CN117734168A - Powder supply laying mechanism and powder supply laying method - Google Patents
Powder supply laying mechanism and powder supply laying method Download PDFInfo
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- CN117734168A CN117734168A CN202410044344.6A CN202410044344A CN117734168A CN 117734168 A CN117734168 A CN 117734168A CN 202410044344 A CN202410044344 A CN 202410044344A CN 117734168 A CN117734168 A CN 117734168A
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- powder
- tool
- laying
- supply
- discharge port
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- 239000000843 powder Substances 0.000 title claims abstract description 295
- 230000007246 mechanism Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007639 printing Methods 0.000 claims abstract description 42
- 238000007790 scraping Methods 0.000 claims abstract description 27
- 230000007480 spreading Effects 0.000 claims description 52
- 239000000654 additive Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Abstract
The invention discloses a powder supply laying mechanism and a method, wherein the mechanism comprises a supply cavity with a discharge hole at the upper part, a powder transferring tool and a powder laying assembly, wherein the powder transferring tool and the powder laying assembly are configured to reciprocate between an original position in the supply cavity and a powder laying position at the discharge hole, the powder laying assembly is positioned above the discharge hole and can transversely move, the powder laying assembly comprises a bracket, a powder laying tool arranged on the bracket and at least one powder scraping tool arranged on the bracket, the at least one powder scraping tool is configured to remove excessive powder positioned above a second horizontal plane from the powder transferring tool positioned at the powder laying position when transversely moving, the second horizontal plane is positioned above the first horizontal plane, and a powder laying roller is configured to transfer and lay powder from the powder transferring tool positioned at the powder laying position onto a printing platform when transversely moving.
Description
Technical Field
The present application relates to the technical field of additive manufacturing equipment, and in particular, to a powder supply laying mechanism and a powder supply laying method for supplying and laying powder to a printing platform of additive manufacturing equipment.
Background
In powder 3D printing techniques, the target part is produced in powder layers stacked one on top of the other. Whether printing is successful or not, whether the part is elegant or not, and depends largely on the uniformity of the powder layer lay-up. And in order to improve printing efficiency, a bidirectional powder spreading structure is generally adopted.
A build material supply method is disclosed in publication No. CN107530970a, which includes moving a portion of build material from the supply module to the top of the supply module using rotatable blades; and spreading the build material of the moving part across the support platform. In this scheme, when laying every layer of powder, the powder volume that provides the shop's powder roller and lay can appear the size inequality to shop's powder roller is spreading when powder, and powder overflows easily and spreads the powder roller, or because shop's powder first half way powder volume is too big, causes shop's powder inhomogeneous, produces the ripple form, thereby influences the quality of 3D printing product.
Disclosure of Invention
It is an object of the present application to provide a powder supply laying mechanism and a powder supply laying method, in which it is desirable to improve the consistency of a powder layer laid on a printing platform.
In a first aspect of the present application, there is provided a powder supply laying mechanism for supplying and laying powder to a printing platform of an additive manufacturing apparatus, the powder supply laying mechanism comprising:
a supply chamber for holding powder and having an upper discharge port, said discharge port being located on a first horizontal plane and capable of interfacing with said printing platform;
a powder transport tool configured to be reciprocally movable between a home position within the supply chamber and a powder placement position at the discharge port; and
a powder spreading assembly located above the discharge port and capable of moving laterally, the powder spreading assembly comprising a bracket, a powder spreading tool mounted on the bracket, and at least one powder scraping tool configured to remove excess powder located above a second level from the powder transporting tool located at the powder spreading position when moving laterally, the second level being above the first level, the powder spreading roller being configured to transfer and spread powder from the powder transporting tool located at the powder spreading position to the printing platform when moving laterally.
According to the scheme, by arranging the powder scraping tool, the excessive powder on the powder transferring tool can be removed before the powder is paved by the powder paving tool, so that the powder transferring tool can retain a certain amount of powder each time, and the powder paved each time is kept consistent; therefore, the powder amount for being paved to the printing platform each time can be simply controlled by designing the height position of the powder scraping tool.
With reference to the first aspect, in certain embodiments of the first aspect, the powder spreading tool includes a powder spreading roller, and the powder spreading roller can be rotatably disposed on the support around its own axis.
With reference to the first aspect, in certain embodiments of the first aspect, the number of the powder scraping tools is one, and a pair of the powder scraping tools are supported on the bracket and are respectively located at two sides of the powder spreading roller in the transverse direction.
With reference to the first aspect, in certain embodiments of the first aspect, a self-axis of the powder spreading roller is located above the second horizontal plane.
With reference to the first aspect, in certain embodiments of the first aspect, the scraping tool has a bottom end portion, and the bottom end portion extends longitudinally and is located on the second horizontal plane.
With reference to the first aspect, in certain embodiments of the first aspect, the powder transport tool includes a rotary blade rotatably disposed within the supply cavity, the rotary blade having a support surface capable of supporting the powder, the support surface extending in a longitudinal direction; the support surface is positioned at the first level when the powder handling tool is in the powder laying position.
With reference to the first aspect, in certain embodiments of the first aspect, the discharge port has a first edge portion and a second edge portion opposite to each other, the first edge portion being configured to interface with the printing platform; when the powder transferring tool is at the original position, the rotating blade is close to the second edge part.
In a second aspect of the present application, a powder supply laying method for transferring and laying powder located in a supply chamber from a discharge port in an upper portion of the supply chamber to a printing platform of an additive manufacturing apparatus, the method comprising: transferring powder from said loading chamber to said discharge port by means of a powder transfer tool reciprocally movable between said supply chamber interior and said discharge port and retaining said powder transfer tool at said discharge port; removing excess powder from the powder transfer tool beyond a set height by means of a powder scraping tool capable of moving laterally over the discharge port; and transferring and laying at least part of the powder on the powder transferring tool onto the printing platform by using a laying tool capable of transversely moving above the discharge hole.
With reference to the second aspect, in certain embodiments of the second aspect, in the method, the removed excess of the powder is returned to the supply chamber or transferred to a collection chamber.
With reference to the second aspect, in certain embodiments of the second aspect, in the method, a direction of lateral movement of the doctor blade when removing excess of the powder is opposite to a direction of lateral movement of the laying tool when transferring and laying at least part of the powder to the printing platform.
Other advantages of the present invention will be apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a powder supply paving mechanism according to one embodiment of the present application;
FIG. 2 is a schematic illustration of a supply chamber provided in one embodiment of the present application;
FIG. 3 is a schematic view of a rotary blade according to one embodiment of the present application in a powder lay-up position;
FIG. 4 is a schematic view of a rotary blade according to one embodiment of the present application in a home position;
FIG. 5 is a schematic view of a powder supply paving mechanism according to another embodiment of the present application;
FIG. 6 is a schematic diagram showing the relative relationship between the powder spreading assembly and the rotary blade during operation;
FIG. 7 is a second schematic illustration of the relative relationship between the powder placement assembly and the rotary blade in operation;
FIG. 8 is a schematic view of a first state of the powder supply paving mechanism of the present application in operation; wherein, the powder spreading component is in a stay position, and the rotary blade is in a schematic diagram of the original position;
FIG. 9 is a schematic view of a second state of the powder supply paving mechanism of the present application in operation; wherein, the powder spreading component is in a stop position, and the rotary blade is in a schematic view of the powder spreading position;
FIG. 10 is a schematic view of a third state of the powder supply paving mechanism of the present application in operation; wherein, part of the powder spreading component moves to the right side of the supply cavity;
FIG. 11 is a schematic view of a fourth state of the powder supply paving mechanism of the present application in operation; wherein the powder spreading component moves to the left side of the supply cavity;
fig. 12 is a flowchart of a powder supply laying method provided in one embodiment of the present application.
Wherein: 100. a powder supply laying mechanism; 200. a printing platform; 300. a powder supply chamber; 1. a supply chamber; 2. a powder transport tool; 3. a powder spreading component; 400. a conveying channel; 11. a discharge port; 111. a first edge portion 1; 112. a second edge portion; 113. an arc-shaped inner wall surface; 21. rotating the blades; 211. a support surface; 31. a bracket; 32. powder spreading rollers; 33. a powder scraping tool; 331. a bottom end portion.
Detailed Description
The following description of the embodiments of the present application will be made apparent with reference to the accompanying drawings, in which embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It should be noted that, the terms "upper", "lower", "left", "right", "transverse", "longitudinal" and the like in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. Furthermore, in the context it will also be understood that when an element is referred to as being connected to another element, it can be directly connected to the other element or be indirectly connected to the other element via intervening elements.
The powder supply laying mechanism and the powder laying control method provided by the embodiment of the application can be applied to additive manufacturing equipment, and the powder used in additive manufacturing can comprise at least one of polymer, metal powder or ceramic powder.
Referring to fig. 1, there is illustrated a powder supply laying mechanism 100, the mechanism 100 being for laying powder onto a printing platform 200 of an additive manufacturing apparatus, in particular transferring powder from a powder chamber 300 out and ultimately onto the printing platform. The powder supply laying mechanism 100 mainly includes a supply chamber 1, a powder transport tool 2, and a powder laying assembly 3.
The supply chamber 1 communicates with the powder supply chamber 300 through the transfer passage 400. The supply chamber 1 is intended to hold powder and has a discharge opening 11 located at the upper part, the discharge opening 11 being located on a first horizontal plane X1 and being able to interface with the printing platform 200. Referring to fig. 2, the tap 11 has opposite first and second edge portions 111 and 112 and an arcuate inner wall surface 113 connecting the first and second edge portions 111 and 112, each of the first and second edge portions 111 and 112 extending in the longitudinal direction. The first edge 111 can interface with the printing platform 200.
A powder transport tool 2 configured to be reciprocally movable between a home position located within the supply chamber 1 and a powder laying position located at the discharge port 11. As further shown in fig. 1, the powder transport tool 2 in this example comprises a rotary blade 21 rotatably arranged in the supply chamber 11, the rotary blade 21 having a support surface 211 capable of supporting said powder, the support surface 211 extending in the longitudinal direction.
As shown in fig. 3, the powder transport tool 2 is in the powder laying position with the rotary blade 21 proximate the first edge portion 111 and the support surface 211 located on the first horizontal plane X1; as shown in fig. 4, the powder transport tool 2 is in the home position, with the rotary blade 21 approaching the second edge portion 112. By means of the rotation of the powder transferring tool 2 between the home position and the powder laying position, the powder in the supply chamber 1 can be continuously carried to the discharge opening 11.
With continued reference to fig. 1, the powder placement assembly 3 is positioned above the discharge port 11 and is capable of being moved laterally (i.e., in a side-to-side direction) between a plurality of positions. The powder spreading assembly 3 comprises a bracket 31, a powder spreading roller 32 arranged on the bracket and a powder scraping tool 33 arranged on the bracket 31. The powder spreading roller 32 can be rotatably arranged on the bracket 31 around the self axis L0, and the powder scraping tool 33 is arranged behind the powder spreading roller 32 along the direction from the printing platform 200 to the supply cavity 1, and when the powder spreading assembly 3 moves from the printing platform 200 to the supply cavity 1, the powder spreading roller 32 reaches above the supply cavity 1 before the powder scraping tool 33; the distance between the doctor blade 33 and the spreader roll 32 in the lateral direction is greater than or equal to the width of the support surface 211 of the rotary blade 21. In other embodiments, the spreader roll may be replaced with other types of spreader tools.
The doctor blade 33 has a bottom end 331, and the bottom end 331 extends in the longitudinal direction and is located on the second horizontal plane X2. The second horizontal plane X2 is above the first horizontal plane X1. The self axis L0 of the powder spreading roller 32 is positioned above the second horizontal plane X2.
The doctor blade 33 is configured to be able to remove excess powder located above the second horizontal plane X2 from the support surface 211 of the powder handling tool located in the powder laying position as the carriage 31 moves laterally. The laying roller 32 is configured to be able to lay powder from the support surface 211 of the powder transport tool 2 located at the laying position onto the printing platform 200 while being moved laterally.
In some embodiments, the doctor blade is provided with a pair of doctor blades to accommodate the situation where a supply chamber is provided on each side of the printing platform. As shown in fig. 5, in this mechanism, a pair of supply chambers 1 are symmetrically provided on both sides of the printing platform 200 in the lateral direction, and a powder transfer tool 2 is provided in each supply chamber 1. A pair of doctor tools 33 are supported on the support 31 and are located on the left and right sides of the spreader roll 32, respectively, and the pair of doctor tools 33 will likewise follow the support 31 and the spreader roll 32 transversely between the two supply chambers 1. The pair of doctor tools 33 is operated such that the doctor tool 33 located on the left side of the spreader roll 32 will perform a function of scraping off surplus powder during the handling of the powder in the supply chamber 1 located on the right side, and the doctor tool 33 located on the right side of the spreader roll 32 will perform a function of scraping off surplus powder during the handling of the powder in the supply chamber 1 located on the left side.
In this solution, the rotating blade 21 only stays at 1 position, i.e. the powder laying position, during the powder transport. As shown in fig. 6, when powdering, the rotary blade 21 is rotated from the start position to the powdering position, and the powder P is supported on the rotary blade 21; as shown in fig. 7, the support 31 is controlled to move so as to remove the excessive powder P2 into the supply chamber 1 by using the powder scraping tool 33 on the support 31, and finally the powder spreading roller 32 conveys the powder P1 of the rotary blade 21 to the printing platform 200 in the opposite direction for powder spreading. In other embodiments, excess powder may be removed into a collection chamber.
In this case, the distance between the first level X1 and the second level X2 defines the amount of powder that can be laid onto the printing platform 200 by the powder laying roller 32, which, because the first level X1 and the second level X2 are relatively fixed in position, makes the amount of powder supplied via the rotary blade 21 substantially constant, so that the thickness of each layer of powder at the time of powder laying is kept substantially uniform.
When a single powder spreading action is started, the powder spreading assembly 3 stays above the supply chamber 1. At this time, the doctor blade 33 on the left side of the holder 31 is positioned on the left side of the supply chamber 1 and the left end face of the rotary blade 21, thereby ensuring that the powder on the rotary blade 21 can be removed back to the supply chamber 1 when the holder 31 moves rightward. The center position of the powder spreading roller 32 is positioned at the right side of the powder pile on the rotary blade 21, so that the powder pile can not touch the powder spreading roller 32 when the rotary blade 21 is positioned at the powder spreading position
In the scheme, the powder supply laying mechanism can be in a symmetrical structure in two directions so as to improve printing efficiency. Only one side of the powder feeding process will be described below:
as shown in fig. 8, before the powder spreading operation starts, the powder spreading unit 3 is in the stay position, the rotary blade 21 is rotated to the original position, and powder is fed from the powder feeding chamber 300 to the feeding chamber 1 through the feeding passage 400.
As shown in fig. 9, when the powder is fed, the rotary blade 21 is rotated clockwise as shown in the drawing to the powder laying position, so that the powder P in the supply chamber 1 is brought to the powder laying position. At this time, the powder pile is at the intermediate position of the doctor blade 33 and the spreader roll 32.
As shown in fig. 10, after the rotary blade 21 has sent the powder to the powder laying position, the powder laying assembly 3 is moved rightward, and during the movement of the powder laying assembly 3, the surplus powder P2 is pushed back to the supply chamber 1 by the doctor blade 33 on the holder 31.
As shown in fig. 11, after removing the excessive powder P2, the powder spreading assembly 3 moves leftward, and the powder spreading roller 32 performs the powder spreading work; the powder P1 is laid on the printing platform 200.
After the powder is laid, the powder laying assembly 3 stays at the stay position of the other side supply cavity 1. Simultaneously, the printing platform 200 moves down by the thickness of the powder layer to prepare for the next powder spreading action.
As shown in fig. 12, the present disclosure further provides a powder supply laying method for transferring and laying powder located in a supply chamber from a discharge port in an upper portion of the supply chamber to a printing platform of an additive manufacturing apparatus, the method comprising:
s1, transferring powder, namely transferring the powder from a supply cavity to a discharge hole, specifically: the powder spreading component is controlled to be positioned at the stop position of the supply cavity, and the powder is conveyed from the supply cavity to the discharge hole by the powder conveying tool capable of moving back and forth between the interior of the supply cavity and the discharge hole, so that the powder conveying tool is kept at the discharge hole, and the powder pile conveyed to the discharge hole by the powder conveying tool is positioned at the middle position of the powder scraping tool and the powder spreading roller.
In this step S1, the powder transport means is not limited to use of the above-mentioned rotating blade type.
S2, removing redundant powder, namely scraping the powder exceeding a set height, wherein the method specifically comprises the following steps: and removing excess powder exceeding a set height from the powder transferring tool by using a powder scraping tool capable of transversely moving above the discharging hole.
In step S2, by controlling the powder spreading assembly to move away from the printing platform, so that the powder scraping tool passes through the powder pile on the powder transferring tool, the powder scraping tool can remove the excessive powder on the powder transferring tool beyond a set height (such as beyond a second horizontal plane height), and the excessive powder can be sent back to the supply cavity or stored in a collecting cavity. The doctor blade is arranged on the support and can also be an independent moving part, and when the doctor blade is arranged as an independent moving part, the doctor blade can be controlled to move towards a direction away from the printing platform in the step without controlling the whole movement of the powder spreading assembly. After step S2 is performed, the powder transfer tool may retain a set dose of powder for powder application.
S3, paving powder, wherein the paving powder comprises the following concrete steps: and transferring and paving at least part of the powder on the powder transferring tool onto the printing platform by using a paving tool capable of transversely moving above the discharging hole.
In this step S3, the direction of the lateral movement of the laying tool is opposite to that of step S2, so that the laying roller pushes the powder remaining on the powder transferring tool to move toward the printing platform, so that the set dose of powder will be uniformly laid on the printing platform.
By executing the method, the powder paved on the printing platform can be basically kept consistent every time, so that the consistency of the powder layer paved on the printing platform is improved.
Claims (10)
1. A powder supply laying mechanism for supplying and laying powder to a print platform of an additive manufacturing apparatus, said powder supply laying mechanism comprising:
a supply chamber for holding powder and having an upper discharge port, said discharge port being located on a first horizontal plane and capable of interfacing with said printing platform;
a powder transport tool configured to be reciprocally movable between a home position within the supply chamber and a powder placement position at the discharge port; and
a powder spreading assembly located above the discharge port and capable of moving laterally, the powder spreading assembly comprising a bracket, a powder spreading tool mounted on the bracket, and a powder scraping tool, the at least one powder scraping tool being configured to remove excess powder located above a second level from the powder transferring tool located at the powder spreading position when moving laterally, the second level being above the first level, the powder spreading roller being configured to transfer and spread powder from the powder transferring tool located at the powder spreading position to the printing platform when moving laterally.
2. The powder supplying and laying mechanism according to claim 1, wherein the powder laying tool includes a powder laying roller rotatably provided on the bracket around its own axis.
3. A powder supplying and laying mechanism according to claim 2, wherein the number of the powder scraping tools is one, and a pair of the powder scraping tools are supported on the bracket and are located on both sides of the powder laying roller in the lateral direction, respectively.
4. A powder supply laying mechanism according to claim 1, wherein the self axis of the powder laying roller is located above the second horizontal plane.
5. A powder feed mechanism as defined in claim 1, wherein the powder scraping tool has a bottom end portion extending longitudinally and located at the second level.
6. A powder supply paving mechanism of claim 1, wherein the powder transport tool includes a rotary blade rotatably disposed within the supply cavity, the rotary blade having a support surface capable of supporting the powder, the support surface extending longitudinally; the support surface is positioned at the first level when the powder handling tool is in the powder laying position.
7. The powder supply paving mechanism of claim 6, wherein the spout has opposed first and second edge portions, the first edge portion being configured to interface with the printing platform; when the powder transferring tool is at the original position, the rotating blade is close to the second edge part.
8. A powder supply laying method for transferring and laying powder located in a supply chamber from a discharge port in an upper portion of the supply chamber to a printing platform of an additive manufacturing apparatus, the method comprising:
transporting powder from said supply chamber to said discharge port by means of a powder transport tool reciprocally movable between said supply chamber interior and said discharge port and retaining said powder transport tool at said discharge port;
removing excess powder from the powder transfer tool beyond a set height by means of a powder scraping tool capable of moving laterally over the discharge port; and
and transferring and paving at least part of the powder on the powder transferring tool onto the printing platform by using a paving tool capable of transversely moving above the discharging hole.
9. The method of claim 8, wherein the removed excess powder is returned to the supply chamber or transferred to a collection chamber.
10. The method of claim 8 wherein said doctor blade is moved in a direction transverse to the direction of movement of said laying tool when removing excess said powder and when transferring and laying at least a portion of said powder to said printing platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410044344.6A CN117734168A (en) | 2024-01-12 | 2024-01-12 | Powder supply laying mechanism and powder supply laying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410044344.6A CN117734168A (en) | 2024-01-12 | 2024-01-12 | Powder supply laying mechanism and powder supply laying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117734168A true CN117734168A (en) | 2024-03-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410044344.6A Pending CN117734168A (en) | 2024-01-12 | 2024-01-12 | Powder supply laying mechanism and powder supply laying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117734168A (en) |
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2024
- 2024-01-12 CN CN202410044344.6A patent/CN117734168A/en active Pending
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