CN116917111A - Vehicle lamp and method for manufacturing vehicle lamp - Google Patents
Vehicle lamp and method for manufacturing vehicle lamp Download PDFInfo
- Publication number
- CN116917111A CN116917111A CN202280013347.2A CN202280013347A CN116917111A CN 116917111 A CN116917111 A CN 116917111A CN 202280013347 A CN202280013347 A CN 202280013347A CN 116917111 A CN116917111 A CN 116917111A
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- Prior art keywords
- welding
- lamp housing
- cover
- melted
- lamp
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 19
- 238000003466 welding Methods 0.000 claims abstract description 200
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims description 22
- 238000005304 joining Methods 0.000 description 12
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 239000011247 coating layer Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 4
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 3
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 3
- 229920001893 acrylonitrile styrene Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/29—Attachment thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
In a vehicle lamp including a lamp housing having an internal space and a cover covering the internal space, the cover and the lamp housing being joined by welding, an exterior surface portion having an exterior surface facing the outside of the vehicle and welding legs protruding from the exterior surface portion are provided in the cover, a welding joint portion joined to the welding legs is provided in the lamp housing, and the welding legs melted by heating by a hot plate are joined to the welding joint portion melted by irradiation of laser light. Accordingly, the welding joint is not melted by the hot plate, and the welding joint and the welding leg are melted separately without being in contact with each other, so that the stable joint state between the lamp housing and the cover can be ensured without increasing the manufacturing cost.
Description
Technical Field
The present invention relates to a vehicle lamp in which a lamp housing and a cover are joined by welding, and to a method for manufacturing the vehicle lamp.
Background
The vehicle lamp generally includes a lamp housing having an opening and a cover closing the opening, and the lamp housing and the cover are joined to form a lamp housing, and each portion required for a lamp unit and the like is disposed inside the lamp housing.
In such a vehicle lamp, there is a method based on adhesion using a hot flux as a method of joining a lamp housing and a cover, but in recent years, separation of the lamp housing and the hot flux is difficult, and in view of recycling of resources, there are many cases where the lamp housing and the cover are joined by welding.
Among methods of joining a lamp housing and a cover by welding, there is a method of welding by a hot plate (for example, refer to patent document 1). The method based on hot plate fusion has the following advantages: high weld strength is ensured, no consumable materials such as adhesive are required, the selection range of the resin to be subjected is wide, and the resin is suitable for joining products in three-dimensional shapes.
When the lamp housing and the cover are welded to each other by a hot plate, a welding joint is provided in the lamp housing, and welding legs protruding from the outer peripheral portion of the exterior surface portion are provided in the cover. The exterior surface portion is a portion of the outer surface facing the outside of the vehicle, and the welding leg portion is a portion joined to the welding joint portion by hot plate welding.
The joining of the lamp housing and the cover by the heat plate welding is performed by the following steps, in a state where the lamp housing and the cover are held by the first jig and the second jig, respectively, the joining portion for welding and the welding leg portion are melted by the heat plate on the lamp housing side and the heat plate on the cover side, respectively, and the heat plates of both are retracted from the lamp housing and the cover, and the second jig is moved in a direction approaching the first jig. The second clamp moves in a direction approaching the first clamp, so that the melted portion of the welding leg portion is pressed to the melted portion of the welding joint portion, and the welding leg portion and the welding joint portion are joined by welding.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2012-201015
Disclosure of Invention
Problems to be solved by the invention
However, the lamp housing is generally formed of a resin material such AS acrylonitrile-butadiene-styrene resin (ABS: acrylonitrile Butadiene Styrene), acrylonitrile-styrene resin (AS: acrylonitrile Styrene) or the like in consideration of manufacturing cost, ease of obtaining, or the like.
However, in these resin materials, when the heat plate is brought into contact with the welding joint portion and melted in terms of characteristics, there is a concern that a part of the welding joint portion melted when the heat plate is separated from the welding leg portion adheres to the heat plate, so-called stringing occurs.
Thus, the following operations are performed: the release treatment is performed by forming a coating layer of a fluororesin at a portion where the hot plate is in contact with the welding joint, and the hot plate is brought into contact with the welding joint via the coating layer, thereby preventing the occurrence of stringing.
However, since the release treatment of the coating layer is degraded by heat and pressure in the repeatedly performed melting operation, the coating layer needs to be formed again every certain period of time, and accordingly, the manufacturing cost of the vehicle lamp increases. In addition, if the reforming of the coating layer is performed every predetermined period, the melting operation cannot be performed during the reforming period, and the operation rate of the hot plate is reduced, so that another hot plate on which the coating layer is formed may be prepared in advance.
On the other hand, there is a method of joining a lamp housing and a cover by irradiation of laser light. The laser-based method proceeds by the steps of: the welding leg portion is irradiated with laser light through the cover to the welding joint portion of the lamp housing in a state where the welding leg portion is in contact with the welding joint portion, the welding joint portion is melted by the laser light, and heat of the laser light reaching the welding joint portion is conducted from the welding joint portion to the welding leg portion to melt the welding leg portion, so that the welding joint portion and the welding leg portion are welded.
However, the laser light may be irradiated in a state where a gap is generated between the welding leg portion and the welding joint portion due to the machining accuracy or the like, and in this case, there is a concern that heat conduction from the welding joint portion to the welding leg portion is insufficient and the welding state of the welding joint portion and the welding leg portion is unstable.
Accordingly, the present invention is directed to a vehicle lamp and a method for manufacturing the vehicle lamp, which are aimed at ensuring a stable joint state between a lamp housing and a cover without increasing manufacturing costs.
Means for solving the problems
In a first aspect, the present invention provides a vehicle lamp including a lamp housing having an internal space and a cover covering the internal space, wherein the cover is provided with an exterior surface portion of an outer surface facing an outside of a vehicle and a welding leg portion protruding from the exterior surface portion, and the lamp housing is provided with a welding joint portion joined to the welding leg portion, and the welding leg portion melted by heating by a hot plate is joined to the welding joint portion melted by irradiation of laser light.
Thus, the welding joint is not melted by the hot plate, and the welding joint and the welding leg are melted separately without being in contact with each other.
In the vehicle lamp according to the present invention, it is preferable that the lamp housing includes a main body portion having the internal space and a flange portion extending outward from an outer peripheral portion of the main body portion, and that the lamp housing includes a welding protrusion protruding from the flange portion as the welding joint portion.
Thus, the flange portion is not melted by the laser light, and thus the thickness of the flange portion is not thinned.
In the vehicle lamp according to the present invention, it is preferable that the width of the welding protrusion is larger than the width of the welding leg portion.
Thus, even when a large burr is generated in the welding leg portion, the burr hardly protrudes outward from the welding protrusion in the width direction after the welding protrusion and the welding leg portion are welded.
Fourth, in the vehicle lamp according to the present invention described above, it is preferable that the welding leg portion is heated in a state of not being in contact with the hot plate.
In this way, the welding leg portion is melted so that the heat plate does not contact the welding leg portion, and therefore, so-called stringing in which a part of the melted welding leg portion adheres to the heat plate when the heat plate is separated from the welding leg portion does not occur.
Fifth, the method for manufacturing a vehicle lamp according to the present invention is a method for manufacturing a vehicle lamp in which a lamp housing having an internal space and a cover covering the internal space are joined by welding, wherein welding legs protruding from an outer surface of the cover toward an outer surface of a vehicle are melted by heating with a hot plate, and welding joints are melted in the lamp housing by irradiation with laser light, and at least one direction of the lamp housing and the cover is moved in a direction toward the other direction to join the welding legs and the welding joints.
Thus, the welding joint is not melted by the hot plate, and the welding joint and the welding leg are melted separately without being in contact with each other.
Effects of the invention
According to the present invention, since the welding joint is not melted by the hot plate and the welding joint and the welding leg are melted separately in a state of not contacting each other, it is not necessary to perform a demolding process for preventing the occurrence of stringing or to prepare a hot plate for preparation, and a gap is not generated between the welding joint and the welding leg, which does not cause an increase in manufacturing cost, and a stable joint state between the lamp housing and the cover can be ensured.
Drawings
Fig. 1 and fig. 2 to 7 show embodiments of a vehicle lamp and a method of manufacturing the vehicle lamp according to the present invention, and the present figure is a cross-sectional view showing the vehicle lamp.
Fig. 2 is a cross-sectional view showing a portion after joining by welding.
Fig. 3 is a cross-sectional view showing a state in which the welding unit is moved between the lamp housing held by the first jig and the cover held by the second jig.
Fig. 4 is a cross-sectional view showing the state in which the welding leg portion of the cover is heated by the hot plate and laser light is irradiated to the welding protrusion portion of the lamp housing, in connection with fig. 3.
Fig. 5 is a cross-sectional view showing a state in which the welding unit is retracted and the lamp housing is coupled to the cover, following fig. 4.
Fig. 6 is a cross-sectional view showing a state after the welding protrusion is joined to the welding leg portion.
Fig. 7 is a cross-sectional view showing an inclination angle or the like of the outer peripheral portion of the cover.
Detailed Description
Hereinafter, modes for carrying out the vehicle lamp and the method for manufacturing the vehicle lamp according to the present invention will be described with reference to the drawings.
< construction of vehicle Lamp >)
First, the structure of the vehicle lamp 1 will be described (see fig. 1 and 2).
The vehicle lamp 1 has a lamp housing 2 and a cover 3, and the cover 3 is joined to the lamp housing 2 by welding. In the following description, for ease of understanding, the front-rear, up-down, left-right directions are shown corresponding to the positions where the lamp housing 2 and the cover 3 are held at the time of joining by welding. Therefore, the side where the cover 3 is located is the upper side, and the side where the lamp housing 2 is located is the lower side, and for convenience, the direction in which the outer peripheral portion of the cover 3 is located in the cross-sectional shape shown in the drawings is the left-right direction.
However, the directions of the front, rear, up, down, left and right are shown below for convenience of description, and the implementation of the present invention is not limited to these directions.
In the drawings to be referred to, the vehicle lamp 1 is shown as a simple shape with rotational symmetry, for the sake of easy understanding of the present invention.
As described above, in the vehicle lamp 1, the lamp housing 2 and the cover 3 are joined by welding, and predetermined portions of the lamp housing 2 and the cover 3 are respectively meltedIs pressed in a state to be joined (see figure
The lamp housing 2 is formed of a resin material such AS ABS resin or AS resin. The lamp housing 2 includes a concave main body portion 4 having an upper opening, an annular flange portion 5 extending outward from an upper end portion of the main body portion 4, and an annular welding protrusion portion 6 extending upward from the flange portion 5. In the lamp housing 2, a space inside the main body portion 4 is formed as an internal space 4a.
The welding protrusion 6 is provided as a welding joint 10 to be joined to the cover 3, and the front end surface is formed as a case-side joint surface 6a. The protrusion amount T of the welding protrusion 6 from the flange portion 5 is small, for example, 0.5mm or more and 2mm or less, and the width H1 of the welding protrusion 6 is, for example, 2mm or more and 4mm or less.
The cover 3 is formed of, for example, a transparent resin material such as acrylic, and the outer surface is formed integrally with the exterior surface portion 7 facing the outside of the vehicle and the welding leg portion 8 protruding from a portion near the outer periphery of the interior surface 7a of the exterior surface portion 7. The cover 3 is joined to the lamp housing 2 in a state of covering the inner space 4a.
The exterior surface 7 is curved so as to be convex to the opposite side of the lamp housing 2 in accordance with the shape of the vehicle body, and is formed in a curved surface shape. The front end surface of the welding leg portion 8 is formed as a cover-side engaging surface 8a. In the welding leg portion 8, the protruding amount from the exterior surface portion 7 is slightly larger than the protruding amount T of the welding protrusion portion 6, and the width H2 is set to be, for example, 1.5mm or more and 4mm or less. Therefore, the width H1 of the welding protrusion 6 is larger than the width H2 of the welding leg 8.
< constitution of welding Unit >
Next, the structure of the welding unit 30 for joining the lamp housing 2 and the cover 3 will be described (see fig. 3).
The fusing unit 30 includes, for example, a flat plate-shaped base 40, a hot plate 50 disposed on an upper surface of the base 40, and a laser irradiation device 60 disposed on a lower surface of the base 40.
The heat plate 50 includes a heat plate body 51 attached to the base 40, and an annular heat conductive protrusion 52 protruding upward from the heat plate body 51. The front end surface of the heat conduction protrusion 52 is formed as a heat conduction surface 52a.
Laser light is irradiated from the laser irradiation device 60 toward the case-side joint surface 6a formed on the welding protrusion 6 of the lamp case 2. The laser irradiation device 60 may be a so-called XY laser irradiation device in which the laser head is moved to a position corresponding to the irradiation position to irradiate the laser beam, or may be a so-called galvano laser irradiation device in which the laser head is fixed and a mirror is operated to irradiate the laser beam to the irradiation position.
Process for bonding
Hereinafter, a process of the joining operation by welding the lamp housing 2 and the cover 3 will be briefly described (see fig. 3 to 6).
When the lamp housing 2 and the cover 3 are joined by welding, the lamp housing 2 and the cover 3 are held by the first jig 70 and the second jig 80, respectively, and the cover 3 is positioned above the lamp housing 2 in a spaced apart relation from the lamp housing 2.
Next, the welding unit 30 is moved between the lamp housing 2 and the cover 3 in a state where the lamp housing 2 and the cover 3 are held by the first jig 70 and the second jig 80, respectively (see fig. 3).
When the welding unit 30 moves between the lamp housing 2 and the cover 3, for example, the second jig 80 moves downward, and the cover-side joint surface 8a formed on the welding leg portion 8 of the cover 3 comes into contact with the heat conduction surface 52a of the heat conduction protrusion 52 formed on the heat plate 50 (see fig. 4). When the cover-side joint surface 8a comes into contact with the heat conductive surface 52a, the welding leg portion 8 is heated by the hot plate 50, and the tip end portion of the welding leg portion 8 is melted.
On the other hand, when the welding unit 30 moves between the lamp housing 2 and the cover 3, laser light is irradiated from the laser irradiation device 60 toward the housing-side joint surface 6a of the welding protrusion 6 formed on the lamp housing 2, and the tip end portion of the welding protrusion 6 is melted.
The melting of the welding leg portion 8 by the hot plate 50 and the melting of the welding protrusion portion 6 by the laser irradiation device 60 are performed simultaneously and ended simultaneously, for example.
Next, the welding unit 30 moves to retract from between the lamp housing 2 and the cover 3, and the second jig 80 moves downward, so that the welding leg portion 8 of the cover 3 in a molten state is pressed against the welding protrusion portion 6 of the lamp housing 2 in a molten state, and the welding protrusion portion 6 and the welding leg portion 8 are joined by welding (see fig. 5). In this case, the first clamp 70 may be moved upward or the first clamp 70 and the second clamp 80 may be moved upward and downward, and the welding leg portion 8 may be pressed against the welding protrusion 6.
Since both the welding protrusion 6 and the welding leg 8 are pressed and joined in a melted state, burrs 6b and 8b (see fig. 6) may be generated as residues on so-called members in which the distal ends of the welding protrusion 6 and the welding leg 8 bulge outward. In particular, since the welding leg portion 8 melted by the hot plate 50 is pressurized at the time of melting, burrs 8b are easily generated at the time of melting, and further large burrs 8b are easily formed at the time of joining with the welding protrusion 6.
However, in the vehicle lamp 1, as described above, the width H1 of the welding protrusion 6 is larger than the width H2 of the welding leg 8. Therefore, even when the large burr 8b is generated in the welding leg portion 8, the burr 8b hardly protrudes outward from the welding protrusion 6 in the width direction when the welding protrusion 6 and the welding leg portion 8 are welded, and the visibility when the welded portion is visually confirmed by the cover 3 can be improved.
As described above, when the welding protrusion 6 is joined to the welding leg 8, after cooling for a predetermined period of time, the lamp housing 2 and the cover 3 are taken out from the first jig 70 and the second jig 80, respectively, and the joining operation of the lamp housing 2 and the cover 3 by welding is completed.
The lamp housing 2 is joined to the cover 3, and the lamp housing 2 and the cover 3 form a lamp housing 9 (see fig. 1). The lamp housing 9 is internally formed with a lamp chamber 9a, and a lamp unit, not shown, having respective portions necessary for a light source, a reflector, and the like is disposed in the lamp chamber 9a to constitute the vehicle lamp 1. In the vehicle lamp 1, light emitted from a light source is emitted to the outside through the cover 3.
In the above, the example in which the heating of the welding leg portion 8 by the hot plate 50 is performed in a state where the cover-side joint surface 8a of the welding leg portion 8 is in contact with the heat conductive surface 52a of the heat conductive protrusion 52 is shown, but the heating of the welding leg portion 8 by the hot plate 50 may be performed in a state where the cover-side joint surface 8a is not in contact with the heat conductive surface 52a. In this case, the welding leg portion 8 is heated by the hot plate 50 at a high temperature of, for example, about 500 degrees in a state where a slight gap is provided between the cover-side joint surface 8a and the heat conductive surface 52a.
By heating the welding leg portion 8 by the hot plate 50 at such a high temperature, the tip end portion of the welding leg portion 8 is sufficiently melted.
Since the welding leg portion 8 is heated in a state of not contacting the heat plate 50, the welding leg portion 8 is melted so that the heat plate 50 does not contact the welding leg portion 8, so-called stringing, in which a part of the welding leg portion 8 melted when the heat plate 50 is separated from the welding leg portion 8 adheres to the heat plate 50, is not generated, and a good melted state of the welding leg portion 8 can be ensured.
In the above description, the example of the welding protrusion 6 of the lamp housing 2 being irradiated with the laser light by the laser irradiation device 60 has been shown, but the irradiation with the laser light by the laser irradiation device 60 may be performed by a configuration in which the welding protrusion 6 is not provided in the lamp housing 2. In this case, the lamp housing 2 is not provided with the welding protrusion 6, and the flange 5 is irradiated with laser light. Therefore, the flange portion 5 is provided as the welding joint portion 10, and the flange portion 5 after being melted is joined to the welding leg portion 8 after being melted.
However, in this case, a part of the flange portion 5 is melted, and the thickness of the flange portion 5 is reduced, and there is a possibility that sufficient strength of the flange portion 5 cannot be ensured.
Therefore, as described above, by providing the welding protrusion 6 protruding from the flange portion 5 as the welding joint 10, the flange portion 5 is not melted by the laser light, and therefore the thickness of the flange portion 5 is not thinned, and high strength of the flange portion 5 can be ensured. Further, since the portion protruding from the flange portion 5 is the irradiation target of the laser light, the welding protrusion 6 protrudes from the flange portion 5 and becomes an index of the irradiation position of the laser light, so that the welding joint 10 can be accurately irradiated with the laser light.
< summary >
As described above, in the vehicle lamp 1, the exterior surface portion 7 and the welding leg portion 8 are provided in the cover 3, the welding joint portion 10 (the welding protrusion 6 or the flange portion 5) is provided in the lamp housing 2, and the welding leg portion 8 melted by heating by the hot plate 50 is joined to the welding joint portion 10 melted by irradiation of laser light.
Therefore, since the welding joint 10 is not melted by the hot plate 50 and the welding joint 10 and the welding leg 8 are melted separately without being in contact with each other, there is no need to perform a coating-based mold release process for preventing wire drawing such as when the welding joint 10 is heated by the hot plate, and there is no fear of occurrence of a failure such as insufficient conduction of heat in the case where a gap is generated between the lamp housing 2 and the cover 3 when they are joined by irradiation of laser light. This ensures a stable joint state between the lamp housing 2 and the cover 3 without increasing the manufacturing cost.
In the method of manufacturing the vehicle lamp 1, the welding leg portion 8 protruding from the exterior surface portion 7 in the cover 3 is melted by heating by the hot plate 50, and the welding joint portion 10 (the welding protrusion 6 or the flange portion 5) in the lamp housing 2 is melted by irradiation of laser light, so that at least one direction of the lamp housing 2 and the cover 3 is moved in the direction approaching the other direction, and the welding leg portion 8 is joined to the welding joint portion 10.
Therefore, as in the case of the vehicle lamp 1, there is no need to perform a coating-based release treatment for preventing wire drawing and there is no risk of occurrence of failure of insufficient conduction of heat, and therefore, a stable joint state between the lamp housing 2 and the cover 3 can be ensured without causing an increase in manufacturing cost.
Further, when the lamp housing 2 and the cover 3 are joined by irradiation with laser light, as shown in fig. 7, the laser light R transmitted through the outer peripheral portion 7b of the outer surface portion 7 of the cover 3 is mostly irradiated to the flange portion 5 in a state where the welding protrusion 6 and the welding leg portion 8 are not present and the outer peripheral portion 7b of the outer surface portion 7 of the cover 3 is in contact with the flange portion 5 of the lamp housing 2. At this time, the cover 3 is pressed against the lamp housing 2 from the vertical direction V and the outer peripheral portion 7b is pressed against the flange portion 5, but if the inclination angle P of the outer peripheral portion 7b with respect to the horizontal direction is too large, a sufficient pressing force of the outer peripheral portion 7b against the flange portion 5 may not be ensured and a gap may be generated between the outer peripheral portion 7b and the flange portion 5. Therefore, the inclination angle P of the outer peripheral portion 7b with respect to the horizontal direction needs to be within a certain angle, for example, an angle within 30 degrees.
On the other hand, in the vehicle lamp 1, since the cover 3 is melted by the hot plate 50 and the lamp housing 2 is melted by the irradiation of the laser light, the irradiation of the laser light is not performed in a state where the outer peripheral portion 7b of the exterior surface portion 7 is pressed against the flange portion 5, and accordingly, the inclination angle P of the outer peripheral portion 7b of the exterior surface portion 7 with respect to the horizontal direction can be enlarged. Accordingly, the degree of freedom in the shape of the lamp housing 2 in which the cover 3 and the cover 3 are joined is increased, and the degree of freedom in design of the vehicle lamp 1 can be improved.
Further, since the lamp housing 2 and the cover 3 are joined without performing an operation of transmitting the laser light through the outer peripheral portion 7b of the exterior surface portion 7, the outer peripheral portion 7b of the exterior surface portion 7 can be colored in a dark color, for example, formed of a black material, or the outer peripheral portion 7b of the exterior surface portion 7 is made in a dark color without providing a configuration of transmitting the laser light through the outer peripheral portion 7b of the exterior surface portion 7.
By making the outer peripheral portion 7b of the exterior surface portion 7 dark in this way, unnecessary light from among the light emitted from the light source can be blocked by the outer peripheral portion 7b, and the exterior of the vehicle lamp 1 can be improved by making the outer peripheral portion 7b of the exterior surface portion 7 dark. Further, by making the outer peripheral portion 7b of the exterior surface portion 7 dark, it is difficult to visually confirm the internal structure when the vehicle lamp 1 is visually confirmed from the outside through the cover 3, so that the exterior appearance can be further improved, and the extension portion for shielding the internal structure can be omitted, thereby simplifying the internal structure and reducing the manufacturing cost.
Further, since the welding joint 10 of the lamp housing 2 is melted by irradiation with the laser light, it is possible to reduce the manufacturing cost of the vehicle lamp 1 by changing the irradiation angle, irradiation position, and the like of the laser light for each manufactured product, thereby enabling so-called switching in which different types of products are manufactured by the same manufacturing line. In addition, in the manufacture of the lamp housing 2, it is not necessary to use heat plates of different shapes and sizes for each manufactured product, and thus further reduction in the manufacturing cost of the vehicle lamp 1 can be achieved.
Further, by providing a structure in which the laser is irradiated by the current laser irradiation device in which the laser head is fixed and the mirror is operated, the laser can be repeatedly irradiated around the case-side joint surface 6a of the welding protrusion 6 at a high speed, and the entire case-side joint surface 6a can be heated at the same time, so that the work efficiency in the melting work can be improved.
Description of the reference numerals
1: a lamp for a vehicle;
2: a lamp housing;
3: a cover;
4: a main body portion;
4a: an inner space;
5: a flange portion;
6: a welding protrusion;
7: an appearance face;
8: welding the leg portions;
10: a welding joint;
50: and (5) a hot plate.
Claims (5)
1. A vehicle lamp comprising a lamp housing having an internal space and a cover covering the internal space, wherein the cover and the lamp housing are joined by welding,
the cover is provided with an appearance face part with an outer surface facing the outer side of the vehicle and a welding leg part protruding from the appearance face part,
the lamp housing is provided with a welding joint part which is jointed with the welding leg part,
the welding leg portion melted by heating by the hot plate is joined to the welding joint portion melted by irradiation of laser light.
2. The vehicular lamp according to claim 1, wherein,
the lamp housing is provided with a main body part having the internal space and a flange part extending outward from the outer peripheral part of the main body part,
the lamp housing is provided with a welding protrusion protruding from the flange portion as the welding joint portion.
3. The vehicular lamp according to claim 2, wherein,
the width of the welding protrusion is larger than the width of the welding leg.
4. The vehicular lamp according to any one of claims 1 to 3, wherein,
the welding leg portion is heated in a state of not contacting the hot plate.
5. A method for manufacturing a vehicle lamp, wherein a lamp housing having an internal space and a cover covering the internal space are joined by welding,
a welding leg portion protruding from an outer surface of the cover toward an outer surface of the vehicle is melted by heating of a hot plate, and a welding joint portion is melted by irradiation of laser light in the lamp housing,
at least one of the lamp housing and the cover is moved in a direction toward the other so that the welding leg portion is joined to the welding joint portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-027750 | 2021-02-24 | ||
| JP2021027750 | 2021-02-24 | ||
| PCT/JP2022/003041 WO2022181173A1 (en) | 2021-02-24 | 2022-01-27 | Lamp fixture for vehicle and method for manufacturing lamp fixture for vehicle |
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| CN116917111A true CN116917111A (en) | 2023-10-20 |
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| CN202280013347.2A Pending CN116917111A (en) | 2021-02-24 | 2022-01-27 | Vehicle lamp and method for manufacturing vehicle lamp |
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| JP (1) | JPWO2022181173A1 (en) |
| CN (1) | CN116917111A (en) |
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| WO2011145628A1 (en) * | 2010-05-18 | 2011-11-24 | テクノポリマー株式会社 | Thermoplastic resin composition for lamp housings, and molded articles |
| JP7283076B2 (en) * | 2018-12-27 | 2023-05-30 | 市光工業株式会社 | vehicle lamp |
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- 2022-01-27 JP JP2023502190A patent/JPWO2022181173A1/ja active Pending
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| WO2022181173A1 (en) | 2022-09-01 |
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