DE102012110158B3 - Gear blank for bearing rotary drum, has annular binding and radially extending bar which are joined together with friction welds - Google Patents

Abstract

The gear blank has a main portion whose diameter is set to 3m. The main portion is provided with an annular binding (1) and a radially extending bar (2). The cross-section of assembled annular binding and radially extending bar is formed in T, L or U shape. The annular binding and radially extending bar are joined together with friction welds (4,5).

Description

The invention relates to a race for mounting a rotary drum, wherein the raceway has a diameter of at least 3 m and is composed of at least one annular bandage and at least one radially extending web, so that a T, L or U-shaped cross-section results. Furthermore, the invention relates to a sprocket blank with a diameter of at least 3 m, which is composed of at least one annular bandage and at least one radially extending web, so that a T, L or U-shaped cross-section results.

Running rings are used, for example, in peripheral ball mills or other rotary drums, with a Gleitschuhlagerung is used, which has bearing segments on which the race of the rotary drum is supported. Between hydrostatic and hydrodynamic a lubricating film is built up between bearing segment and raceway. The races have a finely machined cylindrical surface on the outside for this purpose.

The cross-sectionally usually T-shaped races consist of a rotating bandage and a web, which are connected to circumferential welds. The preparation of these welds, however, is very time consuming and requires a high production cost and an accurate temperature control. Since the parts to be joined must be preheated, a high energy input is also required.

Large sprocket blanks require a very similar effort when joining radial web and ring bandage. Instead of the finely machined cylindrical peripheral surface teeth are provided at the sprocket blank on the opposite side of the web of the annular bandage.

From the DE 76 20 222 U It is known to produce the end wall of a rotary drum from a hollow pin and a forehead bottom, wherein the forehead bottom is formed by a flat circular disk with which an annular stiffening is in communication. In this case, the individual end wall elements can be connected to each other by welding and / or screw.

By the DD 115 188 A1 It is also known to connect wheel rims and similar parts with shafts on discs on friction welding machines. In this case, a perforated disc is pushed onto a stepped shaft, the bore has a slope corresponding to the slope of the shaft stage.

From the DE 20 2004 009 909 U1 Furthermore, a friction welding machine is known, which has two spindle heads, each with a workpiece holder, wherein for at least one workpiece holder a compression force supporting the bridge is provided.

http://www.bechteler.com/02_pages/01_referate/reibschweissen/reibschweissen.html Finally reports on a practical seminar "The Reibschweissen" at the FH Augsburg. According to this, in the case of steel, the component geometry to be welded is limited to 250 mm for full cross sections and to 900 mm (for 6 mm wall thickness) for hollow cross sections.

The invention is based on the object, the manufacturing cost of races or sprocket blanks with a diameter of at least 3 m, especially in terms of manufacturing times to reduce significantly.

According to the invention, this object is achieved by the features of claims 1 and 2 by the at least one annular bandage and the at least one web are connected to one another with a friction-welded connection.

Although the method of friction welding is well known in smaller rotationally symmetrical parts, it has never been used in the manufacture of large races or sprocket blanks. The otherwise necessary in a weld joint preparations, such as machining of the individual parts or preheating the parts to be joined are no longer required by the Reibschweißverbindung, so that the production times for such large races and sprocket blanks from several weeks to a few minutes are reduced. Furthermore, there is a significant energy savings by eliminating the preheating of the weld. In addition, for the annular bandage and webs and different materials, such as wear materials, malleable steels, materials with different hardnesses or strengths or alloy components can be used, which can not be welded with conventional welding technology.

Further embodiments of the invention are the subject of the dependent claims.

According to a further embodiment of the invention, the wall thicknesses of ring bandage and web are 25 to 300 mm. To avoid voltage peaks, a circumferential rear turn or a peripheral weld seam can be attached to the joint of the ring bandage and the bridge.

Depending on the application, the bridge may also extend radially inwardly or outwardly from the annular bandage. For races, the bridge is usually mounted on the inside. When toothed ring blanks both variants are conceivable to manufacture internal or external gears.

In the case of an L-shaped cross section, the web can be fastened on an axial end face of the annular bandage. In a U-shaped cross-section radially extending webs are attached by friction welding on both axial end faces. According to a further embodiment, the annular bandage may also consist of two parts, which are each friction-welded on opposite sides of the web with this.

In a particularly advantageous embodiment of the invention, the connection point to ring bandage and web are conical. This results in the friction welding an automatic centering.

Further advantages and embodiments of the invention are explained in more detail below with reference to some exemplary embodiments illustrated in the drawing.

In the drawing show

1 1 is a schematic sectional view of a T-shaped race with two annular band bearing parts and radially inwardly directed web,

2 an enlarged view of the detail X of the 1

3 a schematic sectional view of a T-shaped race with welds,

4 a schematic sectional view of a T-shaped race with a conical joint,

5 a schematic sectional view of a T-shaped race with two Ringbandagenteilen and radially outwardly directed web,

6 a schematic sectional view of an L- or U-shaped race with radially outwardly projecting webs,

7 a schematic sectional view of an L- or U-shaped race with radially inwardly projecting webs,

8th a detailed sectional view of a race for a ball mill, which is attached to one side of a mill cylinder,

9 3 is a detailed sectional view of a ball mill raceway connected to a mill cylinder on both sides;

10 FIG. 2 a schematic sectional view of a toothed rim blank with a web extending radially inward, FIG.

11 1 is a schematic sectional view of a toothed rim blank with a web extending radially outward,

12 a schematic representation of a friction welding device for manufacturing a race.

It should be noted that the drawings are not to scale, so in particular the diameters of web and ring bandage are shown greatly shortened. The illustrated races or sprocket blanks, for example, have a diameter of 3 to 14 m. The wall thicknesses of the ring bandages and webs can be in particular 25 and 300 mm.

The in 1 shown race consists essentially of a two parts 1a . 1b composite ring bandage 1 and a radially inwardly extending web 2 , which together give a T-shaped cross-section. The race is rotationally symmetric about an axis 3 educated. Between the two parts 1a . 1b the ring bandage and the radial web 2 are friction welded joints 4 . 5 intended.

To avoid voltage peaks between ring bandage 1 and footbridge 2 (see detail X of the 1 ) a circumferential back turn 6 be provided as in 2 is shown. Alternatively, according to 3 for this purpose also circumferential welds 7 . 8th be provided.

In the embodiment according to 4 is a one-piece ring bandage 11 via a friction-welded connection 9 with a radial web 19 connected. The connection points 19a . 11a of web and ring bandage are in the field of Reibschweißverbindung 9 conical. In this way results in the relative rotation during the friction welding an automatic centering of the two components.

The embodiment according to 5 essentially corresponds to the embodiment according to 1 , wherein the ring bandage 1' also from two parts 1'a . 1'b which is connected to a radial web 2 ' are mounted by friction welding. While the radial bridge 2 in 1 extends inward, the jetty protrudes 2 ' in the embodiment according to 5 from the ring bandage 1' radially outward.

6 shows a variant of the race with L-shaped cross section, wherein a web 20 on an axial end face of a ring bandage 10 is secured by friction welding. Such a raceway can by attaching another bridge 18 be formed on the opposite axial end face as a cross-sectionally U-shaped raceway. While the jetties 20 respectively. 18 in the embodiment according to 6 extend radially outwards, shows 7 a variant in which the radial webs 20 ' respectively. 18 ' from the ring bandage 10 ' extend radially inward.

In 8th is a section of a mill cylinder 12 dargstellt with attached race, the race here according to the embodiment 1 equivalent. Again, the connection between the race, ie the part 1b the ring bandage and the mill cylinder 12 by a friction welding connection 13 realized. The race forms here the conclusion of the mill cylinder 12 which is intended for example for a ball mill. The raceway can also be between two cylinder sections 14 . 15 by friction welding 16 . 17 to be ordered.

The outer peripheral surfaces of the previously described annular bandages are processed in a suitable manner, in order to be able to interact with a Gleitschuhlagerung, as it is known, for example, in circumferentially mounted ball mills.

10 shows a sprocket blank with a diameter of at least 3 m, consisting of a ring bandage 21 and a radially inwardly extending web 22 composed so that a T-shaped cross-section results. The ring bandage 21 again consists of two parts 21a . 21b together, each on opposite sides of the bridge 22 by friction welding 24 . 25 associated with this. After the connection of ring bandage 21 and footbridge 22 become the teeth on the outer peripheral surface 23 milled in parallel to the axis 26 run.

According to the embodiment 11 it is an internally toothed ring gear blank whose radial ridge 22 ' yourself from the ring bandage 21 ' , which in turn consists of two parts 21'a . 21'b exists, extends radially outward.

12 shows the basic structure of a friction welding machine, which can also be aligned vertically in addition to the horizontal arrangement shown here. Shown is the situation for creating the Reibschweißverbindung between the web 2 ' and the part 1'b the ring bandage 1' according to the embodiment of the 5 , For this purpose, the annular disc-shaped web 2 ' on a fixed faceplate 27 supported. The part 1'b the ring bandage 1' is on a rotating faceplate 28 supported. During the friction welding process, the fixed web comes 2 ' with the rotating part 1'b in contact with a certain form. Due to the relative rotation of web 2 ' and part 1'b Frictional heat arises, which rises to the welding temperature. Then the rotation is stopped and the bridge 2 ' and the part 1'b be pressed against each other by a joining pressure, which is above the form, wherein the pressure is maintained for a certain time. This results in a full-fledged weld, which in the mechanical sense is to be regarded as a full connection. After that, the other part becomes 1'a on the opposite side of the jetty 2 ' friction welded in the same way.

Of course, it is within the scope of the invention also conceivable that the face plate 27 is rotated, the direction of rotation opposite to the direction of rotation of the part 1'b is. Finally, it would also be conceivable that only the face plate 27 turns while the part 1'b not rotated and only against the bridge 2 ' is pressed.

Claims (10)

Race for supporting a rotary drum, wherein the race has a diameter of at least 3 m and consists of at least one ring bandage ( 1 . 11 ) and at least one radially extending web ( 2 . 19 ), so that a T, L or U-shaped cross-section results, characterized in that the at least one annular bandage ( 1 . 11 ) and the at least one bridge ( 2 . 19 ) are connected to each other with a Reibschweißverbindung. Sprocket blank with a diameter of at least 3 m, consisting of at least one ring bandage ( 21 ) and at least one radially extending web ( 22 ), so that a T, L or U-shaped cross-section results, characterized in that the at least one annular bandage ( 21 ) and the at least one bridge ( 22 ) are connected to each other with a Reibschweißverbindung. Running ring or toothed rim blank according to claim 1 or 2, characterized in that the wall thickness of the ring bandage ( 1 ; 21 ) and the bridge ( 2 ; 22 ) Is 25 to 300 mm. Running ring or toothed rim blank according to claim 1 or 2, characterized in that at the junction of ring bandage ( 1 ) and bridge ( 2 ) a circumferential back turn ( 6 ) is provided. Running ring or toothed rim blank according to claim 1 or 2, characterized in that the web ( 2 ) of the ring bandage ( 1 ) extends radially inwardly. Running ring or toothed rim blank according to claim 1 or 2, characterized in that the connection points ( 11a . 19a ) on ring bandage ( 11 ) and bridge ( 19 ) are conical. Race or ring gear blank according to claim 1 or 2, characterized in that the web ( 10 . 10 ' ) is mounted on an axial end face of the ring bandage. Race or ring gear blank according to claim 1 or 2, characterized in that two radially extending webs ( 20 . 18 ) are provided, each with one of the two axial end faces of the annular bandage ( 10 ) are friction welded. Running ring or toothed rim blank according to claim 1 or 2, characterized in that the annular bandage ( 1 ) of two parts ( 1a . 1b ), each on opposite sides of the bridge ( 2 ) are friction welded to this. Running ring according to claim 1, characterized in that the at least one web ( 2 '; 22 ' ) of the ring bandage ( 1'; 21 ' ) extends radially outward.

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