Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H7/00—Spinning or twisting arrangements
  • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
  • D01H7/52—Ring-and-traveller arrangements
  • D01H7/60—Rings or travellers; Manufacture thereof not otherwise provided for ; Cleaning means for rings
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H7/00—Spinning or twisting arrangements
  • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
  • D01H7/52—Ring-and-traveller arrangements
  • D01H7/60—Rings or travellers; Manufacture thereof not otherwise provided for ; Cleaning means for rings
  • D01H7/604—Travellers

Definitions

• the invention relates to a method for producing a ring traveler for ring spinning or ring twisting machines and to a ring traveler according to claims 1 and 7.
• Ring travelers of ring spinning and ring twisting machines are moved at high speed (30m / s to 50m / s) on rings of the corresponding ring spinning or ring twisting machines. Both the contact area between the ring traveler and the ring and the contact area between the ring traveler and the thread are subject to high wear. To increase production, however, increasingly higher running speeds of the ring rotors are required. By achieving longer service lives, the costs are to be reduced at the same time.
• Coating the 'ring traveler with appropriate materials has significantly improved its running and operating properties in recent years. However, the wear resistance at the thread passage has not yet been improved.
• the object of the present invention is therefore to create a ring traveler for ring spinning or ring twisting machines which on the one hand has further improved running and operating properties and on the other hand can be produced with reduced effort.
• a method for producing this ring traveler must also be specified. This object is achieved with a method and a ring traveler which have the features specified in claims 1 and 7, respectively.
• a ring traveler according to the invention has an uncoated core made of iron material which, at least in the area of the running surfaces with which it slides on a ring of a ring spinning or ring twisting machine or in which the thread is guided, has an optionally multi-part nitrided edge layer.
• the core is at least partially subjected to a nitriding treatment during which thermal energy and a nitrating agent are supplied as the active medium.
• embrittlement treatment can lead to embrittlement and a considerable reduction in the elasticity of the treated material.
• the composition of the nitrating agent according to the invention By controlling the composition of the nitrating agent according to the invention and appropriately selected treatment time, the elasticity of the ring traveler can be obtained, which is necessary in order to be able to place it on spinning rings without deformation.
• the core is heated to a temperature in the range from 450.degree. C. to 600.degree. C., preferably to a temperature close to 550.degree. C., and kept in the temperature range mentioned for 3 to 60 hours, preferably for about 24 hours.
• the nitrating agent can be supplied in the form of a gas, a liquid or a plasma, preferably consisting of NH 3 and N 2 parts. Areas in which no nitriding treatment should take place are covered, for example.
• the nitrided edge layer of the ring rotor core consists of a connection layer without additional diffusion layer, from a connection layer with additional radially inner diffusion layer or only from a diffusion layer.
• the connecting layer preferably has a thickness of 0.1 ⁇ m - 30 ⁇ m and the diffusion layer has a thickness of 1 ⁇ m - 2000 ⁇ m.
• the active medium preferably has, in addition to the nitrogen parts, sulfur and / or carbon parts.
• the coefficient of friction can be reduced by adding sulfur and / or carbon parts.
• the thicknesses of the connection layer and the diffusion layer can be adjusted as required.
• connection layer When choosing small thicknesses of the connection layer, there are only slight changes in the roughness of the core surface.
• the surface of the ring traveler is additionally polished before and / or after the nitriding treatment. Ring travelers that are exposed to high chemical stress are preferably re-oxidized.
• the ring travelers according to the invention have significantly improved operating properties, in particular an increased rotor service life and an increased resistance to cutting at the thread passage.
• the functionally very important cutting resistance in the thread passage under mechanical and / or chemical stress has been improved by 50% - 200%, which results in an improvement in the quality of the processed yarn. Due to the increased chemical resistance, yarn soiling due to corrosion products that have previously occurred in the processing of advanced and chlorine-containing fibers is also avoided. Due to the good sliding properties, little or no fiber lubrication is required.
• the ring rotors can also be manufactured with less effort and, if necessary, adapted to existing individual requirements.
• Ring travelers according to the invention can be used both in spinning mills and in twisting mills. Your good running properties, e.g. good sliding and low wear are particularly advantageous in combination with steel rings, but they can also be used on other rings, e.g. can be used on sintered, burnished or coated rings.
• FIGS. 3-5 show the section through the core of ring travelers after processing according to the invention.
• Figures la to lf show ring travelers 10a, ..., lOf in various configurations already described in WO 99/49113.
• La and 1b show C-shaped ring travelers 10a, 10b, as are typically used on T-flange rings of ring spinning or ring twisting machines.
• the figures lc to lf show ear-shaped and hook-shaped ring travelers 10c, ..., lOf.
• the ring travelers 10c and 10d are used on oblique flange rings, the ring travelers 10e on conical flange rings and the ring travelers 10f on vertical flange rings.
• Ring travelers 10 and 10a,... Lof according to the invention can be produced in the configurations shown in FIGS.
• a ring traveler 10 has a core 20 which is made of ferrous material and is not coated and which, at least in area 1 of the running surfaces with which it slides on a ring of a ring spinning or ring twisting machine or in the area in which the thread is guided, a nitrided zone.
• the thread passage lies in the areas of the ring travelers 10a,..., 10f designated by 4.
• the ring traveler 10 is at least partially subjected to a nitriding treatment, during which thermal energy and a nitrating agent are supplied to the core 20 as the active medium.
• a nitriding treatment during which thermal energy and a nitrating agent are supplied to the core 20 as the active medium.
• the ring traveler 10 is preferably polished before the nitriding treatment.
• the base material of the core 20 is preferably an unalloyed or low-alloy steel, preferably a nitriding steel.
• a core 20 is preferably selected from a tempered steel, in which only negligible changes in size occur during the nitriding treatment.
• the base material of the core 20 preferably contains nitride-forming elements such as chromium, vanadium, aluminum, molybdenum, manganese and / or nickel.
• the process parameters such as temperature profile (ramp profile for heating, holding time and holding temperature, ramp profile for cooling) and composition of the nitrating agent influence the result of the nitriding treatment.
• the core is heated in a furnace to a temperature in the range from 450.degree. C. to 600.degree. C., preferably to a temperature close to 550.degree. C. and kept in the stated temperature range for 3 to 60 hours, preferably for about 24 hours.
• the nitrating agent can be supplied in the form of a gas, preferably consisting of NH 3 and N 2 parts, optionally also having H 2 , a liquid or a plasma.
• nitrogen atoms are ionized in an evacuated chamber, after which they are attracted to the oppositely polarized surface 22 of the ring travelers 10 and combine with the iron to form iron nitride
• Ring travelers 10 treated according to the invention preferably have a black, blue, yellow or white glossy surface 22a after the treatment.
• the active medium preferably has, in addition to nitrogen parts, sulfur and / or carbon parts. On the one hand, this can reduce the coefficient of friction and at the same time influence the formation of the nitrided zones.
• the described nitriding treatment forms a possibly multi-part nitrided surface layer in the core 20 of the ring traveler 10, which is explained in more detail with reference to FIGS. 2 to 5.
• FIG. 2 shows a section through the core 20 of an untreated ring traveler 10. It can be seen that there is unchanged base material 21 over the entire core cross section.
• FIG. 3 shows a section through the core 20a of a treated ring rotor 10, which has a thin edge layer consisting of nitrided base material, which is referred to as the connecting layer 23, in which extensive diffusion saturation has occurred.
• FIG. 4 shows a section through the core 20b of an intensively treated ring traveler 10, which has a connecting layer 23 and underneath another layer consisting of nitrided base material, which is referred to as diffusion layer 24.
• the diffusion layer 24 contains nitrogen-enriched mixed crystals and precipitated nitrides.
• FIG. 5 shows a section through the core 20c of a treated ring traveler 10 which has only one diffusion layer 24 and no connecting layer 23.
• a hard connection layer is preferably provided.
• a tougher and nevertheless relatively hard diffusion layer 24 is chosen, while avoiding a connecting layer.
• the connecting layer preferably has a thickness of 0.1 ⁇ m - 30 ⁇ m and the diffusion layer has a thickness of 1 ⁇ m - 2,000 ⁇ m.
• the use of a connecting layer with a thickness of 8 ⁇ m-12 ⁇ m and a diffusion layer with a thickness of 100 ⁇ m-200 ⁇ m is particularly advantageous.
• the choice of a small thickness or the total avoidance of the connection layer can prevent material breaks that have previously made it impossible to use this technology in this area.
• the layer thicknesses resulting from the nitriding treatment are heavily dependent on the steel composition and on the surface condition of the untreated ring travelers 10. Basically, a large connection layer is achieved with a high nitrogen supply and high temperatures and a thin connection layer with a low nitrogen supply and low temperatures. The layer thicknesses or the diffusion depths depend on the treatment duration.
• Fine, light ring travelers 10 are also treated for a shorter duration than coarse, heavy ring travelers 10.
• the coefficient of friction can be reduced by adding sulfur and / or carbon parts.
• the thicknesses of the connection layer and the diffusion layer can be adjusted as required.
• connection layer With the selection of small thicknesses of the connection layer, there are only slight changes in the roughness of the core surface 22a, so that a subsequent polishing of the treads can be avoided. Embrittlement of the core material is also avoided.
• Ring travelers 10 which are exposed to high chemical stress, are preferably post-oxidized.
• an inner side of the ring traveler 10, designated by 3 should be wear-resistant and equipped with good sliding properties, and therefore a nitrided layer 23; 24 have.
• a nitrided layer 23; 24 With appropriate thread tension, it can result that the ring traveler 10 runs laterally tilted along a ring, so that it can prove to be advantageous to also cover the two end faces 2 with a nitrided layer 23; 24 to be provided.
• the nitriding treatment is preferably carried out for the entire ring traveler 10, although it is also possible to provide only the mechanically and / or chemically highly stressed areas with a nitrided edge zone.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
• Saccharide Compounds (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2001
  • 2001-03-26 KR KR1020027000062A patent/KR100687308B1/ko not_active IP Right Cessation
  • 2001-03-26 JP JP2001580468A patent/JP2003531970A/ja active Pending
  • 2001-03-26 BR BRPI0106267-0A patent/BR0106267B1/pt not_active IP Right Cessation
  • 2001-03-26 DE DE50101497T patent/DE50101497D1/de not_active Expired - Lifetime
  • 2001-03-26 PT PT01913454T patent/PT1192303E/pt unknown
  • 2001-03-26 AT AT01913454T patent/ATE259898T1/de not_active IP Right Cessation
  • 2001-03-26 EP EP01913454A patent/EP1192303B1/fr not_active Expired - Lifetime
  • 2001-03-26 ES ES01913454T patent/ES2211776T3/es not_active Expired - Lifetime
  • 2001-03-26 AU AU39083/01A patent/AU3908301A/en not_active Abandoned
  • 2001-03-26 WO PCT/CH2001/000183 patent/WO2001083864A1/fr active IP Right Grant
  • 2001-03-26 US US10/030,065 patent/US6804943B2/en not_active Expired - Fee Related
  • 2001-03-26 MX MXPA01012995A patent/MXPA01012995A/es active IP Right Grant
  • 2001-03-26 CN CNB018011527A patent/CN1252332C/zh not_active Expired - Fee Related
  • 2001-05-01 TW TW090110386A patent/TW526284B/zh active
• 2003
  • 2003-03-21 HK HK03102084.0A patent/HK1049864A1/zh unknown

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