EP3774123A1 - Procédé de fabrication d'un corps spiralé - Google Patents

Procédé de fabrication d'un corps spiralé

Info

Publication number
EP3774123A1
EP3774123A1 EP19717481.6A EP19717481A EP3774123A1 EP 3774123 A1 EP3774123 A1 EP 3774123A1 EP 19717481 A EP19717481 A EP 19717481A EP 3774123 A1 EP3774123 A1 EP 3774123A1
Authority
EP
European Patent Office
Prior art keywords
powder
core
powder layer
coiled
layer
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
EP19717481.6A
Other languages
German (de)
English (en)
Inventor
Matthias Busse
Franz-Josef Wöstmann
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP3774123A1 publication Critical patent/EP3774123A1/fr
Pending legal-status Critical Current

Links

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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • 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
    • B22F3/1017—Multiple heating or additional steps
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/004—Article comprising helical form elements
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F2005/103—Cavity made by removal of insert
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • 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
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • B22F3/1021—Removal of binder or filler
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0425—Copper-based alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0466—Alloys based on noble metals

Definitions

  • the invention is in the field of mechanical engineering and more specifically in the field of foundry technology. It relates to a method for producing a coiled body, for example a coil or a spring. Under such a body is in particular a strand-shaped body was ver, which is curved so that it runs in the form of a helix.
  • a coiled body for example a coil or a spring.
  • a strand-shaped body was ver, which is curved so that it runs in the form of a helix.
  • Such helical bodies may, for example, be used as electric coils and are particularly advantageous for some purposes when the coiled body itself is hollow. In this case, the coil can be traversed by a current of high current and cooled from the inside by a liquid flowing through the cavity.
  • other applications for such hollow coiled bodies are also conceivable.
  • the present invention is therefore based on the background of the prior art, the object to provide a method for producing a hollow coiled, electrically conductive body, which is carried out by simple means and allows a cost-effective production of such body.
  • the object is achieved according to the invention by a method with the Merkma len of claim 1.
  • the claims 2 to 11 relate to possible embodiments of such a method.
  • the invention relates to a method of manufacturing a hollow, coiled, electrically conductive body. Furthermore, the invention relates to the corresponding coiled body according to claim 13. Possible embodiments of the coiled body are described in claims 14 to 17.
  • a coiled core made of a heat liquefiable or vaporizable core material and then by means of a Pulverveiquessver procedure with a first powder layer of an at least partially electrically conductive first powder is coated and that thereon the coiled core with the first powder layer is heated to a first temperature at which the core liquefied or gaseous form and the first powder layer is at least partially solidified in porous form, wherein the core material emerges from the space surrounded by the powder coating and wherein after the exit of the core material from that of the first powder layer surrounding space, the first powder layer is further sintered, in particular in that the first powder layer is heated to a second temperature which is higher than the first temperature.
  • the method is such that initially a coiled core, for example of a foamed plastic, in particular of an EPS plastic (expanded polystyrene), is produced.
  • a coiled core for example of a foamed plastic, in particular of an EPS plastic (expanded polystyrene)
  • EPS plastic expanded polystyrene
  • This body thus created defines the geometry of the resulting coiled body.
  • This acting as a model core can alternatively be made of a foam material from a waxy, easily meltable material.
  • the core can be connected to one or more connection fittings, which are further treated with the core below.
  • the core thus created is then coated with an electrically conductive first powder, for example a metal powder.
  • This coating step can be realized in a known powder coating method.
  • the powder used is a sinterable powder which can be sintered by providing appropriate physical conditions, in particular heating to a necessary sintering temperature.
  • the powder layer is thus hardened while adhering to the core.
  • the core material is melted or evaporated and can escape. It is particularly advantageous if the powder is sintered only so far that the resulting solid remains porous, so that the material of the core can at least partially escape through the pores of the sintered powder layer.
  • material for the first layer it is possible to use all sinterable materials, in particular sinterable metallic powders.
  • the powder layer can be further sintered, for example, by heating to a relation to the first Tempe temperature increased second temperature.
  • other physical parameters may be changed, such as the pressure to favor further sintering.
  • the first powder can be so far sintered that it is sufficiently solidified, in particular so far that the pores are closed.
  • the temperatures can be be selected according to the sintering temperatures typical for the materials used.
  • connection fittings if present, can be coated together with the core and in this way become part of the coiled body.
  • a coiled body which takes substantially the shape of the coiled core.
  • the later coiled electrically conductive body has a cavity in its interior, which corresponds exactly to the shape of the coiled core initially therein.
  • the powder layer is self-supporting, so that a stable coiled elec trically conductive body is formed from the powder layer.
  • the coiled core defining the cavity and the powder layer may be formed in the process such that the cavity in the coiled body to be formed forms a fluid channel which, for example, at one or more predefined locations, particularly at least at one end of the coiled Body, having one or more openings.
  • the powder layer may each have an interruption at the one or more predefined locations, so that the core is exposed there.
  • the interruption can be introduced, for example, each by no powder is applied to the appropriate location (such as by covering the location and subsequent removal of the cover), or by previously removed powder is removed in a post-processing step, such as by cutting a portion of the core.
  • the geometry of the core can be chosen so that the spaces between the individual spirals of the created electrically conduct the body are minimized and thus an optimized space filling / space utilization is achieved with the coiled electrically conductive body, for example, with a space filling above 95%.
  • the sintering can be controlled in such a way that the first powder layer is sintered at the first temperature, by which the first powder layer is solidified, but remains so porous that the liquefiable or vaporizable core material can escape through the sintered powder layer ,
  • the first powder layer is formed in the form of a plurality of successively applied partial layers of the first powder.
  • the thickness of the powder layer can be controlled well, and in particular partial layers can be applied successively in this way, which can be dried or partially solidified, in particular also partially sintered, at least stepwise before application of the next layer.
  • At least one second powder layer of a second powder is applied to the first powder layer.
  • the sintered layer can be made suitable, and the resulting bobbin can be provided with the required line cross-section.
  • all of the powder layers may have the interruptions described above to create openings in the cavity.
  • one or more interruptions may be provided in the powder coating with the first and / or second powder layer to produce one or more openings for the cavity defined by the coiled core that is delimited by the powder coating and then formed in the manufactured one coiled body extends.
  • the second powder consists of an electrically isolie-generating material and forms an insulating layer after sintering.
  • a material for the second powder layer about sinterable ceramic powder or other electrically insulating sinterable powder can be used.
  • the body as a whole can be produced as a functional and insulated coil body / bobbin.
  • the second powder layer as well as the first powder layer is sintered simultaneously with this or after this.
  • another mode of solidification of the second layer such as drying or setting, may be used.
  • the powder coating by the first or a second or further layer can be provided that the powder coating with the first and / or a second powder layer by spraying, dipping or Ver use of a fluidizing powder bed or by several different successive said coating types.
  • the entire surface of the coiled body of the core can be uniformly coated, even if the distance between adjacent turns of the coil is small. In this way, a coiled body can be made with minimal spacing between each helix.
  • the powder coating takes place with powder slip and / or a Pulverfeedstock.
  • powder slurry is thereby understood a mushy mass comprising a powder in a carrier liquid speed with the addition of a viscous binder.
  • powder feedstock Under a powder feedstock a homogeneous mixture of powder and binder is ver, which allows a particularly good dimensional stability during sintering.
  • Suitable sintering methods are all known sintering processes which are expedient for the particular powder used, for example also using a suitable gas atmosphere or inert gas atmosphere.
  • a suitable gas atmosphere or inert gas atmosphere As sintered metal powder or metal alloy powder or mixtures of different metal powder or metal alloy powder can be used in particular.
  • the coiled core is produced in a casting process or a foaming process, wherein the core is in particular composed of several parts to sammenshow.
  • cores in complicated shapes for example in the form of a helical or spiral spring, easy to produce.
  • the foam can be foamed in a mold or produced by extrusion and subsequent shaping.
  • the core is produced as a blank and then brought into the shape of a helix by generating a helical recess.
  • the blank may, for example, cylindrical or cuboidal shape, wherein the blank can have him through, cylindri rule, prismatic or cuboidal cavity, which passes through him completely from a first end to the second end.
  • the blank may thus have the shape of a hollow cylinder.
  • the helical recess is generated by an axis passing through an axis rotating and at the same time steadily advanced along the axis tool.
  • the axis of the core about which the tool rotates can penetrate both the blank and the cavity in its interior, so that the tool at least partially rotates within the cavity and at its radially outer end passes through and removes the material of the blank.
  • the axis about which the tool rotates the longitudinal axis of a Be hollow cylinder, which forms the blank.
  • the tool can then rotate about the axis, which introduces a recess into the wall of the hollow cylinder, for example cuts, mills or saws.
  • the tool can be designed, for example, in the manner of a knife or a saw or a rasp.
  • the tool can also rotate during the machining process about its own longitudinal axis or perform along its longitudinal axis a sawing, oscillating or vibrating movement.
  • the tool can also be heated to melt the material of the blank.
  • the tool In addition to the rotating pivoting movement of the tool, it can be advanced continuously parallel to the longitudinal axis of the blank, so that the tool generates a helical recess in the blank and thus transforms the blank into an at least partially helical body.
  • the helical body has a cavity.
  • the cavity is made as described above with the help of the core and the dimen solutions of the cavity are defined by the dimensions of the core.
  • the helical body has in one embodiment as a cavity a fluid channel with at least one, preferably at least two openings.
  • the openings may, for example, be provided at opposite ends of the helical body. It may alternatively or additionally be provided openings that are not at the ends of the helical body but, for example, laterally to the windings.
  • the fluid channel may have a constant or a ver Sli Chen cross section over its length.
  • the core may be designed for the production of the fluid channel according to by having a constant or variable thickness.
  • the coiled body has external dimensions, which may be in the centimeter to decimeter range, for example.
  • the Be body cylindrical or cuboid so have a round or rectangular base and a height extending in the direction of the cavity and the longitudinal axis.
  • the body may, however, for example, be tapered in the direction of its height, so that it has, for example, a truncated cone or a truncated pyramid shape.
  • the outer dimen- sions can be, for example, between 3 cm and 1 m in each spatial direction, ie the base area can have, for example, a diameter or lateral dimensions (eg side lengths) of between 3 cm and 1 m.
  • the height can for example be between 3 cm and 1 m.
  • the cross section of the fluid channel can be, for example, polygonal or elliptical, in particular rectangular or circular.
  • the dimensions of the cross-section of the fluid channel may alternatively or additionally, for example, in the range of a few millimeters to a few centimeters.
  • Cross sectional area may be approximately between 10 mm 2 and 50 cm 2 .
  • the dimensions-for example, a diameter or a side length of the cross-sectional area of the fluid channel, depending on the geometry thereof- may be at least 5 mm and / or at most 5 cm.
  • a wall thickness of the material surrounding the cavity, which is made of the first powder layer or of the first and the second powder layer, may for example be between 1 mm and 20 mm.
  • FIG. 1 is a perspective view of a helical body / a coil
  • Fig. 2 shows a winding of a coil / a helical body in
  • Cross-section, 3 is a coil of another helical body in cross-section
  • FIG. 5 shows a device for producing a helical core and a core, in which a recess has been partially introduced
  • Figure 1 shows a perspective view of an electrically conductive coil 1 as a helical body, the / by a coiled, insulated, strand-shaped electrical conductor 2 is formed.
  • an electrically conductive coil 1 as a helical body, the / by a coiled, insulated, strand-shaped electrical conductor 2 is formed.
  • Figure 1 is a quadrangular cross-section, in particular square coil Darge presents, wherein the conductor forming the coil, for itself also has a rectangular cross-section.
  • the various helical layers of the conductor are rectangular in shape and superimposed with small distances.
  • the coiled body has external dimensions that correspond to a cuboid, with a rectangular (square) base area a x b and a height h, along which extends in the direction of the cavity.
  • the body may, for example, also have a different base surface and / or be tapered in the direction of its height, so that it has, for example, a truncated cone shape or a truncated pyramidal shape.
  • the outer dimen- sions a, b and h are each between 3 cm and 1 m.
  • Figure 2 shows an example of the cross section of an insulated conductor, which can be used for example for the production of a coil, as shown in Figure 1.
  • the hollow, formed of a sintered powder outer part is denoted by 3, and it is within the powder coating 3 nor the core 4 is shown, which consists for example of a foam, in particular EPS.
  • the constellation shown in FIG. tion arises, for example, directly after the coating of the coiled core 4 with a first powder 3.
  • the powder 3 is electrically at least partially conductive and consists of an electrically conductive material, such as a metal or a metal alloy. It may also consist of a mixture of two or more powders, the preference as all are electrically conductive.
  • the coated core 4 can be heated to a temperature below the melting temperature of the first powder, whereby the material of the core 4 either evaporates or liquefies.
  • the material of the core may then escape at one end of the layer / coating or through the coating itself, leaving only the coating that is simultaneously sintered and solidified.
  • the sintering process is usually controlled so that in a first phase of the sintering, when the first powder layer 3 is still permeable to gas or fluid, the core is liquefied or made gaseous and can thus escape, for example, through the coating 3 / powder layer 3.
  • the sintering can be continued further, either by keeping the temperature stable for a further time or by slightly raising the temperature, so that the sintering process continues to progress. This can be continued until a compaction of the first powder layer has taken place, so that it has become gas / fluid impermeable.
  • the sintering process can be carried out, for example, in a protective atmosphere.
  • a cross-sectional area pxq of the rectangular in this example fluid channel is for example between 10 mm 2 and 50 cm 2 .
  • Side lengths p and q of the cross-sectional area of the channel may, in examples, corresponding to the cross-sectional area, be a few millimeters to a few centimeters.
  • a wall thickness w of the material surrounding the cavity, which comprises the first powder layer, may for example be between 1 mm and 20 mm. It may alternatively or additionally also openings of the fluid channel beariage provides that are not at the ends of the helical body but, for example, laterally to the windings.
  • the fluid channel may have a constant or a ver Sli Chen cross section over its length.
  • FIG. 3 shows a constellation with a cross-sectionally round core 4 'which is surrounded by a first powder layer 3' and an outer second powder layer 5.
  • the first powder layer 3 ' consists of an electrically conductive powder, for example a metal powder
  • the second powder layer 5, which surrounds the first powder layer 3' made of an electrically insulating material, such as a sinterable ceramic powder or other sinterable electrically insulating powder, exists or is made.
  • the inner layer 3 ' is electrically conductive and forms the conductor of the coiled body and the outer layer 5 forms an outer insulation for the conductor 3'.
  • the powder layers 3 'and 5 can also be applied one after the other and sintered. Since the powder coating with the usual powder coating method, such as dipping or spraying, requires very little space, even close to each other turns of the coil, as shown in Figure 1, evenly covered with a powder layer, which is then solidified by sintering. Thus, a production of a coiled electrically conductive body with a small footprint and low clearance between the individual turns and optionally with an insulation in a simple manner can be produced. By such a coiled body is under optima ler space use a coil or spring produced.
  • a cross-sectional area of the core 4 in this case round or fluid channel has the radius r, which is for example between 5 mm and 5 cm.
  • the area may alternatively or additionally be, for example, between 10 mm 2 and 50 cm 2 .
  • a wall thickness w 'of the material surrounding the cavity, which comprises the first and the second powder layer, may for example be between 1 mm and 20 mm.
  • FIG. 4 shows an enlarged schematic representation of a first powder layer 3 and a core 4, wherein individual grains of the powder layer can be distinguished.
  • the material of the core is vaporized or liquefied and can pass through the pores of the first powder layer 3 according to the arrows 6, 7, as long as the material of the first powder layer has not yet been sintered to a fluid tightness.
  • FIG. 5 shows a hollow cylinder 8 which serves as a blank for producing the core.
  • This blank 8 may for example be made of a foam, but also of a wax or a similar meltable mass be.
  • the cylinder 8 has a cylindrical cavity 9, so that it is formed in total as a hollow cylinder with a hollow cylinder wall 10.
  • the longitudinal axis of the hollow cylinder is designated by 11.
  • a device for introducing a helical recess in the hollow cylinder 8 which has a vertically arranged shaft 12 which is rotatably mounted on a holder 17 about its longitudinal axis.
  • a tool 13 is arranged, which protrudes perpendicularly from the shaft 12.
  • the tool 13 is connected by means of a vibration or shegeantriebs 14 with the shaft 12.
  • This drive 14 can cause an oscillatory movement of the tool 13 in the direction of the double arrow 15.
  • a heater for the tool 13 may be provided.
  • the tool 13 moves in a circular path about the axis 11 and thereby divides the hollow cylinder 8 when the tool makes its way through the cylinder wall 10. This can be done for example by a rasping or sawing movement, as far as the tool 13 has a toothing. It may also be provided a heating of the tool 13 in order to heat it so far that it melts the material of the hollow cylinder 8. Simultaneously with the rotational movement about the axis 11, an axial feed of the tool 13 in the direction of the axis 11 is provided, for example, with a constant Speed is done. However, the feed rate may also be changed to produce different sections of different pitch.
  • a helical recess 16 is introduced into the hollow cylinder 8.
  • the recess between the individual passages of the continuous recess 16 remaining part of the hollow cylinder 8 also has the shape of a helix.
  • This body can be used as the core for the body
  • a hollow, coiled electrically conductive body used and later covered with a first layer of powder. After sintering the first powder layer and removing the core material, a hollow, coiled electrically conductive body remains in the form of a coil.
  • Fig. 6 shows an end portion of a hollow coiled body 1 in a perspective view.
  • the coiled body may have the shape of a spiral with a diameter decreasing or increasing from turn to turn of the coil, but also the shape of a constant diameter screw.
  • the coiled body 1 has at one or both ends a connection fitting 20, which takes the form of a sleeve, in particular a cylindrical sleeve.
  • the sleeve 20 may be made of a metal, such as iron, steel, stainless steel, copper or brass.
  • the sleeve 20 may have a metallic terminal tab 21 for the produc- tion of an electrically conductive compound.
  • Fig. 7 shows that in the manufacturing process, the core 4 connected to the connection fitting 20 and then both together with a powder layer 3, 3 'are coated. This is indicated by the arrows 22.
  • FIG. 8 shows that in the connection of the core 4 with the fitting 20, the core 4 ends at the fitting and this can be attached to the core.
  • FIG. 9 shows that the core 4 can also extend into a through opening 20a of the fitting.
  • the core 4 can be poured into this during its manufacture on and in the fitting 20.
  • the Fign. 8 and 9 show that the coating 23 is applied to both the core 4 and the sleeve 20, so that the sleeve 20 without further Measures after the removal of the core with the formed by the coating 23 parts of the coiled body 1 is connected. Such a connection may be provided at both ends of the body 1.
  • the sleeve (s) 20 may also have an electrical connection as well
  • a sleeve may also have a screw thread 24 (see Fig. 10) and / or a bayonet lock and / or a seal and / or a seal seat.
  • a hollow coiled body with a small footprint and high space utilization can be created, which can be used very efficiently as an electric coil by the possibility of internal cooling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un corps (1) creux spiralé électriquement conducteur, selon lequel un noyau spiralé (8) est d'abord fabriqué à partir d'un matériau de noyau pouvant être liquéfié ou vaporisé sous l'action de la chaleur puis recouvert d'une première couche de poudre (3, 3') d'une première poudre au moins partiellement électriquement conductrice au moyen d'un procédé d'application de poudre et selon lequel le noyau spiralé pourvu de la première couche de poudre est ensuite chauffé à une première température à laquelle le noyau est liquéfié ou transformé sous forme gazeuse et la première couche de poudre est durcie au moins partiellement sous forme poreuse, le matériau de noyau sortant de l'espace entouré par le revêtement de poudre et la première couche de poudre étant encore frittée après la sortie du matériau de noyau de l'espace entouré de la première couche de poudre, en particulier en chauffant la première couche de poudre à une deuxième température qui est supérieure à la première température. L'invention se rapporte également au corps spiralé.
EP19717481.6A 2018-04-12 2019-04-11 Procédé de fabrication d'un corps spiralé Pending EP3774123A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018205588.2A DE102018205588A1 (de) 2018-04-12 2018-04-12 Verfahren zur Herstellung eines gewendelten Körpers
PCT/EP2019/059356 WO2019197584A1 (fr) 2018-04-12 2019-04-11 Procédé de fabrication d'un corps spiralé

Publications (1)

Publication Number Publication Date
EP3774123A1 true EP3774123A1 (fr) 2021-02-17

Family

ID=66175423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19717481.6A Pending EP3774123A1 (fr) 2018-04-12 2019-04-11 Procédé de fabrication d'un corps spiralé

Country Status (5)

Country Link
US (1) US20210121960A1 (fr)
EP (1) EP3774123A1 (fr)
CN (1) CN112004626B (fr)
DE (1) DE102018205588A1 (fr)
WO (1) WO2019197584A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018205585A1 (de) * 2018-04-12 2019-10-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung eines wendelförmigen Gießmodells

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2695230A (en) * 1949-01-10 1954-11-23 Michigan Powdered Metal Produc Process of making powdered metal article
FR876M (fr) * 1960-10-12 1961-10-16
DE1464128A1 (de) * 1961-06-27 1969-03-27 Westinghouse Electric Corp Langgestreckte Bauelemente und Verfahren zu ihrer Herstellung
DE3336842A1 (de) * 1983-10-11 1985-04-25 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Regelverfahren fuer eine fluessigkeitsgekuehlte kabelanlage
HU193432B (en) * 1984-05-03 1987-10-28 Tungsram Reszvenytarsasag Method for treating spirals wound onto core wire
DE3724156A1 (de) * 1987-07-22 1989-02-02 Norddeutsche Affinerie Verfahren zum herstellen von metallischen oder keramischen hohlkugeln
CN1040851C (zh) * 1992-12-18 1998-11-25 胡小弟 多孔陶瓷成型方法
JPH0974037A (ja) * 1995-09-07 1997-03-18 Matsushita Electric Ind Co Ltd ロータリートランスの製造方法
JP4362009B2 (ja) * 1997-10-13 2009-11-11 ネクサン・スーパーコンダクターズ・ゲー・エム・ベー・ハー 高温超伝導材料からコイルを製造する方法及び低交流損失高温超伝導コイル
DE19929760C2 (de) * 1999-06-29 2003-05-22 Fraunhofer Ges Forschung Verfahren zur Herstellung metallischer, oxydischer oder keramischer Hohlkugeln
ATE430909T1 (de) * 2000-07-14 2009-05-15 Univ Virginia Schaum für wärmetauscher
JP2005294725A (ja) * 2004-04-05 2005-10-20 Murata Mfg Co Ltd 積層型セラミック電子部品及び該積層型セラミック電子部品の製造方法
JP2005310694A (ja) * 2004-04-26 2005-11-04 Murata Mfg Co Ltd 導電性ペースト及び積層セラミック電子部品の製造方法
US7776255B1 (en) * 2007-04-16 2010-08-17 Imaging Systems Technology Hollow shell and method of manufacture
DE102008006690B4 (de) * 2008-01-25 2010-01-07 Glatt Systemtechnik Gmbh Gesinterter Hohlkörper
US8852498B1 (en) * 2011-04-20 2014-10-07 Imaging Systems Technology, Inc. Beryllium microspheres
CN102351542B (zh) * 2011-07-12 2012-12-05 中南大学 一种中空结构金属或陶瓷零部件的制备方法
US9440216B2 (en) * 2012-03-15 2016-09-13 Geosepaa Llc Minimal surface area mass and heat transfer packing
JP2017048439A (ja) * 2015-09-04 2017-03-09 セイコーエプソン株式会社 電機子用コイルの製造方法、電機子の製造方法および電動機械の製造方法
DE102016202657A1 (de) * 2016-02-22 2017-08-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Gießen eines Bauteils komplexer Geometrie mit einer Gießform in Segmentbauweise
US20180009032A1 (en) * 2016-07-08 2018-01-11 General Electric Company Metal objects and methods for making metal objects using disposable molds

Also Published As

Publication number Publication date
CN112004626A (zh) 2020-11-27
US20210121960A1 (en) 2021-04-29
CN112004626B (zh) 2023-12-08
DE102018205588A1 (de) 2019-10-17
WO2019197584A1 (fr) 2019-10-17

Similar Documents

Publication Publication Date Title
DE3340359C2 (fr)
DE2444907B2 (de) Verfahren zur herstellung eines streifenfoermigen elektrischen widerstandes
DE4427282C2 (de) Verfahren zur Herstellung eines koaxialen Hochfrequenz-Kabels
DE2716950A1 (de) Beheizte duese fuer spritzgussmaschinen und verfahren zu deren herstellung
EP0637360B1 (fr) Corps alveolaire electroconducteur, notamment pour les convertisseurs catalytiques de vehicules automobiles
WO2019197584A1 (fr) Procédé de fabrication d'un corps spiralé
EP3777473B1 (fr) Résistance chauffante en céramique, élément de chauffage électrique ainsi qu'appareil pour chauffer un fluid
DE1463870B2 (de) Vorrichtung zur ausbildung einer isolierschicht in statornuten
DE19717235A1 (de) Wärmerohr und Verfahren zur Herstellung desselben
DE2717750A1 (de) Verfahren und vorrichtung zur herstellung von profilen mit hochfrequenzbeheizung
EP3776608B1 (fr) Procédé de fabrication d'un corps électroconducteur spiralé
EP1319453B1 (fr) Dispositif et procédé de remplissage de profilés creux avec une mousse métallique
DE8032997U1 (de) Flexibles rohr
EP3135434B1 (fr) Procede de fabrication d'un outil tridimensionnel evolutif
WO2020169485A1 (fr) Procédé de fabrication d'un corps métallique hélicoïdal
DE60036575T2 (de) Glühkerze und Verfahren zum Herstellung derselben
EP3852953B1 (fr) Procédé et appareil de coulée-laminage destiné à la fabrication d'une structure en spirale
DE2130380A1 (de) Verfahren bzw.Einrichtung zur Herstellung eines zusammengesetzten Supraleiters
AT523427B1 (de) Verfahren zur Herstellung eines Wärmerohres
EP0670209A1 (fr) Dispositif de chauffage, notamment à utiliser dans des moules d'injection pour traiter des matières thermoplastiques
EP0960959A1 (fr) Procédé de production d'un corps composite métallique et corps composite
DE2444907C2 (de) Verfahren zur Herstellung eines streifenförmigen elektrischen Widerstandes
AT200894B (de) Verfahren und Vorrichtung zur Herstellung von mit Kanälen ausgestatteten pulvermetallurgischen Gegenständen
WO2021148080A1 (fr) Procédé de fabrication d'un élément constitutif d'un moteur électrique, élément constitutif d'un moteur électrique et moteur électrique
DE2126984A1 (de) Elektrischer Rohrheizkörper

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20201112

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20220601

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Free format text: PREVIOUS MAIN CLASS: B22F0003100000

Ipc: B22F0005100000

RIC1 Information provided on ipc code assigned before grant

Ipc: C22C 1/04 20060101ALN20240912BHEP

Ipc: B22F 3/10 20060101ALN20240912BHEP

Ipc: B22F 5/00 20060101ALN20240912BHEP

Ipc: B22F 7/06 20060101ALI20240912BHEP

Ipc: B22F 5/10 20060101AFI20240912BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED