CN112172146A - Collision type powder conveying and spreading device and powder conveying and spreading control method thereof - Google Patents
Collision type powder conveying and spreading device and powder conveying and spreading control method thereof Download PDFInfo
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- CN112172146A CN112172146A CN202010891198.2A CN202010891198A CN112172146A CN 112172146 A CN112172146 A CN 112172146A CN 202010891198 A CN202010891198 A CN 202010891198A CN 112172146 A CN112172146 A CN 112172146A
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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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
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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
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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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
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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
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
- B29C64/329—Feeding using hoppers
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- 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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
A collision type powder feeding and spreading device and a powder feeding and spreading control method thereof are provided, wherein the powder feeding and spreading device comprises: store up the powder groove, the mount pad, picture peg and scraper mechanism, the mount pad includes first, second panel and first through-hole, be equipped with on the first panel with store up the communicating second through-hole of powder mouth in powder groove, be equipped with at least one third through-hole on the second panel, the four corners of picture peg is connected with the collision pole through the driving arm respectively, send the in-process of spreading powder device round trip movement in the working area, when collision pole and arbitrary inner wall collision of working chamber, make mount pad and picture peg take place relative motion, thereby realize that the powder that stores up in the powder groove falls into the fourth through-hole through the second through-hole, and/or the powder that falls into the fourth through-hole falls into one side that is close to the shop's powder initial position of scraper mechanism through the third through-hole. The invention reduces the complexity of the powder feeding structure to the maximum extent, reduces the use of power equipment, bearing sealing elements and the like, reduces the cost, and simultaneously increases the safety and the reliability in use.
Description
Technical Field
The invention relates to the technical field of three-dimensional object manufacturing, in particular to a collision type powder conveying and spreading device and a powder conveying and spreading control method thereof.
Background
The laser sintering process as one of additive manufacturing technologies comprises the following basic processes: the equipment adds or carries the powder into and supplies the powder case before printing or in-process, supply the powder in the powder case to send a certain amount of powder to table surface through certain powder feeding device, powder on the table surface is evenly spread on the sintering plane through scraper or shop's powder roller again, the powder of work piece cross-section profile part on the sintering plane is directly sintered or is preheated the back and is sintered through the laser by the mirror control of shaking, after one deck cross-section sintering is accomplished, the workstation descends the thickness of a layer, carry out the powder of above-mentioned again, shop's powder, laser sintering process, through this kind of layer sintering printing back, the work piece is just made out, the additive manufacturing of whole work piece has been accomplished, 3D printing process.
In the above-mentioned technology, the powder feeding device is an indispensable link in 3D printing of powder, and is mainly divided into two types, a lower powder feeding device and an upper powder feeding device, by the powder feeding box arrangement position. The lower powder feeding device is mainly used for molding small size without considering equipment for adding powder in the middle; the upper powder feeding device can be used for equipment with various molding sizes, is flexible in powder supply and wide in use, and has a more complex structure and higher requirement on sealing reliability.
Disclosure of Invention
Based on the above, the invention provides the collision type powder conveying and spreading device with a pure mechanical structure, simple and reliable action and low cost and the powder conveying and spreading control method thereof.
In order to achieve the above object, the present invention provides a collision type powder feeding and spreading device, comprising: a powder storage groove, a mounting seat arranged below the powder storage groove, an inserting plate with at least one fourth through hole, and a scraper mechanism arranged below the mounting seat, wherein the mounting seat comprises a first panel and a second panel, and a first through hole between the first panel and the second panel, the insert plate being slidably disposed in the first through hole, the first panel is provided with a second through hole communicated with the powder outlet of the powder storage groove, the second panel is provided with at least one third through hole, four corners of the inserting plate are respectively connected with collision rods through transmission arms, in the process that the powder feeding and spreading device moves back and forth in a working area, when the collision rod collides with any inner wall of the working cavity, the mounting seat and the inserting plate move relatively, thereby realize that the powder in the powder storage tank falls into the fourth through-hole through the second through-hole, and/or the powder that falls into in the fourth through-hole falls into one side that is close to shop's powder initial position of scraper mechanism through the third through-hole.
As a further preferable scheme of the present invention, one or two third through holes are provided on the second panel, and the second through holes and the third through holes are arranged in a staggered manner.
As a further preferable aspect of the present invention, the insert plate has one or two fourth through holes.
As a further preferable scheme of the present invention, the mounting seat is formed by splicing a first panel and a second panel, the first panel is U-shaped, and the second panel is flat; or the first panel is L-shaped, and the second panel is L-shaped.
As a further preferable scheme of the invention, the inserting plate is in sliding fit with the first panel and the second panel respectively, and the top surface of the middle part of the inserting plate, which is parallel to the upper surface and the lower surface of the first panel or the second panel, is 0.1-0.15mm lower than the top surfaces of the two sides.
As a further preferable scheme of the invention, at least two guide mechanisms are respectively arranged on two side edges of the inserting plate parallel to the moving direction of the inserting plate.
As a further preferable embodiment of the present invention, each corner of the insert plate has two protruding columns spaced apart by a predetermined distance, the insert plate is connected to one end of the driving arm by respectively providing bolts on the two protruding columns, and the other end of the driving arm is connected to the collision bar.
In a further preferred embodiment of the present invention, an elastic member is provided in the impact beam.
As a further preferable scheme of the invention, when the powder feeding and spreading device is used for one-way powder feeding and spreading, when the collision rod collides with the inner wall of one side of the working cavity far away from the powder spreading initial position, the relative motion of the mounting seat and the inserting plate enables the powder in the powder storage tank to fall into the fourth through hole through the second through hole; when the collision rod collides with the inner wall of one side of the working cavity close to the powder spreading initial position, the relative motion of the mounting seat and the inserting plate enables the powder falling into the fourth through hole to fall into one side of the scraper mechanism close to the powder spreading initial position through the third through hole;
when the powder conveying and spreading device is used for bidirectionally conveying and spreading powder, when the collision rod collides with any inner wall of the working cavity, the mounting seat and the inserting plate move relatively, so that the powder in the powder storage groove falls into the fourth through hole through the second through hole, and the powder falling into the fourth through hole falls into one side, close to the powder spreading initial position, of the scraper mechanism through the third through hole, so that the scraper mechanism spreads the powder to a working area.
The invention also provides a powder feeding and spreading control method of the collision type powder feeding and spreading device, which comprises the following steps: in the process that the powder conveying and spreading device moves back and forth in the working area, when the collision rod collides with any inner wall of the working cavity, the powder conveying and spreading device moves at a first preset speed; when the collision pole is not collided with any inner wall of working chamber, send and spread the powder device and remove with the speed that the second was preset, first speed of presetting is less than the speed that the second was preset, just first speed of presetting can be adjusted according to the powder mobility in the powder storage tank.
The collision type powder conveying and spreading device has the following beneficial effects by adopting the technical scheme:
1. the invention meets the requirement of powder feeding and spreading functions, simultaneously reduces the complexity of a powder feeding structure to the maximum extent, reduces the use of power equipment, bearing sealing elements and the like, reduces the cost, and simultaneously increases the safety and reliability in use;
2. the powder feeding is realized by the movement of the inserting plate, and meanwhile, the moving power of the inserting plate comes from the translational motion during powder paving, so that the powder feeding action can be executed in an unpowered manner, and meanwhile, the powder feeding amount can be adjusted through the size of a fourth through hole of the inserting plate;
3. according to the powder feeding and spreading structure, the powder in the powder storage tank is firstly dropped to the fourth through hole through the movement of the inserting plate, then the powder in the fourth through hole is dropped to one side, close to the powder spreading starting position, of the scraper mechanism, and the powder feeding amount of each layer is borne through the fourth through hole of the inserting plate (for example, the powder in the fourth through hole cannot be continuously filled after being filled), so that compared with the traditional valve type powder feeding, the powder feeding and spreading structure enables the powder feeding amount to be more accurate.
The invention discloses a powder feeding and spreading control method of a collision type powder feeding and spreading device, which comprises the following steps: in the process that the powder conveying and spreading device moves back and forth in the working area, when the collision rod collides with any inner wall of the working cavity, the powder conveying and spreading device moves at a first preset speed; when the collision rod does not collide with any inner wall of the working cavity, the powder conveying and spreading device moves at a second preset speed, the first preset speed is lower than the second preset speed, and the first preset speed can be adjusted according to the powder flowability in the powder storage tank, so that the method avoids the defects that the traditional powder conveying and spreading mode adopts the same moving speed and is difficult to combine high working efficiency and accurate powder conveying amount, the powder feeding and spreading method of the invention not only can set a proper first preset speed according to the powder fluidity in the powder storage tank, and adopt the second that is far greater than first predetermined speed to predetermine the speed and carry out the fast travel when the collision, that is to say can guarantee the efficiency of spreading of the full stroke of spreading powder basically, can guarantee the smoothness nature of powder and sufficient whereabouts powder volume again, avoid appearing lacking powder or few powder phenomenon, guaranteed the stability and the reliability of work promptly.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the impact powder feeder of the present invention;
FIG. 2 is an assembly view of the powder reservoir, mounting base and receptacle of FIG. 1;
FIG. 3 is a cross-sectional view of another embodiment of the impact powder feeder of the present invention;
FIG. 4 is a cross-sectional view of a second embodiment of the impact powder feeder of the present invention;
FIG. 5 is a schematic view of a double slot insert plate;
FIG. 6 is a schematic view of a single slot insert plate;
fig. 7 is a schematic view of the structure of the impact beam.
Reference numbers in the figures: 1. a powder storage tank; 11. a high material level switch; 12. a low level switch; 2. a first panel; 21. a second through hole; 3. inserting plates; 31. a fourth via hole; 32. a convex column; 4. a second panel; 41. a third through hole; 5. a collision bar; 6. a powder falling channel; 7. a dust-proof cover plate; 8. a scraper mechanism; 9. a spring.
Detailed Description
In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to achieve the above object, the present invention provides a collision type powder feeding and spreading device, comprising: the powder storage groove 1, the mounting seat arranged under the powder storage groove 1, the inserting plate 3 with at least one fourth through hole 31 and the scraper mechanism 8 arranged below the mounting seat, wherein the mounting seat comprises a first panel 2, a second panel 4 and a first through hole arranged between the first panel 2 and the second panel 4, the inserting plate 3 is slidably arranged in the first through hole, the first panel 2 is provided with a second through hole 21 communicated with a powder outlet of the powder storage groove 1, the second panel 4 is provided with at least one third through hole 41, four corners of the inserting plate 3 are respectively connected with collision rods 5 through transmission arms, in the process that the powder conveying and spreading device moves back and forth in a working area, when the collision rods 5 collide with any inner wall of a working cavity, the mounting seat and the inserting plate 3 move relatively, so that powder in the powder storage groove 1 falls into the fourth through hole 31 through the second through hole 21, and/or the powder falling into the fourth through-hole 31 falls into the side of the scraper mechanism 8 near the powder laying start position through the third through-hole 41.
One or two third through holes 41 are formed in the second panel 4, and specifically, the number of the third through holes 41 can be determined according to design requirements and when a bidirectional powder spreading mode is adopted, as shown in fig. 1 to 4, the number of the third through holes 41 is two. Preferably, the second through hole 21 and the third through hole 41 are arranged in a staggered manner, so that the powder in the powder storage tank 1 cannot directly fall to one side, close to the powder paving starting position, of the scraper mechanism 8, but the powder in the powder storage tank 1 firstly falls to the fourth through hole 31, and then the powder in the fourth through hole 31 falls to one side, close to the powder paving starting position, of the scraper mechanism 8, so that the powder feeding amount of each layer, namely the powder feeding amount, can be borne through the fourth through hole 31 of the inserting plate 3 more accurately.
Specifically, the insert plate 3 has one or two fourth through holes 31, and the insert plate 3 shown in fig. 5 has two fourth through holes 31; while the insert plate 3 shown in figure 6 has a fourth through hole 31. The doctor mechanism includes a doctor blade and a pressing plate for fixing the doctor blade, etc., which are not described in detail in the present invention since they are prior art.
Preferably, in order to facilitate the assembly of the device and reduce the manufacturing cost of the device, the mounting base is formed by splicing a first panel 2 and a second panel 4, the first panel 2 is U-shaped, and the second panel 4 is flat; or the first panel 2 is L-shaped and the second panel 4 is L-shaped. The inserting plate 3 is in sliding fit with the first panel 2 and the second panel 4 respectively. Further preferably, in order to ensure that the insert plate 3 slides more smoothly as much as possible on the premise that the insert plate 3 slides stably with the first panel 2 and the second panel 4, a middle top surface of the insert plate 3 parallel to the upper and lower surfaces of the first panel 2 or the second panel 4 is slightly lower than top surfaces of the two sides, and a specific value can be obtained according to experiments, for example, can be lower than 0.1-0.15 mm.
As a further preferable scheme of the present invention, at least two guiding mechanisms are respectively arranged on two side edges of the inserting plate 3 parallel to the moving direction of the inserting plate 3, and are used for guiding the sliding of the inserting plate 3.
Preferably, as shown in fig. 5 and 6, each corner of the insert plate 3 has two protruding columns 32 spaced apart by a predetermined distance, and the insert plate 3 is connected to one end of a driving arm by respectively providing bolts on the two protruding columns 32, and the other end of the driving arm is connected to the collision bar 5. The preset distance can be specifically set by a designer, so that the powder brought out by the inserting plate 3 in the moving process flows down through the gap between the two convex columns 32, and powder accumulation is avoided.
In order to avoid too much vibration caused by the collision when the collision bar 5 collides with any inner wall of the working chamber and reduce the impact force of the movement of the insert plate 3, it is preferable that, as shown in fig. 7, the collision bar 5 is provided with an elastic member therein, which may be a spring 9. The length of the collision rod 5 can be specifically set according to needs, for example, the length of the collision rod 5 can be specifically set according to the two-pole position of the powder feeding and spreading device and the size of the internal space of the equipment, so that the powder feeding and spreading device can start to collide before the two-pole position (namely the lower front collision starting position and the lower rear collision starting position).
Preferably, one side or both sides that are close to the shop's powder initial position of scraper mechanism 8 are equipped with the whitewashed passageway 6 that falls to be used for communicating with third through hole 41, send the shop's powder device still including being used for covering scraper mechanism 8 and the dustproof apron 7 of whitewashed passageway 6 that falls, whitewashed passageway 6 that falls and dustproof apron 7 can be used to reduce the production of raise dust and the side laying powder when the height of falling powder is higher.
As shown in fig. 1, a high material level switch 11 and a low material level switch 12 are sequentially arranged on the powder storage tank 1 from top to bottom, so that when the powder stored in the powder storage tank 1 and conveyed by the external powder supply tank is lower than the low material level switch 12, information is sent to the control system to control the external powder supply tank to convey the powder to the powder storage tank 1, and when the powder in the powder storage tank 1 reaches the high material level switch 11, information is sent to the control system to stop the external powder supply tank from conveying the powder to the powder storage tank 1, so as to realize automatic conveying of the powder. The powder stored in the powder storage tank 1 can ensure the powder supply requirement of several to dozens of layers of powder of the workpiece to be printed.
It should be noted that the second through hole 21, the third through hole 41 and the fourth through hole 31 are all elongated shapes, and may be completely open holes or incompletely open holes, that is, a plurality of through holes are formed, and adjacent through holes are connected by a reinforcing rib.
The collision type powder conveying and spreading device is suitable for unidirectional powder conveying and bidirectional powder conveying and spreading, namely, the number of the fourth through holes formed in the inserting plate 3 and the number of the third through holes 41 formed in the second panel 4 can be reasonably designed according to the requirements of unidirectional and bidirectional powder conveying and spreading. Specifically, when the powder feeding and spreading device is used for one-way powder feeding and spreading, when the collision rod 5 collides with the inner wall of one side of the working cavity far away from the powder spreading initial position, the relative motion of the mounting seat and the inserting plate 3 enables the powder in the powder storage tank 1 to fall into the fourth through hole 31 through the second through hole 21; when the collision rod 5 collides with the inner wall of the working cavity at the side close to the powder laying initial position, the relative movement of the mounting seat and the inserting plate 3 enables the powder falling into the fourth through hole 31 to fall into the side of the scraper mechanism 8 close to the powder laying initial position through the third through hole 41;
when the powder conveying and spreading device is used for bidirectional powder conveying and spreading, when the collision rod 5 collides with any inner wall of the working cavity, the mounting seat and the inserting plate 3 move relatively, so that the powder in the powder storage tank 1 falls into the fourth through hole 31 through the second through hole 21, and the powder falling into the fourth through hole 31 falls into one side, close to the powder spreading initial position, of the scraper mechanism 8 through the third through hole 41, so that the scraper mechanism 8 spreads the powder to the working area. FIG. 3 is a view showing a state where the inserting plate 3 collides at the left side and powder falls from the right side; fig. 4 shows a state where the right side of the plate 3 collides and powder falls from the left side.
It should be noted that, regardless of the unidirectional powder feeding and spreading or the bidirectional powder feeding and spreading, the powder in the powder tank falls into the fourth through hole 31 through the second through hole 21, and the powder falling into the fourth through hole 31 falls into the side of the scraper mechanism 8 close to the powder spreading start position through the third through hole 41, may be completed in the collision process (also referred to as dynamic powder feeding), or may be completed after the collision is completed (also referred to as static powder feeding). Of course, the static powder feeding is preferably adopted, so that the problem that the powder is lack due to different falling powder amounts caused by different powder types when the speed of the inserting plate 3 is constant and the flowability of the powder is different is avoided, that is, the static powder feeding further ensures the accuracy of the powder feeding amount, and the powder feeding and spreading device generally needs to stop waiting after collision so as to continuously move after scanning is finished, so that the process can have time for the powder to fall and is not influenced by the moving speed.
The invention also provides a powder feeding and spreading control method of the collision type powder feeding and spreading device, which comprises the following steps: in the process that the powder conveying and spreading device moves back and forth in the working area, when the collision rod 5 collides with any inner wall of the working cavity, the powder conveying and spreading device moves at a first preset speed; when the collision rod 5 does not collide with any inner wall of the working cavity, the powder conveying and spreading device moves at a second preset speed, the first preset speed is smaller than the second preset speed, and the first preset speed can be adjusted according to the powder flowability in the powder storage groove 1. The first preset speed may be specifically calculated according to the powder feeding amount of each layer and the powder flowability, and preferably, the second preset speed is much greater than the first preset speed, and a specific numerical value is specifically calculated according to the length of the working area and the scanning time, which will not be described in detail herein.
In order to make those skilled in the art better understand and implement the technical solution of the present invention, the following describes the technical solution of the present invention in detail by taking bidirectional powder feeding and spreading as an example.
1) The powder conveying and spreading device is located at the rear limit position of powder spreading, when the powder conveying and spreading device starts to spread powder, the working platform of the forming cylinder descends by one layer thickness, and the powder conveying and spreading device moves from the rear limit position to the front limit position at the speed of 80 mm/s to spread powder. When the powder feeding and spreading device moves to a front collision starting position (namely, the collision rod 5 collides with an inner wall of the working cavity), the spread powder arrives, laser starts to sinter and print a workpiece, meanwhile, the moving speed of the powder feeding and spreading device is changed to 15 mm/s, at the moment, under the movement of the inserting plate 3, the inserting plate 3 and the mounting seat move relatively, as shown in fig. 4, powder in the powder storage groove 1 falls into a plurality of fourth through holes 31 through the second through holes 21, and the powder falling into the plurality of fourth through holes 31 falls into one side, close to the powder spreading starting position, of the scraper mechanism 8 through the third through holes 41 and the powder falling channel 6 so as to finish the powder feeding amount of a next layer.
2) The powder conveying and spreading device is located at a front limit position of powder spreading, when the powder conveying and spreading device starts to spread powder, the working platform of the forming cylinder descends by one layer thickness, and the powder conveying and spreading device moves from the front limit position to a rear limit position according to a preset powder spreading speed to spread powder. When the powder feeding and spreading device moves to the rear collision starting position (namely, the collision rod 5 collides with the other inner wall of the working cavity), the spread powder arrives, the laser starts to sinter and print the workpiece, meanwhile, the moving speed of the powder feeding and spreading device is changed to 15 mm/s, at the moment, under the movement of the inserting plate 3, the inserting plate 3 and the mounting seat perform relative motion, as shown in fig. 3, the powder in the powder storage groove 1 falls into a plurality of fourth through holes 31 through the second through holes 21, and the powder falling into the fourth through holes 31 falls into one side, close to the powder spreading starting position, of the scraper mechanism 8 through the third through holes 41 and the powder falling channel 6 so as to finish the powder feeding amount of the next layer.
3) The powder feeding and spreading device is located at the limit position after powder spreading, and when powder spreading is started, the powder discharging action of 1) 2) is repeated.
It should be noted that, for convenience of describing the circulating step of the powder feeding and spreading of the present invention, the initial state of the powder feeding and spreading device in the step 1) is, by default, that a collision has occurred, that is, a layer of powder has fallen by colliding with the side of the scraper mechanism 8 close to the powder spreading start position. In addition, the collision type powder conveying and spreading device of the invention can move back and forth in the working area under the driving of the driving mechanism to realize the powder conveying and spreading work, and the specific way of driving the collision type powder conveying and spreading device by the driving mechanism belongs to the prior art in the field, so the collision type powder conveying and spreading device is not elaborated in detail in the invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a powder device is spread in sending of collision formula which characterized in that includes: a powder storage groove, a mounting seat arranged below the powder storage groove, an inserting plate with at least one fourth through hole, and a scraper mechanism arranged below the mounting seat, wherein the mounting seat comprises a first panel and a second panel, and a first through hole between the first panel and the second panel, the insert plate being slidably disposed in the first through hole, the first panel is provided with a second through hole communicated with the powder outlet of the powder storage groove, the second panel is provided with at least one third through hole, four corners of the inserting plate are respectively connected with collision rods through transmission arms, in the process that the powder feeding and spreading device moves back and forth in a working area, when the collision rod collides with any inner wall of the working cavity, the mounting seat and the inserting plate move relatively, thereby realize that the powder in the powder storage tank falls into the fourth through-hole through the second through-hole, and/or the powder that falls into in the fourth through-hole falls into one side that is close to shop's powder initial position of scraper mechanism through the third through-hole.
2. The impact powder conveying and spreading device as claimed in claim 1, wherein one or two third through holes are provided on the second panel, and the second through holes and the third through holes are arranged in a staggered manner.
3. The impact powder feeder according to claim 1, wherein the insert plate has one or two fourth through holes.
4. The impact powder feeder according to claim 1, wherein the mounting base is formed by splicing a first panel and a second panel, the first panel is U-shaped, and the second panel is flat; or the first panel is L-shaped, and the second panel is L-shaped.
5. The impact powder feeder according to claim 4, wherein the insert plate is slidably engaged with the first panel and the second panel, respectively, and a top surface of a middle portion of the insert plate, which is parallel to the upper and lower surfaces of the first panel or the second panel, is lower than top surfaces of both sides by 0.1 to 0.15 mm.
6. The impact powder feeder according to claim 1, wherein at least two guiding mechanisms are provided on each of two sides of the insert plate parallel to the direction of movement of the insert plate.
7. The impact powder feeder according to claim 1, wherein each corner of the inserting plate has two protruding columns spaced apart by a predetermined distance, the inserting plate is connected to one end of the driving arm by means of bolts respectively provided to the two protruding columns, and the other end of the driving arm is connected to the impact rod.
8. The impact powder delivery and placement device as recited in claim 1, wherein the impact bar has an elastic member disposed therein.
9. The collision type powder conveying and spreading device as claimed in any one of claims 1 to 8, wherein when the powder conveying and spreading device is used for one-way powder conveying and spreading, when the collision rod collides with the inner wall of one side of the working cavity far away from the powder spreading starting position, the relative movement of the mounting seat and the inserting plate enables the powder in the powder storage tank to fall into the fourth through hole through the second through hole; when the collision rod collides with the inner wall of one side of the working cavity close to the powder spreading initial position, the relative motion of the mounting seat and the inserting plate enables the powder falling into the fourth through hole to fall into one side of the scraper mechanism close to the powder spreading initial position through the third through hole;
when the powder conveying and spreading device is used for bidirectionally conveying and spreading powder, when the collision rod collides with any inner wall of the working cavity, the mounting seat and the inserting plate move relatively, so that the powder in the powder storage groove falls into the fourth through hole through the second through hole, and the powder falling into the fourth through hole falls into one side, close to the powder spreading initial position, of the scraper mechanism through the third through hole, so that the scraper mechanism spreads the powder to a working area.
10. A method for controlling the feeding and spreading of the collision type powder feeding and spreading device according to any one of claims 1 to 9, wherein the powder feeding and spreading device moves at a first preset speed when the collision bar collides with any inner wall of the working chamber during the reciprocating movement of the powder feeding and spreading device in the working area; when the collision pole is not collided with any inner wall of working chamber, send and spread the powder device and remove with the speed that the second was preset, first speed of presetting is less than the speed that the second was preset, just first speed of presetting can be adjusted according to the powder mobility in the powder storage tank.
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| CN113059195A (en) * | 2021-06-03 | 2021-07-02 | 西安赛隆金属材料有限责任公司 | Powder bed powder paving device and powder bed additive manufacturing equipment |
| CN113352612A (en) * | 2021-06-16 | 2021-09-07 | 威斯坦(厦门)实业有限公司 | A two-way powder feeding mechanism for 3D printer |
| CN114012112A (en) * | 2021-11-05 | 2022-02-08 | 南京铖联激光科技有限公司 | Unloading powder spreading mechanism on 3D printing equipment |
| CN116766588A (en) * | 2023-07-27 | 2023-09-19 | 湖南珞佳智能科技有限公司 | Bidirectional powder spreading device for additive manufacturing and application method thereof |
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| CN113059195A (en) * | 2021-06-03 | 2021-07-02 | 西安赛隆金属材料有限责任公司 | Powder bed powder paving device and powder bed additive manufacturing equipment |
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| CN116766588A (en) * | 2023-07-27 | 2023-09-19 | 湖南珞佳智能科技有限公司 | Bidirectional powder spreading device for additive manufacturing and application method thereof |
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