EP1318218B1 - Saw-toothed wire - Google Patents

Saw-toothed wire Download PDF

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Publication number
EP1318218B1
EP1318218B1 EP03000810A EP03000810A EP1318218B1 EP 1318218 B1 EP1318218 B1 EP 1318218B1 EP 03000810 A EP03000810 A EP 03000810A EP 03000810 A EP03000810 A EP 03000810A EP 1318218 B1 EP1318218 B1 EP 1318218B1
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EP
European Patent Office
Prior art keywords
tooth
saw
foot
blade
less
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EP03000810A
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German (de)
French (fr)
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EP1318218A1 (en
Inventor
Ralph A. Graf
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Graf und Cie AG
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Graf und Cie AG
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Priority to DE59911815T priority Critical patent/DE59911815D1/en
Priority to ES03000810T priority patent/ES2236626T3/en
Publication of EP1318218A1 publication Critical patent/EP1318218A1/en
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01GPRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/84Card clothing; Manufacture thereof not otherwise provided for
    • D01G15/88Card clothing; Manufacture thereof not otherwise provided for formed from metal sheets or strips
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/929Tool or tool with support
    • Y10T83/9319Toothed blade or tooth therefor

Definitions

  • the invention relates to a sawtooth wire for producing a sawtooth all-steel set for the drum of a card according to the preamble of patent claim 1.
  • the card In fiber processing, the card is used to parallelize the individual fibers of a used raw material consisting of disordered fibers. This is indicated by the card usually a circular cylindrical spool and a number of over the peripheral surface of the drum distributed on top flat bars.
  • the card usually a circular cylindrical spool and a number of over the peripheral surface of the drum distributed on top flat bars.
  • the spool and the flat bars usually with by sawtooth wires equipped with all-steel sets, between which the parallelization proposal takes place.
  • the sawtooth full steel set of the spool is usually in shape a circular cylindrical surface of the spool helically encircling sawtooth wire formed while the sawtooth all-steel set the lid by side by side arranged sawtooth wire strips may be formed. With such cards More than 120 kg of raw material per hour can be processed or parallelized.
  • GB 2 322 640 A discloses a sawtooth wire for the feed roller Fiber processing device specified with a particularly low tooth incision depth.
  • DE-OS 2 222 918 a card clothing from a 0.3 - 2.0 Wt% carbon, 0.05-2.5 wt% silicon, 0.05-2.0 wt% manganese and 0.01-2.0 wt% Wt .-% vanadium-containing alloy, wherein the vanadium by 0.01 - 3.5 wt.% Tungsten can be replaced.
  • this object is achieved by the in the characterizing part of claim 1 specified development of the known sawtooth wires of the beginning described type consisting of a 0.40 - 0.60 wt.% Manganese and 0.60 - 0.70 wt .-% Consist of tungsten-containing alloy.
  • the invention is based on the knowledge that during operation of the Known cards observed wear of the drum sets primarily on the the captured between the blade sections of the individual coil of the clothing fibers attributable to the blade edges forces.
  • the width of Garniturgassen between the individual Spiraling the Tamlaubarnitur increased in relation to the sheet width, so as to solve the in To facilitate this Garniturgassen embedded fibers and the stress of the To reduce leaf edges through these fibers.
  • Further development of the known sawtooth wires of the free space between the Foot shoulder and the tooth tip increased, so that the fiber material has more space and easier to be removed from this space again.
  • the wear resistance of the sawtooth wire according to the invention Increasing increase in the space between the foot and the tooth tip becomes while ensuring a satisfactory carding result through use corresponding saw teeth allows when the ratio of the blade height to Tooth incision depth more than 1.5, preferably more than 1.8, more preferably about 2 is, which allow for the production of a satisfactory carding result
  • Saw teeth required tooth incision depth may be about 0.4 mm.
  • the ratio of Blade height to the tooth incision depth expediently to at most 3.5, preferably limited to 2.5.
  • the ratio of Blade height to the total height of the wire greater than 0.3, preferably greater than 0.4, more preferably about 0.45 but less than 0.6, preferably less than 0.5.
  • the total height of the Wire less than 2.0 mm, preferably about 1.8 mm, the foot height less than 1.4 mm, preferably about 1.0 mm.
  • Ratio of the blade height to the total height of the wire can in particular also a Good wear resistance can be ensured because by adjusting one in proportion to the overall height of sufficiently large blade height also a wear resistance increasing, particularly large clearance between the tooth tips and the foot shoulder ensured becomes.
  • the sawtooth wire according to the invention consists of alloyed steel.
  • This alloyed Steel contains 0.4 to 0.6 wt .-% manganese and may additionally 0.3 to 2.0, preferably 0.8 to 0.85% by weight of carbon, 0.1 to 2.0, preferably 0.15 to 0.2% vanadium, and / or 0.1 to 2.0, preferably 0.4 to 0.6 wt .-% chromium, wherein the proportions of phosphorus, sulfur, nickel and copper are kept minimal.
  • the proportion of phosphorus is expediently to less than 0.025 wt .-% and the sulfur content to less than 0.25 wt .-% limited.
  • the life of a using a inventive Sawtooth wire produced garnish be increased if the pitch error, i.e. the deviation from the nominal distance between the tooth tips in succession Teeth less than 2%, preferably less than 1.0%, because then at the correct Garniturmontlage leading to a first wear control or first-time Equalize is no longer necessary.
  • the minimization of the division error can be achieved in that during wire production, in particular during the Punching a high-precision wire feed is used, via a rule compensation calculator is controlled.
  • a corresponding sampling method for example a laser scanning method, can possibly occurring pitch errors during the Production to be detected and corrected immediately.
  • the individual teeth of the sawtooth wire according to the invention formed in the form of curved teeth with an arcuate tooth face are, wherein the radius of curvature of the tooth face suitably about 0.15 to 0.25 mm, more preferably about 0.19 mm.
  • This can be a gentle handle in the too parallelizing fiber material can be ensured when the tooth face towards the tooth tip in a rectilinear portion whose length is preferably in Range from 0.02 to 0.2 mm.
  • the sawtooth wire 10 shown in the drawing consists essentially of a foot portion 20 and a blade portion 30.
  • the foot portion 20 at its side facing away from the blade section 30 from a substantially flat lower Limiting surface 24 bounded by the two a right angle enclosing it Flank surfaces 26 and 28 go out and towards the blade portion 30th extend.
  • the foot section starts from the flank surface 26 via a foot shoulder 22 in the sheet section 30, which is provided with a number of teeth 32.
  • teeth 32 there are the teeth 32 by starting from the foot portion 20 facing away from the edge the blade portion 30 in the direction of the foot portion 20 extending tooth incisions 34 are formed.
  • the tooth pitch p i. Distance between the tooth tips of successive teeth is constant and amounts about 1.669 mm.
  • the flank surface 38 of the sheet portion 30 coplanar to the flank surface 28 of the foot portion 20 is formed, wherein the width of the blade portion starting from the tooth tips 32 in the direction of the Foot section 20 steadily increases.
  • the width b1 of the blade section is in the range of the tooth tips about 0.05 mm, while the width b2 of the blade portion 30 at the foot 20th is about 0.24 mm, with the width b4 at the intermediate point of the lowest Tooth incision is about 0.15 mm.
  • the width b3 of the foot section is above its entire height approximately constant and is in the embodiment shown in the drawing of the invention 0.4 mm.
  • the radius of curvature r is 0.19 mm.
  • Towards the Tooth tip 32 c runs the curved portion 32 a of the tooth face of the teeth 32 in one rectilinear extending portion 32b. Through this straight-line section a gentle engagement of the teeth is made possible in the fiber material.
  • the teeth 32 of the sawtooth wire shown in the drawing have in the region of their tips 32c in the stretched state, a breast angle ⁇ of 40 °.
  • the angle ⁇ between the approximately rectilinear tooth back and a perpendicular to the lower boundary surface 24th of the wire 10 extending line is 65 °, so that there is a wedge angle of 25 °.
  • the invention is not based on the illustrated with reference to the drawing embodiment limited. Rather, it is also due to the use of sawtooth wires with other dimensions thought. Furthermore, in the context of this invention also sawtooth wires with variable tooth pitch p are used. Incidentally, according to the invention also to the use Sawtooth wires with lockable foot sections thought.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

Card clothing wire has a tapered blade section (30) joined at a shoulder (22) on one side to a thicker base section (20). The thickness (b3) of the base section is greater than 2, preferably 2.6 times the thickness (b4) of the blade section measured at the lowest part of the teeth. The preferred thickness dimensions of the other parts of the wire are also specified. An independent claim is also included, preferably for a wire if this type, having a teeth height (h5) greater than 0.3 times, preferably 0.45 times, the height (h1) of the wire. The preferred other height dimensions are also specified.

Description

Die Erfindung betrifft einen Sägezahndraht zur Herstellung einer Sägezahn-Ganzstahlgarnitur für den Tambour einer Karde nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a sawtooth wire for producing a sawtooth all-steel set for the drum of a card according to the preamble of patent claim 1.

Bei der Faserverarbeitung wird die Karde zur Parallelisierung der Einzelfasern eines aus ungeordneten Fasern bestehenden Rohmaterials eingesetzt. Dazu weist die Karde üblicherweise einen kreiszylinderförmigen Tambour und eine Anzahl von über die Umfangsfläche des Tambours verteilten Deckelstäben auf. Zum Zweck der Parallelisierung sind sowohl der Tambour als auch die Deckelstäbe üblicherweise mit durch Sägezahndrähte gebildeten Ganzstahlgarnituren ausgestattet, zwischen denen der Parallelisierungsvorschlag stattfindet. Dabei ist die Sägezahn-Ganzstahlgarnitur des Tambours üblicherweise in Form eines die Kreiszylindermantelfläche des Tambours wendelförmig umlaufenden Sägezahndrahtes gebildet, während die Sägezahn-Ganzstahlgarnitur der Deckel durch nebeneinander angeordnete Sägezahndrahtstreifen gebildet sein kann. Mit derartigen Karden können mehr als 120 kg Rohmaterial pro Stunde verarbeitet bzw. parallelisiert werden. Dabei kann eine zufriedenstellende Kardierleistung sichergestellt werden, wenn für den Tambour der Karde Sägezahn-Ganzstahlgarnituren nach der EP 0 360 961 B2 eingesetzt werden. Es hat sich jedoch gezeigt, daß diese bekannten Sägezahn-Ganzstahlgarnituren während des Betriebs insbesondere bei den vorstehend erwähnten hohen Produktionsleistungen einem starken Verschleiß unterliegen.In fiber processing, the card is used to parallelize the individual fibers of a used raw material consisting of disordered fibers. This is indicated by the card usually a circular cylindrical spool and a number of over the peripheral surface of the drum distributed on top flat bars. For the purpose of parallelization are both the spool and the flat bars usually with by sawtooth wires equipped with all-steel sets, between which the parallelization proposal takes place. The sawtooth full steel set of the spool is usually in shape a circular cylindrical surface of the spool helically encircling sawtooth wire formed while the sawtooth all-steel set the lid by side by side arranged sawtooth wire strips may be formed. With such cards More than 120 kg of raw material per hour can be processed or parallelized. there Satisfactory carding performance can be ensured if for the reel the card sawtooth all-steel sets are used according to EP 0 360 961 B2. It However, it has been found that these known sawtooth all-steel sets during the Operation especially at the above-mentioned high production rates subject to heavy wear.

In der CH 660 884 A5 ist das Problem des starken Verschleisses von Kardengarnituren bereits angesprochen. Zur Lösung dieses Problems wird in der genannten Schrift der Einsatz besonderer Stahllegierungen zur Herstellung dieser Kardengarnituren vorgeschlagen. Dabei ist jedoch bereits das weitere Problem angesprochen, daß besonders verschleißfeste Stahllegierungen auch besonders teuer sind, so daß im Zusammenhang mit Kardengarnituren das Preis-Leistungsoptimum nicht bei der maximalen Verschleißfestigkeit liegt, sondern bei der Wahl eines Garniturmaterials liegt, bei der die Zunahme der Verschleißfestigkeit nicht durch die erhöhten Material- und Herstellungskosten wieder wettgemacht werden. Daher sind auch bei Einsatz der in der genannten schweizerischen Patentschrift beschriebenen legierten Stähle zur Herstellung von Kardengarnituren der in der EP 0 360 961 B2 beschriebenen Art noch die beschriebenen Probleme hinsichtlich der Verschleißfestigkeit zu beobachten.In the CH 660 884 A5 the problem of heavy wear of card clothing is already addressed. To solve this problem is mentioned in the document proposed the use of special steel alloys for the production of these card clothing. However, the other problem is already addressed, especially wear-resistant steel alloys are also particularly expensive, so that in connection with Cartridge sets the price-performance optimum not at the maximum wear resistance but lies in the choice of a clothing material in which the increase in wear resistance not offset by the increased material and manufacturing costs become. Therefore, even with the use of the mentioned in the Swiss Patent described alloyed steels for the production of card clothing in the EP 0 360 961 B2 described still the problems described in terms of Wear resistance to watch.

Ferner ist in der GB 2 322 640 A ein Sägezahndraht für die Zuführwalze einer Faserverarbeitungsvorrichtung mit einer besonders geringen Zahneinschnittiefe angegeben.Furthermore, GB 2 322 640 A discloses a sawtooth wire for the feed roller Fiber processing device specified with a particularly low tooth incision depth.

Darüber hinaus ist in der DE-OS 2 222 918 eine Kardengarnitur aus einer 0,3 - 2,0 Gew.-% Kohlenstoff, 0.05 - 2,5 Gewl-% Silicium, 0.05 - 2.0 Gew.-% Mangan und 0.01 - 2.0 Gew.-% Gew.-% Vanadium enthaltenden Legierung angegeben, wobei das Vanadium durch 0.01 - 3.5 Gew.% Wolfram ersetzt werden kann.In addition, in DE-OS 2 222 918 a card clothing from a 0.3 - 2.0 Wt% carbon, 0.05-2.5 wt% silicon, 0.05-2.0 wt% manganese and 0.01-2.0 wt% Wt .-% vanadium-containing alloy, wherein the vanadium by 0.01 - 3.5 wt.% Tungsten can be replaced.

Angesichts der vorstehend erläuterten Probleme im Stand der Technik liegt dieser Erfindung die Aufgabe zugrunde, einen Sägezahndraht zur Herstellung einer Sägezahn-Ganzstahlgarnitur für den Tambour einer Karde bereitzustellen, der unter Vermeidung übermäßiger Materialkosten und Sicherstellung einer zufriedenstellenden Kardierleistung eine hohe Verschleißfestigkeit während des Kardierbetriebes aufweist.In view of the above-described problems in the prior art, this is Invention, the task of a sawtooth wire for producing a sawtooth all-steel set to provide for the tambour of a card, under avoidance Excessive material costs and ensuring satisfactory carding performance has a high wear resistance during Kardierbetriebes.

Erfindungsgemäß wird diese Aufgabe durch die im kennzeichnenden Teil des Anspruchs 1 angegebene Weiterbildung der bekannten Sägezahndrähte der eingangs beschriebenen Art gelöst, die aus einer 0.40 - 0.60 Gew.% Mangan und 0.60 - 0.70 Gew.-% Wolfram aufweisenden Legierung bestehen. According to the invention, this object is achieved by the in the characterizing part of claim 1 specified development of the known sawtooth wires of the beginning described type consisting of a 0.40 - 0.60 wt.% Manganese and 0.60 - 0.70 wt .-% Consist of tungsten-containing alloy.

Die Erfindung geht auf die Erkenntnis zurück, daß der während des Betriebs der bekannten Karden beobachtete Verschleiß der Tambourgarnituren in erster Linie auf die von den zwischen den Blattabschnitten der einzelnen Wendel der Garnitur festgehaltenen Fasern auf die Blattflanken ausgeübten Kräfte zurückzuführen ist. Mit der erfindungsgemäßen Weiterbildung der Sägezahndrähte wird die Breite der Garniturgassen zwischen den einzelnen Wendeln der Tambourgarnitur im Verhältnis zur Blattbreite erhöht, um so das Lösen der in diesen Garniturgassen eingelagerten Fasern zu erleichtern und die Beanspruchung der Blattflanken durch diese Fasern zu reduzieren. Mit andern Worten wird durch die erfindungsgemäße Weiterbildung der bekannten Sägezahndrähte der Freiraum zwischen der Fußschulter und der Zahnspitze vergrößert, so daß das Fasermaterial mehr Platz hat und einfacher wieder aus diesem Freiraum entfernt werden kann. Das ist im besonderen bei hohen Produktionsleistungen und/oder bei der Verarbeitung von Langstapelbaumwolle im Hinblick auf den Erhalt einer hohen Verschleißfestigkeit von besonderer Bedeutung., Es hat sich gezeigt, daß durch diese Weiterbildung mit nur einer Tambourgarnitur ohne nennenswerten Verschleiß Durchsatzmengen von 1000 t und mehr erzielt werden können.The invention is based on the knowledge that during operation of the Known cards observed wear of the drum sets primarily on the the captured between the blade sections of the individual coil of the clothing fibers attributable to the blade edges forces. With the development of the invention the sawtooth wires, the width of Garniturgassen between the individual Spiraling the Tambourgarnitur increased in relation to the sheet width, so as to solve the in To facilitate this Garniturgassen embedded fibers and the stress of the To reduce leaf edges through these fibers. In other words, by the invention Further development of the known sawtooth wires of the free space between the Foot shoulder and the tooth tip increased, so that the fiber material has more space and easier to be removed from this space again. That is in particular with high production rates and / or processing of long staple cotton in the In view of obtaining a high wear resistance of particular importance., It has It has been shown that by this training with only one Tambourgarnitur without Significant wear throughputs of 1000 t and more can be achieved.

Dabei hat es sich bei Einsatz erfindungsgemäßer Sägezahndrähte zur Herstellung einer Sägezahn-Ganzstahlgarnitur für den Tambour einer Karde überraschenderweise gezeigt, daß die dadurch erreichte Verbreiterung der Garniturgassen im Verhältnis zur Breite der Blattabschnitte keinen nennenswerten Einfluß auf die Kardierleistung, d.h. den Grad der durch den Kardiervorgang erzielten Parallelisierung hat. Es hat sich jedoch herausgestellt, daß besonders gute Kardierergebnisse erzielt werden können, wenn das Verhältnis der Fußbreite zur Blattbreite an der Stelle des tiefsten Zahneinschnittes kleiner als 3,5 vorzugsweise kleiner als 3 ist. Bei Verwendung erfindungsgemäßer Garnituren kann der gewünschte große Freiraum zwischen der Fußschulter und der Zahnspitze unter Vermeidung einer zu geringen Stabilität des Blattabschnittes bei gleichzeitiger Sicherstellung eines besonders guten Kardierergebnisses verwirklicht werden, wenn die Blattbreite ausgehend von dem dem Fußabschnitt abgewandten Rand des Blattabschnittes in Richtung auf den Fußabschnitt zumindest abschnittweise stetig zunimmt und das Verhältnis der Fußbreite zur Blattbreite am Fuß größer als 1,4, vorzugsweise etwa 1,6 ist. In diesem Zusammenhang hat es sich als besonders zweckmäßig erwiesen, wenn die Fußbreite etwa 0,2 bis 0,6 mm, vorzugsweise etwa 0,4 mm beträgt, die Blattbreite an dem dem Fußabschnitt abgewandten Rand des Blattabschnittes etwa 0,02 bis 0,2 mm, vorzugsweise etwa 0,5 mm beträgt und die Blattbreite am Fuß etwa 0,2 bis 0,3 mm, vorzugsweise etwa 0,24 mm beträgt.It has when using inventive sawtooth wires for the production a sawtooth all-steel set for the tambour of a card surprisingly shown that the broadening of the Garniturgassen achieved thereby in relation to the width the blade sections do not significantly affect carding performance, i. the degree of has achieved by the carding parallelization. However, it has turned out that particularly good carding results can be achieved if the ratio of Foot width to leaf width at the point of the deepest tooth incision smaller than 3.5 preferably less than 3. When using inventive sets of the desired large clearance between the foot and the tooth tip below Avoidance of insufficient stability of the blade section while securing a particularly good carding result can be realized if the sheet width starting from the edge of the blade section facing away from the foot section in the direction on the foot section at least in sections, steadily increasing and the ratio of Foot width to the leaf width at the foot is greater than 1.4, preferably about 1.6. In this Context, it has proved to be particularly useful when the foot width is about 0.2 to 0.6 mm, preferably about 0.4 mm, the sheet width at the foot portion remote edge of the blade portion about 0.02 to 0.2 mm, preferably about 0.5 mm is and the leaf width at the foot about 0.2 to 0.3 mm, preferably about 0.24 mm is.

Eine weitere, die Verschleißfestigkeit des erfindungsgemäßen Sägezahndrahtes vergrößernde Erhöhung des Freiraumes zwischen der Fußschulter und der Zahnspitze wird bei gleichzeitiger Sicherstellung eines zufriedenstellenden Kardierergebnisses durch Verwendung entsprechender Sägezähne ermöglicht, wenn das Verhältnis der Blatthöhe zur Zahneinschnittiefe mehr als 1,5, vorzugsweise mehr als 1,8, besonders bevorzugt etwa 2 beträgt, wobei die zur Herstellung von ein zufriedenstellendes Kardierergebnis ermöglichenden Sägezähnen benötigte Zahneinschnittiefe etwa 0,4 mm betragen kann. Another, the wear resistance of the sawtooth wire according to the invention Increasing increase in the space between the foot and the tooth tip becomes while ensuring a satisfactory carding result through use corresponding saw teeth allows when the ratio of the blade height to Tooth incision depth more than 1.5, preferably more than 1.8, more preferably about 2 is, which allow for the production of a satisfactory carding result Saw teeth required tooth incision depth may be about 0.4 mm.

Dabei ist jedoch darauf zu achten, daß der vergrößerte Freiraum zwischen Fußschulter und Zahnspitze erfindungsgemäßer Sägezahndrähte auch zu einer Erhöhung des während des Kardiervorganges durch das Rotieren des Tambours mitgeführten Luftvolumens führt, welches wiederum das Kardierergebnis beeinflussen kann. Zur Vermeidung eines übermäßigen Freiraums zwischen Fußschulter und Zahnspitze wird das Verhältnis der Blatthöhe zur Zahneinschnittiefe zweckmäßigerweise auf höchstens 3,5, vorzugsweise höchstens 2,5 begrenzt.However, it is important to ensure that the increased space between Foot shoulder and tooth tip inventive sawtooth wires also to an increase of the air volume entrained during the carding process by the rotation of the main cylinder leads, which in turn can influence the carding result. To avoid Excessive clearance between foot and toe becomes the ratio of Blade height to the tooth incision depth expediently to at most 3.5, preferably limited to 2.5.

Im Hinblick auf die Vermeidung übermäßiger Materialkosten unter gleichzeitiger Sicherstellung eines mit einer hinreichenden Stabilität auf den Tambour der Karde aufziehbaren Sägezahndrahtes hat es sich als vorteilhaft erwiesen, wenn das Verhältnis der Blatthöhe zur Gesamthöhe des Drahtes größer als 0,3, vorzugsweise größer als 0,4, besonders bevorzugt etwa 0,45, jedoch kleiner als 0,6, vorzugswiese kleiner als 0,5 ist. In diesem Zusammenhang hat es sich weiter als günstig erwiesen, wenn die Gesamthöhe des Drahtes weniger als 2,0 mm, vorzugsweise etwa 1,8 mm beträgt, wobei die Fußhöhe weniger als 1,4 mm, vorzugsweise etwa 1,0 mm betragen kann. Durch die richtige Wahl des Verhältnisses der Blatthöhe zur Gesamthöhe des Drahtes kann im besonderen auch eine gute Verschleißfestigkeit sichergestellt werden, weil durch die Einstellung einer im Verhältnis zur Gesamthöhe hinreichend großen Blatthöhe auch ein die Verschleißfestigkeit erhöhender, besonders großer Freiraum zwischen den Zahnspitzen und der Fußschulter sichergestellt wird.With regard to avoiding excessive material costs while at the same time Ensuring one with a sufficient stability on the tambour of the carding wind-up Sawtooth wire, it has proved to be advantageous if the ratio of Blade height to the total height of the wire greater than 0.3, preferably greater than 0.4, more preferably about 0.45 but less than 0.6, preferably less than 0.5. In In this context, it has further proven to be favorable if the total height of the Wire less than 2.0 mm, preferably about 1.8 mm, the foot height less than 1.4 mm, preferably about 1.0 mm. By the right choice of Ratio of the blade height to the total height of the wire can in particular also a Good wear resistance can be ensured because by adjusting one in proportion to the overall height of sufficiently large blade height also a wear resistance increasing, particularly large clearance between the tooth tips and the foot shoulder ensured becomes.

Der erfindungsgemäße Sägezahndraht besteht aus legiertem Stahl. Dieser legierte Stahl enthält 0,4 bis 0,6 Gew.-% Mangan und kann zusätzlich 0,3 bis 2,0, vorzugsweise 0,8 bis 0,85 Gew.-% Kohlenstoff, 0,1 bis 2,0, vorzugsweise 0,15 bis 0,2 % Vanadium, und/oder 0,1 bis 2,0, vorzugsweise 0,4 bis 0,6 Gew.-% Chrom aufweisen, wobei die Anteile von Phosphor, Schwefel, Nickel und Kupfer minimal gehalten sind. Dabei wird der Phosphoranteil zweckmäßigerweise auf weniger als 0,025 Gew.-% und der Schwefelanteil auf weniger als 0,25 Gew.-% beschränkt.The sawtooth wire according to the invention consists of alloyed steel. This alloyed Steel contains 0.4 to 0.6 wt .-% manganese and may additionally 0.3 to 2.0, preferably 0.8 to 0.85% by weight of carbon, 0.1 to 2.0, preferably 0.15 to 0.2% vanadium, and / or 0.1 to 2.0, preferably 0.4 to 0.6 wt .-% chromium, wherein the proportions of phosphorus, sulfur, nickel and copper are kept minimal. The proportion of phosphorus is expediently to less than 0.025 wt .-% and the sulfur content to less than 0.25 wt .-% limited.

Im Hinblick auf den Erhalt einer hohen Verschleißfestigkeit hat es sich weiter als zweckmäßig erwiesen, wenn die Rauhigkeit an den Seitenflanken des Blattabschnittes zumindest im Bereich der Zähne weniger als 5 µm, vorzugsweise weniger als 4 µm beträgt, weil eine übermäßige Rauhigkeit zu einer erhöhten Reibung und damit auch zu einem erhöhten Verschleiß führt. Diese geringe Rauhigkeit kann erreicht werden, wenn die Sägezahndrähte nach einem Stanz- und Härteprozeß einem gesonderten Arbeitsgang zum Erhalt der gewünschten Oberflächeneigenschaften unterzogen werden. Dabei hat es sich als besonders zweckmäßig herausgestellt, wenn die Sägezahndrähte in diesem gesonderten Arbeitsgang in einer Entgratungs- und Polieranlage einem galvanischen Polierprozeß unterzogen werden.In order to obtain a high wear resistance, it has continued to be proven useful when the roughness on the side edges of the blade section at least in the area of the teeth is less than 5 μm, preferably less than 4 μm, because excessive roughness leads to increased friction and therefore also to a increased wear leads. This low roughness can be achieved when the Sawtooth wires after a punching and hardening process a separate operation for Receiving the desired surface properties are subjected. It has turned out to be particularly expedient if the sawtooth wires in this separate Operation in a deburring and polishing plant subjected to a galvanic polishing process become.

Darüber hinaus kann die Standzeit einer unter Verwendung eines erfindungsgemäßen Sägezahndrahtes hergestellten Garnitur erhöht werden, wenn der Teilungsfehler, d.h. die Abweichung vom Sollabstand zwischen den Zahnspitzen aufeinanderfolgender Zähne weniger als 2 %, vorzugsweise weniger als 1,0 % beträgt, weil dann bei korrekter Garniturmontage ein zu einem ersten Verschleiß führender Kontrollschliff oder ein erstmaliges Egalisieren nicht mehr notwendig ist. Die Minimalisierung der Teilungsfehler kann dadurch erreicht werden, daß während der Drahtherstellung, insbesondere während des Stanzvorgangs ein Hochpräzisionsdrahtvorschub benutzt wird, der über einen Regel-Kompensationsrechner gesteuert wird. Durch ein entsprechendes Abtastverfahren, beispielsweise ein Laser-Abtastverfahren, können evtl. auftretende Teilungsfehler während der Herstellung sofort erfaßt und korrigiert werden.In addition, the life of a using a inventive Sawtooth wire produced garnish be increased if the pitch error, i.e. the deviation from the nominal distance between the tooth tips in succession Teeth less than 2%, preferably less than 1.0%, because then at the correct Garniturmontlage leading to a first wear control or first-time Equalize is no longer necessary. The minimization of the division error can be achieved in that during wire production, in particular during the Punching a high-precision wire feed is used, via a rule compensation calculator is controlled. By a corresponding sampling method, for example a laser scanning method, can possibly occurring pitch errors during the Production to be detected and corrected immediately.

Weiter hat es sich zum Erhalt einer hohen Verschleißfestigkeit als besonders zweckmäßig erwiesen, wenn die einzelnen Zähne des erfindungsgemäßen Sägezahndrahtes in Form von Bogenzähnen mit einer bogenförmig verlaufenden Zahnbrust gebildet sind, wobei der Krümmungsradius der Zahnbrust zweckmäßigerweise etwa 0,15 bis 0,25 mm, besonders bevorzugt etwa 0,19 mm beträgt. Dabei kann ein schonender Griff in das zu parallelisierende Fasermaterial sichergestellt werden, wenn die Zahnbrust in Richtung auf die Zahnspitze in einen geradlinig verlaufenden Abschnitt, dessen Länge vorzugsweise im Bereich von 0,02 bis 0,2 mm liegt.Furthermore, it has to maintain high wear resistance as special proven useful when the individual teeth of the sawtooth wire according to the invention formed in the form of curved teeth with an arcuate tooth face are, wherein the radius of curvature of the tooth face suitably about 0.15 to 0.25 mm, more preferably about 0.19 mm. This can be a gentle handle in the too parallelizing fiber material can be ensured when the tooth face towards the tooth tip in a rectilinear portion whose length is preferably in Range from 0.02 to 0.2 mm.

Nachstehend wird die Erfindung unter Bezugnahme auf die Zeichnung, auf die hinsichtlich aller erfindungswesentlichen und in der Beschreibung nicht näher herausgestellten Einzelheiten ausdrücklich verwiesen wird erläutert. In der Zeichnung zeigt:

Fig. 1
eine Seitenansicht eines erfindungsgemäßen Sägezahndrahtes,
Fig. 2
eine Schnittansicht durch den in Fig. 1 dargestellten Sägezahndraht und
Fig. 3
eine Detaildarstellung eines Sägezahnes des in Fig. 1 dargestellten Sägezahndrahtes.
In the following, the invention will be explained with reference to the drawing, to which reference is expressly made with respect to all details essential to the invention and details which are not further detailed in the description. In the drawing shows:
Fig. 1
a side view of a sawtooth wire according to the invention,
Fig. 2
a sectional view through the sawtooth wire shown in Fig. 1 and
Fig. 3
a detailed representation of a sawtooth of the sawtooth wire shown in Fig. 1.

Der in der Zeichnung dargestellte Sägezahndraht 10 besteht im wesentlichen aus einem Fußabschnitt 20 und einem Blattabschnitt 30. Dabei wird der Fußabschnitt 20 an seiner dem Blattabschnitt 30 abgewandten Seite von einer im wesentlichen ebenen unteren Begrenzungsfläche 24 begrenzt, von der zwei einen rechten Winkel damit einschließende Flankenflächen 26 und 28 ausgehen und sich in Richtung auf den Blattabschnitt 30 erstrecken. Durch diese Form des Fußabschnittes wird erreicht, daß der in der Zeichnung dargestellte Sägezahndraht auf einen Tambour mit glatter Walzenoberfläche aufgezogen werden kann, wobei der dann wendelförmig umlaufende Sägezahndraht so angeordnet ist, daß die Flankenflächen der Fußabschnitte aufeinanderfolgender Wendel aneinander anliegen.The sawtooth wire 10 shown in the drawing consists essentially of a foot portion 20 and a blade portion 30. In this case, the foot portion 20 at its side facing away from the blade section 30 from a substantially flat lower Limiting surface 24 bounded by the two a right angle enclosing it Flank surfaces 26 and 28 go out and towards the blade portion 30th extend. By this shape of the foot section is achieved that in the drawing shown sawtooth wire wound on a spool with smooth roll surface can be, with the then helically encircling sawtooth wire is arranged so that the flank surfaces of the foot portions of successive coil abut each other.

Der Fußabschnitt geht ausgehend von der Flankenfläche 26 über eine Fußschulter 22 in den Blattabschnitt 30 über, der mit einer Anzahl von Zähnen 32 versehen ist. Dabei sind die Zähne 32 durch sich ausgehend von dem dem Fußabschnitt 20 abgewandten Rand des Blattabschnittes 30 in Richtung auf den Fußabschnitt 20 erstreckenden Zahneinschnitten 34 gebildet sind. Bei der in der Zeichnung dargestellten Ausführungsform ist die Zahnteilung p, d.h. Abstand zwischen den Zahnspitzen aufeinanderfolgender Zähne konstant und beträgt etwa 1,669 mm. Wie besonders deutlich in Fig. 2 zu erkennen ist, ist die Flankenfläche 38 des Blattabschnitts 30 coplanar zur Flankenfläche 28 des Fußabschnittes 20 gebildet, wobei die Breite des Blattabschnittes ausgehend von den Zahnspitzen 32 in Richtung auf den Fußabschnitt 20 stetig zunimmt. Dabei beträgt die Breite b1 des Blattabschnittes im Bereich der Zahnspitzen etwa 0,05 mm, während die Breite b2 des Blattabschnittes 30 am Fuß 20 etwa 0,24 mm beträgt, wobei die Breite b4 an der dazwischenliegenden Stelle des tiefsten Zahneinschnitts etwa 0,15 mm beträgt. Die Breite b3 des Fußabschnittes ist über dessen gesamte Höhe etwa konstant und beträgt bei der in der Zeichnung dargestellten Ausführungsform der Erfindung 0,4 mm.The foot section starts from the flank surface 26 via a foot shoulder 22 in the sheet section 30, which is provided with a number of teeth 32. there are the teeth 32 by starting from the foot portion 20 facing away from the edge the blade portion 30 in the direction of the foot portion 20 extending tooth incisions 34 are formed. In the embodiment shown in the drawing, the tooth pitch p, i. Distance between the tooth tips of successive teeth is constant and amounts about 1.669 mm. As can be seen particularly clearly in FIG. 2, the flank surface 38 of the sheet portion 30 coplanar to the flank surface 28 of the foot portion 20 is formed, wherein the width of the blade portion starting from the tooth tips 32 in the direction of the Foot section 20 steadily increases. In this case, the width b1 of the blade section is in the range of the tooth tips about 0.05 mm, while the width b2 of the blade portion 30 at the foot 20th is about 0.24 mm, with the width b4 at the intermediate point of the lowest Tooth incision is about 0.15 mm. The width b3 of the foot section is above its entire height approximately constant and is in the embodiment shown in the drawing of the invention 0.4 mm.

Bei der in der Zeichnung dargestellten Ausführungsform der Erfindung beträgt die Gesamthöhe des Sägezahndrahtes h1 1,8 mm, die Höhe h2 des Fußabschnittes 1,0 mm, die Zahneinschnittiefe h4 0,4 mm und die Höhe h5 des Blattabschnittes 0,8 mm.In the embodiment of the invention shown in the drawing which is Total height of the sawtooth wire h1 1.8 mm, the height h2 of the foot section 1.0 mm, the Tooth incision depth h4 0.4 mm and the height h5 of the leaf section 0.8 mm.

Wie besonders deutlich in Fig. 3 dargestellt, sind die einzelnen Zähne 32 in Form von Bogenzähnen mit einer in Richtung auf die Zahnspitze 32c nach vorne gebogenen Krümmung gebildet. Dabei beträgt der Krümmungsradius r 0,19 mm. In Richtung auf die Zahnspitze 32c läuft der gekrümmte Abschnitt 32a der Zahnbrust der Zähne 32 in einem geradlinigen verlaufenden Abschnitt 32b aus. Durch diesen geradlinig verlaufenden Abschnitt wird ein schonender Eingriff der Zähne in das Fasermaterial ermöglicht. Die Zähne 32 des in der Zeichnung dargestellten Sägezahndrahtes weisen im Bereich ihrer Spitzen 32c in gestrecktem Zustand einen Brustwinkel α von 40° auf. Der Winkel β zwischen dem etwa geradlinig verlaufenden Zahnrücken und einer senkrecht zur unteren Begrenzungsfläche 24 des Drahtes 10 verlaufenden Geraden beträgt 65°, so daß sich ein Keilwinkel von 25° ergibt. Durch die erläuterte Abstimmung der Fußbreite b3 auf die Blattbreite b2 am Fuß, die Blattbreite b4 an der Stelle des tiefsten Zahneinschnitts und die Blattbreite b1 an der Zahnspitze wird bei einer aus dem in der Zeichnung dargestellten Sägezahndraht hergestellten Garnitur ein besonders großer Freiraum zwischen der Fußschulter 22 und der Zahnspitze 32c sichergestellt, mit dem unter Sicherstellung einer guten Kardierwirkung auch dann eine hohe Verschleißfestigkeit erreicht werden kann, wenn der Sägezahndraht aus einer vergleichsweise preisgünstigen Stahlleierung der eingangs beschriebenen Art hergestellt ist.As shown particularly clearly in Fig. 3, the individual teeth 32 in the form of Curved teeth with a curved toward the tooth tip 32c forward curvature educated. The radius of curvature r is 0.19 mm. Towards the Tooth tip 32 c runs the curved portion 32 a of the tooth face of the teeth 32 in one rectilinear extending portion 32b. Through this straight-line section a gentle engagement of the teeth is made possible in the fiber material. The teeth 32 of the sawtooth wire shown in the drawing have in the region of their tips 32c in the stretched state, a breast angle α of 40 °. The angle β between the approximately rectilinear tooth back and a perpendicular to the lower boundary surface 24th of the wire 10 extending line is 65 °, so that there is a wedge angle of 25 °. By the explained vote of the foot width b3 on the sheet width b2 on the foot, the Leaf width b4 at the location of the deepest tooth incision and the leaf width b1 at the Tooth tip is at one of the sawtooth wire shown in the drawing garnish a particularly large space between the foot 22 and the shoulder Tooth tip 32c ensured, with that while ensuring a good carding effect too then a high wear resistance can be achieved when the sawtooth wire off a comparatively inexpensive steel lining of the type described above produced is.

Die Erfindung ist nicht auf das anhand der Zeichnung erläuterte Ausführungsbeispiel beschränkt. Vielmehr ist auch an den Einsatz von Sägezahndrähten mit anderen Abmessungen gedacht. Ferner können im Rahmen dieser Erfindung auch Sägezahndrähte mit variabler Zahnteilung p eingesetzt werden. Im übrigen ist auch an den Einsatz erfindungsgemäßer Sägezahndrähte mit verriegelbaren Fußabschnitten gedacht.The invention is not based on the illustrated with reference to the drawing embodiment limited. Rather, it is also due to the use of sawtooth wires with other dimensions thought. Furthermore, in the context of this invention also sawtooth wires with variable tooth pitch p are used. Incidentally, according to the invention also to the use Sawtooth wires with lockable foot sections thought.

Claims (13)

  1. A saw-tooth wire for the manufacture of a saw-tooth all-steel clothing for the drum of a carding machine, comprising a foot portion (20) and a blade portion (30) adjoining the said foot portion via a foot shoulder (22), the blade portion (30) having saw-teeth (32) formed by tooth indentations (34) starting from the margin of the blade portion (30) remote from the foot portion (20), in which the ratio of the foot width (b3) to the blade width (b4) at the point of the deepest tooth indentation is greater than 2, characterised in that the ratio of the foot width (b2) to the blade width (b4) at the point of the deepest tooth indentation is less than 3.5, and the saw-tooth wire is composed of alloyed steel which contains 0.40 - 0.60 wt. % manganese and 0.60 to 0.70 wt. % tungsten.
  2. A saw-tooth wire according to Claim 1 or 2, characterised in that the blade width starting from the margin of the blade portion (30) remote from the foot portion (20) at least steadily increases towards the foot portion (20), and the ratio of the foot width (b3) to the blade width (b2) at the foot is greater than 1.4.
  3. A saw-tooth wire according to one of the preceding claims, characterised in that the foot width (b3) is about 0.2 to 0.6 mm.
  4. A saw-tooth wire according to one of the preceding claims, characterised in that the blade width (b1) at the margin of the blade portion (30) remote from the foot portion (20) is about 0.02 to 0.2 mm.
  5. A saw-tooth wire according to one of the preceding claims, characterised in that the ratio of the blade height (h5) to the tooth indentation depth (h4) is greater than 1.5.
  6. A saw-tooth wire according to Claim 5, characterised in that the ratio of the blade height (h5) to the tooth indentation depth (h4) is less than 3.5.
  7. A saw-tooth wire according to one of the preceding claims, characterised in that the ratio of the blade height (h5) to the overall height (h1) of the wire (10) is greater than 0.3.
  8. A saw-tooth wire according to Claim 7, characterised in that the ratio of the blade height (h4) to the overall height (h1) of the wire (10) is less than 0.6.
  9. A saw-tooth wire according to one of the preceding claims, characterised in that the overall height (h1) of the wire is less than 2.0 mm.
  10. A saw-tooth wire according to one of the preceding claims, characterised in that the foot height (h2) is less than 1.4 mm.
  11. A saw-tooth wire according to one of the preceding claims, characterised in that the alloyed steel contains 0.80 to 0.85 wt. % carbon and/or 0.15 to 0.20 wt. % vanadium and/or less than 0.02 wt. % phosphorus and less than 0.02 wt. % sulphur.
  12. A saw-tooth wire according to one of the preceding claims, characterised in that the roughness on the side flanks (38) of the blade portion (30) at least in the region of the teeth (32) is less than 5 µm.
  13. A saw-tooth wire according to one of the preceding claims, characterised in that the pitch error, i.e. the deviation away from the nominal spacing between the tooth tips (32c) of successive teeth (32), is less than 2%, preferably less than 1%.
EP03000810A 1999-11-10 1999-11-10 Saw-toothed wire Expired - Lifetime EP1318218B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59911815T DE59911815D1 (en) 1999-11-10 1999-11-10 sawtooth
ES03000810T ES2236626T3 (en) 1999-11-10 1999-11-10 SIERRA TEETH WIRE.

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EP1099783A1 (en) 2001-05-16
JP2001162440A (en) 2001-06-19
TR200003334A3 (en) 2001-06-21
US20030116006A1 (en) 2003-06-26
DE59906445D1 (en) 2003-09-04
EP1318218A1 (en) 2003-06-11
ES2236626T3 (en) 2005-07-16
CA2325508A1 (en) 2001-05-10
ATE291652T1 (en) 2005-04-15
ES2200455T3 (en) 2004-03-01
ATE246272T1 (en) 2003-08-15
TR200003334A2 (en) 2001-06-21
DE29924404U1 (en) 2003-02-06
EP1099783B1 (en) 2003-07-30
BR0005315A (en) 2001-06-12
TW522183B (en) 2003-03-01
DE59911815D1 (en) 2005-04-28
MXPA00011036A (en) 2003-04-25

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