CN114209460A - Processing method and device of personalized base station - Google Patents
Processing method and device of personalized base station Download PDFInfo
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- CN114209460A CN114209460A CN202111676998.3A CN202111676998A CN114209460A CN 114209460 A CN114209460 A CN 114209460A CN 202111676998 A CN202111676998 A CN 202111676998A CN 114209460 A CN114209460 A CN 114209460A
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- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 238000007639 printing Methods 0.000 claims abstract description 95
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 92
- 239000011265 semifinished product Substances 0.000 claims description 15
- 238000007790 scraping Methods 0.000 claims description 13
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 6
- 238000010146 3D printing Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 239000007943 implant Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
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- 238000003825 pressing Methods 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000004053 dental implant Substances 0.000 description 2
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- 239000002245 particle Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
- A61C13/0019—Production methods using three dimensional printing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
- A61C13/0018—Production methods using laser
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/01—Palates or other bases or supports for the artificial teeth; Making same
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
Abstract
The invention relates to the technical field of 3D metal printing, in particular to a processing method and device of a personalized base station. The specific technical scheme is as follows: the processing method of the personalized base station comprises the steps of printing the upper structure of a semi-finished base station which is arranged on a fixing mechanism in a sliding mode by adopting a laser layering, stacking and selective melting forming process, and carrying out hot isostatic pressing treatment after printing is finished. The invention solves the problem that the complex base station can not be processed by a cutting processing mode.
Description
Technical Field
The invention relates to the technical field of 3D metal printing, in particular to a processing method and device of a personalized base station.
Background
The 3D printing personalized abutment can meet the requirement of the customized abutment in clinical dental implant restoration. Since the alveolar bone condition of each patient and the implant implantation condition of a doctor are different in the implant operation, each of the abutments for the implant upper part restoration should be individually customized according to the patient condition.
The upper portion of mainly adopting restores the base station still corresponds the batchization finished product base station that the plant body producer provided on the market at present, uses the finished product base station still to need to its corresponding grinding adjustment according to the patient condition, nevertheless because the grinding adjustment range is limited, can't cut into one's body and satisfy patient and doctor's demand, simultaneously, artificial adjustment is wasted time and energy, lets plant the repair time longer.
In addition to the grinding adjustment mode of the finished product base station, a personalized base station is also manufactured by cutting a titanium column or a titanium alloy disc in the market. The method is completed through the steps of designing, typesetting and cutting, but the method is still limited to the stroke structure of a machine tool and the size of a material block, and the personalized base station with more complexity and overlarge angle still has the limitation.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a processing method and a device of a personalized base station, and solves the problem that a complex base station cannot be processed by a cutting processing mode.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention discloses a processing method of an individualized base station, which is characterized in that the upper structure of a semi-finished base station which is arranged on a fixing mechanism in a sliding manner is printed by adopting a laser layered superposition selective melting forming process, and hot isostatic pressing treatment is carried out after the printing is finished.
Preferably, the scanning power is 175-250W in the process of printing the upper structure of the base station, and the scanning speed is 900-1100 mm/s.
Preferably, the hot isostatic pressing treatment process comprises the following steps: and preserving the heat for 1-2 h at 920 ℃ under the inert gas atmosphere of 110-120 MPa.
Preferably, ultrasonic cleaning is carried out after hot isostatic pressing treatment, the cleaning temperature is 40-60 ℃, and the ultrasonic time is 10-20 min.
Preferably, the semi-finished product base platform comprises a base platform interface part and a printing platform fixed on the top of the base platform interface part, and the upper structure of the base platform is fixed on the printing platform in a printing mode.
Correspondingly, the processing device for the personalized base station comprises a fixing mechanism, wherein the fixing mechanism comprises a lifting chuck, a connecting port is arranged on the chuck, a substitute body for fixing the semi-finished base station is arranged in the connecting port, and the chuck moves relative to the substitute body; a liftable laser is arranged above the chuck.
Preferably, the chuck plate is correspondingly provided with material containing holes, the material containing holes are arranged on two sides close to the chuck plate, the connecting ports are located between the two material containing holes, at least one of the material containing holes is internally provided with a liftable bottom plate, and a material scraping mechanism which reciprocates between the two material containing holes along the two material containing holes is arranged above the chuck plate.
Preferably, the top of the substitute body is provided with a groove, the center of the bottom of the groove is provided with a through hole penetrating through the substitute body, the bottom of the substitute body is provided with a fixed shell which is hollow inside and communicated with the through hole, the fixed shell is communicated with a pump, and the bottom of the fixed shell is fixed with a support.
Preferably, the scraping mechanism comprises linear driving parts symmetrically arranged on two sides of the chuck, two sliding blocks of the linear driving parts are connected with fixing strips, flexible scraping plates are arranged at the bottoms of the fixing strips, and the flexible scraping plates are larger than the material containing holes in length and are parallel to each other in space.
Preferably, the connectors are provided with a plurality of replacing bodies, each replacing body is fixed on the fixed shell, the bottom of each groove is provided with an annular groove around the through hole, an anti-skid pad is arranged in each annular groove, the top of each replacing body is provided with a circle of flanges around the edge of the top of each replacing body, and the inner wall surfaces of the flanges are inclined planes inclined towards the through holes.
The invention has the following beneficial effects:
1. according to the 3D printing titanium alloy personalized abutment disclosed by the invention, particles are bonded together in a mode of melting titanium alloy metal powder by laser, the upper structure of the personalized abutment is printed on a printing platform on an interface part of the retained titanium alloy abutment layer by layer, and the finally printed upper structure and the printing platform are combined together to form a preset personalized abutment. And after printing is finished, removing residual pores and stress by hot isostatic pressing, and ensuring that the printed base station meets the use strength requirement.
2. The chuck and the substitute body which is arranged on the chuck and used for fixing the semi-finished abutment can print a plurality of personalized abutments at the same time, compared with the traditional grinding or cutting mode, the production efficiency is remarkably improved, and secondly, as the 3D printing mode is adopted, the bonding part of the upper structure of the abutment and the repaired dental crown has a 3D printing natural rough surface, the specific surface area is increased, and the bonding strength of the abutment and the dental crown can be effectively improved. Meanwhile, in the face of various complicated base stations such as a composite base station, a large-angle base station and the like, the problem that the complicated base station cannot be machined in a cutting machining mode is solved by adopting the method for printing the personalized base station in the 3D mode disclosed by the invention.
Drawings
FIG. 1 is a schematic view of a processing apparatus according to the present invention;
FIG. 2 is a top view of FIG. 1 with the laser and support plate removed;
FIG. 3 is a schematic view of a connecting structure of the substitute and the fixing case;
FIG. 4 is a schematic view of the structure of the retaining strip and flexible squeegee;
FIG. 5 is a schematic view of a connection structure of a baffle plate and a mounting plate;
in the figure: the device comprises a base table interface part 1, a printing platform 2, a chuck 3, a connecting port 4, a substitute body 5, a laser 6, a material containing hole 7, a bottom plate 8, a groove 9, a through hole 10, a fixed shell 11, a pump 12, a support column 13, a linear driving part 14, a fixed strip 15, a flexible scraper 16, an anti-slip pad 17, a flange 18, a fixed plate 19, a printing flat plate 20, a slide strip 21, a screw rod 22, a screw nut 23, a fixed block 24, a guide rod 25, a supporting plate 26, a push rod 27, a telescopic mechanism 28, a baffle 29, a mounting plate 30, a material collecting groove 31, a material discharge hole 32, a connecting rod 33, a supporting table 34, a baffle table 35 and a motor 36.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise indicated, the technical means used in the examples are conventional means well known to those skilled in the art.
1. The invention discloses a processing method of an individualized base station, which is characterized in that the upper structure of a semi-finished base station which is arranged on a fixing mechanism in a sliding manner is printed by adopting a laser layered superposition selective melting forming process, and hot isostatic pressing treatment is carried out after the printing is finished. The fixing mechanism moves up and down relative to the semi-finished product base station, TC4 titanium alloy powder (which can be obtained through purchase) is selected as a printing material used when the upper structure of the base station is printed, the particle size of the titanium alloy powder is 30-100 mu m, the scanning power is 175-250W in the printing process, and the scanning speed is 900-1100 mm/s. The hot isostatic pressing treatment process comprises the following steps: and (3) preserving the heat for 1-2 h at 920 ℃ under the inert gas atmosphere of 110-120 MPa, wherein the inert gas is preferably argon. And carrying out ultrasonic cleaning after hot isostatic pressing treatment, wherein the cleaning temperature is 40-60 ℃, and the ultrasonic time is 10-20 min. The semi-finished product base platform comprises a base platform interface part 1 and a printing platform 2 fixed at the top of the base platform interface part 1, the upper structure of the base platform is fixed on the printing platform 2 in a printing mode, and the printing platform 2 is a circular platform. The base interface part 1 is manufactured by high-precision processing equipment, so that the matching between the interface part and the implant is ensured.
The main process of the laser layered overlapping selective melting molding process comprises the following steps: and constructing a model of the upper structure of the abutment according to the condition of the patient, carrying out tomography analysis according to the model to obtain the sectional profile data of the slice layering, and simultaneously generating a laser scanning melting path of each printing layer.
The method comprises the steps of flatly pressing printing materials layer by layer on a fixing mechanism to form a corresponding printing layer, carrying out numerical control laser selective scanning on the printing layer according to a corresponding laser scanning melting path after flatly pressing the printing materials every time so as to enable the printing materials irradiated by laser to be melted and fused with a rough surface on a printing platform, lifting the fixing mechanism by one thickness after the scanning is finished, and flatly pressing the printing layer of the next layer. And after all the layered sections of the upper structure of the base station are formed, taking out the base station, and carrying out hot isostatic pressing treatment and ultrasonic cleaning to finally obtain the personalized and customized base station. The printed abutment has the surface with a rough surface, so that the bonding area of the dental crown and the abutment can be increased, the bonding force is increased, and the dental crown is not easy to fall off in the using process.
It should be noted that: in order to increase the bonding strength between the base platform superstructure and the printing platform, a rough surface is provided on the top surface of the printing platform 2, and the rough surface can be completely covered when the base platform superstructure is printed on the printing platform.
2. Referring to fig. 1-5, the present invention further discloses a processing apparatus for a personalized base platform, comprising a fixing mechanism in a sliding relationship with a semi-finished base platform, wherein the semi-finished base platform comprises a base platform interface part 1 and a printing platform 2 fixed on the top of the base platform interface part 1, the fixing mechanism is arranged on a fixing plate 19, the fixing plate 19 is slidably arranged on a printing plate 20, specifically: the bottom of the fixing plate 19 is provided with a sliding groove, the top of the printing flat plate 20 is provided with a sliding strip 21 matched with the sliding groove, so that the fixing plate 19 can move on the printing flat plate 20 along the sliding groove, the fixing mechanism moves out of the position corresponding to the laser 6, the base station printed on the fixing mechanism can be taken out conveniently, a semi-finished base station is placed, and the next round of printing is carried out.
Specifically, the method comprises the following steps: the fixing mechanism comprises a liftable chuck 3, a connecting port 4 is arranged on the chuck 3, a substitute body 5 for fixing the semi-finished product base station is arranged in the connecting port 4, and the chuck 3 moves up and down relative to the substitute body 5; a liftable laser 6 is arranged above the chuck 3. It should be noted that: the lifting of the chuck 3 can be realized by a screw rod and a nut, namely, the screw rod 22 is arranged on two corresponding sides of the chuck, the screw rod 22 is sleeved and matched with the nut 23, and the nut 23 is fixed on the side wall of the chuck 3. Preferably, in the present embodiment, the screw 22 is disposed at a middle position of both sides of the chuck 3, and the nut 23 is fixed to a middle portion of the side surface of the chuck 3. The other ends of the two lead screws 22 are provided with motors 36, and the controller controls the opening and closing of the two motors 36 simultaneously to realize the stable lifting of the chuck 3.
Further, in order to increase the stability of the chuck during the lifting process, fixing blocks 24 are respectively arranged at the four corners of the chuck 3, sliding holes are vertically arranged on the fixing blocks 24, and meanwhile, guide rods 25 penetrating through the fixing blocks 24 through the sliding holes are arranged on the fixing plate 19. When the chuck 3 is lifted, the chuck moves up and down along the guide rods 25, thereby increasing the stability when the chuck moves up and down. In addition, the number of the screw rods and the screw nuts as well as the number and the installation positions of the guide rods are set according to actual needs, for example, if the screw rods and the screw nuts are arranged at four corners of the chuck, the guide rods do not need to be arranged, but 4 motors need to be controlled to be started simultaneously, if one of the motors is delayed or fails, the chuck cannot be lifted stably or even cannot be lifted, and therefore the number of the motors is reduced selectively in the embodiment, and the occurrence of motor faults is reduced. Meanwhile, a guide rod is additionally arranged to assist the lifting motion of the chuck.
Further, substitute 5 and the adaptation of connector 4 on the chuck 3, all polish to the outer wall of substitute 5 and the inner wall of connector 4 through the polishing to make and laminate more between substitute outer wall and the connector inner wall, reduce the clearance between the two, reduce the condition that printing material dropped to clearance department. In the present invention, the surrogate body 5 is in a fixed state and the chuck 3 is in a state of moving up and down, so that when the chuck 3 moves up, an area formed between the surrogate body 5 and the connection port 4 is an area filled with a printing material, and the laser prints the upper structure of the base on the printing platform 2 in the area. And then the chuck 3 is lifted by a certain thickness, the printing material is filled, the printing layer is flatly pressed, the operation is circulated, the printing of the upper structure of the base station is finally realized, the finished base station is obtained, and the subsequent treatment is carried out on the base station.
Further, the laser 6 is disposed on the support plate 26 and is disposed in correspondence with the printing platform 2. For the lifting movement of the laser, there are various setting modes, for example, the lifting movement can be realized by the matching of a screw rod and a nut, namely, a fixed shaft is arranged at the center of the top of the supporting plate and fixed on the nut, and the screw rod is driven by a motor, so that the lifting of the supporting plate 26 and the lifting of the laser 6 are realized, and the purpose of adjusting the height of the laser 6 is realized. For the present embodiment, a push rod 27 is disposed at the bottom of the supporting plate 26, i.e. the output end of the push rod 27 is fixed at the bottom of the supporting plate 26, and the base of the push rod 27 is disposed on the printing plate 20. The number of the push rods 27 may be determined according to the size of the support plate 26. If the length of the output end of the push rod 27 is insufficient, the length thereof can be increased by fixing a rod member at the output end thereof. The push rod 27 may be an electric push rod, a hydraulic push rod, a cylinder, or the like. Therefore, the lifting of the support plate can be realized in any way. At this time, the fixing plate 19 is slid out of the area corresponding to the supporting plate 26, so that the printed base is taken out for subsequent processing, and the semi-finished base is placed for the next printing.
Furthermore, the concrete arrangement mode of the substitute body and the semi-finished product base platform is as follows: the top of the substitute body 5 is provided with a groove 9, the center of the bottom of the groove 9 is provided with a through hole 10 penetrating through the substitute body 5, the bottom of the substitute body 5 is provided with a fixed shell 11 which is hollow inside and communicated with the through hole 10, the fixed shell 11 is communicated with a pump 12, and the bottom of the fixed shell is fixed with a support 13. It should be noted that: when the semi-finished product base platform is placed, the base platform interface part 1 is inserted into the through hole 10, and the printing platform 2 is placed in the groove 9. Due to the gap between the base interface part 1 and the through hole 10, the base interface part 1 can rock in the through hole 10, and the provided groove 9 can limit the printing platform 2 to a certain extent, thereby increasing the stability of the semi-finished base on the substitute. The support 13 is provided to fix the fixing case 11 together with the dummy body 5 and the semi-finished base to the fixing plate 19. When the chuck 3 moves up and down, the substitute body and the semi-finished base are fixed, so that an area with a certain thickness, namely a printing layer, is formed between the printing platform 2 and the connecting port 4. The pump 12 is preferably a vacuum pump capable of sucking out air in the fixing case 11 and the through hole 10 to fix the semi-finished base to the surrogate body. When the negative pressure state is released, the fixing of the base table or the semi-finished base table is released.
In addition, there is another way to fix the semi-finished base: that is, the outer wall of the base adapter 1 is provided with a screw thread, and the inner wall of the through hole 10 is provided with an internal screw thread, so that the base adapter 1 and the substitute 5 are screwed together. The bottom of the substitute body 5 is fixed to a connecting plate, which is fixed to the fixing plate 19 by means of a support. However, this method of fixing is time-consuming, and if a large number of substitute bodies and semi-finished bases are provided, each of the semi-finished bases needs to be screwed onto the substitute body. Each abutment also needs to be unscrewed after printing is completed. Further, if the base interface 1 has a different size or model, the replacement of the substitute having the corresponding size is required, which is a relatively complicated process and labor-consuming process. Therefore, for the present embodiment, it is preferable to fix the semi-finished product base on the substitute body by negative pressure adsorption, and the whole process is simple and time-consuming.
Further, in order to avoid the untight fit between the printing platform and the groove, which results in the failure to fix the semi-finished base and the substitute well, the bottom of the groove 9 is provided with an annular groove around the through hole 10, and the annular groove is internally provided with a non-slip mat 17 made of rubber material, so that the printing platform and the groove are better fitted. If air leakage exists, the semi-finished abutment and the substitute body can be fixed. When the pressure in the stationary case 11 is stabilized, it is indicated that there is no air leakage. If the pressure changes, the air leakage exists, and the pump 12 can be continuously started at the moment, so that the semi-finished product base platform and the substitute body can be fixed. For monitoring the pressure, a pressure sensor can be inserted into the side wall of the fixed shell 11, and the pressure sensor is connected with a computer or a controller.
Furthermore, in order to avoid the printing material from falling into the gap between the substitute body and the connection port to the maximum extent, a ring of ribs 18 is provided at the top of the substitute body 5 around the edge thereof, and the inner wall surfaces of the ribs 18 are inclined surfaces inclined toward the through-hole 10. The outer side wall of the rib 18 is flush with the outer side wall of the substitute body 5. The provision of the ramp prevents the printing material from resting on the top surface of the rib 18. Of course, a certain distance is reserved between the bottom surface of the inner wall of the rib 18 and the printing platform 2, so that the influence on the laser to print on the printing platform is avoided.
Further, in order to fill the connecting port 4 with the printing material to form a printing layer, the chuck 3 is correspondingly provided with material containing holes 7, and the material containing holes 7 are preferably symmetrically arranged, as shown in fig. 2. The two sides of the material containing holes 7 close to the chuck plate 3 are arranged, the connecting port 4 is positioned between the two material containing holes 7, a liftable bottom plate 8 is arranged in at least one material containing hole 7, and a material scraping mechanism which reciprocates along the two material containing holes 7 is arranged above the chuck plate 3. It should be noted that: printing materials are placed in one of the material containing holes 7, the printing materials in the material containing holes also rise along with the material containing holes in the ascending process of the bottom plate 8 and overflow out of the material containing holes, and the printing materials are scraped into the connecting port by the scraping mechanism to form a printing layer. And the printing material which is redundant or does not enter the connecting port is scraped into the other material containing hole by the scraping mechanism. And to the setting of bottom plate 8, can set up in one of them flourishing material hole, also can both flourish the downthehole setting of material, when all setting up, can change at will and scrape the material mechanism and scrape the direction of printing material to the connector.
Further, the specific lifting setting mode for the bottom plate is as follows: the bottom of the bottom plate 8 is provided with a telescopic mechanism 28, which can be an electric push rod, a hydraulic push rod, a cylinder and other devices for realizing telescopic motion. The output end of the telescoping mechanism 28 is detachably fixed at the center of the bottom plate 8, and the base thereof is fixed on the fixed plate 19. The printing material in the material containing hole 7 is pushed out of the hole by controlling the telescoping mechanism 28.
Furthermore, the printing material in the material containing hole is prevented from falling onto the fixing plate through the gap between the bottom plate and the material containing hole, and waste is avoided. The bottom of the material containing hole 7 is provided with a baffle plate 29, the top of the baffle plate 29 is a plane, the two sides of the baffle plate 29 are inclined planes, and the output rod of the telescopic mechanism 28 penetrates through the center of the baffle plate 29 and is arranged away from the baffle plate. The two sides of the inclined plane of the baffle plate 29 are respectively provided with a mounting plate 30, the bottom of the mounting plate 30 is flush with the bottom of the baffle plate 29, the mounting plate 30 and the baffle plate 29 form an L-shaped clamping table, and the bottom of the material containing hole 7 is just clamped at the L-shaped position formed by the mounting plate 30 and the baffle plate 29, so that the inclined plane of the baffle plate is well attached to the inner wall surface of the material containing hole. The printing material that leaks from between the base plate and the filling hole falls in the area formed between the inclined surface of the baffle 29 and the inner wall of the filling hole 7. When the device is installed, the mounting plate 30 is fixed at the bottom of the chuck 3 through bolts, and two ends of the baffle plate 29 are directly abutted against the inner wall of the material containing hole. The removable mounting of the shutter 29 facilitates cleaning of printed material that falls onto the shutter 29.
Furthermore, in order to prevent the printing material from falling from the other two sides of the chuck, collecting troughs 31 are correspondingly or symmetrically arranged at the two ends of the material containing hole 7 on the top surface of the chuck 3, and the collecting troughs 31 are communicated with the material containing hole 7 through a discharge hole 32. The discharge hole 32 is inclined toward the material containing hole 7 from the material collecting groove 31, so that the printing material falling into the material collecting groove 31 can be conveniently cleaned to the material containing hole 7.
Further, the scraping mechanism comprises linear driving parts 14 symmetrically arranged at two sides of the chuck 3, and the linear driving parts 14 can be parts capable of realizing linear motion, such as an electric sliding rail, an electric stepping table and the like. The linear drive 14 is fixed to the side wall of the chuck 3 by a connecting rod 33. The sliders of the two linear driving pieces 14 are connected with fixing strips 15, flexible scrapers 16 are arranged at the bottoms of the fixing strips 15, the flexible scrapers 16 are made of rubber materials, and the flexible scrapers 16 are longer than the material containing holes 7 and are parallel to each other in space. It should be noted that: in order to increase the strength of the flexible squeegee, the height of the flexible squeegee needs to be reduced. Therefore, a support table 34 is provided between the flexible squeegee 16 and the fixing strip 15, and the support table 34 is made of rubber.
Further, in order to avoid the flexible scraper blade to scrape the printing material to the in-process of connecting port, the printing material falls from the (holding) chuck opposite side, is provided with at (holding) chuck 3 top edge and keeps off platform 35, keeps off platform 35 and is located one side of flourishing material hole 7, and is parallel to each other with flourishing material hole 7. One side of the baffle 35 facing the material containing hole 7 is an inclined surface inclined towards the material containing hole.
Furthermore, the connecting ports 4 are provided with a plurality of replacing bodies 5, each replacing body 5 is fixed on the fixed shell 11, and all the semi-finished product bases can be fixed through the pump 12. In this case, a plurality of lasers 6 are provided, and in the present embodiment, one laser corresponds to one connection port, and all the lasers are controlled by the controller. For the present invention, the semi-finished abutments in one chuck 3 may be of the same type or of different types. If the models are the same, the models of the upper structures of the base stations are the same, the laser scanning melting paths of all the printing layers are the same, and when the lasers are started simultaneously, the upper structures of the base stations can be printed on a plurality of printing platforms simultaneously according to a set program. If the models of the semi-finished product base stations are different, models of upper structures of the semi-finished product base stations of different models need to be built, laser scanning melting paths of all layers of printing layers are generated, then, a laser is started, and the upper structures are printed on the printing platform according to the set paths. The printing mode saves more time and can print a plurality of personalized base stations at one time.
In addition, it should be noted that: if the number of the base stations for one-time printing is too large, the base stations can be printed in different areas, namely, the electric tracks are arranged on the supporting plate 26, and the laser is moved to print the base stations with different types and individuation, such as printing one row or one or more rows or more columns; the laser is moved to the next printing position through the set track, and of course, the setting of the fixed shell can also be controlled in a partition mode, namely, a plurality of pumps 12 are arranged, and the internal pressure of the fixed shell is prevented from being insufficient.
In addition, the shape of the chuck can be changed according to actual needs, and the embodiment only discloses a rectangular case, but of course, the shape can also be cylindrical or polygonal, and the arrangement of the material containing hole and the material scraping mechanism can be changed according to the shape of the chuck.
When the invention is used, the substitute body 5 and the semi-finished product base platform are fixed through the pump 12, and a printing layer is formed on the top of the printing platform 2 when the chuck 3 moves upwards for a certain distance; at the same time, the telescoping mechanism 28 is activated, driving the bottom plate 8 to move upward, pushing out the printing material in the material containing hole 7 to the top of the chuck 3. Here, it should be noted that: when the chuck 3 is moving in an upward direction, the telescopic mechanism 28 may be activated to move the sole plate upwards with the chuck 3 by the same distance. The retraction mechanism 28 may not be activated because of the distance between the base plate 8 and the stop plate 29, and the base plate 8 will move the same distance towards the underside of the material receiving aperture 7 when the chuck 3 is moved upwards, but this has no effect. In addition, it is also noted that: the amount of the printing materials pushed out of the material containing hole 7 by the bottom plate 8 is larger than the sum of the consumption of the printing materials required by each printing layer, so that the condition that some printing layer materials are insufficient is avoided, and the quality of the base station is influenced.
The invention is further illustrated below with reference to specific examples.
Examples
1. The personalized base station is printed by adopting the method 1 and the device 2. According to the invention, as shown in fig. 2, 9 personalized bases with the same model or size are printed at one time. The total printing time is 10min, and the average time is within 1.2 min. The time for processing a personalized base station by adopting the traditional cutting processing mode is about 20 min. Therefore, compared with the traditional process, the processing method disclosed by the invention greatly saves time.
2. The processed personalized abutment is treated by hot isostatic pressing and ultrasonic cleaning in the method 1, and specific treatment parameters are shown in the following table 1.
TABLE 1 subsequent processing parameters for a personalized base station
3. Testing the fatigue limit of the 3D printed personalized base station after heat treatment: after the 3D printed personalized abutment after heat treatment is assembled with a matched dental implant, experiments are carried out according to YY/T0521-2018, the load frequency is 14Hz, and 3 test pieces complete 5000000 times of cyclic load under the action of 241N and are not damaged. The test can prove that the 3D printing personalized abutment technology meets the use requirement of a planting abutment.
4. The properties of the personalized submount after hiping using the parameters shown in table 1 are shown in table 2.
TABLE 2 Effect of Hot isostatic pressing on personalized abutments
As shown in Table 2, the mechanical properties of the material before and after hot isostatic pressing also obviously change, the strength of the material tends to decrease, and the plasticity is increased, which is caused by that the cooling speed is higher in the SLM forming process, a formed part forms more martensite structures, and the martensite decomposes after the hot isostatic pressing annealing, so that the strength of the material decreases and the plasticity increases. Meanwhile, the hardness of the material can also change along with the hot isostatic pressing treatment, and the hardness can be reduced by 5-10% after the hot isostatic pressing treatment. Overall, hot isostatic pressing can improve the toughness and fatigue crack propagation resistance of the material.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The processing method of the personalized base station is characterized by comprising the following steps: and printing the upper structure of the semi-finished product base station which is arranged on the fixing mechanism in a sliding manner by adopting a laser layered overlapping selective melting forming process, and performing hot isostatic pressing treatment after printing.
2. The method of processing a personalized abutment according to claim 1, wherein: the scanning power is 175-250W in the process of printing the upper structure of the base station, and the scanning speed is 900-1100 mm/s.
3. The method of processing a personalized abutment according to claim 1, wherein: the hot isostatic pressing treatment process comprises the following steps: and preserving the heat for 1-2 h at 920 ℃ under the inert gas atmosphere of 110-120 MPa.
4. The method of processing a personalized abutment according to claim 1, wherein: and carrying out ultrasonic cleaning after hot isostatic pressing treatment, wherein the cleaning temperature is 40-60 ℃, and the ultrasonic time is 10-20 min.
5. The method of processing a personalized abutment according to claim 1, wherein: the semi-finished product base station comprises a base station interface part (1) and a printing platform (2) fixed at the top of the base station interface part (1), and the upper structure of the base station is fixed on the printing platform (2) in a printing mode.
6. Individualized base station's processingequipment, its characterized in that: the fixture comprises a fixing mechanism, wherein the fixing mechanism comprises a liftable clamping disc (3), a connecting port (4) is arranged on the clamping disc (3), a substitute body (5) for fixing a semi-finished product base station is arranged in the connecting port (4), and the clamping disc (3) moves relative to the substitute body (5); a liftable laser (6) is arranged above the chuck (3).
7. The apparatus for processing a personalized abutment according to claim 6, wherein: the material containing mechanism is characterized in that material containing holes (7) are correspondingly formed in the chuck plate (3), the material containing holes (7) are arranged on two sides of the chuck plate (3) in a close mode, the connecting ports (4) are located between the material containing holes (7), at least one of the material containing holes is internally provided with a liftable bottom plate (8), and the material scraping mechanism is arranged above the chuck plate (3) and moves in a reciprocating mode between the material containing holes (7) along two sides.
8. The apparatus for processing a personalized abutment according to claim 6, wherein: the top of the substitute body (5) is provided with a groove (9), the bottom center of the groove (9) is provided with a through hole (10) penetrating through the substitute body (5), the bottom of the substitute body (5) is provided with a fixing shell (11) which is hollow inside and communicated with the through hole (10), the fixing shell (11) is communicated with a pump (12), and the bottom of the fixing shell is fixed with a support column (13).
9. The apparatus for processing a personalized abutment according to claim 6, wherein: the scraping mechanism comprises linear driving parts (14) symmetrically arranged on two sides of the chuck (3), two fixing strips (15) are connected to sliding blocks of the linear driving parts (14), flexible scraping plates (16) are arranged at the bottoms of the fixing strips (15), and the flexible scraping plates (16) are larger than the material containing holes (7) in length and are parallel to each other in space.
10. The apparatus for processing a personalized abutment according to claim 6, wherein: the connector (4) is provided with a plurality of connectors, each substitute body (5) is fixed on the fixed shell (11), the bottom of the groove (9) is provided with an annular groove around the through hole (10), an anti-skid pad (17) is arranged in the annular groove, the top of the substitute body (5) is provided with a circle of flanges (18) around the edge of the substitute body, and the inner wall surfaces of the flanges (18) are inclined planes which incline towards the through hole (10).
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Application publication date: 20220322 |