WO2005021851A1 - Coated rapier - Google Patents

Coated rapier Download PDF

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Publication number
WO2005021851A1
WO2005021851A1 PCT/EP2004/051998 EP2004051998W WO2005021851A1 WO 2005021851 A1 WO2005021851 A1 WO 2005021851A1 EP 2004051998 W EP2004051998 W EP 2004051998W WO 2005021851 A1 WO2005021851 A1 WO 2005021851A1
Authority
WO
WIPO (PCT)
Prior art keywords
rapier
coating
coated
metal based
hard metal
Prior art date
Application number
PCT/EP2004/051998
Other languages
French (fr)
Inventor
Peter Osselaer
Marc Sercu
Wim Pappaert
Filip Van Damme
Original Assignee
Nv Bekaert Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nv Bekaert Sa filed Critical Nv Bekaert Sa
Publication of WO2005021851A1 publication Critical patent/WO2005021851A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20—Constructional features of the thread-engaging device on the inserters

Definitions

  • the invention relates to a rapier coated with a hard metal based coating and to a method of manufacturing such a coated rapier.
  • a rapier In a weaving machine, a rapier is used for the picking of a thread across the width of the weaving machine. The portions of the rapier coming into sliding contact with the treads suffer from frictional abrasion by the threads.
  • a rapier coated at least partially with a hard metal based coating is provided.
  • the hard metal based coating has a hardness higher than 1000 Vickers. More preferably, the hard metal based coating has a hardness higher than
  • Hard metal based coatings comprise for example metal carbides, metal nitrides and metal oxides, such as tungsten carbide, titanium carbide, chrome nitride, aluminium oxide, chrome oxide, ...
  • Hard metal based coating according to the invention can be deposited by any technique known in the art. However, the hard metal based coating is preferably deposited by thermal spraying. Thermal sprayed coatings are characterised by a surface roughness Ra between 2 and 5 ⁇ m.
  • the term Ra is defined as the arithmetical mean deviation of the profile.
  • the hard metal based coating preferably has a thickness ranging between 10 and 500 ⁇ m. More preferably, the hard metal based coating has a thickness between 30 and 200 ⁇ m, as for example 100 ⁇ m.
  • the hard metal based coating is further coated with a hard carbon coating on top of the hard metal based coating.
  • Preferred hard carbon coatings comprise diamond-like coatings.
  • Diamond-like coating are amorphous carbon based coatings with a high hardness and a low coefficient of friction. Their unique composition and structure results in excellent wear resistance and non-sticking characteristics.
  • Diamond-like coatings comprise for example diamond-like carbon (DLC) coatings and diamond-like nanocomposite (DLN) coatings or layered structures of diamond-like carbon (DLC) and diamond-like nanocomposite (DLN) coatings.
  • DLC diamond-like carbon
  • DLN diamond-like nanocomposite
  • Diamond-like coating comprise for example diamond-like carbon (DLC) coatings and diamond-like nanocomposite (DLN) coatings.
  • DLC diamond-like carbon
  • DLN diamond-like nanocomposite
  • Diamond-like carbon coatings comprise amorphous hydrogenated carbon coatings (a-C:H); whereas diamond-like nanocomposite coatings comprise interpenetrating networks of a-C:H and a-Si:0.
  • a representative DLN coating comprises 30 to 70 at% C, 20 to 40 at% H, 5 to 15 at% Si and 5 to 15 % O.
  • DLN coatings exhibit a very low coefficient of friction, even in high humidity or wet environment.
  • the DLC or DLN coating can further be doped with a transition metal.
  • a transition metal In particular W, Zr Ti, Nb and Ta are well suited as doping elements.
  • the DLC or DLN coating can further contain an inert gas such as Ne, Ar or Kr, for example in an amount of 0.5 to 5 at%.
  • a method of manufacturing a rapier is provided.
  • the method comprises the steps of
  • the substrate is preferably pretreated by any technique known in the art as for example by grit blasting, grinding, milling, polishing or by a combination of these techniques.
  • a preferred method further comprises the step of
  • the hard carbon coating such as a DLC or DLN coating is preferably applied by chemical vapour deposition.
  • This pretreatment may comprise for example grit blasting, grinding, milling, polishing or a combination of these techniques.
  • a method to reduce the number of yarn ruptures during weaving is provided.
  • the number of yarn ruptures is decreased by using a rapier as described above. Brief description of the drawings.
  • Figure 1 is a coated rapier according to the present invention.
  • a rapier 10 according to the present invention is shown in figure 1.
  • the surface of the rapier 12 susceptible to wear due to the contact with the treads or yarn of the weaving machine of the rapier is coated with a thermal sprayed coating WC coating.
  • the rapier Before the application of the thermal sprayed coating, the rapier is pretreated by milling and polishing the surface to be coated.
  • a DLN coating is applied by chemical vapour deposition.
  • the WC coating has a thickness of 100 ⁇ m and a hardness of 1400
  • the WC coating has a roughness Ra of 4 ⁇ m.
  • the rapier Before the application of the DLN coating the rapier may be subjected to a milling an polishing operation until a surface roughness of 0.4 or 0.1 ⁇ m.
  • the life-time of a coated rapier according to the present invention is compared with the life-time of a rapiers known in the art such as rapiers coated with a hard chrome coating or rapiers coated with a polymer coating. It has been shown that the life-time of a rapier according to the present invention is at least 2 till 3 times longer than the life-time of the rapiers known in the art.

Abstract

The invention relates to a rapier coated at least partially with a hard metal based coating, said coating having a hardness higher than 1000 Vickers. Possibly, the rapier is further coated with a hard carbon coating on top of this hard metal based coating. The invention further relates to a method of manufacturing a coated rapier.

Description

Coated rapier.
Field of the invention.
The invention relates to a rapier coated with a hard metal based coating and to a method of manufacturing such a coated rapier.
Background of the invention.
In a weaving machine, a rapier is used for the picking of a thread across the width of the weaving machine. The portions of the rapier coming into sliding contact with the treads suffer from frictional abrasion by the threads.
Summary of the invention.
It is an object of the present invention to provide a rapier with a high wear resistance and an improved durability.
According to a first aspect of the present invention, a rapier coated at least partially with a hard metal based coating is provided. The hard metal based coating has a hardness higher than 1000 Vickers. More preferably, the hard metal based coating has a hardness higher than
1200 Vickers or higher than 1400 Vickers.
Hard metal based coatings comprise for example metal carbides, metal nitrides and metal oxides, such as tungsten carbide, titanium carbide, chrome nitride, aluminium oxide, chrome oxide, ...
Hard metal based coating according to the invention can be deposited by any technique known in the art. However, the hard metal based coating is preferably deposited by thermal spraying. Thermal sprayed coatings are characterised by a surface roughness Ra between 2 and 5 μm.
The term Ra is defined as the arithmetical mean deviation of the profile. The hard metal based coating preferably has a thickness ranging between 10 and 500 μm. More preferably, the hard metal based coating has a thickness between 30 and 200 μm, as for example 100 μm.
In a preferred embodiment the hard metal based coating is further coated with a hard carbon coating on top of the hard metal based coating.
Preferred hard carbon coatings comprise diamond-like coatings. Diamond-like coating are amorphous carbon based coatings with a high hardness and a low coefficient of friction. Their unique composition and structure results in excellent wear resistance and non-sticking characteristics.
Diamond-like coatings comprise for example diamond-like carbon (DLC) coatings and diamond-like nanocomposite (DLN) coatings or layered structures of diamond-like carbon (DLC) and diamond-like nanocomposite (DLN) coatings.
Diamond-like coating comprise for example diamond-like carbon (DLC) coatings and diamond-like nanocomposite (DLN) coatings.
Diamond-like carbon coatings comprise amorphous hydrogenated carbon coatings (a-C:H); whereas diamond-like nanocomposite coatings comprise interpenetrating networks of a-C:H and a-Si:0. A representative DLN coating comprises 30 to 70 at% C, 20 to 40 at% H, 5 to 15 at% Si and 5 to 15 % O.
DLN coatings exhibit a very low coefficient of friction, even in high humidity or wet environment.
To influence its conductivity, the DLC or DLN coating can further be doped with a transition metal. In particular W, Zr Ti, Nb and Ta are well suited as doping elements. The DLC or DLN coating can further contain an inert gas such as Ne, Ar or Kr, for example in an amount of 0.5 to 5 at%.
According to a second aspect of the present invention, a method of manufacturing a rapier is provided.
The method comprises the steps of
- providing a rapier;
- applying a hard metal based coating by thermal spraying.
To obtain a good adhesion, before the application of the hard metal based coating, the substrate is preferably pretreated by any technique known in the art as for example by grit blasting, grinding, milling, polishing or by a combination of these techniques.
A preferred method further comprises the step of
- applying a hard carbon coating.
The hard carbon coating such as a DLC or DLN coating is preferably applied by chemical vapour deposition.
It can be preferred to pretreat the rapier coated with the hard metal based coating before the application of the hard carbon coating.
This pretreatment may comprise for example grit blasting, grinding, milling, polishing or a combination of these techniques.
According to a third aspect of the invention a method to reduce the number of yarn ruptures during weaving is provided. The number of yarn ruptures is decreased by using a rapier as described above. Brief description of the drawings.
The invention will now be described into more detail with reference to the accompanying drawings wherein - Figure 1 is a coated rapier according to the present invention.
Description of the preferred embodiments of the invention.
A rapier 10 according to the present invention is shown in figure 1.
The surface of the rapier 12 susceptible to wear due to the contact with the treads or yarn of the weaving machine of the rapier is coated with a thermal sprayed coating WC coating.
Before the application of the thermal sprayed coating, the rapier is pretreated by milling and polishing the surface to be coated.
In a next step a DLN coating is applied by chemical vapour deposition.
The WC coating has a thickness of 100 μm and a hardness of 1400
Vickers.
The WC coating has a roughness Ra of 4 μm.
Before the application of the DLN coating the rapier may be subjected to a milling an polishing operation until a surface roughness of 0.4 or 0.1 μm.
Wear on the rapier is strongly reduced because of the high wear resistance of the thermal sprayed hard metal based coating. The low friction properties of the DLN coating reduce the number of yarn ruptures.
The life-time of a coated rapier according to the present invention is compared with the life-time of a rapiers known in the art such as rapiers coated with a hard chrome coating or rapiers coated with a polymer coating. It has been shown that the life-time of a rapier according to the present invention is at least 2 till 3 times longer than the life-time of the rapiers known in the art.

Claims

1. A rapier coated at least partially with a hard metal based coating, said coating having a hardness higher than 1000 Vickers.
2. A rapier according to claim 1 , whereby said hard metal based coating is deposited by thermal spraying.
3. A rapier according to claim 1 or 2, whereby said hard metal based coating has a surface roughness Ra between 2 and 5 μm.
4. A rapier according to any one of the preceding claims, whereby said rapier is further coated with a hard carbon coating on top of said hard metal based coating.
5. A rapier according to any one of the preceding claims, whereby said hard carbon coating comprises a diamond-like carbon coating.
6. A rapier according to any one of claims 1 to 4, whereby said hard carbon coating comprises a diamond-like nanocomposite coating.
7. A method of manufacturing a coated rapier, said method comprising the steps of providing a rapier; applying a hard metal based coating by thermal spraying.
8. A method according to claim 6, further comprising the step of - applying a hard carbon coating.
9. A method according to claim 8, whereby said hard carbon coating is applied by chemical vapour deposition.
10. A method to reduce the number of yarn ruptures during weaving by using a rapier as claimed in claim 1 to 6.
PCT/EP2004/051998 2003-09-03 2004-09-02 Coated rapier WO2005021851A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03103277.4 2003-09-03
EP03103277 2003-09-03

Publications (1)

Publication Number Publication Date
WO2005021851A1 true WO2005021851A1 (en) 2005-03-10

Family

ID=34259242

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/051998 WO2005021851A1 (en) 2003-09-03 2004-09-02 Coated rapier

Country Status (1)

Country Link
WO (1) WO2005021851A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7273655B2 (en) 1999-04-09 2007-09-25 Shojiro Miyake Slidably movable member and method of producing same
US7650976B2 (en) 2003-08-22 2010-01-26 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor
US7771821B2 (en) 2003-08-21 2010-08-10 Nissan Motor Co., Ltd. Low-friction sliding member and low-friction sliding mechanism using same
US8096205B2 (en) 2003-07-31 2012-01-17 Nissan Motor Co., Ltd. Gear
US8152377B2 (en) 2002-11-06 2012-04-10 Nissan Motor Co., Ltd. Low-friction sliding mechanism
US8206035B2 (en) 2003-08-06 2012-06-26 Nissan Motor Co., Ltd. Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US8575076B2 (en) 2003-08-08 2013-11-05 Nissan Motor Co., Ltd. Sliding member and production process thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4757844A (en) * 1987-05-05 1988-07-19 Vamatex S.P.A. Weft grippers for shuttleless weaving looms
US4822662A (en) * 1985-04-17 1989-04-18 Kabushiki Kaisha Toshiba Machine parts with wear-resistant surface brought into contact with elongated fibrous member
EP0550752A1 (en) * 1990-09-28 1993-07-14 Citizen Watch Co. Ltd. Reed for high speed loom
WO1999029943A1 (en) * 1997-12-11 1999-06-17 Picanol N.V. Gripper for a mechanical loom
US6230759B1 (en) * 1997-04-02 2001-05-15 Picanol N.V. Gripper weaving machine with ribbed guide porton connected to rapier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4822662A (en) * 1985-04-17 1989-04-18 Kabushiki Kaisha Toshiba Machine parts with wear-resistant surface brought into contact with elongated fibrous member
US4757844A (en) * 1987-05-05 1988-07-19 Vamatex S.P.A. Weft grippers for shuttleless weaving looms
EP0550752A1 (en) * 1990-09-28 1993-07-14 Citizen Watch Co. Ltd. Reed for high speed loom
US6230759B1 (en) * 1997-04-02 2001-05-15 Picanol N.V. Gripper weaving machine with ribbed guide porton connected to rapier
WO1999029943A1 (en) * 1997-12-11 1999-06-17 Picanol N.V. Gripper for a mechanical loom

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7273655B2 (en) 1999-04-09 2007-09-25 Shojiro Miyake Slidably movable member and method of producing same
US8152377B2 (en) 2002-11-06 2012-04-10 Nissan Motor Co., Ltd. Low-friction sliding mechanism
US8096205B2 (en) 2003-07-31 2012-01-17 Nissan Motor Co., Ltd. Gear
US8206035B2 (en) 2003-08-06 2012-06-26 Nissan Motor Co., Ltd. Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US8575076B2 (en) 2003-08-08 2013-11-05 Nissan Motor Co., Ltd. Sliding member and production process thereof
US7771821B2 (en) 2003-08-21 2010-08-10 Nissan Motor Co., Ltd. Low-friction sliding member and low-friction sliding mechanism using same
US7650976B2 (en) 2003-08-22 2010-01-26 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor

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