DE2854510A1 - Rolling down bars by means of conical rollers - which have circumferential longitudinal ridges to prevent slip - Google Patents

Abstract

The dia of a round bar is reduced by passing the heated bar between a group of conical rollers with their axes symmetrically inclined to the bar axis. The rollers are driven through a system of sun and planet gears. To prevent any slip between the rollers and bar circumferential ridges are formed on the conical surfaces together with a number of longitudinal ridges in the region where the bar is first engaged by the rollers. The region near the cone apex is left smooth to give a good finish to the bar.

Description

Inclined roller mill to reduce stretched goods

The invention relates to a cross rolling mill for reducing elongated Well, with the one on a hollow shaft that allows the rolling stock to pass through a driven roll carrier with inclined relative to the roll axis rotationally symmetrical work rolls are arranged, which are directed against the roll axis are, the work rolls preferably adjusting devices for the axial displacement assigned to the work roll shafts and driving the work roll shafts Planet gears rotating around the rolling stock axis are in engagement with a sun gear and a controllable and / or regulatable drive device is assigned to the sun gear and in which the work rolls have a deformation part and possibly a smoothing part.

Such a planetary piercing mill is from the German patent 16 02 153 known. The main advantage of this piercing mill is in it see that with a simply constructed scaffolding, which with relatively little effort can be created, strong cross-sectional reductions can be achieved in one pass. Another major advantage is that with this novel Planetary piercing mill Full strands and / or large length tubes can be reduced in cross-section, without the rolling stock rotating about its longitudinal axis. This is achieved by that an additional drive component is imposed on the sun gear.

This known device, which is essentially used for ochumformung of steel in a warm state in a wide range of dimensions, brings especially when forming non-ferrous metals in small dimensional ranges, in particular, if cold-formed, no optimal rolling results. So showed up on the The surface of the rolled strand has an undesirably strongly pronounced helical shape Surveys. In addition, the roller slipped due to excessive cross-section reductions in the last deformed areas very strongly on the rolling stock, so that a perfect Rolling stock quality could not be achieved.

The present invention is based on the object of the device of the type mentioned above to the effect that even with larger cross-sectional reductions the material to be rolled is gripped securely and a sump between the rollers and the Rolled stock is largely avoided.

This task is achieved by the fact that each work roll has at least one preferably mdir rC, has helical or ring-shaped projections in the inlet area. Because these projections are only arranged in the inlet area of the work rolls are, they cause penetration in the rolling stock only at the beginning of rolling into the rolling stock surface Deformations, which, however, are caused by the subsequent actual rolling area, in particular but be leveled again by the smooth part of the work rolls.

According to a further idea of the invention it is provided that at several projections the height of the projections to the larger diameter of the work rolls decreases towards. This measure makes it easier for the rolls to grip the rolling stock considerable. Furthermore, it is advantageous that the profile of the projections in cross section shows an obtuse triangle with different steep flanks and that the facing the flatter flank of the large truncated cone surface. By this measure a steep flank is created, which enables the rolling stock to be transported with virtually no slip allows in the longitudinal axial direction. The projections are expediently through machining such as turning generated.

But you can also use build-up welding and subsequent processing getting produced.

The projections can be distributed over the reduction area of the roller be or follow one another directly. The latter results in the inlet area a stepped or sawtooth-shaped roller contour.

It has also proven to be useful, in addition to the helical or a plurality of annular projections extending almost perpendicularly to these Provide surveys. These additional bumps prevent slippage between the rolls and the rolling stock in the circumferential direction. You will expediently go through Build-up welding applied to the roll surface.

The invention is shown schematically on the basis of FIGS. 1 and 2 Embodiments explained in more detail.

In the figure 1 is a work roll 1 of a planetary piercing mill according to DBP 16 02 153 in the left half as a section and in the right half shown as a view. The way in which the rolls are attached to the work roll shaft or the drive and the function of the trim rolls 1 are in the earlier application P 27 33 401 or the DBP 16 02 153 can be found.

So that the material to be rolled 2 is better gripped by the work rolls 1 can be and wil clel slip between the work roll 1 and the one to be rolled To reduce good 2, the work roll 1 points in the circumferential direction of the control jacket extending projections 3, which only in the first reduction area or inlet area 4 of the work roll i are arranged, while the further reduction area and the smoothing part 5 is free from these projections 3. About the slip between the work roll 1 and the material to be rolled 2 in the circumferential direction are also to be reduced Elevations 6 are provided which run in the direction of the surface line of the cone.

The height of the projections 3 increases from the smaller diameter of the work roll 1 towards the larger diameter. This is intended to ensure that the rolled material is gripped gently 2 are made possible.

FIG. 2 shows a projection 3 in section and in an enlarged manner Scale. According to a further concept of the invention, the projection is in the form of a acute-angled triangle formed with different steep flanks, the less steep flank in the direction of the larger diameter of the work roll 1 indicates. The reduction of the slip in the longitudinal axial direction of the rolling stock 2 occurs essentially through the steeper flank 7.

The elevations 6 are designed so that they are only between each two annular projections 3 are arranged.

Claims (6)

P a t e n t a n s p r ü c h e 1. Cross rolling mill to reduce elongated good, in which on one the passage of the rolled material possible hollow shaft driven roll carrier with inclined relative to the roll axis rotationally symmetrical work rolls are arranged, which are directed against the roll axis are, the work rolls preferably adjusting devices for the axial displacement are assigned to the work roll shafts and <11 e drive the work roll shafts To the Walzgutachs e rotating planet gears are in engagement with a sun gear and a controllable and / or regulatable drive device is assigned to the sun gear and in which the work rolls have a deformation and possibly a smoothing part, characterized in that each work roll (1) has at least one, preferably has a plurality of helical or annular projections (3) in the inlet area (4). 2. piercing mill according to claim 1, characterized in that that If there are several projections (3), the height of the fore rings (3) to the larger diameter the work rolls (1) decreases. 3. Cross rolling mill according to claim 1 or 2, characterized in that that the profile of the projections (3) in cross section with an obtuse triangle shows differently steep flanks and that the flatter flank of the large truncated cone surface is facing. 4. Cross rolling mill according to claim 1 or one of the following, characterized characterized in that the projections (3) are produced by machining, such as turning are. 5. Cross rolling mill according to claim 1 or one of the following, characterized characterized in that the projections (3) follow one another directly. 6. Cross rolling mill according to claim 1 or one of the following, characterized characterized in that in addition to the helical or annular projections (3) one A large number of elevations (6) extending almost perpendicular to these are provided.