EP1741502B1 - Method of manufacturing needles for textile machines - Google Patents

Method of manufacturing needles for textile machines Download PDF

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Publication number
EP1741502B1
EP1741502B1 EP06009159A EP06009159A EP1741502B1 EP 1741502 B1 EP1741502 B1 EP 1741502B1 EP 06009159 A EP06009159 A EP 06009159A EP 06009159 A EP06009159 A EP 06009159A EP 1741502 B1 EP1741502 B1 EP 1741502B1
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EP
European Patent Office
Prior art keywords
tongue
cheeks
needle head
injection moulding
produced
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.)
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EP06009159A
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German (de)
French (fr)
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EP1741502A1 (en
Inventor
Klaus Frietsch
Richard Hettich
Rolf Wellandt
Andreas Seidel
Gerhard Rosenfelder
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Hugo Kern und Liebers & Co KG Platinen-Und Federnfabrik GmbH
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Hugo Kern und Liebers & Co KG Platinen-Und Federnfabrik GmbH
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Publication of EP1741502A1 publication Critical patent/EP1741502A1/en
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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
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G1/00—Making needles used for performing operations
    • B21G1/02—Making needles used for performing operations of needles with eyes, e.g. sewing-needles, sewing-awls
    • B21G1/04—Making needles used for performing operations of needles with eyes, e.g. sewing-needles, sewing-awls of needles specially adapted for use in machines or 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
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/02—Knitting tools or instruments not provided for in group D04B15/00 or D04B27/00
    • D04B35/04—Latch needles

Definitions

  • the invention relates to a method for producing needles for textile machines, in particular for stitch-forming textile machines according to the preamble of patent claim 1, such a needle is from the DE 38 10481 A1 known.
  • needles In textile machines, a variety of types of needles are used, for. B. needles, needles, needles, plush hooks, etc. These needles are conventionally made in such a way that a blank is punched, which must be milled in elaborate reworking, embossed and rounded. An example of such a method is in DE 196 44 166 C1 described.
  • the mechanical properties of the needle are predetermined by the material of the blank. Different mechanical requirements in different areas of the needle can therefore be difficult to realize.
  • the invention has for its object to provide a method available with which needles can be produced economically with favorable mechanical properties.
  • At least the needle point of the needle is produced by metal injection molding (MIM).
  • MIM metal injection molding
  • the MIM process allows the production of the needle tip with high precision and low post-processing effort.
  • the mechanical properties of the needle tip can be selectively influenced and predetermined by the selection and mixing of the powder used. This makes it possible to optimally adapt these mechanical properties to the respective intended use of the needle. Changes in these properties can be carried out in a targeted manner by changing the mixture and composition of the metal powder used, it being otherwise not necessary to change the production process. It is possible in this way to produce an extensive program of different needles in an economical manner.
  • the needles have a shaft on which the needle tip is arranged.
  • the requirements for the mechanical properties and the precision of the machining are lower for the shaft than for the needle point. This can be taken into account by making only the needle tip in the MIM process while punching the shaft in a conventional manner. The needle tip is then welded to the shaft or can also be molded onto the shaft. Another advantage of making only the small needle tip in the MIM process is the savings in expensive material and furnace capacity for this process.
  • a preferred application of the method according to the invention is the production of latch needles for stitch forming textile machines in which the needle tip has a needle head and a tongue pivotally mounted in a slot of the needle head.
  • the needle head with the cheeks forming the slit and the tongue are preferably made in the MIM method, and the tongue is pivotally mounted in the cheeks with a journal bearing.
  • the needle head and the tongue are manufactured as individual parts in the MIM process.
  • a separate axle pin rotatably passes through the axle hole formed in the tongue.
  • the journal is fixed in holes in the cheeks, including the axle is pressed, for example, in the holes of the cheeks, glued, soldered or welded.
  • axle journals are integrally formed on both sides of the tongue, so that the tongue is injected in one piece with the axle journals.
  • the axle journals are rotatable in axial holes the cheeks of the needle head stored.
  • the cheeks are first widened for assembly, so that their mutual distance is greater than the slot width of the mounted needle point.
  • the cheeks are deformed against each other, so that their distance is reduced to the slot width.
  • the axial holes of the cheeks slide on the journals of the tongue, so that the tongue is mounted in the needle head. It is also possible to inject the tongue movably into the needle head.
  • the needle head can be formed in the MIM process so that the cheeks have a widened mutual distance, which allows the insertion of the tongue with the journals. Subsequently, the cheeks are bent under pressure against each other, so that their distance decreases with permanent deformation of the cheeks to the desired slot width. To position the tongue, it can be hung in one of its journals in the axle hole of a cheek before deformation.
  • the cheeks can be welded together after deformation in the region of their lower edge, which is located outside the pivoting movement of the tongue. As a result, a reliable storage of the tongue is ensured.
  • a stiffening and stabilization of the needle head against laterally transverse to the longitudinal axis of the needle attacking forces can be achieved.
  • one of the cheeks may be connected to the needle head only at one end, while the other end is bent outwardly as a free leg to provide a greater clearance to the other cheek ,
  • the tongue with the molded journal is inserted into the axle hole of one cheek, and then the bent other cheek is bent against the tongue, so that their axle hole aufschiebt on the free journal of the tongue.
  • the free end of the cheek is then fixed to the needle head, in particular by welding.
  • the shrinkage of the material used to mount the tongue in the needle head during the MIM process can also be utilized.
  • the tongue is first produced with the molded journal in the MIM process.
  • a material shrinkage of up to 22% the tongue receives its final shape and its mechanical properties.
  • the needle head is sprayed, the binder is removed from the green compact produced by spraying, so that the Braunkopf of the needle head is formed.
  • This Bhoffnling still has the shape and dimensions of the injection molding tool, so that the slot width of the needle head still has the 22% excess.
  • the sintered finished part of the tongue can be inserted into the slot of the head of the needle head due to the excess of the slot width.
  • the B syndromenling the needle head is sintered with the inserted ready-tongue.
  • the loss of material occurs in the needle head, while the already sintered tongue retains its shape. Due to the loss of material of the needle head, this shrinks while reducing the slot width on the tongue, so that the axial holes push the cheeks on the journals of the tongue and pick them up to support the tongue.
  • axle journal on the inner surface of the cheeks and to form the axle hole in the tongue.
  • the deformation of the cheeks to reduce the slot width then penetrate the journals of the cheeks in the axle hole of the tongue to produce the pivotal mounting of the tongue.
  • the needle tip made in two- or multi-component metal injection molding, so z.
  • the hook of the needle head are made of a material with high wear resistance and hardness, while the cheeks are made of a tough elastic material.
  • the tongue is also made in this case usually in one-component metal injection molding, with a wear-resistant material is selected for the tongue.
  • these different areas can also be produced as separate parts made of different materials in the MIM process.
  • the hook is manufactured as a single part from a wear-resistant material and the area of the needle head with the tongue slot is made as a separate part of a tough elastic material. The two parts are then joined together by means of welding, soldering, gluing or another joining technique.
  • the needle tip from a single material in the MIM process and the wear-prone areas of the hook and tongue superficially to coat or treat to make these areas wear-resistant.
  • a coating may, for example, from chromium, titanium nitride (TiN), titanium carbide (TiC), etc. z. B. be applied in PVD or CVD method.
  • the method according to the invention is suitable for all types of needles for textile machines, i. H. except for the needles specifically described for mesh forming textile machines also for sewing needles, felting needles, tufting needles, etc.
  • FIG. 1 the needle tip of a latch needle is shown in exploded perspective view.
  • the needle tip exists from a needle head 10 and a tongue 12.
  • the needle tip is attached to the front end of an in FIG. 1 not shown shank 14 attached.
  • the needle head 10 has a hook 16 at its front end.
  • a tongue slot 18 extending in the longitudinal direction is formed.
  • cheeks 20 which limit the tongue slot 18 laterally.
  • the width of the needle head 10 in the region of the tongue slot 18 measured perpendicular to the tongue slot 18 is about 0.9 mm.
  • the tongue slot 18 is about 0.3 mm wide, so that there is a wall thickness of the cheeks 20 of about 0.3 mm.
  • the tongue 12 is pivotally mounted in the tongue slot 18 with its rear end.
  • a journal 22 which rotatably passes through an axle hole 24 in the rear end of the tongue 12 with minimal play.
  • the journal 22 is inserted with its two ends in holes 26, which are located approximately centrally in the cheeks 20.
  • the needle tip is made by metal injection molding.
  • the needle head 10 and on the other hand the tongue 12 are produced as individual parts in the known per se Metallspritzg tellclar (MIM process).
  • MIM process per se Metallspritzg tellclar
  • a suitably selected mixture of a high-purity metal powder is mixed with a thermoplastic binder.
  • This flowable mixture is injected into the mold cavity of a tool, creating the so-called green body, which is larger in dimensions than the final molded part.
  • the binder is removed by decomposition, evaporation, etc., resulting in the so-called B Hurnling from the green body.
  • the brown compact is sintered, whereby a shrinkage of up to 22% occurs and the molded part receives its final shape and its mechanical material properties.
  • the sintered tongue 12 is inserted into the tongue slot 18 of the sintered needle head 10.
  • the axle journal 22 is inserted through the bore 26 and the axle hole 24 and fixed in the holes 26.
  • the fixation can be effected by snug fit, preferably the axle journal 22 is additionally glued, welded or the like in the holes 26.
  • the fully assembled needle tip is attached to the forward end of the shaft 14, e.g. B. welded, soldered, glued or the like.
  • the needle head 10 and the tongue 12 are each made by the MIM method.
  • axle journals 22 are formed in each case on both side surfaces of the tongue 12.
  • the journals 22 are integrally formed together with the tongue 12 in the MIM process.
  • the cheeks 20 are each formed bulged to the side, so that the tongue slot 18 is bulged in its longitudinal central region to a width which is greater than the axial distance of the ends of the journal 22.
  • the cheeks 20 are centrally in the bulged area each formed an axle hole 24.
  • FIG. 2 shows the needle head 10 and the tongue 12 in the mold made in the MIM process.
  • the tongue 12 is inserted into the widened tongue slot 18, wherein one of the axle journals 22 in the associated axle hole 24 of the cheek 20 is used for positional positioning.
  • the two cheeks 20 are bent together by pressure from the outside until the cheeks 20 have the desired distance of the width of the tongue slot 18 over its entire axial length.
  • the axle journals 22 dive into the respective axle holes 24 of the cheeks 20, so that the pivotal mounting of the tongue 12 in the tongue slot 18 of the needle head 10 is made.
  • the tongue slot 18 (as well as in the embodiment of FIG. 1 ) is continuously formed from the top to the bottom of the needle head 10.
  • FIG. 3 a modification is shown in which the tongue slot 18 is partially or completely closed on its underside, so that it forms a slot groove.
  • the two cheeks 20 each have an inwardly directed edge flange 28 at its lower longitudinal edge.
  • the two edge flanges 28 butt against each other.
  • the butt joint of the edge flanges 28 is welded, as indicated by the weld 30.
  • an edge flange 28 is formed only on the lower edge of one of the cheeks 20. This edge flange 28 abuts when bending the cheeks 20 on the opposite cheek 20 and is welded to this.
  • connection of the two cheeks 20 by the edge flanges 28 holds the two cheeks 20 stable and reliable in their final position in which they the axle journals 22 in their respective Pick up axial holes 24. Further, the connection of the cheeks 20 by the edge flanges 28 causes a stiffening of the needle head 10 in the region of the cheeks 20, so that there is an increased stability against laterally acting forces.
  • FIG. 4 shows another mounting option.
  • one of the two cheeks 20 is formed connected only at its one axial end to the needle head 10.
  • the other end of the cheek 20 remains separated during manufacture from the needle head 10, so that the cheek 20 is formed as a cantilever leg on the needle head 10.
  • the leg-shaped cheek 20 is bent with its free end to the outside, as in FIG. 4 is shown.
  • the tongue 12 can thus be used with their journals 22 in the tongue slot 18, wherein the tongue 12 is positioned with its one journal 22 in the axle hole 24 of the continuous cheek 20.
  • the leg-shaped cheek 20 is bent inwards so that its free end 32 comes to rest on the needle head 10 and the axle journal 22 of the tongue 12 is inserted into the axle hole 24 of this cheek 20.
  • the free end 32 of the cheek 20 can now be welded to the needle head 10, whereby the assembly is completed.
  • FIG. 5 shows another alternative.
  • the needle head 10 is designed so that the tongue slot 18 is open at its end facing the shaft 14.
  • Both cheeks 20 have in this way shank side free ends.
  • the cheeks 20 can thereby be bent apart in the MIM process are prepared so that they in the region of the axial holes 24 a sufficient clearance for the insertion of the tongue 12 having the journal 22.
  • the cheeks 20 are bent together so that their free ends rest on the stem 14, as shown in FIG FIG. 5 is shown, and can be welded to the shaft 14.
  • FIG. 6 shows a further embodiment in which the needle head 10 is formed in two parts.
  • a front part comprising the hook 16 is made wear-resistant by a suitable choice of the material powder for the MIM process.
  • a second part comprising the cheeks 20 is formed by an appropriate choice of powder material for the MIM process with high toughness and elasticity.
  • the two parts can, as in FIG. 6 is shown to be produced as separate parts in the MIM process and then joined together by welds. These welds can be arranged at the front end of the tongue slot 18, as in FIG. 6 is shown with a.
  • the welds in the region of the cheeks 20 in the front longitudinal section in FIG. 6 denoted by b) or in the area of the axial holes 24 (in FIG. 6 labeled c).
  • the two parts which comprise the hook 16 and the cheeks 20 can also be produced as a molded part in the two-component injection molding process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Knitting Machines (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The production process is for textile machine needles which have at least one shaft and a needle tip fitted to the front of the shaft. At least the needle tip is produced by injection molding, in particular by metal injection molding. This may be done by multiple-component injection molding, in particular by two-component injection molding.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Nadeln für Textilmaschinen, insbesondere für Maschen bildende Textilmaschinen gemäß dem Oberbegriff des Patentanspruchs 1, eine solche Nadel ist aus der DE 38 10481 A1 bekannt.The invention relates to a method for producing needles for textile machines, in particular for stitch-forming textile machines according to the preamble of patent claim 1, such a needle is from the DE 38 10481 A1 known.

Bei Textilmaschinen werden die verschiedensten Typen von Nadeln verwendet, z. B. Zungennadeln, Spitzennadeln, Schiebernadeln, Plüschhaken usw. Diese Nadeln werden herkömmlich in der Weise hergestellt, dass ein Rohling gestanzt wird, der in aufwändigen Nachbearbeitungen gefräst, geprägt und verrundet werden muss. Ein Beispiel für ein solches Verfahren ist in der DE 196 44 166 C1 beschrieben.In textile machines, a variety of types of needles are used, for. B. needles, needles, needles, plush hooks, etc. These needles are conventionally made in such a way that a blank is punched, which must be milled in elaborate reworking, embossed and rounded. An example of such a method is in DE 196 44 166 C1 described.

Neben dem aufwändigen Herstellungsverfahren ist hierbei typisch, dass die mechanischen Eigenschaften der Nadel durch den Werkstoff des Rohlings vorgegeben sind. Unterschiedliche mechanische Anforderungen in verschiedenen Bereichen der Nadel können daher nur schwer realisiert werden.In addition to the elaborate manufacturing process, it is typical here that the mechanical properties of the needle are predetermined by the material of the blank. Different mechanical requirements in different areas of the needle can therefore be difficult to realize.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Verfügung zu stellen, mit welchem Nadeln mit günstigen mechanischen Eigenschaften wirtschaftlich hergestellt werden können.The invention has for its object to provide a method available with which needles can be produced economically with favorable mechanical properties.

Diese Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren mit den Merkmalen des Patentanspruchs 1.This object is achieved by a method with the features of claim 1.

Vorteilhafte Ausführungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.

Erfindungsgemäß wird zumindest die Nadelspitze der Nadel durch Metallspritzgießen (Metal Injection Molding, MIM) hergestellt.According to the invention, at least the needle point of the needle is produced by metal injection molding (MIM).

Das MIM-Verfahren ermöglicht die Herstellung der Nadelspitze mit hoher Präzision und geringem Nachbearbeitungsaufwand. Die mechanischen Eigenschaften der Nadelspitze können durch die Auswahl und die Mischung des verwendeten Pulvers gezielt beeinflusst und vorbestimmt werden. Dadurch ist es möglich, diese mechanischen Eigenschaften dem jeweiligen Verwendungszweck der Nadel optimiert anzupassen. Änderungen dieser Eigenschaften können gezielt durch Änderung der Mischung und Zusammensetzung des verwendeten Metallpulvers durchgeführt werden, wobei gegebenenfalls der Herstellungsprozess im Übrigen nicht verändert werden muss. Es ist auf diese Weise möglich, ein umfangreiches Programm von unterschiedlichen Nadeln in wirtschaftlicher Weise herzustellen.The MIM process allows the production of the needle tip with high precision and low post-processing effort. The mechanical properties of the needle tip can be selectively influenced and predetermined by the selection and mixing of the powder used. This makes it possible to optimally adapt these mechanical properties to the respective intended use of the needle. Changes in these properties can be carried out in a targeted manner by changing the mixture and composition of the metal powder used, it being otherwise not necessary to change the production process. It is possible in this way to produce an extensive program of different needles in an economical manner.

In der Regel weisen die Nadeln einen Schaft auf, an welchem die Nadelspitze angeordnet ist. Die Anforderungen an die mechanischen Eigenschaften und an die Präzision der Bearbeitung sind für den Schaft geringer als für die Nadelspitze. Dies kann dadurch berücksichtigt werden, dass nur die Nadelspitze im MIM-Verfahren hergestellt wird, während der Schaft in herkömmlicher Weise gestanzt wird. Die Nadelspitze wird dann an den Schaft angeschweißt oder kann auch an den Schaft angespritzt werden. Ein weiterer Vorteil der Herstellung nur der kleinen Nadelspitze im MIM-Verfahren liegt in der Einsparung an teuerem Material und Ofenkapazität für dieses Verfahren.In general, the needles have a shaft on which the needle tip is arranged. The requirements for the mechanical properties and the precision of the machining are lower for the shaft than for the needle point. This can be taken into account by making only the needle tip in the MIM process while punching the shaft in a conventional manner. The needle tip is then welded to the shaft or can also be molded onto the shaft. Another advantage of making only the small needle tip in the MIM process is the savings in expensive material and furnace capacity for this process.

Bei vielen Nadeln, z. B. bei den für Maschen bildende Textilmaschinen verwendeten Zungennadeln, sind die mechanischen Anforderungen für verschiedene Bereiche der Nadelspitze unterschiedlich. Die den Faden fassenden und führenden Teile der Nadelspitze, z. B. der Haken des Nadelkopfes und die Zunge, sind einem starken Verschleiß ausgesetzt, während andere Bereiche der Nadelspitze, z. B. die die Nadelspitze mit dem Schaft verbindenden Bereiche, vor allem Biegekräften ausgesetzt sind. Diese unterschiedliche Beanspruchung kann erfindungsgemäß dadurch berücksichtigt werden, dass die Nadelspitze im Mehrkomponenten-Spritzgießen, insbesondere im Zweikomponenten-Spritzgießen, hergestellt wird. Die insbesondere verschleißbelasteten Bereiche der Nadelspitze können auf diese Weise aus einem verschleißfesten harten Werkstoff hergestellt werden, z. B. aus Hartmetall, Keramik oder dergleichen, während die insbesondere elastischen Biegebeanspruchungen ausgesetzten Bereiche aus einem zähen elastischen Werkstoff hergestellt werden, z. B. aus Werkzeugstahl, Edelstahl, Vergütungsstahl, Einsatzstahl oder dergleichen.For many needles, z. For example, in the stitch-forming textile machines used latch needles, the mechanical requirements for different areas of the needle tip are different. The thread grabbing and leading parts of the needle tip, z. As the hook of the needle head and the tongue, are exposed to heavy wear, while other areas of the needle tip, z. B. the needle tip with the Shank connecting areas, especially bending forces are exposed. This different stress can be considered according to the invention that the needle tip in multi-component injection molding, especially in two-component injection molding, is produced. The particular wear-loaded areas of the needle tip can be made in this way from a wear-resistant hard material, z. As hard metal, ceramic or the like, while the particular elastic bending stresses exposed areas are made of a tough elastic material, for. B. tool steel, stainless steel, tempered steel, case hardened steel or the like.

Eine bevorzugte Anwendung des erfindungsgemäßen Verfahrens ist die Herstellung von Zungennadeln für Maschen bildende Textilmaschinen, bei welchen die Nadelspitze einen Nadelkopf und eine in einem Schlitz des Nadelkopfes schwenkbar gelagerte Zunge aufweist. Bei solchen Nadeln werden vorzugsweise der Nadelkopf mit den den Schlitz bildenden Wangen und die Zunge im MIM-Verfahren hergestellt und die Zunge wird mit einer Achszapfen-Achsloch-Lagerung schwenkbar in den Wangen gelagert.A preferred application of the method according to the invention is the production of latch needles for stitch forming textile machines in which the needle tip has a needle head and a tongue pivotally mounted in a slot of the needle head. In such needles, the needle head with the cheeks forming the slit and the tongue are preferably made in the MIM method, and the tongue is pivotally mounted in the cheeks with a journal bearing.

In einer einfachen Ausführung werden dabei der Nadelkopf und die Zunge als Einzelteile im MIM-Verfahren hergestellt. Ein separater Achszapfen durchsetzt drehbar das in der Zunge ausgebildete Achsloch. Der Achszapfen wird in Bohrungen der Wangen fixiert, wozu der Achszapfen beispielsweise in die Bohrungen der Wangen eingepresst, eingeklebt, eingelötet oder eingeschweißt wird.In a simple design, the needle head and the tongue are manufactured as individual parts in the MIM process. A separate axle pin rotatably passes through the axle hole formed in the tongue. The journal is fixed in holes in the cheeks, including the axle is pressed, for example, in the holes of the cheeks, glued, soldered or welded.

In einer anderen Ausführung sind beidseitig an der Zunge Achszapfen angeformt, sodass die Zunge mit den Achszapfen einstückig gespritzt wird. Die Achszapfen sind drehbar in Achslöchern der Wangen des Nadelkopfes gelagert. Um die Achszapfen in die Achslöcher einzusetzen, werden für die Montage die Wangen zunächst aufgeweitet, sodass ihr gegenseitiger Abstand größer ist als die Schlitzbreite der montierten Nadelspitze. Nach dem Einsetzen der Zunge mit den angeformten Achszapfen werden die Wangen gegeneinander verformt, sodass sich ihr Abstand auf die Schlitzbreite verringert. Dabei schieben sich die Achslöcher der Wangen auf die Achszapfen der Zunge, sodass die Zunge in dem Nadelkopf gelagert ist. Es ist auch möglich, die Zunge beweglich in den Nadelkopf einzuspritzen.In another embodiment, axle journals are integrally formed on both sides of the tongue, so that the tongue is injected in one piece with the axle journals. The axle journals are rotatable in axial holes the cheeks of the needle head stored. To insert the journals in the axle holes, the cheeks are first widened for assembly, so that their mutual distance is greater than the slot width of the mounted needle point. After insertion of the tongue with the molded journal the cheeks are deformed against each other, so that their distance is reduced to the slot width. The axial holes of the cheeks slide on the journals of the tongue, so that the tongue is mounted in the needle head. It is also possible to inject the tongue movably into the needle head.

Für das Aufweiten und Verformen der Wangen des Nadelkopfes sind verschiedene Möglichkeiten vorgesehen.For the expansion and deformation of the cheeks of the needle head various possibilities are provided.

Der Nadelkopf kann im MIM-Verfahren so geformt werden, dass die Wangen einen aufgeweiteten gegenseitigen Abstand aufweisen, der das Einführen der Zunge mit den Achszapfen erlaubt. Anschließend werden die Wangen unter Druck gegeneinander verbogen, sodass sich ihr Abstand unter bleibender Verformung der Wangen auf die gewünschte Schlitzbreite verringert. Zur Positionierung der Zunge kann diese dabei vor der Verformung mit einem ihrer Achszapfen in das Achsloch der einen Wange eingehängt werden.The needle head can be formed in the MIM process so that the cheeks have a widened mutual distance, which allows the insertion of the tongue with the journals. Subsequently, the cheeks are bent under pressure against each other, so that their distance decreases with permanent deformation of the cheeks to the desired slot width. To position the tongue, it can be hung in one of its journals in the axle hole of a cheek before deformation.

Um eine zuverlässige Formstabilität der Wangen in der montierten Position zu gewährleisten, können die Wangen nach der Verformung im Bereich ihrer Unterkante, die sich außerhalb der Schwenkbewegung der Zunge befindet, miteinander verschweißt werden. Dadurch wird eine zuverlässige Lagerung der Zunge sichergestellt. Außerdem kann dadurch erforderlichenfalls eine Versteifung und Stabilisierung des Nadelkopfes gegen seitlich quer zur Längsachse der Nadel angreifende Kräfte erreicht werden.In order to ensure a reliable dimensional stability of the cheeks in the mounted position, the cheeks can be welded together after deformation in the region of their lower edge, which is located outside the pivoting movement of the tongue. As a result, a reliable storage of the tongue is ensured. In addition, if necessary, a stiffening and stabilization of the needle head against laterally transverse to the longitudinal axis of the needle attacking forces can be achieved.

In einer anderen Ausführung kann bei der Herstellung des Nadelkopfes im MIM-Verfahren eine der Wangen nur an einem Ende mit dem Nadelkopf verbunden sein, während das andere Ende als freier Schenkel nach außen gebogen ist, um einen größeren freien Abstand zu der anderen Wange zu erhalten. Die Zunge mit den angeformten Achszapfen wird in das Achsloch der einen Wange eingelegt und anschließend wird die aufgebogene andere Wange gegen die Zunge gebogen, sodass sich ihr Achsloch auf den freien Achszapfen der Zunge aufschiebt. Das freie Ende der Wange wird dann an dem Nadelkopf fixiert, insbesondere durch Verschweißen.In another embodiment, in the manufacture of the needle head in the MIM method, one of the cheeks may be connected to the needle head only at one end, while the other end is bent outwardly as a free leg to provide a greater clearance to the other cheek , The tongue with the molded journal is inserted into the axle hole of one cheek, and then the bent other cheek is bent against the tongue, so that their axle hole aufschiebt on the free journal of the tongue. The free end of the cheek is then fixed to the needle head, in particular by welding.

Schließlich kann auch der beim MIM-Verfahren auftretende Schwund des Materials zur Montage der Zunge in dem Nadelkopf ausgenützt werden. Bei dieser Alternative wird zunächst die Zunge mit den angeformten Achszapfen im MIM-Verfahren hergestellt. Beim Sintern des Bräunlings der Zunge tritt dabei ein Materialschwund von bis zu 22% auf, wobei die Zunge ihre endgültige Form und ihre mechanischen Eigenschaften erhält. Der Nadelkopf wird gespritzt, das Bindemittel wird aus dem durch das Spritzen erzeugten Grünling entfernt, sodass der Bräunling des Nadelkopfes entsteht. Dieser Bräunling hat noch die Form und Abmessungen des Spritzgusswerkzeugs, sodass auch die Schlitzbreite des Nadelkopfes noch das 22%ige Übermaß aufweist. Das gesinterte Fertigteil der Zunge kann aufgrund des Übermaßes der Schlitzbreite in den Schlitz des Bräunlings des Nadelkopfes eingesetzt werden. Daraufhin wird der Bräunling des Nadelkopfes mit der eingesetzten Fertig-Zunge gesintert. Dabei tritt der Materialschwund in dem Nadelkopf auf, während die bereits gesinterte Zunge ihre Form beibehält. Durch den Materialschwund des Nadelkopfes schrumpft dieser unter Reduzierung der Schlitzbreite auf die Zunge, sodass sich die Achslöcher der Wangen auf die Achszapfen der Zunge schieben und diese zur Lagerung der Zunge aufnehmen.Finally, the shrinkage of the material used to mount the tongue in the needle head during the MIM process can also be utilized. In this alternative, the tongue is first produced with the molded journal in the MIM process. During sintering of the browning of the tongue occurs a material shrinkage of up to 22%, the tongue receives its final shape and its mechanical properties. The needle head is sprayed, the binder is removed from the green compact produced by spraying, so that the Braunkopf of the needle head is formed. This Bräunling still has the shape and dimensions of the injection molding tool, so that the slot width of the needle head still has the 22% excess. The sintered finished part of the tongue can be inserted into the slot of the head of the needle head due to the excess of the slot width. Then the Bräunling the needle head is sintered with the inserted ready-tongue. The loss of material occurs in the needle head, while the already sintered tongue retains its shape. Due to the loss of material of the needle head, this shrinks while reducing the slot width on the tongue, so that the axial holes push the cheeks on the journals of the tongue and pick them up to support the tongue.

Selbstverständlich ist es auch möglich, an der Innenfläche der Wangen jeweils einen Achszapfen anzuformen und das Achsloch in der Zunge auszubilden. Bei der Verformung der Wangen zur Reduzierung der Schlitzbreite dringen dann die Achszapfen der Wangen in das Achsloch der Zunge ein, um die schwenkbare Lagerung der Zunge herzustellen.Of course, it is also possible to form an axle journal on the inner surface of the cheeks and to form the axle hole in the tongue. In the deformation of the cheeks to reduce the slot width then penetrate the journals of the cheeks in the axle hole of the tongue to produce the pivotal mounting of the tongue.

Wird die Nadelspitze im Zwei- oder Mehrkomponenten-Metallspritzgießverfahren hergestellt, so können z. B. der Haken des Nadelkopfes aus einem Werkstoff mit hoher Verschleißfestigkeit und Härte hergestellt werden, während die Wangen aus einem zähen elastischen Werkstoff hergestellt werden. Die Zunge wird auch in diesem Falle in der Regel im Einkomponenten-Metallspritzgießen hergestellt, wobei für die Zunge ein verschleißfester Werkstoff gewählt wird.If the needle tip made in two- or multi-component metal injection molding, so z. As the hook of the needle head are made of a material with high wear resistance and hardness, while the cheeks are made of a tough elastic material. The tongue is also made in this case usually in one-component metal injection molding, with a wear-resistant material is selected for the tongue.

Um die verschiedenen Bereiche der Nadelspitze mit unterschiedlichen mechanischen Eigenschaften auszubilden, können diese verschiedenen Bereiche auch als getrennte Teile aus unterschiedlichen Werkstoffen im MIM-Verfahren hergestellt werden. Es wird beispielsweise der Haken als Einzelteil aus einem verschleißfesten Werkstoff hergestellt und der Bereich des Nadelkopfes mit dem Zungenschlitz wird als separates Teil aus einem zähen elastischen Werkstoff hergestellt. Die beiden Teile werden dann mittels Schweißen, Löten, Kleben oder einer sonstigen Fügetechnik miteinander verbunden.In order to form the different areas of the needle tip with different mechanical properties, these different areas can also be produced as separate parts made of different materials in the MIM process. For example, the hook is manufactured as a single part from a wear-resistant material and the area of the needle head with the tongue slot is made as a separate part of a tough elastic material. The two parts are then joined together by means of welding, soldering, gluing or another joining technique.

Schließlich ist es auch möglich, die Nadelspitze aus einem einzigen Werkstoff im MIM-Verfahren herzustellen und die verschleißbeanspruchten Bereiche des Hakens und der Zunge oberflächlich zu beschichten bzw. zu behandeln, um diese Bereiche verschleißfest zu machen. Eine solche Beschichtung kann bspw. aus Chrom, Titannitrid (TiN), Titancarbid (TiC) usw. z. B. im PVD- oder CVD-Verfahren aufgebracht werden.Finally, it is also possible to make the needle tip from a single material in the MIM process and the wear-prone areas of the hook and tongue superficially to coat or treat to make these areas wear-resistant. Such a coating may, for example, from chromium, titanium nitride (TiN), titanium carbide (TiC), etc. z. B. be applied in PVD or CVD method.

Es ist offensichtlich, dass sich das erfindungsgemäße Verfahren für alle Arten von Nadeln für Textilmaschinen eignet, d. h. außer den speziell beschriebenen Nadeln für Maschen bildende Textilmaschinen auch für Nähnadeln, Filznadeln, Tuftingnadeln usw.It is obvious that the method according to the invention is suitable for all types of needles for textile machines, i. H. except for the needles specifically described for mesh forming textile machines also for sewing needles, felting needles, tufting needles, etc.

Im Folgenden wird die Erfindung anhand von in der Zeichnung dargestellten Ausführungsbeispielen erläutert. Es zeigen

Fig. 1
in perspektivischer Explosionsdarstellung eine Nadelspitze in einer ersten Ausführung,
Fig. 2
in einer entsprechenden Darstellung eine zweite Ausführung der Nadelspitze,
Fig. 3
im Querschnitt den Nadelkopf im Bereich des Zungenschlitzes in einer dritten Ausführung,
Fig. 4
perspektivisch den Nadelkopf in einer vierten Ausführung,
Fig. 5
den Nadelkopf mit dem Schaft in einer fünften Ausführung und
Fig. 6
den Nadelkopf in einer sechsten Ausführung.
In the following the invention will be explained with reference to embodiments shown in the drawing. Show it
Fig. 1
in a perspective exploded view of a needle tip in a first embodiment,
Fig. 2
in a corresponding representation, a second embodiment of the needle tip,
Fig. 3
in cross-section the needle head in the region of the tongue slot in a third embodiment,
Fig. 4
in perspective the needle head in a fourth embodiment,
Fig. 5
the needle head with the shaft in a fifth embodiment and
Fig. 6
the needle head in a sixth embodiment.

In Figur 1 ist die Nadelspitze einer Zungennadel in perspektivischer Explosionsdarstellung gezeigt. Die Nadelspitze besteht aus einem Nadelkopf 10 und einer Zunge 12. Die Nadelspitze wird an dem vorderen Ende eines in Figur 1 nicht gezeigten Schaftes 14 befestigt.In FIG. 1 the needle tip of a latch needle is shown in exploded perspective view. The needle tip exists from a needle head 10 and a tongue 12. The needle tip is attached to the front end of an in FIG. 1 not shown shank 14 attached.

Der Nadelkopf 10 weist an seinem vorderen Ende einen Haken 16 auf. In dem Nadelkopf 10 ist ein in Längsrichtung verlaufender Zungenschlitz 18 ausgebildet. Beiderseits des Zungenschlitzes 18 bildet der Nadelkopf Wangen 20, die den Zungenschlitz 18 seitlich begrenzen. In einem typischen Fall beträgt die Breite des Nadelkopfes 10 im Bereich des Zungenschlitzes 18 senkrecht zu dem Zungenschlitz 18 gemessen etwa 0,9 mm. Der Zungenschlitz 18 ist etwa 0,3 mm breit, sodass sich eine Wandstärke der Wangen 20 von jeweils etwa 0,3 mm ergibt. Die Zunge 12 ist mit ihrem hinteren Ende schwenkbar in dem Zungenschlitz 18 gelagert. Hierzu dient ein Achszapfen 22, der mit minimalem Spiel drehbar ein Achsloch 24 im hinteren Ende der Zunge 12 durchsetzt. Der Achszapfen 22 ist mit seinen beiden Enden in Bohrungen 26 eingesetzt, die sich etwa flächenmittig in den Wangen 20 befinden.The needle head 10 has a hook 16 at its front end. In the needle head 10, a tongue slot 18 extending in the longitudinal direction is formed. On both sides of the tongue slot 18 of the needle head forms cheeks 20, which limit the tongue slot 18 laterally. In a typical case, the width of the needle head 10 in the region of the tongue slot 18 measured perpendicular to the tongue slot 18 is about 0.9 mm. The tongue slot 18 is about 0.3 mm wide, so that there is a wall thickness of the cheeks 20 of about 0.3 mm. The tongue 12 is pivotally mounted in the tongue slot 18 with its rear end. For this purpose, a journal 22 which rotatably passes through an axle hole 24 in the rear end of the tongue 12 with minimal play. The journal 22 is inserted with its two ends in holes 26, which are located approximately centrally in the cheeks 20.

Die Nadelspitze wird durch Metallspritzgießen hergestellt. Hierzu werden zum einen der Nadelkopf 10 und zum anderen die Zunge 12 als Einzelteile in dem an sich bekannten Metallspritzgießverfahren (MIM-Verfahren) hergestellt. Bei diesem Verfahren wird ein geeignet gewähltes Gemisch eines hochfeinen Metallpulvers mit einem thermoplastischen Bindemittel vermischt. Dieses fließfähige Gemisch wird in den Formhohlraum eines Werkzeuges eingespritzt, wodurch der sogenannte Grünling entsteht, der in seinen Dimensionen größer als das endgültige Formteil ist. Anschließend wird das Bindemittel durch Zersetzen, Verdampfen usw. entfernt, wodurch aus dem Grünling der sogenannte Bräunling entsteht. Dieser hat noch im Wesentlichen die ursprünglichen Abmessungen des Formwerkzeugs und ist noch empfindlich, porös und bruchgefährdet. Anschließend wird der Bräunling gesintert, wobei ein Schwund von bis zu 22% eintritt und das Formteil seine endgültige Form und seine mechanischen Materialeigenschaften erhält.The needle tip is made by metal injection molding. For this purpose, on the one hand the needle head 10 and on the other hand the tongue 12 are produced as individual parts in the known per se Metallspritzgießverfahren (MIM process). In this method, a suitably selected mixture of a high-purity metal powder is mixed with a thermoplastic binder. This flowable mixture is injected into the mold cavity of a tool, creating the so-called green body, which is larger in dimensions than the final molded part. Subsequently, the binder is removed by decomposition, evaporation, etc., resulting in the so-called Bräunling from the green body. This still has essentially the original dimensions of the mold and is still sensitive, porous and at risk of breakage. Subsequently, the brown compact is sintered, whereby a shrinkage of up to 22% occurs and the molded part receives its final shape and its mechanical material properties.

Die gesinterte Zunge 12 wird in den Zungenschlitz 18 des gesinterten Nadelkopfes 10 eingesetzt. Dann wird der Achszapfen 22 durch die Bohrung 26 und das Achsloch 24 eingesteckt und in den Bohrungen 26 fixiert. Die Fixierung kann durch Passsitz bewirkt werden, vorzugsweise wird der Achszapfen 22 in den Bohrungen 26 zusätzlich verklebt, verschweißt oder dergleichen.The sintered tongue 12 is inserted into the tongue slot 18 of the sintered needle head 10. Then the axle journal 22 is inserted through the bore 26 and the axle hole 24 and fixed in the holes 26. The fixation can be effected by snug fit, preferably the axle journal 22 is additionally glued, welded or the like in the holes 26.

Die fertig montierte Nadelspitze wird an dem vorderen Ende des Schaftes 14 befestigt, z. B. angeschweißt, angelötet, angeklebt oder dergleichen.The fully assembled needle tip is attached to the forward end of the shaft 14, e.g. B. welded, soldered, glued or the like.

In dem Ausführungsbeispiel der Figur 2 werden der Nadelkopf 10 und die Zunge 12 ebenfalls jeweils im MIM-Verfahren hergestellt. Dabei werden jedoch für die schwenkbare Lagerung der Zunge 12 in dem Zungenschlitz 18 Achszapfen 22 jeweils auf beiden Seitenflächen der Zunge 12 angeformt. Die Achszapfen 22 werden zusammen mit der Zunge 12 im MIM-Verfahren einstückig ausgebildet.In the embodiment of FIG. 2 For example, the needle head 10 and the tongue 12 are each made by the MIM method. However, for the pivotable mounting of the tongue 12 in the tongue slot 18 axle journals 22 are formed in each case on both side surfaces of the tongue 12. The journals 22 are integrally formed together with the tongue 12 in the MIM process.

Bei dem Nadelkopf 10 werden die Wangen 20 jeweils nach der Seite ausgewölbt geformt, sodass der Zungenschlitz 18 in seinem Längsmittelbereich auf eine Breite bauchig aufgeweitet ist, die größer ist als der axiale Abstand der Enden der Achszapfen 22. In den Wangen 20 sind flächenmittig in dem ausgewölbten Bereich jeweils ein Achsloch 24 ausgebildet.In the needle head 10, the cheeks 20 are each formed bulged to the side, so that the tongue slot 18 is bulged in its longitudinal central region to a width which is greater than the axial distance of the ends of the journal 22. In the cheeks 20 are centrally in the bulged area each formed an axle hole 24.

Figur 2 zeigt den Nadelkopf 10 und die Zunge 12 in der im MIM-Verfahren hergestellten Form. Für die Montage der Nadelspitze wird die Zunge 12 in den aufgeweiteten Zungenschlitz 18 eingesetzt, wobei zur Lagepositionierung einer der Achszapfen 22 in das zugehörige Achsloch 24 der Wange 20 eingesetzt wird. Dann werden die beiden Wangen 20 durch Druck von der Außenseite zusammengebogen, bis die Wangen 20 über ihre gesamte axiale Länge den gewünschten Abstand der Breite des Zungenschlitzes 18 aufweisen. Bei diesem Zusammenbiegen der Wangen 20 tauchen die Achszapfen 22 in die jeweiligen Achslöcher 24 der Wangen 20 ein, sodass die Schwenklagerung der Zunge 12 in dem Zungenschlitz 18 des Nadelkopfes 10 hergestellt ist. FIG. 2 shows the needle head 10 and the tongue 12 in the mold made in the MIM process. For the assembly of the needle tip, the tongue 12 is inserted into the widened tongue slot 18, wherein one of the axle journals 22 in the associated axle hole 24 of the cheek 20 is used for positional positioning. Then, the two cheeks 20 are bent together by pressure from the outside until the cheeks 20 have the desired distance of the width of the tongue slot 18 over its entire axial length. In this bending of the cheeks 20, the axle journals 22 dive into the respective axle holes 24 of the cheeks 20, so that the pivotal mounting of the tongue 12 in the tongue slot 18 of the needle head 10 is made.

In dem Ausführungsbeispiel der Figur 2 ist der Zungenschlitz 18 (ebenso wie in dem Ausführungsbeispiel der Figur 1) von der Oberseite zur Unterseite des Nadelkopfes 10 durchgehend ausgebildet. In Figur 3 ist eine Abwandlung dargestellt, in welcher der Zungenschlitz 18 an seiner Unterseite teilweise oder ganz geschlossen ist, sodass er eine Schlitznut bildet. In dem Beispiel der Figur 3a weisen hierzu die beiden Wangen 20 an ihrer unteren Längskante jeweils einen nach innen gerichteten Randflansch 28 auf. Beim Zusammenbiegen der Wangen 20 stoßen die beiden Randflansche 28 stumpf gegeneinander. Die Stoßfuge der Randflansche 28 wird verschweißt, wie dies durch die Schweißnaht 30 angedeutet ist. In der Variante gemäß Figur 3b ist ein Randflansch 28 nur an der Unterkante einer der Wangen 20 ausgebildet. Dieser Randflansch 28 legt sich beim Zusammenbiegen der Wangen 20 an der gegenüberliegenden Wange 20 an und wird mit dieser verschweißt.In the embodiment of FIG. 2 is the tongue slot 18 (as well as in the embodiment of FIG. 1 ) is continuously formed from the top to the bottom of the needle head 10. In FIG. 3 a modification is shown in which the tongue slot 18 is partially or completely closed on its underside, so that it forms a slot groove. In the example of FIG. 3a For this purpose, the two cheeks 20 each have an inwardly directed edge flange 28 at its lower longitudinal edge. When bending the cheeks 20, the two edge flanges 28 butt against each other. The butt joint of the edge flanges 28 is welded, as indicated by the weld 30. In the variant according to FIG. 3b an edge flange 28 is formed only on the lower edge of one of the cheeks 20. This edge flange 28 abuts when bending the cheeks 20 on the opposite cheek 20 and is welded to this.

Die Verbindung der beiden Wangen 20 durch die Randflansche 28 hält die beiden Wangen 20 stabil und zuverlässig in ihrer Endposition, in welcher sie die Achszapfen 22 in ihren jeweiligen Achslöchern 24 aufnehmen. Weiter bewirkt die Verbindung der Wangen 20 durch die Randflansche 28 eine Versteifung des Nadelkopfes 10 im Bereich der Wangen 20, sodass sich eine erhöhte Stabilität gegenüber seitlich einwirkenden Kräften ergibt.The connection of the two cheeks 20 by the edge flanges 28 holds the two cheeks 20 stable and reliable in their final position in which they the axle journals 22 in their respective Pick up axial holes 24. Further, the connection of the cheeks 20 by the edge flanges 28 causes a stiffening of the needle head 10 in the region of the cheeks 20, so that there is an increased stability against laterally acting forces.

Figur 4 zeigt eine weitere Montagemöglichkeit. Hierbei wird bei der Herstellung des Nadelkopfes 10 im MIM-Verfahren eine der beiden Wangen 20 nur an ihrem einen axialen Ende mit dem Nadelkopf 10 verbunden geformt. Das andere Ende der Wange 20 bleibt bei der Herstellung von dem Nadelkopf 10 getrennt, sodass die Wange 20 als frei ragende Schenkel an dem Nadelkopf 10 angeformt ist. Die schenkelförmige Wange 20 ist dabei mit ihrem freien Ende nach außen gebogen, wie dies in Figur 4 dargestellt ist. Dadurch ergibt sich im Bereich der Achslöcher 24 ein lichter Innenabstand der Wangen 20, der größer ist als der axiale Abstand der Endflächen der Achszapfen 22 der Zunge 12. Die Zunge 12 kann somit mit ihren Achszapfen 22 in den Zungenschlitz 18 eingesetzt werden, wobei die Zunge 12 mit ihrem einen Achszapfen 22 in dem Achsloch 24 der durchgehenden Wange 20 positioniert wird. Nun wird die schenkelförmige Wange 20 nach innen gebogen, sodass ihr freies Ende 32 zur Anlage an dem Nadelkopf 10 kommt und der Achszapfen 22 der Zunge 12 in das Achsloch 24 dieser Wange 20 eintaucht. Das freie Ende 32 der Wange 20 kann nun mit dem Nadelkopf 10 verschweißt werden, wodurch die Montage beendet ist. FIG. 4 shows another mounting option. Here, in the production of the needle head 10 in the MIM method, one of the two cheeks 20 is formed connected only at its one axial end to the needle head 10. The other end of the cheek 20 remains separated during manufacture from the needle head 10, so that the cheek 20 is formed as a cantilever leg on the needle head 10. The leg-shaped cheek 20 is bent with its free end to the outside, as in FIG. 4 is shown. This results in the area of the axial holes 24, a clear inner spacing of the cheeks 20, which is greater than the axial distance of the end surfaces of the journal 22 of the tongue 12. The tongue 12 can thus be used with their journals 22 in the tongue slot 18, wherein the tongue 12 is positioned with its one journal 22 in the axle hole 24 of the continuous cheek 20. Now, the leg-shaped cheek 20 is bent inwards so that its free end 32 comes to rest on the needle head 10 and the axle journal 22 of the tongue 12 is inserted into the axle hole 24 of this cheek 20. The free end 32 of the cheek 20 can now be welded to the needle head 10, whereby the assembly is completed.

Figur 5 zeigt eine weitere Alternative. In dieser Ausführung ist der Nadelkopf 10 so gestaltet, dass der Zungenschlitz 18 an seinem dem Schaft 14 zugewandten Ende offen ist. Beide Wangen 20 besitzen auf diese Weise schaftseitig freie Enden. Die Wangen 20 können dadurch auseinander gebogen im MIM-Verfahren hergestellt werden, sodass sie im Bereich der Achslöcher 24 einen ausreichenden lichten Abstand für das Einsetzen der Zunge 12 mit dem Achszapfen 22 aufweisen. Nach dem Einsetzen der Zunge 12 werden die Wangen 20 zusammengebogen, sodass sich ihre freien Enden an dem Schaft 14 anlegen, wie dies in Figur 5 gezeigt ist, und mit dem Schaft 14 verschweißt werden können. FIG. 5 shows another alternative. In this embodiment, the needle head 10 is designed so that the tongue slot 18 is open at its end facing the shaft 14. Both cheeks 20 have in this way shank side free ends. The cheeks 20 can thereby be bent apart in the MIM process are prepared so that they in the region of the axial holes 24 a sufficient clearance for the insertion of the tongue 12 having the journal 22. After insertion of the tongue 12, the cheeks 20 are bent together so that their free ends rest on the stem 14, as shown in FIG FIG. 5 is shown, and can be welded to the shaft 14.

Figur 6 zeigt eine weitere Ausbildung, bei welcher der Nadelkopf 10 zweiteilig ausgebildet ist. Ein vorderer Teil, der den Haken 16 umfasst, wird durch geeignete Wahl des Werkstoffpulvers für das MIM-Verfahren verschleißfest ausgebildet. Ein zweiter Teil, der die Wangen 20 umfasst, wird durch eine entsprechend Wahl des Pulverwerkstoffes für das MIM-Verfahren mit hoher Zähigkeit und Elastizität ausgebildet. Die beiden Teile können, wie dies in Figur 6 dargestellt ist, als getrennte Teile im MIM-Verfahren hergestellt werden und anschließend durch Schweißnähte miteinander verbunden werden. Diese Schweißnähte können dabei am vorderen Ende des Zungenschlitzes 18 angeordnet sein, wie dies in Figur 6 mit a gezeigt ist. Ebenso können die Schweißnähte im Bereich der Wangen 20 in deren vorderen Längenabschnitt (in Figur 6 mit b bezeichnet) oder im Bereich der Achslöcher 24 (in Figur 6 mit c bezeichnet) angeordnet sein. FIG. 6 shows a further embodiment in which the needle head 10 is formed in two parts. A front part comprising the hook 16 is made wear-resistant by a suitable choice of the material powder for the MIM process. A second part comprising the cheeks 20 is formed by an appropriate choice of powder material for the MIM process with high toughness and elasticity. The two parts can, as in FIG. 6 is shown to be produced as separate parts in the MIM process and then joined together by welds. These welds can be arranged at the front end of the tongue slot 18, as in FIG. 6 is shown with a. Likewise, the welds in the region of the cheeks 20 in the front longitudinal section (in FIG. 6 denoted by b) or in the area of the axial holes 24 (in FIG. 6 labeled c).

Anstelle einer getrennten Herstellung der beiden Teile mit anschließendem Zusammenschweißen können die beiden Teile, die den Haken 16 bzw. die Wangen 20 umfassen, auch als ein Formteil im Zweikomponenten-Spritzgussverfahren hergestellt werden.Instead of a separate production of the two parts with subsequent welding together, the two parts which comprise the hook 16 and the cheeks 20 can also be produced as a molded part in the two-component injection molding process.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Nadelkopfpinhead
1212
Zungetongue
1414
Schaftshaft
1616
Hakenhook
1818
Zungenschlitzlatch slot
2020
WangenWangen
2222
Achszapfenjournal
2424
Achslochaxle hole
2626
Bohrungendrilling
2828
Randflanschedge flange
3030
SchweißnahtWeld
3232
freies Endefree end

Claims (14)

  1. A method for manufacturing needles for textile machines, in particular for textile machines forming mesh, wherein the needles comprise at least one shank and a needle tip disposed on the front end of the shank,
    characterised in that at least the needle tip is produced by injection moulding, in particular by metal injection moulding (MIM).
  2. A method according to Claim 1,
    characterised in that the needle tip is produced in multicomponent injection moulding, in particular in two-component injection moulding.
  3. A method according to Claim 2,
    characterised in that the parts of the needle tip subjected to wear are produced from a wear-resistant, hard material, in particular hard metal, oxide ceramics or the like, or are coated with such a material,
    and in that the parts of the needle tip that are subjected to deformation are produced from a tough elastic material, in particular tool steel, stainless steel, heat-treated steel or case-hardened steel steel.
  4. A method according to one of Claims 1 to 3 for manufacturing needles, in which the needle tip comprises a needle head with a tongue swivel-mounted in a tongue slot of the needle head,
    characterised in that both the needle head and the tongue are produced by metal injection moulding.
  5. A method according to Claim 4,
    characterised in that the needle head with the cheeks forming the tongue slot is produced by metal injection moulding,
    in that the tongue is produced by metal injection moulding
    and in that the tongue is swivel-mounted in the cheeks by means of a pivot-hole mounting.
  6. A method according to Claim 5,
    characterised in that a pivot rotatably passes through the hole provided in the tongue, is inserted into drill holes in the cheeks and is fixed in said drill holes.
  7. A method according to Claim 5,
    characterised in that pivots are integrally formed on either side of the tongue during injection moulding and rotatably pass through holes in the cheeks.
  8. A method according to Claim 5,
    characterised in that pivots are integrally formed on the inner surface of at least one cheek in the metal injection moulding process and rotatably pass through a hole in the tongue.
  9. A method according to Claim 7 or 8,
    characterised in that the tongue is inserted between the cheeks produced with a widened mutual clearance
    and in that then the distance between the cheeks is reduced to the slot width in order to introduce the pivots into the holes.
  10. A method according to Claim 9,
    characterised in that the cheeks are bent towards each other to reduce the width of the tongue slot.
  11. A method according to Claim 9,
    characterised in that one of the cheeks is designed as a free arm, is connected by just one axial end to the needle head and is bent towards the other cheek to reduce the width of the tongue slot.
  12. A method according to Claim 9,
    characterised in that the tongue slot is open towards the shank, so that both cheeks comprise free ends directed towards the shank,
    and in that the free ends are bent towards the shank to reduce the width of the tongue slot.
  13. A method according to Claim 9,
    characterised in that firstly the tongue is produced by the metal injection moulding process,
    in that the completely sintered tongue is inserted into the tongue slot in the brown compact of the needle head
    and in that the width of the tongue slot is reduced by the loss of material during the sintering of the needle head.
  14. A method according to Claim 5,
    characterised in that the tongue is injected by two-component injection moulding into the needle head so that said tongue is free to move.
EP06009159A 2005-06-16 2006-05-03 Method of manufacturing needles for textile machines Active EP1741502B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005028099A DE102005028099B3 (en) 2005-06-16 2005-06-16 Method for producing needles for textile machines and needles produced thereafter

Publications (2)

Publication Number Publication Date
EP1741502A1 EP1741502A1 (en) 2007-01-10
EP1741502B1 true EP1741502B1 (en) 2009-04-22

Family

ID=36717156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06009159A Active EP1741502B1 (en) 2005-06-16 2006-05-03 Method of manufacturing needles for textile machines

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Country Link
EP (1) EP1741502B1 (en)
CN (1) CN1880533B (en)
AT (1) ATE429297T1 (en)
DE (2) DE102005028099B3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009051612B4 (en) 2009-11-02 2013-06-06 Hugo Kern Und Liebers Gmbh & Co. Kg Platinen- Und Federnfabrik Mesh forming needle
CN103696120A (en) * 2013-12-31 2014-04-02 江苏金铁人自动化科技有限公司 Knitting needle
DE102014002790A1 (en) * 2014-03-19 2015-09-24 Mark André Pfeffer Hybrid material components machine knitting needle
DE102015010016A1 (en) 2015-11-10 2017-05-11 Mark Pfeffer Mesh forming needle
EP3483319B1 (en) 2017-11-09 2021-12-22 Groz-Beckert KG Textile tool with indicator film
CN110586943A (en) * 2019-07-24 2019-12-20 嘉善日茸精密工业有限公司 Method for manufacturing groove needle of warp knitting machine

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19232C (en) * A. HAASE in Hohenstein Method of manufacturing latch needles
GB229204A (en) * 1924-08-12 1925-02-19 Christian Speidel Latch needle with interchangeable latch for knitting machines and the like
GB394631A (en) * 1933-03-06 1933-06-29 Agula Sa Latch needle for knitting machines
BE791247A (en) * 1972-05-26 1973-03-01 Singer Co VALVE NEEDLE
US3783647A (en) * 1972-06-29 1974-01-08 Torrington Co Knitting machine needle
JPS6044415B2 (en) * 1978-08-23 1985-10-03 ブラザー工業株式会社 Needles for textile machinery
DE3807499A1 (en) * 1988-03-08 1989-09-21 Franz Martin Arndt Diamond-coated sewing-machine needle tip
DE3810481A1 (en) * 1988-03-26 1989-10-05 Franz Martin Arndt Hard-metal sewing-machine needle
DE8905134U1 (en) * 1989-04-24 1989-06-15 Max Rhodius GmbH + Co. Weissenburger Metallstrickerei KG, 8832 Weissenburg Knitting needle for making wire knits
JP3497566B2 (en) * 1994-06-24 2004-02-16 オリンパス株式会社 Manufacturing method of metal powder sintered parts
DE19644166C1 (en) * 1996-10-24 1997-11-20 Groz Beckert Kg Process for manufacturing durable machine knitting needles etc.
US6119489A (en) * 1998-08-31 2000-09-19 Hna Holdings, Inc. Knitting machine parts resistant to abrasion by yarn of cut-resistant fiber
EP1194605A1 (en) * 1999-06-24 2002-04-10 Basf Aktiengesellschaft Nickel-poor austenitic steel
US6461563B1 (en) * 2000-12-11 2002-10-08 Advanced Materials Technologies Pte. Ltd. Method to form multi-material components

Also Published As

Publication number Publication date
DE102005028099B3 (en) 2007-03-15
CN1880533A (en) 2006-12-20
ATE429297T1 (en) 2009-05-15
CN1880533B (en) 2011-01-26
DE502006003517D1 (en) 2009-06-04
EP1741502A1 (en) 2007-01-10

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