-length portion forming recess 109 and the extra-length portion forming protrusion 105 are formed to extend in the width direction of the door portion 32 (a direction perpendicular to the paper surface). By providing the extra-length portion forming protrusions 105 and the extra-length portion forming recesses 109 in this manner, the airbag lid reinforcing member 31 can be molded with the door portion 32 and the flange portion 33 being flush with each other. Becomes possible.

  The cutting section 106 is provided at a position between the plurality of door sections 32. The space between the door portions 32 (between the ends (free ends) on the side opposite to the hinge portion 35) is slightly separated, and the upper and lower dies 103 and 104 are used to separate the door portions 32 from each other. A partition 111 is provided. The partition 111 has a width equal to the interval between the doors 32 and is formed to extend in the width direction of the door 32 (substantially the vehicle width direction Y). The cutting portion 106 is provided inside the substantially flat mating surface of the partition portion 111 (an intermediate position in the vehicle front-rear direction X) so as to extend in the width direction of the door portion 32.

  The cutting section 106 has a cutting blade 112 that cuts the hinge member 54 by a shearing force. In this embodiment, the cutting blade 112 is provided on the upper die. The lower mold is provided with a housing portion 113 that houses the cutting blade 112 at the time of mold clamping at a position facing the cutting blade 112. The accommodating portion 113 is a recess having the same shape and size as the cutting blade 112. The accommodating portion 113 is provided with an edge portion 114 for cutting off the hinge member 54 with the cutting blade 112. The cutting blade 112 and the edge 114 have a sharp shape. The cutting blade 112 and the housing 113 having the edge 114 may be provided upside down, or may be provided both up and down.

<About the manufacturing method of the airbag lid reinforcing member 31>
In the method of manufacturing the airbag lid reinforcing member 31, the plurality of door portions 32 that can be opened and closed and the flange portion 33 that surrounds the outer periphery of the plurality of door portions 32 are formed as separate members and have an extra length portion 52. This is for manufacturing the airbag lid reinforcing members 31 connected by the hinge members 54, respectively.
Then, a step of setting one hinge member 54 having a size straddling the plurality of door parts 32 and the flange part 33 in the opened molds 103 and 104 (setting step, FIG. 2);
A step of forming a plurality of extra lengths 52 on one hinge member 54 when the molds 103 and 104 are clamped (excess length forming step, FIG. 3);
A step of cutting one hinge member 54 into a plurality of sheets in accordance with the plurality of door portions 32 (cutting step, FIG. 4) is performed when or after the mold clamping of the molds 103 and 104 is completed. .

  Here, in the setting step, the hinge member 54 is set on the lower mold (the mold 103). At this time, the positioning of the hinge member 54 is performed by externally fitting the locate hole 108 of the hinge member 54 to the lower mold locate pin 107.

  In the extra length forming step, the upper die (the mold 104) is brought close to the lower die and mold clamping is performed, so that the extra length forming projections 105 partially move the hinge member 54 to the extra length portion. The extra length portion 52 is formed in the hinge member 54 by being pushed into the forming recess 109. The hinge member 54 becomes the extra-long part 52 having a required shape by being sandwiched between the extra-length part forming protrusion 105 and the extra-length part forming recess 109.

  At this time, since the inner portion (portion on the door portion 32 side) sandwiched by the plurality of extra-length portion forming projections 105 is evenly pulled from both sides, the hinge member 54 mainly has the extra-long portion. A portion outside the forming protrusion 105 (a portion corresponding to the flange portion 33) is drawn into the extra-length portion forming recess 109.

  As described above, it is clear which side of the extra long portion forming protrusions 105 of the hinge member 54 is drawn into the extra long portion forming recesses 109, so that the extra long portion forming recesses 109 are formed. The hinge member 54 is always drawn in the same way, and the insert length of the hinge member 54 with respect to the flange 33 after being drawn into the extra length forming recess 109 is stabilized. It becomes easy to set and adjust the length of the flange portion 33 side of 54 in advance.

  Thereby, after the formation of the extra length portion 52, the shape of the hinge member 54 is stabilized on both sides of the extra length portion 52, and the displacement of the hinge member 54 is suppressed, so that the distortion of the hinge member 54 can be eliminated. Moreover, the insert length of the hinge member 54 with respect to the door part 32 and the flange part 33 can be ensured stably.

  In the cutting process, the portion between the plurality of door portions 32 is cut linearly in the vehicle width direction Y by the cutting blade 112 of the cutting portion 106 and the edge portion 114 of the storage portion 113 when the mold clamping is completed. You.

  Thereafter, an injection molding step of injecting the molten resin into the molding space 102 is performed, and a demolding step of releasing the air backgrid reinforcing member 31 from the molds 103 and 104 when the molten resin has hardened to a certain extent in the molding space 102. Done.

<About the air back grid reinforcement member 31>
As shown in FIG. 5, the airbag lid reinforcing member 31 manufactured using the above-described manufacturing die apparatus 101 surrounds a plurality of openable and closable door portions 32 and the outer periphery of the plurality of door portions 32. The flange portion 33 is connected to each other by a hinge member 54 formed of a separate member and having an extra length 52.

  As shown in FIG. 6, the hinge member 54 is exposed to the outside at a position between the plurality of door portions 32 in a state where the hinge members 54 can be abutted.

  Here, the hinge member 54, which can be linearly butted at a position between the plurality of door portions 32, is linearly cut by the cutting portion 106 at the time of mold clamping, so that the hinge portion 54 between the door portions 32 of the cut portion 116 can be cut. The ends of the exposed portions (exposed portions 115) can be butted together.

  In addition, the hinge member 54 is embedded in the door portion 32 in a state where the insert length of each portion of the hinge member 54 with respect to the door portion 32 is stable.

  <Operation> The operation of this embodiment will be described below.

  When the airbag body 4 is deployed and exits the airbag module 5 in an emergency, the airbag body 4 is guided along the legs 34 while inflating and pushes the door 32 and the lid 21 from below. The tearing line 23 is torn by the pressing force of the airbag body 4, the door 32 and the lid 21 are opened centering on the hinge 35, and an opening is formed in the lid member 6. The airbag body 4 protrudes from the opening toward the occupant in the passenger compartment 2 to protect and restrain the upper body of the occupant properly seated on the seat.

  <Effects> According to this embodiment, the following effects can be obtained.

  One hinge member 54 is set inside the molds 103 and 104 so as to straddle the plurality of door portions 32 and the flange portion 33. Thus, the labor for setting the hinge member 54 inside the molds 103 and 104 can be reduced, and the hinge member 54 can be stably set at an accurate position, which is efficient and improves the quality.

  On the other hand, as shown in the comparative examples of FIGS. 12 and 13, the hinge members 54a as small as the number of the door portions 32 are prepared, and the small hinge members 54a are provided inside the molds 103 and 104 for each door portion 32. When setting the hinge members, it takes time to set the hinge members 54 inside the molds 103 and 104 by the number of the small hinge members 54a, and sets each hinge member 54a stably at an accurate position. Is difficult and inefficient. In the comparative example, only one small hinge member 54a is shown.

  Further, when one hinge member 54 is set inside the molds 103 and 104 and the molds 103 and 104 are clamped, a plurality of extra-length portions 52 are simultaneously formed on one hinge member 54. As a result, the tensions F1 to F4 of the respective parts acting on the hinge member 54 inside the molds 103 and 104 to form the extra length portion 52 can be balanced, so that both sides of each extra length portion 52 can be obtained. As a result, the shape of the hinge member 54 is stabilized, and inadvertent displacement of the hinge member 54 is suppressed, so that the distortion of the hinge member 54 can be eliminated. Then, the insert length can be stably secured so that the insert length of the hinge member 54 with respect to the door portion 32 and the flange portion 33 becomes a required length.

  More specifically, in the case of this embodiment, as shown in FIG. 3, the tension F1 and the tension F3 acting on the inside of each extra-length portion forming projection 105 are balanced, and each extra-length portion forming projection 105 is balanced. The tension F2 acting on the outside of the portion 105 is substantially equal to the tension F4.

  On the other hand, as shown in the comparative examples of FIGS. 12 and 13, the hinge members 54a as small as the number of the door portions 32 are prepared, and the small hinge members 54a are provided inside the molds 103 and 104 for each door portion 32. When the extra length 52 is formed, the tension F5 and the tension F6 applied to both sides of the extra length 52 of the hinge member 54a when forming the extra length 52 are dependent on each other. It is unclear which side (the door part 32 side or the flange part 33 side) the portion to be drawn into the projection is formed on the basis of the extra-length portion forming projection 105.

  Therefore, the hinge member 54a after the formation of the extra length portion 52 is likely to be displaced or distorted, and the insert length of the hinge member 54a with respect to the door portion 32 and the flange portion 33 is not stable, so that the required insert length is required. Is difficult to secure.

  For example, when the tension F5 is larger than the tension F6, the door portion 32 side is drawn into the extra length forming recess 109, and the flange portion 33 side sags. Conversely, when the tension F5 is smaller than the tension F6, the flange portion 33 is drawn into the extra-length portion forming recess 109, and the door portion 32 sags.

  In addition, when the hinge member 54a on the door portion 32 is elongated by the tension F5, the locate pin 108 of the hinge member 54 is deformed with respect to the locate pin 107 as shown in FIG. Therefore, the position of the hinge member 54a cannot be maintained in the set state.

  Therefore, in this embodiment, one hinge member 54 is set inside the dies 103 and 104, and one or more hinge members 54 are connected to the plurality of dies 103 or 104 at the completion of or after the dies 103 and 104 are completed. The sheet is cut into a plurality of pieces according to the door portion 32. Since the cut small hinge member 54a is maintained in almost the same state as before the cutting without causing displacement, it can be stably buried at the target position without any trouble, and Since the hinge members 54 are surely cut into a plurality of pieces, the door portion 32 is not hindered from expanding when the airbag body 4 is expanded. In addition, there is no need to cut the hinge member 54 in a later step.

  In addition, the same operation and effect as those of the mold device 101 for manufacturing the air back grid reinforcement member 31 can be obtained also in the air bag grid reinforcement member 31 and the manufacturing method of the air bag grid reinforcement member 31.

  <Structure> The structure of this embodiment will be described below.

  The basic configuration is the same as in the first embodiment. In this embodiment, the following configuration is provided.

<About the mold apparatus 101 for manufacturing the air back grid reinforcing member 31>
The mold apparatus 101 for manufacturing the airbag lid reinforcing member 31 is as shown in FIGS. 7 to 9C (hereinafter, mainly referred to FIG. 8), and a plurality of doors that can be opened and closed as shown in FIG. In order to form the airbag lid reinforcing member 31 in which the portion 32 and the flange portion 33 surrounding the outer periphery of the plurality of door portions 32 are formed by separate members and connected by a hinge member 54 having an extra length portion 52, respectively. Is formed inside the molds 103 and 104.
Then, in the molding space 102, with respect to one hinge member 54 set so as to straddle the plurality of door portions 32 and the flange portion 33, an extra space is provided between each door portion 32 and the flange portion 33. A plurality of extra-length portion forming protrusions 105 each forming the long portion 52;
A weakening portion 121 linearly weakens a portion between the plurality of door portions 32 of one hinge member 54 by closing the molds 103 and 104.

  Here, the manufacturing mold apparatus 101 and the extra-length portion forming projections 105 are the same as those in the first embodiment, and thus description thereof will be omitted (if necessary, the description of the first embodiment will be given. Leverage is described in Example 2).

  The weakening part 121 is provided at a position between the plurality of door parts 32. The space between the door portions 32 (between the ends (free ends) on the side opposite to the hinge portion 35) is slightly separated, and the upper and lower dies 103 and 104 are used to separate the door portions 32 from each other. A partition 111 is provided. The partition 111 has a width equal to the interval between the doors 32 and is formed to extend in the width direction of the door 32 (substantially the vehicle width direction Y). The weakened portion 121 is provided inside the substantially flat mating surface of the partition portion 111 (an intermediate position in the vehicle front-rear direction X) so as to extend in the width direction of the door portion 32.

  The weakened portion 121 is a minute projection for crushing the hinge member 54 by a mold clamping force. The minute protrusion is a protrusion having a slight protrusion amount about the thickness of the hinge member 54. The tip shape of the minute projection may be triangular as shown in FIG. 9, substantially semicircular as shown in FIG. 9A, or trapezoidal as shown in FIG. 9B. Further, as shown in FIG. 9C, the minute projection may be provided at the tip of a projection storage piece 121b which is installed in a recess formed in the molds 103 and 104 by a spring 121a so as to be freely stored. In addition, when the cutting blade 112 in FIG. 4 is worn and the tip is rounded, the cutting blade 112 can be used as the weakened portion 121 as it is.

  In the case of this embodiment, the minute projection of the weakened portion 121 is provided on the upper die. The lower mold has a flat receiving portion at a position facing the minute projection. Note that the microprojection and the receiving portion may be turned upside down.

<About the manufacturing method of the airbag lid reinforcing member 31>
In the method of manufacturing the airbag lid reinforcing member 31, the plurality of door portions 32 that can be opened and closed and the flange portion 33 that surrounds the outer periphery of the plurality of door portions 32 are formed as separate members and have an extra length portion 52. This is for manufacturing the airbag lid reinforcing members 31 connected by the hinge members 54, respectively.
Then, a step of setting one hinge member 54 having a size straddling the plurality of door parts 32 and the flange part 33 inside the opened molds 103 and 104 (setting step, FIG. 7);
A step of forming a plurality of extra length portions 52 on one hinge member 54 when clamping the molds 103 and 104 (excess length portion forming step, FIG. 8);
When or after the molds 103 and 104 have been clamped, a step of linearly weakening the portion between the plurality of door portions 32 of one hinge member 54 (weakening step, FIG. 9) is performed. It is assumed.

  Here, the setting step and the extra-length-portion forming step are the same as those in the first embodiment, and the description thereof will be omitted (if necessary, the description of the second embodiment will be made based on the description of the first embodiment. And).

  In the weakening process, when the mold clamping is completed, the portion between the plurality of door portions 32 is linearly weakened by being crushed by the weakening portion 121.

  Thereafter, an injection molding step of injecting the molten resin into the molding space 102 is performed, and a demolding step of releasing the air backgrid reinforcing member 31 from the molds 103 and 104 when the molten resin has hardened to a certain extent in the molding space 102. Done.

<About the air back grid reinforcement member 31>
As shown in FIG. 10, the airbag lid reinforcing member 31 manufactured by using the above-described manufacturing die apparatus 101 surrounds a plurality of doors 32 that can be opened and closed and the outer peripheries of the plurality of doors 32. The flange portion 33 is connected to each other by a hinge member 54 formed of a separate member and having an extra length 52.
As shown in FIG. 11, the hinge member 54 is exposed to the outside at a position between the plurality of door portions 32 in a connected state having a linear weak portion 126.

  Here, the hinge member 54 in which the position between the plurality of door portions 32 is linearly weakened is linearly weakened by the weakening portion 121 at the time of mold clamping. The exposed portion (exposed portion 115) is reliably broken at the weakened portion 121 at the time of opening, and is not broken except at the weakened portion 121, so that flying fragments are not generated.

  <Effects> According to this embodiment, the following effects can be obtained.

  One hinge member 54 is set inside the molds 103 and 104 so as to straddle the plurality of door portions 32 and the flange portion 33. Thus, the labor for setting the hinge member 54 inside the molds 103 and 104 can be reduced, and the hinge member 54 can be stably set at an accurate position, which is efficient and improves the quality.

  Also, one hinge member 54 is set inside the molds 103 and 104, and a plurality of extra length portions 52 are simultaneously formed on one hinge member 54 when the molds 103 and 104 are clamped. In order to form the extra length portion 52, the tension members F 1 to F 4 of the respective portions are acted on by the hinge members 54 inside the molds 103 and 104 so that the tension can be balanced. Since the shape of the member 54 is stabilized, and an inadvertent displacement of the hinge member 54 is suppressed, distortion of the hinge member 54 can be eliminated. Then, the insert length of the hinge member 54 with respect to the door portion 32 and the flange portion 33 can be stably secured so that the required length becomes the required length.

  More specifically, in the case of this embodiment, as shown in FIG. 3, the tension F1 and the tension F3 acting on the inside of each extra-length portion forming projection 105 are balanced, and each extra-length portion forming projection 105 is balanced. The tension F2 acting on the outside of the portion 105 is substantially equal to the tension F4.

  In this embodiment, one hinge member 54 is set inside the molds 103 and 104, and when or after the mold clamping of the molds 103 and 104 is completed, a plurality of hinge members 54 of one hinge member 54 are set. A portion between the door portions 32 is linearly weakened. As a result, one hinge member 54 is stably embedded at the intended position. Even in this case, when the airbag body 4 is deployed, the hinge member 54 is reliably broken at the weak portion 126, so that the door portion 32 is not hindered from being deployed.

  In addition, since the exposed portion 115 between the plurality of door portions 32 is linearly weakened in one hinge member 54, for example, as in the case where the entire exposed portion 115 is weakened. In addition, fragments are not generated at the weakened portion of the hinge member 54, and the fragments are not scattered in the vehicle.

  In addition, the same operation and effect as those of the mold device 101 for manufacturing the air back grid reinforcement member 31 can be obtained also in the air bag grid reinforcement member 31 and the manufacturing method of the air bag grid reinforcement member 31.

DESCRIPTION OF SYMBOLS 31 Air back grid reinforcement member 32 Door part 33 Flange part 52 Extra length part 54 Hinge member 101 Manufacturing die apparatus 102 Molding space 103 Die 104 Die 105 Excess part formation projection (excess part formation part)
106 Cutting part 115 Exposed part 116 Cutting part 121 Fragile part 126 Fragile part X Vehicle longitudinal direction Y Vehicle width direction Z Vertical direction

Claims (6)

A plurality of openable and closable door portions and a flange portion surrounding the outer periphery of the plurality of door portions are formed as separate members, and form an airbag lid reinforcing member connected by a hinge member having an extra length. In a mold apparatus for manufacturing an air back grid reinforcing member having a molding space for performing,
In the molding space, with respect to one hinge member set so as to straddle the plurality of door portions and the flange portion, the extra length is provided at a position between each door portion and the flange portion. A plurality of extra-length portion forming projections each forming a portion,
And a cutting section for cutting one hinge member into a plurality of sheets in accordance with the plurality of door sections by closing the mold. A plurality of openable and closable door portions and a flange portion surrounding the outer periphery of the plurality of door portions are formed as separate members, and form an airbag lid reinforcing member connected by a hinge member having an extra length. In a mold apparatus for manufacturing an air back grid reinforcing member having a molding space for performing,
In the molding space, with respect to one hinge member set so as to straddle the plurality of door portions and the flange portion, the extra length is provided at a position between each door portion and the flange portion. A plurality of extra-length portion forming projections each forming a portion,
A weakening portion that linearly weakens a portion between the plurality of door portions of the one hinge member by mold clamping of a mold, for manufacturing an airbag lid reinforcing member. Mold equipment. Manufactures an airbag lid reinforcing member in which a plurality of doors that can be opened and closed and a flange that surrounds the outer peripheries of the plurality of doors are connected by hinge members formed of separate members and having extra lengths. In the manufacturing method of the air back grid reinforcement member to be,
A step of setting one hinge member having a size straddling the plurality of door portions and the flange portion inside the opened mold;
A step of forming a plurality of extra length portions on one hinge member when clamping the mold;
A step of cutting one hinge member into a plurality of pieces in accordance with the plurality of door portions at or after completion of mold clamping of the mold. Manufactures an airbag lid reinforcing member in which a plurality of doors that can be opened and closed and a flange that surrounds the outer peripheries of the plurality of doors are connected by hinge members formed of separate members and having extra lengths. In the manufacturing method of the air back grid reinforcement member to be,
A step of setting one hinge member having a size straddling the plurality of door portions and the flange portion inside the opened mold;
A step of forming a plurality of extra length portions on one hinge member when clamping the mold;
Performing a step of linearly weakening a portion between the plurality of door portions of one of the hinge members at the time of or after completion of the mold clamping of the mold. Method. A plurality of openable and closable door portions, and a flange portion surrounding the outer periphery of the plurality of door portions, an airbag lid reinforcing member connected by a hinge member formed of a separate member and having an extra length portion,
The hinge member is exposed to the outside at a position between the plurality of door portions so as to be able to butt against each other. A plurality of openable and closable door portions, and a flange portion surrounding the outer periphery of the plurality of door portions, an airbag lid reinforcing member connected by a hinge member formed of a separate member and having an extra length portion,
The hinge member is exposed to the outside in a state where the hinge member has a linear weak portion and is connected to the outside at a position between the plurality of door portions.