Blocker-type forging method of travelling block lifting ring for petroleum drilling machine lifting system

Abstract

The invention discloses a blocker-type forging method of a travelling block lifting ring for a petroleum drilling machine lifting system. The method comprises the following steps that a blocker-type forging die is designed according to the shape and size of a forge piece; a blank is heated to the initial forging temperature, and free forging upsetting and rounding are conducted after heat preservation; and the blank is placed in the die to be forged, and after die stripping, cooling in heap and normalizing are conducted to obtain the lifting ring. According to the blocker-type forging method of the travelling block lifting ring for the petroleum drilling machine lifting system, the flowing direction of metal is limited by means of a blocker-type die in a forging process, the shape of a final forge piece is close to that of a part, the machining allowance of the forge piece is small, raw materials are saved, and after forging is completed, a lower die is subjected to automatic die stripping under the dead weight without overturning the blocker-type die and an ejection device, the operation is simple and convenient, the production efficiency is high, and the safety and reliability are achieved; and a metal streamline in the forged piece conforms to the shape of the part, the metal streamline is not cut off in subsequent machining, the mechanical property is excellent, and the userequirement of the travelling block lifting ring can be well met.

Description

technical field [0001] The invention belongs to the technical field of manufacturing methods of petroleum machinery and equipment, and in particular relates to a die forging method for a traveling block lifting ring tire used in a lifting system of a petroleum drilling rig. Background technique [0002] The lifting ring of the traveling block is a key part in the lifting system of the oil drilling rig. It bears the main weight during the lifting process of the drilling rig. It has high design requirements and strict mechanical performance requirements. It is generally a high-alloy steel forging. [0003] Taking YC-450 traveling car lifting ring as an example, its design requirements are: quenched and tempered 169-302HBW, mechanical properties: R m ≥785MPa, R eL ≥590MPa, A 4 ≥17%, Z≥45%, the average impact toughness value KV of three samples 8 ≥42J (-20°C), single value not less than 32J (-20°C). The quality of the forgings has passed the magnetic particle inspection, and...

AI Technical Summary

Problems solved by technology

The free forging process is to forge square block forgings first, and then wire cut the shape. The cut part generally accounts for about one-third of the total weight of the forging, and the material waste is serious; moreover, the wire cutting process will cut off the metal flow of the forging. wire, reduce its mechanical properties, affect the service life, and the cost of wire cutting is higher

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