Efficient straightening unit for small-bore thick-wall metal tubes

Abstract

The invention belongs to the technical field of metal straightening machines, and particularly relates to an efficient straightening unit for small-bore thick-wall metal tubes. The efficient straightening unit comprises a loading device, a feeding device, an entrance limiting device, a straightening host, a discharging device and a collection device, wherein the loading device is arranged on one side of the feeding device, and is used for conveying unbaled tubes to be strengthened to the feeding device; the feeding device, the entrance limiting device, the strengthening host and the discharging device are arranged in sequence; the feeding device is used for feeding the tubes to the strengthening host; the strengthening host is used for strengthening the tubes; the discharging device is used for moving the tubes strengthened by the straightening host out of a strengthening production line; and the collection device is used for collecting the tubes sliding down after strengthening. In the strengthening process, the contact areas between an upper strengthening roller and the tubes as well as between a lower strengthening roller and the tubes are large, so that the strengthening accuracy of the small-bore thick-wall tubes can be improved, and the residual stress distribution condition inside the small-bore thick-wall tubes is improved.

Description

technical field [0001] The invention belongs to the technical field of metal straightening machines, in particular to a high-efficiency straightening unit for small-diameter thick-walled metal pipes. Background technique [0002] At present, small-diameter thick-walled pipes are widely used in national life. Due to the large residual stress in the production process, the ellipticity and straightness of the pipes are poor, which greatly affects the subsequent deep processing. The traditional production method adopts multi-roller inclined arrangement for straightening, and there are many straightening units, and the pipes repeatedly undergo complex strain processes such as flattening and bending in the roll gap. However, due to the strong rigidity of small-diameter thick-walled pipes, it is easy The roundness straightening effect is not good, and because of the large diameter of the entrance part of the skewed roll neck and the small inclination angle of the roll, the small-di...

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Problems solved by technology

[0002] At present, small-diameter thick-walled pipes are widely used in national life. Due to the large residual stress in the production process, the ellipticity and straightness of the pipes are poor, which greatly affects the subsequent deep processing.

The traditional production method adopts multi-roller inclined arrangement for straightening, and there are many straightening units, and the pipes repeatedly undergo complex strain processes such as flattening and bending in the roll gap. However, due to the strong rigidity of small-diameter thick-walled pipes, it is easy The roundness straightening effect is not good, and because of the large diameter of the entrance part of the skewed roll neck and the small inclination angle of the roll, the small-diameter thick-walled pipe is easy to hit the guide roll during the biting process, and it is easy to cause the pipe to collide with the roll. Damage occurs, which affects product quality. In addition, due to the complex structure of the multi-roller straightening equipment, the equipment investment cost is high, the straightening process is complicated, and the maintenance cost is high.

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