A method for manufacturing a low-temperature heavy-duty high-performance climbing gear shaft

Abstract

The invention discloses a manufacturing method of a low-temperature, heavy-load and high-performance climbing gear shaft. The manufacturing method comprises the following steps: (A) an alloy steel blank is cut; and the cut alloy steel blank is forged; (B) the contour machining is performed on the alloy steel blank which is cooled to the room temperature, that is, rough turning and tooth rough milling contour machining are performed on the alloy steel blank to obtain a semi-finished product of a climbing gear shaft; (C) the semi-finished product is heated; and (D) semi-finish machining and finish machining are performed on the semi-finished product after heat treatment to obtain the low-temperature, heavy-load and high-performance climbing gear shaft. The cut alloy steel blank is forged; the alloy steel blank obtained through the forging mode is high in compactness and excellent in toughness; steel fibers form a certain uniform flowing mode; and after the semi-finished product is obtained through the contour machining, the heat treatment is performed, so that the mechanical performance of the semi-finished product is excellent, and such advantages as high strength, high ductility and high impact toughness under low-temperature environment (-40 DEG C) are still maintained.

Description

technical field [0001] The invention relates to the field of manufacturing offshore platform climbing gear shafts, in particular to a method for manufacturing a low-temperature, heavy-duty, high-performance climbing gear shaft. Background technique [0002] The lifting device is a key part of the jack-up offshore drilling platform, which is used to make the legs and the hull move up and down relative to each other, so that the main body of the platform can move up and down and fix it at a certain position of the legs. The rack-and-pinion lifting device uses a hydraulic motor to drive the climbing gear to realize the lifting of the pile legs. The climbing gear not only has to bear the huge load of the platform, but also has to be in the harsh offshore environment for a long time. Therefore, the climbing gear shaft is a key component of the climbing gear. Its manufacturing process High standard. [0003] However, the existing manufacturing process of climbing gear shafts, fir...

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Problems solved by technology

[0003] However, the existing manufacturing process of climbing gear shafts, first, adopts rolled steel, which is prone to poor density and large shrinkage cavities; second, it lacks heat treatment process, and the existing The mechanical properties of the climbing gear shaft are greatly reduced, resulting in brittleness and easy damage, and the replacement of the climbing gear shaft requires high maintenance costs; third, the existing climbing gear shaft is easy to break in a low temperature and heavy load environment, and there is a great potential safety hazard

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