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Chord pipe hot molding method and hot press molding mold used for spud legs of marine oil drilling platform

A drilling platform pile leg and offshore oil technology, which is applied in the field of offshore oil drilling, can solve the problems of workpiece oxidation, slow heating, decarburization, etc., and achieve the effects of reduced oxidation, regular shape, and accurate positioning

Inactive Publication Date: 2013-02-06
XIAN FLIT HEAT TREATMENT
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Problems solved by technology

[0003] However, gas furnace or electric resistance furnace has slow heating speed, long heating time, serious oxidation and decarburization of the workpiece, and grain growth, which may easily cause the mechanical properties of the chord to fail to meet the standard; due to the structural limitation of the open press, there are Inaccurate positioning of string pipe blanks, low precision of thermoforming geometry, low production efficiency, and low pass rate

Method used

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  • Chord pipe hot molding method and hot press molding mold used for spud legs of marine oil drilling platform
  • Chord pipe hot molding method and hot press molding mold used for spud legs of marine oil drilling platform
  • Chord pipe hot molding method and hot press molding mold used for spud legs of marine oil drilling platform

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Embodiment Construction

[0020] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0021] A thermoforming method for a chord tube used for pile legs of an offshore oil drilling platform, comprising the following steps:

[0022] 1) Carry out blanking of oxygen acetylene according to the size of the chord after forming, and obtain blank A;

[0023] 2) Using IGBT industrial solid state relay intermediate frequency induction heating unit (intermediate frequency induction heater installed vertically) to rapidly heat blank A. The heating temperature is 900°C-950°C, and the heating time is 1.5-2 hours to obtain blank B;

[0024] 3) The large-tonnage portal press is used for hot-press forming. The structure of the large-tonnage portal press is a frame type, and the hydraulic power is below it. For the thermoforming mold of the large...

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Abstract

The invention provides a chord pipe hot molding method and a hot press molding mold used for spud legs of a marine oil drilling platform. With the adoption of the chord pipe hot molding method and the hot press molding mold, the phenomena of oxidization, decarburization and grain growth in the chord pipe hot molding process are reduced. The positioning is accurate, the shape is regular, and the percent of pass can reach 100% during pressure molding.

Description

technical field [0001] The invention relates to the field of offshore oil drilling, in particular to a string tube thermoforming method for pile legs of an offshore oil drilling platform and a thermoforming mold. Background technique [0002] Existing thermoforming technology for chord tubes of elevating offshore oil drilling platforms, the heating method is gas furnace or resistance furnace heating, and the traditional open press is used for hot pressing. [0003] However, gas furnace or electric resistance furnace has slow heating speed, long heating time, serious oxidation and decarburization of the workpiece, and grain growth, which may easily cause the mechanical properties of the chord to fail to meet the standard; due to the structural limitation of the open press, there are The positioning of the chord blank is inaccurate, the geometrical precision of thermoforming is low, the production efficiency is low, and the qualified rate is low. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/02B21D37/10B21D37/16
Inventor 杨鸿飞王西临卢杞杨祯
Owner XIAN FLIT HEAT TREATMENT
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