CN105120182A - Exposure compensation method and apparatus for part supporting structure of surface molding type additive manufacturing system - Google Patents
Exposure compensation method and apparatus for part supporting structure of surface molding type additive manufacturing system Download PDFInfo
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- CN105120182A CN105120182A CN201510603781.8A CN201510603781A CN105120182A CN 105120182 A CN105120182 A CN 105120182A CN 201510603781 A CN201510603781 A CN 201510603781A CN 105120182 A CN105120182 A CN 105120182A
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Abstract
The invention discloses an exposure compensation method and apparatus for a part supporting structure of a surface molding type additive manufacturing system. The method includes the steps: conducting slice processing on a digital geometric model of a part, and obtaining the entity contour of each layer of the part and a mask layer image corresponding to the entity contour; sequentially reading in the mask layer image corresponding to each layer of the part, and identifying all contours in the mask layer image of each layer; calculating the pixel area of each contour, conducting exposure compensation if the pixel area of each contour is equal to a given area threshold, and prolonging the exposure time; and separately storing the information of the contour in another mask layer image if the pixel area of each contour is smaller than a given area threshold, and conducting exposure compensation. Through adoption of the exposure compensation mode, successful molding of a support structure with a relatively small diameter is achieved, the waste of resin is reduced. Moreover, the exposure time of fine characteristics is increased, the intensity of the fine characteristics is obviously improved, the fine characteristics are prevented from being damaged by upward pulling motions among layers, and the part success rate is increased.
Description
Technical field
The present invention relates to and increase material manufacturing technology field, be specifically related to a kind of face forming part supporting construction exposure compensation and device.
Background technology
Increasing material manufacture is the emerging manufacture method being integrated with the multiple technologies such as numerical DC speed, advanced material, information network, and with the cut in conventional fabrication processes, the technology modes such as forging are different, and increasing material manufacture is produce physical item by the method for increase material.Have broad application prospects at numerous areas, as industrial products conceptual design, rapid mold manufacture, the aspects such as medical application.Face forming manufacture technique is a kind of increasing manufacture process based on projection, has obvious advantage in shaping speed, precision etc.
In the processing and forming of face, supporting the buckling deformation for controlling large plane product, ensureing that cantilever and the shaping smoothly of isolated island feature play decisive role.Support suffered power in the moulding process of Constraint surface face, except part gravity, also comprise the pulling force of cured layer.Because cured layer is far longer than the gravity of part self for the pulling force supported, usually adopt the mode increasing cylindrical support diameter, to ensure to support, there is enough strength and stabilities.But increase the diameter supported and can bring 2 problems.One is the waste owing to causing material, improves the cost of manufacture of part.Two is too large if support diameter, is unfavorable for the removal supported, increases part post-processing difficulty, affect surface quality of workpieces simultaneously.
Summary of the invention
For solving the deficiency that prior art exists, the invention discloses a kind of Constraint surface face shaping increasing material manufacturing system part supporting construction exposure compensation, the method that the present invention takes extra exposure to compensate by the feature less to support homalographic, increase supporting construction intensity, improve part crudy.
For achieving the above object, concrete scheme of the present invention is as follows:
Face shaping increasing material manufacturing system part supporting construction exposure compensation, comprising:
Step one: according to given thickness z, slicing treatment is carried out to the digital geometry model of part supporting construction, and generate corresponding mask image according to the two-dimensional layer surface information obtained;
Step 2: the total number of plies reading mask image, from i=0, reads in the mask image that part i-th layer is corresponding successively, identifies the whole profiles in the i-th layer mask image through image procossing;
Step 3: read i-th layer of mask image, obtains the total number m of profile in i-th layer of mask image, equals 0 from j, judges whether a jth contour pixel area is less than set point, if so, by this contour area stored in new mask image;
Step 4: it is Ts that the new mask image that projects is cured the time to resin, it is T that projection mask image is cured the time to resin.
Further, in described step one, select the slicing layer thickness corresponding with part supporting construction, slicing treatment is carried out to the digital geometry model of this part, obtain the physical profiles of the part of every one deck and the mask image corresponding with physical profiles.
Further, the acquisition of mask image is each layer material object parts profile that will obtain, and is stored obtain by the mode of scan transformation.
Further, in described step 3, calculate the area comprising pixel in each profile, when elemental area in profile is greater than given area threshold, this profile is not processed; When elemental area is less than or equal to given area threshold in profile, exposure compensating is carried out to this contour area.
Further, when in profile, elemental area is less than or equal to given area threshold, exposure compensating is carried out to this contour area, concrete grammar is, elemental area in this profile is less than the profile information of given area threshold separately stored in another new mask image, after this layer of mask image normal projection completes, the new mask image of projection carries out exposure compensating, namely specifies the profile of area again to irradiate a period of time to being less than or equal in this layer of mask image.
Further, in described step 3, to the whole m of this layer profile obtained, from j=0, calculate the elemental area of a jth profile successively.
Further, according to Gaussian distribution model, the light energy of any is determined by all pixels in peripheral region S, different according to used resin material, the required light energy threshold value E of solidification
eneed experimentally to determine, corresponding area threshold S
minobtain from experiment simultaneously.
Further, when pixel region area is less than or equal to given area threshold S
mintime, this edges of regions pixel light energy is less than central area energy, and be slightly less than solidification threshold value, need to carry out exposure compensating close to theoretical shape to make the solidification shape obtained, by by the information of profile j separately stored in another new mask image, when in i-th layer of corresponding mask image all m profile all after traversal processing, project new mask image time for exposure Ts.
Further, project i-th layer of corresponding mask image exposure regular hour T; Until all n layer all completes projection exposure, then complete the processing of part.
Further, project new mask image time for exposure Ts and obtained by empirical equation Ts=C × T, wherein coefficient C gets 0.2-0.3.
Face shaping increasing material manufacturing system part supporting construction exposure compensating device, comprising: comprise forming parts platform, resin storage tank, 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, and Linear slide platform bottom is connected with bearing, bearing is fixed with resin storage tank, be provided with resin liquid in resin storage tank, arrange forming parts platform above resin liquid, forming parts platform is connected with the top of Linear slide platform;
Start to add man-hour, forming parts platform moves to and contacts with resin storage tank upper surface under the drive of Linear slide platform, and total number of plies n of part to be processed is read in Electrical Control making sheet, from i=0, read in the mask image that part i-th layer is corresponding successively, and control this image of projector projects; After mask image has exposed, the process finishing of i-th layer, Electrical Control making sheet control linear slide unit has driven on shaped platform and has moved a thickness z, starts the i-th+1 layer processing, until i=n, namely completes the processing of whole part.
Between described projector with Electrical Control making sheet and Electrical Control making sheet be all connected by data wire with between Linear slide platform.
The projecting direction of described projector is just to the median plane place of bearing.
Described Electrical Control making sheet control linear slide unit drives shaped platform to move up and down.
Beneficial effect of the present invention:
The present invention compares tradition increases the mode supporting diameter, and the support exposure compensating mode that this method adopts can in the shaping smoothly waste decreasing resin material realizing less support diameter; Adopt contour identification area to be less than this mode of feature of specifying area threshold simultaneously, except identifying supporting construction, the tiny characteristics in part can also be identified, the intensity of tiny characteristics significantly can be promoted by the time for exposure increasing tiny characteristics, avoid the destruction of pull-up motion to tiny characteristics between layers, improve part success rate; Less support diameter dimension can be used after adopting this method, support when reprocessing and remove conveniently, little on surface quality of workpieces impact, thus can improve surface quality, reduce the reprocessing amount of labour.
Accompanying drawing explanation
Fig. 1 light energy Gaussian distribution model and solidification shape;
Fig. 2 the present invention relies on hardware configuration;
Fig. 3 algorithm flow chart.
In figure, 1 is forming parts platform, and 2 is resin liquid, and 3 is resin storage tank, and 4 is bearing, and 5 is projector, and 6 is Electrical Control making sheet, and 7 is Linear slide platform.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 2, the present invention relies on hardware configuration, comprises forming parts platform 1, resin liquid 2, resin storage tank 3, bearing 4, projector 5, Electrical Control making sheet 6, Linear slide platform 7.
Projector 5 is connected with Electrical Control making sheet 6, Electrical Control making sheet 6 is connected with Linear slide platform 7, Linear slide platform 7 bottom is connected with bearing 4, bearing 4 is fixed with resin storage tank 3, resin liquid 2 is provided with in resin storage tank 3, arrange forming parts platform 1 above resin liquid 2, forming parts platform 1 is connected with the top of Linear slide platform 7.
The hardware configuration operation principle that the present invention relies on is: when starting to add man-hour, forming parts platform 1 moves to and contacts with resin storage tank 2 upper surface under the drive of Linear slide platform 7, total number of plies n of part to be processed is read in Electrical Control making sheet 6, from i=0, read in the mask image that part i-th layer is corresponding successively, and control projecting apparatus 5 and project this image; After mask image has exposed, the process finishing of i-th layer, Electrical Control making sheet 6 control linear slide unit 7 has driven on shaped platform 1 and has moved a thickness z, starts the i-th+1 layer processing, until i=n, namely completes the processing of whole part.
As shown in Figure 3, Constraint surface face shaping increasing material manufacturing system part supporting construction exposure compensation, comprising:
Step one: 1.1, according to the required precision of part, select suitable slice thickness, carry out slicing treatment to the digital geometry model of this part, to obtain the material object parts profile of every one deck;
The 1.2 each layer material object parts profiles that will obtain, are stored as mask image by the mode of scan transformation.
Step 2: the total number of plies n reading part mask image, from i=0, reads in the mask image that part i-th layer is corresponding successively, identifies the whole profiles in the i-th layer mask image through image procossing;
Step 3: m the profile that 3.1 pairs of step 2 obtain, from j=0, calculates the elemental area of a jth profile successively;
3.2 according to Gaussian distribution model, and the light energy of any is determined by all pixels in peripheral region S, according to the solidification threshold value of used resin material, when pixel region equals S
mintime, this edges of regions pixel light energy is less than central area energy, and is slightly less than solidification threshold value, therefore needs to carry out exposure compensating, prolonging exposure time Ts;
If the elemental area that 3.3 profile j are corresponding is less than given area threshold S
min, then by the information of profile j separately stored in another mask image.
Step 4: 4.1 utilize the mask image in step 2 to expose regular hour Ts to i-th layer from i=0 layer.4.2 for the mask image of i-th layer, and the new images utilizing step 3 to obtain carries out exposure compensating, namely again irradiates a period of time Ts to the profile being less than given side in this layer of mask image long-pending.
According to Gaussian distribution model, as shown in Figure 1, the light energy of any is determined by all pixels in peripheral region S, different according to used resin material, the required light energy threshold value E of solidification
eneed experimentally to determine, corresponding area threshold S
minalso can obtain from experiment simultaneously.When pixel region area is less than or equal to given area threshold S
mintime, this edges of regions pixel light energy is less than central area energy, and be slightly less than solidification threshold value, therefore in order to make the solidification shape obtained need to carry out exposure compensating close to theoretical shape, by by the information of profile j separately stored in another mask image LayerImagei_s, when in i-th layer of corresponding mask image LayerImagei all m profile all after traversal processing, project LayerImagei_s time for exposure Ts;
The i-th layer of corresponding mask image LayerImagei that project exposes regular hour T; Until all n layer all completes projection exposure, then complete the processing of part.
Time for exposure Ts can be obtained by empirical equation Ts=C × T, and wherein coefficient C gets 0.2-0.3.
The present invention compares tradition increases the mode supporting diameter, and the support exposure compensating mode of employing can in the shaping smoothly waste decreasing resin material realizing less support diameter; The time for exposure simultaneously increasing tiny characteristics significantly can promote the intensity of tiny characteristics, avoids the destruction of pull-up motion to tiny characteristics between layers, improves part success rate; Less support diameter dimension can be used after adopting this method, support when reprocessing and remove conveniently, little on surface quality of workpieces impact, thus can improve surface quality, reduce the reprocessing amount of labour.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a shaping increasing material manufacturing system part supporting construction exposure compensation, is characterized in that, comprising:
Step one: according to given thickness z, slicing treatment is carried out to the digital geometry model of part supporting construction, and generate corresponding mask image according to the two-dimensional layer surface information obtained;
Step 2: the total number of plies reading mask image, from i=0, reads in the mask image that part i-th layer is corresponding successively, identifies the whole profiles in the i-th layer mask image through image procossing;
Step 3: read i-th layer of mask image, obtains the total number m of profile in i-th layer of mask image, equals 0 from j, judges whether a jth contour pixel area is less than set point, if so, by this contour area stored in new mask image;
Step 4: it is Ts that the new mask image that projects is cured the time to resin, it is T that projection mask image is cured the time to resin.
2. face as claimed in claim 1 shaping increasing material manufacturing system part supporting construction exposure compensation, it is characterized in that, in described step one, select the slicing layer thickness corresponding with part supporting construction, slicing treatment is carried out to the digital geometry model of this part, obtains the physical profiles of the part of every one deck and the mask image corresponding with physical profiles.
3. face as claimed in claim 1 or 2 shaping increasing material manufacturing system part supporting construction exposure compensation, is characterized in that, the acquisition of mask image is each layer material object parts profile that will obtain, and is stored obtain by the mode of scan transformation.
4. face as claimed in claim 1 shaping increasing material manufacturing system part supporting construction exposure compensation, it is characterized in that, in described step 3, calculate the area comprising pixel in each profile, when elemental area in profile is greater than given area threshold, this profile is not processed; When elemental area is less than or equal to given area threshold in profile, exposure compensating is carried out to this contour area.
5. face as claimed in claim 4 shaping increasing material manufacturing system part supporting construction exposure compensation, it is characterized in that, when in profile, elemental area is less than or equal to given area threshold, exposure compensating is carried out to this contour area, concrete grammar is, elemental area in this profile is less than the profile information of given area threshold separately stored in another new mask image, after this layer of mask image normal projection completes, the new mask image of projection carries out exposure compensating, namely specifies the profile of area again to irradiate a period of time to being less than or equal in this layer of mask image.
6. face as claimed in claim 1 shaping increasing material manufacturing system part supporting construction exposure compensation, is characterized in that, in described step 3, to the whole m of this layer profile obtained, from j=0, calculates the elemental area of a jth profile successively.
7. face as claimed in claim 4 shaping increasing material manufacturing system part supporting construction exposure compensation, it is characterized in that, according to Gaussian distribution model, the light energy of any is determined by all pixels in peripheral region S, different according to used resin material, the required light energy threshold value E of solidification
eneed experimentally to determine, corresponding area threshold S
minobtain from experiment simultaneously.
8. face as claimed in claim 7 shaping increasing material manufacturing system part supporting construction exposure compensation, is characterized in that, when pixel region area is less than or equal to given area threshold S
mintime, this edges of regions pixel light energy is less than central area energy, and be slightly less than solidification threshold value, need to carry out exposure compensating close to theoretical shape to make the solidification shape obtained, by by the information of profile j separately stored in another new mask image, when in i-th layer of corresponding mask image all m profile all after traversal processing, project new mask image time for exposure Ts.
9. face as claimed in claim 8 shaping increasing material manufacturing system part supporting construction exposure compensation, is characterized in that, project i-th layer of corresponding mask image exposure regular hour T; Until all n layer all completes projection exposure, then complete the processing of part; Project new mask image time for exposure Ts to be obtained by empirical equation Ts=C × T, wherein coefficient C gets 0.2-0.3.
10. a shaping increasing material manufacturing system part supporting construction exposure compensating device, comprising: comprise forming parts platform, resin storage tank, 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, and Linear slide platform bottom is connected with bearing, bearing is fixed with resin storage tank, be provided with resin liquid in resin storage tank, arrange forming parts platform above resin liquid, forming parts platform is connected with the top of Linear slide platform;
Start to add man-hour, forming parts platform moves to and contacts with resin storage tank upper surface under the drive of Linear slide platform, and total number of plies n of part to be processed is read in Electrical Control making sheet, from i=0, read in the mask image that part i-th layer is corresponding successively, and control this image of projector projects; After mask image has exposed, the process finishing of i-th layer, Electrical Control making sheet control linear slide unit has driven on shaped platform and has moved a thickness z, starts the i-th+1 layer processing, until i=n, namely completes 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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| 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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| CN112873824A (en) * | 2021-01-11 | 2021-06-01 | 深圳市创想三维科技有限公司 | 3D printing picture exposure method and device, electronic equipment and storage medium |
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