CN109334009A - A kind of powdering control method, equipment and readable storage medium storing program for executing - Google Patents
A kind of powdering control method, equipment and readable storage medium storing program for executing Download PDFInfo
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- CN109334009A CN109334009A CN201811119995.8A CN201811119995A CN109334009A CN 109334009 A CN109334009 A CN 109334009A CN 201811119995 A CN201811119995 A CN 201811119995A CN 109334009 A CN109334009 A CN 109334009A
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- 238000000227 grinding Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005245 sintering Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims abstract description 7
- 230000002159 abnormal effect Effects 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 16
- 238000004590 computer program Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 5
- 239000000428 dust Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000110 selective laser sintering Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
Classifications
-
- 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
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- 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
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
This application involves a kind of powdering control method, equipment and readable storage medium storing program for executing, an at least intermediate image is calculated by the way that at least image stored in current tomographic image and database is carried out difference, and obtains result images after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to every intermediate image；So that one aspect of the present invention solve dust in sintering process fall in camera lens, scraper, cavity surrounding, on light source, problem of the caused optical environment variation to cause judgement inaccurate；On the other hand it efficiently solves the problems, such as to determine caused by different materials optics reflectance is inconsistent inaccurate.Therefore, powdering control method, equipment and readable storage medium storing program for executing of the invention are applicable not only to the sintering of homogenous material, are also applied for multiple material mixed sintering, and present invention detection is more acurrate, detection method is simpler.
Description
Technical field
This application involves increases material manufacturing technology field, more particularly to a kind of powdering control method, equipment and readable deposit
Storage media.
Background technique
Increases material manufacturing technology is one, and there is Digitized manufacturing, highly flexible and adaptability, direct CAD model to drive, is fast
Speed, the advanced manufacturing technology for the distinguishing features such as material type is rich and varied, since it is not limited by part shape complexity,
Any moulds of industrial equipment are not needed, therefore application range is very wide.Selective laser sintering (Selective Laser
Sintering, abbreviation SLS) and selective laser melting (Selective Laser Melting, abbreviation SLM) be to send out in recent years
Open up increases material manufacturing technology the most rapid.
In increases material manufacturing technology, a workpiece is being printed, the thousands of up to ten thousand powderings movements of repetition is being typically necessary, beats
Printing apparatus will appear some accidents once in a while among this, cause such as to be laid with powder missing, and powder collapses, and be sintered workpiece warpage,
Support collapses the problems such as waiting.It is also likely to be product design problem itself, for example supported design is defective leads to workpiece warpage.More than
These problems are in thousands of times tens of thousands of times sintering processes, as long as occurring once, if do not handled, will lead to entire
The sintering of workpiece fails.
In order to solve the above-mentioned drawback of powdering quality bring, the prior art also proposed some powder quality detection methods,
This method generally pass through detection powder overall gray value it is whether consistent or its compared with ideal powder with the presence or absence of poor
Different, although this method can solve above-mentioned technical problem, but its based on premise be typically all that device hardware does not have any problems,
But in specifically workpiece print procedure, hardware may have some variations, such as the camera lens in sintering process on camera
More and more powder can be accumulated and influence captured image change, the powder accumulated on light source is more and more and leads to light source
It is changed stepwise, it is reflective etc..Above hardware problem is to will lead to the erroneous judgement of powder quality testing, to affect detection
Accuracy.
Summary of the invention
For above-mentioned technical problem of the existing technology, the present invention provides a kind of more acurrate and detection methods of detection
Simpler powdering control method, equipment and readable storage medium storing program for executing.
To achieve the above object, this application provides a kind of powdering control methods, comprising the following steps:
When receiving powdering detection instruction, the current tomographic image of working region is obtained by optical camera；
At least image stored in current tomographic image and database is subjected to difference, an at least intermediate image is calculated,
Every intermediate image show every image of current tomographic image and storage carry out all normal pixels that difference is calculated and
Abnormal pixel；
Result is obtained after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to every intermediate image
Image；
The quantity of all abnormal pixels in each result images is counted, and chooses maximum quantitative value and is worth as a result；
Powdering quality is judged according to end value, and is judged whether to need powdering again according to powdering quality.
As a further preferred embodiment of the present invention, when Powder spreader is from a side of working region to other side powdering, and spread
Powder to working region the other side when, send powdering detection instruction.
As a further preferred embodiment of the present invention, all normal pixels and abnormal pixel in the intermediate image pass through
It is shown after binary conversion treatment.
As a further preferred embodiment of the present invention, powdering quality is judged according to end value, and judge according to powdering quality
Powdering whether is needed again to specifically include:
When end value is less than or equal to the first preset value, judge that powdering is normal；
When end value is greater than the first preset value and when less than the second preset value, judge that powdering quality is not good enough；
When end value is greater than or equal to the second preset value, powdering exception is judged, again powdering.
As a further preferred embodiment of the present invention, when judging that powdering is normal, and the image number stored in database is not
When reaching maximum value, which is saved into database, and as last image stored in database；Or
Person
When the image number for judging that powdering is normal, and storing in database reaches maximum value, by the current layer image save to
In database, and as last image stored in database, while removing first image stored in database.
As a further preferred embodiment of the present invention, when powdering quality is not good enough or powdering is abnormal, the current layer figure is deleted
Picture.
It is abnormal when judging powdering as a further preferred embodiment of the present invention, and powdering continuously reaches setting number extremely
When, stop workpiece sintering, and start alarm.
It will be current when the image stored in the database is several as a further preferred embodiment of the present invention
Several images progress difference stored in tomographic image and database is calculated several intermediate images and specifically includes:
Each pixel by current tomographic image respectively with same position in each image storing in database does subtraction
Operation；
And the absolute value for the value for obtaining subtraction is as end value；
It is then labeled as abnormal pixel when end value is greater than difference parameter, end value is then marked less than or equal to difference parameter and is positive
Normal pixel.
The present invention also provides a kind of powderings to control equipment, including memory, processor and storage are on a memory and can
The computer program run on a processor, the processor are realized as described in any of the above-described when executing the computer program
The step of method.
The present invention also provides a kind of readable storage medium storing program for executing, are stored with computer program, and the computer program of storage is located
It manages and is realized when device executes as described in any of the above-described the step of powdering control method.
Powdering control method, equipment and readable storage medium storing program for executing of the invention, by will be in current tomographic image and database
An at least image for storage carries out difference and an at least intermediate image is calculated, and corrodes to every intermediate image
Result images are obtained after handling the normal sintering edge to remove noise and workpiece to be printed；So that one aspect of the present invention solves
In sintering process dust fall in camera lens, scraper, cavity surrounding, on light source, caused optical environment variation is to cause judgement not
Quasi- problem；On the other hand it efficiently solves the problems, such as to determine caused by different materials optics reflectance is inconsistent inaccurate.Cause
This, the present invention is applicable not only to the sintering of homogenous material, is also applied for multiple material mixed sintering, and present invention detection is more quasi-
Really, detection method is simpler.
Detailed description of the invention
Fig. 1 is the method flow diagram of powdering control method in one embodiment of the invention；
Fig. 2 is the normal powder state diagram of powdering in an embodiment
Fig. 3 is the powder state diagram of powdering exception in an embodiment；
Fig. 4 is the intermediate image in an embodiment；
Fig. 5 is the result images in an embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
As shown in Figure 1, a kind of powdering control method provided by the present application, comprising the following steps:
Step S1, when receiving powdering detection instruction, the current tomographic image of working region is obtained by optical camera；
In step S1, in the prior art, usually equal current layers powdering sends powdering detection instruction when completing, and the present invention can also
To use which of the prior art, but as a preferred embodiment of the invention, it can not be fully finished in powdering, that is, work as Powder spreader
From a side of working region to other side powdering, and powdering to working region the other side when, send powdering detection instruction, specifically
Ground can send powdering detection instruction from PLC to host computer, can save Powder spreader in this way and continue to move ahead from the other side of working region
The other side this period for reaching powder feeding cylinder and being back to working region, and then further improve working efficiency.
It is executed since certain layer in addition, the present embodiment can according to need, for instance, it is preferred that due to starting several layers of powderings
Less stable can generally be executed since the tenth layer, i.e., send powdering detection instruction from PLC to host computer, naturally it is also possible to root
Stop executing according to needs.
Specifically, the specific setting position of the optical camera the present invention with no restrictions, according to actual needs its
Can be using one or more, such as when work area is larger, an optical camera can not shoot all working region
When image, then it can choose multiple optical cameras.
Preferably, the current tomographic image obtained in step S1 can carry out gray processing processing, in order to subsequent analysis.
Step S2, at least image stored in current tomographic image and database is subjected to difference and is calculated at least one
Intermediate image, every intermediate image show every image of current tomographic image and storage carry out difference be calculated it is all
Normal pixel and abnormal pixel；
Preferably, all normal pixels in the intermediate image and abnormal pixel after binary conversion treatment by being shown, i.e.,
Gray scale 255 is set by abnormal elements, normal element is set as gray scale 0.
In step S2, first image stored in the database is the paving stored by designer according to experiment
The normal image of silty amount, the image stored thereafter are that is executed and be stored by the present embodiment meet the image of condition, for example,
When the image number for judging that powdering is normal, and storing in database is not up to maximum value (can be set as 10), by the current layer figure
As saving into database, and as last image stored in database；Or works as and judge that powdering is normal, and database
When the image number of middle storage reaches maximum value, which is saved into database, and as being stored in database
Last image, while removing first image stored in database.
Specifically, in step S2, when the image stored in the database is several, by current tomographic image and number
Several intermediate images are calculated according to several images progress difference stored in library to specifically include:
Each pixel by current tomographic image respectively with same position in each image storing in database does subtraction
Operation；
And the absolute value for the value for obtaining subtraction is as end value；
It is then labeled as abnormal pixel when end value is greater than difference parameter, end value is then marked less than or equal to difference parameter and is positive
Normal pixel.The difference parameter can determine specific value according to many experiments by designer.
Step S3, corrosion treatment is carried out to remove the normal sintering edge of noise and workpiece to be printed to every intermediate image
After obtain result images；
Specifically, parameter used by corrosion treatment can be according to agglomerated material, device hardware and workpiece shapes in step S3
It the odd numbers rectangle such as is configured, such as 3*3,5*5 or 7*7 can be used to be corroded.Due to the concrete mode category of corrosion treatment
In the state of the art, therefore, it is not set forth in detail in the present invention.
The intermediate image of an embodiment is shown in Fig. 4, by taking the image as an example, by carrying out corrosion treatment to it to remove
Result images are obtained behind the normal sintering edge of noise and workpiece to be printed, as shown in Figure 5.Noise in step S3 is mainly
Refer to image change caused by hardware change, as in sintering process dust fall in camera lens, scraper, cavity surrounding, on light source, it is caused
Optical environment variation；Different materials optics reflectance is inconsistent etc., by excluding difference caused by these normal and hardware,
The final result image can judge whether powdering is abnormal.
Step S4, the quantity of all abnormal pixels in each result images is counted, and chooses maximum quantitative value conduct
End value；
In step S4, the quantity for the abnormal pixel that every image includes in all result images is counted, and chooses abnormal pixel
The maximum quantitative value of quantity is worth as a result, and by taking ten result images as an example, counting gray value in ten result images respectively is
255 pixel (i.e. abnormal pixel), obtains ten end values, takes maximum end value.
Step S5, powdering quality is judged according to end value, and is judged whether to need powdering again according to powdering quality.
In the step, it can determine that powdering is abnormal or normal two kinds of situations, it is preferable that according to powdering quality in order to more accurately
Determine powdering quality and record powdering quality state, the step may particularly include in detail:
When end value is less than or equal to the first preset value, judge that powdering is normal (as shown in Figure 2)；When judging that powdering is normal, and
When the image number stored in database is not up to maximum value, which is saved into database, and as data
Last image stored in library；Or
When the image number for judging that powdering is normal, and storing in database reaches maximum value, by the current layer image save to
In database, and as last image stored in database, while removing first image stored in database.
When end value is greater than the first preset value and when less than the second preset value, judge that powdering quality is not good enough；Work as powdering quality
When not good enough, the current layer image is deleted, i.e., not saving this tomographic image is contrast images, or is carried out using ten original tomographic images
Comparison, then proceedes to be sintered；
When end value is greater than or equal to the second preset value, judge that powdering is abnormal (as shown in Figure 3), again powdering.And work as powdering
When abnormal, the current layer image is deleted, similarly, not saving this tomographic image is contrast images, or uses ten original tomographic images
It compares.
It is understood that first preset value and the second preset value are set as the case may be by designer, and
The first preset value need to be met less than the second preset value.
Preferably, in order to save time, working efficiency is improved, it is abnormal when judging powdering, and powdering is continuously reached extremely and is set
When determining number, stops workpiece sintering, and start alarm, to remind the equipment fault, need manual maintenance.
The present invention also provides a kind of powderings to control equipment, including memory, processor and storage are on a memory and can
The computer program run on a processor, the processor realize such as above-mentioned any embodiment when executing the computer program
The step of the method.
The present invention also provides a kind of readable storage medium storing program for executing, are stored with computer program, and the computer program of storage is located
It manages and is realized when device executes as described in above-mentioned any embodiment the step of powdering control method.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of powdering control method, which comprises the following steps:
When receiving powdering detection instruction, the current tomographic image of working region is obtained by optical camera；
At least image stored in current tomographic image and database is subjected to difference, an at least intermediate image is calculated,
Every intermediate image show every image of current tomographic image and storage carry out all normal pixels that difference is calculated and
Abnormal pixel；
Result is obtained after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to every intermediate image
Image；
The quantity of all abnormal pixels in each result images is counted, and chooses maximum quantitative value and is worth as a result；
Powdering quality is judged according to end value, and is judged whether to need powdering again according to powdering quality.
2. powdering control method according to claim 1, which is characterized in that when Powder spreader is from a side of working region to another
Side powdering, and powdering to working region the other side when, send powdering detection instruction.
3. powdering control method according to claim 2, which is characterized in that all normal pixels in the intermediate image
With abnormal pixel by being shown after binary conversion treatment.
4. powdering control method according to any one of claims 1 to 3, which is characterized in that judge powdering according to end value
Quality, and judged whether that powdering is needed again to specifically include according to powdering quality:
When end value is less than or equal to the first preset value, judge that powdering is normal；
When end value is greater than the first preset value and when less than the second preset value, judge that powdering quality is not good enough；
When end value is greater than or equal to the second preset value, powdering exception is judged, again powdering.
5. powdering control method according to claim 4, which is characterized in that when judging that powdering is normal, and deposited in database
When the image number of storage is not up to maximum value, which is saved into database, and as being stored in database
Last image；Or
When the image number for judging that powdering is normal, and storing in database reaches maximum value, by the current layer image save to
In database, and as last image stored in database, while removing first image stored in database.
6. powdering control method according to claim 5, which is characterized in that when powdering quality is not good enough or powdering is abnormal,
Delete the current layer image.
7. powdering control method according to claim 6, which is characterized in that it is abnormal when judging powdering, and powdering connects extremely
It is continuous when reaching setting number, stop workpiece sintering, and start alarm.
8. powdering control method according to claim 7, which is characterized in that if when the image stored in the database is
At dry, several images stored in current tomographic image and database is subjected to difference, several intermediate images tool is calculated
Body includes:
Each pixel by current tomographic image respectively with same position in each image storing in database does subtraction
Operation；
And the absolute value for the value for obtaining subtraction is as end value；
It is then labeled as abnormal pixel when end value is greater than difference parameter, end value is then marked less than or equal to difference parameter and is positive
Normal pixel.
9. a kind of powdering controls equipment, can be run on a memory and on a processor including memory, processor and storage
Computer program, which is characterized in that the processor is realized when executing the computer program such as any one of claim 1-8 institute
The step of stating method.
10. a kind of readable storage medium storing program for executing, is stored with computer program, which is characterized in that the computer program of storage is by processor
It is realized when execution as described in any one of claim 1-8 the step of powdering control method.
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| CN201811119995.8A CN109334009B (en) | 2018-09-25 | 2018-09-25 | Powder paving control method and device and readable storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811119995.8A CN109334009B (en) | 2018-09-25 | 2018-09-25 | Powder paving control method and device and readable storage medium |
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| CN109334009B CN109334009B (en) | 2021-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900707A (en) * | 2019-03-20 | 2019-06-18 | 湖南华曙高科技有限责任公司 | A kind of powdering quality detection method, equipment and readable storage medium storing program for executing |
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| CN106290375A (en) * | 2016-07-14 | 2017-01-04 | 北京航信增材科技有限公司 | Non-contact online defect automatic detection system based on laser selective sintering technology |
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2018
- 2018-09-25 CN CN201811119995.8A patent/CN109334009B/en active Active
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| CN106290375A (en) * | 2016-07-14 | 2017-01-04 | 北京航信增材科技有限公司 | Non-contact online defect automatic detection system based on laser selective sintering technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109900707A (en) * | 2019-03-20 | 2019-06-18 | 湖南华曙高科技有限责任公司 | A kind of powdering quality detection method, equipment and readable storage medium storing program for executing |
| CN109900707B (en) * | 2019-03-20 | 2021-07-02 | 湖南华曙高科技有限责任公司 | Powder paving quality detection method and device and readable storage medium |
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| CN109334009B (en) | 2021-03-19 |
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Address after: No. 181, Linyu Road, national high tech Industrial Development Zone, Changsha City, Hunan Province, 410205 Patentee after: Hunan Huashu High Tech Co.,Ltd. Address before: No. 181, Linyu Road, national high tech Industrial Development Zone, Changsha City, Hunan Province, 410205 Patentee before: HUNAN FARSOON HIGH-TECH Co.,Ltd. |
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