CN116277958A

CN116277958A - 3D printing forming method and device based on linear light source

Info

Publication number: CN116277958A
Application number: CN202310315551.6A
Authority: CN
Inventors: 张楠; 郜超军; 张强; 郑国强; 刘钺
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-23

Abstract

The invention relates to the technical field of 3D printing, in particular to a 3D printing forming method and device based on a linear light source, wherein the method comprises the following steps: establishing a three-dimensional coordinate system according to the geometric information of the 3D printing device; according to a model file of the three-dimensional model to be printed, obtaining a triangular grid model of the three-dimensional model; projecting all vertexes in the triangular mesh model onto a YOZ plane in the three-dimensional coordinate system to obtain a projection polygon; carrying out curved surface slice segmentation on the projection polygon; calculating a sampling interval of a sampling straight line to be filled in the ith layer of curved surface slice, calculating a sampling angle step length of the sampling straight line to be filled in the sampling interval according to the projection width of the linear light source, and calculating a filling scanning line segment, which is intersected with the triangular mesh model, of the sampling straight line to be filled in the ith layer of curved surface slice according to the sampling angle step length; and printing the three-dimensional model layer by layer according to the filling scanning line segments, so that the printing efficiency of the three-dimensional model is improved.

Description

3D printing forming method and device based on linear light source

Technical Field

The invention relates to the technical field of 3D printing, in particular to a 3D printing forming method and device based on a linear light source.

Background

3D printing technology, also known as "additive manufacturing technology", is an emerging manufacturing technology that builds materials layer by layer to create a solid body based on a digital model; the type of the three-dimensional photo-curing 3D printing process adopts consumable materials which are generally liquid photosensitive resin (or photo-curing resin, photosensitive resin and the like), wherein the photosensitive resin is a colloidal substance composed of high polymers, and can be converted from liquid to solid under the irradiation stimulus of ultraviolet light and the like with a certain wavelength, and meanwhile, the photosensitive resin has the advantages of low viscosity, small curing shrinkage, high curing rate, small swelling, high photosensitivity, high curing degree and the like, so that the three-dimensional photo-curing 3D printing process is widely used in the three-dimensional photo-curing 3D printing process.

According to the structural characteristics of the 3D printing device, the three-dimensional light curing process can be further divided into a three-dimensional light curing forming (Stereo Lithography Appearance, SLA) process, a light curing surface forming (Direct Light Processing, DLP) process and a light curing forming (Liquid Crystal Display, LCD) process by liquid crystal display; the SLA process adopts Ultraviolet (UV) laser as a point light source for scanning printing, and an oscillating mirror module is used for controlling an ultraviolet laser beam to finish scanning printing from point to line and line to surface on a forming plane; in addition, the ultraviolet laser and the vibrating mirror adopted by the SLA process also obviously increase the cost of equipment.

The light source adopted by the DLP process is an Ultraviolet (UV) projector, and a mask pattern in each layer of printing is formed by means of a high-resolution micro-mirror group, so that pattern section pattern information of each layer of printing is required, the liquid photosensitive resin is cured layer by layer in a layer projection exposure mode, and thus the three-dimensional model printing forming is completed, however, the forming precision of the DLP process depends on the resolution of the micro-mirror group, and the large-format micro-mirror group with high resolution increases the cost of DLP equipment; in general, two ways of moving a forming model after exposing a layer exist in DLP process equipment, one way is to lift the current forming layer upwards by a layer thickness distance, projection light of DLP needs to be projected to liquid photosensitive resin at the bottom from bottom to top through high-permeability glass at the bottom, however, the forming way causes abrasion of the glass surface of the bottom in the long-term use process, so that the later forming quality is affected; another is to lower the current shaping layer down by one layer thickness, then the liquid resin needs to be leveled by the left-right reciprocating motion of the doctor blade structure before the next layer is printed and manufactured, however, this approach significantly reduces the shaping efficiency of the DLP process.

The LCD process principle is similar to the DLP process technology, but it does not use a UV projector and a micromirror group to generate a projected cross-sectional pattern, but generates a specific cross-sectional pattern by deflection of inexpensive LCD liquid crystal, but the optical power in the LCD is significantly lower than UV light in the DLP, thus resulting in that the LCD device needs to increase the exposure time per layer to increase the curing strength of the liquid resin, resulting in lower print forming efficiency of the LCD process; in summary, the existing mainstream 3D printing technology has the problem that the forming efficiency, the forming precision and the equipment cost cannot be effectively balanced.

Disclosure of Invention

Accordingly, it is necessary to provide a 3D printing forming method and apparatus based on a linear light source to solve the problem that the existing 3D printing forming method and apparatus cannot effectively balance the forming efficiency, forming precision and equipment cost.

In a first aspect, an embodiment of the present invention provides a 3D printing forming method based on a linear light source, the method including the steps of:

s100: acquiring geometric information of a 3D printing device, the 3D printing device comprising: the three-dimensional coordinate system is established by taking the central axis of the rotary base as an X axis according to the geometric information of the 3D printing device;

s200: obtaining a model file of a three-dimensional model to be printed, and carrying out topology reconstruction on the model vertex coordinate relationship in the model file to obtain a triangular mesh model of the three-dimensional model;

s300: projecting all vertexes in the triangular mesh model onto a YOZ plane in the three-dimensional coordinate system to obtain a projection polygon of the triangular mesh model on the YOZ plane;

s400: taking a projection point of a central shaft of the rotating base platform on the YOZ plane as a circle center, and carrying out curved surface slice segmentation on the projection polygon to obtain a plurality of layers of curved surface slices;

s500: according to the projection polygon and the origin position of the three-dimensional coordinate system, calculating a sampling interval of a required filling sampling straight line in the ith layer of curved surface slice; calculating the sampling angle step length of a sampling straight line to be filled in the sampling interval according to the projection width of the linear light source on the YOZ plane; according to the sampling angle step length, calculating to obtain the angle distribution corresponding to the line to be filled and sampled in the ith layer of curved slice;

s600: according to the angle distribution, a filling scanning line segment, which is formed by intersecting a sampling straight line to be filled in the ith layer of curved surface section with the triangular mesh model, is obtained;

s700: generating a linear light source mask of the ith layer according to the filling scanning line segments, and printing the ith layer according to the linear light source mask.

Compared with the prior art, the invention has the beneficial effects that:

according to the 3D printing forming method based on the linear light source, a three-dimensional coordinate system is established according to a 3D printing forming device, all vertexes in a triangular mesh model are projected onto a YOZ plane of the three-dimensional coordinate system, then curved surface slicing is carried out, a plurality of layers of curved surface slices are formed, sampling intervals needing to be filled with sampling straight lines in each layer of curved surface slices are obtained, filling scanning line segments needing to be intersected with the triangular mesh model in the sampling intervals needing to be filled with the sampling straight lines are obtained, and the three-dimensional model is printed layer by layer according to the filling scanning line segments; according to the method, the patterns to be printed on each layer of the three-dimensional model are subjected to linear programming, so that high-precision generation of a curved surface linear scanning path of the complex three-dimensional model can be realized, and the printing efficiency of the three-dimensional model is improved.

Optionally, S400 includes:

calculating the maximum distance from all projection points in the projection polygon to the origin of the three-dimensional coordinate system, wherein the origin of the three-dimensional coordinate is the projection point of the central shaft of the rotating base station on the YOZ plane;

and calculating the radius of each layer of curved surface slice according to the maximum distance, the radius of the rotating base and the preset thickness of each layer of curved surface slice, and carrying out curved surface slice segmentation on the projection polygon according to the radius of each layer of curved surface slice.

Optionally, calculating a sampling interval for filling a sampling line in the ith layer of curved surface slice according to the projection polygon and the origin position of the three-dimensional coordinate system, including:

and calculating the intersection point of the projection polygon and the circle where the curved surface slice with the radius Ri is positioned according to the radius Ri corresponding to the curved surface slice of the ith layer, and connecting the intersection point to obtain the sampling interval needing to be filled with the sampling straight line.

Optionally, calculating a sampling angle step of the sampling interval, which needs to be filled with a sampling straight line, according to the projection width of the linear light source on the YOZ plane, including:

connecting an origin of the three-dimensional coordinate system with two intersection points in each group of intersection points to obtain a first straight line and a second straight line which intersect with a Y axis, and calculating an included angle theta max between the first straight line and the positive Y axis and an included angle theta min between the second straight line and the positive Y axis;

and calculating the sampling angle step length of the sampling straight line to be filled in an arc where the projection polygon intersects with the circle where the radius Ri is located according to the projection width of the linear light source on the YOZ plane, the included angle theta max and the included angle theta min.

Optionally, according to the angle distribution, a filling scan line segment where a sampling straight line in the ith layer of curved surface section intersects with the triangular mesh model is obtained, including:

calculating the projection point coordinates of the sampling straight line on the YOZ plane according to the angle distribution;

traversing projection triangles of all triangular patches of the triangular mesh model in the YOZ plane, and calculating to obtain three-dimensional coordinates of the intersection point of the sampling straight line and the triangular mesh model by using an intersection point calculation method of the three-dimensional space straight line and the triangular patches if the projection triangles cover the projection point coordinates;

incrementally sorting the obtained three-dimensional coordinates of all the intersection points according to the X-axis component to obtain an ordered intersection point sequence of the sampling straight line and the triangular patch model;

and grouping all the intersection points in pairs according to the ordered intersection point sequence, wherein two intersection points in each group form a section of filling scanning line segment.

Optionally, generating a linear light source mask of the ith layer according to the filling scanning line segment, and printing the ith layer according to the linear light source mask, including:

moving the movable scraper to a position with the distance between the movable scraper and the ith layer of curved slice being the preset thickness of each layer of curved slice;

setting the surface linear speed of the ith layer of curved surface slice as V, calculating the angular speed omega i of the rotation base at a constant speed according to the radius Ri of the circle where the ith layer of curved surface slice is positioned, and controlling the rotation base to rotate at a constant speed according to the angular speed omega i;

and irradiating the printing consumable corresponding to the ith layer by using the linear light source and the linear light source mask so as to print the ith layer.

In a second aspect, an embodiment of the present invention provides a 3D printing and forming device based on a linear light source, the device including:

the automatic printing device comprises a rotary base, a movable scraper, a consumable bin and a linear light source, wherein the rotary base is arranged above the consumable bin in parallel, and extends into the consumable bin for a preset distance so that the surface of the rotary base contacts printing consumables in the consumable bin;

the movable scraper is arranged in parallel with the central shaft of the rotary base and is spaced a preset distance from the surface of the rotary base;

the linear light source is arranged above the rotary base, is parallel to the central axis of the rotary base and is spaced from the surface of the rotary base by a preset distance;

the 3D printing forming apparatus further includes: the controller performs the linear light source-based 3D printing forming method according to the first aspect when executing the 3D printing forming program to control the rotary base, the moving blade, and the linear light source to print a three-dimensional model by the controller.

Compared with the prior art, the invention has the beneficial effects that:

according to the 3D printing forming device based on the linear light source, the rotating base is arranged above the consumable bin, the thickness of each layer of printing consumable is adjusted by moving the scraper, and the linear light source generates scanning light patterns in real time in the rotating process of the rotating base; the device does not need to repeatedly move the scraper in the printing process, so that the printing efficiency is improved, and the device has a simple structure and low manufacturing cost.

Optionally, the linear light source includes: the ultraviolet light source comprises an ultraviolet light tube and a linear lens, wherein the linear lens is used for generating an irradiation pattern of the linear light source according to ultraviolet rays emitted by the ultraviolet light tube by the 3D printing and forming method.

Optionally, the 3D printing forming device further includes: the horizontal sliding rail is provided with the movable scraper, and the movable scraper is arranged in the horizontal sliding rail so as to horizontally move through the horizontal sliding rail.

Optionally, the 3D printing forming device further includes: and the linear light source is arranged in the vertical slide rail, so that the linear light source can vertically move through the vertical slide rail.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of a 3D printing forming method based on a linear light source according to an embodiment of the present invention;

FIG. 2 is a schematic two-dimensional plan view of a 3D printing apparatus based on a linear light source according to an embodiment of the present invention;

FIG. 3 is a schematic three-dimensional perspective view of a 3D printing apparatus based on a linear light source according to an embodiment of the present invention;

FIG. 4 is a schematic view of a curved slice provided in an embodiment of the present invention;

FIG. 5 is a schematic diagram of calculating a corresponding angle of a curved slice sampling line according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a linear optical path of a mask provided in an embodiment of the invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".

Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

It should be understood that the sequence numbers of the steps in the following embodiments do not mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.

In one embodiment, a linear light source-based 3D printing forming method as shown in fig. 1 is provided, which may include the steps of:

step S100: acquiring geometric information of a 3D printing device, the 3D printing device comprising: the three-dimensional coordinate system is established by taking the central axis of the rotary base as the X axis according to the geometric information of the 3D printing device.

Referring to fig. 2, which is a two-dimensional schematic plan view of a 3D printing and forming device provided in this embodiment, referring to fig. 3, which is a three-dimensional schematic perspective view of a 3D printing and forming device provided in this embodiment, as can be seen from fig. 2 and 3, the printing and forming device includes: the linear light source 1, the rotary base 2, the movable scraper 3, the consumable bin 4, the horizontal sliding rail 6 and the vertical sliding rail 7; the rotary base station 2 adopts a cylindrical structure as a printing base station, and the cylindrical base station can rotate at a constant speed; the consumable feed bin 4 is arranged below the rotary base 2, and liquid printing consumables 5 are filled in the consumable feed bin, and the printing consumables 5 are photosensitive resin materials, so that the lower half part of the rotary base 2 can be immersed in the liquid photosensitive resin materials.

The movable scraper 3 is mounted on a horizontal slide rail 6 and can move horizontally under the control of a program. When the rotating base 2 rotates at a constant speed, the rotating base 2 immersed in the liquid photosensitive resin material sticks to the liquid photosensitive resin material; the linear light source 1 is mounted on a vertical slide rail 7 and can be vertically moved under the control of a program.

According to the geometric information of the printing device, a three-dimensional coordinate system is established by taking the central axis of the rotary base 2 as an X axis, wherein the three-dimensional coordinate system comprises a Y axis and a Z axis in addition to the X axis, and a YOZ plane formed by the Y axis and the Z axis is perpendicular to the X axis.

Step S200: and obtaining a model file of the three-dimensional model to be printed, and carrying out topological reconstruction on the model vertex coordinate relationship in the model file to obtain a triangular mesh model of the three-dimensional model.

In this embodiment, a three-dimensional model to be printed may be built through three-dimensional modeling software, the built three-dimensional model is exported to be a three-dimensional model in STL file format, a triangular mesh model G of the three-dimensional model is obtained through topology reconstruction according to the coordinate relationship of model vertices in the STL file, and an adjacent topology relationship structure between triangular patches in the triangular mesh model G is built.

The method for obtaining the corresponding triangular mesh model according to the three-dimensional model is the prior art, and is not described herein.

Step S300: and projecting all vertexes in the triangular mesh model onto a YOZ plane in the three-dimensional coordinate system to obtain a projection polygon of the triangular mesh model on the YOZ plane.

Referring to fig. 4, all vertices in the triangular mesh model G established above are projected onto the YOZ plane of the three-dimensional coordinate system, so as to obtain a projected polygon 11 of the triangular mesh model G on the YOZ plane, where the projected polygon 11 represents an outer boundary contour formed by the perpendicular projection of the triangular mesh model G on the YOZ plane.

Step S400: and taking a projection point of the central shaft of the rotating base platform on the YOZ plane as a circle center, and carrying out curved surface slice segmentation on the projection polygon to obtain a plurality of layers of curved surface slices.

According to the projected polygon 11, the radius of different layers of the three-dimensional model to be printed, which need to be sliced on a curved surface, is calculated, and the specific steps are as follows:

step S401: as shown in fig. 4, the maximum distance from all the projection points in the projection polygon 11 to the center point 13 of the rotation base is calculated first, and then the maximum distance value is the maximum curved surface slice radius Rmax at which the curved surface slice is performed.

Step S402: the radius of the projection contour 14 of the rotating base is obtained to be R0, the thickness of each layer of curved surface slice is set to be h, and the radius of the curved surface slice contour 12 where different curved surface slice layers are located can be calculated by using the formula Ri=R0+i×h, wherein i is used for representing the index of the curved surface slice layer, i is not less than 1 and not more than Imax, imax is the index value of the curved surface slice layer with the maximum model, and imax= (Rmax-R0)/h.

Step S500: according to the projection polygon and the origin position of the three-dimensional coordinate system, calculating a sampling interval of a required filling sampling straight line in the ith layer of curved surface slice; calculating the sampling angle step length of a sampling straight line to be filled in the sampling interval according to the projection width of the linear light source on the YOZ plane; and according to the sampling angle step length, calculating to obtain the angle distribution corresponding to the line to be filled and sampled in the ith layer of curved slice.

Referring to fig. 5, according to the projected polygon 11, the corresponding angle distribution θj of the filling sampling line required to be performed in the different curved slice layer thicknesses is calculated, and stored in the sequence W [ i ] [ j ], where i represents the layer thickness index of the currently performed curved slice, θj represents the angle value corresponding to the jth filling sampling line required to be performed in the current curved slice layer thickness, and the specific steps are as follows:

step S501: calculating intersection point sequences of a projection polygon and a circle where the radius Ri is located according to the radius Ri corresponding to the layer thickness cable of the current curved slice, wherein the intersection point sequences are grouped in pairs, and an arc formed by two intersection points in each group is a sampling interval needing to be added with a filling straight line; for example, if the intersection points are P1 and P2, the arc formed by the intersection points of P1 and P2 is the sampling interval in which the filling straight line needs to be added.

Step S502: and connecting the circle center with the intersection points P1 and P2 respectively to obtain a straight line OP1 and a straight line OP2, and calculating an included angle theta max between the straight line OP1 and the Y positive coordinate axis and an included angle theta min between the straight line OP2 and the Y positive coordinate axis.

Step S503: acquiring the actual width w of the linear light source projection, and setting the w as the interval between filled sampling straight lines; and calculating the sampling angle step length of the filling straight line required to be performed in the current circular arc P1P2 according to a formula epsilon= (w/Ri) 180/2 pi, wherein epsilon is the sampling angle step length, and Ri is the radius of the ith layer of curved surface slice.

Step S504: according to the sampling angle step epsilon, the angle thetaj=thetamin+epsilon x of the circular arc P1P2 to be filled with the sampling straight line can be further calculated, wherein 0 is less than or equal to j is less than or equal to Jmax, jmax is the sampling frequency corresponding to the maximum angle value of sampling, jmax= (thetamax-thetamin)/epsilon, and the angle thetaj corresponding to the filling sampling straight line in the current curved slice is stored in the sequence W [ i ] [ j ].

Step S600: and according to the angle distribution, solving a filling scanning line segment where a sampling line to be filled in the ith layer curved surface tangent plane intersects with the triangular mesh model.

Referring to fig. 6, according to the sequence W [ i ] [ j ] calculated in step S504, each slice layer and the ordered intersection sequences of each filling linear line 17 in the corresponding slice layer intersecting with the boundary 16 of the triangular mesh model G are sequentially processed, then the intersection points are grouped two by two, two intersection points in each group form a filling scan line segment, and the filling scan line segment set formed by the last of all intersection point sequences is saved into the sequence W [ i ] [ j ], where the filling scan line segment set is the scan line segment of the current curved surface slice position at the sampling linear position. For example, when the ordered intersection sequence of intersections includes only points P3 and P4, points P3 and P4 are connected to form a fill scan line segment 18.

In this embodiment, the steps of calculating the ordered intersection sequence of the boundaries of the sampling straight line and the triangular mesh model G are as follows:

step S601: assuming that the angle corresponding to the current filling sampling line is θj, the projection point coordinate of the sampling line on the YOZ plane is ps= (y, z):

step S602: and traversing the projection triangles of each triangle patch of the triangular mesh model G in the YOZ plane, and if the projection triangle corresponding to a certain triangle patch covers the projection point Ps, calculating the intersection point of the current filling sampling straight line and the triangle patch. Thus, the present invention can calculate three-dimensional coordinates at all intersections intersecting with the triangular mesh model G.

Those skilled in the art will appreciate that the process of calculating the intersection point of the three-dimensional straight line and the triangular patch is the prior art, and will not be described herein.

Step S603: and (3) incrementally sorting all the obtained intersection points according to the x component to obtain an ordered intersection point sequence of the sampling straight line and the triangular patch model G, and grouping the ordered intersection point sequences in pairs, wherein two intersection points in each group form a filling scanning line segment.

Step S700: generating a linear light source mask of the ith layer according to the filling scanning line segments, and printing the ith layer according to the linear light source mask.

In this embodiment, in the 3D printing forming process based on the linear light source, as the rotating base is printed layer by layer, the radius Ri of the forming surface of the rotating base is gradually increased, and in the rotating process of the rotating base, assuming that the linear velocity V of the forming surface of the rotating base is V, the linear ultraviolet light source can cure the photosensitive resin material on the forming surface of the rotating base well, that is, in the whole printing forming process, it is necessary to ensure that the linear velocity V of the forming surface of the rotating base is a constant value.

The specific 3D printing forming structure comprises the following steps:

step S701: in the initialization phase of printing, the linear light source is moved downwards to a suitable height m from the forming surface of the rotating base, which can be determined by a plurality of experiments to an optimal value; then, the doctor blade is moved in the horizontal rail position, see fig. 2, so as to be spaced from the forming surface of the rotating base by a set curved forming thickness value h.

Step S702: according to the sequence W [ i ] [ j ] calculated in step S504, each curved surface printing process comprises the following steps:

step S7021: assuming that the index of the currently formed curved surface is i (i is more than or equal to 1 is less than or equal to Imax), the radius Ri of the current curved surface forming can be further obtained, and the angular speed omega i=V/Ri of the rotating base rotating at a constant speed in the current curved surface forming process is further calculated.

Step S7022: and obtaining an angle distribution result theta j (j is more than or equal to 0 and less than or equal to Jmax) of the current curved surface layer needing to be scanned by the curved surface linear light source from the sequence W [ i ] [ j ], and printing the current curved surface layer, wherein the rotating base station always keeps the angular speed omega i to rotate at a constant speed in the process.

If the forming base in the current curved surface forming layer rotates by theta j, the filling scanning line segment set of the current angle position is taken out from the sequence W [ i ] [ j ], a mask of a linear scanning light source is formed based on the data (the subsequent linear light source can solidify the photosensitive resin material corresponding to the filling scanning line segment after irradiating the photosensitive resin material through the mask), and the surface of the rotating base at the current angle position is subjected to linear scanning, so that the photosensitive resin material is solidified on the surface of the curved surface material formed in the previous step.

Continuing to form the next linear scanning angle (j+1) of the current curved surface layer until j=jmax, and completing all linear scanning tasks of the current curved surface radius position.

S7023: the linear light source is moved up by the height of the curved shaped layer thickness h, while the moving doctor blade is moved horizontally back by the distance of the layer thickness h.

Step S703: repeating the step S702, continuing to print the next curved surface (i+1) until i=imax, and completing the curved surface printing, forming and manufacturing of the whole three-dimensional grid model G.

The 3D printing forming method based on the linear light source of the embodiment has the following characteristics:

(1) Firstly modeling a three-dimensional model to be printed and converting the three-dimensional model into a triangular mesh model, then precisely slicing a curved surface of the triangular mesh model, generating linear filling scanning line segment data which are used for forming different curved surfaces and have different rotation angle positions, and carrying out different rotation angle positions of different formed curved surfaces on a rotating base of a 3D printing device, wherein the linear filling scanning line data are used for generating strip light with different patterns, so that linear scanning printing is completed at the current forming position of the rotating base;

(2) The method has the advantages that the rotating base is always in a rotating state in the forming process, and the linear light source is adopted as the characteristic of the three-dimensional light curing process, so that the method has higher forming efficiency and forming precision, the problem of low efficiency of point-by-point scanning due to the fact that a scraper needs to be relied on to reciprocate in the traditional SLA (SLA) process and the like is solved, and meanwhile, compared with the DLP process, the LCD process and the like, the method has the advantages of large forming breadth, high forming efficiency, good forming quality, low cost and the like.

In one embodiment, there is provided a linear light source-based 3D printing forming apparatus as shown in fig. 2 and 3, the apparatus comprising: the device comprises a rotary base station 2, a movable scraper 3, a consumable material bin 4 and a linear light source 1, wherein the rotary base station 2 is arranged above the consumable material bin 4 in parallel, and extends into the consumable material bin 4 for a preset distance, so that the surface of the rotary base station 2 is in contact with printing consumables in the consumable material bin 4, and the printing consumables are liquid photosensitive resin materials; the movable scraper 3 is arranged in parallel with the central shaft of the rotary base 2 and is spaced a preset distance from the surface of the rotary base 2; the linear light source 1 is disposed above the rotating base 2, and the linear light source 1 is parallel to the central axis of the rotating base 2 and spaced apart from the surface of the rotating base 2 by a predetermined distance.

The 3D printing forming apparatus of the present embodiment further includes: the controller, the memory, and the 3D printing forming program stored in the memory and executable on the controller, when the controller executes the 3D printing forming program, implement the linear light source-based 3D printing forming method in the above embodiment to print the three-dimensional model by controlling the rotary base 2, the moving blade 3, and the linear light source 1 by the controller.

Optionally, the linear light source 1 includes: the ultraviolet light tube and the linear lens are used for generating an irradiation pattern of the linear light source according to ultraviolet rays emitted by the ultraviolet light tube by a 3D printing forming method, and in the embodiment, the linear lens can be a linear micro-mirror.

Optionally, the 3D printing forming device of the present embodiment further includes: the horizontal sliding rail 6, the movable scraper 3 is installed in the horizontal sliding rail 6, so that the movable scraper 3 can horizontally move through the horizontal sliding rail 6.

Optionally, the 3D printing forming device of the present embodiment further includes: and a vertical slide rail 7, wherein the linear light source 1 is installed in the vertical slide rail 7, so that the linear light source 1 vertically moves through the vertical slide rail 7.

The 3D printing and forming device of this embodiment has the following features:

(1) The linear light source adopts the linear micro-mirror and is matched with the ultraviolet lamp tube as a curing light source of photosensitive resin, so that the technical problem that the traditional DLP technology can only be formed by adopting a high-precision large-breadth surface micro-mirror group is solved, and the equipment cost of three-dimensional photo-curing is reduced;

(2) By adopting the design of the rotary base table and the sliding rail, the rotary base table can be always in a rotating state in the printing and forming process, and the problem of low efficiency of point-by-point scanning due to the fact that the scraper needs to reciprocate in the traditional SLA process and the like is solved.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference may be made to related descriptions of other embodiments.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. The 3D printing forming method based on the linear light source is characterized by comprising the following steps of:

2. The linear light source-based 3D printing forming method according to claim 1, wherein S400 comprises:

3. The linear light source-based 3D printing forming method according to claim 1, wherein calculating a sampling interval in which a sampling line is required to be filled in an i-th layer curved surface slice according to origin positions of the projection polygon and the three-dimensional coordinate system, comprises:

4. The linear light source-based 3D printing forming method according to claim 1, wherein calculating a sampling angle step of the sampling interval in which a sampling line needs to be filled according to a projection width of the linear light source on the YOZ plane comprises:

5. The 3D printing forming method based on the linear light source according to claim 1, wherein the step of calculating a filling scan line segment where a sampling straight line in an i-th layer curved surface section intersects with the triangular mesh model according to the angle distribution includes:

6. The linear light source-based 3D printing forming method of claim 2, wherein generating a linear light source mask of an i-th layer from the fill scan line segments, printing the i-th layer from the linear light source mask, comprises:

7. A linear light source-based 3D printing forming device, comprising: the automatic printing device comprises a rotary base, a movable scraper, a consumable bin and a linear light source, wherein the rotary base is arranged above the consumable bin in parallel, and extends into the consumable bin for a preset distance so that the surface of the rotary base contacts printing consumables in the consumable bin;

the 3D printing forming apparatus further includes: a controller, a memory, and a 3D printing shaping program stored in the memory and executable on the controller, the controller implementing the linear light source-based 3D printing shaping method according to any one of claims 1 to 6 when executing the 3D printing shaping program to control printing of a three-dimensional model by the controller, the rotating base, the moving blade, and the linear light source.

8. The linear light source-based 3D print forming apparatus of claim 7, wherein the linear light source comprises: the ultraviolet light source comprises an ultraviolet light tube and a linear lens, wherein the linear lens is used for generating an irradiation pattern of the linear light source according to ultraviolet rays emitted by the ultraviolet light tube by the 3D printing and forming method.

9. The linear light source based 3D print forming apparatus according to claim 7, wherein the 3D print forming apparatus further comprises: the horizontal sliding rail is provided with the movable scraper, and the movable scraper is arranged in the horizontal sliding rail so as to horizontally move through the horizontal sliding rail.

10. The linear light source based 3D print forming apparatus according to claim 7, wherein the 3D print forming apparatus further comprises: and the linear light source is arranged in the vertical slide rail, so that the linear light source can vertically move through the vertical slide rail.