CN-122020853-A - Design method of extra-large hollow forging die in shape of Chinese character' Hui

CN122020853ACN 122020853 ACN122020853 ACN 122020853ACN-122020853-A

Abstract

The invention discloses a design method of an oversized hollow forging die in a shape like a Chinese character 'Hui', and belongs to the technical field of aviation manufacturing. Solves the problems that the manufacturing cost of the oversized square forging die in the prior art is high and the ultra-wide forging die manufacturing cannot be met. The method comprises the following steps of S1, selecting a cast steel matrix as a material of a forging die, S2, simulating and designing a reversed-character forging die of a hollow structure through a stress field according to the appearance characteristics of a forging piece and stress distribution born during production, S3, chamfering two ends of the bottom width of the forging die, which exceeds the allowable limit width of a forging press, and wherein the size of the bottom surface of the forging die after chamfering is smaller than or equal to the allowable maximum width of the forging press. The design method of the extra-large inverted-U-shaped hollow forging die is used for manufacturing the extra-large ultra-wide forging die to meet the requirement of large-frame forging production, inverted-U-shaped forging dies of hollow structures manufactured by cast steel, greatly reduces the manufacturing cost of the forging dies, and meets the requirement of manufacturing the extra-large inverted-U-shaped ultra-wide forging dies by chamfering two ends of the width of the bottom of the forging die.

Inventors

ZHAO XUANJIE
QIAN HAOCHENG
YU SHENGFENG
WEI MINGGANG
CUI MINGLIANG
MO ANJUN
MIN WU
ZENG JING
LI WENQIANG
GAO LEI

Assignees

重庆大学
中国第二重型机械集团德阳万航模锻有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (7)

1. The design method of the oversized hollow forging die in the shape of the Chinese character 'Hui', is characterized by comprising the following steps of: S1, selecting a cast steel matrix as a material of the forging die (1) according to the use temperature and working condition of the forging die (1); S2, according to the appearance characteristics of a large-scale inverted-V-shaped whole-frame forging and the stress distribution state born by the forging during production, an inverted-V-shaped forging die (1) of a hollow structure matched with the forging is simulated and designed through a full-flow stress field, and the inner ring of the forging die (1) is provided with grid-shaped reinforcing ribs (2); s3, chamfering is carried out on two end parts of the bottom width of the forging die (1) exceeding the allowable limit width of the die forging press, the chamfering angle is alpha, tan alpha = F/[ mu ] F, F in the formula is the pressure born by a unit area, mu is the friction coefficient of the die forging press and the forging die (1), F is the horizontal component of the pressure, the chamfering alpha value required by the ultra-wide forging die (1) can be calculated through the formula, and the bottom surface size of the forging die (1) after chamfering is smaller than or equal to the allowable maximum width of the die forging press.
2. The method for designing the oversized hollow forging die in the shape of the Chinese character 'hui' according to claim 1, wherein in the step S1, the microstructure of the forging die (1) is simulated and predicted through coupling simulation and optimization of a process and a structure, and the performance level of the cast steel matrix meets the use condition of the forging die (1).
3. The method for designing the oversized hollow forging die in the shape of the Chinese character 'hui', according to claim 1, wherein in the step S2, the minimum dimension from the die edge of the hollow area of the forging die (1) to the side surface of the forging cavity is L1, and L1 is more than or equal to 20mm and less than or equal to 50mm.
4. The design method of the oversized square-shaped hollow forging die according to claim 1, wherein in the step S3, the maximum width of the bottom surface of a die of an 800MN die forging press is 3140mm, the machined dimensions of the forging die (1) are 4600mm multiplied by 3400mm multiplied by 450mm, the two ends of the bottom width of the forging die (1) are chamfered upwards, and the width dimension of the bottom surface of the chamfered rear forging die (1) is less than or equal to 3140mm.
5. The design method of the oversized hollow forging die in the shape of the Chinese character 'hui', according to claim 1, is characterized in that the latticed reinforcing ribs (2) are formed by vertically staggering a plurality of longitudinal branch ribs (201) and a plurality of transverse branch ribs (202), the width H1 of the longitudinal branch ribs (201) is more than or equal to 100mm, and the width dimension D1 of the transverse branch ribs (202) is more than or equal to 100mm.
6. The design method of the oversized hollow forging die in the shape of the Chinese character 'Hui', according to claim 5, is characterized in that the length dimension H2 of the grid-shaped reinforcing ribs (2) is less than or equal to 600mm, and the width dimension D2 of the grid is less than or equal to 450mm.
7. The design method of the oversized hollow forging die in the shape of Chinese character 'Hui', according to claim 6, wherein angles between two adjacent sides of the grid-shaped reinforcing ribs (2) are rounded, and the radius R of the rounded angle is more than or equal to 50mm.

Description

Design method of extra-large hollow forging die in shape of Chinese character' Hui Technical Field The invention belongs to the technical field of aviation manufacturing, and particularly relates to a design method of an extra-large hollow forging die shaped like a Chinese character 'Hui'. Background With the development of the technical field of aviation manufacturing, aviation die forgings are developed in the direction of integration, light weight and precision, and the integration requirements of various types of aircraft die forgings are increasing. The large aluminum frame forging is produced by adopting 3 sets of dies, the weight of a single set of forging dies is 110.5 tons, the width of the forging dies is 3400mm, the large aluminum frame forging belongs to the extra large forging dies, the maximum size die allowed by the existing maximum 800MN forging press is smaller than or equal to 3140mm, the extra large forging dies of the single set of forging dies exceeding 100 tons are all integrally processed by adopting die steel and are all solid-structured dies, the material consumption of the process path is extremely large, the larger the material unit price of the die is higher, the processing cost is higher, the transportation cost is higher, and the like, so that the production and manufacturing cost is high, the design of the forging dies with the width exceeding 3140mm is not realized, the die width exceeding the platform size of the 800MN forging press is realized, part of the dies is suspended, a complex stress field can be formed in a suspended transition area in the actual use process, and the forging dies can be damaged due to improper stress control. Disclosure of Invention The invention provides a design method of an oversized Chinese character 'Hui' shaped hollow forging die, which greatly reduces the manufacturing cost and meets the manufacturing requirement of the oversized Chinese character 'Hui' shaped ultra-wide forging die. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention discloses a design method of an oversized Chinese character 'Hui' shaped hollow forging die, which comprises the following steps: S1, selecting a cast steel matrix as a material of a forging die according to the use temperature and working condition of the forging die; S2, according to the appearance characteristics of the large-scale inverted-V-shaped whole-frame forging and the stress distribution state born by the forging during production, an inverted-V-shaped forging die of a hollow structure matched with the forging is simulated and designed through a full-flow stress field, and the inner ring of the forging die is provided with grid-shaped reinforcing ribs; S3, chamfering is carried out on two end parts of the bottom width of the forging die, the bottom width of which exceeds the allowable limit width of the die forging press, the chamfering angle is alpha, tan alpha=F/μf, F in the formula is the pressure born by a unit area, μ is the friction coefficient of the die forging press and the forging die, F is the horizontal component of the pressure, the required chamfering alpha value of the ultra-wide forging die can be calculated through the formula, and the size of the bottom surface of the forging die after chamfering is smaller than or equal to the allowable maximum width of the die forging press. Further, in step S1, the microstructure of the forging die is simulated and predicted through process and tissue coupling simulation and optimization, and the performance level of the cast steel matrix meets the use condition of the forging die. In step S2, the minimum dimension from the die edge of the hollow area of the forging die to the side surface of the cavity of the forging die is L1, and L1 is more than or equal to 20mm and less than or equal to 50mm. Further, in the step S3, the maximum width of the bottom surface of the die of the 800MN die forging press is 3140mm, the processed dimension of the forging die is 4600mm multiplied by 3400mm multiplied by 450mm, the two ends of the width of the bottom of the forging die face upwards to be chamfered, and the width dimension of the bottom surface of the forging die after chamfering is less than or equal to 3140mm. Further, the latticed reinforcing ribs are formed by vertically staggering a plurality of longitudinal branch ribs and a plurality of transverse branch ribs, the width H1 of the longitudinal branch ribs is more than or equal to 100mm, and the width dimension D1 of the transverse branch ribs is more than or equal to 100mm. Further, the length dimension H2 of the grid-shaped reinforcing ribs is less than or equal to 600mm, and the width dimension D2 is less than or equal to 450mm. Further, the included angles of two adjacent sides of the grid-shaped reinforcing ribs are rounded, and the radius R of the rounded corners is more than or equal to 50mm. The beneficial effects of the invention are a