Roll forming method of 4340 H steel E-shaped ring forging

A technology of ring forgings and ring rolling mills, which is applied in the field of rolling forming of 4340H steel E-ring forgings, which can solve the problems of partial neck, high material strength, folding, etc., and achieve the effect of excellent structure

Active Publication Date: 2013-10-16
GUIZHOU ANDA AVIATION FORGING
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Problems solved by technology

However, the intermediate billet of this method is a rectangular billet obtained after pre-rolling. For high-strength materials and complex-shaped ring forgings, such as 4340H steel "E" ring forgings, if the above-mentioned method is used to form, folding, partial neck, full Defects such as dissatisfaction

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  • Roll forming method of 4340 H steel E-shaped ring forging

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[0019] The main chemical element content (weight percentage) of 4340H steel is: C content 0.36% ~ 0.44%, Mn content 0.50% ~ 0.80%, Si content 0.17% ~ 0.37%, S content ≤ 0.020%, P content ≤0.020%, Cr content 0.60%~0.90%, Ni content 1.25%~1.75%, Mo content 0.15%~0.25%, balance Fe.

[0020] The forging process steps of the steel E-ring forging are as follows:

[0021] Such as figure 1 As shown, the 4340H steel bar 10 blanked according to the specification is heated to the forging temperature of 1100°C~1140°C, placed on the cutting board of the press, and a ring blank 20 is obtained after upsetting and punching; After the primary ring blank 20 is heated to a forging temperature of 1120°C~1160°C, the secondary ring blank 30 is obtained after the inner diameter is aggregated on a ring rolling mill with a core roll mold; and the secondary ring blank 30 is heated to 1140°C~ After a forging temperature of 1200°C, put it into a ring rolling mill equipped with a main roller die and rol...

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Abstract

The invention discloses a roll forming method of a 4340 H steel E-shaped ring forging, which is provided for guaranteeing a forming size of the E-shaped ring forging and preventing the defects of folding, offset, insufficient filling and the like. The method comprises processing steps as follows: a 4340 H steel bar material which is subjected to blanking according to specification is heated to a forging temperature ranging from 1,100 DEG C to 1,140 DEG C and is upset and punched to obtain a primary ring blank on a press machine; then, the primary ring blank is heated to a forging temperature ranging from 1,120 DEG C to 1,160 DEG C and is subjected to inner-bore material gathering to obtain a secondary ring blank on a ring rolling machine; and the secondary ring blank is placed in the ring rolling machine equipped with a main roller die for roll forming after the secondary ring blank is heated to a forging temperature ranging from 1,140 DEG C to 1,200 DEG C, the deformation is larger than or equal to 45%, and the E-shaped ring forging is obtained. The E-shaped ring forging is subjected to quenching and high-temperature tempering thermal treatment after forged, the quenching is that the E-shaped ring forging is heated to 860 DEG C and is subjected to oil cooling after thermal insulation, and the high-temperature tempering is that the E-shaped ring forging is heated to 590 DEG C and is subjected to air cooling after thermal insulation. The forging is mainly used for the field of wind power and mining machinery and the like.

Description

technical field [0001] The invention relates to a forging method of a ring, in particular to a rolling forming method of a 4340H steel E-shaped ring forging. Background technique [0002] 4340H steel is a structural steel with excellent performance. In the quenched and tempered state, it has good hardenability, good strength and toughness, and can manufacture large load-bearing structural parts. Therefore, 4340H is widely used in wind power High-strength key components in power generation, mining machinery and other fields. [0003] The Chinese invention patent specification CN 101279343A published on October 8, 2008 discloses a rolling forming method for stainless steel special-shaped ring forgings. The method includes blanking, upsetting, punching, and ring rolling. After the method is punched, pass Dies of different shapes are designed for direct ring rolling forming to realize the rolling forming of special-shaped ring forgings. However, the intermediate billet of this...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21H1/06B21J5/06
Inventor 魏志坚占立水欧阳斌杨晋朱灵华邹朝江李艳红
Owner GUIZHOU ANDA AVIATION FORGING
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