CN103521670B - A kind of method improving titanium alloy pulling forging structural homogenity - Google Patents
A kind of method improving titanium alloy pulling forging structural homogenity Download PDFInfo
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Abstract
The invention discloses a kind of method improving titanium alloy pulling forging structural homogenity, the method is: one, the titanium alloy with square cross section obtained is forged in conventional jumping-up pulling and be placed on operating platform, make the length direction of the titanium alloy with square cross section axially parallel with upper flat anvil, the titanium alloy with square cross section is carried out entirety and flattens by the diagonal along described square cross section, obtains the titanium alloy with hexagonal cross-section; Two, carry out entirety after the titanium alloy with hexagonal cross-section being overturn 90 ° to flatten, obtain the titanium alloy with octagonal cross-section; Three, two are repeated to the titanium alloy with octagonal cross-section, until obtaining cross section is square, the titanium alloy forging that size is measure-alike with the titanium alloy with square cross section.The present invention, by implementing large plastic deformation to the different directions of material cross-section, improves single direction pulling and is out of shape the cross inhomogeneous deformation situation caused, thus reach the uniform object of each site tissue of forging.
Description
Technical field
The invention belongs to materials processing technology field, be specifically related to a kind of method improving titanium alloy pulling forging structural homogenity.
Background technology
By the restriction of titanium alloy physical property and melting technique, forging is still in titanic alloy machining and uses the most extensively and effective method, and the method not only directly can forge into required workpiece shapes, can also optimize heterogeneous microstructure, eliminate the defects such as cast condition is loose, improve the mechanical property of material.
For forging, be out of shape more even, local deformation difference is less, organizes more even, and therefore the deformation uniformity of forging is the important indicator weighing forging quality.Forging deformation uniformity is better, and the distortion of its each several part is more tending towards even, is conducive to producing uniform interior tissue, improves the performance of forging.Pulling technique is the most basic operation of titanium alloy open die forging, and single direction pulling forging deformation easily causes cross inhomogeneous deformation, and as-cast structure is broken insufficient and have heredity, causes uneven microstructure sex chromosome mosaicism in finished product forging to be difficult to solve.
In recent years, the hammered work person of various countries has carried out a large amount of exploratory development to improve the uniformity of forging tissue, on the basis of flat-anvils stretching research, successively propose a series of new pulling method, such as FM forging method, WHF forging method, KD forging method, SUF forging method, TER forging method, JTS forging method, FML forging method and AVD forging method, these are all realized by change pulling anvil shape and process conditions.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of method improving titanium alloy pulling forging structural homogenity.The method is be arranged in parallel by length direction and the upper flat anvil axis of the titanium alloy by having square cross section, diagonal along square cross section is carried out entirety and is flattened into hexagonal cross-section, then overturn 90 ° and carry out entirety flattening along another diagonal in square cross section again, so repeatedly flatten until again become square cross section, large plastic deformation is implemented to the different directions of material cross-section, improve single direction pulling and be out of shape the cross inhomogeneous deformation situation caused, thus reach the uniform object of each site tissue of forging.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method improving titanium alloy pulling forging structural homogenity, and it is characterized in that, the method comprises the following steps:
Step one, the titanium alloy with square cross section obtained is forged in the pulling of conventional jumping-up be placed on operating platform, make the length direction of the titanium alloy with square cross section axially parallel with upper flat anvil, the titanium alloy with square cross section is carried out entirety and flattens by the diagonal along described square cross section, obtains the titanium alloy with hexagonal cross-section;
Step 2, the titanium alloy described in step one with hexagonal cross-section is overturn 90 ° after carry out entirety flatten, obtain the titanium alloy with octagonal cross-section;
Step 3, step 2 is repeated to the titanium alloy described in step 2 with octagonal cross-section, until obtaining cross section is square, there is described in size and step one titanium alloy forging that the titanium alloy in square cross section is measure-alike.
A kind of above-mentioned method improving titanium alloy pulling forging structural homogenity, the length described in step one with the titanium alloy in square cross section is less than the length of flat anvil.
A kind of above-mentioned method improving titanium alloy pulling forging structural homogenity, described in step one, the overall drafts flattened is 30% ~ 50%.
A kind of above-mentioned method improving titanium alloy pulling forging structural homogenity, described in step 2, the overall drafts flattened is 30% ~ 50%.
The present invention compared with prior art has the following advantages:
1, the present invention is be arranged in parallel by length direction and the upper flat anvil axis of the titanium alloy by having square cross section, diagonal along square cross section is carried out entirety and is flattened into hexagonal cross-section, then overturn 90 ° and carry out entirety flattening along another diagonal in square cross section again, so repeatedly flatten, until again become square cross section, large plastic deformation is implemented to the different directions of material cross-section, improve single direction pulling and be out of shape the cross inhomogeneous deformation situation caused, thus reach the uniform object of each site tissue of forging.
2, method of the present invention being jumping-up between each fire of cogging and centre for improving beta-titanium alloy time, pull out the forging mode of as-forged microstructure uniformity afterwards.
3, the inventive method processing technology is simple, easy to operate, does not need special installation.
4, the titanium alloy forging structural homogenity adopting method of the present invention to forge is good, simultaneously because process control difficulties is low, improves process stabilizing degree.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the present invention has the titanium alloy in square cross section and the position relationship schematic diagram of upper flat anvil and operating platform.
Fig. 2 is the process flow diagram of titanium alloy of the present invention pulling forging.
Fig. 3 is the macrostructure figure after the forging heat treatment of embodiment 1 conventional titanium alloy jumping-up pulling forging.
Fig. 4 is the macrostructure figure after the forging heat treatment of the embodiment of the present invention 2 forging.
Fig. 5 is the mirco structure figure after the forging heat treatment of embodiment 1 conventional titanium alloy jumping-up pulling forging.
Fig. 6 is the mirco structure figure after the forging heat treatment of the embodiment of the present invention 2 forging.
Description of reference numerals:
1-there is the titanium alloy in square cross section; 2-operating platform; 3-upper flat anvil.
Detailed description of the invention
Equipment: 2500T forging press, upper flat anvil size: 500mm(B) × 1200mm(L);
Raw material: Φ 310mm × 600mmTC18 titan alloy casting ingot, the production decision contrast before and after now applying the present invention is as follows:
Conventional pulling forging method:
Embodiment 1
Step one, Upsetting: carry out Upsetting along on ingot casting axial direction, deflection about 30%, after Upsetting, scantling is Φ 380mm × 400mm, and cydariform appears in side;
Step 2, pulling distortion: by the 90 ° of overturnings of the ingot casting after Upsetting in step one, in axial direction compress about 20%, overturn 90 °, continue compression about 20%, overturn 90 ° again, compression about 20%, commutation pulling is to the titanium alloy with square cross section being of a size of 250mm × 250mm × 670mm so repeatedly.
The titanium alloy H/D(ratio of height to diameter in prepared by the present embodiment have square cross section)≤3, now can proceed Upsetting according to actual needs, also can proceed pulling distortion until finished product forging.
Forging method of the present invention is described according to embodiment 2 to embodiment 4, process chart as shown in Figure 2:
Embodiment 2
Step one, as shown in Figure 1, the titanium alloy 1 with square cross section obtained in embodiment 1 is placed on operating platform 2, make the length direction of the titanium alloy 1 with square cross section axially parallel with upper flat anvil 3, the titanium alloy 1 with square cross section is carried out entirety and flattens by the diagonal along described square cross section, obtains the titanium alloy with hexagonal cross-section; The drafts that described entirety is flattened is 30%;
Step 2, the titanium alloy described in step one with hexagonal cross-section is overturn 90 ° after carry out entirety flatten, obtain the titanium alloy with octagonal cross-section; The drafts that described entirety is flattened is 30%;
Step 3, to have described in step 2 octagonal cross-section titanium alloy repeat step 2, until obtaining cross section is square, be of a size of the titanium alloy forging of 250mm × 250mm × 670mm.
Titanium alloy forging H/D(ratio of height to diameter prepared by the present embodiment)≤3, now can proceed Upsetting according to actual needs, also can proceed pulling distortion until finished product forging.
Embodiment 3
Step one, as shown in Figure 1, the titanium alloy 1 with square cross section obtained in embodiment 1 is placed on operating platform 2, make the length direction of the titanium alloy 1 with square cross section axially parallel with upper flat anvil 3, the titanium alloy 1 with square cross section is carried out entirety and flattens by the diagonal along described square cross section, obtains the titanium alloy with hexagonal cross-section; The drafts that described entirety is flattened is 40%;
Step 2, the titanium alloy described in step one with hexagonal cross-section is overturn 90 ° after carry out entirety flatten, obtain the titanium alloy with octagonal cross-section; The drafts that described entirety is flattened is 40%;
Step 3, to have described in step 2 octagonal cross-section titanium alloy repeat step 2, until obtaining cross section is square, be of a size of the titanium alloy forging of 250mm × 250mm × 670mm.
Titanium alloy forging H/D(ratio of height to diameter prepared by the present embodiment)≤3, now can proceed Upsetting according to actual needs, also can proceed pulling distortion until finished product forging.
Embodiment 4
Step one, as shown in Figure 1, the titanium alloy 1 with square cross section obtained in embodiment 1 is placed on operating platform 2, make the length direction of the titanium alloy 1 with square cross section axially parallel with upper flat anvil 3, the titanium alloy 1 with square cross section is carried out entirety and flattens by the diagonal along described square cross section, obtains the titanium alloy with hexagonal cross-section; The drafts that described entirety is flattened is 50%;
Step 2, the titanium alloy described in step one with hexagonal cross-section is overturn 90 ° after carry out entirety flatten, obtain the titanium alloy with octagonal cross-section; The drafts that described entirety is flattened is 50%;
Step 3, to have described in step 2 octagonal cross-section titanium alloy repeat step 2, until obtaining cross section is square, be of a size of the titanium alloy forging of 250mm × 250mm × 670mm.
Titanium alloy forging H/D(ratio of height to diameter prepared by the present embodiment)≤3, now can proceed Upsetting according to actual needs, also can proceed pulling distortion until finished product forging.
Respectively normative heat treatment is carried out to the forging forging forging in the forging and embodiment 2 obtained conventional in embodiment 1, then macrostructure observation and mirco structure observation are carried out to the forging after heat treatment, the results are shown in Figure 3 to Fig. 6, can obviously find out from figure, adopt the titanium alloy of forging mode of the present invention to routine pulling forging to carry out entirety to flatten, large plastic deformation is implemented to the different directions of material cross-section, improve single direction pulling and be out of shape the cross inhomogeneous deformation situation caused, the titanium alloy forging structural homogenity of forging is all good, simultaneously because process control difficulties is low, improve process stabilizing degree.
The above; it is only preferred embodiment of the present invention; not any restriction is done to the present invention, every above embodiment is done according to invention technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (1)
1. improve a method for titanium alloy pulling forging structural homogenity, it is characterized in that, the method comprises the following steps:
Step one, the titanium alloy (1) with square cross section obtained is forged in the pulling of conventional jumping-up be placed on operating platform (2), make the length direction of the titanium alloy (1) with square cross section axially parallel with upper flat anvil (3), the titanium alloy (1) with square cross section is carried out entirety and flattens by the diagonal along described square cross section, obtains the titanium alloy with hexagonal cross-section; The described length with the titanium alloy (1) in square cross section is less than the length of flat anvil (3); The drafts that described entirety is flattened is 30% ~ 50%;
Step 2, the titanium alloy described in step one with hexagonal cross-section is overturn 90 ° after carry out entirety flatten, obtain the titanium alloy with octagonal cross-section; The drafts that described entirety is flattened is 30% ~ 50%;
Step 3, step 2 is repeated to the titanium alloy described in step 2 with octagonal cross-section, until obtaining cross section is square, there is described in size and step one titanium alloy forging that the titanium alloy (1) in square cross section is measure-alike.
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| CN104073751B (en) * | 2014-03-11 | 2016-08-17 | 宁夏东方钽业股份有限公司 | A kind of method improving titanium alloy large size bar structural homogenity |
| CN103938137B (en) * | 2014-04-08 | 2016-01-06 | 中国航空工业集团公司北京航空材料研究院 | A kind of method changing titanium alloy large size bar homogeneity of structure |
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| CN108057829B (en) * | 2017-12-14 | 2019-08-09 | 西安赛特思迈钛业有限公司 | A kind of forging method improving titanium alloy forging stock structural homogenity |
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| CN111940654A (en) * | 2020-08-12 | 2020-11-17 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank |
| CN112275828B (en) * | 2020-10-09 | 2022-04-19 | 中国航发北京航空材料研究院 | Upsetting-drawing deformation method for TB6 titanium alloy large-size bar |
| CN112536406B (en) * | 2020-11-25 | 2023-07-25 | 浙江天马轴承集团有限公司 | Forging drawing method for avoiding surface cracking |
| CN112893725A (en) * | 2020-12-29 | 2021-06-04 | 常州中钢精密锻材有限公司 | Method for improving surface quality of titanium alloy forging |
| CN112658190B (en) * | 2021-02-24 | 2023-04-07 | 河南科技大学 | Steel ingot CWFF forging method and convex wide anvil |
| CN113145778B (en) * | 2021-04-27 | 2022-10-04 | 西北有色金属研究院 | Cogging forging method for improving structural uniformity of beta titanium alloy |
| CN115156451A (en) * | 2022-06-17 | 2022-10-11 | 中国航发北京航空材料研究院 | Method for uniform deformation of structure of large-size titanium alloy bar |
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Effective date of registration: 20220805 Address after: A-115-17, iChuangtu Zhongchuang Park, No. 14, Gaoxin 2nd Road, High-tech Zone, Xi'an City, Shaanxi Province 710075 Patentee after: Xi'an Qintai Intelligent Manufacturing Technology Co., Ltd. Address before: Weiyang road 710016 Shaanxi city of Xi'an province No. 96 Patentee before: NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH |