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A method for manufacturing super-large ring forgings

A manufacturing method and super-large-scale technology, applied in the field of forging, can solve the problems of distortion and instability in the direction of wall thickness, long forging cycle, and inability to precisely control the process size, etc., to avoid distortion and instability, accurately control the size, and shorten the preparation cycle Effect

Active Publication Date: 2022-04-01
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The shape characteristics of thick-walled ring forgings: wall thickness > height. When this type of shape is traditionally reamed forging, pressure is applied in the direction of wall thickness, causing distortion and instability in the direction of wall thickness. Moreover, the reaming + leveling process is repeated continuously, the forging cycle is long, and the size is judged on the spot according to the on-site forming situation. The technology maturity is low, and the process size cannot be accurately controlled.

Method used

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  • A method for manufacturing super-large ring forgings
  • A method for manufacturing super-large ring forgings
  • A method for manufacturing super-large ring forgings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The size of oversized ring forgings is outer ring diameter D 外1 3000mm, inner ring diameter D内1 1000mm, height H 1 500mm;

[0075] Calculate the size of the green body according to formulas I, II and III;

[0076] (D 外0 ×D 外0 -D 内0 ×D 内0 )×H 0 =(D 外1 ×D 外1 -D 内1 ×D 内1 )×H 1 Formula I;

[0077] D. 外0 -D 内0 =2H 0 Formula II;

[0078] (H 0 -H 1 ) / H 0 = 28.6% Formula III;

[0079] Get the height H of the green body 0 700mm, the outer ring diameter of the green body D 外0 is 2740.8mm, the diameter of the inner ring is D 内0 1340.8mm;

[0080] Using formula IV, calculate the diameter D of the sub-circle of the green body 分 :

[0081] (D 外0 ×D 外0 -D 分 ×D 分 )×H 0 =(D 外1 ×D 外1 -D 分 ×D 分 )×H 1 Formula IV;

[0082] Get the circle diameter D of the green body 分 It is 1947.3mm.

[0083] In the actual forging execution, the size of the green body is rounded, that is, the actual size of the green body is: the diameter of the outer ring is 2745mm...

Embodiment 2

[0089] The size of oversized ring forgings is outer ring diameter D 外1 3500mm, inner ring diameter D内1 1200mm, height H 1 550mm;

[0090] Calculate the size of the green body according to formulas I, II and III;

[0091] (D 外0 ×D 外0 -D 内0 ×D 内0 )×H 0 =(D 外1 ×D 外1 -D 内1 ×D 内1 )×H 1 Formula I;

[0092] D. 外0 -D 内0 =2H 0 Formula II;

[0093] (H 0 -H 1 ) / H 0 = 28.6% Formula III;

[0094] Get the height H of the green body 0 is 770.3mm, the outer ring diameter of the green body D 外0 is 3275.3mm, the diameter of the inner ring is D 内0 1734.7mm;

[0095] Using formula IV, calculate the diameter D of the sub-circle of the green body 分 :

[0096] (D 外0 ×D 外0 -D 分 ×D 分 )×H 0 =(D 外1 ×D 外1 -D 分 ×D 分 )×H 1 Formula IV;

[0097] Get the circle diameter D of the green body 分 It is 2631.8mm.

[0098] In the actual forging execution, the size of the blank is rounded, that is, the actual size of the blank is: the diameter of the outer ring is 3280mm, the...

Embodiment 3

[0104] The size of oversized ring forgings is outer ring diameter D 外1 4000mm, inner ring diameter D内1 1900mm, height H 1 530mm;

[0105] Calculate the size of the green body according to formulas I, II and III;

[0106] (D 外0 ×D 外0 -D 内0 ×D 内0 )×H 0 =(D 外1 ×D 外1 -D 内1 ×D 内1 )×H 1 Formula I;

[0107] D. 外0 -D 内0 =2H 0 Formula II;

[0108] (H 0 -H 1 ) / H 0 = 28.6% Formula III;

[0109] Get the height H of the green body 0 is 742.3mm, the outer ring diameter of the green body D 外0 is 3721.7mm, and the diameter of the inner ring is D 内0 2237.1mm;

[0110] Using formula IV, calculate the diameter D of the sub-circle of the green body 分 :

[0111] (D 外0 ×D 外0 -D 分 ×D 分 )×H 0 =(D 外1 ×D 外1 -D 分 ×D 分 )×H 1 Formula IV;

[0112] Get the circle diameter D of the green body 分 It is 2913.1mm.

[0113] In the actual forging execution, the size of the blank is rounded, that is, the actual size of the blank is: the diameter of the outer ring is 3725mm,...

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Abstract

The invention provides a method for manufacturing a super-sized ring forging, which belongs to the technical field of metal thermal processing. In the present invention, a sub-circle is set between the inner ring and the outer ring of the blank, and the sub-circle is used as the boundary line, and the blank is forged twice, so that the forging obtained in the first stage of forging has a step difference that is low on the outside and high on the inside, forming The outer ring-shaped hoop effectively prevents the inner metal from flowing outward, avoids the distortion and instability of the blank in the wall thickness direction during the forging process, and does not need to be reamed after twisting, which shortens the preparation cycle; and can accurately Dimensions of control ring forgings. The manufacturing method provided by the invention can manufacture super-sized ring forgings with an outer diameter of more than 3000 mm.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a method for manufacturing a super-sized ring forging. Background technique [0002] The shape characteristics of thick-walled ring forgings: wall thickness > height. When this type of shape is traditionally reamed forging, pressure is applied in the direction of wall thickness, causing distortion and instability in the direction of wall thickness. Moreover, the reaming + leveling process is repeated continuously, the forging cycle is long, and the size is judged on-site according to the on-site forming situation. The technology maturity is low, and the process size cannot be accurately controlled. Contents of the invention [0003] In view of this, the object of the present invention is to provide a method for manufacturing a super-large ring forging. The ring forging obtained by the manufacturing method provided by the invention avoids the distortion and instability in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21K21/06
CPCB21J5/002B21K21/06
Inventor 陶志勇聂徐庆梁剑雄董凯任国柱王长军雷雪刘振宝王太江杨志勇张智峰
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD