CN115156851A - Oil pressure process for manufacturing noble metal ornaments by standard gram weight - Google Patents
Oil pressure process for manufacturing noble metal ornaments by standard gram weight Download PDFInfo
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- CN115156851A CN115156851A CN202210831748.0A CN202210831748A CN115156851A CN 115156851 A CN115156851 A CN 115156851A CN 202210831748 A CN202210831748 A CN 202210831748A CN 115156851 A CN115156851 A CN 115156851A
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- 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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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
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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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
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Abstract
The invention discloses an oil pressure process for manufacturing a standard gram weight of a noble metal ornament, which comprises the following steps: step 1, preparing materials: checking whether the surface of the material is clean and the thickness of the material meets the standard; each cut product is ensured to be complete and not defective; the fire is uniform, the materials are not polluted and are not melted; step 2, pressing piece: a closed oil pressure die is adopted, the die is cleaned and checked, then pressing is carried out through oil pressure, and then the surface of the obtained product is checked; step 3, trimming: cutting off the redundant part to prevent deviation, less cutting and deformation, keeping the sand bottom intact and not dislocating when punching the groove; step 4, punching: punching at a required position to ensure that the hole position is right and the size is moderate; step 5, trimming: the edge of a knife will be scraped cleanly, the surface of the product is guaranteed to be smooth and flat, no hand is scraped, and the lines are even. The process provided by the invention has the advantages of accurate process and easy operation, can ensure the consistent weight of each single product of the same product, and can realize the standard gram integer.
Description
Technical Field
The invention relates to a standard gram weight manufacturing technology of a precious metal ornament, in particular to an oil pressure process for manufacturing the standard gram weight of the precious metal ornament.
Background
In the society at present, the processing and manufacturing technologies of gold ornaments are various, so that the weight of each produced single product is also various, even the weight of single products of the same batch of the same product produced under the same conditions and environment is greatly different, and the weight is also provided with a plurality of decimal places behind the standard gram integer, so that the subsequent processing and classification of the same product are greatly inconvenient, the recorded workload is increased, and errors are easy to occur. For example, gold ornaments sold in the market at present are often found to have the same appearance, size and marked material, but have large weight difference, and some ornaments have a plurality of decimal places with weight behind the standard gram integer. For example, when a ring display is seen in a gold jewelry case, under the condition of the same shape and size, the weight is marked with 8.354 grams, 8.674 grams, 8.253 grams, 8.732 grams, 8.500 grams and the like. When the quantity of the gold ornaments in the special counter is large, the gold ornaments are inconvenient to store, record and display, and the weight of the ornaments can be mixed sometimes.
There is no manufacturing technique that can achieve the same product with the same weight of each individual product consistently in different batches, or an integer of grams? Under the circumstances, a manufacturing technology of the standard gram weight of the gold ornaments is needed to solve the existing problems.
Disclosure of Invention
The invention aims to provide a standard gram weight manufacturing technology for noble metal ornaments, which overcomes the defects of the existing products, has accurate working procedures and easy operation, can ensure that the weight of each single product of the same product is consistent, and can realize a standard gram integer.
In order to achieve the aim, the invention provides an oil pressure process for manufacturing a standard gram weight of a precious metal ornament, wherein the process comprises the following steps: step 1, preparing materials: checking whether the surface of the material is clean and whether the thickness meets the standard; each cut product is ensured to be complete and not defective; the fire is uniform, the materials are not polluted and are not burnt and melted; step 2, pressing piece: a closed oil pressure die is adopted, the die is cleaned and checked, then pressing is carried out through oil pressure, and then the surface of the obtained product is checked; step 3, trimming: cutting off the redundant part to prevent deviation, less cutting and deformation, keeping the sand bottom intact and not dislocating when punching the groove; step 4, punching: punching holes at the required positions of the product to ensure that the hole positions are right and the size is moderate; step 5, trimming: the scraping edge is scraped completely, the surface of the product is smooth and flat, the hand is not scraped, and the lines are uniform.
In the oil pressure process for manufacturing the noble metal ornaments in standard gram weight, in the step 1, whether impurities exist on the surface of the raw material is firstly checked, no borax appears, the surface of a roller of a tablet press is clean, and no other metal exists; when the die is pressed, the surface is kept clean, flat and not bent, and the thickness meets the standard.
According to the oil pressure process for manufacturing the noble metal ornament with the standard gram weight, when the piece is pressed, the thickness of each time is less than or equal to 40mm, and the processing is stopped when the gold explosion occurs.
In the oil pressure process for manufacturing the noble metal ornament with the standard gram weight, in the step 1, the oil pressure process is placed on a fire brick or a fire bowl during firing, the fire brick or the fire bowl is kept clean, and the materials are not dirtied; the fire is uniform, and the material is not burnt and melted; the semi-finished product is evenly tempered.
In the above oil pressure process for manufacturing the noble metal ornament with the standard gram weight, in the step 2, the closed oil pressure die is a closed die in which the upper die and the lower die are both complete and have no open pore.
In the step 2, the die is cleaned during oil pressure, and whether each corner and the back are pressed fully, whether the thickness meets the requirement or not and whether the weight meets the standard or not are checked; the surface of the product after the pressing piece is kept clean without other impurities and stains, the surface of the product is fully pressed during oil pressure, all patterns and corners are complete, and no cracks of a die or a die core exist.
In the oil pressure process for manufacturing the noble metal ornament with the standard gram weight, in the step 3, the die is filled to be correct, so that the excessive parts are cut off, the cutting is avoided, the deformation is avoided, the sand bottom is kept intact, and the grinding is avoided.
In the oil pressure process for manufacturing the noble metal ornaments with the standard gram weight, in the step 3, the ring ornaments are punched on the wider side without dislocation when being grooved, are not too long or too short but are punched at two thirds of the tail of the ring, and the depth of the punch is adjusted to be proper when being grooved.
In the step 5, during trimming, it is ensured that no metal scrap is on the rubber pad below the pad, the scraper forms an angle of 15 degrees with the surface of the product, and the scraped sidelines are smooth and uniform and have no edge.
In the oil pressure process for manufacturing the noble metal ornament with the standard gram weight, in the step 5, when severe burs are generated, the die is trimmed to ensure that the product is clean and complete.
The oil pressure process for manufacturing the standard gram weight of the noble metal ornament, provided by the invention, has the following advantages:
the standard gram weight manufacturing technology for the gold ornaments provided by the invention mainly aims at single standard weight products, can realize batch production with the maximum yield, has accurate process procedures, is easy to operate, can ensure the consistent weight of each single product of the same product in the processing and manufacturing of the gold ornaments, and can realize standard gram integers.
The invention changes the traditional manufacturing process mould, and correspondingly and independently designs a special mould aiming at the closed oil pressure technology. By adopting the closed oil pressure die to replace the existing open oil pressure die, the density and the surface smoothness of the gold ornaments can be better controlled, and a key foundation is laid for the improvement of the products in the next corresponding process high standard processing.
Detailed Description
The following further describes embodiments of the present invention.
The invention provides an oil pressure process for manufacturing standard gram weight of noble metal ornaments, which comprises the following steps: step 1, preparing materials: checking whether the surface of the material is clean and whether the thickness meets the standard; each cut product is ensured to be complete and not defective; the fire is uniform, the materials are not polluted and are not burnt and melted; step 2, pressing piece: a closed oil pressure die is adopted, the die is cleaned and checked, then the pressing piece is carried out through an oil pressure tablet press, and then the surface of the obtained product is checked; step 3, trimming: cutting off the redundant part to prevent deviation, less cutting and deformation, keeping the sand bottom intact and not dislocating when punching the groove; step 4, punching: punching holes at the required positions of the product to ensure that the hole positions are right and the size is moderate; step 5, trimming: the scraping edge is scraped completely, the surface of the product is smooth and flat, the hand is not scraped, and the lines are uniform.
When the product is processed by adopting a punching and shearing mode, the process is as follows: firstly, preparing materials, then punching by an oil-pressure tablet machine, and finally punching.
Preferably, in step 1, the operation and maintenance knowledge of various machine equipment is required to be familiar, and the production safety is ensured. Firstly, checking whether impurities exist on the surface of the raw material, so that borax cannot appear, the surface of a roller of a tablet press is clean, and no other metal exists; when the die is pressed, the surface is kept clean, flat and not bent, and the thickness meets the standard.
When the die is pressed, the thickness of each time is less than or equal to 40mm, and the machining is stopped when the metal explosion occurs.
In the step 1, the material is placed on a fire brick or in a fire bowl during firing, and the fire brick or the fire bowl is kept clean without dirtying the material; the fire is uniform, and the material is not burnt and melted; the semi-finished product is evenly tempered.
In the step 2, the closed oil pressure die is a closed die with an upper die and a lower die which are both complete and are not provided with openings.
The closed oil pressure die is adopted to replace the existing open oil pressure die with holes on the die, so that the density and the surface smoothness of the gold ornaments can be better controlled, and corresponding oil press matching equipment and core parameters are matched, thereby completing more scientific modern production and batch manufacturing.
In step 2, cleaning the die during oil pressure, checking whether each corner and back are pressed fully, whether the thickness meets the requirement, and whether the weight meets the standard; the product surface after the pressing piece is kept clean without other impurities and stains, and the product surface is pressed fully under oil pressure, all patterns and corners are complete, and no cracks of a die or a die core exist.
In the step 3, the die is filled normally, so that when the redundant parts are cut off, the phenomena of partial cutting, less cutting and deformation are avoided, the sand bottom is kept intact, and the frosting is avoided.
In step 3, the ring ornaments are punched on the wider side without dislocation when being grooved, are not too long or too short, but are punched on two thirds of the tail of the ring, and the depth of the punch is adjusted to be proper when the ring ornaments are grooved.
And 5, during trimming, ensuring that no broken metal exists on the rubber pad below the pad, forming an angle of 15 degrees between the scraper and the surface of the product, and ensuring that the scraped sidelines are smooth and uniform and have no burrs.
And 5, trimming the die when serious burrs are generated so as to ensure that the product is clean and complete.
The burrs are also called flash, burr and the like, and are not part of the design requirement of the die, namely, the excessive useless objects.
The equipment and other process conditions employed in the present invention are known to those skilled in the art.
The oil pressure process for manufacturing the noble metal ornament with the standard gram weight is further described with reference to the following embodiments.
Example 1
An oil pressure process for manufacturing a standard gram weight of a precious metal ornament takes ring manufacturing as an example, and the process comprises the following steps:
step 1, preparing materials: checking whether the surface of the material is clean and whether the thickness meets the standard; each cut product is ensured to be complete and not defective; the fire is even, the material is not polluted and is not burnt and melted.
In the process, the operation and maintenance knowledge of various machine equipment needs to be familiar, and the production safety needs to be paid attention.
Before pressing the piece, the surface of the gold bar is firstly checked whether impurities exist, no borax appears, and the surface of a roller of a tablet press is clean and free of other metals.
When the part is pressed, the surface is kept clean, flat and not bent, and the thickness is standard; the thickness of each tabletting can not exceed 40mm, and the processing is stopped immediately when the gold explosion occurs.
The cutting must ensure that each product is complete and not defective.
When in firing, the material is placed on a firing brick or in a firing bowl, the firing brick or the firing bowl must be kept clean, the material cannot be polluted, the firing is uniform, and the material cannot be fired; the fired semi-finished product must be tempered uniformly.
Step 2, pressing piece: and (3) adopting a closed oil pressure mould, cleaning the mould, checking, pressing the part by oil pressure, and checking the surface of the obtained product.
The closed oil pressure die is a closed die with an upper die and a lower die which are both complete and are not provided with openings.
Cleaning the die during oil pressure, checking whether each corner and back are pressed fully, and whether the thickness meets the requirement; the weight standard is required to be reached when the finger ring is pressed.
The ring surface after the pressing piece is kept clean without other impurities and stains; the finger ring surface is pressed to be full, namely all patterns and corners are complete; the ring table cannot have cracks of the ring mold or the mold core.
Step 3, trimming: the redundant parts are cut off to prevent deviation, less cutting and deformation, the sand bottom is kept intact, and dislocation is avoided during grooving.
The die is just installed during trimming, the phenomena of partial trimming, less trimming, deformation and the like are prevented, and the sand bottom is kept intact and cannot be ground.
The ring ornaments can not be beaten in a staggered manner when being slotted, and can not be beaten on a wider surface, and can not be beaten too long or too short, and about two thirds of the ring tail can be beaten, and the depth of a punch is adjusted to be moderate when being slotted.
Step 4, punching: punching is carried out at the required position of the product, so that the hole position is ensured to be right and the size is moderate.
Step 5, trimming: the phenomenon that the back surface and the side surface cannot be scratched when the edge of the batch needs to be scratched completely is noticed; after scraping, the lines should be uniform.
During trimming, the rubber pad below the pad is ensured not to have broken metal so as to avoid scratching the surface of the product. The scraper and the surface of the product form an angle of 15 degrees, the scraped edges are uniform, the lines are smooth, and no edge can be cut.
When severe edge chipping occurs, the mold needs to be trimmed to ensure that the product is clean and complete.
Example 2
An oil pressure process for manufacturing standard gram weight of precious metal ornaments takes manufacturing of a tag as an example, and the process comprises the following steps:
step 1, preparing materials: checking whether the surface of the material is clean and whether the thickness meets the standard; each cut product is ensured to be complete and not defective; the fire is even, the material is not polluted and is not burnt and melted.
Step 2, pressing piece: and (3) adopting a closed oil pressure mould, cleaning the mould, checking, pressing the part by oil pressure, and checking the surface of the obtained product.
Step 3, trimming: the redundant parts are cut off to prevent deviation, less cutting and deformation, the sand bottom is kept intact, and dislocation is avoided during grooving.
Step 4, punching: punching is carried out at the required position of the product, so that the hole position is ensured to be right and the size is moderate.
Step 5, trimming: the scraping edge is scraped completely, the surface of the product is smooth and flat, the hand is not scraped, and the lines are uniform.
And finally, installing a buckling ring at the punching position of the hanging tag and completing ring welding.
Wherein, when the tablet is pressed and polished, the tablet press must be wiped clean, and the pressed tablet can not have impurities or dirty marks.
When the mirror surface tablet press is used for tabletting, the machine (roller) and materials need to be wiped clean, and the extruded tablets need to be bright and clean and cannot have impurities thereon.
When cutting, the die is wiped clean, the cut material is kept bright and clean, and oil stains, finger marks and the like cannot be formed on the surface of the cut material.
When the mold is polished, the mold is firstly wiped clean and needs to be careful, the mold slowly moves at the center of the left hand, the swing arc of the velvet piece controlled by the right hand cannot be too large, and the mirror surface needs to be bright after polishing, so that the velvet piece cannot be polished to a sand surface.
The extruded product has bright mirror surface, no bright spot on the sand surface and good protection, and the product with special requirements is produced according to a single method.
During trimming, care should be taken to ensure that the trimming cannot be deviated, the brightness of the mirror surface is protected, the sand surface cannot be touched to be bright, and the product needs to be put lightly. Special products must also be protected on the back.
The scraping edge is even, lines are smooth, and the scraping edge cannot be cut off or pressed to the side surface. The product can not be stacked again, and needs to be laid out and lightly handled.
The car flower hanging tag needs to check whether a car is damaged (damaged in batches) or not, and then the front of the car flower is trimmed to be clean.
The fastening ring interface needs to be tight and not deformed, and the product needs to be lightly held and placed, so that the mirror surface and the sand surface are well protected.
When a ring is welded, the product needs to be lightly placed on a welding plate, the interface cannot be welded to collapse, a groove cannot be formed after welding, the product needs to be smooth and round, and the product needs to be lightly placed after welding to protect a mirror surface and a sand surface.
The processed product meets the following quality standards:
1. the material is required to be clean when the material is prepared, and the mirror surface is required to be kept good;
2. punching a finished product: the product is clean and complete without serious edge scraping (if the edge is required to be repaired), the oil pressure is required to be fully pressed, the mirror surface is bright, and the sand bottom has no bright mark;
3. the edge cutting edge can not be too large, and the edge is required to be cut rightly;
4. the size of the punched hole is moderate, and the hole position is right;
5. edge scraping and trimming are carried out, the edge scraping needs to be clean, the back and the side cannot be scraped by hands, and lines are uniform after edge scraping;
6. punching and shearing the bottom sheet and the hanging flower in the same plane: the surface is smooth and has no unfilled corners; the circumference of the hollow mouth surface is equal.
7. The opening of the buckling ring needs to be fastened and is not deformed, the welding opening of the welding ring cannot be too large, the radian of the circle is kept as much as possible, and black marks cannot be formed after welding;
8. the thickness of the needle behind the hammer needle is uniform, no sharp points exist, the needle cannot be knocked and exploded, and the needle cannot be too deep or too shallow, and has the same angle with a finished product.
9. When the ear ring is rolled, the ear ring must be rolled into a circle, the center line is accurate, and the two sides are parallel; the pressing depth is moderate, and the pressing cannot be too tight or too deep;
10. the shapes of the products such as the radish core and the hollow suspended flower are required to be in accordance with the shape of a mould, the radish noodle is full, the surface cannot be concave-convex, the edge cutting is required to be correct, and the bottom edge is required to be uniform and flat;
11. the ball should be rounded, and there is no trace left by the mold and no gap.
12. During punching and shearing of the continuously formed hanging flower or hanging nozzle, the material must be pulled in place so as to avoid deformation and unfilled corners of the product.
13. The mirror surface and the sand surface of the product are protected; the character is clear and has moderate depth.
The oil pressure process for manufacturing the standard gram weight of the noble metal ornaments, provided by the invention, has the advantages of precise working procedures and easiness in operation, the processing and manufacturing technology can achieve the aim that the same product can always keep the weight of each single product consistent in different batches of production, or the weight of each single product reaches an integer gram, and the batch production with the maximum yield can be realized for the single product with the standard weight.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. An oil pressure process for manufacturing a noble metal ornament with standard gram weight is characterized by comprising the following steps:
step 1, preparing materials: checking whether the surface of the material is clean and whether the thickness meets the standard; each cut product is ensured to be complete and not defective; the fire is uniform, the materials are not polluted and are not burnt and melted;
step 2, pressing piece: a closed oil pressure die is adopted, the die is cleaned and checked, then pressing is carried out through oil pressure, and then the surface of the obtained product is checked;
step 3, trimming: cutting off the redundant part to prevent deviation, less cutting and deformation, keeping the sand bottom intact and not dislocating when punching the groove;
step 4, punching: punching holes at the required positions of the product to ensure that the hole positions are right and the size is moderate;
step 5, trimming: the scraping edge is scraped completely, the surface of the product is smooth and flat, the hand is not scraped, and the lines are uniform.
2. The oil pressure process for manufacturing the standard gram weight of the noble metal ornaments according to claim 1, wherein in the step 1, whether impurities exist on the surface of the raw material is firstly checked, borax cannot appear, the surface of a roller of a tablet press is clean, and no other metal exists; when the die is pressed, the surface is kept clean, flat and not bent, and the thickness meets the standard.
3. The oil pressure process for manufacturing the standard gram weight of the noble metal ornaments according to claim 2, wherein the thickness of each time of pressing is less than or equal to 40mm, and the machining is stopped when the gold explosion occurs.
4. The oil pressure process for manufacturing the standard gram weight of the noble metal ornaments according to the claim 2, wherein in the step 1, the oil pressure process is carried out, the oil pressure process is put on a firing brick or a firing bowl during firing, the firing brick or the firing bowl is kept clean, and the materials are not polluted; the fire is uniform, and the material is not burnt and melted; the semi-finished product is evenly tempered.
5. The oil pressure process for manufacturing the noble metal ornament with the standard gram weight as claimed in claim 1, wherein in the step 2, the closed oil pressure die is a closed die with an upper die and a lower die which are both complete and are not provided with openings.
6. The oil pressure process for manufacturing the standard gram weight of the noble metal ornaments according to the claim 5, wherein in the step 2, the die is cleaned firstly during oil pressure, whether each corner and the back are pressed fully, whether the thickness meets the requirement or not and whether the weight meets the standard or not are checked; the product surface after the pressing piece is kept clean without other impurities and stains, and the product surface is pressed fully under oil pressure, all patterns and corners are complete, and no cracks of a die or a die core exist.
7. The oil pressure process for manufacturing the noble metal ornament with the standard gram weight as claimed in claim 1, wherein in the step 3, the die is filled in a positive mode, so that the excessive part is cut off, the bias cutting, the small cutting and the deformation are avoided, the sand bottom is kept intact, and the frosting is avoided.
8. The oil pressure process for manufacturing the standard gram weight of the precious metal ornaments according to claim 7, wherein in the step 3, the ring ornaments are punched on the wider side without dislocation during slotting, are not too long or too short, but are punched at two thirds of the tail of the ring, and the depth of the punch is adjusted to be moderate during slotting.
9. The oil pressure process for manufacturing the standard gram weight of the precious metal ornaments, according to the claim 1, wherein in the step 5, the rubber mat below the mat is ensured not to have broken metal during trimming, a scraper forms an angle of 15 degrees with the surface of a product, and the scraped side lines are smooth and uniform and have no burrs.
10. The oil pressure process for manufacturing the standard gram weight of the noble metal ornaments according to the claim 9, wherein in the step 5, when severe burrs are generated, the die is trimmed to ensure that the product is clean and complete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210831748.0A CN115156851A (en) | 2022-07-15 | 2022-07-15 | Oil pressure process for manufacturing noble metal ornaments by standard gram weight |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210831748.0A CN115156851A (en) | 2022-07-15 | 2022-07-15 | Oil pressure process for manufacturing noble metal ornaments by standard gram weight |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641495A (en) * | 2004-01-14 | 2005-07-20 | 吴国义 | Watch case made of gold more than 98% and its manufacturing process |
| KR100688234B1 (en) * | 2005-11-25 | 2007-03-02 | 김영오 | Manufacturing method of precious metal-plate with wild surface |
| CN101239436A (en) * | 2008-03-20 | 2008-08-13 | 深圳市金龙珠宝首饰有限公司 | Gold bar sand spraying technique |
| CN106541251A (en) * | 2015-09-17 | 2017-03-29 | 崔志向 | Do not circulate the manufacture method of grade noble metal products |
| CN107716822A (en) * | 2017-09-30 | 2018-02-23 | 南京阖天下黄金珠宝股份有限公司 | A kind of oil pressure gold bar manufacture craft |
-
2022
- 2022-07-15 CN CN202210831748.0A patent/CN115156851A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641495A (en) * | 2004-01-14 | 2005-07-20 | 吴国义 | Watch case made of gold more than 98% and its manufacturing process |
| KR100688234B1 (en) * | 2005-11-25 | 2007-03-02 | 김영오 | Manufacturing method of precious metal-plate with wild surface |
| CN101239436A (en) * | 2008-03-20 | 2008-08-13 | 深圳市金龙珠宝首饰有限公司 | Gold bar sand spraying technique |
| CN106541251A (en) * | 2015-09-17 | 2017-03-29 | 崔志向 | Do not circulate the manufacture method of grade noble metal products |
| CN107716822A (en) * | 2017-09-30 | 2018-02-23 | 南京阖天下黄金珠宝股份有限公司 | A kind of oil pressure gold bar manufacture craft |
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