CN109440033B

CN109440033B - Process method for eliminating residual stress of arc-shaped forge piece

Info

Publication number: CN109440033B
Application number: CN201811628398.8A
Authority: CN
Inventors: 刘强; 吴道祥; 陈焕良; 李丹丹; 曾庆华
Original assignee: Southwest Aluminum Group Co Ltd
Current assignee: Southwest Aluminum Group Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-06-09
Anticipated expiration: 2038-12-28
Also published as: CN109440033A

Abstract

The invention discloses a process method for eliminating residual stress of an arc-shaped forge piece, which comprises the following steps: 1) carrying out primary cold compression on the die forging; 2) and carrying out secondary cold compression on the die forging. By the process method, the residual stress of the arc-shaped forge piece can be effectively eliminated, the operation difficulty is low, and the cost is low.

Description

Process method for eliminating residual stress of arc-shaped forge piece

Technical Field

The invention relates to the technical field of aeronautical machinery, in particular to a process method for eliminating residual stress of an arc-shaped forge piece.

Background

The large-scale T-shaped section arc-shaped forge piece is used as a bearing structural part of an airplane, is easy to deform after quenching and has large residual stress, and generates severe machining deformation during machining, so that cold deformation is needed to achieve the purposes of correcting and eliminating the residual stress.

At present, the tensile method elimination residual stress of the general adoption profiling of foreign countries, but need large-scale tensile equipment, the input is great, under the condition that lacks large-scale tensile equipment, when adopting one set of mould to carry out cold compression to this type of forging, especially when compressing the fillet, the fillet is extremely sensitive to compression deformation, and requirement to compression precision is high, and is difficult to control, and takes place the card mo easily, if keep away the fillet position, then the stress of forging cross department can not obtain effective release, and is extremely unsatisfactory to residual stress's elimination effect.

Therefore, how to provide a process method for eliminating residual stress of an arc-shaped forge piece not only can effectively eliminate the residual stress, but also has small operation difficulty and low cost, and is a technical problem which needs to be solved by technical personnel in the field.

Disclosure of Invention

In view of this, the invention aims to provide a process method for eliminating residual stress of an arc-shaped forge piece, which can effectively eliminate the residual stress, and has small operation difficulty and low cost.

In order to achieve the above purpose, the invention provides the following technical scheme:

a process method for eliminating residual stress of an arc-shaped forge piece comprises the following steps:

1) carrying out primary cold compression on the die forging;

2) and carrying out secondary cold compression on the die forging.

Preferably, in the step 1), the die forging is subjected to cold compression by using a planar upper die and a planar lower die.

Preferably, in the step 1), the planar upper die and the planar lower die each include a plane for contacting the die forging.

Preferably, in the step 2), the die forging is subjected to cold compression by adopting an arc-shaped cold-pressing upper die and an arc-shaped cold-pressing lower die.

Preferably, in the step 2), the arc-shaped upper cold press die and the arc-shaped lower cold press die both comprise arc-shaped surfaces used for contacting with the die forging.

Preferably, the die forging is a die forging with a T-shaped section, or a die forging with an I-shaped section.

According to the technical scheme, the process method for eliminating the residual stress of the arc-shaped forge piece disclosed by the embodiment of the invention comprises the following steps: 1) carrying out primary cold compression on the die forging; 2) and carrying out secondary cold compression on the die forging. By the process method, the residual stress of the arc-shaped forge piece can be effectively eliminated, the operation difficulty is low, and the cost is low.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic flow chart of a process for eliminating residual stress of an arc-shaped forge piece disclosed by the embodiment of the invention;

FIG. 2 is a schematic view of a primary cold compression configuration disclosed in an embodiment of the present invention;

FIG. 3 is a schematic structural view of a secondary cold compression disclosed in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the position of the secondary cold compression disclosed by the embodiment of the invention.

Wherein, each part name is as follows:

1-die forging, 2-flat upper die, 3-flat lower die, 4-arc cold-pressing upper die and 5-arc cold-pressing lower die.

Detailed Description

In view of the above, the core of the invention is to provide a residual stress eliminating process method for an arc-shaped forging, which can effectively eliminate residual stress, and has small operation difficulty and low cost.

In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings and the detailed description.

The process method for eliminating the residual stress of the arc-shaped forge piece disclosed by the embodiment of the invention comprises the following steps: 1) carrying out primary cold compression on the die forging 1; 2) and carrying out secondary cold compression on the die forging 1. By the process method, the residual stress of the arc-shaped forge piece can be effectively eliminated, the operation difficulty is low, and the cost is low.

In step 1), the die forging 1 is subjected to primary cold compression by using a flat upper die 2 and a flat lower die 3. The upper flat die 2 and the lower flat die 3 are both made of metal materials, and the surfaces for contacting the die forging 1 are both the plane of the upper flat die 2 and the plane of the lower flat die 3.

It should further be noted that, after carrying out primary cold compression to the die forging 1, carry out secondary cold compression to the die forging 1 again, when carrying out secondary cold compression, need adopt arc to coldly press last mould 4 and arc to coldly press lower mould 4 and carry out cold compression, wherein, arc is coldly pressed last mould 4 and arc and is coldly pressed lower mould 4 and all adopts the metal material to make, arc is coldly pressed last mould 4 and arc and is coldly pressed lower mould 5 and all is included the arcwall face that is used for contacting with die forging 1, the arcwall face and the arc die forging 1 profile modeling setting of arc cold pressing last mould 4 and arc cold pressing lower mould 5, after the arcwall face through arc cold pressing last mould 4 and the arcwall face of arc cold pressing lower mould 5 and the upper and lower two sides of die forging 1 contact respectively, carry out secondary cold compression to die.

Certainly, the die forging 1 can be used for manufacturing a finished product meeting the quality requirement at a proper temperature, and in the process method for eliminating the residual stress of the arc forging provided by the embodiment of the invention, the temperature for realizing primary cold compression and the temperature for realizing secondary cold compression are both cold compression at normal temperature.

It should be noted that the specific shape of the die forging 1 is not limited, and in the process method for eliminating the residual stress of the arc-shaped forging disclosed in the embodiment of the present invention, the die forging 1 is preferably a T-shaped cross-section die forging or an i-shaped cross-section die forging, and particularly, the technical effect achieved by the large-sized T-shaped cross-section die forging using the process method disclosed in the embodiment of the present invention is better.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A process method for eliminating residual stress of an arc-shaped forge piece is characterized by comprising the following steps:

1) carrying out primary cold compression on the die forging (1);

2) carrying out secondary cold compression on the die forging (1);

in the step 1), cold compression is carried out on the die forging (1) by adopting a plane upper die (2) and a plane lower die (3); in the step 1), the plane upper die (2) and the plane lower die (3) both comprise planes used for being in contact with the die forging (1);

in the step 2), an arc-shaped cold pressing upper die (4) and an arc-shaped cold pressing lower die (5) are adopted to carry out cold compression on the die forging piece (1); in the step 2), the arc cold pressing upper die (4) and the arc cold pressing lower die (5) both comprise arc-shaped surfaces used for being in contact with the die forging (1).

2. The process for eliminating the residual stress of the arc-shaped forge piece according to the claim 1, characterized in that the die forge piece (1) is a T-shaped section die forge piece or an I-shaped section die forge piece.