CA1106246A - Rotor for an open end spinning machine - Google Patents
Rotor for an open end spinning machineInfo
- Publication number
- CA1106246A CA1106246A CA322,142A CA322142A CA1106246A CA 1106246 A CA1106246 A CA 1106246A CA 322142 A CA322142 A CA 322142A CA 1106246 A CA1106246 A CA 1106246A
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- steel
- set forth
- wall
- zone
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
- D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
- D01H4/10—Rotors
Abstract
Abstract of the Disclosure The spinning rotor is made from steel for an open end spinning machine and is provided with a thinwalled rotor wall with a fiber collecting groove and a locally limited hardened zone (11) comprising the fiber collecting groove at the largest inside diameter. Due to the partial hardening of the rotor wall, high wear resistance is achieved for the fiber collecting groove while the finished shape and roundness of the spinning rotor made from unhardened steel is maintained.
Description
11~629~6 A ROTOR FOR AN OPEN END SPINNING MACHINE
_ _ . _ _ _ This invention relates to a rotor for an open end spinning machine.
As is known, open end spinning machines are constructed with rotors which have a fiber collecting groove. During an open end spinning process, opened fibers are fed into the rotor and deposited in the fiber collecting groove in the form of a fiber ring. In order to attain an economic production, the spinning rotors have been rotated at very high rotation speeds. AS a result, the spinning rotors are subject to very high centrifugal forces and, thus, risk being deformed.
In order to avoid deformation at high centrifugal forces, it has been suggested, for example as described in ; German O S 2,504,401, to make the rotor of steel and to thereafter adjust the rotor to the roundness required.
~; Such a finished rotor body is usually of the required stability against deformation under the influence of high centrifugal forces. ~
However the unhardened steel processed into the shape of the rotor body, does not show the properties re-quired for preventing wear of the fiber collecting groove.
Due to the high centrifugal forces, the steel is worn out in ; the fiber collecting groove by e.g. foreign matter present in the fiber material, such as e.q. quartz particles in natural fiber material, or abrasive substances in man-made fibres, such as e.g. titan oxide. Thus,the rotor wall can be weakened prematurely. This can result in bursting of the rotor wall and, thus, can cause damage to the machine.
Further, a progressive wear of the rotor causes mainly a change in the geometry of the fiber collecting groove, which
_ _ . _ _ _ This invention relates to a rotor for an open end spinning machine.
As is known, open end spinning machines are constructed with rotors which have a fiber collecting groove. During an open end spinning process, opened fibers are fed into the rotor and deposited in the fiber collecting groove in the form of a fiber ring. In order to attain an economic production, the spinning rotors have been rotated at very high rotation speeds. AS a result, the spinning rotors are subject to very high centrifugal forces and, thus, risk being deformed.
In order to avoid deformation at high centrifugal forces, it has been suggested, for example as described in ; German O S 2,504,401, to make the rotor of steel and to thereafter adjust the rotor to the roundness required.
~; Such a finished rotor body is usually of the required stability against deformation under the influence of high centrifugal forces. ~
However the unhardened steel processed into the shape of the rotor body, does not show the properties re-quired for preventing wear of the fiber collecting groove.
Due to the high centrifugal forces, the steel is worn out in ; the fiber collecting groove by e.g. foreign matter present in the fiber material, such as e.q. quartz particles in natural fiber material, or abrasive substances in man-made fibres, such as e.g. titan oxide. Thus,the rotor wall can be weakened prematurely. This can result in bursting of the rotor wall and, thus, can cause damage to the machine.
Further, a progressive wear of the rotor causes mainly a change in the geometry of the fiber collecting groove, which
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is predetermined for spinning a desired yarn type, over the life of the rotor, and thus impairs the yarn quality.
Spinning rotors made from unhardened steel have thus not been used in practical production of open end yarns thus far. Instead, spinning rotors made from aluminium are in use, as the useful life span of such rotors is about 5,000 hours of operation. Spinning rotors provided with wear-reducing costs, have also been used. However, the life span of these rotors is increased to merely about 10,000 hours of operation. In either case, the bearings in which the rotors are mounted have a much longer life span. As a result, use of the known spinning rotors thus necessitates replacement of the rotors from time to time without replace-ment of the bearings.
As indicated in the German OS 2,551,045, the use of a hardened steel insert in a base body of a spinning rotor to prevent wear has the disadvantage that the insert, made first from unhardened steel, cannot be mounted in the base body after hardening without further machining, due, as well known, to a deformation of the steel, i.e. of the geo~*rical form of the insert, under the temperature stress during the hardening process.
Accordingly, it is an object of the invention to increase the life span of a rotor of an open end spinning machine.
It is another object of the invention to provide a rotor for an open end spinning machine which has a wear resistant fiber collecting groove.
It is another object of the invention to maintain the geometric form of a fiber collecting surface of a spinning Z~
rotor independently of the duration of operation.
It is another object of the invention to use a steel rotor in an open end spinning machine which is able to resist wear and has a relatively long life.
Briefly, the invention provides a steel rotor for an open end spinning machine which has a thin walled rotor wall made of unhardened steel and a fiber collecting groove in a hardened zone of the wall at a largest inside diameter of the ~ be A rotor. The hardened zone ~ formed within a locally limited zone of the rotor wall and is disposed between unhardened zones of the rotor.
Due to the locally limited, partial hardening of the thin rotor wall, a wear resistance of the fiber collecting groove is achieved, which excludes function-impairing wear of 15 the groove over a period corresponding to about the rotor ~ -bearing life span, which in rotors as operated practically at e.g. 45,000 r.p.m. presently can cover 40,000 operating hours. Thus, the predetermined geometrical form required for . . .
spinning a desired yarn is maintained over this time span.
The spinning rotor which, with respect to the specific weight of steel, is constructed with a thin rotor wall, not only presents the advantages of the strength of the steel as such, but also provides a wear resistance at the largest inside diameter, i.e. in the zone which is subject to maximum wear in the spinning process which, in other spinning rotors, cannot be achieved even with the use of expensive and complicated coatings of the wall. Of note, if such coats are worn off at one place, the whole rotor becomes unusable immediately due to pitting wear and must be replaced prematurely with respect to the rotor bearing.
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The spinning rotor also provides a life span corresponding to the useful life span of the rotor bearings as app-lied today, and which thus is about 5 to 10 times longer than in the spinning rotors used thus far. Thus, the necessity of re-equipping still operable bearings with a new rotor and of re-balancing the unit consisting of rotor and bearing is elimin-ated. Instead, the bearing and the rotor can be ordered as a balanced unit from a manufacturer and can be mounted as a re-placement of a unit with worn out bearings, without necessity of sending it back to the manufacturer for replacing a worn rotor and re-balancing the completed unit. A unit with the spinning rotor can be discarded by the spinner if the bearing is worn out, as the differential in the further life-span of the rotor and the bearing is too small to justify an exchange of one of these elements economically.
As the local hardening is limited to the zone of the fiber collecting groove, deformations of the spinning rotor, particularly of the thin rotor wall, during the hardening process are avoided, which necessarily would occur, if the whole spinning rotor is hardened.
The spinning rotor thus advantageously can be manufactured from the unhardened steel to its desired shape for use on thé open end spinning machine and, after possibly correct-ing the rotor for roundness, i.e. balancing, in the final geometric shape then can be hardened in the rotor wall zone containing the fiber collecting surface at the largest inside diameter. In this process, the finished shape is maintained --due to the partial hardening. In the locally limited zone, a metal structure is present which differs from the one in the zones of the spinning rotor not subject to the hardening process, the hardened metal structure presenting the wear-resistance desired but not influencing the geometrical shape of the rotor.
In one embodiment, the hardened zone is located in a rotor wall manufactured from one piece between unhardened zones. The rotor wall zones adjacent to the hardened zone can be of uniform wall thickness in such manner that uniform heat transport during the hardening process and thus uniform hardening without rotor deformation can be achieved.
In various embodiments of the invention, the hardened zone of the spinning rotor can be coated inside and/or outside by a rust-proofing medium, which does not impair the fiber material during the spinning process, e.g. can be zinc-coated.
These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:
Fig. 1 illustrates a cross-sectional view of a spinning rotor made from steel for an open end spinning machine in accordance with the invention;
Fig. 2 illustrates a part of the spinning rotor according to the portion A of Fig. 1 shown enlarged; and Fig. 3 illustrates a cross-sectional view of a modified spinning rotor made from steel for an open end spinning machine in accordance with the invention.
Referring to Fig. 1, the spinning rotor 1 is made from an unhardened steel la (Fig. 2) for an open end spinning machine and comprises a base body 2 and a peripheral rotor wall
.
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4~;
is predetermined for spinning a desired yarn type, over the life of the rotor, and thus impairs the yarn quality.
Spinning rotors made from unhardened steel have thus not been used in practical production of open end yarns thus far. Instead, spinning rotors made from aluminium are in use, as the useful life span of such rotors is about 5,000 hours of operation. Spinning rotors provided with wear-reducing costs, have also been used. However, the life span of these rotors is increased to merely about 10,000 hours of operation. In either case, the bearings in which the rotors are mounted have a much longer life span. As a result, use of the known spinning rotors thus necessitates replacement of the rotors from time to time without replace-ment of the bearings.
As indicated in the German OS 2,551,045, the use of a hardened steel insert in a base body of a spinning rotor to prevent wear has the disadvantage that the insert, made first from unhardened steel, cannot be mounted in the base body after hardening without further machining, due, as well known, to a deformation of the steel, i.e. of the geo~*rical form of the insert, under the temperature stress during the hardening process.
Accordingly, it is an object of the invention to increase the life span of a rotor of an open end spinning machine.
It is another object of the invention to provide a rotor for an open end spinning machine which has a wear resistant fiber collecting groove.
It is another object of the invention to maintain the geometric form of a fiber collecting surface of a spinning Z~
rotor independently of the duration of operation.
It is another object of the invention to use a steel rotor in an open end spinning machine which is able to resist wear and has a relatively long life.
Briefly, the invention provides a steel rotor for an open end spinning machine which has a thin walled rotor wall made of unhardened steel and a fiber collecting groove in a hardened zone of the wall at a largest inside diameter of the ~ be A rotor. The hardened zone ~ formed within a locally limited zone of the rotor wall and is disposed between unhardened zones of the rotor.
Due to the locally limited, partial hardening of the thin rotor wall, a wear resistance of the fiber collecting groove is achieved, which excludes function-impairing wear of 15 the groove over a period corresponding to about the rotor ~ -bearing life span, which in rotors as operated practically at e.g. 45,000 r.p.m. presently can cover 40,000 operating hours. Thus, the predetermined geometrical form required for . . .
spinning a desired yarn is maintained over this time span.
The spinning rotor which, with respect to the specific weight of steel, is constructed with a thin rotor wall, not only presents the advantages of the strength of the steel as such, but also provides a wear resistance at the largest inside diameter, i.e. in the zone which is subject to maximum wear in the spinning process which, in other spinning rotors, cannot be achieved even with the use of expensive and complicated coatings of the wall. Of note, if such coats are worn off at one place, the whole rotor becomes unusable immediately due to pitting wear and must be replaced prematurely with respect to the rotor bearing.
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The spinning rotor also provides a life span corresponding to the useful life span of the rotor bearings as app-lied today, and which thus is about 5 to 10 times longer than in the spinning rotors used thus far. Thus, the necessity of re-equipping still operable bearings with a new rotor and of re-balancing the unit consisting of rotor and bearing is elimin-ated. Instead, the bearing and the rotor can be ordered as a balanced unit from a manufacturer and can be mounted as a re-placement of a unit with worn out bearings, without necessity of sending it back to the manufacturer for replacing a worn rotor and re-balancing the completed unit. A unit with the spinning rotor can be discarded by the spinner if the bearing is worn out, as the differential in the further life-span of the rotor and the bearing is too small to justify an exchange of one of these elements economically.
As the local hardening is limited to the zone of the fiber collecting groove, deformations of the spinning rotor, particularly of the thin rotor wall, during the hardening process are avoided, which necessarily would occur, if the whole spinning rotor is hardened.
The spinning rotor thus advantageously can be manufactured from the unhardened steel to its desired shape for use on thé open end spinning machine and, after possibly correct-ing the rotor for roundness, i.e. balancing, in the final geometric shape then can be hardened in the rotor wall zone containing the fiber collecting surface at the largest inside diameter. In this process, the finished shape is maintained --due to the partial hardening. In the locally limited zone, a metal structure is present which differs from the one in the zones of the spinning rotor not subject to the hardening process, the hardened metal structure presenting the wear-resistance desired but not influencing the geometrical shape of the rotor.
In one embodiment, the hardened zone is located in a rotor wall manufactured from one piece between unhardened zones. The rotor wall zones adjacent to the hardened zone can be of uniform wall thickness in such manner that uniform heat transport during the hardening process and thus uniform hardening without rotor deformation can be achieved.
In various embodiments of the invention, the hardened zone of the spinning rotor can be coated inside and/or outside by a rust-proofing medium, which does not impair the fiber material during the spinning process, e.g. can be zinc-coated.
These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:
Fig. 1 illustrates a cross-sectional view of a spinning rotor made from steel for an open end spinning machine in accordance with the invention;
Fig. 2 illustrates a part of the spinning rotor according to the portion A of Fig. 1 shown enlarged; and Fig. 3 illustrates a cross-sectional view of a modified spinning rotor made from steel for an open end spinning machine in accordance with the invention.
Referring to Fig. 1, the spinning rotor 1 is made from an unhardened steel la (Fig. 2) for an open end spinning machine and comprises a base body 2 and a peripheral rotor wall
3. The wall 3 defines an interior chamber to receive opened fiber and has two legs 5, 5a which are disposed in V-shaped manner to define a V-shaped fiber collecting groove 4 with an i2~i aperture angle~ of about 30 to 130 degress. The legs 5, Sa intersect at a largest inside diameter B of the spinning rotor 1 under the angle ~ . With the leg 5a, the rotor wall 3 forms a bottom wall together with the base body 2 and on the other side with the free end of the leg 5 forms a rim 7 of the spinning rotor, which is open on one side.
The spinning rotor 1 is coaxially mounted on a shaft 8 by which the rotor can be set into rotation.
The fiber collecting groove 4 has a bottom 4b which is provided with a groove radius, ranging from 0.1 to 2 millimeters (mm). During use, the rotor 1 is rotated as fibers previously opened in the spinning process are deposited in the form of a fiber ring 9. The fibers are subsequently taken off in the form of a twisted yarn 10 (Fig. 2). Due to the high specific weight of steel, the rotor wall 3 is designed for the rotational speeds of the spinning rotor 1, which as a rule exceed 40,000 r.p/m. To this end, the wall 3 is thin walled with a uniform and constant wall thickness a in both legs 5, Sa. For example, according to the strength required and to the steel type used, the thickness a is in the range of 1 to 2 millimeters (mm), preferentially 1.5 millimeters (mm).
The spinning rotor 1 can be manufactured in one piece by machining from a solid piece on a lathe, or by transforming, such as e.g. compressing, flow-pressing, stamping or similar processes. Also, a rotor body, known as such, formed from steel sheet metal, of constant wall thickness in the rotor bottom wall and the rotor wall can be mounted onto a base body rigidly connected to the shaft 8.
The one-piece rotor wall 3 is hardened in a locally limited zone 11, in which the largest inside diameter B with the fiber collecting groove 4 is located, over the whole circumference and over the whole cross-section a, in such manner that a hardened metal structure ring with a V-shaped rotation surface C containing the fiber collecting groove 4 is formed. The hardened zone 11 is located between the zones 12, 12a consisting of unhardened steel and extends over the groove bottom 4b into both legs 5, 5a over a length D (Fig. 2) of the rotor wall 3 i.e. with a ring width which is smaller than the total length of the rotor wall 3 from the rotor rim 7 to the base body 2, in such manner that the fiber collecting groove 4 covered by the fiber ring 9 is located within the -hardened zone 11 (Fig. 2). The width of the ring preferent-ially is chosen to exceed the zones of wall surfaces 4a immediately adjacent to the groove bottom 4b and covered by the fiber material, i.e. that the width D exceeds a thick-ness E of the fiber ring 9. In this arrangement, the thick-ness E and the groove radius R are related. Between the zone 11, preferentially containing a hardened metal structure lla, and the zones 12, 12a each containing an unhardened metal structure la, a well defined metal structure transition zone 13 is present, depending on the temperature curve in the steel material during the hardening process.
The zone 11 extending over the whole circumference as a hardened metal structure ring can be produced by induc-tive hardening. Due to the steep temperature gradient in the zones outside a sharply limited electrical field, well defined transition zones 13 are produced, which e.g. in a ground cross-section are clearly visible, as well known, by the naked eye.
Inductive hardening can be effected using a completely closed, 1~6~6 but not overlapping, induction coil, which is placed around the portion of the rotor 1 to be hardened, e.g. around the outer circumference of the rotor 1, in such manner that the zone 11 is treated seamlessly, i.e. without interruption or overlapping. The partial hardening of the rotor wall 3 in the zone 11 can be effected e.g. depending on the type of steel, the wall thickness a, the desired width D of the zone 11, using correspondingly adapted intensities e.g. of the high frequency (HF) or medium frequency (MF) induction hardening within a short time. Using HF-hardening, e.g.
for a wall thickness a ranging from 1 to 2 mm, hardened zones can be produced in which the hardened metal structure extends in each leg 5, 5a from the inside diameter B over a length F of up to 3 mm, whereas, using a MF-hardening process each leg 5, 5a can be hardened over a length F in the range of 3 to 10 mm from the inside diameter B. Hardening of the metal structure, however, can also be effected by electron beam, laser beam, or flame hardening processes. Depending on the shape of the rotor 1 and depending on the hardening process chosen, the hardening over a desired length F, and thus a desired ring width D, can be achieved from the outside or from the inside of the rotor. In the later case, the hard-ening can also be effected over a part of the rotor wall thickness.
As to the steel type, preferably a flame hardening steel is used. For examples, steel types are suitable which are specified by the ISO-standard 683/X11-1972, such as e.g.
a Cf45 or a Cf53 steel, or a steel type as specified by the DIN-standard No. 17.212, such as e.g. a Cf 70 or a 49CrMo4-steel.
11(~6;~
Due to the locally limited, hardened zone 11, a wear resistance for the fiber collecting groove 4 is achieved in the otherwise unhardened rotor wall 3. This zone 11 can withstand the wear by fiber materials and by abrasive particles carried on by the fiber material without requiring additional adaption of the spinning rotor 1, such as by furth-er machining to a desired shape or roundness.
Due to the partial hardening of the rotor wall 3, the geometric shape of the wall 3, is maintained and a harde-ned metal structure is present merely in the zone 11. Due to~the high wear resistance of the zone 11 also, eventual re-processing of the rotor groove after a certain running time can be eliminated.~ As a whole, the useful life of the spinning rotor 1 is considerably prolonged by the zone 11, i.e. is prolonged to about the expected life span of the bearing tnot shown) used at the rotational speeds considered.
Referring to Fig. 3, a spinning rotor 14 made of unhardened steel 14a with a base body 15 carried on and rotated by a shaft 16 can also be constructed with a rotor wall 17 of constant wall thickness, i.e. of constant cross-section b which, in a horizontal bottom wall portion 18, is adjacent to the base body 15, and which is provided with a short leg 19 angled off from there to the outside to meet a leg l9a angled in the direction of the spinning rotor 14 towards the inside. At the meeting point of the legs 19, l9a, a largest inside diameter G of the spinning rotor 14 is present, at which a fiber collecting groove 20 with an acute aperture angle~ is provided. The rotor wall 17 is partially hardened in the zone where the legs 19, l9a meet, 10 .
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in such manner that, as above, a locally limited hardened zone 21 is provided between wall portions of the rotor wall 17 made from unhardened steel 14a. If required, the hardened zone 21 can extend over the whole length of the short leg 19 and also over a part of the bottom wall portion 18 ad]acent to the short leg 19.
11 .
The spinning rotor 1 is coaxially mounted on a shaft 8 by which the rotor can be set into rotation.
The fiber collecting groove 4 has a bottom 4b which is provided with a groove radius, ranging from 0.1 to 2 millimeters (mm). During use, the rotor 1 is rotated as fibers previously opened in the spinning process are deposited in the form of a fiber ring 9. The fibers are subsequently taken off in the form of a twisted yarn 10 (Fig. 2). Due to the high specific weight of steel, the rotor wall 3 is designed for the rotational speeds of the spinning rotor 1, which as a rule exceed 40,000 r.p/m. To this end, the wall 3 is thin walled with a uniform and constant wall thickness a in both legs 5, Sa. For example, according to the strength required and to the steel type used, the thickness a is in the range of 1 to 2 millimeters (mm), preferentially 1.5 millimeters (mm).
The spinning rotor 1 can be manufactured in one piece by machining from a solid piece on a lathe, or by transforming, such as e.g. compressing, flow-pressing, stamping or similar processes. Also, a rotor body, known as such, formed from steel sheet metal, of constant wall thickness in the rotor bottom wall and the rotor wall can be mounted onto a base body rigidly connected to the shaft 8.
The one-piece rotor wall 3 is hardened in a locally limited zone 11, in which the largest inside diameter B with the fiber collecting groove 4 is located, over the whole circumference and over the whole cross-section a, in such manner that a hardened metal structure ring with a V-shaped rotation surface C containing the fiber collecting groove 4 is formed. The hardened zone 11 is located between the zones 12, 12a consisting of unhardened steel and extends over the groove bottom 4b into both legs 5, 5a over a length D (Fig. 2) of the rotor wall 3 i.e. with a ring width which is smaller than the total length of the rotor wall 3 from the rotor rim 7 to the base body 2, in such manner that the fiber collecting groove 4 covered by the fiber ring 9 is located within the -hardened zone 11 (Fig. 2). The width of the ring preferent-ially is chosen to exceed the zones of wall surfaces 4a immediately adjacent to the groove bottom 4b and covered by the fiber material, i.e. that the width D exceeds a thick-ness E of the fiber ring 9. In this arrangement, the thick-ness E and the groove radius R are related. Between the zone 11, preferentially containing a hardened metal structure lla, and the zones 12, 12a each containing an unhardened metal structure la, a well defined metal structure transition zone 13 is present, depending on the temperature curve in the steel material during the hardening process.
The zone 11 extending over the whole circumference as a hardened metal structure ring can be produced by induc-tive hardening. Due to the steep temperature gradient in the zones outside a sharply limited electrical field, well defined transition zones 13 are produced, which e.g. in a ground cross-section are clearly visible, as well known, by the naked eye.
Inductive hardening can be effected using a completely closed, 1~6~6 but not overlapping, induction coil, which is placed around the portion of the rotor 1 to be hardened, e.g. around the outer circumference of the rotor 1, in such manner that the zone 11 is treated seamlessly, i.e. without interruption or overlapping. The partial hardening of the rotor wall 3 in the zone 11 can be effected e.g. depending on the type of steel, the wall thickness a, the desired width D of the zone 11, using correspondingly adapted intensities e.g. of the high frequency (HF) or medium frequency (MF) induction hardening within a short time. Using HF-hardening, e.g.
for a wall thickness a ranging from 1 to 2 mm, hardened zones can be produced in which the hardened metal structure extends in each leg 5, 5a from the inside diameter B over a length F of up to 3 mm, whereas, using a MF-hardening process each leg 5, 5a can be hardened over a length F in the range of 3 to 10 mm from the inside diameter B. Hardening of the metal structure, however, can also be effected by electron beam, laser beam, or flame hardening processes. Depending on the shape of the rotor 1 and depending on the hardening process chosen, the hardening over a desired length F, and thus a desired ring width D, can be achieved from the outside or from the inside of the rotor. In the later case, the hard-ening can also be effected over a part of the rotor wall thickness.
As to the steel type, preferably a flame hardening steel is used. For examples, steel types are suitable which are specified by the ISO-standard 683/X11-1972, such as e.g.
a Cf45 or a Cf53 steel, or a steel type as specified by the DIN-standard No. 17.212, such as e.g. a Cf 70 or a 49CrMo4-steel.
11(~6;~
Due to the locally limited, hardened zone 11, a wear resistance for the fiber collecting groove 4 is achieved in the otherwise unhardened rotor wall 3. This zone 11 can withstand the wear by fiber materials and by abrasive particles carried on by the fiber material without requiring additional adaption of the spinning rotor 1, such as by furth-er machining to a desired shape or roundness.
Due to the partial hardening of the rotor wall 3, the geometric shape of the wall 3, is maintained and a harde-ned metal structure is present merely in the zone 11. Due to~the high wear resistance of the zone 11 also, eventual re-processing of the rotor groove after a certain running time can be eliminated.~ As a whole, the useful life of the spinning rotor 1 is considerably prolonged by the zone 11, i.e. is prolonged to about the expected life span of the bearing tnot shown) used at the rotational speeds considered.
Referring to Fig. 3, a spinning rotor 14 made of unhardened steel 14a with a base body 15 carried on and rotated by a shaft 16 can also be constructed with a rotor wall 17 of constant wall thickness, i.e. of constant cross-section b which, in a horizontal bottom wall portion 18, is adjacent to the base body 15, and which is provided with a short leg 19 angled off from there to the outside to meet a leg l9a angled in the direction of the spinning rotor 14 towards the inside. At the meeting point of the legs 19, l9a, a largest inside diameter G of the spinning rotor 14 is present, at which a fiber collecting groove 20 with an acute aperture angle~ is provided. The rotor wall 17 is partially hardened in the zone where the legs 19, l9a meet, 10 .
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in such manner that, as above, a locally limited hardened zone 21 is provided between wall portions of the rotor wall 17 made from unhardened steel 14a. If required, the hardened zone 21 can extend over the whole length of the short leg 19 and also over a part of the bottom wall portion 18 ad]acent to the short leg 19.
11 .
Claims (20)
1. A steel rotor for an open end spinning machine having a thin walled rotor wall made of unhardened steel and a fiber collecting groove in a hardened zone of said wall at a largest inside diameter of said rotor.
2. A steel rotor as set forth in claim 1 wherein said rotor wall has an unhardened zone on each side of said hardened zone.
3. A steel rotor as set forth in claim 1 wherein said hardened zone extends over the whole cross-section of said rotor wall.
4. A steel rotor as set forth in claim 1 wherein said rotor wall has two portions merging at said largest inside diameter to define said fiber collecting groove.
5. A steel rotor as set forth in claim 1 wherein said rotor wall is of constant cross-section adjacent to said hardened zone.
6. A steel rotor as set forth in claim 1 wherein said rotor wall is of a thickness of from 1 to 2 millimeters in said hardened zone.
7. A steel rotor as set forth in claim 6 wherein said rotor wall is of a thickness of 1.5 millimeters in said hardened zone.
8. A steel rotor as set forth in claim 1 wherein said hardened zone is structure hardened.
9. A steel rotor as set forth in claim 8 wherein a well-defined structure transition exists between said hardened zone and an adjacent unhardened zone.
10. A steel rotor as set forth in claim 1 wherein said hardened zone is flame-hardened.
11. A steel rotor as set forth in claim l wherein said hardened zone is inductively-hardened.
12. A steel rotor as set forth in claim 1 made of a steel selected from the group consisting of Cf 45-, Cf 53-, Cf 70-, and 49 Cr Mo 4 - steel.
13. A steel rotor as set forth in claim 1 wherein said rotor wall has an unhardened zone on each side of said hardened zone with said zones being of the same wall thickness.
14. A steel rotor as set forth in claim 13 having an anticorrosion agent coating thereon.
15. A steel rotor as set forth in claim 1 wherein said rotor wall has an unhardened zone on each side of said hardened zone and is made of one-piece.
16. A steel rotor as set forth in claim 1 wherein said hardened zone is of greater width than said fiber collecting groove.
17. A steel rotor as set forth in claim l wherein said hardened zone forms a V-shaped rotation surface cont-aining said fiber collecting groove.
18. A steel rotor having a peripheral wall defining a chamber, said wall having a hardened zone and a fiber coll-ecting groove in said hardened zone facing said chamber at a largest inside diameter of said chamber.
19. A steel rotor as set forth in claim 18 wherein said wall has two portions disposed in V-shaped manner to define said groove.
20. A steel rotor as set forth in claim 18 of one piece construction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH202578 | 1978-02-24 | ||
| CH2025/78 | 1978-02-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1106246A true CA1106246A (en) | 1981-08-04 |
Family
ID=4224154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA322,142A Expired CA1106246A (en) | 1978-02-24 | 1979-02-23 | Rotor for an open end spinning machine |
Country Status (19)
| Country | Link |
|---|---|
| EP (1) | EP0009497A1 (en) |
| JP (1) | JPS55500140A (en) |
| AR (1) | AR220742A1 (en) |
| AT (1) | AT372119B (en) |
| AU (1) | AU529171B2 (en) |
| BE (1) | BE874424A (en) |
| BR (1) | BR7906846A (en) |
| CA (1) | CA1106246A (en) |
| CS (1) | CS220323B2 (en) |
| DE (1) | DE2936565A1 (en) |
| FI (1) | FI64955C (en) |
| GB (1) | GB2036098A (en) |
| IL (1) | IL56641A (en) |
| IN (1) | IN151789B (en) |
| IT (1) | IT1111526B (en) |
| NL (1) | NL7901186A (en) |
| PT (1) | PT69263A (en) |
| WO (1) | WO1979000659A1 (en) |
| ZA (1) | ZA79747B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6059133A (en) * | 1983-09-09 | 1985-04-05 | Toyoda Autom Loom Works Ltd | Rotor for open end fine spinning frame |
| DE4441087A1 (en) † | 1994-11-18 | 1996-05-23 | Rieter Ingolstadt Spinnerei | Open-end spinning device |
| DE19910277B4 (en) | 1999-03-09 | 2010-11-04 | Oerlikon Textile Gmbh & Co. Kg | Spinning rotor for open-end spinning machines |
| KR20030072092A (en) * | 2002-03-05 | 2003-09-13 | 장동우 | Rotor for spinning frame and manufacturing method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1080587B (en) * | 1976-07-17 | 1985-05-16 | Schubert & Salzer Maschinen | SPINNING ROTOR FOR OPEN END SPINNING MACHINES WITH A BASE BODY AND ANULAR INSERT FORMING THE INTERNAL SURFACES OF THE SPINNING ROTOR |
| GB1591192A (en) * | 1977-02-25 | 1981-06-17 | Platt Saco Lowell Ltd | Open-end spinning apparatus |
| JPS5824531A (en) * | 1981-08-06 | 1983-02-14 | Sumitomo Chem Co Ltd | Novel dihydric phenol derivative and its preparation |
-
1979
- 1979-02-01 GB GB7932157A patent/GB2036098A/en not_active Withdrawn
- 1979-02-01 WO PCT/EP1979/000005 patent/WO1979000659A1/en unknown
- 1979-02-01 DE DE792936565A patent/DE2936565A1/en active Pending
- 1979-02-01 JP JP50041279A patent/JPS55500140A/ja active Pending
- 1979-02-01 BR BR7906846A patent/BR7906846A/en unknown
- 1979-02-11 IL IL56641A patent/IL56641A/en unknown
- 1979-02-12 AT AT0105479A patent/AT372119B/en not_active IP Right Cessation
- 1979-02-14 NL NL7901186A patent/NL7901186A/en not_active Application Discontinuation
- 1979-02-15 AR AR275516A patent/AR220742A1/en active
- 1979-02-19 IT IT20339/79A patent/IT1111526B/en active
- 1979-02-19 ZA ZA79747A patent/ZA79747B/en unknown
- 1979-02-21 PT PT69263A patent/PT69263A/en unknown
- 1979-02-22 CS CS791220A patent/CS220323B2/en unknown
- 1979-02-22 AU AU44521/79A patent/AU529171B2/en not_active Ceased
- 1979-02-23 FI FI790617A patent/FI64955C/en not_active IP Right Cessation
- 1979-02-23 CA CA322,142A patent/CA1106246A/en not_active Expired
- 1979-06-23 BE BE0/193676A patent/BE874424A/en unknown
- 1979-09-11 EP EP79900191A patent/EP0009497A1/en not_active Withdrawn
-
1980
- 1980-01-02 IN IN13/CAL/83A patent/IN151789B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IT7920339A0 (en) | 1979-02-19 |
| DE2936565A1 (en) | 1980-11-27 |
| FI64955C (en) | 1984-02-10 |
| IN151789B (en) | 1983-07-30 |
| CS220323B2 (en) | 1983-03-25 |
| GB2036098A (en) | 1980-06-25 |
| IL56641A (en) | 1982-03-31 |
| FI64955B (en) | 1983-10-31 |
| FI790617A (en) | 1979-08-25 |
| ATA105479A (en) | 1983-01-15 |
| AT372119B (en) | 1983-09-12 |
| AR220742A1 (en) | 1980-11-28 |
| AU529171B2 (en) | 1983-05-26 |
| EP0009497A1 (en) | 1980-04-16 |
| AU4452179A (en) | 1979-08-30 |
| ZA79747B (en) | 1980-05-28 |
| IT1111526B (en) | 1986-01-13 |
| NL7901186A (en) | 1979-08-28 |
| WO1979000659A1 (en) | 1979-09-06 |
| BE874424A (en) | 1979-08-23 |
| JPS55500140A (en) | 1980-03-13 |
| BR7906846A (en) | 1980-02-26 |
| PT69263A (en) | 1979-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |