DE102007056566B4 - Process for coating a clothing ring of an opening roller and a clothing ring for an opening roller - Google Patents

Abstract

Process for coating a clothing ring (17, 30) of an opening roller (1) for dissolving chemical fiber material onto which at least two layers are applied by chemical coating, characterized in that - the coating does not contain hard material, - that the clothing ring ( 17, 30) a first layer is applied as a base coat of a non-ferrous metal, - that on the base coat at least one further, layer based on a nickel-phosphorus alloy is applied, and that the coated fitting ring (17, 30) then a heat treatment is performed, wherein the heat treatment is carried out in a temperature range which is below the tempering temperature of the base material of the fitting ring (17, 30).

Description

The present invention relates to a method for coating a clothing ring of an opening roller according to the preamble of claim 1 and to a clothing ring for an opening roller according to the preamble of claim 9.

Opening rollers for open-end spinning devices are known in various embodiments. Such opening rollers are used to dissolve a sliver delivered in sliver cans prior to feeding into the rotating at high speed spinning means of the open-end spinning device in individual fibers. Such opening rollers have for this purpose on their periphery a tear structure, which meshes with the supplied sliver and thereby dissolves into its individual fibers. Among other things, the opening rollers differ in the design of their tearing tools, the so-called set rings.

So it is from the DE 35 151 53 C2 known to form the fitting ring as a so-called solid ring, that is, the fitting ring is made of a solid, hardened steel ring. In this case, in order to form the tearing tool, at least one circumferential groove in the circumferential direction and several notches extending essentially orthogonally thereto are ground into the circumferential surface of the fitting ring. Such solid rings are characterized by a high degree of functionality.

Furthermore, from the DE 198 13 991 A1 a fitting ring, in which a clothing wire is applied helically to the lateral surface of a cylindrical body. In this case, the basic body consisting of a relatively soft metallic material, for example aluminum, is provided with a spiral groove on its lateral surface. In this groove of the clothing wire is inserted and then fixed there mechanically. Both types of clothing rings have in common that as a wear protection, a multilayer, hardstoffkörperhaltige coating, in particular a nickel-diamond coating is applied.

The nickel-diamond coating, however, proves to be disadvantageous if the processing of man-made fibers is intended. In the processing of chemical fibers, in particular for the production of coarse yarns with yarn counts below Nm 14, a stable spinning process while maintaining all the quality features of the spun yarn is difficult to achieve. The clothing rings provided with the nickel-diamond coating have a high surface roughness, which leads to damage of the chemical fiber material dissolved to individual fibers, which results in a significant increase in yarn breaks in the subsequent spinning process. Likewise, due to the damage of the chemical fibers, a reduction in the strength values and the elongation values can be observed.

The US 4,358,922 A discloses a coating for parts of textile machines having at least two layers, the first layer containing hard material bodies and the second layer containing no hard material bodies.

The object of the present invention is to provide a method for coating a clothing ring of an opening roller for processing manmade fibers, by means of which a dimensionally stable surface with high wear resistance of the clothing ring is achieved. In addition, the invention is based on the object to provide a fitting ring for an opening roller, which is characterized by a high wear resistance, taking into account the desired yarn quality in the processing of man-made fibers.

The objects are achieved by the characterizing features of the method claim 1 as well as the device claim 9 solved.

Advantageous developments are the subject of the dependent claims 2 to 8th and the dependent claims 10 and 11 ,

According to claim 1, a method for coating a fitting ring of an opening roller is proposed, which is provided with at least two layers, wherein on the fitting ring a base coat of a non-ferrous metal is applied, the fitting ring with at least one further hardstoffkörperfreien layer based on a nickel-phosphorus Alloy is coated, and then the coated fitting ring is subjected to a heat treatment, wherein the heat treatment is carried out in a temperature range which is below the tempering temperature of the base material of the fitting ring. The base coat applied first serves as a carrier layer for the wear and corrosion protection layer of a nickel-phosphorus alloy to be applied in the subsequent process step, which is also referred to below as the nickel-phosphorus layer. A significant advantage of the nickel-phosphorus coating consists in the constant dimensional stability, that is, the uniform layer distribution on the surface of the fitting ring, which is achieved by dispensing with hard material body. It is achieved over the coating according to the prior art, a very uniform surface topography, which provides little resistance to the dissolving chemical fiber material. In addition to the corrosion resistance, the nickel-phosphorus coating so outstanding tribological properties with regard to friction and wear protection. The dissolving chemical fiber material therefore has less damage through the surface of the fitting ring, as in the prior art with conventional nickel-hard material coating

the case is. The waiver of the hard material body in the coating, which is achieved in the prior art, the wear protection of the fitting ring is made possible by the inventive method by the subsequent heat treatment is carried out below the tempering temperature of the base material of the fitting ring, whereby a high hardness of the surface is reached. In this case, a hardness increase to up to 1200 HV of the nickel-phosphorus layer can be achieved.

The heat treatment should be carried out at a temperature below 320 ° Celsius. In this way, a drop in hardness of the tip region of the fitting ring forming tear elements can be avoided. In addition, the occurrence of microcracks in the coating can be reduced, which increasingly occur due to the different coefficients of expansion of the base material of the clothing ring and the coating at temperatures above 320 ° C.

Advantageously, the heat treatment should be for a period of more than 3 Hours up to 6 Hours are performed to achieve the desired hardness of the surface of the fitting ring.

According to claim 4, it is proposed that the final heat treatment of the fitting ring is carried out in the absence of oxygen. The exclusion of oxygen during the heat treatment results in no discoloration of the clothing rings. The execution of the heat treatment in the absence of oxygen can be carried out, for example, under a protective gas atmosphere or in a vacuum oven.

Advantageously, the coating can be carried out with a total thickness of between 10 μm and 40 μm, preferably between

15 μm and 30 μm. The layer thickness to be applied depends on the stress and the application range of the fitting ring, in particular on the properties of the man-made fiber material to be dissolved.

In a development of the invention it can be provided that a second nickel-phosphorus layer is applied to the first nickel-phosphorus layer applied as the second layer, the application of which is carried out in a coating bath with identical parameters, such as the application of the first nickel-phosphorus layer. phosphor layer.

For application of the second nickel-phosphorus layer, the inner circumferential surface of the fitting ring can be covered after the application of the first nickel-phosphorus layer before the ring-shaped ring is again supplied to the coating bath to apply a second nickel-phosphorus layer. In this way, the coating of the inside of the fitting ring is avoided with another layer, so that in the arrangement of the fitting ring on a drive roller body by means of sliding or play fit the required fitting dimensions are maintained while the outer surface of the fitting ring with the desired Layer thickness of the wear layer is provided. By covering the inside of the fitting ring is achieved that the second nickel-phosphorus layer is applied only on the outside of the fitting ring, which comes into direct contact with the dissolving chemical fiber material.

In this case, the first nickel-phosphorus layer can be applied in a thickness between 5 .mu.m and 10 .mu.m. This is primarily the corrosion protection of the inside of the fitting ring, which is pressed onto the roll body.

According to claim 9, the second nickel-phosphorus layer in a thickness between 10 μm and 25 microns are applied. The application of the third layer in conjunction with the second layer, the required thickness of the wear protection layer of the fitting ring is achieved. According to claim 9 an attachment ring is proposed for an opening roller, the surface of which is provided with a coating having at least two layers, wherein the ring gear is provided with a base coating of a non-ferrous metal and at least one further hardstoffkörperfreien layer based on a nickel-phosphorus alloy. When processing synthetic fibers with a coating ring coated according to the invention, even under coarse yarns with yarn counts below Nm 14 achieved a stable spinning process while maintaining all the quality features of the spun yarn. The number of yarn breaks in the processing of chemical fibers can be significantly reduced compared to the use of sets of rings with a nickel-diamond coating.

The invention is explained in more detail with reference to an exemplary embodiment shown in the drawings.

• 1 eine Auflösewalze mit einem rotierbar gelagerten, zylindrischen Walzenkörper;
• 2 einen Garniturring im Schnitt.

Show it:

• 1 an opening roller with a rotatably mounted, cylindrical roller body;
• 2 a fitting ring in section.

The invention is explained in more detail with reference to an exemplary embodiment shown in the drawings. 1 shows an opening roller with a rotatably mounted, cylindrical roller body and a Sägezahngarnitur. In the 1 denoted by 1,

in a opening roller housing, not shown, rotating opening roller is basically known in connection with open-end spinning devices. The opening roller 1 has the task of disassembling a sliver fed to it via a feed roller into individual fibers. The individual fibers are then fed via a Faserleitkanal in a spinning member, such as a spinning rotor.

Such opening rollers 1 Run during the spinning process usually with speeds between 6000 and 12000 U / min.

The opening roller 1 has a bearing shaft 2 , on the end of a so-called Antriebswirtel 3 is fixed. The drive whorl 3 is acted upon during the spinning operation by a tangential belt, not shown. The bearing shaft is about roller bearings 4 rotatable within a bearing housing 5 stored. The bearing housing 5 is in turn set in a bearing bracket, not shown, of an opening roller housing and there via a securing element which the plastic ring 6 tangentially passed through, arrested.

Front side is on the bearing shaft 2 a roll body 7 arranged. The roll body 7 is non-rotatably via a press fit with the bearing shaft 2 connected. The roll body 7 has a cylindrical shape and has a flange on the back 8th on. The surface of the roller body 7 is preferably smooth. Front has the opening roller 1 over another flange 11 that, for example, about a bolt 12 and a compression spring 13 , with the bearing shaft 2 connected is.

On the surface of the cylindrical roller body 7 is either a direct one as a solid ring 30 executed fitting ring according to

of the 2 fixable or a saw tooth set 10 is on a support element 14 mounted, which is part of a fitting ring 17 are. The 1 shows the embodiment of a sawtooth 10 and the carrier element 14 formed fitting ring 17 , The front flange 11 fixes the sawtooth in the assembled state 10 on the roll body 7 , The sawtooth set 10 has a schraubfederartig shaped body 15 on, which may have different embodiments in cross section.

In the 1 illustrated sawtooth 10 is with the turns of her body 15 in a helical groove 9 of the carrier element 14 admitted. The main body 15 has an approximately rectangular cross-sectional shape. The determination of the basic body 15 in the groove 9 occurs positively or positively. The carrier element 14 is by sliding or clearance fit on the roll body 7 arranged, whereby a replaceability of the fitting ring 17 is reached. The sawtooth set 10 has a variety of tear elements 16 , each radially from the main body 15 protrude.

The representation in 2 shows a manufactured as a solid ring and, for example, made of steel fitting ring 30 consisting essentially of a tubular base body 31 with an annular centering shoulder 32 in the region of its inner diameter. As can be seen, the fitting ring 30 formed on its outer circumference as a ripping tool. In the area of the outer circumference of the fitting ring 30 are a variety of teeth 33 arranged by milling a circumferentially helical groove 34 as well as substantially parallel to the axis of rotation 35 running punctures 36 are formed.

The inventive method is based on the carrier element 14 the opening roller 1 according to the 1 described. The method is also in the same way on the ring formed as a solid ring 30 according to the 2 applicable. The carrier element 14 is provided with a multi-layer, chemically applied nickel-phosphor coating, which serves to protect against corrosion and wear. In accordance with the method according to the invention, at least two layers are thereby applied to the carrier element 14 of which the first applied layer is formed as a base coat and the at least one subsequent as a wear and corrosion protection layer.

Before the start of the coating process, the carrier element 14 subjected to treatment with a stain to remove oxide layers and to activate the passive surface. This will increase the reactivity of the surface by removing or chemically transforming inactive substance on the surface of the support member 14 reached. Activation of the surface of the carrier element 14 is a prerequisite for the subsequent coating process to ensure adequate wetting or adhesion of the coatings.

In the subsequent process step, a base coat of a non-ferrous metal such as nickel is applied, which is the carrier element 14 completely surrounds. The thickness of the base coat is between 0.5 μm and 3 μm. The applied primer coating is to be seen as a pure carrier layer for the subsequent coatings.

Subsequently, in a chemical bath at least a second layer, a nickel-phosphorus layer, which is the carrier element 14 completely surrounds, applied to the wear protection

serves. As the carrier element 14 on the roll body 7 the opening roller 1 should be applied to its inner circumference not too large coating thickness to be applied to the sliding fit on the roll body 7 comply with the required fitting dimensions. Therefore, the coating process is interrupted by reaching a layer thickness of the first nickel-phosphorus layer of about 5 microns to 10 microns and into the carrier element 14 a cover is introduced, which completely covers the inner surface. Following this, the carrier element 14 fed once more to the chemical bath to achieve the wear resistance layer thickness of the wear protection layer by applying an additional second nickel-phosphorus layer. The process of applying the second nickel-phosphorus layer to the first nickel-phosphorus layer takes place in the chemical bath while maintaining the bath parameters set for the application of the first nickel-phosphorus layer. The thickness of the third layer may vary between 10 μm and 25 μm depending on the degree of stress and the application. The selected concentration of the phosphorus in the nickel bath depends on the desired hardness of the surface. With increasing phosphorus content, a higher hardness of the surface can be achieved.

The completion of the coating process is followed by a heat treatment to achieve the curing of the still relatively soft nickel-phosphorus coating at this time.

This process takes place in an atmosphere with exclusion of oxygen, for example in a vacuum oven or under a protective gas atmosphere. In this case, the temperature is chosen below the tempering range of the support element to be cured, ie below 320 ° C, to avoid a drop in hardness in the region of the tips of the support element. At temperatures below 320 ° C, the desired hardness of the surface of the fitting ring 17 . 30 to achieve the heat treatment is carried out over a period of more than 3 hours to 6 hours.

Moreover, microcracks occur below this temperature, caused by the different coefficients of expansion of the nickel layer and the steel matrix, as is usual at temperatures above the tempering range. By the method according to the invention is a hardness increase of the surface of the fitting ring 17 . 30 reachable up to 1200 HV. In addition, the adhesive strength is increased because the compressive stress has been increased.

Claims (11)

Process for coating a clothing ring (17, 30) of an opening roller (1) for dissolving chemical fiber material onto which at least two layers are applied by chemical coating, characterized in that - the coating does not contain hard material, - that the clothing ring ( 17, 30) a first layer is applied as a base coat of a non-ferrous metal, - that on the base coat at least one further layer based on a nickel-phosphorus alloy is applied, and - that the coated fitting ring (17, 30) then a heat treatment is performed, wherein the heat treatment is carried out in a temperature range which is below the tempering temperature of the base material of the fitting ring (17, 30). Method according to Claim 1 , characterized in that the heat treatment is carried out at a temperature below 320 ° Celsius. Method according to one of Claims 1 or 2 , characterized in that the heat treatment is carried out for a period of more than 3 hours to 6 hours. Method according to one of Claims 1 to 3 , characterized in that the heat treatment is carried out in the absence of oxygen. Method according to one of Claims 1 to 4 , characterized in that on the first layer based on a nickel-phosphorus alloy, a second layer based on a nickel-phosphorus alloy is applied, whose application is carried out in a coating bath with identical parameters, such as the application of the first layer based a nickel-phosphorus alloy. Method according to Claim 5 , characterized in that the inner circumferential surface of Garningturres (17, 30) is covered after the application of the second coating before the ring gear (17, 30) is supplied to the coating bath again. Method according to one of Claims 5 or 6 , characterized in that the first layer is applied based on a nickel-phosphorus alloy in a thickness between 5 microns and 10 microns. Method according to one of Claims 5 to 7 , characterized in that the second layer is applied based on a nickel-phosphorus alloy in a thickness between 10 microns and 25 microns. An engaging ring (17, 30) for an opening roller (1) for dissolving chemical fiber material, the surface of which is coated with a coating comprising at least two layers according to the method of any one of Claims 1 to 8th is provided, characterized in that it has been dispensed in the coating on hard material body that the fitting ring (17, 30) has a base coat of a non-ferrous metal and at least one further layer based on a nickel-phosphorus alloy. Bite ring to Claim 9 , characterized in that the fitting ring is a solid ring (30). Bite ring to Claim 9 , characterized in that the fitting ring (17) has a carrier element (14) which is provided on its surface with a groove (9) for receiving a Sägezahngarnitur (10).

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