Cold-rolling mill

Abstract

The invention relates to a cold-rolling mill, a frame contained in the cold-rolling mill is provided with a guiding device, a work frame thereon is provided with a power base, a support track and a roller box with a work roller therein, a driving device for moving the power base back and forth is also provided. A replaceable pressing mold contained in the roller box is provided with a rolling groove with gradually-changed circumference section, two ends of the rolling groove are provided with a feeding and overturn opening. the rolling groove is connected on the base surface of the pressing mold at a certain angle which can be changed with the change of the diameter range of the mill, thus guaranteeing the expanding state of the rolling groove with the feeding and overturn opening at bothends in the moving range of the roller box. For the synchronous movement of the power base and the roller box, a double-arm pull rod is provided, the double-arm pull rod is connected with the power base by a connecting rod and an additional connecting rod, and is connected with the roller box by a length-fixed connecting rod. The connecting rod of the power base has fixed length. According to theinvention, the quality of the rolled tube can be improved, the operation of the cold-rolling mill can be simplified, the work reliability can be improved, and the service life can be prolonged.

Description

technical field [0001] The invention relates to the field of rolled pipe production, in particular to a cold-rolled pipe mill for large-scale steel pipes. Background technique [0002] Known working frame of cold rolling mill, see Russian Federation Patent No. 2088353, B21B21 / 00, application date: June 8, 1992, publication date: August 27, 1997. Consists of a drive base with supporting rails for movement, a die with rolling grooves with progressively changing circumferential cross-sections and controlled by a movable roll box, a lever drive with a double-arm drawbar via a fixed-length drawbar and The mobile roller box is connected to the power base through a pull rod with variable length. [0003] The disadvantage of this structure is that it is necessary to manually change the length of the pull rod of the power base to adjust the expansion state of the rolling groove within the range of the moving length when the die moves in the cold rolling mill, which not only makes th...

AI Technical Summary

Problems solved by technology

[0005] The structural disadvantage of this known cold-rolled pipe mill is that in order to adjust the unfolded state of the die rolling groove with the feed and overturn opening, it is necessary to manually change the power base connecting rod within the length of the roll box movement on the production line of the cold-rolled pipe mill. length

Because the adjustment process is very complicated, the accuracy of the adjustment is not high

As a result, the quality of the rolled pipe is reduced, the use of the cold-rolled pipe machine is complicated, the work reliability is poor, and the service life is short

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