KR101813654B1 - Manufacturing method for intake manifold made by 3d-printing - Google Patents
Manufacturing method for intake manifold made by 3d-printing Download PDFInfo
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- KR101813654B1 KR101813654B1 KR1020150179098A KR20150179098A KR101813654B1 KR 101813654 B1 KR101813654 B1 KR 101813654B1 KR 1020150179098 A KR1020150179098 A KR 1020150179098A KR 20150179098 A KR20150179098 A KR 20150179098A KR 101813654 B1 KR101813654 B1 KR 101813654B1
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- intake manifold
- impregnation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
-
- 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
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
The present invention relates to a method for manufacturing an intake manifold sample manufactured by three-dimensional printing capable of enhancing airtightness of an intake manifold sample for performance test produced by three-dimensional printing using a plastic material, A sample preparation step of producing a sample; A first cleaning step of cleaning the sample made using the three-dimensional printing technique; and a test step of testing the sample, wherein after the first cleaning step, the three-dimensional printing technique And impregnating the impregnation agent only in the cavity of the sample so that the cavity exposed to the outside from the surface or inside of the sample is minimized so that the sample can be used for an intake manifold performance test of a vehicle.
Description
The present invention relates to a method of manufacturing an intake manifold sample manufactured by three-dimensional printing, and more particularly, to a three-dimensional printing method capable of enhancing airtightness of an intake manifold sample for performance test produced by three- And a method for manufacturing an intake manifold sample.
Generally, the molds (molds) made in the existing factory were made and produced in large quantities.
However, the three-dimensional printing technology can produce various products of various shapes and structures without a mold.
As a result, 3D printing technology has become one of the technologies that will lead the tertiary industrial revolution following internal combustion engines and computers by replacing traditional mold manufacturing (CNC) devices with time and cost savings in prototype manufacturing .
This 3D printing technology has been developed in the 1980s and has evolved into various methods and technologies such as SLA (Stereo Lithography Apparatus) method, SLS (Selective Laser Sinternign) method and FDM (Fused Deposition Modeling) method, As the period expires, it is evolving into a personal 3D printer that anyone can use freely and freely.
Among them, the FDM-type three-dimensional printing technology is inexpensive compared with the SLA and SLA-based three-dimensional printing technology, and is popularized and popularized.
On the other hand, intake manifold samples for performance testing of intake manifolds were generally manufactured through casting using materials such as aluminum.
Such a production method is costly due to manufacturing cost, mold cost, and Zigbee, and overall production time is low due to a long production time such as a time for producing a mold and a production of a product using the same after the production of a mold.
Due to these problems, in recent years, the intake manifold samples for performance test have been produced by using the FDM method, which is a cost-effective production method among the three-dimensional printing methods, thereby saving time and cost.
However, the FDM-type 3D printing technology can not produce the final product of the clean surface because the surface of the material that accumulates the material is left on the surface of the product during the production process, and the post-processing (surface treatment) There is a problem that manpower is required.
In the FDM type three-dimensional printing technique, filament type wires made of a thermoplastic material are laminated in a lattice form, and a cavity is formed between the layers, and leakage occurs in the sample for the intake manifold.
As a result, there is a problem that the reliability is low.
For the above reasons, in the field of the related art, there is an attempt to improve the reliability of the intake manifold for the performance test by increasing the airtightness of the intake manifold samples for the performance test produced by 3D printing. However, until now, .
An object of the present invention is to provide an intake manifold sample manufactured by three-dimensional printing using a plastic material to improve airtightness of an intake manifold sample for performance test Method.
A method of manufacturing an intake manifold sample manufactured by three-dimensional printing according to an embodiment of the present invention includes: preparing a sample using a three-dimensional printing technique; A first cleaning step of cleaning the sample made using the three-dimensional printing technique; and a test step of testing the sample, wherein after the first cleaning step, the three-dimensional printing technique And impregnating the impregnation agent only in the cavity of the sample so that the cavity exposed to the outside from the surface or inside of the sample is minimized so that the sample can be used for an intake manifold performance test of a vehicle.
The three-dimensional printing technique forms an intake manifold for performance test by FDM (FUSED DEPOSITION MODELING) method.
The material of the sample is an engineering plastics which is integrated with the impregnating agent through the impregnation step.
Wherein the impregnating step includes the steps of receiving the sample having the cavity in the impregnation tank by the three-dimensional printing technique in the sample producing step, applying a pressure of 0.5 bar to the cavity formed in the sample for 5 minutes, A vacuum stage to extract; An impregnation step in which the impregnant is injected into the impregnation tank in which the vacuum is maintained by the vacuum step to immerse the sample; Applying a pressure of 0.8 bar to the impregnant filled in the cavity so that the impregnant is filled in the cavity of the sample by applying pressure to the impregnated tank in which the impregnant is injected; A second cleaning step of moving the sample from the impregnation tank to the cleaning tank and washing the sample filled with the impregnant into the cavity; And a curing step of moving the cleaning tank from the cleaning tank to a hardening tank to cure the cleaned sample, wherein the second cleaning step is performed for 20 minutes, and the curing step comprises: The composition is cured for 15 minutes at a temperature of not less than 87 degrees and not more than 96 degrees in a hot-water curing system.
The impregnating agent is any one of water glass, silicates (silicate), acrylic, and unsaturated polyester.
Wherein the testing step comprises: a mounting step of mounting the sample filled with the impregnation agent in the cavity to the intake manifold leakage tester by the impregnation step; A step of applying a test liquid to the sample mounted on the intake manifold leakage tester; a negative pressure step of applying a negative pressure of 600 mmHg to the sample to which the test liquid is applied for 25 seconds; A measuring step of measuring a trapped amount of gas leaking from the sample to which negative pressure is applied; And a determining step of determining whether the gas is normal or defective according to the collected amount of the gas measured in the measuring step.
The determining step determines that the trapped amount of the gas leaking from the sample is less than 30 sccm, and determines that the trapped amount of the gas leaking from the sample is greater than 30 sccm.
If it is determined that the trapped amount of gas leaking from the sample is defective, the sample is re-executed in the applying step.
The trapped gas collected from the sample is collected using a mass cylinder (MEASURING CYLINDER).
The product is manufactured by a method of manufacturing an intake manifold sample manufactured by three-dimensional printing.
The method of manufacturing an intake manifold sample manufactured by three-dimensional printing according to the present invention is characterized in that the vacuum step applies a pressure of about 0.5 bar below the pressure of about 1 bar to the cavity of the sample for 5 minutes, It is possible to prevent the shape from being deformed.
The pressure is applied to the infiltrating agent filled in the cavity for 15 minutes at a pressure of about 0.8 bar, which is lower than the pressure of about 4 bar, thereby preventing the sample from being damaged or deforming the shape of the sample.
The second washing step has the effect that the sample is washed for about 20 minutes so that the sample can be easily washed without breaking or deforming the shape of the sample.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing steps of manufacturing an intake manifold sample for a performance test according to an embodiment of the present invention; FIG.
2 is a block diagram showing the impregnation step shown in Fig.
3 is a block diagram showing the test steps shown in Fig.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined by the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a block diagram showing a manufacturing step of an intake manifold sample for performance test according to an embodiment of the present invention, FIG. 2 is a block diagram showing the impregnating step shown in FIG. 1, Fig.
Referring to FIGS. 1 to 3, a method for manufacturing an intake manifold sample manufactured by three-dimensional printing includes a sample making step S100, a first washing step S200, an impregnating step S300, and a testing step S400 .
The sample production step S100 is a step of producing a sample using the 3D printing technique.
On the other hand, the three-dimensional printing technique is to form an intake manifold sample for performance test by FDM (FUSED DEPOSITION MODELING) method.
The FDM method is a method of melting a thermoplastic material in a nozzle, outputting it as a thin film, and then laminating it.
In this embodiment, by forming an intake manifold sample for the performance test by the FDM method, an SLA (STEREOLITHOGRAPHY) for curing the laser by projecting the laser to the water tank containing the photo-curable liquid resin, and a powder applied to the bed, And the SLS (SELECTIVE LASER SINTERNING) method in which the powder at the right portion is sintered and bonded, and the process is repeatedly laminated, is relatively inexpensive and quick in time than the various three-dimensional printing technique methods, A sample can be produced.
Meanwhile, the material of the sample is preferably made of an engineering plastic (an engineering plastic) integrated with the impregnating agent through the impregnating step (S300).
The first cleaning step S200 is a step of cleaning the sample fabricated using the three-dimensional printing technique.
The impregnation step S300 may be performed after the first cleaning step S200 by minimizing the cavity exposed to the outside from the surface or inside of the sample produced by the three dimensional printing technique in the sample production step S100, The step of making it usable for the intake manifold performance test, wherein only the cavity of the sample is filled with the impregnation agent.
This impregnation step S300 includes a vacuum step S310, an immersion step S320, a pressurization step S330, a second cleaning step S340 and a curing step S350 as shown in FIG.
The vacuum step S310 is a step of receiving a sample having a cavity by a three-dimensional printing technique in a sample making step S100 in an impregnation tank and applying pressure to the cavity formed in the sample to extract air from the cavity.
Here, the conventional impregnation process is such that the pressure applied to the cavity is normally applied at a pressure of about 1 bar for 5 minutes, which is the pressure applied to the sample made of a metal material such as aluminum.
On the other hand, the sample used in this embodiment is a material such as plastic.
Therefore, if the same pressure is continuously applied, there is a problem that the sample is broken or the shape of the sample is deformed.
Thus, the vacuum step S310 of this embodiment applies a pressure less than a pressure of about 1 bar, thereby preventing the sample from breaking or deforming the shape of the sample.
More specifically, the pressure of the vacuum step S310 used in this embodiment is preferably applied to the cavity of the sample for about 5 minutes at a pressure of about 0.5 bar.
The immersion step S320 is a step in which the sample is immersed in the impregnation tank in which the vacuum is maintained by the vacuum step S310.
Here, the impregnating agent is preferably made of any one of water glass, silicates (silicate), acrylic, and saturated polyester.
In the pressing step S330, pressure is applied to the impregnant filled in the cavity so that the impregnant is filled in the cavity of the sample by applying pressure to the impregnation tank into which the impregnant is injected.
Here, the conventional pressing step S330 is to apply a pressure of about 4 bar to the cavity for 15 minutes, which is the pressure applied to the sample made of a metal material such as aluminum as described above.
Therefore, there is a problem that if the same pressure is continuously applied to the sample made of the plastic used in this embodiment, breakage of the sample or shape of the sample is deformed.
Therefore, this embodiment applies a pressure lower than a pressure of about 4 bar, thereby preventing the sample from breaking or deforming the shape of the sample.
More specifically, the pressure of the pressing step S330 used in this embodiment is preferably applied to the impregnant filled in the cavity for about 15 minutes at a pressure of about 0.8 bar.
The second cleaning step S340 is a step of moving the sample from the impregnation tank to the washing tank and washing the sample filled with the impregnant into the cavity.
Here, in the conventional second washing step (S340), after proceeding for about 9 minutes, a centrifugal separation method was applied.
This is because it is used for a sample made of a metal such as aluminum as described above. When the centrifugal separation method is applied to the sample made of the plastic used in the present embodiment, the breakage of the sample or the shape of the sample is deformed there is a problem.
Therefore, the second cleaning step (S340) of this embodiment cleans the sample for about 20 minutes.
This makes it possible to easily clean the sample without damaging or deforming the shape of the sample.
The curing step S350 is a step of moving from the washing tank to the hardening tank to cure the washed sample.
Here, in the curing step (S350), the impregnant filled in the cavity of the sample is cured for 15 minutes at a temperature of not less than 87 degrees and not more than 96 degrees by a hot-water curing method.
In the following table, the intake manifold samples for the performance test manufactured by the aluminum casting method and the intake manifold samples for the performance test to which the impregnation step (S300) is applied and the intake manifold samples for the performance test to which the impregnation step (S300) Table 3 shows the results of the leakage test.
<Table 1>
On the other hand, as shown in Table 1, the sample of the intake manifold for performance test manufactured by the casting method of aluminum material has high airtightness because the sample is leaked less from the sample as the pressure becomes higher, It is a sample.
Therefore, the closer to the sample of the intake manifold for performance test manufactured by the casting method of the aluminum material, the less leaked the sample.
As shown in Table 1, the intake manifold samples for the performance test made of engineering plastics are similar to the intake manifold samples for the performance test manufactured by the casting method of the aluminum material than the intake manifold samples for the performance test without the impregnation step (S300) And close experimental results were obtained.
This is because the impregnation step (S300) is applied to the intake manifold sample for performance test made of plastic, thereby ensuring the airtightness close to the intake manifold sample for performance test manufactured by the casting method of aluminum material, The reliability of the manufactured intake manifold sample can be improved.
The test step (S400) is a step of testing a sample manufactured using the three-dimensional printing technique.
The test step S400 includes a mounting step S410, a coating step S420, and a determining step S450 as shown in FIG.
The mounting step S410 is a step of mounting the sample filled with the impregnation agent in the cavity to the intake manifold leakage tester by the impregnation step S300.
The applying step S420 is a step of applying the test liquid to the sample mounted on the intake manifold leakage testing machine.
Here, it is preferable to use a test liquid such as a soapy water or a neutral detergent in which foam is generated.
The negative pressure step (S430) is a step of applying a negative pressure to the sample to which the test liquid is applied.
Here, the negative pressure step (S430) applies a negative pressure of 600 mmHg to the sample to which the test liquid is applied for 25 seconds.
The measuring step S440 is a step of measuring the trapped amount of the gas leaking from the sample to which the negative pressure is applied.
The determining step S450 is a step of determining whether the collected amount of gas measured from the measuring step S440 is normal or defective.
If it is determined in step S450 that the trapped amount of the gas leaking from the sample is less than 30 sccm as shown in FIG. 3, it is determined to be normal (S460)
If it is determined in step S450 that the trapped amount of the gas leaking from the sample is greater than 30 sccm (S470)
At this time, if it is determined that the trapped amount of the gas leaking from the sample is defective, the plate step re-executes the sample applying step (S420).
On the other hand, it is preferable that the trapped gas collected from the sample is collected using a mass cylinder.
As described above, in the method for manufacturing the intake manifold according to the present invention, the vacuum step S310 applies a pressure of about 0.5 bar, which is lower than the pressure of about 1 bar, to the sample cavity for 5 minutes It is possible to prevent the sample from being damaged or deforming the shape of the sample.
By applying a pressure of about 0.8 bar, which is lower than the pressure of about 4 bar, to the infiltrating agent filled in the cavity for 15 minutes, the pressing step (S330) can prevent the sample from being broken or deforming the shape of the sample.
The second cleaning step S340 can easily clean the sample without rupturing or deforming the shape of the sample by washing the sample for about 20 minutes.
The present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the technical idea of the present invention.
Claims (10)
A first washing step of washing the sample prepared using the three-dimensional printing technique;
And a test step for testing the sample,
After the first cleaning step, the sample exposed to the outside from the surface or the inside of the sample made by the three-dimensional printing technique in the sample manufacturing step can be minimized to use the sample for the intake manifold performance test of a vehicle And the impregnation agent is filled only in the cavity of the sample,
In the impregnating step,
A vacuum step of receiving the sample having the cavity in the impregnation tank by the three-dimensional printing technique in the sample producing step and applying a pressure of 0.5 bar to the cavity formed in the sample for 5 minutes to remove air from the cavity;
An impregnation step in which the impregnant is injected into the impregnation tank in which the vacuum is maintained by the vacuum step to immerse the sample;
Applying a pressure of 0.8 bar to the impregnant filled in the cavity so that the impregnant is filled in the cavity of the sample by applying pressure to the impregnated tank in which the impregnant is injected;
A second cleaning step of moving the sample from the impregnation tank to the cleaning tank and washing the sample filled with the impregnant into the cavity;
And a curing step of moving from the washing tank to the hardening tank to cure the washed sample
Wherein the method comprises the steps of:
FDM (FUSED DEPOSITION MODELING) to form an intake manifold for performance test
Wherein the method comprises the steps of:
An ENGINEERING PLASTICS, which is integrated with the impregnating agent through the impregnation step,
Wherein the method comprises the steps of:
Washed for 20 minutes,
Wherein the curing step comprises:
The impregnant filled in the cavity of the sample is cured for 15 minutes at a temperature of not less than 87 degrees and not more than 96 degrees by a hot-
Wherein the method comprises the steps of:
Waterglass, Silicates (silicate), Acrylic or Unsaturated Polyester
Wherein the method comprises the steps of:
A mounting step of mounting the sample filled with the impregnation agent in the cavity to the intake manifold leakage tester by the impregnating step;
A step of applying a test liquid to the sample mounted on the intake manifold leakage tester;
A negative pressure step in which a negative pressure of 600 mmHg is applied to the sample to which the test liquid is applied for 25 seconds;
A measuring step of measuring a trapped amount of gas leaking from the sample to which negative pressure is applied;
And a determination step of determining a normal state or a failure state according to the collected amount of the gas measured in the measuring step
Wherein the method comprises the steps of:
It is judged as normal when the trapped amount of gas leaking from the sample is less than 30 sccm, and it is judged as bad when the trapped amount of the gas leaked from the sample is more than 30 sccm
Wherein the method comprises the steps of:
If it is determined that the trapped amount of gas leaking from the sample is defective, the sample is re-executed in the applying step
Wherein the method comprises the steps of:
The trapped gas from the sample is collected using a mass cylinder (MEASURING CYLINDER)
Wherein the method comprises the steps of:
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| US20220063152A1 (en) * | 2020-09-03 | 2022-03-03 | Robert Thiessen | Method of post manufacture processing of 3d printed parts |
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| KR102244372B1 (en) | 2019-12-11 | 2021-04-26 | 부산대학교 산학협력단 | Apparatus and method of asimmetric internal pressure resistant test |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001162351A (en) * | 1999-12-08 | 2001-06-19 | Tsutsui Plastic:Kk | Method of manufacturing powder-molded product reinforced with chemical combination of impregnated liquid |
| JP2005335380A (en) * | 2004-04-28 | 2005-12-08 | Nissan Motor Co Ltd | Method and apparatus for extruding and laminating molten resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001162351A (en) * | 1999-12-08 | 2001-06-19 | Tsutsui Plastic:Kk | Method of manufacturing powder-molded product reinforced with chemical combination of impregnated liquid |
| JP2005335380A (en) * | 2004-04-28 | 2005-12-08 | Nissan Motor Co Ltd | Method and apparatus for extruding and laminating molten resin |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220063152A1 (en) * | 2020-09-03 | 2022-03-03 | Robert Thiessen | Method of post manufacture processing of 3d printed parts |
| US11911937B2 (en) * | 2020-09-03 | 2024-02-27 | Robert Thiessen | Method of post manufacture processing of 3D printed parts |
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| E601 | Decision to refuse application | ||
| AMND | Amendment | ||
| X701 | Decision to grant (after re-examination) | ||
| GRNT | Written decision to grant |