CN108381118B - Preparation method of integrally-formed stainless steel insert structure - Google Patents
Preparation method of integrally-formed stainless steel insert structure Download PDFInfo
- Publication number
- CN108381118B CN108381118B CN201810073383.3A CN201810073383A CN108381118B CN 108381118 B CN108381118 B CN 108381118B CN 201810073383 A CN201810073383 A CN 201810073383A CN 108381118 B CN108381118 B CN 108381118B
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- metal
- outer frame
- frame
- steel outer
- 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.)
- Expired - Fee Related
Links
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
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
Abstract
The invention relates to a preparation method of an integrally formed stainless steel insert structure, which comprises the following steps: (1) processing stainless steel powder into a stainless steel outer frame insert blank by a powder metallurgy process; (2) and forging the stainless steel outer frame insert blank, and then carrying out CNC finish machining to form the stainless steel outer frame. The invention has the advantages that: 1. the mobile phone shell structural part formed by the stainless steel powder metallurgy outer frame, the die-cast aluminum middle frame and the plastic assembly structure in an integrated mode is realized. 2. Adopt powder metallurgy shaping structure frame structure, promoted the processing rate of stainless steel, realized stainless steel outward appearance effect.
Description
Technical Field
The invention relates to a manufacturing method of a mobile phone shell structure, in particular to a manufacturing method of an integrally formed stainless steel insert structure.
Background
Because stainless steel has good hardness and mechanical strength, and is an ideal material for preparing mobile phone shells, various mobile phone manufacturers have adopted the scheme, but the scheme is limited by the following aspects:
1. stainless steel has high melting point, large pressure of die-casting molding, difficult bearing of a die and equipment, and a precise complex structural part can not be produced by a die-casting process generally, but must be prepared by extruding or forging blanks through numerical control processing, so that the cost is greatly improved and the efficiency is greatly reduced, and the processing mode is only adopted by mobile phone middle frames such as apples and the like at present;
2. on the other hand, the stainless steel of powder metallurgy is formed, and the process needs degreasing and sintering processes, so that the product precision is low, the deformation is large, and the method is only suitable for small and simple product structures, and the application of the method in the aspect of mobile phone shells is limited.
3. The stainless steel is very difficult to machine by CNC due to the characteristics of high hardness and high strength, and a surface of the stainless steel is hardened by a CNC cutter and the surface of the stainless steel due to high cutting temperature during CNC machining, so that the difficulty and the cost of stainless steel machining are further increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of an integrally formed stainless steel insert structure, which can realize the stainless steel appearance of a mobile phone shell, can reduce the processing amount and is easy for batch production, and the technical scheme of the invention is as follows: the preparation method of the integrally formed stainless steel insert structure comprises the following steps:
(1) processing stainless steel powder into a stainless steel outer frame insert by a powder metallurgy process;
(2) forging or stamping the stainless steel outer frame insert to form a stainless steel outer frame;
(3) putting the processed stainless steel outer frame and the middle frame into a die-casting die for integral forming, so that the stainless steel outer frame and the middle frame are tightly combined to form a metal inner frame;
(4) carrying out CNC finish machining on the metal inner frame so as to be convenient for forming in the plastic mold;
(5) according to the design requirements of products, nano-scale micropores are corroded on the surface of the metal inner frame after CNC finish machining so as to enhance the binding force between the metal inner frame and the plastic mold;
(6) placing the metal inner frame into a plastic mold for nano injection molding to form a plastic mold and metal inner frame integrated structural part;
(7) carrying out CNC (computer numerical control) finish machining on the side key hole, the antenna breakpoint, the antenna contact, the grounding point and the assembly size allowance of the integrated structural part;
(8) and sequentially carrying out polishing and sand blasting appearance decoration treatment or wire drawing and PVD surface treatment on the surface of the integrated structural part to obtain a bright metal texture effect.
The step (1) is specifically as follows:
1.1, according to the process requirements, banburying and injection molding required raw materials of SUS304 or SUS 316L;
1.2, processing SUS304 or SUS316L raw materials into a stainless steel outer frame structural member by using a powder metallurgy injection molding process;
1.3, sequentially carrying out degreasing, sintering and shaping on the stainless steel outer frame structural member to prepare a stainless steel outer frame semi-finished product;
and 1.4, processing the semi-finished product of the stainless steel outer frame into a stainless steel outer frame insert, and reserving a processing allowance.
The step (2) is specifically as follows:
2.1, stamping or forging and pressing the stainless steel outer frame insert, machining redundant feed inlets and exhaust slag ladles to form a stainless steel outer frame, and preprocessing a shape structure required by the stainless steel outer frame, a fabrication hole required by an injection molding process and a combination mechanism matched with the middle frame required in a die-casting die through CNC;
2.2, carrying out CNC finish machining on the inner side of the stainless steel outer frame to form a glue drawing structure so as to be favorable for being tightly combined with a middle frame in the subsequent step, wherein the middle frame is a die-cast aluminum middle frame;
the process for integrally forming the die-casting mould in the step (3) is a bimetal composite die-casting process, namely compounding a stainless steel outer frame and a die-casting aluminum middle frame; the die-casting aluminum middle frame is manufactured by adopting ADC12 or REGAL-S33N.
The step (4) is specifically as follows:
4.1, performing CNC (computerized numerical control) finish machining, and arranging a metal glue drawing structure in the metal inner frame, wherein the metal glue drawing structure is a through hole or a blind hole with the diameter of more than 1 mm; or a clamping groove which is convex or concave 1 mm;
4.2, processing a metal cutting position and a metal connecting position to ensure that the metal inner frame on the outer side can be finally separated by post-processing and prevent the closed metal inner frame from influencing signals; the metal cutting position and the metal connecting position are as follows: before the nanometer was moulded plastics, the position is cut to the inboard of metal inside casing and the position is cut in the outside and is passed through the metal and even the material level is connected, and the position is cut to the upside of metal inside casing and the position is cut to the downside and also is connected through the metal even material level, and the metal is even the thickness of material level and is greater than 0.6mm, before guaranteeing that the nanometer is moulded plastics, links as an organic whole with each part of metal inside casing, convenient processing.
The step (6) is specifically as follows:
6.1, the plastic used in the nano injection molding is formed by mixing nano injection-molded PPS or PBT with glass fiber according to the weight ratio of 1-5: 5-9;
6.2, carrying out metal inner frame pretreatment on the metal inner frame during nano injection molding, wherein the metal inner frame is subjected to heating or baking pretreatment before nano injection molding, the heating temperature is 100 ℃ and ~ 230 ℃ to eliminate the problems of shrinkage cracking, warping deformation and reduced bonding force of the plastic and the metal inner frame after molding due to material, characteristic and process difference as much as possible, and then carrying out nano injection molding treatment;
6.3, after molding, if the problem of slight glue overflow treatment exists, deburring is carried out to improve the product quality.
The invention has the advantages that:
1. the mobile phone shell structural part formed by the stainless steel powder metallurgy outer frame, the die-cast aluminum middle frame and the plastic assembly structure in an integrated mode is realized.
2. Adopt powder metallurgy shaping structure frame structure, promoted the processing rate of stainless steel, realized stainless steel outward appearance effect.
3. The internal structure of the middle frame is prepared by adopting a die-casting method, so that the processing cost and the processing period of stainless steel are reduced, and the material utilization rate is improved.
4. The combination of powder metallurgy and die-casting technology makes up the problems that the powder metallurgy stainless steel forming technology has large product deformation and low manufacturing precision, and cannot prepare large-size precise structural parts.
5. The use requirements of high-added-value consumer electronics such as mobile phones and 3C electronic products on high hardness, high strength, scratch resistance, falling resistance and deformation resistance of the shell surface are met, and the development of the industry technology is promoted;
6. the high-end stainless steel material is no longer exclusive to the high-end luxury brand, a fashionable and novel structure and process are provided for designers, and the high-end stainless steel material is civilized and practical and benefits more people.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
The preparation method of the integrally formed stainless steel insert structure comprises the following steps:
(1) processing stainless steel powder into a stainless steel outer frame insert blank by a powder metallurgy process;
(2) forging or stamping the stainless steel outer frame insert to form a stainless steel outer frame;
(3) putting the processed stainless steel outer frame and the middle frame into a die-casting die for integral forming, so that the stainless steel outer frame and the middle frame are tightly combined to form a metal inner frame;
(4) carrying out CNC finish machining on the metal inner frame so as to be convenient for forming in the plastic mold;
(5) according to the design requirements of products, nano-scale micropores are corroded on the surface of the metal inner frame after CNC finish machining so as to enhance the binding force between the metal inner frame and the plastic mold;
(6) placing the metal inner frame into a plastic mold for nano injection molding to form a plastic mold and metal inner frame integrated structural part;
(7) carrying out CNC (computer numerical control) finish machining on the side key hole, the antenna breakpoint, the antenna contact, the grounding point and the assembly size allowance of the integrated structural part;
(8) and sequentially carrying out polishing and sand blasting appearance decoration treatment or wire drawing and PVD surface treatment on the surface of the integrated structural part to obtain a bright metal texture effect.
The step (1) is specifically as follows:
1.1, according to the process requirements, banburying and injection molding required raw materials of SUS304 or SUS 316L;
1.2, processing SUS304 or SUS316L raw materials into a stainless steel outer frame structural member by using a powder metallurgy injection molding process;
1.3, sequentially carrying out degreasing, sintering and shaping on the stainless steel outer frame structural member to prepare a stainless steel outer frame semi-finished product;
and 1.4, processing the semi-finished product of the stainless steel outer frame into a stainless steel outer frame insert, and reserving a processing allowance.
The step (2) is specifically as follows:
2.1, stamping or forging and pressing the stainless steel outer frame insert, machining redundant feed inlets and exhaust slag ladles to form a stainless steel outer frame, and preprocessing a shape structure required by the stainless steel outer frame, a process hole required by an injection molding process and a combined mechanism matched with die-cast aluminum required in a die-cast die through CNC;
2.2, precisely machining the inner side of the stainless steel outer frame by using CNC (computerized numerical control) to form a glue drawing structure so as to be favorable for being tightly combined with a middle frame in the subsequent step, wherein the middle frame is a die-cast aluminum middle frame.
The process for integrally forming in the die-casting mould in the step (3) comprises the following steps
A bimetal composite die-casting process, namely compounding a stainless steel outer frame and a die-cast aluminum middle frame; the die-casting aluminum middle frame is manufactured by adopting ADC12 or REGAL-S33N.
The step (4) is specifically as follows:
4.1, performing CNC (computerized numerical control) finish machining, and arranging a metal glue drawing structure in the metal inner frame, wherein the metal glue drawing structure is a through hole or a blind hole with the diameter of more than 1 mm; or a clamping groove which is convex or concave 1 mm;
4.2, processing a metal cutting position and a metal connecting position to ensure that the metal inner frame on the outer side can be finally separated by post-processing and prevent the closed metal inner frame from influencing signals; the metal cutting position and the metal connecting position are as follows: before nano injection molding, the inner side cutting position and the outer side cutting position of the metal inner frame are connected through a metal connecting material level, the upper side cutting position and the lower side cutting position of the metal inner frame are also connected through a metal connecting material level, the thickness of the metal connecting material level is larger than 0.6mm, and all parts of the metal inner frame are connected into a whole before nano injection molding, so that the processing is convenient;
the step (6) is specifically as follows:
6.1, the plastic used in the nano injection molding is formed by mixing nano injection-molded PPS or PBT with glass fiber according to the weight ratio of 1-5: 5-9;
6.2, carrying out metal inner frame pretreatment on the metal inner frame during nano injection molding, wherein the metal inner frame is subjected to heating or baking pretreatment before nano injection molding, the heating temperature is 100 ℃ and ~ 230 ℃ to eliminate the problems of shrinkage cracking, warping deformation and reduced bonding force of the plastic and the metal inner frame after molding due to material, characteristic and process difference as much as possible, and then carrying out nano injection molding treatment;
6.3, after molding, if the problem of slight glue overflow treatment exists, deburring is carried out to improve the product quality.
Claims (3)
1. A preparation method of an integrally formed stainless steel insert structure is characterized by comprising the following steps:
(1) processing stainless steel powder into a stainless steel outer frame insert by a powder metallurgy process;
(2) forging or stamping the stainless steel outer frame insert to form a stainless steel outer frame; preparing the internal structure of the middle frame by adopting a die-casting method;
(3) putting the processed stainless steel outer frame and the middle frame into a die-casting die for integral forming, so that the stainless steel outer frame and the middle frame are tightly combined to form a metal inner frame;
(4) carrying out CNC finish machining on the metal inner frame so as to be convenient for forming in the plastic mold;
(5) according to the design requirements of products, nano-scale micropores are corroded on the surface of the metal inner frame after CNC finish machining so as to enhance the bonding force between the metal inner frame and the plastic;
(6) placing the metal inner frame into a plastic mould for nano injection molding to form a plastic and metal inner frame integrated structural part;
(7) carrying out CNC (computer numerical control) finish machining on the side key hole, the antenna breakpoint, the antenna contact, the grounding point and the assembly size allowance of the integrated structural part;
(8) sequentially carrying out polishing and sand blasting appearance decoration treatment or wire drawing and PVD surface treatment on the surface of the integrated structural part to obtain a bright metal texture effect;
the step (1) is specifically as follows:
1.1, according to the process requirements, banburying and injection molding required raw materials of SUS304 or SUS 316L;
1.2, processing SUS304 or SUS316L raw materials into a stainless steel outer frame structural member by using a powder metallurgy injection molding process;
1.3, sequentially carrying out degreasing, sintering and shaping on the stainless steel outer frame structural member to prepare a stainless steel outer frame semi-finished product;
1.4, processing the semi-finished product of the stainless steel outer frame into a stainless steel outer frame insert, and reserving a processing allowance;
the step (2) is specifically as follows:
2.1, stamping or forging and pressing the stainless steel outer frame insert, machining redundant feed inlets and exhaust slag ladles to form a stainless steel outer frame, and preprocessing a shape structure required by the stainless steel outer frame, a fabrication hole required by an injection molding process and a combination mechanism matched with the middle frame required in a die-casting die through CNC;
2.2, carrying out CNC finish machining on the inner side of the stainless steel outer frame to form a glue drawing structure so as to be favorable for being tightly combined with a middle frame in the subsequent step, wherein the middle frame is a die-cast aluminum middle frame;
the step (6) is specifically as follows:
6.1, the plastic used in the nano injection molding is formed by mixing nano injection-molded PPS or PBT with glass fiber according to the weight ratio of 1-5: 5-9;
6.2, carrying out metal inner frame pretreatment on the metal inner frame when nano injection molding, and specifically comprising the following steps: before nano injection molding, carrying out heating or baking pretreatment on the metal inner frame, wherein the heating temperature is between 100 and 230 ℃ so as to eliminate the problems of shrinkage cracking, warping deformation and reduced bonding force of the plastic and the metal inner frame after molding due to material, characteristic and process difference as much as possible, and then carrying out nano injection molding treatment;
6.3, after molding, if the problem of slight glue overflow treatment exists, deburring is carried out to improve the product quality.
2. The method for preparing an integrally formed stainless steel insert structure according to claim 1, wherein the process of integrally forming in the die-casting mold in the step (3) is a bimetal composite die-casting process, i.e. the stainless steel outer frame and the die-casting aluminum middle frame are compounded; the die-casting aluminum middle frame is manufactured by adopting ADC12 or REGAL-S33N.
3. The method for preparing the integrally formed stainless steel insert structure according to claim 1, wherein the step (4) is specifically as follows:
4.1, performing CNC (computerized numerical control) finish machining, and arranging a metal drawing structure in the metal inner frame, wherein the metal drawing structure is a through hole or a blind hole with the diameter of more than 1 mm; or a clamping groove which is convex or concave 1 mm;
4.2, processing a metal cutting position and a metal connecting position to ensure that the metal inner frame on the outer side can be finally separated by post-processing and prevent the closed metal inner frame from influencing signals; the metal cutting position and the metal connecting position are as follows: before the nanometer was moulded plastics, the position is cut to the inboard of metal inside casing and the position is cut in the outside and is passed through the metal and even the material level is connected, and the position is cut to the upside of metal inside casing and the position is cut to the downside and also is connected through the metal even material level, and the metal is even the thickness of material level and is greater than 0.6mm, before guaranteeing that the nanometer is moulded plastics, links as an organic whole with each part of metal inside casing, convenient processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810073383.3A CN108381118B (en) | 2018-01-25 | 2018-01-25 | Preparation method of integrally-formed stainless steel insert structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810073383.3A CN108381118B (en) | 2018-01-25 | 2018-01-25 | Preparation method of integrally-formed stainless steel insert structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108381118A CN108381118A (en) | 2018-08-10 |
| CN108381118B true CN108381118B (en) | 2020-01-10 |
Family
ID=63076481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810073383.3A Expired - Fee Related CN108381118B (en) | 2018-01-25 | 2018-01-25 | Preparation method of integrally-formed stainless steel insert structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108381118B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114211683B (en) * | 2021-10-28 | 2022-10-14 | 荣耀终端有限公司 | Display device, mold, injection molding system and method for manufacturing battery cover of injection molding system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105120625A (en) * | 2015-07-31 | 2015-12-02 | 广东欧珀移动通信有限公司 | Method for machining metal casing, metal casing and electronic equipment |
| CN105798549A (en) * | 2016-05-03 | 2016-07-27 | 东莞市鑫濠信精密工业有限公司 | Manufacturing method for compound die-casting formed mobile phone middle frame |
| CN106217914A (en) * | 2016-09-06 | 2016-12-14 | 东莞市鑫濠信精密工业有限公司 | The manufacture method of the mobile phone center of composite injection molding molding |
| CN106375522A (en) * | 2016-10-29 | 2017-02-01 | 广东金三甲精密科技有限公司 | Composite metal phone case and production process thereof |
| CN106435686A (en) * | 2016-10-10 | 2017-02-22 | 东莞劲胜精密组件股份有限公司 | Manufacturing method of mobile phone middle frame |
| CN107088987A (en) * | 2017-06-21 | 2017-08-25 | 王强 | Phone housing manufacturing process |
-
2018
- 2018-01-25 CN CN201810073383.3A patent/CN108381118B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105120625A (en) * | 2015-07-31 | 2015-12-02 | 广东欧珀移动通信有限公司 | Method for machining metal casing, metal casing and electronic equipment |
| CN105798549A (en) * | 2016-05-03 | 2016-07-27 | 东莞市鑫濠信精密工业有限公司 | Manufacturing method for compound die-casting formed mobile phone middle frame |
| CN106217914A (en) * | 2016-09-06 | 2016-12-14 | 东莞市鑫濠信精密工业有限公司 | The manufacture method of the mobile phone center of composite injection molding molding |
| CN106435686A (en) * | 2016-10-10 | 2017-02-22 | 东莞劲胜精密组件股份有限公司 | Manufacturing method of mobile phone middle frame |
| CN106375522A (en) * | 2016-10-29 | 2017-02-01 | 广东金三甲精密科技有限公司 | Composite metal phone case and production process thereof |
| CN107088987A (en) * | 2017-06-21 | 2017-08-25 | 王强 | Phone housing manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108381118A (en) | 2018-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107756722B (en) | Mobile phone shell and preparation method thereof | |
| CN104775054B (en) | A kind of Al-alloy products and preparation method thereof | |
| CN104411124B (en) | Electronic equipment assembly and its manufacture method | |
| CN105798549A (en) | Manufacturing method for compound die-casting formed mobile phone middle frame | |
| CN105306632A (en) | Mobile phone shell and shell manufacturing process thereof | |
| CN106659015B (en) | Electronic product frame body integrally-formed structural part and manufacturing method thereof | |
| CN107263017A (en) | Suitable for the production technology of the aluminum alloy frame of the integrated die-casting shaping of anodic oxidation | |
| CN103192051A (en) | Manufacturing method of ultra thin-walled light metal alloy housing or frame | |
| CN105195745A (en) | Method for manufacturing mobile phone middle frame through powder injection forming technology | |
| CN201889363U (en) | Drawing and forming die for magnesium-alloy surface casing of notebook computer | |
| CN206077897U (en) | A kind of 3C electronic product casings, metal blank and 3C electronic products | |
| CN107088987A (en) | Phone housing manufacturing process | |
| CN108381118B (en) | Preparation method of integrally-formed stainless steel insert structure | |
| CN107398559A (en) | A kind of powder injection-molded method of large parts for support of arranging in pairs or groups | |
| CN109365731A (en) | A kind of die forging method of high temperature alloy precision forged blade | |
| CN111906271A (en) | Vacuum die-casting die for amorphous alloy flexible gear of harmonic reducer and method thereof | |
| CN105603487B (en) | Preparation method, metal shell and the electronic equipment of anodized metallization housing | |
| CN101862821A (en) | Manufacture process of stainless steel zinc covering alloy shell | |
| JPH0480688A (en) | Preparation of part for timepiece | |
| CN106001579A (en) | Technology for manufacturing panel of golf club | |
| CN107009098A (en) | A kind of preparation method and applications of automobile telecommunication sheet metal component | |
| CN102510695A (en) | Forging and stamping machining method of communication type and consumer electronics type aluminum alloy cavities | |
| CN209277699U (en) | A kind of panel construction of panel lock | |
| CN107028305A (en) | A kind of processing method of hollow gold ornaments | |
| CN101644264B (en) | Method for manufacturing air compressor moving plate |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200110 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |