WO2015189661A1 - Extruder for fused filament fabrication 3d printer - Google Patents

Extruder for fused filament fabrication 3d printer Download PDF

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Publication number
WO2015189661A1
WO2015189661A1 PCT/IB2014/062163 IB2014062163W WO2015189661A1 WO 2015189661 A1 WO2015189661 A1 WO 2015189661A1 IB 2014062163 W IB2014062163 W IB 2014062163W WO 2015189661 A1 WO2015189661 A1 WO 2015189661A1
Authority
WO
WIPO (PCT)
Prior art keywords
filament
pinch wheel
unit according
printer
feeder unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2014/062163
Other languages
English (en)
French (fr)
Inventor
Teruo Hishiki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rhombus International Technologies Ltd
Original Assignee
Rhombus International Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rhombus International Technologies Ltd filed Critical Rhombus International Technologies Ltd
Priority to PCT/IB2014/062163 priority Critical patent/WO2015189661A1/en
Priority to JP2017517435A priority patent/JP6643553B2/ja
Priority to CN201480080359.2A priority patent/CN106660267B/zh
Publication of WO2015189661A1 publication Critical patent/WO2015189661A1/en
Priority to US15/372,379 priority patent/US20170157826A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/266—Means for allowing relative movements between the apparatus parts, e.g. for twisting the extruded article or for moving the die along a surface to be coated
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • B29C48/2886—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules of fillers or of fibrous materials, e.g. short-fibre reinforcements
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • B29C48/2888—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules in thread form or in strip form, e.g. rubber strips
    • 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
    • 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]
    • 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
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/02—Small extruding apparatus, e.g. handheld, toy or laboratory extruders

Definitions

  • This invention relates to additive manufacturing systems, more particularly the extrusion head mechanism, or extruder, of a fused filament fabrication system.
  • Fused Filament Fabrication is one of several known methods of 3D printing, where physical components can be manufactured directly from a 3D CAD (Computer Aided Design) model using an additive approach where material is deposited on a horizontal building surface layer by layer. Such layers are typically between 0.05 to 1.0 mm thick depending on the technology used and interpreted by translating 'slices' of the 3D CAD model into movement of an extrusion head for depositing material.
  • the deposition technology is extrusion of polymer via an extruder, whereby a polymer filament is fed by a feeding unit into a heated nozzle and extruded in melted form into a string through a vertically oriented nozzle onto the horizontal building surface.
  • the space between the printing nozzle and the building surface determines the layer thickness.
  • a common aim for 3D printers is to achieve the finest possible build resolution in the shortest possible time.
  • the resolution of the build is proportional to the nozzle diameter and layer thickness.
  • the speed of the build is proportional to the speed of extrusion of molten material from the nozzle which is determined by nozzle area and maximum volume of extruded molten material per second. Extrusion speed is determined by volume of extruded molten material divided by area of extruded molten string of material.
  • the resolution of the build is doubled by smaller size of the nozzle, the speed of the build slows down by a factor 4. This resolution vs. build speed dilemma makes speed of extrusion a critical factor in improvement.
  • a key subsystem in a fused filament fabrication 3D printer is the extruder.
  • One type of extruder is the screw type, described in US5764521 , where polymer material is fed into a heated feeder with a rotating feeding screw, which is able to extrude molten polymer at high pressure through to a nozzle.
  • this type is typically capable of achieving high extrusion pressure, an important drawback is its weight which limits acceleration in the x-y plane and therefore overall printing speed.
  • Another drawback is the large size of the screw mechanism, which makes it difficult to install into the 3D printer.
  • a different type of extruder more commonly and preferably used consists of a 'cold' end having a filament feeder unit and a 'hot' end having a heated extrusion nozzle.
  • the feeder pulls filament material off a supply roll and feeds it by pressure into the heated nozzle which consists of essentially a heated tube.
  • the feeder unit design is critical, and several variants are known: The most commonly used method is to feed the filament in a straight line between a driven pinch wheel and a sprung pressure plate or idler wheel.
  • the pinch wheel can be knurled, toothed, hobbed or otherwise treated to increase the friction and therefore traction force applicable on the filament.
  • a toothed pinch wheel where the tooth profile is concave to provide a line contact with the filament instead of a point contact would be preferable. Extrusion of thinner melted material at higher feed-rates is desired for high resolution and faster build speed.
  • an improved extruder head for a fused filament fabrication 3D printer which has a lightweight construction and enables extrusion of thinner extruded material at a higher extrusion speed without any slippage in filament feeding mechanism, thereby allowing higher overall building speed of the 3D printer.
  • Higher feed-rate of the filament material is achieved by increased usable friction between pinch wheel and filament by increasing the grippable area of the filament. This is done by feeding the filament into the feeding mechanism at an angle different to the outlet angle and routing it around the pinch wheel, back-supported by a plurality of support rollers, so that the filament is in frictional contact with the pinch wheel along a greater part of its circumference, thereby increasing the surface contact area between the pinch wheel and the filament.
  • nominal volume of extruded material is exactly the same as desired volume with high filament feeding rate.
  • Fig. 1 shows a schematic layout of a 3D printer indicating the extruder head in relation to other key components.
  • Fig. 2 shows a 3D view of the extruder
  • Fig. 3 shows an exploded view of the extruder
  • Fig. 4 shows an exploded view of the extruder cold end
  • Fig. 5 shows a cross-sectional drawing of the extruder
  • Fig. 6 shows a detail of the extruder hot end.
  • Fig. 7 shows an embodiment with 180 degree filament contact angle
  • a 3D printer 27 having a horizontal build surface 29 movable in the horizontal Y direction guided by linear guide 35, and an extruder head 3 arranged on a horizontal beam 32 to be movable in the horizontal x and vertical z directions, and a filament feed roll 28 arranged on support beam 34 above the maximum movement of extruder body 3 on a rotation axle in order to freely dispense of filament indicated at 23 on demand into the extruder body 3 via filament inlet 14.
  • the extruder head generally comprises a cold end 25 and a hot end 26.
  • the cold end comprises an extruder body 3 which houses a filament feed unit for pulling filament 23 off feed roll 28 and pushing it into the hot end 26 via hot end pipe 16 into heater block 19 where it is liquefied by heat created by heater 21. Temperature is monitored by a temperature sensor 20 and fed back into a computer control unit which is not shown.
  • a stepping motor 1 Connected to the cold end is a stepping motor 1 , mounted on a motor mount 2 which is connected to the extruder body 3. Attached to motor mount 2 is a cold end heat sink 7 and cooling fan 6.
  • a worm gear 4 driven by stepping motor 1.
  • the worm gear 4 drives worm wheel 12 which is connected to pinch wheel 10 via pinch wheel shaft 11.
  • the pinch wheel 10 is equipped with gripping means, preferably teeth, to maximise the pulling or pushing force on the filament 23.
  • gripping means preferably teeth
  • the support rollers 9a, 9b and 9c in the preferred embodiment are preferably ball bearings of the same size and preferably distributed equally along an arc shape at equal centre distances d 31 from pinch wheel 10 and spaced from the pinch wheel 10 so that the gap between them forms a conduit suitable to receive and guide a filament 23 tight enough to give the pinch wheel 10 appropriate driving friction against filament 23. There may be an additional guide groove 39 to help the filament finding its way through the filament conduit.
  • the centre points of the support rollers 9a and 9c and the centre point of pinch wheel 10 define a filament contact angle v 30.
  • the filament contact angle v 30 is what defines the total grippable area by pinch wheel 10 on the filament 23.
  • the force between pinch wheel 10 and filament 23 is defined by the gap between support rollers 9a, 9b, 9c and pinch wheel 10.
  • the gap is smaller than the size of the filament 23, which forces the pinch wheel 10 to dig into the filament against the support force of support wheels 9a - 9c. Therefore what defines the total available pulling or pushing force of pinch wheel 10 on filament 23 is defined by the filament contact angle v and the gap between pinch wheel 10 and support rollers 9a, 9b and 9c.
  • Hot end pipe leads the filament 23 from the cold end 25, where it is in a solid state, into the hot end 26 where it is liquefied by heat generated by heater 21 inside heater block 19 and finally extruded in liquid form through nozzle 22.
  • a hot end heat sink 18 to remove heat from the top end of hot end pipe 16, and a thermal insulator 17 to insulate the extruder body 3 from remaining heat in hot end pipe 16 and hot end heat sink 18.
  • the number of support rollers generally indicated at 9 may vary depending on the size of them or the filament contact angle 30 desired. Therefore the distance between support rollers 9 may be shorter or longer depending on need.
  • the distance between support rollers 9 may be shorter or longer depending on need.
  • it is imaginable that only two support rollers may be used as long as the filament contact angle v 30 is longer than if using only one support roller.
  • Support roller 9e may in this case, having 6 support rollers 9 giving a filament contact angle v 30 of 180 degrees, have to be larger to allow a sufficiently large bending radius of filament 23.
  • the support rollers generally indicated at 9 may be substituted by a general support means of low friction.
  • a general support means of low friction for example, an arc-shaped guide designed to support the filament 23 over a filament contact angle v 30 but relying in low friction against the filament 23 whilst still providing sufficient pressure against pinch wheel 10.
  • Such low friction could for example be achieved by a PTFE coat or highly polished surface on a steel guide.
  • the support rollers 9 or support means may be spring loaded to provide a controlled pressure against pinch wheel 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Robotics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
PCT/IB2014/062163 2014-06-12 2014-06-12 Extruder for fused filament fabrication 3d printer Ceased WO2015189661A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/IB2014/062163 WO2015189661A1 (en) 2014-06-12 2014-06-12 Extruder for fused filament fabrication 3d printer
JP2017517435A JP6643553B2 (ja) 2014-06-12 2014-06-12 溶解フィラメント製造方式３ｄプリンターの押出機
CN201480080359.2A CN106660267B (zh) 2014-06-12 2014-06-12 用于熔融丝材制造3d打印机的挤出机
US15/372,379 US20170157826A1 (en) 2014-06-12 2016-12-07 Extruder for fused filament fabrication 3d printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2014/062163 WO2015189661A1 (en) 2014-06-12 2014-06-12 Extruder for fused filament fabrication 3d printer

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/372,379 Continuation US20170157826A1 (en) 2014-06-12 2016-12-07 Extruder for fused filament fabrication 3d printer

Publications (1)

Publication Number Publication Date
WO2015189661A1 true WO2015189661A1 (en) 2015-12-17

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PCT/IB2014/062163 Ceased WO2015189661A1 (en) 2014-06-12 2014-06-12 Extruder for fused filament fabrication 3d printer

Country Status (4)

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US (1) US20170157826A1 (enExample)
JP (1) JP6643553B2 (enExample)
CN (1) CN106660267B (enExample)
WO (1) WO2015189661A1 (enExample)

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JP2018086814A (ja) * 2016-11-29 2018-06-07 キョーラク株式会社 ３ｄプリンタ及び３次元造形方法
CN108284591A (zh) * 2016-11-11 2018-07-17 罗天珍 Fdm3d打印机专用螺纹推进式挤出机
CN108454092A (zh) * 2018-03-09 2018-08-28 陕西理工大学 自动调节夹紧力与送丝装置
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CN113001982B (zh) * 2021-03-17 2022-12-16 深圳市创想三维科技股份有限公司 一种挤出装置及3d打印机
CN113232288B (zh) * 2021-05-08 2023-11-07 浙江师范大学 一种具有连续均匀进料功能的挤出式3d打印机装置
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CN114770935B (zh) * 2022-03-05 2023-04-21 南通理工学院 一种用于3d成型的塑料挤出装置
CN116080075B (zh) * 2022-10-28 2024-02-27 南京航空航天大学 一种适用于柔性丝材熔融沉积增材制造的进丝机构
CN115891140B (zh) * 2022-12-07 2025-10-28 武汉理工大学 用于丝材成型的增材制造装置及增材制造方法
US12403653B2 (en) 2023-04-21 2025-09-02 Dyze Design Extruder head assembly for additive manufacturing machines
CN116690991A (zh) * 2023-05-20 2023-09-05 南京航空航天大学 一种实时动态调控3d打印挤出流量方法

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