EP2365114A1 - Method for producing a disintegrating roller housing of an open end spinning machine and disintegrating roller housing - Google Patents

Abstract

The method involves using a light metallic material for manufacturing the opening roller housing (17), where the opening roller housing has a circular opening roller receiver (31). Openings are arranged in the circumferential wall of the opening roller receiver. The opening roller housing is so impinged with a sand blast medium in a finishing process that the surfaces (33,35) of the opening roller receiver is micro compressed and supports a roughness which ensures that no adhesion forces occur in area of the surface during the operation of the opening roller housing.

Description

A method of manufacturing an opening roller housing of an open-end spinning apparatus and opening roller housing

The invention relates to a method for producing an opening roller housing of an open-end spinning device with the features of the preamble of claim 1 and an opening roller housing, which is produced by this method.

Opening cylinder housings for open-end spinning devices have long been known and described in detail in numerous patent applications.

By the DE 197 09 213 A1 For example, a sliver-opening device for an open-end spinning device is known, whose substantially rectangular opening roller housing is made of a lightweight metallic material and which has a circular opening roller receptacle.

In addition, the opening roller housing has a front wall and a rear wall, which form special air guide surfaces.

In addition, two openings are incorporated into the circumferential wall of the opening roller receptacle, wherein a first, relatively large opening serves to feed a sliver and to separate out dirt particles and also flows through this opening the spinning air required during the spinning process.

That is, the first opening has side air guide surfaces formed by the inside of the front wall and the inside of the rear wall of the opening roller case as seen in front view.

At a second, much smaller opening a so-called Faserleitkanal is connected, which connects the opening roller housing with the spinning rotor.

That is, during the spinning operation, the good single fibers combed out of the original roller belt by the opening roller emerge from the opening roller housing via the second opening and are fed into the spinning rotor via the fiber guide channel while dirt particles are discharged through the first opening.

Even if this is in the DE 197 09 213 A1 is not explicitly described, it has long been state of the art to manufacture such opening roller housing in the die-casting process.

That is, by means of a die-casting process, a blank is first created, which is then machined. In this mechanical processing, which is carried out, for example, as PCD machining, the opening roller housing is given its required dimensions.

In order to make the opening roller housing, especially the surfaces in the area of the opening roller holder, more resistant to abrasion, the opening roller housing also receives a coating with a chemical nickel layer and is finally tempered.

Such, made of a light metal material and provided with a chemical nickel layer opening cylinder housing have proven themselves in practice and are in open-end rotor spinning in large numbers in use. A disadvantage of these Auflösewalzengehäusen, however, are their relatively high production costs; In particular, the coating of the opening cylinder housing with a chemico-nickel layer makes itself negatively noticeable in terms of cost.

Based on the aforementioned prior art, the present invention seeks to develop a method that allows a more cost-effective production of high quality and very reliable opening cylinder housing.

This object is achieved by a method as described in claim 1.

Advantageous embodiments of the method according to the invention are the subject of the dependent claims 2-6.

The claim 7 relates to an opening cylinder housing, which is produced by the process according to the invention.

The method according to the invention, in which the dissolving roller housing is subjected to a sandblasting medium in a final treatment in such a way that at least the surface of the opening roller receptacle is microcompacted, thereby obtaining a relatively large roughness, has the advantage that it can be ensured in this way that during operation the dissolving roller housing in the region of the surface no harmful adhesion forces occur, so that it is ensured that within the opening roller receiving a proper transport of combed individual fibers can take place.

That is to say, the final treatment of the opening roller receptacle with a special sandblasting medium makes it possible in a relatively simple manner to prevent the occurrence of relatively strong adhesion forces on the surfaces of the opening roller receptacle due to the very low roughness values usual after PCD machining. that form deposits on the fiber-guiding surfaces of the opening roller housing.

So far, the occurrence of excessive deposits on the fiber-guiding surfaces could only be prevented by the fact that the opening roller housings were regularly cleaned at specific time intervals, depending on the particular soil of the cotton to be processed.

As described in claim 2, as sandblasting medium preferably a material is used which consists of spherical individual elements with a diameter between 1 .mu.m and 10 .mu.m.

By roughening the surface of the opening roller receptacle with a material consisting of spherical individual elements with a diameter between 1 .mu.m and 10 .mu.m, a relatively large, relatively uniform roughness of the treated surfaces can be realized, while reliably preventing the surface during The sandblasting process is changed so that a continuous single fiber transport is no longer guaranteed.

That is, such a sandblasting medium can ensure that the surfaces have roughness preventing the occurrence of adhesion forces, but no edges that would interfere with the transport of individual fibers.

As set forth in claims 3 and 4, can be used as advantageous sandblasting media, for example, ceramic balls or steel balls.

With such sandblasting media, the surface of the opening roller can be roughened in a final treatment in a relatively simple manner so that there are surfaces in the area of the opening roller, which are relatively insensitive especially against deposits.

In addition, the micro-compression of the surface occurring in such sandblasting media has a very positive effect on the stability of the opening roller housing.

As set out in claim 5, at least one roughness depth of the surface of the opening roller holder according to the sand blasting method according to the invention has a multiple of the roughness depth before the sand blasting method.

By achievable in the final treatment with the sandblasting method according to the invention, relatively large roughness is reliably prevented that it can occur during spinning due to adhesion forces on fiber-guiding surfaces of the opening roller housing to deposits, which is not only visually very ugly, but also disturbing the Fiber flow of the combed out and to the spinning rotor to be transported single fibers.

According to claim 6, it is further provided that the highly abrasion-prone tear-off edge arranged in the region of the opening roller receptacle behind the fiber outlet opening is secured against abrasion by sandblasting by a ceramic pin.

In this way, it is ensured that the highest-stressed area of the opening cylinder housing, which is provided in the entry region of the fiber guide channel at the so-called fiber tear-off edge, receives additional wear protection.

By using the method according to the invention, an opening roller housing can be provided which, as described in claim 7, characterized in that at least the opening roller receptacle has a micro-compressed surface with a roughness, which ensures that no adhesion forces occur in the region of the surface, so that It is ensured that in the area of the opening roller absorption a proper transport of combed single fibers is given.

Such an opening roller housing is not only advantageous because very reliable during operation, but also relatively inexpensive to manufacture.

Further details of the invention are shown in an embodiment explained below with reference to the drawings.

Fig. 1

in Seitenansicht eine Offenend-Spinnvorrichtung mit einer Faserbandauflöseeinrichtung, deren Auflösewalzengehäuse nach dem erfindungsgemäßen Verfahren hergestellt ist,

Fig. 2

ein nach dem erfindungsgemäßen Verfahren hergestelltes Auflösewalzengehäuse, in Vorderansicht.

It shows:

Fig. 1

in side view, an open-end spinning device with a sliver disintegrating device whose opening roller housing is produced by the method according to the invention,

Fig. 2

an opening roller housing produced by the process according to the invention, in front view.

The Fig. 1 shows in side view a generally designated by the reference numeral 1 open-end spinning device to which the opening roller housing 17 produced by the process according to the invention is used.

As can be seen, such open-end spinning devices 1 each have a rotor housing 2, in which a spinning rotor 3 rotates at high speed. The spinning rotor 3 is supported with its rotor shaft 4 in the gusset of a support disk bearing 5 and is acted upon by a machine-long tangential belt 6, which is employed by a pressure roller 7.

The rotor housing 2, which is open at the front, is in operation by a pivotably mounted cover element 8, in FIG the one (not shown) channel plate is incorporated with a seal 9, closed.

The rotor housing 2 is also connected via a corresponding vacuum line 10 to a vacuum source 11, which generates the necessary during the spinning operation in the rotor housing 2 spinning vacuum.

In the cover element 8, a preferably replaceable channel plate extension, a so-called channel plate adapter 12, embedded, which has the thread withdrawal nozzle 13 and the mouth region of the Faserleitkanales 14, wherein the Fadenabzugsdüse 13, a thread withdrawal tube 15 is connected. The lid member 8, which is rotatably mounted limited to the pivot axis 16 and rear bearing brackets 19, 20 for supporting the opening roller 21 and the sliver feed cylinder 22, an opening cylinder housing 17 is for example via bolts 18 and corresponding fitting means set.

The opening roller 21 is driven in the region of its whorl 23 by a rotating, machine-long tangential belt 24, while the drive (not shown) of the sliver feed cylinder 22 preferably via a worm gear arrangement, which is connected to a machine-length drive shaft 25.

The opening roller housing 17, which is described below with reference to FIG. 2 is explained in more detail during the spinning process by a closure lid 26 which is secured by a latch 27, closed at the front.

Below the opening roller housing 17 is also, as indicated, arranged a dirt removal device 30 through which the precipitated dirt particles are disposed of.

As in particular from FIG. 2 can be seen, the opening cylinder housing 17 has a circular opening roller receptacle 31, which has a double graduation 32 at its front.

In the rear surface 33 of the opening roller receptacle 31, a central bore 34 is incorporated, which is encompassed by the whorl 23 of the opening roller 21 in the assembled state.

The opening cylinder housing 17 also has a relatively large first opening 28 arranged in the direction of rotation of the opening roller behind the sliver feed cylinder 22, through which the dirt particles 29 released from the sliver are removed and the spinning air required during the spinning process is supplied. That is, the circular opening roller receptacle 31 is open to the surface of its peripheral wall 35 between the sliver feed point, which is visible through the bore 36 for the sliver feed cylinder 22, and a baffle 37 and forms in this area the so-called sliver inlet and dirt outlet opening 28th

In the surface of the peripheral wall 35 of the opening roller receptacle 31 also has a bore 38 is incorporated, which serves to receive a replaceable fixable Faserleitkanals 14 and 35 forms a second opening 39 in the region of the peripheral wall.

As can be seen, the opening roller housing 17 has a rectangular front side wall 43 and a rectangular rear side wall 44, wherein the side walls 43, 44 are each arranged substantially orthogonal to the axis 42 of the opening roller 21.

• Wie üblich, wird zunächst mittels eines entsprechenden Druckguss-Werkzeuges aus einem leichtmetallischen Werkstoff, beispielsweise einer Aluminiumlegierung, ein Auflösewalzengehäuse-Rohling hergestellt.

Dieser Auflösewalzengehäuse-Rohling wird anschließend einer mechanischen Bearbeitung unterworfen, bei der, wie bekannt, alle notwendigen Baumaße herausgearbeitet werden.The opening roller housing 17 further has a bearing bore 40 for the bolt 27 and threaded holes for fixing the opening roller housing 17 on the cover element eighth Method for producing the opening roller housing described above:

• As usual, an opening roller housing blank is first produced by means of a corresponding die-casting tool made of a light-metal material, for example an aluminum alloy.

This opening roller housing blank is then subjected to a mechanical processing in which, as is known, all the necessary dimensions are worked out.

The mechanical processing is preferably carried out by so-called PCD machining, that is, the cutting tools that are used are made of polycrystalline diamond. Such a PCD machining has the advantage that, in particular for larger quantities, a cost-effective and always very dimensionally accurate machining of opening cylinder housings is possible.

After mechanical machining of PCD, however, the machined surfaces of the opening roller housing, that is, in particular the surfaces of the opening roller receptacle and the air guide surfaces on the insides of the front and rear walls of the opening cylinder housing, have very small surface roughnesses, which entails the risk of damaging them During operation of the opening roller housing on these surfaces to the emergence of harmful adhesion forces and thus in this area comes to heavy dirt deposits.

$$\mathrm{Rz}\mathrm{=}\mathrm{0}\mathrm{,}61\mathrm{\mu m}\mathrm{,}$$

$$\mathrm{Ra}\mathrm{=}\mathrm{0}\mathrm{,}22\mathrm{\mu m}$$

und $$\mathrm{Rt}\mathrm{=}\mathrm{0}\mathrm{,}\mathrm{90}\mathrm{\mu m}\mathrm{.}$$

The surface roughness values of the surfaces of the opening roller holder are, for example, after PCD machining $$\mathrm{Rmax}\mathrm{=}\mathrm{0}\mathrm{.}\mathrm{84}\mathrm{microns}\mathrm{.}$$

$$\mathrm{March}\mathrm{=}\mathrm{0}\mathrm{.}61\mathrm{microns}\mathrm{.}$$

$$\mathrm{Ra}\mathrm{=}\mathrm{0}\mathrm{.}22\mathrm{microns}$$

and $$\mathrm{Rt}\mathrm{=}\mathrm{0}\mathrm{.}\mathrm{90}\mathrm{microns}\mathrm{,}$$

In order to increase these very low roughness depth values, the opening roller housings were previously sandblasted after the PCD processing and then chemically nickel-plated and tempered.

$$\mathrm{Rz}\mathrm{=}6\mathrm{,}45\mathrm{\mu m}\mathrm{,}$$

$$\mathrm{Ra}\mathrm{=}1\mathrm{,}04\mathrm{\mu m}$$

und $$\mathrm{Rt}\mathrm{=}8\mathrm{,}75\mathrm{\mu m}\mathrm{.}$$

Through this procedure, the surface roughness values of the surfaces could be increased to the following values: $$\mathrm{Rmax}\mathrm{=}\mathrm{8th}\mathrm{.}05\mathrm{microns}\mathrm{.}$$

$$\mathrm{March}\mathrm{=}6\mathrm{.}45\mathrm{microns}\mathrm{.}$$

$$\mathrm{Ra}\mathrm{=}1\mathrm{.}04\mathrm{microns}$$

and $$\mathrm{Rt}\mathrm{=}\mathrm{8th}\mathrm{.}75\mathrm{microns}\mathrm{,}$$

In contrast to the procedure described above, in the method according to the invention after the PCD machining, a final treatment of the opening roller housing (17) by the sandblasting method according to the invention takes place immediately.

That is, the opening roller housings (17) are immediately subjected to a sandblasting process with a special sand blasting medium after the PCD machining.

Sandblasting media which consist of spherical individual elements whose diameter is between 1 μm and 10 μm are preferably used in this sandblasting process.

That is, by the sandblasting method with ceramic balls or steel balls, at least one of the roughness depths of the surfaces of the opening cylinder housing (17) at risk of contamination is raised to a multiple of the roughness depth before sandblasting.

The surfaces (33, 35) of the opening roller receptacle (31), the surfaces of the air guide surfaces (44, 45) and the surface of the baffle surface (37) are to be regarded as surfaces of the opening roller housing (17) which are at risk of soiling.

$$\mathrm{Rz}\mathrm{=}9\mathrm{,}99\mathrm{\mu m},$$

$$\mathrm{Ra}\mathrm{=}1\mathrm{,}46\mathrm{\mu m}$$

und $$\mathrm{Rt}\mathrm{=}12\mathrm{,}90\mathrm{\mu m}\mathrm{.}$$

After the sandblasting process with one of the sandblasting media described above, the roughness depth in the area of the surfaces (33, 35, 44, 45, 37) is, for example: $$\mathrm{Rmax}\mathrm{=}12\mathrm{.}06\mathrm{microns}\mathrm{.}$$

$$\mathrm{March}\mathrm{=}9\mathrm{.}99\mathrm{microns}.$$

$$\mathrm{Ra}\mathrm{=}1\mathrm{.}46\mathrm{microns}$$

and $$\mathrm{Rt}\mathrm{=}12\mathrm{.}90\mathrm{microns}\mathrm{,}$$

This relatively large surface roughness reliably prevents deposits from being formed on the fiber-guiding surfaces of the opening roller housing during spinning due to adhesion forces, which is not only visually very unattractive, but also has a disruptive effect on the fiber flow.

By roughening the surface of the polluting areas of the opening cylinder housing with, for example, ceramic balls, not only a relatively large, but uniform roughness of the treated surface is achieved, but there is also a micro-compression of the surface. At the same time, however, it is reliably prevented that the surfaces will be torn open during the sandblasting process in such a way that the single-fiber transport is impaired.

Furthermore, such a micro-compression of the surfaces also has a very positive effect on the stability of the opening roller housing.

Claims (7)

A method for producing an opening cylinder housing an open-end spinning device, which is made of a lightweight metallic material and has a circular opening roller receptacle, in the peripheral wall openings are arranged, wherein by die casting process first, a raw form of the opening roller housing is created and the raw form is then processed mechanically in that the opening roller receptacle and the openings correspond to predetermined dimensions,
characterized,
in that the opening roller housing (17) is subjected to a sandblasting medium in a final treatment in such a way that at least the surface (33, 35) of the opening roller receptacle (31) is microcompacted, thereby obtaining a roughness which ensures that during the operation of the opening roller housing (17) no adhesion forces occur in the region of the surface (33, 35), so that it is ensured that a proper transport of combed individual fibers can take place within the opening roller receptacle (31). A method according to claim 1, characterized in that the sandblasting medium is a material used, which consists of spherical individual elements with a diameter between 1 micron and 10 microns. A method according to claim 2, characterized in that come as a sand blasting medium ceramic balls used. A method according to claim 2, characterized in that come as a sand blasting medium steel balls used. A method according to claim 1, characterized in that at least one of the roughness depths (Rmax, Rz, Ra, Rt) of the surface (33, 35) of the opening roller receptacle (31) after sand blasting a multiple of the roughness (Rmax, Rz, Ra, Rt) the surface (33, 35) before sandblasting is. A method according to claim 1, characterized in that in the region of the opening roller (31) behind a fiber outlet opening (39) arranged, highly abrasion-prone tear-off edge after sand blasting by a ceramic pin (45) is secured. Opening roller housing (17) of an open-end spinning device (1), which is made of a lightweight metal material and has a circular opening roller receptacle (31), characterized
in that at least the opening roller receptacle (31) has a micro-compressed surface (33, 35) with a roughness which ensures that no adhesion forces occur in the area of the surface (33, 35), so that it is ensured that in the area of the opening roller receptacle (31) a proper transport of combed individual fibers can take place.

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