EP4100573A1 - Tamis à flux et procédé de fabrication d'un tamis à flux - Google Patents

Tamis à flux et procédé de fabrication d'un tamis à flux

Info

Publication number
EP4100573A1
EP4100573A1 EP20819685.7A EP20819685A EP4100573A1 EP 4100573 A1 EP4100573 A1 EP 4100573A1 EP 20819685 A EP20819685 A EP 20819685A EP 4100573 A1 EP4100573 A1 EP 4100573A1
Authority
EP
European Patent Office
Prior art keywords
flow
grille
channels
shape
equal
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
EP20819685.7A
Other languages
German (de)
English (en)
Inventor
Wolfgang Ruf
Michael Oechsle
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.)
Voith Patent GmbH
Original Assignee
Voith Patent 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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4100573A1 publication Critical patent/EP4100573A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/14—Making holes

Definitions

  • the invention relates to a method for producing a flow grille for a headbox of a paper machine, with at least two flow channels for the passage of a pulp suspension, the flow channels each having a first end and a second end.
  • the invention also relates to a flow grille which is used as a turbulence generator and / or as a pipe grille of a headbox.
  • the document WO20 18/0 19545 A1 describes a method for producing a flow module for a pulp feed of a machine for producing a fibrous web.
  • the flow module comprises several flow channels and is constructed and manufactured in one piece using an additive manufacturing process, for example using the “powder bed fusion” process.
  • a flow grille of a headbox is used to convey a pulp suspension with fillers and fines as well as chemicals such as retention agents.
  • they In order to avoid disruptive deposits on the surfaces of the flow channels, they must be as smooth as possible.
  • the geometry of the flow module must be as precise as possible in order to avoid hydraulic disturbances.
  • the known manufacturing processes require several, partly manual, manufacturing steps and are therefore complex.
  • the surface quality achieved by the flow channels is not sufficient for many applications.
  • efforts to reduce the width of the outlet webs between two flow channels and, on the other hand, maintaining a constant geometry of the flow module with regard to improving the flow quality also reach their limits.
  • the object of the invention is therefore to specify a cost-effective method for producing a flow grille for a headbox of a paper machine, by means of which an improvement in the above-mentioned requirements and properties of the flow grille is achieved, as well as specifying an improved flow grille.
  • the method is characterized by the following steps: a. Providing a block made of electrically conductive material, in particular made of metal; b. Introduction of at least two raw channels by a cutting process, in particular by drilling or milling; c. Processing of the raw channels by an electrochemical manufacturing process that removes material to obtain the shape and geometry of the flow channels;
  • a corrosion-resistant material preferably stainless steel, is used for the block.
  • the design of the block is chosen so that it has a high level of stability and is therefore suitable for conducting and / or absorbing external forces. This can be, for example, expansion forces as a result of the internal operating pressure of the nozzle of a headbox.
  • the block provided is preferably designed as a one-piece, that is to say one-piece, preferably as a cuboid component. This promotes stability and mechanical strength.
  • the introduction of the raw ducts by a machining process can be automated.
  • the accuracy requirements for the geometry for example the diameter of the raw ducts, do not need to be very high, since the exact diameter and / or the exact shape is only produced by the electrochemical process. This can reduce the production time.
  • the combination of these two manufacturing processes enables, on the one hand, cost-effective manufacture using the machining process and, on the other hand, very precise manufacture using the electrochemical process.
  • the desired geometric dimensions, shapes and surface smoothness can thus be achieved with high quality.
  • the method according to the invention also enables a shorter production time.
  • the electrochemical manufacturing process used for the invention is temperature-neutral, which means that there is no temperature stress on the block at the location where the material is removed. This prevents the block from warping.
  • the electrochemical manufacturing process - in contrast to mechanical manufacturing or forming technology - is force-neutral.
  • the electrochemical form removal is chosen in such a way that a high active current density is achieved through the use of an external power source. This is achieved by keeping the forming tool electrode at a small distance from the workpiece.
  • the workpiece from which material is to be removed is polarized as the anode and the shaping tool electrode is polarized negatively.
  • the electrochemical manufacturing process comprises at least one cathodically polarized mandrel as a tool electrode, the shape and geometry of which is preferably essentially at least partially complementary to the shape and geometry of the respective flow channel. It also includes the block that is anodically polarized.
  • the tool electrode comprising at least one cathodically poled mandrel and the anodically poled block are moved relative to one another in a removal step so that the tool electrode comprising at least one mandrel from the first end or from the second end into the respective raw channel of the Block is moved.
  • the block can be firmly clamped and the at least one mandrel is moved into the raw channel.
  • the number of mandrels can be equal to or smaller than the number of raw channels.
  • the at least one mandrel is pulled out of the generated flow channel after each removal step and moved to the next or, in the case of several mandrels, to the next raw channels to produce the flow channels.
  • the hydraulic diameter of the raw ducts is enlarged at least in sections by the material removal through the removal step.
  • the processing step c) according to the invention differs from the electrochemical surface removal process.
  • the shape of the flow cross-section of the raw ducts is changed from a round shape to an angular shape at the second end in processing step c), the angular shape preferably being selected from the following group: square shape, rectangular shape, triangular shape , pentagonal shape, hexagonal shape.
  • the hydraulic diameter that is to say the cross section of the flow channel generated at the second end, is greater than the cross section at the first end of the flow channel.
  • the shape of the cross section is round at the first end of the flow channel generated and changes to the angular shape in a transition area.
  • the at least one mandrel starting on the second side with the larger hydraulic diameter of the flow channel, is moved into the block in the removal step.
  • the shape of the at least one dome comprises the transition region, which extends between the round shape and the angular shape at the second end, and the cylindrical region, which extends between the first end and the transition region.
  • the shape of the at least one dome corresponds at least in sections to the negative shape of the transition area.
  • the flow channel can have three different cross-sectional shapes in the longitudinal direction.
  • the cross section In the area of the first end of the flow channel, the cross section is round. This is followed by a transition area to an angular cross-sectional shape and then an area up to the second end with continuation of the angular cross-sectional shape and with a constant cross-sectional area.
  • the flow channels of the flow grid can be designed to be cylindrical from the first end to the second end.
  • a flow grille is suitable, for example, as a pipe grille in front of a turbulence insert in a headbox.
  • the at least one mandrel can be moved into the block in the removal step, starting on the first side of the flow channel or on the second side of the flow channel.
  • the processing step c) comprises a polishing step, the polishing step being carried out by an electrochemical manufacturing process.
  • the at least one mandrel the voltage and thus the active current density being reduced compared to the removal step, so that only surface removal takes place on the surface to increase the smoothness of the respective flow channel.
  • the method 3.4.3. 1 "Electrochemical surface removal (EC shape removal)" according to DI8590: 2003-09 can be used advantageously.
  • At least 5 raw channels, in particular at least 10 raw channels, can be introduced into the block.
  • the flow channels are separated from one another by a partition and the flow grille is produced in such a way that the wall thickness of the partition at the second end is less than 3mm, in particular less than or equal to 1mm, preferably less than or equal to 0.3mm. A flow quality can thereby be achieved.
  • a surface of the flow channels with an average roughness Ra of after processing step c) of less than or equal to 0.2 ⁇ m, in particular less than or equal to 0.1 ⁇ m, can be produced.
  • the block in step a) can be provided with through bores running perpendicular to the flow channels for fastening a plurality of flow grids to one another and for connection to a headbox.
  • the through holes can run vertically and / or horizontally.
  • the invention also relates to the use of the flow grille produced by the method according to the invention as a turbulence generator or as part of a turbulence generator and / or as a pipe grating or as part of a pipe grating of a headbox of a paper machine.
  • a flow grille in particular for a turbulence generator and / or for a pipe grille of a headbox of a paper machine, which is produced according to the method according to the invention.
  • the flow grille in particular for a turbulence generator and / or for a pipe grille of a headbox of a paper machine, is made up of individual modules, the individual modules each being formed by a flow grille produced by the method according to the invention.
  • the individual modules can be arranged one behind the other or next to one another or one above the other or in combinations thereof, as seen in the passage direction.
  • they can be arranged one behind the other and next to one another or one behind the other and one above the other or one behind the other and next to one another and one above the other.
  • the flow grating is used as a turbulence generator or as a pipe grating, it can extend over the entire width and height of the turbulence generator or pipe grating, seen transversely to the direction of passage.
  • the turbulence generator is made in one piece, that is to say made from a block.
  • the mean roughness Ra of the surface of the flow channels is less than or equal to 0.2 ⁇ m, in particular less than or equal to 0.1 ⁇ m.
  • the flow channels are separated from one another by a partition and the wall thickness of the partition at the second end, i.e. on the outflow side, between at least two adjacent flow channels is less than or equal to 3mm, in particular less than or equal to 1mm, preferably less than or equal to 0.3mm amounts to. This improves the stability of the flow after the flow grid.
  • the flow grid can be provided as a turbulence generator for a headbox. There can be several adjacent Include flow channels which form a row and wherein several rows are arranged one above the other.
  • a separating lamella holder for fastening a separating lamella can be incorporated into the block between at least two lines. This can also be done, for example, by an electrochemical, in this case as a spark-removing, manufacturing process.
  • One possible process is the wire EDM process.
  • the flow channels can be designed as step diffusers which have steps for generating turbulence. Steps are seen in the direction of passage, step-like cross-sectional enlargements at which high shear forces arise in the flow.
  • the flow channels can have a division, seen transversely to the direction of passage, in the range from 15 mm to 40 mm in the horizontal or in the vertical direction.
  • FIG. 1 shows an embodiment of a flow grille according to the invention in a simplified representation
  • Figure la is a side view from the left of the invention
  • FIG. 2 shows an embodiment of a block with raw channels in a simplified illustration
  • FIG. 2a shows a side view from the left of the block in FIG. 1 in a simplified representation
  • FIG. 3 shows a snapshot of the processing step c) of the method according to the invention in a simplified representation
  • FIG. 4 shows a further embodiment of a flow grille according to the invention in a simplified representation
  • FIG. 4a shows a side view from the left of the flow grille in FIG. 4 in a simplified representation
  • FIG. 5 shows a headbox of a paper machine with flow grids according to the invention in a simplified representation
  • FIG. 1 shows an embodiment of a flow grille 1 according to the invention with two flow channels 2 in a simplified representation. It is made from a cuboid block 5 made of stainless steel.
  • the flow channels 2 each have two areas. In the area of the first end 3, the flow cross-section is designed to be cylindrical, which then merges in a transition area up to the second end 4 into an angular shape, in this example into a square shape, as shown in FIG.
  • the flow cross-section at second end 4 is larger than at first end 3. Both flow channels 2 are arranged one above the other.
  • FIG. 2 and FIG. 2a show an embodiment of a block 5 with raw ducts 6 in a simplified representation.
  • the raw ducts 6 are introduced into the cuboid stainless steel block 5 by drilling and thus run cylindrically from the first end 3 to the second end 4.
  • the diameters of the raw ducts are both the same and are constant over the entire length. However, it is also conceivable to design the raw ducts 6 with several sections over the length with different diameters.
  • FIG. 3 shows a snapshot of the processing step c) of the method according to the invention with an electrochemical manufacturing method for the manufacture of a flow grille 1 according to FIG. 1 in a simplified representation.
  • the electrochemical manufacturing process comprises a voltage source 8 and two cathodically polarized mandrels 7 as a tool electrode, the shape and geometry of which is preferably essentially at least partially complementary to the shape and geometry of the respective flow channel 2.
  • the complementary geometry is not exactly the same, since there must be a minimal gap for the electrochemical removal.
  • the two flow channels 2 each have two areas. In the area of the first end 3, the flow cross-section is designed to be cylindrical, which then merges into a square shape in a transition area up to the second end 4.
  • the mandrel 7 also has two parts which are assigned to the two areas.
  • the first mandrel part 7.1 has a very short cylindrical area for producing the cylindrical section.
  • the second mandrel part 7.2 has a shape that is complementary to the transition area.
  • the block 5 is anodically polarized.
  • the cathodically polarized mandrels 7 and the anodically polarized block 5 are in one Removal step moved relative to each other.
  • the mandrels 7 are moved into the raw channels 6 in the direction of movement 11, starting from the second end 4 in the direction of the first end 3.
  • material is removed from the block 5 and the geometry of the flow channels 2 is generated in the process.
  • the number of mandrels 7 in this case is equal to the number of raw channels.
  • the hydraulic diameters of the raw channels 6 are enlarged by the material removal, at least in sections, through the removal step.
  • FIGS. 4 and 4a show a further embodiment of a flow grille 1 according to the invention in a simplified representation.
  • the flow grille 1 differs from the flow grille 1 in FIG. 1 and FIG. 1 a only by a larger number of flow channels 2 and a separating lamella holder 23 which is incorporated between two rows of flow channels.
  • the separating lamella holder 23 can, for example, also be incorporated by an electrochemical manufacturing process.
  • One possible method is the wire EDM method.
  • selected partition walls 12 between two adjacent flow channels 2 are identified by way of example. These can be made very thin by the method according to the invention.
  • the wall thickness 13 is less than 1 mm in this example.
  • FIG. 5 shows two possible uses of a flow grille 1 according to the invention in a headbox 14 of a paper machine.
  • the exemplary headbox 14 comprises a first flow grille 1, which is designed as a pipe grille 16, and a second flow grille 1, which is designed as a turbulence generator 15.
  • a fiber suspension flows through the headbox 14 in the direction 17. It first passes the pipe grille 16, which consists of cylindrical flow channels 2, then an intermediate channel 21 and then the turbulence generator 15, which can be composed of several flow grille modules, which in turn are designed as flow grids according to Figure 1 and Figure la or according to Figure 4 and Figure 4a being be able.
  • the nozzle 20 follows directly after the turbulence generator 15.
  • a separating lamella 22 is fastened to the separating lamella holder 23 and protrudes into the nozzle 20.
  • the first end 3 of the flow channels 2 corresponds to the inflow side of the turbulence generator 15 and the second end 4 corresponds to the outflow side.
  • Holders, tie rods, and a joint for the top wall of the nozzle can be integrated on the block 5 of the flow grille 1.
  • Corresponding elements of the exemplary embodiments in the figures are provided with the same reference symbols. The functions of such elements in the individual figures correspond to one another, unless otherwise described and it does not lead to contradictions. A repeated description is therefore dispensed with. It is also pointed out that the differing features of the exemplary embodiments shown can be exchanged for one another and combined with one another. The invention is therefore not restricted to the combinations of features shown in the exemplary embodiments shown.

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  • Paper (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un tamis à flux (1) pour une caisse de tête d'une machine à papier, comprenant au moins deux canaux de flux (2) pour conduire une suspension de matière fibreuse, chacun des canaux de flux (2) ayant une première extrémité (3) et une seconde extrémité (4). L'invention est caractérisée par les étapes suivantes : a. fourniture d'un bloc (5) constitué d'un matériau électriquement conducteur, plus particulièrement de métal ; b. introduction d'au moins deux canaux rugueux (6) à l'aide d'un procédé de coupe de métal, plus particulièrement d'un procédé de forage ou de fraisage ; et c. usinage des canaux rugueux (6) à l'aide d'un procédé de fabrication électrochimique à élimination de matière afin d'obtenir la forme et la géométrie des canaux de flux (2). L'invention concerne également un tamis à flux produit au moyen du procédé selon l'invention.
EP20819685.7A 2020-02-06 2020-12-02 Tamis à flux et procédé de fabrication d'un tamis à flux Pending EP4100573A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020103003.7A DE102020103003A1 (de) 2020-02-06 2020-02-06 Strömungsgitter und Verfahren zur Herstellung eines Strömungsgitters
PCT/EP2020/084203 WO2021155974A1 (fr) 2020-02-06 2020-12-02 Tamis à flux et procédé de fabrication d'un tamis à flux

Publications (1)

Publication Number Publication Date
EP4100573A1 true EP4100573A1 (fr) 2022-12-14

Family

ID=73698821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20819685.7A Pending EP4100573A1 (fr) 2020-02-06 2020-12-02 Tamis à flux et procédé de fabrication d'un tamis à flux

Country Status (3)

Country Link
EP (1) EP4100573A1 (fr)
DE (1) DE102020103003A1 (fr)
WO (1) WO2021155974A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528882A (en) * 1964-07-23 1970-09-15 Black Clawson Co Reinforced headbox for paper machine
FI68276C (fi) 1981-06-23 1985-08-12 Valmet Oy Inloppslaoda foer pappersmaskin
DE102006046765A1 (de) * 2006-09-29 2008-04-03 Daimler Ag Verfahren zur Herstellung einer tiefen Kavität in elektrisch leitfähigem Material und Elektrode zur elektrochemischen Bearbeitung von Bohrungen
WO2008105714A1 (fr) * 2007-03-01 2008-09-04 Metso Paper Karlstad Ab Élément structurel pour un élément fonctionnel d'une caisse d'arrivée dans une machine à papier, élément fonctionnel et caisse d'arrivée fabriqués à partir de celui-ci et procédés associés
DE202009013036U1 (de) 2009-09-30 2010-02-25 Voith Patent Gmbh Führungseinrichtung für einen Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
DE102016114040A1 (de) 2016-07-29 2018-02-01 Voith Patent Gmbh Strömungsmodul und Verfahren zur Herstellung eines Strömungsmoduls für einen Stoffauflauf einer Papiermaschine
DE102017122538A1 (de) 2017-09-28 2019-03-28 Voith Patent Gmbh Verfahren und Vorrichtung zur Herstellung eines Strömungselements

Also Published As

Publication number Publication date
WO2021155974A1 (fr) 2021-08-12
DE102020103003A1 (de) 2021-08-12

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