CN117325779A - Automobile bottom guard board and manufacturing method thereof - Google Patents
Automobile bottom guard board and manufacturing method thereof Download PDFInfo
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- CN117325779A CN117325779A CN202311548136.1A CN202311548136A CN117325779A CN 117325779 A CN117325779 A CN 117325779A CN 202311548136 A CN202311548136 A CN 202311548136A CN 117325779 A CN117325779 A CN 117325779A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000004080 punching Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 238000007493 shaping process Methods 0.000 claims abstract description 25
- 238000005452 bending Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 11
- 238000009423 ventilation Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000003856 thermoforming Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 8
- 239000003365 glass fiber Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 208000003251 Pruritus Diseases 0.000 description 1
- 206010040880 Skin irritation Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000002249 digestive system Anatomy 0.000 description 1
- 208000010643 digestive system disease Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007803 itching Effects 0.000 description 1
- 231100000516 lung damage Toxicity 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000036556 skin irritation Effects 0.000 description 1
- 231100000475 skin irritation Toxicity 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0861—Insulating elements, e.g. for sound insulation for covering undersurfaces of vehicles, e.g. wheel houses
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention relates to an automobile bottom guard board and a manufacturing method thereof. The automobile bottom guard board comprises a guard part; the bending part is bent towards the bottom of the engine and symmetrically arranged at two sides of the protection part; the bottom guard board is attached to the bottom of the automobile engine. The manufacturing method comprises the following steps: material receiving; hot press molding; cooling and shaping; and (5) cold press punching. Compared with the prior art, the invention protects the engine, improves the safety and has good environmental protection performance.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to an automobile bottom guard board and a manufacturing method thereof.
Background
The bottom guard plate part is mainly arranged at the bottom of an automobile engine and has the main effects that: the chassis is prevented from rubbing the support bottom, and the vehicle can also prevent the pits and foreign matters on the road from striking the engine oil pan when walking on the rotten road, especially the vehicle with small chassis gap; the rainwater and soil are prevented from being thrown into the engine cabin, the electric appliance part is prevented from being wetted by water to cause trouble, metal parts or equipment in the electric appliance part are corroded over time, or the mud covers the engine, so that the heat dissipation level of the engine is reduced; the stones pressed and rolled by the tire are prevented from knocking the engine cylinder, and huge impact force is blocked. The service life of the engine is prolonged through a series of designs, and the automobile is prevented from being anchored due to damage of the engine caused by external factors in the traveling process.
At present, enterprises capable of producing parts made of the material are few in China, and basically produce the parts according to the flame retardant standard of GB8410, and the parts are general in safety performance of automobiles. The commercially available bottom guard plates are all made of LWRT, and the LWRT material is brittle and poor in wear resistance. Because the material contains glass fibers, occasional contact is not problematic and if the material is improperly protected for a long period of time, contact is more dangerous. Because glass fibers can irritate the skin, cause skin irritation and itching, and can drill deep layers, causing greater injury. If inhaled into the respiratory tract, human beings may cause lung damage, enter the digestive system, and may also cause digestive system diseases. And glass fibers are non-degradable materials, post waste treatment can be a problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an automobile bottom guard board and a manufacturing method thereof.
The aim of the invention can be achieved by the following technical scheme:
the first aspect of the present invention provides an automobile floor guard, comprising:
a protective part; and
the bending parts are bent towards the bottom of the engine and are symmetrically arranged at two sides of the protection part; the bottom guard board is attached to the bottom of the automobile engine.
Further, the guard portion includes:
the two sides of the protection part body are connected with the bending part;
the strip-shaped grooves are divided into a plurality of rows and are arranged on the protection part body side by side; and
a plurality of ventilation holes which are arranged between two adjacent rows of strip-shaped grooves or are arranged at the edge of the protective part body;
the strip-shaped groove is used for enhancing strength of the protection part, and the air holes are used for radiating and exhausting of an automobile engine.
Further, the strip-shaped grooves are arranged in two rows.
Further, two air holes are formed in the air hole.
Further, the bending part includes:
the bending part body and the protection part form an arc which is clung to the bottom of the engine; and
the mounting hole is provided with a plurality of and is positioned at the edge of the bending part body.
The mounting hole is provided with a plurality of and is positioned at the edge of the bending part body.
The invention also provides a manufacturing method of the automobile bottom guard board, which comprises the following steps:
s1: and (3) material receiving: taking a long fiber PET raw material;
s2: hot press molding: placing the long fiber PET raw material into a hot-press forming die, and performing part heating forming treatment to obtain a semi-finished part with waste after forming;
s3: cooling and shaping: cooling and shaping the semi-finished part with the scraps after the molding in the step S2, placing the semi-finished part on a cooling tool, starting the tool after aligning with the alignment holes of the scraps area, and cooling and shaping to obtain the cooled and shaped semi-finished part;
s4: cold press punching: and (3) carrying out cold press punching on the semi-finished part after cooling and shaping in the step (S3) to obtain the automobile bottom guard board.
Further, in S2, the specific operation of thermoforming is: and (3) placing the long fiber PET on a hot press forming die, wherein the die temperature is 100-150 ℃, the die pressure is 15-30Mpa, and the pressure maintaining time is 20-60s.
In a preferred embodiment of the present invention, in S2, the specific operation of thermoforming is: and (3) placing the long fiber PET on a hot-press forming die, wherein the die temperature is 110-115 ℃, the die pressure is 15-17 Mpa, and the pressure maintaining time is 25-35 s.
More preferably, in S2, the specific operation of thermoforming is: the long fiber PET is placed on a hot press forming die, the die temperature is 115 ℃, the die pressure is 15Mpa, and the dwell time is 30s.
Further, in S3, specific conditions for cooling shaping are: the cooling time is 30-60s.
As a preferred mode of the present invention, in S3, the specific operation of cooling shaping is: the cooling time is 35-45s.
More preferably, in S3, the specific operation of cooling shaping is: the cooling time was 40s.
Further, in S4, the specific operation of cold press punching is: and (3) placing the cooled and shaped PET semi-finished part on a cold press punching die, starting a press, and finishing die assembly and waste punching.
Still further, the conditions for die cutting the scrap are: punching for 10-30s, wherein the punching pressure is 15-30Mpa.
As a preferred mode of the present invention, the conditions for punching the scrap are: punching for 10-15 s, wherein the punching pressure is 18-20 Mpa.
More preferably, in S5, the conditions for die cutting the scrap are: punching for 12s, wherein the punching pressure is 19Mpa.
Compared with the prior art, the invention has the following beneficial effects:
(1) The PET long fiber composite material is used, does not contain glass fiber or carbon fiber, is integrally formed, and is more environment-friendly.
(2) The PET composite material is light enough, so that the weight of parts is reduced, and the high strength, excellent NVH performance, flame retardance and the like are provided.
(3) The invention has simple and easy manufacturing process and can be produced in large scale.
Drawings
Fig. 1 is a schematic view showing the structure of a car bottom fender in embodiment 1.
FIG. 2 is a schematic view showing a process for producing a underbody shield of example 2.
Reference numerals in the drawings:
1-a protective part, 101-a protective part body, 102-a strip-shaped groove, 103-an air hole, 2-a bending part, 201-a bending part body and 202-a mounting hole.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Features such as a part model, a material name, a connection structure, a control method and the like which are not explicitly described in the technical scheme are all regarded as common technical features disclosed in the prior art.
In the description of the present invention, it should be understood that the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection can be bolt connection or welding connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In order to protect an engine, improve safety, and allow for easy disposal of waste materials, the present invention provides an automobile underbody shield, the structure of which is shown in fig. 1, comprising:
a guard 1; and
the bending parts 2 are bent towards the bottom of the engine and symmetrically arranged at two sides of the protection part 1; the bottom guard board is attached to the bottom of the automobile engine.
In some specific embodiments, referring to fig. 1, the protecting portion 1 includes:
a protective part body 101, both sides of which are connected with the bending part 2;
a plurality of strip-shaped grooves 102 which are divided into a plurality of rows and are arranged on the guard body 101 side by side; and
a plurality of ventilation holes 103 which are arranged between two adjacent rows of strip-shaped grooves or are arranged at the edge of the protection part body 101;
the strip-shaped groove 102 is used for enhancing the strength of the protection part 1, and the ventilation holes 103 are used for heat dissipation and exhaust of an automobile engine.
In a more specific embodiment, referring again to fig. 1, the strip-shaped grooves 102 are arranged in two rows.
In a more specific embodiment, referring to fig. 1 again, two ventilation holes 103 are provided.
In some specific embodiments, referring to fig. 1, the bending portion 2 includes:
a bending part body 201 which forms an arc which is tightly attached to the bottom of the engine with the protection part 1; and
the mounting holes 202 are provided with a plurality of mounting holes and are positioned at the edge of the bending part body 201.
The invention also provides a manufacturing method of the automobile bottom guard board, which specifically comprises the following steps, referring to fig. 2:
s1: and (3) material receiving: taking a long fiber PET raw material;
s2: hot press molding: placing the long fiber PET raw material into a hot-press forming die, and performing part heating forming treatment to obtain a semi-finished part with waste after forming;
s3: cooling and shaping: cooling and shaping the semi-finished part with the scraps after the molding in the step S2, placing the semi-finished part on a cooling tool, starting the tool after aligning with the alignment holes of the scraps area, and cooling and shaping to obtain the cooled and shaped semi-finished part;
s4: cold press punching: and (3) carrying out cold press punching on the semi-finished part after cooling and shaping in the step (S3) to obtain the automobile bottom guard board.
In some embodiments, referring again to fig. 2, in S2, the specific operation of thermoforming is: and (3) placing the long fiber PET on a hot press forming die, wherein the die temperature is 100-150 ℃, the die pressure is 15-30Mpa, and the pressure maintaining time is 20-60s.
In some embodiments, referring again to fig. 2, in S3, the specific conditions for cooling shaping are: the cooling time is 30-60s.
In some embodiments, referring again to fig. 2, in S4, the cold press die-cutting is specifically performed as follows: and (3) placing the cooled and shaped PET semi-finished part on a cold press punching die, starting a press, and finishing die assembly and waste punching.
In a more specific embodiment, referring again to fig. 2, the conditions for die cutting the scrap are: punching for 10-30s, wherein the punching pressure is 15-30Mpa.
The above embodiments may be implemented singly or in any combination of two or more.
The above embodiments are described in more detail below in connection with specific examples.
Example 1
In order to protect an engine, improve safety, and allow for easy disposal of waste materials, the present embodiment provides an automobile underbody shield, the structure of which is shown in fig. 1, comprising:
a guard 1; and
the bending parts 2 are bent towards the bottom of the engine and symmetrically arranged at two sides of the protection part 1; the bottom guard board is attached to the bottom of the automobile engine.
Referring again to fig. 1, the guard 1 includes:
a protective part body 101, both sides of which are connected with the bending part 2;
a plurality of strip-shaped grooves 102 which are divided into a plurality of rows and are arranged on the guard body 101 side by side; and a plurality of ventilation holes 103 which are arranged between two adjacent rows of strip-shaped grooves or at the edge of the protection part body 101;
the strip-shaped groove 102 is used for enhancing the strength of the protection part 1, and the ventilation holes 103 are used for heat dissipation and exhaust of an automobile engine.
Referring again to fig. 1, the strip-shaped grooves 102 are arranged in two rows.
Referring to fig. 1 again, two ventilation holes 103 are provided.
Referring to fig. 1 again, the bending portion 2 includes:
a bending part body 201 which forms an arc which is tightly attached to the bottom of the engine with the protection part 1; and
the mounting holes 202 are provided with a plurality of mounting holes and are positioned at the edge of the bending part body 201.
Example 2
The embodiment provides a method for manufacturing an automobile bottom guard board in embodiment 1, and the specific flow steps are shown in fig. 2, including the following steps:
s1: and (3) material receiving: taking a long fiber PET raw material;
s2: hot press molding: placing the long fiber PET raw material into a hot-press forming die, and performing part heating forming treatment to obtain a semi-finished part with waste after forming;
s3: cooling and shaping: cooling and shaping the semi-finished part with the scraps after the molding in the step S2, placing the semi-finished part on a cooling tool, starting the tool after aligning with the alignment holes of the scraps area, and cooling and shaping to obtain the cooled and shaped semi-finished part;
s4: cold press punching: and (3) carrying out cold press punching on the semi-finished part after cooling and shaping in the step (S3) to obtain the automobile bottom guard board. It should be noted that, in punching, the positioning holes of the scrap region are aligned, and a 500T press is used.
Referring again to fig. 2, in S2, the specific operation of thermoforming is: the long fiber PET is placed on a hot press forming die, the die temperature is 115 ℃, the die pressure is 15Mpa, and the dwell time is 30s.
Referring to fig. 2 again, in S3, specific conditions for cooling and shaping are: the cooling time was 40s.
Referring again to fig. 2, in S4, the specific operation of cold press die cutting is: and (3) placing the cooled and shaped PET semi-finished part on a cold press punching die, starting a press, and finishing die assembly and waste punching.
Referring again to fig. 2, the conditions for die cutting the scrap are: punching for 12s, wherein the punching pressure is 19Mpa.
The background guard plate was 1400g/m 2 Is a PET material of the (B).
Example 3
In comparison with example 2, the process was largely identical, except that the specific operation of thermoforming was: the long fiber PET was placed on a hot press molding die at a die temperature of 100, a die pressure of 15MPa, and a dwell time of 20s.
Example 4
In comparison with example 2, the process was largely identical, except that the specific operation of thermoforming was: the long fiber PET is placed on a hot press forming die, the die temperature is 150 ℃, the die pressure is 30Mpa, and the dwell time is 60s.
Example 5
In comparison with example 2, the method is largely the same except that the specific conditions for cooling and shaping are as follows: the cooling time was 30s.
Example 6
In comparison with example 2, the method is largely the same except that the specific conditions for cooling and shaping are as follows: the cooling time was 60s.
Example 7
In comparison with example 2, the vast majority of the same except that the conditions for die cutting the scrap are: punching for 10s, wherein the punching pressure is 30Mpa.
Example 8
In comparison with example 2, the vast majority of the same except that the conditions for die cutting the scrap are: punching for 30s, wherein the punching pressure is 15Mpa.
Performance comparison:
1. mechanical-tensile Strength test, test Standard BS EN ISO 527-4 (1997.4)
2. Mechanical elongation at break test with BS EN ISO 527-4 (1997.4)
The test results were as follows:
| mechanical-stretching length (Mpa) | Mechanical-breaking elongationLong Rate (%) | |
| EXAMPLE 2PET 1400g/m 2 | 27.68、27.27、28.37 | 30.3、9.6、29.5 |
| LWRT-1400g/m 2 | 18.94、18.45、19.81 | 1.70、0.7、1.2 |
From a comparison of the performance of example 2 and the conventional LWRT base guard plates, it was found that the strength and toughness of the base guard plates made from PET materials used in the present application were both strong.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. An automotive underbody shield, comprising:
a protection part (1); and
the bending parts (2) are bent towards the bottom of the engine and are symmetrically arranged at two sides of the protection part (1); the bottom guard board is attached to the bottom of the automobile engine.
2. The automotive underbody shield according to claim 1, characterized in that the shield portion (1) comprises:
a protective part body (101) with two sides connected with the bending part (2);
a plurality of strip-shaped grooves (102) which are divided into a plurality of rows and are arranged on the protection part body (101) side by side; and
a plurality of ventilation holes (103) which are arranged between two adjacent rows of strip-shaped grooves or are arranged at the edge of the protection part body (101);
the strip-shaped groove (102) is used for enhancing the strength of the protection part (1), and the ventilation holes (103) are used for radiating and exhausting of an automobile engine.
3. An automotive underbody shield according to claim 2, characterized in that the strip-shaped grooves (102) are arranged in two rows.
4. An automotive underbody shield according to claim 2, characterized in that two ventilation holes (103) are provided.
5. The automotive underbody shield according to claim 1, characterized in that the bent portion (2) comprises:
a bending part body (201) which forms an arc which is tightly attached to the bottom of the engine with the protection part (1); and
and the mounting holes (202) are provided with a plurality of and are positioned at the edge of the bending part body (201).
6. A method of making an automotive underbody shield as claimed in any one of claims 1 to 5 comprising the steps of:
s1: and (3) material receiving: taking a long fiber PET raw material;
s2: hot press molding: placing the long fiber PET raw material into a hot-press forming die, and performing part heating forming treatment to obtain a semi-finished part with waste after forming;
s3: cooling and shaping: cooling and shaping the semi-finished part with the scraps after the molding in the step S2, placing the semi-finished part on a cooling tool, starting the tool after aligning with the alignment holes of the scraps area, and cooling and shaping to obtain the cooled and shaped semi-finished part;
s4: cold press punching: and (3) carrying out cold press punching on the semi-finished part after cooling and shaping in the step (S3) to obtain the automobile bottom guard board.
7. The method for manufacturing an automotive underbody shield according to claim 6, wherein in S2, the specific operation of thermoforming is: and (3) placing the long fiber PET on a hot press forming die, wherein the die temperature is 100-150 ℃, the die pressure is 15-30Mpa, and the pressure maintaining time is 20-60s.
8. The method for manufacturing an automobile bottom guard board according to claim 6, wherein in S3, specific conditions for cooling and shaping are: the cooling time is 30-60s.
9. The method for manufacturing a bottom guard plate of an automobile according to claim 6, wherein in S4, the specific operation of cold press punching is: and (3) placing the cooled and shaped PET semi-finished part on a cold press punching die, starting a press, and finishing die assembly and waste punching.
10. The method for manufacturing an automobile bottom guard plate according to claim 9, wherein the conditions for punching the scraps are as follows: punching for 10-30s, wherein the punching pressure is 15-30Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311548136.1A CN117325779A (en) | 2023-11-20 | 2023-11-20 | Automobile bottom guard board and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311548136.1A CN117325779A (en) | 2023-11-20 | 2023-11-20 | Automobile bottom guard board and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117325779A true CN117325779A (en) | 2024-01-02 |
Family
ID=89277612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311548136.1A Pending CN117325779A (en) | 2023-11-20 | 2023-11-20 | Automobile bottom guard board and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117325779A (en) |
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2023
- 2023-11-20 CN CN202311548136.1A patent/CN117325779A/en active Pending
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