CN104142574A - Laser scanning device and method for making three-dimensional object - Google Patents
Laser scanning device and method for making three-dimensional object Download PDFInfo
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- CN104142574A CN104142574A CN201410301764.4A CN201410301764A CN104142574A CN 104142574 A CN104142574 A CN 104142574A CN 201410301764 A CN201410301764 A CN 201410301764A CN 104142574 A CN104142574 A CN 104142574A
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Abstract
The invention provides a laser scanning device and method for making a three-dimensional object. The laser scanning device comprises a laser device, a galvanometer system, a control system and a beam adjustment system. The control system divides spots to be scanned on each section of a workpiece into an outline region and a filling region; when the outline region is scanned, the control system controls the laser device through the galvanometer system and controls the beam adjustment system at the same time to select first light spots with a smaller size for scanning; when the filling region is scanned, the control system controls the laser device through the galvanometer system and controls the beam adjustment system at the same time to select second light spots with a larger size for scanning. According to the laser scanning device and method for making the three-dimensional object, by the adoption of a regional scanning mode, the forming speed of the three-dimensional object is increased on the premise of guaranteeing the accuracy of the made three-dimensional object.
Description
Technical field
The invention belongs to three-dimensional body and manufacture field, be specifically related to a kind of laser scanning device for the manufacture of three-dimensional body and method thereof.
Background technology
The manufacture method of three-dimensional body mainly comprises hierarchy slicing, send paving powder, laser scanning processing step, and wherein laser scanning is to affect the precision of three-dimensional body and the key factor of shaping speed.The manufacture method of existing three-dimensional body, as laser scanning step 1, adopt the single hot spot of same size to scan, this Laser Scanning can be realized the manufacture of three-dimensional body, but owing to adopting the hot spot of reduced size to scan, improved the precision of three-dimensional body, the shaping speed of the three-dimensional body that but slowed down simultaneously; And if the hot spot that adopts large-size is when scan, improve the shaping speed of three-dimensional body, may affect the formed precision of three-dimensional body simultaneously, therefore, adopt the single light spot scanning method of prior art to manufacture three-dimensional body, be difficult to reach the effect of high precision, high shaping speed.
Summary of the invention
The object of the invention is to, the problem existing for prior art, a kind of laser scanning device for the manufacture of three-dimensional body and method thereof are provided, and this laser scanning device and method thereof, under the prerequisite of the three-dimensional body precision that guarantees to make, have improved the shaping speed of three-dimensional body.
For solving the problems of the technologies described above, the invention provides a kind of laser scanning device for the manufacture of three-dimensional body, comprise laser instrument, galvanometer system, control system and beam adjustment system, described control system is divided into profile region and fill area by the point to be scanned in each cross section of product, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan; When scanning filling district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to scan.
Preferably, described beam adjustment system comprises fixed multiplying power beam expanding lens, F-Theta lens and diaphragm, described laser instrument, fixed multiplying power beam expanding lens, galvanometer system and F-Theta lens form the first optical path unit, described F-Theta lens for forming the laser beam reflecting by galvanometer system the evenly focal beam spot of size on working face, described fixed multiplying power beam expanding lens is arranged between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between fixed multiplying power beam expanding lens and galvanometer system, when scanning filling district, decline diaphragm, make diaphragm not appear at the first optical path unit.
Preferably, described beam adjustment system comprises dynamic focussing module and diaphragm, described dynamic focussing module comprises dynamic divergent mirror and focus lamp, described laser instrument, dynamic divergent mirror, focus lamp and galvanometer system form the second optical path unit, described dynamic divergent mirror, focus lamp are successively set between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between dynamic divergent mirror and condensing lens, when scanning filling district, decline diaphragm, makes diaphragm not appear at the second optical path unit.
Preferably, described beam adjustment system comprises variable power beam expanding lens and F-Theta lens, described variable power beam expanding lens is arranged between laser instrument and galvanometer system, described F-Theta lens for forming the laser beam reflecting by galvanometer system the evenly focal beam spot of size on working face, and described the first hot spot and the second hot spot are by regulating the multiplying power of variable power beam expanding lens to obtain respectively.
Preferably, described the first hot spot and the second hot spot meet formula: d
2≤ 2d
1, d wherein
1be the first spot size, d
2it is the second spot size.
The present invention provides again a kind of equipment for the manufacture of three-dimensional body, comprises hierarchy slicing system and powder sending and laying device, and wherein, this equipment also comprises the above-mentioned laser scanning device for the manufacture of three-dimensional body.
The present invention also provides a kind of Laser Scanning for the manufacture of three-dimensional body, comprises the following steps:
Step 1: control system is divided into profile region and fill area by the point to be scanned in each cross section of product;
Step 2: when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan; When scanning filling district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to scan;
Step 3: repeated execution of steps one and step 2 are until three-dimensional body moulding.
Preferably, adopt same scan spacing to line by line scan to fill area.
Preferably, scanning filling district specifically comprises the following steps:
Control system is calculated according to formula A=W/B and is judged whether A is integer;
When A is integer, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan to fill area;
When A is non-integer, the integral part of A is denoted as to Z, the 1st to walk to Z capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan; Z+1 is capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan;
Wherein, W be in each cross section of product perpendicular to the length of direction of scanning, B is scanning light spot spacing, the line-spacing of described the 1st row equals B, the line-spacing that Z+1 is capable is less than B.
Preferably, described Laser Scanning is realized by above-mentioned laser scanning device.
Laser scanning device for the manufacture of three-dimensional body of the present invention, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, select the first less hot spot of size to scan, thereby guaranteed the precision of three-dimensional body; During Er scanning filling district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select larger-size the second hot spot to scan, so just, improved the shaping speed of three-dimensional body, therefore, the laser scanning device for the manufacture of three-dimensional body of the present invention is by adopting the mode of subarea-scanning, under the prerequisite of the three-dimensional body precision that guarantees to make, improved the shaping speed of three-dimensional body.
Equipment for the manufacture of three-dimensional body of the present invention, comprises laser scanning device, and this installs when scanning profile district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select the first less hot spot of size to scan, thereby guaranteed the precision of three-dimensional body; During Er scanning filling district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select larger-size the second hot spot to scan, so just, improved the shaping speed of three-dimensional body, therefore, the equipment for the manufacture of three-dimensional body of the present invention is by adopting the mode of subarea-scanning, under the prerequisite of the three-dimensional body precision that guarantees to make, improved the shaping speed of three-dimensional body.
Laser Scanning for the manufacture of three-dimensional body of the present invention, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, select the first less hot spot of size to scan, thereby guaranteed the precision of three-dimensional body; During Er scanning filling district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select larger-size the second hot spot to scan, so just, improved the shaping speed of three-dimensional body, therefore, the Laser Scanning for the manufacture of three-dimensional body of the present invention is by adopting the mode of subarea-scanning, under the prerequisite of the three-dimensional body precision that guarantees to make, improved the shaping speed of three-dimensional body.
Accompanying drawing explanation
The scanning schematic diagram of the embodiment that Fig. 1 provides for the manufacture of the Laser Scanning of three-dimensional body for the present invention;
The scanning light spot energy profile of the embodiment that Fig. 2 provides for the manufacture of the Laser Scanning of three-dimensional body for the present invention;
The structural drawing of the embodiment mono-that Fig. 3 provides for the manufacture of the laser scanning device of three-dimensional body for the present invention;
The structural drawing of the embodiment bis-that Fig. 4 provides for the manufacture of the laser scanning device of three-dimensional body for the present invention;
Fig. 5 is a kind of index path in embodiment bis-;
Fig. 6 is another kind of index path in embodiment bis-;
The structural drawing of the embodiment tri-that Fig. 7 provides for the manufacture of the laser scanning device of three-dimensional body for the present invention;
The method flow diagram of the embodiment tetra-that Fig. 8 provides for the manufacture of the Laser Scanning of three-dimensional body for the present invention.
Marginal data:
1, CO
2laser instrument; 2, dynamic divergent mirror; 3, focus lamp; 4, F-Theta lens; 5, fixed multiplying power beam expanding lens; 6, variable power beam expanding lens; 7, diaphragm; 8, galvanometer system; 9, working face, 10, fiber laser, 11, optical fiber, 12, optical fiber collimator; 13, X-axis galvanometer; 14, Y-axis galvanometer.
Embodiment
The manufacture method of existing three-dimensional body, as laser scanning step 1, adopt the single hot spot of same size to scan, although this Laser Scanning can be realized the manufacture of three-dimensional body, the three-dimensional body finally making is difficult to have concurrently high precision, high efficiency advantage.Continuous research through inventor is found, the nucleus that affects three-dimensional body precision is the point of product, therefore in order not only to improve precision but also accelerate shaping speed, can carry out subarea-scanning for every one deck xsect of product, to manufacture the three-dimensional body of high precision, high shaping speed.
Inventor conceives based on foregoing invention, a kind of laser scanning device for the manufacture of three-dimensional body is provided, comprise laser instrument, galvanometer system, control system and beam adjustment system, described control system is divided into profile region and fill area by the point to be scanned in each cross section of product, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan; When scanning filling district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to scan.
At this, it should be noted that, the laser scanning of each xsect of product is all to realize according to the method described above, when cross-sectional scans each time, control system is distinguished point and the filling point of product, and all point of product are summarized as to profile region, and all filling points of product are summarized as to fill area.
In concrete enforcement, described beam adjustment system can be realized by following several embodiments:
Embodiment one: described beam adjustment system comprises fixed multiplying power beam expanding lens, F-Theta lens and diaphragm, described laser instrument, fixed multiplying power beam expanding lens, galvanometer system and F-Theta lens form the first optical path unit, described F-Theta lens for forming the laser beam reflecting by galvanometer system the evenly focal beam spot of size on working face, described fixed multiplying power beam expanding lens is arranged between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between fixed multiplying power beam expanding lens and galvanometer system, when scanning filling district, decline diaphragm, make diaphragm not appear at the first optical path unit.
Embodiment two: described beam adjustment system comprises dynamic focussing module and diaphragm, described dynamic focussing module comprises dynamic divergent mirror and focus lamp, described laser instrument, dynamic divergent mirror, focus lamp and galvanometer system form the second optical path unit, described dynamic divergent mirror, focus lamp are successively set between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between dynamic divergent mirror and condensing lens, when scanning filling district, decline diaphragm, makes diaphragm not appear at the second optical path unit.
Diaphragm in embodiment one and embodiment two can be risen and be declined by Electric Machine Control, when diaphragm rises, be that diaphragm appears at the first optical path unit and/or the second optical path unit, be equivalent to start filtering functions, when diaphragm declines, be equivalent to close filtering functions, diaphragm does not appear in light path.Be understandable that, this is a kind of embodiment that starts and close diaphragm, certainly, can also adopt other mode to realize (as, by controlling diaphragm, in upright or horizontal level, start and close the filtering functions of diaphragm), at this, do not describe in detail.
Embodiment three: described beam adjustment system comprises variable power beam expanding lens and F-Theta lens, described variable power beam expanding lens is arranged between laser instrument and galvanometer system, described F-Theta lens for forming the laser beam reflecting by galvanometer system the evenly focal beam spot of size on working face, and described the first hot spot and the second hot spot are by regulating the multiplying power of variable power beam expanding lens to obtain respectively.
Preferably, in order further to improve precision and the shaping speed of three-dimensional body, described the first hot spot and the second hot spot should meet formula: d
2≤ 2d
1, d wherein
1be the first spot size, d
2it is the second spot size.
In concrete enforcement, described laser instrument is CO
2laser instrument or fiber laser can also be the laser instrument of other type certainly.
Laser scanning device for the manufacture of three-dimensional body of the present invention, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, select the first less hot spot of size to scan, thereby guaranteed the precision of three-dimensional body; During Er scanning filling district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select larger-size the second hot spot to scan, so just, improved the shaping speed of three-dimensional body, therefore, the laser scanning device for the manufacture of three-dimensional body of the present invention is by adopting the mode of subarea-scanning, under the prerequisite of the three-dimensional body precision that guarantees to make, improved the shaping speed of three-dimensional body.
Inventor also provides a kind of equipment for the manufacture of three-dimensional body, comprises hierarchy slicing system and powder sending and laying device, wherein also comprises the laser scanning device for the manufacture of three-dimensional body of above-mentioned arbitrary embodiment.
Equipment for the manufacture of three-dimensional body of the present invention, comprises laser scanning device, and this installs when scanning profile district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select the first less hot spot of size to scan, thereby guaranteed the precision of three-dimensional body; During Er scanning filling district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select larger-size the second hot spot to scan, so just, improved the shaping speed of three-dimensional body, therefore, the equipment for the manufacture of three-dimensional body of the present invention is by adopting the mode of subarea-scanning, under the prerequisite of the three-dimensional body precision that guarantees to make, improved the shaping speed of three-dimensional body.
Inventor also provides a kind of Laser Scanning for the manufacture of three-dimensional body, comprises the following steps:
Step 1: control system is divided into profile region and fill area by the point to be scanned in each cross section of product;
Step 2: when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan; When scanning filling district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to scan;
Step 3: repeated execution of steps one and step 2 are until three-dimensional body moulding.
In concrete enforcement, can adopt same scan spacing to line by line scan to fill area.
In order further to improve the precision of product three-dimensional body, scanning filling district can specifically realize in such a way:
Control system is calculated according to formula A=W/B and is judged whether A is integer;
When A is integer, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan to fill area;
When A is non-integer, the integral part of A is denoted as to Z, the 1st to walk to Z capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan; Z+1 is capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan;
Wherein, W be in each cross section of product perpendicular to the length of direction of scanning, B is scanning light spot spacing, the line-spacing of described the 1st row equals B, and the line-spacing that Z+1 is capable is less than B, specifically consults Fig. 1, this figure sets and along directions X, the xsect of product is scanned, and L is directions X length, and W is Y-direction length.
In concrete enforcement, in order to scan equably product to obtain high-performance product, scanning light spot spacing B can obtain in the following manner:
Several hot spots are arranged in order according to the method for adjacent spots stack;
Make the energy sum of adjacent spots overlap-add region equal the strongest energy of single hot spot;
The distance of adjacent peaks is denoted as to scanning light spot spacing B, as shown in Figure 2.
At this, it should be noted that, described Laser Scanning is realized by the laser scanning device of above-mentioned arbitrary embodiment.
Laser Scanning for the manufacture of three-dimensional body of the present invention, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, select the first less hot spot of size to scan, thereby guaranteed the precision of three-dimensional body; During Er scanning filling district, control system is controlled laser instrument by galvanometer system, control beam adjustment system simultaneously, select larger-size the second hot spot to scan, so just, improved the shaping speed of three-dimensional body, therefore, the Laser Scanning for the manufacture of three-dimensional body of the present invention is by adopting the mode of subarea-scanning, under the prerequisite of the three-dimensional body precision that guarantees to make, improved the shaping speed of three-dimensional body.
In order to enable those skilled in the art to understand better and realize technical scheme of the present invention, below in conjunction with Figure of description and specific embodiment, the present invention is described in more detail.
Embodiment mono-:
The structural drawing of the embodiment mono-that Fig. 3 provides for the manufacture of the laser scanning device of three-dimensional body for the present invention, as shown in Figure 3, laser scanning device for the manufacture of three-dimensional body comprises fiber laser 10, galvanometer system 8, control system (not shown) and beam adjustment system, described beam adjustment system comprises fixed multiplying power beam expanding lens 5, F-Theta lens 4 and diaphragm 7, fiber laser 10, fixed multiplying power beam expanding lens 5, galvanometer system 8 and F-Theta lens 4 form the first optical path unit, described F-Theta lens 4 for forming the laser beam reflecting by galvanometer system 8 the evenly focal beam spot of size on working face, described fixed multiplying power beam expanding lens 5 is arranged between fiber laser 10 and galvanometer system 8, described control system is divided into profile region and fill area by the point to be scanned in each cross section of product, when scanning profile district, rising diaphragm 7, diaphragm 7 is arranged between fixed multiplying power beam expanding lens 5 and galvanometer system 8, the divergent beams that send from fiber laser 10 are by optical fiber 11, optical fiber collimator 12 is converted to parallel beam, collimated laser beam is through fixed multiplying power beam expanding lens 5, light beam is after the part optical filtering of diaphragm 7, reflex to galvanometer system 8, galvanometer system 8 is controlled laser beam and is focused to working face 9 after by F-Theta lens 4, and form the first hot spot that size is less and carry out profile scan, when scanning filling district, decline diaphragm 7, make diaphragm 7 not appear at the first optical path unit, the laser beam of sending from fiber laser 10 reflexes to galvanometer system 8 through fixed multiplying power beam expanding lens 5, galvanometer system 8 is controlled laser beam and is focused to working face 9 after by F-Theta lens 4, and form larger-size the second hot spot and fill scanning, described the first hot spot and the second hot spot should meet formula: d
2≤ 2d
1, d wherein
1be the first spot size, d
2it is the second spot size.
Be understandable that, the occurrence of the first hot spot and the second hot spot can be determined according to the requirement of concrete precision and shaping speed by designer, after occurrence is determined, can determine by setting multiplying power, the focal length of F-Theta lens 4 and the aperture combination of diaphragm 7 of fixed multiplying power beam expanding lens 5.
Embodiment two: described beam adjustment system comprises dynamic focussing module and diaphragm, described dynamic focussing module comprises dynamic divergent mirror and focus lamp, described laser instrument, dynamic divergent mirror, focus lamp and galvanometer system form the second optical path unit, described dynamic divergent mirror, focus lamp are successively set between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between dynamic divergent mirror and condensing lens, when scanning filling district, decline diaphragm, makes diaphragm not appear at the second optical path unit.Embodiment bis-
The structural drawing of the embodiment bis-that Fig. 4 provides for the manufacture of the laser scanning device of three-dimensional body for the present invention, Fig. 5 is a kind of index path in embodiment bis-; Fig. 6 is for implementing another kind of index path in two, as shown in Figure 4, Figure 5 and Figure 6, for the manufacture of the laser scanning device of three-dimensional body, comprises CO
2laser instrument 1, galvanometer system 8, control system (not shown) and beam adjustment system, described beam adjustment system comprises dynamic focussing module and diaphragm 7, described dynamic focussing module comprises dynamic divergent mirror 2 and focus lamp 3, CO
2laser instrument 1, dynamic divergent mirror 2, focus lamp 3 and galvanometer system 8 form the second optical path units, and described dynamic divergent mirror 2, focus lamp 3 are successively set on CO
2between laser instrument 1 and galvanometer system 8, described control system is divided into profile region and fill area by the point to be scanned in each cross section of product, when scanning profile district, rising diaphragm 7, diaphragm 7 is arranged between dynamic divergent mirror 2 and condensing lens 3, the laser beam of sending from CO2 laser instrument 1 is through dynamic divergent mirror 2, light beam filters through the part of diaphragm 7, be dissipated into focus lamp 3 back reflections to X-axis galvanometer 13 and Y-axis galvanometer 14, after X, Y-axis vibration mirror reflected, focus on working face 9, and form the first hot spot that size is less and carry out profile scan (as shown in Figure 6); When scanning filling district, decline diaphragm 7, make diaphragm 7 not be arranged on the second optical path unit, the laser beam of sending from CO2 laser instrument 1 reflexes to X-axis galvanometer 13 and Y-axis galvanometer 14 through dynamic focussing module, after X, Y-axis vibration mirror reflected, focus on working face 9(as shown in Figure 5), and form larger-size the second hot spot and fill scanning, described the first hot spot and the second hot spot should meet formula: d
2≤ 2d
1, d wherein
1be the first spot size, d
2it is the second spot size.
Be understandable that, the occurrence of the first hot spot and the second hot spot can be determined according to the requirement of concrete precision and shaping speed by designer, after occurrence is determined, just can determine by setting the aperture combination of the curvature of dynamic divergent mirror 2, the focal length of focus lamp 3 and diaphragm 7.Described galvanometer system 8 comprises X-axis galvanometer 13 and Y-axis galvanometer 14.
Embodiment tri-
The structural drawing of the embodiment tri-that Fig. 7 provides for the manufacture of the laser scanning device of three-dimensional body for the present invention, as shown in Figure 7, laser scanning device for the manufacture of three-dimensional body comprises fiber laser 10, galvanometer system 8, control system (not shown) and beam adjustment system, described beam adjustment system comprises variable power beam expanding lens 6 and F-Theta lens 4, described variable power beam expanding lens 6 is arranged between fiber laser 10 and galvanometer system 8, described F-Theta lens 4 for forming the laser beam reflecting by galvanometer system 8 the evenly focal beam spot of size on working face 9, described control system is divided into profile region and fill area by the point to be scanned in each cross section of product, when scanning profile district, increase the multiplying power of variable beam expanding lens, the laser beam of sending from fiber laser 10 reflexes to galvanometer system 8 through variable power beam expanding lens 6, galvanometer system 8 is controlled laser beam and is focused to working face 9 after by F-Theta lens 4, and form the first hot spot that size is less and carry out profile scan, when scanning filling district, reduce the multiplying power of variable beam expanding lens, the divergent beams that send from fiber laser 10 are converted to parallel beam by optical fiber 11, optical fiber collimator 12, collimated laser beam reflexes to galvanometer system 8 through variable power beam expanding lens 6, galvanometer system 8 is controlled laser beam and is focused to working face 9 after by F-Theta lens 4, and form larger-size the second hot spot and carry out profile scan, described the first hot spot and the second hot spot should meet formula: d
2≤ 2d
1, d wherein
1be the first spot size, d
2it is the second spot size.
Be understandable that, the occurrence of the first hot spot and the second hot spot can be determined according to the requirement of concrete precision and shaping speed by designer, after occurrence is determined, just can combine definite by setting the multiplying power of variable power beam expanding lens 6 and the focal length of F-Theta lens 4.
Embodiment tetra-
The method flow diagram of the embodiment tetra-that Fig. 8 provides for the manufacture of the Laser Scanning of three-dimensional body for the present invention, as shown in Figure 8, comprises the following steps for the manufacture of the Laser Scanning of three-dimensional body:
Step 81: control system is divided into profile region and fill area by the point to be scanned in product one cross section, performs step 82 when scanning profile district, performs step 83 when scanning filling district;
Step 82: control system is controlled laser instrument by galvanometer system is controlled beam adjustment system simultaneously, selects the first less hot spot of size to scan;
Step 83: control system is calculated according to formula A=W/B and judged whether A is integer, performs step 84 when A is integer, otherwise execution step 85;
Step 84: control system is controlled laser instrument by galvanometer system is controlled beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan to fill area, returns to execution step 81 after this step executes;
In this step, to all row of fill area, all select larger-size the second hot spot to scan.
Step 85: the integral part of A is denoted as to Z, and the 1st to walk to Z capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan; Z+1 is capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan, and returns to execution step 81 after this step executes.
At this, it should be noted that, the moulding of three-dimensional body need to repeat the above-mentioned steps of this embodiment, when three-dimensional body moulding, can finish above-mentioned flow process.
In the present embodiment, W be in each cross section of product perpendicular to the length of direction of scanning, B is scanning light spot spacing, the line-spacing of described the 1st row equals B, the line-spacing that Z+1 is capable is less than B.
At this, it should be noted that, the product of mentioning in the application's text is three-dimensional body to be formed.
Above embodiment is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all should belong to protection scope of the present invention.It should be pointed out that some modifications and modification without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (10)
1. the laser scanning device for the manufacture of three-dimensional body, it is characterized in that, comprise laser instrument, galvanometer system, control system and beam adjustment system, described control system is divided into profile region and fill area by the point to be scanned in each cross section of product, when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan; When scanning filling district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to scan.
2. the laser scanning device for the manufacture of three-dimensional body according to claim 1, it is characterized in that, described beam adjustment system comprises fixed multiplying power beam expanding lens, F-Theta lens and diaphragm, described laser instrument, fixed multiplying power beam expanding lens, galvanometer system and F-Theta lens form the first optical path unit, described F-Theta lens for forming the laser beam reflecting by galvanometer system the evenly focal beam spot of size on working face, described fixed multiplying power beam expanding lens is arranged between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between fixed multiplying power beam expanding lens and galvanometer system, when scanning filling district, decline diaphragm, make diaphragm not appear at the first optical path unit.
3. the laser scanning device for the manufacture of three-dimensional body according to claim 1, it is characterized in that, described beam adjustment system comprises dynamic focussing module and diaphragm, described dynamic focussing module comprises dynamic divergent mirror and focus lamp, described laser instrument, dynamic divergent mirror, focus lamp and galvanometer system form the second optical path unit, described dynamic divergent mirror, focus lamp is successively set between laser instrument and galvanometer system, when scanning profile district, rising diaphragm, diaphragm is arranged between dynamic divergent mirror and condensing lens, when scanning filling district, decline diaphragm, make diaphragm not appear at the second optical path unit.
4. the laser scanning device for the manufacture of three-dimensional body according to claim 1, it is characterized in that, described beam adjustment system comprises variable power beam expanding lens and F-Theta lens, described variable power beam expanding lens is arranged between laser instrument and galvanometer system, described F-Theta lens for forming the laser beam reflecting by galvanometer system the evenly focal beam spot of size on working face, and described the first hot spot and the second hot spot are by regulating the multiplying power of variable power beam expanding lens to obtain respectively.
5. according to the laser scanning device for the manufacture of three-dimensional body described in claim 1 to 4 any one, it is characterized in that, described the first hot spot and the second hot spot meet formula: d
2≤ 2d
1, d wherein
1be the first spot size, d
2it is the second spot size.
6. for the manufacture of an equipment for three-dimensional body, comprise hierarchy slicing system and powder sending and laying device, it is characterized in that, also comprise the laser scanning device for the manufacture of three-dimensional body described in claim 1-5 any one.
7. for the manufacture of a Laser Scanning for three-dimensional body, it is characterized in that, comprise the following steps:
Step 1: control system is divided into profile region and fill area by the point to be scanned in each cross section of product;
Step 2: when scanning profile district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan; When scanning filling district, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to scan;
Step 3: repeated execution of steps one and step 2 are until three-dimensional body moulding.
8. the Laser Scanning for the manufacture of three-dimensional body according to claim 7, is characterized in that, adopts same scan spacing to line by line scan to fill area.
9. the Laser Scanning for the manufacture of three-dimensional body according to claim 8, is characterized in that, scanning filling district specifically comprises the following steps:
Control system is calculated according to formula A=W/B and is judged whether A is integer;
When A is integer, control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan to fill area;
When A is non-integer, the integral part of A is denoted as to Z, the 1st to walk to Z capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects larger-size the second hot spot to line by line scan; Z+1 is capable, and control system is controlled laser instrument by galvanometer system, controls beam adjustment system simultaneously, selects the first less hot spot of size to scan;
Wherein, W be in each cross section of product perpendicular to the length of direction of scanning, B is scanning light spot spacing, the line-spacing of described the 1st row equals B, the line-spacing that Z+1 is capable is less than B.
10. according to the Laser Scanning for the manufacture of three-dimensional body described in claim 7-9 any one, it is characterized in that, described Laser Scanning is realized by the laser scanning device described in claim 1-5 any one.
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