High-precision and heavy-load three-roller cold rolling mill

Abstract

The invention belongs to the technical field of metal seamless pipe rolling and particularly relates to a high-precision and heavy-load three-roller cold rolling mill. The cold rolling mill comprisesa transmission mechanism, a connecting rod mechanism and a rolling main machine. An output shaft of a main motor is connected with an input shaft of a main speed reducer. An output shaft of the main speed reducer is connected with a first transmission main shaft. A first disc, a second disc, a third disc and a fourth disc which are the same are sequentially arranged in a transmission installing frame. The other end of the first transmission main shaft is connected with the middle portion of the first disc. The two ends of a second transmission main shaft are connected with the middle portion of the second disc and the middle portion of the fourth disc correspondingly. The first disc and the second disc as well as the third disc and the fourth disc are connected through transmission pin shafts arranged eccentrically. According to the cold rolling mill, by the adoption of combination of a heavy-load eccentric transmission manner, a multi-connecting-rod drive form and an overall rack structure form, the requirement for large-deformation and heavy-load rolling can be met, and the cold rolling mill is suitable for producing and preparing metal seamless pipes with large calibers and thick walls.

Description

technical field [0001] The invention belongs to the technical field of metal seamless pipe rolling, and in particular relates to a high-precision, heavy-duty three-roller cold rolling mill. Background technique [0002] Cold rolling of metal seamless pipes is one of the effective methods for producing high-precision and high-quality pipes. At present, the main structure of large-deformation cold-rolling equipment in China is a two-roll cold rolling pipe mill, which can realize the preparation of φ720mm metal seamless pipes. The roll cold rolling mill is a pair of rolls with continuously changing tapered grooves in cross-section, which can realize the rolling of metal pipes with large deformation. However, the frame of the two-roll cold rolling mill is a split structure, causing Deformation; the roll system is composed of upper and lower rolls, which causes the roll to deflect during the rolling process, the rigidity is insufficient, and the rolling mill equipment will suffer...

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Problems solved by technology

[0002] Cold rolling of metal seamless pipes is one of the effective methods for producing high-precision and high-quality pipes. At present, the main structure of large-deformation cold-rolling equipment in China is a two-roll cold rolling pipe mill, which can realize the preparation of φ720mm metal seamless pipes. The roll cold rolling mill is a pair of rolls with continuously changing tapered grooves in cross-section, which can realize the rolling of metal pipes with large deformation. However, the frame of the two-roll cold rolling mill is a split structure, causing Deformation; the roll system is composed of upper and lower rolls, which causes the roll to deflect during the rolling process, the rigidity is insufficient, and the rolling mill equipment will suffer from fatigue failure after long-term use, equipment stability, serious bouncing and other problems. In addition, due to the roll groove The difference in deformation and speed between the bottom and the side wall of the opening is large, resulting in poor pipe precision and frequent occurrence of uneven wall thickness during the rolling process, which reduces rolling precision, and the surface quality and roundness of the finished pipe are poor, and more serious It can even lead to defects such as scratches, slubs, and cracks on the pipe, which affects the production efficiency and product quality of the enterprise, and there are problems such as frequent equipment maintenance and high production costs.

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