CN109080156B - Heat dissipation moulding bed for vehicle door interior trimming panel - Google Patents
Heat dissipation moulding bed for vehicle door interior trimming panel Download PDFInfo
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- CN109080156B CN109080156B CN201811061838.6A CN201811061838A CN109080156B CN 109080156 B CN109080156 B CN 109080156B CN 201811061838 A CN201811061838 A CN 201811061838A CN 109080156 B CN109080156 B CN 109080156B
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- heat dissipation
- trim panel
- vehicle door
- metal powder
- block
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- 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
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/81264—Mechanical properties, e.g. hardness
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- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
- B29C66/8183—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal conducting constructional aspects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
- B29K2995/0013—Conductive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
- B29L2031/3014—Door linings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The invention discloses a heat dissipation moulding bed for an interior trim panel of a vehicle door, which comprises a bottom plate, a plurality of elastic adhesive films, a plurality of rigid heat dissipation copper blocks and at least one metal powder rubber mixed heat dissipation block, wherein the elastic adhesive films, the rigid heat dissipation copper blocks and the metal powder rubber mixed heat dissipation block are distributed on the bottom plate to form a cavity, the interior trim panel of the vehicle door is placed in the cavity during ultrasonic welding, the elastic adhesive films are supported on a matte decoration surface of the interior trim panel of the vehicle door, the rigid heat dissipation copper blocks are supported at welding points of the matte decoration surface, and the metal powder rubber mixed heat dissipation block is supported on a highlight surface of the interior trim panel of the vehicle door. The metal powder and rubber mixed radiating block has the elastic characteristic of rubber and the radiating characteristic of metal powder, and combines the advantages of the rubber and the radiating characteristic of the metal powder, so that the problem of welding marks on a highlight surface can be solved, the original smooth and flat appearance is still kept on the highlight surface after welding, no deformation is generated, and the welding quality of the highlight surface is greatly improved.
Description
Technical Field
The invention relates to the technical field of molds, in particular to a radiating molding bed for an automotive door trim panel.
Background
At present, the interior trim of the door panel of the automobile is generally made of plastic, and various connecting pieces are assembled on the interior trim panel of the door to connect the interior trim panel of the door with a horn, an exterior panel of the door, a decorative panel and the like. The traditional assembly mode of the connecting pieces generally adopts manual assembly, however, in recent years, the automobile demand is greatly increased, the labor cost is higher and higher, in addition, the manual installation and welding cost is high, the efficiency is low, and the market demand cannot be met. Therefore, most automobile factories gradually use robots to weld and assemble connecting pieces to replace manual work, and the robots basically complete tasks for ordinary welding work. However, in recent years, in order to obtain a high aesthetic degree and visual effect of the interior decoration of the door panel of the automobile, a door panel body is generally provided with a plurality of plastic bright surfaces capable of imitating metal texture, the plastic bright surfaces and the door panel body are fastened together through ultrasonic welding, and a moulding bed is required to be used during welding.
The traditional high-gloss surface welding mode has two types, one type is that the high-gloss surface welding mode is directly supported on the surface of an elastic adhesive film, and the welding scattering quantity cannot be scattered due to the fact that the elastic adhesive film does not dissipate heat, so that the welding spot position of the car door interior trim panel cannot be cooled and shaped immediately after being melted, and welding marks are formed. In addition, the highlight surface of the vehicle door trim panel is very smooth and has a light reflection effect, and a slightly uneven welding mark is easily seen, so that the grade of the vehicle door trim panel is influenced. The welding mark is formed by that the colloid is reshaped after being melted and then is contracted like a wave.
The other high-gloss surface welding mode is that the high-gloss surface is directly supported on a rigid heat-dissipation copper mold during welding, the characteristic that the copper mold is easy to dissipate heat is utilized, the welding point position can be rapidly cooled and shaped, however, although the rigid heat-dissipation copper mold is good in heat dissipation, the rigid heat-dissipation copper mold is too hard in texture and free of elasticity, and welding marks still exist at the welding point position.
Therefore, the technical problem that qualified products cannot be welded all the time is solved.
Disclosure of Invention
In view of the above, the present invention is directed to the defects in the prior art, and the main object of the present invention is to provide a heat dissipation molding bed for a vehicle door trim panel, which can solve the problem of high gloss surface welding, thereby overcoming the disadvantages in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat dissipation moulding bed for an interior trim panel of a car door comprises a bottom plate, a plurality of elastic adhesive films and a plurality of rigid heat dissipation copper blocks, wherein the elastic adhesive films and the rigid heat dissipation copper blocks are arranged on the bottom plate to form a cavity for welding the interior trim panel of the car door, the elastic adhesive films are used for supporting a matte decoration surface of the interior trim panel of the car door, and the rigid heat dissipation copper blocks are used for supporting welding spot positions of the matte decoration surface; the bottom plate is provided with a metal powder rubber mixed radiating block, the metal powder rubber mixed radiating block has elasticity and heat dissipation performance, and the metal powder rubber mixed radiating block is used for supporting a high light surface of an interior trim panel of the car door.
As a preferable scheme, the metal powder rubber hybrid heat dissipation block is provided with a concave groove, and the concave groove corresponds to the position of a welding spot of a high light surface.
Preferably, the recess is provided with a blowing hole.
Preferably, two air blowing holes are arranged in each recess and are respectively positioned at two opposite sides of the edge position of the recess.
As a preferable scheme, each air blowing hole is communicated with an atmospheric chamber at the bottom, the atmospheric chamber is communicated with a main air inlet pipe, and the main air inlet pipe is connected with an inflator pump.
As a preferable scheme, the metal powder rubber mixed heat dissipation block is prepared by mixing copper powder and PU glue or A/B glue according to a certain proportion.
As a preferred scheme, a plurality of positioning blocks are arranged on the peripheral edge of the cavity, and oval adjusting holes are formed in the positioning blocks.
Preferably, a support mechanism is arranged in the cavity and used for supporting the inverted buckling position of the door trim panel.
As a preferred scheme, the supporting mechanism comprises a lifting cylinder and a supporting block, the supporting block is connected to the top of a piston rod of the lifting cylinder, and the lifting cylinder is fixed on a cylinder seat; the sliding device is characterized by further comprising a translation cylinder, a sliding rail and a sliding block, wherein a piston rod of the translation cylinder is connected with a cylinder seat, and the sliding rail and the sliding block are arranged between the cylinder seat and the bottom plate.
As a preferred scheme, the rigid heat dissipation copper block is embedded in the elastic adhesive film and forms seamless joint and smooth transition with the elastic adhesive film.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and particularly, according to the technical scheme, the highlight surface of the vehicle door trim panel is supported by the metal powder rubber mixed radiating block, the elasticity of the metal powder rubber mixed radiating block is between the rigid radiating copper block and the elastic adhesive film, so that the metal powder rubber mixed radiating block not only has the elastic characteristic of rubber, but also has the radiating characteristic of metal powder, and the advantages of the metal powder rubber mixed radiating block and the elastic adhesive film are combined together, so that the problem of welding mark of the highlight surface can be solved, the original smooth and flat appearance can be still maintained on the highlight surface after welding, no deformation is generated, and the welding quality of the highlight surface is greatly improved.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a perspective view of a tire mold according to an embodiment of the present invention.
FIG. 2 is a top view of a tire mold of an embodiment of the present invention.
Fig. 3 is a cross-sectional view at a-a in fig. 2.
Fig. 4 is a perspective view of a metal powder rubber hybrid heat dissipation block according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a metal powder rubber hybrid heat slug, in accordance with an embodiment of the present invention.
Fig. 6 is an enlarged view at a in fig. 1.
FIG. 7 is a perspective view of one of the elastic adhesive films according to the embodiment of the present invention.
Fig. 8 is a top view of an embodiment of the present invention.
Fig. 9 is an enlarged view at B in fig. 1.
The attached drawings indicate the following:
10. bottom plate 20, elastic glue film
30. Rigid heat dissipation copper block 40 and metal powder rubber mixed heat dissipation block
41. Air blowing hole 42, recess
43. Atmospheric chamber 44, total intake pipe
45. Inflator 50 and cavity
51. Positioning block 52, adjusting hole
60. Supporting mechanism 61 and lifting cylinder
62. Supporting block 63, piston rod
64. Translation cylinder 65, slide rail
66. A slide 67, a cylinder block.
Detailed Description
Referring to fig. 1 to 9, which show the specific structure of the preferred embodiment of the present invention, a heat dissipation molding bed for a vehicle door trim panel comprises a bottom plate 10, a plurality of elastic glue films 20, a plurality of rigid heat dissipation copper blocks 30, and at least one metal powder rubber hybrid heat dissipation block 40.
The elastic rubber film 20, the rigid heat dissipation copper block 30 and the metal powder rubber hybrid heat dissipation block 40 are arranged on the base plate 10 to form a cavity 50 for welding the door trim, and the arrangement modes can be mutually embedded, close to each other or have a gap. In this embodiment, the rigid heat dissipating copper block 30 is embedded in the elastic adhesive film 20, and forms a seamless joint and a smooth transition with the elastic adhesive film 20. The elastic adhesive film 20 is used for supporting a matte decorative surface of an interior trim panel of the vehicle door, and the rigid heat dissipation copper block 30 is used for supporting a welding spot position of the matte decorative surface; the metal powder rubber hybrid heat dissipation block 40 is used for supporting a high-gloss surface of a door trim panel. The metal powder and rubber mixed radiating block 40 has the elastic characteristic of rubber and the radiating characteristic of metal powder, and combines the advantages of the rubber and the radiating characteristic of the metal powder, so that the problem of welding mark of a highlight surface can be solved, the original smooth and flat appearance is still kept on the highlight surface after welding, no deformation is generated, and the welding quality of the highlight surface is greatly improved.
On this basis, when the highlight surface of the door trim panel reaches the mirror surface effect, the following processing is required: besides the metal powder rubber hybrid radiating block 40 is required to be used for supporting at the corresponding mirror surface position, a concave groove 42 is also required to be arranged on the metal powder rubber hybrid radiating block 40, and the concave groove 42 corresponds to the welding point position of the mirror surface. Furthermore, in order to achieve better effect, the air blowing holes 41 are formed in the concave grooves 42, and heat at the welding point position of the mirror surface is dissipated by air blowing, so that welding marks are avoided. The structure of the recess 42 can increase the contact surface between the metal powder rubber mixed radiating block 40 and the mirror surface, on one hand, the contact area is larger, on the other hand, the airflow blown out from the air blowing hole 41 flows on the recess 42, so that the temperature of the welding point position corresponding to the recess 42 is the lowest, and the zero welding mark problem of the mirror surface can be completely solved. Through batch experiments, the mirror surface interior trim panel adopts the mode that the metal powder and rubber mixed radiating block 40 is matched with the air blowing hole 41 and the concave groove 42 to carry out multiple radiation, and the welding mark rate generated at the position of a bright surface welding point is zero.
In the present embodiment, as shown in fig. 5, two blow holes are provided for each recess 42, and are located on opposite sides of the edge of the recess 42. That is, the blowing hole is not disposed at the center of the recess 42, but at the edge, because the center of the recess 42 is directly opposite to the center of the welding point, the glue at the center of the welding point is softened due to the high temperature during welding, and if the softened glue is directly blown by wind, the welding mark is aggravated. The two air blowing holes are arranged at the edge position, the air outlet does not face the welding point position of the door trim, and the air can be guided to the center of the welding point through the concave groove 42, so that the welding mark is avoided.
As shown in FIG. 5, each of the blowholes 41 communicates with an atmospheric chamber 43 at the bottom, the atmospheric chamber 43 communicates with an air manifold 44, and the air manifold 44 is connected to an inflator 45. The number of the inflator 45 is set to one or more as required. The inflator pump 45 is horizontally arranged or laterally arranged, so that the top of the inflator pump 45 does not protrude out of the cavity 50, and the door trim panel is not interfered when being placed in the cavity 50.
The metal powder rubber mixed heat dissipation block 40 is prepared by mixing copper powder and PU glue or A/B glue according to a certain proportion. Because the heat dissipation of the copper powder is good, the PU glue and the A/B glue have good elasticity, and the advantages of the PU glue and the A/B glue can be combined by mixing the PU glue and the A/B glue, so that the metal powder rubber mixed radiating block 40 with the elastic function and the heat dissipation function is formed.
As shown in fig. 7 and 8, a plurality of positioning blocks 51 are disposed on the outer periphery of the cavity 50, and an oval adjustment hole 52 is disposed on the positioning blocks 51. The traditional round screw hole is changed into the oval adjusting hole 52, when the screw is unscrewed, the positioning block 51 can be pushed inwards or pulled outwards to adjust the size of the cavity 50, so that the door trim panel is matched with the cavity 50 in size, and the moving of the positioning block 51 can adjust the force for pressing the door trim panel, so that the door trim panel cannot move in the welding process.
As shown in fig. 9, a support mechanism 60 is provided in the cavity 50 for supporting the door trim panel in the inverted position. The supporting mechanism 60 comprises a lifting cylinder 61 and a supporting block 62, the lifting cylinder 61 is fixed on a cylinder seat 67, and the supporting block 62 is connected to the top of a piston rod 63 of the lifting cylinder 61. Because of the irregular shape of the door trim panel, the support block 62 is required to move up and down and also to translate, and therefore, a translation cylinder 64 is designed on the base plate 10, and the translation cylinder 64 is connected with a cylinder block 67 through a sliding structure formed by a slide rail 65 and a slide block 66. During operation, the translation cylinder 64 pushes the cylinder seat 67 to move, and the lifting cylinder 61 pushes the supporting block 62 to lift, so that the position of the armrest of the door trim panel is pressed.
In summary, the design of the invention is characterized in that the metal powder rubber mixed radiating block 40 is adopted to support the highlight surface of the door trim panel, the elasticity of the metal powder rubber mixed radiating block 40 is between the rigid radiating copper block 30 and the elastic adhesive film 20, the metal powder rubber mixed radiating block has the elastic characteristic of rubber and the radiating characteristic of metal powder, and the advantages of the metal powder rubber mixed radiating block and the elastic adhesive film are combined together, so that the problem of welding mark of the highlight surface can be solved, the original smooth and flat appearance is still kept on the highlight surface after welding, no deformation is generated, and the welding quality of the highlight surface is greatly improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (10)
1. A heat dissipation moulding bed for an interior trim panel of a car door comprises a bottom plate, a plurality of elastic adhesive films and a plurality of rigid heat dissipation copper blocks, wherein the elastic adhesive films and the rigid heat dissipation copper blocks are arranged on the bottom plate to form a cavity for welding the interior trim panel of the car door, the elastic adhesive films are used for supporting a matte decoration surface of the interior trim panel of the car door, and the rigid heat dissipation copper blocks are used for supporting welding spot positions of the matte decoration surface; the method is characterized in that: the bottom plate is provided with a metal powder rubber mixed radiating block, the metal powder rubber mixed radiating block has elasticity and heat dissipation performance, and the metal powder rubber mixed radiating block is used for supporting a high light surface of an interior trim panel of the car door.
2. The heat dissipation molding bed of the vehicle door trim panel according to claim 1, characterized in that: the metal powder rubber mixed radiating block is provided with a concave groove corresponding to the welding spot position of the high light surface.
3. The heat dissipation molding bed of the vehicle door trim panel according to claim 2, characterized in that: the recess is provided with a blowing hole.
4. The heat dissipation molding bed of the vehicle door trim panel according to claim 3, characterized in that: two air blowing holes of each recess are respectively positioned at two opposite sides of the edge position of the recess.
5. The heat dissipation molding bed of the vehicle door trim panel according to claim 4, wherein: each air blowing hole is communicated with an atmospheric chamber at the bottom, the atmospheric chamber is communicated with a main air inlet pipe, and the main air inlet pipe is connected with an inflator pump.
6. The heat dissipation molding bed of the vehicle door trim panel according to claim 1, characterized in that: the metal powder rubber mixed radiating block is prepared by mixing copper powder and PU glue or A/B glue according to a certain proportion.
7. The heat dissipation molding bed of the vehicle door trim panel according to claim 1, characterized in that: the periphery of die cavity is equipped with the polylith locating piece, is equipped with oval-shaped regulation hole on this locating piece.
8. The heat dissipation molding bed of the vehicle door trim panel according to claim 1, characterized in that: and a supporting mechanism is arranged in the cavity and used for supporting the back-off position of the vehicle door trim panel.
9. The heat dissipation molding bed of the vehicle door trim panel according to claim 8, wherein: the supporting mechanism comprises a lifting cylinder and a supporting block, the supporting block is connected to the top of a piston rod of the lifting cylinder, and the lifting cylinder is fixed on a cylinder seat; the sliding device is characterized by further comprising a translation cylinder, a sliding rail and a sliding block, wherein a piston rod of the translation cylinder is connected with a cylinder seat, and the sliding rail and the sliding block are arranged between the cylinder seat and the bottom plate.
10. The heat dissipation molding bed of the vehicle door trim panel according to claim 1, characterized in that: the rigid heat dissipation copper block is embedded and fixed in the elastic adhesive film and forms seamless joint and smooth transition with the elastic adhesive film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811061838.6A CN109080156B (en) | 2018-09-12 | 2018-09-12 | Heat dissipation moulding bed for vehicle door interior trimming panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811061838.6A CN109080156B (en) | 2018-09-12 | 2018-09-12 | Heat dissipation moulding bed for vehicle door interior trimming panel |
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| CN109080156A CN109080156A (en) | 2018-12-25 |
| CN109080156B true CN109080156B (en) | 2021-09-07 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111660573A (en) * | 2020-04-15 | 2020-09-15 | 东风延锋汽车饰件系统有限公司 | Welding forming die with concave type face-falling blowing structure |
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