Dismounting device and method for seamless steel tube cold-rolling expansion-stop plug

Abstract

The invention relates to a dismounting device and method for a seamless steel tube cold rolling expansion-stop plug. The dismounting device comprises a workbench, a front baffle plate, a rear baffle plate, a jack, an end adjusting ring gasket, a front support, a rear support, a heating sleeve and a plug fixer. According to the disassembling method, through the continuous heating effect of saturated steam, and the function of axial displacement of the expansion-stop incarceration plug under the action of axial positive pressure is achieved through a trace gap formed by utilizing the differenceof different materials, diameters and heated expansion coefficients of the plug and the seamless steel tube. The method realizes nondestructive dismounting, is convenient in operation mode, is safe and reliable, and is practical and efficient.

Description

technical field [0001] The invention relates to seamless steel pipe processing equipment, in particular to a dismantling device and method for cold-rolled stagflation plugs of seamless steel pipes, especially suitable for plugs whose sizing section is between 25 and 110 mm and whose whole body is rolled and deformed Non-destructive disassembly of stagflation and incarcerated cold-rolled plugs wrapped in seamless steel pipes. Background technique [0002] Seamless steel pipes are common metallurgical metal products. The seamless steel pipe cold rolling technology has become the main method of seamless steel pipe production and preparation because of its high rolling precision, fast speed, large production capacity, high yield, and easy adjustment of production organization and process technology. The two-roller periodic cold-rolling mill is currently the most commonly used cold-rolling equipment for seamless steel pipes, and the cold-rolled plug is the main rolling deformati...

AI Technical Summary

Problems solved by technology

[0008] 1) Low operating efficiency: Since the seamless steel pipe wrapped by the stagflation and incarceration plug is processed by rolling deformation, the surface hardness is high due to cold hardening phenomenon, so in the turning process, the cutting speed and cutting amount are low. Usually, it takes more than 4 hours to turn a seamless steel pipe with a diameter of 63 mm, and it takes 7 hours to turn a seamless steel pipe with a diameter of 100 mm or more.

[0009] 2) Large consumption of tools: According to different materials of seamless steel pipes, turning tools of different materials are used. For high-alloy or ferritic seamless steel pipes, ceramic forming turning tools are used, and for low-alloy or austenitic seamless steel pipes, carbide turning tools are used. Knife

Due to the high surface hardness of the turned seamless steel pipe, the consumption of cemented carbide or ceramic tools used for turning is large. Usually, turning a low-alloy seamless steel pipe with a billet section diameter of 63mm requires 2 pairs of carbide turning tools. High-alloy seamless steel pipes with a section diameter of more than 100mm require three sets of ceramic forming turning tools, which increases the cost of turning processing

[0010] 3) Potential safety hazards: during lathe processing, the stagflation and incarcerated plugs and the seamless steel pipes wrapped outside are fixed on the lathe for high-speed rotation, and the surface-hardened seamless steel pipes are prone to tool jumping when they come into contact with the turning tool , causing fragments to scatter, and easily causing occupational hazards to operators

[0011] To sum up, although the cutting and turning method of stagflation and incarcerated plugs currently used for seamless steel pipes can meet the requirements of production technology, there are deficiencies in safety, efficiency, cost, etc., and it is urgent to improve the existing stagnation The non-destructive disassembly method of the bulging and incarcerated plugs is technically improved, and on the basis of ensuring the safety of the operation, the operation efficiency is improved, the production cost is reduced, and the goal of orderly production of seamless steel pipe cold rolling is met.

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