CN109900707A - A kind of powdering quality detection method, equipment and readable storage medium storing program for executing - Google Patents
A kind of powdering quality detection method, equipment and readable storage medium storing program for executing Download PDFInfo
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- CN109900707A CN109900707A CN201910213686.5A CN201910213686A CN109900707A CN 109900707 A CN109900707 A CN 109900707A CN 201910213686 A CN201910213686 A CN 201910213686A CN 109900707 A CN109900707 A CN 109900707A
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Abstract
A kind of powdering quality detection method, equipment and readable storage medium storing program for executing, by arranging the pixel in current layer image by array；Successively line by line and/or pixel is handled according to preset direction to obtain one or two intermediate images by column from the side of current tomographic image, intermediate image includes all normal pixels and abnormal pixel；Result images are obtained after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to intermediate image；The area at least one region that abnormal pixel is formed in statistical result image, and the area value for choosing the maximum region of area is worth as a result；Powdering quality is judged according to end value, so that the present invention solves in the prior art, it is smaller for each layer of increments of change, the larger quality problems of accumulation method can not detect quality problems before, so as to cause powder quality testing erroneous judgement the technical issues of, therefore, 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 quality detection method, equipment and can
Read storage medium.
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, may result in whole
The sintering of a workpiece fails.
In order to solve the above-mentioned drawback of powdering quality bring, although the prior art proposes some powder quality testing sides
Method, this method is generally by the way that current tomographic image and a upper tomographic image or storage image to be compared, although this method can be with
The powdering quality of powder is detected, but smaller for each layer of increments of change, the powdering quality problem of accumulation is biggish to ask
Topic possibly can not detect powdering quality problem, to then result in powder matter according to powder quality determining method before
The erroneous judgement for measuring detection, that is, affect the accuracy of detection.
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 quality detection method, equipment and readable storage medium storing program for executing.
To achieve the above object, this application provides a kind of powdering quality detection methods, comprising the following steps:
When receiving powdering quality detection instruction, the current tomographic image of working region is obtained by optical camera；
Pixel in current layer image is arranged by array；
From the side of current tomographic image successively line by line and/or by column according to preset direction to pixel handled to obtain one or
Two intermediate images, the intermediate image include all normal pixels and abnormal pixel, and all normal pixels and abnormal pixel
By being shown after binary conversion treatment；
Result images are obtained after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to intermediate image；
The area at least one region that abnormal pixel is formed in statistical result image, and choose the area in the maximum region of area
Value is worth as a result；
Powdering quality is judged according to end value.
As a further preferred embodiment of the present invention, pixel is handled in the following ways:
Since first pixel of every a line or each column, N number of pixel deposit storage unit in the row or the column is obtained；
Since the N+1 pixel, by the average value of each pixel and all pixels point stored in the storage unit
It is compared；
When the difference of the average value of all pixels point stored in some pixel and storage unit is more than allowed band, by this
Pixel is labeled as abnormal pixel, otherwise, which is labeled as normal pixel, and the normal pixel is saved to storage list
In member, and as the last one pixel stored in storage unit, while removing first pixel stored in storage unit
Point.
As a further preferred embodiment of the present invention, when from the side of current tomographic image successively line by line and by column according to default
It further include following methods when direction is handled to obtain two result images to pixel；
Two result images are subjected to expansion process respectively, and two result images after expansion process are subjected to synthesis and are handled
Image, described be synthesized refer to the abnormal pixel of removal non-overlap to the new images arrived as a result.
As a further preferred embodiment of the present invention, judge that powdering quality specifically includes according to end value:
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.
As a further preferred embodiment of the present invention, the method also includes:
When powdering exception, powdering again is reminded.
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.
As a further preferred embodiment of the present invention, the preset direction be from top to bottom, from top to bottom, from left to right or
From right to left.
As a further preferred embodiment of the present invention, the N is 10-20.
The present invention also provides a kind of powdering quality detection devices, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, which is characterized in that the processor is realized when executing the computer program
As described in any of the above-described the step of powdering quality detection 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 quality detection method.
Powdering quality detection method, equipment and readable storage medium storing program for executing of the invention, by will be in current layer image
Pixel is arranged by array；Successively pixel is carried out according to preset direction line by line and/or by column from the side of current tomographic image
Processing obtains one or two intermediate images, and the intermediate image includes all normal pixels and abnormal pixel, and all normal
Pixel and abnormal pixel after binary conversion treatment by being shown；Corrosion treatment is carried out to remove noise and wait beat to intermediate image
Result images are obtained after printing the normal sintering edge of workpiece；At least one region that abnormal pixel is formed in statistical result image
Area, and the area value for choosing the maximum region of area is worth as a result；Powdering quality is judged according to end value, so that of the invention
On the one hand it solves in the prior art, smaller for each layer of increments of change, the larger quality problems of accumulation can not adopt
Detect quality problems with powder quality determining method before, so as to cause powder quality testing erroneous judgement the technical issues of,
Therefore, present invention detection is more acurrate, detection method is simpler, and on the other hand, the present invention is only needed at current tomographic image
Reason does not need to store a large amount of other tomographic images, so that device memory be greatly saved.
Detailed description of the invention
Fig. 1 is the method flow diagram of embodiment middle berth silty quantity measuring method provided by the invention；
Fig. 2 is the method flow diagram of another embodiment middle berth silty quantity measuring method provided by the invention.
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 quality detection method provided by the present application, comprising the following steps:
Step 11, when receiving powdering quality detection instruction, pass through optical camera obtain working region current tomographic image；
In specific implementation, usually equal current layers powdering sends powdering detection instruction when completing, and the present invention can also use existing
Which of technology, but as a preferred embodiment of the invention, can not be fully finished in powdering, i.e., when Powder spreader is from working region
A side to other side powdering, and powdering to working region the other side when, send powdering detection instruction, specifically can be by PLC
Powdering detection instruction is sent to host computer, Powder spreader can be saved in this way from the other side of working region and continue the arrival powder feeding cylinder that moves ahead
And it is back to other side this period of working region, and then further improve working efficiency.In addition, should be noted herein
Be that the sending time of powdering detection instruction determines according to the design needs, for example, its can every layer of transmission, can also every several layers of transmissions, or
Person just sends when needing to detect, herein with no restrictions.
The specific setting position of the optical camera the present invention with no restrictions, it can also be used according to actual needs
One or more, such as when work area is larger, and an optical camera can not shoot all working area image, then
It can choose multiple optical cameras.
Step 12 is arranged the pixel in current layer image by array；Namely by the pixel of current tomographic image
In several rows and several column distributions, as it can be the pixel of 1920*1080.
Step 13 successively handle to pixel according to preset direction line by line or by column from the side of current tomographic image
To an intermediate image, the intermediate image includes all normal pixels and abnormal pixel, and all normal pixels and extraordinary image
Element after binary conversion treatment by being shown；For example, setting gray scale 255 for abnormal elements, normal element is set as gray scale 0；
The preset direction is from top to bottom, from top to bottom, from left to right or from right to left.It specifically, can be from current tomographic image
Side start, an intermediate image is finally obtained after from left to right successively handling by column pixel, naturally it is also possible to
Since the side of current tomographic image, a middle graph is finally obtained after successively handling line by line pixel from top to bottom
Picture, other specific implementations are not done herein to be introduced one by one.
In the step 13, following manner can be used, pixel is handled:
Step 131, since first pixel of every a line or each column, N number of pixel deposit in the row or the column is obtained
Storage unit；The N can be according to design requirement reasonable set, it is preferable that it can be 10-20, can also select other tools certainly
Body numerical value.
Step 132, since the N+1 pixel, by each pixel and all pictures stored in the storage unit
The average value of vegetarian refreshments is compared；
Step 133, when the difference of the average value of all pixels point stored in some pixel and storage unit is more than to allow model
When enclosing, which is labeled as abnormal pixel, otherwise, which is labeled as normal pixel, and the normal pixel is protected
It deposits into storage unit, and as the last one pixel stored in storage unit, while removing and being stored in storage unit
First pixel, the data that can be stored in this way to data update storage unit, further increase the accuracy of detection.
Allowed band in the step 133 can specifically be set by designer according to the light conditions of equipment, such as it can
Be ± 5%, e.g., when average value is 100, when the value of some pixel is 96 or 102, due to itself and mean difference ±
In 5%, i.e., within the allowable range, so the pixel is labeled as normal pixel.
Step 14 obtains after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to intermediate image
To result images；
Specifically, parameter used by corrosion treatment can be according to agglomerated material, device hardware and workpiece shapes in the step 14
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 area at least one region that abnormal pixel is formed in step 15, statistical result image, and choose area maximum
The area value in region be worth as a result；
Step 16 judges powdering quality according to end value.
In the step 16, judge that powdering quality specifically includes according to end value:
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.
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.Certainly, the above is only a kind of embodiments for judging powdering quality, specific
In implementation, can also only obtain two kinds as a result, normal powdering or abnormal powdering, are not specifically described it at this.
As a preferred embodiment of the invention, the method also includes: when powdering exception, remind powdering again.
As a further preferred embodiment of the present invention, in order to save time, working efficiency is improved, when judge that powdering is abnormal,
And powdering is continuously reached extremely when setting number, is stopped workpiece sintering, and start alarm, to remind the equipment fault, is needed people
Work maintenance.
As shown in Fig. 2, the present invention also provides the method flow diagram of another embodiment middle berth silty quantity measuring method, such as 2
It is shown, the embodiment the following steps are included:
Step 21, when receiving powdering quality detection instruction, pass through optical camera obtain working region current tomographic image；
Step 22 is arranged the pixel in current layer image by array；
Step 23 successively line by line and handles pixel according to preset direction to obtain two by column from the side of current tomographic image
Intermediate image is opened, the intermediate image includes all normal pixels and abnormal pixel, and all normal pixels and abnormal pixel are logical
It is shown after crossing binary conversion treatment；
In the step 23, specifically, from left to right successively pixel can be clicked through by column first since the side of current tomographic image
An intermediate image is finally obtained after row processing, then since the side of current tomographic image, from top to bottom successively line by line to pixel
Point finally obtains another intermediate image after being handled；Or since the side of current tomographic image, from top to bottom successively by
Row finally obtains an intermediate image after handling pixel, then since the side of current tomographic image, from left to right according to
It is secondary pixel is handled by column after finally obtain another intermediate image；Herein it should be noted that, can also be from current layer
The not ipsilateral of image starts to obtain two intermediate images respectively.
Step 24 carries out corrosion treatment respectively to two intermediate images to remove the normal sintering of noise and workpiece to be printed
Two final images are obtained behind edge；
Two final images are carried out expansion process respectively, and two final images after expansion process are closed by step 25
Image, described be synthesized refer to the abnormal pixel of removal non-overlap to the new images obtained at processing as a result.
In the step 25, expansion process is the dual operations of corrosion, and effect is point, line or fritter that spacing is minimum
Region connects into one piece of biggish region, as a result can be bigger than original area summation, since it belongs to the existing of field of image processing
Therefore technology is in the present invention not set forth in detail this.In addition, the step 25 obtains two images after synthesis is handled
To a new images, primarily to the fluorescent tube of optical system is avoided to irradiate bring error, that is, the exception for causing processing to obtain
Therefore the result of pixel and normal pixel inaccuracy by removing the abnormal pixel of non-overlap, then can be further reduced error and deposit
?.
The area at least one region that abnormal pixel is formed in step 26, statistical result image, and choose area maximum
The area value in region be worth as a result；
Step 27 judges powdering quality according to end value.
The embodiment and a upper embodiment, other steps are essentially identical, have been only in that step 25 more, and step 23 and upper
The step 13 of one embodiment is different, which further improves the accuracy rate of detection relative to a upper embodiment.
The present invention also provides a kind of powdering quality detection devices, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, which is characterized in that the processor is realized when executing the computer program
As described in above-mentioned any embodiment the step of powdering quality detection 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 quality detection 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 quality detection method, which comprises the following steps:
When receiving powdering quality detection instruction, the current tomographic image of working region is obtained by optical camera；
Pixel in current layer image is arranged by array；
From the side of current tomographic image successively line by line and/or by column according to preset direction to pixel handled to obtain one or
Two intermediate images, the intermediate image include all normal pixels and abnormal pixel, and all normal pixels and abnormal pixel
By being shown after binary conversion treatment；
Result images are obtained after carrying out normal sintering edge of the corrosion treatment to remove noise and workpiece to be printed to intermediate image；
The area at least one region that abnormal pixel is formed in statistical result image, and choose the area in the maximum region of area
Value is worth as a result；
Powdering quality is judged according to end value.
2. powdering quality detection method according to claim 1, which is characterized in that carried out in the following ways to pixel
Processing:
Since first pixel of every a line or each column, N number of pixel deposit storage unit in the row or the column is obtained；
Since the N+1 pixel, by the average value of each pixel and all pixels point stored in the storage unit
It is compared；
When the difference of the average value of all pixels point stored in some pixel and storage unit is more than allowed band, by this
Pixel is labeled as abnormal pixel, otherwise, which is labeled as normal pixel, and the normal pixel is saved to storage list
In member, and as the last one pixel stored in storage unit, while removing first pixel stored in storage unit
Point.
3. powdering quality detection method according to claim 2, which is characterized in that when from the side of current tomographic image successively
It further include following methods when being handled to obtain two result images to pixel according to preset direction line by line and by column；
Two result images are subjected to expansion process respectively, and two result images after expansion process are subjected to synthesis and are handled
Image, described be synthesized refer to the abnormal pixel of removal non-overlap to the new images arrived as a result.
4. powdering quality detection method according to any one of claims 1 to 3, which is characterized in that judged according to end value
Powdering quality specifically includes:
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.
5. powdering quality detection method according to claim 4, which is characterized in that the method also includes:
When powdering exception, powdering again is reminded.
6. powdering quality detection method according to claim 5, which is characterized in that it is abnormal when judging powdering, and powdering is different
When often continuously reaching setting number, stop workpiece sintering, and start alarm.
7. powdering quality detection method according to claim 6, which is characterized in that the preset direction be from top to bottom,
From top to bottom, from left to right or from right to left.
8. powdering quality detection method according to claim 7, which is characterized in that the N is 10-20.
9. a kind of powdering quality detection device, including memory, processor and storage can transport on a memory and on a processor
Capable computer program, which is characterized in that the processor is realized when executing the computer program as claim 1-8 is any
The step of item powdering quality detection 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 quality detection method.
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