Integral extrusion molding manufacturing method of truss-type leg chords of jack-up platform

Abstract

The invention discloses an integrated extruding, forming and manufacturing method for a truss-type pile leg chord of a self-elevating platform, in particular to a manufacturing method for a pile leg chord of the self-elevating platform, and belongs to the technical field of steel structure manufacturing in ocean engineering. The method comprises the following steps: firstly, determining the weight of a steel ingot material, namely, calculating the total weight of required steel materials according to the cross-sectional area of the pile leg chord to be manufactured; secondly, manufacturing a blank, namely, determining the weight of the blank requiring extruding by calculating after the length of the chord is determined; performing steel ingot thickening, steel ingot punching, ingot body lengthening and finishing; thirdly, preparing a mould, namely, pre-manufacturing an extrusion mould according to the shape of the required chord, wherein the moulds comprise an extrusion cylinder, a base plate, an extrusion mould, a mandrel and a male mould pressure head; fourthly, extruding integrally, namely, integrally extruding the manufactured blank material at a uniform speed on a 40,000-ton vertical press; fifthly, shaping and straightening; sixthly, quenching and tempering; seventhly, tooth machining, namely placing a finished chord on a flame cutting machine, and performing tooth cutting and machining according to a tooth form.

Description

technical field [0001] The invention relates to a method for integral extrusion molding of jack-up platform truss-type leg chords, in particular to a manufacturing method of jack-up platform leg chords, which belongs to the technical field of steel structure manufacturing in marine engineering . Background technique [0002] In recent years, with the increasing demand for offshore oil and gas development in my country, the demand for special equipment for offshore mobile oil and gas drilling is increasing. As a mobile equipment, the jack-up platform is widely used in offshore oil and gas drilling and exploration. As the main component of the jack-up platform, the pile legs are mainly used to support the platform's offshore operation and transfer the load on the platform to the seabed foundation. [0003] The main load-bearing structural parts of truss-type steel structures are usually thick-walled tubular structures. When the load-bearing capacity is large, in order to str...

AI Technical Summary

Problems solved by technology

At present, the traditional method of manufacturing leg chords in the world is to weld two semicircular plates and rack plates, and weld two semicircular steel pipes with a diameter of about 444mm and a thickness of about 83mm on the ultra-thick steel plate. Each chord needs at least Welding 4 full-penetration open-groove fillet welds, the welding workload is very large; since the rack plate and the semi-circular plate are ultra-thick steel plates, the welding shrinkage deformation is also very large, and the welding position needs to be constantly changed to ensure the welding shrinkage. Uniform and consistent, it will not affect the straightness, torsion and other precision requirements of the workpiece, which takes a long time, which reduces the welding efficiency; due to the structural strength and reliability requirements, in addition to strict 100% ultrasonic and X-ray non-destructive testing requirements, in During welding, it is also required that the material properties of the weld seam and heat-affected zone are not lower than that of the base metal, while deep penetration welding has a larger welding volume and a deeper molten pool, so the heat-affected zone is also larger, and has a greater impact on material properties. Large, in order to control the mechanical properties such as the strength of the material, low temperature impact toughness and hardness, various processes such as pre-weld preheating and post-weld heat preservation are required for the welded workpiece. At the same time, there are strict requirements on the temperature range and heat preservation time of preheating and heat preservation.

In short, high standards, high difficulty, complicated welding process and quality requirements bring risks to the guarantee of the entire manufacturing cycle

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