Automatic control method of tubular billet tail ring of perforating machine

A technology of piercing machine and capillary tube, which is applied in the direction of roll speed control, driving device for metal rolling mill, metal rolling, etc., can solve the problems of cutting the surface of the waste tube, defects of the capillary tube hole, and unavoidably scratching the surface of the mandrel, etc. Achieve the effect of meeting on-site production requirements and increasing rolling load

Active Publication Date: 2018-03-13
LINZHOU FENGBAO PIPE
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  • Abstract
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  • Claims
  • Application Information

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

Method used

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  • Automatic control method of tubular billet tail ring of perforating machine
  • Automatic control method of tubular billet tail ring of perforating machine
  • Automatic control method of tubular billet tail ring of perforating machine

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Embodiment Construction

[0020] In order to reduce the shaking of the plug and control the wall thickness of the head of the capillary, the speed of the roll after biting the steel is low. After a delay of T1, the speed is increased to the rolling speed at an acceleration of 100rpm / s, and the speed is -200rpm / s when it is close to the throwing of steel. The acceleration decelerates to the steel throwing speed. After a delay of 3 seconds after steel throwing, the roll speed returns to the steel biting speed. At the moment of throwing steel, the speed of the roll is low, which reduces the shear stress of the inner and outer layer metal and eliminates the iron ear at the tail. The speed curve of the piercer roll is trapezoidal, which is called "trapezoidal rolling", such as figure 1 shown. The acceleration time T1 and deceleration time T3 are set by the operation screen, see figure 2 .

[0021] When the roll bites the steel, the current of the piercing motor rises. When the current reaches 500A, the...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/04B21B37/46
CPCB21B19/04B21B37/46B21B2273/16B21B2275/04
Inventor 肖永忠宋箭平游成灿刘国庆高磊王文强付万昌
Owner LINZHOU FENGBAO PIPE
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