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EP4598730A1 - Tête d'extrusion pour la fabrication additive d'un corps moulé - Google Patents

Tête d'extrusion pour la fabrication additive d'un corps moulé

Info

Publication number
EP4598730A1
EP4598730A1 EP23789490.2A EP23789490A EP4598730A1 EP 4598730 A1 EP4598730 A1 EP 4598730A1 EP 23789490 A EP23789490 A EP 23789490A EP 4598730 A1 EP4598730 A1 EP 4598730A1
Authority
EP
European Patent Office
Prior art keywords
tubular body
carrier
extrusion
induction coil
guide flange
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.)
Pending
Application number
EP23789490.2A
Other languages
German (de)
English (en)
Inventor
Frank Jakob
Stefan SPOR
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.)
Plasmics GmbH
Original Assignee
Plasmics GmbH
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 Plasmics GmbH filed Critical Plasmics GmbH
Publication of EP4598730A1 publication Critical patent/EP4598730A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/107—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for continuous movement of material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/44—Coil arrangements having more than one coil or coil segment
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0811—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using induction
    • 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
    • B29C64/205—Means for applying layers
    • B29C64/209—Heads; Nozzles

Definitions

  • the invention relates to an extrusion head for the additive manufacturing of a molded body with a tubular body made of a ferromagnetic material which opens into an extrusion nozzle and is held in a carrier on the feed side, forming an extrusion channel, and with at least one induction coil enclosing the tubular body between the carrier and the extrusion nozzle.
  • the inductively heated tubular body can thus give off its heat to the thermoplastic material, which can be advantageously melted during its conveyance through the extrusion channel in a manner determined with regard to the temperature profile in order to be discharged as a melt strand from the extrusion nozzle closing the extrusion channel.
  • the ferromagnetic tubular bodies can have radially protruding spacer rings on both end faces (WO 2016/102 669 A1).
  • the magnetic field induced in the tubular body forms a stray field in the area of the support that holds the tubular body, which impairs the heating performance of the induction coil. If the support forms a conventional aluminum or copper-based heat sink through which the thermoplastic material strand is fed to the tubular body, the additional problem arises that the magnetic stray field emerging from the inlet-side end of the tubular body held by the heat sink induces eddy currents in the heat sink, which undesirably heat the heat sink.
  • the invention solves the problem in that the tubular body has a guide flange for the induced magnetic field, which is arranged in the axial direction between the induction coil and the carrier and projects radially outwards.
  • the radially outwardly projecting guide flange results in a branching of the magnetic circuit with the effect that a significant part of the magnetic field lines bundled in the guide flange are diverted from the ferromagnetic tubular body, so that the residual magnetic field in the connection area of the tubular body to the carrier causes a comparatively small stray field, so that the inductive heating of the tubular body is improved.
  • this also means that the eddy currents induced in the metallic heat sink by the stray magnetic field can be reduced to a level that is insignificant for the temperature profile in the heat sink.
  • the section of the pipe body protruding axially over the guide flange towards the support can have a smaller wall thickness than the section of the pipe body enclosed by the induction coil.
  • the associated bundling of the field lines can also be used to guide the magnetic circuit in the area of the extrusion nozzle in order to specify special induction conditions and thus ensure a predetermined temperature profile for the melt strand.
  • Fig. 1 shows an extrusion head according to the invention in a schematic longitudinal section in the area of the induction heating
  • Fig. 2 is a representation corresponding to Fig. 1 of an embodiment variant of an extrusion head according to the invention.
  • thermoplastic material strand which is applied in layers as a melt for the additive manufacture of a molded body, is fed through a conveyor channel 1 of a carrier 2 to an extrusion channel 3 which continues the conveyor channel 1 and opens into an extrusion nozzle 4 in order to be melted along the extrusion channel 3 and discharged from the extrusion nozzle 4 as a melt strand.
  • an inductive heating device which comprises a tubular body 5 made of a ferromagnetic material forming the extrusion channel 3 and at least one induction coil 6 surrounding the tubular body 5 at a radial distance.
  • the carrier 2 receiving the tubular body 5 preferably forms a cooling body based on aluminum or copper, into which the tubular body 5 is screwed, for example.
  • the tubular body 5 has a radially outwardly projecting guide flange 7 for the induced magnetic field in the axial direction between the induction coil 6 and the carrier 2, which guide flange diverts a considerable part of the magnetic field from the tubular body 5, so that the residual field in the area of the section 8 of the tubular body 5 between the guide flange 7 and the carrier 2 causes only a comparatively small stray field, which means that on the one hand the effect of the inductive heating can be improved and on the other hand the eddy currents that are induced in the carrier 2 designed as a metallic heat sink are negligible.
  • the guide flange 7 of the tubular body 5 can advantageously serve as a holder for the preferably ceramic coil carrier 9 in order to achieve a to secure an annular gap 10 between the tubular body 5 and the coil carrier 9 which hinders heat transfer.
  • care must be taken to ensure that the position of the guide flange 7 relative to the induction coil 6 is selected in such a way that the magnetic partial circle caused by the guide flange 7 is formed in a way which is advantageous for the field line course.
  • the tubular body 5 according to Fig. 2 has, in addition to the guide flange 7 which acts as a magnetic shield for the carrier 2, a further guide flange 11 in the axial direction between the induction coil 6 and the extrusion nozzle 4, which also influences the course of the magnetic field lines and can therefore help to adjust the magnetic circuit, in particular with regard to the requirements for the temperature profile of the melt strand in the area of the extrusion nozzle 4.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une tête d'extrusion pour la fabrication additive d'un corps moulé comprenant un corps tubulaire (5) constitué d'un matériau ferromagnétique, qui s'ouvre dans une filière d'extrusion (4), sur le côté alimentation est maintenu un support (2) en son sein, et forme un canal d'extrusion (3), et comprenant également au moins une bobine d'induction (6), qui renferme le corps tubulaire (5) entre le support (2) et la filière d'extrusion (4). Pour pouvoir obtenir des conditions de fusion avantageuses, il est proposé que le corps tubulaire (5) comprenne, pour le champ magnétique induit, une bride de guidage (7), qui est disposée entre la bobine d'induction (6) et le support (2) dans la direction axiale et fait saillie radialement vers l'extérieur.
EP23789490.2A 2022-10-06 2023-10-05 Tête d'extrusion pour la fabrication additive d'un corps moulé Pending EP4598730A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50778/2022A AT526563B1 (de) 2022-10-06 2022-10-06 Extrusionskopf für die additive Fertigung eines Formkörpers
PCT/AT2023/060347 WO2024073789A1 (fr) 2022-10-06 2023-10-05 Tête d'extrusion pour la fabrication additive d'un corps moulé

Publications (1)

Publication Number Publication Date
EP4598730A1 true EP4598730A1 (fr) 2025-08-13

Family

ID=88412221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23789490.2A Pending EP4598730A1 (fr) 2022-10-06 2023-10-05 Tête d'extrusion pour la fabrication additive d'un corps moulé

Country Status (3)

Country Link
EP (1) EP4598730A1 (fr)
AT (1) AT526563B1 (fr)
WO (1) WO2024073789A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2014044B9 (en) * 2014-12-23 2017-03-29 Bond High Performance 3D Tech B V Deposition print head.
NL2015512B1 (en) * 2015-09-28 2017-04-20 Ultimaker Bv Inductive nozzle heating assembly.
NL2017016B1 (en) * 2016-06-21 2018-01-04 Ultimaker Bv Nozzle for a three dimensional printing apparatus
US20200061896A1 (en) * 2018-08-26 2020-02-27 Khan Khac Tran Induction Heated Extrusion Melter

Also Published As

Publication number Publication date
WO2024073789A1 (fr) 2024-04-11
AT526563A1 (de) 2024-04-15
AT526563B1 (de) 2025-05-15

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