CN109648848B - Non-redundant laminated additive manufacturing process and manufacturing device based on photosensitive bonding - Google Patents

Non-redundant laminated additive manufacturing process and manufacturing device based on photosensitive bonding Download PDF

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Publication number
CN109648848B
CN109648848B CN201811640768.XA CN201811640768A CN109648848B CN 109648848 B CN109648848 B CN 109648848B CN 201811640768 A CN201811640768 A CN 201811640768A CN 109648848 B CN109648848 B CN 109648848B
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additive
layer
light source
model
line light
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CN109648848A (en
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张百成
任淑彬
陈刚
章林
秦明礼
曲选辉
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/147—Processes of additive manufacturing using only solid materials using sheet material, e.g. laminated object manufacturing [LOM] or laminating sheet material precut to local cross sections of the 3D object
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/188—Processes of additive manufacturing involving additional operations performed on the added layers, e.g. smoothing, grinding or thickness control
    • B29C64/194—Processes of additive manufacturing involving additional operations performed on the added layers, e.g. smoothing, grinding or thickness control during lay-up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/379—Handling of additively manufactured objects, e.g. using robots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling

Abstract

The invention relates to the technical field of additive manufacturing, and provides a redundancy-free laminated additive manufacturing process and a manufacturing device based on photosensitive bonding, wherein photosensitive bonding agents are respectively coated on the upper surface and the lower surface of an additive sheet layer; the additive sheet layer is cured in a subarea mode by utilizing a subarea curing line light source; cutting the additive sheet layer according to the outline boundary of the model; rolling the upper surface of the additive sheet layer by using a compression roller, and removing the additive in the redundant region of the model by bonding with the compression roller; curing the upper layer of the model area; and repeating the steps, and curing and bonding layer by layer to finish the redundancy-free laminated additive manufacturing. The invention solves the technical problems that the traditional technology needs great post-treatment workload to clean the solidified redundant structure, the printing model structure is deformed, and the hollow and closed pore structure can not be manufactured; greatly improves the manufacturing technical level of the laminated additive, greatly widens the application field of the technology, and has wide application prospect.

Description

Non-redundant laminated additive manufacturing process and manufacturing device based on photosensitive bonding
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a non-redundant laminated additive manufacturing process and a manufacturing device based on photosensitive bonding.
Background
Laminated solid manufacturing (L aminated object manufacturing, &ttttransformation = L "&tttl &ttt/t &tttom), also known as laminated additive manufacturing technology, is the earliest additive manufacturing technology currently occurring in the world, and its working principle is that a laser cutting system cuts a sheet coated with a hot melt adhesive on the back side according to cross-sectional contour line data extracted by a computer.
Because the redundant structure can not be removed along with the layer in the manufacturing process of the technology, the solidified redundant structure needs to be cleaned by great post-processing workload, the printing model structure is easy to deform, and the redundant material in the common hollow and closed pore structures in additive manufacturing can not be cleaned, so that parts with complex structures such as a hollow structure and the like can not be manufactured.
Disclosure of Invention
The invention aims to solve the technical problems and provides a non-redundant laminated additive manufacturing process and a manufacturing device based on photosensitive bonding.
The technical scheme of the invention is as follows:
a non-redundant additive-stack manufacturing process, comprising the steps of:
s1, respectively coating photosensitive adhesives on the upper and lower surfaces of the additive sheet layer;
s2, the additive sheet layer is cured in a partition mode through a selective curing line light source, wherein the lower layer is cured in the model area, the upper layer is cured in the model redundant area, and the outer area of the model is not cured;
s3, cutting the additive sheet layer according to the outline boundary of the model;
s4, rolling the upper surface of the additive sheet layer by using a compression roller, and removing the adhesion of the additive of the model redundant area and the compression roller;
and S5, curing the upper layer of the model area.
Further, the method also comprises the following steps: and S6, repeating the steps S1-S5, and curing and bonding layer by layer to finish the redundancy-free laminated additive manufacturing.
Furthermore, the material of the additive sheet layer is paper, high polymer, aluminum, copper, titanium or iron.
Further, in step S1, the photosensitive binder is a photosensitive resin.
Further, in step S3, the cutting is mechanical cutting or high-energy beam cutting.
Further, the mechanical cutting is performed by a cutting tool; the high energy beam comprises a femtosecond, picosecond laser beam.
The invention also provides a manufacturing device of the non-redundant laminated additive, which comprises a workbench, a material feeding scroll, a collecting scroll, an upper layer selective area line light source, a lower layer selective area line light source, a third line light source, a cutter and a press roller;
the workbench is a lifting mechanism; the feeding reel and the collecting reel are respectively arranged on two sides of the workbench;
the upper layer selective area line light source and the lower layer selective area line light source are both positioned above the workbench and close to one end of the material feeding reel and are respectively used for solidifying the upper layer and the lower layer of the material increase; the upper layer selective area line light source and the lower layer selective area line light source are arranged up and down oppositely;
the third line light source is positioned above the workbench and close to one end of the collecting scroll, and the third line light source is used for curing the upper layer of the additive;
the cutter is positioned above the workbench and used for cutting the boundary of the model outline;
the compression roller is used for rolling the additive materials and removing redundant additive materials.
Furthermore, the upper layer selective area line light source, the lower layer selective area line light source and the third line light source are all composed of point light sources.
Further, the cutter is a mechanical cutter or a high energy beam.
Further, the material adding sheet layer is conveyed to the workbench from the material feeding reel, and the upper surface and the lower surface of the material adding sheet layer are coated with photosensitive adhesives;
the lower layer selective area line light source irradiates and solidifies the lower surface of the model area of the material increase sheet layer, and the upper layer selective area line light source irradiates and solidifies the upper surface of the model redundant area of the material increase sheet layer;
the cutter cuts according to the outline boundary of the model, and divides the material adding slice layer into a model area, a model redundant area and an outer model area;
the compression roller rolls from one end of the workbench to the other end of the workbench, and the model redundant part of the additive sheet layer is taken away from the additive sheet layer due to the combination of the cured photosensitive adhesive and the compression roller;
the third line light source is used for curing the uncured photosensitive adhesive on the upper surface of the rest additive sheet layer;
the table is lowered and the collection reel retrieves the remainder of the additive sheet layer.
The invention has the beneficial effects that: the method solves the technical problems that in the traditional laminated additive manufacturing, due to the existence of a layer redundancy structure, the solidified redundant structure needs to be cleaned by great post-processing workload, the printing model structure is easy to deform, and the redundancy materials in the hollow and closed pore structures which are common in additive manufacturing cannot be cleaned; the method carries out subarea solidification on the additive sheet layer, redundant parts of the model can be removed along with the layer while the required layer structure is solidified, and the required three-dimensional solid model is gradually formed along with the layer-by-layer adhesion; greatly improves the manufacturing technical level of the laminated additive, greatly widens the application field of the technology, and has wide application prospect.
Drawings
FIG. 1 is a schematic cross-sectional view of a printed part (mold).
Fig. 2 is a schematic structural diagram of a manufacturing apparatus for additive manufacturing without redundancy in a stacked manner according to an embodiment of the present invention.
FIG. 3 is a schematic diagram showing the change of state of a photosensitive adhesive on the surface of an additive sheet;
in the figure, a is the state before the upper and lower surface photosensitive adhesives are cured; b is the state of the upper and lower layers of photosensitive binder after curing; c is the state after cutting; d is a state after redundancy removal; e is the post-cure state.
Wherein: 1-model redundant area (part to be removed); 2-model area (part to be printed solid part); 3-extra-model area (residual recovery); 4-an additive sheet layer; 5-feeding the material reel; 6-a workbench; 7-a photosensitive binder; 8-lower layer selected area line light source; 9-upper layer selective area line light source; 10-upper curing zone; 11-a lower layer curing zone; 12-a cutter; 13-a press roll; 14-a third line light source; 15-collection reel.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments.
The embodiment of the invention provides a manufacturing process of redundancy-free laminated additive, which comprises the following steps:
s1, respectively coating the upper and lower double faces of the additive sheet layer 4 with photosensitive adhesives 7; preferably, the photosensitive binder 7 is a photosensitive resin; the material of the additive sheet layer 4 is paper, high polymer, aluminum, copper, titanium or iron and other metals;
s2, the additive sheet layer 4 is cured in a partition mode through a selective curing line light source, wherein the lower layer is cured in the model area 2, the upper layer is cured in the model redundant area 1, and the outer region 3 of the model is not cured;
s3, cutting the additive sheet layer 4 according to the outline boundary of the model; preferably, mechanical cutting or high-energy beam cutting can be selected; the high energy beam comprises a femtosecond, picosecond laser beam;
s4, rolling the upper surface of the additive sheet layer 4 by using a pressing roller 13, and removing the additive in the model redundant region 1 by adhering to the pressing roller 13;
and S5, curing the upper layer of the model area 2.
And S6, repeating the steps S1-S5, curing layer by layer, bonding, finishing non-redundant laminated additive manufacturing, and obtaining the three-dimensional model.
As shown in fig. 2, a manufacturing apparatus for non-redundant laminated additive, according to an embodiment of the present invention, includes a worktable 6, a feeding reel 5, a collecting reel 15, an upper layer selected area line light source 9, a lower layer selected area line light source 8, a third line light source 14, a cutter 12, and a pressing roller 13;
the workbench 6 is a lifting mechanism; the feeding reel 5 and the collecting reel 15 are respectively arranged on two sides of the workbench 6;
the upper layer selective area line light source 9 and the lower layer selective area line light source 8 are both positioned above the workbench 6 and close to one end of the material feeding reel 5 and are respectively used for solidifying the upper layer and the lower layer of the additive; the upper layer selective area line light source 9 and the lower layer selective area line light source 8 are arranged up and down oppositely;
the third line light source 14 is positioned at one end of the working table 6 close to the collecting scroll 15, and the third line light source 14 is used for curing the upper layer of the additive;
the cutter 12 is positioned above the workbench 6 and is used for cutting the boundary of the model outline;
the compression roller 13 is used for rolling the additive to remove redundant additive.
The process for performing non-redundant laminated additive manufacturing by using the manufacturing device shown in fig. 2 comprises the following steps:
and (3) partition curing and bonding: the additive sheet layer 4 is conveyed from the material feeding reel 5 to the workbench 6, and the upper surface and the lower surface of the additive sheet layer 4 are coated with photosensitive adhesives 7, and the state is shown as a in fig. 3; the lower selective area line light source 8 irradiates and cures the lower surface of the model area 2 (part to be printed) of the additive sheet layer 4, and the upper selective area line light source 9 irradiates and cures the upper surface of the model redundant area 1 (part to be removed) of the additive sheet layer 4; the line light sources 8 and 9 in the selected area operate in a manner similar to ink-jet printing, and as the sheet moves, the line light sources consisting of a plurality of point light sources are opened, closed and scanned according to a model slice pattern, and the photosensitive adhesive 7 on the material of the additive sheet layer 4 is irradiated by light to start curing. The upper and lower layers of the photosensitive adhesive 7 are cured as shown in fig. 3 b, 10 being an upper layer curing region and 11 being a lower layer curing region.
Cutting: after the photosensitive adhesive 7 is cured, a cutter 12 (mechanical or high-energy beam) cuts the pattern according to the outline boundary of the pattern, and the additive sheet layer 4 is divided into a pattern region 2, a pattern redundant region 1 and a pattern outer region 3; the post-cutting state is shown as c in fig. 3;
and (3) redundancy removal: the compression roller 13 rolls from one end of the workbench 6 to the other end, and the model redundant area 1 of the additive sheet layer 4 is taken away from the additive sheet layer 4 due to the combination of the cured photosensitive adhesive 7 and the compression roller 13; the state after redundancy removal is shown as d in fig. 3;
and (3) subsequent curing: the third line light source 14 cures the uncured photosensitive adhesive 7 on the upper surface of the remaining additive sheet layer 4, so that the upper surface is completely hardened, and the state after subsequent curing is shown as e in fig. 3;
after printing of one layer, the working table 6 descends, the collection reel 15 recovers the rest of the additive sheet layer 4, and the next layer is repeated until the whole three-dimensional solid model is completed.
While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.

Claims (9)

1. A manufacturing process of redundancy-free laminated additive materials is characterized by comprising the following steps:
s1, respectively coating photosensitive adhesives on the upper and lower surfaces of the additive sheet layer;
s2, the additive sheet layer is cured in a partition mode through a selective curing line light source, wherein the lower layer is cured in the model area, the upper layer is cured in the model redundant area, and the outer area of the model is not cured;
s3, cutting the additive sheet layer according to the outline boundary of the model;
s4, rolling the upper surface of the additive sheet layer by using a compression roller, and removing the adhesion of the additive of the model redundant area and the compression roller;
s5, solidifying the upper layer of the model area;
and S6, repeating the steps S1-S5, and curing and bonding layer by layer to finish the redundancy-free laminated additive manufacturing.
2. The process of manufacturing a non-redundant additive laminate of claim 1 wherein the material of the additive sheet layer is paper, a high polymer, aluminum, copper, titanium, or iron.
3. The manufacturing process of non-redundant laminated additive according to claim 1, wherein in step S1, the photosensitive binder is a photosensitive resin.
4. The manufacturing process of non-redundant additive laminate according to any one of claims 1-3, wherein in step S3, the cutting is mechanical cutting or high energy beam cutting.
5. The non-redundant additive-laminated manufacturing process of claim 4, wherein the mechanical cutting is performed by a cutting tool; the high energy beam comprises a femtosecond, picosecond laser beam.
6. The manufacturing device for the redundancy-free laminated additive is characterized by comprising a workbench, a material feeding reel, a collecting reel, an upper layer selective area line light source, a lower layer selective area line light source, a third line light source, a cutter and a press roller;
the workbench is a lifting mechanism; the feeding reel and the collecting reel are respectively arranged on two sides of the workbench;
the upper layer selective area line light source and the lower layer selective area line light source are both positioned above the workbench and close to one end of the material feeding reel and are respectively used for solidifying the upper layer and the lower layer of the material increase; the upper layer selective area line light source and the lower layer selective area line light source are arranged up and down oppositely;
the third line light source is positioned above the workbench and close to one end of the collecting scroll, and the third line light source is used for curing the upper layer of the additive;
the cutter is positioned above the workbench and used for cutting the boundary of the model outline;
the compression roller is used for rolling the additive materials and removing redundant additive materials.
7. The redundancy-free additive layer manufacturing apparatus of claim 6, wherein the upper layer selected area line light source, the lower layer selected area line light source, and the third line light source are each composed of point light sources.
8. The non-redundant additive-stack manufacturing apparatus of claim 6, wherein the cutter is a mechanical cutter or a high energy beam.
9. The manufacturing apparatus of non-redundant additive laminate according to any one of claims 6 to 8,
the material adding sheet layer is conveyed to the workbench from the material feeding reel, and the upper surface and the lower surface of the material adding sheet layer are coated with photosensitive adhesives;
the lower layer selective area line light source irradiates and solidifies the lower surface of the model area of the material increase sheet layer, and the upper layer selective area line light source irradiates and solidifies the upper surface of the model redundant area of the material increase sheet layer;
the cutter cuts according to the outline boundary of the model, and divides the material adding slice layer into a model area, a model redundant area and an outer model area;
the compression roller rolls from one end of the workbench to the other end of the workbench, and the model redundant part of the additive sheet layer is taken away from the additive sheet layer due to the combination of the cured photosensitive adhesive and the compression roller;
the third line light source is used for curing the uncured photosensitive adhesive on the upper surface of the rest additive sheet layer;
the table is lowered and the collection reel retrieves the remainder of the additive sheet layer.
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