WO2005021851A1 - Coated rapier - Google Patents
Coated rapier Download PDFInfo
- 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
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.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
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.
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)
| 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)
| 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 |
-
2004
- 2004-09-02 WO PCT/EP2004/051998 patent/WO2005021851A1/en active Application Filing
Patent Citations (5)
| 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)
| 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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