CN107671293A - The double shower nozzle powdered feed 3D printing equipments of one kind mixing extrusion continous way - Google Patents
The double shower nozzle powdered feed 3D printing equipments of one kind mixing extrusion continous way Download PDFInfo
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- CN107671293A CN107671293A CN201710670327.3A CN201710670327A CN107671293A CN 107671293 A CN107671293 A CN 107671293A CN 201710670327 A CN201710670327 A CN 201710670327A CN 107671293 A CN107671293 A CN 107671293A
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- 238000001125 extrusion Methods 0.000 title claims abstract description 51
- 238000010146 3D printing Methods 0.000 title claims abstract description 43
- 238000002156 mixing Methods 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 59
- 238000007639 printing Methods 0.000 claims abstract description 36
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 10
- 238000009877 rendering Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002861 polymer material Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 22
- 239000004615 ingredient Substances 0.000 abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 14
- 239000000843 powder Substances 0.000 description 11
- 239000011230 binding agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/005—Loading or unloading powder metal objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
Abstract
The present invention discloses a kind of double shower nozzle powdered feed 3D printing equipments of mixing extrusion continous way, is made up of side drawing-in device, print platform, fixed support plate and 3D printing frame；The side drawing-in device is fixed on fixed support plate, print platform is fixed on the crossbeam of 3D printer frame, 3D printing frame includes stepper motor and along X, Y, the guide rail of Z axis motion, print platform can move along the rail, print platform is flexibly connected with fixed support plate, side drawing-in device includes double screw extruder, the present invention, which solves the equipment of single nozzle feeding 3D printing in the prior art, to print base substrate and support with same material, blank sintering rear support material and base substrate are easily fixedly arranged at one piece of technical problem, twin-screw side feeding is realized while conveying major ingredient, while conveying support material, realize the printing to labyrinth shaped piece, improve the uniformity of material mixing, improve molding blank precision.
Description
Technical field
The present invention relates to 3D printing field, more particularly to a kind of double shower nozzle powdered feed 3D printing dresses of mixing extrusion continous way
It is standby.
Technical background
At present, the existing a variety of moulding process of three-dimensional printing technology, 3D printing technique at present oneself turn into the whole world most pay close attention to it is new
One of emerging technology.This new mode of production will promote the reality of the third time industrial revolution together with other Digitalisation Manufacture Modes
It is existing.It is printed material to restrict the wherein one big bottleneck that 3D printing technique develops rapidly, particularly metallic print material.Research and development and life
The metal material that production performance is more preferable and versatility is stronger is the key for lifting 3D printing technique.Directly adopted in high-performance metal component
With 3D printing technique manufacture view, it is necessary to particle diameter is thin, uniform particle sizes, high sphericity, all kinds of metal dusts of low oxygen content, and
The requirement of its Forming Quality is high, surface fine, and for metal dust without being wrapped completely, mixing is uneven in the prior art, right
It is relatively low that the molding blank of printing carries out impact displacement, tensile strength, hardness, elongation percentage physical and mechanical properties.
Chinese patent 201610655450.3 discloses a kind of twin-jet nozzle 3D printer head device, including：Spray
Nozzle assembly (1) and nozzle assembly (20), wherein, nozzle assembly (1) is inserted into radiator (2), is locked by machine-processed rice screw；It hurry up
Joint (9) is by spinning or gluing mode is assembled on radiator (2)；Nozzle assembly (20) is inserted into radiator (19)
In, locked by machine-processed rice screw；Fast joint (10) is by spinning or gluing mode is assembled on radiator (19)；Radiator
(2) it is assembled together by screw and radiator yoke plate (6)；Radiator (19) is assembled to by screw and radiator yoke plate (17)
Together.The feelings that the print qualities such as model is defiled, staggered floor occurs, model comes off decline or even printing fails can effectively be eliminated
Condition.201310719206.5 disclose a kind of melt differential three-dimensional printer, mainly by material melts unit, droplet ejection list
Member, cylindrical-coordinate system forming unit and frame are formed；In material melts unit, servomotor drive screw rotates, in machine barrel
Fixed heater ensures that pellet plastifies completely by temperature adjusting, and fused materials are by screw rod transmission to droplet ejection unit；
In droplet ejection unit, fused materials are transported in valve body along the hot flow path in runner plate, and linear servo-actuator valve needle exists
Move back and forth, fused materials are quantified, intermittently extrusion nozzle in valve body, form melt droplet；It is molded in cylindrical-coordinate system single
In member, cool down deposition modeling on melt droplet ejection to plummer, left and right, vertical direction servomotor respectively with corresponding screw rod
Engagement is rotated to drive material melts unit and droplet ejection unit to be moved along left and right, vertical direction, and circumferential servomotor passes through
Worm drive is equipped with the plummer rotation of worm gear, realizes the three-dimensional motion under cylindrical-coordinate system.But due to wire drawing machine extrusion
Strands toughness is low, and print procedure is easily broken, due to chip effect can only specific material, easily wind in print procedure.
201520753192.3 disclose a kind of fused deposition 3D printer with assembled screw rod, including pedestal, elevating mechanism, beat
Print platform and extrusion mechanism, the print platform are installed on pedestal, and the extrusion mechanism is installed on printing by elevating mechanism
Above platform, the extrusion mechanism includes machine barrel, combined type extrusion screw rod and main hopper, and the main hopper is installed on the upper of machine barrel
End, the combined type extrusion screw rod include extrusion screw rod main body, extrusion screw rod head and extrude check ring, the extrusion screw rod head,
Extrusion check ring and extrusion screw rod main body are mounted on machine barrel, and the extrusion screw rod head, extrusion check ring and extrusion screw rod master
Body is distributed from bottom to top in the extruding cavity of machine barrel；The upper end of the extrusion screw rod head passes through extrusion check ring and extrusion screw rod main body
Lower end connection, the upper end of the extrusion screw rod main body is connected with extruder motor；The present invention dismounting and repair it is very convenient, and make
Cause low.But the fused deposition 3D printer of the assembled screw rod and single nozzle feeding 3D printing of the prior art equipment one
Sample, same material printing base substrate and support can only be used, easily be fixedly arranged at one piece to blank sintering rear support material and base substrate, and
Billet surface after printing is rougher.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of double shower nozzle powdered feed 3D of mixing extrusion continous way
Printing equipment, so that above mentioned problem is improved.
To achieve these goals, the embodiment of the present invention adopts the following technical scheme that realization：
The double shower nozzle powdered feed 3D printings equipments of mixing extrusion continous way are by side drawing-in device, print platform, solid
Determine supporting plate and 3D printing frame composition；
The side drawing-in device is fixed on fixed support plate, and print platform is fixed on the crossbeam of 3D printing frame III
On, print platform is flexibly connected with fixed support plate；
The annexation of the side drawing-in device right half part is：Stepper motor I is connected with decelerator a, locks facing
Decelerator a is locked, decelerator a is connected by shaft coupling with gear-box, and gear-box is connected with the right-hand member of twin-screw external barrel I；Side
Side drawing-in device is fixed on fixed support plate by fixed support, and fixed support plate is supported on 3D printer by fixed corner fittings
On frame, 3D printing frame includes stepper motor II and the guide rail moved along X, Y, Z axis；Print platform can move along the rail, printing
Platform includes print platform supporting plate；
The twin-screw external barrel I is provided with heating collar a, the left end of twin-screw external barrel I by ring flange converting interface with
Fixation an actor's rendering of an operatic tune of single screw rod external barrel II is vertically connected, and heating rod is inserted into inside fixed an actor's rendering of an operatic tune；The side drawing-in device
Right half part of the left-half with removing side feeding remaining structure it is symmetrical, motor locking cover locking decelerator a, motor with
Decelerator b connections, single screw rod external barrel II are provided with heating collar b, and the bottom of single screw rod external barrel II is provided with pressurize an actor's rendering of an operatic tune, single spiral shell
The discharging opening end of bar external barrel II is provided with printing head, and printing head is provided with air valve thimble.
The side drawing-in device drives twin-screw to rotate by motor driven decelerator a by shaft coupling, then by bevel gear
Engagement makes the incorgruous rotation of twin-screw, is rotated by single screw rod helical feed by ring flange converting interface, passed through under pressure and temperature
Pressurize chamber runner, material is transported at nozzle.The device realizes that such as Fig. 2 leftmost nozzles conveying supporting material, the right carry double spiral shells
The nozzle print major ingredient of bar, realizes the printing to labyrinth shaped piece, and twin-screw side feeding improves the uniform of material mixing
Property, played a key effect to improving molding blank precision.
The heating collar a of the symmetrical single part of side drawing-in device is one, and heating collar b is three.
The twin-screw is incorgruous rotation.
It is as follows that the double shower nozzle powdered feed 3D printing equipments of this mixing extrusion continous way prepare moulding process：
1. 150 DEG C -180 DEG C or so by metal dust and high polymer material (PLA, PP, POM, SA, EVA, SA) in double spiral shells
Heat drives twin-screw mixed material by motor by shaft coupling altogether for bar mixing, material is first well mixed；Twin-screw rotating speed is
10r/min-40r/min；
2. and then extruded again by Single screw extrusion by nozzle, rotating speed in 5r/min-25r/min, 35 DEG C of platform temperature-
45 DEG C, polymer melting temperature is 155 DEG C -185 DEG C, and leftmost nozzle conveying supporting material, the right carries the nozzle print of twin-screw
Major ingredient；
3. the metallic article with high accuracy and high surface finish can be obtained using degreasing-sintering process after optimization,
Skimming temp is 100 DEG C -500 DEG C, 800 DEG C -1380 DEG C of sintering temperature.
4. when printing plus the base substrate of backing material, it can facilitate after blank forming and soluble support materials are dismantled, obtain
To stainless steel moulded products.
The double shower nozzle powdered feed 3D printing equipments of this mixing extrusion continous way are than being beaten using single nozzle and with same material
Hand-pressing body and support will get well, and overcome and one piece is fixedly arranged to blank sintering rear support material and base substrate, mixing extrusion continous way is double
Shower nozzle powdered feed 3D printing equipment is easy to support to remove after blank sintering and adhesion is on base substrate；Improve printing
Precision, break through the limitation of homogenous material, the printing of a variety of composites can be mixed so that printing cost reduce.
Technical scheme at least has the following advantages that and beneficial effect：
1. the present invention by said apparatus, solves the equipment of single nozzle feeding 3D printing in the prior art can only be with same
Material prints base substrate and support, and blank sintering rear support material and base substrate are easily fixedly arranged at one piece of technical problem, for printing
Picture stainless steel with support, ceramic, after copper slurry blank forming, degreasing sintered rear support easily removes, and improves precision, combination
One piece is easily consolidated into after formula single nozzle sintering, is easily destroyed body；
2. the device realizes that leftmost nozzle conveys supporting material, the right carries the nozzle print major ingredient of twin-screw, realizes to multiple
The printing of miscellaneous structure special-shaped part, twin-screw side feeding improve the uniformity of material mixing, are played to improving molding blank precision
Key effect；
3. the device can facilitate after blank forming and soluble support materials are torn open when printing plus the base substrate of backing material
Fall, than printing base substrate using single nozzle and with same material and supporting good, blank sintering rear support material and base substrate consolidation
It is overcome one piece the problem of, the double shower nozzle powdered feed 3D printings equipments of mixing extrusion continous way are easy to after blank sintering
Support is removed and adhesion is on base substrate.The precision of printing is improved, breaks through the limitation of homogenous material, can be mixed a variety of multiple
The printing of condensation material so that printing cost reduces；
4. base substrate and combined type single screw rod feeding single nozzle molding blank that the double shower nozzles of mixing extrusion continous way are printed
Every physical and mechanical properties all increases with the increase of stainless steel content；
5. the present invention can also be printed as a variety of composites of the graininess such as ceramics, TPU, copper slurry etc, breach
Original printer can only print the limitation of wire rod, expand the scope of 3D printing material requested significantly；
6. when a nozzle operation, the air valve thimble of another nozzle can prevent the outflow of material, solve and beat
The gravity flow of material during print, improves printing precision, while save material；
7. the present invention can print hanging base substrate, the low soluble support of bottom cost, body is printed with major ingredient, drop
Low cost, overcoming single injector can only print from the accumulation of bottom in layer, and support is difficult to peel off, destructible body；
8. pressurize die cavity runner uses ' U ' type runner, play buffering barrel pressure and feed pressure is stable so that material
Uniformly conveying, it is not easy to putty；
9. using twin-screw side feeding extrusion, wherein using incongruous double screw mixing extrusion way so that material is mixing
With enough discharge pressures during conveying, solves phenomenon under feeding, and composite mixing is more uniform, improves and beats
Precision is printed, solves the problems, such as that conventional printer precision is low；And use single twin-screw side feeding, another part without using
Twin-screw side feeding, processing cost is reduced, and print and support without using twin-screw side feeding part, the support of printing
Differ with body precision, support is more easily peelable and identifies；
10. single nozzle has the problem of support is difficult to remove after being printed upon printing idiosome：When dynamics is inadequate, support is difficult to
Remove；And it is firmly excessive, model can be destroyed.The present invention can use two kinds of characteristic difference materials using double nozzle printing modes
Material is printed, and support can use the materials such as water solubility, easily remove, and is difficult to support after effectively solving blank forming
Problem.
11. the strands toughness for overcoming wire drawing machine extrusion in the prior art is low, print procedure is easily broken, and in general strands are beaten
Print machine due to chip effect can only specific material, in print procedure easily winding the problem of.
Brief description of the drawings
Fig. 1 is that the double shower nozzle powdered feed 3D printing three dimensional device structure top views of continous way are extruded in the mixing；
Fig. 2 is the side drawing-in device structure top view；
Fig. 3 is the equipment lower junction composition；
Fig. 4 is the equipment twin-screw extrusion partial appearance structure chart；
Fig. 5 is that the double shower nozzle powdered feed 3D printings equipment process charts of continous way are extruded in the mixing；；
Fig. 6 is metal dust and binding agent mixed sweep electron microscope；
(a) combined type single screw rod feeding single nozzle extrusion metal dust mixes with binding agent
(b) the double shower nozzle metal dusts of mixing extrusion continous way mix with binding agent；
Fig. 7 is printing base substrate figure；
(a) the double nozzle printing base substrates of combined type single screw rod feeding single nozzle molding blank (b) mixing extrusion continous way；
Different stainless steel parts contain under the conditions of Fig. 8 is combined type single screw rod feeding single nozzle and mixes the double shower nozzles of extrusion continous way
The physical and mechanical properties figure of sample after the lower sintering of amount；
Wherein, parts title corresponding to reference is as follows：
I-side drawing-in device, II-print platform, III -3D printing frame, IV- fixed support plates, 1- motors, 2- chargings
Cylinder, 3- electromechanical locks tight sets, 4- decelerators b, 5- single screw rod, 6- locking facings, 7- sensor interfaces, 8- heating rods, 9- fix row
Chamber, 10- heating collars a, 11- fixed support, 12- twin-screws, 13- gear-boxes, 14- shaft couplings, 15- locking facings, 16- decelerators
A, 17- stepper motor I, 18- machine barrels I, 19- heating collars b, 20- machine barrel II, 21- pressurize an actor's rendering of an operatic tune, 22- printing heads, 23- air valves
Thimble, 24- fix corner fittings, 25- guide rails, 26- print platform supporting plates, 27- stepper motors II.
Specific embodiment
The present invention will be described with specific embodiment below in conjunction with the accompanying drawings.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing, to the present invention
Technical scheme in embodiment carries out clear, complete description.Obviously, described embodiment is the part implementation of the present invention
Example, rather than whole embodiments.
Therefore, the model of claimed invention is not intended to limit to the detailed description of embodiments of the invention below
Enclose, but be merely representative of the section Example of the present invention.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of protection of the invention.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent accompanying drawing in individual accompanying drawing.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer ", " back side " be based on orientation shown in the drawings or position relationship,
Either the invention product using when the orientation usually put or position relationship.This kind of term is for only for ease of the description present invention
Described with simplifying, rather than the device or element of instruction or hint meaning there must be specific orientation, with specific orientation structure
Make and operate, therefore be not considered as limiting the invention.
It should also be noted that, in the description of the invention, unless otherwise clearly defined and limited, term " setting ",
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or one
Connect body；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirect by intermediary
It is connected, can is the connection of two element internals.To those skilled in the art, can understand as the case may be above-mentioned
The concrete meaning of term in the present invention.
As Figure 1-4, the side feeding 3D printing equipment is by side drawing-in device I, print platform II, fixed support
Plate IV and 3D printing frame III form；
The side drawing-in device I is fixed on fixed support plate IV, and print platform II is fixed on 3D printing frame III
On crossbeam, print platform II is flexibly connected with fixed support plate IV；
The annexation of the right half part of side drawing-in device I is：Stepper motor I 17 is connected with decelerator a 16, lock
Tight facing 15 locks decelerator a 16, and decelerator a 16 is connected by shaft coupling 14 with gear-box 13, gear-box 13 and twin-screw
The right-hand member of 12 external barrel I 18 connects；Side drawing-in device I is fixed on fixed support plate IV by fixed support 11, fixed branch
Fagging IV is supported in 3D printing frame III by fixed corner fittings 24,3D printing frame III include stepper motor II 27 and along X, Y,
The guide rail 25 of Z axis motion；Print platform II can move along guide rail 25, and print platform II includes print platform supporting plate 26；
As shown in Fig. 2 the external barrel of twin-screw 12 is provided with heating collar a 10, the external barrel left end of twin-screw 12 passes through
Fixation an actor's rendering of an operatic tune 9 of ring flange converting interface and the external barrel II of single screw rod 5 is vertically connected, and heating rod 8 is inserted into fixed an actor's rendering of an operatic tune 9
Portion；The remaining structure of right half part of the left-half of the side drawing-in device I with removing side feeding is symmetrical, motor locking
The locking decelerator of set 3 b 4, motor 1 is connected with decelerator b 4, and the external barrel II 20 of single screw rod 5 is provided with heating collar b 19, single spiral shell
The bottom of 5 external barrel of bar II is provided with pressurize an actor's rendering of an operatic tune 21, and the discharging opening end of 5 external barrel of single screw rod II is provided with printing head 22, beaten
Print head 22 is provided with air valve thimble 23.
The heating collar a 10 of the I symmetrical single part of side drawing-in device is one, and heating collar b 19 is three
It is individual.
The twin-screw 12 is incorgruous rotation.
As shown in figure 5, the double shower nozzle powdered feed 3D printing equipments of this mixing extrusion continous way prepare moulding process flow process such as
Under：
1. metal dust and high polymer material are carried out into blending granulation, the double sprays of continous way are extruded by the mixing of independent research
Head powdered feed 3D printing equipment, realizes the melt conveying of uniform, controllable, at low temperature by successively accumulating, realizes to shaped piece
The functionalization printing of base substrate；First 150 DEG C -180 DEG C or so by metal dust and high polymer material (PLA, PP, POM, SA,
EVA, SA) double-screw mixing amount to heat by motor by shaft coupling drive twin-screw mixed material, material is first well mixed；It is double
Screw speed is 10r/min-40r/min；
2. and then extruded again by Single screw extrusion by nozzle, rotating speed in 5r/min-25r/min, 35 DEG C of platform temperature-
45 DEG C, polymer melting temperature is 155 DEG C -185 DEG C, and leftmost nozzle conveying supporting material, the right carries the nozzle print of twin-screw
Major ingredient；
3. degreasing-sintering process after optimization is recycled to obtain the metal system with high accuracy and high surface finish
Product, skimming temp are 100 DEG C -500 DEG C, 800 DEG C -1380 DEG C of sintering temperature；
4. when printing plus the base substrate of backing material, it can facilitate after blank forming and soluble support materials are dismantled, obtain
To stainless steel moulded products.
Single nozzle printer metal dust is understood from Fig. 6 (a) without being wrapped completely, mixing is uneven, influences product
Formed precision, it can be seen that binding agent is uniformly wrapped in metal dust from Fig. 6 (b), metal powder granulates and particle it
Between contact with each other in the case of, the gap of the full metal powder granulates of Binder Composition filling and metal powder granulates, show binding agent
Optimal with metal dust mixed effect, the formed precision of product is high.
At 175 DEG C same of feeding temperature, extruded velocity 6rmin-1, when workbench temperature is 45 DEG C, base substrate
Formed precision such as Fig. 7, mixing extrusion continous way twin-screw Pouring oar is higher than single screw rod feeding formed precision, demonstrates material
Scattered uniformity.
The double shower nozzles of mixing extrusion continous way are can be seen that from the physical and mechanical properties comparison diagram of sample after Fig. 8 sintering to beat
The base substrate of print is with every physical and mechanical properties of combined type single screw rod feeding single nozzle molding blank with the increasing of stainless steel content
Add and all increase；
(1) from Fig. 8 (a), with the increase of stainless steel powder content, the impact displacement of molding blank slowly declines, but
It is that the double shower nozzles of mixing extrusion continous way print base substrate to impact Displacement Ratio combined type single screw rod feeding single nozzle molding blank small,
When the content of stainless steel powder reaches 97.5%, the impact displacement of two kinds of molding blanks is more or less the same.
(2) from Fig. 8 (b), with the increase of stainless steel powder content, the tensile strength of molding blank is slowly increased, and is mixed
Close the double shower nozzles of extrusion continous way, the explanation bigger than combined type single screw rod feeding single nozzle molding blank that print base substrate tensile strength
The former mechanical performance of base substrate is more better than the latter molding blank, and when stainless steel powder content reaches 97.5%, two kinds into parison
The tensile strength of body is more or less the same, and performance is similar.
(3) from Fig. 8 (c), with the increase of stainless steel powder content, the hardness of molding blank is slowly increased, and mixing is squeezed
Go out the double shower nozzles of continous way, the physical and mechanical properties bigger than combined type single screw rod feeding single nozzle molding blank that print base substrate hardness
Preferably, when the content of stainless steel powder reaches 97.5%, the hardness of two kinds of molding blanks is more or less the same.
(4) from Fig. 8 (d), with the increase of stainless steel powder content, the elongation percentage of molding blank slowly declines, still
It is smaller than combined type single screw rod feeding single nozzle molding blank that the double shower nozzles of mixing extrusion continous way print base substrate elongation percentage, explanation
The former physical and mechanical properties is better, when the content of stainless steel powder reaches 97.5%, the elongation percentage phase of two kinds of molding blanks
Poor little, mechanical performance is more or less the same.
Embodiments above is merely to illustrate the technical scheme being not intended to limit the present invention.Any of spirit of the present invention is not departed from
Modification or local replacement, all should cover among scope of the presently claimed invention.
Claims (4)
1. the double shower nozzle powdered feed 3D printing equipments of one kind mixing extrusion continous way, it is characterised in that：
The double shower nozzle powdered feed 3D printing equipments of mixing extrusion continous way are by side drawing-in device, print platform, fixed branch
Fagging and 3D printing frame composition；
The side drawing-in device is fixed on fixed support plate, and print platform is fixed on the crossbeam of 3D printing frame III, is beaten
Print platform is flexibly connected with fixed support plate；
The annexation of the side drawing-in device right half part is：Stepper motor I is connected with decelerator a, locking facing locking
Decelerator a, decelerator a are connected by shaft coupling with gear-box, and gear-box is connected with the right-hand member of twin-screw external barrel I；Feed side
Material device is fixed on fixed support plate by fixed support, and fixed support plate is supported on 3D printing frame by fixed corner fittings
On, 3D printing frame includes stepper motor II and the guide rail moved along X, Y, Z axis；Print platform can move along the rail, and printing is flat
Platform includes print platform supporting plate；
The twin-screw external barrel I is provided with heating collar a, and the left end of twin-screw external barrel I passes through ring flange converting interface and single spiral shell
Fixation an actor's rendering of an operatic tune of bar external barrel II is vertically connected, and heating rod is inserted into inside fixed an actor's rendering of an operatic tune；A left side for the side drawing-in device
The remaining structure of right half part of the half part with removing side feeding is symmetrical, motor locking cover locking decelerator a, and motor is with slowing down
Device b connections, single screw rod external barrel II are provided with heating collar b, and the bottom of single screw rod external barrel II is provided with pressurize an actor's rendering of an operatic tune, outside single screw rod
The discharging opening end of portion's machine barrel II is provided with printing head, and printing head is provided with air valve thimble.
2. the double shower nozzle powdered feed 3D printing equipments of a kind of mixing extrusion continous way according to claim 1, its feature exist
In：The heating collar a of the symmetrical single part of side drawing-in device is one, and heating collar b is three.
3. the double shower nozzle powdered feed 3D printing equipments of a kind of mixing extrusion continous way according to claim 2, its feature exist
In：The twin-screw is incorgruous rotation.
4. the double shower nozzle powdered feed 3D printing equipments of continous way are extruded according to a kind of any described mixing of claim 1-3, its
It is characterised by：The preparation technology of its product is as follows：
(1) 150 DEG C -180 DEG C or so by metal dust and high polymer material (PLA, PP, POM, SA, EVA, SA) in twin-screw
Heat drives twin-screw mixed material by motor by shaft coupling altogether for mixing, material is first well mixed；Twin-screw rotating speed is 10r/
min-40r/min；
(2) and then again extruded by Single screw extrusion by nozzle, rotating speed is in 5r/min-25r/min, 35 DEG C -45 of platform temperature
DEG C, polymer melting temperature is 155 DEG C -185 DEG C, and leftmost nozzle conveying supporting material, the right carries the nozzle print master of twin-screw
Material；
(3) metallic article with high accuracy and high surface finish, degreasing can be obtained using degreasing-sintering process after optimization
Temperature is 100 DEG C -500 DEG C, 800 DEG C -1380 DEG C of sintering temperature.
(4) when printing plus the base substrate of backing material, it can facilitate after blank forming and soluble support materials are dismantled, obtain not
Become rusty steel moulded products.
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| CN201710670327.3A CN107671293A (en) | 2017-08-08 | 2017-08-08 | The double shower nozzle powdered feed 3D printing equipments of one kind mixing extrusion continous way |
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|---|---|---|---|
| CN201710670327.3A CN107671293A (en) | 2017-08-08 | 2017-08-08 | The double shower nozzle powdered feed 3D printing equipments of one kind mixing extrusion continous way |
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| CN111230122A (en) * | 2020-03-13 | 2020-06-05 | 江苏精研科技股份有限公司 | Multi-region composite material powder forming process based on 3D printing |
| CN115070059A (en) * | 2022-05-30 | 2022-09-20 | 大连理工大学 | Indirect 3D printing forming method for magnetically soft alloy MIM feeding and 3D printer thereof |
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