Title of Invention

TEXTILE MACHINERY PART WITH EMBEDDED SOLID LUBRICANT

Abstract The present invention relates to a textile machinery part on which at least the area subjected to wear or at least the surface is being provided with a matrix of metal-phosphor or metal boron or alloy metal, characterised in that as solid lubricant a soft nitride is embedded in the matrix whereby the nitride is softer than the matrix. PRICE: THIRTY RUPEES
Full Text It is known to improve the emergency running features (behaviour at dry condition) of heavily stressed parts by the use of solid lubricants, for example disclosed in the following publications
-JP-OS 5-179522
-JP-OSGM- 4-92567
-US-PS- 5,086.615
-JP-OS- 2-182926
-JP-OSGM- 5-777
- essay NI-P-BN Dispersion Coating for Cylinder from the
publications of „PR7\XIS-FORUM" (authors, amongst others
Suzuki Motor Company, Limited).
Solid lubricants as described in the above mentioned publications are only to a certain extent suitable for textile machinery parts, as is stated with the preamble of the independent claim. The known solid lubricants such as for instance Teflon, molybdenum-disulphide etc. cannot resist high mechanical or thermal stress, which is one of the reasons for the negative experience that has been made with solid lubricants up to now.
It is the task of the present invention to improve highly stressed parts of textile machines in such a way, that emergency running features (behaviour at dry condition) are obtained that lie above today's known degree. In particular a

solid lubricant is to be defined, which owns a high temperature resistance.
The task is solved by the object of the independent claim. The depending claims relate to preferred further embodiments.
According to the invention on a textile machinery part, which, on its surface consists, either completely or only partly, of metal-phosphor and/or metal-boron, a solid lubricant in the form of a soft nitride is added to the metal-phosphor-matrix or to the metal-boron-matrix, whereby the nitride is softer than the matrix. The strength of the matrix can be increased considerably through suitable heat treatment. The increase in hardness is achieved by means of the formation of ceramic separation within a metallic matrix. Said matrix is therefore, in the following called a metal-ceramic-matrix. A hard nitride, for instance a cubic boron-nitride, known from the Japanese application disclosure 4-194031 and 2-182927 would not be suitable as a solid lubricant, could, however, be added to reinforce the matrix. The solid lubricant can be embedded as a dispersion into the metal-ceramic-matrix. In case of coating of the part, consisting of any kind of material, the part is being immersed into a bath. The part can partially or completely be sintered, for that reason the matrix, preferably consisting of steel alloy and the solid lubricant, in their initial state should be available in powder form, before it is being formed. As a soft nitride, which is used for the solid lubricant, for instance hexagonal boron-nitride or chromium-nitride or aluminium-nitride or iron-nitride is applied. If the surface of a part is to be coated, preferably a thickness of the layer of 5 to 100 mm is aimed at. As metals nickel, cobalt, iron or combinations of said metals can be considered, iron, however, is preferred. Besides the solid lubricant, reinforcing for instance fine ceramic grain, silicon carbide in particular can also be contained in the metal-ceramic-matrix. As carrier material for the metal-ceramic-matrix to be coated with the nitride, any kind of materials can be chosen, for instance

alloys of aluminium, magnesium, zinc alloys or plastics, which can be reinforced with filling materials, preferably fibres. The base material of the textile machinery part can be formed by processes of machining, reforming or through moulding. Phosphor and boron are preferably added by 1 to 15 %, 0,5 to 5 % respectively as part of the composition of the metal-ceramic-matrix. Therefore, for the composition part of the phosphor, the boron respectively with 1 to 15 %, 0.5 to 5 % respectively, a respective greater range is specified, since, depending on the terminological main stress such as abrasion, triboxidation, erosion or fatigue, a certain percentage of the phosphor or boron within the specified range listed is optimal.
Parts according to the above description are preferably manufactured as spinning rings or travelers for rotor spinning frames, rotors, rotor shafts, rotor covers or opening rollers of a rotor spinning frame or nozzles and rollers to guide fibres or yarns. Non lubricated sleeve bearings can also be manufactured of materials according to the invention.
As indicated before, instead of applying a coating to a part, the entire part can be manufactured from an alloyed metal-matrix (steel) with the solid lubricant. Powder metallurgy processes that could be applicable are described in the Japanese patent application JP-OS-4-241125 or JP-OS-63-35832.

Accordingly the present invention provides A textile machinery part on which at least the area subjected to wear or at least the surface consists of a matrix of metal-phosphor and/or metal-boron or alloy metal, such as steel, characterized in that a solid lubricant in the form of a soft nitride which is softer than the matrix, is embedded in the matrix, and the surface of the part consists, either completely or partly, of the matrix with the lubricant; or the part is completely or partially sintered, whereby the matrix and the solid lubricant is available in powder form in their initial state before the part is formed.
Preferably a nitride is used as solid lubricant with a grain size between 0.1 and 2 in particular. In order to obtain the effectiveness for the nitride as a solid lubricant, its hardness has to be determined in such a way that when the nitride becomes exposed due to operational stress, said nitride can become effective as stress-reducing lubricant, whereby the stress-reducing effect is aimed to be similar effective for the matrix as well as for the counter part. Preferably the nitride transforms into a protective lubricating film on the matrix, on the counter part body respectively when it becomes exposed to the surface.


WE CLAIM:
1. A textile machinery part on which at least the area subjected to wear or at least the surface consists of a matrix of metal-phosphor and/or metal-boron or alloy metal, such as steel, characterized in that a solid lubricant in the form of a soft nitride which is softer than the matrix, is embedded in the matrix, and the surface of the part consists, either completely or partly, of the matrix with the lubricant or the part is completely or partially sintered, whereby the matrix and the solid lubricant is available in powder form in their initial state before the part is formed.
2. The textile machinery part as claimed in claim 1, wherein the solid lubricant is embedded in the matrix as dispersion.
3. The textile machinery part as claimed in claim 1 or 2, wherein the matrix and the solid lubricant are sintered together.
4. The textile machinery part as claimed in any one of the preceding claims, wherein the nitride consist of hexagonal boron-nitride or chromium-nitride or aluminium nitride or iron nitride.
5. The textile machinery part as claimed in any one of the preceding claims, wherein on the surface a matrix layer is provided, which is applied on the base material.
6. The textile machinery part as claimed in claim 1 or 2, wherein as a metal nickel, cobalt or iron, combinations of said metals respectively, i.e. nickel-cobalt, cobalt-iron, nickel-iron or nickel-cobalt-iron are applied.

7. The textile machinery part as claimed in any one of the preceding claims, wherein a reinforcement of the layer is provided by means of ceramic and/or metallic dispersion.
8. The textile machinery part as claimed in claim 7, wherein within the matrix layer hard fine-ceramic grain, preferably silicon-carbide is being embedded.
9. The textile machinery part as claimed in any one of the preceding claims, wherein the basic material of the part consists of an aluminium or magnesium or zinc alloy or of a plastic with or without filling materials, fibres respectively.
10. The textile machinery part as claimed in claims 1 to 4 and 6 to 8 consisting of steel with the solid lubricant.
11. The textile machinery part as claimed in any one of the preceding claims, wherein within the matrix the part of the phosphorous is 1 to 15% and/or boron is 0.5 to 5%.
12. The textile machinery part as claimed in any one of the preceding claims, wherein said part is a spinning ring or a traveller of a ring spinning frame.

13. The textile machinery part as claimed in any one of the
preceding claims 1 to 11, wherein said part is a rotor, a rotor shaft, a rotor
cover or an opening roller of a rotor spinning frame.
14. The textile machinery part as claimed in any one of the
preceding claims, wherein the part is a nozzle or a drum or a fibre guiding
element.
15. The textile machinery part as claimed in any one of the
preceding claims, wherein the nitride is of a hardness between 50 to 1000
HV.
16. The textile machinery part as claimed in any of the preceding
claims, wherein the grain size of the nitride is between 0.1 and 5jxm.
17. Textile machinery part substantially as herein described.

Documents:

610-mas-1996 abstract.pdf

610-mas-1996 claims.pdf

610-mas-1996 correspondence others.pdf

610-mas-1996 correspondence po.pdf

610-mas-1996 description (complete).pdf

610-mas-1996 form-1.pdf

610-mas-1996 form-26.pdf

610-mas-1996 form-4.pdf

610-mas-1996 petition.pdf


Patent Number 194093
Indian Patent Application Number 610/MAS/1996
PG Journal Number 30/2009
Publication Date 24-Jul-2009
Grant Date
Date of Filing 11-Apr-1996
Name of Patentee MASCHINENFABRIK RIETER AG
Applicant Address KLOSTERTRASSE 20, CH-8406 WINTERTHUR,
Inventors:
# Inventor's Name Inventor's Address
1 DR. FUNK WILHELM BRUCKENSTRASSE 50, CH-8280 KREUZLINGEN,
PCT International Classification Number D06B23/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA