CN115156451A - Method for uniform deformation of structure of large-size titanium alloy bar - Google Patents
Method for uniform deformation of structure of large-size titanium alloy bar Download PDFInfo
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- CN115156451A CN115156451A CN202210695219.2A CN202210695219A CN115156451A CN 115156451 A CN115156451 A CN 115156451A CN 202210695219 A CN202210695219 A CN 202210695219A CN 115156451 A CN115156451 A CN 115156451A
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- bar
- blank
- upsetting
- titanium alloy
- deformation
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 23
- 238000005242 forging Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 19
- 238000013021 overheating Methods 0.000 abstract description 3
- 230000035515 penetration Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010621 bar drawing Methods 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/12—Forming profiles on internal or external surfaces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a method for homogenizing and deforming the structure of a large-size titanium alloy bar, which comprises the following steps: heating the bar blank to a forging temperature, wherein the height-diameter ratio of the bar blank is less than 2.7, upsetting and drawing out on a quick forging machine, wherein the upsetting mode of multi-pass local upsetting is adopted during upsetting, the upsetting total deformation is 50% -55%, drawing out four directions firstly during drawing, the deformation per hammer is 50-120 mm during drawing out, then interchanging and drawing out the prism surfaces of the four directions into eight directions, the deformation per hammer is 30-100 mm during drawing out, chamfering to a sixteen-sided body, and then carrying out hexagonal drawing out, and the deformation per hammer is 30-100 mm during drawing out. The variable cross-section upsetting and drawing method for the large-size titanium alloy bar with the diameter larger than 400mm can enable all parts of the large-size bar to be uniformly deformed, eliminate deformation dead zones and overheating at the center and increase the forging penetration of the large-size bar.
Description
Technical Field
The invention belongs to the technical field of titanium alloy material forging processes, and particularly relates to a structure homogenization deformation method of a large-size titanium alloy bar.
Background
The titanium and the titanium alloy have small linear expansion coefficient, large deformation resistance and poor metal fluidity, and the phenomenon of uneven structure and performance caused by uneven deformation is often caused when a large-size titanium alloy bar is forged. When a two-phase region of a large-size titanium alloy bar is forged, the microstructure difference of the bar from the center to the edge is large, the alpha phase of the edge and the center is mainly equiaxial, the edge is fine equiaxial, more elongated alpha phases exist at the 1/2R position, but the tissues at the center and the 1/2R position are not broken sufficiently, and the original beta grain boundary still exists.
When the titanium alloy bar is forged, repeated upsetting and drawing are needed to ensure the consistency of the structure and the performance, a deformation dead zone exists in the conventional drawing of the square bar, the non-uniform degree of deformation of different parts of the bar is large, the strain is not uniform, and the center of the bar is easy to overheat. When the hexagonal bar is drawn conventionally, deformation of all parts is uniform, but a large-size bar with the diameter larger than 400mm has a low-magnification structure with a ring-shaped shape due to the fact that a core is not forged thoroughly, and an unreasonable forging method causes the original structure of the bar not to be broken sufficiently, the low-magnification structure of the bar is easy to generate the defects that grains are thick and uneven, and large blocks or strips are distributed in the high-magnification structure and are only equal. These defects will eventually be inherited into the forging, eventually leading to unacceptable forging texture and performance.
Disclosure of Invention
The purpose of the invention is: the method for uniformly deforming the large-size bar with the diameter larger than 400mm is provided, and the uneven deformation and the uneven structure performance in the bar forging process can be improved.
The technical scheme of the invention is as follows:
a structure homogenizing deformation method for large-size titanium alloy bars is characterized by comprising the following steps: the method comprises the following steps:
step one, upsetting, namely heating the bar blank to a forging temperature, and upsetting and deforming the bar blank in a multi-pass local upsetting mode.
And step two, drawing in four directions, namely rotating the bar blank by 90 degrees along the direction vertical to the central line of the bar blank to begin drawing in length, rotating the bar blank by 90 degrees along the direction of the central line of the bar blank by a single hammer to obtain 50-120 mm of rolling reduction, and pressing a second hammer to obtain 50-120 mm of rolling reduction to finish drawing in four directions once.
And step three, changing the square into the eight-square to be drawn out, rotating the rod blank by 45 degrees along the direction of the central line of the rod blank, pressing down by a single hammer for 30-100 mm, repeating the operation for 8 times, realizing the exchange of the edge surfaces, and changing the section into the eight-square.
And step four, chamfering, namely pressing the bar blank by a single hammer for 10-50 mm every time the bar blank rotates by 22.5 degrees along the direction of the central line of the bar blank, and changing the cross section into a sixteen-sided body.
And fifthly, drawing out the hexagonal bar, namely, continuously drawing out the bar material by pressing the bar material by a single hammer for 30-100 mm every time the bar material rotates for 60 degrees along the central line of the bar material.
And step six, chamfering, flatting and rounding.
The diameter of the large-size titanium alloy bar is larger than 400mm, and the height-diameter ratio is smaller than 2.7.
The upsetting deformation in the first step is 50-55%.
And in the second step, the deformation of the square drawing is 30-40% of the total drawing deformation, and the drawing pass is 1-3 times.
The deformation of the three-eight drawing is 30-40% of the total drawing deformation, and the drawing passes are 1-3 times.
The deformation of the fifth hexagonal drawing in the step is 30-40% of the total drawing deformation, and the drawing pass is 1-3 times.
The invention has the advantages that: the invention can lead the deformation of each part of the large-size bar to be uniform, eliminate the deformation dead zone and the overheating of the center and increase the forging permeability and the uniformity of the large-size bar by an upsetting method of accumulating the total deformation through local upsetting and a variable cross-section bar drawing method combining four directions, eight directions and six directions.
Drawings
FIG. 1 is a schematic diagram illustrating the flow of the method for structure-homogenizing deformation of large-gauge titanium alloy bars of the present invention.
Detailed Description
For a clearer understanding of the objects, technical solutions and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
FIG. 1 illustrates the flow of the method for uniform deformation of the structure of a large-size titanium alloy bar. The diameter of the large titanium alloy bar is more than or equal to 400mm, in the embodiment, the forging equipment is a 6000T quick forging machine, the width of an upper hammer head and the width of a lower flat anvil are 550mm, the fillet radius of the flat anvil is 30mm, and the length of the flat anvil is 1500mm. The rod is a round billet with the diameter D equal to 450 mm. As shown in the figure, the method of the present invention comprises the steps of:
step one, upsetting, namely heating a bar blank with the diameter of 680mm multiplied by 1500mm to a forging temperature, and upsetting and deforming the bar blank by 50% by adopting a multi-pass local upsetting mode. The method of multi-pass local upsetting can effectively reduce the pressure required during deformation, and the local small deformation enables the deformation to be more uniform during upsetting.
And step two, square drawing, namely rotating the bar blank by 90 degrees along the direction vertical to the central line of the bar blank to start drawing, wherein the single hammer rolling reduction is 100mm, rotating the bar blank by 90 degrees along the direction of the central line of the bar blank, pressing down a second hammer by 100mm, completing the square drawing of the first pass, rotating the bar blank by 90 degrees along the direction of the central line of the bar blank to start drawing of the second pass, and wherein the single hammer rolling reduction is 70mm. The tetragonal drawing can effectively forge the core part to break the larger original beta crystal grains of the core part.
And step three, changing the square into the eight-square drawing, rotating the rod blank by 45 degrees along the direction of the central line of the rod blank, pressing down by a single hammer for 60mm, totally operating for 8 times, realizing the exchange of edges and faces, changing the section into the eight-square, and finishing the first drawing. And (3) rotating the bar blank by 45 degrees along the direction of the central line of the bar blank, pressing by a single hammer for 60mm, and performing operation for 8 times in total to finish the second-pass drawing. And (3) rotating the bar blank for 45 degrees along the direction of the central line of the bar blank, pressing down for 50mm by a single hammer, and repeating the operation for 8 times to finish the third drawing. The large deformation zone of the square to the octagonal drawing gradually approaches from the center to the edge of the blank, so that the deformation nonuniformity caused by the large deformation drawing of the square can be reduced, the center can be fully deformed after the drawing of the square is carried out, and the deformation of each part can be uniform.
And step four, chamfering, namely pressing the bar blank by a single hammer for 30mm every time the bar blank rotates by 22.5 degrees along the direction of the central line of the bar blank, and changing the section into a sixteen-sided body.
And step five, hexagonal drawing, namely rotating the bar blank by 60 degrees along the direction of the central line of the bar blank, pressing the bar blank by a single hammer for 60mm, and performing operation for 6 times in total to finish first drawing. And (3) rotating the bar blank by 60 degrees along the central line direction of the bar blank, pressing by a single hammer for 50mm, and performing operation for 6 times in total to finish the second drawing. And (3) rotating the bar blank by 60 degrees along the central line direction of the bar blank, pressing down by a single hammer for 50mm, and performing operation for 6 times in total to finish the third drawing.
And sixthly, chamfering, namely pressing the bar blank by a single hammer for 30mm every time the bar blank rotates by 30 degrees along the direction of the central line of the bar blank, and changing the section into a dodecahedron. And (3) flatting, namely rotating the bar material by 90 degrees along the direction vertical to the central line of the bar blank, upsetting the protruding parts at the two ends of the bar material, and rotating the bar material by 90 degrees to return to the position before the flat head. And (4) rounding, namely, pressing the bar down by 8mm every 30 degrees of rotation along the axis of the bar, and rotating the bar for 12 times to round.
The variable cross-section upsetting and drawing method for the large-size titanium alloy bar with the diameter larger than 400mm can enable all parts of the large-size bar to deform uniformly, eliminate deformation dead zones and overheating at the center and increase the forging permeability of the large-size bar.
Claims (6)
1. A structure homogenizing deformation method for large-size titanium alloy bars is characterized by comprising the following steps: the method comprises the following steps:
step one, upsetting, namely heating the bar blank to a forging temperature, and upsetting and deforming the bar blank in a multi-pass local upsetting mode;
step two, drawing in four directions, namely rotating the bar blank by 90 degrees along the direction vertical to the central line of the bar blank to begin drawing, and pressing the bar blank by a single hammer by 50-120 mm, rotating the bar blank by 90 degrees along the direction of the central line of the bar blank, pressing a second hammer by 50-120 mm, and completing drawing in four directions once;
step three, changing the square into the eight-square to be drawn out, rotating the rod blank by 45 degrees along the direction of the central line of the rod blank, pressing down by a single hammer by 30-100 mm, repeating the operation for 8 times, realizing the exchange of the edge surfaces, and changing the section into the eight-square;
chamfering, namely rotating the bar blank for 22.5 degrees along the direction of the central line of the bar blank, pressing down by a single hammer for 10-50 mm, and changing the cross section into a sixteen-sided body;
step five, hexagonal drawing, namely rotating the bar blank for 60 degrees along the direction of the central line of the bar blank, pressing the bar blank by a single hammer for 30-100 mm, and continuing drawing the bar;
and step six, chamfering, flatting and rounding.
2. The method of texturizing a large-gauge titanium alloy bar of claim 1, wherein said large-gauge titanium alloy bar has a diameter greater than 400mm and a height to diameter ratio less than 2.7.
3. The large-gauge titanium alloy bar texture homogenizing deformation method of claim 1, wherein the upsetting deformation amount of the first step is 50% -55%.
4. The method for uniformly deforming the structure of the large-size titanium alloy bar according to claim 1, wherein the deformation amount of the second square drawing is 30-40% of the total drawing deformation amount, and the drawing passes are 1-3 times.
5. The method for carrying out uniform deformation on the structure of the large-size titanium alloy bar according to claim 1, wherein the deformation amount of the three-eight-direction drawing is 30-40% of the total drawing deformation amount, and the drawing passes are 1-3 times.
6. The method for uniformly deforming the structure of the large-size titanium alloy bar according to claim 1, wherein the deformation amount of the quintucial drawing in the step is 30-40% of the total drawing deformation amount, and the drawing passes are 1-3 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210695219.2A CN115156451A (en) | 2022-06-17 | 2022-06-17 | Method for uniform deformation of structure of large-size titanium alloy bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210695219.2A CN115156451A (en) | 2022-06-17 | 2022-06-17 | Method for uniform deformation of structure of large-size titanium alloy bar |
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| CN115156451A true CN115156451A (en) | 2022-10-11 |
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| CN202210695219.2A Pending CN115156451A (en) | 2022-06-17 | 2022-06-17 | Method for uniform deformation of structure of large-size titanium alloy bar |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521670A (en) * | 2013-09-29 | 2014-01-22 | 西北有色金属研究院 | Method for improving titanium alloy swaging forged structure homogeneity |
| CN103938137A (en) * | 2014-04-08 | 2014-07-23 | 中国航空工业集团公司北京航空材料研究院 | Method for changing structure uniformity of large-specification titanium alloy bar |
| US20140260492A1 (en) * | 2013-03-15 | 2014-09-18 | Ati Properties, Inc. | Split-pass open-die forging for hard-to-forge, strain-path sensitive titanium-base and nickel-base alloys |
| CN108262435A (en) * | 2017-12-07 | 2018-07-10 | 中国航发北京航空材料研究院 | A kind of titanium alloy bar stock pulls out forging method |
| CN112275828A (en) * | 2020-10-09 | 2021-01-29 | 中国航发北京航空材料研究院 | Upsetting-drawing deformation method for TB6 titanium alloy large-size bar |
| CN113231589A (en) * | 2021-06-15 | 2021-08-10 | 西部超导材料科技股份有限公司 | Forging method for improving texture uniformity of nickel-based high-temperature alloy difficult to deform |
-
2022
- 2022-06-17 CN CN202210695219.2A patent/CN115156451A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140260492A1 (en) * | 2013-03-15 | 2014-09-18 | Ati Properties, Inc. | Split-pass open-die forging for hard-to-forge, strain-path sensitive titanium-base and nickel-base alloys |
| CN103521670A (en) * | 2013-09-29 | 2014-01-22 | 西北有色金属研究院 | Method for improving titanium alloy swaging forged structure homogeneity |
| CN103938137A (en) * | 2014-04-08 | 2014-07-23 | 中国航空工业集团公司北京航空材料研究院 | Method for changing structure uniformity of large-specification titanium alloy bar |
| CN108262435A (en) * | 2017-12-07 | 2018-07-10 | 中国航发北京航空材料研究院 | A kind of titanium alloy bar stock pulls out forging method |
| CN112275828A (en) * | 2020-10-09 | 2021-01-29 | 中国航发北京航空材料研究院 | Upsetting-drawing deformation method for TB6 titanium alloy large-size bar |
| CN113231589A (en) * | 2021-06-15 | 2021-08-10 | 西部超导材料科技股份有限公司 | Forging method for improving texture uniformity of nickel-based high-temperature alloy difficult to deform |
Non-Patent Citations (1)
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| 冯霞等: "改善钛合金自由锻件组织均匀性的研究" * |
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