CN101279345A - Method for rolling and shaping titanium alloy special-shaped ring forging - Google Patents
Method for rolling and shaping titanium alloy special-shaped ring forging Download PDFInfo
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- CN101279345A CN101279345A CNA2008100687225A CN200810068722A CN101279345A CN 101279345 A CN101279345 A CN 101279345A CN A2008100687225 A CNA2008100687225 A CN A2008100687225A CN 200810068722 A CN200810068722 A CN 200810068722A CN 101279345 A CN101279345 A CN 101279345A
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Abstract
The invention discloses a rolling and shaping method for a titanium alloy heterotypic ring forging in order to obtain the alloy heterotypic ring forgings with excellent tissues and properties as well as realize accurate rolling. The method includes the following steps: alloy bar material is heated, carried out continuous upsetting and deformed by 65 to 70 percent, so as to be made into a solid cake and then is punched again to lead the alloy bar material to be made into a hollow round cake after the aperture dimension of the alloy bar material is 30 to 35 percent of the dimension of the outer diameter thereof; a rectangle ring blank is obtained after the hollow round cake is heated, rolled circularly and deformed by 25 to 30 percent; a rectangle pre-rolling blank is obtained after the rectangle ring blank is heated, rolled circularly and deformed by 25 to 30 percent again; the pre-rolling blank is heated and arranged in a rolling die of a ring rolling machine and becomes a heterotypic ring forging after being rolled and deformed by 40 to 45 percent in a section groove of the die. When in expansion, the broadening speed of the pre-rolling blank along the radial direction is 2mm/s to 15mm/s with a radial rolling force of 40000kg to 220000kg. The method is mainly used for the shaping of the heterotypic ring forging of an aeroengine or a gas turbine. The method can be adopted to obtain the heterotypic ring forging that is arranged in a flow line along the outline of a part.
Description
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 special-shaped ring forging.
Background technology
Adopt the aero-engine of titanium alloy (as material trademarks such as Russian BT20) manufacturing or the forging special-shape ring of ground gas turbine, owing under rugged environment, work for a long time, require forging to have preferable performance and structure stability as parts such as back installation side rings.
On March 2nd, 2005, disclosed Chinese invention patent specification CN 1586754A disclosed a kind of method of section of outer step ring parts rolling forming, the longitudinal cross-section of described ring is a kind of outer step shape of non-rectangle, and promptly described ring belongs to a kind of special shape of forging special-shape ring.This method comprises blanking, base, rolling and following process, and adopting the rolling special-shaped ring of this method is to realize that by the home roll (being driven roller) and the direct pass that forms of core roller of machine for rolling ring the distortion of special-shaped ring is shaped.When adopting the rolling difform special-shaped ring of this technology, need again more roll changing type, and frequent more roll changing type will increase manufacturing cost, extends manufacture cycle and be unfavorable for the maintaining of equipment.
The concrete processing step of above-mentioned ring parts rolling forming method and unexposed rolling titanium alloy special-shaped ring forging, during rolling titanium alloy special-shaped ring forging, expect from alloy bar and finally to be rolled into forging special-shape ring, the deflection of alloy is very big to the tissue and the performance impact of ring rolling spare, its deflection is selected inaccurate, will cause ring rolling spare tissue variation, crystal grain thick, run over and injure, roll defectives such as splitting, easily produce overlap, 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 special-shaped ring forging.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of deflection accurately and realizes the method for titanium alloy special-shaped ring forging at roll off mould internal shaping, adopts the accurate rolling ring of this method to have good tissue and performance.
For solving the problems of the technologies described above, the method for rolling and shaping of titanium alloy special-shaped ring forging 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 65%～70% 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 25%～30%; 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 25%～30%;
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 section groove of roll off mould, described pre-strip plate wall thickness reduce and radially broadening become forging special-shape ring after by roll off distortion 40%～45%.
When adopting the difform forging special-shape ring of said method rolling and shaping, only need the pass of roll off mould is adjusted by the cross sectional shape of ring rolling spare, change corresponding die module and just can.
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 the whole technical process that becomes forging special-shape ring by the titanium alloy bar of specification blanking from jumping-up, punching, the pre-strip plate of system rectangle, to roll off, deflection is shaped forging special-shape ring with use roll off mould by selecting for use accurately, has obtained the forging special-shape ring of even tissue and function admirable.With Russian material trademark is that the wrought titanium alloy of BT20 is an example, the metallographic macrostructure of this alloy forging special-shape ring different parts after testing, metallurgical imperfection such as find no crackle, shrinkage cavity, pore, be mingled with; The metallographic mirco structure of this alloy forging special-shape ring has found no defectives such as coarse-grain, tissue variation, segregation after testing.
The room temperature tensile performance of this alloy forging special-shape ring after testing, its tensile strength is 975MPa～980MPa (greater than the 930MPa of instructions for use), its elongation after fracture be 12%～14% (greater than instructions for use 8%), the contraction percentage of area be 35%～36% (greater than instructions for use 20%); The impact property of this alloy forging special-shape ring after testing, its ballistic work is 47J～67.6J (greater than the 29.4J of instructions for use); The drawing by high temperature enduring quality of this alloy forging special-shape ring after testing, it is in test temperature that 500 ℃, proof stress are 470MPa, disconnected in 51 hours duration (greater than 50 hours of instructions for use); The Brinell hardness of this alloy forging special-shape ring is 333 after testing, requirement up to specification.
From the physics and chemistry testing result of this alloy forging special-shape ring as can be known, adopt this alloy forging special-shape ring of said method rolling and shaping to obtain unforeseeable technique effect, satisfied its instructions for use greatly.
The present invention is also by installing the rolling and shaping that the roll off mould is realized titanium alloy special-shaped ring forging 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 section groove of roll off forging special-shape ring behind core roller die and the home roll mould matched moulds, thereby the forming mode of forging special-shape ring by home roll, core roller and awl roller rolling and shaping are improved to mainly by the mould rolling and shaping, when the forging special-shape ring of roll off different cross section shape, only needing to change the module that forms described section groove on the roll off mould gets final product, and needn't change the home roll of machine for rolling ring, parts such as core roller, thus the manufacturing cost of forging special-shape ring can be reduced, shorten the production cycle and help the maintaining of equipment.And, adopt this method roll off titanium alloy special-shaped ring forging, can obtain to be the forging special-shape ring of streamline distribution, improved the dimensional accuracy of forging special-shape ring along the part profile, thereby can realize accurately rollingly, reduce the machine-finish allowance of forging special-shape ring and the waste of valuable titanium alloy material.
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 pre-strip plate is put into the roll off mould.
Fig. 3 is the process drawing that pre-strip plate roll off becomes forging special-shape ring.
Fig. 4 be roll off technical process shown in Figure 3 overlook the direction schematic diagram.
Fig. 5 is the profilograph of the forging special-shape ring 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 (c) is the metallographic macrostructure figure at c shown in Figure 5 position.
Fig. 7 is the metallographic mirco structure figure at b shown in Figure 5 position.
The specific embodiment
The method for rolling and shaping of implementing titanium alloy special-shaped ring forging of the present invention need provide equipment such as forge furnace, forcing press, machine for rolling ring, manipulator.Be that the wrought titanium alloy of BT20 is the specific embodiment that example describes this method in detail with Russian material trademark below:
The main chemical elements content (percentage by weight) of this alloy is: contain Al amount 5.5%～7.0%, contain Zr amount 1.5%～2.5%, contain Mo amount 0.5%～2.0%, V content 0.8%～2.5%, contain Fe amount≤0.25%, si content≤0.15%, C content≤0.10%, contain N amount≤0.05%, contain O amount≤0.15%, contain H amount≤0.015%, contain other micro-total amount≤0.30%, surplus is Ti.
This alloy is as follows to the processing step of producing qualified forging special-shape ring from bar:
Step 1: the base of the pre-strip plate of rectangle.As shown in Figure 1, BT20 alloy bar 1 by the specification blanking is heated to below the transformation temperature 30 ℃ deformation temperature in forge furnace, jumping-up makes its distortion 65%～70% 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 25%～30% 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 25%～30% 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 roll when ring temperature raise produce the tissue variation, crystal grain is thick and defective such as crackle, thereby help making the finish to gauge forging special-shape ring to obtain favorable tissue and performance.
Step 2: the rolling and shaping of forging special-shape ring:
Put into the roll off mould of forming by home roll mould and core roller die after earlier pre-strip plate 10 being heated to below the transformation temperature 30 ℃ deformation temperature in forge furnace, 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 is fixed on the home roll 13 by home roll cover 20 and home roll key 25 by bottom end cover 19, external form module 17, upper end cover 18, 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 section groove 11 in described, and the longitudinal cross-section of pre-strip plate 10 is in this section groove 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;
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 forging special-shape ring 27 be by the outer shroud of its top c face directly, the outer shroud of the outer shroud arc surface of middle part b and bottom a faces the curved surface that links together by the transition of circular arc nature directly, its inner ring surface is for facing directly.
Detect according to GB/T 5168 " the diphasic titanium alloy high-low time tissue method of inspection ", the metallographic macrostructure of this forging special-shape ring is shown in Fig. 6 (a), 6 (b) and Fig. 6 (c), wherein the sample of Fig. 6 (a), 6 (b) and Fig. 6 (c) is taken from a, b and the c position among Fig. 5 respectively, metallurgical imperfection such as all find no crackle, shrinkage cavity, pore on above-mentioned macrostructure figure, be mingled with; As shown in Figure 7, its sample is taken from the b position among Fig. 5 to the metallographic mirco structure of this forging special-shape ring (microscopically amplify 500 times), 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 forging special-shape ring is 975MPa～980MPa, and elongation after fracture is 12%～14%, and the contraction percentage of area is 35%～36%.
Detect according to GB/T 229 " the metal summer is than nick break test method ", the ballistic work of this alloy forging special-shape ring is 47J～67.6J.
Detect this special-shaped ring forgeable according to GB6395 " metallic high temperature stretching duration running method ". part test temperature be 500 ℃, proof stress be 470MPa, disconnected in 51 hours duration.
Detect according to GB/T231 " metal Brinell hardness test method ", the Brinell hardness of this forging special-shape ring is 333.
Above-mentioned physics and chemistry testing result shows, adopts the BT20 forging special-shape ring 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.
Adopt the forging special-shape ring of method rolling and shaping provided by the invention to be not limited to above-mentioned embodiment, for difform forging special-shape ring, only need to change the interior pattern piece 16 of roll off mould and the outer peripheral face shape of external form module 17, but according to the method described above just roll off go out the forging special-shape ring of different cross section shape.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 (4)
1, a kind of method for rolling and shaping of titanium alloy special-shaped ring forging 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 65%～70% 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 25%～30%; 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 25%～30%;
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 section groove of roll off mould, described pre-strip plate wall thickness reduce and radially broadening become forging special-shape ring after by roll off distortion 40%～45%.
2, according to the described method for rolling and shaping of claim 1, it is characterized in that: the section groove of described roll off mould is to adjust according to the cross sectional shape of ring rolling spare.
3, 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.
4, 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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Assignee: Guiyang Daewoo Aviation Materials Engineering Co., Ltd. Assignor: Anda Aviation Forging Co., Ltd., Guizhou Contract record no.: 2012520000005 Denomination of invention: Method for rolling and shaping titanium alloy special-shaped ring forging Granted publication date: 20100127 License type: Exclusive License Open date: 20081008 Record date: 20120228 |