Device for skew rolling the tubular or rod shaped rolling piece

Abstract

The device has two rollers (2) for rotating around a rolling stock longitudinal axis (3). Roll axes (4) of the rollers extend under an inclination angle inclined to the longitudinal axis. A drive wheel is engaged with a ring gear over a bevel gear tooth system. A central axis of the wheel runs in a plane in which the longitudinal axis lies. A shaft carrying the rollers is supported at the central axis of the wheel such that the central axis runs in a plane that extends in or opposite to the longitudinal axis regarding to radial distance (E) parallel to the longitudinal axis.

Description

technical field [0001] The invention relates to a plant for cross-rolling tubular or rod-shaped rolling stock. Background technique [0002] Cross-rolling equipment is mainly used in the production of seamless tubes, for example, to perforate a circular billet and thereby produce a hollow tube blank with a thicker wall, or to stretch such a hollow tube blank to reduce its wall thickness, or Used for tube expansion. It is also known that such devices are also used for stretching and reducing the cross-section of rod-shaped, ie solid rolling stock. [0003] In conventional plants of this type, the rolling stock is formed while turning between rolls rotating in the same direction of rotation. In order to achieve continuous feeding of the rolled piece in the longitudinal direction, the axis of the roll is arranged at an offset angle relative to the longitudinal axis of the rolled piece, so a component along the longitudinal direction of the rolled piece is generated by the per...

AI Technical Summary

Problems solved by technology

Second, the rolling stock and possible internal molds require complex guides

Third, the flow rate of the rolling stock and thus the production capacity of the equipment is strictly limited

However, this also increases the rotational speed of the rolled piece, which leads to an unstable operation of the rolled piece, with the consequences of damage to the rolled piece, technical failure of the machine and increased wear

In addition, during rolling due to the higher roll speeds the workpiece must be accelerated more strongly, which leads to roll slippage and thus scratching problems

Fourth, the rolling stock rotating about its longitudinal axis prevents continuous finishing rolling in the downstream longitudinal rolling mill stands at short intervals.

The disadvantage of this structure is that it is necessary to have bevel gears with axes staggered

This can only be calculated and machined by a small number of highly specialized manufacturing plants, requiring special tools and correspondingly expensive production costs

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