Automatic control method of tubular billet tail ring of perforating machine

Abstract

The invention provides an automatic control method of a tubular billet tail ring of a perforating machine. The automatic control method is characterized by comprising the following steps that 1, a perforating unit roller operates in a no-load speed state and is bitten into a pipe blank; 2, after time is delayed for T1, the speed is increased to the rolling speed at an accelerated speed I; 3, whenthe current pipe blank is rolled, high-speed rolling time T2 of the current tubular billet is calculated according to rolling time of a former steel pipe, and T2 is equal to T2 upper + (T3 upper-T3 setting)*V3 / V2; 4, in the steel polishing process, the speed is decreased to the steel polishing speed at an accelerated speed II; and 5, after steel polishing is completed, time is delayed for T4, andthe roller speed is restored to the steel biting speed. According to the method, the tubular billet tail ring after perforating is eliminated basically, and the problem that due to the tubular billettail ring, the surface of a core bar is damaged is solved basically. By the adoption of the automatic control program, the problem of the tubular billet tail ring generated by the perforating machinecan be well controlled, the technology can meet the site production requirement, and the effects on stability of the production quality and normal use of the core bar are remarkable.

Description

technical field [0001] The invention relates to the technical field of perforated capillary rolling production technology, in particular to an automatic control method for capillary tail ring of a perforating machine. Background technique [0002] Because the tube blank is subjected to circumferential shear strain, longitudinal shear strain, torsional shear strain, and the obstruction of the inner metal flow by the plug, at the end of cross-rolling piercing, when the plastic strength of the metal is lower than the shear stress of the inner metal At the same time, a crack occurs between the inner metal at the tail of the tube blank and the outer metal that drives it to flow, and the plug will take the inner metal that is close to the molten state out of the tube blank, resulting in iron ears. The iron lugs cool down faster and have higher hardness. During the subsequent process of inserting the mandrel into the capillary, the iron lugs will inevitably scratch the surface of t...

AI Technical Summary

Problems solved by technology

The iron lugs cool down faster and have higher hardness. During the subsequent process of inserting the mandrel into the capillary, the iron lugs will inevitably scratch the surface of the mandrel, and also scratch the surface of the roll during continuous rolling, and even cut the surface of the waste pipe, resulting in holes in the capillary defect

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