CN110549600A - Laser sintering equipment - Google Patents
Laser sintering equipment Download PDFInfo
- Publication number
- CN110549600A CN110549600A CN201810562378.9A CN201810562378A CN110549600A CN 110549600 A CN110549600 A CN 110549600A CN 201810562378 A CN201810562378 A CN 201810562378A CN 110549600 A CN110549600 A CN 110549600A
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- Prior art keywords
- powder
- cylinder body
- spreading
- lower cylinder
- laser sintering
- Prior art date
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- 238000000149 argon plasma sintering Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 194
- 230000007480 spreading Effects 0.000 claims abstract description 70
- 238000003892 spreading Methods 0.000 claims abstract description 70
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 239000000084 colloidal system Substances 0.000 claims description 7
- 238000007639 printing Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000007790 scraping Methods 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 7
- 230000003068 static effect Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000010146 3D printing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 241000500881 Lepisma Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000007779 soft material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- -1 preferably Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/245—Platforms or substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/255—Enclosures for the building material, e.g. powder containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention discloses laser sintering equipment, which belongs to the field of additive manufacturing, and comprises a rack, a cylinder body and a screw-nut pair, and is characterized in that: the cylinder body comprises an upper cylinder body and a lower cylinder body, and the upper cylinder body and the lower cylinder body are connected through a telescopic structure; the screw rod nut pair is positioned at the center of the bottom end outside the lower cylinder body and is consistent with the Z-axis direction of the cylinder body; the outer part of the lower cylinder body is provided with a directional guide rail which supports the cylinder body and enables the lower cylinder body to do lifting motion by matching with the screw nut pair; the powder supplying and spreading mechanism comprises a powder supplying and spreading sleeve and a spiral powder feeding mechanism; compared with the prior art, the scheme adopted by the invention can completely solve the problems of sealing and cleaning, and the scraping and the powder spreading are combined together, so that the powder spreading and the scraping are carried out simultaneously, and the efficiency is improved; adopt spiral powder feeding mechanism to send the powder to the other end from supplying powder cover one end, realize evenly sending the powder, improve and spread powder quality.
Description
Technical Field
The invention relates to the field of additive manufacturing, in particular to laser sintering equipment.
background
in the laser sintering technology, the traditional forming equipment needs to use a workbench, namely, the workbench is processed, and the problem of poor sealing effect is inevitable because a sealing gasket is adopted between the workbench and the wall of the forming cylinder for sealing.
In addition, the forming quality of the part is determined by the powder laying quality to a great extent, if the powder laying quality is not high, the powder laying effect is not good, if the powder contains air holes, the powder is not smooth, and the machined part has the defects of air holes, poor structural property and the like. The powder spreading and leveling method in some prior arts is not satisfactory in implementation effect, for example, after many powder spreading devices spread powder, the powder is distributed unevenly on a workbench, and the leveling is difficult.
disclosure of Invention
Compared with the traditional 3D printing equipment, the lower cylinder body is not provided with a workbench, the bottom of the lower cylinder body is directly used as the workbench, and the lower cylinder body is controlled to move up and down during working, so that the processing can be realized.
In order to achieve the purpose, the invention adopts the technical scheme that: a laser sintering printer comprises a frame 1, an upper cylinder body 2, a lower cylinder body 4, a powder spreading and supplying mechanism 12, a directional guide rail 18, a screw-nut pair 20 and a telescopic structure 3;
The upper cylinder body and the lower cylinder body are connected through the telescopic structure 3, so that the whole forming cylinder is a closed space, the upper cylinder body and the lower cylinder body are fixedly connected with the telescopic structure 3, and preferably, the telescopic structure 3 is embedded in the upper cylinder body and the lower cylinder body;
the screw nut pair 20 is positioned at the center of the bottom end outside the lower cylinder 4 and is consistent with the cylinder Z-axis direction, and two ends of the screw nut pair are respectively fixedly connected with the lower cylinder 4 and the rack 1; a directional guide rail 18 which supports the cylinder body and enables the lower cylinder body 4 to do lifting motion by matching with a screw nut pair 20 is arranged outside the lower cylinder body 4; the directional guide rails 18 are symmetrically arranged outside the lower cylinder 4;
The directional guide rail 18 comprises a sliding block 5 and a static guide rail 6, the static guide rail 6 is fixed on the lower mounting plate of the rack 1 and the rack 1, and preferably, the fixed connection adopts welding; the sliding blocks 5 are symmetrically and fixedly arranged on two sides of the lower cylinder body 4; and is matched with the static guide rail 6, preferably, fixed connection is realized by adopting bolt connection; the directional guide rail 12 is used for ensuring that the lower cylinder body 5 keeps balance in the lifting motion; the bottom end of the lower cylinder body 4 is connected with the lower mounting plate through the screw-nut pair 20; the screw-nut pair 20 comprises a screw 7 and a nut pair 19; the nut pair 19 is controlled to rotate to drive the screw rod 7 to rotate, so that the lower cylinder body 4 is controlled to do lifting motion;
the powder supplying and spreading mechanism 12 comprises a horizontal guide rail 8, a horizontal sliding block 9, a supporting plate 11, an air cylinder 10, a first power device 13, a second power device 17, a powder supplying and spreading sleeve 16 and a spiral powder feeding mechanism 15;
The powder supply and spreading sleeve 16 is a cylindrical ring and is made of soft materials, preferably, the soft materials are silica gel, so that the powder supply and spreading sleeve 16 can cross hard particles when encountering the hard particles or impacting in the working process, and the damage is avoided; a powder outlet sieve 14 is axially arranged at the 1/4 circumference of the powder supply and powder spreading sleeve 16, and the rest 3/4 of the powder supply and powder spreading sleeve 16 is used as a cylindrical slicker in the working process, so that the whole mechanism integrates powder spreading and slicking; the powder outlet sieve 14 is provided with powder outlet holes, and the diameter of each powder outlet hole is 70-120 um; two ends of the spiral powder feeding mechanism 15 are provided with solid rotating shafts, two ends of the powder supply and spreading sleeve 16 are provided with hollow rotating shafts, the spiral powder feeding mechanism 15 is arranged in the powder supply and spreading sleeve 16, and the two are respectively connected with the first power device and the second power device; the powder supplying and spreading sleeve 16 and the spiral powder feeding mechanism 15 are fixedly connected with the mounting plate 16 through the air cylinder 10, and two horizontal guide rails are arranged at two ends above the mounting plate 16 so as to enable the powder supplying and spreading mechanism 12 to move along the horizontal direction.
Furthermore, the diameter of the powder outlet holes on the powder outlet sieve 14 is 100um, the powder outlet holes are randomly distributed on the powder outlet sieve 14, and the number of the powder outlet holes is between 546 and 2300; the clearance between the periphery of the spiral powder feeding mechanism 15 and the inner surface of the powder supplying and spreading sleeve 16 is 0.2 mm.
further, the telescopic structure 3 is made of a telescopic glue, preferably, the telescopic structure 3 comprises 4 pieces of telescopic glue, and is preferably made of PVC material.
Further, the cross section of the telescopic structure 3 is rectangular or circular, the invention is preferably rectangular, and the left end and the right end of each telescopic colloid are respectively fixedly connected with the two telescopic colloids.
Further, the rack 1 comprises an upper mounting plate, a lower mounting plate and a bracket; the support is composed of 4 upright posts and 2 symmetrical cross beams, two ends of each upright post are fixedly connected with the upper mounting plate and the lower mounting plate, and preferably, the fixing mode is welding; the two ends of each cross beam are fixedly connected with the upright posts, preferably, the fixing mode is bolt connection; the two ends of the directional guide rail 18 are fixedly connected with the lower mounting plate and the cross beam respectively, preferably, the fixing mode is bolt connection.
further, the connection position of the orientation guide rail 18 and the lower cylinder 4 is located below the telescopic structure 4, and the slidable distance of the orientation guide rail 18 is adapted to the telescopic distance of the telescopic structure 4.
further, the working method of the laser sintering equipment comprises the following steps:
1) The screw-nut pair 20 controls the lower cylinder body 4 to do lifting movement, when one layer is printed, the lower cylinder body 4 descends one layer, and the upper cylinder body 2 is fixed;
2) When the powder feeding and spreading device works, the external controller controls the powder feeding and spreading mechanism 12 to move along the horizontal direction, and the powder discharging sieve 14 of the powder feeding and spreading sleeve 16 faces upwards; controlling the spiral powder feeding mechanism 15 to rotate, and uniformly feeding powder into the powder feeding and spreading sleeve 16; then controlling the powder supplying and spreading sleeve 16 to rotate 180 degrees, so that the powder discharging sieve 14 is downward, the powder falls onto the workbench under the action of gravity, and simultaneously controlling the powder supplying and spreading mechanism 12 to start to move along the horizontal direction;
3) In the movement process, the powder supply and spreading sleeve 16 and the spiral powder feeding mechanism 15 rotate all the time, the powder discharging sieve 14 of the powder supply and spreading sleeve 16 supplies powder, the rest 3/4 circumferences scrape the powder evenly, and the working process is repeated until the whole working table is fully spread with the powder;
4) In printing, in order to realize redundancy-free powder laying to ensure the powder laying quality, a rectangle needs to be sintered around the powder layer close to the wall of the forming cylinder for each layer of powder laying, and the size of the sintered rectangle needs to be correspondingly adjusted according to the size of a part to be processed so as to ensure that the powder can keep the shape when being impacted and meet the printing requirement.
Compared with the prior art, the invention has the following advantages:
Compared with the traditional 3D printing equipment, the lower cylinder body is provided with no workbench, the bottom of the lower cylinder body is directly used as the workbench, and the lower cylinder body is controlled to do lifting motion during working, so that the processing can be realized; the strickling and the powder spreading are combined together, and the strickling is carried out while the powder spreading is carried out, so that the efficiency is improved; a spiral powder feeding mechanism is adopted to feed powder from one end of the powder feeding and spreading sleeve to the other end, so that uniform powder feeding is realized, and the powder spreading quality is improved; in addition, the problem of powder removal can be solved, and the weight of the whole forming cylinder can be reduced.
drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
fig. 1 is a sectional view of a front view of embodiment 1.
Fig. 2 is a partially enlarged view of the powder supplying and spreading mechanism of embodiment 1.
The corresponding part names indicated by the numbers in the figures:
1. The machine frame 2, the upper cylinder body 3, the telescopic structure 4, the lower cylinder body 5, the slide block 6, the static guide rail 7, the lead screw 8, the horizontal guide rail 9, the horizontal slide block 10, the air cylinder 11, the support plate 12, the powder supply and powder spreading mechanism 13, the first power device 14, the powder outlet sieve 15, the spiral powder feeding mechanism 16, the powder supply and powder spreading sleeve 17, the second power device 18, the directional guide rail 19, the nut pair 20, the lead screw and nut pair 21 and the lower mounting plate
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like refer to orientations or positional relationships based on those shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
example 1: referring to fig. 1 and 2, the laser sintering printer comprises a frame 1, an upper cylinder 2, a lower cylinder 4, a powder spreading and supplying mechanism 12, a directional guide rail 18, a screw-nut pair 20 and a telescopic structure 3.
in this embodiment, the upper and lower cylinders are fixedly connected to the telescopic structure 3 in an embedded manner, so that the whole forming cylinder is a closed space; the screw nut pair 20 is positioned at the center of the bottom end outside the lower cylinder body 4 and is consistent with the cylinder body in the Z-axis direction; the exterior of the lower cylinder body 4 is provided with a directional guide rail 18 which supports the cylinder body and enables the lower cylinder body 4 to do lifting movement by matching with a lead screw nut pair 20.
The directional guide rail 18 comprises a sliding block 5 and a static guide rail 6, and the static guide rail 6 is fixed on a lower mounting plate 21 of the rack 1 in a welding mode; the slide block 5 passes through a bolt; the connection mode is arranged on two sides of the lower cylinder body 4; the directional guide rail 18 is used for ensuring that the lower cylinder body 4 keeps balance in the lifting motion; the bottom end of the lower cylinder body 4 is connected with the lower mounting plate 21 through the screw-nut pair 20.
The screw-nut pair 20 comprises a screw 7 and a nut pair 19; the control nut pair 19 rotates to drive the screw rod 7 to rotate, and then the lower cylinder body 4 is controlled to do lifting motion.
The powder supply and spreading sleeve 16 is a cylindrical ring and is made of silica gel, so that the powder supply and spreading sleeve 16 can cross over hard particles when encountering the hard particles or impacting in the working process, and the damage is avoided; a powder outlet sieve 14 is axially arranged at the 1/4 circumference of the powder supply and powder spreading sleeve 16, and the rest 3/4 of the powder supply and powder spreading sleeve 16 is used as a cylindrical slicker in the working process, so that the whole mechanism integrates powder spreading and slicking; the powder outlet sieve 14 is provided with a powder outlet hole, and the diameter of the powder outlet hole is 100 um; two ends of the spiral powder feeding mechanism 15 are provided with solid rotating shafts in a welding mode, two ends of the powder supply and spreading sleeve 16 are provided with hollow rotating shafts in a welding mode, the spiral powder feeding mechanism 15 is sleeved in the powder supply and spreading sleeve 16 through the rotating shafts, and the spiral powder feeding mechanism and the powder supply and spreading sleeve are respectively connected with the first power device and the second power device through couplers; powder supplying and spreading sleeve 16 and spiral powder feeding mechanism 15 are fixedly connected with mounting plate 16 through cylinder 10, two horizontal guide rails are arranged at two ends above mounting plate 16, and the two horizontal guide rails are fixedly connected through bolts, so that powder supplying and spreading mechanism 12 moves along the horizontal direction.
the diameter of the powder outlet holes in the powder outlet sieve 14 is 100um, the powder outlet holes are randomly distributed on the powder outlet sieve 14, and the number of the powder outlet holes is 2286; the clearance between the periphery of the spiral powder feeding mechanism 15 and the inner surface of the powder supplying and spreading sleeve 16 is 0.2 mm.
The telescopic structure 3 is composed of 4 telescopic colloids, and is made of PVC materials.
The cross section of the telescopic structure 3 is rectangular, and the left end and the right end of each telescopic colloid are fixedly connected with the two telescopic colloids respectively.
The rack 1 comprises an upper mounting plate, a lower mounting plate and a bracket; the support is composed of 4 upright posts and 2 symmetrical cross beams, two ends of each upright post are fixedly connected with the upper mounting plate and the lower mounting plate in a welding mode; two ends of each cross beam are fixedly connected with the stand columns in a bolt connection mode; two ends of the directional guide rail 18 are respectively fixedly connected with the lower mounting plate and the cross beam in a bolt connection mode.
In this embodiment, the connection between the directional guide rail 18 and the lower cylinder 4 is located below the telescopic structure 4, and the slidable distance of the directional guide rail 18 is adapted to the telescopic distance of the telescopic structure 4.
The working mode of the invention is as follows:
a) The lower cylinder body and the workbench descend one layer when the lower cylinder body and the workbench are printed one layer, and the upper cylinder body is fixed;
b) when the powder feeding and spreading device works, the external controller controls the powder feeding and spreading mechanism to move towards the workbench, and the powder discharging sieve of the powder feeding and spreading sleeve faces upwards; controlling the spiral powder feeding mechanism to rotate, and uniformly feeding powder into the powder feeding and spreading sleeve; then controlling the powder supplying and spreading sleeve to rotate 180 degrees, so that the powder discharging sieve faces downwards, the powder falls onto the workbench under the action of gravity, and simultaneously controlling the powder supplying and spreading mechanism to start to move along the workbench;
c) In the movement process, the powder supply and spreading sleeve and the spiral powder feeding mechanism rotate all the time, the powder discharging sieve of the powder supply and spreading sleeve supplies powder, the rest 3/4 circumferences scrape the powder evenly, and the working process is repeated until the whole workbench is fully spread with the powder;
d) in printing, in order to realize redundancy-free powder laying to ensure the powder laying quality, a rectangle needs to be sintered around the powder layer close to the wall of the forming cylinder for each layer of powder laying, and the size of the sintered rectangle needs to be correspondingly adjusted according to the size of a part to be processed so as to ensure that the powder can keep the shape when being impacted and meet the printing requirement.
Example 3:
this embodiment differs from embodiment 1 only in that the diameter of the powder outlet holes on the powder outlet sieve is 70um, which is designed to be adaptable to the particle size of the powder, and if the particle size of the powder is below 70um, the powder outlet sieve will filter the powder with a diameter larger than 70um, because in 3D printing, the diameter of the powder with an unsatisfactory diameter will reduce the printing quality.
The operation and other structures and connection modes of the present embodiment are the same as those of embodiment 1.
Example 4:
This example differs from example 1 only in that the diameter of the powder outlet holes in the powder outlet sieve is 120um, which is consistent with the purpose described in example 3, i.e. if the particle size of the powder is below 120um, the powder outlet sieve will filter powder with a diameter larger than 120um, since in 3D printing the diameter of the powder with an unsatisfactory diameter will reduce the print quality.
The operation and other structures and connection modes of the present embodiment are the same as those of embodiment 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a laser sintering equipment, includes frame (1), cylinder (10), horizontal guide (8), cylinder body, screw nut pair (20), its characterized in that: the cylinder body comprises an upper cylinder body (2) and a lower cylinder body (4), and the upper cylinder body and the lower cylinder body are fixedly connected with the telescopic cylinder body (3); and forms a sealed cavity together with the upper and lower cylinders;
The screw-nut pair (20) is positioned at the center of the bottom end outside the lower cylinder body (4) and is consistent with the cylinder body in the Z-axis direction; a directional guide rail (18) which supports the cylinder body and enables the lower cylinder body (4) to do lifting motion by matching with a screw nut pair (20) is arranged outside the lower cylinder body (4);
The powder supplying and spreading mechanism (12) comprises a powder supplying and spreading sleeve (16) and a spiral powder feeding mechanism (15);
The powder supply and spreading sleeve (16) is a cylindrical ring, and a powder outlet sieve (14) is arranged at the 1/4 circumference of the powder supply and spreading sleeve (16) along the long axis direction; the powder outlet sieve (14) is provided with powder outlet holes, and the diameter of each powder outlet hole is 70-120 um;
solid rotating shafts are arranged at two ends of the spiral powder feeding mechanism (15), hollow rotating shafts are arranged at two ends of the powder supplying and spreading sleeve (16), and the spiral powder feeding mechanism (15) is arranged in the powder supplying and spreading sleeve (16); the two are respectively connected with a power device; and two ends of the air cylinder (10) are respectively connected with the powder supply and spreading sleeve (16) and the horizontal guide rail (8).
2. The laser sintering apparatus of claim 1, wherein: the diameter of the powder outlet holes in the powder outlet sieve (14) is 100um, the powder outlet holes are randomly distributed on the powder outlet sieve (14), and the number of the powder outlet holes is between 546 and 2300; the clearance between the periphery of the spiral powder feeding mechanism (15) and the inner surface of the powder supplying and spreading sleeve (16) is 0.2 mm.
3. The laser sintering printer of claim 1, wherein: the telescopic structure (3) is colloid.
4. The laser sintering printer of claim 1, wherein: the colloid is made of PVC material.
5. the laser sintering apparatus of claim 1, wherein: the section of the telescopic structure (3) is rectangular or circular.
6. The laser sintering apparatus of claim 1, wherein: the rack (1) comprises an upper mounting plate, a lower mounting plate and a bracket; the support is composed of 4 upright posts and 2 symmetrical cross beams, and two ends of each upright post are fixedly connected with the upper mounting plate and the lower mounting plate; the two ends of each beam are fixedly connected with the upright columns, and the two ends of the directional guide rail (18) are respectively fixedly connected with the lower mounting plate and the beams.
7. The laser sintering apparatus of claim 1, wherein: the joint of the directional guide rail (18) and the lower cylinder body (4) is positioned below the telescopic structure (3), and the slidable distance of the directional guide rail (18) is adapted to the telescopic distance of the telescopic structure (3).
8. the laser sintering apparatus of claim 1, wherein: the working method of the laser sintering equipment comprises the following steps:
a) The screw-nut pair (20) controls the lower cylinder body (4) to do lifting movement, when one layer is printed, the lower cylinder body (4) descends one layer, and the upper cylinder body (2) is fixed;
b) When the powder feeding and spreading device works, the external controller controls the powder feeding and spreading mechanism (12) to move along the horizontal direction, and the powder discharging sieve (14) of the powder feeding and spreading sleeve (16) faces upwards; controlling the spiral powder feeding mechanism (15) to rotate, and uniformly feeding powder into the powder feeding and spreading sleeve (16); then controlling the powder supply and spreading sleeve (16) to rotate 180 degrees, so that the powder outlet sieve (14) is downward, the powder falls onto a workbench under the action of gravity, and simultaneously controlling the powder supply and spreading mechanism (12) to start to move along the horizontal direction;
c) In the movement process, the powder supplying and spreading sleeve (16) and the spiral powder feeding mechanism (15) rotate all the time, the powder discharging sieve (14) of the powder supplying and spreading sleeve (16) supplies powder, the rest 3/4 circumferences scrape the powder evenly, and the working process is repeated until the whole workbench is fully spread with the powder;
d) In printing, in order to realize redundancy-free powder laying to ensure the powder laying quality, a rectangle needs to be sintered around the powder layer close to the wall of the forming cylinder for each layer of powder laying, and the size of the sintered rectangle needs to be correspondingly adjusted according to the size of a part to be processed so as to ensure that the powder can keep the shape when being impacted and meet the printing requirement.
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| CN201810562378.9A CN110549600B (en) | 2018-06-04 | 2018-06-04 | Laser sintering equipment |
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| CN201810562378.9A CN110549600B (en) | 2018-06-04 | 2018-06-04 | Laser sintering equipment |
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| CN110549600A true CN110549600A (en) | 2019-12-10 |
| CN110549600B CN110549600B (en) | 2022-04-22 |
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Citations (5)
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| CN105538725A (en) * | 2016-02-17 | 2016-05-04 | 李全贵 | Laser forming machine |
| CN105562687A (en) * | 2014-10-10 | 2016-05-11 | 南京理工大学 | Selective laser melting powder sending and laying device used for compounding of different types of powder |
| CN206140936U (en) * | 2016-10-10 | 2017-05-03 | 深圳市圆梦精密技术研究院 | Sealing device and three -dimensional inkjet printer |
| DE102016211214A1 (en) * | 2016-06-23 | 2017-12-28 | Trumpf Laser- Und Systemtechnik Gmbh | Construction cylinder arrangement for a machine for the layered production of three-dimensional objects, with fiber metal seal |
| CN107867400A (en) * | 2017-12-19 | 2018-04-03 | 浙江大学 | The fog machine liquid case that a kind of automatic anti-earthquake swings |
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2018
- 2018-06-04 CN CN201810562378.9A patent/CN110549600B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562687A (en) * | 2014-10-10 | 2016-05-11 | 南京理工大学 | Selective laser melting powder sending and laying device used for compounding of different types of powder |
| CN105538725A (en) * | 2016-02-17 | 2016-05-04 | 李全贵 | Laser forming machine |
| DE102016211214A1 (en) * | 2016-06-23 | 2017-12-28 | Trumpf Laser- Und Systemtechnik Gmbh | Construction cylinder arrangement for a machine for the layered production of three-dimensional objects, with fiber metal seal |
| CN206140936U (en) * | 2016-10-10 | 2017-05-03 | 深圳市圆梦精密技术研究院 | Sealing device and three -dimensional inkjet printer |
| CN107867400A (en) * | 2017-12-19 | 2018-04-03 | 浙江大学 | The fog machine liquid case that a kind of automatic anti-earthquake swings |
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