JP4067355B2 - Automotive interior parts - Google Patents

Description

[0001]
【Technical field】
The present invention relates to an automobile interior product having a lid for popping out an airbag.
[0002]
Here, as automobile interior parts, in addition to an instrument panel (hereinafter referred to as “instrument panel”) which will be described as an example in the present specification, airbag modules such as side doors, pillars, front and back seats, etc. Can incorporate various automobile parts.
[0003]
[Background]
In a so-called hard instrument panel (general injection instrument panel) in which the instrument panel body is molded of a hard resin (for example, PPF), the bag lid that forms the airbag outlet of the passenger seat airbag device is conventionally separate from the instrument panel body. It was molded into. For this reason, a gap and a step are easily generated between the bag lid and the instrument panel body, which is limited in design and increases the number of assembling steps.
[0004]
Accordingly, an automobile interior part body (instrument panel body) in which a lid frame part that forms an opening for popping out an airbag and a lid part of a double door are integrally molded with a hard resin molding material together with the other part of the body, and the lid frame A hard instrument panel having a cover retainer 20 (soft resin coupling body) coupled across the back surface of the cover and the cover has been proposed (see Japanese Patent Application Laid-Open No. 2000-71936, FIGS. 4 and 5).
[0005]
The lid portion of the instrument panel, which is a hard resin molded body , needs to be broken when the airbag is activated, so that it is necessary to form a lid portion planned break line (tear line). And there exists a thing which has a thick part and a thin part alternately on the back side as an aspect of a planned fracture line (for example, refer to JP, 2001-5106, A).
[0006]
And in the instrument panel 12 provided with the front and rear lid portions 22 and 23 constituting the opening portion for the airbag jumping out as shown in FIG. 1, the pin holes 14 as shown in FIGS. Further, the lid retainer 20 is coupled to the back surface of the instrument panel main body 18 in which the planned fracture line 16 is simultaneously formed by molding at the time of injection molding, and an airbag module (not shown) is mounted via the lid retainer 20. About the thing, when the airbag was operated and the lid | cover part expansion | deployment test was done, the following thing was understood.
[0007]
The corner portion of the non-occupant side lid portion (front lid portion) 22 is broken to generate a corner fracture piece 24 (shaded portion in FIG. 2B).
[0008]
DISCLOSURE OF THE INVENTION
In view of the above, an object of the present invention is to provide an interior part for an automobile having an airbag lid part break line on the back side alternately having a thick wall portion and a thin wall portion. An object of the present invention is to provide an automobile interior product main body that does not generate broken pieces in a corner portion.
[0009]
The inventors of the present invention have estimated that the reason why the corner breakage fragments are generated when the airbag lid portion is deployed is as follows by analyzing the results of the deployment test.
[0010]
If the planned fracture line of this form is molded at the same time as the injection molding, the rear lid part (occupant side lid part) usually has a gate opening in the direction perpendicular to the rotational end fracture planned line, so that the thick part is sandwiched between them. A weld line (fusion line) w is generated on the rear side of the resin flow (white arrow) F, that is, in a direction orthogonal to the rotation end fracture line 16a.
[0011]
When the lid portion is developed, first, a fracture occurs from the central portion of the rotation end fracture planned line (center fracture planned line) 16a and breaks toward the side fracture planned lines 16b on both sides (hereinafter, “scheduled fracture”). Is propagated. Then, when the expected breakage propagates to the vicinity of the side edge of the lid-side connecting plate portion 20a of the lid retainer 20, the apparent strength of the front lid portion 22 is reduced, so that stress concentrates on the weld line w of the portion. An unscheduled break (crack) in the oblique direction (hereinafter referred to as “unscheduled break”) occurs starting from the weld line w. At this time, the unscheduled fracture in the oblique direction occurs because the propagation direction of the planned fracture when reaching the weld line is orthogonal to the direction of the weld line, so it is unscheduled around 45 ° between them. It is estimated that the fracture propagates.
[0012]
And since the propagation speed of unscheduled fracture requires energy more than planned fracture in which a discontinuous hole exists, it is slower than that of planned fracture. However, the distance until the unscheduled break reaches the planned side break line is shorter than the distance from the unscheduled break starting point of the planned break to the planned side break planned line arrival point. That is, the relationship between the hypotenuse of the opposite corner portion of the opposite corner portion (right triangle) and the sum of the two sides sandwiching the right angle is obtained.
[0013]
For this reason, as a result of the unscheduled rupture and the planned rupture schedule reaching simultaneously on the side rupture planned line 16b, it is presumed that a fracture piece (fragment) 24 of the opposite corner portion is generated.
[0014]
Based on the above estimation, the present inventors have come up with an automobile interior body having the following configuration.
[0015]
The vehicle interior trim body and a cover frame portion constituting the opening and casement lid is integrally injection molding with the body other portion for popping the airbag,
On the back side of the lid portion, a thickened portion and a thinned portion are alternately formed to form a planned fracture line. The planned fracture line is a rotation end fracture planned line (corresponding to a double-spreading line) and the rotation end fracture planned line. And a pair of side fracture planned lines extending substantially orthogonally from both ends of the configuration, in the configuration where the axis of the molding gate is substantially orthogonal to the rotational end fracture planned line,
One lid portion of the double door is widened, bulging step portions are formed at both ends of the planned rotation end breaking line, and the bulging step portion is an inclined portion or an R portion.
[0016]
By setting it as the said structure, propagation of the fracture | rupture from a rotation end fracture | rupture planned line to a side part planned fracture line does not bend abruptly, but becomes smooth. Therefore, a corner fracture piece does not occur with certainty that a scheduled fracture has priority over an unscheduled fracture.
[0017]
It is preferable that one of the lids be a lid closer to the passenger side. This is because the corner portion of the wide lid portion is formed of an inclined portion or an R portion and is edgeless.
[0018]
In the above-mentioned configuration, when the cover frame part and the cover part are used as an automobile interior product that is integrally injection-molded using the same hard resin molding material together with the other part of the main body, the planned fracture line is further on the side. The vehicle interior body has a lid-side coupling plate portion 66, a frame-side coupling plate portion 68, and a flexible member that couples the two to the rear surface side. The lid retainer 20 provided with a flexible curved hinge portion can be attached. The effect of the present invention becomes more remarkable because it is made of a hard resin in which stress is concentrated on the weld line and corner breakage is likely to occur. The reason for providing the hinge-side planned fracture line and enabling the lid retainer 20 to be attached to the back of the lid is to ensure the hinge characteristics of the deployment bag.
[0019]
In addition, when the lid retainer is configured to be attachable, the side break planned line of the lid portion that is not wide is arranged on the attachment leg portion forming portion of the frame side coupling plate portion 68. desirable. The mounting leg that is the fulcrum when an external force is applied to the planned side rupture line during normal use because the distance from the part where the side rupture planned line of the lid part to be wide can be relatively shortened. The distance from the portion forming portion is short, and the side portion planned fracture portion is unlikely to be bent.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an automobile interior body of the present invention will be described based on an example of an instrument panel as shown in FIG.
[0021]
Similarly to the above, the lid frame portion 26 and the double-speech lid portions (front and rear lid portions 22 and 23) are integrally molded together with the main body other portion 64 using the same hard resin molding material.
[0022]
Here, as the hard resin molding material, a material having a flexural modulus (ASTDM) of 1660 to 6000 MPa, preferably 1800 to 2660 MPa is used.
[0023]
For example, PPC (carbon filled polypropylene), PPT (talc filled polypropylene), PC (polycarbonate) / ABS (acrylonitrile-butadiene-styrene terpolymer), PC (polycarbonate), ASG (glass fiber-filled allyl), ABS ( And acrylonitrile / butadiene / styrene terpolymer) and PPE (polyphenylene ether). Among these hard resins, a fiber-reinforced crystalline polyolefin resin (for example, talc-filled polypropylene: PPT) can be used from the viewpoint of weight reduction.
[0024]
Further, on the back surface of the instrument panel main body 18 where the airbag module is mounted, a planned breaking line 16 is formed by alternately having thick and thin portions in order to partition the lid frame portion and the double-spread lid portions 22 and 23. The planned break line 16 includes a rotation end break planned line (corresponding to a double-spread line) 16a and a pair of side break planned lines 16b extending substantially orthogonally from both ends of the rotation end break planned line 16a. A gate axis line, that is, a material flow direction F is substantially perpendicular to the rotation end fracture line 16a, and further includes a pair of hinge side fracture lines 16c that connect both ends of the side part fracture line 16b. The reason why each planned fracture line 16 is formed from the back surface side and is not revealed on the front surface side is because of a design requirement (lid portion invisible).
[0025]
The form of the planned fracture line 16 (the tear line) is a perforation (dotted line (broken line) shape) in which a large number of conical round holes (pin holes 14) are continuously arranged at a predetermined pitch, as described above. (See FIG. 3).
[0026]
For example, specifically, the body thickness: 70 to 4 mm (preferably 1.5 to 5 mm), the hole diameter: 0.5 to 2 mm (preferably 1 to 1.6 mm), and the minimum wall thickness between the holes: 0.1 to 1 mm (Preferably 0.1 to 0.3 mm), hole remaining thickness: 0.1 to 0.8 (preferably 0.1 to 0.4 mm), tip apex angle: 60 to 120 ° (preferably 80 to 100 °).
[0027]
Here, the shape of the planned fracture line 16 (the tear line) may be formed by forming slits (long holes in the cross section) at a predetermined pitch, and in a mixture of round holes and slits, that is, in the form of a one-dot chain line or a two-dot chain line. In addition, as described in JP-A-2002-55106, a thick portion and a thin portion are alternately formed by forming discontinuous recesses at a predetermined pitch at the bottom of the main fracture groove. But you can.
[0028]
Then, one lid portion of the above-mentioned double doors, in the illustrated example, the occupant side lid portion (rear lid portion) 23 is widened, and bulging step portions 34 are formed at both ends of the rotation end breaking planned line 16a. The stepped portion 34 is an inclined portion or an R portion, and the molding gate is formed on the side of the lid portion (front lid portion) 22 that is not wide, so that the material flow F is forward (from the non-occupant lid portion 22). It is supposed to go to the rear (occupant lid 23). Moreover, the side part breakage line 16b of the front cover part (non-occupant side) 22 is arranged on the side wall part 59 formation site | part of the frame side coupling plate part 20b of the cover part retainer 20 (FIG. 4). To 6). Note that reinforcing ribs 56 and 57 are formed on the outer side of the base part of the side wall part 59, though not necessarily.
[0029]
Although the specifications of the bulging step portion 34 vary depending on the size of the lid portion, for example, the width (hinge length) w of the non-occupant side lid portion (front lid portion) 22 is about 200 mm, and the rotation end distance L is 66 mm. When front and back, the bulge amount is 2 to 10 mm, preferably 3 to 7 mm. The angle of the inclined portion (relative to the planned rotation end fracture line 16) is about 45 °, but can be changed in the range of 30 to 60 ° according to the bulging amount and the required inclined portion length. R is 3R-7R corresponding to the normal bulge amount.
[0030]
If the bulging amount of the bulging step 34 is too small, there is an effect of reducing the degree of deceleration (braking amount) of the propagation speed when the planned break moves from the planned rotation end break line 16a to the side break planned line 16b ′. small. On the other hand, if the bulging amount is too large, as described above, the distance of the wide side break planned line 16b ′ from the mounting leg portion forming portion of the lid retainer (auxiliary member) 20 described later increases, The amount of deflection at the part breakage planned line 16b 'increases.
[0031]
In addition, in order to heat-caulk-couple a lid retainer 20 (described later) to the back surface of the lid frame portion 26 and the lid portions 22 and 23 , respectively, Caulking ribs) 31A, 31B, and 31C are assembled in groups of 3 on the back surface of the front / rear lid portions 22 and 23, the back surfaces of both side frame portions, and the back surfaces of the front and rear outer frame portions 26 and 26, respectively. Four rows are formed, one row at a time. It should be noted that the back surfaces of the front and rear lid portions 22 and 23 may each be formed in multiple rows, for example, in two rows when a high bonding strength is required. The mold structure is simple, and the time for material flow into the heat caulking plate shaping groove is shortened, resulting in a short cycle time.
[0032]
At this time, in the case of the instrument panel 12 provided with the cover portions 22 and 23 having the wall thickness of the above specifications, the shape of the heat caulking plates 31A, 31B, and 31C is a trapezoid or a triangle, and in the illustrated example, a trapezoid or a right triangle. (See FIG. 7). This is to facilitate heat caulking. And when thickness is set to 0.1 to 0.25 mm, for example, when the trapezoidal heat caulking plate 31A is formed on the back surface of the lid, the original width: 60 to 40 mm, the height: 10 to 70 mm, the tip width: the original width 1/3 or less.
[0033]
Here, the planned fracture line 16 is formed in the following manner at the time of injection molding (mold molding) of the instrument panel body 18 (refer mainly to FIGS. 4, 5, and 6).
[0034]
A planned fracture line shaping block 36 as shown in FIG. 8 provided with a planned fracture line forming projection 38 corresponding to a planned fracture line (tea line) 16 that partitions the lid frame part 26 and the lid parts 22 and 23, 9A to 9B from the start of filling to the completion of filling of the molding material, that is, the fracture line forming projection 38 is protruded into the cavity C, and this state After the filling time (filling process or injection) is completed, the pressure is maintained until the pressure holding time (pressure holding process) is finished as described later. This is because if the planned fracture line forming protrusion 38 is not retracted until the curing time is completed, it may be difficult to release due to molding shrinkage. Then, a planned fracture line 16 formed by a dotted pin hole as shown in FIG. 4 is formed.
[0035]
In the present embodiment, the expected fracture line shaping block 36 is advanced immediately after the start of filling, but may be performed between the filling process time (injection time) immediately after the start of filling. If the shaping block 36 is advanced too early, defective material flow or shrinkage will easily occur, and if the molding block 36 is too late, material solidification (curing) of the mold cavity surface will start and it will break. A pressing pressure trace of the line forming protrusion 38 is likely to appear on the design surface.
[0036]
Here, even immediately after the start of filling of the material, the material has reached the midway position from the gate side of the fracture line forming protrusion 38 in the cavity C, and the material flow inhibition advances the shaping block 36 from before the start of injection. Smaller than the case where Further, the material is not completely filled before the filling time (filling step), that is, before the pressure holding step, and the shaping block 36 is advanced after the conventional filling time (before the pressure holding step). In contrast, the material is hardly cured.
[0037]
For this reason, even if the planned fracture line forming projection 38 is projected into the cavity C by the advancement of the shaping block 36, the smooth escape of the material at the projecting portion of the planned fracture line forming projection 38 can be ensured. Therefore, the pressing pressure mark of the projected portion for forming the fracture line 16 does not appear on the surface side.
[0038]
Here, the pressure holding time is the time during which the injection pressure is maintained after injection of the molding material (after the filling time is finished), and the backflow of the filling material in the mold is prevented and the filling in the mold is performed. The purpose is to apply sufficient pressure to the material.
[0039]
In order to cure the thermoplastic resin, for example, when the molding material is PPT, the temperature of the mold is usually adjusted to 40 to 60 ° C. by the water passages 40 and 40. For example, in the case of polypropylene (PP) which is a crystalline polymer, the lower the mold temperature, the lower the rigidity of the molded product, but the higher the impact resistance. For this reason, the mold temperature is appropriately set according to the characteristics required for the instrument panel body 14.
[0040]
Then, after forming the planned fracture line 16, that is, after completion of the pressure holding time, the planned fracture line shaping block 36 is retracted. And when hardening time is complete | finished, after performing mold opening, it releases.
[0041]
The injection mold 42 used here basically comprises a male mold (lower mold: movable mold) 44 and a female mold (upper mold: fixed mold) 46. The block 36 is embedded (attached) so as to be slidable via a hydraulic cylinder 48 or the like.
[0042]
As shown in FIG. 8, the planned fracture line forming projection 38 formed on the shaping block 36 is formed by arranging a large number of needle-like pins 38 a side by side.
[0043]
At this time, the tip of the needle pin 38a is tapered in cross section. This is because the escape of the material can be performed smoothly and uniformly, and the trace of the planned fracture line 16 is less likely to appear on the surface, and the tearability of the planned fracture line 16 is increased, contributing to the rapid deployment of the airbag.
[0044]
In the present embodiment, the lid-side coupling plate portion 20a, the frame-side coupling plate portion 20b, and the flexible front / rear curved hinge portion are provided on the back side of the airbag panel mounting portion of the instrument panel body 18 (automobile interior body). A lid retainer 20 including 20c and 20c can be attached. In this embodiment, the mounting manner of the lid retainer 20 is thermal caulking coupling, but the coupling plate portions 20a and 20b may be bonded to the entire back surfaces of the lid portions 22 and 23 and the lid frame portion 26. Good.
[0045]
The lid retainer 20 is formed of a soft resin molding material from the viewpoint of smoothing the hinge action of the front and rear curved hinge portions 20c, 20c and preventing the airbag from being damaged.
[0046]
The soft resin has a bending rigidity of less than 1660 MPa (desirably 1000 MPa) and a tensile strength of 8 MPa (desirably 10 MPa).
[0047]
Similarly to the above, from the viewpoint of weight reduction, non-polar thermoplastic elastomers such as olefin (TPO), 1,2-PB (RB), styrene (TPS) and the like can be suitably used. Polar thermoplastic elastomers such as polyester (TPEE), amide (TPA) and urethane (TPU) can also be used.
[0048]
The lid side coupling plate portion 66 and the frame side coupling plate portion 68 are formed with crimping plate insertion holes 27A, 27B, 27C corresponding to the thermal crimping plates 31A, 31B, 31C, respectively.
[0049]
Then, the lid retainer 20 is caulked and joined to the airbag mounting portion of the instrument panel body 18. That is, after inserting the thermal caulking plates 31A, 31B, 31C of the coupling plate portions 38, 38 protruding from the lid portions 22, 23 and the lid frame portion 26 of the instrument panel body 18 into the caulking plate insertion holes 27A, 27B, 27C, Press with a hot plate or the like to heat.
[0050]
Further, the front / rear mounting wall portions 58 and 60 and the side wall portion 59 connecting them may be formed in two colors with different materials even if they are not part of the lid retainer 20, or the instrument panel main body 18 (hard resin main body in a divided state). ).
[0051]
The instrument panel 12 is used by assembling an airbag module 62 and mounting it on an actual vehicle.
[0052]
The airbag module 62 basically includes a bag main body 64, a vertical cylindrical inflator 66 that allows inflation gas to flow into the bag main body 64, and a bag case 68 that integrates these members. The inflator 66 and the bag main body 64 are integrated with the bag case 68 by fastening the bottom side step 68c together with the flange 66a of the inflator 66 and the bag retainer 69. Reference numeral 67 denotes a lock plate.
[0053]
The front and rear mounting walls 58 and 60 of the lid retainer 20 are inserted and engaged with the front and rear walls 68a and 68b of the bag case 68 to form an airbag assembly, which is attached to the vehicle body (actual vehicle) via a bracket (not shown). To do.
[0054]
When an impact load of a predetermined value or more is applied to the vehicle body, the planned fracture line 16 that divides the lid frame portion 26 and the lid portions 22 and 23 breaks as described below, and the lid portions 22 and 23 become the lid portion retainer 20. The air bag pop-out opening 70 is formed and the air bag (bag body 64) is rapidly inflated and deployed.
[0055]
First, the bag body 64 is pressed to press the instrument panel body 14 from the back side (lower surface). After the stress concentrates on the central portion of the pivot end break planned line 16a in the instrument panel main body 14 and breaks, the break propagates to the left and right, spreads to the side break planned lines 16b and 16b ', and the lid portions 22 and 23 are formed. Try to rotate. As the lid portions 22 and 23 rotate in the opening direction, stress concentrates and breaks on the hinge portion breaking planned line 16c, and the lid portions 22 and 23 are held by the lid portion retainer 20 while being separated from the instrument panel main body 14. As a result, the air bag opening 70 is formed.
[0056]
At this time, the rotation end break planned line 16a and the wide side part break planned line 16b 'are continuous at the bulging step portion 34 formed by the inclined portion or the R portion, and therefore the rotation end break planned The degree of deceleration (braking amount) of the propagation speed at the time of moving from the line 16a to the wide side breaking planned line 16b 'is small, and the propagation speed of the planned breaking is not reduced. Therefore, even if an unscheduled break occurs in the direction of the planned side break line 16b ′ that is widened starting from the weld line w, the planned break at the planned side break line 16b ′ takes precedence. Therefore, no corner breakage fragment occurs. Naturally, since there is no weld line w on the side portion planned breaking line 16b side which is not widened, no unscheduled breaking occurs toward that side.
[0057]
Then, the curved hinge portion 54 of the lid retainer 20 expands forward and backward so as to embrace the edge of the airbag outlet 70 of the instrument panel body 14 formed by the separation of the lid portions 22 and 23 (see FIG. 7). ). And an airbag (bag main body 64) jumps out from the airbag pop-out port 70 and protects an occupant.
[0058]
In this embodiment, the lid frame 26 and the lid are integrally injection-molded using the same hard resin molding material together with the other parts of the main body, and the hard instrument panel to be assembled with the airbag module via the lid retainer 20 is provided. For example, the lid frame 26 and the lid are made of a resin molding material having lower rigidity than the other parts of the main body, are two-color injection molding, do not use the lid retainer 20, and further, have a two-layer configuration. The present invention can also be applied to an automobile interior body having a configuration in which the planned fracture line 16 is formed by discontinuous through holes.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an instrument panel which is an example to which an automobile interior body of the present invention is applied. FIG. 2 is a plan view showing an example of a conventional planned fracture line formed on the back surface of an instrument panel body on which an airbag is mounted. FIG. 3 is an enlarged cross-sectional view taken along a line 3-3 in FIG. 2. FIG. 4 is a plan view showing an example of a planned fracture line formed on the back surface of the instrument panel body on which an airbag is mounted; FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a rear sectional view showing one embodiment of a lid retainer. FIG. 7 uses the instrument panel body in one embodiment of the present invention. FIG. 8 is a perspective view showing an example of a fractured line shaping block used in the manufacturing method of the present invention. FIG. 9 is an injection molding gold used in manufacturing the instrument panel body of the present invention. Cross section of model Akira]
12 Instrument panel (instrument panel)
16 Scheduled fracture line 16a Rotation end fracture schedule line 16b Side fracture schedule line 16b 'Widened fracture schedule line 16c Hinge side fracture schedule line 18 Instrument panel body (automobile interior body)
20 Lid retainer 22 Non-occupant side lid (front lid)
26 Lid Frame 23 Passenger Side Lid (Rear Lid)
32 Main body other part 34 Swelling step part 20a Lid side retainer cover plate 20b Lid frame retainer plate F Lid material flow at injection molding

Claims (4)

A car interior part main body in which a lid frame part that constitutes an opening part for air bag jumping out and a lid part of a double door is integrally injection molded together with the other part of the main body,
A planned fracture line for partitioning the lid frame portion and the lid portion is alternately formed by molding at the time of the integral injection molding , having alternately thick and thin portions on the back side of the automobile interior body. ,
The planned break line includes a rotation end break planned line (corresponding to a double spread line) and a pair of side break planned lines extending substantially orthogonally from both ends of the rotation end break planned line, and the axis of the molding gate is In the configuration substantially orthogonal to the rotation end fracture line,
The lid portion on the passenger side of the double door is widened, bulging step portions are formed at both ends of the planned rotation end breaking line, the bulging step portion is an inclined portion or an R portion, and the molding gate Is formed on the non-occupant side lid side. The lid frame part and the lid part are interior parts for an automobile that are integrally injection-molded using the same hard resin molding material together with the other part of the main body, wherein the planned break line is further at both ends of the planned side break line A lid having a pair of hinge-side fracture lines connecting the two, and a lid-side coupling plate portion, a frame-side coupling plate portion, and a flexible curved hinge portion on the back side of the airbag mounting portion of the automobile interior body The automobile interior body according to claim 1 , wherein a part retainer is attachable. 3. The interior of an automobile according to claim 2 , wherein the planned side breakage line of the lid portion that is not wide is arranged on a mounting leg portion forming portion of the frame side coupling plate portion of the lid retainer. Product body. A method of manufacturing an automobile interior body that integrally injection-molds a lid frame portion that forms an opening for air bag jumping out and a lid portion of a double door together with the other body portion,
Pair for partitioning the lid frame section and the lid section, the axis substantially perpendicular rotational end tearable lines of mold gate (corresponding to the double doors alignment line), extending substantially perpendicular from opposite ends of the rotary end breakable line In the method of forming the side portion planned break line of the automobile interior product main body on the back surface side alternately with thick portions and thin portions at the time of injection molding,
The interior part of the automobile interior has a wide lid on the passenger side of the double-sided opening, bulging step portions are formed at both ends of the planned rotation end breaking line, and the bulging step portion is an inclined portion or an R portion. Furthermore, the automobile interior part manufacturing method is characterized by performing injection molding so that the molding gate is formed on the non-occupant side lid part side.

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