CN112974848A - Additive manufacturing equipment and method - Google Patents
Additive manufacturing equipment and method Download PDFInfo
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- CN112974848A CN112974848A CN202110194211.3A CN202110194211A CN112974848A CN 112974848 A CN112974848 A CN 112974848A CN 202110194211 A CN202110194211 A CN 202110194211A CN 112974848 A CN112974848 A CN 112974848A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 239000000654 additive Substances 0.000 title claims abstract description 42
- 230000000996 additive effect Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 395
- 238000003892 spreading Methods 0.000 claims abstract description 41
- 230000007480 spreading Effects 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000007639 printing Methods 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims description 11
- 238000005056 compaction Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 3
- 230000007547 defect Effects 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 description 10
- 238000007493 shaping process Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000007648 laser printing Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
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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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses additive manufacturing equipment and a method, which belong to the technical field of additive manufacturing, wherein the additive manufacturing equipment comprises a forming bin; the printing device is arranged in the forming bin; the powder spreading device is arranged in the forming bin; the detection device is fixedly arranged on the inner wall of the forming bin and is used for detecting whether the powder laying layer has powder collapse; the powder adding device is fixedly arranged in the forming bin and is used for adding powder to the powder collapse position; the control assembly is connected with the detection device and the powder adding device respectively, and the control assembly is used for controlling the powder outlet of the powder adding device to move to the powder collapse position when the detection device detects that the powder layer has powder collapse, and controlling the powder adding device to add powder to the powder collapse position through the powder outlet. The invention can improve the density of the powder layer paved in the forming bin, solves the problem of powder defect at one end of the inclined structure, and improves the forming quality of parts.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to additive manufacturing equipment and method.
Background
Compared with the traditional casting, forging and welding combined machining method, the additive manufacturing technology selectively melts metal powder layer by using high-energy beam laser to stack and form metal parts, and has the advantages of short production period, capability of machining parts with complex geometric shapes, more material machining types and the like.
However, in the process of printing, the powder-laying type selective laser melting forming equipment continuously descends and ascends in a reciprocating manner, and powder in the forming cabin collapses to a certain extent through the reciprocating motion of the forming cylinder. If part in the shaping cabin has the inclined structure of great height, inclined structure lower extreme powder can constantly be vibrated the compaction at cylinder body reciprocating motion plain bumper in-process, or big inclined structure lower extreme when printing the in-process and have certain deformation, inclined structure's lower extreme flour end slides down along the lower terminal surface, and inclined structure upper end's powder is because the unable inclined structure lower extreme that gets into of blockking of structure, thereby lead to inclined structure one end to have big powder to lack the layer or the hole, it also has the powder to collapse to lay the powder layer, the powder collapses the shaping quality that can influence the part greatly.
Therefore, there is a need for an additive manufacturing apparatus and method to solve the above problems.
Disclosure of Invention
The invention aims to provide additive manufacturing equipment and method, which can improve the density of a powder layer laid in a forming bin, solve the problem of powder defect at one end of an inclined structure and improve the forming quality of parts.
As the conception, the technical scheme adopted by the invention is as follows:
an additive manufacturing apparatus comprising:
a forming bin;
the printing device is arranged in the forming bin;
the powder spreading device is arranged in the forming bin;
the detection device is fixedly arranged on the inner wall of the forming bin and is used for detecting whether the powder laying layer has powder collapse;
the powder adding device is fixedly arranged in the forming bin and is used for adding powder to the powder collapse position;
the control assembly is used for controlling the powder outlet of the powder adding device to move to the powder collapse position when the powder layer is detected by the detection device to be collapsed by powder, and controlling the powder adding device to add powder to the powder collapse position through the powder outlet.
Optionally, the powder adding device includes a mechanical arm and a control switch, the mechanical arm is fixed on the side wall of the forming bin in a penetrating manner, a powder passage is arranged in the mechanical arm, the inlet end of the powder passage is located outside the forming bin, the outlet end of the powder passage is the powder outlet and is located in the forming bin, and the control switch is installed on the mechanical arm and connected to the control assembly, so that the control assembly controls the conduction or the closing of the powder passage through the control switch.
Optionally, the mechanical arm is connected to the control assembly, and the mechanical arm has an extended state and a retracted state, and when the control assembly determines that the powder layer has the powder collapse, the control assembly controls the mechanical arm to switch from the retracted state to the extended state, so that the powder outlet is located above the powder collapse.
Optionally, the powder adding device includes a powder conveying pipe, and a first mechanical arm and a first control switch that are connected to the control component, respectively, where the first mechanical arm is fixed to an inner wall of the forming bin, the powder conveying pipe includes an inner conveying section and an outer conveying section that are communicated, the inner conveying section is located in the forming bin and is fixedly disposed on the first mechanical arm, the outer conveying section is located outside the forming bin, the control component controls the first mechanical arm to move, so that the first mechanical arm drives the powder outlet of the inner conveying section to move to the powder collapse position, and the first control switch is mounted on the powder conveying pipe, so that the control component controls the powder conveying pipe to be turned on or off through the first control switch.
Optionally, the forming device further comprises a layer spreading device arranged in the forming bin, the layer spreading device is connected to the control assembly, and the control assembly is further configured to control the layer spreading device to compact the layer spreading layer after the powder adding device adds powder to the powder collapse position.
Optionally, the powder adding device further comprises a powder storage device, wherein the powder storage device is communicated with the powder adding device and is used for conveying powder to the powder adding device.
Optionally, spread the powder device including the driving piece and by scraper and the gyro wheel that the driving piece drive removed, the scraper be used for to spread the powder layer and push away the powder, the gyro wheel is used for spreading the compaction spread the powder on the powder layer, the driving piece with control assembly connects, control assembly still is used for controlling opening and close of driving piece.
An additive manufacturing method for the additive manufacturing apparatus includes the following steps:
s1, detecting powder information of the powder laying layer by the detection device, and sending the powder information to the control assembly;
s2, the control assembly judges whether the powder laying layer has powder collapse or not according to the powder information, if yes, the step S3 is executed; if not, go to step S5;
s3, the control component controls the powder adding device to start and controls a powder outlet of the powder adding device to be located at the powder collapse position;
s4, adding a preset amount of powder to the powder collapse part through the powder adding device, and executing the step S5 after the addition is completed;
and S5, controlling the action of a printing device to process the powder on the powder spreading layer, or controlling the action of the powder spreading device to push the powder to the powder spreading layer again.
Optionally, the powder adding device comprises a mechanical arm and a control switch;
in step S3, the control module controls the mechanical arm to switch from the contracted state to the expanded state, so that the powder outlet is located above the powder collapse;
in step S4, the control module controls the control switch to open to add a preset amount of powder to the powder collapse through the powder passage in the robot arm.
Optionally, the powder information is a gray value, and in step S2, when the gray values at the positions of the powder laying layer are the same, it is determined that there is no powder collapse in the powder laying layer; when the positions with the gray values different from those at other positions exist in the powder laying layer, determining that the powder collapse exists in the powder laying layer.
The additive manufacturing equipment and the method provided by the invention at least have the following beneficial effects:
through setting up detection device and powder and adding the device, can whether have the powder to subside to spreading the powder layer and detect, and when confirming that there is the powder to subside in spreading the powder layer, the powder export of control assembly control powder interpolation device moves to the powder department of subsideing, with through the powder interpolation device to the powder department of subsideing add the powder of predetermineeing volume, and then fill the powder on spreading the powder layer and subside, and then promote the density of spreading the powder layer in the storehouse that takes shape, the problem that there is the powder defect in slope structure one end has been solved, the shaping quality of part has been improved.
Drawings
Fig. 1 is a schematic structural diagram of an additive manufacturing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another additive manufacturing apparatus according to an embodiment of the present invention;
fig. 3 is a flowchart of an additive manufacturing method according to a third embodiment of the present invention.
In the figure:
1. a forming bin; 2. a printing device; 3. a powder spreading device; 31. a scraper; 32. a roller; 4. a detection device; 5. a powder adding device; 51. a mechanical arm; 511. a powder passage; 52. a control switch; 6. a powder storage device; 8. a control component; 9. a mechanical arm control line; 10. a control circuit; 20. a part; 30. a powder supplying bin.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
The present embodiment provides an additive manufacturing apparatus that can form a part 20 by way of additive manufacturing, and can improve the quality of forming the part 20.
As shown in fig. 1 and 2, the additive manufacturing apparatus includes a forming chamber 1, a printing device 2 and a powder spreading device 3 respectively disposed in the forming chamber 1, a detecting device 4 and a powder adding device 5 respectively fixed on the forming chamber 1, and a control assembly 8.
Wherein, the forming bin 1 is used for providing space for additive manufacturing, and the printing device 2 is used for melting the powder on the powder laying layer according to a preset path to form the part 20. Illustratively, the printing apparatus 2 may be a laser printing apparatus to enable laser melting processing of the powder. The powder spreading device 3 is used for continuously providing powder to the powder spreading layer by layer. The detection device 4 is fixedly arranged on the inner wall of the forming bin 1 and is used for detecting whether the powder layer is collapsed or not, optionally, the detection device 4 can detect whether the powder layer is collapsed or not at a preset frequency, or the detection device 4 can detect whether the powder layer is collapsed or not by taking the condition that the powder layer laying device leaves the powder layer as a trigger.
The powder adding device 5 is used for adding powder to the powder collapse part. The control assembly 8 is connected with the detection device 4 and the powder adding device 5 respectively, and the control assembly 8 is used for controlling the powder outlet of the powder adding device 5 to move to the powder collapse position when the detection device 4 detects that the powder layer has powder collapse, and controlling the powder adding device 5 to add powder to the powder collapse position through the powder outlet.
In the vibration material disk equipment that this embodiment provided, add device 5 through setting up detection device 4 and powder, can detect spreading whether there is the powder on powder layer to sink, and when confirming that there is powder on powder layer to sink, 8 control assembly control powder that powder adds device 5 export remove to the powder department of collapsing, with through powder add device 5 to the powder department of collapsing add the powder of default, and then fill the powder on the powder layer of spreading and sink, and then promote the density of spreading the powder layer in the storehouse of taking shape, there is the problem of powder defect in the slope structure one end of having solved, the shaping quality of part 20 has been improved.
For example, the detecting device 4 in this embodiment may be a gray level detecting device, and detect the gray level values at the positions of the powder spreading layer by the gray level detecting device, and when the gray level values at the positions of the powder spreading layer are the same, determine that there is no powder collapse in the powder spreading layer; when one or more positions with different gray values from those at other positions exist in the powder laying layer, the powder laying layer is determined to have powder collapse. Or, the detection device 4 may also be a laser range finder capable of measuring the distance between the emission end and each position of the powder laying layer, and when the distances at each position of the powder laying layer are equal, it is determined that no powder collapse exists in the powder laying layer; when there is a position in the powder laying layer whose distance is different from the distances at other positions, it is determined that there is powder collapse in the powder laying layer. Alternatively, in this embodiment, the detection device 4 may be provided in plurality to be able to detect different positions of the powder layer.
In this embodiment, when there are multiple powder sags in the powder laying layer, the control unit 8 may control the powder adding device 5 to sequentially add powder to the multiple powder sags.
Alternatively, as shown in fig. 1, the powder adding apparatus 5 includes a robot arm 51 and a control switch 52. The mechanical arm 51 is fixed on the side wall of the forming bin 1 in a penetrating manner, and as shown in fig. 2, a powder passage 511 is arranged in the mechanical arm 51, the inlet end of the powder passage 511 is located outside the forming bin 1, the outlet end of the powder passage 511 is the powder outlet and is located in the forming bin 1, and powder can be conveyed to the inlet end of the powder passage 511, so that the powder can be added to the powder collapse position through the powder passage 511. The control switch 52 is mounted on the mechanical arm 51 and connected to the control assembly 8, so that the control assembly 8 controls the powder passage 511 to be turned on or off through the control switch 52. In the present embodiment, the powder passage 511 and the robot arm 51 extend in the same direction, so that the position of the powder passage 511 can be controlled by the robot arm 51. For example, the control switch 52 may be a control valve.
Further, referring to fig. 1 and 2, the robot 51 is a retractable robot, that is, the robot 51 has an extended state and a retracted state, and the robot 51 is electrically connected to the control unit 8 through the robot control line 9, when the control unit 8 determines that the powder laying layer has powder collapse, the robot 51 can be controlled to switch from the retracted state to the extended state, so that the powder outlet of the powder passage 511 (and the outlet end of the powder passage 511) is located above the powder collapse. Fig. 1 is a schematic view of the robot arm 51 in a contracted state, and fig. 2 is a schematic view of the robot arm 51 in an extended state.
Still further, the mechanical arm 51 may be formed by connecting a plurality of arm segments, wherein two adjacent arm segments are connected in a universal rotation manner, so that the mechanical arm 51 can extend in a plurality of directions, the reachable range of the mechanical arm 51 is increased, and the flexibility of the mechanical arm 51 is improved.
In this embodiment, in order to further increase the density of the powder on the powder laying layer, the additive manufacturing apparatus further includes a layer compacting device disposed in the forming bin 1 and configured to compact the powder on the powder laying layer. Specifically, the layering and compacting device is connected to the control assembly 8, and the control assembly 8 is further used for controlling the layering and compacting device to compact and lay the powder layer after the powder is added to the powder collapse position by the powder adding device 5.
Optionally, the additive manufacturing apparatus further comprises a powder storage device 6 communicated with the powder adding device 5, specifically, the powder storage device 6 is communicated with the inlet end of the powder passage 511 for conveying powder to the powder passage 511, wherein the powder in the powder storage device 6 is the same as the powder used for manufacturing the part 20. Further, a powder detector may be disposed in the powder storage device 6, and the powder detector is connected to the control component 8 and is used for detecting the amount of powder in the powder storage device 6, and when the amount of powder in the powder storage device 6 is small, a supplementary powder signal may be sent to the control component 8 through the powder detector.
As shown in fig. 1, the powder spreading device 3 includes a driving member, and a scraper 31 and a roller 32 driven by the driving member. Wherein, scraper 31 is used for pushing away the powder to the shop powder layer, and gyro wheel 32 is used for spreading the powder on the compaction shop powder layer for the powder on the shop powder layer can be more even. The drive member is connected to a control unit 8 via a control line 10, and the control unit 8 is also used to control the drive member to be activated and the drive member to be deactivated when required.
Through adding drive piece, printing device 2 and powder and adding device 5 all with control assembly 8 electric connection for control assembly 8 can control drive piece, printing device 2 and powder respectively and add the action of device 5, can also prevent three's mutual interference, has improved the reliability of vibration material disk equipment.
In this embodiment, as shown in fig. 1, the additive manufacturing apparatus may further include a powder supply bin 30 adjacent to the forming bin, where the powder supply bin 30 is configured to supply powder to one end of the workbench, and then a scraper 31 in the powder spreading device 3 pushes the powder at one end of the workbench onto the powder spreading layer at the other end of the workbench, so as to implement a large amount of powder supply to the powder spreading layer, and the powder adding device 5 is configured to implement a local powder supply to the powder spreading layer.
The additive manufacturing equipment provided by the embodiment has the advantages of simple structure, convenience in operation and low cost, and can effectively improve the forming quality of the part 20.
Example two
The additive manufacturing apparatus provided in this embodiment is different from the additive manufacturing apparatus provided in the first embodiment in the specific structure of the powder adding device.
Specifically, the powder adding device in the present embodiment includes a powder conveying pipe, and a first mechanical arm and a first control switch respectively connected to the control unit 8.
The first mechanical arm is fixed on the inner wall of the forming bin 1, the powder conveying pipe comprises an inner conveying section and an outer conveying section which are communicated, the inner conveying section is located in the forming bin 1 and is fixedly arranged on the first mechanical arm so as to be capable of moving along with the first mechanical arm, optionally, the inner conveying section extends along the first mechanical arm, namely, the shape of the inner conveying section is the same as that of the first mechanical arm. The outer conveying section is located outside the forming bin 1 and can convey powder to the inner conveying section through the outer conveying section. The control component 8 controls the first mechanical arm to move so as to drive the powder outlet of the inner conveying section to move to the powder collapse position through the first mechanical arm, and the powder collapse position is filled with powder. The first control switch is installed on the powder conveying pipe, so that the control component 8 controls the powder conveying pipe to be switched on or switched off through the first control switch.
Other structures in this embodiment are the same as those in the first embodiment, and have corresponding effects, which are not described in detail in this embodiment.
EXAMPLE III
This embodiment provides an additive manufacturing method, which is used in the additive manufacturing apparatuses in the first and second embodiments, as shown in fig. 3, and the additive manufacturing method includes the following steps:
s1, the detection device 4 detects the powder information of the powder laying layer and sends the powder information to the control component 8.
S2, the control assembly 8 judges whether the powder layer is collapsed or not according to the powder information, if yes, the step S3 is executed; if not, step S5 is executed.
In this embodiment, the powder information is a gray value, and at this time, in step S2, when the gray values at the positions of the powder-laying layer are the same, it is determined that there is no powder collapse in the powder-laying layer, and when there is a position in the powder-laying layer where the gray value is different from the gray values at other positions, it is determined that there is powder collapse in the powder-laying layer.
S3, the control component 8 controls the powder adding device 5 to start, and controls the powder outlet of the powder adding device 5 to be located at the powder collapse position.
S4, a preset amount of powder is added to the powder collapse part by the powder adding device 5, and step S5 is performed after the addition is completed.
In the present embodiment, the amount of powder added to the powder collapse place may be determined based on the powder information, and specifically, the control unit 8 may determine whether there is powder collapse, the position of the powder collapse, and the degree of the powder collapse based on the powder information, control the movement route of the powder adding device 5 based on the position of the powder collapse, and determine the amount of powder added to the powder collapse place based on the degree of the powder collapse.
And S5, controlling the printing device 2 to act to process the powder on the powder spreading layer, or controlling the powder spreading device 3 to act to push the powder to the powder spreading layer again.
In the additive manufacturing method provided by the embodiment, the powder information of the powder laying layer is detected through the detection device 4, then whether the powder laying layer has powder collapse is determined through the control assembly 8 according to the powder information, when the powder laying layer has powder collapse, the powder outlet of the powder adding device 5 is controlled to move to the powder collapse position, a preset amount of powder is added to the powder collapse position through the powder adding device 5, then the powder collapse on the powder laying layer is filled, the density of the powder laying layer in the forming bin is further improved, the problem that one end of the inclined structure has powder defects is solved, and the forming quality of the part 20 is improved.
Alternatively, when the powder adding apparatus 5 is the powder adding apparatus 5 in the first embodiment, in step S3, the control unit 8 controls the robot arm to switch from the contracted state to the expanded state so that the powder outlet is located above the powder collapse.
Also, in step S4, the control unit 8 controls the control switch to be turned on to add a preset amount of powder to the powder collapse site through the powder passage in the robot arm.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An additive manufacturing apparatus, comprising:
a forming chamber (1);
a printing device (2) arranged in the forming bin (1);
the powder spreading device (3) is arranged in the forming bin (1);
the detection device (4) is fixedly arranged on the inner wall of the forming bin (1), and the detection device (4) is used for detecting whether the powder laying layer collapses or not;
the powder adding device (5) is fixedly arranged on the forming bin (1), and the powder adding device (5) is used for adding powder to the powder collapse position;
and the control assembly is connected with the detection device (4) and the powder adding device (5) respectively, and is used for controlling the powder outlet of the powder adding device (5) to move to the powder collapse position when the detection device (4) detects that the powder collapse exists in the powder laying layer, and controlling the powder adding device (5) to add powder to the powder collapse position through the powder outlet.
2. The additive manufacturing apparatus according to claim 1, wherein the powder adding device (5) comprises a mechanical arm (51) and a control switch (52), the mechanical arm (51) is fixed on a side wall of the forming bin (1) in a penetrating manner, a powder passage (511) is arranged in the mechanical arm (51), an inlet end of the powder passage (511) is located outside the forming bin (1), an outlet end of the powder passage (511) is the powder outlet and is located in the forming bin (1), and the control switch (52) is mounted on the mechanical arm (51) and connected to the control component, so that the control component controls the powder passage (511) to be turned on or off through the control switch (52).
3. Additive manufacturing apparatus according to claim 2, wherein the robotic arm (51) is connected to the control assembly, and wherein the robotic arm (51) has an extended state and a retracted state, and wherein the control assembly controls the robotic arm (51) to switch from the retracted state to the extended state when it is determined that the powder collapse of the powder layer is present, such that the powder outlet is located above the powder collapse.
4. The additive manufacturing apparatus according to claim 1, wherein the powder adding device includes a powder conveying pipe and a first robot arm and a first control switch respectively connected to the control assembly, the first mechanical arm is fixed on the inner wall of the forming bin (1), the powder conveying pipe comprises an inner conveying section and an outer conveying section which are communicated, the inner conveying section is positioned in the forming bin (1), and is fixedly arranged on the first mechanical arm, the outer transmission section is positioned outside the forming bin (1), the control component controls the first mechanical arm to act, so as to drive the powder outlet of the inner transmission section to move to the powder collapse position through the first mechanical arm, the first control switch is arranged on the powder transmission pipe, so that the control component controls the on/off of the powder conveying pipe through the first control switch.
5. The additive manufacturing apparatus according to claim 1, further comprising a layer compaction device disposed within the forming chamber (1), the layer compaction device being connected to the control assembly, the control assembly further being configured to control the layer compaction device to compact the layer of layup after the powder addition device (5) adds powder to the powder collapse.
6. Additive manufacturing apparatus according to claim 1, further comprising a powder storage device (6), said powder storage device (6) being in communication with said powder adding device (5) and being adapted to convey powder to said powder adding device (5).
7. Additive manufacturing apparatus according to claim 1, wherein the powder spreading device (3) comprises a driving member, and a scraper (31) and a roller (32) driven by the driving member to move, the scraper (31) is used for pushing powder to the powder spreading layer, the roller (32) is used for spreading and compacting the powder on the powder spreading layer, the driving member is connected with the control assembly, and the control assembly is further used for controlling the driving member to open and close.
8. An additive manufacturing method for an additive manufacturing apparatus according to any one of claims 1 to 7, comprising the steps of:
s1, detecting powder information of the powder laying layer by the detection device, and sending the powder information to the control assembly;
s2, the control assembly judges whether the powder laying layer has powder collapse or not according to the powder information, if yes, the step S3 is executed; if not, go to step S5;
s3, the control component controls the powder adding device to start and controls a powder outlet of the powder adding device to be located at the powder collapse position;
s4, adding a preset amount of powder to the powder collapse part through the powder adding device, and executing the step S5 after the addition is completed;
and S5, controlling the action of a printing device to process the powder on the powder spreading layer, or controlling the action of the powder spreading device to push the powder to the powder spreading layer again.
9. The additive manufacturing method of claim 8, wherein the powder adding device comprises a robotic arm and a control switch;
in step S3, the control module controls the mechanical arm to switch from the contracted state to the expanded state, so that the powder outlet is located above the powder collapse;
in step S4, the control module controls the control switch to open to add a preset amount of powder to the powder collapse through the powder passage in the robot arm.
10. The additive manufacturing method according to claim 8, wherein the powder information is a gray value, and in step S2, when the gray values at the positions of the powder laying layer are the same, it is determined that the powder laying layer does not have the powder collapse; when the positions with the gray values different from those at other positions exist in the powder laying layer, determining that the powder collapse exists in the powder laying layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110194211.3A CN112974848B (en) | 2021-02-20 | 2021-02-20 | Additive manufacturing equipment and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110194211.3A CN112974848B (en) | 2021-02-20 | 2021-02-20 | Additive manufacturing equipment and method |
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| CN112974848A true CN112974848A (en) | 2021-06-18 |
| CN112974848B CN112974848B (en) | 2023-12-12 |
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| CN114434798A (en) * | 2021-12-28 | 2022-05-06 | 郭超 | 3D printing powder laying method, device and equipment and powder laying system |
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