CN116540955B - Printing interruption fault processing method, medium and equipment for additive manufacturing - Google Patents
Printing interruption fault processing method, medium and equipment for additive manufacturing Download PDFInfo
- Publication number
- CN116540955B CN116540955B CN202310432074.1A CN202310432074A CN116540955B CN 116540955 B CN116540955 B CN 116540955B CN 202310432074 A CN202310432074 A CN 202310432074A CN 116540955 B CN116540955 B CN 116540955B
- Authority
- CN
- China
- Prior art keywords
- correction
- model
- theoretical
- fault
- interruption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007639 printing Methods 0.000 title claims abstract description 74
- 239000000654 additive Substances 0.000 title claims abstract description 27
- 230000000996 additive effect Effects 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000003672 processing method Methods 0.000 title abstract description 6
- 238000012937 correction Methods 0.000 claims abstract description 207
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000010410 layer Substances 0.000 claims description 112
- 239000002356 single layer Substances 0.000 claims description 17
- 238000004590 computer program Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910003407 AlSi10Mg Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/121—Facilitating exception or error detection and recovery, e.g. fault, media or consumables depleted
-
- 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
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1244—Job translation or job parsing, e.g. page banding
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Geometry (AREA)
- Software Systems (AREA)
- Computer Graphics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
Abstract
The invention relates to the technical field of metal additive manufacturing, and discloses a printing interruption fault processing method, medium and equipment for additive manufacturing, wherein the method comprises the following steps: acquiring a theoretical model and printing parameters before printing interruption; judging that if the interruption time exceeds the interruption threshold value, acquiring theoretical fault information according to the information; then removing powder on the surface of the actual fault according to the theoretical fault information; the method comprises the steps of obtaining actual fault information and theoretical faults for comparison, and obtaining lateral offset of the actual fault information and the theoretical faults; if the maximum transverse offset is less than or equal to the wall thickness tolerance alpha, restarting printing according to a theoretical model; if the wall thickness tolerance alpha is less than the maximum transverse offset and less than the shape tolerance beta, a correction model which increases the coincidence degree with the theoretical model along with the increase of the printing layer number is established based on the actual fault, the part is printed according to the correction model, and the part is printed according to the theoretical model after the part is coincident with the theoretical model; if the maximum lateral offset is greater than the form tolerance β, then the operation is not performed.
Description
Technical Field
The invention relates to the technical field of metal additive manufacturing, in particular to a printing interruption fault processing method, medium and equipment for additive manufacturing.
Background
The metal additive manufacturing technology adopts computer graphics software to design a three-dimensional model of a part, then uses the software to add supporting strips, slices the supporting strips into two-dimensional graphics layer by layer, melts powder layer by laser beam to perform laser sintering, stacks the layers layer by layer, and completes the manufacturing of the three-dimensional model.
The metallurgical and thermophysical processes in the additive manufacturing and forming process are very complex, involve the multi-physical-quantity field coupling auxiliary processes such as a temperature field, a stress field, a speed field and the like, and the parts undergo unbalanced thermodynamic processes such as periodicity, violent, unsteady state, cyclic heating, cooling and the like of high-energy laser for a long time, so that the size control difficulty is high. When the additive is manufactured and formed, the middle section of the printing process is inevitably caused by equipment failure, oxygen content increase, argon interruption, power failure and other reasons. If the printing interruption time is too long, if the printing interruption time exceeds 1h, the temperature of the part is reduced, the part is easy to deform under the influence of thermal stress, residual stress and the like, and particularly, the part is more obvious for thin-wall parts. After the part printing interruption generates deformation, if the original model is adopted to continue printing, a certain degree of dislocation can be generated between the part printed below and the part printed subsequently, and when the dislocation exceeds the thickness tolerance of the part, the thickness of the part after polishing is ultrathin, and the part is scrapped. Referring to the thin-walled part with an interruption of the printing process shown in fig. 1, the thickness of the part is 1mm, the dislocation of the part caused by the interruption of printing is about 0.4mm, the thickness of the part after polishing is only 0.6mm, the thickness of the part does not meet the thickness tolerance requirement of the part, and the part cannot be used.
Therefore, when the additive manufacturing printing is interrupted for a long time, certain remedial measures are needed to avoid the ultrathin thickness of the part and scrapping of the part due to dislocation.
Disclosure of Invention
The invention aims to provide a fault processing method, medium and equipment for printing interruption of additive manufacturing, which are used for identifying a two-dimensional graph of a formed part through an image before restarting a printing process, comparing the two-dimensional graph with a theoretical model, and gradually correcting a subsequent printing model according to the difference between the two models so as to realize accurate forming after printing interruption.
The invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for handling print interruption faults in additive manufacturing, comprising the following specific steps:
S1: obtaining a theoretical model, an interruption layer number, interruption time, an interruption threshold value, a wall thickness tolerance alpha, a profile tolerance beta, a printing layer thickness lambda and a supporting critical inclination delta;
s2: if the interruption time exceeds the interruption threshold value, according to the theory
Model, interrupting the layer number and acquiring theoretical fault information;
S3: according to the theoretical fault information, removing powder on the surface of an actual fault; the theoretical fault information comprises the shape, the size and the position of the fault, and the difference between the theoretical fault and the actual fault is not too large, so that a powder suction opening of the powder absorption system can be controlled to reach the vicinity of the actual fault according to the theoretical fault information, powder in the width range of 0-10 mm of the actual fault and the vicinity of the actual fault is absorbed, and the powder is sent into a powder recovery cabin after the powder on the surface of the actual fault of the part is absorbed.
S4: acquiring actual fault information, comparing the actual fault with the theoretical fault, and acquiring transverse offset of the actual fault relative to the theoretical symmetry;
s5: before restarting printing, restarting printing according to a theoretical model based on an actual fault if the maximum transverse offset is less than or equal to the wall thickness tolerance alpha; if the wall thickness tolerance alpha is less than the maximum transverse offset and less than the shape tolerance beta, a correction model with the increased overlap ratio with the theoretical model along with the increase of the printing layer number is established based on the actual fault, printing is restarted according to the correction model, and the part is printed according to the theoretical model after overlapping with the theoretical model; if the maximum lateral offset is greater than the form tolerance β, then the operation is not performed.
In one embodiment, the support critical inclination angle δ=40° to 50 °.
In one embodiment, in S5, the lateral correction direction of the correction model points to the theoretical fault from the actual fault, the lateral correction amount of the correction model is Δl, the single-layer correction amounts of adjacent correction layers of the correction model are all denoted as Lx, the correction layer number of the correction model is denoted as M, the thickness of each correction layer of the correction model is set as λ, and the correction inclination angle of the correction model is θ; in order to ensure that the printing is not supported according to the correction model, the correction inclination angle theta is smaller than or equal to the support critical inclination angle delta, the single-layer correction quantity Lx=lambda×cottheta is smaller than or equal to lambda×cotdelta in the correction model, and the correction layer number M=delta L/(lambda×cottheta) is larger than or equal to delta L/(lambda×cotdelta).
In one embodiment, in S5, when the shape of each correction layer of the correction model is the same, the correction layer number M is greater than or equal to Δl/(λ×cotδ), where the value of M is rounded up.
In one embodiment, to improve the surface smoothness of the part after restarting printing, the minimum correction layer number m=σxΔl/(λ×cotδ) of the correction model is adjusted, where σ is an adjustment coefficient, σ is greater than or equal to 1, and the value of M is rounded up.
In one embodiment, in S5, when the shape sizes of the correction layers of the correction model are not identical, the minimum correction layer number m=σxΔl/(λ×cotδ) of the correction model is adjusted, where σ is an adjustment coefficient, σ is greater than or equal to 1, and M is rounded up.
In one embodiment, if the measured correction inclination angle θ of the correction model is smaller than the support critical inclination angle δ, the minimum correction layer number m=σxΔl/(λ×cot δ) +i of the correction model is adjusted, where the initial value of i is 1, until the measured correction inclination angle θ of the correction model is greater than or equal to the support critical inclination angle δ.
In one embodiment, if the adjustment coefficient σ is 10, the minimum correction layer number of the correction model is m=10Δl/(λ×cotδ); at this time, if the correction inclination angle θ of the correction model is smaller than the support critical angle δ, the support critical inclination angle δ is reduced, and the single-layer correction amount lx=λ×cotθ of the new correction model is obtained from the new support critical angle δ.
In a second aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements an additive manufacturing print interruption fault handling method as described above.
In a third aspect, the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the method for processing an additive manufacturing print interruption fault when executing the computer program.
Compared with the prior art, the invention has the following advantages:
When the part is subjected to long-time printing interruption, particularly a thin-wall part, the part is more prone to deformation, the part is easy to deform after the part is subjected to long-time printing interruption, particularly the thin-wall part, through collecting actual fault information and comparing the actual fault information with a theoretical fault, and the part is easy to deform.
Drawings
The following description of the embodiments will be made apparent, and should not be taken in all embodiments, to the extent that the embodiments described are defined in detail in connection with the accompanying drawings.
FIG. 1 is a photograph of a thin-walled part with print interruption in an additive manufacturing print interruption fault handling method provided by the invention;
FIG. 2 is a photograph of a thin-walled part of a conduit with print interruption in an additive manufacturing print interruption fault handling method provided by the invention;
FIG. 3 is a schematic diagram of an additive manufacturing print interruption fault handling method according to the present invention;
FIG. 4 is a schematic illustration of the placement of titanium alloy conduit parts in accordance with the present invention;
FIG. 5 is a schematic illustration of a titanium alloy catheter component of the present invention with print breaks and misplacement of print layers at the break locations;
FIG. 6 is a schematic diagram showing a comparison of actual and theoretical faults of a titanium alloy catheter according to the present invention;
fig. 7 is a schematic diagram of a correction model when the adjustment coefficient σ=1;
FIG. 8 is an enlarged schematic view of a portion of FIG. 7 at A;
fig. 9 is a schematic diagram of a correction model when the adjustment coefficient σ=3;
FIG. 10 is an enlarged schematic view of a portion of FIG. 9B;
FIG. 11 is a schematic illustration of a thin-walled conical shell part in print placement and with print interruption;
Fig. 12 is a schematic diagram of a correction model when the adjustment coefficient σ=1.2 of the schematic diagram is partially enlarged in fig. 10C;
fig. 13 shows a thin-walled conical shell part correction model with a lateral offset of less than the profile tolerance β=1.5 mm.
Detailed Description
The foregoing and other objects of the invention will be further described in detail in connection with the following detailed description of the examples. It should not be understood that the scope of the above subject matter of the present invention is limited to the following examples only. Various substitutions and alterations are also possible, without departing from the spirit of the invention, and are intended to be within the scope of the invention.
In the modeling process in the following embodiment, as shown in fig. 3, the nth layer of the number of print layers is a print fault position, the n+1th layer to the n+mth layer are correction models, the print layer larger than the n+mth layer is a theoretical model, and the correction models overlap with the theoretical model in the n+mth layer.
Example 1:
The embodiment provides a printing interruption fault processing method for additive manufacturing, which comprises the following specific steps:
S1: obtaining a theoretical model, an interruption layer number, interruption time, an interruption threshold value, a wall thickness tolerance alpha, a profile tolerance beta, a printing layer thickness lambda and a supporting critical inclination delta;
S2: if the interruption time exceeds the interruption threshold value, acquiring theoretical fault information according to the theoretical model and the interruption layer number;
s3: according to the theoretical fault information, removing powder on the surface of an actual fault;
S4: acquiring actual fault information, comparing the actual fault with the theoretical fault, and acquiring transverse offset of the actual fault relative to the theoretical symmetry; when the powder on the surface and around the actual fault is removed, image information is acquired through an industrial camera and is uploaded to a data processing system, the data processing system extracts an actual fault picture, and a two-dimensional model of a theoretical fault is called to be compared with the actual fault to obtain the transverse offset of the actual fault and the theoretical fault; in practical implementation, for convenience of comparison, a calibration point is arranged in the equipment forming cabin, and an industrial camera can record an actual tomogram and the calibration point at the same time when acquiring an image, so that the relative position of an actual part is identified; and the two-dimensional models of all the printing layers of the theoretical model are also provided with calibration points, and when the two calibration points are compared, the actual fault and the theoretical section fault are compared, so that the transverse offset of the actual fault and the theoretical model can be rapidly identified.
S5: before restarting printing, if the maximum transverse offset is less than or equal to the wall thickness tolerance alpha, and the actual part and the theoretical model are within the allowable wall thickness tolerance alpha at the moment without correction, restarting printing according to the theoretical model based on the actual fault; if the wall thickness tolerance alpha is smaller than the maximum transverse offset and smaller than the shape tolerance beta, the fact that the deviation between the actual part and the theoretical model is larger is indicated, if the printing is continued without correction, the dislocation of the actual part is finally obtained, the wall thickness of the actual part after polishing is smaller than a set value, and therefore correction is needed, a correction model with the increased overlap ratio with the theoretical model along with the increase of the number of printing layers is established on the basis of an actual fault, printing is restarted according to the correction model, and the part is printed according to the theoretical model after the overlap ratio with the theoretical model is increased; if the maximum lateral offset is greater than the form tolerance β, then the operation is not performed.
Example 2:
The embodiment is further optimized based on embodiment 1, the supporting critical inclination delta=40-50 degrees, the supporting critical angle is the minimum inclination of the side wall of the part and the plane of the substrate, which can be directly printed without support, the supporting critical angle is selected to be 40-50 degrees, and the specific numerical value is different according to different process parameters and different printing equipment, and the selected supporting critical inclination is also different.
Example 3:
The embodiment is further optimized based on embodiment 1, in S5, the lateral correction direction of the correction model points to the theoretical fault from the actual fault, the lateral correction amount of the correction model is Δl, the single-layer correction amounts of adjacent correction layers of the correction model are all denoted as Lx, the number of correction layers of the correction model is denoted as M, the thickness of each correction layer of the correction model is set as λ, and the correction inclination angle of the correction model is θ; in order to ensure that the printing is not supported according to the correction model, the correction inclination angle theta is smaller than or equal to the support critical inclination angle delta, the single-layer correction quantity Lx=lambda×cottheta is smaller than or equal to lambda×cotdelta in the correction model, and the correction layer number M=delta L/(lambda×cottheta) is larger than or equal to delta L/(lambda×cotdelta). When the correction is performed, the correction model performs offset correction layer by layer on the basis of an actual part, and the outer contour of the correction model is formed by connecting the middle section edge of an actual fault to the middle section edge of an M layer of the correction model.
Example 4:
the embodiment is further optimized based on embodiment 3, and in S5, when the shapes and sizes of the correction layers of the correction model are the same, as shown in fig. 1 and fig. 2, the number of correction layers M is equal to or greater than Δl/(λ×cotδ), where the value of M is rounded up.
In order to improve the surface smoothness of the part after restarting printing, the minimum correction layer number M=sigma×DeltaL/(lambda×cotdelta) of the correction model is adjusted, wherein sigma is an adjustment coefficient, sigma is more than or equal to 1, and the value of M is rounded upwards.
Example 5:
In the embodiment, the method is further optimized based on embodiment 3, and in S5, when the shapes and sizes of the correction layers of the correction model are not completely the same, such as a triangular pyramid, the minimum correction layer number m=σxΔl/(λ×cotδ) of the correction model is adjusted, where σ is an adjustment coefficient, σ is greater than or equal to 1, and M is rounded upward.
And if the measured correction inclination angle theta of the correction model is smaller than the supporting critical inclination angle delta, adjusting the minimum correction layer number M=sigma×delta L/(lambda×cotdelta) +i of the correction model, and rounding up the M, wherein the initial value of i is 1 until the measured correction inclination angle theta of the correction model is larger than or equal to the supporting critical inclination angle delta.
Taking the maximum value of the adjustment coefficient sigma to be 10, and setting the minimum correction layer number of the correction model to be M=10DeltaL/(lambda×cotdelta); at this time, if the correction inclination angle θ of the correction model is smaller than the support critical angle δ, the support critical inclination angle δ is reduced, and the single-layer correction amount lx=λ×cotθ of the new correction model is obtained from the new support critical angle δ.
And (6) implementation:
In the embodiment, a TC4 titanium alloy conduit part shown in fig. 2 and 4 is formed by adopting a laser selective melting technology, and a theoretical model and technological parameters of the part are obtained to obtain that the wall thickness L of the conduit part is 1mm and the wall thickness tolerance alpha is +/-0.15 mm, namely the wall thickness range of the conduit part is 0.85-1.15 mm; the diameter of the conduit part is 30mm, the appearance tolerance beta of the conduit body of the conduit part is 1.5mm, and the appearance tolerance beta of the flange section of the conduit part is 0.1mm; the thickness lambda of the printing layer is 0.04mm; setting the supporting critical inclination delta as 40 degrees during printing, setting the catheter printing placement mode as shown in fig. 4, setting the interruption threshold value as 30 minutes during printing, setting the middle layer number as 8000 layers, setting the interruption time as 4 hours, and setting the interruption layer position as shown in fig. 5;
Acquiring theoretical fault information according to the theoretical model and the number of interruption layers because the interruption time exceeds an interruption threshold value; the theoretical fault information includes fault shape, size and location;
The difference between the theoretical fault and the actual fault is not too large, so that the powder suction port can be controlled by the theoretical fault information powder suction system to reach the vicinity of the actual fault, and powder in the width range of 0-10 mm of the actual fault and the vicinity of the actual fault can be sucked and then sent into the powder recovery cabin;
After the powder covered on the surface and nearby of the actual fault is removed, the powder is acquired through an industrial box and image information and uploaded to a data processing system, the data system extracts an actual fault picture, a two-dimensional model of a 8000 th layer of a theoretical fault, namely a theoretical model, is called to be compared with the actual fault, and as shown in fig. 6, 7 and 9, the maximum transverse offset of the actual fault relative to the theoretical fault in the +X direction is obtained to be delta L=0.9 mm.
Judging that the wall thickness tolerance alpha=0.15 mm < the maximum transverse offset delta L=0.9 mm < the external tolerance beta=1.5 mm of the catheter part, and if printing is needed, the wall thickness of the 8001 layer of the catheter part is only 0.1mm, and the wall thickness range of the catheter part is not satisfied and is 0.85 mm-1.15 mm; meanwhile, if the correction model of the conduit part is only moved 0.9mm towards the X direction of the theoretical fault, the flange section of the conduit part printed subsequently deviates 0.9mm, and the requirement that the appearance tolerance beta of the flange section of the conduit part is 0.1mm is not met. Therefore, it is necessary to build a correction model and restart printing in accordance with the correction model.
Assuming that the correction layer number of the correction model is M and the single-layer correction amount of each correction layer is Lx, firstly determining that the single-layer correction amount is Lx maximum value of λ×cotδ=0.04×cot40° = 0.04767mm Δl; when the correction positions are the pipe sections of the pipe parts, the shapes of correction layers of the correction models are the same, and the maximum value of the single-layer correction quantity Lx is 0.04767mm, the correction layer number M of the correction models obtains the minimum value delta L/(lambda×cot delta) =0.9/0.04767 =18.88, the correction layer number M is rounded upwards to obtain the minimum value 19, as shown in fig. 7 and 8, only M-1, namely 18 layers are actually printed after restarting printing, and the lateral offset of the 8001 th to 8018 th correction delta L layers after restarting printing and the printing layers of the corresponding theoretical model is smaller than the appearance tolerance beta=1.5 mm, so that the wall thickness tolerance and the appearance tolerance requirements are met when restarting printing according to the correction models.
In order to improve the smoothness between adjacent correction layers of the correction model, the section abrupt change is reduced, as shown in fig. 9 and 10, the adjustment coefficient is set to σ=3, the minimum correction layer number M of the correction model is 3xΔl/(λ×cotδ) =3x19=57, the single-layer offset Lx between adjacent correction layers in the correction model is Δl/m=0.9/57= 0.01579mm Δl, and the actual printing layer is printed in one-to-one correspondence with the first 56 layers of the correction layer printed according to the correction model after restarting printing.
Example 7:
In the embodiment, the AlSi10Mg aluminum alloy thin-wall conical shell shown in fig. 11 is formed by adopting a laser selective melting technology, a theoretical model and technological parameters of the conical shell are obtained, the height of the conical shell is 200mm, the wall thickness of the conical shell is 3mm, the thickness tolerance alpha is +/-0.2 mm, the appearance tolerance beta is 1.5mm, the printing layer thickness lambda is 0.03mm, and the supporting critical inclination delta is set to be 50 degrees during printing, as shown in fig. 10.
The printing process interruption threshold is set to be 30 minutes, printing interruption occurs when the printing is actually performed on the bottom 2000 printing layers, so that the printing interruption layer is the 2000 th layer, the printing interruption time is 8 hours, and theoretical fault information is acquired according to the theoretical model and the interruption layer number because the interruption time exceeds the interruption threshold; the theoretical fault information includes fault shape, size and location;
The difference between the theoretical fault and the actual fault is not too large, so that the powder suction port can be controlled by the theoretical fault information powder suction system to reach the vicinity of the actual fault, and powder in the width range of 0-10 mm of the actual fault and the vicinity of the actual fault can be sucked and then sent into the powder recovery cabin;
After the powder covered on the surface and the vicinity of the actual fault is removed, image information is acquired through an industrial camera and uploaded to a data processing system, the data system extracts an actual fault picture, a two-dimensional model of a theoretical fault, namely a 2000 th layer of a theoretical model, is called to be compared with the actual fault, and the maximum transverse offset of the actual fault relative to the theoretical fault in the-X direction is obtained to be delta L=1 mm. At this time, the thickness tolerance is 0.2mm < the maximum lateral offset < the profile tolerance is 1.5mm, and if printing is restarted directly, the thickness tolerance cannot be satisfied by ±0.2 mm. Therefore, a correction model needs to be built to correct the actual part to fit the theoretical model when printing is restarted.
The correction model is based on an actual fault, the increase of the correction layer number in the correction model is gradually fitted with a theoretical model, and the correction layer number of the correction model is assumed to be M layers, and the maximum single-layer correction quantity Lx=lambda×cotdelta=0.03×cot50 DEG= 0.02517mm of the adjacent correction layers; when the conical housing part is laterally displaced due to printing interruption, the correction inclination angle θ of the correction model is smaller than the support critical inclination angle δ regardless of the minimum correction layer number m=Δl/(λ×cotδ) of the correction model, and the correction layer number m=σ× Δl/(λ×cotδ) =10×1/0.02517 =398.
At this time, the supporting critical inclination angle δ should be reduced within an allowable range, in this embodiment, the supporting critical inclination angle δ is reduced to 45 °, the correction model is modified under the condition of the new supporting critical angle δ=45°, and the single-layer correction amount Lx between each adjacent printing layer in the modified correction model is calculated to have a maximum value lx=λ×cotδ=0.03×cot45° =0.03 mm according to the new supporting critical angle δ. The value of the minimum correction layer number M is recalculated in accordance with this, the adjustment coefficient σ is set to 1.2, and the correction layer number m=σxΔl/(λ×cotδ) =1.2×1/0.03=40 of the correction model. The actual segment layers at 2040 th layer of the theoretical model to 2000 th layer of the actual part are calculated for comparison, and the correction inclination angle θ=32.6° of the correction model at this time is calculated to be smaller than the support critical inclination angle δ=45° as shown in fig. 12 for comparison, as shown in fig. 11. The abrupt change of the cross section among the actual part, the correction model and the theoretical model is larger, the correction layer number M=sigma×DeltaL/(lambda×cotdelta) +i of the correction model is adjusted, M is rounded upwards, the initial value of i is 1, until the measured correction inclination angle theta of the correction model is larger than or equal to the supporting critical inclination angle delta, the correction layer number M=208 of the correction model is calculated, and the correction inclination angle theta= 45.02 DEG of the correction model is shown in fig. 13, so that the condition is met.
Since the M-th layer of the correction model coincides with the theoretical model, the correction model only needs to print 207 correction layers in the printing process. The single-layer correction amount lx=Δl/m=1/208= 0.004808mm between the printing layers in the correction model is recalculated from the 2208 th layer of the theoretical model to the 200 th layer of the actual part. Reconstructing a correction model according to the single-layer correction amount, and comparing 207 correction layers to be printed with the corresponding layers of the theoretical model respectively, so that the transverse correction amount delta L of the correction model is smaller than the appearance tolerance beta=1.5 mm, namely the maximum transverse offset of the correction model and the theoretical model is in a set tolerance range, and restarting printing according to the correction model shown in fig. 13.
Example 8:
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of embodiments 1 to 5.
Example 9:
The present embodiment provides a computer device comprising a memory storing a computer program and a processor implementing the steps of the method of any of embodiments 1 to 5 when the computer program is executed.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification and equivalent variation of the above embodiment according to the technical matter of the present invention falls within the scope of the present invention.
Claims (9)
1. The method for processing the printing interruption fault of the additive manufacturing is characterized by comprising the following specific steps of:
S1: obtaining a theoretical model, an interruption layer number, interruption time, an interruption threshold value, a wall thickness tolerance alpha, a profile tolerance beta, a printing layer thickness lambda and a supporting critical inclination delta;
S2: if the interruption time exceeds the interruption threshold value, acquiring theoretical fault information according to the theoretical model and the interruption layer number;
s3: according to the theoretical fault information, removing powder on the surface of an actual fault;
S4: acquiring actual fault information, comparing the actual fault with the theoretical fault, and acquiring the transverse offset of the actual fault relative to the theoretical fault;
S5: if the maximum transverse offset is less than or equal to the wall thickness tolerance alpha, restarting printing according to a theoretical model based on an actual fault; if the wall thickness tolerance alpha is less than the maximum transverse offset and less than the shape tolerance beta, a correction model with the increased overlap ratio with the theoretical model along with the increase of the printing layer number is established based on the actual fault, printing is restarted according to the correction model, and the part is printed according to the theoretical model after overlapping with the theoretical model; if the maximum transverse offset is larger than the outline tolerance beta, temporarily not executing the operation;
The transverse correction direction of the correction model points to the theoretical fault from the actual fault, the transverse correction of the correction model is delta L, the single-layer correction of adjacent correction layers of the correction model is Lx, the correction layer number of the correction model is M layers, the thickness of each correction layer of the correction model is lambda, and the correction inclination angle of the correction model is theta; in order to ensure that the printing is not supported according to the correction model, the correction inclination angle theta is smaller than or equal to the support critical inclination angle delta, the single-layer correction quantity Lx=lambda×cottheta is smaller than or equal to lambda×cotdelta in the correction model, and the correction layer number M=delta L/(lambda×cottheta) is larger than or equal to delta L/(lambda×cotdelta).
2. An additive manufacturing print interruption fault handling method according to claim 1, wherein: the supporting critical inclination delta=40-50 degrees.
3. An additive manufacturing print interruption fault handling method according to claim 1, wherein: in S5, when the shape and the size of each correction layer of the correction model are the same, the minimum correction layer number m=Δl/(λ×cotδ) of the correction model, where the value of M is rounded up.
4. A method of additive manufacturing print interruption failure handling according to claim 3, wherein: in order to improve the surface smoothness of the part after restarting printing, the minimum correction layer number M=sigma×DeltaL/(lambda×cotdelta) of the correction model is adjusted, wherein sigma is an adjustment coefficient, sigma is more than or equal to 1, and the value of M is rounded upwards.
5. An additive manufacturing print interruption fault handling method according to claim 1, wherein: in S5, when the shape and the size of each correction layer of the correction model are not completely the same, the minimum correction layer number m=σxΔl/(λ×cotδ) of the correction model is adjusted, wherein σ is an adjustment coefficient, σ is greater than or equal to 1, and M is rounded up.
6. An additive manufacturing print interruption fault handling method of claim 5, wherein: and if the measured correction inclination angle theta of the correction model is smaller than the supporting critical inclination angle delta, adjusting the correction layer number M=sigma×delta L/(lambda×cotdelta) +i of the correction model, wherein M is rounded upwards, and the initial value of i is 1 until the measured correction inclination angle theta of the correction model is larger than or equal to the supporting critical inclination angle delta.
7. An additive manufacturing print interruption fault handling method of claim 5, wherein: taking the maximum value of the adjustment coefficient sigma to be 10, and setting the minimum correction layer number of the correction model to be M=10DeltaL/(lambda×cotdelta); at this time, if the correction inclination angle θ of the correction model is smaller than the support critical angle δ, the support critical inclination angle δ is reduced, and the single-layer correction amount lx=λ×cotθ of the new correction model is obtained from the new support critical angle δ.
8. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program, when executed by a processor, implements the steps of an additive manufacturing print interruption failure handling method of any one of claims 1 to 7.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that: the processor, when executing the computer program, implements the steps of a method of additive manufacturing print interruption failure handling according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310432074.1A CN116540955B (en) | 2023-04-21 | 2023-04-21 | Printing interruption fault processing method, medium and equipment for additive manufacturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310432074.1A CN116540955B (en) | 2023-04-21 | 2023-04-21 | Printing interruption fault processing method, medium and equipment for additive manufacturing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116540955A CN116540955A (en) | 2023-08-04 |
| CN116540955B true CN116540955B (en) | 2024-07-12 |
Family
ID=87449781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310432074.1A Active CN116540955B (en) | 2023-04-21 | 2023-04-21 | Printing interruption fault processing method, medium and equipment for additive manufacturing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116540955B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109816633A (en) * | 2018-12-27 | 2019-05-28 | 大族激光科技产业集团股份有限公司 | A kind of defect monitoring method based on 3D printing system, device and terminal device |
| CN114972180A (en) * | 2017-04-13 | 2022-08-30 | 英卓美特公司 | Method for predicting defects in an assembly unit |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020215093A1 (en) * | 2019-04-19 | 2020-10-22 | Nanotronics Imaging, Inc. | Systems, methods, and media for artificial intelligence process control in additive manufacturing |
| CN110508811B (en) * | 2019-09-06 | 2022-03-04 | 汕头市瑞祥模具有限公司 | Quality detection and automatic correction method in material increase and decrease composite manufacturing process |
| CN112828311B (en) * | 2021-01-03 | 2022-05-24 | 苏州星祥益精密制造有限公司 | Metal additive manufacturing online track adjusting method based on real-time three-dimensional detection |
| CN115106539B (en) * | 2021-03-23 | 2023-07-14 | 大族激光科技产业集团股份有限公司 | Material increasing and decreasing integrated control method and system |
| CN113560597A (en) * | 2021-05-31 | 2021-10-29 | 东方电气集团东方电机有限公司 | Composite manufacturing method for increasing and decreasing materials of rotating wheel of water turbine |
| CN113610266B (en) * | 2021-06-25 | 2023-07-25 | 东风本田发动机有限公司 | Method and device for predicting failure of automobile part, computer equipment and storage medium |
| CN113828797A (en) * | 2021-10-31 | 2021-12-24 | 南京中科煜宸激光技术有限公司 | Laser additive manufacturing process based on powder feeding speed optimization |
| CN115169226A (en) * | 2022-07-01 | 2022-10-11 | 南京航空航天大学 | Arc additive manufacturing layered slicing method based on data accumulation |
| CN115815621A (en) * | 2022-12-15 | 2023-03-21 | 鑫精合激光科技发展（北京）有限公司 | Metal component manufacturing method and device and storage medium |
-
2023
- 2023-04-21 CN CN202310432074.1A patent/CN116540955B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114972180A (en) * | 2017-04-13 | 2022-08-30 | 英卓美特公司 | Method for predicting defects in an assembly unit |
| CN109816633A (en) * | 2018-12-27 | 2019-05-28 | 大族激光科技产业集团股份有限公司 | A kind of defect monitoring method based on 3D printing system, device and terminal device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116540955A (en) | 2023-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3511095A1 (en) | Temperature control system for additive manufacturing and method for same | |
| US20130092340A1 (en) | Process and Refractory Metal Core for Creating Varying Thickness Microcircuits for Turbine Engine Components | |
| CN110695356B (en) | Integrated projectile body manufacturing method based on powder feeding type additive manufacturing method | |
| CN116540955B (en) | Printing interruption fault processing method, medium and equipment for additive manufacturing | |
| WO2011026065A1 (en) | Method of making ceramic bodies having reduced shape variability | |
| EP3560618A1 (en) | Metal plate forming method, intermediate shape designing method, metal plate forming mold, computer program, and recording medium | |
| CN112387947B (en) | Preparation method of cold forging steel | |
| US20220072646A1 (en) | Method for setting excess thickness, device for setting excess thickness, method for producing shaped object, and program | |
| CN112916878A (en) | Additive manufacturing ring-shaped part shape righting method | |
| US20160333694A1 (en) | Manufacture of metal core by using rapid prototyping method and method for manufacturing precision parts through hot isostatic pressing using same, and turbine blisk for driving liquid rocket turbo pump using same | |
| CN107552788B (en) | False sintering method for selective laser melting metal additive manufacturing | |
| CN113981434B (en) | Device and method for adaptively regulating and controlling laser cladding forming angle of circular inclined thin-wall part | |
| CN116507025A (en) | Circuit board processing method, system, expansion and contraction control forming machine and storage medium | |
| JP2765798B2 (en) | Robot control method | |
| CN111496252A (en) | S L M printing method and system capable of controlling deformation of thin-wall structure | |
| US10618105B2 (en) | Casting device and casting method | |
| JP5105090B2 (en) | Casting internal defect inspection support apparatus and method | |
| CN109261756B (en) | Titanium alloy revolving body component and shape correcting method and forming method thereof | |
| CN115107279A (en) | Method and system for predicting pre-exposure waiting time of pull-up type surface forming 3D printing | |
| JPH1080726A (en) | Method for straightening metal cylindrical part | |
| JP5928186B2 (en) | Tapered plate rolling method, taper plate manufacturing method | |
| JP2009012058A (en) | Method and apparatus for bending metallic sheet by linear heating | |
| CN114769615B (en) | Metal 3D printing method without supporting structure | |
| CN110653403A (en) | Method for rapidly predicting cutting area of each tooth during fillet milling | |
| CN112975483B (en) | Method for processing fork-shaped part |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |