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EP4140609B1 - Procédé d'extrusion et machine rotative d'extrusion - Google Patents

Procédé d'extrusion et machine rotative d'extrusion Download PDF

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Publication number
EP4140609B1
EP4140609B1 EP22186181.8A EP22186181A EP4140609B1 EP 4140609 B1 EP4140609 B1 EP 4140609B1 EP 22186181 A EP22186181 A EP 22186181A EP 4140609 B1 EP4140609 B1 EP 4140609B1
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European Patent Office
Prior art keywords
die
channel
extrusion
cross
sectional area
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EP22186181.8A
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German (de)
English (en)
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EP4140609A1 (fr
EP4140609C0 (fr
Inventor
Dr. Hendrik Busch
Dr. Olaf Schwedler
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Kme Mansfeld GmbH
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Kme Mansfeld GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/005—Continuous extrusion starting from solid state material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, rods or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating extruded work or parts of the extrusion press
    • B21C29/003—Cooling or heating of work

Definitions

  • the invention relates to an extrusion method with the features of the patent claim and to a rotary extrusion machine according to patent claim 6.
  • the WO 2018/134018 A1 discloses a continuous extrusion process for a metal-containing bulk material for producing an extruded body.
  • the metal-containing bulk material is introduced into a press channel of a metal powder extrusion plant.
  • the press channel is delimited by a rotating extrusion wheel and press tool components.
  • the press tool components comprise an inlet area with sealing plates and a deflection area with a counterholder and a feed plate.
  • the metal-containing bulk material is fed to the counterholder via a circumferential groove of the rotating extrusion wheel and by deflecting the compacted metal-containing bulk material in the deflection area through an opening in a feed plate of a die.
  • At least one of the sealing plates arranged in the inlet area is cooled by means of a cooling device.
  • Continuous rotary extrusion or radial extrusion is a special form of conventional extrusion for the continuous extrusion of simple or geometrically complex end or semi-finished products, especially from cast copper wire.
  • the end or semi-finished products extruded using continuous rotary extrusion can in particular be busbars made of pure copper material (Cu-OFE) with a copper content of 99.99 wt.%. These busbars are increasingly being used as solid flat conductors for high-voltage applications in electric vehicles.
  • Cu-OFE is characterized by the combination of a very high electrical conductivity ⁇ 58.6 MS/m and good weldability.
  • extruded flat conductors have an inhomogeneous structure with coarse grains throughout the entire extrusion cross-section.
  • This structure composition can have a negative effect on the properties of end products, particularly in sharp-edged bending applications.
  • Sharp-edged bending applications are those with a bending angle greater than 90°.
  • the inhomogeneous structure of the extruded flat conductors leads to an undesirable surface defect (orange peel effect) and even surface cracks and complete failure.
  • the invention is therefore based on the object of demonstrating an extrusion process which improves the surface topography of the extruded products, in particular with regard to the undesirable orange peel effects when bending the extruded products with sharp edges.
  • the invention is achieved by an extrusion process with the features of claim 1.
  • the rotary extrusion machine in particular for carrying out the process, is the subject of claim 6.
  • the extrusion process according to the invention is based on the supply of a copper material in the form of a wire, a powder or a granulate to a friction wheel of a rotary extrusion press.
  • Rotary extrusion presses or rotary extrusion systems work continuously and more cost-effectively than conventional extrusion systems.
  • the supplied copper material is heated by the energy introduced by means of friction and shear until it becomes plastic.
  • the plastic copper material is directed away from the friction wheel and into a retention channel in a retention plate.
  • the shaping die is located downstream of the retention plate.
  • the exit cross-section of the retention channel immediately before entering the die is larger than a shaping extrusion channel in the die. This creates a dead zone for the plastic copper material before entering the die.
  • the dead zone serves to build up the pressure required for the extrusion process so that the extrusion channel is evenly filled with the copper material.
  • the temperature of the plastic copper material in the dead zone and in the die is controlled by reducing the volume of the dead zone to a target value of no more than 550°C. Since the copper material does not reach higher temperatures in any other area, the entire forming process takes place at temperatures up to a maximum of 550°C.
  • Rotary extrusion makes it very difficult to record the temperatures of the copper material in the dead zone and in the area of the die. Due to the complex conditions, knowledge of the local temperature conditions in the radial extrusion process cannot be calculated precisely. Temperatures can only be recorded using an in-situ measurement. In the context of the invention, this was achieved using thermal drag elements. With knowledge of the measured values, mathematical models were adapted so that the temperature curve can be determined with a very good approximation. It has been found that the time-temperature curve during radial extrusion initially involves a steady increase in the temperature of the copper material from room temperature to a very rapid passage through two characteristic temperature maxima. These two temperature peaks represent the material shear and the forming in the die.
  • the measurements have shown that by reducing the volume of the dead zone, a reduction in the forming temperature can be achieved by approx. 50°C to a maximum value of 550°C.
  • the reduction of the dead zone surprisingly has an influence on the microstructure of the fully recrystallized microstructure in the extruded profile.
  • Investigations have shown that, at a comparable extrusion speed, the forming temperature of 50°C to a maximum of 550°C can be used specifically for grain refinement in the order of about 20 ⁇ m. This means that the mean weighted average of the grains of the crystal structure has been reduced by about 20 ⁇ m, so that the structure has a mean weighted grain diameter in a range of 45 ⁇ m to 65 ⁇ m.
  • the increase in ductility in combination with a more homogeneous microstructure distribution improves the surface topology when solid flat conductors are subjected to deformation-intensive bending stresses.
  • the extrusion process according to the invention significantly reduces or even eliminates undesirable orange peel effects.
  • the newly developed extrusion process or the tool concept used to improve the process is suitable for reducing wear and thus also for increasing the economic efficiency of the operation of the continuous rotary extrusion plant.
  • the extrusion process is carried out with a retaining channel that expands exclusively in a funnel shape in the area of the dead zone.
  • the term "expands exclusively in a funnel shape” means that there should be no area towards the end of the retaining channel where the cross-section of the dead zone or retaining channel no longer expands. It has proven to be particularly advantageous if the dead zone expands continuously in a funnel shape. The expansion of the funnel-shaped area therefore takes place in the flow direction of the copper material from each cross-sectional level to the next cross-sectional level of the retaining channel.
  • the inhibition of grain growth is achieved by using a stagnation channel that has an exit cross-sectional area that is not too large compared to the entry cross-sectional area of the extrusion channel and is 40% to max. 60% larger than the entry cross-sectional area of the extrusion channel. If the difference is greater than 40-60%, for example 100%, a large dead zone forms in which the flow rate of the copper material can drop to zero. At the same time, the large difference in diameter between the exit cross-sectional area and the entry cross-sectional area leads to a characteristic temperature maximum that can be avoided by the invention. If the exit cross-sectional area is only 40-60% larger than the inlet cross-sectional area, a target value of no more than 550°C can be achieved in this dead zone and thus also in the transition to the extrusion channel.
  • a retention channel is used in which the funnel-shaped widening area, which can also be referred to as the retention funnel, is not too long, i.e. it does not begin at too great a distance from the die.
  • the retention funnel has an inlet cross-sectional area at a distance from the die, whereby the distance is max. 30% larger than the smallest diameter of the extrusion channel in the inlet cross-sectional area of the extrusion channel.
  • the extrusion channel has an essentially rectangular shape when producing extruded flat conductors. The distance of the inlet cross-sectional plane of the retention funnel is based on the smallest diameter of the extrusion channel, i.e. for example on the thickness of the flat conductor and not on its width.
  • the funnel-shaped widening hopper is not entirely truncated cone-shaped, but rather widens from a square or round inlet cross-sectional area to the outlet cross-sectional area, which is 40-60% larger than the inlet cross-sectional area and max. 30% away from the start of the hopper.
  • the hopper should be proportionally slightly larger than the extrusion channel at its end in all peripheral areas of the extrusion channel in order to ensure a uniform flow of material into the extrusion channel and also to achieve a uniform temperature distribution within the hopper and within the extrusion channel.
  • Proportionally larger means that the outlet cross-sectional area is, for example, rectangular with the proportions of the flat conductor or the extrusion channel.
  • the extrusion process is particularly suitable for the radial extrusion of pure copper.
  • This refers to a high-purity and oxygen-free copper with a copper content of at least 99.99 percent by weight, in particular Cu-OFE copper.
  • This is a non-deoxidized and oxygen-free copper that does not contain any elements that can be vaporized in a vacuum and has a very high conductivity for electricity and heat.
  • the permissible alloying components are 0.0025% Ag, 0.0015 S, 0.0010 Ni, 0.0010 Fe, 0.0003 P, up to 0.0005 As, 0.00020 Bi, 0.0001 Cd, 0.0005 Mn, 0.0005 Pb, 0.0004 Sb, 0.00020 Se, 0.0002 Sn, 0.00020 Te, and 0.0001Zn (all values in mass percent).
  • the Oxygen content is adjusted so that the material meets the hydrogen resistance requirement according to DIN EN 1976.
  • the material designations are in Europe according to EN Cu-OFE, CW009A, in the USA (ASTM(UNS)) C10100 and in Japan (JIS)C1011.
  • the extruded profile is cooled immediately after leaving the die to prevent grain growth outside the die. This maintains the grain refinement effect and increases the ductility of the final product.
  • a rotary extrusion machine comprises a friction wheel for heating a copper material fed in the form of a wire, a powder or a granulate.
  • the rotary extrusion machine for continuous radial extrusion comprises a baffle plate into which the plastic copper material is diverted radially. Even before entering the baffle plate, the temperature of the copper material is increased to values of up to approx. 500°C. After the copper material is diverted into the baffle channel, the temperature drops, only to rise again to a maximum value as it continues along the baffle channel until immediately before entering the shaping die.
  • the accumulation channel has an exit cross-sectional area that is 40-60% larger than the entry cross-sectional area of the extrusion channel.
  • the size of the dead zone is deliberately limited so that the compressed, plasticized material does not reach temperatures that are too high in this area.
  • the pressure required to fill the extrusion channel is built up, but without passing through the temperature ranges that are unfavorable for grain refinement in the edge area.
  • the storage channel is only widened in a funnel shape in the area of the dead zone. In particular, it is continuously widened in a funnel shape and has no jumps in diameter, areas with stagnant diameters or other gradations. Preferably, the expansion of the storage channel is continuous and uniform from the beginning of the storage funnel to the end of the storage funnel.
  • the accumulation channel which has a funnel-shaped accumulation funnel that widens towards the die, should not be too long. The distance between its inlet cross-sectional area and the die should be a maximum of 30% larger than the smallest diameter of the extrusion channel in the inlet cross-sectional area of the extrusion channel.
  • flat conductors can be produced, wherein the structure has an average grain diameter in a range of 45-65 ⁇ m.
  • Such a flat conductor preferably has a tensile strength of 210-220 MPa with a yield strength of over 70 MPa, in particular in the range of 70-80 MPa.
  • the extrusion speeds in the extrusion process according to the invention or in the rotary extrusion machine are preferably in a range of 6-10 revolutions/min.
  • the design of the accumulation funnel or accumulation channel and the resulting dead zone have a significant influence on the microstructure.
  • the surface topography for crack-free and deformation-intensive bending stress can be significantly improved with the correctly designed accumulation funnel.
  • the Figures 1 and 2 show a schematic representation of a rotary extrusion machine 1, to which a copper wire 2 is fed in order to produce a flat conductor 3 with a rectangular cross-section in the west by radial extrusion.
  • the copper wire 2 is gripped by a gripping zone 5 ( Figure 3 ).
  • the copper wire 2 is transformed from a round cross-section into a partially flattened cross-section.
  • the temperature of the copper material increases slowly until the copper material reaches a compression zone 6 following the gripping zone, where it softens and becomes plastic.
  • the compression zone 6 opens into a radially branching damming channel 7 in a damming plate 8.
  • the plasticized copper material is fed directly from the damming channel 7, which widens in the direction of flow, to a die 9.
  • the area relevant for the invention is in Figure 2 and concerns the design of the tool set arranged there, consisting of baffle plate 8 and die 9.
  • the Figures 4 and 5 show a horizontal and a vertical cutting plane through one and the same baffle plate 8 and the die 9 that follows it.
  • the die 9 In the die 9 there is an extrusion channel 10 that is slightly widened in a funnel shape up to a central narrow point at its start and end area.
  • the die 9 has an inlet cross-section 11 that directly borders the outlet cross-section 12 of the baffle channel 7.
  • the two cross-sections coincide in one plane.
  • the damming of the copper material is necessary to ensure that the extrusion channel 10 in the die 9 is evenly filled.
  • the baffle channel 7 has an initial cross-section that can be square with rounded corners, for example.
  • a funnel-shaped widening area which is referred to as the baffle funnel 13.
  • This funnel-shaped widening area opens into an end area with an essentially constant cross-section shortly before the exit cross-sectional area 12.
  • This area with a substantially constant cross-section forms a dead zone 14, which is filled by the plastic copper material.
  • the copper material accumulates there and is then fed into the Extrusion channel 10 of the die 9.
  • the depth R1 indicates the depth of the accumulation funnel 13, measured from the edge area of the extrusion channel 10.
  • the depth R2 according to Figure 5 is to be understood in the same way. Due to the different dimensions in the longitudinal and transverse direction of the extrusion channel 10, the depth R2 is proportionally smaller than the depth R1 in the first cutting plane according to Figure 4 .
  • Figures 6 and 7 show an extrusion channel 7, which has a much smaller dead zone 14 in the hopper 13 in terms of volume.
  • the hopper 13 is also shorter overall.
  • Figure 7 shows the distance A1 between an inlet cross-sectional area 15 of the hopper 13 and the die 9.
  • the said distance A1 is max. 30 % larger than the smallest diameter D1 in the inlet cross-sectional area 11 of the extrusion channel 10, as can be seen from the Figure 7 can be recognized.
  • the Figures 8 and 9 illustrate the differences in the flow rates of the copper material, once in the state of the art and once in the embodiment according to the invention, each related to a quadrant of the extruded profile. It can be seen that in the larger dead zone 14 according to Figure 8 the flow rate is very low due to the dark color and drops to zero.
  • the smaller dead zone 14 according to the embodiment of the invention ( Figure 9 ) also shows a reduction in flow velocity, but only a smaller proportion of the material has to be diverted from the low speeds and accelerated in order to enter the extrusion channel 10, where the flow velocity is about 70 mm/s. The energy input into the dead zone is lower.
  • the Figures 10 and 11 show in the same comparison as the Figures 8 and 9 the temperature distribution in an embodiment of the prior art ( Figures 4 and 5 ) and in the inventive solution ( Figures 6 and 7 ), each based on a quarter strand of the extrusion profile. It is particularly striking that the Figure 10 a temperature range T1 that extends from the dead zone 14 into the extrusion channel 10.
  • the copper material flowing from left to right is heated to temperatures of over 600°C in the edge area. This leads to structural changes and undesirable grain growth. Bending a flat conductor over its high edge leads to the undesirable orange peel effect in the surface or even to microcracks.
  • the inventive solution shows a completely different temperature profile in the area of the dead zone 14. It can be seen that the temperature range T2, which corresponds to a temperature window of 484-542°C, is not only present in the core of the extruded profile, but in the area of the entire dead zone 14 and also in the area of the entire edge area of the material in the extrusion channel 10. The result is a more uniform grain growth. The material properties are thereby significantly improved.
  • the Figure 12 shows a comparison of the achievable tensile strength and yield strength for the conventional design ( Figures 4, 5 ) and for the modified design according to the invention ( Figures 6, 7 ). Each individual column pair refers to different speeds of the friction wheel 4. The speed levels are 6, 8 or 10 revolutions per minute.
  • the tensile strength Rm is in a range of 210-220 MPa and tends to be somewhat higher than with the conventional design of the tool set.
  • the difference is more significant with regard to the yield strength RP02, which is above 70 MPa in the variant according to the invention (6-mod, 8-mod, 10-mod) and is approximately 20 MPa higher than the design in the state of the art (6-, 8-, 10-conv).
  • the Figure 13 shows a micrograph through a quadrant of a flat conductor produced using the method according to the invention.
  • the micrograph for the conventional manufacturing method is in the image plane on the left.
  • the micrograph for the variant according to the invention is in the image plane on the bottom right.
  • the values indicated in the circles are local measured values in the respective zone of the flat conductor.
  • the upper values refer to the image plane on the left.
  • the lower values refer to the image plane on the right. It is clear that the structure is significantly finer and more homogeneous and that the average weighted grain diameter is in a range of 45-65 ⁇ m in contrast to 70-77 ⁇ m in the prior art.
  • the Figures 14 and 15 show in comparison the final result on the radial outer surface of a flat conductor bent by 180°.
  • the Figure 14 shows the state of the art and the clearly visible orange peel effect in the surface.
  • Figure 15 shows the noticeably more uniform surface topology of the flat conductor aimed at according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)

Claims (6)

  1. Procédé d'extrusion présentant les étapes suivantes :
    a) un matériau à base de cuivre alimenté en permanence sous la forme d'un fil (2), d'une poudre ou d'un granulat est chauffé par une roue de friction (4) d'une machine rotative d'extrusion (1) ;
    b) le matériau à base de cuivre, rendu plastique par le chauffage, est acheminé par un canal de retenue (7) s'élargissant en section transversale, aménagé dans une plaque de retenue (8), jusqu'à une matrice (9) de formage logée en aval, dans lequel la section transversale de sortie (12) du canal de retenue (7) immédiatement avant l'entrée dans la matrice (9) est supérieure à celle d'un canal d'extrusion (10) de formage dans la matrice (9), pour la réalisation d'une zone morte (14) pour la montée en pression du matériau à base de cuivre plastique avant l'entrée dans la matrice (9) ; caractérisé par l'étape suivante :
    c) la température du matériau à base de cuivre plastique dans la zone morte (14) et dans la matrice (9) est réglée par réduction du volume de la zone morte (14), à une valeur cible de 550 °C au maximum, dans lequel un canal de retenue (7) est utilisé, lequel s'élargit dans la zone de la zone morte (14) exclusivement en forme d'entonnoir, et possède une aire de section de sortie (12) qui est supérieure de 40 à 60 % à une aire de section d'entrée (11) du canal d'extrusion (10) dans la matrice (9), dans lequel le canal de retenue (7) présente un entonnoir de retenue (13) s'élargissant vers la matrice (9) en une forme d'entonnoir ayant une aire de section d'entrée (15) à une distance (A1) par rapport à la matrice (9), dans lequel la distance (A1) est supérieure de 30 % au maximum au diamètre (D1) le plus petit du canal d'extrusion (10) dans l'aire de section d'entrée (11) du canal d'extrusion (10).
  2. Procédé d'extrusion selon la revendication 1, caractérisé en ce qu'un cuivre exempt d'oxygène et de grande pureté avec une teneur en cuivre d'au moins 99,99 % en poids est utilisé comme matériau à base de cuivre.
  3. Procédé d'extrusion selon la revendication 1 ou 2, caractérisé en ce que le profilé extrudé est immédiatement refroidi après la sortie de la matrice (9).
  4. Procédé d'extrusion selon l'une quelconque des revendications 1 à 3 pour la fabrication de conducteurs plats extrudés.
  5. Procédé d'extrusion selon l'une quelconque des revendications 1 à 4, en utilisant une machine rotative d'extrusion (1) selon les caractéristiques de la revendication 6.
  6. Machine rotative d'extrusion (1) présentant
    a) une roue de friction (4) pour le chauffage d'un matériau à base de cuivre alimenté sous la forme d'un fil (2), d'une poudre ou d'un granulat et
    b) une plaque de retenue (8) avec un canal de retenue (7) afin de retenir le matériau à base de cuivre rendu plastique chauffé par friction avant une matrice (9) de formage logée en aval avant que le matériau à base de cuivre plastique entre dans un canal d'extrusion (10) de la matrice (9), caractérisé en ce que
    c) le canal de retenue (7) possède pour la formation d'une zone morte (14) une aire de section de sortie (12) qui est supérieure de 40 à 60 % à une aire de section d'entrée (11) du canal d'extrusion (1),
    d) dans lequel le canal de retenue (7) est élargi dans la zone de la zone morte (14) exclusivement en forme d'entonnoir,
    e) dans lequel le canal de retenue (7) présente un entonnoir de retenue (13) s'élargissant vers la matrice (9) en forme d'entonnoir avec une aire de section d'entrée (15) à une distance (A1) par rapport à la matrice (9), dans lequel la distance (A1) étant supérieure de 30 % au maximum au diamètre (D1) le plus petit du canal d'extrusion (10) dans l'aire de section d'entrée (11) du canal d'extrusion (10).
EP22186181.8A 2021-08-05 2022-07-21 Procédé d'extrusion et machine rotative d'extrusion Active EP4140609B1 (fr)

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DE102021120427.5A DE102021120427B4 (de) 2021-08-05 2021-08-05 Strangpressverfahren, Rotationsstrangpressmaschine und Flachleiter

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EP4140609A1 EP4140609A1 (fr) 2023-03-01
EP4140609B1 true EP4140609B1 (fr) 2025-01-29
EP4140609C0 EP4140609C0 (fr) 2025-01-29

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CN117334383A (zh) * 2023-10-19 2024-01-02 宁波金田电磁科技有限公司 一种绝缘电线及其制备方法、生产设备
CN117497248A (zh) * 2024-01-02 2024-02-02 尚纬股份有限公司 一种实心分割铝导体高压电缆制备方法

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JPS6027417A (ja) * 1983-07-25 1985-02-12 Sumitomo Heavy Ind Ltd 回転ホイ−ル式連続金属押出装置
GB8602985D0 (en) * 1986-02-06 1986-03-12 Alform Alloys Ltd Extrusion apparatus
GB8915769D0 (en) * 1989-07-10 1989-08-31 Bwe Ltd Continuous extrusion apparatus
JP3317230B2 (ja) * 1998-02-03 2002-08-26 日立電線株式会社 回転ホイール式連続押出機
WO2000010750A1 (fr) 1998-08-19 2000-03-02 Ums Schweizerische Metallwerke Ag Profile creux electro-conducteur
JP2002143921A (ja) * 2000-11-09 2002-05-21 Hitachi Cable Ltd 銅材の連続押出し方法
JP3661641B2 (ja) * 2001-12-25 2005-06-15 日立電線株式会社 整流子片用異形銅条の製造方法
CN100409958C (zh) * 2006-09-29 2008-08-13 大连康丰科技有限公司 一种组合式连续挤压机的腔体
CN100431729C (zh) * 2006-09-29 2008-11-12 大连康丰科技有限公司 一种扩展挤压的连续挤压方法及装置
DE102017100911A1 (de) 2017-01-18 2018-07-19 Neue Materialien Fürth GmbH Kontinuierliches Strangpressverfahren für ein metallhaltigesSchüttgut und Metallpulverstrangpressanlage
JP2018186175A (ja) * 2017-04-25 2018-11-22 住友電気工業株式会社 コイル用巻線

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EP4140609A1 (fr) 2023-03-01
DE102021120427A1 (de) 2023-02-09
EP4140609C0 (fr) 2025-01-29

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