阅读说明：本技术 用于三维物体制造的变速铺粉方法、设备及可读存储介质 (Variable speed powder laying method, apparatus and readable storage medium for three-dimensional object manufacturing ) 是由 司妞 梁冬生 林江波 于 2020-05-28 设计创作，主要内容包括：一种用于三维物体制造的变速铺粉方法、设备及可读存储介质,其中该方法包括该方法包括：在建造阶段,获取当前层铺粉装置移动的所有区域并将其划分为送粉区域和铺粉区域,在送粉区域采用第一速度进行送粉,在铺粉区域采用第二速度进行铺粉,铺粉区域为铺粉装置将当前层的粉末铺送至成型缸的工作区域时最先需经过的一极限边界与当前层的区域划分线的区域,送粉区域为铺粉装置在当前层中除了铺粉区域外所有移动的区域；其中当前层的区域划分线通过以下方式获取：对建造包工件进行切片处理,获取每一层的切片信息；根据当前层的切片信息确定当前层的区域划分线。本发明不仅保证了铺粉质量,而且进一步提高了铺粉效率,从而提高了设备的生产效率。(A variable speed powder laying method, apparatus and readable storage medium for three-dimensional object fabrication, wherein the method comprises: in the construction stage, all moving areas of the powder paving device on the current layer are obtained and divided into a powder feeding area and a powder paving area, powder is fed in the powder feeding area at a first speed, powder is paved in the powder paving area at a second speed, the powder paving area is an area of a dividing line between a limit boundary which the powder paving device needs to pass through at first and the area of the current layer when the powder paving device paves the powder on the current layer to a working area of a forming cylinder, and the powder feeding area is an area where the powder paving device moves except the powder paving area in the current layer; the region dividing line of the current layer is obtained by the following method: slicing the building packet workpiece to obtain slice information of each layer; and determining the region dividing line of the current layer according to the slice information of the current layer. The invention not only ensures the powder paving quality, but also further improves the powder paving efficiency, thereby improving the production efficiency of equipment.)

1. A variable speed dusting method for three-dimensional object manufacturing, comprising the steps of:

in the construction stage, all moving areas of the powder paving device on the current layer are obtained and divided into a powder feeding area and a powder paving area, powder is fed in the powder feeding area at a first speed, powder is paved in the powder paving area at a second speed, the powder paving area is an area of a limit boundary which is firstly required to pass when the powder paving device paves the powder on the current layer to a working area of a forming cylinder and an area dividing line of the current layer, and the powder feeding area is an area where the powder paving device moves except the powder paving area in the current layer; the region dividing line of the current layer is obtained by the following method:

slicing the building packet workpiece to obtain slice information of each layer;

and determining the region dividing line of the current layer according to the slice information of the current layer.

2. The variable speed powder coating method for three-dimensional object fabrication as recited in claim 1, wherein determining the region dividing line of the current layer based on the slice information of the current layer specifically comprises:

acquiring a to-be-sintered section formed by all the to-be-scanned workpieces in a working area on a forming cylinder through the slice information of the current layer;

and acquiring a boundary line which is far away from the powder spreading device on the section to be sintered, needs to pass through a limit boundary firstly when the powder of the current layer is spread to the working area of the forming cylinder and is parallel to the limit boundary, wherein the boundary line is a division line of the current layer.

3. The variable speed dusting method for three dimensional object manufacturing according to claim 1 whereby the first speed is a non-fixed value, the second speed is a fixed value and the initial value of the first speed is greater than the initial value of the second speed.

4. A variable speed dusting method for three dimensional object manufacturing as claimed in claim 3 characterised in that the method further comprises:

detecting and judging whether powder throwing exists during powder spreading of the powder spreading device in real time;

when powder throwing exists, the first speed is controlled to be reduced, and the powder throwing device continues to detect and judge whether powder throwing exists during powder spreading of the powder spreading device; otherwise, the powder feeding is continued at the first speed.

5. The variable speed dusting method for three dimensional object manufacturing as claimed in claim 4 whereby said controlling the first speed reduction is a 5-10% reduction of the first speed.

6. A variable speed powder laying method for three-dimensional object fabrication as claimed in any of claims 1 to 5, further comprising a pre-heating stage and a cooling stage, the powder laying device moving at a third speed during the pre-heating stage and the powder laying device moving at a fourth speed during the cooling stage, the third and fourth speeds being greater than the second speed.

7. The variable speed powder laying method for three-dimensional object fabrication of claim 6, wherein the third speed is equal to the fourth speed.

8. A rapid printing apparatus for three-dimensional objects comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the variable speed powder laying method for three-dimensional object manufacturing of any one of claims 1 to 7.

9. A readable storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, realizes the steps of the variable speed dusting method for three-dimensional object manufacturing of any of the claims 1 to 7.

Technical Field

The invention relates to the technical field of three-dimensional object manufacturing, in particular to a variable-speed powder laying method and device for three-dimensional object manufacturing and a readable storage medium.

Background

The selective laser melting technology as one of the additive manufacturing technologies comprises the following basic processes: the powder supply cylinder is raised by one layer thickness to send a certain amount of powder to a working area, the forming cylinder is lowered by one layer thickness, the powder spreading device spreads a layer of powder material on the upper surface of a substrate of the forming cylinder or a formed part, and the vibrating mirror system controls the laser to scan the powder layer of the solid part according to the section outline of the layer, so that the powder is melted and is bonded with the formed part below. The above steps are repeated until several layers of scans are superimposed to complete the entire prototype fabrication.

In the operation process of the equipment, powder is spread at a single speed generally, and the speed is not too fast in order to ensure the powder spreading quality, so that the powder spreading time is too long, the production efficiency is reduced, and the quick development of 3D printing is not facilitated.

Disclosure of Invention

Based on the method, the device and the readable storage medium, the powder paving quality is guaranteed, and the powder paving efficiency is improved.

A variable speed dusting method for three-dimensional object manufacturing, comprising the steps of:

in the construction stage, all moving areas of the powder paving device on the current layer are obtained and divided into a powder feeding area and a powder paving area, powder is fed in the powder feeding area at a first speed, powder is paved in the powder paving area at a second speed, the powder paving area is an area of a limit boundary which is firstly required to pass when the powder paving device paves the powder on the current layer to a working area of a forming cylinder and an area dividing line of the current layer, and the powder feeding area is an area where the powder paving device moves except the powder paving area in the current layer; the region dividing line of the current layer is obtained by the following method:

slicing the building packet workpiece to obtain slice information of each layer;

and determining the region dividing line of the current layer according to the slice information of the current layer.

As a further preferable aspect of the present invention, the determining the region dividing line of the current layer according to the slice information of the current layer specifically includes:

acquiring a to-be-sintered section formed by all the to-be-scanned workpieces in a working area on a forming cylinder through the slice information of the current layer;

and acquiring a boundary line which is far away from the powder spreading device on the section to be sintered, needs to pass through a limit boundary firstly when the powder of the current layer is spread to the working area of the forming cylinder and is parallel to the limit boundary, wherein the boundary line is a division line of the current layer.

In a further preferred embodiment of the present invention, the first speed is a non-fixed value, the second speed is a fixed value, and an initial value of the first speed is larger than an initial value of the second speed.

As a further preferable aspect of the present invention, the method further comprises:

detecting and judging whether powder throwing exists during powder spreading of the powder spreading device in real time;

when powder throwing exists, the first speed is controlled to be reduced, and the powder throwing device continues to detect and judge whether powder throwing exists during powder spreading of the powder spreading device; otherwise, the powder feeding is continued at the first speed.

As a further preferable aspect of the present invention, the controlling of the first speed reduction means reducing the first speed by 5% to 10%.

As a further preferable scheme of the present invention, the method further includes a preheating stage and a cooling stage, the powder spreading device moves at a third speed in the preheating stage, and the powder spreading device moves at a fourth speed in the cooling stage, and both the third speed and the fourth speed are greater than the second speed.

As a further preferable aspect of the present invention, the third speed is equal to the fourth speed.

A variable speed powder laying apparatus for three-dimensional object manufacturing comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of any of the above-described variable speed powder laying methods for three-dimensional object manufacturing when executing the computer program.

A readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the steps of any of the above-described variable speed powder laying methods for three-dimensional object manufacturing.

The invention discloses a variable-speed powder paving method, equipment and a readable storage medium for manufacturing a three-dimensional object, wherein the area dividing line of a current layer is determined by slicing information of the current layer, the area of a limit boundary which is firstly required to pass when powder of the current layer is paved to a working area of a forming cylinder and the area of the area dividing line of the current layer is determined as a powder paving area by a powder paving device, the rest area is used as a powder feeding area, and different speeds are adopted for the powder paving area and the powder feeding area to carry out powder paving, so that the powder paving quality is ensured, the powder paving efficiency is further improved, and the production efficiency of the equipment is improved.

Drawings

FIG. 1 is a schematic diagram of the operation provided by a conventional three-dimensional object manufacturing apparatus;

FIG. 2 is a schematic operational view of one embodiment of a variable speed powder laying method for three-dimensional object fabrication of the present invention;

FIG. 3 is a first schematic operating diagram of another embodiment of a variable speed powder laying method for three-dimensional object fabrication of the present invention;

fig. 4 is a second schematic operation diagram of another embodiment of the variable speed powder laying method for three-dimensional object manufacturing according to the present invention.

In the drawings, the reference numbers:

1. powder spreading device, 2, powder supply area, 3, forming area, 4, powder return area.

Detailed Description

In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the additive manufacturing technology, in order to better control the movement stroke of the powder spreading device 1, limit boundaries (A, B in fig. 1-4 is the limit boundaries on both sides of the forming cylinder 3) are generally provided on both sides of the forming cylinder 3, specifically, the limit boundaries on both sides of the forming cylinder 3 refer to limit positions located on both sides of the forming cylinder 3, which are respectively at a certain distance from the edge of the forming cylinder 3, for example, the distance may be 0-1cm, although specific values thereof may be specifically set according to design needs, and are not limited herein.

The working schematic diagram provided by the conventional three-dimensional object manufacturing apparatus is shown in fig. 1, and the working area (i.e. the area between a and B in fig. 1) on the forming cylinder 3 is generally spread with a fixed speed, but the speed is not too fast to ensure the spreading quality, so that the spreading time is too long, i.e. the production efficiency of the apparatus is reduced, and the rapid development of 3D printing is not facilitated. In actual printing, the to-be-sintered section of the to-be-printed workpiece does not occupy the whole working area, as shown in fig. 2 to 4, the to-be-sintered section may only occupy about half of the working area, so that if the powder is fed and spread at a slower speed in the whole working area, the powder spreading efficiency of the equipment is greatly influenced.

In order to solve the above technical problems, the present invention provides a variable speed powder laying method for three-dimensional object manufacturing, the method comprising the steps of:

in the construction stage, all moving areas of the powder paving device 1 on the current layer are obtained and divided into a powder feeding area and a powder paving area, powder is fed in the powder feeding area at a first speed, powder is paved in the powder paving area at a second speed, the powder paving area is an area of a dividing line between a limit boundary which the powder paving device 1 needs to pass through at first and the area of the current layer when paving the powder of the current layer to a working area of the forming cylinder 3, and the powder feeding area is an area where the powder paving device 1 moves except the powder paving area in the current layer; the region dividing line of the current layer is obtained by the following method:

slicing the building packet workpiece to obtain slice information of each layer;

and determining the region dividing line of the current layer according to the slice information of the current layer.

Specifically, determining the region dividing line of the current layer according to the slice information of the current layer specifically includes:

acquiring a to-be-sintered section formed by all the to-be-scanned workpieces in a working area on the forming cylinder 3 according to the slice information of the current layer;

and acquiring a boundary line which is far away from the powder spreading device 1 on the section to be sintered, firstly passes through a limit boundary when the powder of the current layer is spread to the working area of the forming cylinder 3 and is parallel to the limit boundary, wherein the boundary line is a division line of the current layer.

Specifically, the first speed and the second speed may both be fixed values, and the first speed is greater than the second speed; preferably, however, the first speed is a non-fixed value, the second speed is a fixed value, and the initial value of the first speed is greater than the initial value of the second speed, the method further includes:

detecting and judging whether powder throwing exists or not when the powder spreading device 1 spreads powder in real time; because preheating temperature is on the high side probably makes the powder produce the caking phenomenon, then can produce when spreading powder device 1 tiling powder and get rid of the powder problem, what get rid of here gets rid of the powder and can be judged by the designer, because the judgement process who gets rid of the powder belongs to prior art, therefore does not describe here in detail to it. Of course, in particular implementations, if the powder state is good, the problem of powder dumping may not occur.

When powder throwing exists, the first speed is controlled to be reduced, and the powder throwing device continues to detect and judge whether powder throwing exists during powder spreading of the powder spreading device 1; otherwise, the powder feeding is continued at the first speed. It should be noted that, the first speed is maintained to continue the powder spreading, and the first speed refers to a speed value updated in real time, for example, when the initial value of the first speed is 180 m/s, after a plurality of times, the first speed is reduced to 100m/s at a time before the current time, if the current time determines that there is no powder throwing problem, the first speed of 100m/s is maintained at the current time, and so on. Specifically, the controlling of the first speed reduction means reducing the first speed by 5% -10%, and of course, the reduction range may also be specifically set according to specific requirements. The optimal selection method can improve the powder spreading efficiency and further ensure the powder spreading quality.

The variable-speed powder laying method for manufacturing the three-dimensional object can be applied to unidirectional powder feeding (as shown in figure 2) and bidirectional powder feeding (as shown in figures 3 and 4), and the method is respectively specifically explained as follows:

as shown in fig. 2, the method includes: in the construction stage, all the areas where the powder paving device 1 on the current layer moves are obtained and divided into a powder feeding area and a powder paving area, the powder feeding area is used for feeding powder at a first speed, the powder paving area is used for paving powder at a second speed, the powder paving area is an area (shown as C in figure 2) of a division line between a limit boundary (shown as B in figure 2) which is firstly required to pass when the powder paving device 1 paves the powder on the current layer to a working area of the forming cylinder 3 and an area (shown as C in figure 2) of an area division line of the current layer, and the powder feeding area is an area (including a right limit position-B of the powder feeding area 2, a left limit position of the forming area 3 and a right limit position of the powder feeding area 2 in figure 2) where the powder paving device 1 moves in the current layer except the powder paving area. And the next layer is sent and spread powder according to the current layer until the sintering of the workpiece to be printed is finished.

Fig. 3 and 4 respectively show the powder feeding and spreading of two adjacent layers (including the powder spreading device 1 feeding the powder from right to left and the powder spreading device 1 feeding the powder from left to right). The method comprises the following steps: in the construction stage, all areas where the powder paving device 1 on the current layer moves are obtained and divided into a powder feeding area and a powder paving area, powder is fed in the powder feeding area at a first speed, and powder is paved in the powder paving area at a second speed. As shown in fig. 3, the powder spreading area is an area (e.g., C in fig. 3) which is a dividing line between a limit boundary (e.g., B in fig. 3) which the powder spreading device 1 needs to pass first when spreading the powder of the current layer to the working area of the forming cylinder 3 and the area of the current layer, and the powder feeding area is an area (including right limit position-B and left limit position-C of powder returning area 4 in fig. 3) in which the powder spreading device 1 moves in the current layer except for the powder spreading area; as shown in fig. 4, the powder spreading area is an area (e.g., C in fig. 4) which is a dividing line between a limit boundary (e.g., a in fig. 4) which the powder spreading device 1 needs to pass first when spreading the powder of the current layer to the working area of the forming cylinder 3 and the area of the current layer, and the powder feeding area is an area (including a left limit position-a and a right limit position-C of the powder feeding area 2 and a powder returning area 4 in fig. 4) in which the powder spreading device 1 moves in the current layer except for the powder spreading area. And the powder feeding and spreading of other layers is executed according to the current layer step until the sintering of the workpiece to be printed is finished.

It should be noted that, the left limit position of the powder supply area 2 and the right limit position of the powder supply area 2 both refer to the areas where the limit positions on both sides of the powder supply cylinder 2 correspond to the straight line where the powder spreading device 1 moves, the left limit position of the powder return area 4 and the right limit position of the powder return area 4 both refer to the areas where the limit positions on both sides of the powder return groove 4 correspond to the straight line where the powder spreading device 1 moves, and the forming area refers to the area where the forming cylinder corresponds to the straight line where the powder spreading device 1 moves, which belongs to the general technical term in the art. In addition, the powder feeding cylinder and the powder returning groove are arranged in the three-dimensional object manufacturing equipment shown in fig. 3 and 4 to realize bidirectional powder paving, but in specific implementation, the equipment can also comprise two powder feeding cylinders 2, and the method is also applicable, and only the powder returning area in fig. 3 and 4 needs to be replaced by the powder feeding area.

As a further preferable scheme of the present invention, when the apparatus is a nylon apparatus, the method further includes a preheating stage and a cooling stage, the powder spreading device 1 moves at a third speed in the preheating stage, and the powder spreading device 1 moves at a fourth speed in the cooling stage, and both the third speed and the fourth speed are greater than the second speed. The preheating stage is that the powder spreading device 1 spreads the powder to a powder bed, and the powder is heated by the radiant heat of a heating pipe at the upper part of the powder bed; the cooling stage is that after the workpiece to be printed is sintered, powder with a certain height needs to be paved on the sintered workpiece to preserve heat of the sintered workpiece.

In particular, said third speed and said fourth speed may be different, although it is preferred that said third speed is equal to said fourth speed, which facilitates the operational control.

It should be noted that, the variable speed powder spreading method and the variable speed powder spreading apparatus for manufacturing a three-dimensional object according to the present invention are also applicable to a 3D printing apparatus including a powder overflow cylinder, if the powder overflow cylinder is disposed on a side of the powder supply cylinder 2 or the powder return tank 4 away from the forming cylinder 3, taking a double powder overflow cylinder as an example, the powder spreading area is the same as a powder spreading apparatus without the powder overflow cylinder, that is, an area (e.g., C) of a division line between a limit boundary (e.g., B) that the powder spreading device 1 needs to pass first when spreading the powder of a current layer to a working area of the forming cylinder 3 and an area of the current layer; the powder feeding area is an area where the powder spreading device 1 moves in the current layer except the powder spreading area (including a limit position B and C of a powder overflowing area far from the powder supplying area 2 or the powder returning area 4 and a limit position of another powder overflowing area far from the powder supplying area 2 or the powder returning area 4), and the powder feeding area of the single powder overflowing cylinder refers to the double powder overflowing cylinders, which is not described in detail in the invention. It should be noted that the limit positions on both sides of the powder overflowing area refer to the area where the limit positions on both sides of the powder overflowing cylinder correspond to the straight line where the powder spreading device 1 moves.

The invention further provides a variable-speed powder paving device for manufacturing the three-dimensional object, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of any one of the variable-speed powder paving methods for manufacturing the three-dimensional object when executing the computer program.

Another embodiment of the present invention also provides a readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the above-described variable speed powder laying methods for three-dimensional object manufacturing.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.