CN105033582A - Machining technology of breathable insert of moving die used for automobile door panel horn - Google Patents
Machining technology of breathable insert of moving die used for automobile door panel horn Download PDFInfo
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- CN105033582A CN105033582A CN201510449084.1A CN201510449084A CN105033582A CN 105033582 A CN105033582 A CN 105033582A CN 201510449084 A CN201510449084 A CN 201510449084A CN 105033582 A CN105033582 A CN 105033582A
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- Prior art keywords
- processing
- insert
- dynamic model
- polishing
- ventilative steel
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- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- 238000003754 machining Methods 0.000 title claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 48
- 238000005498 polishing Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000001746 injection moulding Methods 0.000 claims abstract description 9
- 238000013022 venting Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 51
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 30
- 238000005273 aeration Methods 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000009760 electrical discharge machining Methods 0.000 abstract 2
- 238000012805 post-processing Methods 0.000 abstract 1
- 238000007781 pre-processing Methods 0.000 abstract 1
- 239000000839 emulsion Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/007—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass injection moulding tools
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses machining technology of a breathable insert of a moving die used for an automobile door panel horn, pertaining to the field of dies. The machining technology comprises following steps: surface machining; carved electrical discharge machining; wire-cutting electrical-discharge machining; polishing machining; pre-processing and post-processing of leathers; cooling hole plugging processing; and oil-removing processing. The machining technology of the breathable insert of the moving die used for the automobile door panel horn has following beneficial effects: by means of the technology, the breathable insert of the moving die is machined; during an injection molding process, trapped air in the die can be discharged out of the die by means of the breathable insert of the moving die; compared with a conventional venting needle, surplus air can be discharged without applying pressure; due to great decrease in injection pressure, a product is easily formed so that product quality is improved significantly and the qualified rate of products is increased; and the technology and the breathable insert can be popularized to be applied to dies with trapped air so that great application value is obtained.
Description
Technical field
The present invention relates to mould applications, particularly a kind of automobile door plate loudspeaker dynamic model is breathed freely insert processing technology.
Background technology
Common automobile door plate loudspeaker injection mould structure, it is made shapingly to become very difficult because have horn cover shape, be embodied in: this door-plate injection mould distributes at loudspeaker position and much touches perforation, when injection moulding, plastics generally first fill surrounding, and then toward intermediate flow, cause the loudspeaker position air middle when injection moulding to get rid of, cannot injection moulding be completed.
Existing common practice arranges exhaust needle in the middle of the core rod of horn structure, simultaneously intensified pressure and the filling plastic at this position is full.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
After pressure increasing, the mold use life-span can be made relatively to reduce, product also can be made easily to occur Xiang Bai simultaneously, push up the scarce limits such as fat, horn cover centre is burnt, very unstable in production, the qualification rate of product is not high.
Summary of the invention
In order to solve the problem of prior art, embodiments providing a kind of automobile door plate loudspeaker dynamic model and to breathe freely insert processing technology.Described technical scheme is as follows:
Embodiments provide a kind of automobile door plate loudspeaker dynamic model to breathe freely insert processing technology, described automobile door plate loudspeaker dynamic model insert processing technology of breathing freely comprises the steps:
S101, Surface Machining;
Described S101 Surface Machining comprises the steps:
S1011, dynamic model breathe freely insert surface cut processing and grinding processing;
S1012, needing the surface of aeration carry out minute surface electric discharge processing and manual polishing;
Carry out by S107 step process of deoiling after S1013, process finishing;
After S1014, process of deoiling terminate, check that dynamic model is breathed freely insert aeration;
Check that dynamic model insert aeration of breathing freely specifically comprises:
Metal drips the organic solvent of acetone and so on;
From die venting hole air gun, air is sent to; If dynamic model is breathed freely, insert aeration well has a large amount of microbubble and goes out, and the air that dynamic model is breathed freely in insert is discharged from the exhaust space of mould;
S102, finishing impression electric discharge processing;
S103, Linear cut electric discharge processing;
S104, polishing;
Described S104 polishing comprises the steps:
After the ventilative steel of S1041, slotting cutter processing, polish with oilstone;
S1042, ventilative steel are the ventilative steel of 7 μm, 3 μm, all carry out polishing according to the order on polishing paper;
Polish again by the order of #1000-#1200 with Buddha's warrior attendant glue or the aluminium oxide sand paper that dissociates after polishing paper polishing, ventilative steel aeration can be made to reach best;
S105, dermatoglyph pre-process and post-process;
Described S105 dermatoglyph pre-process and post-process comprises the steps:
S1051, dermatoglyph treated side are ground to step S1042 according to S104 step, and aeration is now with reference to S108 step;
S1052, the oil of breathing freely just with reference to the removal of S107 step;
S1053, dermatoglyph treated side brush are coated with fluid resin; Be coated with again once after putting 10 minutes; Operation repetition 2 to 3 times;
The time of a whole night is placed under S1054, normal temperature;
S1055, for make fluid resin coated face can with brush concavo-convex removing, with acetone, surface resin is removed fast;
S1056, etch processes;
S1057: carry out ultrasonic washer according to the step S1072 in S107, S1073 after etch processes is complete;
S106, Cooling Holes are blocked up process;
The process of blocking up of described S106 Cooling Holes comprises the steps:
S1061, with drilling machine processing beat Cooling Holes;
S1062, screw thread at Cooling Holes porch process water joint;
After S1063, ventilative firm processing all terminate, carry out oil removing according to S107 step;
Screw hole blocked by S1064, Cooling Holes one end latch;
S1065, in ventilative steel Cooling Holes, inject fluid resin, place 10 minutes;
The resin that S1066, placement remained in tap after 10 minutes;
Repeat step S1065 and S1066;
Time a whole night is placed under S1067, normal temperature;
S107, oil removal treatment;
Described S107 oil removal treatment comprises the steps:
After S1071, ventilative steel processing all terminate, put into drying machine; According to ventilative steel size and soil level different, minimum 150 degree of placements 2 hours;
S1072, drying machine are cooled to room temperature after taking out, and put into supersonic wave cleaning machine; Acetone plate put into by ventilative steel; Until acetone no longer variable color, usual 30 minutes once, repeat 2-3 time;
After S1073, ultrasonic wave cleaning, then put into drying machine drying; 150 degree of placements 2 hours;
Can select simple cleaning method S108, described S108 comprises the steps:
S1081, begin to rehearse at die space place pore; Begin to rehearse in forming operation side before mould put into by ventilative steel pore;
In S1082, injection moulding and steel process, ventilative steel is as blocked by plastic raw materials, grease etc., at the solvent that ventilative steel surface sprinkling can be dissolved; Generally use acetone;
S1083, from steam vent injecting compressed air, blow solvent open, with cloth, the solvent bubbled is wiped only; Solvent become colorless transparent before repeat step S1082, S1083.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Go out dynamic model by this processes to breathe freely insert, tired gas in injection moulding process in mould can be discharged outside mould by dynamic model insert of breathing freely, just can realize the discharge of additional air without the need to applying pressure than original exhaust needle, injection pressure declines a lot, the shaping of product becomes more easy, significantly improve product quality, improve product percent of pass; This technique and ventilative insert can also promote the use of other to be had in the mould of tired gas, has higher using value.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that automobile door plate loudspeaker dynamic model that the embodiment of the present invention provides is breathed freely the process chart of insert processing technology.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment
Embodiments provide a kind of automobile door plate loudspeaker dynamic model to breathe freely insert processing technology, this dynamic model is breathed freely insert processing technology, is mainly used in the exhaust that injection mold is stranded gas position, is used in particular for the exhaust that automobile door plate loudspeaker are stranded gas position.
This automobile door plate loudspeaker dynamic model insert processing technology of breathing freely comprises the steps:
S101, Surface Machining.
Particularly, Surface Machining comprises the steps:
S1011, surface cut processing and grinding processing.
S1012, needing the surface of aeration carry out minute surface electric discharge processing and manual polishing.
Wherein, the processing capacity on surface is 10 microns, is not only product surface, and electric discharge processing and manual polishing all will be carried out in all ventilative faces.The correct words of the product cutting processing conditions of 20 μm just do not need electric discharge processing.
Carry out by S107 step process of deoiling after S1013, process finishing.
After S1014, process of deoiling terminate, check that dynamic model is breathed freely insert aeration.
Particularly, check that dynamic model insert aeration of breathing freely specifically comprises:
Metal drips the organic solvent of acetone and so on;
From die venting hole air gun, air is sent to; If dynamic model is breathed freely, insert aeration well has a large amount of microbubble and goes out, and the air that dynamic model is breathed freely in insert is discharged from the exhaust space of mould.
S102, finishing impression electric discharge processing.
This step processing method is the same with the method for processing common iron in prior art.Because ventilative steel viscosity is bad, the method gradually reduced by processing electric current and process velocity is carried out.
Preferably, as needed thinner polished surface, preparing fine finishining electrode in addition, being undertaken by the processing technology of surface roughness less than 20 μm, better aeration can be had.
S103, Linear cut electric discharge processing.
Particularly, the cutting of emulsion discharge lines is adopted.Because emulsion discharge lines is more easily got rusty, need be placed on inside alcohol equal solvent dry rapidly.
Preferably, oil electric discharge processing can be used.If desired, emulsion discharge lines is the line of below 0.2um, and now, the Linear cut velocity of discharge is common more than 1.5 times.
Wherein, because ventilative steel is loose structure, there is the danger of broken string, need prepare early.
S104, polishing.
Particularly, polishing comprises the steps:
After the ventilative steel of S1041, slotting cutter processing, polish with oilstone.
Now, abradant surface aeration is inadequate.
S1042, ventilative steel are the ventilative steel of 7 μm, 3 μm, all carry out polishing according to the order on polishing paper.
The ventilative steel aeration that this step is processed than discharging almost.
The ventilative steel #800 aeration of 20 μm can be satisfied the demand.
Preferably, polish again by the order of #1000-#1200 with Buddha's warrior attendant glue or the aluminium oxide sand paper that dissociates after polishing paper polishing, ventilative steel aeration can be made to reach best.
This step caution of operation point:
1, not too firmly two-way polishing during polishing paper polishing.
2, use Buddha's warrior attendant glue or aluminium oxide dissociate sand paper time, must with the glue of more than 10 μm or the grains of sand.
3, after grinding, shown in S107 step, oil content is removed.
S105, dermatoglyph pre-process and post-process.
Particularly, dermatoglyph pre-process and post-process comprises the steps:
S1051, dermatoglyph treated side are ground to step S1042 according to S104 step, and aeration is now with reference to S108 step.
S1052, the oil of breathing freely just with reference to the removal of S107 step.
S1053, dermatoglyph treated side brush are coated with fluid resin.Be coated with again once after putting 10 minutes.Such operation repeats 2 to 3 times.
The time of a whole night is placed under S1054, normal temperature.
S1055, for make fluid resin coated face can with brush concavo-convex removing, with acetone, surface resin is removed fast.
S1056, etch processes.
S1057: carry out ultrasonic washer according to the step S1072 in S107, S1073 after etch processes is complete.
S106, Cooling Holes are blocked up process.
Particularly, Cooling Holes process of blocking up comprises the steps:
S1061, with drilling machine processing beat Cooling Holes.
S1062, screw thread at Cooling Holes porch process water joint.
After S1063, ventilative firm processing all terminate, carry out oil removing according to S107 step.
Screw hole blocked by S1064, Cooling Holes one end latch.
S1065, in ventilative steel Cooling Holes, inject fluid resin, place 10 minutes.Resin soaks into 5mm in 10 minutes.
The resin that S1066, placement remained in tap after 10 minutes.
Repeat step S1065 and S1066.
Time a whole night is placed under S1067, normal temperature.
Be 50 positive and negative 10 degree with drying machine design temperature, and keep 3 hours.
This step caution of operation point:
1, cooling water is set as 6 ㎏/㎝.
2, after resin impregnated, latch takes off immediately.
S107, oil removal treatment.
Particularly, oil removal treatment comprises the steps:
After S1071, ventilative steel processing all terminate, put into drying machine.According to ventilative steel size and soil level different, minimum 150 degree of placements 2 hours.
S1072, drying machine are cooled to room temperature after taking out, and put into supersonic wave cleaning machine.Acetone plate put into by ventilative steel.Until acetone no longer variable color, usual 30 minutes once, repeat 2-3 time.
After S1073, ultrasonic wave cleaning, then put into drying machine drying.150 degree of placements 2 hours.
Preferably, can select simple cleaning method S108, step is as follows:
S1081: begin to rehearse at die space place pore.Begin to rehearse in forming operation side before mould put into by ventilative steel pore.Steam vent fills gas joint more convenient.
S1082: in injection moulding and steel process, ventilative steel is blocked, at the solvent that ventilative steel surface sprinkling can be dissolved by plastic raw materials (resin), grease etc.Generally use acetone.
S1083: from steam vent injecting compressed air, blow solvent open, wipes the solvent bubbled with cloth only.Solvent become colorless transparent before repeat step S1082, S1083.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Go out dynamic model by this processes to breathe freely insert, tired gas in injection moulding process in mould can be discharged outside mould by dynamic model insert of breathing freely, just can realize the discharge of additional air without the need to applying pressure than original exhaust needle, injection pressure declines a lot, the shaping of product becomes more easy, significantly improve product quality, improve product percent of pass; This technique and ventilative insert can also promote the use of other to be had in the mould of tired gas, has higher using value.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. automobile door plate loudspeaker dynamic model is breathed freely an insert processing technology, it is characterized in that,
Described automobile door plate loudspeaker dynamic model insert processing technology of breathing freely comprises the steps:
S101, Surface Machining;
Described S101 Surface Machining comprises the steps:
S1011, dynamic model breathe freely insert surface cut processing and grinding processing;
S1012, needing the surface of aeration carry out minute surface electric discharge processing and manual polishing;
Carry out by S107 step process of deoiling after S1013, process finishing;
After S1014, process of deoiling terminate, check that dynamic model is breathed freely insert aeration;
Check that dynamic model insert aeration of breathing freely specifically comprises:
Metal drips the organic solvent of acetone and so on;
From die venting hole air gun, air is sent to; If dynamic model is breathed freely, insert aeration well has a large amount of microbubble and goes out, and the air that dynamic model is breathed freely in insert is discharged from the exhaust space of mould;
S102, finishing impression electric discharge processing;
S103, Linear cut electric discharge processing;
S104, polishing;
Described S104 polishing comprises the steps:
After the ventilative steel of S1041, slotting cutter processing, polish with oilstone;
S1042, ventilative steel are the ventilative steel of 7 μm, 3 μm, all carry out polishing according to the order on polishing paper;
Polish again by the order of #1000-#1200 with Buddha's warrior attendant glue or the aluminium oxide sand paper that dissociates after polishing paper polishing, ventilative steel aeration can be made to reach best;
S105, dermatoglyph pre-process and post-process;
Described S105 dermatoglyph pre-process and post-process comprises the steps:
S1051, dermatoglyph treated side are ground to S1042 step according to S104 step, and aeration is now with reference to S108 step;
S1052, the oil of breathing freely just with reference to the removal of S107 step;
S1053, dermatoglyph treated side brush are coated with fluid resin; Be coated with again once after putting 10 minutes; Operation repetition 2 to 3 times;
The time of a whole night is placed under S1054, normal temperature;
S1055, for make fluid resin coated face can with brush concavo-convex removing, with acetone, surface resin is removed fast;
S1056, etch processes;
S1057: carry out ultrasonic washer according to the step S1072 in S107, S1073 after etch processes is complete;
S106, Cooling Holes are blocked up process;
The process of blocking up of described S106 Cooling Holes comprises the steps:
S1061, with drilling machine processing beat Cooling Holes;
S1062, screw thread at Cooling Holes porch process water joint;
After S1063, ventilative firm processing all terminate, carry out oil removing according to S107 step;
Screw hole blocked by S1064, Cooling Holes one end latch;
S1065, in ventilative steel Cooling Holes, inject fluid resin, place 10 minutes;
The resin that S1066, placement remained in tap after 10 minutes;
Repeat step S1065 and S1066;
Time a whole night is placed under S1067, normal temperature;
S107, oil removal treatment;
Described S107 oil removal treatment comprises the steps:
After S1071, ventilative steel processing all terminate, put into drying machine; According to ventilative steel size and soil level different, minimum 150 degree of placements 2 hours;
S1072, drying machine are cooled to room temperature after taking out, and put into supersonic wave cleaning machine; Acetone plate put into by ventilative steel; Until acetone no longer variable color, usual 30 minutes once, repeat 2-3 time;
After S1073, ultrasonic wave cleaning, then put into drying machine drying; 150 degree of placements 2 hours;
Can select simple cleaning method S108, described S108 comprises the steps:
S1081, begin to rehearse at die space place pore; Begin to rehearse in forming operation side before mould put into by ventilative steel pore;
In S1082, injection moulding and steel process, ventilative steel is as blocked by plastic raw materials, grease etc., at the solvent that ventilative steel surface sprinkling can be dissolved; Generally use acetone;
S1083, from steam vent injecting compressed air, blow solvent open, with cloth, the solvent bubbled is wiped only; Solvent become colorless transparent before repeat step S1082, S1083.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510449084.1A CN105033582B (en) | 2015-07-28 | 2015-07-28 | The automobile door plate loudspeaker ventilative insert processing technology of dynamic model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510449084.1A CN105033582B (en) | 2015-07-28 | 2015-07-28 | The automobile door plate loudspeaker ventilative insert processing technology of dynamic model |
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| CN105033582A true CN105033582A (en) | 2015-11-11 |
| CN105033582B CN105033582B (en) | 2017-11-07 |
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| CN201510449084.1A Expired - Fee Related CN105033582B (en) | 2015-07-28 | 2015-07-28 | The automobile door plate loudspeaker ventilative insert processing technology of dynamic model |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106345914A (en) * | 2016-08-30 | 2017-01-25 | 天津市津兆机电开发有限公司 | Structure of insert and manufacturing method |
| CN108015630A (en) * | 2016-10-28 | 2018-05-11 | 上海赛科利汽车模具技术应用有限公司 | A kind of polishing method of auto parts mould |
| CN110171081A (en) * | 2019-05-16 | 2019-08-27 | 宁海县大雅精密机械有限公司 | A method of epidermis decoration of the molding with dermatoglyph |
| CN111098099A (en) * | 2020-01-07 | 2020-05-05 | 天津银宝山新科技有限公司 | Door plate front and rear die processing technology |
| CN114770059A (en) * | 2022-03-31 | 2022-07-22 | 上汽通用五菱汽车股份有限公司 | Manufacturing process of mold with horn meshes |
| CN115091122A (en) * | 2022-05-31 | 2022-09-23 | 东莞涌韵音膜有限公司 | Production process of L-shaped plastic support sound film |
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| CN110171081A (en) * | 2019-05-16 | 2019-08-27 | 宁海县大雅精密机械有限公司 | A method of epidermis decoration of the molding with dermatoglyph |
| CN111098099A (en) * | 2020-01-07 | 2020-05-05 | 天津银宝山新科技有限公司 | Door plate front and rear die processing technology |
| CN114770059A (en) * | 2022-03-31 | 2022-07-22 | 上汽通用五菱汽车股份有限公司 | Manufacturing process of mold with horn meshes |
| CN115091122A (en) * | 2022-05-31 | 2022-09-23 | 东莞涌韵音膜有限公司 | Production process of L-shaped plastic support sound film |
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