Drawing roller, method for producing a drawing roller, and wire drawing machine

Abstract

The invention relates to a drawing roller, to a method for producing a drawing roller, in particular for a wire drawing machine, and to a wire drawing machine. According to the invention, the main body of the drawing roller is not coated and ceramic rings are also not placed on the main body, but coated steel rings are used instead of ceramic rings. The drawing roller according to the invention is thus a composite construction having only one or a plurality of coated components, whereas hitherto only all-steel constructions have been provided with a coating.

Description

[0001] 12 / 22 / 2025 PCT / DE0S£ / |ößffi124

[0002] • P05091 WO

[0003] 1 / 13

[0004] Drawing roller, method for manufacturing a drawing roller and wire drawing machine

[0005]

[0001] The invention relates to a drawing roller, a method for manufacturing a drawing roller, in particular for a wire drawing machine and a wire drawing machine.

[0006]

[0002] In a wire drawing machine, the wire to be drawn is typically guided through an opening in a so-called drawing die, which has a slightly smaller diameter than the diameter of the wire. The wire is then guided to a drawing roller and wound around the roller at a specific angle, preferably in several turns. The wire preferably runs in a circular groove on the surface of the drawing roller. In this way, the wire is placed under tension by the friction between the wire and the surface of the rotating drawing roller, and the diameter of the tensioned wire is slightly reduced as it is drawn through the opening of the drawing die. By connecting several drawing dies and drawing rollers in series, the overall wire diameter can be reduced to a desired value.

[0007]

[0003] In a multi-wire drawing machine, several wire sections can also be guided in parallel over the same drawing roller, preferably in separate circular grooves, thereby increasing the productivity of the machine accordingly. The present invention is not limited to the use of the drawing roller in either a single-wire or a multi-wire drawing machine.

[0008]

[0004] The drawing roller preferably has a cylindrical basic shape and features an axial bore, either through or as a blind bore. A drawing shaft can be inserted into this bore, which projects axially beyond the drawing roller at one or both ends and via which the drawing roller is driven during operation of the drawing machine.

[0009] CONFIRMATION COPY 22.12.2025 PCT / DE0S£^ / |ößffi124

[0010] • P05091 WO

[0011] 2 / 13

[0012]

[0005] To draw metals into wires using drawing rollers, galvanized steel base bodies are generally used which have a milled polygon inside to place the steel base body on a shaft of a drive and rotate it.

[0013]

[0006] At least one ceramic ring is placed on the steel base body as a sleeve, serving as a surface for a wire running on it. Usually, several ceramic rings are placed on top. Then, intermediate steel rings are placed between the ceramic rings.

[0014]

[0007] In practice, the base body has a flange and then a cylindrical section. A first ceramic sleeve is placed onto the cylindrical section, which then rests against the flange. Then a first steel ring is placed onto the cylindrical section of the base body, which then rests against the ceramic sleeve. Then another ceramic sleeve, a ring, and another ceramic sleeve are placed on top.

[0015]

[0008] Finally, a lid is placed on the base body and secured to it. The lid then rests against the ceramic sleeve. This stack is held together so tightly with a lid that neither the sleeves nor the rings can rotate relative to the base body. For this purpose, the steel lid can be screwed on and secured with a thread-locking compound.

[0016]

[0009] Such a drawing roller is known from DE 102015004 886 Al.

[0017]

[0010] When using such a drawing roller, the wire is placed in a groove or slot formed on the surface of the ceramic sleeve and guided around the drawing roller.

[0018]

[0011] There are also drawing rollers in which the steel base body is provided with a coating as a surface for a wire running over it. The coating of the base body is so hard that no ceramic sleeves are needed. The wire is then wound directly around the coated base body. Suitable coatings include...

[0019] 'P05091WO

[0020] 3 / 13 standardized industrial plasma coatings established as so-called VT6 coatings.

[0021]

[0012] Furthermore, there are drawing rollers in which a 0.5 mm thick metal layer containing molybdenum is applied to the base body, and a ceramic layer made of chromium dioxide is applied to this layer. Such a drawing roller is known from DE 43 17 363 A1.

[0022]

[0013] The invention is based on the objective of improving such drawing rollers.

[0023]

[0014] This problem is solved by not coating the base body of the drawing roll, nor by attaching ceramic rings to the base body, but by using coated steel rings instead of ceramic rings. The drawing roll according to the invention is thus a composite construction with only one or more coated components, whereas previously only solid steel constructions were provided with a coating.

[0024]

[0015] It was known to coat a base body or to first apply a coating and then a ceramic layer to sleeves. However, it had never been proposed to coat the sleeves in such a way that this coating could be used as the outer surface on which the wire runs. The invention is based on the realization that a coating can also perform the function of a ceramic surface on sleeves that are loosely placed on a base body.

[0025]

[0016] The coating can be made from various materials and material compositions. For this purpose, alloy mixtures (e.g., aluminum oxide and chromium oxide) can be used as a ceramic substitute, which have a Vickers hardness of HV 1250 to 1300. On the Mohs hardness scale, this corresponds to approximately 8 H to 10 H. A VT6 coating can also be used, which has a hardness of HV 920 to 1000. It is advantageous if the hardness of the coating is above HV 600. Coating hardnesses up to 1400 HV are practical. 22.12.2025 PCT / DE06)^ / |ößffi124

[0026] P05091WO

[0027] 4 / 13

[0028]

[0017] Depending on the intended use and coating material, different coating thicknesses can be used. A layer thickness of less than 0.5 mm and preferably even less than 0.4 mm is particularly advantageous for VT6 coating.

[0029]

[0018] The base body can be made of various materials and alloys. Different metals and composite materials are suitable for this purpose. It is advantageous if it is made of steel, in particular C45 steel. The material 1.0503 is also referred to as C45 steel and complies with DIN EN 10083-2 and the American standard AISI 1045. This is an unalloyed heat-treatable or structural steel characterized by a very uniform material structure.

[0030]

[0019] In particular, if the base body is made of steel, it is advantageous if the base body is protected against corrosion (e.g. galvanized).

[0031]

[0020] The drawing roller can have only one sleeve. However, depending on the application, it may be advantageous for it to have several coated sleeves and for at least one ring to be arranged on the base body, which is positioned between the coated sleeves.

[0032]

[0021] Thus, at least one ring is not necessary, and it is also possible to clamp only a sleeve between the flange of the base body and the flange of the cover. It is particularly advantageous if the sleeve is clamped in a self-centering manner. This sleeve can have a coating according to the invention, in particular also with ceramic, or can consist solely of a ceramic body.

[0033]

[0022] The at least one ring can be made of different metals and composite materials and is particularly preferably made of steel, especially C45 steel.

[0034]

[0023] In particular, the at least one ring can also be protected against corrosion (e.g., galvanized). 22.12.2025 PCT / DE0S£^ / |ößffi124

[0035] P05091 WO

[0036] 5 / 13

[0037]

[0024] The forces exerted by the wire on the sleeve cause a torque that could rotate the sleeve relative to the base body. Therefore, it is proposed that the sleeve be clamped by a cover screwed onto the base body in such a way that it does not rotate relative to the base body. Cumulatively or alternatively, an anti-rotation device can also be provided between the base body and the sleeve.

[0038]

[0025] It is particularly advantageous and essential to the invention even without the aforementioned features if a sleeve has inclined planes at its respective ends which interact with an inclined plane on a flange of the base body and an inclined plane on a flange of the cover to achieve self-centering of the sleeve on the base body.

[0039]

[0026] The problem underlying the invention is also solved by a method for manufacturing a drawing roller, in particular a drawing roller described above, in which at least one sleeve is placed on a base body and has a coating.

[0040]

[0027] Ultimately, the problem underlying the invention is also solved by a wire drawing machine with such a drawing roller.

[0041]

[0028] In particular, the problem underlying the invention is solved by a drawing roller according to claim 1, a method according to claim 10 and a wire drawing machine according to claim 11.

[0042]

[0029] An embodiment of a drawing roller according to the invention is shown in the drawing. It shows

[0043] Figure 1 shows a section through a drawing roller with only one sleeve,

[0044] Figure 2 shows another section through the drawing roller shown in Figure 1,

[0045] Figure 3 shows a view of a drawing roller with several sleeves and rings.

[0046] P05091WO

[0047] 6 / 13

[0048] Figure 4 shows a section through the drawing roller shown in Figure 3,

[0049] Figure 5 shows a detail of the drawing roller shown in Figures 3 and 4 and

[0050] Figure 6 shows a section through a drawing roller with improved self-centering.

[0051]

[0030] The drawing roller 1 shown in Figure 1 essentially consists of the base body 3, onto which the sleeve 5 is mounted, and a cover 12, which is screwed onto the base body 3. The screwed-on cover 12 clamps the sleeve 5 in such a way that it cannot rotate relative to the base body 3. The cover 12 has a fine thread with a fitting 13 to ensure precise centering of the cover in and on the base body.

[0052]

[0031] Accordingly, the drawing roller 2 shown in Figures 3 to 5 is constructed. This drawing roller has a base body 4 onto which several sleeves 6 to 9 are mounted. These sleeves are clamped to the cover 14 in such a way that they cannot rotate relative to the base body 4.

[0053]

[0032] Rings 15, 16, 17 are arranged between the several coated sleeves 6 to 9, bearing against projections 18, 19, 20 on the base body 4. The rings 15 to 17 have a mushroom shape in cross-section in order to bear slightly against the coating 11 of a sleeve 6 to 9, in order to hold the sleeves 6 to 9 in a defined position relative to the base body 4.

[0054]

[0033] The lid 14 then holds all coated sleeves 6 to 9 and rings 15 to 17 firmly to the base body, so that they do not rotate relative to the base body.

[0055]

[0034] A fine thread with fit 21 is also provided on the lid 14 to ensure precise centering of the lid in and on the base body.

[0056]

[0035] In the exemplary embodiments, steel sleeves 5 to 9 were used, which are provided with a coating 10, 11 with VH 600 to 1300. Also the 22.12.2025 PCT / DE0S£^ / |ößffi124

[0057] 'P05091WO

[0058] 7 / 13

[0059] Base bodies 3 and 4 are made of steel and protected against corrosion. Similarly, covers 13 and 14 are made of steel and protected against corrosion.

[0060]

[0036] The sleeves 5 to 9 have a meandering cross-section with projections 22 and depressions 23 (numbered for illustrative purposes only). The sleeves do not rest against the base body, and the rings 15 to 17 rest against the base body in the area of ​​projections 18 to 20 of the base body, with the rings 15 to 17 resting against the sleeves 6 to 9 in the area of ​​outer depressions provided on the sleeves.

[0061]

[0037] Figure 6 shows a self-centering mechanism with inclined planes 22 and 23 on the sleeve 24. The sleeve 24 is clamped between the flange 25 of the base body 26 and the flange 27 of the cover 28. As a result, when the cover 28 is screwed on, the sleeve 24 self-centers between corresponding inclined planes on the flange 25 of the base body 26 and on the flange 27 of the cover 28, by means of an inclined plane 29 on the base body 26 and an inclined plane 30 on the cover interacting with the inclined planes 22 and 23 of the base body.

[0062]

[0038] Such self-centering is also advantageous for uncoated sleeves.

Claims

12 / 22 / 2025 PCT / DE0S£^ / |ößffl124 P05091WO 8 / 13 Patent claims:

1. Drawing roller (1, 2) with a base body (3, 4) onto which at least one sleeve (5 to 9) is mounted as a surface for a wire running on it, characterized in that the at least one sleeve (5 to 9) has a coating (10, 11) as an outer surface on which the wire runs.

2. Drawing roller according to claim 1, characterized in that the coating (10, 11) has a hardness of more than HV 600.

3. Drawing roller according to claim 1 or 2, characterized in that the coating (10, 11) has a layer thickness of less than 0.5 mm and preferably even less than 0.4 mm.

4. Drawing roller according to one of the preceding claims, characterized in that the base body (3, 4) is made of steel, in particular C45 steel.

5. Drawing roller according to one of the preceding claims, characterized in that the base body (3, 4) is protected against corrosion.

6. Drawing roller according to one of the preceding claims, characterized in that it has several coated sleeves (6 to 9) and at least one ring (15, 16, 17) is arranged on the base body (4) which is arranged between the coated sleeves (6 to 9).

7. Drawing roller according to claim 6, characterized in that the at least one ring (15, 16, 17) is made of steel, in particular C45 steel.

8. Drawing roller according to claim 6 or 7, characterized in that the at least one ring (15, 16, 17) is protected against corrosion.

9. Drawing roller according to one of the preceding claims, characterized in that the sleeve (5 to 9) is screwed to the base body (3, 4) by a 12 / 22 / 2025 PCT / DE0S£^ / |ößffi124 'P05091WO 9 / 13 The lid (12, 14) is clamped in such a way that it does not twist relative to the base body (3, 4).

10. Drawing roller according to one of the preceding claims, characterized in that the sleeve (24) has inclined planes (22 and 23) at its respective ends which interact with an inclined plane (29) on a flange (25) of the base body (26) and an inclined plane (30) on a flange (27) of the cover (28) to achieve self-centering of the sleeve (24) on the base body (26).

11. Method for manufacturing a drawing roller (1, 2), in particular according to one of the preceding claims, in which at least one sleeve (5 to 9) is placed on a base body (3, 4) as a surface for a wire running on it, characterized in that the at least one sleeve (5 to 9) has a coating (10, 11) as an outer surface on which the wire runs.

12. Wire drawing machine with a drawing roller (1, 2) according to one of claims 1 to 9.

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