Manufacturing method of low-temperature, heavy-load and high-performance climbing gear shaft

A manufacturing method and high-performance technology that can be used in manufacturing tools, furnace types, furnaces, etc., to solve problems such as hidden safety hazards, high maintenance costs for climbing gear shafts, and easy damage

Active Publication Date: 2018-06-12
KEEN OFFSHORE ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 grea

Method used

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  • Manufacturing method of low-temperature, heavy-load and high-performance climbing gear shaft
  • Manufacturing method of low-temperature, heavy-load and high-performance climbing gear shaft
  • Manufacturing method of low-temperature, heavy-load and high-performance climbing gear shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment B1

[0102] Embodiment B1 prepares the climbing gear shaft according to the following steps:

[0103] Step 1, intercepting the above-mentioned alloy steel billet, carrying out chemical composition spectrum analysis on the intercepted alloy steel billet, and carrying out metallographic inspection on the alloy steel billet, checking the segregation structure remnants and grain size of the alloy steel billet: if the alloy steel billet has no Mixed crystals exist, and the coarsest grain size is above grade 7, then the alloy billet passes the metallographic inspection;

[0104] Step 2. Profiling the alloy billet, that is, rough turning and rough milling tooth profiling of the alloy billet, after the rough turning of the alloy billet, ultrasonic flaw detection is performed on the alloy billet to control the The dimensional error of each part of the above-mentioned semi-finished product is obtained, so as to obtain the semi-finished product of the climbing gear shaft;

[0105] Step 3, he...

Embodiment B2

[0116] Embodiment B2 prepares the climbing gear shaft according to the following steps:

[0117] Step 1, intercepting the above-mentioned alloy steel billet, first carrying out chemical composition spectrum analysis on the intercepted alloy steel billet, and then forging:

[0118] (1.1) Heating the alloy billet to 1250°C and keeping it warm for 8.5h;

[0119] (1.2) performing rough forging on the alloy steel billet, wherein the start forging temperature of the rough forging is 1150°C, and the final forging temperature of the rough forging is 1100°C;

[0120] (1.3) Diffusion annealing treatment is performed on the alloy billet, wherein the heating temperature of the diffusion annealing is 1150° C., and the temperature is kept for 8.5 hours;

[0121] (1.4) Finish forging the alloy billet, wherein the start forging temperature of the finish forging is 1050°C, and the finish forging temperature of the finish forging is 1000°C;

[0122] (1.5) Carry out metallographic inspection t...

Embodiment B3

[0135] Embodiment B3 prepares the climbing gear shaft according to the following steps:

[0136] Step 1, intercepting the above-mentioned alloy steel billet, first carrying out chemical composition spectrum analysis on the intercepted alloy steel billet, and then forging:

[0137] (1.1) Heating the alloy billet to 1250°C and keeping it warm for 8.5h;

[0138] (1.2) performing rough forging on the alloy steel billet, wherein the start forging temperature of the rough forging is 1150°C, and the final forging temperature of the rough forging is 1100°C;

[0139] (1.3) Diffusion annealing treatment is performed on the alloy billet, wherein the heating temperature of the diffusion annealing is 1150° C., and the temperature is kept for 8.5 hours;

[0140] (1.4) Finish forging the alloy billet, wherein the start forging temperature of the finish forging is 1050°C, and the finish forging temperature of the finish forging is 1000°C;

[0141] (1.5) Normalize and heat the alloy steel bi...

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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...

Claims

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Application Information

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IPC IPC(8): B23P15/14C21D1/18C21D9/28C22C38/02C22C38/04C22C38/46C22C38/44C22C38/48C22C38/42
CPCB23P15/14C21D1/18C21D9/28C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 许正中邓达纮张静波杨清峡马振军吕明柯王冬石陈峰吴平平梁创
Owner KEEN OFFSHORE ENG CO LTD
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