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Self-elevating drilling platform spud leg semi-circular plate pressing method

A technology for drilling platform legs and semi-circular plates, which is applied in the field of semi-circular plate pressing for jack-up drilling platform legs, can solve problems such as the dependence of semi-circular plates on imports, and achieve the effect of ensuring dimensional accuracy

Active Publication Date: 2015-04-15
TIANJIN HOIDI OFFSHORE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no production capacity of semi-circular plate products in China, the semi-circular plate of the main chord pipe of the platform leg has been dependent on imports.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The inventors of the present application found that the main difficulty in the preparation of the semicircular plate is: not only to ensure the performance indicators, such as strength, low temperature impact toughness, elongation, etc., but also to ensure the dimensional accuracy requirements, while the thickness of the process object reaches 50mm, and the diameter is only 520mm, which belongs to large thickness and small diameter processing. When using the existing process of heating→forming→quenching→tempering to prepare the half-circle plate, since the process is to carry out the heat treatment of quenching and tempering after the half-circle plate is formed, although the mechanical properties of the half-circle plate can be improved, the formed The half-circle plate will be severely deformed and twisted, and the dimensional accuracy cannot be guaranteed. Therefore, how to meet the performance requirements through heat treatment and how to solve the springback and i...

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Abstract

The invention discloses a self-elevating drilling platform spud leg semi-circular plate pressing method which includes that a steel plate is put into a heating furnace and heated to 910-960 DEG C; the heated steel plate is moved to a water tank and put into water to be cooled to 180-200 DEG C; the cooled steel plate is heated to 600-650 DEG C; the steel plate is moved onto a pressing device fast to be hot-pressed to be formed, and a formed semi-circular plate is obtained; the formed semi-circular plate is heated to 600-650 DEG C; the formed semi-circular plate is moved onto the pressing device fast to conduct hot-pressing and forming. By means of a novel process and reasonable control of parameters of temperature, pressure, time of each link and the like, performance index of the semi-circular plate is guaranteed, internal stress is released, effects of springback and the internal stress which are generated after pressing on deformation are effectively removed, and size precision of the semi-circular plate is guaranteed.

Description

technical field [0001] The invention relates to a processing method for the legs of a jack-up drilling platform, in particular to a method for pressing a half-circle plate of the legs of a jack-up drilling platform. Background technique [0002] The main chord of the pile leg of the offshore jack-up drilling platform is one of the key components of the drilling platform, and the semi-circular plate, which is a component of the main chord, is the key component of the main chord of the pile leg. The reason why the half-circle plate is called a key part is that on the one hand, the processing of the half-circle plate is a part that is difficult to process and requires high precision in the manufacture of the main chord tube of the pile leg, and on the other hand, because of its harsh and complicated working conditions, the material and The mechanical performance requirements are very high. Since there is no production capacity of semi-circular plates in China, the semi-circula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/02C21D8/00
Inventor 董学勇吕明柯李增华
Owner TIANJIN HOIDI OFFSHORE ENG