Device for skew rolling the tubular or rod shaped rolling piece

Abstract

The invention relates to a device for obliquely rolling a tubular or rod-shaped rolled piece, which comprises two or a plurality of driven rollers rotating around the longitudinal axis of the rolled piece. The axis of the roller obliquely extends in mode of an oblique angle relatively to the longitudinal axis of the rolled piece; in order to feed the rolled piece, the axis of the roller obliquelyextends in such a plane that the plane extends beside the longitudinal axis of the rolled piece by a radial distance in parallel when the plane is observed along the longitudinal axis of the rolled piece positively or negatively, a driving gear around the axis of each roller is meshed with a sun gear around the longitudinal axis of the rolled piece through a bevel gear tooth, the central line of the driving gear also extends in one plane of the longitudinal axis of the rolled piece, the driving gear meshed with the sun gear is provided with inner teeth in a hub area, outer teeth supporting each roller are meshed with the inner teeth, axes are staggered and supported relatively to the central line of the driving gear so that the axes obliquely extend in such a plane that the plane extends beside the longitudinal axis of the rolled piece by a radial distance in parallel when the plane is observed along the longitudinal axis of the rolled piece positively or negatively.

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

Images