CN111069608A - Earphone net production process - Google Patents
Earphone net production process Download PDFInfo
- Publication number
- CN111069608A CN111069608A CN201911358390.9A CN201911358390A CN111069608A CN 111069608 A CN111069608 A CN 111069608A CN 201911358390 A CN201911358390 A CN 201911358390A CN 111069608 A CN111069608 A CN 111069608A
- Authority
- CN
- China
- Prior art keywords
- net
- earphone
- degreasing
- sintering
- workpiece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a production process of a headphone net, which sequentially comprises the following steps: feeding, injection molding, degreasing, sintering, shaping, rough polishing, fine polishing, PVD (physical vapor deposition) plating, material taking and the like, and finally the production of the tin net is finished. Compared with the prior art, the invention has the advantages of high productivity, high production precision and the like.
Description
Technical Field
The invention belongs to the technical field of earphone net production, and particularly relates to an earphone net production process.
Background
More and more complicated of design of the earphone net on the current cell-phone, whole narrow length, the mesh is tiny and many, the product requires the precision height, in order to prevent that the product from warping there is very high intensity requirement in addition, belong to consumer electronics accessory, current demand is bigger, if make the earphone net of this kind of structure complicacy with plastics, intensity fragile inadequately, consequently, the earphone net adopts the metal material when producing more, with traditional PM, die-casting can't reach the performance requirement, with five gold technology such as CNC, the one-tenth high in production cost, the productivity is low, the process is numerous and the processing difficulty.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the production process of the earphone net, which has high productivity and high precision.
In order to solve the technical problems, the invention adopts the following technical scheme:
a production process of an earphone net comprises the following steps:
s1, feeding: putting metal material powder for producing the tin screen into a granulator for granulation to obtain granular feed for injection, wherein the rotating speed range of the granulator is 20 r/min to 30r/min, the granulation temperature range of the granulator is 180 ℃ to 200 ℃, and the mixing time range is 2H to 4H;
s2, injection molding: placing the granular feed in the step S1 into an injection mould in an injection machine, and injecting a blank by using the injection machine to obtain a tin net workpiece;
s3, degreasing: placing the earphone net workpiece into a degreasing furnace cavity, introducing nitric acid into the degreasing furnace cavity for degreasing, wherein the temperature range in the degreasing furnace cavity is 115-125 ℃, the mass range of the introduced nitric acid is 3-4.5 g/min, and the degreasing time is 3.5H;
s4, sintering: placing the degreased earphone net workpiece into a sintering furnace for sintering, wherein the sintering temperature is 850-1285 ℃;
s5, shaping: correcting the receiver net workpiece deformed after sintering;
s6, rough polishing: roughly polishing the shaped earphone net workpiece by using an abrasive cloth wheel;
s7, fine polishing: finely polishing the coarsely polished earphone net workpiece by using a flannelette wheel;
s8, PVD treatment plating: putting the precisely polished earphone net work piece into a PVD coating machine for PVD treatment and coating;
s9, taking materials: and taking out the earphone net workpiece subjected to PVD treatment plating from the PVD coating machine.
The temperature in the degreasing furnace cavity in the step S3 is 120 ℃.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) the metal material powder for producing the tin net is put into a granulator for granulation, is subjected to injection molding by an injection machine, and finally is subjected to degreasing, sintering, shaping and other steps to obtain a tin net workpiece, so that compared with the prior art, the production capacity is high, and the production precision is high;
(2) the headphone net belongs to a structural appearance piece, and has higher requirement on appearance, when the headphone net is produced, the headphone net with various colors meeting the requirement is finally obtained through the steps of rough polishing, fine polishing, PVD (physical vapor deposition) treatment plating and the like, and the appearance requirement of a consumer on the headphone net is met;
in conclusion, the invention has the advantages of high productivity, high precision and the like.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to a production process of a headphone net, which comprises the following steps:
s1, feeding: putting metal material powder for producing the tin screen into a granulator for granulation to obtain granular feed for injection, wherein the rotating speed range of the granulator is 20 r/min to 30r/min, the granulation temperature range of the granulator is 180 ℃ to 200 ℃, and the mixing time range is 2H to 4H;
s2, injection molding: the granular feed in the step S1 is placed into an injection mould in an injection machine, and the injection machine is used for blank injection to obtain a tin net workpiece, the working principle of the injection machine is that the plasticized feed in a molten state (namely, a viscous state) is injected into a closed mould cavity by means of the thrust of a screw (or a plunger), and then the product is obtained through solidification and shaping;
s3, degreasing: placing the earphone net workpiece into a degreasing furnace cavity, introducing nitric acid into the degreasing furnace cavity for degreasing, wherein the temperature range in the degreasing furnace cavity is 115-125 ℃, the temperature in the degreasing furnace cavity is 120 ℃, the mass range of the introduced nitric acid is 3-4.5 g/min, the degreasing time is 3.5H, the degreasing principle is that in the step S1, the feeding material mainly takes a plastic base as a main component, a binder component of the feeding material takes POM (polyformaldehyde) as a main component, and the feeding material also contains HDPE, EVA, PW and the like as a lubricant, oxygen atoms in carbon-oxygen building of a polyformaldehyde chain are very sensitive to acid action, and catalytic reaction is carried out at a certain temperature and proper acidity for seven minutes to cause the macromolecule to be cracked into HCHO (formaldehyde), so that the solid POM is quickly converted into gaseous formaldehyde, and degreasing is completed;
s4, sintering: and (2) putting the degreased earphone mesh workpiece into a sintering furnace for sintering, wherein the sintering temperature is 850-1285 ℃, the sintering working principle is that the metal powder is heated to a temperature lower than the melting point of the basic components, and then cooled to room temperature, and the metal powder particles are bonded as a result of sintering, so that the strength of the sintered body is increased, a series of physical and chemical changes are generated in the sintering process, and the aggregate of the powder particles is changed into the conglomerate of crystal particles. So as to obtain the product or material with the required physical and mechanical properties, the sintered powder particles are connected, and the densification and alloying are carried out;
s5, shaping: correcting the receiver net workpiece deformed after sintering, and adjusting the size of the receiver net workpiece to meet the size requirement;
s6, rough polishing: roughly polishing the shaped earphone net workpiece by using an abrasive cloth wheel;
s7, fine polishing: finely polishing the coarsely polished earphone net workpiece by using a flannelette wheel;
s8, PVD treatment plating: putting the receiver net workpiece which is finely polished into a PVD coating machine for PVD treatment coating, putting the receiver net and a target material for carrying out PVD treatment coating on the receiver net into the PVD coating machine, carrying out PVD treatment coating on the receiver net by using the PVD coating machine, wherein the target material can be a tungsten plate or a titanium plate, vacuumizing and heating the PVD coating machine, gasifying the target material, and depositing the gasified target material on the surface of the receiver net to finish the PVD treatment coating;
the working process of the PVD coating machine comprises the steps of firstly starting an air compressor and a circulating water system, then preparing vacuum, starting a molecular pump, filling Ar and other gases for breaking vacuum, then heating and drying, then cleaning a cavity and a base material of the PVD coating machine by using ion bombardment, finally vacuumizing, then performing sputtering coating, and finishing PVD treatment coating;
the method comprises the following steps that a receiver net needs to be cleaned in a PVD (physical vapor deposition) treatment plating process, the cleaning process comprises the steps of hanging the receiver net on the net, then removing wax, then degreasing and pickling the receiver net, then slowly pulling and cutting water on the receiver net, and finally baking the receiver net to finish cleaning of the receiver net;
the PVD process can plate gold, titanium, zirconium, chromium, copper, etc. on the earphone net, and the same metal can transmit different reaction gases (O)2、N2、C2H2) And the proportion of gas can form coating layers with different colors, the color depth is determined by the amount of introduced reaction gas, the earphone net with the deep color of the coating layer has harder hardness than the earphone net with the light color of the coating layer, because the introduced reaction gas is less, the titanium can not be saturated to react, the coating layer contains reaction titanium and pure titanium, the hardness of the pure titanium is lower than that of the reaction titanium, so that the hardness is reduced, and because the surface of the earphone net plated by PVD has the coating layer with higher hardness, the hardness of the earphone net is improvedDegree and the like;
and different reaction gases are added into a vacuum high-temperature reaction furnace of the high-temperature PVD coating machine, ions emitted by the target material and the reaction gases are combined on the surface of the earphone net to form coatings with different colors, and the changed ions are deposited on the surface layer of a product to form a compact film layer, for example, the reaction gas N is added2The gold coating formed on the surface of the earphone net is added with reaction gas C2H2The coating formed on the surface of the receiver net is black, and reaction gas O is added2The coating formed on the surface of the telephone receiver net is colorful and blue, and C is added2H2And N2The plating layer formed on the surface of the receiver net is gray, rose gold and other colors, so that the color requirement of the appearance of the receiver net is met;
s9, taking materials: taking out the earphone net workpiece which is subjected to PVD treatment plating from the PVD coating machine;
in the prior art, the tin net is produced by adopting plastics, the tin net produced by adopting the process has low material strength, can produce the tin net with a complex structure, and has high production precision and high productivity; the pressure casting process is adopted to produce the earphone net, the material strength is high, but only a simpler earphone net can be produced, the precision is low, and the productivity is high; the earphone mesh is produced by using a CNC (computer numerical control) processing mode, the material strength is high, but the produced earphone mesh has a simpler structure, high precision and low capacity; the earphone net produced by the invention has high strength, can produce the earphone net with a complex structure, and has high precision and high productivity;
the process of the invention is not only used for producing the tin net, but also other structures which have more complicated structures, narrow and long whole bodies and fine and numerous meshes are included in the protection scope of the invention.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (2)
1. The production process of the earphone net is characterized by comprising the following steps of:
s1, feeding: putting metal material powder for producing the tin screen into a granulator for granulation to obtain granular feed for injection, wherein the rotating speed range of the granulator is 20 r/min to 30r/min, the granulation temperature range of the granulator is 180 ℃ to 200 ℃, and the mixing time range is 2H to 4H;
s2, injection molding: placing the granular feed in the step S1 into an injection mould in an injection machine, and injecting a blank by using the injection machine to obtain a tin net workpiece;
s3, degreasing: placing the earphone net workpiece into a degreasing furnace cavity, introducing nitric acid into the degreasing furnace cavity for degreasing, wherein the temperature range in the degreasing furnace cavity is 115-125 ℃, the mass range of the introduced nitric acid is 3-4.5 g/min, and the degreasing time is 3.5H;
s4, sintering: placing the degreased earphone net workpiece into a sintering furnace for sintering, wherein the sintering temperature is 850-1285 ℃;
s5, shaping: correcting the receiver net workpiece deformed after sintering;
s6, rough polishing: roughly polishing the shaped earphone net workpiece by using an abrasive cloth wheel;
s7, fine polishing: finely polishing the coarsely polished earphone net workpiece by using a flannelette wheel;
s8, PVD treatment plating: putting the precisely polished earphone net work piece into a PVD coating machine for PVD treatment and coating;
s9, taking materials: and taking out the earphone net workpiece subjected to PVD treatment plating from the PVD coating machine.
2. The earphone net production process according to claim 1, wherein: the temperature in the degreasing furnace cavity in the step S3 is 120 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358390.9A CN111069608A (en) | 2019-12-25 | 2019-12-25 | Earphone net production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358390.9A CN111069608A (en) | 2019-12-25 | 2019-12-25 | Earphone net production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111069608A true CN111069608A (en) | 2020-04-28 |
Family
ID=70317746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911358390.9A Pending CN111069608A (en) | 2019-12-25 | 2019-12-25 | Earphone net production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111069608A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545757A (en) * | 2020-05-21 | 2020-08-18 | 深圳市富优驰科技有限公司 | Production process of rotating part |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105014080A (en) * | 2015-08-07 | 2015-11-04 | 萍乡市慧成精密机电有限公司 | Designing and manufacturing method of powder injection molding piston ring |
| CN108015272A (en) * | 2017-12-20 | 2018-05-11 | 湖南正阳精密陶瓷有限公司 | A kind of injection molding distribution of powder of stainless steel |
| CN108817402A (en) * | 2018-06-26 | 2018-11-16 | 深圳市鑫迪科技有限公司 | Metallic powder injection moulding process |
| CN109180183A (en) * | 2018-11-08 | 2019-01-11 | 江苏精研科技股份有限公司 | A kind of polyformaldehyde system formulation and a kind of powder injection molding process |
-
2019
- 2019-12-25 CN CN201911358390.9A patent/CN111069608A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105014080A (en) * | 2015-08-07 | 2015-11-04 | 萍乡市慧成精密机电有限公司 | Designing and manufacturing method of powder injection molding piston ring |
| CN108015272A (en) * | 2017-12-20 | 2018-05-11 | 湖南正阳精密陶瓷有限公司 | A kind of injection molding distribution of powder of stainless steel |
| CN108817402A (en) * | 2018-06-26 | 2018-11-16 | 深圳市鑫迪科技有限公司 | Metallic powder injection moulding process |
| CN109180183A (en) * | 2018-11-08 | 2019-01-11 | 江苏精研科技股份有限公司 | A kind of polyformaldehyde system formulation and a kind of powder injection molding process |
Non-Patent Citations (2)
| Title |
|---|
| 王纪安: "《金属工艺学实验》", 31 May 1998, 机械工业出版社 * |
| 袁军平等: "《流行饰品材料及生产工艺》", 31 January 2009, 中国地质大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545757A (en) * | 2020-05-21 | 2020-08-18 | 深圳市富优驰科技有限公司 | Production process of rotating part |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102351542B (en) | Preparation method of hollow-structure metal or ceramic part | |
| JP3443175B2 (en) | Method for producing titanium parts by sintering and decorative articles made using this kind of production method | |
| CN101623760B (en) | Application of micro injection molding technique for preparing tungsten-base alloy product and micro injection molding method of tungsten-base alloy powder | |
| KR100749395B1 (en) | Powder injection molding product, titanium coating product, sprayer for titanium coating and paste for titanium coating | |
| KR100725209B1 (en) | Powder injection molding method for forming article comprising titanium and titanium coating method | |
| CN108380888A (en) | A kind of MIM manufacturing process of weak magnetic 17-4PH material parts | |
| CN107573061B (en) | The manufacturing method and its application of honeycomb blind hole toughened zirconium oxide ceramic shell | |
| CN111390185A (en) | Production method of titanium alloy part | |
| CN111069608A (en) | Earphone net production process | |
| JPH03173706A (en) | Manufacture of the compact body consisting of a plurality of intermetallic compounds by sintering | |
| KR101995377B1 (en) | Method for preparing tungsten-molybdenum alloy | |
| JP2013067862A (en) | Method for integrally molding composite metal | |
| CN111299590A (en) | Preparation method of MIM 316L stainless steel highlight watch case | |
| KR102307862B1 (en) | Method of manufacturing metal/ceramic core/shell powder for 3D printing | |
| CN115338405B (en) | Preparation method of microinjection-formed iron-based small modulus gear | |
| KR20080042116A (en) | Siox:si composite articles and methods of making same | |
| CN107382311A (en) | A kind of preparation method of ceramic component | |
| CN104928539A (en) | Vanadium-aluminium-silicon ternary alloy target material and preparation method thereof | |
| CN111515378A (en) | Process for directly forming colorful metal by MIM (metal injection molding) | |
| CN104107915A (en) | Method for manufacturing cabinet plugged box lifting handle based on PIM technology | |
| CN111992722A (en) | Complex MIM part machining method | |
| JPH03232906A (en) | Combined sintered product | |
| KR100563770B1 (en) | Manufacturing method of sintered diamond tool by metal powder injection molding process | |
| CN116855902B (en) | Low-aluminum-content titanium-based target material and preparation method thereof | |
| KR100584190B1 (en) | Method of manufacturing of composite mold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200428 |
|
| RJ01 | Rejection of invention patent application after publication |