CN105120182B - Face is molded increasing material manufacturing systematic part supporting construction exposure compensation and device - Google Patents
Face is molded increasing material manufacturing systematic part supporting construction exposure compensation and device Download PDFInfo
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- CN105120182B CN105120182B CN201510603781.8A CN201510603781A CN105120182B CN 105120182 B CN105120182 B CN 105120182B CN 201510603781 A CN201510603781 A CN 201510603781A CN 105120182 B CN105120182 B CN 105120182B
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Abstract
The invention discloses face shaping increasing material manufacturing systematic part supporting construction exposure compensation and device, including：Slicing treatment is carried out to the digital geometry model of the part, obtains the physical profiles of each layer of part and the mask image corresponding with physical profiles；Mask image corresponding to every layer of part is read in successively and identifies whole profiles in every layer mask image；The elemental area of each profile is calculated, when the elemental area of profile is equal to given area threshold, is exposed compensation, prolonging exposure time；When the elemental area of profile is less than given area threshold, the information of the profile is individually stored in another mask image, is exposed compensation.The support exposure compensating mode that this method uses can reduce the waste of resin material in the smooth shaping for realizing smaller support diameter；The intensity of tiny characteristics can be obviously improved by increasing the time for exposure of tiny characteristics simultaneously, avoided destruction of the pull-up motion to tiny characteristics between layers, improved part success rate.
Description
Technical field
The present invention relates to increases material manufacturing technology field, and in particular to a kind of face forming part supporting construction exposure compensation
And device.
Background technology
Increasing material manufacturing is to be integrated with the emerging manufacture method of the multiple technologies such as numerical DC speed, advanced material, information network, with
The technology mode such as the machining in conventional fabrication processes, forging is different, and increasing material manufacturing is manufactured by increasing the method for material
Go out physical item.Have broad application prospects in numerous areas, such as industrial products conceptual design, rapid mold manufacture, medical science should
With etc..Face forming manufacture technique is a kind of increasing material manufacturing technique based on projection, is had in shaping speed, precision etc.
Obvious advantage.
In the processing and forming of face, the buckling deformation for controlling big plane product is supported, ensures cantilever and isolated island feature
Smoothly shaping plays decisive role.Suffered power is supported in the moulding process of Constraint surface face, is also wrapped in addition to part gravity
Include the pulling force of cured layer.Because cured layer is far longer than the gravity of part itself, generally use increase circle for the pulling force of support
Post supports the mode of diameter, to ensure that support has enough strength and stabilities.But the diameter of increase support can bring two
Point problem.One is due to the waste for causing material, improves the cost of manufacture of part.Second, if support diameter is too big, it is unfavorable for
The removal of support, increase part post-processing difficulty, while influence surface quality of workpieces.
The content of the invention
To solve the shortcomings of the prior art, the invention discloses a kind of Constraint surface face to be molded increasing material manufacturing system zero
Part supporting construction exposure compensation, the present invention pass through the side to supporting the less feature of homalographic to take extra exposure to compensate
Method, increase supporting construction intensity, improve part crudy.
To achieve the above object, concrete scheme of the invention is as follows：
Face is molded increasing material manufacturing systematic part supporting construction exposure compensation, including：
Step 1：Slicing treatment carried out according to given thickness z to the digital geometry model of part supporting construction, and according to
Obtained two-dimentional section information generates corresponding mask image；
Step 2：Total number of plies of mask image is read, since i=0, reads in mask figure corresponding to i-th layer of part successively
Picture, whole profiles in the i-th layer mask image are identified through image procossing；
Step 3：I-th layer of mask image is read, obtains profile total number m in i-th layer of mask image, since j is equal to 0,
Judge whether j-th of contour pixel area is less than setting value, if it is, the contour area is stored in into new mask image；
Step 4：It is Ts to resin progress hardening time to project new mask image, and projection mask image is consolidated to resin
The change time is T.
Further, in the step 1, the slicing layer thickness corresponding with part supporting construction is selected, to the part
Digital geometry model carries out slicing treatment, obtains the physical profiles of each layer of part and the mask corresponding with physical profiles
Image.
Further, the acquisition of mask image is by each layer material object parts profile of acquisition, by way of scan transformation
What storage obtained.
Further, in the step 3, the area for including pixel in each profile is calculated, when elemental area is big in profile
The profile is not processed when given area threshold；It is right when elemental area is less than or equal to given area threshold in profile
The contour area is exposed compensation.
Further, when elemental area is less than or equal to given area threshold in profile, the contour area is exposed
Light compensates, and specific method is that the profile information that elemental area in the profile is less than to given area threshold is individually stored in another
New mask image, new mask image is projected after the completion of this layer of mask image normal projection and is exposed compensation, i.e., the layer is covered
It is less than or equal to specify the profile of area to irradiate a period of time again in film image.
Further, in the step 3, to this layer of obtained whole m profile, since j=0, jth is calculated successively
The elemental area of individual profile.
Further, according to Gaussian distribution model, the light energy of any is by all pixels point in peripheral region S Lai really
It is fixed, solidification needed for light energy threshold value E different according to used resin materialeNeed to be determined according to experiment, corresponding area threshold
SminObtained simultaneously from experiment.
Further, when pixel region area is less than or equal to given area threshold SminWhen, the edges of regions pixel luminous energy
Amount is less than central area energy, and is slightly less than solidification threshold value, in order that obtained solidification shape needs to carry out close to theoretical shape
Exposure compensating, by the way that profile j information is individually stored in into another new mask image, when complete in mask image corresponding to i-th layer
After m, portion profile all traversal processings, new mask image time for exposure Ts is projected.
Further, i-th layer of corresponding mask image exposure regular hour T is projected；Projection is all completed until whole n-layers to expose
Light, then complete the processing of part.
Further, project new mask image time for exposure Ts is obtained by empirical equation Ts=C × T, and wherein coefficient C takes
0.2-0.3.
Face is molded increasing material manufacturing systematic part supporting construction exposure compensating device, including：Including forming parts platform, resin
Groove, bearing, projector, Electrical Control making sheet and Linear slide platform；
Projector is connected with Electrical Control making sheet, and Electrical Control making sheet is connected with Linear slide platform, Linear slide platform bottom and bearing phase
Even, resin storage tank being fixed with bearing, resin liquid being provided with resin storage tank, forming parts platform is set above resin liquid, zero
Part shaped platform is connected with the top of Linear slide platform；
When starting processing, forming parts platform moves under the drive of Linear slide platform to be in contact with resin storage tank upper surface,
Total number of plies n of parts to be processed is read in Electrical Control making sheet, since i=0, reads in mask image corresponding to i-th layer of part successively,
And control the projector projects image；After the completion of mask image exposure, i-th layer of process finishing, Electrical Control making sheet control line
Property slide unit drive shaped platform to move up a thickness z, start the processing of i+1 layer, until i=n, that is, complete whole part plus
Work.
It is connected between the projector and Electrical Control making sheet and between Electrical Control making sheet and Linear slide platform by data wire.
At the median plane of the projecting direction face bearing of the projector.
The Electrical Control making sheet control line slide unit drives shaped platform to move up and down.
Beneficial effects of the present invention：
The present invention supports the mode of diameter compared to tradition increase, and the support exposure compensating mode that this method uses can be in reality
Now the smooth shaping of smaller support diameter reduces the waste of resin material；It is less than simultaneously using contour identification area and specifies area
This mode of the feature of threshold value, in addition to supporting construction is identified, the tiny characteristics in part are may recognize that, it is thin by increasing
The time for exposure of small feature can be obviously improved the intensity of tiny characteristics, avoid pull-up motion between layers to tiny characteristics
Destruction, improve part success rate；Using less support diameter dimension can be used after this method, supported in post processing
It is convenient to remove, small on surface quality of workpieces influence, thus can improve surface quality, reduces the post processing amount of labour.
Brief description of the drawings
Fig. 1 light energies Gaussian distribution model and solidification shape；
Fig. 2 present invention relies on hardware configuration；
Fig. 3 algorithm flow charts.
In figure, 1 is forming parts platform, and 2 be resin liquid, and 3 be resin storage tank, and 4 be bearing, and 5 be projector, and 6 be electromechanics
Control panel, 7 be Linear slide platform.
Embodiment：
The present invention is described in detail below in conjunction with the accompanying drawings：
As shown in Fig. 2 the present invention relies on hardware configuration, including forming parts platform 1, resin liquid 2, resin storage tank 3, bearing
4th, projector 5, Electrical Control making sheet 6, Linear slide platform 7.
Projector 5 is connected with Electrical Control making sheet 6, and Electrical Control making sheet 6 is connected with Linear slide platform 7, the bottom of Linear slide platform 7 and branch
Seat 4 is connected, and resin storage tank 3 is fixed with bearing 4, is provided with resin liquid 2 in resin storage tank 3, the top of resin liquid 2 set part into
Type platform 1, forming parts platform 1 are connected with the top of Linear slide platform 7.
The hardware configuration operation principle that the present invention relies on is：When starting processing, forming parts platform 1 is in Linear slide platform 7
Drive under move to and be in contact with the upper surface of resin storage tank 2, total number of plies n of parts to be processed is read in Electrical Control making sheet 6, from i=0
Start, read in mask image corresponding to i-th layer of part successively, and control projecting apparatus 5 to project the image；When mask image has exposed
Cheng Hou, i-th layer of process finishing, Electrical Control making sheet 6 control Linear slide platform 7 to drive shaped platform 1 to move up a thickness z, start
I+1 layer is processed, until i=n, that is, complete the processing of whole part.
As shown in figure 3, Constraint surface face is molded increasing material manufacturing systematic part supporting construction exposure compensation, including：
Step 1：1.1, according to the required precision of part, select suitable slice thickness, to the digital geometry mould of the part
Type carries out slicing treatment, to obtain each layer of material object parts profile；
1.2 by each layer material object parts profile of acquisition, and mask image is stored as by way of scan transformation.
Step 2：Total number of plies n of part mask image is read, since i=0, reads in corresponding to i-th layer of part and covers successively
Film image, whole profiles in the i-th layer mask image are identified through image procossing；
Step 3：The m profile that 3.1 pairs of step 2 obtain, since j=0, the pixel faces of j-th of profile are calculated successively
Product；
3.2 are determined according to Gaussian distribution model, the light energy of any by all pixels point in peripheral region S, according to
The solidification threshold value of used resin material, when pixel region is equal to SminWhen, the edges of regions pixel light energy is less than central area
Energy, and it is slightly less than solidification threshold value, it is therefore desirable to it is exposed compensation, prolonging exposure time Ts；
If elemental area corresponding to 3.3 profile j is less than given area threshold Smin, then by profile j information, individually deposit is another
One mask image.
Step 4：4.1 mask images started with from i=0 layers in step 2 expose regular hour T to i-th layer；
4.2 for i-th layer of mask image, and the new images obtained using step 3 are exposed compensation, i.e., the layer covered
The profile for being less than given side product in film image irradiates a period of time Ts again.
According to Gaussian distribution model, as shown in figure 1, the light energy of any by all pixels point in peripheral region S Lai really
It is fixed, solidification needed for light energy threshold value E different according to used resin materialeNeed to be determined according to experiment, corresponding area threshold
SminIt can also be obtained simultaneously from experiment.When pixel region area is less than or equal to given area threshold SminWhen, the edges of regions
Pixel light energy is less than central area energy, and is slightly less than solidification threshold value, therefore in order that the close theory of obtained solidification shape
Shape needs to be exposed compensation, by the way that profile j information is individually stored in into another mask image LayerImagei_s, when
In mask image LayerImagei corresponding to i-th layer after whole m profiles all traversal processings, projection LayerImagei_s exposures
Time Ts；
I-th layer of projection corresponding mask image LayerImagei exposure regular hours T；Until whole n-layers are all completed to project
Exposure, then complete the processing of part.
Time for exposure Ts can be obtained by empirical equation Ts=C × T, and wherein coefficient C takes 0.2-0.3.
The mode of the invention that diameter is supported compared to tradition increase, the support exposure compensating mode of use can be smaller in realization
The smooth shaping of support diameter reduces the waste of resin material；Increasing the time for exposure of tiny characteristics simultaneously can be obviously improved
The intensity of tiny characteristics, destruction of the pull-up motion to tiny characteristics between layers is avoided, improves part success rate；Using
Less support diameter dimension can be used after this method, support removal is convenient in post processing, and surface quality of workpieces is influenceed
It is small, thus surface quality can be improved, reduce the post processing amount of labour.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. Constraint surface face is molded increasing material manufacturing systematic part supporting construction exposure compensation, it is characterized in that, including：
Step 1：Slicing treatment carried out according to given thickness z to the digital geometry model of part supporting construction, and according to obtaining
Two-dimentional section information generate corresponding mask image；
Step 2：Total number of plies of mask image is read, since i=0, reads in mask image corresponding to i-th layer of part, warp successively
Image procossing identifies whole profiles in the i-th layer mask image；
Step 3：I-th layer of mask image is read, obtains profile total number m in i-th layer of mask image, since j is equal to 0, is judged
Whether j-th of contour pixel area is less than setting value, if it is, the contour area is stored in into new mask image；
Step 4：It is T to resin progress hardening time to project i-th layer of mask image, projects new mask image and resin is consolidated
The change time is Ts.
2. Constraint surface face as claimed in claim 1 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, in the step 1, the slicing layer thickness corresponding with part supporting construction is selected, to the digital geometry mould of the part
Type carries out slicing treatment, obtains the physical profiles of each layer of part and the mask image corresponding with physical profiles.
3. Constraint surface face as claimed in claim 1 or 2 is molded increasing material manufacturing systematic part supporting construction exposure compensation,
It is characterized in that the acquisition of mask image is by each layer material object parts profile of acquisition, store to obtain by way of scan transformation
's.
4. Constraint surface face as claimed in claim 1 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, in the step 3, calculates the area for including pixel in each profile, when elemental area is more than given area in profile
The profile is not processed during threshold value；When elemental area is less than or equal to given area threshold in profile, to the contour area
It is exposed compensation.
5. Constraint surface face as claimed in claim 4 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, when elemental area is less than or equal to given area threshold in profile, compensation is exposed to the contour area, specifically
Method is that the profile information that elemental area in the profile is less than or equal to given area threshold is individually stored in another new mask
Image, new mask image is projected after the completion of this layer of mask image normal projection and is exposed compensation, i.e., to this layer of mask image
In be less than or equal to specify area profile irradiate again a period of time.
6. Constraint surface face as claimed in claim 1 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, in the step 3, to the obtained i layers m profile of whole, since j=0, calculates the picture of j-th of profile successively
Vegetarian noodles accumulates.
7. Constraint surface face as claimed in claim 4 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, according to Gaussian distribution model, the light energy of a pixel is determined by all pixels point in peripheral region S, root
Different, the light energy threshold value E needed for solidification according to used resin materialeNeed to be determined according to experiment, corresponding area threshold SminTogether
When obtained from experiment.
8. Constraint surface face as claimed in claim 7 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, when pixel region area is less than or equal to given area threshold SminWhen, the edges of regions pixel light energy is less than center
Region energy, and it is slightly less than solidification threshold value, in order that obtained solidification shape needs to be exposed compensation close to theoretical shape, lead to
Cross and profile j information is individually stored in another new mask image, when whole m profile be all in mask image corresponding to i-th layer
After traversal processing, new mask image time for exposure Ts is projected.
9. Constraint surface face as claimed in claim 8 is molded increasing material manufacturing systematic part supporting construction exposure compensation, its
It is characterized in, projects i-th layer of corresponding mask image exposure regular hour T；Until whole n-layers all complete projection exposure, then complete
The processing of part；Project new mask image time for exposure Ts is obtained by empirical equation Ts=C × T, and wherein coefficient C takes 0.2-
0.3。
10. claim 1,2 or 4-9 it is any as described in Constraint surface face shaping increasing material manufacturing systematic part supporting construction exposure
The exposure compensating device of compensation method, including：Forming parts platform, resin storage tank, bearing, projector, Electrical Control making sheet and linear
Slide unit；
Projector is connected with Electrical Control making sheet, and Electrical Control making sheet is connected with Linear slide platform, and Linear slide platform bottom is connected with bearing, branch
Resin storage tank is fixed with seat, resin liquid is provided with resin storage tank, forming parts platform, forming parts are set above resin liquid
Platform is connected with the top of Linear slide platform；
When starting processing, forming parts platform moves under the drive of Linear slide platform to be in contact with resin storage tank upper surface, electromechanical
Control panel reads total number of plies n of parts to be processed, since i=0, reads in mask image corresponding to i-th layer of part successively, and control
The projector projects processed image；After the completion of mask image exposure, i-th layer of process finishing, Electrical Control making sheet control line is slided
Platform drives shaped platform to move up a thickness z, starts the processing of i+1 layer, until i=n, that is, complete the processing of whole part.
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| CN201510603781.8A CN105120182B (en) | 2015-09-21 | 2015-09-21 | Face is molded increasing material manufacturing systematic part supporting construction exposure compensation and device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105425546B (en) * | 2015-12-30 | 2017-09-29 | 大族激光科技产业集团股份有限公司 | A kind of method of DLP exposure energies homogenization |
| CN106042390B (en) * | 2016-07-28 | 2018-02-23 | 北京工业大学 | A kind of multi-source large scale face exposes 3D printing method |
| CN109754402B (en) * | 2018-03-15 | 2021-11-19 | 京东方科技集团股份有限公司 | Image processing method, image processing apparatus, and storage medium |
| CN111016179B (en) * | 2019-12-02 | 2021-11-23 | 西安铂力特增材技术股份有限公司 | Variable-layer-thickness subdivision calculation method based on additive manufacturing |
| CN112873824B (en) * | 2021-01-11 | 2022-12-16 | 深圳市创想三维科技股份有限公司 | 3D printing picture exposure method and device, electronic equipment and storage medium |
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