CN110509542A - A kind of compound 3D printing structure of polychrome and Method of printing - Google Patents
A kind of compound 3D printing structure of polychrome and Method of printing Download PDFInfo
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- CN110509542A CN110509542A CN201910769665.1A CN201910769665A CN110509542A CN 110509542 A CN110509542 A CN 110509542A CN 201910769665 A CN201910769665 A CN 201910769665A CN 110509542 A CN110509542 A CN 110509542A
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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
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
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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
- B29C64/20—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
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/295—Heating elements
-
- 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
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
- B29C64/336—Feeding of two or more materials
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a kind of compound 3D printing structure of polychrome and Method of printings, it is designed using the extrusion screw rod structure of four-part form, feed zone, fluxing zone and compression section are using the identical screw-rod structure design of major diameter of thread, fluxing zone uses gradual change deep spiral slot, mix the mixture entered in mixing machine from trunnion tentatively by feed zone, subsequently into the fluxing zone of gradual change deep spiral slot, mixture enters the increase of fluxing zone flow velocity, so that mixture is sufficiently plasticized into compression section makes mixture mixing compression, mixing extruding zone by being equipped with shearing tooth shears mixing mixture, mixture can mix again in cavity before entering nozzle, so as to guarantee that mixture is uniformly mixed, pass through multiple throat-feds, it can be realized quick feeding and mixture can be made to be sufficiently mixed by the extrusion screw rod structure of four-part form, It can be improved mixing efficiency while ensuring print quality, to improve printing effect, present apparatus structure is simple, and mixing efficiency is high, is uniformly mixed.
Description
Technical field
The invention belongs to the field of 3D printing equipment, has and be related to a kind of compound 3D printing structure of polychrome and Method of printing.
Background technique
Typical silk material class 3D printing technique is exactly FDM technology, based on plastics silk material, by needed for Deformation In The Fdm Process
Finished product.Currently, most of silk material 3D printing equipment can only realize monochromatic printing, or simple non-uniform colour print, do not have
There is polychrome Free Printing truly.
Existing polychrome 3D printing technique mainly includes that more spray heads realize that multi-color printing and multiple feed inlet single nozzle realize polychrome
It beats.Multi-nozzle 3D printer, multiple spray heads are respectively independent, and when carrying out color replacement, each spray head cannot alternately be accomplished completely
It is overlapped, will result in occur apparent color difference before and after linking in this way；In addition, frequently replacing spray head, increase print time, drop
Low printing effect.However then multiple feed inlet single nozzle carries out mixing in blending bunker, so using at least two feeding manners
It squeezes out afterwards and realizes multi-color printing, can solve the problems, such as more spray head multi-color printings very well, but there are still mixings uneven, printing
The defects of low efficiency.
Application No. is the FDM print heads that a kind of achievable gradual change colour is referred in CN201510841463.5, if by
It is dry to there is color masterbatch silk feed inlet to provide different colorants, then cooperate Screw Extrusion, realize gradual change colour print, but its structure is relatively simple
It is single, shear action do not had to raw molecule, it is abundant that colorant in mixing chamber not can guarantee mixing.In addition, existing use screw rod
Multi-color printing technology is squeezed out, is exactly that screw rod rotation keeps spiral to take when being extruded material from nozzle there is also a common problem
To printing load is unstable, influences the accumulation effect of material, the quality of final finished not can guarantee.
Summary of the invention
The purpose of the present invention is to provide a kind of compound 3D printing structure of polychrome and Method of printings, to overcome existing print head
The problem of mixing is uneven, discharging is unstable, low efficiency.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of compound 3D printing structure of polychrome, including mixing machine, nozzle and extrusion screw rod, mixing machine are interior logical along being axially arranged with
Hole mixing chamber, nozzle are set to mixing machine lower end, and mixing machine side wall is equipped with the feed inlet of multiple connection mixing chambers, sets in feed inlet
There is trunnion, silk material is entered in the mixing chamber of mixing machine by trunnion, and extrusion screw rod is placed in the mixing chamber of mixing machine, extrusion screw rod
Including feed zone, fluxing zone, compression section and mixing extruding zone, feed zone, fluxing zone and compression section are the identical spiral shell of major diameter of thread
Bar, feed zone and compression section are even depth helicla flute, and fluxing zone is gradual change deep spiral slot, and mixing extruding zone includes multiple sets
It is placed in the shearing tooth on extrusion screw rod surface, the spiral groove depth of feed zone is greater than the spiral groove depth of compression section, the spiral shell of fluxing zone
Spin slot depth capacity is identical as the spiral groove depth of feed zone, the helicla flute minimum-depth of fluxing zone and the spiral groove depth of compression section
Spend identical, the maximum shear tooth outer diameter for mixing extruding zone is identical as the major diameter of thread of feed zone；Trunnion be located in mixing machine into
Material mouth is located at the feed zone of extrusion screw rod；Extrusion screw rod upper end is driven by driving device.
Further, shearing tooth is the column being arranged perpendicular to extrusion screw rod surface.
Further, driving device includes driving motor, is fixed with ring flange on the outside of mixing machine upper end, driving motor it is defeated
The shell of shaft end is equipped with connecting flange out, and connecting flange is bolted with ring flange, the output shaft of driving motor with it is crowded
Screw rod is fixedly connected out.
Further, the output shaft of driving motor is equipped with radial screw bore；One end of extrusion screw rod is equipped with axial setting
Output shaft mounting hole, extrusion screw rod side wall offer connection output shaft mounting hole radial through-hole, the output shaft of driving motor
It is placed in output shaft mounting hole, is fastened with the output shaft on extrusion screw rod by screw in driving motor output shaft.
It further, further include the radiator being wrapped on the outside of trunnion, radiator side is equipped with radiator fan, and the one of trunnion
End is connected with the pneumatic joint for connecting wire feeder.
Further, heating coil and temperature sensor are equipped on the outside of mixing machine.
Further, heating coil includes upper heating coil and lower heating coil, and upper heating coil and lower heating coil are wrapped in mixing machine
Outer wall on, temperature sensor is set between heating coil and lower heating coil.
Further, it is fixed with flow distribution plate in nozzle, multiple tap holes are offered on flow distribution plate.
Further, the difference of the screw thread outer diameter of extrusion screw rod and mixing chamber internal diameter is 0.1-1mm.
Further, angle is 40 ° -60 ° between the axis of trunnion and the axis of mixing machine.
A kind of compound 3D printing method of polychrome, comprising the following steps:
Step 1) treats location information and colouring information that printer model progress slicing delamination obtains each layer of slicing layer,
According to the location information and colouring information generation model print data of each layer of slicing layer, store into model database；
Step 2), the model print data according to generation, control each wire feeder and silk material are taken to send to each feed inlet in proportion
It carries out being mixed to form printing mixture in silk to mixing tank；
Step 3) squeezes out printing mixture according to the model print data of generation, controls according to the location information of slicing layer
Nozzle is moved to corresponding position, and printing mixture is sprayed successively accumulation by nozzle and forms mould to be printed by the rotation of control extrusion screw rod
Type, to realize the compound 3D printing of polychrome.
Compared with prior art, the invention has the following beneficial technical effects:
A kind of compound 3D printing structure of polychrome of the present invention is designed using the extrusion screw rod structure of four-part form, extrusion screw rod with
Mixing chamber is formed between mixing tube inner chamber, feed zone, fluxing zone and compression section are designed using the identical screw-rod structure of major diameter of thread,
Feed zone and compression section are even depth helicla flute, and fluxing zone is gradual change deep spiral slot, and trunnion is located at the charging in mixing machine
Mouthful be located at the feed zone of extrusion screw rod, mix the mixture entered in mixing machine from trunnion tentatively by feed zone, then into
In the fluxing zone for entering gradual change deep spiral slot, mixture enters the increase of fluxing zone flow velocity, so that mixture is sufficiently plasticized, then
The compression section for entering back into even depth helicla flute makes mixture mixing compression, finally by the mixing extruding zone equipped with shearing tooth to mixed
It closes mixture to be sheared, mixture is enable to mix again in cavity before entering nozzle, so as to guarantee that mixture is mixed
It closes uniformly, by multiple throat-feds, can be realized quick feeding and can make to mix by the extrusion screw rod structure of four-part form
Material is closed to be sufficiently mixed, it is ensured that it can be improved mixing efficiency while print quality, so that printing effect is improved, present apparatus structure
Simply, mixing efficiency is high, is uniformly mixed.
Further, shearing tooth is the column being arranged perpendicular to extrusion screw rod surface, using column structure shearing tooth,
The mixed mixture of spiral section is sheared while extrusion screw rod rotation, mixes mixture again, it is ensured that mixing
The uniformity.
Further, driving device includes driving motor, is fixed with ring flange on the outside of mixing machine upper end, driving motor it is defeated
The shell of shaft end is equipped with connecting flange out, and connecting flange is bolted with ring flange, the output shaft of driving motor with it is crowded
Screw rod is fixedly connected out, compact-sized, and driving is stablized.
It further, further include the radiator being wrapped on the outside of trunnion, radiator side is equipped with radiator fan, and the one of trunnion
End is connected with pneumatic joint for connecting wire feeder, prevents in trunnion that temperature is excessively high to make colorant melt blocking feeding-passage,
Printing is caused to be interrupted.
Further, it is equipped with heating coil and temperature sensor on the outside of mixing machine, can precisely monitor the temperature of mixing machine, with
Guarantee that colorant is sufficiently plasticized in mixing machine, then by smooth extrusion nozzle.
Further, heating coil includes upper heating coil and lower heating coil, and upper heating coil and lower heating coil are wrapped in mixing machine
Outer wall on, temperature sensor is set between heating coil and lower heating coil, the mixing in feed zone, fluxing zone and compression section
Stream speed is different, heats respectively to extrusion screw rod difference section, it is ensured that mixture is in optimum temperature state in mixing machine.
Further, it is fixed with flow distribution plate in nozzle, multiple tap holes are offered on flow distribution plate, flow distribution plate relative nozzle is solid
Fixed, in extrusion process, mixture enters in nozzle mixture by tap hole, reduces screw orientation, provide it is stable out
Doses improves accumulation effect, improves print quality.
Further, the difference of the screw thread outer diameter of extrusion screw rod and mixing chamber internal diameter is 0.1-1mm, can prevent mixture from existing
The adhesion of mixing machine inner wall.
Further, angle is 40 ° -60 ° between the axis of trunnion and the axis of mixing machine, prevents material from falling to overflow, favorably
In in the mixing chamber that material can smoothly enter into mixing machine.
A kind of compound 3D printing method of polychrome, by the slicing layer information of model to be printed, into mixing tank conveying by than
The mixture of example mixing, is by force thoroughly mixed to form mixture by the mixing formed by segmental structure extrusion screw rod with mixing tank
Precisely color matching mixture improves printing precision and printing effect by moulding process molding, it can be achieved that polychrome precisely mixes printing
Rate.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Fig. 2 is perspective view of the present invention.
Fig. 3 is extrusion screw rod structural schematic diagram of the present invention.
Fig. 4 is extrusion screw rod cross-sectional view of the present invention.
Fig. 5 is manifold structure schematic diagram
Fig. 6 is flow distribution plate cross-sectional view.
Fig. 7 is nozzle arrangements schematic diagram
Fig. 8 is nozzle cross-sectional view.
Wherein: 1- driving motor, 2- extrusion screw rod, 3- screw, 4- ring flange, 5- mixing machine, 6- trunnion, 7- fasten spiral shell
Mother, 8- radiator, 9- radiator fan, 10- pneumatic joint, 11- white silk material, 12- red silk material, 13- yellow silk material, 14- are blue
Color silk material, the upper heating coil of 15-, 16- temperature sensor, heating coil under 17-, 18- flow distribution plate, 19- nozzle.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
As shown in Figures 1 to 8, the compound 3D printing structure of a kind of polychrome, including mixing machine 5, nozzle 19 and extrusion screw rod 2,
Along through-hole mixing chamber is axially arranged in mixing machine 5, nozzle 19 is set to 5 lower end of mixing machine, and 5 side wall of mixing machine is equipped with multiple connections
The feed inlet of mixing chamber, feed inlet is interior to be equipped with trunnion 6, and silk material is entered by trunnion 6 in the mixing chamber of mixing machine 5, extrusion screw rod 2
It is placed in the mixing chamber of mixing machine 5, extrusion screw rod 2 includes feed zone A, fluxing zone B, compression section C and mixing extruding zone D, charging
Section A, fluxing zone B and compression section C are the identical screw rod of major diameter of thread, and feed zone A is even depth helicla flute, and compression section C is equal deep
Helicla flute is spent, fluxing zone B is gradual change deep spiral slot, and mixing extruding zone includes multiple shearings for being set to 2 surface of extrusion screw rod
Tooth, shearing tooth are the column being arranged perpendicular to 2 surface of extrusion screw rod, and the spiral groove depth of feed zone A is greater than the spiral shell of compression section
Spin slot depth, the helicla flute depth capacity of fluxing zone B and the spiral groove depth of feed zone A are identical, and the helicla flute of fluxing zone B is minimum
Depth is identical as the spiral groove depth of compression section C, mixes the maximum shear tooth outer diameter of extruding zone and the major diameter of thread phase of feed zone A
Together；Trunnion 6 is located at the feed zone that the feed inlet in mixing machine 5 is located at extrusion screw rod 2；2 upper end of extrusion screw rod passes through driving device
Driving；Trunnion 6 connects wire feeder；Extrusion screw rod 2 and mixing machine form mixing chamber between 5 inside.
Driving device includes driving motor 1, is fixed with ring flange 4, the output shaft of driving motor 1 on the outside of 5 upper end of mixing machine
The shell at end is equipped with connecting flange, and connecting flange is bolted with ring flange 4, and the output shaft of driving motor 1 is equipped with
Radial screw bore；One end of extrusion screw rod 2 is equipped with the output shaft mounting hole being axially arranged, and 2 side wall of extrusion screw rod offers connection
The radial through-hole of shaft mounting hole is exported, the output shaft of driving motor 1 is placed in output shaft mounting hole, on 1 output shaft of driving motor
Radial screw bore and the output shaft mounting hole on extrusion screw rod 2 it is coaxial after, fastened by screw 3；
It further include the radiator 8 for being wrapped in 6 outside of trunnion, 8 side of radiator is equipped with radiator fan 9, and one end of trunnion 6 connects
It is connected to the pneumatic joint 10 for connecting wire feeder, convenient for quickly connection；
Heating coil and temperature sensor 16 are equipped on the outside of mixing machine 5, heating coil is heated for mixing tube inner chamber, temperature sensing
Device 16 is used for the monitoring of mixing machine temperature；Heating coil includes upper heating coil 15 and lower heating coil 17, upper heating coil 15 and lower heating
Circle 17 is wrapped on the outer wall of mixing machine 5, and temperature sensor 16 is set between heating coil 15 and lower heating coil 17；
It is fixed with flow distribution plate 18 in nozzle 19, multiple tap holes are offered on flow distribution plate 18, are shunted on the flow distribution plate 18
Hole shunts the colorant in mixing machine 5, reduces screw orientation, provides stable load, improve accumulation effect, mention
High print quality.
The screw thread outer diameter of extrusion screw rod 2 and the difference of mixing chamber internal diameter are 0.1-1mm.
Angle is 40 ° -60 ° between the axis of trunnion 6 and the axis of mixing machine 5.
Technical solution in the embodiment of the present invention is described in detail, but protection scope of the present invention is not limited to
The embodiment.
With reference to Fig. 1-Fig. 2, the driving motor 1 is that extrusion screw rod 2 provides input power, and the output shaft of driving motor 1 is logical
Screw 3 is crossed to connect with extrusion screw rod 2；5 upper end of mixing machine is welded with the ring flange 4 for connecting driving motor 1, described mixed
5 upper end of barrel is set there are four feed inlet, and a trunnion 6 is respectively equipped in four feed inlets, is equipped on the outside of 5 middle section of mixing machine
Temperature sensor 16,5 lower end of mixing machine are equipped with nozzle 19；Screw thread is equipped on the outside of feed inlet, trunnion is equipped with screw thread, larynx
Pipe 6 is mounted on the feed inlet of mixing machine 5 by fastening nut 7；Radiator fan 9, the heat dissipation are wrapped on the radiator 8
8 upper section of device connects pneumatic joint 10；The upper heating coil 15 and lower heating coil 17, are wrapped on the outer wall of mixing machine 5；The spray
Flow distribution plate 18 is installed, there are mixing chambers between flow distribution plate 18 and the discharge port of nozzle 19 inside mouth 19.
Four feed inlets of the mixing machine 5 respectively correspond white silk material 11, red silk material 12, yellow silk material 13 and blue
The charging proportion of 14 4 feed inlets of silk material, four kinds of silk materials is adjusted by motor speed size each in wire feeder, is realized
The free 3D printing of polychrome.Wherein three kinds of primary colors chargings of white charging and other cooperate, and increase inlet amount, improve printing effect
Rate is printed especially suitable for large-scale part；White charging simultaneously is also possible to water-soluble support materials, other three kinds of primary colors are made
For basis material, product support easily removal is printed, especially suitable for needs plus the printing of the part of support.
The driving motor 1 drives 2 bar of extrusion screw rod to complete mixing and extrusion by certain speed rotation, driving motor 1
Revolving speed determines raw silk percentage of cocoon.
4 side of ring flange is equipped with threaded hole, for fixing 3D printing head.
The radiator 8 and radiator fan 9 are feeding-passage heat dissipation, and preventing in trunnion 6 temperature, excessively high to melt colorant stifled
Feeding-passage is filled in, printing is caused to be interrupted.
The upper heating coil 15 is heated to 2 feed zone of extrusion screw rod and fluxing zone in mixing machine, guarantees that colorant is smooth
Sufficiently plasticizing mixes into mixing machine and in mixing machine；The lower heating coil 17 to 2 compression section of extrusion screw rod in mixing machine and
Mixing extruding zone is heated, and is plasticized colorant further and is uniformly mixed；Cooperation temperature sensor 16 is precisely controlled in mixing machine 5
Portion's temperature realizes polychrome 3D printing.
The feed zone preheats the colorant in mixing machine 5, is compacted and conveyed；Fluxing zone makes the color in mixing machine 5
Material is compacted and is sufficiently plasticized；Compression section is further compacted the colorant in mixing machine 5；It mixes extruding zone and utilizes extrusion screw rod 2
Several teeth of front distribution carry out shear action to colorant, are plasticized the colorant in mixing machine 5 further abundant, uniformly mixed,
Last extrusion nozzle 19.
Referring to Fig. 7-Fig. 8, the hole size H and outer diameter J of the nozzle 19 can meet different printing demands；Institute
Nozzle bore H and nozzle face width the J value for stating nozzle 19 can be selected voluntarily according to demand.Nozzle end nozzle bore H value
Size determine printing precision height, nozzle bore H value is smaller, and printing precision is higher, be suitable for fine print need
It asks；Nozzle bore H value is bigger, and unit time load is more, and printing effect is higher, and the suitable printing for being chiefly used in large-scale part needs
It asks.The J value of nozzle 19 makes 19 end of nozzle form a big plane, has pressing effect to current layer in printing, can be improved
The inter-layer bonding force of part and the density of part are printed, meets different line widths in combination with layer high setting and prints, improve printing
Efficiency.
Use the Method of printing of the compound 3D printing structure of above-mentioned polychrome, comprising the following steps:
Step 1) treats location information and colouring information that printer model progress slicing delamination obtains each layer of slicing layer,
According to the location information and colouring information generation model print data of each layer of slicing layer, store into model database；
Step 2), the model print data according to acquisition, control each wire feeder and silk material are taken to send to each feed inlet in proportion
In silk to mixing tank 5, the printing silk material in mixing tank 5 is heated to melting by heating coil, forms printing mixture；
Step 3), the model print data according to generation are moved to accordingly according to the location information control nozzle of slicing layer
Position, printing mixture is sprayed successively accumulation by nozzle and forms model to be printed by the rotation of control extrusion screw rod, to realize more
The compound 3D printing of color.
Specifically,
1) according to mold elements size, precision and print time, H the and J value of then 19 end of nozzle is selected, selectes nozzle
19；
2)-Fig. 2 referring to Fig.1, pneumatic joint 10 is connect with wire feeder, by white silk material 11, red silk material 12, yellow
Silk material 13 and blue silk material 14 are packed into four trunnions 6 by four wire feeders respectively, power on, wire feeder is connected
Connect controller；
3) each wire feeder of ratio control of mixture takes silk material to pass through pneumatic joint 10, trunnion 9 in proportion as needed
And each feeding-passage that 5 upper feeding mouth of mixing machine is formed is sent to mixing machine 5, while being opened driving motor 1 and being driven extrusion spiral shell
Bar 2 is rotated according to command speed, is heated to mixing machine 5；
4) each colorant melts preliminary blending transportation to extrusion spiral shell by the feed zone preheating of extrusion screw rod 2 in mixing machine 5
The fluxing zone of bar 2, sufficiently plasticizing mixing, and it is compacted the compression section secondary compaction thawing into extrusion screw rod 2, finally by squeezing
Several tooth shear-mixeds on the mixing extruding zone of screw rod 2 out, are further plasticized abundant, uniformly mixed.
5) printing mixture is squeezed out according to the model print data of generation, is moved according to the location information control nozzle of slicing layer
It moves to corresponding position, mixing machine 5 melts printing mixture after mixing and shunts using the flow distribution plate 18 inside nozzle 19
It is squeezed out according to quantity after current stabilization, orientation from nozzle 19, finished product needed for layer-by-layer accumulation molding；The extrusion output of printing silk material passes through extrusion screw rod
Revolving speed control.
Realize that a kind of compound 3D printing method of polychrome, the present apparatus pass through control 5 arbitrary number of mixing machine using structure of the invention
Feed inlet colorant is measured, subtracts each other principle according to subtractive primary colors, various colors can be arbitrarily mixed, theoretically in print procedure
In, it can both realize monochromatic printing, can also realize polychrome Free Printing.
Claims (10)
1. a kind of compound 3D printing structure of polychrome, which is characterized in that including mixing machine (5), nozzle (19) and extrusion screw rod (2),
Along through-hole mixing chamber is axially arranged in mixing machine (5), nozzle (19) is set to mixing machine (5) lower end, and mixing machine (5) side wall is equipped with
The feed inlet of multiple connection mixing chambers, feed inlet is interior to be equipped with trunnion (6), and silk material enters the mixing of mixing machine (5) by trunnion (6)
Intracavitary, extrusion screw rod (2) is placed in the mixing chamber of mixing machine (5), and extrusion screw rod (2) includes feed zone (A), fluxing zone (B), pressure
Contracting section (C) and mixing extruding zone (D), feed zone (A), fluxing zone (B) and compression section (C) they are the identical screw rod of major diameter of thread, into
Material section (A) and compression section (C) is even depth helicla flute, and fluxing zone (B) is gradual change deep spiral slot, and mixing extruding zone includes more
A shearing tooth for being set to extrusion screw rod (2) surface, the spiral groove depth of feed zone (A) are greater than the spiral groove depth of compression section (C)
Degree, the helicla flute depth capacity of fluxing zone (B) is identical as the spiral groove depth of feed zone (A), and the helicla flute of fluxing zone (B) is minimum
Depth is identical as the spiral groove depth of compression section (C), mixes outside the maximum shear tooth outer diameter of extruding zone and the screw thread of feed zone (A)
Diameter is identical；Trunnion (6) is located at the feed zone that the feed inlet in mixing machine (5) is located at extrusion screw rod (2)；Extrusion screw rod (2) upper end
It is driven by driving device.
2. the compound 3D printing structure of a kind of polychrome according to claim 1, which is characterized in that shearing tooth is perpendicular to extrusion
The column of screw rod (2) surface setting.
3. the compound 3D printing structure of a kind of polychrome according to claim 1, which is characterized in that driving device includes driving electricity
Machine (1), mixing machine (5) upper end outside are fixed with ring flange (4), and the shell of the output shaft end of driving motor (1) is equipped with connection
Flange, connecting flange are bolted with ring flange (4), the output shaft of driving motor (1) and extrusion screw rod (2) fixed company
It connects.
4. the compound 3D printing structure of a kind of polychrome according to claim 3, which is characterized in that the output of driving motor (1)
Axis is equipped with radial screw bore；One end of extrusion screw rod (2) is equipped with the output shaft mounting hole being axially arranged, extrusion screw rod (2) side
Wall offers the radial through-hole of connection output shaft mounting hole, and the output shaft of driving motor (1) is placed in output shaft mounting hole, driving
It is fastened with the output shaft on extrusion screw rod (2) by screw (3) on motor (1) output shaft.
5. the compound 3D printing structure of a kind of polychrome according to claim 1, which is characterized in that further include being wrapped in trunnion
(6) radiator (8) on the outside of, radiator (8) side are equipped with radiator fan (9), and one end of trunnion (6) is connected with to be sent for connecting
The pneumatic joint (10) of silk mechanism.
6. the compound 3D printing structure of a kind of polychrome according to claim 1, which is characterized in that be equipped on the outside of mixing machine (5)
Heating coil and temperature sensor (16).
7. the compound 3D printing structure of a kind of polychrome according to claim 6, which is characterized in that heating coil includes upper heating coil
(15) it is wrapped on the outer wall of mixing machine (5) with lower heating coil (17), upper heating coil (15) and lower heating coil (17), temperature sensing
Device (16) is set between heating coil (15) and lower heating coil (17).
8. the compound 3D printing structure of a kind of polychrome according to claim 1, which is characterized in that be fixed in nozzle (19) point
Flowing plate (18), flow distribution plate offer multiple tap holes on (18).
9. the compound 3D printing structure of a kind of polychrome according to claim 1, which is characterized in that the screw thread of extrusion screw rod (2)
The difference of outer diameter and mixing chamber internal diameter is 0.1-1mm, between the axis of trunnion (6) and the axis of mixing machine (5) angle be 40 °-
60°。
10. a kind of compound 3D printing method of polychrome based on print structure described in claim 1, which is characterized in that including following
Step:
Step 1) treats location information and colouring information that printer model progress slicing delamination obtains each layer of slicing layer, according to
The location information and colouring information generation model print data of each layer of slicing layer, store into model database；
Step 2), the model print data according to generation, control each wire feeder take in proportion silk material to each feed inlet wire feed extremely
It carries out being mixed to form printing mixture in mixing tank (5)；
Step 3) squeezes out printing mixture according to the model print data of generation, controls nozzle according to the location information of slicing layer
It is moved to corresponding position, printing mixture is sprayed successively accumulation by nozzle and forms model to be printed by the rotation of control extrusion screw rod,
To realize the compound 3D printing of polychrome.
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