CN108971491B - 3D printing method of metal dental crown - Google Patents
3D printing method of metal dental crown Download PDFInfo
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- CN108971491B CN108971491B CN201810998145.3A CN201810998145A CN108971491B CN 108971491 B CN108971491 B CN 108971491B CN 201810998145 A CN201810998145 A CN 201810998145A CN 108971491 B CN108971491 B CN 108971491B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/364—Process control of energy beam parameters for post-heating, e.g. remelting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/40—Structures for supporting workpieces or articles during manufacture and removed afterwards
- B22F10/47—Structures for supporting workpieces or articles during manufacture and removed afterwards characterised by structural features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/50—Treatment of workpieces or articles during build-up, e.g. treatments applied to fused layers during build-up
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/10—Auxiliary heating means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/10—Auxiliary heating means
- B22F12/13—Auxiliary heating means to preheat the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/10—Auxiliary heating means
- B22F12/17—Auxiliary heating means to heat the build chamber or platform
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a 3D printing method of a metal dental crown, which comprises the following steps: step a: laying a layer of metal printing powder on the printing platform; step b: emitting laser light with a first predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a support structure; step c: emitting laser light with a second predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form a metal dental crown solid layer; step d: emitting laser with a third preset energy value to carry out multi-channel contour edge-hooking treatment on the metal dental crown solid layer on the printing platform; step e: and (c) paving another layer of metal printing powder on the basis of the previous layer of metal printing powder, and continuing to execute the step (b). Through the mode, when the metal dental crown is printed, the edge-hooking treatment is carried out on each layer of the metal dental crown solid layer, so that the inner surface and the outer surface of the metal dental crown layer are smooth, the metal dental crown cannot abrade dental pulp, and the user experience is greatly improved.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a 3D printing method of a metal dental crown.
Background
Dental crowns are broadly defined in dentistry as the portion of a tooth that is exposed outside of the gums. The dental crowns in the market today are most commonly referred to as "artificial dental crowns" (or referred to as braces). Artificial crowns are used primarily to repair or restore teeth. When the tooth decay or lesion or various injuries of the tooth are difficult to repair through simple filling, the tooth can be repaired through the dental crown under the suggestion of a dentist for the health consideration and the purpose of tooth reshaping and beauty.
At present, a plurality of manufacturers on the market can automatically generate the dental crowns, but the internal and external surfaces of the dental crowns generated on the market are rough and have adhering slag, so that the dental pulp is easily worn, and the user experience is greatly reduced.
Disclosure of Invention
The invention mainly solves the technical problem of providing a 3D printing method of a metal dental crown, and when the metal dental crown is printed, a plurality of contour edge-hooking treatments are carried out on each layer of metal dental crown solid layer, so that the inner surface and the outer surface of the metal dental crown solid layer are smooth, the metal dental crown cannot abrade dental pulp, and the user experience is greatly improved.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a 3D printing method of a metal dental crown, including: step a: laying a layer of metal printing powder on the printing platform; step b: emitting laser light with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form a support structure of the metal dental crown; step c: emitting laser with a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a metallic dental crown solid layer connected or disconnected with the support structure; step d: emitting laser with a third preset energy value to carry out multi-pass contour pointing treatment on the metal dental crown solid layer on the printing platform so as to enable the inner surface and the outer surface of the metal dental crown solid layer to be smooth; step e: and c, continuously paving another layer of metal printing powder on the basis of the previous layer of metal printing powder, and continuously executing the step b.
Wherein, before the step of emitting laser with a third predetermined energy value to perform a plurality of contour pointing processes on the solid layer of the metal dental crown on the printing platform, the method further comprises: emitting laser light having a fourth predetermined energy value to partially reflow the solid layer of the metal crown on the printing platform; the step of emitting laser with a third predetermined energy value to carry out a plurality of contour edge treatment on the metal dental crown solid layer on the printing platform comprises the following steps: emitting a laser having a third predetermined energy value to melt the inner and outer surfaces of the solid layer of the metal crown.
Wherein the step of emitting laser light having a first predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form the support structure of the metallic dental crown comprises: and emitting laser with a first preset energy value to selectively melt the layer of metal printing powder on the printing platform to form a cross-block-shaped support structure.
Wherein the step of emitting laser light with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form a cross-block-shaped support structure comprises: and controlling a laser head to emit laser with a first preset energy value to selectively melt the layer of metal printing powder on the printing platform in sequence so as to form a plurality of adjacent supporting structures in a cross block shape.
Wherein, after the step of emitting laser with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form the supporting structure in a cross block shape, the method further comprises: and emitting laser with a first preset energy value to selectively melt the layer of metal printing powder on the printing platform so as to form a support structure in a conical shape on the support structure in the shape of a cross block.
Wherein the step of emitting laser light having a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a metallic dental crown solid layer with or without connection to the support structure comprises: and controlling the laser head to emit laser with a second preset energy value to sequentially and selectively melt the layer of metal printing powder on the printing platform so as to form a plurality of adjacent metal dental crown solid layers.
Wherein the thickness of each layer of the metal printing powder is 35-40 μm.
The laser head is provided with a laser head, and the laser head is used for printing metal printing powder.
Wherein a heating substrate is arranged on the printing platform, and the metal dental crown entity is arranged on the heating substrate, and the method further comprises the following steps: after the metal dental crown entity is formed, heating the heating substrate to heat the formed metal dental crown entity on the printing platform; and carrying out sand blasting on the formed metal dental crown entity.
The printing platform is provided with a heating substrate, the metal printing powder is arranged on the heating substrate, and the metal printing powder is bronze powder, and the method further comprises the following steps: and heating the heating substrate on the printing platform when the step of selectively melting the layer of metal printing powder on the printing platform by emitting the laser with the second predetermined energy value is executed.
The invention has the beneficial effects that: in contrast to the prior art, the disclosed 3D printing method of metal crowns comprises: step a: laying a layer of metal printing powder on the printing platform; step b: emitting laser light with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form a support structure of the metal dental crown; step c: emitting laser with a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a metallic dental crown solid layer connected or disconnected with the support structure; step d: emitting laser with a third preset energy value to carry out multi-pass contour pointing treatment on the metal dental crown solid layer on the printing platform so as to enable the inner surface and the outer surface of the metal dental crown solid layer to be smooth; step e: and c, continuously paving another layer of metal printing powder on the basis of the previous layer of metal printing powder, and continuously executing the step b. Through the mode, when the metal dental crown is printed, the 3D printing method of the metal dental crown carries out multiple contour edge-hooking treatments on each layer of metal dental crown solid layer, so that the inner surface and the outer surface of the metal dental crown solid layer are smooth, the metal dental crown cannot abrade dental pulp, and the user experience is greatly improved.
Drawings
Fig. 1 is a schematic flow chart of the 3D printing method of the metal crown of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, fig. 1 is a flow chart illustrating a 3D printing method of a metal crown of the present invention. The 3D printing method comprises the following steps:
step 101, setting ST L format data.
it should be understood that ST L is a specific 3D print data format that can be converted to ST L format by inputting three dimensional data of the part to be printed.
Step 102: optimizing the placing angle of the dental crown.
It should be understood that, since the inner surface of the fixing bridge of the dental crown will directly contact with the abutment of the patient and is an important molding surface, in order to ensure the crown margin and the internal suitability of the dental crown, a polishing process has to be performed in the subsequent processing, so that in order to ensure the molding quality of the inner surface, i.e. to facilitate polishing of the inner surface, the angle of the crown fixing bridge model needs to be optimized, and therefore the setting of step 102 is mainly for facilitating the subsequent polishing operation.
Further, in some embodiments, after step S102, step S1 is further included: the addition of a support structure is provided. It should be understood that the supporting structure is used for supporting the dental crowns, a plurality of dental crowns can be supported by the supporting structure, and the addition of the supporting structure can be automatically added by Magics software (a three-dimensional model software), so long as parameters such as the angle of the supporting surface, the thickness of the supporting surface, the supporting area and the like are set, and the supporting structure can be printed according to the parameters in subsequent printing.
Further, in some embodiments, after step S1, the method further includes the steps of: and (5) hierarchical processing and path planning. It should be understood that the layering process is mainly implemented in Magics software, and the typeset parts and the support structure can be sliced according to a certain layer thickness to obtain a two-dimensional cross section with a fixed layer thickness. The path planning is to plan different laser scanning modes for different structures of each layer of two-dimensional cross section, namely planning how to perform laser melting on each layer of two-dimensional cross section.
Step 103: and setting printing process parameters.
It should be understood that in step S103, the setting of the printing process parameters is mainly performed in Magics software. The printing process parameters comprise laser power value, laser scanning speed, laser scanning interval, slice layer thickness of printing powder, powder supply amount and the like.
It should be noted that the operations of step S101, step S102 and step S103 are software settings, and can be directly performed in Magics software.
Step a: and laying a layer of metal printing powder on the printing platform.
In this embodiment, the thickness of each layer of metallic printing powder is 35 μm (micrometer) to 40 μm. It should be understood that the thickness of each layer of metal printing powder is 30um, which is conventional in the prior art, and the metal printing powder laid by the present embodiment has a thicker thickness and can be produced quickly compared with the conventional slicing layer thickness process.
Step b: the layer of metallic printing powder on the printing platform is selectively melted by firing a laser having a first predetermined energy value to form a support structure for the metallic dental crown.
It should be understood that the support structure of the present embodiment can support the metal crown, so that the metal crown can ensure the metal crown is completely formed without deformation during the printing process.
Specifically, in this embodiment, the step of emitting laser light having a first predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form the support structure of the metallic dental crown includes: and emitting laser with a first preset energy value to selectively melt the layer of metal printing powder on the printing platform to form a cross block-shaped support structure.
It should be understood that the supporting structure is in a cross block shape, and can support the metal dental crown, and compared with other supporting structures in a circular or rectangular shape, the cross block-shaped supporting structure of the embodiment is easier to print, and saves printing powder.
In this embodiment, the step of emitting laser light with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form the support structure in a cross block shape includes: and controlling the laser head to emit laser with a first preset energy value to selectively melt the layer of metal printing powder on the printing platform in sequence so as to form a plurality of adjacent supporting structures in a cross block shape. It should be understood that a plurality of supporting structures in a cross block shape can be formed on each layer of metal printing powder, so that the laser head is controlled to selectively melt the layer of metal printing powder on the printing platform in sequence, and the laser skip stroke and time can be effectively reduced.
It is noted that the cruciform block-like support structure is a non-solid support, without thickness, without volume, having only a sheet-like contour, and being able to support only one metal crown alone, and not a plurality or a plurality of rows of metal crowns. Therefore, in some embodiments, after the step of emitting the laser with the first predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form the support structure in the shape of a cross block, the method further includes the step X: the layer of metallic printing powder on the printing platform is selectively melted by emitting laser light with a first predetermined energy value to form a support structure in a conical shape on the support structure in a cross block shape. The conical support is a solid support, is a conical solid and can support a plurality of or a plurality of rows of metal dental crowns.
In the embodiment, the supporting structure of the metal dental crown is mainly in the shape of a cross block, and the conical support is used as an auxiliary mode, so that the metal dental crown can be ensured to be completely formed without deformation and is easy to remove. The supporting structure in the shape of the cross block is free of solid support, energy required by forming process parameters is low, forming speed is high, the supporting structure in the auxiliary conical shape is solid support, supporting tension can be enhanced, one or more rows of metal crowns can be supported, and reduction of deformation of long bridge parts is facilitated.
Step c: and emitting laser with a second preset energy value to selectively melt the layer of metal printing powder on the printing platform so as to form the metal dental crown solid layer connected or not connected with the supporting structure.
It should be understood that in laser scanning printing, the two-dimensional cross section of each layer of metal printing powder is mainly used as a printing base surface, and the two-dimensional cross section is scanned in the abscissa or ordinate direction, so that the metal dental crown solid layer is partially connected with the support structure in the cross block shape, and the metal dental crown solid layer is partially not connected with the support structure in the cross block shape.
In this embodiment, the step of emitting laser light having a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form the metallic dental crown solid layer connected or disconnected to the support structure comprises: and controlling the laser head to emit laser with a second preset energy value to sequentially and selectively melt the layer of metal printing powder on the printing platform so as to form a plurality of adjacent metal dental crown solid layers. It should be understood that a plurality of metal dental crown solid layers can be formed on each layer of metal printing powder, so that the embodiment can effectively reduce the laser skip stroke and time by controlling the laser head to selectively melt the layer of metal printing powder on the printing platform in sequence to form a plurality of adjacent metal dental crown solid layers.
It should be understood that in the present embodiment, the support structure is formed first and then the metal crown entity is printed, that is, after the support structure is formed on each layer of metal printing powder, the laser printing metal crown entity with different wavelengths is replaced, so that the printing efficiency is higher. Further, the laser light of the second predetermined energy value for forming the metal dental crown solid layer of the present embodiment has a different energy value from the laser light of the first predetermined energy value for forming the support structure, that is, the wavelength of the laser light corresponding to the first predetermined energy value is different from the wavelength of the laser light corresponding to the second predetermined energy value.
It will be appreciated that in some embodiments, the solid layer of metal dental crown of each layer is divided into a plurality of printing zones, and that the selective melting of the layer of metal printing powder on the printing platform is performed by sequentially firing laser light in each printing zone. Of course, for each different printing area, the laser with different energy values can be replaced for printing, that is, when the first printing area is printed, the laser with the emission wavelength of λ 1 is sequentially printed in the first printing area, and when the second printing area is printed, the laser is replaced, and the laser with the emission wavelength of λ 2 is sequentially printed in the second printing area.
Step d: and emitting laser with a third preset energy value to perform multiple contour edge treatment on the metal dental crown solid layer on the printing platform so as to enable the inner surface and the outer surface of the metal dental crown solid layer to be smooth.
In this embodiment, before the step of emitting the laser with the third predetermined energy value to perform the multiple contouring on the solid layer of the metal dental crown on the printing platform, the 3D printing method of the metal dental crown further includes: step A1: emitting a laser having a fourth predetermined energy value to partially remelt the solid layer of the metal crown on the printing platform. In addition, the step of emitting laser with a third predetermined energy value to perform a plurality of contour pointing processes on the metal dental crown solid layer on the printing platform comprises the following steps: step A2: and emitting laser with a third predetermined energy value to melt the inner and outer surfaces of the solid layer of the metal dental crown. It should be understood that the laser light with the fourth predetermined energy value for remelting the metal crown solid layer has a different energy value from the laser light with the third predetermined energy value for melting the inner and outer surfaces of the metal crown solid layer, that is, the wavelength of the laser light corresponding to the third predetermined energy value is different from the wavelength of the laser light corresponding to the fourth predetermined energy value, and of course, in this embodiment, the wavelength of the laser light corresponding to the third predetermined energy value is shorter than the wavelength of the laser light corresponding to the fourth predetermined energy value, wherein the wavelength of the laser light corresponding to the fourth predetermined energy value is equal to the wavelength of the laser light corresponding to the second predetermined energy value.
It should be understood that, in step c, the layer of metal printing powder on the printing platform is selectively melted by the laser with the second predetermined energy value to form a solid layer of metal crown, which is solid and does not have the shape of the crown, so that the present embodiment performs remelting on the solid layer of metal crown (including the inner wall and the outer wall) through step a1 to make the contour of the solid layer of metal crown correspond to the contour of the crown. Since the inner and outer surfaces of the metal dental crown solid layer have the laser convex point effect, the inner and outer surfaces of the metal dental crown solid layer are melted in the step a2 to make the inner and outer surfaces of the metal dental crown solid layer smooth.
It is worth noting that the shapes of the metal dental crown solid bodies of each layer are different, and the laser bump effect is eliminated for the metal dental crown solid bodies of each layer, so that the inner surface and the outer surface of the formed metal dental crown solid body layer are smooth, the metal dental crown solid body layer does not need to be polished again, the metal dental crown solid body layer can effectively adapt to the natural dental crown of a person, and dental flesh cannot be abraded.
The metal dental crown of the embodiment adopts a scanning strategy of firstly filling the solid and then hooking the edges of a plurality of profiles, firstly fills the inside of the solid by using an S-shaped orthogonal scanning strategy with a large compensation value, namely adopts high-speed and high-power laser scanning to ensure that a compact solid is efficiently formed, and then uses a plurality of profiles with a small compensation value to hook the edges, namely adopts low-speed and high-power laser scanning to obtain a uniform melting channel and eliminate the laser bump effect of internal filling, so that the inner surface and the outer surface of the metal dental crown are smooth and have no slag. In addition, the whole scanning sequence of the embodiment is that the support is carried out first and then the entity is that the partition is scanned in sequence, so that the laser skip stroke and time are effectively reduced.
Step e: and c, continuously paving another layer of metal printing powder on the basis of the previous layer of metal printing powder, and continuously executing the step b. It will be appreciated that in step e, the printing platform is lowered a certain distance accordingly and then powdered.
It should be noted that the steps a, b, c and d are necessary for each layer of metal printing powder, and the steps a, b, c, d and e are printer printing operations, which can be repeated to print the metal crown finally.
In addition, in some embodiments, the metal printing powder is copper alloy material powder, and due to the high reflectivity and low energy absorption efficiency of the copper alloy material, the reflected laser may damage the optical device (including the laser head), and therefore, in order to protect the optical device, the laser head is preferably provided with a protective lens for blocking the reflection of the laser. Further, a heating substrate is arranged on the printing platform, and the metal dental crown entity is arranged on the heating substrate, and the 3D method further comprises the following steps: after the metal dental crown entity is formed, heating the heating substrate to heat the formed metal dental crown entity on the printing platform; : and (4) sand blasting the formed metal dental crown entity. It should be understood that the metal crown entity formed by the copper alloy has a relatively serious powder adhesion phenomenon, the heating substrate is used for heating, the powder is preheated by utilizing the heating substrate, and the sand blasting is carried out on the metal crown entity, so that the surface of the metal crown entity is smooth.
In addition, in some embodiments, a heating substrate is disposed on the printing platform, and the metal printing powder is disposed on the heating substrate. Further, the metal printing powder is bronze powder, and the method further comprises the following steps: when the step of selectively melting the layer of metal printing powder on the printing platform by emitting the laser with the second predetermined energy value is executed, the heating substrate on the printing platform is heated, so that the tin element of the bronze powder is not segregated in the printing process, and the service life is greatly prolonged. It should be understood that the bronze powder is heated during the printing process, so that the tin element of the bronze powder can be uniformly distributed, and the tin element of the bronze powder can not segregate during the printing process.
In summary, the 3D printing method of the metal dental crown disclosed by the present invention comprises: step a: laying a layer of metal printing powder on the printing platform; step b: emitting laser light with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form a support structure of the metal dental crown; step c: emitting laser with a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a metallic dental crown solid layer connected or disconnected with the support structure; step d: emitting laser with a third preset energy value to carry out multi-pass contour pointing treatment on the metal dental crown solid layer on the printing platform so as to enable the inner surface and the outer surface of the metal dental crown solid layer to be smooth; step e: and c, continuously paving another layer of metal printing powder on the basis of the previous layer of metal printing powder, and continuously executing the step b. Through the mode, when the metal dental crown is printed, the 3D printing method of the metal dental crown carries out multiple contour edge-hooking treatments on each layer of metal dental crown solid layer, so that the inner surface and the outer surface of the metal dental crown solid layer are smooth, the metal dental crown cannot abrade dental pulp, and the user experience is greatly improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A3D printing method of a metal dental crown comprises the steps of setting ST L format data, optimizing the placing angle of the dental crown and setting printing technological parameters, and is characterized by further comprising the following steps:
Step a: laying a layer of metal printing powder on the printing platform;
Step b: emitting laser light with a first predetermined energy value to selectively melt the layer of metal printing powder on the printing platform to form a support structure of the metal dental crown;
Step c: emitting laser light with a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a metallic dental crown solid layer connected or disconnected with the support structure;
Step d: emitting laser with a third preset energy value to carry out multi-pass contour pointing treatment on the metal dental crown solid layer on the printing platform so as to enable the inner surface and the outer surface of the metal dental crown solid layer to be smooth;
Step e: continuously paving another layer of metal printing powder on the basis of the previous layer of metal printing powder;
And c, continuing to execute the steps b to e until the printing of the metal dental crown is finished.
2. The 3D printing method according to claim 1, wherein prior to the step of emitting the laser light having the third predetermined energy value to perform the multiple pass contouring of the solid layer of the metal crown on the printing platform, the method further comprises:
Emitting laser light having a fourth predetermined energy value to partially reflow the solid layer of the metal crown on the printing platform;
The step of emitting laser with a third predetermined energy value to carry out a plurality of contour edge treatment on the metal dental crown solid layer on the printing platform comprises the following steps:
Emitting a laser having a third predetermined energy value to melt the inner and outer surfaces of the solid layer of the metal crown.
3. The 3D printing method according to claim 1, characterized in that the method further comprises:
And emitting laser with a first preset energy value to selectively melt the layer of metal printing powder on the printing platform to form a cross-block-shaped support structure.
4. The 3D printing method according to claim 3, wherein the support structure is a plurality of adjacent support structures in the shape of a cross block.
5. The 3D printing method according to claim 3, further comprising:
And forming a conical support structure on the cross block-shaped support structure.
6. The 3D printing method according to claim 1, wherein the step of emitting laser light having a second predetermined energy value to selectively melt the layer of metallic printing powder on the printing platform to form a metallic crown solid layer connected or disconnected with the support structure comprises:
And controlling the laser head to emit laser with a second preset energy value to sequentially and selectively melt the layer of metal printing powder on the printing platform so as to form a plurality of adjacent metal dental crown solid layers.
7. The 3D printing method according to claim 1, wherein the thickness of each layer of the metallic printing powder is 35 μ ι η to 40 μ ι η.
8. The 3D printing method according to claim 1, wherein the metal printing powder is copper alloy material powder, and a protective lens for blocking reflection of laser light is arranged on the laser head.
9. The 3D printing method according to claim 8, wherein a heated substrate is disposed on the printing platform, the heated substrate having a metal crown entity thereon, the method further comprising:
After the metal dental crown entity is formed, heating the heating substrate to heat the formed metal dental crown entity on the printing platform;
And carrying out sand blasting on the formed metal dental crown entity.
10. The 3D printing method according to claim 1, wherein a heating substrate is disposed on the printing platform, the metal printing powder is disposed on the heating substrate, and the metal printing powder is bronze powder, and the method further comprises:
And heating the heating substrate on the printing platform when the step of selectively melting the layer of metal printing powder on the printing platform by emitting the laser with the second predetermined energy value is executed.
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Address after: Room 101, 1 / F, building B, Hainan industrial and commercial zone, South Zhongnan street, Huadi Avenue, Liwan District, Guangzhou City, Guangdong Province 510000 Patentee after: Guangzhou Ruitong Additive Technology Co., Ltd Address before: Room 217, 2nd Floor, B Scientific Research Building, Nefo High-tech Think Tank Center, Nanhai Software Science Park, Shishan Town, Foshan City, Guangdong Province, 510000 Patentee before: FOSHAN RUIXINTONG TECHNOLOGY Co.,Ltd. |