Planet carrier casting material used for self-elevating offshore platform lifting gear box and production method

Abstract

The invention relates to a large-ratio and large-torque planet carrier steel casting material used for a self-elevating offshore platform lifting gear box and a production method. The material comprises the following chemical components in mass by percentage: 0.28 to 0.35 percent of C, 0.20 to 0.35 percent of Si, 0.65 to 0.85 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.030 percent of P, 0.85 to 0.95 percent of Cr, 0.20 to 0.26 percent of Mo, 0.04 to 0.08 percent of V, and 0.02 to 0.06 percent of Ti; and the remaining content is Fe. The planet carrier steel casting material has the advantages that the working procedures are simplified, connection areas between a pin, an upper flange and a lower flange are subject to smooth transition by circular angles, so that the anti damage capacity and the working stability are enhanced; the traditional casting process of 'progressive solidification' by using the casting structure is changed, external chill is arranged at a specific area to change the earliest solidification area, the solidification feeding of the casting can be changed by changing a feeding channel chain, the connection areas between the pin, the upper flange and the lower flange are tightly, the stress of shrinkage solidification is greatly reduced, and cracks are avoided.

Description

Technical field [0001] The invention relates to a planetary carrier material for lifting gearboxes of jack-up offshore platforms with high speed ratio and super high torque, which adopts integral casting molding instead of split forging. After welding, the internal performance decreases and the low-temperature impact toughness is poor, and the column pins and the casting process The material and manufacturing method for crack defects in the upper and lower flange connection areas belong to the field of cast steel material manufacturing. Background technique [0002] In foreign countries, the upper and lower ends of the flange and the column pin are separately forged into blank parts in the design, and then welded after machining, and finally finished into shape. The specific manufacturing process is: scrap steel raw materials _ casting ingots _ forging forming _ part blanks _ rough machining _ welding _ finishing _ final product. Its shortcomings: The manufacturing process is co...

AI Technical Summary

Problems solved by technology

Its shortcomings: the manufacturing process is complicated, the processing cycle is long, the production cost is high, and the utilization rate of materials is low. Areas are prone to damage during use

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