CN109226759B

CN109226759B - Scanning path setting method and device for powder-spreading type laser 3D printing and control equipment

Info

Publication number: CN109226759B
Application number: CN201811240611.8A
Authority: CN
Inventors: 邱铖; 何建宏; 甘杰家; 龙雨; 陈根余; 陈焱; 高云峰
Original assignee: Han s Laser Technology Industry Group Co Ltd; Hans Laser Smart Equipment Group Co Ltd
Current assignee: Tianjin Han's Intelligent Equipment Co.,Ltd.; Han s Laser Technology Industry Group Co Ltd
Priority date: 2018-10-23
Filing date: 2018-10-23
Publication date: 2020-07-10
Anticipated expiration: 2038-10-23
Also published as: CN109226759A

Abstract

The invention relates to a scanning path setting method, a scanning path setting device, control equipment and a storage medium for a powder laying type laser 3D printing system, wherein the method comprises the following steps: the method comprises the steps of obtaining an initial scanning angle of a scanning path, calculating the scanning angle of each layer of workpiece slices of a workpiece according to the initial scanning angle and the set scanning angle variation, finally setting the scanning path according to the obtained scanning distance and the scanning angle of each layer of workpiece slices, enabling the scanning path between different layers to change according to the angle variation, enabling the scanning angles between adjacent layers to be different, effectively dispersing thermal stress of adjacent layers, avoiding deformation of the workpiece caused by the fact that the adjacent layers of scanning paths are overlapped to lead to the thermal stress to be excessively concentrated and shrunk, reducing the shrinkage of surface stress in the process of melting to solidification, enhancing the stability of a printed piece, and improving the operation quality of the powder-spreading type laser 3D printing system.

Description

Scanning path setting method and device for powder-spreading type laser 3D printing and control equipment

Technical Field

The invention relates to the technical field of laser 3D printing, in particular to a scanning path setting method, a scanning path setting device, control equipment of a powder-laying type laser 3D printing system and a computer readable storage medium.

Background

With the rapid development of scientific technology, the laser 3D printing technology is rapidly applied to various industries, is mainly used for printing various workpieces, improves the industrial production efficiency and saves energy.

In the laser 3D printing process, a scanning path of the laser 3D printing system needs to be set, and the setting of the scanning path has a great influence on the part forming effect, for example, different scanning filling modes when printing a solid body have great influence on the precision and physical quantity performance of a formed part. In the conventional technology, the scanning path setting method comprises vertical scanning, horizontal scanning, orthogonal scanning, profile offset and the like, however, for the powder-laying type laser 3D printing technology, since the metal material is extremely easy to be heated and deformed and is easy to shrink into balls due to surface stress in the process from melting to solidification, the scanning path setting method of the conventional technology is easy to cause thermal deformation of the metal material in the printing process of the powder-laying type laser 3D printing system, and the stability of a printed product is reduced.

Disclosure of Invention

Based on this, it is necessary to provide a scan path setting method, a scan path setting device, a control device of a powder-laying laser 3D printing system, and a computer-readable storage medium, for solving the technical problems that the conventional technology easily causes thermal deformation of a metal material during printing of the powder-laying laser 3D printing system, and reduces the stability of a printed product.

A scan path setting method for setting a scan path of a powder laying type laser 3D printing system includes the steps:

acquiring an initial scanning angle of a scanning path; the scanning path is used for filling the powder spreading type laser 3D printing system into a workpiece;

calculating the scanning angle of each layer of workpiece slice of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein the scanning angles of the workpiece slices of adjacent layers are different;

acquiring the scanning distance of the scanning path; and setting the scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices.

A scan path setting device for setting a scan path of a powder laying laser 3D printing system, comprising:

the angle acquisition module is used for acquiring an initial scanning angle of the scanning path; the scanning path is used for filling the powder spreading type laser 3D printing system into a workpiece;

the angle calculation module is used for calculating the scanning angle of each layer of workpiece slice of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein the scanning angles of the workpiece slices of adjacent layers are different;

the path setting module is used for acquiring the scanning distance of the scanning path; and setting the scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices.

A control apparatus for a powder-laid laser 3D printing system, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:

calculating the scanning angle of each layer of workpiece slice of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein, the scanning angles of the workpiece slices of adjacent layers are different;

acquiring the scanning distance of the scanning path; setting the scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices; and controlling the laser and the scanning galvanometer through the galvanometer control card according to the scanning path so that the laser emitted by the laser scans the workpiece on the workbench.

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

The scanning path setting method, the scanning path setting device, the control equipment and the storage medium acquire the initial scanning angle of the scanning path, calculate the scanning angle of each layer of workpiece slices of the workpiece according to the initial scanning angle and the set scanning angle variation, and finally set the scanning path according to the acquired scanning distance and the scanning angle of each layer of workpiece slices, so that the scanning paths among different layers are changed according to the angle variation, and the scanning angles among adjacent layers are different, the thermal stress of adjacent layers can be effectively dispersed, the deformation of the workpiece caused by the over-concentrated shrinkage of the thermal stress due to the overlapping of the scanning paths of adjacent layers is avoided, the shrinkage of the surface stress in the process of melting to solidification is reduced, the stability of a printed product is enhanced, and the operation quality of the powder-spread type laser 3D printing system is also improved.

Drawings

FIG. 1 is a diagram of an exemplary embodiment of a scan path setting method;

FIG. 2 is a flowchart illustrating a scan path setting method according to an embodiment;

FIG. 3 is a schematic diagram of a scan path in one embodiment;

FIG. 4 is a schematic illustration of a slicing process performed on a workpiece in one embodiment;

FIG. 5 is a schematic illustration of a strip region in one embodiment;

FIG. 6 is a schematic view showing the position of a lateral air-blowing unit in one embodiment;

FIG. 7 is a diagram of a sub-graph of the calculation of a scan path in one embodiment;

FIG. 8 is a schematic diagram of a circumscribed rectangular area fill scan path in one embodiment;

FIG. 9(a) is a schematic diagram of a scan path circumscribing a rectangular region in one embodiment;

FIG. 9(b) is a schematic view of the scan path of the print zone in one embodiment;

FIG. 10 is a block diagram showing the construction of a scan path setting apparatus according to an embodiment;

fig. 11 is an internal configuration diagram of the control device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The scan path setting method provided by the present invention can be applied to the application environment shown in fig. 1, where fig. 1 is an application environment diagram of the scan path setting method in an embodiment, and includes: the control device 100 of the powder laying type laser 3D printing system, a laser 201, a galvanometer control card 202 and a scanning galvanometer 203. The user can send a control signal to the laser 201 by using the control device 100 to control the laser 201 to emit laser to the scanning galvanometer 203, and send a control signal to the galvanometer control card 202 by using the control device 100 to control the scanning galvanometer 203 through the galvanometer control card 202, so that the scanning galvanometer 203 swings under the control of the control device 100, the laser emitted by the laser 201 is irradiated on a workpiece 205 of a workbench 204 of the powder laying type laser 3D printing system, and the workpiece 205 is subjected to filling scanning according to a set scanning path to print and form the workpiece 205. The control device 100 may be implemented by a personal computer, a tablet computer, or the like.

In an embodiment, a scan path setting method is provided, referring to fig. 2, fig. 2 is a schematic flowchart of the scan path setting method in an embodiment, which is described by taking the method as an example for being applied to the control device 100 in fig. 1, and the scan path setting method may include the following steps:

step S101, an initial scanning angle of the scanning path is acquired.

Before the powder laying type laser 3D printing system fills the workpiece, a scanning path needs to be set, the scanning path refers to a scanning path of the powder laying type laser 3D printing system for filling the workpiece, and the scanning path is described by a cube workpiece, as shown in fig. 3, fig. 3 is a schematic diagram of the scanning path in an embodiment, before the square workpiece 300 is printed on the worktable 204, the scanning path of the square workpiece 300 needs to be set, and a plurality of scanning paths are generally required to be set for filling the workpiece, in order to improve the setting efficiency of the scanning path, the scanning paths are generally parallel straight lines, as shown by an arrow 310 in fig. 3, one of the scanning paths of the square workpiece 300, and the powder laying type laser 3D printing system can scan and fill the square workpiece 300 according to the scanning path, wherein the scanning path has a certain scanning angle, as shown by the scanning path indicated by the arrow 310, in practical applications, the worktable 204 is generally rectangular, so that one of the worktable 204a reference line edge 204a is used as a scanning path, and the scanning path is set in advance as a scanning angle, and the scanning path is set by a user as a scanning angle, if the scanning path is different from the scanning path, and the scanning path is set in advance as a scanning angle, and the scanning path is set as a scanning angle of the scanning path included angle of the scanning path is different from the scanning path indicated by the scanning path β.

And S102, determining the scanning angle of each layer of workpiece slice of the workpiece according to the set scanning angle variation and the initial scanning angle.

In this step, the scan angle variation is mainly used to change the scan angle of each layer of workpiece slices of the workpiece. Before setting the scanning angles of the workpiece slices of each layer of the workpiece, the workpiece may be sliced, referring to fig. 4, where fig. 4 is a schematic diagram of slicing the workpiece in one embodiment, and a square workpiece 400 is used to describe the slicing process, first, a user may slice the square workpiece 400 from a cross section of the square workpiece 400 according to a set thickness to obtain a workpiece slice 410, where the workpiece slice 410 has a contour portion 411 and a portion to be filled 412, and then the user may set a scanning path 413 in the portion to be filled 412.

Since the workpiece to be printed is usually sliced into a plurality of layers of workpiece slices, the scanning angle of the scanning path of each layer of workpiece slices needs to be set, specifically, after the workpiece is sliced into a plurality of layers of workpiece slices, the scanning angle of the workpiece slices of different layers can be set in a layer-by-layer changing manner by using the initial scanning angle as the initial value of the scanning angle of each layer of workpiece slices, and the specific value of the scanning angle of each layer of workpiece slices can be set without limitation as long as the scanning angles between adjacent layers of workpiece slices are different, assuming that the bottommost slice of the workpiece is the first layer of workpiece slice, and sequentially the second layer of workpiece slice, the third layer of workpiece slice, … … and the nth layer of workpiece slice, the initial scanning angle can be set as the scanning angle of the first layer of workpiece slice, and the second layer can be set as the scanning angle obtained by adding the scanning angle variation to the initial scanning angle, the third layer increases the scanning angle variation amount based on the scanning angle of the second layer workpiece slice, and the scanning angle variation amount can be an increase amount or a decrease amount, then the setting of the scanning angle of each layer of workpiece slices is completed in sequence, as long as the scanning angle between the adjacent layer of workpiece slices is different, for example, the scanning angle of the N-1 layer of working slices is 50 degrees, as long as the scan angle of the N-2 and N-layer workpiece slices is not 50 degrees, this is done to take into account that, in the actual 3D printing process, thermal stresses of the adjacent layers may affect each other, the scanning angles of all layers of workpiece slices are set through the scanning angle variable quantity and the initial scanning angle, so that the deformation of the surface of a printed workpiece caused by the concentrated contraction of thermal stress due to the overlapping of the scanning angles between adjacent layers of workpiece slices can be prevented.

Step S103, acquiring the scanning distance of the scanning path; and setting a scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices.

In this step, the scanning path of the powder-spreading laser 3D printing system for filling the workpiece generally includes a plurality of scanning paths, and a certain scanning interval is provided between the scanning paths, and in this step, the scanning interval between the scanning paths of each layer of workpiece slices can be obtained, and then each scanning path of each layer of workpiece slices is respectively set according to the scanning interval between the scanning paths of each layer of workpiece slices and the scanning angle of each layer of workpiece slices. Wherein, if the scanning route that adopts includes many scanning routes that are parallel to each other, and the scanning interval between each scanning route is fixed value, then can carry out the scanning route of filling to each layer work piece section of this work piece according to the scanning interval and each layer work piece sliced scanning angle setting, because the scanning angle of the scanning route of adjacent layer work piece is inequality, the scanning route of adjacent layer work piece also does not overlap moreover to can effectively prevent to avoid printing work piece surface deformation that thermal stress concentrates the shrink and leads to because the scanning angle overlap between adjacent layer work piece section.

According to the scanning path setting method, the initial scanning angle of the scanning path is obtained, the scanning angle of each layer of workpiece slices of the workpiece is calculated according to the initial scanning angle and the set scanning angle variation, the scanning path is finally set according to the obtained scanning distance and the scanning angle of each layer of workpiece slices, the scanning path between different layers is changed according to the angle variation, and the scanning angles between adjacent layers are different, so that the thermal stress of adjacent layers can be effectively dispersed, the phenomenon that the thermal stress is too concentrated and shrunk to cause deformation of the workpiece due to overlapping of the scanning paths of adjacent layers is avoided, the shrinkage of the surface stress in the process of melting to solidification is reduced, the stability of a printed piece is enhanced, and the operation quality of the powder-spreading type laser 3D printing system is also improved.

In one embodiment, the step of calculating the scanning angle of each layer of the workpiece slice of the workpiece according to the set scanning angle variation and the initial scanning angle may include:

in step S201, a workpiece is sliced to obtain a multilayer workpiece slice.

The step is mainly to slice a workpiece to obtain a multi-layer workpiece slice of the workpiece, generally speaking, a user can extract the workpiece slice on a cross section of the workpiece according to a set thickness, and the value range of the thickness is generally 0.02 to 0.05 mm.

And S202, setting the scanning angle of the first-layer workpiece slice according to the initial scanning angle.

The first-layer workpiece slice refers to a slice of the bottommost layer of the workpiece, namely a workpiece slice where a surface of the workpiece, which is in contact with the workbench, is located.

In step S203, the scan angle variation amount is determined.

The step is mainly to determine the variation of the scanning angle, which can be set by the user according to the actual situation.

And S204, determining the scanning angles of the rest layers of workpiece slices in a layer-by-layer increasing mode according to the scanning angle variation and the scanning angle of the first layer of workpiece slices.

Specifically, assuming that the scanning angle of the scanning path of the first layer of workpiece slices is α, the scanning angle of the second layer of workpiece slices can be increased by a scanning angle variation Δ α 0 on the basis of α to obtain a scanning angle of α + Δ α for the second layer of workpiece slices, a scanning angle of α +2 × Δ α for the third layer of workpiece slices, a scanning angle of α + (N-1) × Δ α for the nth layer of workpiece slices of … …, and so on, the scanning angles of the scanning paths of the workpiece slices of each layer are set.

This embodiment is carried out the section to the work piece and is handled and obtain multilayer work piece section, sets up the sliced scanning angle of first floor work piece according to initial scanning angle again to scanning angle variation and the sliced scanning angle of first floor work piece according to the user setting for loop through the mode that the successive layer increases progressively obtains the sliced scanning angle of each layer work piece, under the circumstances that the sliced scanning route of guaranteeing adjacent layer work piece is not coincident, can also accomplish the sliced setting to each layer work piece fast, has improved the setting efficiency of scanning route.

In one embodiment, after the step of slicing the workpiece to obtain the multi-layer workpiece slices, the method may further include:

and dividing each layer of workpiece slice into a plurality of strip areas.

In this embodiment, after slicing a workpiece to obtain multiple layers of workpiece slices, each layer of workpiece slice may be divided into multiple stripe regions, and the stripe regions may be divided by multiple straight lines parallel to each other at equal intervals, referring to fig. 5, where fig. 5 is a schematic diagram of the stripe regions in one embodiment, for a square workpiece slice 500, a square workpiece slice 500 may be divided into 5 stripe regions by multiple solid lines parallel to each other at equal intervals in the square workpiece slice 500, as indicated by a first stripe region indicated by an arrow 510, a second stripe region indicated by an arrow 520, a third stripe region indicated by an arrow 530, a fourth stripe region indicated by an arrow 540, and a fifth stripe region indicated by an arrow 550, it can be understood that a user may divide a specific number of stripe regions according to actual needs, and the number of stripe regions is generally equal to the breadth size of the workpiece, The set pitch of the strip is related to the set angle of the strip.

The embodiment divides each layer of workpiece slices of the workpiece into a plurality of strip areas respectively, so that a user can set scanning paths in different strip areas respectively, and the mode of dividing the strip areas and setting the corresponding scanning paths is favorable for preventing stress contraction from influencing printing quality and improving the processing quality of the workpiece when the large-format workpiece is processed.

Further, in one embodiment, the step of setting the scan angle of the first slice of the workpiece according to the initial scan angle may comprise:

step S301, determining a reference stripe region of the first-layer workpiece slice from each stripe region of the first-layer workpiece slice.

In this step, after the strip region division processing is performed on each layer of workpiece slices, a reference strip region of the first layer of workpiece slice may be determined from the strip regions of the first layer of workpiece slice, as shown in fig. 5, assuming that the workpiece slice 500 is the first layer of workpiece slice, one strip region may be selected as the reference strip region from five strip regions, and in general, the first strip region indicated by an arrow 510 may be selected as the reference strip region.

In step S302, the initial scan angle is set as the scan angle of the reference stripe region.

The initial scanning angle is set as the scanning angle of the scanning path of the reference strip area of the first layer workpiece slice.

Step S303, determining the scanning angle of each strip area of the first layer workpiece slice according to the scanning angle of the reference strip area and the scanning angle relation of the adjacent strip areas.

The first layer workpiece slice is divided into a plurality of strip areas, and a user can set a scanning path in each strip area, wherein the scanning paths between the strip areas have a certain relationship, such as the relationship between the scanning intervals or the scanning angles of the scanning paths.

In this step, the scan angle relationship between adjacent swathes is that the scan angles of the adjacent swathes are perpendicular to each other, and the scan angle of each swathe of the top layer workpiece slice can be determined based on the scan angle relationship and the scan angle of the reference swathe as shown in fig. 5, assuming that the scan angle of the scan path of the first swathe is α, the scan angle of the second swathe is α +90 degrees, the scan angle of the third swathe is α, and so on, the scan angle of the scan path of each swathe is obtained.

The embodiment can realize setting the scanning angle of the scanning path of each strip area of the first layer workpiece slice, and in the setting process of the scanning angle, the scanning angle of all the other strip areas can be quickly determined based on the scanning angle value of the reference strip area by utilizing the mutually perpendicular relation of the scanning angles of the adjacent strip areas, so that the setting operation of the scanning angle of the first layer workpiece slice is further accurately and quickly completed, and the setting efficiency of the scanning path is improved.

Further, in an embodiment, the step of determining the scanning angles of the remaining layers of workpiece slices in a layer-by-layer increasing manner according to the scanning angle variation and the scanning angle of the first layer of workpiece slices includes:

step S401, determining the reference strip area of the rest layers of workpiece slices according to the reference strip area of the first layer of workpiece slices.

After the reference strip area of the first layer of workpiece slices is determined, the reference strip areas of the rest layers of workpiece slices are determined according to the reference strip area of the first layer of workpiece slices. The dividing manner of the strip region of each layer of workpiece slices is the same as that of the first layer of workpiece slices, for example, the dividing manner of the strip region of each layer of workpiece slices can be the dividing manner shown in fig. 5, so as to divide the workpiece into a plurality of strip regions.

And S402, acquiring the scanning angles of the reference strip areas of the rest layers of workpiece slices in a layer-by-layer increasing mode according to the scanning angle and the scanning angle variation of the reference strip area of the first layer of workpiece slices.

The method mainly comprises the following steps that after the setting operation of the scanning angle of the reference strip area of the first-layer workpiece slice is completed, based on the scanning angle of the reference strip area of the first-layer workpiece slice, the scanning angles of the reference strip areas of the rest layers of workpiece slices are obtained in a layer-by-layer increasing mode according to the variation of the scanning angle.

Specifically, assuming that the scan angle of the reference stripe region of the first layer workpiece slice is α, the scan angle of the reference stripe region of the second layer workpiece slice may be increased by a scan angle change Δ α 0 on the basis of α, which results in that the scan angle of the reference stripe region of the second layer workpiece slice is α + Δ α, the scan angle of the reference stripe region of the third layer workpiece slice is α +2 × Δ α, the scan angle of the reference stripe region of the N-th layer workpiece slice … … is α + (N-1) × Δ α, and so on, the setting of the scan angle of the scan path of the reference stripe region of each layer workpiece slice is completed.

In step S403, the scanning angles of the respective strip regions of the remaining layers of workpiece slices are determined based on the scanning angles of the reference strip regions and the scanning angle relationship of the adjacent strip regions of the remaining layers of workpiece slices.

Taking a certain layer of workpiece slices as an example, as shown in fig. 5, assuming that the scanning angle of the scanning path of the reference strip region of the layer of workpiece slices is α, the scanning angle of the second strip region is α +90 degrees, the scanning angle of the third strip region is α, and so on, the scanning angles of the scanning paths of the strip regions of the layer of workpiece slices are obtained.

The present embodiment determines the reference stripe regions of the rest layers of workpiece slices through the reference stripe region of the first layer of workpiece slices, according to the scanning angle of the reference strip area of the first layer workpiece slice and the scanning angle variation set by the user, acquiring the scanning angles of the reference strip areas of the rest layers of the workpiece slices in a layer-by-layer increasing mode, acquiring the scanning angles of the strip areas of the rest layers of the workpiece slices according to the scanning angles of the reference strip areas of the rest layers of the workpiece slices and the scanning angle relation of the adjacent strip areas, the scanning angle of the scanning path of each layer of reference strip area is determined firstly, and then the scanning angle of the scanning path of each strip area is calculated in each layer of workpiece slice in combination with the mutually perpendicular relationship of the scanning angles of the adjacent strip areas, so that the setting efficiency of the scanning path is further accelerated, and the setting of each strip area of each layer of workpiece slice is effectively completed.

In one embodiment, the method may further comprise the steps of:

determining the blowing direction of a transverse blowing device configured for the powder laying type laser 3D printing system; and setting an initial scanning angle according to the blowing direction.

In the embodiment, the transverse air blowing device is configured for a powder-spreading type laser 3D printing system, is mainly used for blowing away metal powder splashing caused by laser sintering and preventing a large amount of powder from splashing to fall into an area to be printed, thereby affecting the printing quality, and the air outlet direction of the transverse air blowing device also has certain influence on the printing quality during the operation of the transverse air blowing device, referring to fig. 6, fig. 6 is a schematic position diagram of the transverse air blowing device in one embodiment, during operation of the printing system, the workpiece is filled according to the set scan path 611, while the lateral blowing device 600 blows air to the printing region 610 to blow away the metal powder splatter 612 caused by the laser sintering, however, if the air outlet direction of the transverse air blowing device is parallel to the scanning path, and the air receiving surface of the splashed powder is small, a large amount of powder splashes into the area to be printed. A similar situation exists for lateral filling.

The influence of the blowing direction of the transverse blowing device on the printing quality is considered in the embodiment, so that the initial scanning angle is set according to the blowing direction of the transverse blowing device, a large amount of powder is prevented from splashing to fall into a region to be printed in the working process of a printing system, and the printing quality is favorably improved.

Further, in one embodiment, the initial scan angle is set to 67 degrees; the scanning angle variation amount was set to 67 degrees.

This embodiment all sets initial scanning angle and scanning angle variation to 67 degrees, and the initial scanning angle of this embodiment refers to the scanning angle of scanning route and the contained angle that the device formed of blowing transversely, and the scanning angle of scanning route and the contained angle of blowing transversely the device be 67 degrees promptly, and this inclination can guarantee to spread powder formula laser 3D printing system when the operation, and the metal powder that leads to because of laser sintering that blows away splashes and is difficult to fall into and treats the printing area to the print quality of work piece has been guaranteed.

If the scanning angle variation is set to 67 degrees at the same time, when the scanning angle of each layer of workpiece slices of the workpiece is set, the scanning angle of each layer of workpiece slices is obtained by setting the scanning angle of the first layer of workpiece slices to 67 degrees and performing self-increment on each layer according to the initial scanning angle of each layer of workpiece slices. Specifically, if the scanning angle of the scanning path of the workpiece slice in the first layer is 67 degrees, the second layer is increased by 67 degrees, the scanning angle of the obtained scanning path is 134 degrees, the third layer and the last layer can also be obtained in sequence, and for convenience of calculation, when the scanning path of each layer is increased by more than 180 degrees, the scanning path of the current layer is subtracted by 180 degrees. The scanning angle of the scanning path of each layer of the embodiment changes by 67 degrees, so that the path overlapping rate can be reduced, when the rotation angle increases by 67 degrees layer by layer, path overlapping can only occur once for about 180 layers, and even if the layer thickness is thinner, the thermal stress after 100 layers can be well dispersed, so that the shrinkage of the surface stress in the process of melting to solidification is reduced, and particularly when a large-width workpiece is printed, the stress can be reduced and powder can be prevented from splashing into a printing area.

In one embodiment, the step of setting the scan path according to the scan pitch and the scan angle of the slice of the workpiece for each layer may comprise:

step S501, determining a circumscribed rectangular area matched with the workpiece outline according to the workpiece outline in each layer of workpiece slices.

The method mainly comprises the step of obtaining a circumscribed rectangular area of the workpiece outline in each layer of workpiece slices. Specifically, when the workpiece is sliced, the shapes of the workpiece slices of each layer may be different, taking a certain layer of workpiece slices as a circle as an example, the workpiece contour in the layer of workpiece slices is a circle, the maximum value and the minimum value of the abscissa and the maximum value and the minimum value of the ordinate of the workpiece contour can be calculated in a two-dimensional teaching coordinate system through the coordinates of the circle, so as to determine the circumscribed rectangle of the workpiece contour, and the region included in the circumscribed rectangle is a circumscribed rectangle region.

And step S502, filling scanning paths in the circumscribed rectangular area of each layer of workpiece slices according to the scanning distance and the scanning angle of each layer of workpiece slices.

In the step, after the circumscribed rectangular area of the workpiece outline in each layer of workpiece slices is determined, the scanning path can be filled in the circumscribed rectangular area according to the set scanning distance and the set scanning angle. In order to improve the setting efficiency of the scanning path, the scanning distance of the scanning path of each layer of workpiece slices can be a fixed value, so that when the scanning path is set, a user only needs to set a fixed value as the scanning distance, and the corresponding scanning path can be filled in the external rectangle by combining the scanning distance and the scanning angle.

Specifically, referring to fig. 7, fig. 7 is a sub-diagram of calculating scan paths in an embodiment, each scan path may be determined by two points, assuming that two-dimensional rectangular coordinates of two points (C1 and C2) below two adjacent scan paths are (X1, Y1) and (X2, Y2), respectively, a right triangle is constructed by point C1, point C2, and point C3, where point C3 is a point on the scan path of point C1, and then the formula Y2-Y1-K (X2-X1) may obtain the result

K represents the slope of the line containing points C1 and C2, β is the scan angle of the scan path, and the result is that

Wherein G represents the scanning distance of the scanning path, A represents the distance between the point C1 and the point C3, and the distance is derived by the trilateral relation of a right triangle

L, it can be seen that the step distance obtained is the same for the case of the same scan angle and scan pitch, referring to FIG. 8, FIG. 8 is a schematic diagram of FIG. 8 illustrating the filling scan path of the circumscribed rectangular area in one embodiment, the step corresponds to the distance between the step points on the X-axis of the circumscribed rectangular area 800, the step points on the X-axis of the circumscribed rectangular area 800 can be determined by the distance between the step points on the X-axis, and the circumscribed rectangular area can be determined by a similar methodAfter the X-axis step point and the Y-axis step point of the circumscribed rectangular area 800 are all calculated, the step points on the Y-axis of the circumscribed rectangular area 800 are sequentially and correspondingly connected to obtain the scanning path of the circumscribed rectangular area 800, wherein the scanning path indicated by the arrow 810 is one of the scanning paths of the circumscribed rectangular area 800.

Therefore, the user can complete the setting operation of the scanning path only by setting the scanning distance and the scanning angle of the scanning path, and under the condition of scanning at equal intervals and equal angles, the user does not need to calculate each scanning path and needs to obtain the stepping distance, finds each stepping point on the X axis and the Y axis, and can obtain each scanning path by connecting the stepping points in sequence, so that the setting efficiency of the scanning path is greatly improved.

In step S503, the print area of each layer of workpiece slices is determined according to the workpiece contour of each layer of workpiece slices.

The method mainly comprises the step of determining a printing area of each layer of workpiece slices according to the contour of the workpiece, wherein the printing area is an area where a scanning path for filling the workpiece to be printed by laser emitted by a powder laying type laser 3D printing system in the actual operation process is located. Referring to fig. 9(a), fig. 9(a) is a schematic diagram of a scanning path of a circumscribed rectangular region in an embodiment, the circumscribed rectangular region 910 includes a plurality of scanning paths 911, as shown in fig. 9(b), fig. 9(b) is a schematic diagram of a scanning path of a printing region in an embodiment, the slice of the layer of the workpiece is a rectangular frame, and includes an outer contour 920 and an inner contour 930, and the corresponding circumscribed rectangular region is the circumscribed rectangular region 910 in fig. 9(a), so that the printing region of the slice of the layer of the workpiece is a region formed between the outer contour 920 and the inner contour 930, and the printing region of each slice of the workpiece can be obtained in a similar manner.

And step S504, performing image Boolean operation on the printing area of the workpiece slice and the circumscribed rectangular area of each layer of workpiece slice to obtain a scanning path in the printing area of each layer of workpiece slice.

The method mainly comprises the step of carrying out graphic Boolean operation on the printing area of each layer of workpiece slices and the external rectangular area to obtain the scanning path in the printing area of each layer of workpiece slices. Referring to fig. 9(a) and 9(b), a plurality of scanning paths 911 are provided in the circumscribed rectangular region 910 of each layer of workpiece slices, and the printing region of the workpiece slices is a region formed between the outer contour 920 and the inner contour 930, and the scanning path is not filled in the formed region before the image boolean operation is performed, and in this step, the circumscribed rectangular region 910 and the printing region of the workpiece slices are subjected to the graphic boolean operation, and the scanning path of the non-printing region is removed to obtain the scanning path in the printing region of each layer of workpiece slices, as indicated by an arrow 921 in fig. 9(b), wherein the scanning path in the printing region of the workpiece slice corresponds to the scanning path indicated by an arrow 921 in fig. 9 (a).

The method comprises the steps of firstly searching for stepping points on an X axis and a Y axis of the external rectangular area, then connecting the stepping points to obtain a scanning path of the external rectangular area, then utilizing the scanning path of the external rectangular area and the printing area to carry out Boolean operation to obtain the scanning path, can better adapt to workpieces with different shapes and contour lines, and more accurately and quickly complete the setting operation of the scanning path of each layer of workpiece slices, on the premise of ensuring accurate setting of the scanning path, the setting efficiency of the scanning path is also effectively improved.

In an embodiment, a scan path setting apparatus is provided, and referring to fig. 10, fig. 10 is a block diagram of a scan path setting apparatus in an embodiment, where the scan path setting apparatus may be used to set a scan path of a powder-laying laser 3D printing system, and the apparatus may include:

an angle obtaining module 101, configured to obtain an initial scanning angle of a scanning path; the scanning path is a scanning path for filling the powder laying type laser 3D printing system to the workpiece;

the angle calculation module 102 is configured to calculate a scanning angle of each layer of workpiece slices of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein, the scanning angles of the workpiece slices of adjacent layers are different;

a path setting module 103, configured to obtain a scanning distance of a scanning path; and setting a scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices.

In one embodiment, the angle calculation module 102 may include:

the slicing processing unit is used for slicing the workpiece to obtain a plurality of layers of workpiece slices; the first-layer angle setting unit is used for setting the scanning angle of the first-layer workpiece slice according to the initial scanning angle; a variation determining unit for determining a scanning angle variation; and the angle determining unit is used for determining the scanning angles of the slices of the rest layers of workpieces in a layer-by-layer increasing mode according to the scanning angle variation and the scanning angle of the slice of the first layer of workpieces.

In one embodiment, the method may further include:

and the region dividing unit is used for dividing each layer of workpiece slice into a plurality of strip regions respectively.

In one embodiment, the first floor angle setting unit is further configured to:

determining a reference strip area of the first-layer workpiece slice from each strip area of the first-layer workpiece slice; setting the initial scanning angle as the scanning angle of the reference strip area; and determining the scanning angle of each strip area of the first-layer workpiece slice according to the scanning angle of the reference strip area and the scanning angle relation of the adjacent strip areas.

In one embodiment, the angle determination unit is further configured to:

determining the reference strip area of the rest layers of workpiece slices according to the reference strip area of the first layer of workpiece slices; acquiring the scanning angles of the reference strip areas of the rest layers of workpiece slices in a layer-by-layer increasing mode according to the scanning angle and the scanning angle variation of the reference strip area of the first layer of workpiece slices; and determining the scanning angle of each strip area of the rest layers of workpiece slices based on the scanning angle of the reference strip area of the rest layers of workpiece slices and the scanning angle relation of the adjacent strip areas.

In one embodiment, the method may further include:

the blowing direction determining unit is used for determining the blowing direction of a transverse blowing device configured for the powder laying type laser 3D printing system; and the initial setting unit is used for setting an initial scanning angle according to the blowing direction.

In one embodiment, the initial scan angle is set to 67 degrees; the scanning angle variation amount was set to 67 degrees.

In one embodiment, the path setting module 103 is further configured to:

determining a circumscribed rectangular area matched with the workpiece outline according to the workpiece outline in each layer of workpiece slices; filling scanning paths in the circumscribed rectangular area of each layer of workpiece slices according to the scanning distance and the scanning angle of each layer of workpiece slices; determining the printing area of each layer of workpiece slices according to the workpiece outline of each layer of workpiece slices; and performing image Boolean operation on the printing area of the workpiece slices and the circumscribed rectangular area of each layer of workpiece slices to obtain a scanning path in the printing area of each layer of workpiece slices.

The scan path setting device of the present invention corresponds to the scan path setting method of the present invention one to one, and for the specific limitations of the scan path setting device, reference may be made to the limitations of the scan path setting method in the foregoing, and the technical features and the advantages thereof described in the embodiments of the scan path setting method are all applicable to the embodiments of the scan path setting device, and are not described herein again. The modules in the scan path setting device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a control device is provided, and the control device may be implemented by a computer device such as a personal computer, a tablet computer, and the like, and its internal structure diagram may be as shown in fig. 11, where fig. 11 is an internal structure diagram of the control device in one embodiment. The control device comprises a processor, a memory, a network interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the control device is configured to provide computational and control capabilities. The memory of the control device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the control device is used for communicating with an external terminal through network connection. The computer program is executed by a processor to implement a scan path setting method. The display screen of the control device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the control device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the control device, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 11 is merely a block diagram of some of the structures associated with the inventive arrangements and is not intended to limit the computing devices to which the inventive arrangements may be applied, as a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, there is provided a control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:

acquiring an initial scanning angle of a scanning path; the scanning path is used for filling the powder laying type laser 3D printing system into the workpiece; calculating the scanning angle of each layer of workpiece slices of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein, the scanning angles of the adjacent layer workpiece slices are different; acquiring the scanning distance of a scanning path; and setting a scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices.

Referring to fig. 1, after the setting operation of the scanning path is completed, the control device may further control the laser 201 and the scanning galvanometer 203 through the galvanometer control card 202 according to the scanning path, so that the laser emitted by the laser 201 scans the workpiece 205 on the worktable 204, thereby printing and shaping the workpiece.

In one embodiment, the processor, when executing the computer program, further performs the steps of:

slicing the workpiece to obtain multilayer workpiece slices; setting the scanning angle of the first layer of workpiece slices according to the initial scanning angle; determining the scanning angle variation; and determining the scanning angle of the rest layers of workpiece slices in a layer-by-layer increasing mode according to the scanning angle variable quantity and the scanning angle of the first layer of workpiece slices.

and dividing each layer of workpiece slice into a plurality of strip areas.

Above-mentioned controlgear, through the computer program of operation on the treater for scanning route between the different layers changes according to the angle variation, and scanning angle between the adjacent layer is inequality, can disperse the thermal stress on adjacent layer effectively, avoids adjacent layer scanning route to take place to overlap and leads to the thermal stress too to concentrate the shrink and arouse the deformation of work piece, has reduced and has melted the shrink of solidifying in-process surface stress, has strengthened the stability of printing the piece, has also improved the job quality of shop's powder formula laser 3D printing system.

It will be understood by those of ordinary skill in the art that all or part of the processes for implementing the scan path setting method according to any of the above embodiments may be implemented by instructing the associated hardware by a computer program, which may be stored in a non-volatile computer-readable storage medium, which, when executed, may include the processes of the above embodiments of the methods, wherein any reference to memory, storage, database, or other medium used in the embodiments provided by the present invention may include non-volatile and/or volatile memory.

Accordingly, in one embodiment there is provided a computer readable storage medium having a computer program stored thereon, the computer program when executed by a processor implementing the steps of:

acquiring an initial scanning angle of a scanning path; determining the scanning angle of each layer of workpiece slices of the workpiece according to the set scanning angle variation and the initial scanning angle; acquiring the scanning distance of a scanning path; and setting a scanning path according to the scanning distance and the scanning angle of each layer of workpiece slices.

In one embodiment, the computer program when executed by the processor further performs the steps of:

and dividing each layer of workpiece slice into a plurality of strip areas.

According to the computer readable storage medium, the stored computer program enables the scanning paths between different layers to change according to the angle variation, and the scanning angles between adjacent layers are different, so that the thermal stress of the adjacent layers can be effectively dispersed, the phenomenon that the thermal stress is too concentrated and shrunk to cause the deformation of a workpiece due to the overlapping of the scanning paths of the adjacent layers is avoided, the shrinkage of the surface stress in the process of melting to solidification is reduced, the stability of a printed part is enhanced, and the operation quality of the powder-spreading type laser 3D printing system is also improved.

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

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

Claims

1. A scan path setting method for setting a scan path of a powder-laying laser 3D printing system, comprising the steps of:

determining the scanning angle of each layer of workpiece slices of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein the scanning angles of the workpiece slices of adjacent layers are different; the method comprises the following steps: dividing each layer of the workpiece slices into a plurality of strip areas respectively; the dividing mode of the strip area of each layer of workpiece slices is the same as that adopted by the first layer of workpiece slices; and determining a reference strip region for the top layer workpiece slice from each of the strip regions of the top layer workpiece slice; setting the initial scan angle to a scan angle of the reference stripe region; determining the scanning angle of each strip area of the first layer workpiece slice according to the scanning angle of the reference strip area and the scanning angle relation of the adjacent strip areas; determining the scanning angle variation; determining the scanning angle of each layer of rest workpiece slices in a layer-by-layer increasing mode according to the scanning angle variation and the scanning angle of the first layer of workpiece slices;

2. The scan path setting method according to claim 1, wherein the step of determining the scan angle of each layer of the workpiece slices of the workpiece based on the set scan angle change amount and the initial scan angle comprises:

and slicing the workpiece to obtain a plurality of layers of workpiece slices.

3. The scan path setting method according to claim 1, wherein the scan angle relationship of the adjacent band regions is such that the scan angles of the adjacent band regions are perpendicular to each other.

4. The scan path setting method according to claim 1, wherein the step of determining the scan angles of the remaining layers of workpiece slices in a layer-by-layer increasing manner according to the scan angle variation and the scan angle of the first layer of workpiece slices comprises:

determining the reference strip area of the rest layers of workpiece slices according to the reference strip area of the first layer of workpiece slices;

acquiring the scanning angles of the reference strip areas of the rest layers of workpiece slices in a layer-by-layer increasing mode according to the scanning angle of the reference strip area of the first layer of workpiece slices and the scanning angle variation;

and determining the scanning angle of each strip area of the rest layers of workpiece slices based on the scanning angle of the reference strip area of the rest layers of workpiece slices and the scanning angle relation of the adjacent strip areas.

5. The scan path setting method according to claim 1, further comprising the steps of:

determining the blowing direction of a transverse blowing device configured for the powder laying type laser 3D printing system;

and setting the initial scanning angle according to the blowing direction.

6. The scan path setting method according to any one of claims 1 to 5, wherein the initial scan angle and the scan angle variation amount are both 67 degrees.

7. The scan path setting method of claim 1, wherein the step of setting the scan path according to the scan pitch and the scan angle of each layer of the workpiece slices comprises:

determining a circumscribed rectangular area matched with the workpiece outline according to the workpiece outline in each layer of workpiece slices;

filling scanning paths in the circumscribed rectangular area of each layer of workpiece slices according to the scanning intervals and the scanning angles of each layer of workpiece slices;

determining the printing area of each layer of workpiece slices according to the workpiece outline of each layer of workpiece slices;

and performing image Boolean operation on the printing area of each layer of workpiece slices and the external rectangular area of each layer of workpiece slices to obtain a scanning path in the printing area of each layer of workpiece slices.

8. A scanning path setting device for setting a scanning path of a powder laying type laser 3D printing system, comprising:

the angle calculation module is used for calculating the scanning angle of each layer of workpiece slice of the workpiece according to the set scanning angle variation and the initial scanning angle; wherein the scanning angles of the workpiece slices of adjacent layers are different; further for: dividing each layer of the workpiece slices into a plurality of strip areas respectively; the dividing mode of the strip area of each layer of workpiece slices is the same as that adopted by the first layer of workpiece slices; and determining a reference strip region for the top layer workpiece slice from each of the strip regions of the top layer workpiece slice; setting the initial scan angle to a scan angle of the reference stripe region; determining the scanning angle of each strip area of the first layer workpiece slice according to the scanning angle of the reference strip area and the scanning angle relation of the adjacent strip areas; determining the scanning angle variation; determining the scanning angle of each layer of rest workpiece slices in a layer-by-layer increasing mode according to the scanning angle variation and the scanning angle of the first layer of workpiece slices;

9. A control apparatus of a powder-laying laser 3D printing system, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the scan path setting method according to any one of claims 1 to 7 to set a scan path of the powder-laying laser 3D printing system, and controls a laser and a scanning galvanometer through a galvanometer control card according to the scan path, so that the laser emitted by the laser scans a workpiece on a worktable.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the scan path setting method of any one of claims 1 to 7.