Control method of steel-tube online normalization

Abstract

The invention provides a method for controlling the on-line normalizing of a steel tube, which comprises the steps as follows: (1) a plurality of rollers for transmitting a roller way are divided into a first set of rollers and a second set of rollers, and the first set of rollers comprise the rollers provided with normalizing equipment; (2) the speed of the first set of rollers and the second set of rollers is set as V1, V1 is equal to the speed of the steel tube at a tensile reducer outlet, and a speeding up point and a speeding down point are sequentially arranged at the back of the normalizing equipment along the transmitting direction of the steel tube; (3) when the tail part of the steel tube arrives at the speeding up point, a signal is sent to a speed regulating device, and the speed of the second set of rollers is increased to V2; (4) when the tail part of the steel tube arrives at the speeding down point, or the front end of a following steel tube arrives at the speeding up point, the signal is sent to the speed regulating device, and the speed of the second set of rollers is reduced to V1; (5) for the following steel tube, the step (3) and the step (4) are repeated. Themethod can ensure that the steel tube passes the normalizing equipment at the stable speed and achieves good normalizing effect and the distance between the two steel tubes are lengthened.

Description

technical field [0001] The invention relates to a production method of steel pipes, in particular to a control method for online normalization of steel pipes. Background technique [0002] The production of fully floating mandrel seamless steel pipes has the characteristics of fast production rhythm, which can reach 4 pieces per minute at the fastest. The rolling of the steel pipe by the tensioning and reducing machine is the last process of the deformation of the diameter and wall thickness of the steel pipe in the production process of the seamless steel pipe. As shown in Figure 1, after the steel pipe 6 is rolled by the rolling machine in the stretching and reducing machine 1, it is transported to the conveying roller table 10. The conveying roller table 10 is composed of a plurality of rollers 3, generally between two adjacent rollers 3. The distance is 1m. The steel pipe 6 is subjected to primary and secondary material throwing through the throwing device, and only th...

AI Technical Summary

Problems solved by technology

However, if the conveying roller table is still running at the current speed, due to the action of the rolling machine, the speed of the steel pipe passing through the normalizing equipment before rolling is V 1 , the speed when passing through the normalizing equipment after rolling is V 2 , which causes the speed of the steel pipe to be unstable when passing through the normalizing equipment, which will affect the normalization effect of the steel pipe

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