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WO2019109498A1 - Structure de connexion pour élément réalisé par fabrication additive et son procédé de fabrication - Google Patents

Structure de connexion pour élément réalisé par fabrication additive et son procédé de fabrication Download PDF

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Publication number
WO2019109498A1
WO2019109498A1 PCT/CN2018/074425 CN2018074425W WO2019109498A1 WO 2019109498 A1 WO2019109498 A1 WO 2019109498A1 CN 2018074425 W CN2018074425 W CN 2018074425W WO 2019109498 A1 WO2019109498 A1 WO 2019109498A1
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WO
WIPO (PCT)
Prior art keywords
printing
component
data model
connection structure
hole
Prior art date
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Ceased
Application number
PCT/CN2018/074425
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English (en)
Chinese (zh)
Inventor
张婷婷
王雨萌
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Individual
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Individual
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Filing date
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Publication of WO2019109498A1 publication Critical patent/WO2019109498A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing

Definitions

  • the invention belongs to the field of 30 printing technologies, and in particular relates to a connection structure of a 30 printing member and a manufacturing process thereof.
  • 30 printing technology is a rapid prototyping device that utilizes additive technology such as photo-curing and paper lamination. It is first modeled by computer modeling software, and then the partitioned 3D model is “partitioned” into layer-by-layer sections, ie slices, to guide Printer layer-by-layer additive printing; With the development of 30 printing technology, its application range extends to jewelry, footwear, industrial design, construction, engineering and construction (eight, automotive, aerospace, etc.;
  • connection method is Still traditional. And in order to achieve different connection purposes, different machines and materials are required. ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425 materials and processes, because of the nature of the material itself, the connection method and connection effect will also be limited.
  • connection methods such as manual sewing and bonding
  • 3 printing technology to directly print on the surface of the external member to be connected
  • 30 printing members directly printed on the surface of the external member to be connected, which is more convenient and reduces the cost.
  • the method requires high material for the external member, and has limitations on the type and surface roughness of the material. Otherwise, the surface adhesion is not strong, and the adhesion is not easy, and the connection is not firm; in order to solve the problem of low adhesion, further people start to use 30.
  • the base layer of the printing member is infiltrated into the pore gap of the material to achieve the effect of joint bonding, but the connection method has higher requirements on the thickness and void structure of the outer member material itself;
  • the area and space that penetrates into the external material is large enough to have good Viscous coupling force, the use of more limited;
  • connection structure of the 30 printing members in the prior art is manually connected, the cost is high, and the connection structure is easy to be damaged; the planar connection, the firmness of the connection structure is low, and the separation phenomenon is easy; the infiltration connection, the material The choice of the larger limit of the mutual penetration of the components will lead to the difficulty of separation from each other, high recycling costs, difficult to recycle, environmental pollution is not environmentally friendly.
  • one of the objects of the present invention is to provide a connection structure of 30 printing members, which is more firmly connected to the external members;
  • a second object of the present invention is to provide a connection structure for a 30 printing member described above. ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425)
  • the manufacturing process is simple and practical.
  • the connection structure made by this process is more secure.
  • a connection structure of a 30 printing member comprising: a first member; and a second member for connecting with the first member; the second member is provided with a connecting through hole; the first member includes the a bottom member on one side of the second member, a top member on the other side of the second member, and a connecting member in the connecting through hole, the second member being sandwiched between the bottom member and the top member;
  • the bottom member and the top member and the connecting member are integrally formed as a first member by 30 printing.
  • the connecting member is located in the connecting through hole of the second member, the two ends of the connecting member are respectively an integrally formed bottom member and a top member; the bottom member and the top member sandwich the second member; wherein the bottom member, The top member, the connecting member, and the second member may each have any shape, and the second member may be a member that has been previously printed by 30, or a member that is externally produced by other means; because the bottom member, the top member, and the connecting member
  • the integral molding makes the connection structure of the 30 printing member more firm, and the first member and the second member can be relatively slid or rotated or statically fixed, but cannot be detached, and the connection is firm.
  • the second member is provided with a connecting through hole.
  • the connecting member located in the connecting through hole can be regarded as a pivot, and the first member and the second member can also be opposite as long as the connecting member and the connecting through hole can be relatively rotated or slid. Turn or slide. ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425
  • the second member is provided with at least two connecting through holes. When the connecting through holes are set to two or more, the number is increased The constraint of the motion pair, and because of the more connection points, makes the connection structure more securely connected.
  • the outer side surface of the connecting member is in clearance or a sliding fit or a rotational fit with the inner side surface of the connecting through hole.
  • the shape size of the connection through hole and the shape of the connection through hole are designed, that is, various different cooperation manners can be formed, so that the first member and the second member can be relatively rotated or relatively slid or statically connected. Wait for the connection form.
  • the connecting member uses a material that is a soluble material, and the soluble material is soluble in an external solution in which the bottom member and/or the top member are insoluble.
  • a material that is a soluble material is soluble in an external solution in which the bottom member and/or the top member are insoluble.
  • the material is such that the connecting member can be dissolved in a specific water-soluble solution, and after the connecting member in the connecting structure of the 30 printing member is dissolved, the bottom member and the top member and the second member are easily separated, which is convenient Classification of recycled materials is not easy to cause environmental pollution.
  • the connecting member has a melting point lower than a melting point of the bottom member and a melting point of the top member. Heating the connection structure of the 30 printing member, using the difference of the melting points, so that the connecting member is melted, so that the bottom member and the top member are separated, thereby separating the first member and the second member, and sorting and recycling; more environmentally friendly, not easy to cause Environmental pollution.
  • a technical solution adopted is: a manufacturing process of a connecting structure of 30 printing members, for manufacturing a connecting structure of a 30 printing member according to claim 1. Including the following process steps, ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425
  • the first component obtains the data model of the first component
  • the second component of the data modeling obtains the data model of the second component
  • the data model of the first component is matched with the data model of the second component, Get a matching positional relationship
  • step 2 2) according to the data model of the first component obtained in step 1, 30 printing the bottom member of the first member, obtaining the bottom member of the entity, and pausing printing;
  • step 3 According to the matching positional relationship obtained in step 1, the second member of the entity is correspondingly placed on the bottom member of the entity with a virtual matching positional relationship as a standard, so that the position of the connecting through hole and the position of the connecting member are Corresponding matching; simultaneous operations are performed by replacing 30 printing materials in use or keeping the materials in use unchanged;
  • step 4 printing the connecting member of the first member to obtain a solid connecting member, and the connecting member is correspondingly located in the connecting through hole;
  • Pause print replacement 30 Print the materials used or continue printing to keep the materials in use.
  • step 1 According to the data model of the first member obtained in step 1, 30 prints the top member of the first member.
  • the second member when the first step is performed, the second member may also be a virtual member, and the second member that has not been manufactured is modeled, and then produced by 30 printing or other methods;
  • the component that has been manufactured, the data of the second component of the entity is modeled;
  • the second component must be a solid component when performing the fourth step;
  • the material used for printing the connecting member is a soluble material, and the soluble material is soluble in the bottom member and/or the top member.
  • the soluble material is soluble in the bottom member and/or the top member.
  • the bottom member and the top member are both made of a non-soluble material, so that the connecting member can be dissolved in a specific water-soluble solution, after the connecting member in the connecting structure of the 30 printing member is dissolved, the bottom member and the top member and the second member
  • the three are easy to separate, which is convenient for sorting and recycling materials, and is not easy to cause environmental pollution.
  • the melting point of the material used for the 30-print connecting member is lower than the melting point of the material used for printing the bottom member in step 3) and the melting point of the material used in the printing of the top member in step 5). .
  • the melting point of each part of the produced connecting structure is different, and the connecting structure of the 30 printing member is heated, and the connecting member is melted by the difference of the melting points, so that the bottom member and the top member are separated, and the first member and the second member are separated. And sorting and recycling; more environmentally friendly, not easy to cause environmental pollution.
  • the present invention accomplishes the second object of the invention, and another technical solution adopted is: a manufacturing process of a connection structure of 30 printing members, for manufacturing a connection structure of a 30 printing member according to claim 1.
  • the first member and the second member are both 30 printing members, including the following process steps,
  • step 2 2) according to the data model of the first component obtained in step 1, 30 printing the bottom member of the first member to obtain the bottom member of the entity;
  • step 4 according to the first component data model obtained in step 1, 30 printing the connecting member, so that the position of the connecting through hole corresponds to the position of the connecting member;
  • step 5 According to the first component data model obtained in step 1, 30 prints the top member.
  • the beneficial effects of the present invention are: providing a connection structure of 30 printing members and two production processes for producing the structure:
  • the bottom member and the top member sandwich the second member, and the connecting member is connected through the connecting through hole of the second member, because the bottom member, the top member and the connecting member are integrally formed, so that the connection structure of the 30 printing member is further Firm, simple structure, simple production process and low production cost;
  • the connecting manner is selected according to actual needs, so that the first member and the second member can be actually It is necessary to choose whether there is a sliding relationship, a rotating relationship or a static fixed relationship with each other; the production options are diversified, the connection methods are diversified, and the market demand is more adapted.
  • connection structure of the 30 printing member can be separated by a dissolution method or a different melting point heating method, and the 30 printing member can be easily recovered, which is convenient to use and more environmentally friendly.
  • FIG. 1 is a cross-sectional structural view showing a connection structure of a 30 printing member described in Embodiment 1; ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425)
  • FIG. 2 is a cross-sectional structural view showing a connecting member and a connecting through hole of a connection structure of a 30 printing member described in Embodiment 2;
  • Figure 3 is a plan view showing the structure of a connection structure of a 30 printing member described in Embodiment 4;
  • a connecting structure of a 30 printing member as shown in FIG. 1 includes a first member 1 and a second member 2 for combined connection with the first member 1; the second member 2 is provided with a connecting through hole
  • the first member 1 includes a bottom member 11 on the side of the second member 2, a top member 12 on the other side of the second member 2, and a connecting member located in the connecting through hole 21. 13.
  • the second member 2 is sandwiched between the bottom member 11 and the top member 12; the bottom member 11 and the top member 12 and the connecting member 13 are integrally formed as a first member 1 by 30 printing.
  • the first member 1 has a dumbbell shape as a whole, and the bottom member 11 and the top member 12 have a cylindrical shape, and the second member 2 is a support rod which is externally made by other means, and is provided at one end of the second member 2.
  • the outer side surface of the connecting member 13 is provided with a gap between the inner side surface of the connecting through hole 21 and the distance between the bottom member 11 and the top member 12.
  • the first member 1 and the second member 2 are not only firmly connected, but also the first member 1 can slide left and right relative to the second member 2 or Turn.
  • connection structure of a 30 printing member is as follows:
  • the data to be read specifically includes, but is not limited to, the shape data of the second member 2 is a support rod, the connection through hole 21 is circular, the number is one, the size of the connection through hole 21 is eight, and the position of the connection through hole 21 is The data model of the thickness of the two members 2, the surface flatness, and the like.
  • the second component 2 of the data modeling in this step can be modeled by 30, or other data model with holes in the plane built by the eight-eighth method (such as digital knitting woven and laser cutting), with 30
  • the data model of the first component 1 of the print data modeling matches
  • step 2 data modeling design first component 1 obtains the data model of the first component 1, and the data model of the first component 1 and the data of the second component 2 The models are matched to obtain a matching positional relationship;
  • the virtual data model of the first component 1 is designed to be obtained, and the printing steps and printing parameters of the printer are digitized.
  • the connecting member 13 is required.
  • the structure is designed to be cylindrical, the diameter 8 of the connecting member 13 is smaller than the diameter of the connecting through hole 21; the length of the connecting member 13 is larger than the length of the connecting through hole 21, and the like;
  • the second member 2 of the entity is correspondingly placed on the bottom member 11 of the entity with a virtual matching positional relationship as a standard, so that the position of the connecting through hole 21 and the connecting member are made.
  • the position of 13 is correspondingly matched; in this step, the second member 2 and the bottom member 11 are mainly physically adapted, and the position of the connecting through hole 21 is matched with the position of the connecting member 13 to be printed 30; The operation is performed by replacing 30 the materials being used or keeping the materials used. In this embodiment, the printing materials are selected and changed to
  • step 5 5) according to the data model of the first member 1 obtained in step 2, 30 printing the connecting member 1 of the first member, obtaining the connecting member 13 of the solid, and the connecting member 13 is correspondingly located in the connecting through hole 21;
  • the position of the second member 2 corresponds to the position of the bottom member 11, so that when the connecting member 13 is printed 30, the connecting member 13 can be directly printed in the connecting through hole 21;
  • the top member is printed as a cylindrical solid structure.
  • the structure shown in FIG. 1 can be finally produced.
  • the shape and structure of the bottom member 11, the top member 12, the connecting member 13, the second member 2, and the connecting through hole 21 are both Different products can be changed and produced according to the actual order demand of the market; no matter what kind of product is produced, as long as the connection structure of a 30 printing member disclosed by the present invention is adopted, the first member and the second member are not easily separated; ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425)
  • step 4 can be performed, and when the physical position matching placement is performed, the subsequent printing is performed.
  • the material used is used in the process step 5 to print the connecting member 13 The material is easily dissolved in a specific water washing environment, so that the bottom member 11 and the top member 12 are separated and recovered;
  • the material can also be dissolved as a precipitant at a low concentration of sodium hydroxide, calcium carbonate, etc., and precipitated from the aqueous solution for recovery;
  • the material used for the bottom member 11 and the material used for the top member 12 may also be different, and even the bottom member 11, the top member 12, and the connecting member 13 may use different materials; for example, in an actual production process.
  • the middle member the bottom member 11 is a member with less material, and the bottom member 11 is made of a water-soluble material without affecting its usability, and material recovery is more convenient; the connecting member 13 and the top member 12 are similarly applied. The invention will not be described in detail.
  • the first member 2 is physically present, and then the first member 1 is matched according to the second member 2 of the entity; in other embodiments, the first member 1 and the second member may be The component 2 simultaneously performs virtual data modeling, and then matches each other to achieve the corresponding design requirements, regenerates the second component 2 of the entity, and then combines the second component 2 of the entity to produce the second component 1 of the entity. ⁇ 0 2019/109498 ⁇ (:1' 2018/074425 Example 2
  • FIG. 2 is a cross-sectional structural view showing a connecting member of a connection structure of a 30 printing member and a connecting through hole.
  • the connecting member 13 and the connecting through hole 21 in the embodiment are both square structures; and the connecting member 13 and The connecting through holes 21 are the same size, and the outer side wall of the connecting member 13 is closely attached to the inner side wall of the connecting through hole 21, and is statically fixed;
  • the connecting member 13 of the square structure in the embodiment in the specific process step 2, when the data of the connecting member 13 is modeled, the connecting member 13 needs to be designed to have the same shape and shape as the connecting through hole 21, and other The process steps and parameters are the same as those in the first embodiment.
  • the third embodiment differs from the first embodiment in that the third printing member is separated and recovered by using a different melting point heating method in the third embodiment.
  • the specific method is that the material of the connecting member 13 is a material having a low melting point.
  • the material 13 is used on the material of the bottom member 11 and the top member 12, and the melting point of the material 13 is higher than the melting point of the material eight, so that the connecting member 13 can be melted in advance by heating to separate the first member and the second member.
  • the fourth embodiment differs from the first embodiment or the second embodiment or the third embodiment in that:
  • a member in which the second member 2 is printed in advance by 30 is in a planar shape, and five connecting through holes 21 are provided;
  • the bottom member 11 is an elongated structure connecting the connecting members in the connecting through holes 21 Formed 13;
  • the top member 12 is also a long knot ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425 is formed by connecting the connecting members 13 each located in the connecting through hole 21;
  • the shape of the connecting through hole 21 is square, the connecting member 13 The shape and the size are matched with the shape of the connecting through hole 21, the length of the connecting member 13 is exactly the length of the connecting through hole 21, and the bottom member 11 and the top member 12 are clamped from both sides of the second member 2;
  • the connecting structure in the example is provided with a plurality of connecting through holes 21, the connecting structure is very stable, and the plurality of connecting through holes 21 are arranged such that the first member 1 and the second member 2 form a connection in the form of a loop, the bottom member 11 and the top
  • connection structure of a 30 printing member is as follows:
  • the data to be read specifically includes, but is not limited to, the shape data of the second member 2 is a planar structure, the connection through holes 21 are square, the number is five, the positions of the connection through holes 21, and the size of the connection through holes 21 ( : The data model of the thickness of the second member 2, the surface flatness, and the like.
  • step 2 According to the data model of the second component obtained in step 1, 30 data modeling design first component obtains the data model of the first component, and matches the data model of the first component with the data model of the second component, Get a matching positional relationship;
  • the virtual data model of the first component is designed to obtain the printing process and the printing parameters of the 30 printer.
  • the connecting member 13 is required.
  • the structure is designed as a square cylinder, and the diameter 0 of the connecting member 13 is equal to the diameter of the connecting through hole 21 (:; the length of the connecting member 13 is equal to ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425 connects the length of the through hole 21, etc.;
  • the structure of the connecting member 13 is designed as a square cylinder, the size is the same as or slightly smaller than the connecting through hole 21, so that printing
  • the connecting member 13 and the connecting through hole 21 are statically fixedly connected; the length is just designed to connect the length of the through hole 21;
  • the second member 2 of the entity is correspondingly placed on the bottom member 11 of the entity with a virtual matching positional relationship as a standard, so that the position of the connecting through hole 21 and the connecting member are made.
  • the position of 13 is correspondingly matched; in this step, the second member 2 and the bottom member 11 are mainly physically adapted, and the position of the connecting through hole 21 is matched with the position of the connecting member 13 to be printed 30; The operation is performed by replacing 30 the materials being used or keeping the materials used. In this embodiment, the printing materials are selected and changed to
  • the connecting member 13 of the first member 1 is printed to obtain a solid connecting member 13, and the connecting member 13 is correspondingly located in the connecting through hole 21;
  • the position of the second member 2 corresponds to the position of the bottom member 11 in the step, so when the connecting member 13 is printed 30, the corresponding connecting member 13 can be directly printed in the connecting through hole 21; and because the through hole 21 is connected
  • the shape and the sectional shape of the connecting member 13 are designed to be square, so that the connecting member 13 is more firmly connected to the connecting through hole 21.
  • the materials are consistent;
  • step 2 print the top member.
  • the structure of the product to be produced in the fifth embodiment is the same as that of the first embodiment, but the difference is that the second member 2 in the embodiment 5 is not an outer member but a 30 printing member, and the method adopted is One member 1 and the second member 2 are simultaneously printed, and the steps are as follows:
  • step 2 2) according to the data model of the first member 1 obtained in step 1, 30 printing the bottom member 11 of the first member 1 to obtain a solid bottom member 11;
  • a 30 print with dual nozzles can be used.
  • ⁇ 0 2019/109498 ⁇ (: 17 (: ⁇ 2018 / 074 425 machine, respectively to print the first member 1 and the second member 2; can also use a single nozzle 30 printer for the first member 1 and the second member 2 respectively To print, where the printed material needs to be replaced, you can pause printing the replacement material.
  • the 30 printer used in the present invention may be any of the existing 30 printers, and the 30-printed first member 1 can grow a plurality of connecting members 13 under the digital control by using a 30-print layer-by-layer additive method.
  • the connection through hole 21 is preset on the second member 2, and then the layer 1 is continuously stacked to print the first member 1 of the complete body, thereby completing the first member 1 in the process of self growth.
  • the bottom member 11, the top member 12 and the connecting member 13 are designed together as a whole first member 1; the connecting member 13 and the connecting through hole are formed during modeling 21, according to the desired connection effect (can be the same as the static fixed connection in the embodiment 2, can also be connected like the shaft in the embodiment 1 or a plurality of connecting columns in the embodiment 4 to form a loop-type connection, etc. ), to match each other's position, length, size and structure; wherein the bottom member 11 and the top member 12 can be modeled into different shape sizes according to the required design to meet the needs of the market;
  • the bottom member 11, the top member 12 and the connecting member 13 can be manufactured by selecting different materials, such as implementation. 13 , the material can be recovered by a dissolution method; in Embodiment 3, the connecting member 13 is manufactured using a material having a lower melting point than the bottom member 11 and the connecting member 12, and the product using the connecting structure of the 30 printing member can have a different melting point.
  • the heating method is used for recycling materials; there are various recycling methods to choose from, which are more applicable and more environmentally friendly. ⁇ 0 2019/109498 ⁇ (:17(: ⁇ 2018/074425)
  • the invention also digitally designs the connection process, using the characteristics of the 30 printer, so that the 30-print structure can be digitally matched with a wide variety of materials.
  • each point and position of the connection is digitally designed, so that the two objects to be connected can be structurally matched with each other, so that a wide variety of connections can be made to make a wide variety of
  • the material can be connected to 30 printed objects.
  • the connection structure is completed during the manufacture of the object, so the traditional connection step is omitted.
  • Digital fit is a key because it makes the structure and position and effect of the connection to a large extent It is not limited by materials, allowing material selection to be connected to 30 print structures, and a wide variety of connection effects can be achieved.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)

Abstract

L'invention concerne une structure de connexion pour un élément réalisé par fabrication additive et son procédé de fabrication. La structure de connexion pour un élément réalisé par fabrication additive comprend un premier élément (1) composé d'un élément inférieur (11), d'un élément supérieur (12) et d'un élément de connexion (13), et comprend en outre un second élément (2) pourvu d'un trou débouchant de connexion (21), le second élément (2) étant pris en sandwich entre l'élément inférieur (11) et l'élément supérieur (12), l'élément de connexion (13) passant à travers le trou débouchant de connexion (21) du second élément (2) pour la connexion. Comme l'élément inférieur (11), l'élément supérieur (12) et l'élément de connexion (13) sont formés d'un seul tenant, ladite structure de connexion pour un élément réalisé par fabrication additive est plus stable et présente une structure simple, est facile à produire, est largement utilisée et a un degré élevé d'appariement flexible.
PCT/CN2018/074425 2017-12-05 2018-01-29 Structure de connexion pour élément réalisé par fabrication additive et son procédé de fabrication Ceased WO2019109498A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201711271842.0 2017-12-05
CN201711271842.0A CN108454113A (zh) 2017-12-05 2017-12-05 一种3d打印构件的连接结构及其制造工艺

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US9027320B2 (en) * 2013-04-10 2015-05-12 M/s SUNJEWELS INTERNATIONAL PVT. LTD. Hollow ornaments and process for producing them
US20140339745A1 (en) * 2013-05-17 2014-11-20 Stuart URAM Molds for ceramic casting
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CN205291464U (zh) * 2016-01-21 2016-06-08 东莞市康铭光电科技有限公司 一种三维打印制备的塑胶注塑模仁

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