Additive manufacturing method for precious metal products and precious metal products
The described method improves additive manufacturing efficiency and reduces costs by directly producing complex precious metal products through photocuring 3D printing and post-processing, addressing inefficiencies in traditional casting methods.
Patent Information
- Application Number
- CN202310248379.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-03-15
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2043-03-15
AI Technical Summary
Existing additive manufacturing methods for precious metal products are inefficient and costly, relying on traditional casting processes that require mold making and result in low production efficiency and high costs.
A method involving the preparation of precious metal slurry using photosensitive resin, dispersant, and precious metal powder, followed by 3D printing, cleaning, degreasing, sintering, and polishing to directly produce complex precious metal products without molds, utilizing photocuring additive manufacturing.
This method enhances manufacturing efficiency, reduces costs, and allows for the production of lightweight, high-strength products with complex structures, achieving up to 30% reduction in precious metal usage while maintaining strength and enabling personalized customization.
Smart Images
Figure CN116197408B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of precious metal additive manufacturing, and in particular to an additive manufacturing method for precious metal products and precious metal products. Background Art
[0002] Additive manufacturing technology is a technology that uses data design to manufacture entities by adding materials layer by layer. This method can not only achieve mass production of the same model / different models, greatly saving time and materials, but also greatly improve the success rate in the process of complex structure processing.
[0003] The existing additive manufacturing method for precious metal products is a packaging of traditional casting technology. In essence, it uses additive manufacturing technology to make an organic model, and then obtains the final product through mold remodeling. It still belongs to the category of casting process. The specific steps are to make the precious metal product into a wax model or other resin model through additive manufacturing, and then pour high-temperature resistant materials on the surface of the wax model to form a complete shell, and then melt the wax model to form a cavity, and then burn the silver to melt and cast it into the cavity, and then go through demolding, deburring, polishing and other processes to obtain the final product. However, this manufacturing method has low production efficiency and high cost. Summary of the invention
[0004] The present application provides an additive manufacturing method for a precious metal product and a precious metal product, which can improve the efficiency of additive manufacturing of the precious metal product and reduce the cost of additive manufacturing of the precious metal product.
[0005] In a first aspect of an embodiment of the present application, a method for additive manufacturing of a precious metal product is provided, the method comprising:
[0006] Precious metal slurry is prepared by using photosensitive resin, dispersant, anti-settling agent and precious metal powder;
[0007] Placing the precious metal slurry as a 3D printing material for precious metal products in a light-curing 3D printer;
[0008] Print the precious metal slurry according to the simulation model of the precious metal product preset in the light-curing 3D printer until a green embryo model of the precious metal product is generated;
[0009] The green model is cleaned, degreased, sintered and polished in sequence to obtain the printed precious metal product.
[0010] In one embodiment, a precious metal slurry is prepared by using a photosensitive resin, a dispersant, an anti-settling agent and a precious metal powder, including:
[0011] Mixing a photosensitive resin, a dispersant and an anti-settling agent to obtain an organic mixture;
[0012] The precious metal powder is added to the organic mixture to obtain a precious metal slurry.
[0013] In one embodiment, printing the precious metal paste includes:
[0014] Print precious metal paste under preset conditions;
[0015] The default condition is: the exposure of the light-curing 3D printer is 15-25mw / cm 2 The number of printed bottom layers is 3 to 9, the bottom exposure time is 6 to 12 seconds, and the normal exposure time is 3 to 6 seconds.
[0016] In one embodiment, the green model is sequentially cleaned, degreased, sintered and polished to obtain a printed precious metal product, including:
[0017] The green embryo model is placed in an alcohol solution for ultrasonic cleaning for 5 to 20 minutes, then taken out and placed in an oven for drying, and the weight of the green embryo model is weighed;
[0018] Repeat the above execution process until the weight difference between the weight of the raw embryo model and the weight of the raw embryo model after drying is less than a preset weight, thereby obtaining a cleaned raw embryo model;
[0019] The cleaned green model is sequentially subjected to degreasing, sintering and polishing processes to obtain a printed precious metal product.
[0020] In one embodiment, the cleaned green model is subjected to degreasing, sintering and polishing treatments in sequence to obtain a printed precious metal product, including:
[0021] The cleaned green embryo model is placed in a hot air degreasing furnace until the surface of the cleaned green embryo model is the color of the precious metal, thereby obtaining a degreased green embryo model;
[0022] The degreased green model is sintered and polished to obtain a printed precious metal product.
[0023] In one embodiment, the degreased green model is sintered and polished to obtain a printed precious metal product, including:
[0024] The degreased green model is cooled to room temperature and then embedded in ceramic powder to obtain a filled green model;
[0025] The filled green embryo model is placed in a muffle furnace for sintering treatment, and then placed in water for quenching treatment to obtain a sintered green embryo model. The sintering treatment is carried out by heating the temperature to 850-910°C at a rate of 2°C / min and then keeping the temperature for 30min-60min.
[0026] The sintered green model is polished to obtain a printed precious metal product.
[0027] In one embodiment, the sintered green model is polished to obtain a printed precious metal product, including:
[0028] The sintered green model is placed in a magnetic polishing machine, and pure water is added into the magnetic polishing machine for polishing to obtain a primary polished model;
[0029] The first polished model is subjected to mirror polishing or frosted polishing to obtain a printed precious metal product.
[0030] In one embodiment, mirror polishing is performed on a primary polishing model, including:
[0031] The primary polished model is placed in a drum polishing machine for mirror polishing;
[0032] The drum polishing machine includes ceramic balls, the particle size of the ceramic balls is 1mm to 1.5mm, the number of the ceramic balls is determined according to the volume of a polishing model, and the polishing time is 30 to 60 minutes.
[0033] In one embodiment, the frosted surface of the primary polishing model is polished, including:
[0034] The once-polished model is placed in a drum polisher for frosted surface polishing;
[0035] The drum polishing machine includes ceramsite balls, the particle size of the ceramsite balls is 0.1mm-0.5mm, the number of the ceramsite balls is determined according to the volume of a polishing model, and the polishing time is 30-60min.
[0036] A second aspect of the embodiments of the present application provides a precious metal product, which is prepared by the additive manufacturing method for the precious metal product in the first aspect of the embodiments of the present application.
[0037] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:
[0038] The additive manufacturing method for precious metal products provided in the embodiments of the present application is an additive manufacturing technology that applies the principle of photocuring additive manufacturing to precious metal materials, and prepares precious metal slurry by using photosensitive resin, dispersant, anti-settling agent and precious metal powder to perform photocuring additive manufacturing of precious metal materials, which can realize direct three-dimensional molding of complex components without making molds or reverse mold blanks. Compared with the complex process of mold turning technology and the low manufacturing efficiency and low precision of laser cladding additive manufacturing technology, the additive manufacturing method for precious metal products provided in the present application has higher manufacturing efficiency and lower cost.
[0039] At the same time, the additive manufacturing method for precious metal products provided in this application can directly manufacture silver jewelry with complex structures such as high hollowing out and overlapping, and the complexity of the product has no correlation with the manufacturing cost, which can overcome the disadvantages of traditional manufacturing methods that products can be manufactured with low manufacturing complexity and the complexity is proportional to the manufacturing cost.
[0040] Furthermore, the present application can achieve light weight and high strength in the prepared precious metal products through the design of internal microporous structure. Under the same volume, the amount of precious metal can be reduced by 20% to 30%, which can reduce costs and improve the strength of the product at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Figure 1 A flow chart of an additive manufacturing method for a precious metal product provided in an embodiment of the present application;
[0042] Figure 2 A schematic diagram of a Big Wild Goose Pagoda simulation model provided in an embodiment of the present application;
[0043] Figure 3 A schematic diagram of a transfer bead simulation model provided in an embodiment of the present application. DETAILED DESCRIPTION
[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0045] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.
[0046] Additionally, the use of “based on” or “according to” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” or “according to” one or more conditions or values may, in practice, be based on additional conditions or beyond values.
[0047] like Figure 1 As shown, an embodiment of the present application provides an additive manufacturing method for a precious metal product, the method comprising the following steps:
[0048] Step 101: Prepare precious metal slurry by using photosensitive resin, dispersant, anti-settling agent and precious metal powder.
[0049] Among them, the precious metal powder can be silver powder, gold powder, platinum powder, etc., which is not specifically limited in the embodiments of the present application.
[0050] Optionally, the photosensitive resin, the dispersant and the anti-settling agent may be mixed to obtain an organic mixture, and then the noble metal powder may be added to the organic mixture to obtain a noble metal slurry.
[0051] Step 102: placing the precious metal slurry as a 3D printing material for a precious metal product in a light-curing 3D printer.
[0052] Among them, the photocuring 3D printing technology is to selectively cure the photosensitive resin layer by layer by controlling the ultraviolet light beam through a computer, and control the displacement of the platform in the z-axis direction, and cure the next layer of photosensitive resin on the previous cured layer, thereby completing the production of 3D printed parts.
[0053] Step 103: Print the precious metal slurry according to the simulation model of the precious metal product preset in the light-curing 3D printer until a green model of the precious metal product is generated.
[0054] Among them, the green model refers to the precious metal product directly printed by the light-curing 3D printer. The directly printed precious metal product needs to be cleaned, degreased, sintered and polished before the final precious metal product can be obtained.
[0055] It should be noted that a simulation model of precious metal products needs to be established in advance, and the size of the simulation model should be proportionally enlarged by 1.3 to 1.6 times in combination with the actual shrinkage. Then the model file is imported into the light-curing 3D printer, and the model is sliced. The slice thickness should be controlled at 30 to 50 μm / layer, and then printed.
[0056] Optionally, the printing conditions for printing precious metal slurry are: the exposure of the light-curing 3D printer is 15 to 25 mw / cm 2 The number of printed bottom layers is 3 to 9, the bottom exposure time is 6 to 12 seconds, and the normal exposure time is 3 to 6 seconds.
[0057] Step 104 , the green model is sequentially cleaned, degreased, sintered and polished to obtain a printed precious metal product.
[0058] Among them, cleaning is mainly to clean the uncured slurry in the printed green model, degreasing is used to remove organic matter in the green model, so that only precious metal materials are retained in the green model. Sintering is to increase the strength of the product. Polishing can provide the beauty of the product.
[0059] Optionally, the process of cleaning the green embryo model may be:
[0060] The green embryo model is placed in an alcohol solution for ultrasonic cleaning for 5 to 20 minutes, then taken out and placed in an oven for drying. The weight of the green embryo model is weighed, and the above execution process is repeated until the weight difference between the weight of the green embryo model and the weight of the dried green embryo model is less than the preset weight, thereby obtaining a cleaned green embryo model. The cleaned green embryo model is sequentially degreased, sintered and polished to obtain a printed precious metal product.
[0061] The ultrasonic frequency during ultrasonic cleaning is 30-35 Hz. The preset weight may be that the weight difference between the weight of the raw embryo model and the weight of the raw embryo model after drying is less than 0.5% of the weight of the raw embryo model before cleaning. For example, if the raw embryo model weighs 100 g before cleaning and 99 g after cleaning, then the preset weight is 1%.
[0062] In the actual implementation process, the printed and solidified green model is removed from the printer, placed in a 50% alcohol solution, ultrasonically cleaned for 5 to 20 minutes, taken out, and then placed in an oven at 80°C for drying, and its weight is weighed. Then the above steps are repeated until the difference between the last weighing weight and the previous weight is less than 0.5%, and it is considered that the internal uncured slurry has been cleaned and the cleaning is completed.
[0063] Optionally, the process of degreasing the cleaned green mold may be:
[0064] The cleaned green model is placed in a hot air degreasing furnace until the surface of the cleaned green model is the color of the precious metal, thereby obtaining a degreased green model. The degreased green model is then sintered and polished to obtain a printed precious metal product.
[0065] In the actual implementation process, the cleaned green model can be placed in a hot air degreasing furnace. Each time the temperature is kept warm, the sample surface is uniformly colored with precious metals and has no brown, yellow or black organic matter as a reference indicator.
[0066] Optionally, the process of sintering the degreased green mold may be:
[0067] The degreased green model is cooled to room temperature and then embedded in ceramic powder to obtain a filled green model. The filled green model is then placed in a muffle furnace for sintering and then placed in water for quenching to obtain a sintered green model. The sintering process is performed by heating the temperature to 850-910°C at a rate of 2°C / min and then keeping the temperature for 30-60 minutes. Finally, the sintered green model is polished to obtain a printed precious metal product.
[0068] In the actual implementation process, the degreased green model can be cooled to room temperature in the air, and then the sample can be buried in ceramic powder so that the powder can fully fill the sample gaps. It is then placed in a muffle furnace for sintering, and the temperature is raised from room temperature to 850-910°C at a rate of 2°C / min. The sample is kept warm for 30min-60min, and then the sample is taken out and quickly placed in water for quenching.
[0069] Optionally, the process of polishing the green mold after sintering may be:
[0070] The sintered green model is placed in a magnetic polishing machine, and pure water is added to the magnetic polishing machine for polishing to obtain a primary polishing model, and then the primary polishing model is mirror polished or frosted polished to obtain a printed precious metal product.
[0071] Among them, the process of mirror polishing the single-polished model can be: placing the single-polished model in a drum polishing machine for mirror polishing; the drum polishing machine includes ceramic balls, the particle size of the mirror-polished ceramic balls is 1mm~1.5mm, the number of ceramic balls is determined according to the volume of the single-polished model, and the polishing time is 30~60min.
[0072] The process of frosted polishing of a single polished model can be:
[0073] The primary polishing model is placed in a drum polishing machine for frosted surface polishing, wherein the drum polishing machine includes ceramsite balls, the particle size of the ceramsite balls for frosted surface polishing is 0.1mm-0.5mm, the number of ceramsite balls is determined according to the volume of the primary polishing model, and the polishing time is 30-60min.
[0074] In the actual implementation process, the quenched sample can be placed in a magnetic polisher, and pure water is added to the polisher until the liquid level just covers all samples and magnetic needles. The polishing time is 30 minutes to 120 minutes; then the sample is taken out and mirror or frosted polishing is performed according to different needs. Mirror polishing: Place the sample in a drum polisher, add ceramsite balls, the particle size is controlled at 1mm to 1.5mm, and the number is controlled to just cover all samples. The polishing time is 30 to 60 minutes. Frosted surface polishing: Place the sample in a drum polisher, add ceramic balls, the particle size is controlled at 0.1mm to 0.5mm, and the number is controlled to just cover all samples. The polishing time is 30 to 60 minutes; then take out the sample and dry it.
[0075] The additive manufacturing method for precious metal products provided in the embodiments of the present application eliminates the complex process, high cost and long processing cycle brought by the traditional lost wax casting. At the same time, personalized customized products can be industrialized, that is, a single batch of industrialized production of multiple samples with different structures can be achieved, greatly improving production efficiency; in addition, the product manufacturing accuracy and complex structure compatibility of the product prepared by the method of the present application are improved, because the method of the present application can meet the production of various nested structures that cannot be completed by hand and the processing accuracy is about 30 to 50 μm, which is significantly improved compared with the traditional precious metal product processing method. Furthermore, the precious metal products prepared by the method of the present application are lightweight and high-strength, based on the production of complex structures, and can be improved through the internal hollow support structure on the basis of reducing the amount of precious metals, meet the wearing requirements, and reduce the product price.
[0076] An embodiment of the present application also provides a precious metal product, which is prepared by the above-mentioned additive manufacturing method for precious metal products.
[0077] The embodiment of the present application provides a specific process of an additive manufacturing method for a silver Big Wild Goose Pagoda product.
[0078] (1) Preparation of raw materials: silver powder, photosensitive resin, dispersant, and anti-settling agent are added to a container in sequence, stirred for 2 hours to form a silver-containing slurry, and placed in a light-curing 3D printer. The slurry volume is about 2 L; the silver powder mass accounts for 80 wt%, the photosensitive resin 18.2 wt%, the anti-settling agent (BYK-410) 0.8 wt%, and the dispersant (BYK-3500) 1 wt%.
[0079] (2) Model making: Use 3Dmax to build the target model, with a hollowing degree of 83% and a minimum line thickness of 2mm. The target length, width and height of the product are 0.7cm, 0.7cm and 2.0cm, and the linear shrinkage of the green body is 30%. The corresponding length, width and height of the model are enlarged by 1.43 times, that is, the length, width and height are 1.0cm, 1.0cm and 2.9cm. Figure 2 As shown, a schematic diagram of a Big Wild Goose Pagoda simulation model is provided.
[0080] (3) Model printing: Import the model file into the light-curing 3D printer, slice the model, and the slice thickness should be controlled at 50 μm / layer, and then print it.
[0081] (4) Cleaning: Remove the solidified green body from the printer, place it in a 50% alcohol solution, and ultrasonically clean it for 10 minutes before taking it out. Weigh it. Repeat the above steps until the difference between the last weighing and the previous weight is less than 0.5%. It is considered that the uncured slurry inside has been cleaned and the cleaning is complete.
[0082] (5) Degreasing: The cleaned green model is removed from the printer and placed in a hot air degreasing furnace. The degreasing process is as follows: the temperature is raised from room temperature to 180°C at a rate of 2°C / min and kept at this temperature for 3 hours for the purpose of drying; then the temperature is raised to 230°C at a rate of 0.5°C / min and kept at this temperature for 3 hours, then the temperature is raised to 280°C at a rate of 0.5°C / min and kept at this temperature for 3 hours, then the temperature is raised to 330°C at a rate of 0.5°C / min and kept at this temperature for 3 hours, then the temperature is raised to 360°C at a rate of 0.5°C / min and kept at this temperature for 3 hours, then the temperature is raised to 390°C at a rate of 0.5°C / min and kept at this temperature for 1 hour. The reference index for each time of keeping the temperature is that the surface of the sample is uniformly grayish white and there is no brown, yellow or black organic matter.
[0083] (6) Pre-sintering: The degreased green body is placed in a muffle furnace, heated from room temperature to 550°C at a rate of 2°C / min, and kept at this temperature for 30 min for pre-sintering.
[0084] (7) Sintering: Take out the sample, cool it to room temperature in air, and then bury the sample in ceramic powder so that the powder can fully fill the sample gaps. Then place it in a muffle furnace for sintering. Raise the temperature from room temperature to 880°C at a rate of 2°C / min and keep it at that temperature for 60 min. Then take out the sample and quickly place it in water for quenching.
[0085] (8) Polishing: Place the quenched sample in a magnetic polisher, add pure water to the polisher until the liquid level just covers all the samples and the magnetic needles, and polish for 30 minutes; then take out the sample, and place it in a drum polisher, add water and ceramic balls with a particle size of 0.3 mm, and polish for 30 minutes; then take out the sample and dry it to obtain a silver frosted hollow Big Wild Goose Pagoda.
[0086] The embodiment of the present application also provides a specific process of an additive manufacturing method for a silver transfer bead product.
[0087] (1) Preparation of raw materials: silver powder, photosensitive resin, dispersant, and anti-settling agent are added to a container in sequence, stirred for 2 hours to form a silver-containing slurry, and placed in a light-curing 3D printer. The slurry volume is about 2 L; the silver powder mass accounts for 80 wt%, the photosensitive resin 18.2 wt%, the anti-settling agent (BYK-410) 0.8 wt%, and the dispersant (BYK-3500) 1 wt%.
[0088] (2) Model making: Use 3Dmax to build the target model, with a hollowing degree of 75% and a minimum line thickness of 1mm; the target product diameter is 1cm, the linear shrinkage of the green body is 30%, and the corresponding diameter of the model is enlarged by 1.43 times, i.e. 1.43cm. Figure 3 As shown, a schematic diagram of a transport bead simulation model is provided.
[0089] (3) Model printing: Import the model file into the light-curing 3D printer, slice the model, and the slice thickness should be controlled at 50 μm / layer, and then print it.
[0090] (4) Cleaning: Remove the solidified green body from the printer, place it in a 50% alcohol solution, and ultrasonically clean it for 10 minutes before taking it out. Weigh it. Repeat the above steps until the difference between the last weighing and the previous weight is less than 0.5%. It is considered that the uncured slurry inside has been cleaned and the cleaning is complete.
[0091] (5) Degreasing: The cleaned green model is removed from the printer and placed in a hot air degreasing furnace. The degreasing process is as follows: the temperature is raised from room temperature to 180°C at a rate of 2°C / min and kept at this temperature for 3 hours for the purpose of drying; then the temperature is raised to 230°C at a rate of 1°C / min and kept at this temperature for 2 hours, then the temperature is raised to 280°C at a rate of 1°C / min and kept at this temperature for 2 hours, then the temperature is raised to 330°C at a rate of 1°C / min and kept at this temperature for 2 hours, then the temperature is raised to 360°C at a rate of 1°C / min and kept at this temperature for 2 hours, then the temperature is raised to 390°C at a rate of 1°C / min and kept at this temperature for 1 hour. The reference index for each time of keeping the temperature is that the surface of the sample is uniformly grayish white and there is no brown, yellow or black organic matter.
[0092] (6) Pre-sintering: The degreased green body is placed in a muffle furnace, heated from room temperature to 550°C at a rate of 2°C / min, and kept at this temperature for 30 min for pre-sintering.
[0093] (7) Sintering: Take out the sample, cool it to room temperature in air, and then bury the sample in ceramic powder so that the powder can fully fill the sample gaps. Then place it in a muffle furnace for sintering. Raise the temperature from room temperature to 880°C at a rate of 2°C / min and keep it at that temperature for 60 min. Then take out the sample and quickly place it in water for quenching.
[0094] (8) Polishing: Place the quenched sample in a magnetic polisher, add pure water to the polisher until the liquid level just covers all the samples and the magnetic needles, and polish for 30 min. Then take out the sample and place it in a drum polisher. Add water and ceramic balls with a particle size of 1.5 mm. Polish for 30 min. Then take out the sample and dry it to obtain a silver mirror hollow transfer bead.
[0095] The additive manufacturing method for precious metal products provided in the embodiments of the present application is an additive manufacturing technology that applies the principle of photocuring additive manufacturing to precious metal materials, and prepares precious metal slurry by using photosensitive resin, dispersant, anti-settling agent and precious metal powder to perform photocuring additive manufacturing of precious metal materials, which can realize direct three-dimensional molding of complex components without making molds or reverse mold blanks. Compared with the complex process of mold turning technology and the low manufacturing efficiency and low precision of laser cladding additive manufacturing technology, the additive manufacturing method for precious metal products provided in the present application has higher manufacturing efficiency and lower cost.
[0096] At the same time, the additive manufacturing method for precious metal products provided in this application can directly manufacture silver jewelry with complex structures such as high hollowing out and overlapping, and the complexity of the product has no correlation with the manufacturing cost, which can overcome the disadvantages of traditional manufacturing methods that products can be manufactured with low manufacturing complexity and the complexity is proportional to the manufacturing cost.
[0097] Furthermore, the present application can achieve light weight and high strength in the prepared precious metal products through the design of internal microporous structure. Under the same volume, the amount of precious metal can be reduced by 20% to 30%, which can reduce costs and improve the strength of the product at the same time.
[0098] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0099] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
Claims
1. A method for additive manufacturing of precious metal products, It is characterized in that The method comprises: Precious metal slurry is prepared by using photosensitive resin, dispersant, anti-settling agent and precious metal powder; Placing the precious metal slurry as the 3D printing material of the precious metal product in a light-curing 3D printer; Printing the precious metal slurry according to the simulation model of the precious metal product preset in the light-curing 3D printer until a green embryo model of the precious metal product is generated; The green model is sequentially cleaned, degreased, sintered and polished to obtain a printed precious metal product; The precious metal slurry is prepared by using a photosensitive resin, a dispersant, an anti-settling agent and precious metal powder, including: Mixing the photosensitive resin, the dispersant and the anti-settling agent to obtain an organic mixture; adding the noble metal powder to the organic mixture to obtain the noble metal slurry; In the precious metal slurry, the precious metal powder is 80wt%, the photosensitive resin is 18.2wt%, the anti-settling agent is 0.8wt%, and the dispersant is 1wt%; The printing of the precious metal slurry comprises: Printing the precious metal slurry under preset conditions; The preset condition is: the exposure of the light-curing 3D printer is 15~25mw / cm 2 The number of printed bottom layers is 3 to 9, the bottom exposure time is 6 to 12 seconds, and the normal exposure time is 3 to 6 seconds.
2. The method according to claim 1, It is characterized in that The green model is sequentially cleaned, degreased, sintered and polished to obtain a printed precious metal product, including: The green embryo model is placed in an alcohol solution for ultrasonic cleaning for 5 to 20 minutes, then taken out and placed in an oven for drying, and the weight of the green embryo model is weighed; Repeating the cleaning, drying and weighing until the weight difference between the weight of the green embryo model and the weight of the dried green embryo model is less than a preset weight, thereby obtaining a cleaned green embryo model; The cleaned green model is subjected to degreasing, sintering and polishing treatments in sequence to obtain a printed precious metal product.
3. The method according to claim 2, It is characterized in that The cleaned green model is subjected to degreasing, sintering and polishing treatments in sequence to obtain a printed precious metal product, including: Placing the cleaned green embryo model in a hot air degreasing furnace until the surface of the cleaned green embryo model is the color of a precious metal, thereby obtaining a degreased green embryo model; The degreased green model is sintered and polished to obtain a printed precious metal product.
4. The method according to claim 3, It is characterized in that The step of sintering and polishing the degreased green model to obtain a printed precious metal product comprises: Cooling the degreased green model to room temperature and then embedding it in ceramic powder to obtain a filled green model; The filled green embryo model is placed in a muffle furnace for sintering treatment, and then placed in water for quenching treatment to obtain a sintered green embryo model, wherein the sintering treatment is heated to 850-910° C. at a rate of 2° C. / min and then kept warm for 30 min-60 min; The sintered green model is polished to obtain a printed precious metal product.
5. The method according to claim 4, It is characterized in that The sintered green model is polished to obtain a printed precious metal product, including: Placing the sintered green model in a magnetic polishing machine, and adding pure water into the magnetic polishing machine for polishing to obtain a primary polished model; The primary polishing model is subjected to mirror polishing or frosted polishing to obtain a printed precious metal product.
6. The method according to claim 5, It is characterized in that The first polishing model is subjected to mirror polishing, comprising: The primary polishing model is placed in a drum polishing machine for mirror polishing; The drum polishing machine includes ceramic balls, the particle size of the ceramic balls is 1 mm to 1.5 mm, the number of the ceramic balls is determined according to the volume of the primary polishing model, and the polishing time is 30 to 60 minutes.
7. The method according to claim 5, It is characterized in that The frosted surface of the primary polishing model is polished, comprising: The primary polishing model is placed in a drum polishing machine for frosted surface polishing; The drum polisher includes ceramsite balls, the particle size of the ceramsite balls is 0.1 mm to 0.5 mm, the number of the ceramsite balls is determined according to the volume of the primary polishing model, and the polishing time is 30 to 60 minutes.
8. A precious metal product, It is characterized in that The precious metal product is prepared by the additive manufacturing method for precious metal products according to any one of claims 1 to 7.