CN105382158A - Forming method for large special-shaped alpha-phase titanium alloy multi-step ring piece - Google Patents
Forming method for large special-shaped alpha-phase titanium alloy multi-step ring piece Download PDFInfo
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- CN105382158A CN105382158A CN201510868064.8A CN201510868064A CN105382158A CN 105382158 A CN105382158 A CN 105382158A CN 201510868064 A CN201510868064 A CN 201510868064A CN 105382158 A CN105382158 A CN 105382158A
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- shaped ring
- large scale
- multiple stage
- stage rank
- special
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a forming method for a large special-shaped alpha-phase titanium alloy multi-step ring piece. The forming method includes the steps that an intermediate ring billet is manufactured through the assistance of graphics software, and the intermediate ring billet is placed in a looping mill to be rolled; in the rolling process, a working table top where the intermediate ring billet is located is lifted by 5-10 mm to enable a main roller to make contact with the lower end of the intermediate ring billet firstly, and it is guaranteed that a mold cavity starts to be filled with metal materials from bottom to top to complete forming of all steps gradually; and then the rolled large special-shaped multi-step ring piece is subjected to bulging. By means of the method, the large special-shaped multi-step ring piece can be formed, the rib deviating or rib crossing phenomenon in forming of the large special-shaped multi-step ring piece can be effectively avoided, and therefore the performance of the forged piece is improved. The method is suitable for forming of the large special-shaped alpha-phase titanium alloy multi-step ring piece.
Description
Technical field
The present invention relates to the manufacturing process of the large scale special-shaped ring in a kind of multiple stage rank, particularly relate to the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank.
Background technology
Forging special-shape ring designs according to part outline, the streamline that can effectively improve stock utilization, obtain more satisfactory performance and match with part outline.But the shape of part is often very strange in reality, be difficult to accomplish to design according to part outline completely, the forging special-shape ring close and fairly simple with part section can only be designed to, this method is compared with straight-flanked ring forging, although its stock utilization increases, lifting capacity is limited.At present, the special-shaped ring of roll forming is mostly simple special-shaped ring, such as, only has one, the special-shaped ring of two or three steps.And for the large scale special-shaped ring containing multiple step (more than three), its changes of section is complicated, the designing requirement for blank and mould is very high, seldom has producer to be shaped by Direct Rolling both at home and abroad.
Chinese invention patent description CN102873511A disclosed on 01 16th, 2013 discloses a kind of complex section Ring Radial Rolling manufacturing process having three steps, cylindrical bar sawing is first become the material section of appropriate size by the method, by material section from room temperature be uniformly heated to austenitic temperature and insulation after, through round as a ball, jumping-up die forging becomes two ends to have the pre-forging of shrinkage pool, finally punching in the middle of pre-forging, punching the wad obtains rolling ring blank, blank is being melted down heating, reach target temperature when temperature and take out after insulation, put into the closed pass roll forming of radial machine for rolling ring, the complex section annular forging piece having three steps of regulation geomery is become through too much turning rolling deformation, through normalizing, tempering heat treatment is to ensure mechanical property, finally by forging machining finished product ring.The three step rings that the method is shaped, in the process of rolling, are all plane contact with the contact of mould, are therefore shaped comparatively simple.And for the multiple stage rank abnormity ring of complexity, when adopting the method to be shaped, due to blank or Design of Dies unreasonable, or in the operation of rolling, the coupling of blank and mould is unreasonable, all can have a strong impact on forming effect.
Summary of the invention
The technical problem to be solved in the present invention is to provide the manufacturing process of the large scale special-shaped ring in a kind of alpha titanium alloy multiple stage rank, the method is by preparing adapter ring base to graphics software is auxiliary, and the operation of rolling and Bulging Process are controlled, realize the shaping of the large scale special-shaped ring in alpha titanium alloy multiple stage rank.
For solving the problems of the technologies described above, the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank of the present invention, its technical scheme comprises the following steps:
According to the design feature of the large scale special-shaped ring in alpha titanium alloy multiple stage rank, successively forging cross section is cut by graphics software is equidistant short transverse, obtain multiple stage rank large scale special-shaped ring area of section data and make curve, obtaining the large scale special-shaped ring area of section in multiple stage rank and variation relation highly; Again according to the variation tendency of the large scale special-shaped ring area of section in multiple stage rank with height, and equal-volume principle, by carrying out described point on graphics software, drawing the area of section of adapter ring base and the variation relation curve of height, thus adapter ring base profile and size can be obtained;
Get the alpha titanium alloy bar of certain specification, after being heated to forging temperature, then through jumping-up, punching, roll into straight-flanked ring base in advance; According to profile and the size of adapter ring base, be shaped through fetal membrane and obtain adapter ring base;
Adapter ring base is inserted in the core roller of looping mill, the work top at adapter ring base place is raised 5mm ~ 10mm, until adapter ring base is decontroled after being nipped completely, make adapter ring base be in heeling condition; Drive home roll near adapter ring base, make the lower end in contact of home roll elder generation and adapter ring base; Start looping mill, be rolled, metal material starts to fill mold cavity, and from bottom to top progressively completes the shaping of each step, and in this process, adapter ring base returns to normal condition from heeling condition, obtains special-shaped ring rolled piece;
Special-shaped ring rolled piece is loaded shape expanding machine, and the target size of bulging for benchmark, carries out bulging to special-shaped ring rolled piece with the bottom diameter of the large scale special-shaped ring in multiple stage rank, after reaching target size, keeps 20s ~ 30s, obtains the large scale special-shaped ring in multiple stage rank.
The profile of described home roll makes according to multiple stage rank large scale special-shaped ring external diameter profile, the height H of home roll
1=H
forging× (1+ Φ)+ρ
1, in formula, H
forgingfor the large scale special-shaped ring height in multiple stage rank, Φ is the percent thermal shrinkage of material, ρ
1for the altimetric compensation amount of home roll; ρ
1be evenly distributed on the two ends up and down of home roll.
The profile of described core roller makes according to multiple stage rank large scale special-shaped ring internal diameter profile, the height H of core roller
2=H
forging× (1+ Φ)+ρ
2, in formula, H
forgingfor the large scale special-shaped ring height in multiple stage rank, Φ is the percent thermal shrinkage of material, ρ
2for the altimetric compensation amount of core roller; ρ
2be evenly distributed on the two ends up and down of core roller.
The external diameter R '=R-ε of described special-shaped ring rolled piece, in formula, R is the external diameter of the large scale special-shaped ring in multiple stage rank, and ε is follow-up bulging deflection; The internal diameter r '=r-ε of described special-shaped ring rolled piece, in formula, r is the external diameter of the large scale special-shaped ring in multiple stage rank, and ε is follow-up bulging deflection.
The target size r of described bulging
2=r
1× (1+ Φ)+δ, in formula, r
1for the bottom diameter of the large scale special-shaped ring in multiple stage rank, Φ is the percent thermal shrinkage of material, and δ is springback compensation amount.
Described alpha titanium alloy is TA7 alloy, and its percent thermal shrinkage Φ is 0.7%.
Compared with prior art, beneficial effect of the present invention is as follows:
The manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank of the present invention, by adopting graphics software Computer Aided Design adapter ring base, the area of section of the large scale special-shaped ring of the area of section of adapter ring base and multiple stage rank is consistent substantially, overcome this large scale special-shaped ring abrupt change of cross-section region, multiple stage rank more, be difficult to the difficult point be shaped.
In the operation of rolling, the work top at adapter ring base place is raised 5mm ~ 10mm, make home roll elder generation and the lower end in contact of intermediate blank, ensure that each step of the large scale special-shaped ring in multiple stage rank is from bottom to top filled smoothly, there will not be the phenomenon such as inclined muscle, string muscle.Home roll and core roller with the addition of ρ respectively
1, ρ
2compensation rate, prevent from occurring during special-shaped ring rolling climbing roller phenomenon, cause inclined muscle or string muscle.Inside/outside diameter size all little ε compared with the large scale special-shaped ring in multiple stage rank of the special-shaped ring rolled piece that rolling obtains, for follow-up bulging has left surplus.
In Bulging Process, leave the springback compensation amount of δ size, ensure that the size of the final large scale special-shaped ring in alpha titanium alloy multiple stage rank be shaped.
Take the trade mark as the large scale special-shaped ring in alpha titanium alloy multiple stage rank of TA7 be example:
The defect such as this inclined muscle of large scale special-shaped ring in alloy multiple stage rank or string muscle after testing, appearance and size is complete.
The room temperature tensile properties of this large scale special-shaped ring in alloy multiple stage rank after testing, its tensile strength is 1125Mpa ~ 1136Mpa (being greater than the 1100Mpa of instructions for use), its tensile strength is 745MPa (being greater than the 706.5MPa of design instructions for use), and elongation after fracture was 6% (being greater than 5% of design instructions for use).
The testing result of the drawing by high temperature duration running of this large scale special-shaped ring in alloy multiple stage rank also all meets technical conditions requirement after testing.
Above-mentioned testing result shows, the large scale special-shaped ring property indices in TA7 multiple stage rank adopting manufacturing process 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 large scale special-shaped ring structural representations in multiple stage rank.
Fig. 2 is the variation relation curve of the area of section-height of the large scale special-shaped ring in multiple stage rank and adapter ring base.
Fig. 3 is first time fetal membrane forging schematic diagram.
Fig. 4 is second time fetal membrane forging schematic diagram.
Fig. 5 is rolling forming process schematic diagram.
Fig. 6 is special-shaped ring rolled piece structural representation.
Detailed description of the invention
The manufacturing process implementing the large scale special-shaped ring in alpha titanium alloy multiple stage rank of the present invention needs to provide the equipment such as forge furnace, forcing press, machine for rolling ring, shape expanding machine, manipulator.The alpha titanium alloy being TA7 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 4.0% ~ 6.0%, containing Sn amount 2.0% ~ 3.0%, containing Fe amount≤0.50%, C content≤0.10%, leaded wastewater≤0.05%, containing H amount≤0.015%, containing O amount≤0.20%, surplus is Ti, other element summation≤0.40.
The step of this method is as follows:
Step 1: prepare adapter ring base
As shown in Figure 1, according to the design feature of the large scale special-shaped ring 1 in alpha titanium alloy multiple stage rank, successively forging cross section is cut by graphics software is equidistant short transverse, obtain multiple stage rank large scale special-shaped ring 1 area of section data and make curve 2, as shown in Figure 2, thus obtain multiple stage rank large scale special-shaped ring 1 area of section with height variation relation; Again according to the variation tendency of multiple stage rank large scale special-shaped ring 1 area of section with height, and equal-volume principle, by carrying out described point on graphics software, drawing the area of section of adapter ring base 5 and the variation relation curve 3 of height, thus adapter ring base 5 profile and size can be obtained.
Get the alpha titanium alloy bar of certain specification, after being heated to forging temperature, then through jumping-up, punching, roll into straight-flanked ring base 4 in advance; Straight-flanked ring base 4 is put into fetal membrane 7, as shown in Figure 3, gets little drift 8 pairs of straight-flanked ring bases 4 and carry out first time extruding; Again drift 8 is taken out, put into cushion block 10 in the bottom of fetal membrane 7, as shown in Figure 4, get the large drift 9 of replacing and carry out second time extruding, obtain adapter ring base 5.
Step 2: roll forming
Be inserted in by adapter ring base 5 in the core roller 12 of looping mill, the profile of core roller 12 makes according to the internal diameter profile of the large scale special-shaped ring 1 in multiple stage rank, the height H of core roller 12
2=H
forging× (1+ Φ)+ρ
2, (in formula, H
forgingfor the large scale special-shaped ring height in multiple stage rank, Φ is the percent thermal shrinkage of material, ρ
2altimetric compensation amount for core roller); ρ
2be evenly distributed on the two ends up and down of core roller 12; The work top at adapter ring base 5 place is raised 5mm ~ 10mm, until adapter ring base 5 is decontroled after being nipped completely, makes adapter ring base 5 be in heeling condition; Drive home roll 11 near adapter ring base 5, make the lower end in contact of home roll 11 elder generation and adapter ring base 5; The profile of home roll 11 makes according to the external diameter profile of the large scale special-shaped ring 1 in multiple stage rank, the height H of home roll 11
1=H
forging× (1+ Φ)+ρ
1, (in formula, H
forgingfor the large scale special-shaped ring height in multiple stage rank, Φ is the percent thermal shrinkage of material, ρ
1altimetric compensation amount for home roll); ρ
1be evenly distributed on the two ends up and down of home roll 11.Start looping mill, be rolled, metal material starts to fill mold cavity, and from bottom to top progressively complete the shaping of each step, in this process, adapter ring base 5 returns to normal condition from heeling condition, obtain special-shaped ring rolled piece 6, the external diameter R '=R-ε of special-shaped ring rolled piece 6, (in formula, R is the external diameter of the large scale special-shaped ring in multiple stage rank, ε is follow-up bulging deflection), the internal diameter r '=r-ε of special-shaped ring rolled piece, (in formula, r is the external diameter of the large scale special-shaped ring in multiple stage rank, and ε is follow-up bulging deflection).
Step 3: expansion forming
Special-shaped ring rolled piece 6 is loaded shape expanding machine, and the target size of bulging for benchmark, carries out bulging to special-shaped ring rolled piece 6 with the bottom diameter of the large scale special-shaped ring 1 in multiple stage rank, after reaching target size, keeps 20s ~ 30s, obtains the large scale special-shaped ring 1 in multiple stage rank.The target size r of described bulging
2=r
1× (1+ Φ)+δ, (in formula, r
1for the bottom diameter of the large scale special-shaped ring in multiple stage rank, Φ is the percent thermal shrinkage of material, and δ is springback compensation amount).
Above-mentioned alpha titanium alloy is TA7 alloy, and its percent thermal shrinkage Φ is 0.7%.
Claims (6)
1. a manufacturing process for the large scale special-shaped ring in alpha titanium alloy multiple stage rank, is characterized in that, comprise the following steps:
According to the design feature of the large scale special-shaped ring in alpha titanium alloy multiple stage rank, successively forging cross section is cut by graphics software is equidistant short transverse, obtain multiple stage rank large scale special-shaped ring area of section data and make curve, obtaining the large scale special-shaped ring area of section in multiple stage rank and variation relation highly; Again according to the variation tendency of the large scale special-shaped ring area of section in multiple stage rank with height, and equal-volume principle, by carrying out described point on graphics software, drawing the area of section of adapter ring base and the variation relation curve of height, thus adapter ring base profile and size can be obtained;
Get the alpha titanium alloy bar of certain specification, after being heated to forging temperature, then through jumping-up, punching, roll into straight-flanked ring base in advance; According to profile and the size of adapter ring base, be shaped through fetal membrane and obtain adapter ring base;
Adapter ring base is inserted in the core roller of looping mill, the work top at adapter ring base place is raised 5mm ~ 10mm, until adapter ring base is decontroled after being nipped completely, make adapter ring base be in heeling condition; Drive home roll near adapter ring base, make the lower end in contact of home roll elder generation and adapter ring base; Start looping mill, be rolled, metal material starts to fill mold cavity, and from bottom to top progressively completes the shaping of each step, and in this process, adapter ring base returns to normal condition from heeling condition, obtains special-shaped ring rolled piece;
Special-shaped ring rolled piece is loaded shape expanding machine, and the target size of bulging for benchmark, carries out bulging to special-shaped ring rolled piece with the bottom diameter of the large scale special-shaped ring in multiple stage rank, after reaching target size, keeps 20s ~ 30s, obtains the large scale special-shaped ring in multiple stage rank.
2. the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank according to claim 1, is characterized in that, described alpha titanium alloy is TA7 alloy, and its percent thermal shrinkage Φ is 0.7%.
3. the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank according to claim 1 and 2, is characterized in that, the profile of described home roll makes according to multiple stage rank large scale special-shaped ring external diameter profile, the height H of home roll
1=H
forging× (1+ Φ)+ρ
1, in formula, H
forgingfor the large scale special-shaped ring height in multiple stage rank, Φ is the percent thermal shrinkage of material, ρ
1for the altimetric compensation amount of home roll; ρ
1be evenly distributed on the two ends up and down of home roll.
4. the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank according to claim 1 and 2, is characterized in that, the profile of described core roller makes according to multiple stage rank large scale special-shaped ring internal diameter profile, the height H of core roller
2=H
forging× (1+ Φ)+ρ
2, in formula, H
forgingfor the large scale special-shaped ring height in multiple stage rank, Φ is the percent thermal shrinkage of material, ρ
2for the altimetric compensation amount of core roller; ρ
2be evenly distributed on the two ends up and down of core roller.
5. the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank according to claim 1 and 2, is characterized in that, the external diameter R '=R-ε of described special-shaped ring rolled piece, and in formula, R is the external diameter of the large scale special-shaped ring in multiple stage rank, and ε is follow-up bulging deflection; The internal diameter r '=r-ε of described special-shaped ring rolled piece, in formula, r is the external diameter of the large scale special-shaped ring in multiple stage rank, and ε is follow-up bulging deflection.
6. the manufacturing process of the large scale special-shaped ring in alpha titanium alloy multiple stage rank according to claim 1 and 2, is characterized in that, the target size r of described bulging
2=r
1× (1+ Φ)+δ, in formula, r
1for the bottom diameter of the large scale special-shaped ring in multiple stage rank, Φ is the percent thermal shrinkage of material, and δ is springback compensation amount.
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|---|---|---|---|
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|---|---|---|---|
| CN201510868064.8A CN105382158A (en) | 2015-12-02 | 2015-12-02 | Forming method for large special-shaped alpha-phase titanium alloy multi-step ring piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108247288A (en) * | 2017-12-18 | 2018-07-06 | 贵州航宇科技发展股份有限公司 | A kind of machining manufacture of Ti6242 titanium alloy thin walls ring |
| CN112371888A (en) * | 2020-09-30 | 2021-02-19 | 贵州安大航空锻造有限责任公司 | Ti2Method for forming AlNb-based alloy complex-section special-shaped casing ring piece |
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| CN104550583A (en) * | 2014-12-15 | 2015-04-29 | 贵州安大航空锻造有限责任公司 | Method for rolling and forming alpha-phase titanium alloy thick-wall ring forging |
| CN105033125A (en) * | 2015-06-08 | 2015-11-11 | 西北工业大学 | Titanium alloy equal-thickness thin-wall special-shaped annular piece rolling and expanding composite forming method |
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2015
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Patent Citations (5)
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|---|---|---|---|---|
| RU2185914C2 (en) * | 1999-06-29 | 2002-07-27 | Процив Юрий Васильевич | Method for making annular articles |
| JP2003230927A (en) * | 2002-02-14 | 2003-08-19 | Sanyo Special Steel Co Ltd | Rough shape material for bearing ring reduced in quenching strain and its manufacturing method |
| CN103691855A (en) * | 2013-12-16 | 2014-04-02 | 贵州安大航空锻造有限责任公司 | Method for rolling rectangular structural steel ring blank to form irregularly-shaped thin-walled ring part |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108247288A (en) * | 2017-12-18 | 2018-07-06 | 贵州航宇科技发展股份有限公司 | A kind of machining manufacture of Ti6242 titanium alloy thin walls ring |
| CN112371888A (en) * | 2020-09-30 | 2021-02-19 | 贵州安大航空锻造有限责任公司 | Ti2Method for forming AlNb-based alloy complex-section special-shaped casing ring piece |
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Application publication date: 20160309 |