CN105852340A - Processing method of precious metal pearl jewelry - Google Patents
Processing method of precious metal pearl jewelry Download PDFInfo
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- CN105852340A CN105852340A CN201610275376.2A CN201610275376A CN105852340A CN 105852340 A CN105852340 A CN 105852340A CN 201610275376 A CN201610275376 A CN 201610275376A CN 105852340 A CN105852340 A CN 105852340A
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- pearl
- metal tube
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
- A44C27/001—Materials for manufacturing jewellery
- A44C27/002—Metallic materials
-
- 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
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- 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
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Adornments (AREA)
Abstract
The invention discloses a processing method of precious metal pearl jewelry. The rolling technology and the stamping technology are optimized, and the precious metal pearl jewelry is produced through a titanium plating technology and finishing treatment; the wear resistance and corrosion resistance of the precious metal pearl jewelry are improved while the forming quality and processing accuracy are guaranteed, and the bright metal gloss of the precious metal pearl jewelry can be maintained for long; and meanwhile, the compatibility between the obtained precious metal pearl jewelry and the human skin is better, and the probability of skin allergy is lower.
Description
Technical field
The invention belongs to noble metal and shape technical field, particularly relate to a kind of noble metal pearl class processing of ornament method.
Background technology
The methods such as typically conventional the having of noble metal: Au Ag Pt Pd and alloy thereof, manufactures ornaments and industrial components typically uses following process manufacture: make by hand, hot investment casting, pressure processing, machining, electroforming, welding.In noble metal pearl class ornament, the pearl class of various styles and moulding and chain class noble metal jewelry, the kind making precious metal jewelry is complicated, but the most therefore challenge technological ability and the technical merit of manufacturing enterprise, therefore, noble metal jewelry processing factory is generally provided with the portion of getting the raw materials ready, to realize stretching noble metal ingot in various plant equipment, punching press, it is wound around, the operations such as shearing, for other departments be processed further prepare preliminary blank, therefore, in noble metal processing, the plant equipment of exploitation has arm-tie, drawing machine, tablet machine, oil pressure die press, eat up part of die press, twisted piece machine etc..
In the noble metal pearl class jewelry of existing use, the quality of pearl shape part, dimensional accuracy and surface flatness are all to affect the necessary factor of its price, during these pearl shape ornaments of people's long periods of wear, pearl shape ornament is often corroded by external environment condition and aoxidizes, if people are when wearing gold jewelry, gold can absorb the toxin of application on human skin or can interact and jaundice of turning black with the perspiration on skin, simultaneously, gold also can react with the hydrargyrum in cosmetics and the sulfur in air and turn black, when gold and platinum phase mutual friction, also can turn white because rubbing upper platinum on the surface of gold, these all can cause gold to lose metallic luster and affect the decorative value of gold；When people wear silver jewellery, outside desilver can be aoxidized by external environment condition, owing to silver jewellery surface flatness is inadequate, also can accelerate the oxidation of silver surface, and cause silver jewellery to lose metallic luster, and then affect the decorative value of jewelry.Further, since the highest gold of purity and silver, their pliability is the highest, and wearability is the lowest, and when people wear these jewelry, in long-term scratch, the quality of gold and silver can slowly reduce, and then owner is caused economic loss.
Summary of the invention
The goal of the invention of the present invention is: for the problem of above-mentioned existence, a kind of noble metal pearl class processing of ornament method is provided, by optimizing rolling mill practice and Sheet Metal Forming Technology, utilize technology for plating titanium and light decorations to process and produce noble metal pearl class jewelry, in the case of ensureing Forming Quality and machining accuracy, improve wearability and the corrosion resistance of noble metal pearl class jewelry, make noble metal pearl class jewelry can keep the metallic luster of light for a long time, simultaneously, the compatibility that can also make noble metal pearl class jewelry and the application on human skin obtained is more preferable, and the probability of the phenomena of cutaneous irritation of initiation is lower.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows: a kind of noble metal pearl class processing of ornament method, comprises the following steps:
Step one, product design figure according to the noble metal of required processing, make the diel of press, so that can obtain meeting the stamping products of design in follow-up stamping procedure；
Step 2, by the blank of noble metal through roll squeezer be pressed into meet design require lath；
Step 3, on a surface of noble metal lath by magnetron sputtering method, plate last layer titanium film；
Step 4, the noble metal lath in step 3 is carried out recrystallization annealing, to eliminate processing hardening phenomenon, be then curled into pipe fitting with coiling machine, wherein, it is coated with the one of titanium film facing in pipe, the most again two limits is carried out seamless welding, to form circular tube shaped metal tube；
Step 5, metal tube is made annealing treatment, then by metal tube drawing the most step by step on strain plate, until being drawn into the metal tube meeting design size；
Step 6, the metal tube drawn is put in the diel of press, be pressed into required outer shape, obtain the metal tube of pearl shape series winding；
Step 7, the metal tube contacting pearl shape cut, and obtain pearl shape part, the most again pearl shape part are carried out titanizing, and method still uses magnetron sputtering method；
Step 8, the surface clean that carried out by the pearl shape part obtained, then the surface at pearl shape part carries out car flower processing, obtains the pearl shape part of required surface configuration；
Step 9, the pearl shape part obtained is carried out surface clean, then carry out light decorations process by centrifugal finishing machine, after light decorations have processed, place into immersion 1-3h in dehydrated alcohol, finally take out drying, detect examination after drying.
nullIn above-mentioned processing step，The technology for plating titanium increased can greatly improve the anti-wear performance of noble metal，Technology for plating titanium is a kind of titanizing/zirconium metallic surface processing method，In order to improve the wearability of object surface，In the present invention，Use vacuum magnetic-control sputtering method that precious metal surface is carried out coating film treatment，Color and luster color according to noble metal lath，Select the color of matched plated film，Selectable color has gold、Brass、Silvery white etc.，Then at its plated surface last layer titanium film，Owing to using vacuum magnetic-control sputtering method，The thickness of the plated film obtained is not over 1 μm，In follow-up drawing and stamping procedure，Extensional due to metal tube，The titanium film thickness on precious metal surface is made to reduce further，Pass through rough calculation，The weight of plated film is the least the least，It is negligible，The weight of the pearl shape ornaments obtaining the later stage is the least，The dimensional accuracy of pearl shape part is affected the least.On anti-wear performance, titanium film have high rigidity, antifriction, do not peel off, be difficult to the features such as scuffing, will not peel under ultraviolet light, these performances can make precious metal jewelry will not be worn in scratch friction process, and the weight of noble metal can almost keep constant weight；In corrosion resistance; titanium film has height anti-corrosive properties; Surface of Titanium Film either titanium nitride, titanium carbide or titanium carbonitride; all there is the strongest chemical stability, not with general acid-base reaction, be difficult to be etched electrochemically; will not be with the chemical industry element reaction of hydrargyrum etc; the surface of precious metal jewelry can be protected, make precious metal surface will not turn black the phenomenon turned white, also will not adhere to other metal ingredients；In processing characteristics, titanium film has good plasticity, more than 90-degree bent, is not easy to the defects such as fracture, decortication and galled spots occur, and therefore, the quality of coating is affected less in following process by the noble metal lath after titanizing；In durability, the color of the titanium film of formation also will not fade when life-time service, and anti-destructive is relatively strong, surface easy cleaning, and after adoring through light, the coupler surface of titanium film can maintain more than 20 years；It is coated with the noble metal of titanium film when directly contacting with human body skin, the occurrence probability of allergic phenomena can be reduced, make part that the crowd of the noble metal allergy such as yellow gold, silver also can be worn.
Machining accuracy and surface in order to ensure noble metal are moist, using metal tube drawing the most step by step, until being drawn into the design size met, so can guarantee that the thickness of pipe of obtained metal tube is uniform, surface is moist, flawless, fold, the defect such as ruptures；By the pearl shape part obtained is carried out light decorations process, make the smooth surface of pearl shape part, delay the electrochemical corrosion suffered by its surface, increase surface quality and the aesthetic appearance of pearl shape part.
Uniform in order to preferably obtain thickness, the noble metal lath that dimensional accuracy is high, in step 2, pressing process specifically includes: first make annealing treatment noble metal blank, in order to packing pressure is processed, and then noble metal blank is carried out breaking down, after breaking down, noble metal blank is made annealing treatment, to eliminate processing hardening phenomenon and residual stress, after annealing, carries out finish rolling.
Further, in step 4, the thickness of general pearl shape part is between 0.5-2mm, and therefore seamless welding uses argon tungsten-arc welding, a diameter of 0.6-1.0mm of tungsten electrode, gage of wire is 1.6mm, welding current is 120-160A, and argon flow amount is 14-18L/min, and nozzle bore is 8-12mm, wire feed rate is 108-117cm/min, to obtain satisfactory weld seam.
Further, in step 5, before carrying out drawing, choose the drawing mould of a set of required form size, then one end of metal tube is inserted in pulling eye, metal tube is applied pulling force and is passed to pulling eye, make metal tube pass through the pulling eye that more previous pulling eye aperture is little the most again, to reach progressively deformation, finally give the metal tube meeting design size.
For ensureing that metal tube does not haves fold in hammer pearl deformation process, the defect such as ruptures, in step 6, concretely comprising the following steps of pressed metal pipe:
Step 1, the length that the metal tube drawn is saved less than a pearl in the charging aperture feeding of press, the head entrance punching press grinding tool of metal tube；
Step 2, parameter request according to deisgn product, determine the diameter of noble metal pearl class, the pearl joint length obtained, and rotary index during hammer pearl machine hammer pearl is 60 °；
Step 3, startup press, make hammering diel of press, and metal tube produces plastic deformation for the first time；
After the plastic deformation for the first time of step 4, metal tube completes, rotating metallic pipe 60 °, then repeats step 3, until metal tube has turned 360 °；
After step 5, step 4 complete, the press demoulding, the length of a pitch that metal tube is advanced in mould, press matched moulds, use the process for stamping gradually increasing amount of plastic deformation, complete second time necking down and the first time necking down molding of second pearl joint of first pearl joint simultaneously, repetition step 3 is to step 4, until completing the molding of whole metal tube, obtains the metal tube of pearl shape series winding, in above-mentioned, pitch refers to that the joint molding later pearl joint of pearl in materials in the tube is in the axial length of pipe.
Further, in step 9, the pearl shape part obtained being put into the keg of centrifugal finishing machine, start motor, the major parameter of regulation centrifugal finishing machine, the rotating speed making centrifugal finishing machine is 180-200rad/min.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: the noble metal pearl class processing of ornament method of the present invention, by optimizing rolling mill practice and Sheet Metal Forming Technology, utilize technology for plating titanium and light decorations to process and produce noble metal pearl class jewelry, in the case of ensureing processing characteristics and machining accuracy, improve wearability and the corrosion resistance of noble metal pearl class jewelry, make noble metal pearl class jewelry can keep the metallic luster of light for a long time, simultaneously, the noble metal pearl class jewelry obtained can also be made more preferable with the compatibility of application on human skin, the probability of the phenomena of cutaneous irritation caused is lower.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in detail.
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
A kind of noble metal pearl class processing of ornament method, described noble metal includes gold and silver, and processing method comprises the following steps:
Step one, product design figure according to the noble metal of required processing, make the diel of press；
Step 2, first noble metal blank is made annealing treatment, then deliver to noble metal blank carry out breaking down at roll squeezer, after breaking down, noble metal blank is made annealing treatment, after annealing, carry out finish rolling, to obtain meeting the lath that design requires；
Step 3, on a surface of noble metal lath by magnetron sputtering method, plate last layer titanium film；
Step 4, the noble metal lath in step 3 is carried out recrystallization annealing, to eliminate processing hardening phenomenon, then it is curled into pipe fitting with coiling machine, wherein, it is coated with the one of titanium film facing in pipe, the most again two limits are carried out seamless welding, seamless welding uses argon tungsten-arc welding, the a diameter of 0.6-1.0mm of tungsten electrode, gage of wire is 1.6mm, and welding current is 120-160A, argon flow amount is 14-18L/min, nozzle bore is 8-12mm, and wire feed rate is 108-117cm/min, obtains the circular tube shaped metal tube with qualified weld seam；
Step 5, metal tube is made annealing treatment, then by metal tube drawing the most step by step on strain plate, before carrying out drawing, choose the drawing mould of a set of required form size, then one end of metal tube is inserted in pulling eye, metal tube is applied pulling force and is passed to pulling eye, make metal tube pass through the pulling eye that more previous pulling eye aperture is little the most again, to reach progressively deformation, until being drawn into the metal tube meeting design size；
Step 6, the metal tube drawn is put in the diel of press, be pressed into required outer shape, obtain the metal tube of pearl shape series winding；
Step 7, the metal tube contacting pearl shape cut, and obtain pearl shape part；
Step 8, the surface clean that carried out by the pearl shape part obtained, then the surface at pearl shape part carries out car flower processing, obtains the pearl shape part of required surface configuration, the most again pearl shape part is carried out titanizing, and method still uses magnetron sputtering method；
Step 9, the pearl shape part obtained is carried out surface clean, then light decorations process is carried out by centrifugal finishing machine, the concrete light decorations process time determines according to the kind of noble metal, the size of pearl shape part obtained and the size of the disposable treating capacity of light polishing machine, after light decorations have processed, the pearl shape part obtained is put into the keg of centrifugal finishing machine, start motor, the major parameter of regulation centrifugal finishing machine, the rotating speed making centrifugal finishing machine is 180-200rad/min, place into immersion 1-3h in dehydrated alcohol, finally take out drying, detect examination after drying.
In above-mentioned procedure of processing, concretely comprising the following steps of described step 6:
Step 1, the length that the metal tube drawn is saved less than a pearl in the charging aperture feeding of press, the head entrance punching press grinding tool of metal tube；
Step 2, parameter request according to deisgn product, determine the diameter of noble metal pearl class, the pearl joint length obtained, and rotary index during hammer pearl machine hammer pearl is 60 °；
Step 3, startup press, make hammering diel of press, and metal tube produces plastic deformation for the first time；
After the plastic deformation for the first time of step 4, metal tube completes, rotating metallic pipe 60 °, then repeats step 3, until metal tube has turned 360 °；
After step 5, step 4 complete, the press demoulding, the length of a pitch that metal tube is advanced in mould, press matched moulds, uses the process for stamping gradually increasing amount of plastic deformation, completes second time necking down and the first time necking down molding of second pearl joint of first pearl joint simultaneously, repeat step 3 to step 4, until completing the molding of whole metal tube, obtaining the metal tube of pearl shape series winding, metal tube segments moulding process completes.
This processing method is in the case of ensureing processing characteristics and machining accuracy, improve wearability and the corrosion resistance of noble metal pearl class jewelry, make noble metal pearl class jewelry can keep the metallic luster of light for a long time, simultaneously, the compatibility that can also make noble metal pearl class jewelry and the application on human skin obtained is more preferable, and the probability of the phenomena of cutaneous irritation of initiation is lower.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (6)
1. a noble metal pearl class processing of ornament method, it is characterised in that comprise the following steps:
Step one, product design figure according to the noble metal of required processing, make the diel of press；
Step 2, by the blank of noble metal through roll squeezer be pressed into meet design require lath；
Step 3, on a surface of noble metal lath by magnetron sputtering method, plate last layer titanium film；
Step 4, the noble metal lath in step 3 is carried out recrystallization annealing, to eliminate processing hardening phenomenon, be then curled into pipe fitting with coiling machine, wherein, it is coated with the one of titanium film facing in pipe, the most again two limits is carried out seamless welding, to form circular tube shaped metal tube；
Step 5, metal tube is made annealing treatment, then by metal tube drawing the most step by step on strain plate, until being drawn into the metal tube meeting design size；
Step 6, the metal tube drawn is put in the diel of press, be pressed into required outer shape, obtain the metal tube of pearl shape series winding；
Step 7, the metal tube contacting pearl shape cut, and obtain pearl shape part；
Step 8, the surface clean that carried out by the pearl shape part obtained, then the surface at pearl shape part carries out car flower processing, obtains the pearl shape part of required surface configuration, the most again pearl shape part is carried out titanizing, and method still uses magnetron sputtering method；
Step 9, the pearl shape part obtained is carried out surface clean, then carry out light decorations process by centrifugal finishing machine, after light decorations have processed, place into immersion 1-3h in dehydrated alcohol, finally take out drying, detect examination after drying.
2. noble metal pearl class processing of ornament method as claimed in claim 1, it is characterised in that in step 2, pressing process specifically includes: first make annealing treatment noble metal blank, then noble metal blank is carried out breaking down, after breaking down, noble metal blank is made annealing treatment, after annealing, carries out finish rolling.
3. noble metal pearl class processing of ornament method as claimed in claim 1, it is characterized in that, in step 4, seamless welding uses argon tungsten-arc welding, a diameter of 0.6-1.0mm of tungsten electrode, gage of wire is 1.6mm, welding current is 120-160A, and argon flow amount is 14-18L/min, and nozzle bore is 8-12mm, wire feed rate is 108-117cm/min, to obtain satisfactory weld seam.
4. noble metal pearl class processing of ornament method as claimed in claim 1, it is characterized in that, in step 5, before carrying out drawing, choose the drawing mould of a set of required form size, then one end of metal tube is inserted in pulling eye, metal tube is applied pulling force and is passed to pulling eye, make metal tube pass through the pulling eye that more previous pulling eye aperture is little the most again, to reach progressively deformation, finally give the metal tube meeting design size.
5. noble metal pearl class processing of ornament method as claimed in claim 1, it is characterised in that in step 6, concretely comprising the following steps of pressed metal pipe:
Step 1, the length that the metal tube drawn is saved less than a pearl in the charging aperture feeding of press, the head entrance punching press grinding tool of metal tube；
Step 2, parameter request according to deisgn product, determine the diameter of noble metal pearl class, the pearl joint length obtained, and rotary index during hammer pearl machine hammer pearl is 60 °；
Step 3, startup press, make hammering diel of press, and metal tube produces plastic deformation for the first time；
After the plastic deformation for the first time of step 4, metal tube completes, rotating metallic pipe 60 °, then repeats step 3, until metal tube has turned 360 °；
After step 5, step 4 complete, the press demoulding, the length of a pitch that metal tube is advanced in mould, press matched moulds, use the process for stamping gradually increasing amount of plastic deformation, complete second time necking down and the first time necking down molding of second pearl joint of first pearl joint simultaneously, repeat step 3 to step 4, until completing the molding of whole metal tube, obtain the metal tube of pearl shape series winding.
6. noble metal pearl class processing of ornament method as claimed in claim 1, it is characterised in that in step 9, the pearl shape part obtained is put into the keg of centrifugal finishing machine, starting motor, the major parameter of regulation centrifugal finishing machine, the rotating speed making centrifugal finishing machine is 180-200rad/min.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610275376.2A CN105852340B (en) | 2016-04-29 | 2016-04-29 | A kind of noble metal pearl class processing of ornament method |
| CN201710951630.0A CN107668858A (en) | 2016-04-29 | 2016-04-29 | Noble metal pearl class processing of ornament method |
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| CN201610275376.2A CN105852340B (en) | 2016-04-29 | 2016-04-29 | A kind of noble metal pearl class processing of ornament method |
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| CN201710951630.0A Division CN107668858A (en) | 2016-04-29 | 2016-04-29 | Noble metal pearl class processing of ornament method |
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| CN105852340A true CN105852340A (en) | 2016-08-17 |
| CN105852340B CN105852340B (en) | 2017-12-12 |
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| CN201610275376.2A Expired - Fee Related CN105852340B (en) | 2016-04-29 | 2016-04-29 | A kind of noble metal pearl class processing of ornament method |
| CN201710951630.0A Withdrawn CN107668858A (en) | 2016-04-29 | 2016-04-29 | Noble metal pearl class processing of ornament method |
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| CN106862870A (en) * | 2017-02-17 | 2017-06-20 | 深圳粤通国际珠宝股份有限公司 | A kind of method for processing noble metal |
| CN108618288A (en) * | 2018-05-21 | 2018-10-09 | 深圳市萃华珠宝首饰有限公司 | A kind of bullion processing method |
| CN109263385A (en) * | 2018-09-20 | 2019-01-25 | 广州市飞时达钟表有限公司 | A kind of preparation method of embossment wrist-watch gold dial plate |
| CN109590688A (en) * | 2018-12-11 | 2019-04-09 | 山东梦金园珠宝首饰有限公司 | A kind of ball processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107668858A (en) | 2018-02-09 |
| CN105852340B (en) | 2017-12-12 |
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