CN101284296A - Rolling and shaping method of titanium alloy taper ring forged piece - Google Patents

Rolling and shaping method of titanium alloy taper ring forged piece Download PDF

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Publication number
CN101284296A
CN101284296A CNA2008100687259A CN200810068725A CN101284296A CN 101284296 A CN101284296 A CN 101284296A CN A2008100687259 A CNA2008100687259 A CN A2008100687259A CN 200810068725 A CN200810068725 A CN 200810068725A CN 101284296 A CN101284296 A CN 101284296A
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rolling
ring
taper
roll
shaping
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CN100574925C (en
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吴永安
刘朝辉
田永军
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Guizhou Aviation Technical Development Co ltd
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Guizhou Hangyu Science & Technology Development Co Ltd
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Abstract

The invention discloses a method for rolling and shaping titanium alloy tapered-ring forge pieces. In order to obtain the titanium alloy tapered-ring forge piece with good organization and performance, and realize precise rolling, the method comprises the following steps: an alloy bar is subjected to heating and continuous upsetting, deformed by 50%-55%, made into solid cake, and then subjected to punching to cause the hole diameter to be 30%-35% of the outer diameter thereof so as to obtain a hollow cake; the hollow cake is subjected to heating and rolling and deformed by 20%-25% to obtain a rectangular ring blank; the rectangular ring blank is subjected to heating and rolling and deformed by 30%-35% to obtain a rectangular pre-rolling blank; the pre-rolling blank is subjected to heating, loaded in the rolling mould of a ring rolling mill, rolled in the tapered hole of the rolling mould, and deformed by 25%-30% to obtain the tapered-ring forge piece. When being rolled, the widening speed of the pre-rolling blank along radial direction is 2mm/s-15mm/s, and the received radial roll force is 40000kg-220000kg. The method is mainly used for shaping the tapered-ring forge piece of an aeroengine. By the method, the tapered-ring forge piece, the ring surface of which is a complex curved surface and distributed in a streamline form along the shape of the piece, can be obtained.

Description

The method for rolling and shaping of titanium alloy taper ring forged piece
Technical field
The present invention relates to a kind of roll-forming method of annular forging piece, particularly related to the method for rolling and shaping of titanium alloy taper ring forged piece.
Background technology
The aero-engine taper ring forged piece that adopts titanium alloy (as material trademarks such as TC4) to make owing at high temperature work for a long time, requires forging to have preferable performance and structure stability as parts such as turbine outer shroud, casings.
" new technology and numerical simulation thereof are made in the moulding of large cone ring " (Wang Zewu etc., " Nuclear Power Engineering ", the 28th the 2nd phase of volume, the 69th～72 page, in April, 2007) literary composition discloses a kind of forming technology of taper ring, and this technology comprises base, heating, rolling and following process.Be home roll, core roller when adopting the taper ring of the rolling common straightcarbon steel of this technology and embrace and again the conical ring base is rolled into the taper ring after a roller is processed into taper machine for rolling ring.Adopt the rolling taper ring of this technology, owing to be the conical surface shape of determining the taper ring by the conical surface shape of home roll, core roller and armful roller, by rolling its height of awl roller, therefore, can only rolling inside and outside anchor ring be the simple tapers ring (as this article is illustrated) of burnishing surface, and for tapering or highly different taper ring, need more roll changing type, as this article pointed " the taper ring is different from the square-section ring; ring has constant slope in the axial direction, needs redesign home roll, core roller and embraces roller ".Hence one can see that, and adopting this technology can not roll out inside and outside anchor ring is complex-curved taper ring, and frequently during rolling difform simple tapers ring change the maintaining that roll shape will increase manufacturing cost, extends manufacture cycle and be unfavorable for equipment.
The concrete processing step of new technology and unexposed rolling titanium alloy taper ring forged piece is made in above-mentioned taper ring moulding, if adopt the rolling titanium alloy taper ring forged piece of this technology, the problem of existence is as follows:
Can not rolling anchor ring be complex-curved and be the taper ring forged piece of streamline distribution along the part profile, therefore, when the rolling anchor ring of needs is complex-curved taper ring forged piece, can only be rolled into the anchor ring that this article announces by the method that increases allowance earlier is the taper ring forged piece of burnishing surface, is complex-curved taper ring forged piece by being machined to anchor ring again.The taper ring forged piece that processes like this, the allowance of ring rolling spare blank is big, and the forging ' s block dimension precision is relatively poor, and the profile streamline of forging can not distribute along the part profile; Because processing capacity is bigger, both wasted time and energy and waste a large amount of valuable titanium alloy materials, thereby the profile streamline that has cut off forging again has a negative impact to the tissue and the performance of forging.
During rolling titanium alloy taper ring forged piece, expect from alloy bar and finally to be rolled into taper ring forged piece, the deflection of titanium alloy is very big to the tissue and the performance impact of ring rolling spare, its deflection is selected inaccurate, will cause that ring rolling spare crystal grain is thick, tissue makes a variation, run over and injure, roll split, fold, defective such as interlayer, thereby influence the payment and the use of forging.
In view of this, the invention provides a kind of method for rolling and shaping of titanium alloy taper ring forged piece.
Summary of the invention
The technical problem to be solved in the present invention provides the method that a kind of deflection is accurately realized the accurate rolling and shaping of titanium alloy taper ring forged piece, adopts the taper ring forged piece of this method roll off to be streamline distribution along the part profile, and has good tissue and performance.
For solving the problems of the technologies described above, the method for rolling and shaping of titanium alloy taper ring forged piece of the present invention, its technical scheme may further comprise the steps:
Titanium alloy bar by the specification blanking is heated to below the transformation temperature 30 ℃ deformation temperature, makes its distortion 50%～55% obtain solid cake through jumping-up; Described solid cake punching make its aperture size be its outside dimension 30%～35% after obtain hollow cake;
Heat and obtain the straight-flanked ring base after described hollow cake makes after the above-mentioned deformation temperature it be rolled annular strain 20%～25%; Described straight-flanked ring base is heated to be rolled once more after the above-mentioned deformation temperature obtains the pre-strip plate of rectangle after ring makes its distortion 30%～35%;
Heat described pre-strip plate to above-mentioned deformation temperature, described pre-strip plate is put into machine for rolling ring roll off mould, the longitudinal cross-section of described pre-strip plate produces the continuous local plastic distortion by the machine for rolling ring roll off and by described pass in the taper pass of roll off mould, described pre-strip plate wall thickness reduce and radially broadening become taper ring forged piece after by roll off distortion 25%～30%.
When the taper surface of the roll off mould that constitutes above-mentioned taper pass was curved surface, the anchor ring of the taper ring forged piece of rolling and shaping was a curved surface; When the taper surface of the roll off mould that constitutes above-mentioned taper pass was burnishing surface, the anchor ring of the taper ring forged piece of rolling and shaping was a burnishing surface.
During roll off, above-mentioned pre-strip plate broadening speed radially is 2mm/s～15mm/s, and the radial rolling power that is subjected to is 40000kg～220000kg.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention is by the titanium alloy bar of the specification blanking whole technical process from jumping-up, punching, the pre-strip plate of system to the tapered ring rolling spare of roll off, deflection is shaped taper ring forged piece with use roll off mould by selecting for use accurately, has obtained the taper ring forged piece of even tissue and function admirable.The titanium alloy that with the trade mark is TC4 is an example, and the metallographic macrostructure of this alloy taper ring forged piece different parts after testing finds no defectives such as coarse-grain, crackle, scar, folding, interlayer; Its high power metallographic structure after testing, obtained the uniform tissue structure, and find no defectives such as coarse-grain, tissue variation, segregation, the room temperature tensile performance of this alloy taper ring forged piece after testing, its tensile strength is 965MPa～975MPa (greater than the 895MPa of instructions for use), and its percentage elongation is that 0.2% o'clock yield strength is 955MPa (greater than the 825MPa of instructions for use); Elongation after fracture be 11%～15% (greater than instructions for use 10%); The high temperature tensile properties of this alloy taper ring forged piece after testing, it is that 400 ℃, proof stress were not broken 570MPa, duration (greater than 100 hours of instructions for use) in 101 hours in test temperature; This alloy taper ring rolling after testing. the Brinell hardness of part is 278, has satisfied instructions for use.From the physics and chemistry testing result of this alloy taper ring forged piece as can be known, adopt this alloy taper ring forged piece of said method rolling and shaping to obtain unforeseeable technique effect, satisfied its instructions for use greatly.
Twice looping mill rolling of mode that the present invention adopts the small deformation amount to be shaped made pre-strip plate and rolling and shaping taper ring forged piece, can avoid this alloy occurrence temperature when rolling ring and roll off to raise, tissue variation, crystal grain is thick and defective such as crackle, has obtained the taper ring forged piece of even tissue and function admirable.
The present invention is also by installing the rolling and shaping that the roll off mould is realized titanium alloy taper ring forged piece on machine for rolling ring, i.e. mounting core roller die on the core roller of machine for rolling ring, the home roll mould is installed on its home roll, can be formed for the taper pass of roll off taper ring forged piece behind core roller die and the home roll mould matched moulds, thereby the forming mode of taper ring forged piece by home roll, core roller and awl roller rolling and shaping are improved to mainly by the mould rolling and shaping, and the shape of the taper surface of the roll off mould by change constituting described taper pass, but the just taper ring forged piece of the different torus shape of rolling and shaping, thereby make this mould go out the taper ring forged piece that anchor ring is curved surface or burnishing surface by roll off.
And, adopt this method roll off titanium alloy taper ring forged piece, the anchor ring that can obtain to distribute along the part profile is the taper ring forged piece of complex-curved streamline, improved the dimensional accuracy of taper ring forged piece, thereby can realize accurately rollingly, reduce the machine-finish allowance of taper ring forged piece and the waste of valuable titanium alloy material; When the ring rolling spare of the different torus shape of roll off, only needing to change the module that forms described taper pass on the roll off mould gets final product, and needn't change the home roll, core roller of machine for rolling ring and embrace parts such as roller, thereby can reduce taper ring forged piece manufacturing cost, shorten the production cycle and help the maintaining of equipment.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the blank-making technology flow chart of the pre-strip plate of rectangle.
Fig. 2 is the structure chart that the pre-strip plate of rectangle is put into the roll off mould.
Fig. 3 is the process drawing of the tapered ring rolling spare of pre-strip plate roll off.
Fig. 4 be roll off technical process shown in Figure 3 overlook the direction schematic diagram.
Fig. 5 is the profilograph of the taper ring forged piece of rolling and shaping along its center line.
Fig. 6 (a) is the metallographic macrostructure figure at a shown in Figure 5 position.
Fig. 6 (b) is the metallographic macrostructure figure at b shown in Figure 5 position.
Fig. 6 (a ') is the metallographic mirco structure figure at a shown in Figure 5 position.
Fig. 6 (b ') is the metallographic mirco structure figure at b shown in Figure 5 position.
Fig. 7 (a) is the roll off mould pass figure of second kind of structure.
Fig. 7 (b) adopts taper ring forged piece that the roll off mould pass shown in Fig. 7 (a) the rolls into profilograph along its center line.
Fig. 8 (a) is the roll off mould pass figure of the third structure.
Fig. 8 (b) adopts taper ring forged piece that the roll off mould pass shown in Fig. 8 (a) the rolls into profilograph along its center line.
Fig. 9 (a) is the roll off mould pass figure of the 4th kind of structure.
Fig. 9 (b) adopts taper ring forged piece that the roll off mould pass shown in Fig. 9 (a) the rolls into profilograph along its center line.
The specific embodiment
The method for rolling and shaping of implementing titanium alloy taper ring forged piece of the present invention need provide equipment such as forge furnace, forcing press, machine for rolling ring, manipulator.The titanium alloy that with the trade mark is TC4 below is the specific embodiment that example describes this method in detail:
The main chemical elements content (percentage by weight) of this titanium alloy is: contain Al amount 5.50%～6.80%, V content 3.50%～4.50%, contain Fe amount≤0.30%, C content≤0.10%, contain O amount≤0.20%, contain N amount≤0.05%, contain H amount≤0.015%, contain other trace elements in addition, surplus is Ti.
This alloy is as follows to the processing step of producing qualified taper ring forged piece from bar:
Step 1: the base of the pre-strip plate of rectangle.As shown in Figure 1, is the trade mark by the specification blanking that the titanium alloy bar 1 of TC4 is heated to below the transformation temperature 30 ℃ in forge furnace, jumping-up makes its distortion 50%～55% obtain solid cake 2 on forging press, then solid cake 2 usefulness drifts 4 are gone out centre bore obtains hollow cake 3, and the internal diameter size of described hollow cake 3 is 30%～35% of its outside dimensions; Hollow cake 3 is heated to again puts into machine for rolling ring behind the said temperature and roll ring and make its distortion 20%～25% back be become straight-flanked ring base 5 by looping mill rolling for the first time; Straight-flanked ring base 5 is heated to again puts into machine for rolling ring behind the said temperature and roll ring and make its distortion 30%～35% back be become the pre-strip plate 10 of rectangle by looping mill rolling for the second time.
In above-mentioned steps 1, the pre-strip plate 10 of rectangle that adopts above-mentioned mode of texturing to make can obtain uniform tissue, particularly twice looping mill rolling taked the mode that the small deformation amount is shaped, can avoid this alloy occurrence temperature when rolling ring to raise, tissue variation, crystal grain is thick and defective such as crackle, thereby helps making the finish to gauge taper ring forged piece to obtain favorable tissue and performance.
Step 2: the rolling and shaping of taper ring forged piece:
Earlier pre-strip plate 10 is heated in forge furnace and puts into the roll off mould of forming by home roll mould and core roller die below the transformation temperature after 30 ℃, as shown in Figure 2, these pre-strip plate 10 usefulness manipulators are contained on the interior pattern piece 16 of core roller die and lie in (not shown) on the chassis of machine for rolling ring, described core roller die is fixed on the core roller 12 by nut 23 and core roller key 24 by interior pattern piece 16, core retainer plate 21, pressure ring 22; Starting machine for rolling ring makes its home roll 13 rotate by direction shown in Figure 2, make core roller 12 core roller die and home roll mould matched moulds after home roll 13 direction translations are near home roll 13 then, described home roll mould mountain bottom end cover 19, external form module 17, upper end cover 18 are fixed on the home roll 13 by home roll cover 20 and home roll key 25, the outer peripheral face and the described upper and lower end cap 18 and 19 of pattern piece 16 and external form module 17 surround taper pass 11 in described, and the longitudinal cross-section of pre-strip plate 10 is in this taper pass 11; Simultaneously drive upper and lower awl roller 14 and 15 and rotate and prepare to clamp the upper and lower end face of pre-strip plate 10, make two of machine for rolling ring to embrace the outer shroud side face that rollers 26 (as shown in Figure 4) help pre-strip plate 10 by direction shown in Figure 2 by machine for rolling ring;
Home roll 13 drives pre-strip plate 10, core roller 12 and two and embraces rollers 26 and press Fig. 3 and direction rotation shown in Figure 4, and at this moment the upper and lower awl roller 14 and 15 of the Zhuan Donging upper and lower end face that clamps the pre-strip plate 10 of rotation therewith rotates; Core roller 12 radially makes core roller 12 and the home roll 13 roll-force pre-strip plate 10 of roll off in its taper pass 11 with 40000kg～220000kg towards home roll 13 directions do feed motion, pre-strip plate 10 is with the speed of 2mm/s～15mm/s broadening radially, its wall thickness reduces gradually, and upper and lower awl roller 14 and 15 and two armfuls of rollers 26 move outward along with the radially broadening of pre-strip plate 10;
Pre-strip plate 10 is produced the continuous local plastic distortion by roll off in taper pass 11, last pre-strip plate 10 becomes taper ring forged piece 27 after 11 internal strains 25%～30% of taper pass, remove home roll 13, awl roller 14 and 15, two machine for rolling ring cantilevers of embracing roller 26 and being pressed in core roller 12 tops after all rotatable parts stop, taking out taper ring forged piece 27 from core roller top.
In above-mentioned steps 2, the mode that taper ring forged piece takes the small deformation amount to be shaped can avoid this alloy occurrence temperature when roll off to raise, and the tissue variation, crystal grain is thick and defective such as crackle, obtains the ring rolling spare of even tissue and function admirable.
In above-mentioned steps 1 and step 2, the finish-forging of this alloy or finishing temperature are not less than 850 ℃.
As shown in Figure 5, the outer ring surface of taper ring forged piece 27 be by the outer shroud of its top c face directly, the outer shroud of the outer shroud inclined-plane of middle part d and bottom e faces the curved surface that the order according to c, d, e links together by the transition of circular arc nature directly, its inner ring surface be by the interior ring of its top c face directly, the interior ring of the interior ring inclined-plane of middle part d and bottom e faces the curved surface that the order according to c, d, e links together by the transition of circular arc nature directly.
Detect according to GB/T 5168 " the diphasic titanium alloy high-low time tissue method of inspection ", the metallographic macrostructure of this taper ring forged piece is shown in Fig. 6 (a) and Fig. 6 (b), wherein the sample of Fig. 6 (a) and Fig. 6 (b) is taken from a and the b position among Fig. 5 respectively, all finds no crackle, shrinkage cavity, pore on above-mentioned macrostructure figure, is mingled with, metallurgical imperfection such as segregation; The metallographic mirco structure of this taper ring forged piece (microscopically amplifies 500 times) is shown in Fig. 6 (a ') and Fig. 6 (b '), wherein the sample of Fig. 6 (a ') and Fig. 6 (b ') is taken from a and the b position among Fig. 5 respectively, its even tissue as seen from the figure, and find no defectives such as coarse-grain, tissue variation, segregation.
Detect according to GB/T 228 " metal material tensile test at room temperature method ", the room temperature tensile strength of this alloy taper ring forged piece is 965MPa～975MPa, and its percentage elongation is that 0.2% o'clock yield strength is 955MPa, and elongation after fracture is 11%～15%.
Detecting this taper ring rolling according to GB/T 4338 " metallic high temperature stretching test method ". part is that 400 ℃, proof stress are that 70MPa, duration are disconnected in 101 hours in test temperature.
Detect according to GB/T231.1 " metal Brinell hardness test method ", the Brinell hardness of this taper ring forged piece is 278.
Above-mentioned physics and chemistry testing result shows, adopts this alloy taper ring forged piece of said method rolling and shaping to have good interior tissue and performance, has satisfied the instructions for use of this alloy forged piece fully.
Fig. 7 (a) shows the taper ring forged piece 27 shown in rolling Fig. 7 (b) aThe taper pass 11 of roll off mould aStructure, in Fig. 7 (a), pattern piece 16 in only needing change the interior pattern piece 16 among Fig. 2 or Fig. 3 and external form module 17 respectively into aWith external form module 17 aGet final product the taper ring forged piece 27 of rolling and shaping aInside and outside anchor ring be burnishing surface.
Fig. 8 (a) shows the taper ring forged piece 27 shown in rolling Fig. 8 (b) bThe taper pass 11 of roll off mould bStructure, in Fig. 8 (a), pattern piece 16 in only needing change the interior pattern piece 16 among Fig. 2 or Fig. 3 and external form module 17 respectively into bWith external form module 17 bGet final product.Taper ring forged piece 27 bOuter ring surface be by the outer ring surface of the protruding ring of the outer shroud inclined-plane of the outer ring surface of the protruding ring of its top c ', middle part d ' and bottom e ' by the transition of circular arc nature link together complex-curved, its inner ring surface is to face the curved surface that is connected by the natural transition of circular arc with the interior ring inclined-plane of middle part d ', bottom e ' directly by the interior ring of top c '.
Fig. 9 (a) shows the taper ring forged piece 27 shown in rolling Fig. 9 (b) cThe structure of taper pass 11c of roll off mould, in Fig. 9 (a), pattern piece 16 in only needing change the interior pattern piece 16 among Fig. 2 or Fig. 3 and external form module 17 respectively into cWith external form module 17 cGet final product.The taper ring forged piece 27 of rolling and shaping cIts inner ring surface is to face the curved surface that is connected by the transition of circular arc nature with the order at g, h, i, j, k position with the interior ring inclined-plane at h, j position directly by the interior ring at this forging g, i, k position, and its outer ring surface is that the outer shroud at mountain this forging g, i, k position is faced the curved surface that is connected by the natural transition of circular arc with the order at g, h, i, j, k position with the outer shroud inclined-plane at h, j position directly.
From Fig. 7 (a), Fig. 8 (a) and Fig. 9 (a) as can be seen, adopting the titanium alloy taper ring forged piece of above-mentioned method for rolling and shaping and roll off mould roll off different cross section is very easily.When the taper ring forged piece tapering of rolling and shaping is big, can adds the pre-strip plate of the rectangle of above-mentioned steps 1 go out certain gradient or go out certain tapering by machine, the more tapered ring rolling spare of method roll off that provides by above-mentioned steps 2 by bulging.Rolling and shaping of the present invention is the forming mode that the pre-strip plate of ring rolling spare is rolled into ring rolling spare by the roll off mould.

Claims (5)

1, a kind of method for rolling and shaping of titanium alloy taper ring forged piece is characterized in that, may further comprise the steps:
Titanium alloy bar by the specification blanking is heated to below the transformation temperature 30 ℃ deformation temperature, makes its distortion 50%～55% obtain solid cake through jumping-up; Described solid cake punching make its aperture size be its outside dimension 30%～35% after obtain hollow cake;
Heat and obtain the straight-flanked ring base after described hollow cake makes after the above-mentioned deformation temperature it be rolled annular strain 20%～25%; Described straight-flanked ring base is heated to be rolled once more after the above-mentioned deformation temperature obtains the pre-strip plate of rectangle after ring makes its distortion 30%～35%;
Heat described pre-strip plate to above-mentioned deformation temperature, described pre-strip plate is put into machine for rolling ring roll off mould, the longitudinal cross-section of described pre-strip plate produces the continuous local plastic distortion by the machine for rolling ring roll off and by described pass in the taper pass of roll off mould, described pre-strip plate wall thickness reduce and radially broadening become taper ring forged piece after by roll off distortion 25%～30%.
2, according to the described method for rolling and shaping of claim 1, it is characterized in that: the taper surface that constitutes the roll off mould of described taper pass is a curved surface.
3, according to the described method for rolling and shaping of claim 1, it is characterized in that: the taper surface that constitutes the roll off mould of described taper pass is a burnishing surface.
4, according to the described method for rolling and shaping of claim 1, it is characterized in that: described pre-strip plate broadening speed radially is 2mm/s～15mm/s.
5, according to the described method for rolling and shaping of claim 1, it is characterized in that: the radial rolling power that described pre-strip plate is subjected to is 40000kg～220000kg.
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CN110842120B (en) * 2019-10-10 2021-05-07 西北工业大学太仓长三角研究院 Rolling and rotary forming method for large-taper complex special-shaped ring disc type component
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US20230043008A1 (en) * 2019-12-25 2023-02-09 Hitachi Metals, Ltd. Method of manufacturing ring-rolled element
EP4082684A4 (en) * 2019-12-25 2023-06-14 Proterial, Ltd. Method of manufacturing ring-rolled element
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