CN117733486A - Processing method of integrated door ring - Google Patents
Processing method of integrated door ring Download PDFInfo
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- CN117733486A CN117733486A CN202311810847.1A CN202311810847A CN117733486A CN 117733486 A CN117733486 A CN 117733486A CN 202311810847 A CN202311810847 A CN 202311810847A CN 117733486 A CN117733486 A CN 117733486A
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- 238000003672 processing method Methods 0.000 title claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 62
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 20
- 230000032683 aging Effects 0.000 claims abstract description 12
- 239000011265 semifinished product Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000003303 reheating Methods 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
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Abstract
The invention relates to the technical field of automobile part manufacturing, and discloses a processing method of an integrated door ring, which comprises the following steps: firstly, selecting an aluminum alloy section for blanking to obtain an A column blanking plate, an upper edge beam blanking plate, a B column blanking plate, a threshold blanking plate, a first patch blanking plate and a second patch blanking plate; step two, welding the column A blanking plate, the upper edge beam blanking plate, the column B blanking plate and the threshold blanking plate into door ring plates; step three, connecting the first patch blanking plate and the second patch blanking plate to a door ring plate material to obtain a door ring blank; step four, heating the door ring blank obtained in the step three; step five, conveying the door ring blank to hot stamping equipment for hot stamping and shaping to obtain a door ring semi-finished product; step six, aging treatment is carried out on the door ring semi-finished product to obtain a door ring; the processing method of the integrated door ring is used for producing the door ring which meets the light weight requirement and simultaneously meets the strength requirement.
Description
Technical Field
The invention relates to the technical field of automobile part manufacturing, in particular to a processing method of an integrated door ring.
Background
The integrated door ring in the prior art adopts a processing method that high-strength steel is directly punched and formed into a door ring plate, and then spot welding patch blanking plates are welded on the door ring plate; the processing method adopts steel, the door ring has heavy weight and insufficient light weight.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a processing method of an integrated door ring, which is used for producing the door ring meeting the light weight requirement and simultaneously meeting the strength requirement.
In order to achieve the above purpose, the invention provides a processing method of an integrated door ring, comprising the following steps:
firstly, selecting an aluminum alloy section for blanking to obtain blanking plates of all parts of a door ring, wherein the blanking plates comprise an A column blanking plate, a top edge beam blanking plate, a B column blanking plate, a threshold blanking plate, a first patch blanking plate and a second patch blanking plate;
step two, welding the column A blanking plate, the upper edge beam blanking plate, the column B blanking plate and the threshold blanking plate obtained in the step one into door ring plates;
step three, connecting the first patch blanking plate and the second patch blanking plate to an A column blanking plate and a B column blanking plate of the door ring plate respectively through friction stir spot welding to obtain a door ring blank;
step four, heating the door ring blank obtained in the step three;
step five, conveying the heated door ring blank to hot stamping equipment for hot stamping, and shaping after hot stamping to obtain a door ring semi-finished product;
and step six, performing aging treatment on the door ring semi-finished product, and obtaining the door ring after finishing, wherein the temperature of the aging treatment is 400-700 ℃, and the time of the aging treatment is 0.5-3 h.
In some embodiments, the a-pillar blanking plate has a thickness of between 2.4mm and 3.6mm, the B-pillar blanking plate has a thickness of between 2.4mm and 3.6mm, the roof rail blanking plate has a thickness of between 1.8mm and 3mm, and the threshold blanking plate has a thickness of between 1.8mm and 3mm.
In some embodiments, in said step three, said friction stir spot welding has a weld depth of between 0.6mm and 1.2 mm.
In some embodiments, the first patch blanking plate has a thickness of 1.5mm to 3.6mm.
In some embodiments, the second patch blanking plate has a thickness of 1.2mm to 3mm.
In some embodiments, in the first step, the aluminum alloy profile is a 6-series aluminum alloy profile or a 7-series aluminum alloy profile.
In some embodiments, in the third step, the number of welds of the first patch blanking plate is 6-12, and the number of welds of the second patch blanking plate is 6-12.
In some embodiments, in the step one, further comprising obtaining a third patch blanking plate; in the third step, the method further comprises the step of connecting the third patch blanking plate to the door ring plate through friction stir spot welding, wherein one end of the third patch blanking plate is connected to the B-pillar blanking plate, and the other end of the third patch blanking plate is connected to the threshold blanking plate.
In some embodiments, in the third step, the number of welds of the third patch blanking plate is 6-12.
In some embodiments, the second patch blanking plate has a thickness of 1.2mm to 3mm.
Compared with the prior art, the processing method of the integrated door ring has the beneficial effects that: (1) In the second step, the A column blanking plate, the upper side beam blanking plate, the B column blanking plate and the threshold blanking plate are sequentially connected into door ring plates in a splice welding mode, and in the third step, the first patch blanking plate and the second patch blanking plate are welded to the A column blanking plate and the B column blanking plate respectively in a friction stir spot welding mode.
(2) Because the welding performance of the aluminum alloy section is relatively poor compared with that of the traditional steel material, the patch blanking plate is welded to the door ring plate by adopting the common aluminum spot welding, the welding strength of the common aluminum spot welding is about 60 percent of that of a base material, and the welding strength is poor, so that the strength requirement of the patch blanking plate and the door ring plate for integral stamping forming cannot be met, the processing mode of 'first welding reheat stamping' cannot be realized by adopting the connecting mode of the common aluminum spot welding, and the processing method of the integral door ring provided by the invention can weld the patch blanking plate to the door ring plate by adopting the connecting mode of the friction stir spot welding, and the welding strength of the friction stir spot welding can reach more than 80 percent of that of the base material and even is basically equivalent to that of the base material, thereby meeting the strength requirement of the patch blanking plate and the door ring plate for integral stamping forming and realizing the processing mode of 'first reheat stamping'; meanwhile, the processing mode of spot welding reheating stamping is adopted, and the loss of the connection strength of the connection position of the patch blanking plate and the door ring plate caused by welding can be compensated through the hot stamping in the fifth step, so that the connection strength of the connection position of the patch blanking plate and the door ring plate can be enhanced.
(3) By adopting the aging treatment in the step six, the internal performance of the door ring semi-finished product can be improved, so that the door ring can reach the preset target performance.
(4) By limiting the welding depth of the friction stir spot welding to 0.6mm to 1.2mm, it is possible to ensure that the welding strength of the friction stir spot welding reaches 80% or more of the base material.
(5) The strength of the B column blanking plate and the threshold blanking plate can be improved by adopting the third patch blanking plate, and the connection strength of the B column blanking plate and the threshold zone blanking plate can be enhanced.
Drawings
Fig. 1 is a schematic flow chart of a processing method of an integrated door ring according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a door ring plate obtained in the second step according to the embodiment of the present invention;
fig. 3 is a schematic structural view of a door ring blank obtained in step three according to the embodiment of the present invention.
In the figure, a column A blanking plate; 2. a roof side rail blanking plate; 3. b column blanking plate; 31. a first B column blanking plate; 32. a second B column blanking plate; 4. a threshold blanking plate; 41. a first threshold blanking plate; 42. a second threshold blanking plate; 5. a first patch blanking plate; 6. a second patch blanking plate; 7. a third patch blanking plate; 8. welding seams;
10. door ring plate material; 20. door ring blank.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Referring to fig. 1-3, a method for processing an integrated door ring according to an embodiment of the present invention includes the following steps:
firstly, selecting an aluminum alloy profile for blanking to obtain blanking plates of all parts of a door ring, wherein the blanking plates comprise an A column blanking plate 1, a top edge beam blanking plate 2, a B column blanking plate 3, a threshold blanking plate 4, a first patch blanking plate 5 and a second patch blanking plate 6;
step two, welding the column A blanking plate 1, the upper edge beam blanking plate 2, the column B blanking plate 3 and the threshold blanking plate 4 obtained in the step one into a door ring plate 10;
step three, connecting the first patch blanking plate 5 and the second patch blanking plate 6 to the A column blanking plate 1 and the B column blanking plate 3 of the door ring plate 10 respectively through friction stir spot welding to obtain a door ring blank 20;
step four, heating the door ring blank 20 obtained in the step three;
step five, conveying the heated door ring blank 20 to hot stamping equipment for hot stamping, and shaping after hot stamping to obtain a door ring semi-finished product;
and step six, performing aging treatment on the door ring semi-finished product, and obtaining the door ring after finishing, wherein the aging treatment temperature is 400-700 ℃ and the aging treatment time is 0.5-3 h.
According to the processing method of the integrated door ring, in the second step, the A column blanking plate 1, the upper side beam blanking plate 2, the B column blanking plate 3 and the threshold blanking plate 4 are sequentially connected into the door ring plate 10 in a splice welding mode, in the third step, the first patch blanking plate 5 and the second patch blanking plate 6 are respectively welded to the A column blanking plate 1 and the B column blanking plate 3 by adopting friction stir spot welding, so that in the first step, according to the strength requirements of all parts of the door ring, aluminum alloy sections with various thicknesses are adopted for blanking respectively to obtain the A column blanking plate 1, the upper side beam blanking plate 2, the B column blanking plate 3, the threshold blanking plate 4, the first patch blanking plate 5 and the second patch blanking plate 6, so that key areas of the door ring have thicker thicknesses, key areas of the door ring have thinner thicknesses, the key areas of the door ring are reduced, and meanwhile, the weight of the aluminum alloy sections is lighter than that of steel materials is required to maintain the same strength, and the whole weight of the door ring is further reduced; in summary, the processing method of the integrated door ring provided by the invention can be used for producing the door ring which meets the light weight requirement and simultaneously meets the strength requirement.
Compared with the existing steel integrated door ring obtained by adopting a thermoforming laser welding processing mode, the aluminum alloy profile integrated door ring obtained by adopting the processing method of the integrated door ring provided by the invention can reduce the weight by more than 40%.
Compared with the existing mode that an aluminum alloy blank is directly punched to form a door ring, and then a patch plate is spot-welded on the door ring, the aluminum alloy section integrated door ring obtained by the processing method of the integrated door ring can reduce the weight by more than 10%, reduce the cost investment of a process and a tool, lower the cost and improve the material utilization rate by more than 30%.
Because the welding performance of the aluminum alloy section is relatively poor compared with that of the traditional steel material, the patch blanking plate is welded to the door ring plate 10 by adopting the common aluminum spot welding, the welding strength of the common aluminum spot welding is about 60 percent of that of a base metal, and the welding strength is poor, so that the strength requirement of the patch blanking plate and the door ring plate 10 for integral stamping forming cannot be met, the processing mode of 'first welding and reheating stamping' cannot be realized by adopting the connecting mode of the common aluminum spot welding, and the processing mode of the integral door ring provided by the invention can be used for welding the patch blanking plate to the door ring plate 10 by adopting the connecting mode of the friction stir spot welding, and the welding strength of the friction stir spot welding can reach more than 80 percent of that of the base metal and even is basically equivalent to that of the base metal, so that the strength requirement of the patch blanking plate and the door ring plate for integral stamping forming can be met, and the processing mode of 'first spot welding and reheating stamping' can be realized; meanwhile, the processing mode of spot welding reheating stamping is adopted, and the loss of the connection strength generated by welding at the connection position of the patch blanking plate and the door ring plate 10 can be compensated through the hot stamping in the step five, so that the connection strength at the connection position of the patch blanking plate and the door ring plate is enhanced.
The friction stir spot welding has the advantages of no welding spatter and smoke dust and good environmental protection.
By adopting aging treatment in the step six, the internal performance and the external performance of the door ring semi-finished product can be improved, so that the finally obtained door ring product can reach the preset target performance, and meanwhile, the external performance of the door ring semi-finished product can be improved, so that the finally obtained door ring product has the advantages of excellent process, electrophoresis free and corrosion resistance.
The thickness of the column A blanking plate 1 is between 2.4mm and 3.6mm, the thickness of the column B blanking plate 3 is between 2.4mm and 3.6mm, the thickness of the upper side beam blanking plate 2 is between 1.8mm and 3mm, and the thickness of the threshold blanking plate 4 is between 1.8mm and 3mm.
In some embodiments, the thickness of the a-pillar blanking plate 1 may be 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, etc. any number between 2.4mm-3.6mm is satisfied, and is not limited herein.
In some embodiments, the thickness of the roof side rail blanking plate 2 may be 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc. any number between 1.8mm-3mm is satisfied, and is not limited herein.
In some embodiments, the thickness of the B-pillar blanking panel 3 may be 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, etc. any number between 2.4mm-3.6mm is satisfied, without limitation herein.
In the third step, the welding depth of the friction stir spot welding is between 0.6mm and 1.2 mm. By limiting the welding depth of the friction stir spot welding to 0.6mm to 1.2mm, it is possible to ensure that the welding strength of the friction stir spot welding reaches 80% or more of the base material.
In some embodiments, the weld depth of friction stir spot welds may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, etc. any number between 0.6m-1.2mm is satisfied.
The thickness of the first patch blanking plate 5 is 1.5mm-3.6mm.
In some embodiments, the thickness of the first patch blanking panel 5 may be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, etc. any number between 2.4mm-3.6mm is satisfied, without limitation herein.
The thickness of the second patch blanking plate 6 is 1.2mm-3mm.
In some embodiments, the thickness of the second patch blanking panel 6 may be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc. any number between 2.4mm-3.6mm is satisfied, without limitation herein.
Optionally, in the first step, the aluminum alloy profile is a 6-series aluminum alloy profile or a 7-series aluminum alloy profile.
Optionally, in the third step, the number of welds 8 of the first patch blanking plate 5 is 6-12.
In this embodiment, the number of welds 8 of the first patch blanking plate 5 is 10.
Optionally, the number of welds 8 of the second patch blanking plate 6 is 6-12.
In this embodiment, the number of welds 8 of the second patch blanking plate 6 is 10.
In some embodiments, in step one, further comprising obtaining a third patch blanking plate 7; in the third step, the third patch blanking plate 7 is connected to the door ring plate 10 through friction stir spot welding, one end of the third patch blanking plate 7 is connected to the B-pillar blanking plate 3, and the other end is connected to the threshold blanking plate 4. The adoption of the third patch blanking plate 7 can not only improve the strength of the B-pillar blanking plate 3 and the threshold blanking plate 4, but also strengthen the connection strength of the B-pillar blanking plate 3 and the threshold blanking plate 4, and simultaneously can also improve the integral consistency of the door ring blank 20, thereby being beneficial to improving the integral strength of the door ring blank 20 and being beneficial to forming the door ring blank 20 into a door ring semi-finished product in the hot stamping of the step five.
In the third step, the number of welding seams 8 of the third patch blanking plate 7 is 6-12.
In this embodiment, the number of welds 8 of the third patch blanking plate 7 is 10.
The thickness of the third patch blanking plate 7 is 1.2mm-3mm.
In some embodiments, the thickness of the third patch blanking panel 7 may be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc. any number between 2.4mm and 3.6mm is satisfied, without limitation herein.
Referring to fig. 2, the door ring plate 10 obtained in the second step includes an a-pillar blanking plate 1, an upper edge beam blanking plate 2, a B-pillar blanking plate 3 and a threshold blanking plate 4 which are sequentially connected.
The B-pillar blanking plate 3 includes a first B-pillar blanking plate 31 and a second B-pillar blanking plate 32 connected to one end of the first B-pillar blanking plate, one end of the first B-pillar blanking plate 31, which is far away from the second B-pillar blanking plate 32, is connected to the roof side rail blanking plate 2, and one end of the second B-pillar blanking plate 32, which is far away from the first B-pillar blanking plate 31, is connected to the threshold blanking plate 4.
The threshold blanking plate 4 includes a first threshold blanking plate 41, and a second threshold blanking plate 42 connected to one end of the first threshold blanking plate 41, wherein one end of the first threshold blanking plate 41 away from the second threshold blanking plate 42 is connected to the a-pillar blanking plate, and one end of the second threshold blanking plate 42 away from the first threshold blanking plate 41 is connected to the B-pillar blanking plate 3.
Referring to fig. 3, the door ring blank 20 obtained in the third step includes an a-pillar blanking plate 1, an upper edge beam blanking plate 2, a B-pillar blanking plate 3, a threshold blanking plate 4, a first patch blanking plate 5, and a second patch blanking plate 6, where the a-pillar blanking plate 1, the upper edge beam blanking plate 2, the B-pillar blanking plate 3, and the threshold blanking plate 4 are sequentially connected, the first patch blanking plate 5 is connected to the a-pillar blanking plate through friction stir spot welding, the second patch blanking plate 6 is connected to the B-pillar blanking plate through friction stir spot welding, and the third patch blanking plate 7 is connected to the B-pillar blanking plate 3 and the threshold blanking plate 4 through friction stir spot welding.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (10)
1. The processing method of the integrated door ring is characterized by comprising the following steps of:
firstly, selecting an aluminum alloy section for blanking to obtain blanking plates of all parts of a door ring, wherein the blanking plates comprise an A column blanking plate, a top edge beam blanking plate, a B column blanking plate, a threshold blanking plate, a first patch blanking plate and a second patch blanking plate;
step two, welding the column A blanking plate, the upper edge beam blanking plate, the column B blanking plate and the threshold blanking plate obtained in the step one into door ring plates;
step three, connecting the first patch blanking plate and the second patch blanking plate to an A column blanking plate and a B column blanking plate of the door ring plate respectively through friction stir spot welding to obtain a door ring blank;
step four, heating the door ring blank obtained in the step three;
step five, conveying the heated door ring blank to hot stamping equipment for hot stamping, and shaping after hot stamping to obtain a door ring semi-finished product;
and step six, performing aging treatment on the door ring semi-finished product, and obtaining the door ring after finishing, wherein the temperature of the aging treatment is 400-700 ℃, and the time of the aging treatment is 0.5-3 h.
2. The method of claim 1, wherein the a-pillar blanking plate has a thickness of 2.4mm-3.6mm, the B-pillar blanking plate has a thickness of 2.4mm-3.6mm, the roof rail blanking plate has a thickness of 1.8mm-3mm, and the threshold blanking plate has a thickness of 1.8mm-3 mm.
3. The method of manufacturing an integrated door ring according to claim 2, wherein in the third step, the friction stir spot welding has a welding depth of between 0.6mm and 1.2 mm.
4. The method of claim 1, wherein the first patch blanking plate has a thickness of 1.5mm to 3.6mm.
5. The method of claim 1, wherein the second patch blanking plate has a thickness of 1.2mm to 3mm.
6. The method of claim 1, wherein in the first step, the aluminum alloy profile is a 6-series aluminum alloy profile or a 7-series aluminum alloy profile.
7. The method of claim 1, wherein in the third step, the number of welds of the first patch blanking plate is 6-12, and the number of welds of the second patch blanking plate is 6-12.
8. The method for manufacturing an integrated door ring according to claim 1, wherein,
in the first step, a third patch blanking plate is further obtained; in the third step, the third patch blanking plate is connected to the door ring plate through friction stir spot welding, one end of the third patch blanking plate is connected to the B column blanking plate, and the other end of the third patch blanking plate is connected to the threshold blanking plate.
9. The method of claim 8, wherein in the third step, the number of welds of the third patch blanking plate is 6-12.
10. The method of claim 8, wherein the third patch blanking plate has a thickness of 1.2mm-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311810847.1A CN117733486A (en) | 2023-12-26 | 2023-12-26 | Processing method of integrated door ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311810847.1A CN117733486A (en) | 2023-12-26 | 2023-12-26 | Processing method of integrated door ring |
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| CN117733486A true CN117733486A (en) | 2024-03-22 |
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| CN202311810847.1A Pending CN117733486A (en) | 2023-12-26 | 2023-12-26 | Processing method of integrated door ring |
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| CN (1) | CN117733486A (en) |
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- 2023-12-26 CN CN202311810847.1A patent/CN117733486A/en active Pending
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