CN105522090A - Upsetting method of alpha-beta-phase titanium alloy cake blank - Google Patents

Upsetting method of alpha-beta-phase titanium alloy cake blank Download PDF

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Publication number
CN105522090A
CN105522090A CN201510866927.8A CN201510866927A CN105522090A CN 105522090 A CN105522090 A CN 105522090A CN 201510866927 A CN201510866927 A CN 201510866927A CN 105522090 A CN105522090 A CN 105522090A
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CN
China
Prior art keywords
biscuit
alpha
special tooling
titanium alloy
phase titanium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510866927.8A
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Chinese (zh)
Inventor
郑永灵
斯庆阳
卢艳
罗通
吴超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guizhou Anda Aviation Forging Co Ltd
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Guizhou Anda Aviation Forging Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Guizhou Anda Aviation Forging Co Ltd filed Critical Guizhou Anda Aviation Forging Co Ltd
Priority to CN201510866927.8A priority Critical patent/CN105522090A/en
Publication of CN105522090A publication Critical patent/CN105522090A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08Upsetting

Abstract

The invention discloses an upsetting method of an alpha-beta-phase titanium alloy cake blank. The upsetting method comprises the following steps: at first, an alpha-beta-phase titanium alloy bar is upset in a conventional method, so as to enable the deformation of the alpha-beta-phase titanium alloy bar to be up to 25% to 35%; and the end surface of a middle cake blank is locally deformed by a dedicated tool. The upsetting method has the advantages that defects such as deformation dead zones generated in a conventional upsetting method can be eliminated effectively, and the structure homogeneity of the alpha-beta-phase titanium alloy cake blank can be improved effectively, so that the performance of a forging is improved. The upsetting method is used for upsetting the alpha-beta-phase titanium alloy cake blank.

Description

The method for upsetting of alpha-beta phase titanium alloy biscuit
Technical field
The present invention relates to a kind of method for upsetting of biscuit, particularly relate to the method for upsetting of alpha-beta phase titanium alloy biscuit.
Background technology
Jumping-up adopts forging press to be reduced and the Forging Technology of cross section increase by the height of metal material, and being the operation important and the most basic together of forging industry, can be subsequent handling, as open die forging, die forging, looping mill rolling etc. provide blank.Usually, in the upsetting process of biscuit, because the chopping block up and down of forging press exists very large friction with the upper and lower end face of excellent base respectively, biscuit upper and lower end face is finally caused all to there is certain distortion dead band (as shown in Figure 1).Relative to other regions of biscuit, the distortion of this district is less even without distortion, result in biscuit unhomogeneity of deformation.This unhomogeneity of deformation directly has influence on the inhomogeneities of the structure property of biscuit, even produces negative influence to follow-up forging process, finally has influence on the structure property of product.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method for upsetting adopting end face local deformation, realizes the jumping-up of alpha-beta phase titanium alloy biscuit, to improve the structural homogenity of alpha-beta phase titanium alloy biscuit, thus improves the performance of forging.
For solving the problems of the technologies described above, the method for upsetting of alpha-beta phase titanium alloy biscuit of the present invention, its technical scheme comprises the following steps:
Diameter be D, highly for the alpha-beta phase titanium alloy rod bar of H is heated to forging temperature in forge furnace, after insulation a period of time; Bar is placed under forging press on chopping block, drive forging hammer downwards by bar jumping-up to being highly H 0=(0.65 ~ 0.75) H, its deflection is 25% ~ 35%, biscuit in the middle of obtaining;
Be disposed across on middle biscuit by special tooling through the center of middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms first impression on middle biscuit, and the degree of depth of impression is h, completes first time local deformation; By special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms second impression on middle biscuit, and the degree of depth of impression is h, completes second time local deformation; Again by special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms the 3rd road impression on middle biscuit, and the degree of depth of impression is h, completes for the third time local deformation; Special tooling is taken out, drives forging hammer to press to middle biscuit, under the effect of forging hammer and lower chopping block, the impression of middle biscuit is disappeared completely, completes the gathering stock of upper surface;
Middle biscuit is turned, according to the operation of above-mentioned upper surface gathering stock, the other end of middle biscuit completes the gathering stock of lower surface, obtain alpha-beta phase titanium alloy biscuit.
Described special tooling to the depth of cup of middle biscuit is:
Wherein, H is the height of bar;
H 0for the height of middle biscuit;
σ, for being out of shape the ratio of volume shared by dead band during conventional deformation, gets 0.15 ~ 0.3.
Described special tooling is bar, its width d=(0.2 ~ 0.3) D 0; D 0for the diameter of middle biscuit.
Described alpha-beta phase titanium alloy is TC4 alloy.
Compared with prior art, beneficial effect of the present invention is as follows:
The method for upsetting of alpha-beta phase titanium alloy biscuit of the present invention, by employing, prepared by alpha-beta phase titanium alloy biscuit to the method for upsetting that the end face of biscuit carries out local deformation, the advantage of the method is, the distortion of gained alpha-beta phase titanium alloy biscuit evenly, there is not distortion dead band, greatly enhance the forging performance of follow-up forging and molding.
This method first by conventional for alpha-beta phase titanium alloy biscuit jumping-up to H 0=(0.65 ~ 0.75) H is to ensure that the deflection of alpha-beta phase titanium alloy biscuit zone line can reach 25% ~ 35%; Special tooling to the depth of cup of middle biscuit is that its deflection can be consistent with zone line in order to ensure that alpha-beta phase titanium alloy biscuit distortion dead band is by end face local deformation.
Width d=(0.2 ~ 0.3) D of special tooling described in this method 0, defects such as can not folding when carrying out smooth to the impression of middle biscuit can be ensured.
Adopt alpha-beta phase titanium alloy biscuit prepared by said method, obtaining the forging of even tissue, better performances after forging and molding, is that the alpha-beta phase titanium alloy forging of TC4 is example with the trade mark:
This alloy forged piece even tissue, crystal grain are tiny after testing, meet technical conditions requirement.
This alloy forged piece is without groove, the blemish such as folding after testing.
The room temperature tensile properties of this alloy forged piece after testing, its tensile strength is 980MPa ~ 1000MPa (being greater than the 895MPa of design instructions for use), yield strength when percentage elongation is 0.2% is 945MPa ~ 960MPa (being greater than the 825MPa of design instructions for use), elongation after fracture was 11.5% ~ 13.5% (being greater than 10% of design instructions for use), and the contraction percentage of area was 43.5% ~ 47.5% (being greater than 20% of design instructions for use).
The testing result of the drawing by high temperature duration running of this alloy forged piece also all meets technical conditions requirement after testing.
Above-mentioned Physico-chemical tests result shows, the TC4 alloy forged piece property indices adopting the alpha-beta phase titanium alloy biscuit after improving to be shaped all meets the requirements.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the biscuit schematic diagram of prior art jumping-up.
Fig. 2 is middle biscuit structural representation.
Fig. 3 is middle biscuit end face local deformation schematic diagram.
Fig. 4 is the rotation schematic diagram of special tooling.
Detailed description of the invention
Implement alpha-beta phase titanium alloy biscuit method for upsetting of the present invention to need to provide the equipment such as forge furnace, forcing press, manipulator, special tooling.The alpha-beta phase titanium alloy being TC4 for China's material trademark below describes the detailed description of the invention of the method in detail:
The main chemical elements content (percentage by weight) of this alloy is: containing Al amount 5.5% ~ 6.8%, V content 3.5% ~ 4.5%, containing Fe amount≤0.30%, C content≤0.10%, leaded wastewater≤0.05%, containing H amount≤0.015%, containing O amount≤0.20%, other elements are single≤0.10% and summation≤0.40%, surplus are Ti.
The step of this method is as follows:
Step 1: conventional jumping-up.
Diameter be D, highly for the alpha-beta phase titanium alloy rod bar of H is heated to forging temperature in forge furnace, after insulation a period of time; Bar is placed under forging press on chopping block, in order to the deflection of alpha-beta phase titanium alloy biscuit zone line can reach 25% ~ 35% after ensureing jumping-up, by bar jumping-up to being highly H 0=(0.65 ~ 0.75) H, biscuit 1 in the middle of obtaining, as shown in Figure 2.
Step 2: upper surface gathering stock.
As shown in the figure, special tooling 2 is disposed across on middle biscuit 1 through the center of middle biscuit 1, for ensureing defects such as can not folding when carrying out smooth to the impression of middle biscuit 1, width d=(0.2 ~ 0.3) D of special tooling 2 used 0, drive forging hammer with the pressure of F size, to pressing down special tooling 2, special tooling 2 forms first impression on middle biscuit 1, and the degree of depth of impression is h, completes first time local deformation; As shown in Figure 3, by special tooling 2 after the center of middle biscuit 1 is rotated counterclockwise 60 °, be disposed across on middle biscuit 1, drive forging hammer to pressing down special tooling 2, special tooling 2 forms second impression on middle biscuit 1, and the degree of depth of impression is h, completes second time local deformation; Again by special tooling 2 after the center of middle biscuit 1 is rotated counterclockwise 60 °, be disposed across on middle biscuit 1, drive forging hammer to pressing down special tooling 2, special tooling 2 forms the 3rd road impression on middle biscuit 1, the degree of depth of impression is h, completes third time local deformation; Special tooling 2 is taken out, drives forging hammer to press to middle biscuit 1, under the effect of forging hammer and lower chopping block, the impression of middle biscuit 1 is disappeared completely, completes upper surface gathering stock.
In order to make alpha-beta phase titanium alloy biscuit be out of shape dead band by end face local deformation, its deflection can be consistent with zone line, reaches 25% ~ 35%, and described special tooling to the depth of cup of middle biscuit is: h = σ · HH 0 - H 0 2 2 H
Wherein, H is the height of bar;
H 0for the height of middle biscuit;
σ, for being out of shape the ratio of volume shared by dead band during conventional deformation, gets 0.15 ~ 0.3.
Step 3: lower surface gathering stock.
Middle biscuit is turned, according to the operation of above-mentioned upper surface gathering stock, the other end of middle biscuit completes the gathering stock of lower surface, obtain alpha-beta phase titanium alloy biscuit.

Claims (4)

1. a method for upsetting for alpha-beta phase titanium alloy biscuit, is characterized in that, comprise the following steps:
Diameter be D, highly for the alpha-beta phase titanium alloy rod bar of H is heated to forging temperature in forge furnace, after insulation a period of time; Bar is placed under forging press on chopping block, drive forging hammer downwards by bar jumping-up to being highly H 0=(0.65 ~ 0.75) H, its deflection is 25% ~ 35%, biscuit in the middle of obtaining;
Be disposed across on middle biscuit by special tooling through the center of middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms first impression on middle biscuit, and the degree of depth of impression is h, completes first time local deformation; By special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms second impression on middle biscuit, and the degree of depth of impression is h, completes second time local deformation; Again by special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms the 3rd road impression on middle biscuit, and the degree of depth of impression is h, completes for the third time local deformation; Special tooling is taken out, drives forging hammer to press to middle biscuit, under the effect of forging hammer and lower chopping block, the impression of middle biscuit is disappeared completely, completes the gathering stock of upper surface;
Middle biscuit is turned, according to the operation of above-mentioned upper surface gathering stock, the other end of middle biscuit completes the gathering stock of lower surface, obtain alpha-beta phase titanium alloy biscuit.
2. the method for upsetting of alpha-beta phase titanium alloy biscuit according to claim 1, is characterized in that, described alpha-beta phase titanium alloy is TC4 alloy.
3. the method for upsetting of alpha-beta phase titanium alloy biscuit according to claim 1 and 2, it is characterized in that, described special tooling to the depth of cup of middle biscuit is:
Wherein, H is the height of bar;
H 0for the height of middle biscuit;
σ, for being out of shape the ratio of volume shared by dead band during conventional deformation, gets 0.15 ~ 0.3.
4. the method for upsetting of alpha-beta phase titanium alloy biscuit according to claim 1 and 2, it is characterized in that, described special tooling is bar, its width d=(0.2 ~ 0.3) D 0, wherein, D 0for the diameter of middle biscuit.
CN201510866927.8A 2015-12-02 2015-12-02 Upsetting method of alpha-beta-phase titanium alloy cake blank Pending CN105522090A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107414001A (en) * 2016-12-01 2017-12-01 贵州安大航空锻造有限责任公司 Especially big Type Titanium Alloy propeller hub forging substep forging forming method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62286640A (en) * 1986-06-03 1987-12-12 Nippon Steel Corp Forging method for titanium alloy
CN103447431A (en) * 2012-06-01 2013-12-18 鑫科材料科技股份有限公司 Method of improving flat die forging forming uniformity
JP2014168795A (en) * 2013-03-01 2014-09-18 Hitachi Metals Ltd Mold for rotary forging

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62286640A (en) * 1986-06-03 1987-12-12 Nippon Steel Corp Forging method for titanium alloy
CN103447431A (en) * 2012-06-01 2013-12-18 鑫科材料科技股份有限公司 Method of improving flat die forging forming uniformity
JP2014168795A (en) * 2013-03-01 2014-09-18 Hitachi Metals Ltd Mold for rotary forging

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
任猛等: "大型圆饼类件锻造及RST效应", 《大型铸锻件》 *
韩静涛等: "控制大型饼类锻件夹杂性缺陷的镦粗成形工艺研究", 《大型铸锻件》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107414001A (en) * 2016-12-01 2017-12-01 贵州安大航空锻造有限责任公司 Especially big Type Titanium Alloy propeller hub forging substep forging forming method

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Application publication date: 20160427