CN114434798A - 3D printing powder laying method, device and equipment and powder laying system - Google Patents
3D printing powder laying method, device and equipment and powder laying system Download PDFInfo
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- CN114434798A CN114434798A CN202111622575.3A CN202111622575A CN114434798A CN 114434798 A CN114434798 A CN 114434798A CN 202111622575 A CN202111622575 A CN 202111622575A CN 114434798 A CN114434798 A CN 114434798A
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- 239000000843 powder Substances 0.000 title claims abstract description 407
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000010146 3D printing Methods 0.000 title claims abstract description 30
- 238000005056 compaction Methods 0.000 claims abstract description 80
- 230000007246 mechanism Effects 0.000 claims abstract description 73
- 230000007480 spreading Effects 0.000 claims abstract description 12
- 238000003892 spreading Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims description 30
- 238000010410 dusting Methods 0.000 claims description 10
- 238000007639 printing Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000037303 wrinkles Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 13
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- 238000004891 communication Methods 0.000 description 8
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- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
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- 238000003491 array Methods 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
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- 238000010801 machine learning Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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- 230000001953 sensory effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
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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
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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
-
- 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
- B33Y40/10—Pre-treatment
Abstract
The utility model provides a 3D printing powder laying method, device, equipment and powder laying system, the method includes: obtaining a real-time torque value of the compaction roller; comparing the real-time torque value with a preset torque to obtain a comparison result; determining an adjustment strategy according to the comparison result, wherein the adjustment strategy is used for indicating the adjustment mode of the powder feeding rate and/or the powder spreading rate; the powder feeding speed represents the powder discharging speed of the powder feeding mechanism, and the powder laying speed represents the moving speed of the powder feeding mechanism along the powder laying direction; and executing the adjustment strategy. According to the 3D printing powder laying method, the device and the equipment and the powder laying system, the consistency of the thickness and the density of the laid powder layer can be ensured, the method is suitable for powder materials with poor flowability, the defects of trailing, gully, wrinkle and the like of the powder layer are avoided, and the requirement of manufacturing high-quality parts is met.
Description
Technical Field
The disclosure relates to the technical field of 3D printing, in particular to a 3D printing powder laying method, device and equipment and a powder laying system.
Background
In adhesive-based 3D printing technology, powder laying is a crucial part, and the quality of powder laying directly affects the quality of the printed product. Existing powder paving methods typically employ a combination of a screed and a compaction roller, specifically, a screed in front of the dusting direction and a compaction roller behind the dusting direction, the screed distributing and screeding the powder, the compaction roller then compacting the powder. However, the combined solution of the scraper and the compacting roller is difficult to adapt to the powder material with poor flowability, so that the powder layer often has defects such as trailing, ravines, wrinkles, etc., and the consistency of the thickness and density of the powder layer at different positions is not good enough to meet the requirement of manufacturing high-quality parts.
Disclosure of Invention
The present disclosure provides a 3D printing powder paving method, device, equipment and powder paving system to at least solve the above technical problems existing in the prior art.
According to a first aspect of the present disclosure, there is provided a 3D printing powder paving method applied to a powder paving system including at least a powder feeding mechanism and a compaction roller, the method comprising: obtaining a real-time torque value for the compaction roller; comparing the real-time torque value with a preset torque to obtain a comparison result; determining an adjustment strategy according to the comparison result, wherein the adjustment strategy is used for indicating the adjustment mode of the powder feeding rate and/or the powder spreading rate; the powder feeding speed represents the powder discharging speed of the powder feeding mechanism, and the powder laying speed represents the moving speed of the powder feeding mechanism along the powder laying direction; and executing the adjustment strategy.
In an embodiment, the determining an adjustment policy according to the comparison result includes: if the real-time torque value is larger than the preset torque, reducing the powder feeding rate and/or increasing the powder paving rate until the real-time torque value meets the preset torque; and if the real-time torque value is smaller than the preset torque, increasing the powder feeding rate and/or reducing the powder paving rate until the real-time torque value meets the preset torque.
In an embodiment, the determining an adjustment policy according to the comparison result includes: setting a rotational speed of the compaction roller to a first rotational speed; setting the dusting rate to a first dusting rate; if the real-time torque value is larger than the preset torque, reducing the powder feeding rate until the real-time torque value meets the preset torque; and if the real-time torque value is smaller than the preset torque, increasing the powder feeding rate until the real-time torque value meets the preset torque.
In one embodiment, the powder feeding mechanism is provided with a powder distribution roller therein, and the reducing the powder feeding rate includes: reducing the rotational speed of the powder dispensing roller; the increasing the powder feeding rate comprises: increasing the rotational speed of the powder dispensing roller.
According to a second aspect of the present disclosure, there is provided a powder paving system for performing the method of the present disclosure, the system comprising: the powder feeding mechanism, the compaction roller and the measuring mechanism are arranged on a rack, the powder feeding mechanism, the compaction roller and the measuring mechanism are connected with an electronic circuit of the controller, the rack is connected with a first driving device, the first driving device is connected with the electronic circuit of the controller, the compaction roller is connected with the measuring mechanism, and the measuring mechanism is used for measuring a real-time torque value of the compaction roller.
In an embodiment, the powder feeding mechanism comprises a powder hopper, a powder receiving box and a powder distributing roller, wherein a powder outlet is arranged below the powder hopper and is connected with a powder inlet on the upper part of the powder receiving box, a cavity with a string-shaped cross section is arranged inside the powder receiving box, the powder distributing roller is arranged in the cavity, the powder distributing roller can rotate in the cavity, and the edge of the powder distributing roller is provided with uniformly distributed grooves.
In an embodiment, the powder feeding mechanism further comprises an ultrasonic transducer connected to the powder receiving box, and the ultrasonic transducer is configured to vibrate the powder receiving box.
In one embodiment, the measuring device comprises a torque sensor for measuring a real-time torque value of the compacting roller and a second drive for driving the compacting roller into rotation.
According to a third aspect of the present disclosure, there is provided a 3D printing powder laying apparatus applied to a 3D printing powder laying system, the 3D printing powder laying system including at least a powder feeding mechanism and a compaction roller, the apparatus including: an obtaining module for obtaining a real-time torque value of the compaction roller; the comparison module is used for comparing the real-time torque value with a preset torque to obtain a comparison result; the determining module is used for determining an adjusting strategy according to the comparison result, and the adjusting strategy is used for indicating the adjusting mode of the powder feeding rate and/or the powder spreading rate; the powder feeding speed represents the powder discharging speed of the powder feeding mechanism, and the powder laying speed represents the moving speed of the powder feeding mechanism along the powder laying direction; and the execution module is used for executing the adjustment strategy.
According to a fourth aspect of the present disclosure, there is provided an electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the methods of the present disclosure.
According to the 3D printing powder laying method, the device, the equipment and the powder laying system, the powder feeding speed and/or the powder laying speed are/is adjusted according to the comparison result of the real-time torque value of the compaction roller and the preset torque, the consistency of the thickness and the density of the powder layer can be ensured, the powder layer is suitable for powder materials with poor flowability, the defects of trailing, gully, wrinkle and the like of the powder layer are avoided, and the requirement of manufacturing high-quality parts is met.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Fig. 1 shows a schematic flow diagram of a 3D printing powder laying method according to a first embodiment of the disclosure;
fig. 2 shows a schematic flow diagram of a 3D printing powder laying method according to a second embodiment of the disclosure;
fig. 3 shows a schematic flow diagram of a 3D printing powder laying method according to a third embodiment of the disclosure;
FIG. 4 shows a schematic diagram of a powder paving system according to a fourth embodiment of the present disclosure;
FIG. 5 is a schematic diagram showing a powder feeding mechanism of a powder paving system according to a fifth embodiment of the present disclosure;
fig. 6 shows a schematic structural diagram of a 3D printing powder laying device according to a sixth embodiment of the disclosure;
fig. 7 is a schematic diagram illustrating a composition structure of an electronic device according to a seventh embodiment of the present disclosure.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Fig. 1 shows a schematic flow diagram of a 3D printing powder paving method according to a first embodiment of the disclosure, and as shown in fig. 1, the method is applied to a powder paving system, the powder paving system at least includes a powder feeding mechanism and a compaction roller, and the method specifically includes:
and step S101, obtaining a real-time torque value of the compaction roller.
In this embodiment, the real-time torque value of the compaction roller may be indicative of the thickness of the powder layer to be compacted, i.e. the thickness of the laid powder layer, and thus it is first necessary to obtain the real-time torque value of the compaction roller.
In an implementation manner, the real-time torque value of the compaction roller may be measured by using a torque sensor, and the real-time torque value of the compaction roller may be measured by connecting the torque sensor to the compaction roller, specifically, the real-time torque value of the compaction roller may be measured by using a metal resistance strain gauge type torque sensor, a potentiometer type torque sensor or a non-contact type torque sensor, and the like, and the type and the model of the torque sensor are not limited in the present disclosure.
And S102, comparing the real-time torque value with a preset torque to obtain a comparison result.
In this embodiment, the speed of rotation of the compaction roller is inversely proportional to the real-time torque value of the compaction roller, i.e., the slower the speed of rotation of the compaction roller, the greater the real-time torque value of the compaction roller. In the process of compacting the powder by the compaction roller, if the thickness of the laid powder layer is increased, the larger the resistance borne by the compaction roller in the rotating process is, the slower the rotating speed of the compaction roller is, and the larger the real-time torque value of the compaction roller is; conversely, if the thickness of the laid powder layer is reduced, the smaller the resistance force applied to the compaction roller during rotation, the faster the rotation speed of the compaction roller, and the smaller the real-time torque value of the compaction roller, that is, the real-time torque value of the compaction roller can represent the thickness of the laid powder layer. Therefore, after obtaining the real-time torque value of the compaction roller, the real-time torque value of the compaction roller can be compared with the preset torque, so that whether the thickness of the laid powder layer meets the requirement or not can be known.
In an embodiment, the preset torque may be a specific value or a range, the specific value depends on the type of the powder, the process parameters of the powder paving system, and the printing requirement, and the operator may select the optimal preset torque according to experience. And under the condition that the preset torque is in a range, if the real-time torque value of the compaction roller falls into the range of the preset torque, the thickness of the laid powder layer is considered to meet the requirement.
Step S103, determining an adjustment strategy according to the comparison result, wherein the adjustment strategy is used for indicating the adjustment mode of the powder feeding rate and/or the powder laying rate; the powder feeding rate represents the powder discharging rate of the powder feeding mechanism, and the powder laying rate represents the moving rate of the powder feeding mechanism along the powder laying direction.
In this embodiment, an adjustment strategy, that is, how to adjust the powder feeding rate and/or the powder laying rate, needs to be determined according to a comparison result between the real-time torque value of the compacting roller and the preset torque, where the powder feeding rate represents a powder discharging rate of the powder feeding mechanism, and the powder laying rate represents a moving rate of the powder feeding mechanism in the powder laying direction.
In one embodiment, the powder withdrawal rate and the powder laying rate may affect the thickness of the laid powder layer. Generally, when the powder laying rate is a fixed value, the thicker the laid powder layer is when the powder discharging rate of the powder feeding mechanism is larger, and the thinner the laid powder layer is when the powder discharging rate of the powder feeding mechanism is smaller; in the case of a constant powder discharge rate, the larger the powder laying rate, the thinner the laid powder layer, and the smaller the powder laying rate, the thicker the laid powder layer. Therefore, after the comparison result of the real-time torque value of the compaction roller and the preset torque is obtained, the powder feeding rate and/or the powder laying rate can be adjusted according to the comparison result, so that the thickness of the laid powder layer can meet the requirement.
And step S104, executing the adjustment strategy.
In this embodiment, after determining the adjustment strategy, i.e. how to adjust the powder feeding rate and/or the powder spreading rate, the powder paving system may be controlled to execute the adjustment strategy.
In the first embodiment of the disclosure, the thickness of the laid powder layer is characterized by the real-time torque value of the compaction roller, and the real-time torque value of the compaction roller is compared with the preset torque to determine how to adjust the powder feeding rate and/or the powder laying rate, so that the thickness of the laid powder layer meets the requirement, and the powder feeding device is suitable for powder with poor flowability, and can ensure consistency of the thickness and density of the powder layer at different positions.
Fig. 2 is a schematic flow chart of a 3D printing powder laying method according to a second embodiment of the disclosure, and as shown in fig. 2, step S103 specifically includes:
step S201, if the real-time torque value is larger than the preset torque, reducing the powder feeding rate and/or increasing the powder paving rate until the real-time torque value meets the preset torque.
In this embodiment, if the real-time torque value of the compaction roller is greater than the preset torque, it is proved that the rotation speed of the compaction roller is slowed due to the fact that the laid powder layer is too thick, at this time, the powder feeding rate of the powder feeding mechanism may be reduced or the powder laying rate may be increased, or the powder feeding rate of the powder feeding mechanism may be reduced and the powder laying rate may be increased at the same time until the real-time torque value of the compaction roller meets the preset torque, that is, until the thickness of the laid powder layer meets the requirement.
In an implementation mode, a powder distribution roller is arranged in the powder feeding mechanism, and the higher the rotating speed of the powder distribution roller is, the higher the powder feeding speed of the powder feeding mechanism is; the smaller the rotation speed of the powder distribution roller, the smaller the powder feeding rate of the powder feeding mechanism, and therefore, in the present embodiment, the powder feeding rate can be reduced by reducing the rotation speed of the powder distribution roller.
In another embodiment, the powder feeding mechanism is connected with the rack, so that the powder spreading rate can be adjusted by adjusting the moving speed of the rack, and specifically, the greater the speed of the rack, the greater the powder spreading rate; the smaller the speed of the stage, the smaller the powder laying rate, and therefore, in the present embodiment, the powder laying rate can be increased by increasing the speed of the stage.
And S202, if the real-time torque value is smaller than the preset torque, increasing the powder feeding rate and/or reducing the powder paving rate until the real-time torque value meets the preset torque.
In this embodiment, if the real-time torque value of the compaction roller is smaller than the preset torque, it is proved that the rotation speed of the compaction roller becomes faster due to the fact that the laid powder layer is too thin, and at this time, the powder feeding rate of the powder feeding mechanism may be increased or the powder laying rate may be decreased, or the powder feeding rate of the powder feeding mechanism may be increased and the powder laying rate may be decreased at the same time until the real-time torque value of the compaction roller meets the preset torque, that is, until the thickness of the laid powder layer meets the requirement.
In one embodiment, the powder feed rate may be increased by increasing the rotational speed of the powder dispensing roller.
In another embodiment, the dusting rate may be reduced by reducing the speed of the gantry.
In the second embodiment of the disclosure, how to adjust the powder feeding rate and/or the powder laying rate is determined according to the comparison result of the real-time torque value of the compaction roller and the preset torque, and if the real-time torque value of the compaction roller is larger than the preset torque, the powder feeding rate is reduced and/or the powder laying rate is increased; if the real-time torque value of the compaction roller is smaller than the preset torque, the powder feeding speed is increased and/or the powder laying speed is reduced, so that the thickness of the laid powder layer is accurately adjusted to meet the requirement.
Fig. 3 is a schematic flow chart of a 3D printing powder laying method according to a third embodiment of the disclosure, and as shown in fig. 3, step S103 specifically includes:
in step S301, the rotational speed of the compaction roller is set to a first rotational speed.
In this embodiment, since the rotation speed of the compaction roller also affects the real-time torque value of the compaction roller, the rotation speed of the compaction roller needs to be set to a fixed value, i.e. a first rotation speed, and the value of the first rotation speed can be determined by a worker according to the type of powder and the process parameters of the powder paving system.
Step S302, the powder laying rate is set to a first powder laying rate.
In this embodiment, the powder laying rate may be set to a constant value by adjusting the speed of the gantry, i.e., a first powder laying rate, which may be determined by a worker according to the type of powder and the process parameters of the powder laying system, etc.
Step S303, if the real-time torque value is larger than the preset torque, reducing the powder feeding rate until the real-time torque value meets the preset torque.
In this embodiment, if the real-time torque value of the compaction roller is greater than the preset torque, it is proved that the rotation speed of the compaction roller is slowed due to the fact that the laid powder layer is too thick, and at this time, the powder feeding speed of the powder feeding mechanism can be reduced until the real-time torque value of the compaction roller meets the preset torque, that is, until the thickness of the laid powder layer meets the requirement.
In one embodiment, the powder feed rate may be reduced by reducing the rotational speed of the powder dispensing roller.
And step S304, if the real-time torque value is smaller than the preset torque, increasing the powder feeding rate until the real-time torque value meets the preset torque.
In this embodiment, if the real-time torque value of the compaction roller is smaller than the preset torque, it is proved that the rotation speed of the compaction roller becomes fast due to the fact that the laid powder layer is too thin, and at this time, the powder feeding speed of the powder feeding mechanism can be increased until the real-time torque value of the compaction roller meets the preset torque, that is, until the thickness of the laid powder layer meets the requirement.
In one embodiment, the powder feed rate may be increased by increasing the rotational speed of the powder dispensing roller.
In the third embodiment of the disclosure, the rotating speed and the powder laying rate of the compaction roller are set to be fixed values, and then how to adjust the powder feeding rate of the powder feeding mechanism is determined according to the comparison result of the real-time torque value of the compaction roller and the preset torque, so that the adjustment strategy is simpler and more convenient, the efficiency of the powder laying system is improved, and the thickness of the laid powder layer is further ensured to meet the requirement.
Fig. 4 shows a schematic structural diagram of a powder paving system according to a fourth embodiment of the disclosure, and as shown in fig. four, the system is used for executing a 3D printing powder paving method of the disclosure, and the system mainly includes: powder feeding mechanism 1, compaction roller 2, measuring mechanism I and controller 7, powder feeding mechanism 1, compaction roller 2 and measuring mechanism I set up on rack 5, powder feeding mechanism 1, compaction roller 2 and measuring mechanism I are connected with controller 7 electronic circuit, rack 5 is connected with first drive arrangement 6, first drive arrangement 6 is connected with controller 7 electronic circuit, compaction roller 2 and measuring mechanism I are connected, measuring mechanism I is used for measuring the real-time torque value of compaction roller 2.
In the present embodiment, the powder feeding mechanism 1 is used to feed powder; the compacting roller 2 is arranged behind the powder feeder 1 relative to the powder laying direction and is used for compacting the powder output by the powder feeder 1; the measuring mechanism I is used for measuring a real-time torque value of the compaction roller 2 during rotation; the rack 5 can move along the powder laying direction, the first driving device 6 can drive the rack 5 to move along the powder laying direction at a preset speed, and the powder feeding mechanism 1 is connected with the rack 5, so that the speed of the rack 5 along the powder laying direction is the speed of the powder feeding mechanism 1 along the powder laying direction, namely the powder laying speed; the controller 7 is used for controlling the powder feeding speed of the powder feeding mechanism 1, the rotating speed of the compacting roller 2 and the moving speed of the rack 5 along the powder laying direction, and the controller 7 can collect the real-time torque value measured by the measuring mechanism I in real time.
In one possible embodiment, the measuring mechanism i comprises a torque sensor 3 and a second driving device 4, the torque sensor 3 is used for measuring the real-time torque value of the compacting roller 2, the second driving device 4 is used for driving the compacting roller 2 to rotate, and specifically, the second driving device 4 can drive the compacting roller 2 to rotate reversely relative to the powder laying direction, that is, if the powder laying direction is left, the compacting roller 2 rotates clockwise; if the dusting direction is to the right, the compacting roller 2 rotates counterclockwise.
Fig. 5 is a schematic structural diagram 5 of a powder feeding mechanism of a powder paving system according to a fifth embodiment of the disclosure, in which the powder feeding mechanism 1 mainly includes: the powder receiving device comprises a powder hopper 101, a powder receiving box 102 and a powder distribution roller 104, wherein a powder outlet is arranged below the powder hopper 101 and is connected with a powder inlet at the upper part of the powder receiving box 102, a cavity with a chord-shaped section is arranged inside the powder receiving box 102, the powder distribution roller 104 is arranged in the cavity, the powder distribution roller 104 can rotate in the cavity, and the edge of the powder distribution roller 104 is provided with uniformly distributed grooves.
In the present embodiment, the cavity of the powder receiving cartridge 102 forms a half-enclosure structure for the powder distributing roller 104, the groove at the edge of the powder distributing roller 104 is used to receive the powder dropped from the powder hopper 101, and when the groove of the powder distributing roller 104 is rotated out of the powder receiving cartridge 102, the powder drops onto the powder bed 8, thereby completing the powder conveyance.
In one embodiment, the powder feeding mechanism 1 further comprises an ultrasonic transducer 103, the ultrasonic transducer 103 is connected to the powder receiving box 102, and the ultrasonic transducer 103 is used for vibrating the powder receiving box 102 so as to avoid powder arching and agglomeration, so that the powder is in a flowing state and can smoothly enter and leave the grooves of the powder distribution roller 204.
In an embodiment, the width of the powder outlet of the powder hopper 101 or the inlet of the powder receiving box 102 is smaller than the diameter of the powder distribution roller 104 and is disposed on one side of the center line of the powder distribution roller 104 so that the powder can flow out from the side of the center line of the powder hopper 101 without the powder falling off on the other side, as shown in fig. 4, the powder hopper 101 is disposed on the right side of the center line of the powder distribution roller 104, and the powder distribution roller rotates clockwise so that the powder can flow out from the right side of the center line of the powder distribution roller 104 without the powder falling off on the left side of the center line of the powder distribution roller 104.
In one embodiment, the length of the outlet of the powder hopper 101, the inlet of the powder receiving box 102, the chordal cavity of the powder receiving box 102, and the powder distribution roller 104 in the direction perpendicular to the plane of the paper is no less than the width of the powder layer to be laid.
In an embodiment, the powder compacting roller 2 is behind the powder feeding mechanism 1 with respect to the powder laying direction, and the height of its lower edge is lower than the lower edge of the powder distributing roller 104 in the powder feeder 1, and the height of the powder compacting roller 2 from the powder bed 8 can be manually adjusted according to the actual situation.
In one embodiment, the shape of the groove of the powder distribution roller 104 may be: the smaller the width of the groove, the closer to the center of the powder distribution roller 104, the shape of the groove such that the powder can relatively easily leave the groove, reducing the situation in which the powder is stuck in the groove, and specifically, the shape of the groove may be trapezoidal, arc-shaped, or the like.
In an embodiment, if the cross-sectional area of each groove is S, N grooves are distributed on the powder distribution roller 104, and the rotation speed of the powder distribution roller 104 during the powder laying process is N circles/second, the volume of the powder sent out by the powder distribution roller 104 per unit time is: v — N × S × W, where W is the width of the powder layer to be laid. Assuming a powder laying speed v, the average thickness of the uncompacted powder layer in this unit time is:
that is, the rotation speed n of the powder distribution roller 104 is proportional to the thickness of the laid powder layer, and the powder laying speed v is inversely proportional to the laid powder layer.
In one embodiment, the number of grooves N of the powder distribution roller 104 may be 20 to 200, and the groove cross-sectional area S may be 0.1 to 0.5mm2(square millimeter), the value of the distribution roller rotating speed n can be 02-2 circles/second, the powder spreading speed v can be 0.05-0.5m/s (meter per second), and the thickness t of the uncompacted powder layer can be 20-200 μm (micrometer).
In the fourth and fifth embodiments of the present disclosure, a powder paving system is provided, which can be used to execute a 3D printing powder paving method of the present disclosure, so that the thickness of the paved powder layer can meet the requirement, and the consistency of the thickness and density of the powder layer at different positions can be ensured when the powder paving system is applied to powder with poor flowability.
Fig. 6 is a schematic structural diagram of a 3D printing powder paving apparatus according to a sixth embodiment of the disclosure, as shown in fig. 6, the apparatus includes:
an obtaining module 60 for obtaining a real-time torque value of the compaction roller; the comparison module 61 is used for comparing the real-time torque value with a preset torque to obtain a comparison result; a determining module 62, configured to determine an adjustment strategy according to the comparison result, where the adjustment strategy is used to indicate an adjustment manner of the powder feeding rate and/or the powder spreading rate; the powder feeding speed represents the powder discharging speed of the powder feeding mechanism, and the powder laying speed represents the moving speed of the powder feeding mechanism along the powder laying direction; and an executing module 63, configured to execute the adjustment policy.
As shown in fig. 6, the determination module 62 includes:
the first determining submodule 621 is configured to reduce the powder feeding rate and/or increase the powder spreading rate if the real-time torque value is greater than the preset torque until the real-time torque value meets the preset torque; and the second determining submodule 622 is configured to increase the powder feeding rate and/or decrease the powder spreading rate if the real-time torque value is smaller than the preset torque until the real-time torque value meets the preset torque.
As shown in fig. 6, the determination module 62 further includes:
a first setting sub-module 623 for setting the rotation speed of the compaction roller to a first rotation speed; a second setting submodule 624 for setting the dusting rate to the first dusting rate; a reducing submodule 625, configured to reduce the powder feeding rate if the real-time torque value is greater than the preset torque until the real-time torque value meets the preset torque; and the increasing submodule 626 is configured to increase the powder feeding rate if the real-time torque value is smaller than the preset torque until the real-time torque value meets the preset torque.
The present disclosure also provides an electronic device and a readable storage medium according to an embodiment of the present disclosure.
FIG. 7 illustrates a schematic block diagram of an example electronic device 700 that can be used to implement embodiments of the present disclosure. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the disclosure described and/or claimed herein.
As shown in fig. 7, the device 700 comprises a computing unit 701, which may perform various suitable actions and processes according to a computer program stored in a Read Only Memory (ROM)702 or a computer program loaded from a storage unit 708 into a Random Access Memory (RAM) 703. In the RAM 703, various programs and data required for the operation of the device 700 can also be stored. The computing unit 701, the ROM 702, and the RAM 703 are connected to each other by a bus 704. An input/output (I/O) interface 705 is also connected to bus 704.
Various components in the device 700 are connected to the I/O interface 705, including: an input unit 706 such as a keyboard, a mouse, or the like; an output unit 707 such as various types of displays, speakers, and the like; a storage unit 708 such as a magnetic disk, optical disk, or the like; and a communication unit 709 such as a network card, modem, wireless communication transceiver, etc. The communication unit 709 allows the device 700 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
Program code for implementing the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), and the Internet.
The computer system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server may be a cloud server, a server of a distributed system, or a server with a combined blockchain.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and the present disclosure is not limited herein.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. A 3D printing powder paving method, applied to a powder paving system comprising at least a powder feed mechanism and a compaction roller, the method comprising:
obtaining a real-time torque value for the compaction roller;
comparing the real-time torque value with a preset torque to obtain a comparison result;
determining an adjustment strategy according to the comparison result, wherein the adjustment strategy is used for indicating the adjustment mode of the powder feeding rate and/or the powder spreading rate; the powder feeding speed represents the powder discharging speed of the powder feeding mechanism, and the powder laying speed represents the moving speed of the powder feeding mechanism along the powder laying direction;
and executing the adjustment strategy.
2. The method of claim 1, wherein determining an adjustment policy based on the comparison comprises:
if the real-time torque value is larger than the preset torque, reducing the powder feeding rate and/or increasing the powder paving rate until the real-time torque value meets the preset torque;
and if the real-time torque value is smaller than the preset torque, increasing the powder feeding rate and/or reducing the powder paving rate until the real-time torque value meets the preset torque.
3. The method of claim 1, wherein determining an adjustment policy based on the comparison comprises:
setting a rotational speed of the compaction roller to a first rotational speed;
setting the dusting rate to a first dusting rate;
if the real-time torque value is larger than the preset torque, reducing the powder feeding rate until the real-time torque value meets the preset torque;
and if the real-time torque value is smaller than the preset torque, increasing the powder feeding rate until the real-time torque value meets the preset torque.
4. A method according to claim 2 or 3, characterized in that a powder distribution roller is arranged in the powder feeding mechanism,
the reducing powder feeding rate comprises the following steps: reducing the rotational speed of the powder dispensing roller;
the increasing the powder feeding rate comprises: increasing the rotational speed of the powder dispensing roller.
5. A powder paving system for carrying out the method of any one of claims 1-4, characterized in that the system comprises: the powder feeding mechanism, the compaction roller and the measuring mechanism are arranged on a rack, the powder feeding mechanism, the compaction roller and the measuring mechanism are connected with an electronic circuit of the controller, the rack is connected with a first driving device, the first driving device is connected with the electronic circuit of the controller, the compaction roller is connected with the measuring mechanism, and the measuring mechanism is used for measuring a real-time torque value of the compaction roller.
6. The system of claim 5 wherein said powder delivery mechanism comprises a powder hopper having a powder outlet below, a powder receiving box connected to a powder inlet at an upper portion of said powder receiving box, a powder distribution roller having a chordal cross-section cavity disposed within said powder receiving box, said powder distribution roller being mounted within said cavity, said powder distribution roller being rotatable within said cavity, said powder distribution roller having evenly distributed grooves at its edges.
7. The system of claim 6 wherein said powder delivery mechanism further comprises an ultrasonic transducer, said ultrasonic transducer being coupled to said powder receiving cartridge, said ultrasonic transducer being adapted to vibrate said powder receiving cartridge.
8. The system of claim 5, wherein the measuring mechanism includes a torque sensor for measuring a real-time torque value of the compaction roller and a second drive for driving the compaction roller to rotate.
9. A3D printing powder laying device is applied to a 3D printing powder laying system, the 3D printing powder laying system at least comprises a powder feeding mechanism and a compaction roller, and the device comprises:
an obtaining module for obtaining a real-time torque value of the compaction roller;
the comparison module is used for comparing the real-time torque value with a preset torque to obtain a comparison result;
the determining module is used for determining an adjusting strategy according to the comparison result, and the adjusting strategy is used for indicating the adjusting mode of the powder feeding rate and/or the powder spreading rate; the powder feeding speed represents the powder discharging speed of the powder feeding mechanism, and the powder laying speed represents the moving speed of the powder feeding mechanism along the powder laying direction;
and the execution module is used for executing the adjustment strategy.
10. An electronic device, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.
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