DE3001959A1 - Roller installation for producing billets for tubes - has preload springs to reduce bearing wear - Google Patents

Abstract

The billets for making tubes, are produced by pushing ingots between groups of rollers (2) with concave profiles. Each roller (2) is mounted on a shaft (4) which runs in bearings (5) fitted in eccentric housings (6). The shafts (4) are pre-loaded by compression springs (10) acting on tension bolts (9) attached to bearings (7) fitted to the ends of the shafts. The tension bolts (9) are arranged so that they oppose the resultant of the forces exerted on the shafts (4) during the rolling of the billets. A constant load is thus maintained on the bearings (5) with a consequent reduction in wear.

Description

Description;

The invention relates to a push bench for the production of Rohrluppzn, in which a plurality of roller stands are arranged axially one behind the other, in those rotatably mounted rollers together form a}; aliberöffnuns.

In the known bumpers of this type, the bearings have the roles the usual bearing play in the radial direction, which changes over time due to of natural wear and tear.

It has been shown that with this game in the bearings of the roller frames the camps themselves, especially the WSlzlager used today, were prematurely destroyed will. One reason for the destruction of the rolling bearings is to be seen in the blinds the tubular blank suddenly loads the rollers in the radial direction with a high impact force and these shocks are transmitted to the roller bearings via the roller axles. Owns If the storage is the usual game, there are considerable abrupt movements and loads on the rolling bodies, the rolling bearing cages and the rolling tracks of the rolling bearing rings, which causes the high level of wear and tear.

The invention is based on the object of producing a StoSbank to create tube blanks in which the bearings of the rolls in the roll stands have a longer service life than the known types.

This object is achieved according to the invention in that both sides of the rollers, the roller axles carrying them are each enclosed by a bearing housing which is coupled with a tensile tie rod that supports the bearing housing, the roller axis, its storage and the roller itself in the radial direction, preferably in the direction of the force component resulting from the impact and rolling force is constantly loaded from the center of the caliber.

This ensures that the roles of the roller stands 1.1 direction the resulting force component from the impact and z z force and thus free of play are stored, so that the rollers do not abruptly hit in the radial direction after that, on the outside, removing the otherwise existing game play, must be pushed away can. As a result, the individual storage parts are no longer higher Strike each other forcefully, but only become firmly attached to each other Parts l, it is subjected to increased pressure, which significantly protects the rolling bearings will.

In the drawing, the invention is based on an exemplary embodiment shown. They show: FIG. 1 a roller frame of a push bench in a front view, partly in section; FIG. 2 shows a section along the line II-II in FIG. 1.

In Figure 1, 1 denotes a roller frame in which three roles 2 are arranged in a star shape and together form a caliber opening 3. The roles 2 are each pushed onto a roller axis 4, which is in roller bearings 5 is stored.

In order to enable employment, the roller bearings 5 are shown in the Embodiment introduced into eccentric bushes 6, which can be rotated in the roller frame 1 are stored.

On both sides of the rollers 2, the roller axles 4 each have a bearing housing 7, in which a roller bearing 8, preferably a needle bearing, between the LagergehSuse 7 and the roller axle 4 is arranged. In the outer surface of the bearing housing 7, a tie rod 9 is screwed in at one point on the circumference, which is supported by a helical compression spring 10 is enclosed. This is based on the one hand on the forehead surface the receiving bore 11 of the roll stand 1 and on the other hand on a collar of the tie rod 9. The latter is then from the center of the caliber marked 12 pulled away radially outward, being over the bearing housing 7 and the roller axis 4 also the roller 2 can be moved radially outwards, as far as the existing one Allow play between the individual parts of the storage, which is eliminated will. The roller bearings 5 are thereby constantly loaded with the force of the compression springs lo and are kept free of play in the radial direction.

In Figure 2 it can be clearly seen that the tie rods 9 are not perpendicular, but extend inclined to the vertical and their inclination corresponds to the direction which has the resulting force component from impact and rolling force.

Claims (1)

Push bench for the production of tubular blanks Patent claim: 1 push bench for the production of tube blanks, in which a large number of roller stands axially one behind the other are arranged0 in each of which several rotatably mounted rollers together one Form the caliber opening, which means that both sides do not of the rollers (2) the roller axles (4) carrying them each from a l.agergehsuse (7) are enclosed, which is coupled with a tensile-loaded tie rod (9, the bearing housing (7), the roller axle (4), its bearing (5) and the roller (2) even in the radial direction, preferably in the direction which the unc? Rolling force corresponds to the resulting force component, away from the center of the pass constantly burdened.