JP2008132597A - Vehicle interior panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle interior panel wherein first and second core materials are connected at the same time and the connection part of them is sealed without increasing the number of parts. <P>SOLUTION: A first projection part 50 is protruded from the back peripheral edge part 22 of the opening part 21 of a first core material 20 corresponding to the outside part of the latticed rib 33 for facilitating welding and closely welded to a flange part 31 when the back peripheral edge part 22 and the flange part 31 are welded. Since the outside part of the latticed-like rib 33 is closed by the first projection part 50, the outflow of the molten material of a skin material 40 is prevented to dispense with the excessive number of work processes or parts. Further, the outflow of welding burr 90 to the gap (S) between the first and second core materials 20 and 30 or the surfaces of the first and second core materials 20 and 30 is prevented to prevent the variation of the injection amount of the molten material of the skin material 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle interior panel in which a skin material is injection-molded on the surfaces of two core members that are overlapped and joined to each other, and a method for manufacturing the vehicle interior panel.

  When an air bag is provided in a passenger seat of an automobile, the airbag is installed in a portion of the instrument panel facing the passenger seat.

  The instrument panel is a vehicle interior panel and is generally formed by injecting and foaming a foamed resin material between the surface of the first core material (panel body base material) made of synthetic resin and the skin material. At the installation site of the passenger seat airbag, an opening is formed in the first core member, and a second core member (door base material) containing the airbag is connected to the opening, The foamed resin material as the skin material is injected and molded on the surfaces of the first core material and the second core material (see, for example, Patent Document 1).

At this time, the connection between the first core member and the second core member is a method in which a locking claw provided on the peripheral portion of the second core member is locked to the peripheral portion of the opening of the first core member. Has been taken.
JP 2002-187516 A (page 3, FIG. 1)

  However, in such a conventional instrument panel, the first core material and the second core material are connected by locking the locking claw to the periphery of the opening as described above. When the material is injected, the molten material or liquid resin material leaks at the connecting part of both core materials, and the amount of leakage is not constant, so it becomes difficult to control the supply of the molten material or liquid resin material, and the skin material of that part The non-uniform layer thickness reduces the commercial value of the instrument panel.

  For this reason, in the said patent document 1, a sealing tape is stuck across the said connection part, ie, the opening part periphery of a 1st core material, and the outer periphery of a 2nd core material, and the molten material of a foaming layer is used. It is designed to prevent leakage.

  However, since the sticking of the seal tape is performed manually by an operator, the number of work steps is increased, and the increase in the number of parts due to the seal tape increases the manufacturing cost of the instrument panel.

  Therefore, the present invention provides a vehicle interior panel and a vehicle interior panel capable of sealing the connection portion at the same time as connecting the first core material and the second core material and without increasing the number of parts. It aims at obtaining the manufacturing method of this.

  In invention of Claim 1, it is a vehicle interior panel which coat | covered the surface of the 1st core material and 2nd core material which were mutually connected by the skin material by injection molding, Comprising: Said 1st core material and The second core member is provided with a joint portion that is overlapped and welded to be integrated with each other, and at least one of the first core member and the second core member is disposed outside the weld portion. The first protrusion is provided so as to protrude in correspondence with the portion, and is in close contact with the mating joint when both joints are welded.

  In the invention of claim 2, the core member having the joint portion on the side from which the skin material is injected among the joint portions to be overlapped with each other, the side on which the first protrusion of the mating joint portion is provided. A second protrusion is provided in contact with the end surface on the opposite side.

  In the invention of claim 3, the first core material is a core material body of the entire instrument panel, and the second core material is overlapped with the peripheral edge of the back surface of the opening formed in the first core material. And a storage part that folds and stores the airbag, and welds the peripheral edge part of the opening and the flange part as a joining part, and the cover material of the storage part of the airbag The side is closed by a door portion whose peripheral portion is surrounded by the flange portion, and a breakage portion is provided in the door portion that is broken by the pressure when the airbag is inflated, and between the door portion and the flange portion. The hinge part which opens a door part at the time of the fracture | rupture of the said fracture | rupture part was provided.

  In the invention of claim 4, lattice-shaped ribs that facilitate melting at the time of welding are provided in at least one welded portion of the joint portion of the first core member or the joint portion of the second core member. It is characterized by that.

  The invention according to claim 5 is characterized in that the skin material is a urethane resin.

  The invention according to claim 6 is a method for manufacturing a vehicle interior panel in which the surfaces of the first core member and the second core member connected to each other are covered with a skin material by injection molding. A joining portion is provided in which the core material and the second core material are overlapped and welded to be integrated with each other, and each joining portion protrudes from at least one of the joining portions corresponding to the outer portion of the welding portion. The overlapping step of interposing the first protrusions with each other, and the overlapped first core member joining portion and second core member joining portion between the first projecting portion and the mating portion on the other side. A welding step of welding while adhering to the joint portion, and a first core material and a second core material welded to each joint portion are set in a mold for injection molding of the skin material, and the first core For injecting molten material of skin material onto the surface of the core material and the second core material Characterized by comprising a and.

  In the invention of claim 7, the core member having the joint portion on the side from which the skin material is injected among the joint portions to be overlapped with each other, the side on which the first protrusion of the mating joint portion is provided. A second protrusion is provided in contact with the end surface on the opposite side.

  In the invention according to claim 8, at least one of the welded portion of the first core member and the joined portion of the second core member is provided with grid-like ribs that facilitate melting at the time of welding. It is characterized by that.

  According to the first aspect of the present invention, the first core member and the second core member are welded with the joint portions provided on each other being overlapped and welded to each other. The joint strength of the material can be increased, and the outer portion of the welded portion is blocked by the first protrusion between the joint portions of the two materials. Can be prevented from leaking out.

  At this time, the first protrusion for preventing leakage of the molten material protrudes from one joining portion, and at the same time when the joining portion is welded, it can be in close contact with the joining portion on the other side so that the space between both joining portions can be closed. This eliminates the need for extra work steps and parts, thereby reducing the manufacturing cost.

  In addition, the first protrusion prevents the melted portion generated when the two joint portions are welded from flowing out between the joint portions and the surfaces of the first core material and the second core material. Thus, it is possible to prevent the injection amount of the melt material of the skin material from fluctuating.

  According to the invention of claim 2, in addition to the invention of claim 1, the second protrusion provided on the core member having the joint portion on the side from which the skin material is injected when both joint portions are overlapped. Since the portion abuts the end surface of the mating joint opposite to the side on which the first protrusion is provided, the melted portion generated when both the joints are welded is joined to the mating joint. It is possible to prevent the part from flowing out from the end opposite to the side on which the first protrusion is provided, and to position both of them when the two protrusions are overlapped by the second protrusion. .

  According to the invention of claim 3, in addition to the effects of claims 1 and 2, the peripheral portion of the opening formed in the first core member and the flange portion of the second core member are joined portions. When the airbag housed in the housing portion of the second core member is inflated, the door portion is broken from the broken portion and opened by bending of the hinge portion, whereby the airbag is deployed.

  At this time, since the peripheral portion of the door portion is surrounded by the flange portion, the rigidity of the peripheral portion of the door portion is increased and the support rigidity of the door portion is increased, thereby breaking the load when the airbag is inflated. The door part can be smoothly opened by concentrating on the part.

  According to invention of Claim 4, in addition to the effect of Claims 1-3, when welding both junction parts, the lattice-like rib provided in at least any one welding part of these junction parts is easy. It is melted, so that the welded portion can be easily and reliably welded.

  According to the invention of claim 5, in addition to the effects of claims 1 to 4, since the skin material is made of urethane resin, the surface of the vehicle interior panel can have elasticity and feel can be improved. The product value can be increased.

  According to the invention of claim 6, when the joining portion of the first core material and the joining portion of the second core material are superposed in the overlapping step, the outer portions of the welded portions of the joint portions correspond to each other. When the first protrusion is interposed and both joint portions are welded in the next welding step, the first protrusion is brought into close contact with the mating joint portion. Therefore, when the molten material of the skin material is injected onto the surfaces of the first core material and the second core material in the injection process, both the joint portions are blocked by the first protrusion, so that the skin The molten material can be prevented from leaking between the joints of both parts, and the clogging between both joints is performed simultaneously with the welding of both joints in the welding process, eliminating the need for extra work steps and parts. As a result, the manufacturing cost can be reduced.

  In addition, the first protrusion prevents the melted portion generated when the two joint portions are welded from flowing out between the joint portions and the surfaces of the first core material and the second core material. Thus, it is possible to prevent the injection amount of the melt material of the skin material from fluctuating.

  According to the invention of claim 7, in addition to the invention of claim 6, the second protrusion provided on the core member having the joint portion on the side from which the skin material is injected when both joint portions are overlapped. Since the portion abuts the end surface of the mating joint opposite to the side on which the first protrusion is provided, the melted portion generated when both the joints are welded is joined to the mating joint. It is possible to prevent the part from flowing out from the end opposite to the side on which the first protrusion is provided, and to position both of them when the two protrusions are overlapped by the second protrusion. .

  According to the eighth aspect of the invention, in addition to the effects of the sixth and seventh aspects, when welding both joint portions, the lattice-like ribs provided on at least one of the joint portions are easily provided. It is melted, so that the welded portion can be easily and reliably welded.

  For injection molding, the thermoplastic resin is heated and melted and injected into a cooled mold, or the thermosetting resin is heated and kneaded and injected into a high-temperature mold using a plunger type injection device. In addition to the injection molding method, a liquid material with a foaming agent added to the resin mixture as needed is injected into the mold to cause a chemical reaction in the mold cavity to form a resin layer such as urethane or epoxy The reaction molding method (RIM method) shall be included.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  1 is a cross-sectional view of a main part of a vehicle interior panel according to the present embodiment, FIG. 2 is a front perspective view of a second core member, and FIG. 3 is a first core member and a second core member. FIG. 4 is a cross-sectional view showing a superposition process in which the welding jig is set on the welding jig, and FIG. 4 shows the welding process of the first core material and the second core material by the welding jig in order (a) and (b). FIG. 5 is an enlarged cross-sectional view showing a part A in FIG. 4A and a part B in FIG. 4B in FIG. 4B, and FIG. FIG. 7 is a cross-sectional view showing a state in which the core material and the second core material are removed from the welding jig, and FIG. 7 shows the first mold frame and the second mold frame that have been welded as injection molds. FIG. 8 is an enlarged cross-sectional view of a portion C in FIG. 7 showing the injection state of the molten material of the skin material in order from (a) to (b).

  In addition, in this embodiment, the instrument panel of a motor vehicle, especially the instrument panel of the part which stores the passenger side airbag is illustrated as a vehicle interior panel.

  That is, as shown in FIG. 1, an instrument panel 10 as a vehicle interior panel according to this embodiment includes a first core member 20 that is a core member body of the entire instrument panel 10, and an airbag that is not illustrated. Are formed by injection molding the skin material 40 on the surfaces of the first core material 20 and the second core material 30.

  In the first core member 20, a rectangular opening 21 is formed in the airbag mounting portion, while in the second core member 30, a flange portion that is overlapped with the rear peripheral edge 22 of the opening 21. 31 and the storage part 32 which folds and accommodates an airbag are provided, and the back surface peripheral part 22 and the flange part 31 are each a junction part.

  And while making the surface side of the 2nd core material 30 face the opening part 21, the flange part 31 is piled up on the back surface peripheral part 22, and it welds and integrates, The 1st core material 20 and the integrated 1st core material 20 are integrated. The skin material 40 is injection molded on the surface of the second core material 30.

  On the surface of the flange portion 31, that is, on the surface overlapped with the rear surface peripheral edge portion 22 of the opening portion 21, lattice-like ribs 33 serving as welded portions are projected as shown in FIG. By applying high-frequency vibration in a state where the back surface peripheral portion 22 is pressed, the contact surface between the grid-like rib 33 and the back-side peripheral portion 22 is easily melted and vibrated on the grid-like rib 33 side. It has become.

  The first core material 20 is molded using a hard polypropylene resin to which an additive such as talc (talc) is added as a raw material, and the second core material 30 is an elastomer, for example, a TPO (thermoplastic olefin) resin. A material obtained by forming a mold using a soft resin such as a resin is used.

  In this embodiment, urethane resin is used for the skin material 40. As the urethane resin, thermoplastic urethane (TPU) can be used for injection molding, but when using the RIM method, a mixture of isocyanate, polyol, and appropriate pigments and light-proofing agents is injected into the mold injection port. Mixing is performed with a mixing head provided immediately before the position. As the skin material 40, other flexible resins such as soft vinyl chloride and thermoplastic olefin (TPO) can be used.

  Here, in this embodiment, as shown in FIG. 1, the outer portion of the grid-like rib 33 serving as a welded portion is formed on the back surface peripheral portion 22 of the opening 21 serving as the joint portion of the first core member 20. In the embodiment, the first protrusion 50 is protruded corresponding to the inner peripheral portion of the flange portion 31, and the first protrusion 50 is joined to the mating portion on the opposite side when the back surface peripheral edge portion 22 and the flange portion 31 are welded, That is, the flange portion 31 is brought into close contact.

  That is, the 1st projection part 50 is formed by making the inner peripheral part of the opening part 21 protrude below, and the front-end | tip part (lower end part) is sharpened and formed in acute angle shape.

  Moreover, the 2nd projection part 60 is provided in the 1st core material 20 which has the back surface peripheral part 22 in the side where the skin material 40 is inject | emitted among the back surface peripheral part 22 and the flange part 31 which mutually overlap, this back surface part 22, The second projecting portion 60 is brought into contact with the opposite side of the flange portion 31 on the opposite side from the side on which the first projecting portion 50 is provided, that is, the outer peripheral end surface of the flange portion 31.

  As shown in FIG. 2, the second core member 30 is configured such that the central portion facing the opening portion 21, that is, the side where the skin material 40 of the airbag storage portion 32 is provided is closed by the door portion 34. The peripheral portion of the door portion 34 is surrounded by the flange portion 31.

  The door portion 34 is provided with a breaking portion 35 that breaks due to the pressure when the airbag is inflated, and a hinge portion 36 that opens the door portion 34 between the door portion 34 and the flange portion 31 when the breaking portion 35 breaks. Is provided.

  The door portion 34 has a rectangular shape along the shape of the opening portion 21, and the fracture portion 35 has a central groove 35 a extending in the long side direction at the central portion in the short side direction of the door portion 34, and the central groove. Both ends of 35a are formed in a substantially I-shape as a whole by side concave grooves 35b extending in the short side direction. Moreover, the hinge part 36 is formed of the concave groove 36a along the long side direction so as to connect both opposite end parts of the side concave grooves 35b at both ends.

  As shown in FIG. 1, the central groove 35 a and the side groove 35 b of the breaking portion 35 are formed by recessing the back surface of the door portion 34 in a V shape, and the groove 36 a of the hinge portion 36 is also formed. Similarly, the back surface of the door portion 34 is formed in a V-shape so as to be recessed. However, the cut depth of the cut portion 35 is larger than that of the hinge portion 36, and the break portion 35 is inflated by the airbag. The hinge part 36 is bent while being broken by force.

  The instrument panel 10 is manufactured by the method described below. After the first core member 20 and the second core member 30 are welded to each other using the welding jig 70 shown in FIG. The skin material 40 is injection-molded on the surfaces of the first core material 20 and the second core material 30 using an injection mold 80 shown in FIG.

  The welding jig 70 includes a lower die 71 and an upper die 72, and the first core material 20 and the second core material 30 are sandwiched between the lower die 71 and the upper die 72, and the lower die 71. High frequency vibration is generated between the upper die 72 and the upper die 72.

  The injection molding die 80 includes a lower die 81 and an upper die 82, and the first core material 20 and the second core are provided in a core material storage space 83 provided between the lower die 81 and the upper die 82. The material 30 is set and the molten material of the skin material 40 is injected into the cavity 83a provided on the surface side of the first core material 20 and the second core material 30.

  That is, as shown in FIG. 3, the method of manufacturing the instrument panel 10 sets the first core material 20 and the second core material 30 on the lower mold 71 of the welding jig 70, An overlapping step of overlapping the flange portion 31 with each other with the first protrusion 50 interposed therebetween, and as shown in FIGS. 4A and 4B, the overlapped back surface peripheral portion 22 and the flange portion 31 are combined. The welding process in which the first protrusion 50 projecting from the rear peripheral edge 22 is welded while adhering to the other flange 31, and the rear peripheral 22 and the flange 31 are welded as shown in FIG. Injection in which the first core material 20 and the second core material 30 are set in an injection mold 80 and the molten material of the skin material 40 is injected onto the surfaces of the first core material 20 and the second core material 30. And a process.

  In the superimposing step, the first core material 20 and the second core material 30 are set on the lower mold 71 of the welding jig 70, but the second core material 30 is disposed on the lower mold 71. A recess 73 for fitting the storage portion 32 is formed. By fitting the storage portion 32 in the recess 73, the second core member 30, and thus the first core member 20 can be fixed. Yes.

  At this time, the second protrusion 60 projecting from the back surface of the first core member 20 is brought into contact with the outer peripheral end of the flange portion 31.

  And in a welding process, as shown to Fig.4 (a), the lower mold | type 71 and the upper mold | type 72 are made to adjoin, and the 1st core material 20 and the 2nd core material 30 are a pressurization state between them. Next, as shown in FIG. 4B, high frequency vibration is applied to the lower mold 71 and the upper mold 72, so that the lattice ribs 33 are mainly melted to melt the back surface peripheral portion 22 and the flange portion 31. And are welded.

  At this time, in the sandwiched state of FIG. 4 (a), as shown in FIG. 5 (a), the lattice-like ribs 33 are pressed against the back surface peripheral portion 22, and at the same time, the tip of the first protrusion 50 is a flange portion. As shown in FIG. 5 (b), a slight gap is provided between them and a state in which a slight gap is provided between them or a slight contact with them, and as shown in FIG. Thus, the tip end portion of the first protrusion 50 bites into and adheres to the surface of the flange portion 31 while being melted.

  Then, when the welding between the rear surface peripheral edge portion 22 and the flange portion 31 is completed, as shown in FIG. 6, the lower die 71 and the upper die 72 are separated, and the first core member 20 and the second core member 20 which are welded to each other are separated. The core material 30 is removed from the welding jig 70.

  Next, the first core material 20 and the second core material 30 welded to each other in the welding process are set in an injection mold 80 as shown in FIG. The molten material of the skin material 40 is injected onto the surface of the second core material 30.

  In this injection molding process, the first core member 20 and the second core member 30 are set upside down with respect to the welding step. A recess 84 for fitting the storage portion 32 is formed. The storage portion 32 is press-fitted into the recess 84, and one side portion of the first core member 20 is sandwiched between the lower die 81 and the upper die 82. The integrated first core member 20 and second core member 30 are held in the core member storage space 83.

  It is particularly convenient when the RIM method is used to dispose the surface below the core materials 20 and 30 and inject the molten material between the core material 20 and 30. That is, when the core material is placed in a mold with the surface facing down and the resin mixed solution is introduced thereunder, even if there are bubbles entrained in the liquid resin mixed solution, it is located on the upper core material side. This is because it has a tendency to prevent appearance defects from appearing on the surface.

  Therefore, when the first core member 20 and the second core member 30 are set in the core member storage space 83, the surfaces of the first core member 20 and the second core member 30 are arranged on the lower side. The molten material is injected into the cavity 83a between the surface and the lower mold 81, and the mold is removed when the injected molten material is cured.

  By the way, when the molten material of the skin material 40 is injected into the cavity 83a, the inner periphery of the opening 21 of the first core member 20 and the door portion 34 of the second core member 30 are shown in FIG. A gap S is formed between the molten material and the outer periphery of the molten material. As shown in FIG. 8B, when the molten material is injected, the molten material enters and fills the gap S.

  According to the instrument panel 10 and the method for manufacturing the instrument panel 10 according to the present embodiment, when connecting the first core member 20 and the second core member 30, the back surface of the first core member 20. By connecting the peripheral edge portion 22 and the flange portion 31 of the second core member 30 so as to overlap each other, the connection strength between the first core member 20 and the second core member 30 can be increased.

  Further, as shown in FIG. 8A, the gap S between the rear surface peripheral edge portion 22 and the flange portion 31 is closed by the first protrusion 50 at the outer portion of the grid-like rib 33 that becomes a welded portion. Therefore, when the skin material 40 is injection-molded, it is possible to prevent the molten material from leaking between the back surface peripheral edge portion 22 and the flange portion 31.

  That is, when the back surface peripheral edge portion 22 of the first core member 20 and the flange portion 31 of the second core member 30 are overlapped in the overlapping step, the first portion corresponding to the outer portion of the lattice ribs 33 is provided. When the protrusions 50 are interposed and the lattice ribs 33 and the back surface peripheral edge 22 are welded in the next welding step, the first protrusions 50 are brought into close contact with the flange portion 31, and the first core material is injected in the injection step. When the molten material of the skin material 40 is injected onto the surfaces of the 20 and the second core material 30, both the joint portions are blocked by the first protrusions 50. It is possible to prevent leakage from between the joint portions.

  At this time, the first protrusion 50 that prevents the leakage of the molten material protrudes from the one peripheral edge 22 of the back surface, and is in close contact with the flange 31 on the other side at the time of welding the grid-like ribs 33, Since the gap can be closed, an extra work man-hour and parts are unnecessary, and the manufacturing cost can be reduced.

  Moreover, when the 1st projection part 50 obstruct | occluded between the back surface peripheral part 22 and the flange part 31, as shown in FIG.5 (b), when the grid-like rib 33 and the back surface peripheral part 22 were welded. The melted portion (welding burr 90) generated at the bottom is prevented from flowing out to the gap S and the surfaces of the first core member 20 and the second core member 30, It is possible to prevent the injection amount of the molten material from fluctuating.

  Moreover, in this embodiment, since the 2nd projection part 60 contact | abutted to the outer peripheral end surface of the flange part 31 was provided in the 1st core material 20, it generate | occur | produces when the back surface peripheral part 22 and the flange part 31 are welded. The welding burr 90 can be prevented from flowing out from the outer peripheral portion of the flange portion 31, and both can be positioned when the second peripheral portion 22 and the flange portion 31 are overlapped by the second protrusion 60.

  Further, the second core member 30 closes the skin member 40 side of the airbag storage portion 32 with a door portion 34 whose peripheral portion is surrounded by the flange portion 31, and the door portion 34 is inflated when the airbag is inflated. Since the breaking portion 35 that breaks due to pressure is provided and the hinge portion 36 that opens the door portion 34 when the breaking portion 35 is broken is provided between the door portion 34 and the flange portion 31, the door portion when the airbag is inflated. 34 is broken from the breaking portion 35 and opened by bending of the hinge portion 36, whereby the airbag is deployed.

  At this time, since the peripheral portion of the door portion 34 is surrounded by the flange portion 31, the rigidity of the peripheral portion of the door portion 34 is increased and the support rigidity of the door portion 34 is increased. Can be concentrated on the breaking portion 35 and the door portion 34 can be smoothly opened.

  Furthermore, since the grid-like ribs 33 are provided at the joint portions of the flange portion 31, the grid-like ribs 33 are easily melted during vibration welding, and the joint portions can be welded easily and reliably.

  Moreover, since the skin material 40 is made of urethane resin, the surface of the instrument panel 10 has elasticity and can be improved in touch, and its commercial value can be increased.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made. For example, the first protrusion 50 can be provided on at least one of the first core member 20 and the second core member 30 without being provided only on the first core member 20, and the grid-like ribs 33. May be provided on the rear peripheral edge 22.

The principal part sectional view of the interior panel for vehicles concerning one embodiment of the present invention. The surface perspective view of the 2nd core material concerning one Embodiment of this invention. Sectional drawing which shows the superimposition process which set the 1st core material and 2nd core material concerning one Embodiment of this invention to the welding jig | tool. Sectional drawing which shows the welding process of the 1st core material and 2nd core material by the welding jig concerning one Embodiment of this invention later on to (a), (b). 4A is an enlarged cross-sectional view showing a portion A in FIG. 4A and a portion B in FIG. 4B, respectively. Sectional drawing which shows the state which demolds the 1st core material and 2nd core material which completed the welding concerning one Embodiment of this invention from a welding jig | tool. Sectional drawing which shows the injection | emission process which set the 1st mold frame and the 2nd mold frame which completed the welding concerning one Embodiment of this invention to the injection mold. The expanded sectional view of the C section in Drawing 7 which shows the injection state of the melting material of the skin material concerning one embodiment of the present invention in order to (a) and (b).

Explanation of symbols

10 Instrument panel (vehicle interior panel)
20 1st core material 21 Opening part 22 Back surface peripheral part (joining part)
30 Second core 31 Flange (joint part)
32 Storage portion 33 Grid-shaped rib 34 Door portion 35 Breaking portion 36 Hinge portion 40 Skin material 50 First projection portion 60 Second projection portion 70 Welding jig 80 Injection mold

Claims (8)

A vehicle interior panel in which the surfaces of the first core material and the second core material connected to each other are covered with a skin material by injection molding,
The first core member and the second core member are provided with a joint portion that is overlapped and welded to be integrated with each other, and at least one joint portion of the first core member or the second core member is provided. Further, the vehicle interior panel is provided with a first protrusion that protrudes corresponding to the outer portion of the welded portion and adheres closely to the mating joint portion when both the joint portions are welded.   The core member having the joint portion on the side from which the skin material is injected out of the joint portions to be overlapped with each other is in contact with the end surface of the mating joint portion on the opposite side to the side on which the first protrusion is provided. The vehicle interior panel according to claim 1, wherein two protrusions are provided.   The first core material is a core material body of the entire instrument panel, and the second core material is formed by folding the flange portion and the airbag that are overlapped with the peripheral edge of the back surface of the opening formed in the first core material. A storage portion for storing, the peripheral edge portion of the opening and the flange portion are overlapped and welded as a joint portion, and the peripheral portion surrounds the skin material side of the storage portion of the airbag by the flange portion; The door portion is closed, and a breakage portion that breaks due to the pressure when the airbag is inflated is provided in the door portion, and the door portion is opened between the door portion and the flange portion when the breakage portion breaks. The vehicle interior panel according to claim 1, wherein a hinge portion is provided.   The lattice-shaped rib for facilitating melting at the time of welding is provided on at least one of the welded portions of the first core member and the second core member. 4. The vehicle interior panel according to any one of 3 above.   The vehicle interior panel according to any one of claims 1 to 4, wherein the skin material is a urethane resin. A method for manufacturing a vehicle interior panel in which surfaces of a first core member and a second core member connected to each other are covered with a skin material by injection molding,
The first core member and the second core member are joined to each other so as to be overlapped and welded together, and each joint portion is provided on at least one of the joint portions on the outer portion of the weld portion. A superimposing step of interposing the corresponding projecting first protrusions,
A welding step of welding the joined portion of the first core material and the joined portion of the second core material, with the first protrusion closely contacting the mating joint portion;
The first core material and the second core material in which the respective joint portions are welded are set in a mold for injection molding of the skin material, and the skin material is formed on the surfaces of the first core material and the second core material. And a vehicle interior panel manufacturing method comprising: an injection process of injecting the molten material.   The core member having the joint portion on the side from which the skin material is injected out of the joint portions to be overlapped with each other is in contact with the end surface of the mating joint portion on the opposite side to the side on which the first protrusion is provided. The method for manufacturing a vehicle interior panel according to claim 6, wherein two protrusions are provided.   7. A grid-like rib for facilitating melting at the time of welding is provided on at least one of the welded portions of the first core member and the second core member. A method for manufacturing a vehicle interior panel according to claim 7.

Images