EP0020399B1 - Spinnring aus stahl für ringspinn- und ringzwirnmaschinen - Google Patents

Spinnring aus stahl für ringspinn- und ringzwirnmaschinen Download PDF

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Publication number
EP0020399B1
EP0020399B1 EP79901102A EP79901102A EP0020399B1 EP 0020399 B1 EP0020399 B1 EP 0020399B1 EP 79901102 A EP79901102 A EP 79901102A EP 79901102 A EP79901102 A EP 79901102A EP 0020399 B1 EP0020399 B1 EP 0020399B1
Authority
EP
European Patent Office
Prior art keywords
ring
hardened
layer
zone
steel
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP79901102A
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German (de)
English (en)
French (fr)
Other versions
EP0020399A1 (de
Inventor
Gustav STÄHLI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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
Priority to AT79901102T priority Critical patent/ATE3998T1/de
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0020399A1 publication Critical patent/EP0020399A1/de
Application granted granted Critical
Publication of EP0020399B1 publication Critical patent/EP0020399B1/de
Expired legal-status Critical Current

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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
    • D01H7/602—Rings

Definitions

  • the invention relates to a spinning ring made of steel for ring spinning and ring twisting machines with a rotor guide surface, which has a hardened structure and an outer layer with a non-metal diffused into it.
  • a known spinning ring of the aforementioned type (for example US Pat. No. 2,987,871 or US Pat. No. 3,084,501) is subjected to case hardening at 830 ° C. and then sulfurization in a salt bath at approx. 565 ° C. to produce it. whereby a soft, sulfur-containing surface layer with a thickness of 50 ⁇ up to a few tenths of a millimeter is achieved.
  • This is followed by a further case hardening or induction hardening at about 855 ° C in order to restore the hardness lost during the sulfurization. Due to the sulfur introduced, the outer hardened layer has lubricating properties which can reduce the run-in time for the runner.
  • Another known spinning ring made of hardened steel (CH-A-430.522) has an outer, approximately 3-50 .mu.m deep surface layer made of soft, unhardened steel, which is caused by the removal of carbon as a result of annealing during the hardening process and therefore a lack of structural change during the hardening process.
  • This known spinning ring also has the disadvantage that as the soft layer progresses, the rotor gets onto the hardened steel base and e.g. the dimensional accuracy of the ring is also impaired when it is annealed above the structural transformation temperature.
  • the lack of an alloy component extracted during the hardening process does not therefore remedy the disadvantages of a ring made of hardened steel with a non-metal doped in the surface layer.
  • the outer layer thus formed has good anti-friction properties, which are increased by the natural porosity of the layer.
  • the ring in an hardened zone containing the rotor guide surface has an outer, nitrogen-containing, softer inlet layer than the hardened steel with an increasing cross-section inward hardness, and in that the hardened zone locally on a part containing the rotor guide surface of the ring is limited and connects to an unhardened area of the ring.
  • the invention is based on the knowledge that the behavior of nitrogen and its influence on the structure of steel are used to control the structural change in the hardened zone and thus the structure formation in the nitrogen-containing area of the spinning ring and thus in the inlet layer.
  • an outer iron nitride layer enriched by diffusion with nitrogen can be formed, which gives a nitrogen-rich, softer structure containing hardened austenite during hardening. It is thus possible to reverse the known undesirable effects and properties of the non-metallic component nitrogen in the steel structure and those of a hardened structure for a spinning ring by combining them into an advantageous effect.
  • the running-in layer is preferably present with an austenitic-martensitic structure, the austenite content of which decreases in the direction of the hardened steel base to the same extent as the content of the nitrogen which has diffused in, and thus results in the increasing hardness inside.
  • the spinning ring according to the invention is thus protected against adhesive scuffing and the occurrence of welded-on material, as has been the case with the ungreased sliding of two metallic materials onto one another and therefore between a rotor and the previously known spinning rings.
  • a runner guide surface can therefore be created for the runner which, owing to its nitrogen content, has a high feed resistance and does not lead to the notorious welding of the runner and ring.
  • any remaining shape errors in the rotor guide surface due to the softer running-in layer have been eliminated.
  • the running-in layer is quickly smoothed due to its lower hardness in the outer area, so that even at rotor speeds e.g. of more than 30 m / sec there is no risk of seizure in the rotor guide surface.
  • a considerable shortening of the running-in process can be achieved without any appreciable reduction in the normal production speed, because the runner can continuously reach a surface of increasing hardness and thus increasing stability, damage to the runner guide surface such as e.g. by G. Stähli, signs of wear on the treads of high-speed steel spinning rings, causes and formation mechanism, Melliand Textil Symposium Ste 53 (1972), pages 1101 to 1103, are avoided.
  • the non-metallic component nitrogen is introduced into the surface of the ring made of unhardened steel at a temperature below the structural transformation temperature and an outer, nitrogen-rich iron nitride layer is formed
  • the structural transformation temperature is preferably hardened in a locally limited zone which contains the rotor guide surface and remains restricted to the part of the ring which contains the rotor guide surface, as a result of which the finished shape of the ring can be maintained unchanged.
  • the dimensional accuracy of the spinning ring e.g. Roundness and flatness of the same are guaranteed, which is known to always be impaired when the entire ring body is hardened.
  • the partial hardening can be controlled in such a way that e.g. the entire core of a flange cross section is hardened or only a hardened layer is present and a core made of unhardened steel remains in the flange cross section.
  • a spinning ring 1 made of steel, such as can be used for a ring spinning or ring twisting machine, has an annular upper rotor flange 2 with a rotor guide surface 3 for receiving a rotor 4 guiding a thread.
  • a flange 5, which is also annular, is connected to the flange 2 , on which an outwardly angled, annular mounting flange 6 for attaching the spinning ring 1 is formed on a ring bench of the machine, not shown.
  • the spinning ring 1 is made in one piece with the flange 2, the ring web 5 and the limiting flange 6.
  • the spinning ring 1 has an outer layer 7 made of iron nitride on its entire surface in the steel.
  • the spinning ring 1 made of unhardened steel is fully hardened in the entire core 9 of the zone 8, so that in the flange 2 there is a fully hardened structural ring with an outer contour of the flange 2 given rotation surface RF is formed.
  • a transition layer 10 is formed between the iron nitride layer 7 and the hardened steel base in the core 9, ie the hardened structure 9a thereof, with a hardness which is lower than that of the hardened steel base, and which together with the iron nitride layer 7 in the Zone 8 gives a run-in layer 11 for the rotor 4.
  • the hardened zone 8 extends from a flange upper edge 2a beyond the rotor flange 2 to an immediately adjoining area 12 of the ring web 5 at a height of the spinning ring 1 indicated by A, which is less than a total height B of the spinning ring 1. In the area 12 of the ring web 5, the hardened zone connects to an area 13 of the spinning ring 1 made of the uncured steel.
  • the zone height A is preferably chosen to be so large that all areas of the outer surfaces of the spinning ring 1 that come into contact with parts of the rotor, for example also with rotor ends 4a, lie within the hardened zone 8. Between the hardened structure 9a in zone 8 and the remaining area 13, which has an unhardened structure 13a, there is a delimited structure transition 14 which results from the temperature profile or temperature gradient in the steel material during hardening.
  • the spinning ring 1 manufactured with the desired usable dimensions is entirely nitrided in its surface at a temperature which is below the structural transformation temperature of the steel used, preferably at 500-600 ° C, e.g. at 560-580 ° C, the dimensional accuracy of the spinning ring 1 remains guaranteed.
  • Bath nitriding e.g. According to the so-called Tenifer process, also called the tuff ride process, as stated in Durferrit House Bulletins, Issue 35, December 1962, by Degussa, Dept. Durferrit, Frankfurt / Main, or a e.g. short-term gas nitriding takes place, e.g. by G.
  • the iron nitride layer 7 e.g. with about 10-12 weight percent nitrogen.
  • the layer 7 can have a thickness C of up to approx. 50, e.g. 5-10 ⁇ and compared to the hardness of the unhardened steel with e.g. a Vickers hardness of 100-200 HV, a greater hardness, e.g. a Vickers hardness of 400-600 HV can be achieved.
  • a so-called diffusion layer (not shown) can result in the ferrite of the uncured steel.
  • the spinning ring is then in the locally limited zone 8, i.e. only partially, while heating to temperatures above the structural transformation temperature of the steel used, e.g. to 800-900 ° C, and cooling, i.e. Harden, hardened.
  • nitrogen diffuses from the iron nitride layer 7 into the steel base, i.e. into the steel base inwards, which leads to a transition zone corresponding to the transition layer 10 with a falling nitrogen content away from the layer 7 inwards.
  • a transformation of austenite into martensite is inhibited in accordance with the gradient of the nitrogen content in the transition zone and the transition layer 10 is formed with a decreasing content of austenite and an increasing content of martensite.
  • the layer 10 therefore has a lower hardness than the hardened steel base of the core 9 containing austenite-free martensite structure and has e.g. starting from a Vickers hardness of around 700 HV, increasing hardness inwards except for e.g. a Vickers hardness of more than 700 HV, e.g. 900 HV, owning steel base.
  • the spinning ring 1 can be formed in the locally delimited zone 8 in succession with the inlet layer 11 from the remaining iron nitride layer 7 and the adjoining transition layer 10 with increasing hardness and the core 9 made from hardened steel. After hardening, the spinning ring 1 has a fine-porous surface in the hardened zone 8.
  • the spinning ring 1 is therefore preferably mechanically in zone 8, e.g. reworked by grinding or slurry blasting, whereby the running-in layer 11 with the outer iron nitride layer 7 is exposed and smoothed and a low-pore surface, free of processing traces of manufacture and scale, is achieved.
  • the rotor 4 can thus work smoothly in the initially soft iron nitride layer 7 and remove it quickly and then reaches the transition layer 10 to an increasing hardness thereof, thereby preventing damage to the running surface.
  • the iron nitride layer 7 also achieves a substantially improved corrosion resistance for the spinning ring 1, as a result of which the covering of the spinning ring 1 e.g. with an anti-rust agent.
  • the partial hardening of the spinning ring 1 can be carried out by means of electrical induction hardening, e.g. by means of a completely closed, non-overlapping induction coil which is connected to the part of the ring 1 to be hardened, i.e. the flange 2 of the same, e.g. is applied around its outer circumference.
  • the well-defined structural transition 14 occurs, which e.g. is known to be clearly recognizable in a micrograph with the unarmed eye.
  • the partial hardening of the spinning ring 1 in the zone 8 can, for example, depending on the type of steel, a thickness D and a height E of the flange 2, the desired height A of the zone 8 with ent accordingly adjusted intensity, or high energy density and / or duration, for example by means of high-frequency (HF) or medium-frequency (MF) induction hardening for a short time, for example for a duration of only seconds, in other words in the range of seconds, or in fractions of seconds.
  • HF high-frequency
  • MF medium-frequency
  • hardening can be achieved, for example, with flange thickness D in the range of 3-5 mm and flange height E in the range of 1.5-2 mm, in which hardened structure 9a is at a zone height away from flange top edge 2a of, for example, 0.5-1.0 mm.
  • MF hardening the spinning ring 1 can be hardened from the upper edge 2a to the ring web 5 at a height in the range of 2-3 mm.
  • the structural hardening can also be carried out by means of electron beam, laser beam or flame hardening.
  • the hardening can be carried out at a desired zone height from the outside or the inside of the spinning ring.
  • a flame-hardenable steel is preferably used as the type of steel.
  • Steel grades as specified by ISO standard No. 683 / X) i-1972 e.g. a Cf45 or Cf53 steel, or a steel specified in accordance with DIN standard No. 17.212, e.g. a Cf70 or 49CrMo4 steel, or a 100Cr6 steel, e.g. in the steel-iron material sheet nos. 200 and 350 of the iron and steel industry standards, Association of German Ironworkers, Düsseldorf.
  • a spinning ring 16 as can also be used on a ring spinning or ring twisting machine, has a locally limited, hardened zone 17, in which an upper, adjoining a ring web 18 and machined therewith from one piece Flange 19 lies with a rotor guide surface 20.
  • the zone 17 extends from a flange upper edge 19a beyond the flange 19 to an immediately adjoining area 21 of the ring web 18 at a height F which is less than a total height G of the spinning ring 16 which is shown in part.
  • a run-in layer 22 for a rotor (not shown) is formed in the surface of the steel, which has an outer layer 23 containing iron nitride, which extends over the entire outer surface of the spinning ring 16, to which one is hardened in zone 17 this limited, nitrogen-containing transition layer 24 connects, in which there is an austenitic-martensitic structure with an inwardly decreasing austenite content and therefore increasing hardness. Due to the partial hardening of the spinning ring 16, which can be carried out as described in the embodiment according to FIG.
  • a layer 25 is formed in the zone 17 which adjoins the transition layer 24 and is hardened in accordance with the contour of the flange 19, so that in the hardened zone 17 successively the run-in layer 22, the hardened layer 25 and a core 26 made of unhardened steel are present. Between the hardened layer 25 and the unhardened structure 26a there is again a delimited structure transition 27.
  • the inlet layer 22 has the same properties as were described for the inlet layer 11 1 of the embodiment according to FIGS. 1 and 2.
  • the contour hardening can e.g. by so-called pulse hardening in a fraction of a second, e.g. in the range of milliseconds, e.g. by G.
  • the embodiment according to FIG. 4 shows a spinning ring 28 made of steel, with an annular web 29 and an attached flange 30 with a rotor guide surface 31 and with a hardened zone 32 which is locally limited to a part of the spinning ring 28 containing the flange 30.
  • zone 32 there is an inlet layer 33 in the surface of the steel, to which a hardened steel base 34 adjoins.
  • the entire thickness H of the running-in layer 33 consists of an austenitic-martensitic structure 33a with a decreasing austenite content, continuously passing into the hardened steel base 34, with a decreasing austenite content, so that the running-in layer 33 hardens inwards again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP79901102A 1978-09-25 1980-04-22 Spinnring aus stahl für ringspinn- und ringzwirnmaschinen Expired EP0020399B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79901102T ATE3998T1 (de) 1978-09-25 1979-08-31 Spinnring aus stahl fuer ringspinn- und ringzwirnmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9995/78 1978-09-25
CH999578 1978-09-25

Publications (2)

Publication Number Publication Date
EP0020399A1 EP0020399A1 (de) 1981-01-07
EP0020399B1 true EP0020399B1 (de) 1983-06-29

Family

ID=4357977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79901102A Expired EP0020399B1 (de) 1978-09-25 1980-04-22 Spinnring aus stahl für ringspinn- und ringzwirnmaschinen

Country Status (10)

Country Link
EP (1) EP0020399B1 (it)
JP (1) JPS55500668A (it)
AR (1) AR222192A1 (it)
BE (1) BE878998A (it)
DE (1) DE2965796D1 (it)
ES (1) ES484725A1 (it)
HK (1) HK70184A (it)
IN (1) IN151786B (it)
IT (1) IT1123319B (it)
WO (1) WO1980000718A1 (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2104111B (en) * 1981-08-14 1986-04-23 Reiners Verwaltungs Gmbh Spinning rotor for an open-end spinning machine and method for its production
JPH0811848B2 (ja) * 1987-12-28 1996-02-07 金井 宏之 紡機用リング
US5829240A (en) * 1997-03-17 1998-11-03 A. B. Carter, Inc. Spinning ring having improved traveler bearing surface
US6360520B2 (en) 2000-01-14 2002-03-26 Ab Carter, Inc. Spinning ring having amorphous chromium bearing surface

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987871A (en) * 1958-02-17 1961-06-13 Kluttz Machine & Foundry Compa Spinning ring and method of making same
US3084501A (en) * 1962-08-24 1963-04-09 Kluttz Rings Inc Spinning rings
FR1333500A (fr) * 1962-09-13 1963-07-26 Lucas Industries Ltd Procédé de traitement superficiel d'acier non allié
DE1510885A1 (de) * 1965-02-05 1970-04-09 Reiners & Fuerst Spinn- oder Zwirnring
JPS4923977A (it) * 1972-06-30 1974-03-02

Also Published As

Publication number Publication date
WO1980000718A1 (fr) 1980-04-17
AR222192A1 (es) 1981-04-30
IN151786B (it) 1983-07-30
HK70184A (en) 1984-09-21
DE2965796D1 (en) 1983-08-04
EP0020399A1 (de) 1981-01-07
BE878998A (fr) 1980-03-25
IT7925971A0 (it) 1979-09-25
ES484725A1 (es) 1980-10-01
IT1123319B (it) 1986-04-30
JPS55500668A (it) 1980-09-18

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