EP1068382B1 - Ring for ring frames and ring twisters - Google Patents

Abstract

A ring for a ring spinning or a ring twisting machine, comprising an annular polished core and a hard chrome layer, wherein the core is coated with a copper layer, and wherein the hard chrome layer is applied to the copper layer.

Description

The invention relates to a ring for ring spinning and Ring twisting machines.

A ring for a ring spinning or ring twisting machine In addition to a precisely worked shape, the Customized, optimized surface have a ring traveler running at speeds up to 55m / s revolves on the ring, a calm and to enable running with as little wear as possible. Therefor the surface of the ring must be as smooth and hard as possible and may only be a small one for the ring traveler Oppose running resistance. The ring should be low in wear, as the wear of the Ringes also the quiet running of the ring traveler on the ring is impaired, resulting in increased thread breaks can lead. It also increases with increasing Wear defects of the ring also the wear of the Ring traveler too, resulting in shorter downtimes of Ring traveler and ring leads, which in turn, like that increased thread breaks, which increases production costs.

From US 2,970,425 rings for ring spinning and Ring twisting machines are known which have a polished core have that with nickel, chrome or other conventional available metals is electrolytically coated and this coating in turn is polished.

The object of the present invention is therefore a To create a ring for ring spinning and ring twisting machines, which is a more economical use of rings and Ring travelers allowed.

This task is accomplished by a ring that the Features of claim 1.

A hard chrome layer gives the ring a very hard, wear - resistant surface that is firmly attached to the core of the Ringes is liable. Hardness values of the are advantageous Hard chrome layer measured according to Vickers HV 0.05 out of 900 to 1300, preferably with values over 1000. Amazingly, the hard chrome layer can be easily can be used as a coating for the ring, though when the ring traveler rotates quickly on the rings very high temperatures (up to approx. 1000 ° C) can occur. A specialist is known (cf. Schatt: "Materials of the Machine, plant and apparatus construction ", VEB Deutscher Verlag für Grundstoffindustrie, Leipzig 1982, p. 144), that hard chrome layers at temperatures above 400 ° C soften, which is why the use of hard chrome coatings never considered for rings were.

The core of the ring has a core surface that polished before applying the hard chrome layer is. The core is with a copper or nickel layer coated, which in turn is then polished and on the hard chrome layer is arranged. Especially Such nickel or copper layers are advantageous the core and under the hard chrome layer for corrosive Operating conditions of the ring. One on a polished one Hard chrome layer applied to the core surface has a very smooth surface on what a very quiet run of a ring traveler on the hard chrome-plated ring causes. Commissioning without a ring inlet is therefore without Problems possible, what through the loss of production Break-in times greatly reduced.

Rings that have a core with a nickel or Have copper layer, which under the hard chrome layer arranged, show a particularly good Corrosion resistance, making them suitable for use under extreme conditions, e.g. wet spinning, are particularly suitable.

A ring, the one attached to the core of the ring Hard chrome layer also a polished surface has special advantages, because by the Polishing the surface of the hard chrome layer sharp - edged tips of chrome crystals that come from the Surface of the hard chrome layer can protrude, be rounded off. These pointed, sharp-edged Crystals of the hard chrome layer look like a file and result in sliding or over the hard chrome layer slipping objects to heavy wear. These file-like properties of the previously known Hard chrome layers are another reason why Hard chrome layers have never been used for rings for ring spinning or Ring twisting machines have been considered. Become the hard crystal tips of the hard chrome layer but rounded off by polishing, so this problem eliminated. The ring sets the one running around it Ring traveler only a low running resistance counter and there is no increased wear on Ring traveler on. So the core surface and the Surface of the hard chrome layer polished, so you get a very smooth, hard and wear-resistant Ring surface on which the ring traveler with little Wear can circulate. The roughness of the core surface is before applying the hard chrome layer e.g. Ra 0-0.3 µm, preferably less than 0.2 µm. At a Value Ra of the core surface of e.g. 0.15 µm also shows the surface of the hard chrome layer applied thereon a roughness of approximately 0.15 µm.

Are structured hard chrome layers (so-called topocrom layers) and / or chrome dispersion layers in which non-metallic components are enriched (ECD layers) used, so the properties the hard chrome layer vary and the respective Adapt requirements exactly.

It is also advantageous if the core of the ring is made of tempered steel. From the high speeds, with which the ring travelers can run on the rings large centrifugal forces arise, so that the ring traveler Apply pressure to the ring. Thread breaks at these circulation speeds can increase a sudden shock load on the ring caused by the Lead ring traveler. A core material that is too soft leads to such pressure or impact loads Damage to the core and hard chrome layer. Is this Base material of the ring, on the other hand, is a tempered steel, see above gives the material lying under the hard chrome layer even with high pressure and sudden impact loads not after and the ring can withstand these loads without Damage to the hard chrome layer and the underlying one Survive core. This is possible because of the Coating with the hard chrome layer at temperatures below 100 ° C and thereby the Properties such as the hardness, the base material no longer e.g. by recrystallization or Thermal diffusion processes are changed. The lifespan the ring is raised, and even after an event like e.g. a thread break, is still a quiet, low-wear running of the ring traveler on the ring possible. As particularly suitable for use as a core tempered roller bearing steel has been proven in one ring.

The hard chrome layer advantageously has a thickness between 1 µm and 60 µm, the layer thickness in a preferred embodiment in the range of the highest Stress, i.e. in those areas of the ring that with the ring traveler during his run on the ring in Contact is the thickest.

A ring that covers the hard chrome layer only in the areas which, when the ring traveler runs on the ring Form contact surfaces between ring and ring traveler just like one completely with a hard chrome layer coated ring for better running properties of the Ring traveler on the ring and thus to higher ones Downtimes, fewer thread breaks and one too less wear on the ring itself, which also means such a ring a more economical use of ring and ring traveler is possible.

The ring has at least one electrical contact point, over which the ring during the application of the Hard chrome layer is powered. This Electrical contact point is advantageously in the Area of a seat that the contact surfaces exhibiting area, e.g. a flange. This arrangement ensures that in the area no undesirable bumps in the contact surfaces, Roughness or other disturbances caused by the Electrical contact points in the hard chrome layer or on the surface of the ring arise. Even if after polishing the hard chrome layer the place of Electrical contact points no longer localized by the eye hard chrome layer at these locations but have micro-faults, which wear resistance or run of the ring traveler or the Negatively affect the wear resistance of the ring.

An inventive, hard chrome plated ring advantageous in all spinning mills and Threading plants with ring spinning or with Ring twisting machines work because of the use of such a ring the production costs can be reduced can. The ring offers special advantages everywhere where materials are processed that are being processed lubricating substances, e.g. animal fat or Fibers with lubricating properties, in the range of Submit rings and the ring traveler. Most notably the ring is suitable for processing cotton with their short, lubricating fibers. Since the Surface of the ring has a very high wear resistance has and the ring traveler only a small Opposed running resistance, so that this on a such a ring runs with very little wear, no one is required additional lubrication, e.g. with molybdenum disulfide lubricant, to long service life and a continuous work with few thread breaks guarantee. Even for conditions as extreme as they are occur when wet spinning, the ring is very good suitable. Good corrosion resistance like them under these conditions is particularly important with reached a ring traveler whose hard chrome layer e.g. is undercoated or copper coated.

Other preferred embodiments and uses are the subject of further dependent claims.

Fig. 1

einen Teil eines Ringes mit einem T-Flansch und mit einem auf ihm umlaufenden Ringläufer;

Fig. 2a bis 2c

Ringe mit verschiedenen Flanschprofilen im Querschnitt mit jeweils passenden Ringläufern

Fig. 3b

den Ring aus Fig. 2a mit nur teilweise beschichteter Kernoberfläche; und

Fig. 3b

den Ring aus Fig. 2a mit vollständig beschichteten Kern und angedeuteter Schichtdickenverteilung der Hartchromschicht auf diesem Kern.

The invention is explained below by way of example with reference to FIGS. 1 to 3. It shows purely schematically:

Fig. 1

part of a ring with a T-flange and with a ring traveler running on it;

2a to 2c

Rings with different flange profiles in cross-section with matching ring travelers

Fig. 3b

the ring from Figure 2a with only partially coated core surface. and

Fig. 3b

the ring from Fig. 2a with completely coated core and indicated layer thickness distribution of the hard chrome layer on this core.

Fig. 1 shows a perspective part of one with a Hard chrome layer 26 (not explicitly shown) coated ring 10 with e.g. from tempered Rolling steel manufactured core 11, one side is designed as a T-flange 12. The flange 12 opposite side is designed as a seat 18, the seat 18 in a variety of ways can be configured, for example as in Fig. 2c shown. The annular core 11 of the ring 10 has a polished core surface 28.

In the area of the seat 18 there is one Electrical contact point 19 (dashed in Fig. 1 indicated) over which the ring during the electrochemical Applying the hard chrome layer with electricity is supplied. Before the cathodic deposition of the chrome on the ring 10 is the core 11 of the ring 10, the one Has core surface 28, with a nickel or Copper layer (29) coated.

On the T-flange 12, that shown in Fig. 1, hard chrome plated ring 10, runs a matching C-shaped Ring traveler 14 in the direction of arrow I. Through the acting on the ring traveler 14 during the circulation Centrifugal force (arrow F) becomes the ring traveler 14 on the ring 10 in the radial direction with respect to the ring 10 outwards pressed. An invisible flank of the C-shaped Ring traveler 14 hangs on the radially inner side 16 of the flange 12 of the ring 10 and holds the Ring traveler 14 on ring 10.

2a and 2b are two on average Designs of hard chrome-plated rings 10 with T flanges 12 and with something to match differently designed C-shaped ring travelers 14 shown. In FIG. 2c, on the other hand, the section is one hard-chromed ring 10 shown, the core 11 in Form of an inclined flange 17 is formed. Also from the core 11 is shaped opposite the inclined flange 17 in this example a square cross section having seat 18 arranged. On the bevel flange 17 a matching hook-shaped ring traveler 19 is shown. All ring travelers 14, 19 are in a position with respect to the respective flange 12, 17 shown during of the company in relation to the ring 10. A each with respect to the ring 10 radially inner flank 20, 22 of the ring traveler 14, 19 lies on the radially inside lying side 16, 16 'of the respective flange 12, 17, so that between the ring traveler 14, 19 and the flange 12, 17 of the respective ring 10 a contact surface 24 forms. In the area of this contact surface 24 Stress on the ring 10 in relation to wear, Temperature, pressure, etc. greatest. To this burden To meet accordingly, a hard chrome layer 26 in this area of the ring 10 thickest.

3a and 3b, the ring from FIG. 2a is again shown in section. The hard chrome layer 26 covers 3a only a part of the core surface 28 which in 3b shown ring 10, however, is complete with the Hard chrome layer 26 coated. The hard chrome layer 26 is directly on the polished core surface 28 of the core 11 of the respective ring 10 applied. Since a thread 30, which during operation by the ring traveler 14, 19 is passed through (indicated by dashed lines in FIG. 1), depending on speed, type of thread and Machine settings under one different the area of the ring 10 or its flange 12, 17, which with the ring traveler 14, 19 the contact surface 24 forms vary locally. On Area A on the radially inner side 16 of the Flange 12 of the ring 10 on which the Can form contact surface 24 is therefore somewhat larger chosen as the actually at this point forming contact surface 24.

Since this area A, in which the contact surface 24 will train during operation, the highest The hard chrome layer 26 is exposed to loads either more or less only in this area A (cf. 3a) or thickest in this area A (see FIG. 3b) applied.

Fig. 3a shows an embodiment in which the Hard chrome layer 26 primarily in area A and one more little in a transition area B, which can also be loaded can (see below) is applied. The Residual area C of the ring 10 is not with the Hard chrome layer 26 coated. Such a ring 10 has the same advantages, less wear and tear Ring 10 and ring traveler 14, 19, very quiet running, little Thread breaks, etc., like a completely chrome-plated one Ring 10.

In the fully coated shown in Fig. 3b Embodiment is the thickness of the hard chrome layer 26 in area A e.g. 20-40 µm. In one Transition area B on the radially inner side 16 of the flange 12 has the hard chrome layer 26 average thickness of 10 to 25 microns. The layer thickness in Remaining area C, the remaining part of the ring 10 is at least 4 µm. The reason for that average layer thickness of the hard chrome layer 26 in Transition area B of the ring 10 is that during operation with an unfavorable parameter setting (Thread type, thread thickness, ring traveler shape, Ring traveler weight etc.) also in this transition area B a contact surface 24 between ring traveler 14, 19 and ring 10 can form. So that the ring 10 after a one time Operation with such an unsuitable parameter setting not immediately damaged and it can still be used without any problems useful that the ring 10 in this area B a little has thicker hard chrome layer 26 than in the remaining area C.

For a quiet and, above all, low-wear running of the Ring traveler 14, 19 is to be ensured on the ring 10 the surface 32 of the hard chrome layer 26 in both Examples at least in area A e.g. to Ra 0.2 µm polished.

So that the core 11 of the ring 10 is just as resistant is like the hard chrome layer 26, the core is 11 For example, a bearing steel with a tempered Surface. Impact or pressure loads can be from Ring 10 can be added without the Hard chrome layer 26 due to a yielding of a core 11 from relatively "soft" material would be damaged. As The basic material for the core 11 are of course also other materials such as other case hardened quenched and tempered steels, ceramics, Plastics or e.g. Composite materials conceivable that comparable properties, e.g. Hardness, impact resistance etc., such as tempered roller bearing steel. For the core can have better corrosion resistance a nickel or copper layer. The Hard chrome layer itself can also be an ECD or Topocrom layer.

How the different forms of the in Figs. 2a to 2c have already indicated rings 10 are suitable all ring shapes to ring 10 with hard chrome layer 26 to be trained. Also regarding the material and the shape of the ring traveler 14, 19 there are none Restrictions on their usability together with the ring 10 according to the invention.

Claims (10)

1. Ring (10) for a ring spinning or a ring twisting machine, with an annular polished core (11) and with a chrome layer, charaterized in that the core is coated with a nickel or copper layer, and in that a hard chrome layer (26) is applied to the latter.
2. Ring according to Claim 1, characterized in that the hard chrome layer (26) has a polished surface.
3. Ring according to Claim 1 or 2, characterized in that the copper or nickel layer has a polished surface.
4. Ring according to one of the preceding claims, characterized in that the hard chrome layer is a hard chrome layer intrinsically structured and/or enriched with nonmetallic components.
5. Ring according to one of the preceding claims, characterized in that the core (11) of the ring (10) is composed of steel, in particular of a heat-treated steel.
6. Ring according to one of the preceding claims, characterized in that the hard chrome layer (26) is between 1 µm and 60 µm thick and has a hardness HV of between 900 and 1200 and a roughness Ra of, in particular, up to 0.3 µm.
7. Ring according to one of the preceding claims, characterized in that it has a contact surface (24) which is determined by the contact locations occurring when a ring traveller (14, 19) is running on the ring (10), and in that at least the contact surface (24) has a hard chrome layer (26), while, should further surfaces have a hard chrome layer (26), the hard chrome layer (26) of the contact surfaces is the thickest.
8. Ring according to Claim 7, characterized in that the ring (10) has an electrocontact location (19) on a seat (18) located opposite the side having the contact surface (24), said side preferably being in the form of a flange (12).
9. Use of the ring (10) according to one of Claims 1 to 8 for the processing of fibrous materials which discharge substances having lubricating properties, in particular fibres having a lubricating action, such as cotton.
10. Use of the ring (10) according to one of claims 1 to 8 in a spinning mill or twisting mill.

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